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     <a href="/community/">Community</a>&ensp;·&ensp;
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     <a href="/community/">Community</a>&ensp;·&ensp;
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index 8eb6416..23b47ba 100644
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     <a href="/community/">Community</a>&ensp;·&ensp;
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diff --git a/blog/2014/05/07/open-source-leaders-sound-off-on-the-rise-of-the-real-time-data-stack.html b/blog/2014/05/07/open-source-leaders-sound-off-on-the-rise-of-the-real-time-data-stack.html
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     <a href="/community/">Community</a>&ensp;·&ensp;
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     <a href="/community/">Community</a>&ensp;·&ensp;
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diff --git a/blog/2015/02/20/towards-a-community-led-druid.html b/blog/2015/02/20/towards-a-community-led-druid.html
index 3520d52..bb9bc4b 100644
--- a/blog/2015/02/20/towards-a-community-led-druid.html
+++ b/blog/2015/02/20/towards-a-community-led-druid.html
@@ -172,7 +172,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/blog/2015/11/03/seeking-new-committers.html b/blog/2015/11/03/seeking-new-committers.html
index 93a137d..3fe8cba 100644
--- a/blog/2015/11/03/seeking-new-committers.html
+++ b/blog/2015/11/03/seeking-new-committers.html
@@ -179,7 +179,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/blog/2016/01/06/announcing-new-committers.html b/blog/2016/01/06/announcing-new-committers.html
index d0b51b8..8dec79c 100644
--- a/blog/2016/01/06/announcing-new-committers.html
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@@ -166,7 +166,7 @@
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     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/blog/2016/06/28/druid-0-9-1.html b/blog/2016/06/28/druid-0-9-1.html
index 50ab708..9fdeafe 100644
--- a/blog/2016/06/28/druid-0-9-1.html
+++ b/blog/2016/06/28/druid-0-9-1.html
@@ -159,7 +159,7 @@
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     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/blog/2016/12/01/druid-0-9-2.html b/blog/2016/12/01/druid-0-9-2.html
index a572c70..901be86 100644
--- a/blog/2016/12/01/druid-0-9-2.html
+++ b/blog/2016/12/01/druid-0-9-2.html
@@ -162,7 +162,7 @@
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     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/blog/2017/04/18/druid-0-10-0.html b/blog/2017/04/18/druid-0-10-0.html
index dcb072c..df7d386 100644
--- a/blog/2017/04/18/druid-0-10-0.html
+++ b/blog/2017/04/18/druid-0-10-0.html
@@ -164,7 +164,7 @@
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     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/blog/2017/08/22/druid-0-10-1.html b/blog/2017/08/22/druid-0-10-1.html
index 85eed69..e88e033 100644
--- a/blog/2017/08/22/druid-0-10-1.html
+++ b/blog/2017/08/22/druid-0-10-1.html
@@ -173,7 +173,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/blog/2017/12/04/druid-0-11-0.html b/blog/2017/12/04/druid-0-11-0.html
index 394caa3..2f00b86 100644
--- a/blog/2017/12/04/druid-0-11-0.html
+++ b/blog/2017/12/04/druid-0-11-0.html
@@ -172,7 +172,7 @@
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     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/blog/2018/03/08/druid-0-12-0.html b/blog/2018/03/08/druid-0-12-0.html
index a962779..3094e99 100644
--- a/blog/2018/03/08/druid-0-12-0.html
+++ b/blog/2018/03/08/druid-0-12-0.html
@@ -174,7 +174,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/blog/2018/06/08/druid-0-12-1.html b/blog/2018/06/08/druid-0-12-1.html
index c75314f..3cf4ba7 100644
--- a/blog/2018/06/08/druid-0-12-1.html
+++ b/blog/2018/06/08/druid-0-12-1.html
@@ -171,7 +171,7 @@
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     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/blog/index.html b/blog/index.html
index 70a3f66..8eb7cc4 100644
--- a/blog/index.html
+++ b/blog/index.html
@@ -513,7 +513,7 @@
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     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/community/cla.html b/community/cla.html
index ad2e4fc..14cf86e 100644
--- a/community/cla.html
+++ b/community/cla.html
@@ -144,7 +144,7 @@
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     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/community/index.html b/community/index.html
index b76f71b..685a0d1 100644
--- a/community/index.html
+++ b/community/index.html
@@ -425,7 +425,7 @@
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     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/css/base.css b/css/base.css
deleted file mode 100644
index 940e77a..0000000
--- a/css/base.css
+++ /dev/null
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diff --git a/css/blogs.css b/css/blogs.css
deleted file mode 100644
index 081b39e..0000000
--- a/css/blogs.css
+++ /dev/null
@@ -1,68 +0,0 @@
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diff --git a/css/bootstrap-pure.css b/css/bootstrap-pure.css
deleted file mode 100644
index 820c985..0000000
--- a/css/bootstrap-pure.css
+++ /dev/null
@@ -1,1855 +0,0 @@
-/*!
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- * Copyright 2011-2015 Twitter, Inc.
- * Licensed under MIT (https://github.com/twbs/bootstrap/blob/master/LICENSE)
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diff --git a/css/docs.css b/css/docs.css
deleted file mode 100644
index 1bea588..0000000
--- a/css/docs.css
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diff --git a/css/footer.css b/css/footer.css
deleted file mode 100644
index 2149437..0000000
--- a/css/footer.css
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diff --git a/css/header.css b/css/header.css
deleted file mode 100644
index 0fb02ec..0000000
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diff --git a/css/news-list.css b/css/news-list.css
deleted file mode 100644
index dfea42e..0000000
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diff --git a/css/reset.css b/css/reset.css
deleted file mode 100644
index 6d44268..0000000
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+++ /dev/null
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diff --git a/css/syntax.css b/css/syntax.css
deleted file mode 100644
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diff --git a/css/variables.css b/css/variables.css
deleted file mode 100644
index e69de29..0000000
--- a/css/variables.css
+++ /dev/null
diff --git a/docs/0.13.0-incubating/comparisons/druid-vs-elasticsearch.html b/docs/0.13.0-incubating/comparisons/druid-vs-elasticsearch.html
index 9a10895..d592ba8 100644
--- a/docs/0.13.0-incubating/comparisons/druid-vs-elasticsearch.html
+++ b/docs/0.13.0-incubating/comparisons/druid-vs-elasticsearch.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -184,7 +184,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.13.0-incubating/comparisons/druid-vs-key-value.html b/docs/0.13.0-incubating/comparisons/druid-vs-key-value.html
index 563ba82..00565cd 100644
--- a/docs/0.13.0-incubating/comparisons/druid-vs-key-value.html
+++ b/docs/0.13.0-incubating/comparisons/druid-vs-key-value.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -193,7 +193,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.13.0-incubating/comparisons/druid-vs-kudu.html b/docs/0.13.0-incubating/comparisons/druid-vs-kudu.html
index 69befb8..d5e25bb 100644
--- a/docs/0.13.0-incubating/comparisons/druid-vs-kudu.html
+++ b/docs/0.13.0-incubating/comparisons/druid-vs-kudu.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -184,7 +184,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.13.0-incubating/comparisons/druid-vs-redshift.html b/docs/0.13.0-incubating/comparisons/druid-vs-redshift.html
index 2cadf79..c6916a0 100644
--- a/docs/0.13.0-incubating/comparisons/druid-vs-redshift.html
+++ b/docs/0.13.0-incubating/comparisons/druid-vs-redshift.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -209,7 +209,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.13.0-incubating/comparisons/druid-vs-spark.html b/docs/0.13.0-incubating/comparisons/druid-vs-spark.html
index 36586f7..4488cd1 100644
--- a/docs/0.13.0-incubating/comparisons/druid-vs-spark.html
+++ b/docs/0.13.0-incubating/comparisons/druid-vs-spark.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -187,7 +187,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.13.0-incubating/comparisons/druid-vs-sql-on-hadoop.html b/docs/0.13.0-incubating/comparisons/druid-vs-sql-on-hadoop.html
index 9f09298..1b335fb 100644
--- a/docs/0.13.0-incubating/comparisons/druid-vs-sql-on-hadoop.html
+++ b/docs/0.13.0-incubating/comparisons/druid-vs-sql-on-hadoop.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -231,7 +231,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.13.0-incubating/configuration/index.html b/docs/0.13.0-incubating/configuration/index.html
index 58ae525..6d368c3 100644
--- a/docs/0.13.0-incubating/configuration/index.html
+++ b/docs/0.13.0-incubating/configuration/index.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -4175,7 +4175,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.13.0-incubating/configuration/logging.html b/docs/0.13.0-incubating/configuration/logging.html
index cf0ca8c..6e1c521 100644
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
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-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
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index 03dc52e..4c0051d 100644
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-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.13.0-incubating/dependencies/cassandra-deep-storage.html b/docs/0.13.0-incubating/dependencies/cassandra-deep-storage.html
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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@@ -202,7 +202,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
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diff --git a/docs/0.13.0-incubating/dependencies/deep-storage.html b/docs/0.13.0-incubating/dependencies/deep-storage.html
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
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diff --git a/docs/0.13.0-incubating/dependencies/metadata-storage.html b/docs/0.13.0-incubating/dependencies/metadata-storage.html
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
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diff --git a/docs/0.13.0-incubating/design/auth.html b/docs/0.13.0-incubating/design/auth.html
index 1fcb778..514b802 100644
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
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diff --git a/docs/0.13.0-incubating/design/broker.html b/docs/0.13.0-incubating/design/broker.html
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
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diff --git a/docs/0.13.0-incubating/design/coordinator.html b/docs/0.13.0-incubating/design/coordinator.html
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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@@ -272,7 +272,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
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diff --git a/docs/0.13.0-incubating/design/historical.html b/docs/0.13.0-incubating/design/historical.html
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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@@ -200,7 +200,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.13.0-incubating/design/index.html b/docs/0.13.0-incubating/design/index.html
index 4871977..90c6a49 100644
--- a/docs/0.13.0-incubating/design/index.html
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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@@ -378,7 +378,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.13.0-incubating/design/indexing-service.html b/docs/0.13.0-incubating/design/indexing-service.html
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.13.0-incubating/design/middlemanager.html b/docs/0.13.0-incubating/design/middlemanager.html
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.13.0-incubating/design/overlord.html b/docs/0.13.0-incubating/design/overlord.html
index 1f27eb1..c34b346 100644
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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@@ -205,7 +205,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.13.0-incubating/design/peons.html b/docs/0.13.0-incubating/design/peons.html
index dbcd7b0..bd2bcae 100644
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.13.0-incubating/design/plumber.html b/docs/0.13.0-incubating/design/plumber.html
index 137fdf2..fe1ba86 100644
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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@@ -181,7 +181,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.13.0-incubating/design/realtime.html b/docs/0.13.0-incubating/design/realtime.html
index c82bb5e..a0947c5 100644
--- a/docs/0.13.0-incubating/design/realtime.html
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.13.0-incubating/design/segments.html b/docs/0.13.0-incubating/design/segments.html
index 5dc5941..2314d39 100644
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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@@ -343,7 +343,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.13.0-incubating/development/build.html b/docs/0.13.0-incubating/development/build.html
index 2334dc2..5270cfb 100644
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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@@ -204,7 +204,7 @@
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     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.13.0-incubating/development/experimental.html b/docs/0.13.0-incubating/development/experimental.html
index b6b8f5d..b591cf4 100644
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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@@ -180,7 +180,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.13.0-incubating/development/extensions-contrib/ambari-metrics-emitter.html b/docs/0.13.0-incubating/development/extensions-contrib/ambari-metrics-emitter.html
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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@@ -308,7 +308,7 @@
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     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.13.0-incubating/development/extensions-contrib/azure.html b/docs/0.13.0-incubating/development/extensions-contrib/azure.html
index 768149c..e001f27 100644
--- a/docs/0.13.0-incubating/development/extensions-contrib/azure.html
+++ b/docs/0.13.0-incubating/development/extensions-contrib/azure.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -332,7 +332,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.13.0-incubating/development/extensions-contrib/cassandra.html b/docs/0.13.0-incubating/development/extensions-contrib/cassandra.html
index da3b4b0..7a9f599 100644
--- a/docs/0.13.0-incubating/development/extensions-contrib/cassandra.html
+++ b/docs/0.13.0-incubating/development/extensions-contrib/cassandra.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -175,7 +175,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.13.0-incubating/development/extensions-contrib/cloudfiles.html b/docs/0.13.0-incubating/development/extensions-contrib/cloudfiles.html
index 4786cfa..12a0444 100644
--- a/docs/0.13.0-incubating/development/extensions-contrib/cloudfiles.html
+++ b/docs/0.13.0-incubating/development/extensions-contrib/cloudfiles.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -348,7 +348,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.13.0-incubating/development/extensions-contrib/distinctcount.html b/docs/0.13.0-incubating/development/extensions-contrib/distinctcount.html
index 2a7d17d..11b485a 100644
--- a/docs/0.13.0-incubating/development/extensions-contrib/distinctcount.html
+++ b/docs/0.13.0-incubating/development/extensions-contrib/distinctcount.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -235,7 +235,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.13.0-incubating/development/extensions-contrib/google.html b/docs/0.13.0-incubating/development/extensions-contrib/google.html
index c5cba09..4dea988 100644
--- a/docs/0.13.0-incubating/development/extensions-contrib/google.html
+++ b/docs/0.13.0-incubating/development/extensions-contrib/google.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -310,7 +310,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.13.0-incubating/development/extensions-contrib/graphite.html b/docs/0.13.0-incubating/development/extensions-contrib/graphite.html
index f292be7..5628dd9 100644
--- a/docs/0.13.0-incubating/development/extensions-contrib/graphite.html
+++ b/docs/0.13.0-incubating/development/extensions-contrib/graphite.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -315,7 +315,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.13.0-incubating/development/extensions-contrib/influx.html b/docs/0.13.0-incubating/development/extensions-contrib/influx.html
index 3106bca..bd324e5 100644
--- a/docs/0.13.0-incubating/development/extensions-contrib/influx.html
+++ b/docs/0.13.0-incubating/development/extensions-contrib/influx.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -210,7 +210,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.13.0-incubating/development/extensions-contrib/kafka-emitter.html b/docs/0.13.0-incubating/development/extensions-contrib/kafka-emitter.html
index 879d27d..82f50ce 100644
--- a/docs/0.13.0-incubating/development/extensions-contrib/kafka-emitter.html
+++ b/docs/0.13.0-incubating/development/extensions-contrib/kafka-emitter.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -228,7 +228,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.13.0-incubating/development/extensions-contrib/kafka-simple.html b/docs/0.13.0-incubating/development/extensions-contrib/kafka-simple.html
index 5e0b301..b51715f 100644
--- a/docs/0.13.0-incubating/development/extensions-contrib/kafka-simple.html
+++ b/docs/0.13.0-incubating/development/extensions-contrib/kafka-simple.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -231,7 +231,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.13.0-incubating/development/extensions-contrib/materialized-view.html b/docs/0.13.0-incubating/development/extensions-contrib/materialized-view.html
index c17aec5..370c3b4 100644
--- a/docs/0.13.0-incubating/development/extensions-contrib/materialized-view.html
+++ b/docs/0.13.0-incubating/development/extensions-contrib/materialized-view.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -345,7 +345,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.13.0-incubating/development/extensions-contrib/opentsdb-emitter.html b/docs/0.13.0-incubating/development/extensions-contrib/opentsdb-emitter.html
index 22ea74a..b4c9eea 100644
--- a/docs/0.13.0-incubating/development/extensions-contrib/opentsdb-emitter.html
+++ b/docs/0.13.0-incubating/development/extensions-contrib/opentsdb-emitter.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -250,7 +250,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.13.0-incubating/development/extensions-contrib/orc.html b/docs/0.13.0-incubating/development/extensions-contrib/orc.html
index d08838f..0d7a842 100644
--- a/docs/0.13.0-incubating/development/extensions-contrib/orc.html
+++ b/docs/0.13.0-incubating/development/extensions-contrib/orc.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -281,7 +281,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.13.0-incubating/development/extensions-contrib/parquet.html b/docs/0.13.0-incubating/development/extensions-contrib/parquet.html
index 0877c27..3952cb6 100644
--- a/docs/0.13.0-incubating/development/extensions-contrib/parquet.html
+++ b/docs/0.13.0-incubating/development/extensions-contrib/parquet.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -336,7 +336,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.13.0-incubating/development/extensions-contrib/rabbitmq.html b/docs/0.13.0-incubating/development/extensions-contrib/rabbitmq.html
index d6a197b..b8526c5 100644
--- a/docs/0.13.0-incubating/development/extensions-contrib/rabbitmq.html
+++ b/docs/0.13.0-incubating/development/extensions-contrib/rabbitmq.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -309,7 +309,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.13.0-incubating/development/extensions-contrib/redis-cache.html b/docs/0.13.0-incubating/development/extensions-contrib/redis-cache.html
index a0a1c85..8cca7df 100644
--- a/docs/0.13.0-incubating/development/extensions-contrib/redis-cache.html
+++ b/docs/0.13.0-incubating/development/extensions-contrib/redis-cache.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -253,7 +253,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.13.0-incubating/development/extensions-contrib/rocketmq.html b/docs/0.13.0-incubating/development/extensions-contrib/rocketmq.html
index a887dc0..2c601f5 100644
--- a/docs/0.13.0-incubating/development/extensions-contrib/rocketmq.html
+++ b/docs/0.13.0-incubating/development/extensions-contrib/rocketmq.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -173,7 +173,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.13.0-incubating/development/extensions-contrib/sqlserver.html b/docs/0.13.0-incubating/development/extensions-contrib/sqlserver.html
index db6c7b2..de06e29 100644
--- a/docs/0.13.0-incubating/development/extensions-contrib/sqlserver.html
+++ b/docs/0.13.0-incubating/development/extensions-contrib/sqlserver.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -203,7 +203,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.13.0-incubating/development/extensions-contrib/statsd.html b/docs/0.13.0-incubating/development/extensions-contrib/statsd.html
index 94e2fae..9f0a6a8 100644
--- a/docs/0.13.0-incubating/development/extensions-contrib/statsd.html
+++ b/docs/0.13.0-incubating/development/extensions-contrib/statsd.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -254,7 +254,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.13.0-incubating/development/extensions-contrib/thrift.html b/docs/0.13.0-incubating/development/extensions-contrib/thrift.html
index 344b845..40e0a7f 100644
--- a/docs/0.13.0-incubating/development/extensions-contrib/thrift.html
+++ b/docs/0.13.0-incubating/development/extensions-contrib/thrift.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -288,7 +288,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.13.0-incubating/development/extensions-contrib/time-min-max.html b/docs/0.13.0-incubating/development/extensions-contrib/time-min-max.html
index 235e70b..7cd2d39 100644
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+++ b/docs/0.13.0-incubating/development/extensions-contrib/time-min-max.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -234,7 +234,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.13.0-incubating/development/extensions-core/approximate-histograms.html b/docs/0.13.0-incubating/development/extensions-core/approximate-histograms.html
index 220ef75..84c0624 100644
--- a/docs/0.13.0-incubating/development/extensions-core/approximate-histograms.html
+++ b/docs/0.13.0-incubating/development/extensions-core/approximate-histograms.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -314,7 +314,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.13.0-incubating/development/extensions-core/avro.html b/docs/0.13.0-incubating/development/extensions-core/avro.html
index f8f39e3..d476fff 100644
--- a/docs/0.13.0-incubating/development/extensions-core/avro.html
+++ b/docs/0.13.0-incubating/development/extensions-core/avro.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -474,7 +474,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.13.0-incubating/development/extensions-core/bloom-filter.html b/docs/0.13.0-incubating/development/extensions-core/bloom-filter.html
index 9a56060..bdb2e2c 100644
--- a/docs/0.13.0-incubating/development/extensions-core/bloom-filter.html
+++ b/docs/0.13.0-incubating/development/extensions-core/bloom-filter.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -229,7 +229,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.13.0-incubating/development/extensions-core/datasketches-extension.html b/docs/0.13.0-incubating/development/extensions-core/datasketches-extension.html
index 07c1a2d..048b51d 100644
--- a/docs/0.13.0-incubating/development/extensions-core/datasketches-extension.html
+++ b/docs/0.13.0-incubating/development/extensions-core/datasketches-extension.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -183,7 +183,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.13.0-incubating/development/extensions-core/datasketches-hll.html b/docs/0.13.0-incubating/development/extensions-core/datasketches-hll.html
index 748c2dc..01eeebf 100644
--- a/docs/0.13.0-incubating/development/extensions-core/datasketches-hll.html
+++ b/docs/0.13.0-incubating/development/extensions-core/datasketches-hll.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -253,7 +253,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.13.0-incubating/development/extensions-core/datasketches-quantiles.html b/docs/0.13.0-incubating/development/extensions-core/datasketches-quantiles.html
index ef8f40a..3a144a5 100644
--- a/docs/0.13.0-incubating/development/extensions-core/datasketches-quantiles.html
+++ b/docs/0.13.0-incubating/development/extensions-core/datasketches-quantiles.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -262,7 +262,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.13.0-incubating/development/extensions-core/datasketches-theta.html b/docs/0.13.0-incubating/development/extensions-core/datasketches-theta.html
index 85cca53..70ae784 100644
--- a/docs/0.13.0-incubating/development/extensions-core/datasketches-theta.html
+++ b/docs/0.13.0-incubating/development/extensions-core/datasketches-theta.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -416,7 +416,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.13.0-incubating/development/extensions-core/datasketches-tuple.html b/docs/0.13.0-incubating/development/extensions-core/datasketches-tuple.html
index 2ab82e5..fd90bb5 100644
--- a/docs/0.13.0-incubating/development/extensions-core/datasketches-tuple.html
+++ b/docs/0.13.0-incubating/development/extensions-core/datasketches-tuple.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -318,7 +318,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.13.0-incubating/development/extensions-core/druid-basic-security.html b/docs/0.13.0-incubating/development/extensions-core/druid-basic-security.html
index 663adcf..c9f81c8 100644
--- a/docs/0.13.0-incubating/development/extensions-core/druid-basic-security.html
+++ b/docs/0.13.0-incubating/development/extensions-core/druid-basic-security.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -660,7 +660,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.13.0-incubating/development/extensions-core/druid-kerberos.html b/docs/0.13.0-incubating/development/extensions-core/druid-kerberos.html
index b58adc0..e6f2d97 100644
--- a/docs/0.13.0-incubating/development/extensions-core/druid-kerberos.html
+++ b/docs/0.13.0-incubating/development/extensions-core/druid-kerberos.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -347,7 +347,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.13.0-incubating/development/extensions-core/druid-lookups.html b/docs/0.13.0-incubating/development/extensions-core/druid-lookups.html
index ed25b31..861546f 100644
--- a/docs/0.13.0-incubating/development/extensions-core/druid-lookups.html
+++ b/docs/0.13.0-incubating/development/extensions-core/druid-lookups.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -407,7 +407,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.13.0-incubating/development/extensions-core/examples.html b/docs/0.13.0-incubating/development/extensions-core/examples.html
index 60510cc..128accd 100644
--- a/docs/0.13.0-incubating/development/extensions-core/examples.html
+++ b/docs/0.13.0-incubating/development/extensions-core/examples.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -208,7 +208,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.13.0-incubating/development/extensions-core/hdfs.html b/docs/0.13.0-incubating/development/extensions-core/hdfs.html
index a27f6f7..beecd43 100644
--- a/docs/0.13.0-incubating/development/extensions-core/hdfs.html
+++ b/docs/0.13.0-incubating/development/extensions-core/hdfs.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -244,7 +244,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.13.0-incubating/development/extensions-core/kafka-eight-firehose.html b/docs/0.13.0-incubating/development/extensions-core/kafka-eight-firehose.html
index 4a9487e..1ad9d21 100644
--- a/docs/0.13.0-incubating/development/extensions-core/kafka-eight-firehose.html
+++ b/docs/0.13.0-incubating/development/extensions-core/kafka-eight-firehose.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -213,7 +213,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.13.0-incubating/development/extensions-core/kafka-extraction-namespace.html b/docs/0.13.0-incubating/development/extensions-core/kafka-extraction-namespace.html
index ae73974..4481e2b 100644
--- a/docs/0.13.0-incubating/development/extensions-core/kafka-extraction-namespace.html
+++ b/docs/0.13.0-incubating/development/extensions-core/kafka-extraction-namespace.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -235,7 +235,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.13.0-incubating/development/extensions-core/kafka-ingestion.html b/docs/0.13.0-incubating/development/extensions-core/kafka-ingestion.html
index 32927c7..bcd96ee 100644
--- a/docs/0.13.0-incubating/development/extensions-core/kafka-ingestion.html
+++ b/docs/0.13.0-incubating/development/extensions-core/kafka-ingestion.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -807,7 +807,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.13.0-incubating/development/extensions-core/lookups-cached-global.html b/docs/0.13.0-incubating/development/extensions-core/lookups-cached-global.html
index 55206ac..6275e92 100644
--- a/docs/0.13.0-incubating/development/extensions-core/lookups-cached-global.html
+++ b/docs/0.13.0-incubating/development/extensions-core/lookups-cached-global.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -691,7 +691,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.13.0-incubating/development/extensions-core/mysql.html b/docs/0.13.0-incubating/development/extensions-core/mysql.html
index fed4ae8..2161aab 100644
--- a/docs/0.13.0-incubating/development/extensions-core/mysql.html
+++ b/docs/0.13.0-incubating/development/extensions-core/mysql.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -307,7 +307,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.13.0-incubating/development/extensions-core/postgresql.html b/docs/0.13.0-incubating/development/extensions-core/postgresql.html
index 4da045f..7fdf89c 100644
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+++ b/docs/0.13.0-incubating/development/extensions-core/postgresql.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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@@ -284,7 +284,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.13.0-incubating/development/extensions-core/protobuf.html b/docs/0.13.0-incubating/development/extensions-core/protobuf.html
index 00b7b65..b612329 100644
--- a/docs/0.13.0-incubating/development/extensions-core/protobuf.html
+++ b/docs/0.13.0-incubating/development/extensions-core/protobuf.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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@@ -384,7 +384,7 @@
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     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.13.0-incubating/development/extensions-core/s3.html b/docs/0.13.0-incubating/development/extensions-core/s3.html
index 47877f8..ea06e2d 100644
--- a/docs/0.13.0-incubating/development/extensions-core/s3.html
+++ b/docs/0.13.0-incubating/development/extensions-core/s3.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -359,7 +359,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.13.0-incubating/development/extensions-core/simple-client-sslcontext.html b/docs/0.13.0-incubating/development/extensions-core/simple-client-sslcontext.html
index d986800..05f13f2 100644
--- a/docs/0.13.0-incubating/development/extensions-core/simple-client-sslcontext.html
+++ b/docs/0.13.0-incubating/development/extensions-core/simple-client-sslcontext.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -266,7 +266,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.13.0-incubating/development/extensions-core/stats.html b/docs/0.13.0-incubating/development/extensions-core/stats.html
index 1e0d35c..22a8785 100644
--- a/docs/0.13.0-incubating/development/extensions-core/stats.html
+++ b/docs/0.13.0-incubating/development/extensions-core/stats.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -307,7 +307,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.13.0-incubating/development/extensions-core/test-stats.html b/docs/0.13.0-incubating/development/extensions-core/test-stats.html
index 1acace2..7fbc33f 100644
--- a/docs/0.13.0-incubating/development/extensions-core/test-stats.html
+++ b/docs/0.13.0-incubating/development/extensions-core/test-stats.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -259,7 +259,7 @@
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     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.13.0-incubating/development/extensions.html b/docs/0.13.0-incubating/development/extensions.html
index 8fc82fb..97b146c 100644
--- a/docs/0.13.0-incubating/development/extensions.html
+++ b/docs/0.13.0-incubating/development/extensions.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -412,7 +412,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.13.0-incubating/development/geo.html b/docs/0.13.0-incubating/development/geo.html
index 4f4e5c5..f927862 100644
--- a/docs/0.13.0-incubating/development/geo.html
+++ b/docs/0.13.0-incubating/development/geo.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -274,7 +274,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.13.0-incubating/development/integrating-druid-with-other-technologies.html b/docs/0.13.0-incubating/development/integrating-druid-with-other-technologies.html
index 6be75c2..29aa20b 100644
--- a/docs/0.13.0-incubating/development/integrating-druid-with-other-technologies.html
+++ b/docs/0.13.0-incubating/development/integrating-druid-with-other-technologies.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -183,7 +183,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.13.0-incubating/development/javascript.html b/docs/0.13.0-incubating/development/javascript.html
index 73593c4..cc5ebad 100644
--- a/docs/0.13.0-incubating/development/javascript.html
+++ b/docs/0.13.0-incubating/development/javascript.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -221,7 +221,7 @@
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     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.13.0-incubating/development/modules.html b/docs/0.13.0-incubating/development/modules.html
index 79d9f83..dfcec2c 100644
--- a/docs/0.13.0-incubating/development/modules.html
+++ b/docs/0.13.0-incubating/development/modules.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -410,7 +410,7 @@
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     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.13.0-incubating/development/overview.html b/docs/0.13.0-incubating/development/overview.html
index b3231a6..d289b96 100644
--- a/docs/0.13.0-incubating/development/overview.html
+++ b/docs/0.13.0-incubating/development/overview.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -220,7 +220,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.13.0-incubating/development/router.html b/docs/0.13.0-incubating/development/router.html
index 3ba2737..df46f0c 100644
--- a/docs/0.13.0-incubating/development/router.html
+++ b/docs/0.13.0-incubating/development/router.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -439,7 +439,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.13.0-incubating/development/versioning.html b/docs/0.13.0-incubating/development/versioning.html
index 982cf67..5e2782f 100644
--- a/docs/0.13.0-incubating/development/versioning.html
+++ b/docs/0.13.0-incubating/development/versioning.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -191,7 +191,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.13.0-incubating/ingestion/batch-ingestion.html b/docs/0.13.0-incubating/ingestion/batch-ingestion.html
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--- a/docs/0.13.0-incubating/ingestion/batch-ingestion.html
+++ b/docs/0.13.0-incubating/ingestion/batch-ingestion.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -183,7 +183,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.13.0-incubating/ingestion/command-line-hadoop-indexer.html b/docs/0.13.0-incubating/ingestion/command-line-hadoop-indexer.html
index 9deabdf..cbff815 100644
--- a/docs/0.13.0-incubating/ingestion/command-line-hadoop-indexer.html
+++ b/docs/0.13.0-incubating/ingestion/command-line-hadoop-indexer.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -288,7 +288,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.13.0-incubating/ingestion/compaction.html b/docs/0.13.0-incubating/ingestion/compaction.html
index d7efe10..426fa34 100644
--- a/docs/0.13.0-incubating/ingestion/compaction.html
+++ b/docs/0.13.0-incubating/ingestion/compaction.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -270,7 +270,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.13.0-incubating/ingestion/data-formats.html b/docs/0.13.0-incubating/ingestion/data-formats.html
index 9d8ca0e..86660b4 100644
--- a/docs/0.13.0-incubating/ingestion/data-formats.html
+++ b/docs/0.13.0-incubating/ingestion/data-formats.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -325,7 +325,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.13.0-incubating/ingestion/delete-data.html b/docs/0.13.0-incubating/ingestion/delete-data.html
index c25a9ec..95ec8be 100644
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -193,7 +193,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.13.0-incubating/ingestion/faq.html b/docs/0.13.0-incubating/ingestion/faq.html
index 84309b6..0dbad38 100644
--- a/docs/0.13.0-incubating/ingestion/faq.html
+++ b/docs/0.13.0-incubating/ingestion/faq.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -247,7 +247,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.13.0-incubating/ingestion/firehose.html b/docs/0.13.0-incubating/ingestion/firehose.html
index 33760cf..57139ef 100644
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+++ b/docs/0.13.0-incubating/ingestion/firehose.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -519,7 +519,7 @@
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     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
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-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
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-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
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-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
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-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
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-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
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-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
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-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
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-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
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@@ -121,7 +121,7 @@
       
 
       
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-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
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diff --git a/docs/0.13.0-incubating/ingestion/reports.html b/docs/0.13.0-incubating/ingestion/reports.html
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-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
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-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
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-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
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-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
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-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
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     <a href="/faq">FAQ</a>
diff --git a/docs/0.13.0-incubating/ingestion/stream-pull.html b/docs/0.13.0-incubating/ingestion/stream-pull.html
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
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-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
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-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
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diff --git a/docs/0.13.0-incubating/ingestion/tasks.html b/docs/0.13.0-incubating/ingestion/tasks.html
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-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
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-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
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     <a href="/faq">FAQ</a>
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-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
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-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.13.0-incubating/ingestion/update-existing-data.html b/docs/0.13.0-incubating/ingestion/update-existing-data.html
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-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
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-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
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diff --git a/docs/0.13.0-incubating/misc/math-expr.html b/docs/0.13.0-incubating/misc/math-expr.html
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-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
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-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
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     <a href="/faq">FAQ</a>
diff --git a/docs/0.13.0-incubating/misc/papers-and-talks.html b/docs/0.13.0-incubating/misc/papers-and-talks.html
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-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
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-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
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diff --git a/docs/0.13.0-incubating/operations/alerts.html b/docs/0.13.0-incubating/operations/alerts.html
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-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
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-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
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-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
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-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.13.0-incubating/operations/dump-segment.html b/docs/0.13.0-incubating/operations/dump-segment.html
index 6f363d1..8d4db28 100644
--- a/docs/0.13.0-incubating/operations/dump-segment.html
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-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.13.0-incubating/operations/http-compression.html b/docs/0.13.0-incubating/operations/http-compression.html
index 47e643d..a12c978 100644
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.13.0-incubating/operations/including-extensions.html b/docs/0.13.0-incubating/operations/including-extensions.html
index eeb90d6..34b3418 100644
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.13.0-incubating/operations/insert-segment-to-db.html b/docs/0.13.0-incubating/operations/insert-segment-to-db.html
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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@@ -285,7 +285,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.13.0-incubating/operations/metrics.html b/docs/0.13.0-incubating/operations/metrics.html
index 2674aac..303583d 100644
--- a/docs/0.13.0-incubating/operations/metrics.html
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.13.0-incubating/operations/other-hadoop.html b/docs/0.13.0-incubating/operations/other-hadoop.html
index 2047258..e3ffe87 100644
--- a/docs/0.13.0-incubating/operations/other-hadoop.html
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.13.0-incubating/operations/password-provider.html b/docs/0.13.0-incubating/operations/password-provider.html
index 549f37a..07a26f9 100644
--- a/docs/0.13.0-incubating/operations/password-provider.html
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -210,7 +210,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.13.0-incubating/operations/performance-faq.html b/docs/0.13.0-incubating/operations/performance-faq.html
index a0819cc..ef11ade 100644
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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@@ -240,7 +240,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.13.0-incubating/operations/pull-deps.html b/docs/0.13.0-incubating/operations/pull-deps.html
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -283,7 +283,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.13.0-incubating/operations/recommendations.html b/docs/0.13.0-incubating/operations/recommendations.html
index fc63273..28a0e82 100644
--- a/docs/0.13.0-incubating/operations/recommendations.html
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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@@ -235,7 +235,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.13.0-incubating/operations/reset-cluster.html b/docs/0.13.0-incubating/operations/reset-cluster.html
index c9269b4..d023b9b 100644
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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@@ -209,7 +209,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.13.0-incubating/operations/rolling-updates.html b/docs/0.13.0-incubating/operations/rolling-updates.html
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.13.0-incubating/operations/rule-configuration.html b/docs/0.13.0-incubating/operations/rule-configuration.html
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.13.0-incubating/operations/segment-optimization.html b/docs/0.13.0-incubating/operations/segment-optimization.html
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.13.0-incubating/operations/tls-support.html b/docs/0.13.0-incubating/operations/tls-support.html
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -356,7 +356,7 @@
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     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.13.0-incubating/operations/use_sbt_to_build_fat_jar.html b/docs/0.13.0-incubating/operations/use_sbt_to_build_fat_jar.html
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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@@ -269,7 +269,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.13.0-incubating/querying/aggregations.html b/docs/0.13.0-incubating/querying/aggregations.html
index a6f011c..4187414 100644
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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@@ -466,7 +466,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.13.0-incubating/querying/caching.html b/docs/0.13.0-incubating/querying/caching.html
index 158d25f..f1169c0 100644
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.13.0-incubating/querying/datasource.html b/docs/0.13.0-incubating/querying/datasource.html
index a3c3a64..61ef326 100644
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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@@ -201,7 +201,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.13.0-incubating/querying/datasourcemetadataquery.html b/docs/0.13.0-incubating/querying/datasourcemetadataquery.html
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.13.0-incubating/querying/dimensionspecs.html b/docs/0.13.0-incubating/querying/dimensionspecs.html
index f9a4770..5223a8c 100644
--- a/docs/0.13.0-incubating/querying/dimensionspecs.html
+++ b/docs/0.13.0-incubating/querying/dimensionspecs.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -627,7 +627,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.13.0-incubating/querying/filters.html b/docs/0.13.0-incubating/querying/filters.html
index 5650393..ecc7bc0 100644
--- a/docs/0.13.0-incubating/querying/filters.html
+++ b/docs/0.13.0-incubating/querying/filters.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -776,7 +776,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.13.0-incubating/querying/granularities.html b/docs/0.13.0-incubating/querying/granularities.html
index d897bb5..7dee13c 100644
--- a/docs/0.13.0-incubating/querying/granularities.html
+++ b/docs/0.13.0-incubating/querying/granularities.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -527,7 +527,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.13.0-incubating/querying/groupbyquery.html b/docs/0.13.0-incubating/querying/groupbyquery.html
index 9988a80..a906387 100644
--- a/docs/0.13.0-incubating/querying/groupbyquery.html
+++ b/docs/0.13.0-incubating/querying/groupbyquery.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -774,7 +774,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.13.0-incubating/querying/having.html b/docs/0.13.0-incubating/querying/having.html
index c6e458e..fbe810a 100644
--- a/docs/0.13.0-incubating/querying/having.html
+++ b/docs/0.13.0-incubating/querying/having.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -371,7 +371,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.13.0-incubating/querying/joins.html b/docs/0.13.0-incubating/querying/joins.html
index ecef3e7..7578601 100644
--- a/docs/0.13.0-incubating/querying/joins.html
+++ b/docs/0.13.0-incubating/querying/joins.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -201,7 +201,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.13.0-incubating/querying/limitspec.html b/docs/0.13.0-incubating/querying/limitspec.html
index 494ca61..584bf34 100644
--- a/docs/0.13.0-incubating/querying/limitspec.html
+++ b/docs/0.13.0-incubating/querying/limitspec.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -193,7 +193,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.13.0-incubating/querying/lookups.html b/docs/0.13.0-incubating/querying/lookups.html
index a7c78d0..7452d50 100644
--- a/docs/0.13.0-incubating/querying/lookups.html
+++ b/docs/0.13.0-incubating/querying/lookups.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -640,7 +640,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.13.0-incubating/querying/multi-value-dimensions.html b/docs/0.13.0-incubating/querying/multi-value-dimensions.html
index 32343b4..b0d26db 100644
--- a/docs/0.13.0-incubating/querying/multi-value-dimensions.html
+++ b/docs/0.13.0-incubating/querying/multi-value-dimensions.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -456,7 +456,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.13.0-incubating/querying/multitenancy.html b/docs/0.13.0-incubating/querying/multitenancy.html
index 912d5e5..ccd90ee 100644
--- a/docs/0.13.0-incubating/querying/multitenancy.html
+++ b/docs/0.13.0-incubating/querying/multitenancy.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -249,7 +249,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.13.0-incubating/querying/post-aggregations.html b/docs/0.13.0-incubating/querying/post-aggregations.html
index def950e..f9ac082 100644
--- a/docs/0.13.0-incubating/querying/post-aggregations.html
+++ b/docs/0.13.0-incubating/querying/post-aggregations.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -336,7 +336,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.13.0-incubating/querying/query-context.html b/docs/0.13.0-incubating/querying/query-context.html
index 963a504..9aff6de 100644
--- a/docs/0.13.0-incubating/querying/query-context.html
+++ b/docs/0.13.0-incubating/querying/query-context.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -288,7 +288,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.13.0-incubating/querying/querying.html b/docs/0.13.0-incubating/querying/querying.html
index b31b765..2640e22 100644
--- a/docs/0.13.0-incubating/querying/querying.html
+++ b/docs/0.13.0-incubating/querying/querying.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -300,7 +300,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.13.0-incubating/querying/scan-query.html b/docs/0.13.0-incubating/querying/scan-query.html
index eb3f04c..3570546 100644
--- a/docs/0.13.0-incubating/querying/scan-query.html
+++ b/docs/0.13.0-incubating/querying/scan-query.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -379,7 +379,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.13.0-incubating/querying/searchquery.html b/docs/0.13.0-incubating/querying/searchquery.html
index 4b782b6..fb5ac95 100644
--- a/docs/0.13.0-incubating/querying/searchquery.html
+++ b/docs/0.13.0-incubating/querying/searchquery.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -343,7 +343,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.13.0-incubating/querying/searchqueryspec.html b/docs/0.13.0-incubating/querying/searchqueryspec.html
index 3636755..1762189 100644
--- a/docs/0.13.0-incubating/querying/searchqueryspec.html
+++ b/docs/0.13.0-incubating/querying/searchqueryspec.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -205,7 +205,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.13.0-incubating/querying/segmentmetadataquery.html b/docs/0.13.0-incubating/querying/segmentmetadataquery.html
index f4aca84..94d5746 100644
--- a/docs/0.13.0-incubating/querying/segmentmetadataquery.html
+++ b/docs/0.13.0-incubating/querying/segmentmetadataquery.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -371,7 +371,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.13.0-incubating/querying/select-query.html b/docs/0.13.0-incubating/querying/select-query.html
index 2b81e6a..dd45a94 100644
--- a/docs/0.13.0-incubating/querying/select-query.html
+++ b/docs/0.13.0-incubating/querying/select-query.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -437,7 +437,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.13.0-incubating/querying/sorting-orders.html b/docs/0.13.0-incubating/querying/sorting-orders.html
index 5dd5270..659596a 100644
--- a/docs/0.13.0-incubating/querying/sorting-orders.html
+++ b/docs/0.13.0-incubating/querying/sorting-orders.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -197,7 +197,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.13.0-incubating/querying/sql.html b/docs/0.13.0-incubating/querying/sql.html
index 4f4ce5f..dcd6ebc 100644
--- a/docs/0.13.0-incubating/querying/sql.html
+++ b/docs/0.13.0-incubating/querying/sql.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -1514,7 +1514,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.13.0-incubating/querying/timeboundaryquery.html b/docs/0.13.0-incubating/querying/timeboundaryquery.html
index b2df494..3d1f51b 100644
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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@@ -222,7 +222,7 @@
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-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
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diff --git a/docs/0.13.0-incubating/querying/timeseriesquery.html b/docs/0.13.0-incubating/querying/timeseriesquery.html
index 9b7db50..3ec8711 100644
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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@@ -334,7 +334,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.13.0-incubating/querying/topnmetricspec.html b/docs/0.13.0-incubating/querying/topnmetricspec.html
index 0ebfe34..739d524 100644
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -269,7 +269,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.13.0-incubating/querying/topnquery.html b/docs/0.13.0-incubating/querying/topnquery.html
index 9f2d145..6c25766 100644
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -439,7 +439,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.13.0-incubating/querying/virtual-columns.html b/docs/0.13.0-incubating/querying/virtual-columns.html
index 4af759e..afdbd4c 100644
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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@@ -235,7 +235,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.13.0-incubating/tutorials/cluster.html b/docs/0.13.0-incubating/tutorials/cluster.html
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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@@ -523,7 +523,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.13.0-incubating/tutorials/index.html b/docs/0.13.0-incubating/tutorials/index.html
index a64d946..80bea25 100644
--- a/docs/0.13.0-incubating/tutorials/index.html
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -333,7 +333,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.13.0-incubating/tutorials/tutorial-batch-hadoop.html b/docs/0.13.0-incubating/tutorials/tutorial-batch-hadoop.html
index 668ce30..cb71c6a 100644
--- a/docs/0.13.0-incubating/tutorials/tutorial-batch-hadoop.html
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -357,7 +357,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.13.0-incubating/tutorials/tutorial-batch.html b/docs/0.13.0-incubating/tutorials/tutorial-batch.html
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+++ b/docs/0.13.0-incubating/tutorials/tutorial-batch.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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@@ -308,7 +308,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.13.0-incubating/tutorials/tutorial-compaction.html b/docs/0.13.0-incubating/tutorials/tutorial-compaction.html
index 6df2107..371703c 100644
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+++ b/docs/0.13.0-incubating/tutorials/tutorial-compaction.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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@@ -255,7 +255,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.13.0-incubating/tutorials/tutorial-delete-data.html b/docs/0.13.0-incubating/tutorials/tutorial-delete-data.html
index bcc6564..61077fe 100644
--- a/docs/0.13.0-incubating/tutorials/tutorial-delete-data.html
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -304,7 +304,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.13.0-incubating/tutorials/tutorial-ingestion-spec.html b/docs/0.13.0-incubating/tutorials/tutorial-ingestion-spec.html
index 4f0cb21..093816d 100644
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+++ b/docs/0.13.0-incubating/tutorials/tutorial-ingestion-spec.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -745,7 +745,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.13.0-incubating/tutorials/tutorial-kafka.html b/docs/0.13.0-incubating/tutorials/tutorial-kafka.html
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--- a/docs/0.13.0-incubating/tutorials/tutorial-kafka.html
+++ b/docs/0.13.0-incubating/tutorials/tutorial-kafka.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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@@ -231,7 +231,7 @@
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     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.13.0-incubating/tutorials/tutorial-query.html b/docs/0.13.0-incubating/tutorials/tutorial-query.html
index 9bf5617..715797f 100644
--- a/docs/0.13.0-incubating/tutorials/tutorial-query.html
+++ b/docs/0.13.0-incubating/tutorials/tutorial-query.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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@@ -410,7 +410,7 @@
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     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.13.0-incubating/tutorials/tutorial-retention.html b/docs/0.13.0-incubating/tutorials/tutorial-retention.html
index c9c87b4..46f102d 100644
--- a/docs/0.13.0-incubating/tutorials/tutorial-retention.html
+++ b/docs/0.13.0-incubating/tutorials/tutorial-retention.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -253,7 +253,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.13.0-incubating/tutorials/tutorial-rollup.html b/docs/0.13.0-incubating/tutorials/tutorial-rollup.html
index 71c8fbd..a4cf277 100644
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+++ b/docs/0.13.0-incubating/tutorials/tutorial-rollup.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -314,7 +314,7 @@
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     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.13.0-incubating/tutorials/tutorial-tranquility.html b/docs/0.13.0-incubating/tutorials/tutorial-tranquility.html
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+++ b/docs/0.13.0-incubating/tutorials/tutorial-tranquility.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -234,7 +234,7 @@
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     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.13.0-incubating/tutorials/tutorial-transform-spec.html b/docs/0.13.0-incubating/tutorials/tutorial-transform-spec.html
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--- a/docs/0.13.0-incubating/tutorials/tutorial-transform-spec.html
+++ b/docs/0.13.0-incubating/tutorials/tutorial-transform-spec.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -290,7 +290,7 @@
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     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.13.0-incubating/tutorials/tutorial-update-data.html b/docs/0.13.0-incubating/tutorials/tutorial-update-data.html
index 2f7344f..605ae70 100644
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+++ b/docs/0.13.0-incubating/tutorials/tutorial-update-data.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -285,7 +285,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.0-incubating/comparisons/druid-vs-elasticsearch.html b/docs/0.14.0-incubating/comparisons/druid-vs-elasticsearch.html
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.0-incubating/comparisons/druid-vs-key-value.html b/docs/0.14.0-incubating/comparisons/druid-vs-key-value.html
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+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.0-incubating/comparisons/druid-vs-kudu.html b/docs/0.14.0-incubating/comparisons/druid-vs-kudu.html
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-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.0-incubating/comparisons/druid-vs-redshift.html b/docs/0.14.0-incubating/comparisons/druid-vs-redshift.html
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-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.0-incubating/comparisons/druid-vs-spark.html b/docs/0.14.0-incubating/comparisons/druid-vs-spark.html
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.0-incubating/comparisons/druid-vs-sql-on-hadoop.html b/docs/0.14.0-incubating/comparisons/druid-vs-sql-on-hadoop.html
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
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diff --git a/docs/0.14.0-incubating/configuration/index.html b/docs/0.14.0-incubating/configuration/index.html
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-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
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-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
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-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
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diff --git a/docs/0.14.0-incubating/configuration/realtime.html b/docs/0.14.0-incubating/configuration/realtime.html
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-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.0-incubating/dependencies/cassandra-deep-storage.html b/docs/0.14.0-incubating/dependencies/cassandra-deep-storage.html
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-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
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-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
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diff --git a/docs/0.14.0-incubating/dependencies/deep-storage.html b/docs/0.14.0-incubating/dependencies/deep-storage.html
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-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.0-incubating/dependencies/metadata-storage.html b/docs/0.14.0-incubating/dependencies/metadata-storage.html
index 75394f0..0cecfab 100644
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-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
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-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.0-incubating/design/auth.html b/docs/0.14.0-incubating/design/auth.html
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
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diff --git a/docs/0.14.0-incubating/design/broker.html b/docs/0.14.0-incubating/design/broker.html
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-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
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diff --git a/docs/0.14.0-incubating/design/coordinator.html b/docs/0.14.0-incubating/design/coordinator.html
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-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
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-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
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-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
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     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.0-incubating/design/index.html b/docs/0.14.0-incubating/design/index.html
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
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     <a href="/faq">FAQ</a>
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-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
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-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
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-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
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diff --git a/docs/0.14.0-incubating/design/overlord.html b/docs/0.14.0-incubating/design/overlord.html
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-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
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-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.0-incubating/design/peons.html b/docs/0.14.0-incubating/design/peons.html
index 66f45da..633a2ef 100644
--- a/docs/0.14.0-incubating/design/peons.html
+++ b/docs/0.14.0-incubating/design/peons.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -188,7 +188,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.0-incubating/design/plumber.html b/docs/0.14.0-incubating/design/plumber.html
index 6ca3786..beff3f3 100644
--- a/docs/0.14.0-incubating/design/plumber.html
+++ b/docs/0.14.0-incubating/design/plumber.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -181,7 +181,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.0-incubating/design/processes.html b/docs/0.14.0-incubating/design/processes.html
index 27c4a43..5b53068 100644
--- a/docs/0.14.0-incubating/design/processes.html
+++ b/docs/0.14.0-incubating/design/processes.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -279,7 +279,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.0-incubating/design/realtime.html b/docs/0.14.0-incubating/design/realtime.html
index c7329a4..0f87e03 100644
--- a/docs/0.14.0-incubating/design/realtime.html
+++ b/docs/0.14.0-incubating/design/realtime.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -223,7 +223,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.0-incubating/design/segments.html b/docs/0.14.0-incubating/design/segments.html
index 9899734..3634418 100644
--- a/docs/0.14.0-incubating/design/segments.html
+++ b/docs/0.14.0-incubating/design/segments.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -343,7 +343,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.0-incubating/development/build.html b/docs/0.14.0-incubating/development/build.html
index 475851e..ea7b9e5 100644
--- a/docs/0.14.0-incubating/development/build.html
+++ b/docs/0.14.0-incubating/development/build.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -204,7 +204,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.0-incubating/development/experimental.html b/docs/0.14.0-incubating/development/experimental.html
index 7ae43cc..d7e183d 100644
--- a/docs/0.14.0-incubating/development/experimental.html
+++ b/docs/0.14.0-incubating/development/experimental.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -180,7 +180,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.0-incubating/development/extensions-contrib/ambari-metrics-emitter.html b/docs/0.14.0-incubating/development/extensions-contrib/ambari-metrics-emitter.html
index 300c073..05f1796 100644
--- a/docs/0.14.0-incubating/development/extensions-contrib/ambari-metrics-emitter.html
+++ b/docs/0.14.0-incubating/development/extensions-contrib/ambari-metrics-emitter.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -308,7 +308,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.0-incubating/development/extensions-contrib/azure.html b/docs/0.14.0-incubating/development/extensions-contrib/azure.html
index 0a3617e..09ae777 100644
--- a/docs/0.14.0-incubating/development/extensions-contrib/azure.html
+++ b/docs/0.14.0-incubating/development/extensions-contrib/azure.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -332,7 +332,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.0-incubating/development/extensions-contrib/cassandra.html b/docs/0.14.0-incubating/development/extensions-contrib/cassandra.html
index 8e7b5b0..8c8b453 100644
--- a/docs/0.14.0-incubating/development/extensions-contrib/cassandra.html
+++ b/docs/0.14.0-incubating/development/extensions-contrib/cassandra.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -175,7 +175,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.0-incubating/development/extensions-contrib/cloudfiles.html b/docs/0.14.0-incubating/development/extensions-contrib/cloudfiles.html
index 9bdca79..99d0675 100644
--- a/docs/0.14.0-incubating/development/extensions-contrib/cloudfiles.html
+++ b/docs/0.14.0-incubating/development/extensions-contrib/cloudfiles.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -350,7 +350,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.0-incubating/development/extensions-contrib/distinctcount.html b/docs/0.14.0-incubating/development/extensions-contrib/distinctcount.html
index 098c55f..2c55a99 100644
--- a/docs/0.14.0-incubating/development/extensions-contrib/distinctcount.html
+++ b/docs/0.14.0-incubating/development/extensions-contrib/distinctcount.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -235,7 +235,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.0-incubating/development/extensions-contrib/google.html b/docs/0.14.0-incubating/development/extensions-contrib/google.html
index f76a14b..8fceb09 100644
--- a/docs/0.14.0-incubating/development/extensions-contrib/google.html
+++ b/docs/0.14.0-incubating/development/extensions-contrib/google.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -310,7 +310,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.0-incubating/development/extensions-contrib/graphite.html b/docs/0.14.0-incubating/development/extensions-contrib/graphite.html
index 9b9f520..9f3ce61 100644
--- a/docs/0.14.0-incubating/development/extensions-contrib/graphite.html
+++ b/docs/0.14.0-incubating/development/extensions-contrib/graphite.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -315,7 +315,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.0-incubating/development/extensions-contrib/influx.html b/docs/0.14.0-incubating/development/extensions-contrib/influx.html
index 0160ae6..8483f57 100644
--- a/docs/0.14.0-incubating/development/extensions-contrib/influx.html
+++ b/docs/0.14.0-incubating/development/extensions-contrib/influx.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -210,7 +210,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.0-incubating/development/extensions-contrib/kafka-emitter.html b/docs/0.14.0-incubating/development/extensions-contrib/kafka-emitter.html
index bbbc61d..1ffc406 100644
--- a/docs/0.14.0-incubating/development/extensions-contrib/kafka-emitter.html
+++ b/docs/0.14.0-incubating/development/extensions-contrib/kafka-emitter.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -228,7 +228,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.0-incubating/development/extensions-contrib/kafka-simple.html b/docs/0.14.0-incubating/development/extensions-contrib/kafka-simple.html
index aab0303..8ba04aa 100644
--- a/docs/0.14.0-incubating/development/extensions-contrib/kafka-simple.html
+++ b/docs/0.14.0-incubating/development/extensions-contrib/kafka-simple.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -231,7 +231,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.0-incubating/development/extensions-contrib/materialized-view.html b/docs/0.14.0-incubating/development/extensions-contrib/materialized-view.html
index da0224b..f6e9088 100644
--- a/docs/0.14.0-incubating/development/extensions-contrib/materialized-view.html
+++ b/docs/0.14.0-incubating/development/extensions-contrib/materialized-view.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -345,7 +345,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.0-incubating/development/extensions-contrib/opentsdb-emitter.html b/docs/0.14.0-incubating/development/extensions-contrib/opentsdb-emitter.html
index 800a3de..20a12b7 100644
--- a/docs/0.14.0-incubating/development/extensions-contrib/opentsdb-emitter.html
+++ b/docs/0.14.0-incubating/development/extensions-contrib/opentsdb-emitter.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -250,7 +250,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.0-incubating/development/extensions-contrib/orc.html b/docs/0.14.0-incubating/development/extensions-contrib/orc.html
index f8cb5af..849b027 100644
--- a/docs/0.14.0-incubating/development/extensions-contrib/orc.html
+++ b/docs/0.14.0-incubating/development/extensions-contrib/orc.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -281,7 +281,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.0-incubating/development/extensions-contrib/rabbitmq.html b/docs/0.14.0-incubating/development/extensions-contrib/rabbitmq.html
index f7b5fb8..0ac4afb 100644
--- a/docs/0.14.0-incubating/development/extensions-contrib/rabbitmq.html
+++ b/docs/0.14.0-incubating/development/extensions-contrib/rabbitmq.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -309,7 +309,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.0-incubating/development/extensions-contrib/redis-cache.html b/docs/0.14.0-incubating/development/extensions-contrib/redis-cache.html
index f737cbf..6489f3d 100644
--- a/docs/0.14.0-incubating/development/extensions-contrib/redis-cache.html
+++ b/docs/0.14.0-incubating/development/extensions-contrib/redis-cache.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -255,7 +255,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.0-incubating/development/extensions-contrib/rocketmq.html b/docs/0.14.0-incubating/development/extensions-contrib/rocketmq.html
index 6baf93b..2746bec 100644
--- a/docs/0.14.0-incubating/development/extensions-contrib/rocketmq.html
+++ b/docs/0.14.0-incubating/development/extensions-contrib/rocketmq.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -173,7 +173,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.0-incubating/development/extensions-contrib/sqlserver.html b/docs/0.14.0-incubating/development/extensions-contrib/sqlserver.html
index 1f90b09..50ef8fc 100644
--- a/docs/0.14.0-incubating/development/extensions-contrib/sqlserver.html
+++ b/docs/0.14.0-incubating/development/extensions-contrib/sqlserver.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -203,7 +203,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.0-incubating/development/extensions-contrib/statsd.html b/docs/0.14.0-incubating/development/extensions-contrib/statsd.html
index b7cd00b..0551b7c 100644
--- a/docs/0.14.0-incubating/development/extensions-contrib/statsd.html
+++ b/docs/0.14.0-incubating/development/extensions-contrib/statsd.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -266,7 +266,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.0-incubating/development/extensions-contrib/thrift.html b/docs/0.14.0-incubating/development/extensions-contrib/thrift.html
index 44c3fe2..6ec2708 100644
--- a/docs/0.14.0-incubating/development/extensions-contrib/thrift.html
+++ b/docs/0.14.0-incubating/development/extensions-contrib/thrift.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -292,7 +292,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.0-incubating/development/extensions-contrib/time-min-max.html b/docs/0.14.0-incubating/development/extensions-contrib/time-min-max.html
index b456da1..79d58df 100644
--- a/docs/0.14.0-incubating/development/extensions-contrib/time-min-max.html
+++ b/docs/0.14.0-incubating/development/extensions-contrib/time-min-max.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -234,7 +234,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.0-incubating/development/extensions-core/approximate-histograms.html b/docs/0.14.0-incubating/development/extensions-core/approximate-histograms.html
index 77a59eb..08d2d10 100644
--- a/docs/0.14.0-incubating/development/extensions-core/approximate-histograms.html
+++ b/docs/0.14.0-incubating/development/extensions-core/approximate-histograms.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -486,7 +486,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.0-incubating/development/extensions-core/avro.html b/docs/0.14.0-incubating/development/extensions-core/avro.html
index 1171afc..d75e677 100644
--- a/docs/0.14.0-incubating/development/extensions-core/avro.html
+++ b/docs/0.14.0-incubating/development/extensions-core/avro.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -474,7 +474,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.0-incubating/development/extensions-core/bloom-filter.html b/docs/0.14.0-incubating/development/extensions-core/bloom-filter.html
index 15d9b0a..4939a65 100644
--- a/docs/0.14.0-incubating/development/extensions-core/bloom-filter.html
+++ b/docs/0.14.0-incubating/development/extensions-core/bloom-filter.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -345,7 +345,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.0-incubating/development/extensions-core/datasketches-extension.html b/docs/0.14.0-incubating/development/extensions-core/datasketches-extension.html
index dc57340..b81386a 100644
--- a/docs/0.14.0-incubating/development/extensions-core/datasketches-extension.html
+++ b/docs/0.14.0-incubating/development/extensions-core/datasketches-extension.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -183,7 +183,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.0-incubating/development/extensions-core/datasketches-hll.html b/docs/0.14.0-incubating/development/extensions-core/datasketches-hll.html
index 3ee9104..ec7d558 100644
--- a/docs/0.14.0-incubating/development/extensions-core/datasketches-hll.html
+++ b/docs/0.14.0-incubating/development/extensions-core/datasketches-hll.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -253,7 +253,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.0-incubating/development/extensions-core/datasketches-quantiles.html b/docs/0.14.0-incubating/development/extensions-core/datasketches-quantiles.html
index a6790a4..53e8a49 100644
--- a/docs/0.14.0-incubating/development/extensions-core/datasketches-quantiles.html
+++ b/docs/0.14.0-incubating/development/extensions-core/datasketches-quantiles.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -262,7 +262,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.0-incubating/development/extensions-core/datasketches-theta.html b/docs/0.14.0-incubating/development/extensions-core/datasketches-theta.html
index 3bc9c0a..c1e6579 100644
--- a/docs/0.14.0-incubating/development/extensions-core/datasketches-theta.html
+++ b/docs/0.14.0-incubating/development/extensions-core/datasketches-theta.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -416,7 +416,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.0-incubating/development/extensions-core/datasketches-tuple.html b/docs/0.14.0-incubating/development/extensions-core/datasketches-tuple.html
index 5c28c20..f8d8b83 100644
--- a/docs/0.14.0-incubating/development/extensions-core/datasketches-tuple.html
+++ b/docs/0.14.0-incubating/development/extensions-core/datasketches-tuple.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -318,7 +318,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.0-incubating/development/extensions-core/druid-basic-security.html b/docs/0.14.0-incubating/development/extensions-core/druid-basic-security.html
index a25a936..4ad0e4c 100644
--- a/docs/0.14.0-incubating/development/extensions-core/druid-basic-security.html
+++ b/docs/0.14.0-incubating/development/extensions-core/druid-basic-security.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -660,7 +660,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.0-incubating/development/extensions-core/druid-kerberos.html b/docs/0.14.0-incubating/development/extensions-core/druid-kerberos.html
index 97d0263..dc98a9f 100644
--- a/docs/0.14.0-incubating/development/extensions-core/druid-kerberos.html
+++ b/docs/0.14.0-incubating/development/extensions-core/druid-kerberos.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -347,7 +347,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.0-incubating/development/extensions-core/druid-lookups.html b/docs/0.14.0-incubating/development/extensions-core/druid-lookups.html
index eaebba0..c760c70 100644
--- a/docs/0.14.0-incubating/development/extensions-core/druid-lookups.html
+++ b/docs/0.14.0-incubating/development/extensions-core/druid-lookups.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -407,7 +407,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.0-incubating/development/extensions-core/examples.html b/docs/0.14.0-incubating/development/extensions-core/examples.html
index 5b59b60..4549c2e 100644
--- a/docs/0.14.0-incubating/development/extensions-core/examples.html
+++ b/docs/0.14.0-incubating/development/extensions-core/examples.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -208,7 +208,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.0-incubating/development/extensions-core/hdfs.html b/docs/0.14.0-incubating/development/extensions-core/hdfs.html
index 14b65af..94a01b5 100644
--- a/docs/0.14.0-incubating/development/extensions-core/hdfs.html
+++ b/docs/0.14.0-incubating/development/extensions-core/hdfs.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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@@ -244,7 +244,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.0-incubating/development/extensions-core/kafka-eight-firehose.html b/docs/0.14.0-incubating/development/extensions-core/kafka-eight-firehose.html
index 725c90a..6ead2a0 100644
--- a/docs/0.14.0-incubating/development/extensions-core/kafka-eight-firehose.html
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -213,7 +213,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.0-incubating/development/extensions-core/kafka-extraction-namespace.html b/docs/0.14.0-incubating/development/extensions-core/kafka-extraction-namespace.html
index f58a035..a433cb8 100644
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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@@ -235,7 +235,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.0-incubating/development/extensions-core/kafka-ingestion.html b/docs/0.14.0-incubating/development/extensions-core/kafka-ingestion.html
index b3c5c19..1d5e708 100644
--- a/docs/0.14.0-incubating/development/extensions-core/kafka-ingestion.html
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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@@ -763,7 +763,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.0-incubating/development/extensions-core/kinesis-ingestion.html b/docs/0.14.0-incubating/development/extensions-core/kinesis-ingestion.html
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--- a/docs/0.14.0-incubating/development/extensions-core/kinesis-ingestion.html
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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@@ -859,7 +859,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.0-incubating/development/extensions-core/lookups-cached-global.html b/docs/0.14.0-incubating/development/extensions-core/lookups-cached-global.html
index 391425c..934c5d7 100644
--- a/docs/0.14.0-incubating/development/extensions-core/lookups-cached-global.html
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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@@ -691,7 +691,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.0-incubating/development/extensions-core/mysql.html b/docs/0.14.0-incubating/development/extensions-core/mysql.html
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--- a/docs/0.14.0-incubating/development/extensions-core/mysql.html
+++ b/docs/0.14.0-incubating/development/extensions-core/mysql.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -310,7 +310,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.0-incubating/development/extensions-core/parquet.html b/docs/0.14.0-incubating/development/extensions-core/parquet.html
index 71c4cf1..c5c786f 100644
--- a/docs/0.14.0-incubating/development/extensions-core/parquet.html
+++ b/docs/0.14.0-incubating/development/extensions-core/parquet.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -378,7 +378,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.0-incubating/development/extensions-core/postgresql.html b/docs/0.14.0-incubating/development/extensions-core/postgresql.html
index 77e3bc5..6e6a5dc 100644
--- a/docs/0.14.0-incubating/development/extensions-core/postgresql.html
+++ b/docs/0.14.0-incubating/development/extensions-core/postgresql.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -284,7 +284,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.0-incubating/development/extensions-core/protobuf.html b/docs/0.14.0-incubating/development/extensions-core/protobuf.html
index 92a5bbe..b498463 100644
--- a/docs/0.14.0-incubating/development/extensions-core/protobuf.html
+++ b/docs/0.14.0-incubating/development/extensions-core/protobuf.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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@@ -384,7 +384,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.0-incubating/development/extensions-core/s3.html b/docs/0.14.0-incubating/development/extensions-core/s3.html
index 6c19615..16e678a 100644
--- a/docs/0.14.0-incubating/development/extensions-core/s3.html
+++ b/docs/0.14.0-incubating/development/extensions-core/s3.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -364,7 +364,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.0-incubating/development/extensions-core/simple-client-sslcontext.html b/docs/0.14.0-incubating/development/extensions-core/simple-client-sslcontext.html
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--- a/docs/0.14.0-incubating/development/extensions-core/simple-client-sslcontext.html
+++ b/docs/0.14.0-incubating/development/extensions-core/simple-client-sslcontext.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -272,7 +272,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.0-incubating/development/extensions-core/stats.html b/docs/0.14.0-incubating/development/extensions-core/stats.html
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--- a/docs/0.14.0-incubating/development/extensions-core/stats.html
+++ b/docs/0.14.0-incubating/development/extensions-core/stats.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -307,7 +307,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.0-incubating/development/extensions-core/test-stats.html b/docs/0.14.0-incubating/development/extensions-core/test-stats.html
index 504d376..66845e6 100644
--- a/docs/0.14.0-incubating/development/extensions-core/test-stats.html
+++ b/docs/0.14.0-incubating/development/extensions-core/test-stats.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -259,7 +259,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.0-incubating/development/extensions.html b/docs/0.14.0-incubating/development/extensions.html
index a5819ad..f150417 100644
--- a/docs/0.14.0-incubating/development/extensions.html
+++ b/docs/0.14.0-incubating/development/extensions.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -417,7 +417,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.0-incubating/development/geo.html b/docs/0.14.0-incubating/development/geo.html
index 99cd23e..9d32626 100644
--- a/docs/0.14.0-incubating/development/geo.html
+++ b/docs/0.14.0-incubating/development/geo.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -274,7 +274,7 @@
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     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.0-incubating/development/integrating-druid-with-other-technologies.html b/docs/0.14.0-incubating/development/integrating-druid-with-other-technologies.html
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--- a/docs/0.14.0-incubating/development/integrating-druid-with-other-technologies.html
+++ b/docs/0.14.0-incubating/development/integrating-druid-with-other-technologies.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -183,7 +183,7 @@
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     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.0-incubating/development/javascript.html b/docs/0.14.0-incubating/development/javascript.html
index aab001c..8131d0b 100644
--- a/docs/0.14.0-incubating/development/javascript.html
+++ b/docs/0.14.0-incubating/development/javascript.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -221,7 +221,7 @@
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     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.0-incubating/development/modules.html b/docs/0.14.0-incubating/development/modules.html
index 8fe772e..8c5f63d 100644
--- a/docs/0.14.0-incubating/development/modules.html
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -410,7 +410,7 @@
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     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.0-incubating/development/overview.html b/docs/0.14.0-incubating/development/overview.html
index 4919ed6..14f59d7 100644
--- a/docs/0.14.0-incubating/development/overview.html
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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@@ -220,7 +220,7 @@
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     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
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diff --git a/docs/0.14.0-incubating/development/router.html b/docs/0.14.0-incubating/development/router.html
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+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
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-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
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-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
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-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
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-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
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-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
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     <a href="/downloads.html">Download</a>&ensp;·&ensp;
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-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
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-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
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-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
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-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
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-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
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-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
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-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
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diff --git a/docs/0.14.0-incubating/ingestion/flatten-json.html b/docs/0.14.0-incubating/ingestion/flatten-json.html
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
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-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.0-incubating/ingestion/hadoop-vs-native-batch.html b/docs/0.14.0-incubating/ingestion/hadoop-vs-native-batch.html
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-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
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-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
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diff --git a/docs/0.14.0-incubating/ingestion/hadoop.html b/docs/0.14.0-incubating/ingestion/hadoop.html
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
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-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
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diff --git a/docs/0.14.0-incubating/ingestion/index.html b/docs/0.14.0-incubating/ingestion/index.html
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
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-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
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diff --git a/docs/0.14.0-incubating/ingestion/misc-tasks.html b/docs/0.14.0-incubating/ingestion/misc-tasks.html
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
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     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.0-incubating/ingestion/native_tasks.html b/docs/0.14.0-incubating/ingestion/native_tasks.html
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
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-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
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diff --git a/docs/0.14.0-incubating/ingestion/reports.html b/docs/0.14.0-incubating/ingestion/reports.html
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-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
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-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
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-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.0-incubating/ingestion/schema-design.html b/docs/0.14.0-incubating/ingestion/schema-design.html
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-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
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     <a href="/faq">FAQ</a>
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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@@ -200,7 +200,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.0-incubating/ingestion/stream-pull.html b/docs/0.14.0-incubating/ingestion/stream-pull.html
index 92fd462..f84b344 100644
--- a/docs/0.14.0-incubating/ingestion/stream-pull.html
+++ b/docs/0.14.0-incubating/ingestion/stream-pull.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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@@ -732,7 +732,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.0-incubating/ingestion/stream-push.html b/docs/0.14.0-incubating/ingestion/stream-push.html
index d6affa3..cb24697 100644
--- a/docs/0.14.0-incubating/ingestion/stream-push.html
+++ b/docs/0.14.0-incubating/ingestion/stream-push.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -328,7 +328,7 @@
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     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.0-incubating/ingestion/tasks.html b/docs/0.14.0-incubating/ingestion/tasks.html
index 3436ea3..efd9b0c 100644
--- a/docs/0.14.0-incubating/ingestion/tasks.html
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -222,7 +222,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.0-incubating/ingestion/transform-spec.html b/docs/0.14.0-incubating/ingestion/transform-spec.html
index c316e03..16b6968 100644
--- a/docs/0.14.0-incubating/ingestion/transform-spec.html
+++ b/docs/0.14.0-incubating/ingestion/transform-spec.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -264,7 +264,7 @@
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     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.0-incubating/ingestion/update-existing-data.html b/docs/0.14.0-incubating/ingestion/update-existing-data.html
index 2f56bb9..ff37a73 100644
--- a/docs/0.14.0-incubating/ingestion/update-existing-data.html
+++ b/docs/0.14.0-incubating/ingestion/update-existing-data.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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@@ -380,7 +380,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.0-incubating/misc/math-expr.html b/docs/0.14.0-incubating/misc/math-expr.html
index b8d23a4..689c487 100644
--- a/docs/0.14.0-incubating/misc/math-expr.html
+++ b/docs/0.14.0-incubating/misc/math-expr.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -521,7 +521,7 @@
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     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.0-incubating/misc/papers-and-talks.html b/docs/0.14.0-incubating/misc/papers-and-talks.html
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--- a/docs/0.14.0-incubating/misc/papers-and-talks.html
+++ b/docs/0.14.0-incubating/misc/papers-and-talks.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -185,7 +185,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.0-incubating/operations/alerts.html b/docs/0.14.0-incubating/operations/alerts.html
index 54b5d90..d439c58 100644
--- a/docs/0.14.0-incubating/operations/alerts.html
+++ b/docs/0.14.0-incubating/operations/alerts.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -184,7 +184,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.0-incubating/operations/api-reference.html b/docs/0.14.0-incubating/operations/api-reference.html
index c442cc4..7d16768 100644
--- a/docs/0.14.0-incubating/operations/api-reference.html
+++ b/docs/0.14.0-incubating/operations/api-reference.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -1146,7 +1146,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.0-incubating/operations/druid-console.html b/docs/0.14.0-incubating/operations/druid-console.html
index ff21217..57cbb50 100644
--- a/docs/0.14.0-incubating/operations/druid-console.html
+++ b/docs/0.14.0-incubating/operations/druid-console.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -232,7 +232,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.0-incubating/operations/dump-segment.html b/docs/0.14.0-incubating/operations/dump-segment.html
index 7db9d21..39f2182 100644
--- a/docs/0.14.0-incubating/operations/dump-segment.html
+++ b/docs/0.14.0-incubating/operations/dump-segment.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -285,7 +285,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.0-incubating/operations/http-compression.html b/docs/0.14.0-incubating/operations/http-compression.html
index 3feb498..29ffe3e 100644
--- a/docs/0.14.0-incubating/operations/http-compression.html
+++ b/docs/0.14.0-incubating/operations/http-compression.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -192,7 +192,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.0-incubating/operations/including-extensions.html b/docs/0.14.0-incubating/operations/including-extensions.html
index d1878e8..e6efd2d 100644
--- a/docs/0.14.0-incubating/operations/including-extensions.html
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -224,7 +224,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.0-incubating/operations/insert-segment-to-db.html b/docs/0.14.0-incubating/operations/insert-segment-to-db.html
index d2af58c..195352b 100644
--- a/docs/0.14.0-incubating/operations/insert-segment-to-db.html
+++ b/docs/0.14.0-incubating/operations/insert-segment-to-db.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -285,7 +285,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.0-incubating/operations/management-uis.html b/docs/0.14.0-incubating/operations/management-uis.html
index 1bed708..2d0eff9 100644
--- a/docs/0.14.0-incubating/operations/management-uis.html
+++ b/docs/0.14.0-incubating/operations/management-uis.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -214,7 +214,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.0-incubating/operations/metrics.html b/docs/0.14.0-incubating/operations/metrics.html
index da753d0..c6d5217 100644
--- a/docs/0.14.0-incubating/operations/metrics.html
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -1178,7 +1178,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.0-incubating/operations/other-hadoop.html b/docs/0.14.0-incubating/operations/other-hadoop.html
index e63cc77..e43b025 100644
--- a/docs/0.14.0-incubating/operations/other-hadoop.html
+++ b/docs/0.14.0-incubating/operations/other-hadoop.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -431,7 +431,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.0-incubating/operations/password-provider.html b/docs/0.14.0-incubating/operations/password-provider.html
index eea37c2..1ff34d1 100644
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -210,7 +210,7 @@
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     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.0-incubating/operations/performance-faq.html b/docs/0.14.0-incubating/operations/performance-faq.html
index 94af801..1092920 100644
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -240,7 +240,7 @@
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     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
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diff --git a/docs/0.14.0-incubating/operations/pull-deps.html b/docs/0.14.0-incubating/operations/pull-deps.html
index 0b9918a..0d22d52 100644
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -283,7 +283,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.0-incubating/operations/recommendations.html b/docs/0.14.0-incubating/operations/recommendations.html
index 56e6b53..fa8c1c1 100644
--- a/docs/0.14.0-incubating/operations/recommendations.html
+++ b/docs/0.14.0-incubating/operations/recommendations.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -235,7 +235,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.0-incubating/operations/reset-cluster.html b/docs/0.14.0-incubating/operations/reset-cluster.html
index f7f9c6b..3742421 100644
--- a/docs/0.14.0-incubating/operations/reset-cluster.html
+++ b/docs/0.14.0-incubating/operations/reset-cluster.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -209,7 +209,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.0-incubating/operations/rolling-updates.html b/docs/0.14.0-incubating/operations/rolling-updates.html
index 34e6887..2ab0155 100644
--- a/docs/0.14.0-incubating/operations/rolling-updates.html
+++ b/docs/0.14.0-incubating/operations/rolling-updates.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -248,7 +248,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.0-incubating/operations/rule-configuration.html b/docs/0.14.0-incubating/operations/rule-configuration.html
index 718bfa5..c2934df 100644
--- a/docs/0.14.0-incubating/operations/rule-configuration.html
+++ b/docs/0.14.0-incubating/operations/rule-configuration.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -371,7 +371,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.0-incubating/operations/segment-optimization.html b/docs/0.14.0-incubating/operations/segment-optimization.html
index a04f57c..9da5248 100644
--- a/docs/0.14.0-incubating/operations/segment-optimization.html
+++ b/docs/0.14.0-incubating/operations/segment-optimization.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -247,7 +247,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.0-incubating/operations/tls-support.html b/docs/0.14.0-incubating/operations/tls-support.html
index 35a5d12..f59c685 100644
--- a/docs/0.14.0-incubating/operations/tls-support.html
+++ b/docs/0.14.0-incubating/operations/tls-support.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -382,7 +382,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.0-incubating/operations/use_sbt_to_build_fat_jar.html b/docs/0.14.0-incubating/operations/use_sbt_to_build_fat_jar.html
index b0090f9..072dab3 100644
--- a/docs/0.14.0-incubating/operations/use_sbt_to_build_fat_jar.html
+++ b/docs/0.14.0-incubating/operations/use_sbt_to_build_fat_jar.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -269,7 +269,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.0-incubating/querying/aggregations.html b/docs/0.14.0-incubating/querying/aggregations.html
index f09cf27..761811a 100644
--- a/docs/0.14.0-incubating/querying/aggregations.html
+++ b/docs/0.14.0-incubating/querying/aggregations.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -443,7 +443,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.0-incubating/querying/caching.html b/docs/0.14.0-incubating/querying/caching.html
index 5ee7ce7..4f708c6 100644
--- a/docs/0.14.0-incubating/querying/caching.html
+++ b/docs/0.14.0-incubating/querying/caching.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -190,7 +190,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.0-incubating/querying/datasource.html b/docs/0.14.0-incubating/querying/datasource.html
index 16d3347..75e96b9 100644
--- a/docs/0.14.0-incubating/querying/datasource.html
+++ b/docs/0.14.0-incubating/querying/datasource.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -201,7 +201,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.0-incubating/querying/datasourcemetadataquery.html b/docs/0.14.0-incubating/querying/datasourcemetadataquery.html
index 0367d59..5b61ac4 100644
--- a/docs/0.14.0-incubating/querying/datasourcemetadataquery.html
+++ b/docs/0.14.0-incubating/querying/datasourcemetadataquery.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -215,7 +215,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.0-incubating/querying/dimensionspecs.html b/docs/0.14.0-incubating/querying/dimensionspecs.html
index 7784db9..ed2eb31 100644
--- a/docs/0.14.0-incubating/querying/dimensionspecs.html
+++ b/docs/0.14.0-incubating/querying/dimensionspecs.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -627,7 +627,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.0-incubating/querying/filters.html b/docs/0.14.0-incubating/querying/filters.html
index d5f97f2..4ca2f8d 100644
--- a/docs/0.14.0-incubating/querying/filters.html
+++ b/docs/0.14.0-incubating/querying/filters.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -778,7 +778,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.0-incubating/querying/granularities.html b/docs/0.14.0-incubating/querying/granularities.html
index 8d9990e..0a67a57 100644
--- a/docs/0.14.0-incubating/querying/granularities.html
+++ b/docs/0.14.0-incubating/querying/granularities.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -527,7 +527,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.0-incubating/querying/groupbyquery.html b/docs/0.14.0-incubating/querying/groupbyquery.html
index 405bb6f..fdfff20 100644
--- a/docs/0.14.0-incubating/querying/groupbyquery.html
+++ b/docs/0.14.0-incubating/querying/groupbyquery.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -774,7 +774,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.0-incubating/querying/having.html b/docs/0.14.0-incubating/querying/having.html
index a0aca5f..a7acc66 100644
--- a/docs/0.14.0-incubating/querying/having.html
+++ b/docs/0.14.0-incubating/querying/having.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -371,7 +371,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.0-incubating/querying/hll-old.html b/docs/0.14.0-incubating/querying/hll-old.html
index 3b231af..2a4882a 100644
--- a/docs/0.14.0-incubating/querying/hll-old.html
+++ b/docs/0.14.0-incubating/querying/hll-old.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -265,7 +265,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.0-incubating/querying/joins.html b/docs/0.14.0-incubating/querying/joins.html
index 47f73db..6fde071 100644
--- a/docs/0.14.0-incubating/querying/joins.html
+++ b/docs/0.14.0-incubating/querying/joins.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -201,7 +201,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.0-incubating/querying/limitspec.html b/docs/0.14.0-incubating/querying/limitspec.html
index 5774d04..ed6e0e9 100644
--- a/docs/0.14.0-incubating/querying/limitspec.html
+++ b/docs/0.14.0-incubating/querying/limitspec.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -193,7 +193,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.0-incubating/querying/lookups.html b/docs/0.14.0-incubating/querying/lookups.html
index a6a8088..d54cc8d 100644
--- a/docs/0.14.0-incubating/querying/lookups.html
+++ b/docs/0.14.0-incubating/querying/lookups.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -644,7 +644,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.0-incubating/querying/multi-value-dimensions.html b/docs/0.14.0-incubating/querying/multi-value-dimensions.html
index 591d011..885bfc0 100644
--- a/docs/0.14.0-incubating/querying/multi-value-dimensions.html
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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@@ -456,7 +456,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.0-incubating/querying/multitenancy.html b/docs/0.14.0-incubating/querying/multitenancy.html
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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@@ -249,7 +249,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.0-incubating/querying/post-aggregations.html b/docs/0.14.0-incubating/querying/post-aggregations.html
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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@@ -336,7 +336,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.0-incubating/querying/query-context.html b/docs/0.14.0-incubating/querying/query-context.html
index 22154b9..665f758 100644
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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@@ -288,7 +288,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.0-incubating/querying/querying.html b/docs/0.14.0-incubating/querying/querying.html
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -300,7 +300,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.0-incubating/querying/scan-query.html b/docs/0.14.0-incubating/querying/scan-query.html
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -379,7 +379,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.0-incubating/querying/searchquery.html b/docs/0.14.0-incubating/querying/searchquery.html
index 29fca23..bee20e0 100644
--- a/docs/0.14.0-incubating/querying/searchquery.html
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -343,7 +343,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.0-incubating/querying/searchqueryspec.html b/docs/0.14.0-incubating/querying/searchqueryspec.html
index ab2b269..d01c167 100644
--- a/docs/0.14.0-incubating/querying/searchqueryspec.html
+++ b/docs/0.14.0-incubating/querying/searchqueryspec.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -205,7 +205,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.0-incubating/querying/segmentmetadataquery.html b/docs/0.14.0-incubating/querying/segmentmetadataquery.html
index 4c0a90f..eb5bb7b 100644
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -371,7 +371,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.0-incubating/querying/select-query.html b/docs/0.14.0-incubating/querying/select-query.html
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--- a/docs/0.14.0-incubating/querying/select-query.html
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -437,7 +437,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.0-incubating/querying/sorting-orders.html b/docs/0.14.0-incubating/querying/sorting-orders.html
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--- a/docs/0.14.0-incubating/querying/sorting-orders.html
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -203,7 +203,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.0-incubating/querying/sql.html b/docs/0.14.0-incubating/querying/sql.html
index 6ef0057..64d175d 100644
--- a/docs/0.14.0-incubating/querying/sql.html
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -1596,7 +1596,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.0-incubating/querying/timeboundaryquery.html b/docs/0.14.0-incubating/querying/timeboundaryquery.html
index b7bd37c..74111fc 100644
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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@@ -222,7 +222,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.0-incubating/querying/timeseriesquery.html b/docs/0.14.0-incubating/querying/timeseriesquery.html
index 5daac08..4c59aa7 100644
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -334,7 +334,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.0-incubating/querying/topnmetricspec.html b/docs/0.14.0-incubating/querying/topnmetricspec.html
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--- a/docs/0.14.0-incubating/querying/topnmetricspec.html
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -269,7 +269,7 @@
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     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.0-incubating/querying/topnquery.html b/docs/0.14.0-incubating/querying/topnquery.html
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -439,7 +439,7 @@
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     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.0-incubating/querying/virtual-columns.html b/docs/0.14.0-incubating/querying/virtual-columns.html
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -235,7 +235,7 @@
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     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.0-incubating/tutorials/cluster.html b/docs/0.14.0-incubating/tutorials/cluster.html
index 610f8fa..756bd3d 100644
--- a/docs/0.14.0-incubating/tutorials/cluster.html
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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@@ -558,7 +558,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.0-incubating/tutorials/index.html b/docs/0.14.0-incubating/tutorials/index.html
index 30a069b..93ddccf 100644
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -334,7 +334,7 @@
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     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.0-incubating/tutorials/tutorial-batch-hadoop.html b/docs/0.14.0-incubating/tutorials/tutorial-batch-hadoop.html
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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@@ -357,7 +357,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
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diff --git a/docs/0.14.0-incubating/tutorials/tutorial-batch.html b/docs/0.14.0-incubating/tutorials/tutorial-batch.html
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--- a/docs/0.14.0-incubating/tutorials/tutorial-batch.html
+++ b/docs/0.14.0-incubating/tutorials/tutorial-batch.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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@@ -308,7 +308,7 @@
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-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.0-incubating/tutorials/tutorial-compaction.html b/docs/0.14.0-incubating/tutorials/tutorial-compaction.html
index e9773e3..33cf73d 100644
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+++ b/docs/0.14.0-incubating/tutorials/tutorial-compaction.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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@@ -298,7 +298,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.0-incubating/tutorials/tutorial-delete-data.html b/docs/0.14.0-incubating/tutorials/tutorial-delete-data.html
index 4bb5471..8cfe824 100644
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+++ b/docs/0.14.0-incubating/tutorials/tutorial-delete-data.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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@@ -306,7 +306,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.0-incubating/tutorials/tutorial-ingestion-spec.html b/docs/0.14.0-incubating/tutorials/tutorial-ingestion-spec.html
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+++ b/docs/0.14.0-incubating/tutorials/tutorial-ingestion-spec.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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@@ -745,7 +745,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
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diff --git a/docs/0.14.0-incubating/tutorials/tutorial-kafka.html b/docs/0.14.0-incubating/tutorials/tutorial-kafka.html
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+++ b/docs/0.14.0-incubating/tutorials/tutorial-kafka.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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@@ -233,7 +233,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
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diff --git a/docs/0.14.0-incubating/tutorials/tutorial-query.html b/docs/0.14.0-incubating/tutorials/tutorial-query.html
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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@@ -410,7 +410,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
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diff --git a/docs/0.14.0-incubating/tutorials/tutorial-retention.html b/docs/0.14.0-incubating/tutorials/tutorial-retention.html
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+++ b/docs/0.14.0-incubating/tutorials/tutorial-retention.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -258,7 +258,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.0-incubating/tutorials/tutorial-rollup.html b/docs/0.14.0-incubating/tutorials/tutorial-rollup.html
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+++ b/docs/0.14.0-incubating/tutorials/tutorial-rollup.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -314,7 +314,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.0-incubating/tutorials/tutorial-tranquility.html b/docs/0.14.0-incubating/tutorials/tutorial-tranquility.html
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+++ b/docs/0.14.0-incubating/tutorials/tutorial-tranquility.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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@@ -234,7 +234,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.0-incubating/tutorials/tutorial-transform-spec.html b/docs/0.14.0-incubating/tutorials/tutorial-transform-spec.html
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+++ b/docs/0.14.0-incubating/tutorials/tutorial-transform-spec.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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@@ -290,7 +290,7 @@
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-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.0-incubating/tutorials/tutorial-update-data.html b/docs/0.14.0-incubating/tutorials/tutorial-update-data.html
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+++ b/docs/0.14.0-incubating/tutorials/tutorial-update-data.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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@@ -285,7 +285,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.1-incubating/comparisons/druid-vs-elasticsearch.html b/docs/0.14.1-incubating/comparisons/druid-vs-elasticsearch.html
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--- a/docs/0.14.1-incubating/comparisons/druid-vs-elasticsearch.html
+++ b/docs/0.14.1-incubating/comparisons/druid-vs-elasticsearch.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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@@ -184,7 +184,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.1-incubating/comparisons/druid-vs-key-value.html b/docs/0.14.1-incubating/comparisons/druid-vs-key-value.html
index 9ee04ed..d6b62a0 100644
--- a/docs/0.14.1-incubating/comparisons/druid-vs-key-value.html
+++ b/docs/0.14.1-incubating/comparisons/druid-vs-key-value.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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@@ -193,7 +193,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.1-incubating/comparisons/druid-vs-kudu.html b/docs/0.14.1-incubating/comparisons/druid-vs-kudu.html
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--- a/docs/0.14.1-incubating/comparisons/druid-vs-kudu.html
+++ b/docs/0.14.1-incubating/comparisons/druid-vs-kudu.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -184,7 +184,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.1-incubating/comparisons/druid-vs-redshift.html b/docs/0.14.1-incubating/comparisons/druid-vs-redshift.html
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+++ b/docs/0.14.1-incubating/comparisons/druid-vs-redshift.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -209,7 +209,7 @@
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     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.1-incubating/comparisons/druid-vs-spark.html b/docs/0.14.1-incubating/comparisons/druid-vs-spark.html
index afa1db1..357ae14 100644
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+++ b/docs/0.14.1-incubating/comparisons/druid-vs-spark.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -187,7 +187,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.1-incubating/comparisons/druid-vs-sql-on-hadoop.html b/docs/0.14.1-incubating/comparisons/druid-vs-sql-on-hadoop.html
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+++ b/docs/0.14.1-incubating/comparisons/druid-vs-sql-on-hadoop.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -231,7 +231,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
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diff --git a/docs/0.14.1-incubating/configuration/index.html b/docs/0.14.1-incubating/configuration/index.html
index 5f56603..37deedb 100644
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-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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@@ -4387,7 +4387,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
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diff --git a/docs/0.14.1-incubating/configuration/logging.html b/docs/0.14.1-incubating/configuration/logging.html
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-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
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diff --git a/docs/0.14.1-incubating/configuration/realtime.html b/docs/0.14.1-incubating/configuration/realtime.html
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-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
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-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
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diff --git a/docs/0.14.1-incubating/dependencies/cassandra-deep-storage.html b/docs/0.14.1-incubating/dependencies/cassandra-deep-storage.html
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
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-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
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     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.1-incubating/dependencies/deep-storage.html b/docs/0.14.1-incubating/dependencies/deep-storage.html
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-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
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diff --git a/docs/0.14.1-incubating/dependencies/metadata-storage.html b/docs/0.14.1-incubating/dependencies/metadata-storage.html
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
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-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
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-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
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diff --git a/docs/0.14.1-incubating/design/auth.html b/docs/0.14.1-incubating/design/auth.html
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
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-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
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diff --git a/docs/0.14.1-incubating/design/broker.html b/docs/0.14.1-incubating/design/broker.html
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
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diff --git a/docs/0.14.1-incubating/design/coordinator.html b/docs/0.14.1-incubating/design/coordinator.html
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
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diff --git a/docs/0.14.1-incubating/design/historical.html b/docs/0.14.1-incubating/design/historical.html
index fa7753c..7e29f06 100644
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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@@ -200,7 +200,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.1-incubating/design/index.html b/docs/0.14.1-incubating/design/index.html
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--- a/docs/0.14.1-incubating/design/index.html
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
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     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.1-incubating/design/indexing-service.html b/docs/0.14.1-incubating/design/indexing-service.html
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
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diff --git a/docs/0.14.1-incubating/design/middlemanager.html b/docs/0.14.1-incubating/design/middlemanager.html
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--- a/docs/0.14.1-incubating/design/middlemanager.html
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.1-incubating/design/overlord.html b/docs/0.14.1-incubating/design/overlord.html
index 81d6320..4480dd1 100644
--- a/docs/0.14.1-incubating/design/overlord.html
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.1-incubating/design/peons.html b/docs/0.14.1-incubating/design/peons.html
index cbf060b..e1228a9 100644
--- a/docs/0.14.1-incubating/design/peons.html
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.1-incubating/design/plumber.html b/docs/0.14.1-incubating/design/plumber.html
index a9a6b07..56f7b8d 100644
--- a/docs/0.14.1-incubating/design/plumber.html
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.1-incubating/design/processes.html b/docs/0.14.1-incubating/design/processes.html
index 9620c67..ac0c7c5 100644
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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@@ -279,7 +279,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.1-incubating/design/realtime.html b/docs/0.14.1-incubating/design/realtime.html
index f1b1cdf..0eb99e7 100644
--- a/docs/0.14.1-incubating/design/realtime.html
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.1-incubating/design/segments.html b/docs/0.14.1-incubating/design/segments.html
index f97bff1..14f2963 100644
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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@@ -343,7 +343,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.1-incubating/development/build.html b/docs/0.14.1-incubating/development/build.html
index e3216bd..fcea841 100644
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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@@ -204,7 +204,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.1-incubating/development/experimental.html b/docs/0.14.1-incubating/development/experimental.html
index 6326c7e..2417a03 100644
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.1-incubating/development/extensions-contrib/ambari-metrics-emitter.html b/docs/0.14.1-incubating/development/extensions-contrib/ambari-metrics-emitter.html
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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@@ -308,7 +308,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.1-incubating/development/extensions-contrib/azure.html b/docs/0.14.1-incubating/development/extensions-contrib/azure.html
index 2f634d8..77db136 100644
--- a/docs/0.14.1-incubating/development/extensions-contrib/azure.html
+++ b/docs/0.14.1-incubating/development/extensions-contrib/azure.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -332,7 +332,7 @@
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     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.1-incubating/development/extensions-contrib/cassandra.html b/docs/0.14.1-incubating/development/extensions-contrib/cassandra.html
index d610863..1f96ebc 100644
--- a/docs/0.14.1-incubating/development/extensions-contrib/cassandra.html
+++ b/docs/0.14.1-incubating/development/extensions-contrib/cassandra.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -175,7 +175,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.1-incubating/development/extensions-contrib/cloudfiles.html b/docs/0.14.1-incubating/development/extensions-contrib/cloudfiles.html
index e8fc3ac..bdcf2d4 100644
--- a/docs/0.14.1-incubating/development/extensions-contrib/cloudfiles.html
+++ b/docs/0.14.1-incubating/development/extensions-contrib/cloudfiles.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -350,7 +350,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.1-incubating/development/extensions-contrib/distinctcount.html b/docs/0.14.1-incubating/development/extensions-contrib/distinctcount.html
index 987beb6..687f295 100644
--- a/docs/0.14.1-incubating/development/extensions-contrib/distinctcount.html
+++ b/docs/0.14.1-incubating/development/extensions-contrib/distinctcount.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -235,7 +235,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.1-incubating/development/extensions-contrib/google.html b/docs/0.14.1-incubating/development/extensions-contrib/google.html
index 223a217..49a64b1 100644
--- a/docs/0.14.1-incubating/development/extensions-contrib/google.html
+++ b/docs/0.14.1-incubating/development/extensions-contrib/google.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -310,7 +310,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.1-incubating/development/extensions-contrib/graphite.html b/docs/0.14.1-incubating/development/extensions-contrib/graphite.html
index bfe7b79..ecdc551 100644
--- a/docs/0.14.1-incubating/development/extensions-contrib/graphite.html
+++ b/docs/0.14.1-incubating/development/extensions-contrib/graphite.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -315,7 +315,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.1-incubating/development/extensions-contrib/influx.html b/docs/0.14.1-incubating/development/extensions-contrib/influx.html
index 06435dc..17abc18 100644
--- a/docs/0.14.1-incubating/development/extensions-contrib/influx.html
+++ b/docs/0.14.1-incubating/development/extensions-contrib/influx.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -210,7 +210,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.1-incubating/development/extensions-contrib/kafka-emitter.html b/docs/0.14.1-incubating/development/extensions-contrib/kafka-emitter.html
index e14c85b..1dfc388 100644
--- a/docs/0.14.1-incubating/development/extensions-contrib/kafka-emitter.html
+++ b/docs/0.14.1-incubating/development/extensions-contrib/kafka-emitter.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -228,7 +228,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.1-incubating/development/extensions-contrib/kafka-simple.html b/docs/0.14.1-incubating/development/extensions-contrib/kafka-simple.html
index 73daea6..c18b28c 100644
--- a/docs/0.14.1-incubating/development/extensions-contrib/kafka-simple.html
+++ b/docs/0.14.1-incubating/development/extensions-contrib/kafka-simple.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -231,7 +231,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.1-incubating/development/extensions-contrib/materialized-view.html b/docs/0.14.1-incubating/development/extensions-contrib/materialized-view.html
index 2f19bcd..b90eac7 100644
--- a/docs/0.14.1-incubating/development/extensions-contrib/materialized-view.html
+++ b/docs/0.14.1-incubating/development/extensions-contrib/materialized-view.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -345,7 +345,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.1-incubating/development/extensions-contrib/opentsdb-emitter.html b/docs/0.14.1-incubating/development/extensions-contrib/opentsdb-emitter.html
index 33bddbb..ff7f25d 100644
--- a/docs/0.14.1-incubating/development/extensions-contrib/opentsdb-emitter.html
+++ b/docs/0.14.1-incubating/development/extensions-contrib/opentsdb-emitter.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -250,7 +250,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.1-incubating/development/extensions-contrib/orc.html b/docs/0.14.1-incubating/development/extensions-contrib/orc.html
index a752ece..e35e8c6 100644
--- a/docs/0.14.1-incubating/development/extensions-contrib/orc.html
+++ b/docs/0.14.1-incubating/development/extensions-contrib/orc.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -281,7 +281,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.1-incubating/development/extensions-contrib/rabbitmq.html b/docs/0.14.1-incubating/development/extensions-contrib/rabbitmq.html
index b4b916a..890443f 100644
--- a/docs/0.14.1-incubating/development/extensions-contrib/rabbitmq.html
+++ b/docs/0.14.1-incubating/development/extensions-contrib/rabbitmq.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -309,7 +309,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.1-incubating/development/extensions-contrib/redis-cache.html b/docs/0.14.1-incubating/development/extensions-contrib/redis-cache.html
index e1e44a7..c026213 100644
--- a/docs/0.14.1-incubating/development/extensions-contrib/redis-cache.html
+++ b/docs/0.14.1-incubating/development/extensions-contrib/redis-cache.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -255,7 +255,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.1-incubating/development/extensions-contrib/rocketmq.html b/docs/0.14.1-incubating/development/extensions-contrib/rocketmq.html
index 8b844a4..da8c654 100644
--- a/docs/0.14.1-incubating/development/extensions-contrib/rocketmq.html
+++ b/docs/0.14.1-incubating/development/extensions-contrib/rocketmq.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -173,7 +173,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.1-incubating/development/extensions-contrib/sqlserver.html b/docs/0.14.1-incubating/development/extensions-contrib/sqlserver.html
index fc054ff..e6ff0e8 100644
--- a/docs/0.14.1-incubating/development/extensions-contrib/sqlserver.html
+++ b/docs/0.14.1-incubating/development/extensions-contrib/sqlserver.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -203,7 +203,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.1-incubating/development/extensions-contrib/statsd.html b/docs/0.14.1-incubating/development/extensions-contrib/statsd.html
index 9a56d3a..e39b00d 100644
--- a/docs/0.14.1-incubating/development/extensions-contrib/statsd.html
+++ b/docs/0.14.1-incubating/development/extensions-contrib/statsd.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -266,7 +266,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.1-incubating/development/extensions-contrib/thrift.html b/docs/0.14.1-incubating/development/extensions-contrib/thrift.html
index f580c8c..f4d252f 100644
--- a/docs/0.14.1-incubating/development/extensions-contrib/thrift.html
+++ b/docs/0.14.1-incubating/development/extensions-contrib/thrift.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -292,7 +292,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.1-incubating/development/extensions-contrib/time-min-max.html b/docs/0.14.1-incubating/development/extensions-contrib/time-min-max.html
index 6fa34c1..e6a001f 100644
--- a/docs/0.14.1-incubating/development/extensions-contrib/time-min-max.html
+++ b/docs/0.14.1-incubating/development/extensions-contrib/time-min-max.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -234,7 +234,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.1-incubating/development/extensions-core/approximate-histograms.html b/docs/0.14.1-incubating/development/extensions-core/approximate-histograms.html
index dac57b0..5af7a77 100644
--- a/docs/0.14.1-incubating/development/extensions-core/approximate-histograms.html
+++ b/docs/0.14.1-incubating/development/extensions-core/approximate-histograms.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -486,7 +486,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.1-incubating/development/extensions-core/avro.html b/docs/0.14.1-incubating/development/extensions-core/avro.html
index 814dcb1..3f31efb 100644
--- a/docs/0.14.1-incubating/development/extensions-core/avro.html
+++ b/docs/0.14.1-incubating/development/extensions-core/avro.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -474,7 +474,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.1-incubating/development/extensions-core/bloom-filter.html b/docs/0.14.1-incubating/development/extensions-core/bloom-filter.html
index b47dc9e..b687be9 100644
--- a/docs/0.14.1-incubating/development/extensions-core/bloom-filter.html
+++ b/docs/0.14.1-incubating/development/extensions-core/bloom-filter.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -345,7 +345,7 @@
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     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.1-incubating/development/extensions-core/datasketches-extension.html b/docs/0.14.1-incubating/development/extensions-core/datasketches-extension.html
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--- a/docs/0.14.1-incubating/development/extensions-core/datasketches-extension.html
+++ b/docs/0.14.1-incubating/development/extensions-core/datasketches-extension.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -183,7 +183,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.1-incubating/development/extensions-core/datasketches-hll.html b/docs/0.14.1-incubating/development/extensions-core/datasketches-hll.html
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--- a/docs/0.14.1-incubating/development/extensions-core/datasketches-hll.html
+++ b/docs/0.14.1-incubating/development/extensions-core/datasketches-hll.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -253,7 +253,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.1-incubating/development/extensions-core/datasketches-quantiles.html b/docs/0.14.1-incubating/development/extensions-core/datasketches-quantiles.html
index b8b7304..2c63262 100644
--- a/docs/0.14.1-incubating/development/extensions-core/datasketches-quantiles.html
+++ b/docs/0.14.1-incubating/development/extensions-core/datasketches-quantiles.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -262,7 +262,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.1-incubating/development/extensions-core/datasketches-theta.html b/docs/0.14.1-incubating/development/extensions-core/datasketches-theta.html
index a277c3b..98c5e01 100644
--- a/docs/0.14.1-incubating/development/extensions-core/datasketches-theta.html
+++ b/docs/0.14.1-incubating/development/extensions-core/datasketches-theta.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -416,7 +416,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.1-incubating/development/extensions-core/datasketches-tuple.html b/docs/0.14.1-incubating/development/extensions-core/datasketches-tuple.html
index aa971fd..424fb63 100644
--- a/docs/0.14.1-incubating/development/extensions-core/datasketches-tuple.html
+++ b/docs/0.14.1-incubating/development/extensions-core/datasketches-tuple.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -318,7 +318,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.1-incubating/development/extensions-core/druid-basic-security.html b/docs/0.14.1-incubating/development/extensions-core/druid-basic-security.html
index 18f5a8a..8f1b3cc 100644
--- a/docs/0.14.1-incubating/development/extensions-core/druid-basic-security.html
+++ b/docs/0.14.1-incubating/development/extensions-core/druid-basic-security.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -660,7 +660,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.1-incubating/development/extensions-core/druid-kerberos.html b/docs/0.14.1-incubating/development/extensions-core/druid-kerberos.html
index a51e9d0..ce0aafb 100644
--- a/docs/0.14.1-incubating/development/extensions-core/druid-kerberos.html
+++ b/docs/0.14.1-incubating/development/extensions-core/druid-kerberos.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -347,7 +347,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.1-incubating/development/extensions-core/druid-lookups.html b/docs/0.14.1-incubating/development/extensions-core/druid-lookups.html
index 222610e..ecd2a27 100644
--- a/docs/0.14.1-incubating/development/extensions-core/druid-lookups.html
+++ b/docs/0.14.1-incubating/development/extensions-core/druid-lookups.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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@@ -407,7 +407,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.1-incubating/development/extensions-core/examples.html b/docs/0.14.1-incubating/development/extensions-core/examples.html
index 04df61e..a64aab3 100644
--- a/docs/0.14.1-incubating/development/extensions-core/examples.html
+++ b/docs/0.14.1-incubating/development/extensions-core/examples.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -208,7 +208,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.1-incubating/development/extensions-core/hdfs.html b/docs/0.14.1-incubating/development/extensions-core/hdfs.html
index 81685e1..36fc1af 100644
--- a/docs/0.14.1-incubating/development/extensions-core/hdfs.html
+++ b/docs/0.14.1-incubating/development/extensions-core/hdfs.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -244,7 +244,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.1-incubating/development/extensions-core/kafka-eight-firehose.html b/docs/0.14.1-incubating/development/extensions-core/kafka-eight-firehose.html
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--- a/docs/0.14.1-incubating/development/extensions-core/kafka-eight-firehose.html
+++ b/docs/0.14.1-incubating/development/extensions-core/kafka-eight-firehose.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -213,7 +213,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.1-incubating/development/extensions-core/kafka-extraction-namespace.html b/docs/0.14.1-incubating/development/extensions-core/kafka-extraction-namespace.html
index 52f9853..deb909b 100644
--- a/docs/0.14.1-incubating/development/extensions-core/kafka-extraction-namespace.html
+++ b/docs/0.14.1-incubating/development/extensions-core/kafka-extraction-namespace.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -235,7 +235,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.1-incubating/development/extensions-core/kafka-ingestion.html b/docs/0.14.1-incubating/development/extensions-core/kafka-ingestion.html
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--- a/docs/0.14.1-incubating/development/extensions-core/kafka-ingestion.html
+++ b/docs/0.14.1-incubating/development/extensions-core/kafka-ingestion.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -763,7 +763,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.1-incubating/development/extensions-core/kinesis-ingestion.html b/docs/0.14.1-incubating/development/extensions-core/kinesis-ingestion.html
index 78800ab..412f640 100644
--- a/docs/0.14.1-incubating/development/extensions-core/kinesis-ingestion.html
+++ b/docs/0.14.1-incubating/development/extensions-core/kinesis-ingestion.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -859,7 +859,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.1-incubating/development/extensions-core/lookups-cached-global.html b/docs/0.14.1-incubating/development/extensions-core/lookups-cached-global.html
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+++ b/docs/0.14.1-incubating/development/extensions-core/lookups-cached-global.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -691,7 +691,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.1-incubating/development/extensions-core/mysql.html b/docs/0.14.1-incubating/development/extensions-core/mysql.html
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--- a/docs/0.14.1-incubating/development/extensions-core/mysql.html
+++ b/docs/0.14.1-incubating/development/extensions-core/mysql.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -310,7 +310,7 @@
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     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.1-incubating/development/extensions-core/parquet.html b/docs/0.14.1-incubating/development/extensions-core/parquet.html
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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@@ -378,7 +378,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.1-incubating/development/extensions-core/postgresql.html b/docs/0.14.1-incubating/development/extensions-core/postgresql.html
index 1597829..993dd16 100644
--- a/docs/0.14.1-incubating/development/extensions-core/postgresql.html
+++ b/docs/0.14.1-incubating/development/extensions-core/postgresql.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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@@ -284,7 +284,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.1-incubating/development/extensions-core/protobuf.html b/docs/0.14.1-incubating/development/extensions-core/protobuf.html
index 5d46591..df4656c 100644
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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@@ -384,7 +384,7 @@
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-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.1-incubating/development/extensions-core/s3.html b/docs/0.14.1-incubating/development/extensions-core/s3.html
index 26992a2..75bb99f 100644
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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@@ -364,7 +364,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.1-incubating/development/extensions-core/simple-client-sslcontext.html b/docs/0.14.1-incubating/development/extensions-core/simple-client-sslcontext.html
index 0fe11d5..6af5eb9 100644
--- a/docs/0.14.1-incubating/development/extensions-core/simple-client-sslcontext.html
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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@@ -272,7 +272,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.1-incubating/development/extensions-core/stats.html b/docs/0.14.1-incubating/development/extensions-core/stats.html
index ec77db8..cc362c3 100644
--- a/docs/0.14.1-incubating/development/extensions-core/stats.html
+++ b/docs/0.14.1-incubating/development/extensions-core/stats.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -307,7 +307,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.1-incubating/development/extensions-core/test-stats.html b/docs/0.14.1-incubating/development/extensions-core/test-stats.html
index fbf647d..9e58beb 100644
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -259,7 +259,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.1-incubating/development/extensions.html b/docs/0.14.1-incubating/development/extensions.html
index 010d200..487bada 100644
--- a/docs/0.14.1-incubating/development/extensions.html
+++ b/docs/0.14.1-incubating/development/extensions.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -417,7 +417,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.1-incubating/development/geo.html b/docs/0.14.1-incubating/development/geo.html
index 35075a4..1bd7439 100644
--- a/docs/0.14.1-incubating/development/geo.html
+++ b/docs/0.14.1-incubating/development/geo.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -274,7 +274,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.1-incubating/development/integrating-druid-with-other-technologies.html b/docs/0.14.1-incubating/development/integrating-druid-with-other-technologies.html
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+++ b/docs/0.14.1-incubating/development/integrating-druid-with-other-technologies.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -183,7 +183,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.1-incubating/development/javascript.html b/docs/0.14.1-incubating/development/javascript.html
index 44e5c94..fb3b302 100644
--- a/docs/0.14.1-incubating/development/javascript.html
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -221,7 +221,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.1-incubating/development/modules.html b/docs/0.14.1-incubating/development/modules.html
index d1bdd8d..3f75fb8 100644
--- a/docs/0.14.1-incubating/development/modules.html
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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@@ -410,7 +410,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
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diff --git a/docs/0.14.1-incubating/development/overview.html b/docs/0.14.1-incubating/development/overview.html
index 715d788..8a7c426 100644
--- a/docs/0.14.1-incubating/development/overview.html
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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@@ -220,7 +220,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
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diff --git a/docs/0.14.1-incubating/development/router.html b/docs/0.14.1-incubating/development/router.html
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--- a/docs/0.14.1-incubating/development/router.html
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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@@ -431,7 +431,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
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diff --git a/docs/0.14.1-incubating/development/versioning.html b/docs/0.14.1-incubating/development/versioning.html
index 3b2ac0e..9aa760b 100644
--- a/docs/0.14.1-incubating/development/versioning.html
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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@@ -191,7 +191,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.1-incubating/ingestion/batch-ingestion.html b/docs/0.14.1-incubating/ingestion/batch-ingestion.html
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+++ b/docs/0.14.1-incubating/ingestion/batch-ingestion.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -183,7 +183,7 @@
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     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.1-incubating/ingestion/command-line-hadoop-indexer.html b/docs/0.14.1-incubating/ingestion/command-line-hadoop-indexer.html
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -288,7 +288,7 @@
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     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.1-incubating/ingestion/compaction.html b/docs/0.14.1-incubating/ingestion/compaction.html
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--- a/docs/0.14.1-incubating/ingestion/compaction.html
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -322,7 +322,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.1-incubating/ingestion/data-formats.html b/docs/0.14.1-incubating/ingestion/data-formats.html
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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@@ -325,7 +325,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.1-incubating/ingestion/delete-data.html b/docs/0.14.1-incubating/ingestion/delete-data.html
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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@@ -193,7 +193,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.1-incubating/ingestion/faq.html b/docs/0.14.1-incubating/ingestion/faq.html
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-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -247,7 +247,7 @@
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-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
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-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
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-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
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-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
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-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
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-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
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-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
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-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
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-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
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-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
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-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
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-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
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-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
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-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
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-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
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-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
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-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
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     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.1-incubating/ingestion/update-existing-data.html b/docs/0.14.1-incubating/ingestion/update-existing-data.html
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-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
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-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
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-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
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diff --git a/docs/0.14.1-incubating/misc/papers-and-talks.html b/docs/0.14.1-incubating/misc/papers-and-talks.html
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-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.1-incubating/operations/alerts.html b/docs/0.14.1-incubating/operations/alerts.html
index 1e20295..fc4805c 100644
--- a/docs/0.14.1-incubating/operations/alerts.html
+++ b/docs/0.14.1-incubating/operations/alerts.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -184,7 +184,7 @@
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     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.1-incubating/operations/api-reference.html b/docs/0.14.1-incubating/operations/api-reference.html
index 7671c6e..79b69ef 100644
--- a/docs/0.14.1-incubating/operations/api-reference.html
+++ b/docs/0.14.1-incubating/operations/api-reference.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -1146,7 +1146,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.1-incubating/operations/druid-console.html b/docs/0.14.1-incubating/operations/druid-console.html
index 8b6fcc0..8ed232c 100644
--- a/docs/0.14.1-incubating/operations/druid-console.html
+++ b/docs/0.14.1-incubating/operations/druid-console.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -232,7 +232,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.1-incubating/operations/dump-segment.html b/docs/0.14.1-incubating/operations/dump-segment.html
index f1df1e0..29f0556 100644
--- a/docs/0.14.1-incubating/operations/dump-segment.html
+++ b/docs/0.14.1-incubating/operations/dump-segment.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -285,7 +285,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.1-incubating/operations/http-compression.html b/docs/0.14.1-incubating/operations/http-compression.html
index d0b305d..2065460 100644
--- a/docs/0.14.1-incubating/operations/http-compression.html
+++ b/docs/0.14.1-incubating/operations/http-compression.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -192,7 +192,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.1-incubating/operations/including-extensions.html b/docs/0.14.1-incubating/operations/including-extensions.html
index e7add4d..80fd34c 100644
--- a/docs/0.14.1-incubating/operations/including-extensions.html
+++ b/docs/0.14.1-incubating/operations/including-extensions.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -224,7 +224,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.1-incubating/operations/insert-segment-to-db.html b/docs/0.14.1-incubating/operations/insert-segment-to-db.html
index b85b8a5..6834f89 100644
--- a/docs/0.14.1-incubating/operations/insert-segment-to-db.html
+++ b/docs/0.14.1-incubating/operations/insert-segment-to-db.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -285,7 +285,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.1-incubating/operations/management-uis.html b/docs/0.14.1-incubating/operations/management-uis.html
index 2e23b2b..25c9f47 100644
--- a/docs/0.14.1-incubating/operations/management-uis.html
+++ b/docs/0.14.1-incubating/operations/management-uis.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -214,7 +214,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.1-incubating/operations/metrics.html b/docs/0.14.1-incubating/operations/metrics.html
index d9d600d..f4a4e6f 100644
--- a/docs/0.14.1-incubating/operations/metrics.html
+++ b/docs/0.14.1-incubating/operations/metrics.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -1178,7 +1178,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.1-incubating/operations/other-hadoop.html b/docs/0.14.1-incubating/operations/other-hadoop.html
index 7827948..59f4892 100644
--- a/docs/0.14.1-incubating/operations/other-hadoop.html
+++ b/docs/0.14.1-incubating/operations/other-hadoop.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -431,7 +431,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.1-incubating/operations/password-provider.html b/docs/0.14.1-incubating/operations/password-provider.html
index 0891c1e..4df9c3b 100644
--- a/docs/0.14.1-incubating/operations/password-provider.html
+++ b/docs/0.14.1-incubating/operations/password-provider.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -210,7 +210,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.1-incubating/operations/performance-faq.html b/docs/0.14.1-incubating/operations/performance-faq.html
index d41131e..95f07e5 100644
--- a/docs/0.14.1-incubating/operations/performance-faq.html
+++ b/docs/0.14.1-incubating/operations/performance-faq.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -240,7 +240,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.1-incubating/operations/pull-deps.html b/docs/0.14.1-incubating/operations/pull-deps.html
index 4d7c49c..8986a61 100644
--- a/docs/0.14.1-incubating/operations/pull-deps.html
+++ b/docs/0.14.1-incubating/operations/pull-deps.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -283,7 +283,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.1-incubating/operations/recommendations.html b/docs/0.14.1-incubating/operations/recommendations.html
index 50c7570..81b82d2 100644
--- a/docs/0.14.1-incubating/operations/recommendations.html
+++ b/docs/0.14.1-incubating/operations/recommendations.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -235,7 +235,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.1-incubating/operations/reset-cluster.html b/docs/0.14.1-incubating/operations/reset-cluster.html
index 0238a23..2ad4bb1 100644
--- a/docs/0.14.1-incubating/operations/reset-cluster.html
+++ b/docs/0.14.1-incubating/operations/reset-cluster.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -209,7 +209,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.1-incubating/operations/rolling-updates.html b/docs/0.14.1-incubating/operations/rolling-updates.html
index bbee308..64fc753 100644
--- a/docs/0.14.1-incubating/operations/rolling-updates.html
+++ b/docs/0.14.1-incubating/operations/rolling-updates.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -248,7 +248,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.1-incubating/operations/rule-configuration.html b/docs/0.14.1-incubating/operations/rule-configuration.html
index bf241e1..4daf1c3 100644
--- a/docs/0.14.1-incubating/operations/rule-configuration.html
+++ b/docs/0.14.1-incubating/operations/rule-configuration.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -371,7 +371,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.1-incubating/operations/segment-optimization.html b/docs/0.14.1-incubating/operations/segment-optimization.html
index 4908804..c4e3edb 100644
--- a/docs/0.14.1-incubating/operations/segment-optimization.html
+++ b/docs/0.14.1-incubating/operations/segment-optimization.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -247,7 +247,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.1-incubating/operations/tls-support.html b/docs/0.14.1-incubating/operations/tls-support.html
index af5f1b8..93fd09c 100644
--- a/docs/0.14.1-incubating/operations/tls-support.html
+++ b/docs/0.14.1-incubating/operations/tls-support.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -382,7 +382,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.1-incubating/operations/use_sbt_to_build_fat_jar.html b/docs/0.14.1-incubating/operations/use_sbt_to_build_fat_jar.html
index 88df914..7bad2ed 100644
--- a/docs/0.14.1-incubating/operations/use_sbt_to_build_fat_jar.html
+++ b/docs/0.14.1-incubating/operations/use_sbt_to_build_fat_jar.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -269,7 +269,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.1-incubating/querying/aggregations.html b/docs/0.14.1-incubating/querying/aggregations.html
index a9ae54a..511172a 100644
--- a/docs/0.14.1-incubating/querying/aggregations.html
+++ b/docs/0.14.1-incubating/querying/aggregations.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -443,7 +443,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.1-incubating/querying/caching.html b/docs/0.14.1-incubating/querying/caching.html
index 6919c31..2345c4c 100644
--- a/docs/0.14.1-incubating/querying/caching.html
+++ b/docs/0.14.1-incubating/querying/caching.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -190,7 +190,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.1-incubating/querying/datasource.html b/docs/0.14.1-incubating/querying/datasource.html
index b8cd3b7..cdeaf56 100644
--- a/docs/0.14.1-incubating/querying/datasource.html
+++ b/docs/0.14.1-incubating/querying/datasource.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -201,7 +201,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.1-incubating/querying/datasourcemetadataquery.html b/docs/0.14.1-incubating/querying/datasourcemetadataquery.html
index 2b17130..f77affa 100644
--- a/docs/0.14.1-incubating/querying/datasourcemetadataquery.html
+++ b/docs/0.14.1-incubating/querying/datasourcemetadataquery.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -215,7 +215,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.1-incubating/querying/dimensionspecs.html b/docs/0.14.1-incubating/querying/dimensionspecs.html
index 12b6b39..c71ae60 100644
--- a/docs/0.14.1-incubating/querying/dimensionspecs.html
+++ b/docs/0.14.1-incubating/querying/dimensionspecs.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -627,7 +627,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.1-incubating/querying/filters.html b/docs/0.14.1-incubating/querying/filters.html
index e9af76a..7a08268 100644
--- a/docs/0.14.1-incubating/querying/filters.html
+++ b/docs/0.14.1-incubating/querying/filters.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -778,7 +778,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.1-incubating/querying/granularities.html b/docs/0.14.1-incubating/querying/granularities.html
index ccb40c0..b6d3fbf 100644
--- a/docs/0.14.1-incubating/querying/granularities.html
+++ b/docs/0.14.1-incubating/querying/granularities.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -527,7 +527,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.1-incubating/querying/groupbyquery.html b/docs/0.14.1-incubating/querying/groupbyquery.html
index 106fb7f..65a578a 100644
--- a/docs/0.14.1-incubating/querying/groupbyquery.html
+++ b/docs/0.14.1-incubating/querying/groupbyquery.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -774,7 +774,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.1-incubating/querying/having.html b/docs/0.14.1-incubating/querying/having.html
index b87ffc5..e6301e6 100644
--- a/docs/0.14.1-incubating/querying/having.html
+++ b/docs/0.14.1-incubating/querying/having.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -371,7 +371,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.1-incubating/querying/hll-old.html b/docs/0.14.1-incubating/querying/hll-old.html
index 2d8b287..dc61deb 100644
--- a/docs/0.14.1-incubating/querying/hll-old.html
+++ b/docs/0.14.1-incubating/querying/hll-old.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -265,7 +265,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.1-incubating/querying/joins.html b/docs/0.14.1-incubating/querying/joins.html
index 88e72dc..d914c31 100644
--- a/docs/0.14.1-incubating/querying/joins.html
+++ b/docs/0.14.1-incubating/querying/joins.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -201,7 +201,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.1-incubating/querying/limitspec.html b/docs/0.14.1-incubating/querying/limitspec.html
index b534f6f..ee0418b 100644
--- a/docs/0.14.1-incubating/querying/limitspec.html
+++ b/docs/0.14.1-incubating/querying/limitspec.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -193,7 +193,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.1-incubating/querying/lookups.html b/docs/0.14.1-incubating/querying/lookups.html
index 4a2249e..3b37dad 100644
--- a/docs/0.14.1-incubating/querying/lookups.html
+++ b/docs/0.14.1-incubating/querying/lookups.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -644,7 +644,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.1-incubating/querying/multi-value-dimensions.html b/docs/0.14.1-incubating/querying/multi-value-dimensions.html
index 3a42001..fa79d8b 100644
--- a/docs/0.14.1-incubating/querying/multi-value-dimensions.html
+++ b/docs/0.14.1-incubating/querying/multi-value-dimensions.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -456,7 +456,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.1-incubating/querying/multitenancy.html b/docs/0.14.1-incubating/querying/multitenancy.html
index 0ea41d4..1351bbb 100644
--- a/docs/0.14.1-incubating/querying/multitenancy.html
+++ b/docs/0.14.1-incubating/querying/multitenancy.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -249,7 +249,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.1-incubating/querying/post-aggregations.html b/docs/0.14.1-incubating/querying/post-aggregations.html
index 3248392..773876a 100644
--- a/docs/0.14.1-incubating/querying/post-aggregations.html
+++ b/docs/0.14.1-incubating/querying/post-aggregations.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -336,7 +336,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.1-incubating/querying/query-context.html b/docs/0.14.1-incubating/querying/query-context.html
index 778a80f..a9abd8d 100644
--- a/docs/0.14.1-incubating/querying/query-context.html
+++ b/docs/0.14.1-incubating/querying/query-context.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -288,7 +288,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.1-incubating/querying/querying.html b/docs/0.14.1-incubating/querying/querying.html
index bfca4fc..5d1dedb 100644
--- a/docs/0.14.1-incubating/querying/querying.html
+++ b/docs/0.14.1-incubating/querying/querying.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -300,7 +300,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.1-incubating/querying/scan-query.html b/docs/0.14.1-incubating/querying/scan-query.html
index 8196b70..7261ba0 100644
--- a/docs/0.14.1-incubating/querying/scan-query.html
+++ b/docs/0.14.1-incubating/querying/scan-query.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -379,7 +379,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.1-incubating/querying/searchquery.html b/docs/0.14.1-incubating/querying/searchquery.html
index 4ed9c40..ddb10e5 100644
--- a/docs/0.14.1-incubating/querying/searchquery.html
+++ b/docs/0.14.1-incubating/querying/searchquery.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -343,7 +343,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.1-incubating/querying/searchqueryspec.html b/docs/0.14.1-incubating/querying/searchqueryspec.html
index 8b40b24..338b00d 100644
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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@@ -205,7 +205,7 @@
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-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.1-incubating/querying/segmentmetadataquery.html b/docs/0.14.1-incubating/querying/segmentmetadataquery.html
index 3ac21f1..3785174 100644
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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@@ -371,7 +371,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.1-incubating/querying/select-query.html b/docs/0.14.1-incubating/querying/select-query.html
index 5afff5c..fb5742d 100644
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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@@ -437,7 +437,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.1-incubating/querying/sorting-orders.html b/docs/0.14.1-incubating/querying/sorting-orders.html
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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@@ -203,7 +203,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.1-incubating/querying/sql.html b/docs/0.14.1-incubating/querying/sql.html
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--- a/docs/0.14.1-incubating/querying/sql.html
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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@@ -1596,7 +1596,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.1-incubating/querying/timeboundaryquery.html b/docs/0.14.1-incubating/querying/timeboundaryquery.html
index 1530ac2..5570409 100644
--- a/docs/0.14.1-incubating/querying/timeboundaryquery.html
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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@@ -222,7 +222,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.1-incubating/querying/timeseriesquery.html b/docs/0.14.1-incubating/querying/timeseriesquery.html
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -334,7 +334,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.1-incubating/querying/topnmetricspec.html b/docs/0.14.1-incubating/querying/topnmetricspec.html
index ed5766e..550718a 100644
--- a/docs/0.14.1-incubating/querying/topnmetricspec.html
+++ b/docs/0.14.1-incubating/querying/topnmetricspec.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -269,7 +269,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.1-incubating/querying/topnquery.html b/docs/0.14.1-incubating/querying/topnquery.html
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+++ b/docs/0.14.1-incubating/querying/topnquery.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -439,7 +439,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.1-incubating/querying/virtual-columns.html b/docs/0.14.1-incubating/querying/virtual-columns.html
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--- a/docs/0.14.1-incubating/querying/virtual-columns.html
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -235,7 +235,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.1-incubating/tutorials/cluster.html b/docs/0.14.1-incubating/tutorials/cluster.html
index bd71d95..1b149ab 100644
--- a/docs/0.14.1-incubating/tutorials/cluster.html
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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@@ -558,7 +558,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.1-incubating/tutorials/index.html b/docs/0.14.1-incubating/tutorials/index.html
index 4ddef4a..6abf928 100644
--- a/docs/0.14.1-incubating/tutorials/index.html
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -334,7 +334,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.1-incubating/tutorials/tutorial-batch-hadoop.html b/docs/0.14.1-incubating/tutorials/tutorial-batch-hadoop.html
index be230b2..5bd10a8 100644
--- a/docs/0.14.1-incubating/tutorials/tutorial-batch-hadoop.html
+++ b/docs/0.14.1-incubating/tutorials/tutorial-batch-hadoop.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -357,7 +357,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.1-incubating/tutorials/tutorial-batch.html b/docs/0.14.1-incubating/tutorials/tutorial-batch.html
index e5d1441..3bd4f28 100644
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+++ b/docs/0.14.1-incubating/tutorials/tutorial-batch.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -308,7 +308,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.1-incubating/tutorials/tutorial-compaction.html b/docs/0.14.1-incubating/tutorials/tutorial-compaction.html
index a205b1a..d99ff21 100644
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+++ b/docs/0.14.1-incubating/tutorials/tutorial-compaction.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -298,7 +298,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.1-incubating/tutorials/tutorial-delete-data.html b/docs/0.14.1-incubating/tutorials/tutorial-delete-data.html
index 5d9d68e..d747eef 100644
--- a/docs/0.14.1-incubating/tutorials/tutorial-delete-data.html
+++ b/docs/0.14.1-incubating/tutorials/tutorial-delete-data.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -306,7 +306,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.1-incubating/tutorials/tutorial-ingestion-spec.html b/docs/0.14.1-incubating/tutorials/tutorial-ingestion-spec.html
index 42a0421..17a4414 100644
--- a/docs/0.14.1-incubating/tutorials/tutorial-ingestion-spec.html
+++ b/docs/0.14.1-incubating/tutorials/tutorial-ingestion-spec.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -745,7 +745,7 @@
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     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.1-incubating/tutorials/tutorial-kafka.html b/docs/0.14.1-incubating/tutorials/tutorial-kafka.html
index b326c64..f168dea 100644
--- a/docs/0.14.1-incubating/tutorials/tutorial-kafka.html
+++ b/docs/0.14.1-incubating/tutorials/tutorial-kafka.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -233,7 +233,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.1-incubating/tutorials/tutorial-query.html b/docs/0.14.1-incubating/tutorials/tutorial-query.html
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+++ b/docs/0.14.1-incubating/tutorials/tutorial-query.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -410,7 +410,7 @@
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     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.1-incubating/tutorials/tutorial-retention.html b/docs/0.14.1-incubating/tutorials/tutorial-retention.html
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+++ b/docs/0.14.1-incubating/tutorials/tutorial-retention.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -258,7 +258,7 @@
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     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.1-incubating/tutorials/tutorial-rollup.html b/docs/0.14.1-incubating/tutorials/tutorial-rollup.html
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
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diff --git a/docs/0.14.1-incubating/tutorials/tutorial-tranquility.html b/docs/0.14.1-incubating/tutorials/tutorial-tranquility.html
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-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
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     <a href="/downloads.html">Download</a>&ensp;·&ensp;
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diff --git a/docs/0.14.1-incubating/tutorials/tutorial-update-data.html b/docs/0.14.1-incubating/tutorials/tutorial-update-data.html
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
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-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
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diff --git a/docs/0.14.2-incubating/comparisons/druid-vs-elasticsearch.html b/docs/0.14.2-incubating/comparisons/druid-vs-elasticsearch.html
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
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-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
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     <a href="/downloads.html">Download</a>&ensp;·&ensp;
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diff --git a/docs/0.14.2-incubating/comparisons/druid-vs-key-value.html b/docs/0.14.2-incubating/comparisons/druid-vs-key-value.html
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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diff --git a/docs/0.14.2-incubating/comparisons/druid-vs-kudu.html b/docs/0.14.2-incubating/comparisons/druid-vs-kudu.html
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
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+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
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diff --git a/docs/0.14.2-incubating/comparisons/druid-vs-redshift.html b/docs/0.14.2-incubating/comparisons/druid-vs-redshift.html
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
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diff --git a/docs/0.14.2-incubating/comparisons/druid-vs-spark.html b/docs/0.14.2-incubating/comparisons/druid-vs-spark.html
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
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diff --git a/docs/0.14.2-incubating/comparisons/druid-vs-sql-on-hadoop.html b/docs/0.14.2-incubating/comparisons/druid-vs-sql-on-hadoop.html
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
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+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
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diff --git a/docs/0.14.2-incubating/configuration/index.html b/docs/0.14.2-incubating/configuration/index.html
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-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
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+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
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-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
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-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
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diff --git a/docs/0.14.2-incubating/dependencies/cassandra-deep-storage.html b/docs/0.14.2-incubating/dependencies/cassandra-deep-storage.html
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
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diff --git a/docs/0.14.2-incubating/dependencies/deep-storage.html b/docs/0.14.2-incubating/dependencies/deep-storage.html
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-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
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diff --git a/docs/0.14.2-incubating/dependencies/metadata-storage.html b/docs/0.14.2-incubating/dependencies/metadata-storage.html
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-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
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-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
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diff --git a/docs/0.14.2-incubating/design/auth.html b/docs/0.14.2-incubating/design/auth.html
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-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
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-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
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+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
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-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
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+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.2-incubating/design/historical.html b/docs/0.14.2-incubating/design/historical.html
index baa6674..17bffba 100644
--- a/docs/0.14.2-incubating/design/historical.html
+++ b/docs/0.14.2-incubating/design/historical.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -200,7 +200,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.2-incubating/design/index.html b/docs/0.14.2-incubating/design/index.html
index 812523d..b33c9da 100644
--- a/docs/0.14.2-incubating/design/index.html
+++ b/docs/0.14.2-incubating/design/index.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -369,7 +369,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.2-incubating/design/indexing-service.html b/docs/0.14.2-incubating/design/indexing-service.html
index f7477e0..52396bf 100644
--- a/docs/0.14.2-incubating/design/indexing-service.html
+++ b/docs/0.14.2-incubating/design/indexing-service.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -205,7 +205,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.2-incubating/design/middlemanager.html b/docs/0.14.2-incubating/design/middlemanager.html
index e26bd2c..7f849a8 100644
--- a/docs/0.14.2-incubating/design/middlemanager.html
+++ b/docs/0.14.2-incubating/design/middlemanager.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -185,7 +185,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.2-incubating/design/overlord.html b/docs/0.14.2-incubating/design/overlord.html
index 9e2ef6d..15fa503 100644
--- a/docs/0.14.2-incubating/design/overlord.html
+++ b/docs/0.14.2-incubating/design/overlord.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -204,7 +204,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.2-incubating/design/peons.html b/docs/0.14.2-incubating/design/peons.html
index bec856d..64e77e6 100644
--- a/docs/0.14.2-incubating/design/peons.html
+++ b/docs/0.14.2-incubating/design/peons.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -188,7 +188,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.2-incubating/design/plumber.html b/docs/0.14.2-incubating/design/plumber.html
index 13bcff9..8fd712b 100644
--- a/docs/0.14.2-incubating/design/plumber.html
+++ b/docs/0.14.2-incubating/design/plumber.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -181,7 +181,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.2-incubating/design/processes.html b/docs/0.14.2-incubating/design/processes.html
index b88a172..4c14aa8 100644
--- a/docs/0.14.2-incubating/design/processes.html
+++ b/docs/0.14.2-incubating/design/processes.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -279,7 +279,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.2-incubating/design/realtime.html b/docs/0.14.2-incubating/design/realtime.html
index 1ea460e..97c6324 100644
--- a/docs/0.14.2-incubating/design/realtime.html
+++ b/docs/0.14.2-incubating/design/realtime.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -223,7 +223,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.2-incubating/design/segments.html b/docs/0.14.2-incubating/design/segments.html
index 49d78f3..fd46ae8 100644
--- a/docs/0.14.2-incubating/design/segments.html
+++ b/docs/0.14.2-incubating/design/segments.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -343,7 +343,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.2-incubating/development/build.html b/docs/0.14.2-incubating/development/build.html
index df3227e..8be50bd 100644
--- a/docs/0.14.2-incubating/development/build.html
+++ b/docs/0.14.2-incubating/development/build.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -205,7 +205,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.2-incubating/development/experimental.html b/docs/0.14.2-incubating/development/experimental.html
index 660c156..bde9089 100644
--- a/docs/0.14.2-incubating/development/experimental.html
+++ b/docs/0.14.2-incubating/development/experimental.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -180,7 +180,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.2-incubating/development/extensions-contrib/ambari-metrics-emitter.html b/docs/0.14.2-incubating/development/extensions-contrib/ambari-metrics-emitter.html
index c3e9486..806960a 100644
--- a/docs/0.14.2-incubating/development/extensions-contrib/ambari-metrics-emitter.html
+++ b/docs/0.14.2-incubating/development/extensions-contrib/ambari-metrics-emitter.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -308,7 +308,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.2-incubating/development/extensions-contrib/azure.html b/docs/0.14.2-incubating/development/extensions-contrib/azure.html
index c7ac98c..581a677 100644
--- a/docs/0.14.2-incubating/development/extensions-contrib/azure.html
+++ b/docs/0.14.2-incubating/development/extensions-contrib/azure.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -332,7 +332,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.2-incubating/development/extensions-contrib/cassandra.html b/docs/0.14.2-incubating/development/extensions-contrib/cassandra.html
index 50f9296..8803247 100644
--- a/docs/0.14.2-incubating/development/extensions-contrib/cassandra.html
+++ b/docs/0.14.2-incubating/development/extensions-contrib/cassandra.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -175,7 +175,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.2-incubating/development/extensions-contrib/cloudfiles.html b/docs/0.14.2-incubating/development/extensions-contrib/cloudfiles.html
index 4e1c7a3..b6e64fb 100644
--- a/docs/0.14.2-incubating/development/extensions-contrib/cloudfiles.html
+++ b/docs/0.14.2-incubating/development/extensions-contrib/cloudfiles.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -350,7 +350,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.2-incubating/development/extensions-contrib/distinctcount.html b/docs/0.14.2-incubating/development/extensions-contrib/distinctcount.html
index 54e8928..45c908d 100644
--- a/docs/0.14.2-incubating/development/extensions-contrib/distinctcount.html
+++ b/docs/0.14.2-incubating/development/extensions-contrib/distinctcount.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -235,7 +235,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.2-incubating/development/extensions-contrib/google.html b/docs/0.14.2-incubating/development/extensions-contrib/google.html
index ea1e761..5b380d1 100644
--- a/docs/0.14.2-incubating/development/extensions-contrib/google.html
+++ b/docs/0.14.2-incubating/development/extensions-contrib/google.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -310,7 +310,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.2-incubating/development/extensions-contrib/graphite.html b/docs/0.14.2-incubating/development/extensions-contrib/graphite.html
index 1203e0f..d66a4c2 100644
--- a/docs/0.14.2-incubating/development/extensions-contrib/graphite.html
+++ b/docs/0.14.2-incubating/development/extensions-contrib/graphite.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -315,7 +315,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.2-incubating/development/extensions-contrib/influx.html b/docs/0.14.2-incubating/development/extensions-contrib/influx.html
index a0ec6e8..778ef16 100644
--- a/docs/0.14.2-incubating/development/extensions-contrib/influx.html
+++ b/docs/0.14.2-incubating/development/extensions-contrib/influx.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -210,7 +210,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.2-incubating/development/extensions-contrib/kafka-emitter.html b/docs/0.14.2-incubating/development/extensions-contrib/kafka-emitter.html
index 0ad83bb..bb46616 100644
--- a/docs/0.14.2-incubating/development/extensions-contrib/kafka-emitter.html
+++ b/docs/0.14.2-incubating/development/extensions-contrib/kafka-emitter.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -228,7 +228,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.2-incubating/development/extensions-contrib/kafka-simple.html b/docs/0.14.2-incubating/development/extensions-contrib/kafka-simple.html
index 03a6af1..13291ae 100644
--- a/docs/0.14.2-incubating/development/extensions-contrib/kafka-simple.html
+++ b/docs/0.14.2-incubating/development/extensions-contrib/kafka-simple.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -231,7 +231,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.2-incubating/development/extensions-contrib/materialized-view.html b/docs/0.14.2-incubating/development/extensions-contrib/materialized-view.html
index 3cf2e32..b01827b 100644
--- a/docs/0.14.2-incubating/development/extensions-contrib/materialized-view.html
+++ b/docs/0.14.2-incubating/development/extensions-contrib/materialized-view.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -345,7 +345,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.2-incubating/development/extensions-contrib/opentsdb-emitter.html b/docs/0.14.2-incubating/development/extensions-contrib/opentsdb-emitter.html
index d4cb329..842cec0 100644
--- a/docs/0.14.2-incubating/development/extensions-contrib/opentsdb-emitter.html
+++ b/docs/0.14.2-incubating/development/extensions-contrib/opentsdb-emitter.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -250,7 +250,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.2-incubating/development/extensions-contrib/orc.html b/docs/0.14.2-incubating/development/extensions-contrib/orc.html
index f8f42f5..e8304a0 100644
--- a/docs/0.14.2-incubating/development/extensions-contrib/orc.html
+++ b/docs/0.14.2-incubating/development/extensions-contrib/orc.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -281,7 +281,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.2-incubating/development/extensions-contrib/rabbitmq.html b/docs/0.14.2-incubating/development/extensions-contrib/rabbitmq.html
index 71db08d..8460f18 100644
--- a/docs/0.14.2-incubating/development/extensions-contrib/rabbitmq.html
+++ b/docs/0.14.2-incubating/development/extensions-contrib/rabbitmq.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -309,7 +309,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.2-incubating/development/extensions-contrib/redis-cache.html b/docs/0.14.2-incubating/development/extensions-contrib/redis-cache.html
index 63f9089..1357aa8 100644
--- a/docs/0.14.2-incubating/development/extensions-contrib/redis-cache.html
+++ b/docs/0.14.2-incubating/development/extensions-contrib/redis-cache.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -255,7 +255,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.2-incubating/development/extensions-contrib/rocketmq.html b/docs/0.14.2-incubating/development/extensions-contrib/rocketmq.html
index 6fb1436..fb8600b 100644
--- a/docs/0.14.2-incubating/development/extensions-contrib/rocketmq.html
+++ b/docs/0.14.2-incubating/development/extensions-contrib/rocketmq.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -173,7 +173,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.2-incubating/development/extensions-contrib/sqlserver.html b/docs/0.14.2-incubating/development/extensions-contrib/sqlserver.html
index 06d44b6..04daf9e 100644
--- a/docs/0.14.2-incubating/development/extensions-contrib/sqlserver.html
+++ b/docs/0.14.2-incubating/development/extensions-contrib/sqlserver.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -203,7 +203,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.2-incubating/development/extensions-contrib/statsd.html b/docs/0.14.2-incubating/development/extensions-contrib/statsd.html
index fa5ab23..efa0be7 100644
--- a/docs/0.14.2-incubating/development/extensions-contrib/statsd.html
+++ b/docs/0.14.2-incubating/development/extensions-contrib/statsd.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -266,7 +266,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.2-incubating/development/extensions-contrib/thrift.html b/docs/0.14.2-incubating/development/extensions-contrib/thrift.html
index bb2b761..35ef3d5 100644
--- a/docs/0.14.2-incubating/development/extensions-contrib/thrift.html
+++ b/docs/0.14.2-incubating/development/extensions-contrib/thrift.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -292,7 +292,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.2-incubating/development/extensions-contrib/time-min-max.html b/docs/0.14.2-incubating/development/extensions-contrib/time-min-max.html
index 2f76e06..88d2ad7 100644
--- a/docs/0.14.2-incubating/development/extensions-contrib/time-min-max.html
+++ b/docs/0.14.2-incubating/development/extensions-contrib/time-min-max.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -234,7 +234,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.2-incubating/development/extensions-core/approximate-histograms.html b/docs/0.14.2-incubating/development/extensions-core/approximate-histograms.html
index 1eb7a61..65a3a40 100644
--- a/docs/0.14.2-incubating/development/extensions-core/approximate-histograms.html
+++ b/docs/0.14.2-incubating/development/extensions-core/approximate-histograms.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -486,7 +486,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.2-incubating/development/extensions-core/avro.html b/docs/0.14.2-incubating/development/extensions-core/avro.html
index 0ba09a7..8246a12 100644
--- a/docs/0.14.2-incubating/development/extensions-core/avro.html
+++ b/docs/0.14.2-incubating/development/extensions-core/avro.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -474,7 +474,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.2-incubating/development/extensions-core/bloom-filter.html b/docs/0.14.2-incubating/development/extensions-core/bloom-filter.html
index 95d08e5..743b182 100644
--- a/docs/0.14.2-incubating/development/extensions-core/bloom-filter.html
+++ b/docs/0.14.2-incubating/development/extensions-core/bloom-filter.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -345,7 +345,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.2-incubating/development/extensions-core/datasketches-extension.html b/docs/0.14.2-incubating/development/extensions-core/datasketches-extension.html
index 763b55e..71b8a1d 100644
--- a/docs/0.14.2-incubating/development/extensions-core/datasketches-extension.html
+++ b/docs/0.14.2-incubating/development/extensions-core/datasketches-extension.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -183,7 +183,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.2-incubating/development/extensions-core/datasketches-hll.html b/docs/0.14.2-incubating/development/extensions-core/datasketches-hll.html
index fd9a59e..4b0ac23 100644
--- a/docs/0.14.2-incubating/development/extensions-core/datasketches-hll.html
+++ b/docs/0.14.2-incubating/development/extensions-core/datasketches-hll.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -253,7 +253,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.2-incubating/development/extensions-core/datasketches-quantiles.html b/docs/0.14.2-incubating/development/extensions-core/datasketches-quantiles.html
index 83c7960..a97cf2d 100644
--- a/docs/0.14.2-incubating/development/extensions-core/datasketches-quantiles.html
+++ b/docs/0.14.2-incubating/development/extensions-core/datasketches-quantiles.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -262,7 +262,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.2-incubating/development/extensions-core/datasketches-theta.html b/docs/0.14.2-incubating/development/extensions-core/datasketches-theta.html
index 73a53f7..91f3629 100644
--- a/docs/0.14.2-incubating/development/extensions-core/datasketches-theta.html
+++ b/docs/0.14.2-incubating/development/extensions-core/datasketches-theta.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -416,7 +416,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.2-incubating/development/extensions-core/datasketches-tuple.html b/docs/0.14.2-incubating/development/extensions-core/datasketches-tuple.html
index 05aa6cd..21482e4 100644
--- a/docs/0.14.2-incubating/development/extensions-core/datasketches-tuple.html
+++ b/docs/0.14.2-incubating/development/extensions-core/datasketches-tuple.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -318,7 +318,7 @@
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-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.2-incubating/development/extensions-core/druid-basic-security.html b/docs/0.14.2-incubating/development/extensions-core/druid-basic-security.html
index ce9f9a8..58691be 100644
--- a/docs/0.14.2-incubating/development/extensions-core/druid-basic-security.html
+++ b/docs/0.14.2-incubating/development/extensions-core/druid-basic-security.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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@@ -660,7 +660,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.2-incubating/development/extensions-core/druid-kerberos.html b/docs/0.14.2-incubating/development/extensions-core/druid-kerberos.html
index d1aab89..ca6c545 100644
--- a/docs/0.14.2-incubating/development/extensions-core/druid-kerberos.html
+++ b/docs/0.14.2-incubating/development/extensions-core/druid-kerberos.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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@@ -347,7 +347,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.2-incubating/development/extensions-core/druid-lookups.html b/docs/0.14.2-incubating/development/extensions-core/druid-lookups.html
index 9aadaf2..ca35cd5 100644
--- a/docs/0.14.2-incubating/development/extensions-core/druid-lookups.html
+++ b/docs/0.14.2-incubating/development/extensions-core/druid-lookups.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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@@ -407,7 +407,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.2-incubating/development/extensions-core/examples.html b/docs/0.14.2-incubating/development/extensions-core/examples.html
index f7719fc..6faf43d 100644
--- a/docs/0.14.2-incubating/development/extensions-core/examples.html
+++ b/docs/0.14.2-incubating/development/extensions-core/examples.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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@@ -208,7 +208,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.2-incubating/development/extensions-core/hdfs.html b/docs/0.14.2-incubating/development/extensions-core/hdfs.html
index 36994a2..cab47bb 100644
--- a/docs/0.14.2-incubating/development/extensions-core/hdfs.html
+++ b/docs/0.14.2-incubating/development/extensions-core/hdfs.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -244,7 +244,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.2-incubating/development/extensions-core/kafka-eight-firehose.html b/docs/0.14.2-incubating/development/extensions-core/kafka-eight-firehose.html
index 0b1f94a..10c6bbb 100644
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -213,7 +213,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.2-incubating/development/extensions-core/kafka-extraction-namespace.html b/docs/0.14.2-incubating/development/extensions-core/kafka-extraction-namespace.html
index 7c82d73..c1a79c5 100644
--- a/docs/0.14.2-incubating/development/extensions-core/kafka-extraction-namespace.html
+++ b/docs/0.14.2-incubating/development/extensions-core/kafka-extraction-namespace.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -235,7 +235,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.2-incubating/development/extensions-core/kafka-ingestion.html b/docs/0.14.2-incubating/development/extensions-core/kafka-ingestion.html
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--- a/docs/0.14.2-incubating/development/extensions-core/kafka-ingestion.html
+++ b/docs/0.14.2-incubating/development/extensions-core/kafka-ingestion.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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@@ -763,7 +763,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.2-incubating/development/extensions-core/kinesis-ingestion.html b/docs/0.14.2-incubating/development/extensions-core/kinesis-ingestion.html
index 2879946..71848fa 100644
--- a/docs/0.14.2-incubating/development/extensions-core/kinesis-ingestion.html
+++ b/docs/0.14.2-incubating/development/extensions-core/kinesis-ingestion.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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@@ -859,7 +859,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.2-incubating/development/extensions-core/lookups-cached-global.html b/docs/0.14.2-incubating/development/extensions-core/lookups-cached-global.html
index 8c10d8d..6dc4ace 100644
--- a/docs/0.14.2-incubating/development/extensions-core/lookups-cached-global.html
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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@@ -691,7 +691,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.2-incubating/development/extensions-core/mysql.html b/docs/0.14.2-incubating/development/extensions-core/mysql.html
index 127e659..9158628 100644
--- a/docs/0.14.2-incubating/development/extensions-core/mysql.html
+++ b/docs/0.14.2-incubating/development/extensions-core/mysql.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -310,7 +310,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.2-incubating/development/extensions-core/parquet.html b/docs/0.14.2-incubating/development/extensions-core/parquet.html
index bf6ab2e..a0f804c 100644
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+++ b/docs/0.14.2-incubating/development/extensions-core/parquet.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -378,7 +378,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.2-incubating/development/extensions-core/postgresql.html b/docs/0.14.2-incubating/development/extensions-core/postgresql.html
index 499c84c..a9f3d6c 100644
--- a/docs/0.14.2-incubating/development/extensions-core/postgresql.html
+++ b/docs/0.14.2-incubating/development/extensions-core/postgresql.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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@@ -284,7 +284,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.2-incubating/development/extensions-core/protobuf.html b/docs/0.14.2-incubating/development/extensions-core/protobuf.html
index 9cb1739..79db519 100644
--- a/docs/0.14.2-incubating/development/extensions-core/protobuf.html
+++ b/docs/0.14.2-incubating/development/extensions-core/protobuf.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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@@ -384,7 +384,7 @@
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     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.2-incubating/development/extensions-core/s3.html b/docs/0.14.2-incubating/development/extensions-core/s3.html
index 83dce66..01eb671 100644
--- a/docs/0.14.2-incubating/development/extensions-core/s3.html
+++ b/docs/0.14.2-incubating/development/extensions-core/s3.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -364,7 +364,7 @@
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     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.2-incubating/development/extensions-core/simple-client-sslcontext.html b/docs/0.14.2-incubating/development/extensions-core/simple-client-sslcontext.html
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+++ b/docs/0.14.2-incubating/development/extensions-core/simple-client-sslcontext.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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@@ -272,7 +272,7 @@
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     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.2-incubating/development/extensions-core/stats.html b/docs/0.14.2-incubating/development/extensions-core/stats.html
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+++ b/docs/0.14.2-incubating/development/extensions-core/stats.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -307,7 +307,7 @@
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     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.2-incubating/development/extensions-core/test-stats.html b/docs/0.14.2-incubating/development/extensions-core/test-stats.html
index 79b9a86..3abe33d 100644
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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@@ -259,7 +259,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.2-incubating/development/extensions.html b/docs/0.14.2-incubating/development/extensions.html
index 775c275..8138166 100644
--- a/docs/0.14.2-incubating/development/extensions.html
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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@@ -417,7 +417,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.2-incubating/development/geo.html b/docs/0.14.2-incubating/development/geo.html
index 4121d1a..fbf4ed6 100644
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
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-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
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diff --git a/docs/0.14.2-incubating/development/integrating-druid-with-other-technologies.html b/docs/0.14.2-incubating/development/integrating-druid-with-other-technologies.html
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
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diff --git a/docs/0.14.2-incubating/development/javascript.html b/docs/0.14.2-incubating/development/javascript.html
index 966f3be..f002dc9 100644
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
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diff --git a/docs/0.14.2-incubating/development/modules.html b/docs/0.14.2-incubating/development/modules.html
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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@@ -410,7 +410,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
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diff --git a/docs/0.14.2-incubating/development/overview.html b/docs/0.14.2-incubating/development/overview.html
index 3350e6c..38bf874 100644
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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@@ -220,7 +220,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
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diff --git a/docs/0.14.2-incubating/development/router.html b/docs/0.14.2-incubating/development/router.html
index 38ee083..b01642d 100644
--- a/docs/0.14.2-incubating/development/router.html
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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@@ -431,7 +431,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
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diff --git a/docs/0.14.2-incubating/development/versioning.html b/docs/0.14.2-incubating/development/versioning.html
index 8c3b414..596b7ab 100644
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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@@ -191,7 +191,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
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diff --git a/docs/0.14.2-incubating/ingestion/batch-ingestion.html b/docs/0.14.2-incubating/ingestion/batch-ingestion.html
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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@@ -183,7 +183,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.2-incubating/ingestion/command-line-hadoop-indexer.html b/docs/0.14.2-incubating/ingestion/command-line-hadoop-indexer.html
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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@@ -288,7 +288,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.2-incubating/ingestion/compaction.html b/docs/0.14.2-incubating/ingestion/compaction.html
index fe636ab..5685aeb 100644
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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@@ -322,7 +322,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
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diff --git a/docs/0.14.2-incubating/ingestion/data-formats.html b/docs/0.14.2-incubating/ingestion/data-formats.html
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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@@ -325,7 +325,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.2-incubating/ingestion/delete-data.html b/docs/0.14.2-incubating/ingestion/delete-data.html
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.2-incubating/ingestion/faq.html b/docs/0.14.2-incubating/ingestion/faq.html
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-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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@@ -247,7 +247,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.2-incubating/ingestion/firehose.html b/docs/0.14.2-incubating/ingestion/firehose.html
index cf642ac..3148c2a 100644
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.2-incubating/ingestion/flatten-json.html b/docs/0.14.2-incubating/ingestion/flatten-json.html
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -356,7 +356,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.2-incubating/ingestion/hadoop-vs-native-batch.html b/docs/0.14.2-incubating/ingestion/hadoop-vs-native-batch.html
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.2-incubating/ingestion/hadoop.html b/docs/0.14.2-incubating/ingestion/hadoop.html
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.2-incubating/ingestion/index.html b/docs/0.14.2-incubating/ingestion/index.html
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.2-incubating/ingestion/ingestion-spec.html b/docs/0.14.2-incubating/ingestion/ingestion-spec.html
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.2-incubating/ingestion/locking-and-priority.html b/docs/0.14.2-incubating/ingestion/locking-and-priority.html
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-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
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diff --git a/docs/0.14.2-incubating/ingestion/misc-tasks.html b/docs/0.14.2-incubating/ingestion/misc-tasks.html
index 5499bef..d0780cb 100644
--- a/docs/0.14.2-incubating/ingestion/misc-tasks.html
+++ b/docs/0.14.2-incubating/ingestion/misc-tasks.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -225,7 +225,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.2-incubating/ingestion/native_tasks.html b/docs/0.14.2-incubating/ingestion/native_tasks.html
index c1b0aeb..20fcace 100644
--- a/docs/0.14.2-incubating/ingestion/native_tasks.html
+++ b/docs/0.14.2-incubating/ingestion/native_tasks.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -1107,7 +1107,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.2-incubating/ingestion/reports.html b/docs/0.14.2-incubating/ingestion/reports.html
index a21379d..c21df01 100644
--- a/docs/0.14.2-incubating/ingestion/reports.html
+++ b/docs/0.14.2-incubating/ingestion/reports.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -278,7 +278,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.2-incubating/ingestion/schema-changes.html b/docs/0.14.2-incubating/ingestion/schema-changes.html
index b6f13af..fcae90f 100644
--- a/docs/0.14.2-incubating/ingestion/schema-changes.html
+++ b/docs/0.14.2-incubating/ingestion/schema-changes.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -214,7 +214,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.2-incubating/ingestion/schema-design.html b/docs/0.14.2-incubating/ingestion/schema-design.html
index dc714f7..c7de5ea 100644
--- a/docs/0.14.2-incubating/ingestion/schema-design.html
+++ b/docs/0.14.2-incubating/ingestion/schema-design.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -471,7 +471,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.2-incubating/ingestion/stream-ingestion.html b/docs/0.14.2-incubating/ingestion/stream-ingestion.html
index 69a13e0..39cf497 100644
--- a/docs/0.14.2-incubating/ingestion/stream-ingestion.html
+++ b/docs/0.14.2-incubating/ingestion/stream-ingestion.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -200,7 +200,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.2-incubating/ingestion/stream-pull.html b/docs/0.14.2-incubating/ingestion/stream-pull.html
index 157de84..c118fe1 100644
--- a/docs/0.14.2-incubating/ingestion/stream-pull.html
+++ b/docs/0.14.2-incubating/ingestion/stream-pull.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -732,7 +732,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.2-incubating/ingestion/stream-push.html b/docs/0.14.2-incubating/ingestion/stream-push.html
index 642de97..a4d4897 100644
--- a/docs/0.14.2-incubating/ingestion/stream-push.html
+++ b/docs/0.14.2-incubating/ingestion/stream-push.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -328,7 +328,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.2-incubating/ingestion/tasks.html b/docs/0.14.2-incubating/ingestion/tasks.html
index 007d758..e01ffb9 100644
--- a/docs/0.14.2-incubating/ingestion/tasks.html
+++ b/docs/0.14.2-incubating/ingestion/tasks.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -222,7 +222,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.2-incubating/ingestion/transform-spec.html b/docs/0.14.2-incubating/ingestion/transform-spec.html
index ddea9a1..cf54da6 100644
--- a/docs/0.14.2-incubating/ingestion/transform-spec.html
+++ b/docs/0.14.2-incubating/ingestion/transform-spec.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -264,7 +264,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.2-incubating/ingestion/update-existing-data.html b/docs/0.14.2-incubating/ingestion/update-existing-data.html
index dd92283..449798a 100644
--- a/docs/0.14.2-incubating/ingestion/update-existing-data.html
+++ b/docs/0.14.2-incubating/ingestion/update-existing-data.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -380,7 +380,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.2-incubating/misc/math-expr.html b/docs/0.14.2-incubating/misc/math-expr.html
index b8fc284..779c371 100644
--- a/docs/0.14.2-incubating/misc/math-expr.html
+++ b/docs/0.14.2-incubating/misc/math-expr.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -521,7 +521,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.2-incubating/misc/papers-and-talks.html b/docs/0.14.2-incubating/misc/papers-and-talks.html
index eb68437..b267961 100644
--- a/docs/0.14.2-incubating/misc/papers-and-talks.html
+++ b/docs/0.14.2-incubating/misc/papers-and-talks.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -185,7 +185,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.2-incubating/operations/alerts.html b/docs/0.14.2-incubating/operations/alerts.html
index d777202..7fee469 100644
--- a/docs/0.14.2-incubating/operations/alerts.html
+++ b/docs/0.14.2-incubating/operations/alerts.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -184,7 +184,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.2-incubating/operations/api-reference.html b/docs/0.14.2-incubating/operations/api-reference.html
index 580656f..814bc0e 100644
--- a/docs/0.14.2-incubating/operations/api-reference.html
+++ b/docs/0.14.2-incubating/operations/api-reference.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -1146,7 +1146,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.2-incubating/operations/druid-console.html b/docs/0.14.2-incubating/operations/druid-console.html
index 089cbe8..a6e318f 100644
--- a/docs/0.14.2-incubating/operations/druid-console.html
+++ b/docs/0.14.2-incubating/operations/druid-console.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -232,7 +232,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.2-incubating/operations/dump-segment.html b/docs/0.14.2-incubating/operations/dump-segment.html
index 532d440..2bb5758 100644
--- a/docs/0.14.2-incubating/operations/dump-segment.html
+++ b/docs/0.14.2-incubating/operations/dump-segment.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -285,7 +285,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.2-incubating/operations/http-compression.html b/docs/0.14.2-incubating/operations/http-compression.html
index 1985845..14649c1 100644
--- a/docs/0.14.2-incubating/operations/http-compression.html
+++ b/docs/0.14.2-incubating/operations/http-compression.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -192,7 +192,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.2-incubating/operations/including-extensions.html b/docs/0.14.2-incubating/operations/including-extensions.html
index d215bd2..b84d296 100644
--- a/docs/0.14.2-incubating/operations/including-extensions.html
+++ b/docs/0.14.2-incubating/operations/including-extensions.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -224,7 +224,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.2-incubating/operations/insert-segment-to-db.html b/docs/0.14.2-incubating/operations/insert-segment-to-db.html
index a9e4ed1..d4e5ba7 100644
--- a/docs/0.14.2-incubating/operations/insert-segment-to-db.html
+++ b/docs/0.14.2-incubating/operations/insert-segment-to-db.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -285,7 +285,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.2-incubating/operations/management-uis.html b/docs/0.14.2-incubating/operations/management-uis.html
index 79d2571..ebd0d80 100644
--- a/docs/0.14.2-incubating/operations/management-uis.html
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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@@ -214,7 +214,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
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diff --git a/docs/0.14.2-incubating/operations/metrics.html b/docs/0.14.2-incubating/operations/metrics.html
index 707ebab..0f8ef8e 100644
--- a/docs/0.14.2-incubating/operations/metrics.html
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.2-incubating/operations/other-hadoop.html b/docs/0.14.2-incubating/operations/other-hadoop.html
index c9ea137..8c93a9b 100644
--- a/docs/0.14.2-incubating/operations/other-hadoop.html
+++ b/docs/0.14.2-incubating/operations/other-hadoop.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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@@ -431,7 +431,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.2-incubating/operations/password-provider.html b/docs/0.14.2-incubating/operations/password-provider.html
index 9a89d60..ef120fa 100644
--- a/docs/0.14.2-incubating/operations/password-provider.html
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -210,7 +210,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.2-incubating/operations/performance-faq.html b/docs/0.14.2-incubating/operations/performance-faq.html
index c1d0708..2bc68bb 100644
--- a/docs/0.14.2-incubating/operations/performance-faq.html
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -240,7 +240,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.2-incubating/operations/pull-deps.html b/docs/0.14.2-incubating/operations/pull-deps.html
index 3267270..a266ed1 100644
--- a/docs/0.14.2-incubating/operations/pull-deps.html
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -283,7 +283,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.2-incubating/operations/recommendations.html b/docs/0.14.2-incubating/operations/recommendations.html
index 94c2cbd..caf16b5 100644
--- a/docs/0.14.2-incubating/operations/recommendations.html
+++ b/docs/0.14.2-incubating/operations/recommendations.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -235,7 +235,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.2-incubating/operations/reset-cluster.html b/docs/0.14.2-incubating/operations/reset-cluster.html
index e9c93c5..681f836 100644
--- a/docs/0.14.2-incubating/operations/reset-cluster.html
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -209,7 +209,7 @@
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     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.2-incubating/operations/rolling-updates.html b/docs/0.14.2-incubating/operations/rolling-updates.html
index 7cb7c57..6f6259b 100644
--- a/docs/0.14.2-incubating/operations/rolling-updates.html
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -248,7 +248,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.2-incubating/operations/rule-configuration.html b/docs/0.14.2-incubating/operations/rule-configuration.html
index 04ac2d1..0058834 100644
--- a/docs/0.14.2-incubating/operations/rule-configuration.html
+++ b/docs/0.14.2-incubating/operations/rule-configuration.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -371,7 +371,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.2-incubating/operations/segment-optimization.html b/docs/0.14.2-incubating/operations/segment-optimization.html
index d7ff870..3535982 100644
--- a/docs/0.14.2-incubating/operations/segment-optimization.html
+++ b/docs/0.14.2-incubating/operations/segment-optimization.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -247,7 +247,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.2-incubating/operations/tls-support.html b/docs/0.14.2-incubating/operations/tls-support.html
index e0fbe6a..e0a106e 100644
--- a/docs/0.14.2-incubating/operations/tls-support.html
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -382,7 +382,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.2-incubating/operations/use_sbt_to_build_fat_jar.html b/docs/0.14.2-incubating/operations/use_sbt_to_build_fat_jar.html
index 8ea385b..21526cf 100644
--- a/docs/0.14.2-incubating/operations/use_sbt_to_build_fat_jar.html
+++ b/docs/0.14.2-incubating/operations/use_sbt_to_build_fat_jar.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -269,7 +269,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.2-incubating/querying/aggregations.html b/docs/0.14.2-incubating/querying/aggregations.html
index 327625f..2ad75d2 100644
--- a/docs/0.14.2-incubating/querying/aggregations.html
+++ b/docs/0.14.2-incubating/querying/aggregations.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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@@ -443,7 +443,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.2-incubating/querying/caching.html b/docs/0.14.2-incubating/querying/caching.html
index 86e50fd..e324bfd 100644
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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@@ -190,7 +190,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.2-incubating/querying/datasource.html b/docs/0.14.2-incubating/querying/datasource.html
index 7f1db88..1a3d83c 100644
--- a/docs/0.14.2-incubating/querying/datasource.html
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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@@ -201,7 +201,7 @@
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     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.2-incubating/querying/datasourcemetadataquery.html b/docs/0.14.2-incubating/querying/datasourcemetadataquery.html
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.2-incubating/querying/dimensionspecs.html b/docs/0.14.2-incubating/querying/dimensionspecs.html
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -627,7 +627,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.2-incubating/querying/filters.html b/docs/0.14.2-incubating/querying/filters.html
index e02bf9c..875262d 100644
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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@@ -778,7 +778,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.2-incubating/querying/granularities.html b/docs/0.14.2-incubating/querying/granularities.html
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -527,7 +527,7 @@
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     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.2-incubating/querying/groupbyquery.html b/docs/0.14.2-incubating/querying/groupbyquery.html
index 350fd32..81ef7ec 100644
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -774,7 +774,7 @@
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     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.2-incubating/querying/having.html b/docs/0.14.2-incubating/querying/having.html
index 02ad3c7..77b854e 100644
--- a/docs/0.14.2-incubating/querying/having.html
+++ b/docs/0.14.2-incubating/querying/having.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -371,7 +371,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.2-incubating/querying/hll-old.html b/docs/0.14.2-incubating/querying/hll-old.html
index fd2427c..ec96e35 100644
--- a/docs/0.14.2-incubating/querying/hll-old.html
+++ b/docs/0.14.2-incubating/querying/hll-old.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -265,7 +265,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.2-incubating/querying/joins.html b/docs/0.14.2-incubating/querying/joins.html
index 91bd9b2..14b2b6b 100644
--- a/docs/0.14.2-incubating/querying/joins.html
+++ b/docs/0.14.2-incubating/querying/joins.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -201,7 +201,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.2-incubating/querying/limitspec.html b/docs/0.14.2-incubating/querying/limitspec.html
index 05fe5c5..5889ec2 100644
--- a/docs/0.14.2-incubating/querying/limitspec.html
+++ b/docs/0.14.2-incubating/querying/limitspec.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -193,7 +193,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.2-incubating/querying/lookups.html b/docs/0.14.2-incubating/querying/lookups.html
index f577d5e..34fca84 100644
--- a/docs/0.14.2-incubating/querying/lookups.html
+++ b/docs/0.14.2-incubating/querying/lookups.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -644,7 +644,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.2-incubating/querying/multi-value-dimensions.html b/docs/0.14.2-incubating/querying/multi-value-dimensions.html
index 8bbe8c2..d68e7e2 100644
--- a/docs/0.14.2-incubating/querying/multi-value-dimensions.html
+++ b/docs/0.14.2-incubating/querying/multi-value-dimensions.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -456,7 +456,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.2-incubating/querying/multitenancy.html b/docs/0.14.2-incubating/querying/multitenancy.html
index c7cad16..c589e26 100644
--- a/docs/0.14.2-incubating/querying/multitenancy.html
+++ b/docs/0.14.2-incubating/querying/multitenancy.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -249,7 +249,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.2-incubating/querying/post-aggregations.html b/docs/0.14.2-incubating/querying/post-aggregations.html
index eaee022..a2234f7 100644
--- a/docs/0.14.2-incubating/querying/post-aggregations.html
+++ b/docs/0.14.2-incubating/querying/post-aggregations.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -336,7 +336,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.2-incubating/querying/query-context.html b/docs/0.14.2-incubating/querying/query-context.html
index 005620a..93c5cc7 100644
--- a/docs/0.14.2-incubating/querying/query-context.html
+++ b/docs/0.14.2-incubating/querying/query-context.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -288,7 +288,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.2-incubating/querying/querying.html b/docs/0.14.2-incubating/querying/querying.html
index 2b14946..bfc2286 100644
--- a/docs/0.14.2-incubating/querying/querying.html
+++ b/docs/0.14.2-incubating/querying/querying.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -300,7 +300,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.2-incubating/querying/scan-query.html b/docs/0.14.2-incubating/querying/scan-query.html
index bd5ecce..016c1dc 100644
--- a/docs/0.14.2-incubating/querying/scan-query.html
+++ b/docs/0.14.2-incubating/querying/scan-query.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -379,7 +379,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.2-incubating/querying/searchquery.html b/docs/0.14.2-incubating/querying/searchquery.html
index 27f8513..3059c8d 100644
--- a/docs/0.14.2-incubating/querying/searchquery.html
+++ b/docs/0.14.2-incubating/querying/searchquery.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -343,7 +343,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.2-incubating/querying/searchqueryspec.html b/docs/0.14.2-incubating/querying/searchqueryspec.html
index 4d12de5..90bfb19 100644
--- a/docs/0.14.2-incubating/querying/searchqueryspec.html
+++ b/docs/0.14.2-incubating/querying/searchqueryspec.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -205,7 +205,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.2-incubating/querying/segmentmetadataquery.html b/docs/0.14.2-incubating/querying/segmentmetadataquery.html
index 60f8c03..b2911b6 100644
--- a/docs/0.14.2-incubating/querying/segmentmetadataquery.html
+++ b/docs/0.14.2-incubating/querying/segmentmetadataquery.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -371,7 +371,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.2-incubating/querying/select-query.html b/docs/0.14.2-incubating/querying/select-query.html
index 884eee6..9d5f9d5 100644
--- a/docs/0.14.2-incubating/querying/select-query.html
+++ b/docs/0.14.2-incubating/querying/select-query.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -437,7 +437,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.2-incubating/querying/sorting-orders.html b/docs/0.14.2-incubating/querying/sorting-orders.html
index 11c8640..914d2a1 100644
--- a/docs/0.14.2-incubating/querying/sorting-orders.html
+++ b/docs/0.14.2-incubating/querying/sorting-orders.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -203,7 +203,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.2-incubating/querying/sql.html b/docs/0.14.2-incubating/querying/sql.html
index de23e67..77cff73 100644
--- a/docs/0.14.2-incubating/querying/sql.html
+++ b/docs/0.14.2-incubating/querying/sql.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -1596,7 +1596,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.2-incubating/querying/timeboundaryquery.html b/docs/0.14.2-incubating/querying/timeboundaryquery.html
index b6a0d81..237083b 100644
--- a/docs/0.14.2-incubating/querying/timeboundaryquery.html
+++ b/docs/0.14.2-incubating/querying/timeboundaryquery.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -222,7 +222,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.2-incubating/querying/timeseriesquery.html b/docs/0.14.2-incubating/querying/timeseriesquery.html
index 679e85d..3366a6b 100644
--- a/docs/0.14.2-incubating/querying/timeseriesquery.html
+++ b/docs/0.14.2-incubating/querying/timeseriesquery.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -334,7 +334,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.2-incubating/querying/topnmetricspec.html b/docs/0.14.2-incubating/querying/topnmetricspec.html
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--- a/docs/0.14.2-incubating/querying/topnmetricspec.html
+++ b/docs/0.14.2-incubating/querying/topnmetricspec.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -269,7 +269,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.2-incubating/querying/topnquery.html b/docs/0.14.2-incubating/querying/topnquery.html
index 9105160..560df41 100644
--- a/docs/0.14.2-incubating/querying/topnquery.html
+++ b/docs/0.14.2-incubating/querying/topnquery.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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@@ -439,7 +439,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.2-incubating/querying/virtual-columns.html b/docs/0.14.2-incubating/querying/virtual-columns.html
index c052e69..a4e6dd8 100644
--- a/docs/0.14.2-incubating/querying/virtual-columns.html
+++ b/docs/0.14.2-incubating/querying/virtual-columns.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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@@ -235,7 +235,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.2-incubating/tutorials/cluster.html b/docs/0.14.2-incubating/tutorials/cluster.html
index fe40cb1..cb369c1 100644
--- a/docs/0.14.2-incubating/tutorials/cluster.html
+++ b/docs/0.14.2-incubating/tutorials/cluster.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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@@ -558,7 +558,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.2-incubating/tutorials/index.html b/docs/0.14.2-incubating/tutorials/index.html
index f4902a4..62c1b55 100644
--- a/docs/0.14.2-incubating/tutorials/index.html
+++ b/docs/0.14.2-incubating/tutorials/index.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -325,7 +325,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.2-incubating/tutorials/tutorial-batch-hadoop.html b/docs/0.14.2-incubating/tutorials/tutorial-batch-hadoop.html
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--- a/docs/0.14.2-incubating/tutorials/tutorial-batch-hadoop.html
+++ b/docs/0.14.2-incubating/tutorials/tutorial-batch-hadoop.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -357,7 +357,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.2-incubating/tutorials/tutorial-batch.html b/docs/0.14.2-incubating/tutorials/tutorial-batch.html
index 6024520..0c0b442 100644
--- a/docs/0.14.2-incubating/tutorials/tutorial-batch.html
+++ b/docs/0.14.2-incubating/tutorials/tutorial-batch.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -308,7 +308,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.2-incubating/tutorials/tutorial-compaction.html b/docs/0.14.2-incubating/tutorials/tutorial-compaction.html
index 4d32559..3d54193 100644
--- a/docs/0.14.2-incubating/tutorials/tutorial-compaction.html
+++ b/docs/0.14.2-incubating/tutorials/tutorial-compaction.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -298,7 +298,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.2-incubating/tutorials/tutorial-delete-data.html b/docs/0.14.2-incubating/tutorials/tutorial-delete-data.html
index b3cf5da..5a16d8b 100644
--- a/docs/0.14.2-incubating/tutorials/tutorial-delete-data.html
+++ b/docs/0.14.2-incubating/tutorials/tutorial-delete-data.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -306,7 +306,7 @@
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     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.2-incubating/tutorials/tutorial-ingestion-spec.html b/docs/0.14.2-incubating/tutorials/tutorial-ingestion-spec.html
index f559c7d..30d440f 100644
--- a/docs/0.14.2-incubating/tutorials/tutorial-ingestion-spec.html
+++ b/docs/0.14.2-incubating/tutorials/tutorial-ingestion-spec.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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@@ -745,7 +745,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.2-incubating/tutorials/tutorial-kafka.html b/docs/0.14.2-incubating/tutorials/tutorial-kafka.html
index 86fa6c1..5993abb 100644
--- a/docs/0.14.2-incubating/tutorials/tutorial-kafka.html
+++ b/docs/0.14.2-incubating/tutorials/tutorial-kafka.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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@@ -233,7 +233,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.2-incubating/tutorials/tutorial-query.html b/docs/0.14.2-incubating/tutorials/tutorial-query.html
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--- a/docs/0.14.2-incubating/tutorials/tutorial-query.html
+++ b/docs/0.14.2-incubating/tutorials/tutorial-query.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -410,7 +410,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.2-incubating/tutorials/tutorial-retention.html b/docs/0.14.2-incubating/tutorials/tutorial-retention.html
index 4db37bb..06dfefd 100644
--- a/docs/0.14.2-incubating/tutorials/tutorial-retention.html
+++ b/docs/0.14.2-incubating/tutorials/tutorial-retention.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -258,7 +258,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.2-incubating/tutorials/tutorial-rollup.html b/docs/0.14.2-incubating/tutorials/tutorial-rollup.html
index 1476503..f7c482c 100644
--- a/docs/0.14.2-incubating/tutorials/tutorial-rollup.html
+++ b/docs/0.14.2-incubating/tutorials/tutorial-rollup.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -314,7 +314,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.2-incubating/tutorials/tutorial-tranquility.html b/docs/0.14.2-incubating/tutorials/tutorial-tranquility.html
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--- a/docs/0.14.2-incubating/tutorials/tutorial-tranquility.html
+++ b/docs/0.14.2-incubating/tutorials/tutorial-tranquility.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -234,7 +234,7 @@
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     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.2-incubating/tutorials/tutorial-transform-spec.html b/docs/0.14.2-incubating/tutorials/tutorial-transform-spec.html
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--- a/docs/0.14.2-incubating/tutorials/tutorial-transform-spec.html
+++ b/docs/0.14.2-incubating/tutorials/tutorial-transform-spec.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -290,7 +290,7 @@
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     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.14.2-incubating/tutorials/tutorial-update-data.html b/docs/0.14.2-incubating/tutorials/tutorial-update-data.html
index 0fa7edd..590d91c 100644
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+++ b/docs/0.14.2-incubating/tutorials/tutorial-update-data.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -285,7 +285,7 @@
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     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.0-incubating/comparisons/druid-vs-elasticsearch.html b/docs/0.15.0-incubating/comparisons/druid-vs-elasticsearch.html
index c485105..61cf084 100644
--- a/docs/0.15.0-incubating/comparisons/druid-vs-elasticsearch.html
+++ b/docs/0.15.0-incubating/comparisons/druid-vs-elasticsearch.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -184,7 +184,7 @@
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     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.0-incubating/comparisons/druid-vs-key-value.html b/docs/0.15.0-incubating/comparisons/druid-vs-key-value.html
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--- a/docs/0.15.0-incubating/comparisons/druid-vs-key-value.html
+++ b/docs/0.15.0-incubating/comparisons/druid-vs-key-value.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -193,7 +193,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.0-incubating/comparisons/druid-vs-kudu.html b/docs/0.15.0-incubating/comparisons/druid-vs-kudu.html
index 6783d2c..a58a400 100644
--- a/docs/0.15.0-incubating/comparisons/druid-vs-kudu.html
+++ b/docs/0.15.0-incubating/comparisons/druid-vs-kudu.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -184,7 +184,7 @@
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     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.0-incubating/comparisons/druid-vs-redshift.html b/docs/0.15.0-incubating/comparisons/druid-vs-redshift.html
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-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
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-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.0-incubating/comparisons/druid-vs-spark.html b/docs/0.15.0-incubating/comparisons/druid-vs-spark.html
index d535629..fa460c8 100644
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
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-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
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     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.0-incubating/comparisons/druid-vs-sql-on-hadoop.html b/docs/0.15.0-incubating/comparisons/druid-vs-sql-on-hadoop.html
index 00e49bf..5092664 100644
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
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diff --git a/docs/0.15.0-incubating/configuration/index.html b/docs/0.15.0-incubating/configuration/index.html
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-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
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@@ -4394,7 +4394,7 @@
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-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
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-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
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-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
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diff --git a/docs/0.15.0-incubating/configuration/realtime.html b/docs/0.15.0-incubating/configuration/realtime.html
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-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.0-incubating/dependencies/cassandra-deep-storage.html b/docs/0.15.0-incubating/dependencies/cassandra-deep-storage.html
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.0-incubating/dependencies/deep-storage.html b/docs/0.15.0-incubating/dependencies/deep-storage.html
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.0-incubating/dependencies/metadata-storage.html b/docs/0.15.0-incubating/dependencies/metadata-storage.html
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
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diff --git a/docs/0.15.0-incubating/dependencies/zookeeper.html b/docs/0.15.0-incubating/dependencies/zookeeper.html
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-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.0-incubating/design/auth.html b/docs/0.15.0-incubating/design/auth.html
index 2321739..483a51b 100644
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
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diff --git a/docs/0.15.0-incubating/design/broker.html b/docs/0.15.0-incubating/design/broker.html
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.0-incubating/design/coordinator.html b/docs/0.15.0-incubating/design/coordinator.html
index 2740539..b89caf6 100644
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
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diff --git a/docs/0.15.0-incubating/design/historical.html b/docs/0.15.0-incubating/design/historical.html
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.0-incubating/design/index.html b/docs/0.15.0-incubating/design/index.html
index 7f81008..626799d 100644
--- a/docs/0.15.0-incubating/design/index.html
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.0-incubating/design/indexing-service.html b/docs/0.15.0-incubating/design/indexing-service.html
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.0-incubating/design/middlemanager.html b/docs/0.15.0-incubating/design/middlemanager.html
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.0-incubating/design/overlord.html b/docs/0.15.0-incubating/design/overlord.html
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.0-incubating/design/peons.html b/docs/0.15.0-incubating/design/peons.html
index 52889dc..5beaa82 100644
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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@@ -188,7 +188,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.0-incubating/design/plumber.html b/docs/0.15.0-incubating/design/plumber.html
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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@@ -181,7 +181,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.0-incubating/design/processes.html b/docs/0.15.0-incubating/design/processes.html
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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@@ -279,7 +279,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.0-incubating/design/realtime.html b/docs/0.15.0-incubating/design/realtime.html
index 748949c..a429168 100644
--- a/docs/0.15.0-incubating/design/realtime.html
+++ b/docs/0.15.0-incubating/design/realtime.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -223,7 +223,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.0-incubating/design/segments.html b/docs/0.15.0-incubating/design/segments.html
index 4e8f5b2..7ca02a6 100644
--- a/docs/0.15.0-incubating/design/segments.html
+++ b/docs/0.15.0-incubating/design/segments.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -343,7 +343,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.0-incubating/development/build.html b/docs/0.15.0-incubating/development/build.html
index 305f16b..f2ad6bf 100644
--- a/docs/0.15.0-incubating/development/build.html
+++ b/docs/0.15.0-incubating/development/build.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -205,7 +205,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.0-incubating/development/experimental.html b/docs/0.15.0-incubating/development/experimental.html
index d40c124..c260f27 100644
--- a/docs/0.15.0-incubating/development/experimental.html
+++ b/docs/0.15.0-incubating/development/experimental.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -184,7 +184,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.0-incubating/development/extensions-contrib/ambari-metrics-emitter.html b/docs/0.15.0-incubating/development/extensions-contrib/ambari-metrics-emitter.html
index 690093d..2c9c9cc 100644
--- a/docs/0.15.0-incubating/development/extensions-contrib/ambari-metrics-emitter.html
+++ b/docs/0.15.0-incubating/development/extensions-contrib/ambari-metrics-emitter.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -308,7 +308,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.0-incubating/development/extensions-contrib/azure.html b/docs/0.15.0-incubating/development/extensions-contrib/azure.html
index 9675fdc..17f4d73 100644
--- a/docs/0.15.0-incubating/development/extensions-contrib/azure.html
+++ b/docs/0.15.0-incubating/development/extensions-contrib/azure.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -332,7 +332,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.0-incubating/development/extensions-contrib/cassandra.html b/docs/0.15.0-incubating/development/extensions-contrib/cassandra.html
index 05e04da..20ab4d1 100644
--- a/docs/0.15.0-incubating/development/extensions-contrib/cassandra.html
+++ b/docs/0.15.0-incubating/development/extensions-contrib/cassandra.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -175,7 +175,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.0-incubating/development/extensions-contrib/cloudfiles.html b/docs/0.15.0-incubating/development/extensions-contrib/cloudfiles.html
index e1c28a5..b085121 100644
--- a/docs/0.15.0-incubating/development/extensions-contrib/cloudfiles.html
+++ b/docs/0.15.0-incubating/development/extensions-contrib/cloudfiles.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -350,7 +350,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.0-incubating/development/extensions-contrib/distinctcount.html b/docs/0.15.0-incubating/development/extensions-contrib/distinctcount.html
index dcbfeeb..fa921fe 100644
--- a/docs/0.15.0-incubating/development/extensions-contrib/distinctcount.html
+++ b/docs/0.15.0-incubating/development/extensions-contrib/distinctcount.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -235,7 +235,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.0-incubating/development/extensions-contrib/google.html b/docs/0.15.0-incubating/development/extensions-contrib/google.html
index 3e6be0c..b8b7d3a 100644
--- a/docs/0.15.0-incubating/development/extensions-contrib/google.html
+++ b/docs/0.15.0-incubating/development/extensions-contrib/google.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -310,7 +310,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.0-incubating/development/extensions-contrib/graphite.html b/docs/0.15.0-incubating/development/extensions-contrib/graphite.html
index 5df00e3..b59c587 100644
--- a/docs/0.15.0-incubating/development/extensions-contrib/graphite.html
+++ b/docs/0.15.0-incubating/development/extensions-contrib/graphite.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -315,7 +315,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.0-incubating/development/extensions-contrib/influx.html b/docs/0.15.0-incubating/development/extensions-contrib/influx.html
index b5cfcf0..f1fa517 100644
--- a/docs/0.15.0-incubating/development/extensions-contrib/influx.html
+++ b/docs/0.15.0-incubating/development/extensions-contrib/influx.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -210,7 +210,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.0-incubating/development/extensions-contrib/kafka-emitter.html b/docs/0.15.0-incubating/development/extensions-contrib/kafka-emitter.html
index 28f9fa5..7b96dc3 100644
--- a/docs/0.15.0-incubating/development/extensions-contrib/kafka-emitter.html
+++ b/docs/0.15.0-incubating/development/extensions-contrib/kafka-emitter.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -228,7 +228,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.0-incubating/development/extensions-contrib/kafka-simple.html b/docs/0.15.0-incubating/development/extensions-contrib/kafka-simple.html
index f884046..b982d2f 100644
--- a/docs/0.15.0-incubating/development/extensions-contrib/kafka-simple.html
+++ b/docs/0.15.0-incubating/development/extensions-contrib/kafka-simple.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -231,7 +231,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.0-incubating/development/extensions-contrib/materialized-view.html b/docs/0.15.0-incubating/development/extensions-contrib/materialized-view.html
index e08e5a5..410e8e2 100644
--- a/docs/0.15.0-incubating/development/extensions-contrib/materialized-view.html
+++ b/docs/0.15.0-incubating/development/extensions-contrib/materialized-view.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -345,7 +345,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.0-incubating/development/extensions-contrib/momentsketch-quantiles.html b/docs/0.15.0-incubating/development/extensions-contrib/momentsketch-quantiles.html
index b57c895..f9abd0d 100644
--- a/docs/0.15.0-incubating/development/extensions-contrib/momentsketch-quantiles.html
+++ b/docs/0.15.0-incubating/development/extensions-contrib/momentsketch-quantiles.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -288,7 +288,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.0-incubating/development/extensions-contrib/moving-average-query.html b/docs/0.15.0-incubating/development/extensions-contrib/moving-average-query.html
index c31329b..33011fe 100644
--- a/docs/0.15.0-incubating/development/extensions-contrib/moving-average-query.html
+++ b/docs/0.15.0-incubating/development/extensions-contrib/moving-average-query.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -582,7 +582,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.0-incubating/development/extensions-contrib/opentsdb-emitter.html b/docs/0.15.0-incubating/development/extensions-contrib/opentsdb-emitter.html
index ab98432..0bf0b7a 100644
--- a/docs/0.15.0-incubating/development/extensions-contrib/opentsdb-emitter.html
+++ b/docs/0.15.0-incubating/development/extensions-contrib/opentsdb-emitter.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -250,7 +250,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.0-incubating/development/extensions-contrib/rabbitmq.html b/docs/0.15.0-incubating/development/extensions-contrib/rabbitmq.html
index 8d93977..c61b4b6 100644
--- a/docs/0.15.0-incubating/development/extensions-contrib/rabbitmq.html
+++ b/docs/0.15.0-incubating/development/extensions-contrib/rabbitmq.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -309,7 +309,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.0-incubating/development/extensions-contrib/redis-cache.html b/docs/0.15.0-incubating/development/extensions-contrib/redis-cache.html
index e588d6a..8906ac5 100644
--- a/docs/0.15.0-incubating/development/extensions-contrib/redis-cache.html
+++ b/docs/0.15.0-incubating/development/extensions-contrib/redis-cache.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -255,7 +255,7 @@
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     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.0-incubating/development/extensions-contrib/rocketmq.html b/docs/0.15.0-incubating/development/extensions-contrib/rocketmq.html
index b554108..fc94ce1 100644
--- a/docs/0.15.0-incubating/development/extensions-contrib/rocketmq.html
+++ b/docs/0.15.0-incubating/development/extensions-contrib/rocketmq.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -173,7 +173,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.0-incubating/development/extensions-contrib/sqlserver.html b/docs/0.15.0-incubating/development/extensions-contrib/sqlserver.html
index 76c44ba..d89097c 100644
--- a/docs/0.15.0-incubating/development/extensions-contrib/sqlserver.html
+++ b/docs/0.15.0-incubating/development/extensions-contrib/sqlserver.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -203,7 +203,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.0-incubating/development/extensions-contrib/statsd.html b/docs/0.15.0-incubating/development/extensions-contrib/statsd.html
index b1be613..6bede5c 100644
--- a/docs/0.15.0-incubating/development/extensions-contrib/statsd.html
+++ b/docs/0.15.0-incubating/development/extensions-contrib/statsd.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -266,7 +266,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.0-incubating/development/extensions-contrib/thrift.html b/docs/0.15.0-incubating/development/extensions-contrib/thrift.html
index 420da84..1683eb7 100644
--- a/docs/0.15.0-incubating/development/extensions-contrib/thrift.html
+++ b/docs/0.15.0-incubating/development/extensions-contrib/thrift.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -292,7 +292,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.0-incubating/development/extensions-contrib/time-min-max.html b/docs/0.15.0-incubating/development/extensions-contrib/time-min-max.html
index c0740ed..6dca2d3 100644
--- a/docs/0.15.0-incubating/development/extensions-contrib/time-min-max.html
+++ b/docs/0.15.0-incubating/development/extensions-contrib/time-min-max.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -234,7 +234,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.0-incubating/development/extensions-core/approximate-histograms.html b/docs/0.15.0-incubating/development/extensions-core/approximate-histograms.html
index d8d7bbe..94a957b 100644
--- a/docs/0.15.0-incubating/development/extensions-core/approximate-histograms.html
+++ b/docs/0.15.0-incubating/development/extensions-core/approximate-histograms.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -486,7 +486,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.0-incubating/development/extensions-core/avro.html b/docs/0.15.0-incubating/development/extensions-core/avro.html
index 7f7cb13..408d8e9 100644
--- a/docs/0.15.0-incubating/development/extensions-core/avro.html
+++ b/docs/0.15.0-incubating/development/extensions-core/avro.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -474,7 +474,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.0-incubating/development/extensions-core/bloom-filter.html b/docs/0.15.0-incubating/development/extensions-core/bloom-filter.html
index 86c8c50..b349e23 100644
--- a/docs/0.15.0-incubating/development/extensions-core/bloom-filter.html
+++ b/docs/0.15.0-incubating/development/extensions-core/bloom-filter.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -345,7 +345,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.0-incubating/development/extensions-core/datasketches-extension.html b/docs/0.15.0-incubating/development/extensions-core/datasketches-extension.html
index 3a15522..932dd84 100644
--- a/docs/0.15.0-incubating/development/extensions-core/datasketches-extension.html
+++ b/docs/0.15.0-incubating/development/extensions-core/datasketches-extension.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -183,7 +183,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.0-incubating/development/extensions-core/datasketches-hll.html b/docs/0.15.0-incubating/development/extensions-core/datasketches-hll.html
index ce1e6f0..a20345b 100644
--- a/docs/0.15.0-incubating/development/extensions-core/datasketches-hll.html
+++ b/docs/0.15.0-incubating/development/extensions-core/datasketches-hll.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -253,7 +253,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.0-incubating/development/extensions-core/datasketches-quantiles.html b/docs/0.15.0-incubating/development/extensions-core/datasketches-quantiles.html
index 73f1c1c..1d08e76 100644
--- a/docs/0.15.0-incubating/development/extensions-core/datasketches-quantiles.html
+++ b/docs/0.15.0-incubating/development/extensions-core/datasketches-quantiles.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -262,7 +262,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.0-incubating/development/extensions-core/datasketches-theta.html b/docs/0.15.0-incubating/development/extensions-core/datasketches-theta.html
index 6625997..3af11b7 100644
--- a/docs/0.15.0-incubating/development/extensions-core/datasketches-theta.html
+++ b/docs/0.15.0-incubating/development/extensions-core/datasketches-theta.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -416,7 +416,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.0-incubating/development/extensions-core/datasketches-tuple.html b/docs/0.15.0-incubating/development/extensions-core/datasketches-tuple.html
index 7c18c84..bf2f746 100644
--- a/docs/0.15.0-incubating/development/extensions-core/datasketches-tuple.html
+++ b/docs/0.15.0-incubating/development/extensions-core/datasketches-tuple.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -318,7 +318,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.0-incubating/development/extensions-core/druid-basic-security.html b/docs/0.15.0-incubating/development/extensions-core/druid-basic-security.html
index f8fc03d..c936854 100644
--- a/docs/0.15.0-incubating/development/extensions-core/druid-basic-security.html
+++ b/docs/0.15.0-incubating/development/extensions-core/druid-basic-security.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -674,7 +674,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.0-incubating/development/extensions-core/druid-kerberos.html b/docs/0.15.0-incubating/development/extensions-core/druid-kerberos.html
index 41184a0..cee9bb5 100644
--- a/docs/0.15.0-incubating/development/extensions-core/druid-kerberos.html
+++ b/docs/0.15.0-incubating/development/extensions-core/druid-kerberos.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -347,7 +347,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.0-incubating/development/extensions-core/druid-lookups.html b/docs/0.15.0-incubating/development/extensions-core/druid-lookups.html
index ac289e3..05d97d9 100644
--- a/docs/0.15.0-incubating/development/extensions-core/druid-lookups.html
+++ b/docs/0.15.0-incubating/development/extensions-core/druid-lookups.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -407,7 +407,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.0-incubating/development/extensions-core/examples.html b/docs/0.15.0-incubating/development/extensions-core/examples.html
index 5ca337f..a55a4ff 100644
--- a/docs/0.15.0-incubating/development/extensions-core/examples.html
+++ b/docs/0.15.0-incubating/development/extensions-core/examples.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -208,7 +208,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.0-incubating/development/extensions-core/hdfs.html b/docs/0.15.0-incubating/development/extensions-core/hdfs.html
index b5bb080..748002e 100644
--- a/docs/0.15.0-incubating/development/extensions-core/hdfs.html
+++ b/docs/0.15.0-incubating/development/extensions-core/hdfs.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -244,7 +244,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.0-incubating/development/extensions-core/kafka-eight-firehose.html b/docs/0.15.0-incubating/development/extensions-core/kafka-eight-firehose.html
index b4e71e8..047b1fa 100644
--- a/docs/0.15.0-incubating/development/extensions-core/kafka-eight-firehose.html
+++ b/docs/0.15.0-incubating/development/extensions-core/kafka-eight-firehose.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -213,7 +213,7 @@
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     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.0-incubating/development/extensions-core/kafka-extraction-namespace.html b/docs/0.15.0-incubating/development/extensions-core/kafka-extraction-namespace.html
index 6cb6fd9..20fb669 100644
--- a/docs/0.15.0-incubating/development/extensions-core/kafka-extraction-namespace.html
+++ b/docs/0.15.0-incubating/development/extensions-core/kafka-extraction-namespace.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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@@ -235,7 +235,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.0-incubating/development/extensions-core/kafka-ingestion.html b/docs/0.15.0-incubating/development/extensions-core/kafka-ingestion.html
index e95fbde..2c0e01c 100644
--- a/docs/0.15.0-incubating/development/extensions-core/kafka-ingestion.html
+++ b/docs/0.15.0-incubating/development/extensions-core/kafka-ingestion.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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@@ -757,7 +757,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.0-incubating/development/extensions-core/kinesis-ingestion.html b/docs/0.15.0-incubating/development/extensions-core/kinesis-ingestion.html
index 54ed293..21c224e 100644
--- a/docs/0.15.0-incubating/development/extensions-core/kinesis-ingestion.html
+++ b/docs/0.15.0-incubating/development/extensions-core/kinesis-ingestion.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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@@ -859,7 +859,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.0-incubating/development/extensions-core/lookups-cached-global.html b/docs/0.15.0-incubating/development/extensions-core/lookups-cached-global.html
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--- a/docs/0.15.0-incubating/development/extensions-core/lookups-cached-global.html
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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@@ -691,7 +691,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.0-incubating/development/extensions-core/mysql.html b/docs/0.15.0-incubating/development/extensions-core/mysql.html
index 3469cfb..e0228ad 100644
--- a/docs/0.15.0-incubating/development/extensions-core/mysql.html
+++ b/docs/0.15.0-incubating/development/extensions-core/mysql.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -310,7 +310,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.0-incubating/development/extensions-core/orc.html b/docs/0.15.0-incubating/development/extensions-core/orc.html
index 1b7b0c0..80fb846 100644
--- a/docs/0.15.0-incubating/development/extensions-core/orc.html
+++ b/docs/0.15.0-incubating/development/extensions-core/orc.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -458,7 +458,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.0-incubating/development/extensions-core/parquet.html b/docs/0.15.0-incubating/development/extensions-core/parquet.html
index ac2e367..b82f4a1 100644
--- a/docs/0.15.0-incubating/development/extensions-core/parquet.html
+++ b/docs/0.15.0-incubating/development/extensions-core/parquet.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -385,7 +385,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.0-incubating/development/extensions-core/postgresql.html b/docs/0.15.0-incubating/development/extensions-core/postgresql.html
index e997b68..77b7a00 100644
--- a/docs/0.15.0-incubating/development/extensions-core/postgresql.html
+++ b/docs/0.15.0-incubating/development/extensions-core/postgresql.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -284,7 +284,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.0-incubating/development/extensions-core/protobuf.html b/docs/0.15.0-incubating/development/extensions-core/protobuf.html
index cf3c3bd..d10d854 100644
--- a/docs/0.15.0-incubating/development/extensions-core/protobuf.html
+++ b/docs/0.15.0-incubating/development/extensions-core/protobuf.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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@@ -384,7 +384,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.0-incubating/development/extensions-core/s3.html b/docs/0.15.0-incubating/development/extensions-core/s3.html
index a45c6f2..5dcc042 100644
--- a/docs/0.15.0-incubating/development/extensions-core/s3.html
+++ b/docs/0.15.0-incubating/development/extensions-core/s3.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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@@ -374,7 +374,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.0-incubating/development/extensions-core/simple-client-sslcontext.html b/docs/0.15.0-incubating/development/extensions-core/simple-client-sslcontext.html
index a761fbc..53f00dd 100644
--- a/docs/0.15.0-incubating/development/extensions-core/simple-client-sslcontext.html
+++ b/docs/0.15.0-incubating/development/extensions-core/simple-client-sslcontext.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -272,7 +272,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.0-incubating/development/extensions-core/stats.html b/docs/0.15.0-incubating/development/extensions-core/stats.html
index bf222c9..b13f70a 100644
--- a/docs/0.15.0-incubating/development/extensions-core/stats.html
+++ b/docs/0.15.0-incubating/development/extensions-core/stats.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -307,7 +307,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.0-incubating/development/extensions-core/test-stats.html b/docs/0.15.0-incubating/development/extensions-core/test-stats.html
index 4bd861b..8758dd3 100644
--- a/docs/0.15.0-incubating/development/extensions-core/test-stats.html
+++ b/docs/0.15.0-incubating/development/extensions-core/test-stats.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -259,7 +259,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.0-incubating/development/extensions.html b/docs/0.15.0-incubating/development/extensions.html
index 2eecad3..720b06d 100644
--- a/docs/0.15.0-incubating/development/extensions.html
+++ b/docs/0.15.0-incubating/development/extensions.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -427,7 +427,7 @@
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     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.0-incubating/development/geo.html b/docs/0.15.0-incubating/development/geo.html
index 7a17f63..737bd46 100644
--- a/docs/0.15.0-incubating/development/geo.html
+++ b/docs/0.15.0-incubating/development/geo.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -274,7 +274,7 @@
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     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.0-incubating/development/integrating-druid-with-other-technologies.html b/docs/0.15.0-incubating/development/integrating-druid-with-other-technologies.html
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+++ b/docs/0.15.0-incubating/development/integrating-druid-with-other-technologies.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -183,7 +183,7 @@
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     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.0-incubating/development/javascript.html b/docs/0.15.0-incubating/development/javascript.html
index e6054ea..bf447e3 100644
--- a/docs/0.15.0-incubating/development/javascript.html
+++ b/docs/0.15.0-incubating/development/javascript.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -221,7 +221,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.0-incubating/development/modules.html b/docs/0.15.0-incubating/development/modules.html
index 10f1da6..2a8bbe4 100644
--- a/docs/0.15.0-incubating/development/modules.html
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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@@ -410,7 +410,7 @@
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     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.0-incubating/development/overview.html b/docs/0.15.0-incubating/development/overview.html
index f3495a2..2eb9c15 100644
--- a/docs/0.15.0-incubating/development/overview.html
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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@@ -220,7 +220,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.0-incubating/development/router.html b/docs/0.15.0-incubating/development/router.html
index 1986145..3260bc4 100644
--- a/docs/0.15.0-incubating/development/router.html
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
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index 9a14481..a1e5e8a 100644
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-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
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@@ -121,7 +121,7 @@
       
 
       
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-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
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-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
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diff --git a/docs/0.15.0-incubating/ingestion/compaction.html b/docs/0.15.0-incubating/ingestion/compaction.html
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-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
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-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
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-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
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-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
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-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
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-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
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-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
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diff --git a/docs/0.15.0-incubating/ingestion/flatten-json.html b/docs/0.15.0-incubating/ingestion/flatten-json.html
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
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-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.0-incubating/ingestion/hadoop-vs-native-batch.html b/docs/0.15.0-incubating/ingestion/hadoop-vs-native-batch.html
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
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-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
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diff --git a/docs/0.15.0-incubating/ingestion/hadoop.html b/docs/0.15.0-incubating/ingestion/hadoop.html
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-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
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-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
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diff --git a/docs/0.15.0-incubating/ingestion/index.html b/docs/0.15.0-incubating/ingestion/index.html
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-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
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-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
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diff --git a/docs/0.15.0-incubating/ingestion/locking-and-priority.html b/docs/0.15.0-incubating/ingestion/locking-and-priority.html
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
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diff --git a/docs/0.15.0-incubating/ingestion/misc-tasks.html b/docs/0.15.0-incubating/ingestion/misc-tasks.html
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
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     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.0-incubating/ingestion/native_tasks.html b/docs/0.15.0-incubating/ingestion/native_tasks.html
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
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diff --git a/docs/0.15.0-incubating/ingestion/reports.html b/docs/0.15.0-incubating/ingestion/reports.html
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-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
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-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
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diff --git a/docs/0.15.0-incubating/ingestion/schema-changes.html b/docs/0.15.0-incubating/ingestion/schema-changes.html
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
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diff --git a/docs/0.15.0-incubating/ingestion/schema-design.html b/docs/0.15.0-incubating/ingestion/schema-design.html
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
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diff --git a/docs/0.15.0-incubating/ingestion/stream-ingestion.html b/docs/0.15.0-incubating/ingestion/stream-ingestion.html
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
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diff --git a/docs/0.15.0-incubating/ingestion/stream-pull.html b/docs/0.15.0-incubating/ingestion/stream-pull.html
index f9fc7a5..930b274 100644
--- a/docs/0.15.0-incubating/ingestion/stream-pull.html
+++ b/docs/0.15.0-incubating/ingestion/stream-pull.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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@@ -732,7 +732,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.0-incubating/ingestion/stream-push.html b/docs/0.15.0-incubating/ingestion/stream-push.html
index 694f929..2876527 100644
--- a/docs/0.15.0-incubating/ingestion/stream-push.html
+++ b/docs/0.15.0-incubating/ingestion/stream-push.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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@@ -328,7 +328,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.0-incubating/ingestion/tasks.html b/docs/0.15.0-incubating/ingestion/tasks.html
index c7d1fa5..722ff11 100644
--- a/docs/0.15.0-incubating/ingestion/tasks.html
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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@@ -222,7 +222,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.0-incubating/ingestion/transform-spec.html b/docs/0.15.0-incubating/ingestion/transform-spec.html
index 1569556..c18b975 100644
--- a/docs/0.15.0-incubating/ingestion/transform-spec.html
+++ b/docs/0.15.0-incubating/ingestion/transform-spec.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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@@ -264,7 +264,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.0-incubating/ingestion/update-existing-data.html b/docs/0.15.0-incubating/ingestion/update-existing-data.html
index 43ab62c..113063d 100644
--- a/docs/0.15.0-incubating/ingestion/update-existing-data.html
+++ b/docs/0.15.0-incubating/ingestion/update-existing-data.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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@@ -380,7 +380,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.0-incubating/misc/math-expr.html b/docs/0.15.0-incubating/misc/math-expr.html
index d7b2a44..9ab96b6 100644
--- a/docs/0.15.0-incubating/misc/math-expr.html
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -561,7 +561,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.0-incubating/misc/papers-and-talks.html b/docs/0.15.0-incubating/misc/papers-and-talks.html
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+++ b/docs/0.15.0-incubating/misc/papers-and-talks.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -185,7 +185,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.0-incubating/operations/alerts.html b/docs/0.15.0-incubating/operations/alerts.html
index 36f5709..1ae0d3f 100644
--- a/docs/0.15.0-incubating/operations/alerts.html
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -184,7 +184,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.0-incubating/operations/api-reference.html b/docs/0.15.0-incubating/operations/api-reference.html
index f95517e..cadaaf7 100644
--- a/docs/0.15.0-incubating/operations/api-reference.html
+++ b/docs/0.15.0-incubating/operations/api-reference.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -1173,7 +1173,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.0-incubating/operations/basic-cluster-tuning.html b/docs/0.15.0-incubating/operations/basic-cluster-tuning.html
index 35d7443..96165e2 100644
--- a/docs/0.15.0-incubating/operations/basic-cluster-tuning.html
+++ b/docs/0.15.0-incubating/operations/basic-cluster-tuning.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -537,7 +537,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.0-incubating/operations/deep-storage-migration.html b/docs/0.15.0-incubating/operations/deep-storage-migration.html
index e49547f..3adaded 100644
--- a/docs/0.15.0-incubating/operations/deep-storage-migration.html
+++ b/docs/0.15.0-incubating/operations/deep-storage-migration.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -210,7 +210,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.0-incubating/operations/druid-console.html b/docs/0.15.0-incubating/operations/druid-console.html
index 3df75ba..bbdc8f5 100644
--- a/docs/0.15.0-incubating/operations/druid-console.html
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -258,7 +258,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.0-incubating/operations/dump-segment.html b/docs/0.15.0-incubating/operations/dump-segment.html
index 7fde11d..d8137c0 100644
--- a/docs/0.15.0-incubating/operations/dump-segment.html
+++ b/docs/0.15.0-incubating/operations/dump-segment.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -285,7 +285,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.0-incubating/operations/export-metadata.html b/docs/0.15.0-incubating/operations/export-metadata.html
index f454c52..6f3d20a 100644
--- a/docs/0.15.0-incubating/operations/export-metadata.html
+++ b/docs/0.15.0-incubating/operations/export-metadata.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -324,7 +324,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.0-incubating/operations/getting-started.html b/docs/0.15.0-incubating/operations/getting-started.html
index 2ecadc8..5002347 100644
--- a/docs/0.15.0-incubating/operations/getting-started.html
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -193,7 +193,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.0-incubating/operations/high-availability.html b/docs/0.15.0-incubating/operations/high-availability.html
index 3bcf3c8..62a5950 100644
--- a/docs/0.15.0-incubating/operations/high-availability.html
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -186,7 +186,7 @@
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     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.0-incubating/operations/http-compression.html b/docs/0.15.0-incubating/operations/http-compression.html
index 4424a99..6c7453c 100644
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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@@ -192,7 +192,7 @@
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     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.0-incubating/operations/including-extensions.html b/docs/0.15.0-incubating/operations/including-extensions.html
index db0b958..d2b605f 100644
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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@@ -224,7 +224,7 @@
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     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.0-incubating/operations/insert-segment-to-db.html b/docs/0.15.0-incubating/operations/insert-segment-to-db.html
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+++ b/docs/0.15.0-incubating/operations/insert-segment-to-db.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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@@ -195,7 +195,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.0-incubating/operations/management-uis.html b/docs/0.15.0-incubating/operations/management-uis.html
index fb924dc..730641c 100644
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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@@ -214,7 +214,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.0-incubating/operations/metadata-migration.html b/docs/0.15.0-incubating/operations/metadata-migration.html
index c310068..3723c2b 100644
--- a/docs/0.15.0-incubating/operations/metadata-migration.html
+++ b/docs/0.15.0-incubating/operations/metadata-migration.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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@@ -229,7 +229,7 @@
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-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
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diff --git a/docs/0.15.0-incubating/operations/metrics.html b/docs/0.15.0-incubating/operations/metrics.html
index d5dcff3..a3a7a15 100644
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.0-incubating/operations/other-hadoop.html b/docs/0.15.0-incubating/operations/other-hadoop.html
index 6b7d405..18204f6 100644
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.0-incubating/operations/password-provider.html b/docs/0.15.0-incubating/operations/password-provider.html
index f9026cb..4ea8410 100644
--- a/docs/0.15.0-incubating/operations/password-provider.html
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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@@ -210,7 +210,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.0-incubating/operations/pull-deps.html b/docs/0.15.0-incubating/operations/pull-deps.html
index 4e70c85..70e244b 100644
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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@@ -283,7 +283,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.0-incubating/operations/recommendations.html b/docs/0.15.0-incubating/operations/recommendations.html
index 7c6a030..b50b5fb 100644
--- a/docs/0.15.0-incubating/operations/recommendations.html
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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@@ -233,7 +233,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.0-incubating/operations/reset-cluster.html b/docs/0.15.0-incubating/operations/reset-cluster.html
index 3bfc510..f357544 100644
--- a/docs/0.15.0-incubating/operations/reset-cluster.html
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -209,7 +209,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
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diff --git a/docs/0.15.0-incubating/operations/rolling-updates.html b/docs/0.15.0-incubating/operations/rolling-updates.html
index 42f72fa..c09e14c 100644
--- a/docs/0.15.0-incubating/operations/rolling-updates.html
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -248,7 +248,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.0-incubating/operations/rule-configuration.html b/docs/0.15.0-incubating/operations/rule-configuration.html
index 09a47f1..a8da069 100644
--- a/docs/0.15.0-incubating/operations/rule-configuration.html
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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@@ -369,7 +369,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.0-incubating/operations/segment-optimization.html b/docs/0.15.0-incubating/operations/segment-optimization.html
index de770a3..fcbb29c 100644
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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@@ -247,7 +247,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.0-incubating/operations/single-server.html b/docs/0.15.0-incubating/operations/single-server.html
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--- a/docs/0.15.0-incubating/operations/single-server.html
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.0-incubating/operations/tls-support.html b/docs/0.15.0-incubating/operations/tls-support.html
index 7be4027..47cf577 100644
--- a/docs/0.15.0-incubating/operations/tls-support.html
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.0-incubating/operations/use_sbt_to_build_fat_jar.html b/docs/0.15.0-incubating/operations/use_sbt_to_build_fat_jar.html
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--- a/docs/0.15.0-incubating/operations/use_sbt_to_build_fat_jar.html
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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@@ -269,7 +269,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.0-incubating/querying/aggregations.html b/docs/0.15.0-incubating/querying/aggregations.html
index 83b68f2..edcd0cd 100644
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.0-incubating/querying/caching.html b/docs/0.15.0-incubating/querying/caching.html
index 87d5335..37bd091 100644
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.0-incubating/querying/datasource.html b/docs/0.15.0-incubating/querying/datasource.html
index 9e2931e..90e9446 100644
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.0-incubating/querying/datasourcemetadataquery.html b/docs/0.15.0-incubating/querying/datasourcemetadataquery.html
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.0-incubating/querying/dimensionspecs.html b/docs/0.15.0-incubating/querying/dimensionspecs.html
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.0-incubating/querying/filters.html b/docs/0.15.0-incubating/querying/filters.html
index 6413a26..5838f3d 100644
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-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.0-incubating/querying/granularities.html b/docs/0.15.0-incubating/querying/granularities.html
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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@@ -527,7 +527,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.0-incubating/querying/groupbyquery.html b/docs/0.15.0-incubating/querying/groupbyquery.html
index c78da56..8add883 100644
--- a/docs/0.15.0-incubating/querying/groupbyquery.html
+++ b/docs/0.15.0-incubating/querying/groupbyquery.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -775,7 +775,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.0-incubating/querying/having.html b/docs/0.15.0-incubating/querying/having.html
index 820d9f5..b55b930 100644
--- a/docs/0.15.0-incubating/querying/having.html
+++ b/docs/0.15.0-incubating/querying/having.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -371,7 +371,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.0-incubating/querying/hll-old.html b/docs/0.15.0-incubating/querying/hll-old.html
index f70d6b1..ba90710 100644
--- a/docs/0.15.0-incubating/querying/hll-old.html
+++ b/docs/0.15.0-incubating/querying/hll-old.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -265,7 +265,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.0-incubating/querying/joins.html b/docs/0.15.0-incubating/querying/joins.html
index 5a61474..337bb22 100644
--- a/docs/0.15.0-incubating/querying/joins.html
+++ b/docs/0.15.0-incubating/querying/joins.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -201,7 +201,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.0-incubating/querying/limitspec.html b/docs/0.15.0-incubating/querying/limitspec.html
index da26da9..7a05d2b 100644
--- a/docs/0.15.0-incubating/querying/limitspec.html
+++ b/docs/0.15.0-incubating/querying/limitspec.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -193,7 +193,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.0-incubating/querying/lookups.html b/docs/0.15.0-incubating/querying/lookups.html
index 6b62ff2..50996b8 100644
--- a/docs/0.15.0-incubating/querying/lookups.html
+++ b/docs/0.15.0-incubating/querying/lookups.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -651,7 +651,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.0-incubating/querying/multi-value-dimensions.html b/docs/0.15.0-incubating/querying/multi-value-dimensions.html
index 0a26531..6ba0a98 100644
--- a/docs/0.15.0-incubating/querying/multi-value-dimensions.html
+++ b/docs/0.15.0-incubating/querying/multi-value-dimensions.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -456,7 +456,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.0-incubating/querying/multitenancy.html b/docs/0.15.0-incubating/querying/multitenancy.html
index 379887b..6a06751 100644
--- a/docs/0.15.0-incubating/querying/multitenancy.html
+++ b/docs/0.15.0-incubating/querying/multitenancy.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -249,7 +249,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.0-incubating/querying/post-aggregations.html b/docs/0.15.0-incubating/querying/post-aggregations.html
index 897d384..7d2734c 100644
--- a/docs/0.15.0-incubating/querying/post-aggregations.html
+++ b/docs/0.15.0-incubating/querying/post-aggregations.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -336,7 +336,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.0-incubating/querying/query-context.html b/docs/0.15.0-incubating/querying/query-context.html
index 98fd892..9141255 100644
--- a/docs/0.15.0-incubating/querying/query-context.html
+++ b/docs/0.15.0-incubating/querying/query-context.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -288,7 +288,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.0-incubating/querying/querying.html b/docs/0.15.0-incubating/querying/querying.html
index 869fd4b..580833a 100644
--- a/docs/0.15.0-incubating/querying/querying.html
+++ b/docs/0.15.0-incubating/querying/querying.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -311,7 +311,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.0-incubating/querying/scan-query.html b/docs/0.15.0-incubating/querying/scan-query.html
index 9545692..0d0fcf1 100644
--- a/docs/0.15.0-incubating/querying/scan-query.html
+++ b/docs/0.15.0-incubating/querying/scan-query.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -449,7 +449,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.0-incubating/querying/searchquery.html b/docs/0.15.0-incubating/querying/searchquery.html
index 60f04c0..b385b42 100644
--- a/docs/0.15.0-incubating/querying/searchquery.html
+++ b/docs/0.15.0-incubating/querying/searchquery.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -343,7 +343,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.0-incubating/querying/searchqueryspec.html b/docs/0.15.0-incubating/querying/searchqueryspec.html
index 54844b6..9a0ba92 100644
--- a/docs/0.15.0-incubating/querying/searchqueryspec.html
+++ b/docs/0.15.0-incubating/querying/searchqueryspec.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -205,7 +205,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.0-incubating/querying/segmentmetadataquery.html b/docs/0.15.0-incubating/querying/segmentmetadataquery.html
index ae4d7ff..5ee156a 100644
--- a/docs/0.15.0-incubating/querying/segmentmetadataquery.html
+++ b/docs/0.15.0-incubating/querying/segmentmetadataquery.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -371,7 +371,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.0-incubating/querying/select-query.html b/docs/0.15.0-incubating/querying/select-query.html
index d6370b9..2577352 100644
--- a/docs/0.15.0-incubating/querying/select-query.html
+++ b/docs/0.15.0-incubating/querying/select-query.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -438,7 +438,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.0-incubating/querying/sorting-orders.html b/docs/0.15.0-incubating/querying/sorting-orders.html
index 0c9d346..16d22a5 100644
--- a/docs/0.15.0-incubating/querying/sorting-orders.html
+++ b/docs/0.15.0-incubating/querying/sorting-orders.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -203,7 +203,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.0-incubating/querying/sql.html b/docs/0.15.0-incubating/querying/sql.html
index f0e28c6..7b37895 100644
--- a/docs/0.15.0-incubating/querying/sql.html
+++ b/docs/0.15.0-incubating/querying/sql.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -1713,7 +1713,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.0-incubating/querying/timeboundaryquery.html b/docs/0.15.0-incubating/querying/timeboundaryquery.html
index fbfc79a..623f628 100644
--- a/docs/0.15.0-incubating/querying/timeboundaryquery.html
+++ b/docs/0.15.0-incubating/querying/timeboundaryquery.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -222,7 +222,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.0-incubating/querying/timeseriesquery.html b/docs/0.15.0-incubating/querying/timeseriesquery.html
index d8747c7..6456d8d 100644
--- a/docs/0.15.0-incubating/querying/timeseriesquery.html
+++ b/docs/0.15.0-incubating/querying/timeseriesquery.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -334,7 +334,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.0-incubating/querying/topnmetricspec.html b/docs/0.15.0-incubating/querying/topnmetricspec.html
index 965439a..5e77caf 100644
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-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
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diff --git a/docs/0.15.0-incubating/querying/topnquery.html b/docs/0.15.0-incubating/querying/topnquery.html
index 9120aca..fab23bd 100644
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
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diff --git a/docs/0.15.0-incubating/querying/virtual-columns.html b/docs/0.15.0-incubating/querying/virtual-columns.html
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
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diff --git a/docs/0.15.0-incubating/tutorials/cluster.html b/docs/0.15.0-incubating/tutorials/cluster.html
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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@@ -637,7 +637,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
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diff --git a/docs/0.15.0-incubating/tutorials/index.html b/docs/0.15.0-incubating/tutorials/index.html
index d15413b..fac514a 100644
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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@@ -340,7 +340,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.0-incubating/tutorials/tutorial-batch-hadoop.html b/docs/0.15.0-incubating/tutorials/tutorial-batch-hadoop.html
index eb121df..5afcfbf 100644
--- a/docs/0.15.0-incubating/tutorials/tutorial-batch-hadoop.html
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -359,7 +359,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.0-incubating/tutorials/tutorial-batch.html b/docs/0.15.0-incubating/tutorials/tutorial-batch.html
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -389,7 +389,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.0-incubating/tutorials/tutorial-compaction.html b/docs/0.15.0-incubating/tutorials/tutorial-compaction.html
index 1247c27..09f7621 100644
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -297,7 +297,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.0-incubating/tutorials/tutorial-delete-data.html b/docs/0.15.0-incubating/tutorials/tutorial-delete-data.html
index 2abf55a..8efabc2 100644
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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@@ -302,7 +302,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.0-incubating/tutorials/tutorial-ingestion-spec.html b/docs/0.15.0-incubating/tutorials/tutorial-ingestion-spec.html
index 9b12036..64c560b 100644
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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@@ -745,7 +745,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.0-incubating/tutorials/tutorial-kafka.html b/docs/0.15.0-incubating/tutorials/tutorial-kafka.html
index c91952c..a046f18 100644
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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@@ -307,7 +307,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.0-incubating/tutorials/tutorial-kerberos-hadoop.html b/docs/0.15.0-incubating/tutorials/tutorial-kerberos-hadoop.html
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+++ b/docs/0.15.0-incubating/tutorials/tutorial-kerberos-hadoop.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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@@ -258,7 +258,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.0-incubating/tutorials/tutorial-query.html b/docs/0.15.0-incubating/tutorials/tutorial-query.html
index 308fc75..7525255 100644
--- a/docs/0.15.0-incubating/tutorials/tutorial-query.html
+++ b/docs/0.15.0-incubating/tutorials/tutorial-query.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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@@ -411,7 +411,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.0-incubating/tutorials/tutorial-retention.html b/docs/0.15.0-incubating/tutorials/tutorial-retention.html
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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@@ -258,7 +258,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.0-incubating/tutorials/tutorial-rollup.html b/docs/0.15.0-incubating/tutorials/tutorial-rollup.html
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+++ b/docs/0.15.0-incubating/tutorials/tutorial-rollup.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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@@ -313,7 +313,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.0-incubating/tutorials/tutorial-tranquility.html b/docs/0.15.0-incubating/tutorials/tutorial-tranquility.html
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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@@ -234,7 +234,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.0-incubating/tutorials/tutorial-transform-spec.html b/docs/0.15.0-incubating/tutorials/tutorial-transform-spec.html
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
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diff --git a/docs/0.15.0-incubating/tutorials/tutorial-update-data.html b/docs/0.15.0-incubating/tutorials/tutorial-update-data.html
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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@@ -285,7 +285,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.1-incubating/comparisons/druid-vs-elasticsearch.html b/docs/0.15.1-incubating/comparisons/druid-vs-elasticsearch.html
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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@@ -184,7 +184,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.1-incubating/comparisons/druid-vs-key-value.html b/docs/0.15.1-incubating/comparisons/druid-vs-key-value.html
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
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diff --git a/docs/0.15.1-incubating/comparisons/druid-vs-kudu.html b/docs/0.15.1-incubating/comparisons/druid-vs-kudu.html
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diff --git a/docs/0.15.1-incubating/comparisons/druid-vs-redshift.html b/docs/0.15.1-incubating/comparisons/druid-vs-redshift.html
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+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.1-incubating/comparisons/druid-vs-spark.html b/docs/0.15.1-incubating/comparisons/druid-vs-spark.html
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-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
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     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.1-incubating/comparisons/druid-vs-sql-on-hadoop.html b/docs/0.15.1-incubating/comparisons/druid-vs-sql-on-hadoop.html
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@@ -121,7 +121,7 @@
       
 
       
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-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
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diff --git a/docs/0.15.1-incubating/configuration/index.html b/docs/0.15.1-incubating/configuration/index.html
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     <a href="/community/">Community</a>&ensp;·&ensp;
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     <a href="/community/">Community</a>&ensp;·&ensp;
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-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
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-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.1-incubating/dependencies/cassandra-deep-storage.html b/docs/0.15.1-incubating/dependencies/cassandra-deep-storage.html
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
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-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
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diff --git a/docs/0.15.1-incubating/dependencies/deep-storage.html b/docs/0.15.1-incubating/dependencies/deep-storage.html
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-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
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-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
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-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
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-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
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-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
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diff --git a/docs/0.15.1-incubating/design/auth.html b/docs/0.15.1-incubating/design/auth.html
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-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
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-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
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-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
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-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
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-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
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-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
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-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
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-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
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diff --git a/docs/0.15.1-incubating/design/index.html b/docs/0.15.1-incubating/design/index.html
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
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-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
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     <a href="/faq">FAQ</a>
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
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-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
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     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.1-incubating/design/middlemanager.html b/docs/0.15.1-incubating/design/middlemanager.html
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-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
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     <a href="/downloads.html">Download</a>&ensp;·&ensp;
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diff --git a/docs/0.15.1-incubating/design/overlord.html b/docs/0.15.1-incubating/design/overlord.html
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-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
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-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
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     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.1-incubating/design/peons.html b/docs/0.15.1-incubating/design/peons.html
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-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
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+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.1-incubating/design/plumber.html b/docs/0.15.1-incubating/design/plumber.html
index a7524fc..0a291ab 100644
--- a/docs/0.15.1-incubating/design/plumber.html
+++ b/docs/0.15.1-incubating/design/plumber.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -181,7 +181,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.1-incubating/design/processes.html b/docs/0.15.1-incubating/design/processes.html
index 48db611..4346300 100644
--- a/docs/0.15.1-incubating/design/processes.html
+++ b/docs/0.15.1-incubating/design/processes.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -279,7 +279,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.1-incubating/design/realtime.html b/docs/0.15.1-incubating/design/realtime.html
index d6c6d46..faa75e5 100644
--- a/docs/0.15.1-incubating/design/realtime.html
+++ b/docs/0.15.1-incubating/design/realtime.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -223,7 +223,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.1-incubating/design/segments.html b/docs/0.15.1-incubating/design/segments.html
index 68e98b0..ec47b89 100644
--- a/docs/0.15.1-incubating/design/segments.html
+++ b/docs/0.15.1-incubating/design/segments.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -343,7 +343,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.1-incubating/development/build.html b/docs/0.15.1-incubating/development/build.html
index 711130b..4a67697 100644
--- a/docs/0.15.1-incubating/development/build.html
+++ b/docs/0.15.1-incubating/development/build.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -205,7 +205,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.1-incubating/development/experimental.html b/docs/0.15.1-incubating/development/experimental.html
index 40430e1..dafdbaa 100644
--- a/docs/0.15.1-incubating/development/experimental.html
+++ b/docs/0.15.1-incubating/development/experimental.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -184,7 +184,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.1-incubating/development/extensions-contrib/ambari-metrics-emitter.html b/docs/0.15.1-incubating/development/extensions-contrib/ambari-metrics-emitter.html
index 0d7f9b5..190c81a 100644
--- a/docs/0.15.1-incubating/development/extensions-contrib/ambari-metrics-emitter.html
+++ b/docs/0.15.1-incubating/development/extensions-contrib/ambari-metrics-emitter.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -308,7 +308,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.1-incubating/development/extensions-contrib/azure.html b/docs/0.15.1-incubating/development/extensions-contrib/azure.html
index a422a27..5b4ec54 100644
--- a/docs/0.15.1-incubating/development/extensions-contrib/azure.html
+++ b/docs/0.15.1-incubating/development/extensions-contrib/azure.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -332,7 +332,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.1-incubating/development/extensions-contrib/cassandra.html b/docs/0.15.1-incubating/development/extensions-contrib/cassandra.html
index adcdec4..d55af18 100644
--- a/docs/0.15.1-incubating/development/extensions-contrib/cassandra.html
+++ b/docs/0.15.1-incubating/development/extensions-contrib/cassandra.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -175,7 +175,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.1-incubating/development/extensions-contrib/cloudfiles.html b/docs/0.15.1-incubating/development/extensions-contrib/cloudfiles.html
index a8c5bea..e9bd97b 100644
--- a/docs/0.15.1-incubating/development/extensions-contrib/cloudfiles.html
+++ b/docs/0.15.1-incubating/development/extensions-contrib/cloudfiles.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -350,7 +350,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.1-incubating/development/extensions-contrib/distinctcount.html b/docs/0.15.1-incubating/development/extensions-contrib/distinctcount.html
index ce37fbe..43a5f02 100644
--- a/docs/0.15.1-incubating/development/extensions-contrib/distinctcount.html
+++ b/docs/0.15.1-incubating/development/extensions-contrib/distinctcount.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -237,7 +237,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.1-incubating/development/extensions-contrib/google.html b/docs/0.15.1-incubating/development/extensions-contrib/google.html
index 7245ba4..d03d784 100644
--- a/docs/0.15.1-incubating/development/extensions-contrib/google.html
+++ b/docs/0.15.1-incubating/development/extensions-contrib/google.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -310,7 +310,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.1-incubating/development/extensions-contrib/graphite.html b/docs/0.15.1-incubating/development/extensions-contrib/graphite.html
index dc0c5f1..844120f 100644
--- a/docs/0.15.1-incubating/development/extensions-contrib/graphite.html
+++ b/docs/0.15.1-incubating/development/extensions-contrib/graphite.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -315,7 +315,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.1-incubating/development/extensions-contrib/influx.html b/docs/0.15.1-incubating/development/extensions-contrib/influx.html
index 36bf471..87fdeb4 100644
--- a/docs/0.15.1-incubating/development/extensions-contrib/influx.html
+++ b/docs/0.15.1-incubating/development/extensions-contrib/influx.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -211,7 +211,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.1-incubating/development/extensions-contrib/kafka-emitter.html b/docs/0.15.1-incubating/development/extensions-contrib/kafka-emitter.html
index 8d68685..c3b9e81 100644
--- a/docs/0.15.1-incubating/development/extensions-contrib/kafka-emitter.html
+++ b/docs/0.15.1-incubating/development/extensions-contrib/kafka-emitter.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -228,7 +228,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.1-incubating/development/extensions-contrib/kafka-simple.html b/docs/0.15.1-incubating/development/extensions-contrib/kafka-simple.html
index c2dcab5..f320e94 100644
--- a/docs/0.15.1-incubating/development/extensions-contrib/kafka-simple.html
+++ b/docs/0.15.1-incubating/development/extensions-contrib/kafka-simple.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -231,7 +231,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.1-incubating/development/extensions-contrib/materialized-view.html b/docs/0.15.1-incubating/development/extensions-contrib/materialized-view.html
index de6509d..7d79714 100644
--- a/docs/0.15.1-incubating/development/extensions-contrib/materialized-view.html
+++ b/docs/0.15.1-incubating/development/extensions-contrib/materialized-view.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -342,7 +342,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.1-incubating/development/extensions-contrib/momentsketch-quantiles.html b/docs/0.15.1-incubating/development/extensions-contrib/momentsketch-quantiles.html
index 88a7bf3..cfc169a 100644
--- a/docs/0.15.1-incubating/development/extensions-contrib/momentsketch-quantiles.html
+++ b/docs/0.15.1-incubating/development/extensions-contrib/momentsketch-quantiles.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -279,7 +279,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.1-incubating/development/extensions-contrib/moving-average-query.html b/docs/0.15.1-incubating/development/extensions-contrib/moving-average-query.html
index c5f3f4e..91d21cb 100644
--- a/docs/0.15.1-incubating/development/extensions-contrib/moving-average-query.html
+++ b/docs/0.15.1-incubating/development/extensions-contrib/moving-average-query.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -579,7 +579,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.1-incubating/development/extensions-contrib/opentsdb-emitter.html b/docs/0.15.1-incubating/development/extensions-contrib/opentsdb-emitter.html
index 28a1a94..9866cc7 100644
--- a/docs/0.15.1-incubating/development/extensions-contrib/opentsdb-emitter.html
+++ b/docs/0.15.1-incubating/development/extensions-contrib/opentsdb-emitter.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -250,7 +250,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.1-incubating/development/extensions-contrib/rabbitmq.html b/docs/0.15.1-incubating/development/extensions-contrib/rabbitmq.html
index bf1f4ec..6cc1de6 100644
--- a/docs/0.15.1-incubating/development/extensions-contrib/rabbitmq.html
+++ b/docs/0.15.1-incubating/development/extensions-contrib/rabbitmq.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -309,7 +309,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.1-incubating/development/extensions-contrib/redis-cache.html b/docs/0.15.1-incubating/development/extensions-contrib/redis-cache.html
index a6b5d06..68db1f6 100644
--- a/docs/0.15.1-incubating/development/extensions-contrib/redis-cache.html
+++ b/docs/0.15.1-incubating/development/extensions-contrib/redis-cache.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -255,7 +255,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.1-incubating/development/extensions-contrib/rocketmq.html b/docs/0.15.1-incubating/development/extensions-contrib/rocketmq.html
index af93fb6..a144e6a 100644
--- a/docs/0.15.1-incubating/development/extensions-contrib/rocketmq.html
+++ b/docs/0.15.1-incubating/development/extensions-contrib/rocketmq.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -173,7 +173,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.1-incubating/development/extensions-contrib/sqlserver.html b/docs/0.15.1-incubating/development/extensions-contrib/sqlserver.html
index e0968a2..2577ce8 100644
--- a/docs/0.15.1-incubating/development/extensions-contrib/sqlserver.html
+++ b/docs/0.15.1-incubating/development/extensions-contrib/sqlserver.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -203,7 +203,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.1-incubating/development/extensions-contrib/statsd.html b/docs/0.15.1-incubating/development/extensions-contrib/statsd.html
index f4ea5d9..9dd9484 100644
--- a/docs/0.15.1-incubating/development/extensions-contrib/statsd.html
+++ b/docs/0.15.1-incubating/development/extensions-contrib/statsd.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -266,7 +266,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.1-incubating/development/extensions-contrib/thrift.html b/docs/0.15.1-incubating/development/extensions-contrib/thrift.html
index 588c72b..aee1025 100644
--- a/docs/0.15.1-incubating/development/extensions-contrib/thrift.html
+++ b/docs/0.15.1-incubating/development/extensions-contrib/thrift.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -292,7 +292,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.1-incubating/development/extensions-contrib/time-min-max.html b/docs/0.15.1-incubating/development/extensions-contrib/time-min-max.html
index 9604167..b6dc2b0 100644
--- a/docs/0.15.1-incubating/development/extensions-contrib/time-min-max.html
+++ b/docs/0.15.1-incubating/development/extensions-contrib/time-min-max.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -234,7 +234,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.1-incubating/development/extensions-core/approximate-histograms.html b/docs/0.15.1-incubating/development/extensions-core/approximate-histograms.html
index 9b0cfec..11c7ffa 100644
--- a/docs/0.15.1-incubating/development/extensions-core/approximate-histograms.html
+++ b/docs/0.15.1-incubating/development/extensions-core/approximate-histograms.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -486,7 +486,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.1-incubating/development/extensions-core/avro.html b/docs/0.15.1-incubating/development/extensions-core/avro.html
index 87a59b9..d3067c2 100644
--- a/docs/0.15.1-incubating/development/extensions-core/avro.html
+++ b/docs/0.15.1-incubating/development/extensions-core/avro.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -474,7 +474,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.1-incubating/development/extensions-core/bloom-filter.html b/docs/0.15.1-incubating/development/extensions-core/bloom-filter.html
index 87f1a61..630edf2 100644
--- a/docs/0.15.1-incubating/development/extensions-core/bloom-filter.html
+++ b/docs/0.15.1-incubating/development/extensions-core/bloom-filter.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -345,7 +345,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.1-incubating/development/extensions-core/datasketches-extension.html b/docs/0.15.1-incubating/development/extensions-core/datasketches-extension.html
index dcfb8d9..c867569 100644
--- a/docs/0.15.1-incubating/development/extensions-core/datasketches-extension.html
+++ b/docs/0.15.1-incubating/development/extensions-core/datasketches-extension.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -183,7 +183,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.1-incubating/development/extensions-core/datasketches-hll.html b/docs/0.15.1-incubating/development/extensions-core/datasketches-hll.html
index e603a8f..ec4bad2 100644
--- a/docs/0.15.1-incubating/development/extensions-core/datasketches-hll.html
+++ b/docs/0.15.1-incubating/development/extensions-core/datasketches-hll.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -253,7 +253,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.1-incubating/development/extensions-core/datasketches-quantiles.html b/docs/0.15.1-incubating/development/extensions-core/datasketches-quantiles.html
index 33bb626..f518eac 100644
--- a/docs/0.15.1-incubating/development/extensions-core/datasketches-quantiles.html
+++ b/docs/0.15.1-incubating/development/extensions-core/datasketches-quantiles.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -262,7 +262,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.1-incubating/development/extensions-core/datasketches-theta.html b/docs/0.15.1-incubating/development/extensions-core/datasketches-theta.html
index 20c70f2..b0ddee1 100644
--- a/docs/0.15.1-incubating/development/extensions-core/datasketches-theta.html
+++ b/docs/0.15.1-incubating/development/extensions-core/datasketches-theta.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -416,7 +416,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.1-incubating/development/extensions-core/datasketches-tuple.html b/docs/0.15.1-incubating/development/extensions-core/datasketches-tuple.html
index e16f67e..a2e6a95 100644
--- a/docs/0.15.1-incubating/development/extensions-core/datasketches-tuple.html
+++ b/docs/0.15.1-incubating/development/extensions-core/datasketches-tuple.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -318,7 +318,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.1-incubating/development/extensions-core/druid-basic-security.html b/docs/0.15.1-incubating/development/extensions-core/druid-basic-security.html
index de6c5f0..40fb7c5 100644
--- a/docs/0.15.1-incubating/development/extensions-core/druid-basic-security.html
+++ b/docs/0.15.1-incubating/development/extensions-core/druid-basic-security.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -798,7 +798,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.1-incubating/development/extensions-core/druid-kerberos.html b/docs/0.15.1-incubating/development/extensions-core/druid-kerberos.html
index 06ea682..aa1b0fb 100644
--- a/docs/0.15.1-incubating/development/extensions-core/druid-kerberos.html
+++ b/docs/0.15.1-incubating/development/extensions-core/druid-kerberos.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -347,7 +347,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.1-incubating/development/extensions-core/druid-lookups.html b/docs/0.15.1-incubating/development/extensions-core/druid-lookups.html
index bfc7465..1cc3725 100644
--- a/docs/0.15.1-incubating/development/extensions-core/druid-lookups.html
+++ b/docs/0.15.1-incubating/development/extensions-core/druid-lookups.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -406,7 +406,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.1-incubating/development/extensions-core/examples.html b/docs/0.15.1-incubating/development/extensions-core/examples.html
index 2fbd202..cb69f7f 100644
--- a/docs/0.15.1-incubating/development/extensions-core/examples.html
+++ b/docs/0.15.1-incubating/development/extensions-core/examples.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -208,7 +208,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.1-incubating/development/extensions-core/hdfs.html b/docs/0.15.1-incubating/development/extensions-core/hdfs.html
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-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
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@@ -244,7 +244,7 @@
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-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
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diff --git a/docs/0.15.1-incubating/development/extensions-core/kafka-eight-firehose.html b/docs/0.15.1-incubating/development/extensions-core/kafka-eight-firehose.html
index 57c29aa..6307f03 100644
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
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-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.1-incubating/development/extensions-core/kafka-extraction-namespace.html b/docs/0.15.1-incubating/development/extensions-core/kafka-extraction-namespace.html
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.1-incubating/development/extensions-core/kafka-ingestion.html b/docs/0.15.1-incubating/development/extensions-core/kafka-ingestion.html
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.1-incubating/development/extensions-core/kinesis-ingestion.html b/docs/0.15.1-incubating/development/extensions-core/kinesis-ingestion.html
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.1-incubating/development/extensions-core/lookups-cached-global.html b/docs/0.15.1-incubating/development/extensions-core/lookups-cached-global.html
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.1-incubating/development/extensions-core/mysql.html b/docs/0.15.1-incubating/development/extensions-core/mysql.html
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--- a/docs/0.15.1-incubating/development/extensions-core/mysql.html
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
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@@ -310,7 +310,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
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diff --git a/docs/0.15.1-incubating/development/extensions-core/orc.html b/docs/0.15.1-incubating/development/extensions-core/orc.html
index 811b0e3..39e5eee 100644
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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@@ -460,7 +460,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.1-incubating/development/extensions-core/parquet.html b/docs/0.15.1-incubating/development/extensions-core/parquet.html
index 5c32194..36eada8 100644
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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@@ -385,7 +385,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.1-incubating/development/extensions-core/postgresql.html b/docs/0.15.1-incubating/development/extensions-core/postgresql.html
index 2a8068e..8720529 100644
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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@@ -284,7 +284,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.1-incubating/development/extensions-core/protobuf.html b/docs/0.15.1-incubating/development/extensions-core/protobuf.html
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
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@@ -384,7 +384,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.1-incubating/development/extensions-core/s3.html b/docs/0.15.1-incubating/development/extensions-core/s3.html
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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@@ -374,7 +374,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.1-incubating/development/extensions-core/simple-client-sslcontext.html b/docs/0.15.1-incubating/development/extensions-core/simple-client-sslcontext.html
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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@@ -272,7 +272,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.1-incubating/development/extensions-core/stats.html b/docs/0.15.1-incubating/development/extensions-core/stats.html
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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@@ -307,7 +307,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.1-incubating/development/extensions-core/test-stats.html b/docs/0.15.1-incubating/development/extensions-core/test-stats.html
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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@@ -259,7 +259,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.1-incubating/development/extensions.html b/docs/0.15.1-incubating/development/extensions.html
index 7fa7afd..5083cba 100644
--- a/docs/0.15.1-incubating/development/extensions.html
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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@@ -432,7 +432,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.1-incubating/development/geo.html b/docs/0.15.1-incubating/development/geo.html
index 2886f4b..16fc925 100644
--- a/docs/0.15.1-incubating/development/geo.html
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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@@ -274,7 +274,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.1-incubating/development/integrating-druid-with-other-technologies.html b/docs/0.15.1-incubating/development/integrating-druid-with-other-technologies.html
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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@@ -183,7 +183,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.1-incubating/development/javascript.html b/docs/0.15.1-incubating/development/javascript.html
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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@@ -221,7 +221,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.1-incubating/development/modules.html b/docs/0.15.1-incubating/development/modules.html
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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@@ -410,7 +410,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
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diff --git a/docs/0.15.1-incubating/development/overview.html b/docs/0.15.1-incubating/development/overview.html
index b0fbd65..a863032 100644
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
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-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
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-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
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diff --git a/docs/0.15.1-incubating/development/versioning.html b/docs/0.15.1-incubating/development/versioning.html
index 726678e..be69769 100644
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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@@ -191,7 +191,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
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diff --git a/docs/0.15.1-incubating/ingestion/batch-ingestion.html b/docs/0.15.1-incubating/ingestion/batch-ingestion.html
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.1-incubating/ingestion/command-line-hadoop-indexer.html b/docs/0.15.1-incubating/ingestion/command-line-hadoop-indexer.html
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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@@ -288,7 +288,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
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diff --git a/docs/0.15.1-incubating/ingestion/compaction.html b/docs/0.15.1-incubating/ingestion/compaction.html
index 5cf95db..d70b926 100644
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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@@ -322,7 +322,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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@@ -325,7 +325,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
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diff --git a/docs/0.15.1-incubating/ingestion/delete-data.html b/docs/0.15.1-incubating/ingestion/delete-data.html
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
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diff --git a/docs/0.15.1-incubating/ingestion/faq.html b/docs/0.15.1-incubating/ingestion/faq.html
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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@@ -247,7 +247,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
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diff --git a/docs/0.15.1-incubating/ingestion/firehose.html b/docs/0.15.1-incubating/ingestion/firehose.html
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
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diff --git a/docs/0.15.1-incubating/ingestion/flatten-json.html b/docs/0.15.1-incubating/ingestion/flatten-json.html
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.1-incubating/ingestion/hadoop-vs-native-batch.html b/docs/0.15.1-incubating/ingestion/hadoop-vs-native-batch.html
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.1-incubating/ingestion/hadoop.html b/docs/0.15.1-incubating/ingestion/hadoop.html
index 3b0de23..7dfcd40 100644
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.1-incubating/ingestion/index.html b/docs/0.15.1-incubating/ingestion/index.html
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--- a/docs/0.15.1-incubating/ingestion/index.html
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.1-incubating/ingestion/ingestion-spec.html b/docs/0.15.1-incubating/ingestion/ingestion-spec.html
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.1-incubating/ingestion/locking-and-priority.html b/docs/0.15.1-incubating/ingestion/locking-and-priority.html
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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@@ -253,7 +253,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.1-incubating/ingestion/misc-tasks.html b/docs/0.15.1-incubating/ingestion/misc-tasks.html
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.1-incubating/ingestion/native_tasks.html b/docs/0.15.1-incubating/ingestion/native_tasks.html
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
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diff --git a/docs/0.15.1-incubating/ingestion/reports.html b/docs/0.15.1-incubating/ingestion/reports.html
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-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
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     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.1-incubating/ingestion/schema-changes.html b/docs/0.15.1-incubating/ingestion/schema-changes.html
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-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
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diff --git a/docs/0.15.1-incubating/ingestion/schema-design.html b/docs/0.15.1-incubating/ingestion/schema-design.html
index 2c3c1b1..2f0e56c 100644
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+++ b/docs/0.15.1-incubating/ingestion/schema-design.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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@@ -471,7 +471,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.1-incubating/ingestion/stream-ingestion.html b/docs/0.15.1-incubating/ingestion/stream-ingestion.html
index 8765bfd..d030223 100644
--- a/docs/0.15.1-incubating/ingestion/stream-ingestion.html
+++ b/docs/0.15.1-incubating/ingestion/stream-ingestion.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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@@ -200,7 +200,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.1-incubating/ingestion/stream-pull.html b/docs/0.15.1-incubating/ingestion/stream-pull.html
index 7b5044d..f5e2fc9 100644
--- a/docs/0.15.1-incubating/ingestion/stream-pull.html
+++ b/docs/0.15.1-incubating/ingestion/stream-pull.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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@@ -732,7 +732,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.1-incubating/ingestion/stream-push.html b/docs/0.15.1-incubating/ingestion/stream-push.html
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--- a/docs/0.15.1-incubating/ingestion/stream-push.html
+++ b/docs/0.15.1-incubating/ingestion/stream-push.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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@@ -328,7 +328,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.1-incubating/ingestion/tasks.html b/docs/0.15.1-incubating/ingestion/tasks.html
index 320ad91..ea6c69e 100644
--- a/docs/0.15.1-incubating/ingestion/tasks.html
+++ b/docs/0.15.1-incubating/ingestion/tasks.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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@@ -222,7 +222,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.1-incubating/ingestion/transform-spec.html b/docs/0.15.1-incubating/ingestion/transform-spec.html
index d8c61a7..695df4d 100644
--- a/docs/0.15.1-incubating/ingestion/transform-spec.html
+++ b/docs/0.15.1-incubating/ingestion/transform-spec.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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@@ -264,7 +264,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.1-incubating/ingestion/update-existing-data.html b/docs/0.15.1-incubating/ingestion/update-existing-data.html
index 4ebfe75..fff6fa3 100644
--- a/docs/0.15.1-incubating/ingestion/update-existing-data.html
+++ b/docs/0.15.1-incubating/ingestion/update-existing-data.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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@@ -380,7 +380,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
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diff --git a/docs/0.15.1-incubating/misc/math-expr.html b/docs/0.15.1-incubating/misc/math-expr.html
index 97ec0fa..a4fffaa 100644
--- a/docs/0.15.1-incubating/misc/math-expr.html
+++ b/docs/0.15.1-incubating/misc/math-expr.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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@@ -561,7 +561,7 @@
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     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.1-incubating/misc/papers-and-talks.html b/docs/0.15.1-incubating/misc/papers-and-talks.html
index 7ecf730..c9094ee 100644
--- a/docs/0.15.1-incubating/misc/papers-and-talks.html
+++ b/docs/0.15.1-incubating/misc/papers-and-talks.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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@@ -185,7 +185,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
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diff --git a/docs/0.15.1-incubating/operations/alerts.html b/docs/0.15.1-incubating/operations/alerts.html
index 5681539..10c7bf9 100644
--- a/docs/0.15.1-incubating/operations/alerts.html
+++ b/docs/0.15.1-incubating/operations/alerts.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -184,7 +184,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.1-incubating/operations/api-reference.html b/docs/0.15.1-incubating/operations/api-reference.html
index 8b42513..bb980c3 100644
--- a/docs/0.15.1-incubating/operations/api-reference.html
+++ b/docs/0.15.1-incubating/operations/api-reference.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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@@ -1173,7 +1173,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.1-incubating/operations/basic-cluster-tuning.html b/docs/0.15.1-incubating/operations/basic-cluster-tuning.html
index 564bf52..f8d12d6 100644
--- a/docs/0.15.1-incubating/operations/basic-cluster-tuning.html
+++ b/docs/0.15.1-incubating/operations/basic-cluster-tuning.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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@@ -537,7 +537,7 @@
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     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.1-incubating/operations/deep-storage-migration.html b/docs/0.15.1-incubating/operations/deep-storage-migration.html
index 06e666d..6ba93cf 100644
--- a/docs/0.15.1-incubating/operations/deep-storage-migration.html
+++ b/docs/0.15.1-incubating/operations/deep-storage-migration.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -210,7 +210,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.1-incubating/operations/druid-console.html b/docs/0.15.1-incubating/operations/druid-console.html
index 527f1fb..434486e 100644
--- a/docs/0.15.1-incubating/operations/druid-console.html
+++ b/docs/0.15.1-incubating/operations/druid-console.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -258,7 +258,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.1-incubating/operations/dump-segment.html b/docs/0.15.1-incubating/operations/dump-segment.html
index 793625b..df55fb7 100644
--- a/docs/0.15.1-incubating/operations/dump-segment.html
+++ b/docs/0.15.1-incubating/operations/dump-segment.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -285,7 +285,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.1-incubating/operations/export-metadata.html b/docs/0.15.1-incubating/operations/export-metadata.html
index b836aa1..8f2c11f 100644
--- a/docs/0.15.1-incubating/operations/export-metadata.html
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -324,7 +324,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.1-incubating/operations/getting-started.html b/docs/0.15.1-incubating/operations/getting-started.html
index 0433e1a..51f87cb 100644
--- a/docs/0.15.1-incubating/operations/getting-started.html
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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@@ -193,7 +193,7 @@
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     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.1-incubating/operations/high-availability.html b/docs/0.15.1-incubating/operations/high-availability.html
index 217aeb9..0d257bb 100644
--- a/docs/0.15.1-incubating/operations/high-availability.html
+++ b/docs/0.15.1-incubating/operations/high-availability.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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@@ -186,7 +186,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.1-incubating/operations/http-compression.html b/docs/0.15.1-incubating/operations/http-compression.html
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+++ b/docs/0.15.1-incubating/operations/http-compression.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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@@ -192,7 +192,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
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diff --git a/docs/0.15.1-incubating/operations/including-extensions.html b/docs/0.15.1-incubating/operations/including-extensions.html
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
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diff --git a/docs/0.15.1-incubating/operations/insert-segment-to-db.html b/docs/0.15.1-incubating/operations/insert-segment-to-db.html
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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@@ -195,7 +195,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.1-incubating/operations/management-uis.html b/docs/0.15.1-incubating/operations/management-uis.html
index 2f0eed0..2817fa4 100644
--- a/docs/0.15.1-incubating/operations/management-uis.html
+++ b/docs/0.15.1-incubating/operations/management-uis.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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@@ -214,7 +214,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.1-incubating/operations/metadata-migration.html b/docs/0.15.1-incubating/operations/metadata-migration.html
index 4f76b00..c6c5ccb 100644
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+++ b/docs/0.15.1-incubating/operations/metadata-migration.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -229,7 +229,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.1-incubating/operations/metrics.html b/docs/0.15.1-incubating/operations/metrics.html
index 99f6919..71f262d 100644
--- a/docs/0.15.1-incubating/operations/metrics.html
+++ b/docs/0.15.1-incubating/operations/metrics.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -1178,7 +1178,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.1-incubating/operations/other-hadoop.html b/docs/0.15.1-incubating/operations/other-hadoop.html
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--- a/docs/0.15.1-incubating/operations/other-hadoop.html
+++ b/docs/0.15.1-incubating/operations/other-hadoop.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -431,7 +431,7 @@
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     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.1-incubating/operations/password-provider.html b/docs/0.15.1-incubating/operations/password-provider.html
index 525d654..7060eb6 100644
--- a/docs/0.15.1-incubating/operations/password-provider.html
+++ b/docs/0.15.1-incubating/operations/password-provider.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -210,7 +210,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.1-incubating/operations/pull-deps.html b/docs/0.15.1-incubating/operations/pull-deps.html
index fbbf38a..24bbf2b 100644
--- a/docs/0.15.1-incubating/operations/pull-deps.html
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -283,7 +283,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.1-incubating/operations/recommendations.html b/docs/0.15.1-incubating/operations/recommendations.html
index 7f204ce..e298915 100644
--- a/docs/0.15.1-incubating/operations/recommendations.html
+++ b/docs/0.15.1-incubating/operations/recommendations.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -233,7 +233,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.1-incubating/operations/reset-cluster.html b/docs/0.15.1-incubating/operations/reset-cluster.html
index cd33988..7616a10 100644
--- a/docs/0.15.1-incubating/operations/reset-cluster.html
+++ b/docs/0.15.1-incubating/operations/reset-cluster.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -209,7 +209,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.1-incubating/operations/rolling-updates.html b/docs/0.15.1-incubating/operations/rolling-updates.html
index 8c0765d..debb4dd 100644
--- a/docs/0.15.1-incubating/operations/rolling-updates.html
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -248,7 +248,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.1-incubating/operations/rule-configuration.html b/docs/0.15.1-incubating/operations/rule-configuration.html
index aa96c49..45212ef 100644
--- a/docs/0.15.1-incubating/operations/rule-configuration.html
+++ b/docs/0.15.1-incubating/operations/rule-configuration.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -369,7 +369,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.1-incubating/operations/segment-optimization.html b/docs/0.15.1-incubating/operations/segment-optimization.html
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--- a/docs/0.15.1-incubating/operations/segment-optimization.html
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -247,7 +247,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.1-incubating/operations/single-server.html b/docs/0.15.1-incubating/operations/single-server.html
index 982f070..2e52055 100644
--- a/docs/0.15.1-incubating/operations/single-server.html
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -216,7 +216,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.1-incubating/operations/tls-support.html b/docs/0.15.1-incubating/operations/tls-support.html
index 9230e5e..8d8a048 100644
--- a/docs/0.15.1-incubating/operations/tls-support.html
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -388,7 +388,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.1-incubating/operations/use_sbt_to_build_fat_jar.html b/docs/0.15.1-incubating/operations/use_sbt_to_build_fat_jar.html
index 797a497..1d3f60f 100644
--- a/docs/0.15.1-incubating/operations/use_sbt_to_build_fat_jar.html
+++ b/docs/0.15.1-incubating/operations/use_sbt_to_build_fat_jar.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -269,7 +269,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.1-incubating/querying/aggregations.html b/docs/0.15.1-incubating/querying/aggregations.html
index 5de1753..ee76314 100644
--- a/docs/0.15.1-incubating/querying/aggregations.html
+++ b/docs/0.15.1-incubating/querying/aggregations.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -450,7 +450,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.1-incubating/querying/caching.html b/docs/0.15.1-incubating/querying/caching.html
index 7173a6b..db3da41 100644
--- a/docs/0.15.1-incubating/querying/caching.html
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -208,7 +208,7 @@
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     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.1-incubating/querying/datasource.html b/docs/0.15.1-incubating/querying/datasource.html
index ffb38ad..01212dc 100644
--- a/docs/0.15.1-incubating/querying/datasource.html
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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@@ -201,7 +201,7 @@
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     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.1-incubating/querying/datasourcemetadataquery.html b/docs/0.15.1-incubating/querying/datasourcemetadataquery.html
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -215,7 +215,7 @@
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     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.1-incubating/querying/dimensionspecs.html b/docs/0.15.1-incubating/querying/dimensionspecs.html
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -627,7 +627,7 @@
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     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.1-incubating/querying/filters.html b/docs/0.15.1-incubating/querying/filters.html
index ba0c1ce..d28d1ef 100644
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -766,7 +766,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.1-incubating/querying/granularities.html b/docs/0.15.1-incubating/querying/granularities.html
index 0752055..e97a15d 100644
--- a/docs/0.15.1-incubating/querying/granularities.html
+++ b/docs/0.15.1-incubating/querying/granularities.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -527,7 +527,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.1-incubating/querying/groupbyquery.html b/docs/0.15.1-incubating/querying/groupbyquery.html
index 78aeee8..52a1cbe 100644
--- a/docs/0.15.1-incubating/querying/groupbyquery.html
+++ b/docs/0.15.1-incubating/querying/groupbyquery.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -775,7 +775,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.1-incubating/querying/having.html b/docs/0.15.1-incubating/querying/having.html
index 46b23bd..1868183 100644
--- a/docs/0.15.1-incubating/querying/having.html
+++ b/docs/0.15.1-incubating/querying/having.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -371,7 +371,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.1-incubating/querying/hll-old.html b/docs/0.15.1-incubating/querying/hll-old.html
index 01811f0..e934c76 100644
--- a/docs/0.15.1-incubating/querying/hll-old.html
+++ b/docs/0.15.1-incubating/querying/hll-old.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -265,7 +265,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.1-incubating/querying/joins.html b/docs/0.15.1-incubating/querying/joins.html
index 66a8da0..4fdf67b 100644
--- a/docs/0.15.1-incubating/querying/joins.html
+++ b/docs/0.15.1-incubating/querying/joins.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -201,7 +201,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.1-incubating/querying/limitspec.html b/docs/0.15.1-incubating/querying/limitspec.html
index 9cacb31..e7e8e9f 100644
--- a/docs/0.15.1-incubating/querying/limitspec.html
+++ b/docs/0.15.1-incubating/querying/limitspec.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -193,7 +193,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.1-incubating/querying/lookups.html b/docs/0.15.1-incubating/querying/lookups.html
index 8cb131b..3ec21ad 100644
--- a/docs/0.15.1-incubating/querying/lookups.html
+++ b/docs/0.15.1-incubating/querying/lookups.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -651,7 +651,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.1-incubating/querying/multi-value-dimensions.html b/docs/0.15.1-incubating/querying/multi-value-dimensions.html
index 4ad955b..f3ba62d 100644
--- a/docs/0.15.1-incubating/querying/multi-value-dimensions.html
+++ b/docs/0.15.1-incubating/querying/multi-value-dimensions.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -456,7 +456,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.1-incubating/querying/multitenancy.html b/docs/0.15.1-incubating/querying/multitenancy.html
index d7758df..d82599e 100644
--- a/docs/0.15.1-incubating/querying/multitenancy.html
+++ b/docs/0.15.1-incubating/querying/multitenancy.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -249,7 +249,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.1-incubating/querying/post-aggregations.html b/docs/0.15.1-incubating/querying/post-aggregations.html
index 5860622..f2d3014 100644
--- a/docs/0.15.1-incubating/querying/post-aggregations.html
+++ b/docs/0.15.1-incubating/querying/post-aggregations.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -336,7 +336,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.1-incubating/querying/query-context.html b/docs/0.15.1-incubating/querying/query-context.html
index 17b2e71..8750156 100644
--- a/docs/0.15.1-incubating/querying/query-context.html
+++ b/docs/0.15.1-incubating/querying/query-context.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -288,7 +288,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.1-incubating/querying/querying.html b/docs/0.15.1-incubating/querying/querying.html
index 2531f77..d64718c 100644
--- a/docs/0.15.1-incubating/querying/querying.html
+++ b/docs/0.15.1-incubating/querying/querying.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -311,7 +311,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.1-incubating/querying/scan-query.html b/docs/0.15.1-incubating/querying/scan-query.html
index adb9000..249ada0 100644
--- a/docs/0.15.1-incubating/querying/scan-query.html
+++ b/docs/0.15.1-incubating/querying/scan-query.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -449,7 +449,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.1-incubating/querying/searchquery.html b/docs/0.15.1-incubating/querying/searchquery.html
index 4105e8f..a82aeb4 100644
--- a/docs/0.15.1-incubating/querying/searchquery.html
+++ b/docs/0.15.1-incubating/querying/searchquery.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -343,7 +343,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.1-incubating/querying/searchqueryspec.html b/docs/0.15.1-incubating/querying/searchqueryspec.html
index 9999a54..cdb629c 100644
--- a/docs/0.15.1-incubating/querying/searchqueryspec.html
+++ b/docs/0.15.1-incubating/querying/searchqueryspec.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -205,7 +205,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.1-incubating/querying/segmentmetadataquery.html b/docs/0.15.1-incubating/querying/segmentmetadataquery.html
index 2020efc..8de1092 100644
--- a/docs/0.15.1-incubating/querying/segmentmetadataquery.html
+++ b/docs/0.15.1-incubating/querying/segmentmetadataquery.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -371,7 +371,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.1-incubating/querying/select-query.html b/docs/0.15.1-incubating/querying/select-query.html
index dec6406..46db9ee 100644
--- a/docs/0.15.1-incubating/querying/select-query.html
+++ b/docs/0.15.1-incubating/querying/select-query.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -438,7 +438,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.1-incubating/querying/sorting-orders.html b/docs/0.15.1-incubating/querying/sorting-orders.html
index b705fe0..1132a4f 100644
--- a/docs/0.15.1-incubating/querying/sorting-orders.html
+++ b/docs/0.15.1-incubating/querying/sorting-orders.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -203,7 +203,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.1-incubating/querying/sql.html b/docs/0.15.1-incubating/querying/sql.html
index d6faedf..11a3024 100644
--- a/docs/0.15.1-incubating/querying/sql.html
+++ b/docs/0.15.1-incubating/querying/sql.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -1713,7 +1713,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.1-incubating/querying/timeboundaryquery.html b/docs/0.15.1-incubating/querying/timeboundaryquery.html
index a39247c..ef4eb94 100644
--- a/docs/0.15.1-incubating/querying/timeboundaryquery.html
+++ b/docs/0.15.1-incubating/querying/timeboundaryquery.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -222,7 +222,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
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diff --git a/docs/0.15.1-incubating/querying/timeseriesquery.html b/docs/0.15.1-incubating/querying/timeseriesquery.html
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@@ -121,7 +121,7 @@
       
 
       
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-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
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-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
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diff --git a/docs/0.15.1-incubating/querying/topnquery.html b/docs/0.15.1-incubating/querying/topnquery.html
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
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-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
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-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
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diff --git a/docs/0.15.1-incubating/tutorials/cluster.html b/docs/0.15.1-incubating/tutorials/cluster.html
index 9400286..2219ee1 100644
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
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diff --git a/docs/0.15.1-incubating/tutorials/index.html b/docs/0.15.1-incubating/tutorials/index.html
index 6c59dcb..020dd85 100644
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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@@ -340,7 +340,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.1-incubating/tutorials/tutorial-batch-hadoop.html b/docs/0.15.1-incubating/tutorials/tutorial-batch-hadoop.html
index 9ea6ad9..549e95b 100644
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
       <div class="row">
@@ -359,7 +359,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.1-incubating/tutorials/tutorial-batch.html b/docs/0.15.1-incubating/tutorials/tutorial-batch.html
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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@@ -389,7 +389,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.1-incubating/tutorials/tutorial-compaction.html b/docs/0.15.1-incubating/tutorials/tutorial-compaction.html
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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@@ -297,7 +297,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.1-incubating/tutorials/tutorial-delete-data.html b/docs/0.15.1-incubating/tutorials/tutorial-delete-data.html
index 9852c69..cdc6f8e 100644
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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@@ -302,7 +302,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.1-incubating/tutorials/tutorial-ingestion-spec.html b/docs/0.15.1-incubating/tutorials/tutorial-ingestion-spec.html
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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@@ -745,7 +745,7 @@
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-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.1-incubating/tutorials/tutorial-kafka.html b/docs/0.15.1-incubating/tutorials/tutorial-kafka.html
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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@@ -307,7 +307,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.1-incubating/tutorials/tutorial-kerberos-hadoop.html b/docs/0.15.1-incubating/tutorials/tutorial-kerberos-hadoop.html
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+++ b/docs/0.15.1-incubating/tutorials/tutorial-kerberos-hadoop.html
@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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@@ -258,7 +258,7 @@
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-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.1-incubating/tutorials/tutorial-query.html b/docs/0.15.1-incubating/tutorials/tutorial-query.html
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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@@ -411,7 +411,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.1-incubating/tutorials/tutorial-retention.html b/docs/0.15.1-incubating/tutorials/tutorial-retention.html
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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@@ -258,7 +258,7 @@
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.1-incubating/tutorials/tutorial-rollup.html b/docs/0.15.1-incubating/tutorials/tutorial-rollup.html
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.1-incubating/tutorials/tutorial-tranquility.html b/docs/0.15.1-incubating/tutorials/tutorial-tranquility.html
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.1-incubating/tutorials/tutorial-transform-spec.html b/docs/0.15.1-incubating/tutorials/tutorial-transform-spec.html
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@@ -121,7 +121,7 @@
       
 
       
-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/docs/0.15.1-incubating/tutorials/tutorial-update-data.html b/docs/0.15.1-incubating/tutorials/tutorial-update-data.html
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-      <p> Looking for the <a href="/docs/0.18.1/">latest stable documentation</a>?</p>
+      <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>
       
 
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     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
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diff --git a/docs/0.20.0/About-Experimental-Features.html b/docs/0.20.0/About-Experimental-Features.html
new file mode 100644
index 0000000..4c16ee2
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+<meta charset="utf-8">
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+<p>We are not experts on search systems, if anything is incorrect about our portrayal, please let us know on the mailing list or via some other means.</p>
+<p>Elasticsearch is a search system based on Apache Lucene. It provides full text search for schema-free documents
+and provides access to raw event level data. Elasticsearch is increasingly adding more support for analytics and aggregations.
+<a href="https://groups.google.com/forum/#!msg/druid-development/nlpwTHNclj8/sOuWlKOzPpYJ">Some members of the community</a> have pointed out
+the resource requirements for data ingestion and aggregation in Elasticsearch is much higher than those of Druid.</p>
+<p>Elasticsearch also does not support data summarization/roll-up at ingestion time, which can compact the data that needs to be
+stored up to 100x with real-world data sets. This leads to Elasticsearch having greater storage requirements.</p>
+<p>Druid focuses on OLAP work flows. Druid is optimized for high performance (fast aggregation and ingestion) at low cost,
+and supports a wide range of analytic operations. Druid has some basic search support for structured event data, but does not support
+full text search. Druid also does not support completely unstructured data. Measures must be defined in a Druid schema such that
+summarization/roll-up can be done.</p>
+</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/0.20.0/misc/papers-and-talks.html"><span class="arrow-prev">← </span><span>Papers</span></a><a class="docs-next button" href="/docs/0.20.0/comparisons/druid-vs-key-value.html"><span class="function-name-prevnext">Apache Druid vs. Key/Value Stores (HBase/Cassandra/OpenTSDB)</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"></nav></div><footer class="nav-footer druid-footer" id="footer"><div class="container"><div class="text-center"><p><a href="/technology">Technology</a> · <a href="/use-cases">Use Cases</a> · <a href="/druid-powered">Powered by Druid</a> · <a href="/docs/0.20.0/latest">Docs</a> · <a href="/community/">Community</a> · <a href="/downloads.html">Download</a> · <a href="/faq">FAQ</a></p></div><div class="text-center"><a title="Join the user group" href="https://groups.google.com/forum/#!forum/druid-user" target="_blank"><span class="fa fa-comments"></span></a> · <a title="Follow Druid" href="https://twitter.com/druidio" target="_blank"><span class="fab fa-twitter"></span></a> · <a title="Download via Apache" href="https://www.apache.org/dyn/closer.cgi?path=/incubator/druid/{{ site.druid_versions[0].versions[0].version }}/apache-druid-{{ site.druid_versions[0].versions[0].version }}-bin.tar.gz" target="_blank"><span class="fas fa-feather"></span></a> · <a title="GitHub" href="https://github.com/apache/druid" target="_blank"><span class="fab fa-github"></span></a></div><div class="text-center license">Copyright © 2019 <a href="https://www.apache.org/" target="_blank">Apache Software Foundation</a>.<br/>Except where otherwise noted, licensed under <a rel="license" href="http://creativecommons.org/licenses/by-sa/4.0/">CC BY-SA 4.0</a>.<br/>Apache Druid, Druid, and the Druid logo are either registered trademarks or trademarks of The Apache Software Foundation in the United States and other countries.</div></div></footer></div><script type="text/javascript" src="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.js"></script><script>
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+<p>Druid is highly optimized for scans and aggregations, it supports arbitrarily deep drill downs into data sets. This same functionality
+is supported in key/value stores in 2 ways:</p>
+<ol>
+<li>Pre-compute all permutations of possible user queries</li>
+<li>Range scans on event data</li>
+</ol>
+<p>When pre-computing results, the key is the exact parameters of the query, and the value is the result of the query.
+The queries return extremely quickly, but at the cost of flexibility, as ad-hoc exploratory queries are not possible with
+pre-computing every possible query permutation. Pre-computing all permutations of all ad-hoc queries leads to result sets
+that grow exponentially with the number of columns of a data set, and pre-computing queries for complex real-world data sets
+can require hours of pre-processing time.</p>
+<p>The other approach to using key/value stores for aggregations to use the dimensions of an event as the key and the event measures as the value.
+Aggregations are done by issuing range scans on this data. Timeseries specific databases such as OpenTSDB use this approach.
+One of the limitations here is that the key/value storage model does not have indexes for any kind of filtering other than prefix ranges,
+which can be used to filter a query down to a metric and time range, but cannot resolve complex predicates to narrow the exact data to scan.
+When the number of rows to scan gets large, this limitation can greatly reduce performance. It is also harder to achieve good
+locality with key/value stores because most don’t support pushing down aggregates to the storage layer.</p>
+<p>For arbitrary exploration of data (flexible data filtering), Druid's custom column format enables ad-hoc queries without pre-computation. The format
+also enables fast scans on columns, which is important for good aggregation performance.</p>
+</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/0.20.0/comparisons/druid-vs-elasticsearch.html"><span class="arrow-prev">← </span><span>Apache Druid vs Elasticsearch</span></a><a class="docs-next button" href="/docs/0.20.0/comparisons/druid-vs-kudu.html"><span>Apache Druid vs Kudu</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"></nav></div><footer class="nav-footer druid-footer" id="footer"><div class="container"><div class="text-center"><p><a href="/technology">Technology</a> · <a href="/use-cases">Use Cases</a> · <a href="/druid-powered">Powered by Druid</a> · <a href="/docs/0.20.0/latest">Docs</a> · <a href="/community/">Community</a> · <a href="/downloads.html">Download</a> · <a href="/faq">FAQ</a></p></div><div class="text-center"><a title="Join the user group" href="https://groups.google.com/forum/#!forum/druid-user" target="_blank"><span class="fa fa-comments"></span></a> · <a title="Follow Druid" href="https://twitter.com/druidio" target="_blank"><span class="fab fa-twitter"></span></a> · <a title="Download via Apache" href="https://www.apache.org/dyn/closer.cgi?path=/incubator/druid/{{ site.druid_versions[0].versions[0].version }}/apache-druid-{{ site.druid_versions[0].versions[0].version }}-bin.tar.gz" target="_blank"><span class="fas fa-feather"></span></a> · <a title="GitHub" href="https://github.com/apache/druid" target="_blank"><span class="fab fa-github"></span></a></div><div class="text-center license">Copyright © 2019 <a href="https://www.apache.org/" target="_blank">Apache Software Foundation</a>.<br/>Except where otherwise noted, licensed under <a rel="license" href="http://creativecommons.org/licenses/by-sa/4.0/">CC BY-SA 4.0</a>.<br/>Apache Druid, Druid, and the Druid logo are either registered trademarks or trademarks of The Apache Software Foundation in the United States and other countries.</div></div></footer></div><script type="text/javascript" src="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.js"></script><script>
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+<p>Kudu's storage format enables single row updates, whereas updates to existing Druid segments requires recreating the segment, so theoretically
+the process for updating old values should be higher latency in Druid. However, the requirements in Kudu for maintaining extra head space to store
+updates as well as organizing data by id instead of time has the potential to introduce some extra latency and accessing
+of data that is not need to answer a query at query time.</p>
+<p>Druid summarizes/rollups up data at ingestion time, which in practice reduces the raw data that needs to be
+stored significantly (up to 40 times on average), and increases performance of scanning raw data significantly.
+Druid segments also contain bitmap indexes for fast filtering, which Kudu does not currently support.
+Druid's segment architecture is heavily geared towards fast aggregates and filters, and for OLAP workflows. Appends are very
+fast in Druid, whereas updates of older data is higher latency. This is by design as the data Druid is good for is typically event data,
+and does not need to be updated too frequently. Kudu supports arbitrary primary keys with uniqueness constraints, and
+efficient lookup by ranges of those keys. Kudu chooses not to include the execution engine, but supports sufficient
+operations so as to allow node-local processing from the execution engines. This means that Kudu can support multiple frameworks on the same data (e.g., MR, Spark, and SQL).
+Druid includes its own query layer that allows it to push down aggregations and computations directly to data processes for faster query processing.</p>
+</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/0.20.0/comparisons/druid-vs-key-value.html"><span class="arrow-prev">← </span><span class="function-name-prevnext">Apache Druid vs. Key/Value Stores (HBase/Cassandra/OpenTSDB)</span></a><a class="docs-next button" href="/docs/0.20.0/comparisons/druid-vs-redshift.html"><span>Apache Druid vs Redshift</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"></nav></div><footer class="nav-footer druid-footer" id="footer"><div class="container"><div class="text-center"><p><a href="/technology">Technology</a> · <a href="/use-cases">Use Cases</a> · <a href="/druid-powered">Powered by Druid</a> · <a href="/docs/0.20.0/latest">Docs</a> · <a href="/community/">Community</a> · <a href="/downloads.html">Download</a> · <a href="/faq">FAQ</a></p></div><div class="text-center"><a title="Join the user group" href="https://groups.google.com/forum/#!forum/druid-user" target="_blank"><span class="fa fa-comments"></span></a> · <a title="Follow Druid" href="https://twitter.com/druidio" target="_blank"><span class="fab fa-twitter"></span></a> · <a title="Download via Apache" href="https://www.apache.org/dyn/closer.cgi?path=/incubator/druid/{{ site.druid_versions[0].versions[0].version }}/apache-druid-{{ site.druid_versions[0].versions[0].version }}-bin.tar.gz" target="_blank"><span class="fas fa-feather"></span></a> · <a title="GitHub" href="https://github.com/apache/druid" target="_blank"><span class="fab fa-github"></span></a></div><div class="text-center license">Copyright © 2019 <a href="https://www.apache.org/" target="_blank">Apache Software Foundation</a>.<br/>Except where otherwise noted, licensed under <a rel="license" href="http://creativecommons.org/licenses/by-sa/4.0/">CC BY-SA 4.0</a>.<br/>Apache Druid, Druid, and the Druid logo are either registered trademarks or trademarks of The Apache Software Foundation in the United States and other countries.</div></div></footer></div><script type="text/javascript" src="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.js"></script><script>
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+<h3><a class="anchor" aria-hidden="true" id="how-does-druid-compare-to-redshift"></a><a href="#how-does-druid-compare-to-redshift" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>How does Druid compare to Redshift?</h3>
+<p>In terms of drawing a differentiation, Redshift started out as ParAccel (Actian), which Amazon is licensing and has since heavily modified.</p>
+<p>Aside from potential performance differences, there are some functional differences:</p>
+<h3><a class="anchor" aria-hidden="true" id="real-time-data-ingestion"></a><a href="#real-time-data-ingestion" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Real-time data ingestion</h3>
+<p>Because Druid is optimized to provide insight against massive quantities of streaming data; it is able to load and aggregate data in real-time.</p>
+<p>Generally traditional data warehouses including column stores work only with batch ingestion and are not optimal for streaming data in regularly.</p>
+<h3><a class="anchor" aria-hidden="true" id="druid-is-a-read-oriented-analytical-data-store"></a><a href="#druid-is-a-read-oriented-analytical-data-store" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Druid is a read oriented analytical data store</h3>
+<p>Druid’s write semantics are not as fluid and does not support full joins (we support large table to small table joins). Redshift provides full SQL support including joins and insert/update statements.</p>
+<h3><a class="anchor" aria-hidden="true" id="data-distribution-model"></a><a href="#data-distribution-model" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Data distribution model</h3>
+<p>Druid’s data distribution is segment-based and leverages a highly available &quot;deep&quot; storage such as S3 or HDFS. Scaling up (or down) does not require massive copy actions or downtime; in fact, losing any number of Historical processes does not result in data loss because new Historical processes can always be brought up by reading data from &quot;deep&quot; storage.</p>
+<p>To contrast, ParAccel’s data distribution model is hash-based. Expanding the cluster requires re-hashing the data across the nodes, making it difficult to perform without taking downtime. Amazon’s Redshift works around this issue with a multi-step process:</p>
+<ul>
+<li>set cluster into read-only mode</li>
+<li>copy data from cluster to new cluster that exists in parallel</li>
+<li>redirect traffic to new cluster</li>
+</ul>
+<h3><a class="anchor" aria-hidden="true" id="replication-strategy"></a><a href="#replication-strategy" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Replication strategy</h3>
+<p>Druid employs segment-level data distribution meaning that more processes can be added and rebalanced without having to perform a staged swap. The replication strategy also makes all replicas available for querying. Replication is done automatically and without any impact to performance.</p>
+<p>ParAccel’s hash-based distribution generally means that replication is conducted via hot spares. This puts a numerical limit on the number of nodes you can lose without losing data, and this replication strategy often does not allow the hot spare to help share query load.</p>
+<h3><a class="anchor" aria-hidden="true" id="indexing-strategy"></a><a href="#indexing-strategy" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Indexing strategy</h3>
+<p>Along with column oriented structures, Druid uses indexing structures to speed up query execution when a filter is provided. Indexing structures do increase storage overhead (and make it more difficult to allow for mutation), but they also significantly speed up queries.</p>
+<p>ParAccel does not appear to employ indexing strategies.</p>
+</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/0.20.0/comparisons/druid-vs-kudu.html"><span class="arrow-prev">← </span><span>Apache Druid vs Kudu</span></a><a class="docs-next button" href="/docs/0.20.0/comparisons/druid-vs-spark.html"><span>Apache Druid vs Spark</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"></nav></div><footer class="nav-footer druid-footer" id="footer"><div class="container"><div class="text-center"><p><a href="/technology">Technology</a> · <a href="/use-cases">Use Cases</a> · <a href="/druid-powered">Powered by Druid</a> · <a href="/docs/0.20.0/latest">Docs</a> · <a href="/community/">Community</a> · <a href="/downloads.html">Download</a> · <a href="/faq">FAQ</a></p></div><div class="text-center"><a title="Join the user group" href="https://groups.google.com/forum/#!forum/druid-user" target="_blank"><span class="fa fa-comments"></span></a> · <a title="Follow Druid" href="https://twitter.com/druidio" target="_blank"><span class="fab fa-twitter"></span></a> · <a title="Download via Apache" href="https://www.apache.org/dyn/closer.cgi?path=/incubator/druid/{{ site.druid_versions[0].versions[0].version }}/apache-druid-{{ site.druid_versions[0].versions[0].version }}-bin.tar.gz" target="_blank"><span class="fas fa-feather"></span></a> · <a title="GitHub" href="https://github.com/apache/druid" target="_blank"><span class="fab fa-github"></span></a></div><div class="text-center license">Copyright © 2019 <a href="https://www.apache.org/" target="_blank">Apache Software Foundation</a>.<br/>Except where otherwise noted, licensed under <a rel="license" href="http://creativecommons.org/licenses/by-sa/4.0/">CC BY-SA 4.0</a>.<br/>Apache Druid, Druid, and the Druid logo are either registered trademarks or trademarks of The Apache Software Foundation in the United States and other countries.</div></div></footer></div><script type="text/javascript" src="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.js"></script><script>
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+<p>Druid and Spark are complementary solutions as Druid can be used to accelerate OLAP queries in Spark.</p>
+<p>Spark is a general cluster computing framework initially designed around the concept of Resilient Distributed Datasets (RDDs).
+RDDs enable data reuse by persisting intermediate results
+in memory and enable Spark to provide fast computations for iterative algorithms.
+This is especially beneficial for certain work flows such as machine
+learning, where the same operation may be applied over and over
+again until some result is converged upon. The generality of Spark makes it very suitable as an engine to process (clean or transform) data.
+Although Spark provides the ability to query data through Spark SQL, much like Hadoop, the query latencies are not specifically targeted to be interactive (sub-second).</p>
+<p>Druid's focus is on extremely low latency queries, and is ideal for powering applications used by thousands of users, and where each query must
+return fast enough such that users can interactively explore through data. Druid fully indexes all data, and can act as a middle layer between Spark and your application.
+One typical setup seen in production is to process data in Spark, and load the processed data into Druid for faster access.</p>
+<p>For more information about using Druid and Spark together, including benchmarks of the two systems, please see:</p>
+<p><a href="https://www.linkedin.com/pulse/combining-druid-spark-interactive-flexible-analytics-scale-butani">https://www.linkedin.com/pulse/combining-druid-spark-interactive-flexible-analytics-scale-butani</a></p>
+</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/0.20.0/comparisons/druid-vs-redshift.html"><span class="arrow-prev">← </span><span>Apache Druid vs Redshift</span></a><a class="docs-next button" href="/docs/0.20.0/comparisons/druid-vs-sql-on-hadoop.html"><span>Apache Druid vs SQL-on-Hadoop</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"></nav></div><footer class="nav-footer druid-footer" id="footer"><div class="container"><div class="text-center"><p><a href="/technology">Technology</a> · <a href="/use-cases">Use Cases</a> · <a href="/druid-powered">Powered by Druid</a> · <a href="/docs/0.20.0/latest">Docs</a> · <a href="/community/">Community</a> · <a href="/downloads.html">Download</a> · <a href="/faq">FAQ</a></p></div><div class="text-center"><a title="Join the user group" href="https://groups.google.com/forum/#!forum/druid-user" target="_blank"><span class="fa fa-comments"></span></a> · <a title="Follow Druid" href="https://twitter.com/druidio" target="_blank"><span class="fab fa-twitter"></span></a> · <a title="Download via Apache" href="https://www.apache.org/dyn/closer.cgi?path=/incubator/druid/{{ site.druid_versions[0].versions[0].version }}/apache-druid-{{ site.druid_versions[0].versions[0].version }}-bin.tar.gz" target="_blank"><span class="fas fa-feather"></span></a> · <a title="GitHub" href="https://github.com/apache/druid" target="_blank"><span class="fab fa-github"></span></a></div><div class="text-center license">Copyright © 2019 <a href="https://www.apache.org/" target="_blank">Apache Software Foundation</a>.<br/>Except where otherwise noted, licensed under <a rel="license" href="http://creativecommons.org/licenses/by-sa/4.0/">CC BY-SA 4.0</a>.<br/>Apache Druid, Druid, and the Druid logo are either registered trademarks or trademarks of The Apache Software Foundation in the United States and other countries.</div></div></footer></div><script type="text/javascript" src="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.js"></script><script>
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+<p>SQL-on-Hadoop engines provide an
+execution engine for various data formats and data stores, and
+many can be made to push down computations down to Druid, while providing a SQL interface to Druid.</p>
+<p>For a direct comparison between the technologies and when to only use one or the other, things basically comes down to your
+product requirements and what the systems were designed to do.</p>
+<p>Druid was designed to</p>
+<ol>
+<li>be an always on service</li>
+<li>ingest data in real-time</li>
+<li>handle slice-n-dice style ad-hoc queries</li>
+</ol>
+<p>SQL-on-Hadoop engines generally sidestep Map/Reduce, instead querying data directly from HDFS or, in some cases, other storage systems.
+Some of these engines (including Impala and Presto) can be co-located with HDFS data nodes and coordinate with them to achieve data locality for queries.
+What does this mean?  We can talk about it in terms of three general areas</p>
+<ol>
+<li>Queries</li>
+<li>Data Ingestion</li>
+<li>Query Flexibility</li>
+</ol>
+<h3><a class="anchor" aria-hidden="true" id="queries"></a><a href="#queries" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Queries</h3>
+<p>Druid segments stores data in a custom column format. Segments are scanned directly as part of queries and each Druid server
+calculates a set of results that are eventually merged at the Broker level. This means the data that is transferred between servers
+are queries and results, and all computation is done internally as part of the Druid servers.</p>
+<p>Most SQL-on-Hadoop engines are responsible for query planning and execution for underlying storage layers and storage formats.
+They are processes that stay on even if there is no query running (eliminating the JVM startup costs from Hadoop MapReduce).
+Some (Impala/Presto) SQL-on-Hadoop engines have daemon processes that can be run where the data is stored, virtually eliminating network transfer costs. There is still
+some latency overhead (e.g. serialization/deserialization time) associated with pulling data from the underlying storage layer into the computation layer. We are unaware of exactly
+how much of a performance impact this makes.</p>
+<h3><a class="anchor" aria-hidden="true" id="data-ingestion"></a><a href="#data-ingestion" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Data Ingestion</h3>
+<p>Druid is built to allow for real-time ingestion of data.  You can ingest data and query it immediately upon ingestion,
+the latency between how quickly the event is reflected in the data is dominated by how long it takes to deliver the event to Druid.</p>
+<p>SQL-on-Hadoop, being based on data in HDFS or some other backing store, are limited in their data ingestion rates by the
+rate at which that backing store can make data available.  Generally, the backing store is the biggest bottleneck for
+how quickly data can become available.</p>
+<h3><a class="anchor" aria-hidden="true" id="query-flexibility"></a><a href="#query-flexibility" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Query Flexibility</h3>
+<p>Druid's query language is fairly low level and maps to how Druid operates internally. Although Druid can be combined with a high level query
+planner such as <a href="https://github.com/implydata/plywood">Plywood</a> to support most SQL queries and analytic SQL queries (minus joins among large tables),
+base Druid is less flexible than SQL-on-Hadoop solutions for generic processing.</p>
+<p>SQL-on-Hadoop support SQL style queries with full joins.</p>
+<h2><a class="anchor" aria-hidden="true" id="druid-vs-parquet"></a><a href="#druid-vs-parquet" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Druid vs Parquet</h2>
+<p>Parquet is a column storage format that is designed to work with SQL-on-Hadoop engines. Parquet doesn't have a query execution engine, and instead
+relies on external sources to pull data out of it.</p>
+<p>Druid's storage format is highly optimized for linear scans. Although Druid has support for nested data, Parquet's storage format is much
+more hierarchical, and is more designed for binary chunking. In theory, this should lead to faster scans in Druid.</p>
+</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/0.20.0/comparisons/druid-vs-spark.html"><span class="arrow-prev">← </span><span>Apache Druid vs Spark</span></a><a class="docs-next button" href="/docs/0.20.0/design/auth.html"><span>Authentication and Authorization</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#druid-vs-parquet">Druid vs Parquet</a></li></ul></nav></div><footer class="nav-footer druid-footer" id="footer"><div class="container"><div class="text-center"><p><a href="/technology">Technology</a> · <a href="/use-cases">Use Cases</a> · <a href="/druid-powered">Powered by Druid</a> · <a href="/docs/0.20.0/latest">Docs</a> · <a href="/community/">Community</a> · <a href="/downloads.html">Download</a> · <a href="/faq">FAQ</a></p></div><div class="text-center"><a title="Join the user group" href="https://groups.google.com/forum/#!forum/druid-user" target="_blank"><span class="fa fa-comments"></span></a> · <a title="Follow Druid" href="https://twitter.com/druidio" target="_blank"><span class="fab fa-twitter"></span></a> · <a title="Download via Apache" href="https://www.apache.org/dyn/closer.cgi?path=/incubator/druid/{{ site.druid_versions[0].versions[0].version }}/apache-druid-{{ site.druid_versions[0].versions[0].version }}-bin.tar.gz" target="_blank"><span class="fas fa-feather"></span></a> · <a title="GitHub" href="https://github.com/apache/druid" target="_blank"><span class="fab fa-github"></span></a></div><div class="text-center license">Copyright © 2019 <a href="https://www.apache.org/" target="_blank">Apache Software Foundation</a>.<br/>Except where otherwise noted, licensed under <a rel="license" href="http://creativecommons.org/licenses/by-sa/4.0/">CC BY-SA 4.0</a>.<br/>Apache Druid, Druid, and the Druid logo are either registered trademarks or trademarks of The Apache Software Foundation in the United States and other countries.</div></div></footer></div><script type="text/javascript" src="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.js"></script><script>
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+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Human-readable Byte Configuration Reference · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/0.20.0/configuration/human-readable-byte.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.20.0" /><meta property="og:title" content="Human-readable Byte Configuration Reference · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
+              window.dataLayer = window.dataLayer || [];
+              function gtag(){dataLayer.push(arguments); }
+              gtag('js', new Date());
+              gtag('config', 'UA-131010415-1');
+            </script><link rel="stylesheet" href="https://use.fontawesome.com/releases/v5.7.2/css/all.css"/><link rel="stylesheet" href="/css/code-block-buttons.css"/><script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/clipboard.js/2.0.4/clipboard.min.js"></script><script type="text/javascript" src="/js/code-block-buttons.js"></script><script src="/js/scrollSpy.js"></script><link rel="stylesheet" href="/css/main.css"/><script src="/js/codetabs.js"></script></head><body class="sideNavVisible separateOnPageNav"><div class="fixedHeaderContainer"><div class="headerWrapper wrapper"><header><a href="/"><img class="logo" src="/img/druid_nav.png" alt="Apache Druid"/></a><div class="navigationWrapper navigationSlider"><nav class="slidingNav"><ul class="nav-site nav-site-internal"><li class=""><a href="/technology" target="_self">Technology</a></li><li class=""><a href="/use-cases" target="_self">Use Cases</a></li><li class=""><a href="/druid-powered" target="_self">Powered By</a></li><li class=""><a href="/docs/0.20.0/design/index.html" target="_self">Docs</a></li><li class=""><a href="/community/" target="_self">Community</a></li><li class=""><a href="https://www.apache.org" target="_self">Apache</a></li><li class=""><a href="/downloads.html" target="_self">Download</a></li><li class="navSearchWrapper reactNavSearchWrapper"><input type="text" id="search_input_react" placeholder="Search" title="Search"/></li></ul></nav></div></header></div></div><div class="navPusher"><div class="docMainWrapper wrapper"><div class="container mainContainer docsContainer"><div class="wrapper"><div class="post"><header class="postHeader"><a class="edit-page-link button" href="https://github.com/apache/druid/edit/master/docs/configuration/human-readable-byte.md" target="_blank" rel="noreferrer noopener">Edit</a><h1 id="__docusaurus" class="postHeaderTitle">Human-readable Byte Configuration Reference</h1></header><article><div><span><!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+  -->
+<p>This page documents configuration properties related to bytes.</p>
+<p>These properties can be configured through 2 ways:</p>
+<ol>
+<li>a simple number in bytes</li>
+<li>a number with a unit suffix</li>
+</ol>
+<h2><a class="anchor" aria-hidden="true" id="a-number-in-bytes"></a><a href="#a-number-in-bytes" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>A number in bytes</h2>
+<p>Given that cache size is 3G, there's a configuration as below</p>
+<pre><code class="hljs css language-properties"><span class="hljs-comment"># 3G bytes = 3_000_000_000 bytes</span>
+<span class="hljs-meta">druid.cache.sizeInBytes</span>=<span class="hljs-string">3000000000 </span>
+</code></pre>
+<h2><a class="anchor" aria-hidden="true" id="a-number-with-a-unit-suffix"></a><a href="#a-number-with-a-unit-suffix" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>A number with a unit suffix</h2>
+<p>When you have to put a large number for some configuration as above, it is easy to make a mistake such as extra or missing 0s. Druid supports a better way, a number with a unit suffix.</p>
+<p>Given a disk of 1T, the configuration can be</p>
+<pre><code class="hljs css language-properties"><span class="hljs-meta">druid.segmentCache.locations</span>=<span class="hljs-string">[{"path":"/segment-cache","maxSize":"1t"}]</span>
+</code></pre>
+<p>Note: in above example, both <code>1t</code> and <code>1T</code> are acceptable since it's case-insensitive.</p>
+<h3><a class="anchor" aria-hidden="true" id="supported-units"></a><a href="#supported-units" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Supported Units</h3>
+<p>In the world of computer, a unit like <code>K</code> is ambiguous. It means 1000 or 1024 in different contexts, for more information please see <a href="https://en.wikipedia.org/wiki/Binary_prefix">Here</a>.</p>
+<p>To make it clear, the base of units are defined in Druid as below</p>
+<table>
+<thead>
+<tr><th>Unit</th><th>Description</th><th>Base</th></tr>
+</thead>
+<tbody>
+<tr><td>K</td><td>Kilo Decimal Byte</td><td>1_000</td></tr>
+<tr><td>M</td><td>Mega Decimal Byte</td><td>1_000_000</td></tr>
+<tr><td>G</td><td>Giga Decimal Byte</td><td>1_000_000_000</td></tr>
+<tr><td>T</td><td>Tera Decimal Byte</td><td>1_000_000_000_000</td></tr>
+<tr><td>P</td><td>Peta Decimal Byte</td><td>1_000_000_000_000_000</td></tr>
+<tr><td>KiB</td><td>Kilo Binary Byte</td><td>1024</td></tr>
+<tr><td>MiB</td><td>Mega Binary Byte</td><td>1024 * 1024</td></tr>
+<tr><td>GiB</td><td>Giga Binary Byte</td><td>1024 * 1024 * 1024</td></tr>
+<tr><td>TiB</td><td>Tera Binary Byte</td><td>1024 * 1024 * 1024 * 1024</td></tr>
+<tr><td>PiB</td><td>Peta Binary Byte</td><td>1024 * 1024 * 1024 * 1024 * 1024</td></tr>
+</tbody>
+</table>
+<p>Unit is case-insensitive. <code>k</code>, <code>kib</code>, <code>KiB</code>, <code>kiB</code> are all acceptable.</p>
+<p>Here are two examples</p>
+<pre><code class="hljs css language-properties"><span class="hljs-comment"># 1G bytes = 1_000_000_000 bytes</span>
+<span class="hljs-meta">druid.cache.sizeInBytes</span>=<span class="hljs-string">1g </span>
+</code></pre>
+<pre><code class="hljs css language-properties"><span class="hljs-comment"># 256MiB bytes = 256 * 1024 * 1024 bytes</span>
+<span class="hljs-meta">druid.cache.sizeInBytes</span>=<span class="hljs-string">256MiB </span>
+</code></pre>
+</span></div></article></div><div class="docs-prevnext"></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#a-number-in-bytes">A number in bytes</a></li><li><a href="#a-number-with-a-unit-suffix">A number with a unit suffix</a><ul class="toc-headings"><li><a href="#supported-units">Supported Units</a></li></ul></li></ul></nav></div><footer class="nav-footer druid-footer" id="footer"><div class="container"><div class="text-center"><p><a href="/technology">Technology</a> · <a href="/use-cases">Use Cases</a> · <a href="/druid-powered">Powered by Druid</a> · <a href="/docs/0.20.0/latest">Docs</a> · <a href="/community/">Community</a> · <a href="/downloads.html">Download</a> · <a href="/faq">FAQ</a></p></div><div class="text-center"><a title="Join the user group" href="https://groups.google.com/forum/#!forum/druid-user" target="_blank"><span class="fa fa-comments"></span></a> · <a title="Follow Druid" href="https://twitter.com/druidio" target="_blank"><span class="fab fa-twitter"></span></a> · <a title="Download via Apache" href="https://www.apache.org/dyn/closer.cgi?path=/incubator/druid/{{ site.druid_versions[0].versions[0].version }}/apache-druid-{{ site.druid_versions[0].versions[0].version }}-bin.tar.gz" target="_blank"><span class="fas fa-feather"></span></a> · <a title="GitHub" href="https://github.com/apache/druid" target="_blank"><span class="fab fa-github"></span></a></div><div class="text-center license">Copyright © 2019 <a href="https://www.apache.org/" target="_blank">Apache Software Foundation</a>.<br/>Except where otherwise noted, licensed under <a rel="license" href="http://creativecommons.org/licenses/by-sa/4.0/">CC BY-SA 4.0</a>.<br/>Apache Druid, Druid, and the Druid logo are either registered trademarks or trademarks of The Apache Software Foundation in the United States and other countries.</div></div></footer></div><script type="text/javascript" src="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.js"></script><script>
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+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Configuration reference · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/0.20.0/configuration/index.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.20.0" /><meta property="og:title" content="Configuration reference · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
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+  ~ Licensed to the Apache Software Foundation (ASF) under one
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+<p>This page documents all of the configuration properties for each Druid service type.</p>
+<h2><a class="anchor" aria-hidden="true" id="recommended-configuration-file-organization"></a><a href="#recommended-configuration-file-organization" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Recommended Configuration File Organization</h2>
+<p>A recommended way of organizing Druid configuration files can be seen in the <code>conf</code> directory in the Druid package root, shown below:</p>
+<pre><code class="hljs">$ <span class="hljs-keyword">ls</span> -R <span class="hljs-keyword">conf</span>
+druid
+
+<span class="hljs-keyword">conf</span>/druid:
+_common       broker        coordinator   historical    middleManager overlord
+
+<span class="hljs-keyword">conf</span>/druid/_common:
+common.<span class="hljs-keyword">runtime</span>.properties log4j2.xml
+
+<span class="hljs-keyword">conf</span>/druid/broker:
+jvm.config         <span class="hljs-keyword">runtime</span>.properties
+
+<span class="hljs-keyword">conf</span>/druid/coordinator:
+jvm.config         <span class="hljs-keyword">runtime</span>.properties
+
+<span class="hljs-keyword">conf</span>/druid/historica<span class="hljs-variable">l:</span>
+jvm.config         <span class="hljs-keyword">runtime</span>.properties
+
+<span class="hljs-keyword">conf</span>/druid/middleManager:
+jvm.config         <span class="hljs-keyword">runtime</span>.properties
+
+<span class="hljs-keyword">conf</span>/druid/overlord:
+jvm.config         <span class="hljs-keyword">runtime</span>.properties
+</code></pre>
+<p>Each directory has a <code>runtime.properties</code> file containing configuration properties for the specific Druid process corresponding to the directory (e.g., <code>historical</code>).</p>
+<p>The <code>jvm.config</code> files contain JVM flags such as heap sizing properties for each service.</p>
+<p>Common properties shared by all services are placed in <code>_common/common.runtime.properties</code>.</p>
+<h2><a class="anchor" aria-hidden="true" id="common-configurations"></a><a href="#common-configurations" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Common Configurations</h2>
+<p>The properties under this section are common configurations that should be shared across all Druid services in a cluster.</p>
+<h3><a class="anchor" aria-hidden="true" id="jvm-configuration-best-practices"></a><a href="#jvm-configuration-best-practices" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>JVM Configuration Best Practices</h3>
+<p>There are four JVM parameters that we set on all of our processes:</p>
+<ol>
+<li><code>-Duser.timezone=UTC</code> This sets the default timezone of the JVM to UTC. We always set this and do not test with other default timezones, so local timezones might work, but they also might uncover weird and interesting bugs. To issue queries in a non-UTC timezone, see <a href="../querying/granularities.html#period-granularities">query granularities</a></li>
+<li><code>-Dfile.encoding=UTF-8</code> This is similar to timezone, we test assuming UTF-8. Local encodings might work, but they also might result in weird and interesting bugs.</li>
+<li><code>-Djava.io.tmpdir=&lt;a path&gt;</code> Various parts of the system that interact with the file system do it via temporary files, and these files can get somewhat large. Many production systems are set up to have small (but fast) <code>/tmp</code> directories, which can be problematic with Druid so we recommend pointing the JVM’s tmp directory to something with a little more meat. This directory should not be volatile tmpfs. This directory should also have good read and write speed and hence NFS mount should strongly be avoided.</li>
+<li><code>-Djava.util.logging.manager=org.apache.logging.log4j.jul.LogManager</code> This allows log4j2 to handle logs for non-log4j2 components (like jetty) which use standard java logging.</li>
+</ol>
+<h3><a class="anchor" aria-hidden="true" id="extensions"></a><a href="#extensions" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Extensions</h3>
+<p>Many of Druid's external dependencies can be plugged in as modules. Extensions can be provided using the following configs:</p>
+<table>
+<thead>
+<tr><th>Property</th><th>Description</th><th>Default</th></tr>
+</thead>
+<tbody>
+<tr><td><code>druid.extensions.directory</code></td><td>The root extension directory where user can put extensions related files. Druid will load extensions stored under this directory.</td><td><code>extensions</code> (This is a relative path to Druid's working directory)</td></tr>
+<tr><td><code>druid.extensions.hadoopDependenciesDir</code></td><td>The root hadoop dependencies directory where user can put hadoop related dependencies files. Druid will load the dependencies based on the hadoop coordinate specified in the hadoop index task.</td><td><code>hadoop-dependencies</code> (This is a relative path to Druid's working directory</td></tr>
+<tr><td><code>druid.extensions.loadList</code></td><td>A JSON array of extensions to load from extension directories by Druid. If it is not specified, its value will be <code>null</code> and Druid will load all the extensions under <code>druid.extensions.directory</code>. If its value is empty list <code>[]</code>, then no extensions will be loaded at all. It is also allowed to specify absolute path of other custom extensions not stored in the common extensions directory.</td><td>null</td></tr>
+<tr><td><code>druid.extensions.searchCurrentClassloader</code></td><td>This is a boolean flag that determines if Druid will search the main classloader for extensions.  It defaults to true but can be turned off if you have reason to not automatically add all modules on the classpath.</td><td>true</td></tr>
+<tr><td><code>druid.extensions.useExtensionClassloaderFirst</code></td><td>This is a boolean flag that determines if Druid extensions should prefer loading classes from their own jars rather than jars bundled with Druid. If false, extensions must be compatible with classes provided by any jars bundled with Druid. If true, extensions may depend on conflicting versions.</td><td>false</td></tr>
+<tr><td><code>druid.extensions.hadoopContainerDruidClasspath</code></td><td>Hadoop Indexing launches hadoop jobs and this configuration provides way to explicitly set the user classpath for the hadoop job. By default this is computed automatically by druid based on the druid process classpath and set of extensions. However, sometimes you might want to be explicit to resolve dependency conflicts between druid and hadoop.</td><td>null</td></tr>
+<tr><td><code>druid.extensions.addExtensionsToHadoopContainer</code></td><td>Only applicable if <code>druid.extensions.hadoopContainerDruidClasspath</code> is provided. If set to true, then extensions specified in the loadList are added to hadoop container classpath. Note that when <code>druid.extensions.hadoopContainerDruidClasspath</code> is not provided then extensions are always added to hadoop container classpath.</td><td>false</td></tr>
+</tbody>
+</table>
+<h3><a class="anchor" aria-hidden="true" id="modules"></a><a href="#modules" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Modules</h3>
+<table>
+<thead>
+<tr><th>Property</th><th>Description</th><th>Default</th></tr>
+</thead>
+<tbody>
+<tr><td><code>druid.modules.excludeList</code></td><td>A JSON array of canonical class names (e.g., <code>&quot;org.apache.druid.somepackage.SomeModule&quot;</code>) of module classes which shouldn't be loaded, even if they are found in extensions specified by <code>druid.extensions.loadList</code>, or in the list of core modules specified to be loaded on a particular Druid process type. Useful when some useful extension contains some module, which shouldn't be loaded on some Druid process type because some dependencies of that module couldn't be satisfied.</td><td>[]</td></tr>
+</tbody>
+</table>
+<h3><a class="anchor" aria-hidden="true" id="zookeeper"></a><a href="#zookeeper" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Zookeeper</h3>
+<p>We recommend just setting the base ZK path and the ZK service host, but all ZK paths that Druid uses can be overwritten to absolute paths.</p>
+<table>
+<thead>
+<tr><th>Property</th><th>Description</th><th>Default</th></tr>
+</thead>
+<tbody>
+<tr><td><code>druid.zk.paths.base</code></td><td>Base Zookeeper path.</td><td><code>/druid</code></td></tr>
+<tr><td><code>druid.zk.service.host</code></td><td>The ZooKeeper hosts to connect to. This is a REQUIRED property and therefore a host address must be supplied.</td><td>none</td></tr>
+<tr><td><code>druid.zk.service.user</code></td><td>The username to authenticate with ZooKeeper. This is an optional property.</td><td>none</td></tr>
+<tr><td><code>druid.zk.service.pwd</code></td><td>The <a href="/docs/0.20.0/operations/password-provider.html">Password Provider</a> or the string password to authenticate with ZooKeeper. This is an optional property.</td><td>none</td></tr>
+<tr><td><code>druid.zk.service.authScheme</code></td><td>digest is the only authentication scheme supported.</td><td>digest</td></tr>
+</tbody>
+</table>
+<h4><a class="anchor" aria-hidden="true" id="zookeeper-behavior"></a><a href="#zookeeper-behavior" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Zookeeper Behavior</h4>
+<table>
+<thead>
+<tr><th>Property</th><th>Description</th><th>Default</th></tr>
+</thead>
+<tbody>
+<tr><td><code>druid.zk.service.sessionTimeoutMs</code></td><td>ZooKeeper session timeout, in milliseconds.</td><td><code>30000</code></td></tr>
+<tr><td><code>druid.zk.service.connectionTimeoutMs</code></td><td>ZooKeeper connection timeout, in milliseconds.</td><td><code>15000</code></td></tr>
+<tr><td><code>druid.zk.service.compress</code></td><td>Boolean flag for whether or not created Znodes should be compressed.</td><td><code>true</code></td></tr>
+<tr><td><code>druid.zk.service.acl</code></td><td>Boolean flag for whether or not to enable ACL security for ZooKeeper. If ACL is enabled, zNode creators will have all permissions.</td><td><code>false</code></td></tr>
+</tbody>
+</table>
+<h4><a class="anchor" aria-hidden="true" id="path-configuration"></a><a href="#path-configuration" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Path Configuration</h4>
+<p>Druid interacts with ZK through a set of standard path configurations. We recommend just setting the base ZK path, but all ZK paths that Druid uses can be overwritten to absolute paths.</p>
+<table>
+<thead>
+<tr><th>Property</th><th>Description</th><th>Default</th></tr>
+</thead>
+<tbody>
+<tr><td><code>druid.zk.paths.base</code></td><td>Base Zookeeper path.</td><td><code>/druid</code></td></tr>
+<tr><td><code>druid.zk.paths.propertiesPath</code></td><td>Zookeeper properties path.</td><td><code>${druid.zk.paths.base}/properties</code></td></tr>
+<tr><td><code>druid.zk.paths.announcementsPath</code></td><td>Druid process announcement path.</td><td><code>${druid.zk.paths.base}/announcements</code></td></tr>
+<tr><td><code>druid.zk.paths.liveSegmentsPath</code></td><td>Current path for where Druid processes announce their segments.</td><td><code>${druid.zk.paths.base}/segments</code></td></tr>
+<tr><td><code>druid.zk.paths.loadQueuePath</code></td><td>Entries here cause Historical processes to load and drop segments.</td><td><code>${druid.zk.paths.base}/loadQueue</code></td></tr>
+<tr><td><code>druid.zk.paths.coordinatorPath</code></td><td>Used by the Coordinator for leader election.</td><td><code>${druid.zk.paths.base}/coordinator</code></td></tr>
+<tr><td><code>druid.zk.paths.servedSegmentsPath</code></td><td>@Deprecated. Legacy path for where Druid processes announce their segments.</td><td><code>${druid.zk.paths.base}/servedSegments</code></td></tr>
+</tbody>
+</table>
+<p>The indexing service also uses its own set of paths. These configs can be included in the common configuration.</p>
+<table>
+<thead>
+<tr><th>Property</th><th>Description</th><th>Default</th></tr>
+</thead>
+<tbody>
+<tr><td><code>druid.zk.paths.indexer.base</code></td><td>Base zookeeper path for</td><td><code>${druid.zk.paths.base}/indexer</code></td></tr>
+<tr><td><code>druid.zk.paths.indexer.announcementsPath</code></td><td>Middle managers announce themselves here.</td><td><code>${druid.zk.paths.indexer.base}/announcements</code></td></tr>
+<tr><td><code>druid.zk.paths.indexer.tasksPath</code></td><td>Used to assign tasks to MiddleManagers.</td><td><code>${druid.zk.paths.indexer.base}/tasks</code></td></tr>
+<tr><td><code>druid.zk.paths.indexer.statusPath</code></td><td>Parent path for announcement of task statuses.</td><td><code>${druid.zk.paths.indexer.base}/status</code></td></tr>
+</tbody>
+</table>
+<p>If <code>druid.zk.paths.base</code> and <code>druid.zk.paths.indexer.base</code> are both set, and none of the other <code>druid.zk.paths.*</code> or <code>druid.zk.paths.indexer.*</code> values are set, then the other properties will be evaluated relative to their respective <code>base</code>.
+For example, if <code>druid.zk.paths.base</code> is set to <code>/druid1</code> and <code>druid.zk.paths.indexer.base</code> is set to <code>/druid2</code> then <code>druid.zk.paths.announcementsPath</code> will default to <code>/druid1/announcements</code> while <code>druid.zk.paths.indexer.announcementsPath</code> will default to <code>/druid2/announcements</code>.</p>
+<p>The following path is used for service discovery. It is <strong>not</strong> affected by <code>druid.zk.paths.base</code> and <strong>must</strong> be specified separately.</p>
+<table>
+<thead>
+<tr><th>Property</th><th>Description</th><th>Default</th></tr>
+</thead>
+<tbody>
+<tr><td><code>druid.discovery.curator.path</code></td><td>Services announce themselves under this ZooKeeper path.</td><td><code>/druid/discovery</code></td></tr>
+</tbody>
+</table>
+<h3><a class="anchor" aria-hidden="true" id="exhibitor"></a><a href="#exhibitor" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Exhibitor</h3>
+<p><a href="https://github.com/Netflix/exhibitor/wiki">Exhibitor</a> is a supervisor system for ZooKeeper.
+Exhibitor can dynamically scale-up/down the cluster of ZooKeeper servers.
+Druid can update self-owned list of ZooKeeper servers through Exhibitor without restarting.
+That is, it allows Druid to keep the connections of Exhibitor-supervised ZooKeeper servers.</p>
+<table>
+<thead>
+<tr><th>Property</th><th>Description</th><th>Default</th></tr>
+</thead>
+<tbody>
+<tr><td><code>druid.exhibitor.service.hosts</code></td><td>A JSON array which contains the hostnames of Exhibitor instances. Please specify this property if you want to use Exhibitor-supervised cluster.</td><td>none</td></tr>
+<tr><td><code>druid.exhibitor.service.port</code></td><td>The REST port used to connect to Exhibitor.</td><td><code>8080</code></td></tr>
+<tr><td><code>druid.exhibitor.service.restUriPath</code></td><td>The path of the REST call used to get the server set.</td><td><code>/exhibitor/v1/cluster/list</code></td></tr>
+<tr><td><code>druid.exhibitor.service.useSsl</code></td><td>Boolean flag for whether or not to use https protocol.</td><td><code>false</code></td></tr>
+<tr><td><code>druid.exhibitor.service.pollingMs</code></td><td>How often to poll the exhibitors for the list</td><td><code>10000</code></td></tr>
+</tbody>
+</table>
+<p>Note that <code>druid.zk.service.host</code> is used as a backup in case an Exhibitor instance can't be contacted and therefore should still be set.</p>
+<h3><a class="anchor" aria-hidden="true" id="tls"></a><a href="#tls" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>TLS</h3>
+<h4><a class="anchor" aria-hidden="true" id="general-configuration"></a><a href="#general-configuration" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>General Configuration</h4>
+<table>
+<thead>
+<tr><th>Property</th><th>Description</th><th>Default</th></tr>
+</thead>
+<tbody>
+<tr><td><code>druid.enablePlaintextPort</code></td><td>Enable/Disable HTTP connector.</td><td><code>true</code></td></tr>
+<tr><td><code>druid.enableTlsPort</code></td><td>Enable/Disable HTTPS connector.</td><td><code>false</code></td></tr>
+</tbody>
+</table>
+<p>Although not recommended but both HTTP and HTTPS connectors can be enabled at a time and respective ports are configurable using <code>druid.plaintextPort</code>
+and <code>druid.tlsPort</code> properties on each process. Please see <code>Configuration</code> section of individual processes to check the valid and default values for these ports.</p>
+<h4><a class="anchor" aria-hidden="true" id="jetty-server-tls-configuration"></a><a href="#jetty-server-tls-configuration" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Jetty Server TLS Configuration</h4>
+<p>Druid uses Jetty as an embedded web server. To get familiar with TLS/SSL in general and related concepts like Certificates etc.
+reading this <a href="http://www.eclipse.org/jetty/documentation/9.4.x/configuring-ssl.html">Jetty documentation</a> might be helpful.
+To get more in depth knowledge of TLS/SSL support in Java in general, please refer to this <a href="http://docs.oracle.com/javase/8/docs/technotes/guides/security/jsse/JSSERefGuide.html">guide</a>.
+The documentation <a href="http://www.eclipse.org/jetty/documentation/9.4.x/configuring-ssl.html#configuring-sslcontextfactory">here</a>
+can help in understanding TLS/SSL configurations listed below. This <a href="http://docs.oracle.com/javase/8/docs/technotes/guides/security/StandardNames.html">document</a> lists all the possible
+values for the below mentioned configs among others provided by Java implementation.</p>
+<table>
+<thead>
+<tr><th>Property</th><th>Description</th><th>Default</th><th>Required</th></tr>
+</thead>
+<tbody>
+<tr><td><code>druid.server.https.keyStorePath</code></td><td>The file path or URL of the TLS/SSL Key store.</td><td>none</td><td>yes</td></tr>
+<tr><td><code>druid.server.https.keyStoreType</code></td><td>The type of the key store.</td><td>none</td><td>yes</td></tr>
+<tr><td><code>druid.server.https.certAlias</code></td><td>Alias of TLS/SSL certificate for the connector.</td><td>none</td><td>yes</td></tr>
+<tr><td><code>druid.server.https.keyStorePassword</code></td><td>The <a href="/docs/0.20.0/operations/password-provider.html">Password Provider</a> or String password for the Key Store.</td><td>none</td><td>yes</td></tr>
+</tbody>
+</table>
+<p>Following table contains non-mandatory advanced configuration options, use caution.</p>
+<table>
+<thead>
+<tr><th>Property</th><th>Description</th><th>Default</th><th>Required</th></tr>
+</thead>
+<tbody>
+<tr><td><code>druid.server.https.keyManagerFactoryAlgorithm</code></td><td>Algorithm to use for creating KeyManager, more details <a href="https://docs.oracle.com/javase/7/docs/technotes/guides/security/jsse/JSSERefGuide.html#KeyManager">here</a>.</td><td><code>javax.net.ssl.KeyManagerFactory.getDefaultAlgorithm()</code></td><td>no</td></tr>
+<tr><td><code>druid.server.https.keyManagerPassword</code></td><td>The <a href="/docs/0.20.0/operations/password-provider.html">Password Provider</a> or String password for the Key Manager.</td><td>none</td><td>no</td></tr>
+<tr><td><code>druid.server.https.includeCipherSuites</code></td><td>List of cipher suite names to include. You can either use the exact cipher suite name or a regular expression.</td><td>Jetty's default include cipher list</td><td>no</td></tr>
+<tr><td><code>druid.server.https.excludeCipherSuites</code></td><td>List of cipher suite names to exclude. You can either use the exact cipher suite name or a regular expression.</td><td>Jetty's default exclude cipher list</td><td>no</td></tr>
+<tr><td><code>druid.server.https.includeProtocols</code></td><td>List of exact protocols names to include.</td><td>Jetty's default include protocol list</td><td>no</td></tr>
+<tr><td><code>druid.server.https.excludeProtocols</code></td><td>List of exact protocols names to exclude.</td><td>Jetty's default exclude protocol list</td><td>no</td></tr>
+</tbody>
+</table>
+<h4><a class="anchor" aria-hidden="true" id="internal-client-tls-configuration-requires-simple-client-sslcontext-extension"></a><a href="#internal-client-tls-configuration-requires-simple-client-sslcontext-extension" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Internal Client TLS Configuration (requires <code>simple-client-sslcontext</code> extension)</h4>
+<p>These properties apply to the SSLContext that will be provided to the internal HTTP client that Druid services use to communicate with each other. These properties require the <code>simple-client-sslcontext</code> extension to be loaded. Without it, Druid services will be unable to communicate with each other when TLS is enabled.</p>
+<table>
+<thead>
+<tr><th>Property</th><th>Description</th><th>Default</th><th>Required</th></tr>
+</thead>
+<tbody>
+<tr><td><code>druid.client.https.protocol</code></td><td>SSL protocol to use.</td><td><code>TLSv1.2</code></td><td>no</td></tr>
+<tr><td><code>druid.client.https.trustStoreType</code></td><td>The type of the key store where trusted root certificates are stored.</td><td><code>java.security.KeyStore.getDefaultType()</code></td><td>no</td></tr>
+<tr><td><code>druid.client.https.trustStorePath</code></td><td>The file path or URL of the TLS/SSL Key store where trusted root certificates are stored.</td><td>none</td><td>yes</td></tr>
+<tr><td><code>druid.client.https.trustStoreAlgorithm</code></td><td>Algorithm to be used by TrustManager to validate certificate chains</td><td><code>javax.net.ssl.TrustManagerFactory.getDefaultAlgorithm()</code></td><td>no</td></tr>
+<tr><td><code>druid.client.https.trustStorePassword</code></td><td>The <a href="/docs/0.20.0/operations/password-provider.html">Password Provider</a> or String password for the Trust Store.</td><td>none</td><td>yes</td></tr>
+</tbody>
+</table>
+<p>This <a href="http://docs.oracle.com/javase/8/docs/technotes/guides/security/StandardNames.html">document</a> lists all the possible
+values for the above mentioned configs among others provided by Java implementation.</p>
+<h3><a class="anchor" aria-hidden="true" id="authentication-and-authorization"></a><a href="#authentication-and-authorization" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Authentication and Authorization</h3>
+<table>
+<thead>
+<tr><th>Property</th><th>Type</th><th>Description</th><th>Default</th><th>Required</th></tr>
+</thead>
+<tbody>
+<tr><td><code>druid.auth.authenticatorChain</code></td><td>JSON List of Strings</td><td>List of Authenticator type names</td><td>[&quot;allowAll&quot;]</td><td>no</td></tr>
+<tr><td><code>druid.escalator.type</code></td><td>String</td><td>Type of the Escalator that should be used for internal Druid communications. This Escalator must use an authentication scheme that is supported by an Authenticator in <code>druid.auth.authenticatorChain</code>.</td><td>&quot;noop&quot;</td><td>no</td></tr>
+<tr><td><code>druid.auth.authorizers</code></td><td>JSON List of Strings</td><td>List of Authorizer type names</td><td>[&quot;allowAll&quot;]</td><td>no</td></tr>
+<tr><td><code>druid.auth.unsecuredPaths</code></td><td>List of Strings</td><td>List of paths for which security checks will not be performed. All requests to these paths will be allowed.</td><td>[]</td><td>no</td></tr>
+<tr><td><code>druid.auth.allowUnauthenticatedHttpOptions</code></td><td>Boolean</td><td>If true, skip authentication checks for HTTP OPTIONS requests. This is needed for certain use cases, such as supporting CORS pre-flight requests. Note that disabling authentication checks for OPTIONS requests will allow unauthenticated users to determine what Druid endpoints are valid (by checking if the OPTIONS request returns a 200 instead of 404), so enabling this option may reveal information about server configuration, including information about what extensions are loaded (if those extensions add endpoints).</td><td>false</td><td>no</td></tr>
+</tbody>
+</table>
+<p>For more information, please see <a href="/docs/0.20.0/design/auth.html">Authentication and Authorization</a>.</p>
+<p>For configuration options for specific auth extensions, please refer to the extension documentation.</p>
+<h3><a class="anchor" aria-hidden="true" id="startup-logging"></a><a href="#startup-logging" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Startup Logging</h3>
+<p>All processes can log debugging information on startup.</p>
+<table>
+<thead>
+<tr><th>Property</th><th>Description</th><th>Default</th></tr>
+</thead>
+<tbody>
+<tr><td><code>druid.startup.logging.logProperties</code></td><td>Log all properties on startup (from common.runtime.properties, runtime.properties, and the JVM command line).</td><td>false</td></tr>
+<tr><td><code>druid.startup.logging.maskProperties</code></td><td>Masks sensitive properties (passwords, for example) containing theses words.</td><td>[&quot;password&quot;]</td></tr>
+</tbody>
+</table>
+<p>Note that some sensitive information may be logged if these settings are enabled.</p>
+<h3><a class="anchor" aria-hidden="true" id="request-logging"></a><a href="#request-logging" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Request Logging</h3>
+<p>All processes that can serve queries can also log the query requests they see. Broker processes can additionally log the SQL requests (both from HTTP and JDBC) they see.</p>
+<table>
+<thead>
+<tr><th>Property</th><th>Description</th><th>Default</th></tr>
+</thead>
+<tbody>
+<tr><td><code>druid.request.logging.type</code></td><td>Choices: noop, file, emitter, slf4j, filtered, composing, switching. How to log every query request.</td><td>[required to configure request logging]</td></tr>
+</tbody>
+</table>
+<p>Note that, you can enable sending all the HTTP requests to log by setting  &quot;org.apache.druid.jetty.RequestLog&quot; to DEBUG level. See <a href="/docs/0.20.0/configuration/logging.html">Logging</a></p>
+<h4><a class="anchor" aria-hidden="true" id="file-request-logging"></a><a href="#file-request-logging" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>File Request Logging</h4>
+<p>Daily request logs are stored on disk.</p>
+<table>
+<thead>
+<tr><th>Property</th><th>Description</th><th>Default</th></tr>
+</thead>
+<tbody>
+<tr><td><code>druid.request.logging.dir</code></td><td>Historical, Realtime and Broker processes maintain request logs of all of the requests they get (interaction is via POST, so normal request logs don’t generally capture information about the actual query), this specifies the directory to store the request logs in</td><td>none</td></tr>
+<tr><td><code>druid.request.logging.filePattern</code></td><td><a href="http://www.joda.org/joda-time/apidocs/org/joda/time/format/DateTimeFormat.html">Joda datetime format</a> for each file</td><td>&quot;yyyy-MM-dd'.log'&quot;</td></tr>
+</tbody>
+</table>
+<p>The format of request logs is TSV, one line per requests, with five fields: timestamp, remote_addr, native_query, query_context, sql_query.</p>
+<p>For native JSON request, the <code>sql_query</code> field is empty. Example</p>
+<pre><code class="hljs"><span class="hljs-number">2019-01</span><span class="hljs-number">-14T10</span><span class="hljs-symbol">:</span>00<span class="hljs-symbol">:</span>00.000Z        <span class="hljs-number">127.0</span>.0.<span class="hljs-number">1</span>   {<span class="hljs-string">"queryType"</span><span class="hljs-symbol">:<span class="hljs-string">"topN"</span></span>,<span class="hljs-string">"dataSource"</span><span class="hljs-symbol">:</span>{<span class="hljs-string">"type"</span><span class="hljs-symbol">:<span class="hljs-string">"table"</span></span>,<span class="hljs-string">"name"</span><span class="hljs-symbol">:<span class="hljs-string">"wikiticker"</span></span>},<span class="hljs-string">"virtualColumns"</span><span class="hljs-symbol">:[]</span>,<span class="hljs-string">"dimension"</span><span class="hljs-symbol">:</span>{<span class="hljs-string">"type"</span><span class="hljs-symbol">:<span class="hljs-string">"LegacyDimensionSpec"</span></span>,<span class="hljs-string">"dimension"</span><span class="hljs-symbol">:<span class="hljs-string">"page"</span></span>,<span class="hljs-string">"outputName"</span><span class="hljs-symbol">:<span class="hljs-string">"page"</span></span>,<span class="hljs-string">"outputType"</span><span class="hljs-symbol">:<span class="hljs-string">"STRING"</span></span>},<span class="hljs-string">"metric"</span><span class="hljs-symbol">:</span>{<span class="hljs-string">"type"</span><span class="hljs-symbol">:<span class="hljs-string">"LegacyTopNMetricSpec"</span></span>,<span class="hljs-string">"metric"</span><span class="hljs-symbol">:<span class="hljs-string">"count"</span></span>},<span class="hljs-string">"threshold"</span><span class="hljs-symbol">:</span><span class="hljs-number">10</span>,<span class="hljs-string">"intervals"</span><span class="hljs-symbol">:</span>{<span class="hljs-string">"type"</span><span class="hljs-symbol">:<span class="hljs-string">"LegacySegmentSpec"</span></span>,<span class="hljs-string">"intervals"</span><span class="hljs-symbol">:</span>[<span class="hljs-string">"2015-09-12T00:00:00.000Z/2015-09-13T00:00:00.000Z"</span>]},<span class="hljs-string">"filter"</span><span class="hljs-symbol">:null</span>,<span class="hljs-string">"granularity"</span><span class="hljs-symbol">:</span>{<span class="hljs-string">"type"</span><span class="hljs-symbol">:<span class="hljs-string">"all"</span></span>},<span class="hljs-string">"aggregations"</span><span class="hljs-symbol">:</span>[{<span class="hljs-string">"type"</span><span class="hljs-symbol">:<span class="hljs-string">"count"</span></span>,<span class="hljs-string">"name"</span><span class="hljs-symbol">:<span class="hljs-string">"count"</span></span>}],<span class="hljs-string">"postAggregations"</span><span class="hljs-symbol">:[]</span>,<span class="hljs-string">"context"</span><span class="hljs-symbol">:</span>{<span class="hljs-string">"queryId"</span><span class="hljs-symbol">:<span class="hljs-string">"74c2d540-d700-4ebd-b4a9-3d02397976aa"</span></span>},<span class="hljs-string">"descending"</span><span class="hljs-symbol">:false</span>}    {<span class="hljs-string">"query/time"</span><span class="hljs-symbol">:</span><span class="hljs-number">100</span>,<span class="hljs-string">"query/bytes"</span><span class="hljs-symbol">:</span><span class="hljs-number">800</span>,<span class="hljs-string">"success"</span><span class="hljs-symbol">:true</span>,<span class="hljs-string">"identity"</span><span class="hljs-symbol">:<span class="hljs-string">"user1"</span></span>}
+</code></pre>
+<p>For SQL query request, the <code>native_query</code> field is empty. Example</p>
+<pre><code class="hljs"><span class="hljs-number">2019</span><span class="hljs-number">-01</span><span class="hljs-number">-14</span><span class="hljs-string">T10:</span><span class="hljs-number">00</span>:<span class="hljs-number">00.000</span>Z        <span class="hljs-number">127.0</span><span class="hljs-number">.0</span><span class="hljs-number">.1</span>       {<span class="hljs-string">"sqlQuery/time"</span>:<span class="hljs-number">100</span>,<span class="hljs-string">"sqlQuery/bytes"</span>:<span class="hljs-number">600</span>,<span class="hljs-string">"success"</span>:<span class="hljs-literal">true</span>,<span class="hljs-string">"identity"</span>:<span class="hljs-string">"user1"</span>}  {<span class="hljs-string">"query"</span>:<span class="hljs-string">"SELECT page, COUNT(*) AS Edits FROM wikiticker WHERE __time BETWEEN TIMESTAMP '2015-09-12 00:00:00' AND TIMESTAMP '2015-09-13 00:00:00' GROUP BY page ORDER BY Edits DESC LIMIT 10"</span>,<span class="hljs-string">"context"</span>:{<span class="hljs-string">"sqlQueryId"</span>:<span class="hljs-string">"c9d035a0-5ffd-4a79-a865-3ffdadbb5fdd"</span>,<span class="hljs-string">"nativeQueryIds"</span>:<span class="hljs-string">"[490978e4-f5c7-4cf6-b174-346e63cf8863]"</span>}}
+</code></pre>
+<h4><a class="anchor" aria-hidden="true" id="emitter-request-logging"></a><a href="#emitter-request-logging" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Emitter Request Logging</h4>
+<p>Every request is emitted to some external location.</p>
+<table>
+<thead>
+<tr><th>Property</th><th>Description</th><th>Default</th></tr>
+</thead>
+<tbody>
+<tr><td><code>druid.request.logging.feed</code></td><td>Feed name for requests.</td><td>none</td></tr>
+</tbody>
+</table>
+<h4><a class="anchor" aria-hidden="true" id="slf4j-request-logging"></a><a href="#slf4j-request-logging" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>SLF4J Request Logging</h4>
+<p>Every request is logged via SLF4J. Native queries are serialized into JSON in the log message regardless of the SLF4J format specification. They will be logged under the class <code>org.apache.druid.server.log.LoggingRequestLogger</code>.</p>
+<table>
+<thead>
+<tr><th>Property</th><th>Description</th><th>Default</th></tr>
+</thead>
+<tbody>
+<tr><td><code>druid.request.logging.setMDC</code></td><td>If MDC entries should be set in the log entry. Your logging setup still has to be configured to handle MDC to format this data</td><td>false</td></tr>
+<tr><td><code>druid.request.logging.setContextMDC</code></td><td>If the druid query <code>context</code> should be added to the MDC entries. Has no effect unless <code>setMDC</code> is <code>true</code></td><td>false</td></tr>
+</tbody>
+</table>
+<p>For native query, the following MDC fields are populated with <code>setMDC</code>:</p>
+<table>
+<thead>
+<tr><th>MDC field</th><th>Description</th></tr>
+</thead>
+<tbody>
+<tr><td><code>queryId</code></td><td>The query ID</td></tr>
+<tr><td><code>sqlQueryId</code></td><td>The SQL query ID if this query is part of a SQL request</td></tr>
+<tr><td><code>dataSource</code></td><td>The datasource the query was against</td></tr>
+<tr><td><code>queryType</code></td><td>The type of the query</td></tr>
+<tr><td><code>hasFilters</code></td><td>If the query has any filters</td></tr>
+<tr><td><code>remoteAddr</code></td><td>The remote address of the requesting client</td></tr>
+<tr><td><code>duration</code></td><td>The duration of the query interval</td></tr>
+<tr><td><code>resultOrdering</code></td><td>The ordering of results</td></tr>
+<tr><td><code>descending</code></td><td>If the query is a descending query</td></tr>
+</tbody>
+</table>
+<h4><a class="anchor" aria-hidden="true" id="filtered-request-logging"></a><a href="#filtered-request-logging" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Filtered Request Logging</h4>
+<p>Filtered Request Logger filters requests based on a configurable query/time threshold (for native query) and sqlQuery/time threshold (for SQL query).
+For native query, only request logs where query/time is above the threshold are emitted. For SQL query, only request logs where sqlQuery/time is above the threshold are emitted.</p>
+<table>
+<thead>
+<tr><th>Property</th><th>Description</th><th>Default</th></tr>
+</thead>
+<tbody>
+<tr><td><code>druid.request.logging.queryTimeThresholdMs</code></td><td>Threshold value for query/time in milliseconds.</td><td>0, i.e., no filtering</td></tr>
+<tr><td><code>druid.request.logging.sqlQueryTimeThresholdMs</code></td><td>Threshold value for sqlQuery/time in milliseconds.</td><td>0, i.e., no filtering</td></tr>
+<tr><td><code>druid.request.logging.mutedQueryTypes</code></td><td>Query requests of these types are not logged. Query types are defined as string objects corresponding to the &quot;queryType&quot; value for the specified query in the Druid's <a href="http://druid.apache.org/docs/latest/querying/querying.html">native JSON query API</a>. Misspelled query types will be ignored. Example to ignore scan and timeBoundary queries: [&quot;scan&quot;, &quot;timeBoundary&quot;]</td><td>[]</td></tr>
+<tr><td><code>druid.request.logging.delegate.type</code></td><td>Type of delegate request logger to log requests.</td><td>none</td></tr>
+</tbody>
+</table>
+<h4><a class="anchor" aria-hidden="true" id="composite-request-logging"></a><a href="#composite-request-logging" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Composite Request Logging</h4>
+<p>Composite Request Logger emits request logs to multiple request loggers.</p>
+<table>
+<thead>
+<tr><th>Property</th><th>Description</th><th>Default</th></tr>
+</thead>
+<tbody>
+<tr><td><code>druid.request.logging.loggerProviders</code></td><td>List of request loggers for emitting request logs.</td><td>none</td></tr>
+</tbody>
+</table>
+<h4><a class="anchor" aria-hidden="true" id="switching-request-logging"></a><a href="#switching-request-logging" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Switching Request Logging</h4>
+<p>Switching Request Logger routes native query's request logs to one request logger and SQL query's request logs to another request logger.</p>
+<table>
+<thead>
+<tr><th>Property</th><th>Description</th><th>Default</th></tr>
+</thead>
+<tbody>
+<tr><td><code>druid.request.logging.nativeQueryLogger</code></td><td>request logger for emitting native query's request logs.</td><td>none</td></tr>
+<tr><td><code>druid.request.logging.sqlQueryLogger</code></td><td>request logger for emitting SQL query's request logs.</td><td>none</td></tr>
+</tbody>
+</table>
+<h3><a class="anchor" aria-hidden="true" id="audit-logging"></a><a href="#audit-logging" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Audit Logging</h3>
+<p>Coordinator and Overlord log changes to lookups, segment load/drop rules, dynamic configuration changes for auditing</p>
+<table>
+<thead>
+<tr><th>Property</th><th>Description</th><th>Default</th></tr>
+</thead>
+<tbody>
+<tr><td><code>druid.audit.manager.auditHistoryMillis</code></td><td>Default duration for querying audit history.</td><td>1 week</td></tr>
+<tr><td><code>druid.audit.manager.includePayloadAsDimensionInMetric</code></td><td>Boolean flag on whether to add <code>payload</code> column in service metric.</td><td>false</td></tr>
+</tbody>
+</table>
+<h3><a class="anchor" aria-hidden="true" id="enabling-metrics"></a><a href="#enabling-metrics" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Enabling Metrics</h3>
+<p>Druid processes periodically emit metrics and different metrics monitors can be included. Each process can overwrite the default list of monitors.</p>
+<table>
+<thead>
+<tr><th>Property</th><th>Description</th><th>Default</th></tr>
+</thead>
+<tbody>
+<tr><td><code>druid.monitoring.emissionPeriod</code></td><td>How often metrics are emitted.</td><td>PT1M</td></tr>
+<tr><td><code>druid.monitoring.monitors</code></td><td>Sets list of Druid monitors used by a process. See below for names and more information. For example, you can specify monitors for a Broker with <code>druid.monitoring.monitors=[&quot;org.apache.druid.java.util.metrics.SysMonitor&quot;,&quot;org.apache.druid.java.util.metrics.JvmMonitor&quot;]</code>.</td><td>none (no monitors)</td></tr>
+</tbody>
+</table>
+<p>The following monitors are available:</p>
+<table>
+<thead>
+<tr><th>Name</th><th>Description</th></tr>
+</thead>
+<tbody>
+<tr><td><code>org.apache.druid.client.cache.CacheMonitor</code></td><td>Emits metrics (to logs) about the segment results cache for Historical and Broker processes. Reports typical cache statistics include hits, misses, rates, and size (bytes and number of entries), as well as timeouts and and errors.</td></tr>
+<tr><td><code>org.apache.druid.java.util.metrics.SysMonitor</code></td><td>This uses the <a href="https://github.com/hyperic/sigar">SIGAR library</a> to report on various system activities and statuses.</td></tr>
+<tr><td><code>org.apache.druid.server.metrics.HistoricalMetricsMonitor</code></td><td>Reports statistics on Historical processes.</td></tr>
+<tr><td><code>org.apache.druid.java.util.metrics.JvmMonitor</code></td><td>Reports various JVM-related statistics.</td></tr>
+<tr><td><code>org.apache.druid.java.util.metrics.JvmCpuMonitor</code></td><td>Reports statistics of CPU consumption by the JVM.</td></tr>
+<tr><td><code>org.apache.druid.java.util.metrics.CpuAcctDeltaMonitor</code></td><td>Reports consumed CPU as per the cpuacct cgroup.</td></tr>
+<tr><td><code>org.apache.druid.java.util.metrics.JvmThreadsMonitor</code></td><td>Reports Thread statistics in the JVM, like numbers of total, daemon, started, died threads.</td></tr>
+<tr><td><code>org.apache.druid.segment.realtime.RealtimeMetricsMonitor</code></td><td>Reports statistics on Realtime processes.</td></tr>
+<tr><td><code>org.apache.druid.server.metrics.EventReceiverFirehoseMonitor</code></td><td>Reports how many events have been queued in the EventReceiverFirehose.</td></tr>
+<tr><td><code>org.apache.druid.server.metrics.QueryCountStatsMonitor</code></td><td>Reports how many queries have been successful/failed/interrupted.</td></tr>
+<tr><td><code>org.apache.druid.server.emitter.HttpEmittingMonitor</code></td><td>Reports internal metrics of <code>http</code> or <code>parametrized</code> emitter (see below). Must not be used with another emitter type. See the description of the metrics here: <a href="https://github.com/apache/druid/pull/4973">https://github.com/apache/druid/pull/4973</a>.</td></tr>
+<tr><td><code>org.apache.druid.server.metrics.TaskCountStatsMonitor</code></td><td>Reports how many ingestion tasks are currently running/pending/waiting and also the number of successful/failed tasks per emission period.</td></tr>
+</tbody>
+</table>
+<h3><a class="anchor" aria-hidden="true" id="emitting-metrics"></a><a href="#emitting-metrics" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Emitting Metrics</h3>
+<p>The Druid servers <a href="/docs/0.20.0/operations/metrics.html">emit various metrics</a> and alerts via something we call an Emitter. There are three emitter implementations included with the code, a &quot;noop&quot; emitter (the default if none is specified), one that just logs to log4j (&quot;logging&quot;), and one that does POSTs of JSON events to a server (&quot;http&quot;). The properties for using the logging emitter are described below.</p>
+<table>
+<thead>
+<tr><th>Property</th><th>Description</th><th>Default</th></tr>
+</thead>
+<tbody>
+<tr><td><code>druid.emitter</code></td><td>Setting this value to &quot;noop&quot;, &quot;logging&quot;, &quot;http&quot; or &quot;parametrized&quot; will initialize one of the emitter modules. The value &quot;composing&quot; can be used to initialize multiple emitter modules.</td><td>noop</td></tr>
+</tbody>
+</table>
+<h4><a class="anchor" aria-hidden="true" id="logging-emitter-module"></a><a href="#logging-emitter-module" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Logging Emitter Module</h4>
+<table>
+<thead>
+<tr><th>Property</th><th>Description</th><th>Default</th></tr>
+</thead>
+<tbody>
+<tr><td><code>druid.emitter.logging.loggerClass</code></td><td>Choices: HttpPostEmitter, LoggingEmitter, NoopServiceEmitter, ServiceEmitter. The class used for logging.</td><td>LoggingEmitter</td></tr>
+<tr><td><code>druid.emitter.logging.logLevel</code></td><td>Choices: debug, info, warn, error. The log level at which message are logged.</td><td>info</td></tr>
+</tbody>
+</table>
+<h4><a class="anchor" aria-hidden="true" id="http-emitter-module"></a><a href="#http-emitter-module" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Http Emitter Module</h4>
+<table>
+<thead>
+<tr><th>Property</th><th>Description</th><th>Default</th></tr>
+</thead>
+<tbody>
+<tr><td><code>druid.emitter.http.flushMillis</code></td><td>How often the internal message buffer is flushed (data is sent).</td><td>60000</td></tr>
+<tr><td><code>druid.emitter.http.flushCount</code></td><td>How many messages the internal message buffer can hold before flushing (sending).</td><td>500</td></tr>
+<tr><td><code>druid.emitter.http.basicAuthentication</code></td><td><a href="/docs/0.20.0/operations/password-provider.html">Password Provider</a> for providing Login and password for authentication in &quot;login:password&quot; form, e.g., <code>druid.emitter.http.basicAuthentication=admin:adminpassword</code> uses Default Password Provider which allows plain text passwords.</td><td>not specified = no authentication</td></tr>
+<tr><td><code>druid.emitter.http.flushTimeOut</code></td><td>The timeout after which an event should be sent to the endpoint, even if internal buffers are not filled, in milliseconds.</td><td>not specified = no timeout</td></tr>
+<tr><td><code>druid.emitter.http.batchingStrategy</code></td><td>The strategy of how the batch is formatted. &quot;ARRAY&quot; means <code>[event1,event2]</code>, &quot;NEWLINES&quot; means <code>event1\nevent2</code>, ONLY_EVENTS means <code>event1event2</code>.</td><td>ARRAY</td></tr>
+<tr><td><code>druid.emitter.http.maxBatchSize</code></td><td>The maximum batch size, in bytes.</td><td>the minimum of (10% of JVM heap size divided by 2) or (5191680 (i. e. 5 MB))</td></tr>
+<tr><td><code>druid.emitter.http.batchQueueSizeLimit</code></td><td>The maximum number of batches in emitter queue, if there are problems with emitting.</td><td>the maximum of (2) or (10% of the JVM heap size divided by 5MB)</td></tr>
+<tr><td><code>druid.emitter.http.minHttpTimeoutMillis</code></td><td>If the speed of filling batches imposes timeout smaller than that, not even trying to send batch to endpoint, because it will likely fail, not being able to send the data that fast. Configure this depending based on emitter/successfulSending/minTimeMs metric. Reasonable values are 10ms..100ms.</td><td>0</td></tr>
+<tr><td><code>druid.emitter.http.recipientBaseUrl</code></td><td>The base URL to emit messages to. Druid will POST JSON to be consumed at the HTTP endpoint specified by this property.</td><td>none, required config</td></tr>
+</tbody>
+</table>
+<h4><a class="anchor" aria-hidden="true" id="http-emitter-module-tls-overrides"></a><a href="#http-emitter-module-tls-overrides" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Http Emitter Module TLS Overrides</h4>
+<p>When emitting events to a TLS-enabled receiver, the Http Emitter will by default use an SSLContext obtained via the
+process described at <a href="../operations/tls-support.html">Druid's internal communication over TLS</a>, i.e., the same
+SSLContext that would be used for internal communications between Druid processes.</p>
+<p>In some use cases it may be desirable to have the Http Emitter use its own separate truststore configuration. For example, there may be organizational policies that prevent the TLS-enabled metrics receiver's certificate from being added to the same truststore used by Druid's internal HTTP client.</p>
+<p>The following properties allow the Http Emitter to use its own truststore configuration when building its SSLContext.</p>
+<table>
+<thead>
+<tr><th>Property</th><th>Description</th><th>Default</th></tr>
+</thead>
+<tbody>
+<tr><td><code>druid.emitter.http.ssl.useDefaultJavaContext</code></td><td>If set to true, the HttpEmitter will use <code>SSLContext.getDefault()</code>, the default Java SSLContext, and all other properties below are ignored.</td><td>false</td></tr>
+<tr><td><code>druid.emitter.http.ssl.trustStorePath</code></td><td>The file path or URL of the TLS/SSL Key store where trusted root certificates are stored. If this is unspecified, the Http Emitter will use the same SSLContext as Druid's internal HTTP client, as described in the beginning of this section, and all other properties below are ignored.</td><td>null</td></tr>
+<tr><td><code>druid.emitter.http.ssl.trustStoreType</code></td><td>The type of the key store where trusted root certificates are stored.</td><td><code>java.security.KeyStore.getDefaultType()</code></td></tr>
+<tr><td><code>druid.emitter.http.ssl.trustStoreAlgorithm</code></td><td>Algorithm to be used by TrustManager to validate certificate chains</td><td><code>javax.net.ssl.TrustManagerFactory.getDefaultAlgorithm()</code></td></tr>
+<tr><td><code>druid.emitter.http.ssl.trustStorePassword</code></td><td>The <a href="/docs/0.20.0/operations/password-provider.html">Password Provider</a> or String password for the Trust Store.</td><td>none</td></tr>
+<tr><td><code>druid.emitter.http.ssl.protocol</code></td><td>TLS protocol to use.</td><td>&quot;TLSv1.2&quot;</td></tr>
+</tbody>
+</table>
+<h4><a class="anchor" aria-hidden="true" id="parametrized-http-emitter-module"></a><a href="#parametrized-http-emitter-module" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Parametrized Http Emitter Module</h4>
+<p><code>druid.emitter.parametrized.httpEmitting.*</code> configs correspond to the configs of Http Emitter Modules, see above.
+Except <code>recipientBaseUrl</code>. E.g., <code>druid.emitter.parametrized.httpEmitting.flushMillis</code>,
+<code>druid.emitter.parametrized.httpEmitting.flushCount</code>, <code>druid.emitter.parametrized.httpEmitting.ssl.trustStorePath</code>, etc.</p>
+<p>The additional configs are:</p>
+<table>
+<thead>
+<tr><th>Property</th><th>Description</th><th>Default</th></tr>
+</thead>
+<tbody>
+<tr><td><code>druid.emitter.parametrized.recipientBaseUrlPattern</code></td><td>The URL pattern to send an event to, based on the event's feed. E.g., <code>http://foo.bar/{feed}</code>, that will send event to <code>http://foo.bar/metrics</code> if the event's feed is &quot;metrics&quot;.</td><td>none, required config</td></tr>
+</tbody>
+</table>
+<h4><a class="anchor" aria-hidden="true" id="composing-emitter-module"></a><a href="#composing-emitter-module" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Composing Emitter Module</h4>
+<table>
+<thead>
+<tr><th>Property</th><th>Description</th><th>Default</th></tr>
+</thead>
+<tbody>
+<tr><td><code>druid.emitter.composing.emitters</code></td><td>List of emitter modules to load, e.g., [&quot;logging&quot;,&quot;http&quot;].</td><td>[]</td></tr>
+</tbody>
+</table>
+<h4><a class="anchor" aria-hidden="true" id="graphite-emitter"></a><a href="#graphite-emitter" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Graphite Emitter</h4>
+<p>To use graphite as emitter set <code>druid.emitter=graphite</code>. For configuration details please follow this <a href="/docs/0.20.0/development/extensions-contrib/graphite.html">link</a>.</p>
+<h3><a class="anchor" aria-hidden="true" id="metadata-storage"></a><a href="#metadata-storage" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Metadata storage</h3>
+<p>These properties specify the JDBC connection and other configuration around the metadata storage. The only processes that connect to the metadata storage with these properties are the <a href="/docs/0.20.0/design/coordinator.html">Coordinator</a> and <a href="/docs/0.20.0/design/overlord.html">Overlord</a>.</p>
+<table>
+<thead>
+<tr><th>Property</th><th>Description</th><th>Default</th></tr>
+</thead>
+<tbody>
+<tr><td><code>druid.metadata.storage.type</code></td><td>The type of metadata storage to use. Choose from &quot;mysql&quot;, &quot;postgresql&quot;, or &quot;derby&quot;.</td><td>derby</td></tr>
+<tr><td><code>druid.metadata.storage.connector.connectURI</code></td><td>The JDBC URI for the database to connect to</td><td>none</td></tr>
+<tr><td><code>druid.metadata.storage.connector.user</code></td><td>The username to connect with.</td><td>none</td></tr>
+<tr><td><code>druid.metadata.storage.connector.password</code></td><td>The <a href="/docs/0.20.0/operations/password-provider.html">Password Provider</a> or String password used to connect with.</td><td>none</td></tr>
+<tr><td><code>druid.metadata.storage.connector.createTables</code></td><td>If Druid requires a table and it doesn't exist, create it?</td><td>true</td></tr>
+<tr><td><code>druid.metadata.storage.tables.base</code></td><td>The base name for tables.</td><td>druid</td></tr>
+<tr><td><code>druid.metadata.storage.tables.dataSource</code></td><td>The table to use to look for dataSources which created by <a href="/docs/0.20.0/development/extensions-core/kafka-ingestion.html">Kafka Indexing Service</a>.</td><td>druid_dataSource</td></tr>
+<tr><td><code>druid.metadata.storage.tables.pendingSegments</code></td><td>The table to use to look for pending segments.</td><td>druid_pendingSegments</td></tr>
+<tr><td><code>druid.metadata.storage.tables.segments</code></td><td>The table to use to look for segments.</td><td>druid_segments</td></tr>
+<tr><td><code>druid.metadata.storage.tables.rules</code></td><td>The table to use to look for segment load/drop rules.</td><td>druid_rules</td></tr>
+<tr><td><code>druid.metadata.storage.tables.config</code></td><td>The table to use to look for configs.</td><td>druid_config</td></tr>
+<tr><td><code>druid.metadata.storage.tables.tasks</code></td><td>Used by the indexing service to store tasks.</td><td>druid_tasks</td></tr>
+<tr><td><code>druid.metadata.storage.tables.taskLog</code></td><td>Used by the indexing service to store task logs.</td><td>druid_taskLog</td></tr>
+<tr><td><code>druid.metadata.storage.tables.taskLock</code></td><td>Used by the indexing service to store task locks.</td><td>druid_taskLock</td></tr>
+<tr><td><code>druid.metadata.storage.tables.supervisors</code></td><td>Used by the indexing service to store supervisor configurations.</td><td>druid_supervisors</td></tr>
+<tr><td><code>druid.metadata.storage.tables.audit</code></td><td>The table to use for audit history of configuration changes, e.g., Coordinator rules.</td><td>druid_audit</td></tr>
+</tbody>
+</table>
+<h3><a class="anchor" aria-hidden="true" id="deep-storage"></a><a href="#deep-storage" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Deep storage</h3>
+<p>The configurations concern how to push and pull <a href="/docs/0.20.0/design/segments.html">Segments</a> from deep storage.</p>
+<table>
+<thead>
+<tr><th>Property</th><th>Description</th><th>Default</th></tr>
+</thead>
+<tbody>
+<tr><td><code>druid.storage.type</code></td><td>Choices:local, noop, s3, hdfs, c*. The type of deep storage to use.</td><td>local</td></tr>
+</tbody>
+</table>
+<h4><a class="anchor" aria-hidden="true" id="local-deep-storage"></a><a href="#local-deep-storage" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Local Deep Storage</h4>
+<p>Local deep storage uses the local filesystem.</p>
+<table>
+<thead>
+<tr><th>Property</th><th>Description</th><th>Default</th></tr>
+</thead>
+<tbody>
+<tr><td><code>druid.storage.storageDirectory</code></td><td>Directory on disk to use as deep storage.</td><td>/tmp/druid/localStorage</td></tr>
+</tbody>
+</table>
+<h4><a class="anchor" aria-hidden="true" id="noop-deep-storage"></a><a href="#noop-deep-storage" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Noop Deep Storage</h4>
+<p>This deep storage doesn't do anything. There are no configs.</p>
+<h4><a class="anchor" aria-hidden="true" id="s3-deep-storage"></a><a href="#s3-deep-storage" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>S3 Deep Storage</h4>
+<p>This deep storage is used to interface with Amazon's S3. Note that the <code>druid-s3-extensions</code> extension must be loaded.
+The below table shows some important configurations for S3. See <a href="/docs/0.20.0/development/extensions-core/s3.html">S3 Deep Storage</a> for full configurations.</p>
+<table>
+<thead>
+<tr><th>Property</th><th>Description</th><th>Default</th></tr>
+</thead>
+<tbody>
+<tr><td><code>druid.storage.bucket</code></td><td>S3 bucket name.</td><td>none</td></tr>
+<tr><td><code>druid.storage.baseKey</code></td><td>S3 object key prefix for storage.</td><td>none</td></tr>
+<tr><td><code>druid.storage.disableAcl</code></td><td>Boolean flag for ACL. If this is set to <code>false</code>, the full control would be granted to the bucket owner. This may require to set additional permissions. See <a href="../development/extensions-core/s3.html#s3-permissions-settings">S3 permissions settings</a>.</td><td>false</td></tr>
+<tr><td><code>druid.storage.archiveBucket</code></td><td>S3 bucket name for archiving when running the <em>archive task</em>.</td><td>none</td></tr>
+<tr><td><code>druid.storage.archiveBaseKey</code></td><td>S3 object key prefix for archiving.</td><td>none</td></tr>
+<tr><td><code>druid.storage.sse.type</code></td><td>Server-side encryption type. Should be one of <code>s3</code>, <code>kms</code>, and <code>custom</code>. See the below <a href="../development/extensions-core/s3.html#server-side-encryption">Server-side encryption section</a> for more details.</td><td>None</td></tr>
+<tr><td><code>druid.storage.sse.kms.keyId</code></td><td>AWS KMS key ID. This is used only when <code>druid.storage.sse.type</code> is <code>kms</code> and can be empty to use the default key ID.</td><td>None</td></tr>
+<tr><td><code>druid.storage.sse.custom.base64EncodedKey</code></td><td>Base64-encoded key. Should be specified if <code>druid.storage.sse.type</code> is <code>custom</code>.</td><td>None</td></tr>
+<tr><td><code>druid.storage.useS3aSchema</code></td><td>If true, use the &quot;s3a&quot; filesystem when using Hadoop-based ingestion. If false, the &quot;s3n&quot; filesystem will be used. Only affects Hadoop-based ingestion.</td><td>false</td></tr>
+</tbody>
+</table>
+<h4><a class="anchor" aria-hidden="true" id="hdfs-deep-storage"></a><a href="#hdfs-deep-storage" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>HDFS Deep Storage</h4>
+<p>This deep storage is used to interface with HDFS.  Note that the <code>druid-hdfs-storage</code> extension must be loaded.</p>
+<table>
+<thead>
+<tr><th>Property</th><th>Description</th><th>Default</th></tr>
+</thead>
+<tbody>
+<tr><td><code>druid.storage.storageDirectory</code></td><td>HDFS directory to use as deep storage.</td><td>none</td></tr>
+</tbody>
+</table>
+<h4><a class="anchor" aria-hidden="true" id="cassandra-deep-storage"></a><a href="#cassandra-deep-storage" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Cassandra Deep Storage</h4>
+<p>This deep storage is used to interface with Cassandra.  Note that the <code>druid-cassandra-storage</code> extension must be loaded.</p>
+<table>
+<thead>
+<tr><th>Property</th><th>Description</th><th>Default</th></tr>
+</thead>
+<tbody>
+<tr><td><code>druid.storage.host</code></td><td>Cassandra host.</td><td>none</td></tr>
+<tr><td><code>druid.storage.keyspace</code></td><td>Cassandra key space.</td><td>none</td></tr>
+</tbody>
+</table>
+<h3><a class="anchor" aria-hidden="true" id="task-logging"></a><a href="#task-logging" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Task Logging</h3>
+<p>If you are running the indexing service in remote mode, the task logs must be stored in S3, Azure Blob Store, Google Cloud Storage or HDFS.</p>
+<table>
+<thead>
+<tr><th>Property</th><th>Description</th><th>Default</th></tr>
+</thead>
+<tbody>
+<tr><td><code>druid.indexer.logs.type</code></td><td>Choices:noop, s3, azure, google, hdfs, file. Where to store task logs</td><td>file</td></tr>
+</tbody>
+</table>
+<p>You can also configure the Overlord to automatically retain the task logs in log directory and entries in task-related metadata storage tables only for last x milliseconds by configuring following additional properties.
+Caution: Automatic log file deletion typically works based on log file modification timestamp on the backing store, so large clock skews between druid processes and backing store nodes might result in unintended behavior.</p>
+<table>
+<thead>
+<tr><th>Property</th><th>Description</th><th>Default</th></tr>
+</thead>
+<tbody>
+<tr><td><code>druid.indexer.logs.kill.enabled</code></td><td>Boolean value for whether to enable deletion of old task logs. If set to true, Overlord will submit kill tasks periodically based on <code>druid.indexer.logs.kill.delay</code> specified, which will delete task logs from the log directory as well as tasks and tasklogs table entries in metadata storage except for tasks created in the last <code>druid.indexer.logs.kill.durationToRetain</code> period.</td><td>false</td></tr>
+<tr><td><code>druid.indexer.logs.kill.durationToRetain</code></td><td>Required if kill is enabled. In milliseconds, task logs and entries in task-related metadata storage tables to be retained created in last x milliseconds.</td><td>None</td></tr>
+<tr><td><code>druid.indexer.logs.kill.initialDelay</code></td><td>Optional. Number of milliseconds after Overlord start when first auto kill is run.</td><td>random value less than 300000 (5 mins)</td></tr>
+<tr><td><code>druid.indexer.logs.kill.delay</code></td><td>Optional. Number of milliseconds of delay between successive executions of auto kill run.</td><td>21600000 (6 hours)</td></tr>
+</tbody>
+</table>
+<h4><a class="anchor" aria-hidden="true" id="file-task-logs"></a><a href="#file-task-logs" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>File Task Logs</h4>
+<p>Store task logs in the local filesystem.</p>
+<table>
+<thead>
+<tr><th>Property</th><th>Description</th><th>Default</th></tr>
+</thead>
+<tbody>
+<tr><td><code>druid.indexer.logs.directory</code></td><td>Local filesystem path.</td><td>log</td></tr>
+</tbody>
+</table>
+<h4><a class="anchor" aria-hidden="true" id="s3-task-logs"></a><a href="#s3-task-logs" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>S3 Task Logs</h4>
+<p>Store task logs in S3. Note that the <code>druid-s3-extensions</code> extension must be loaded.</p>
+<table>
+<thead>
+<tr><th>Property</th><th>Description</th><th>Default</th></tr>
+</thead>
+<tbody>
+<tr><td><code>druid.indexer.logs.s3Bucket</code></td><td>S3 bucket name.</td><td>none</td></tr>
+<tr><td><code>druid.indexer.logs.s3Prefix</code></td><td>S3 key prefix.</td><td>none</td></tr>
+<tr><td><code>druid.indexer.logs.disableAcl</code></td><td>Boolean flag for ACL. If this is set to <code>false</code>, the full control would be granted to the bucket owner. If the task logs bucket is the same as the deep storage (S3) bucket, then the value of this property will need to be set to true if druid.storage.disableAcl has been set to true.</td><td>false</td></tr>
+</tbody>
+</table>
+<h4><a class="anchor" aria-hidden="true" id="azure-blob-store-task-logs"></a><a href="#azure-blob-store-task-logs" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Azure Blob Store Task Logs</h4>
+<p>Store task logs in Azure Blob Store.</p>
+<p>Note: The <code>druid-azure-extensions</code> extension must be loaded, and this uses the same storage account as the deep storage module for azure.</p>
+<table>
+<thead>
+<tr><th>Property</th><th>Description</th><th>Default</th></tr>
+</thead>
+<tbody>
+<tr><td><code>druid.indexer.logs.container</code></td><td>The Azure Blob Store container to write logs to</td><td>none</td></tr>
+<tr><td><code>druid.indexer.logs.prefix</code></td><td>The path to prepend to logs</td><td>none</td></tr>
+</tbody>
+</table>
+<h4><a class="anchor" aria-hidden="true" id="google-cloud-storage-task-logs"></a><a href="#google-cloud-storage-task-logs" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Google Cloud Storage Task Logs</h4>
+<p>Store task logs in Google Cloud Storage.</p>
+<p>Note: The <code>druid-google-extensions</code> extension must be loaded, and this uses the same storage settings as the deep storage module for google.</p>
+<table>
+<thead>
+<tr><th>Property</th><th>Description</th><th>Default</th></tr>
+</thead>
+<tbody>
+<tr><td><code>druid.indexer.logs.bucket</code></td><td>The Google Cloud Storage bucket to write logs to</td><td>none</td></tr>
+<tr><td><code>druid.indexer.logs.prefix</code></td><td>The path to prepend to logs</td><td>none</td></tr>
+</tbody>
+</table>
+<h4><a class="anchor" aria-hidden="true" id="hdfs-task-logs"></a><a href="#hdfs-task-logs" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>HDFS Task Logs</h4>
+<p>Store task logs in HDFS. Note that the <code>druid-hdfs-storage</code> extension must be loaded.</p>
+<table>
+<thead>
+<tr><th>Property</th><th>Description</th><th>Default</th></tr>
+</thead>
+<tbody>
+<tr><td><code>druid.indexer.logs.directory</code></td><td>The directory to store logs.</td><td>none</td></tr>
+</tbody>
+</table>
+<h3><a class="anchor" aria-hidden="true" id="overlord-discovery"></a><a href="#overlord-discovery" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Overlord Discovery</h3>
+<p>This config is used to find the <a href="/docs/0.20.0/design/overlord.html">Overlord</a> using Curator service discovery. Only required if you are actually running an Overlord.</p>
+<table>
+<thead>
+<tr><th>Property</th><th>Description</th><th>Default</th></tr>
+</thead>
+<tbody>
+<tr><td><code>druid.selectors.indexing.serviceName</code></td><td>The druid.service name of the Overlord process. To start the Overlord with a different name, set it with this property.</td><td>druid/overlord</td></tr>
+</tbody>
+</table>
+<h3><a class="anchor" aria-hidden="true" id="coordinator-discovery"></a><a href="#coordinator-discovery" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Coordinator Discovery</h3>
+<p>This config is used to find the <a href="/docs/0.20.0/design/coordinator.html">Coordinator</a> using Curator service discovery. This config is used by the realtime indexing processes to get information about the segments loaded in the cluster.</p>
+<table>
+<thead>
+<tr><th>Property</th><th>Description</th><th>Default</th></tr>
+</thead>
+<tbody>
+<tr><td><code>druid.selectors.coordinator.serviceName</code></td><td>The druid.service name of the Coordinator process. To start the Coordinator with a different name, set it with this property.</td><td>druid/coordinator</td></tr>
+</tbody>
+</table>
+<h3><a class="anchor" aria-hidden="true" id="announcing-segments"></a><a href="#announcing-segments" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Announcing Segments</h3>
+<p>You can configure how to announce and unannounce Znodes in ZooKeeper (using Curator). For normal operations you do not need to override any of these configs.</p>
+<h5><a class="anchor" aria-hidden="true" id="batch-data-segment-announcer"></a><a href="#batch-data-segment-announcer" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Batch Data Segment Announcer</h5>
+<p>In current Druid, multiple data segments may be announced under the same Znode.</p>
+<table>
+<thead>
+<tr><th>Property</th><th>Description</th><th>Default</th></tr>
+</thead>
+<tbody>
+<tr><td><code>druid.announcer.segmentsPerNode</code></td><td>Each Znode contains info for up to this many segments.</td><td>50</td></tr>
+<tr><td><code>druid.announcer.maxBytesPerNode</code></td><td>Max byte size for Znode.</td><td>524288</td></tr>
+<tr><td><code>druid.announcer.skipDimensionsAndMetrics</code></td><td>Skip Dimensions and Metrics list from segment announcements. NOTE: Enabling this will also remove the dimensions and metrics list from Coordinator and Broker endpoints.</td><td>false</td></tr>
+<tr><td><code>druid.announcer.skipLoadSpec</code></td><td>Skip segment LoadSpec from segment announcements. NOTE: Enabling this will also remove the loadspec from Coordinator and Broker endpoints.</td><td>false</td></tr>
+</tbody>
+</table>
+<h3><a class="anchor" aria-hidden="true" id="javascript"></a><a href="#javascript" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>JavaScript</h3>
+<p>Druid supports dynamic runtime extension through JavaScript functions. This functionality can be configured through
+the following properties.</p>
+<table>
+<thead>
+<tr><th>Property</th><th>Description</th><th>Default</th></tr>
+</thead>
+<tbody>
+<tr><td><code>druid.javascript.enabled</code></td><td>Set to &quot;true&quot; to enable JavaScript functionality. This affects the JavaScript parser, filter, extractionFn, aggregator, post-aggregator, router strategy, and worker selection strategy.</td><td>false</td></tr>
+</tbody>
+</table>
+<blockquote>
+<p>JavaScript-based functionality is disabled by default. Please refer to the Druid <a href="/docs/0.20.0/development/javascript.html">JavaScript programming guide</a> for guidelines about using Druid's JavaScript functionality, including instructions on how to enable it.</p>
+</blockquote>
+<h3><a class="anchor" aria-hidden="true" id="double-column-storage"></a><a href="#double-column-storage" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Double Column storage</h3>
+<p>Prior to version 0.13.0, Druid's storage layer used a 32-bit float representation to store columns created by the
+doubleSum, doubleMin, and doubleMax aggregators at indexing time.
+Starting from version 0.13.0 the default will be 64-bit floats for Double columns.
+Using 64-bit representation for double column will lead to avoid precision loss at the cost of doubling the storage size of such columns.
+To keep the old format set the system-wide property <code>druid.indexing.doubleStorage=float</code>.
+You can also use floatSum, floatMin and floatMax to use 32-bit float representation.
+Support for 64-bit floating point columns was released in Druid 0.11.0, so if you use this feature then older versions of Druid will not be able to read your data segments.</p>
+<table>
+<thead>
+<tr><th>Property</th><th>Description</th><th>Default</th></tr>
+</thead>
+<tbody>
+<tr><td><code>druid.indexing.doubleStorage</code></td><td>Set to &quot;float&quot; to use 32-bit double representation for double columns.</td><td>double</td></tr>
+</tbody>
+</table>
+<h3><a class="anchor" aria-hidden="true" id="sql-compatible-null-handling"></a><a href="#sql-compatible-null-handling" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>SQL compatible null handling</h3>
+<p>Prior to version 0.13.0, Druid string columns treated <code>''</code> and <code>null</code> values as interchangeable, and numeric columns were unable to represent <code>null</code> values, coercing <code>null</code> to <code>0</code>. Druid 0.13.0 introduced a mode which enabled SQL compatible null handling, allowing string columns to distinguish empty strings from nulls, and numeric columns to contain null rows.</p>
+<table>
+<thead>
+<tr><th>Property</th><th>Description</th><th>Default</th></tr>
+</thead>
+<tbody>
+<tr><td><code>druid.generic.useDefaultValueForNull</code></td><td>When set to <code>true</code>, <code>null</code> values will be stored as <code>''</code> for string columns and <code>0</code> for numeric columns. Set to <code>false</code> to store and query data in SQL compatible mode.</td><td><code>true</code></td></tr>
+</tbody>
+</table>
+<p>This mode does have a storage size and query performance cost, see <a href="/docs/0.20.0/design/segments.html#sql-compatible-null-handling">segment documentation</a> for more details.</p>
+<h3><a class="anchor" aria-hidden="true" id="http-client"></a><a href="#http-client" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>HTTP Client</h3>
+<p>All Druid components can communicate with each other over HTTP.</p>
+<table>
+<thead>
+<tr><th>Property</th><th>Description</th><th>Default</th></tr>
+</thead>
+<tbody>
+<tr><td><code>druid.global.http.numConnections</code></td><td>Size of connection pool per destination URL. If there are more HTTP requests than this number that all need to speak to the same URL, then they will queue up.</td><td><code>20</code></td></tr>
+<tr><td><code>druid.global.http.compressionCodec</code></td><td>Compression codec to communicate with others. May be &quot;gzip&quot; or &quot;identity&quot;.</td><td><code>gzip</code></td></tr>
+<tr><td><code>druid.global.http.readTimeout</code></td><td>The timeout for data reads.</td><td><code>PT15M</code></td></tr>
+<tr><td><code>druid.global.http.unusedConnectionTimeout</code></td><td>The timeout for idle connections in connection pool. The connection in the pool will be closed after this timeout and a new one will be established. This timeout should be less than <code>druid.global.http.readTimeout</code>. Set this timeout = ~90% of <code>druid.global.http.readTimeout</code></td><td><code>PT4M</code></td></tr>
+<tr><td><code>druid.global.http.numMaxThreads</code></td><td>Maximum number of I/O worker threads</td><td><code>max(10, ((number of cores * 17) / 16 + 2) + 30)</code></td></tr>
+</tbody>
+</table>
+<h2><a class="anchor" aria-hidden="true" id="master-server"></a><a href="#master-server" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Master Server</h2>
+<p>This section contains the configuration options for the processes that reside on Master servers (Coordinators and Overlords) in the suggested <a href="../design/processes.html#server-types">three-server configuration</a>.</p>
+<h3><a class="anchor" aria-hidden="true" id="coordinator"></a><a href="#coordinator" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Coordinator</h3>
+<p>For general Coordinator Process information, see <a href="/docs/0.20.0/design/coordinator.html">here</a>.</p>
+<h4><a class="anchor" aria-hidden="true" id="static-configuration"></a><a href="#static-configuration" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Static Configuration</h4>
+<p>These Coordinator static configurations can be defined in the <code>coordinator/runtime.properties</code> file.</p>
+<h5><a class="anchor" aria-hidden="true" id="coordinator-process-config"></a><a href="#coordinator-process-config" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Coordinator Process Config</h5>
+<table>
+<thead>
+<tr><th>Property</th><th>Description</th><th>Default</th></tr>
+</thead>
+<tbody>
+<tr><td><code>druid.host</code></td><td>The host for the current process. This is used to advertise the current processes location as reachable from another process and should generally be specified such that <code>http://${druid.host}/</code> could actually talk to this process</td><td>InetAddress.getLocalHost().getCanonicalHostName()</td></tr>
+<tr><td><code>druid.bindOnHost</code></td><td>Indicating whether the process's internal jetty server bind on <code>druid.host</code>. Default is false, which means binding to all interfaces.</td><td>false</td></tr>
+<tr><td><code>druid.plaintextPort</code></td><td>This is the port to actually listen on; unless port mapping is used, this will be the same port as is on <code>druid.host</code></td><td>8081</td></tr>
+<tr><td><code>druid.tlsPort</code></td><td>TLS port for HTTPS connector, if <a href="/docs/0.20.0/operations/tls-support.html">druid.enableTlsPort</a> is set then this config will be used. If <code>druid.host</code> contains port then that port will be ignored. This should be a non-negative Integer.</td><td>8281</td></tr>
+<tr><td><code>druid.service</code></td><td>The name of the service. This is used as a dimension when emitting metrics and alerts to differentiate between the various services</td><td>druid/coordinator</td></tr>
+</tbody>
+</table>
+<h5><a class="anchor" aria-hidden="true" id="coordinator-operation"></a><a href="#coordinator-operation" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Coordinator Operation</h5>
+<table>
+<thead>
+<tr><th>Property</th><th>Description</th><th>Default</th></tr>
+</thead>
+<tbody>
+<tr><td><code>druid.coordinator.period</code></td><td>The run period for the Coordinator. The Coordinator operates by maintaining the current state of the world in memory and periodically looking at the set of &quot;used&quot; segments and segments being served to make decisions about whether any changes need to be made to the data topology. This property sets the delay between each of these runs.</td><td>PT60S</td></tr>
+<tr><td><code>druid.coordinator.period.indexingPeriod</code></td><td>How often to send compact/merge/conversion tasks to the indexing service. It's recommended to be longer than <code>druid.manager.segments.pollDuration</code></td><td>PT1800S (30 mins)</td></tr>
+<tr><td><code>druid.coordinator.startDelay</code></td><td>The operation of the Coordinator works on the assumption that it has an up-to-date view of the state of the world when it runs, the current ZK interaction code, however, is written in a way that doesn’t allow the Coordinator to know for a fact that it’s done loading the current state of the world. This delay is a hack to give it enough time to believe that it has all the data.</td><td>PT300S</td></tr>
+<tr><td><code>druid.coordinator.load.timeout</code></td><td>The timeout duration for when the Coordinator assigns a segment to a Historical process.</td><td>PT15M</td></tr>
+<tr><td><code>druid.coordinator.kill.pendingSegments.on</code></td><td>Boolean flag for whether or not the Coordinator clean up old entries in the <code>pendingSegments</code> table of metadata store. If set to true, Coordinator will check the created time of most recently complete task. If it doesn't exist, it finds the created time of the earliest running/pending/waiting tasks. Once the created time is found, then for all dataSources not in the <code>killPendingSegmentsSkipList</code> (see <a href="#dynamic-configuration">Dynamic configuration</a>), Coordinator will ask the Overlord to clean up the entries 1 day or more older than the found created time in the <code>pendingSegments</code> table. This will be done periodically based on <code>druid.coordinator.period</code> specified.</td><td>true</td></tr>
+<tr><td><code>druid.coordinator.kill.on</code></td><td>Boolean flag for whether or not the Coordinator should submit kill task for unused segments, that is, hard delete them from metadata store and deep storage. If set to true, then for all whitelisted dataSources (or optionally all), Coordinator will submit tasks periodically based on <code>period</code> specified. These kill tasks will delete all unused segments except for the last <code>durationToRetain</code> period. Whitelist or All can be set via dynamic configuration <code>killAllDataSources</code> and <code>killDataSourceWhitelist</code> described later.</td><td>false</td></tr>
+<tr><td><code>druid.coordinator.kill.period</code></td><td>How often to send kill tasks to the indexing service. Value must be greater than <code>druid.coordinator.period.indexingPeriod</code>. Only applies if kill is turned on.</td><td>P1D (1 Day)</td></tr>
+<tr><td><code>druid.coordinator.kill.durationToRetain</code></td><td>Do not kill unused segments in last <code>durationToRetain</code>, must be greater or equal to 0. Only applies and MUST be specified if kill is turned on. Note that default value is invalid.</td><td>PT-1S (-1 seconds)</td></tr>
+<tr><td><code>druid.coordinator.kill.maxSegments</code></td><td>Kill at most n unused segments per kill task submission, must be greater than 0. Only applies and MUST be specified if kill is turned on. Note that default value is invalid.</td><td>0</td></tr>
+<tr><td><code>druid.coordinator.balancer.strategy</code></td><td>Specify the type of balancing strategy that the coordinator should use to distribute segments among the historicals. <code>cachingCost</code> is logically equivalent to <code>cost</code> but is more CPU-efficient on large clusters and will replace <code>cost</code> in the future versions, users are invited to try it. Use <code>diskNormalized</code> to distribute segments among processes so that the disks fill up uniformly and use <code>random</code> to randomly pick processes to distribute segments.</td><td><code>cost</code></td></tr>
+<tr><td><code>druid.coordinator.balancer.cachingCost.awaitInitialization</code></td><td>Whether to wait for segment view initialization before creating the <code>cachingCost</code> balancing strategy. This property is enabled only when <code>druid.coordinator.balancer.strategy</code> is <code>cachingCost</code>. If set to 'true', the Coordinator will not start to assign segments, until the segment view is initialized. If set to 'false', the Coordinator will fallback to use the <code>cost</code> balancing strategy only if the segment view is not initialized yet. Notes, it may take much time to wait for the initialization since the <code>cachingCost</code> balancing strategy involves much computing to build itself.</td><td>false</td></tr>
+<tr><td><code>druid.coordinator.loadqueuepeon.repeatDelay</code></td><td>The start and repeat delay for the loadqueuepeon, which manages the load and drop of segments.</td><td>PT0.050S (50 ms)</td></tr>
+<tr><td><code>druid.coordinator.asOverlord.enabled</code></td><td>Boolean value for whether this Coordinator process should act like an Overlord as well. This configuration allows users to simplify a druid cluster by not having to deploy any standalone Overlord processes. If set to true, then Overlord console is available at <code>http://coordinator-host:port/console.html</code> and be sure to set <code>druid.coordinator.asOverlord.overlordService</code> also. See next.</td><td>false</td></tr>
+<tr><td><code>druid.coordinator.asOverlord.overlordService</code></td><td>Required, if <code>druid.coordinator.asOverlord.enabled</code> is <code>true</code>. This must be same value as <code>druid.service</code> on standalone Overlord processes and <code>druid.selectors.indexing.serviceName</code> on Middle Managers.</td><td>NULL</td></tr>
+</tbody>
+</table>
+<h5><a class="anchor" aria-hidden="true" id="segment-management"></a><a href="#segment-management" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Segment Management</h5>
+<table>
+<thead>
+<tr><th>Property</th><th>Possible Values</th><th>Description</th><th>Default</th></tr>
+</thead>
+<tbody>
+<tr><td><code>druid.serverview.type</code></td><td>batch or http</td><td>Segment discovery method to use. &quot;http&quot; enables discovering segments using HTTP instead of zookeeper.</td><td>batch</td></tr>
+<tr><td><code>druid.coordinator.loadqueuepeon.type</code></td><td>curator or http</td><td>Whether to use &quot;http&quot; or &quot;curator&quot; implementation to assign segment loads/drops to historical</td><td>curator</td></tr>
+<tr><td><code>druid.coordinator.segment.awaitInitializationOnStart</code></td><td>true or false</td><td>Whether the Coordinator will wait for its view of segments to fully initialize before starting up. If set to 'true', the Coordinator's HTTP server will not start up, and the Coordinator will not announce itself as available, until the server view is initialized.</td><td>true</td></tr>
+</tbody>
+</table>
+<h6><a class="anchor" aria-hidden="true" id="additional-config-when-http-loadqueuepeon-is-used"></a><a href="#additional-config-when-http-loadqueuepeon-is-used" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Additional config when &quot;http&quot; loadqueuepeon is used</h6>
+<table>
+<thead>
+<tr><th>Property</th><th>Description</th><th>Default</th></tr>
+</thead>
+<tbody>
+<tr><td><code>druid.coordinator.loadqueuepeon.http.batchSize</code></td><td>Number of segment load/drop requests to batch in one HTTP request. Note that it must be smaller than <code>druid.segmentCache.numLoadingThreads</code> config on Historical process.</td><td>1</td></tr>
+</tbody>
+</table>
+<h5><a class="anchor" aria-hidden="true" id="metadata-retrieval"></a><a href="#metadata-retrieval" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Metadata Retrieval</h5>
+<table>
+<thead>
+<tr><th>Property</th><th>Description</th><th>Default</th></tr>
+</thead>
+<tbody>
+<tr><td><code>druid.manager.config.pollDuration</code></td><td>How often the manager polls the config table for updates.</td><td>PT1M</td></tr>
+<tr><td><code>druid.manager.segments.pollDuration</code></td><td>The duration between polls the Coordinator does for updates to the set of active segments. Generally defines the amount of lag time it can take for the Coordinator to notice new segments.</td><td>PT1M</td></tr>
+<tr><td><code>druid.manager.rules.pollDuration</code></td><td>The duration between polls the Coordinator does for updates to the set of active rules. Generally defines the amount of lag time it can take for the Coordinator to notice rules.</td><td>PT1M</td></tr>
+<tr><td><code>druid.manager.rules.defaultRule</code></td><td>The default rule for the cluster</td><td>_default</td></tr>
+<tr><td><code>druid.manager.rules.alertThreshold</code></td><td>The duration after a failed poll upon which an alert should be emitted.</td><td>PT10M</td></tr>
+</tbody>
+</table>
+<h4><a class="anchor" aria-hidden="true" id="dynamic-configuration"></a><a href="#dynamic-configuration" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Dynamic Configuration</h4>
+<p>The Coordinator has dynamic configuration to change certain behavior on the fly. The Coordinator uses a JSON spec object from the Druid <a href="/docs/0.20.0/dependencies/metadata-storage.html">metadata storage</a> config table. This object is detailed below:</p>
+<p>It is recommended that you use the Coordinator Console to configure these parameters. However, if you need to do it via HTTP, the JSON object can be submitted to the Coordinator via a POST request at:</p>
+<pre><code class="hljs">http:<span class="hljs-regexp">//</span>&lt;COORDINATOR_IP&gt;:&lt;PORT&gt;<span class="hljs-regexp">/druid/</span>coordinator<span class="hljs-regexp">/v1/</span>config
+</code></pre>
+<p>Optional Header Parameters for auditing the config change can also be specified.</p>
+<table>
+<thead>
+<tr><th>Header Param Name</th><th>Description</th><th>Default</th></tr>
+</thead>
+<tbody>
+<tr><td><code>X-Druid-Author</code></td><td>author making the config change</td><td>&quot;&quot;</td></tr>
+<tr><td><code>X-Druid-Comment</code></td><td>comment describing the change being done</td><td>&quot;&quot;</td></tr>
+</tbody>
+</table>
+<p>A sample Coordinator dynamic config JSON object is shown below:</p>
+<pre><code class="hljs css language-json">{
+  <span class="hljs-attr">"millisToWaitBeforeDeleting"</span>: <span class="hljs-number">900000</span>,
+  <span class="hljs-attr">"mergeBytesLimit"</span>: <span class="hljs-number">100000000</span>,
+  <span class="hljs-attr">"mergeSegmentsLimit"</span> : <span class="hljs-number">1000</span>,
+  <span class="hljs-attr">"maxSegmentsToMove"</span>: <span class="hljs-number">5</span>,
+  <span class="hljs-attr">"replicantLifetime"</span>: <span class="hljs-number">15</span>,
+  <span class="hljs-attr">"replicationThrottleLimit"</span>: <span class="hljs-number">10</span>,
+  <span class="hljs-attr">"emitBalancingStats"</span>: <span class="hljs-literal">false</span>,
+  <span class="hljs-attr">"killDataSourceWhitelist"</span>: [<span class="hljs-string">"wikipedia"</span>, <span class="hljs-string">"testDatasource"</span>],
+  <span class="hljs-attr">"decommissioningNodes"</span>: [<span class="hljs-string">"localhost:8182"</span>, <span class="hljs-string">"localhost:8282"</span>],
+  <span class="hljs-attr">"decommissioningMaxPercentOfMaxSegmentsToMove"</span>: <span class="hljs-number">70</span>,
+  <span class="hljs-attr">"pauseCoordination"</span>: <span class="hljs-literal">false</span>
+}
+</code></pre>
+<p>Issuing a GET request at the same URL will return the spec that is currently in place. A description of the config setup spec is shown below.</p>
+<table>
+<thead>
+<tr><th>Property</th><th>Description</th><th>Default</th></tr>
+</thead>
+<tbody>
+<tr><td><code>millisToWaitBeforeDeleting</code></td><td>How long does the Coordinator need to be a leader before it can start marking overshadowed segments as unused in metadata storage.</td><td>900000 (15 mins)</td></tr>
+<tr><td><code>mergeBytesLimit</code></td><td>The maximum total uncompressed size in bytes of segments to merge.</td><td>524288000L</td></tr>
+<tr><td><code>mergeSegmentsLimit</code></td><td>The maximum number of segments that can be in a single <a href="/docs/0.20.0/ingestion/tasks.html">append task</a>.</td><td>100</td></tr>
+<tr><td><code>maxSegmentsToMove</code></td><td>The maximum number of segments that can be moved at any given time.</td><td>5</td></tr>
+<tr><td><code>replicantLifetime</code></td><td>The maximum number of Coordinator runs for a segment to be replicated before we start alerting.</td><td>15</td></tr>
+<tr><td><code>replicationThrottleLimit</code></td><td>The maximum number of segments that can be replicated at one time.</td><td>10</td></tr>
+<tr><td><code>balancerComputeThreads</code></td><td>Thread pool size for computing moving cost of segments in segment balancing. Consider increasing this if you have a lot of segments and moving segments starts to get stuck.</td><td>1</td></tr>
+<tr><td><code>emitBalancingStats</code></td><td>Boolean flag for whether or not we should emit balancing stats. This is an expensive operation.</td><td>false</td></tr>
+<tr><td><code>killDataSourceWhitelist</code></td><td>List of specific data sources for which kill tasks are sent if property <code>druid.coordinator.kill.on</code> is true. This can be a list of comma-separated data source names or a JSON array.</td><td>none</td></tr>
+<tr><td><code>killAllDataSources</code></td><td>Send kill tasks for ALL dataSources if property <code>druid.coordinator.kill.on</code> is true. If this is set to true then <code>killDataSourceWhitelist</code> must not be specified or be empty list.</td><td>false</td></tr>
+<tr><td><code>killPendingSegmentsSkipList</code></td><td>List of data sources for which pendingSegments are <em>NOT</em> cleaned up if property <code>druid.coordinator.kill.pendingSegments.on</code> is true. This can be a list of comma-separated data sources or a JSON array.</td><td>none</td></tr>
+<tr><td><code>maxSegmentsInNodeLoadingQueue</code></td><td>The maximum number of segments that could be queued for loading to any given server. This parameter could be used to speed up segments loading process, especially if there are &quot;slow&quot; nodes in the cluster (with low loading speed) or if too much segments scheduled to be replicated to some particular node (faster loading could be preferred to better segments distribution). Desired value depends on segments loading speed, acceptable replication time and number of nodes. Value 1000 could be a start point for a rather big cluster. Default value is 0 (loading queue is unbounded)</td><td>0</td></tr>
+<tr><td><code>decommissioningNodes</code></td><td>List of historical servers to 'decommission'. Coordinator will not assign new segments to 'decommissioning' servers,  and segments will be moved away from them to be placed on non-decommissioning servers at the maximum rate specified by <code>decommissioningMaxPercentOfMaxSegmentsToMove</code>.</td><td>none</td></tr>
+<tr><td><code>decommissioningMaxPercentOfMaxSegmentsToMove</code></td><td>The maximum number of segments that may be moved away from 'decommissioning' servers to non-decommissioning (that is, active) servers during one Coordinator run. This value is relative to the total maximum segment movements allowed during one run which is determined by <code>maxSegmentsToMove</code>. If <code>decommissioningMaxPercentOfMaxSegmentsToMove</code> is 0, segments will neither be moved from <em>or to</em> 'decommissioning' servers, effectively putting them in a sort of &quot;maintenance&quot; mode that will not participate in balancing or assignment by load rules. Decommissioning can also become stalled if there are no available active servers to place the segments. By leveraging the maximum percent of decommissioning segment movements, an operator can prevent active servers from overload by prioritizing balancing, or decrease decommissioning time instead. The value should be between 0 and 100.</td><td>70</td></tr>
+<tr><td><code>pauseCoordination</code></td><td>Boolean flag for whether or not the coordinator should execute its various duties of coordinating the cluster. Setting this to true essentially pauses all coordination work while allowing the API to remain up. Duties that are paused include all classes that implement the <code>CoordinatorDuty</code> Interface. Such duties include: Segment balancing, Segment compaction, Emission of metrics controlled by the dynamic coordinator config <code>emitBalancingStats</code>, Submitting kill tasks for unused segments (if enabled), Logging of used segments in the cluster, Marking of newly unused or overshadowed segments, Matching and execution of load/drop rules for used segments, Unloading segments that are no longer marked as used from Historical servers. An example of when an admin may want to pause coordination would be if they are doing deep storage maintenance on HDFS Name Nodes with downtime and don't want the coordinator to be directing Historical Nodes to hit the Name Node with API requests until maintenance is done and the deep store is declared healthy for use again.</td><td>false</td></tr>
+</tbody>
+</table>
+<p>To view the audit history of Coordinator dynamic config issue a GET request to the URL -</p>
+<pre><code class="hljs">http://<span class="hljs-symbol">&lt;COORDINATOR_IP&gt;</span>:<span class="hljs-symbol">&lt;PORT&gt;</span>/druid/coordinator/v1/config/<span class="hljs-keyword">history</span>?interval=<span class="hljs-symbol">&lt;interval&gt;</span>
+</code></pre>
+<p>default value of interval can be specified by setting <code>druid.audit.manager.auditHistoryMillis</code> (1 week if not configured) in Coordinator runtime.properties</p>
+<p>To view last <n> entries of the audit history of Coordinator dynamic config issue a GET request to the URL -</p>
+<pre><code class="hljs">http://<span class="hljs-symbol">&lt;COORDINATOR_IP&gt;</span>:<span class="hljs-symbol">&lt;PORT&gt;</span>/druid/coordinator/v1/config/<span class="hljs-keyword">history</span>?<span class="hljs-built_in">count</span>=<span class="hljs-symbol">&lt;n&gt;</span>
+</code></pre>
+<h5><a class="anchor" aria-hidden="true" id="lookups-dynamic-configuration"></a><a href="#lookups-dynamic-configuration" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Lookups Dynamic Configuration</h5>
+<p>These configuration options control the behavior of the Lookup dynamic configuration described in the <a href="/docs/0.20.0/querying/lookups.html">lookups page</a></p>
+<table>
+<thead>
+<tr><th>Property</th><th>Description</th><th>Default</th></tr>
+</thead>
+<tbody>
+<tr><td><code>druid.manager.lookups.hostDeleteTimeout</code></td><td>How long to wait for a <code>DELETE</code> request to a particular process before considering the <code>DELETE</code> a failure</td><td>PT1S</td></tr>
+<tr><td><code>druid.manager.lookups.hostUpdateTimeout</code></td><td>How long to wait for a <code>POST</code> request to a particular process before considering the <code>POST</code> a failure</td><td>PT10S</td></tr>
+<tr><td><code>druid.manager.lookups.deleteAllTimeout</code></td><td>How long to wait for all <code>DELETE</code> requests to finish before considering the delete attempt a failure</td><td>PT10S</td></tr>
+<tr><td><code>druid.manager.lookups.updateAllTimeout</code></td><td>How long to wait for all <code>POST</code> requests to finish before considering the attempt a failure</td><td>PT60S</td></tr>
+<tr><td><code>druid.manager.lookups.threadPoolSize</code></td><td>How many processes can be managed concurrently (concurrent POST and DELETE requests). Requests this limit will wait in a queue until a slot becomes available.</td><td>10</td></tr>
+<tr><td><code>druid.manager.lookups.period</code></td><td>How many milliseconds between checks for configuration changes</td><td>30_000</td></tr>
+</tbody>
+</table>
+<h5><a class="anchor" aria-hidden="true" id="compaction-dynamic-configuration"></a><a href="#compaction-dynamic-configuration" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Compaction Dynamic Configuration</h5>
+<p>Compaction configurations can also be set or updated dynamically using
+<a href="../operations/api-reference.html#compaction-configuration">Coordinator's API</a> without restarting Coordinators.</p>
+<p>For details about segment compaction, please check <a href="/docs/0.20.0/operations/segment-optimization.html">Segment Size Optimization</a>.</p>
+<p>A description of the compaction config is:</p>
+<table>
+<thead>
+<tr><th>Property</th><th>Description</th><th>Required</th></tr>
+</thead>
+<tbody>
+<tr><td><code>dataSource</code></td><td>dataSource name to be compacted.</td><td>yes</td></tr>
+<tr><td><code>taskPriority</code></td><td><a href="../ingestion/tasks.html#priority">Priority</a> of compaction task.</td><td>no (default = 25)</td></tr>
+<tr><td><code>inputSegmentSizeBytes</code></td><td>Maximum number of total segment bytes processed per compaction task. Since a time chunk must be processed in its entirety, if the segments for a particular time chunk have a total size in bytes greater than this parameter, compaction will not run for that time chunk. Because each compaction task runs with a single thread, setting this value too far above 1–2GB will result in compaction tasks taking an excessive amount of time.</td><td>no (default = 419430400)</td></tr>
+<tr><td><code>maxRowsPerSegment</code></td><td>Max number of rows per segment after compaction.</td><td>no</td></tr>
+<tr><td><code>skipOffsetFromLatest</code></td><td>The offset for searching segments to be compacted. Strongly recommended to set for realtime dataSources.</td><td>no (default = &quot;P1D&quot;)</td></tr>
+<tr><td><code>tuningConfig</code></td><td>Tuning config for compaction tasks. See below <a href="#compaction-tuningconfig">Compaction Task TuningConfig</a>.</td><td>no</td></tr>
+<tr><td><code>taskContext</code></td><td><a href="../ingestion/tasks.html#context">Task context</a> for compaction tasks.</td><td>no</td></tr>
+</tbody>
+</table>
+<p>An example of compaction config is:</p>
+<pre><code class="hljs css language-json">{
+  <span class="hljs-attr">"dataSource"</span>: <span class="hljs-string">"wikiticker"</span>
+}
+</code></pre>
+<p>Note that compaction tasks can fail if their locks are revoked by other tasks of higher priorities.
+Since realtime tasks have a higher priority than compaction task by default,
+it can be problematic if there are frequent conflicts between compaction tasks and realtime tasks.
+If this is the case, the coordinator's automatic compaction might get stuck because of frequent compaction task failures.
+This kind of problem may happen especially in Kafka/Kinesis indexing systems which allow late data arrival.
+If you see this problem, it's recommended to set <code>skipOffsetFromLatest</code> to some large enough value to avoid such conflicts between compaction tasks and realtime tasks.</p>
+<h6><a class="anchor" aria-hidden="true" id="compaction-tuningconfig"></a><a href="#compaction-tuningconfig" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Compaction TuningConfig</h6>
+<p>Auto compaction supports a subset of the <a href="/docs/0.20.0/ingestion/native-batch.html#tuningconfig">tuningConfig for Parallel task</a>.
+The below is a list of the supported configurations for auto compaction.</p>
+<table>
+<thead>
+<tr><th>Property</th><th>Description</th><th>Required</th></tr>
+</thead>
+<tbody>
+<tr><td>type</td><td>The task type, this should always be <code>index_parallel</code>.</td><td>yes</td></tr>
+<tr><td><code>maxRowsInMemory</code></td><td>Used in determining when intermediate persists to disk should occur. Normally user does not need to set this, but depending on the nature of data, if rows are short in terms of bytes, user may not want to store a million rows in memory and this value should be set.</td><td>no (default = 1000000)</td></tr>
+<tr><td><code>maxBytesInMemory</code></td><td>Used in determining when intermediate persists to disk should occur. Normally this is computed internally and user does not need to set it. This value represents number of bytes to aggregate in heap memory before persisting. This is based on a rough estimate of memory usage and not actual usage. The maximum heap memory usage for indexing is <code>maxBytesInMemory</code> * (2 + <code>maxPendingPersists</code>)</td><td>no (default = 1/6 of max JVM memory)</td></tr>
+<tr><td><code>splitHintSpec</code></td><td>Used to give a hint to control the amount of data that each first phase task reads. This hint could be ignored depending on the implementation of the input source. See <a href="/docs/0.20.0/ingestion/native-batch.html#split-hint-spec">Split hint spec</a> for more details.</td><td>no (default = size-based split hint spec)</td></tr>
+<tr><td><code>partitionsSpec</code></td><td>Defines how to partition data in each time chunk, see <a href="/docs/0.20.0/ingestion/native-batch.html#partitionsspec"><code>PartitionsSpec</code></a></td><td>no (default = <code>dynamic</code>)</td></tr>
+<tr><td><code>indexSpec</code></td><td>Defines segment storage format options to be used at indexing time, see <a href="/docs/0.20.0/ingestion/index.html#indexspec">IndexSpec</a></td><td>no</td></tr>
+<tr><td><code>indexSpecForIntermediatePersists</code></td><td>Defines segment storage format options to be used at indexing time for intermediate persisted temporary segments. this can be used to disable dimension/metric compression on intermediate segments to reduce memory required for final merging. however, disabling compression on intermediate segments might increase page cache use while they are used before getting merged into final segment published, see <a href="/docs/0.20.0/ingestion/index.html#indexspec">IndexSpec</a> for possible values.</td><td>no</td></tr>
+<tr><td><code>maxPendingPersists</code></td><td>Maximum number of persists that can be pending but not started. If this limit would be exceeded by a new intermediate persist, ingestion will block until the currently-running persist finishes. Maximum heap memory usage for indexing scales with <code>maxRowsInMemory</code> * (2 + <code>maxPendingPersists</code>).</td><td>no (default = 0, meaning one persist can be running concurrently with ingestion, and none can be queued up)</td></tr>
+<tr><td><code>pushTimeout</code></td><td>Milliseconds to wait for pushing segments. It must be &gt;= 0, where 0 means to wait forever.</td><td>no (default = 0)</td></tr>
+<tr><td><code>segmentWriteOutMediumFactory</code></td><td>Segment write-out medium to use when creating segments. See <a href="/docs/0.20.0/ingestion/native-batch.html#segmentwriteoutmediumfactory">SegmentWriteOutMediumFactory</a>.</td><td>no (default is the value from <code>druid.peon.defaultSegmentWriteOutMediumFactory.type</code> is used)</td></tr>
+<tr><td><code>maxNumConcurrentSubTasks</code></td><td>Maximum number of worker tasks which can be run in parallel at the same time. The supervisor task would spawn worker tasks up to <code>maxNumConcurrentSubTasks</code> regardless of the current available task slots. If this value is set to 1, the supervisor task processes data ingestion on its own instead of spawning worker tasks. If this value is set to too large, too many worker tasks can be created which might block other ingestion. Check <a href="/docs/0.20.0/ingestion/native-batch.html#capacity-planning">Capacity Planning</a> for more details.</td><td>no (default = 1)</td></tr>
+<tr><td><code>maxRetry</code></td><td>Maximum number of retries on task failures.</td><td>no (default = 3)</td></tr>
+<tr><td><code>maxNumSegmentsToMerge</code></td><td>Max limit for the number of segments that a single task can merge at the same time in the second phase. Used only with <code>hashed</code> or <code>single_dim</code> partitionsSpec.</td><td>no (default = 100)</td></tr>
+<tr><td><code>totalNumMergeTasks</code></td><td>Total number of tasks to merge segments in the merge phase when <code>partitionsSpec</code> is set to <code>hashed</code> or <code>single_dim</code>.</td><td>no (default = 10)</td></tr>
+<tr><td><code>taskStatusCheckPeriodMs</code></td><td>Polling period in milliseconds to check running task statuses.</td><td>no (default = 1000)</td></tr>
+<tr><td><code>chatHandlerTimeout</code></td><td>Timeout for reporting the pushed segments in worker tasks.</td><td>no (default = PT10S)</td></tr>
+<tr><td><code>chatHandlerNumRetries</code></td><td>Retries for reporting the pushed segments in worker tasks.</td><td>no (default = 5)</td></tr>
+</tbody>
+</table>
+<h3><a class="anchor" aria-hidden="true" id="overlord"></a><a href="#overlord" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Overlord</h3>
+<p>For general Overlord Process information, see <a href="/docs/0.20.0/design/overlord.html">here</a>.</p>
+<h4><a class="anchor" aria-hidden="true" id="overlord-static-configuration"></a><a href="#overlord-static-configuration" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Overlord Static Configuration</h4>
+<p>These Overlord static configurations can be defined in the <code>overlord/runtime.properties</code> file.</p>
+<h5><a class="anchor" aria-hidden="true" id="overlord-process-configs"></a><a href="#overlord-process-configs" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Overlord Process Configs</h5>
+<table>
+<thead>
+<tr><th>Property</th><th>Description</th><th>Default</th></tr>
+</thead>
+<tbody>
+<tr><td><code>druid.host</code></td><td>The host for the current process. This is used to advertise the current processes location as reachable from another process and should generally be specified such that <code>http://${druid.host}/</code> could actually talk to this process</td><td>InetAddress.getLocalHost().getCanonicalHostName()</td></tr>
+<tr><td><code>druid.bindOnHost</code></td><td>Indicating whether the process's internal jetty server bind on <code>druid.host</code>. Default is false, which means binding to all interfaces.</td><td>false</td></tr>
+<tr><td><code>druid.plaintextPort</code></td><td>This is the port to actually listen on; unless port mapping is used, this will be the same port as is on <code>druid.host</code></td><td>8090</td></tr>
+<tr><td><code>druid.tlsPort</code></td><td>TLS port for HTTPS connector, if <a href="/docs/0.20.0/operations/tls-support.html">druid.enableTlsPort</a> is set then this config will be used. If <code>druid.host</code> contains port then that port will be ignored. This should be a non-negative Integer.</td><td>8290</td></tr>
+<tr><td><code>druid.service</code></td><td>The name of the service. This is used as a dimension when emitting metrics and alerts to differentiate between the various services</td><td>druid/overlord</td></tr>
+</tbody>
+</table>
+<h5><a class="anchor" aria-hidden="true" id="overlord-operations"></a><a href="#overlord-operations" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Overlord Operations</h5>
+<table>
+<thead>
+<tr><th>Property</th><th>Description</th><th>Default</th></tr>
+</thead>
+<tbody>
+<tr><td><code>druid.indexer.runner.type</code></td><td>Choices &quot;local&quot; or &quot;remote&quot;. Indicates whether tasks should be run locally or in a distributed environment. Experimental task runner &quot;httpRemote&quot; is also available which is same as &quot;remote&quot; but uses HTTP to interact with Middle Managers instead of Zookeeper.</td><td>local</td></tr>
+<tr><td><code>druid.indexer.storage.type</code></td><td>Choices are &quot;local&quot; or &quot;metadata&quot;. Indicates whether incoming tasks should be stored locally (in heap) or in metadata storage. Storing incoming tasks in metadata storage allows for tasks to be resumed if the Overlord should fail.</td><td>local</td></tr>
+<tr><td><code>druid.indexer.storage.recentlyFinishedThreshold</code></td><td>A duration of time to store task results.</td><td>PT24H</td></tr>
+<tr><td><code>druid.indexer.tasklock.forceTimeChunkLock</code></td><td><em><strong>Setting this to false is still experimental</strong></em><br/> If set, all tasks are enforced to use time chunk lock. If not set, each task automatically chooses a lock type to use. This configuration can be overwritten by setting <code>forceTimeChunkLock</code> in the <a href="/docs/0.20.0/ingestion/tasks.html#context">task context</a>. See <a href="/docs/0.20.0/ingestion/tasks.html#context">Task Locking &amp; Priority</a> for more details about locking in tasks.</td><td>true</td></tr>
+<tr><td><code>druid.indexer.queue.maxSize</code></td><td>Maximum number of active tasks at one time.</td><td>Integer.MAX_VALUE</td></tr>
+<tr><td><code>druid.indexer.queue.startDelay</code></td><td>Sleep this long before starting Overlord queue management. This can be useful to give a cluster time to re-orient itself after e.g. a widespread network issue.</td><td>PT1M</td></tr>
+<tr><td><code>druid.indexer.queue.restartDelay</code></td><td>Sleep this long when Overlord queue management throws an exception before trying again.</td><td>PT30S</td></tr>
+<tr><td><code>druid.indexer.queue.storageSyncRate</code></td><td>Sync Overlord state this often with an underlying task persistence mechanism.</td><td>PT1M</td></tr>
+</tbody>
+</table>
+<p>The following configs only apply if the Overlord is running in remote mode. For a description of local vs. remote mode, please see (../design/overlord.html).</p>
+<table>
+<thead>
+<tr><th>Property</th><th>Description</th><th>Default</th></tr>
+</thead>
+<tbody>
+<tr><td><code>druid.indexer.runner.taskAssignmentTimeout</code></td><td>How long to wait after a task as been assigned to a MiddleManager before throwing an error.</td><td>PT5M</td></tr>
+<tr><td><code>druid.indexer.runner.minWorkerVersion</code></td><td>The minimum MiddleManager version to send tasks to.</td><td>&quot;0&quot;</td></tr>
+<tr><td><code>druid.indexer.runner.compressZnodes</code></td><td>Indicates whether or not the Overlord should expect MiddleManagers to compress Znodes.</td><td>true</td></tr>
+<tr><td><code>druid.indexer.runner.maxZnodeBytes</code></td><td>The maximum size Znode in bytes that can be created in Zookeeper. Human-readable format is supported, see <a href="/docs/0.20.0/configuration/human-readable-byte.html">here</a>.</td><td>512 KiB</td></tr>
+<tr><td><code>druid.indexer.runner.taskCleanupTimeout</code></td><td>How long to wait before failing a task after a MiddleManager is disconnected from Zookeeper.</td><td>PT15M</td></tr>
+<tr><td><code>druid.indexer.runner.taskShutdownLinkTimeout</code></td><td>How long to wait on a shutdown request to a MiddleManager before timing out</td><td>PT1M</td></tr>
+<tr><td><code>druid.indexer.runner.pendingTasksRunnerNumThreads</code></td><td>Number of threads to allocate pending-tasks to workers, must be at least 1.</td><td>1</td></tr>
+<tr><td><code>druid.indexer.runner.maxRetriesBeforeBlacklist</code></td><td>Number of consecutive times the MiddleManager can fail tasks,  before the worker is blacklisted, must be at least 1</td><td>5</td></tr>
+<tr><td><code>druid.indexer.runner.workerBlackListBackoffTime</code></td><td>How long to wait before a task is whitelisted again. This value should be greater that the value set for taskBlackListCleanupPeriod.</td><td>PT15M</td></tr>
+<tr><td><code>druid.indexer.runner.workerBlackListCleanupPeriod</code></td><td>A duration after which the cleanup thread will startup to clean blacklisted workers.</td><td>PT5M</td></tr>
+<tr><td><code>druid.indexer.runner.maxPercentageBlacklistWorkers</code></td><td>The maximum percentage of workers to blacklist, this must be between 0 and 100.</td><td>20</td></tr>
+</tbody>
+</table>
+<p>There are additional configs for autoscaling (if it is enabled):</p>
+<table>
+<thead>
+<tr><th>Property</th><th>Description</th><th>Default</th></tr>
+</thead>
+<tbody>
+<tr><td><code>druid.indexer.autoscale.strategy</code></td><td>Choices are &quot;noop&quot;, &quot;ec2&quot; or &quot;gce&quot;. Sets the strategy to run when autoscaling is required.</td><td>noop</td></tr>
+<tr><td><code>druid.indexer.autoscale.doAutoscale</code></td><td>If set to &quot;true&quot; autoscaling will be enabled.</td><td>false</td></tr>
+<tr><td><code>druid.indexer.autoscale.provisionPeriod</code></td><td>How often to check whether or not new MiddleManagers should be added.</td><td>PT1M</td></tr>
+<tr><td><code>druid.indexer.autoscale.terminatePeriod</code></td><td>How often to check when MiddleManagers should be removed.</td><td>PT5M</td></tr>
+<tr><td><code>druid.indexer.autoscale.originTime</code></td><td>The starting reference timestamp that the terminate period increments upon.</td><td>2012-01-01T00:55:00.000Z</td></tr>
+<tr><td><code>druid.indexer.autoscale.workerIdleTimeout</code></td><td>How long can a worker be idle (not a run task) before it can be considered for termination.</td><td>PT90M</td></tr>
+<tr><td><code>druid.indexer.autoscale.maxScalingDuration</code></td><td>How long the Overlord will wait around for a MiddleManager to show up before giving up.</td><td>PT15M</td></tr>
+<tr><td><code>druid.indexer.autoscale.numEventsToTrack</code></td><td>The number of autoscaling related events (node creation and termination) to track.</td><td>10</td></tr>
+<tr><td><code>druid.indexer.autoscale.pendingTaskTimeout</code></td><td>How long a task can be in &quot;pending&quot; state before the Overlord tries to scale up.</td><td>PT30S</td></tr>
+<tr><td><code>druid.indexer.autoscale.workerVersion</code></td><td>If set, will only create nodes of set version during autoscaling. Overrides dynamic configuration.</td><td>null</td></tr>
+<tr><td><code>druid.indexer.autoscale.workerPort</code></td><td>The port that MiddleManagers will run on.</td><td>8080</td></tr>
+</tbody>
+</table>
+<h5><a class="anchor" aria-hidden="true" id="supervisors"></a><a href="#supervisors" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Supervisors</h5>
+<table>
+<thead>
+<tr><th>Property</th><th>Description</th><th>Default</th></tr>
+</thead>
+<tbody>
+<tr><td><code>druid.supervisor.healthinessThreshold</code></td><td>The number of successful runs before an unhealthy supervisor is again considered healthy.</td><td>3</td></tr>
+<tr><td><code>druid.supervisor.unhealthinessThreshold</code></td><td>The number of failed runs before the supervisor is considered unhealthy.</td><td>3</td></tr>
+<tr><td><code>druid.supervisor.taskHealthinessThreshold</code></td><td>The number of consecutive task successes before an unhealthy supervisor is again considered healthy.</td><td>3</td></tr>
+<tr><td><code>druid.supervisor.taskUnhealthinessThreshold</code></td><td>The number of consecutive task failures before the supervisor is considered unhealthy.</td><td>3</td></tr>
+<tr><td><code>druid.supervisor.storeStackTrace</code></td><td>Whether full stack traces of supervisor exceptions should be stored and returned by the supervisor <code>/status</code> endpoint.</td><td>false</td></tr>
+<tr><td><code>druid.supervisor.maxStoredExceptionEvents</code></td><td>The maximum number of exception events that can be returned through the supervisor <code>/status</code> endpoint.</td><td><code>max(healthinessThreshold, unhealthinessThreshold)</code></td></tr>
+</tbody>
+</table>
+<h4><a class="anchor" aria-hidden="true" id="overlord-dynamic-configuration"></a><a href="#overlord-dynamic-configuration" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Overlord Dynamic Configuration</h4>
+<p>The Overlord can dynamically change worker behavior.</p>
+<p>The JSON object can be submitted to the Overlord via a POST request at:</p>
+<pre><code class="hljs">http:<span class="hljs-regexp">//</span>&lt;OVERLORD_IP&gt;:&lt;port&gt;<span class="hljs-regexp">/druid/i</span>ndexer<span class="hljs-regexp">/v1/</span>worker
+</code></pre>
+<p>Optional Header Parameters for auditing the config change can also be specified.</p>
+<table>
+<thead>
+<tr><th>Header Param Name</th><th>Description</th><th>Default</th></tr>
+</thead>
+<tbody>
+<tr><td><code>X-Druid-Author</code></td><td>author making the config change</td><td>&quot;&quot;</td></tr>
+<tr><td><code>X-Druid-Comment</code></td><td>comment describing the change being done</td><td>&quot;&quot;</td></tr>
+</tbody>
+</table>
+<p>A sample worker config spec is shown below:</p>
+<pre><code class="hljs css language-json">{
+  <span class="hljs-attr">"selectStrategy"</span>: {
+    <span class="hljs-attr">"type"</span>: <span class="hljs-string">"fillCapacity"</span>,
+    <span class="hljs-attr">"affinityConfig"</span>: {
+      <span class="hljs-attr">"affinity"</span>: {
+        <span class="hljs-attr">"datasource1"</span>: [<span class="hljs-string">"host1:port"</span>, <span class="hljs-string">"host2:port"</span>],
+        <span class="hljs-attr">"datasource2"</span>: [<span class="hljs-string">"host3:port"</span>]
+      }
+    }
+  },
+  <span class="hljs-attr">"autoScaler"</span>: {
+    <span class="hljs-attr">"type"</span>: <span class="hljs-string">"ec2"</span>,
+    <span class="hljs-attr">"minNumWorkers"</span>: <span class="hljs-number">2</span>,
+    <span class="hljs-attr">"maxNumWorkers"</span>: <span class="hljs-number">12</span>,
+    <span class="hljs-attr">"envConfig"</span>: {
+      <span class="hljs-attr">"availabilityZone"</span>: <span class="hljs-string">"us-east-1a"</span>,
+      <span class="hljs-attr">"nodeData"</span>: {
+        <span class="hljs-attr">"amiId"</span>: <span class="hljs-string">"${AMI}"</span>,
+        <span class="hljs-attr">"instanceType"</span>: <span class="hljs-string">"c3.8xlarge"</span>,
+        <span class="hljs-attr">"minInstances"</span>: <span class="hljs-number">1</span>,
+        <span class="hljs-attr">"maxInstances"</span>: <span class="hljs-number">1</span>,
+        <span class="hljs-attr">"securityGroupIds"</span>: [<span class="hljs-string">"${IDs}"</span>],
+        <span class="hljs-attr">"keyName"</span>: <span class="hljs-string">"${KEY_NAME}"</span>
+      },
+      <span class="hljs-attr">"userData"</span>: {
+        <span class="hljs-attr">"impl"</span>: <span class="hljs-string">"string"</span>,
+        <span class="hljs-attr">"data"</span>: <span class="hljs-string">"${SCRIPT_COMMAND}"</span>,
+        <span class="hljs-attr">"versionReplacementString"</span>: <span class="hljs-string">":VERSION:"</span>,
+        <span class="hljs-attr">"version"</span>: <span class="hljs-literal">null</span>
+      }
+    }
+  }
+}
+</code></pre>
+<p>Issuing a GET request at the same URL will return the current worker config spec that is currently in place. The worker config spec list above is just a sample for EC2 and it is possible to extend the code base for other deployment environments. A description of the worker config spec is shown below.</p>
+<table>
+<thead>
+<tr><th>Property</th><th>Description</th><th>Default</th></tr>
+</thead>
+<tbody>
+<tr><td><code>selectStrategy</code></td><td>How to assign tasks to MiddleManagers. Choices are <code>fillCapacity</code>, <code>equalDistribution</code>, and <code>javascript</code>.</td><td>equalDistribution</td></tr>
+<tr><td><code>autoScaler</code></td><td>Only used if autoscaling is enabled. See below.</td><td>null</td></tr>
+</tbody>
+</table>
+<p>To view the audit history of worker config issue a GET request to the URL -</p>
+<pre><code class="hljs">http://<span class="hljs-symbol">&lt;OVERLORD_IP&gt;</span>:<span class="hljs-symbol">&lt;port&gt;</span>/druid/indexer/v1/worker/<span class="hljs-keyword">history</span>?interval=<span class="hljs-symbol">&lt;interval&gt;</span>
+</code></pre>
+<p>default value of interval can be specified by setting <code>druid.audit.manager.auditHistoryMillis</code> (1 week if not configured) in Overlord runtime.properties.</p>
+<p>To view last <n> entries of the audit history of worker config issue a GET request to the URL -</p>
+<pre><code class="hljs">http://<span class="hljs-symbol">&lt;OVERLORD_IP&gt;</span>:<span class="hljs-symbol">&lt;port&gt;</span>/druid/indexer/v1/worker/<span class="hljs-keyword">history</span>?<span class="hljs-built_in">count</span>=<span class="hljs-symbol">&lt;n&gt;</span>
+</code></pre>
+<h5><a class="anchor" aria-hidden="true" id="worker-select-strategy"></a><a href="#worker-select-strategy" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Worker Select Strategy</h5>
+<p>Worker select strategies control how Druid assigns tasks to MiddleManagers.</p>
+<h6><a class="anchor" aria-hidden="true" id="equal-distribution"></a><a href="#equal-distribution" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Equal Distribution</h6>
+<p>Tasks are assigned to the MiddleManager with the most free slots at the time the task begins running. This is useful if
+you want work evenly distributed across your MiddleManagers.</p>
+<table>
+<thead>
+<tr><th>Property</th><th>Description</th><th>Default</th></tr>
+</thead>
+<tbody>
+<tr><td><code>type</code></td><td><code>equalDistribution</code>.</td><td>required; must be <code>equalDistribution</code></td></tr>
+<tr><td><code>affinityConfig</code></td><td><a href="#affinity">Affinity config</a> object</td><td>null (no affinity)</td></tr>
+</tbody>
+</table>
+<h6><a class="anchor" aria-hidden="true" id="equal-distribution-with-category-spec"></a><a href="#equal-distribution-with-category-spec" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Equal Distribution With Category Spec</h6>
+<p>This strategy is a variant of <code>Equal Distribution</code>, which support <code>workerCategorySpec</code> field rather than <code>affinityConfig</code>. By specifying <code>workerCategorySpec</code>, you can assign tasks to run on different categories of MiddleManagers based on the tasks' <strong>taskType</strong> and <strong>dataSource name</strong>. This strategy can't work with <code>AutoScaler</code> since the behavior is undefined.</p>
+<table>
+<thead>
+<tr><th>Property</th><th>Description</th><th>Default</th></tr>
+</thead>
+<tbody>
+<tr><td><code>type</code></td><td><code>equalDistributionWithCategorySpec</code>.</td><td>required; must be <code>equalDistributionWithCategorySpec</code></td></tr>
+<tr><td><code>workerCategorySpec</code></td><td><a href="#workercategoryspec">Worker Category Spec</a> object</td><td>null (no worker category spec)</td></tr>
+</tbody>
+</table>
+<p>Example: specify tasks default to run on <strong>c1</strong> whose task
+type is &quot;index_kafka&quot;, while dataSource &quot;ds1&quot; run on <strong>c2</strong>.</p>
+<pre><code class="hljs css language-json">{
+  <span class="hljs-attr">"selectStrategy"</span>: {
+    <span class="hljs-attr">"type"</span>: <span class="hljs-string">"equalDistributionWithCategorySpec"</span>,
+    <span class="hljs-attr">"workerCategorySpec"</span>: {
+      <span class="hljs-attr">"strong"</span>: <span class="hljs-literal">false</span>,
+      <span class="hljs-attr">"categoryMap"</span>: {
+        <span class="hljs-attr">"index_kafka"</span>: {
+           <span class="hljs-attr">"defaultCategory"</span>: <span class="hljs-string">"c1"</span>,
+           <span class="hljs-attr">"categoryAffinity"</span>: {
+              <span class="hljs-attr">"ds1"</span>: <span class="hljs-string">"c2"</span>
+           }
+        }
+      }
+    }
+  }
+}
+</code></pre>
+<h6><a class="anchor" aria-hidden="true" id="fill-capacity"></a><a href="#fill-capacity" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Fill Capacity</h6>
+<p>Tasks are assigned to the worker with the most currently-running tasks at the time the task begins running. This is
+useful in situations where you are elastically auto-scaling MiddleManagers, since it will tend to pack some full and
+leave others empty. The empty ones can be safely terminated.</p>
+<p>Note that if <code>druid.indexer.runner.pendingTasksRunnerNumThreads</code> is set to <em>N</em> &gt; 1, then this strategy will fill <em>N</em>
+MiddleManagers up to capacity simultaneously, rather than a single MiddleManager.</p>
+<table>
+<thead>
+<tr><th>Property</th><th>Description</th><th>Default</th></tr>
+</thead>
+<tbody>
+<tr><td><code>type</code></td><td><code>fillCapacity</code>.</td><td>required; must be <code>fillCapacity</code></td></tr>
+<tr><td><code>affinityConfig</code></td><td><a href="#affinity">Affinity config</a> object</td><td>null (no affinity)</td></tr>
+</tbody>
+</table>
+<h6><a class="anchor" aria-hidden="true" id="fill-capacity-with-category-spec"></a><a href="#fill-capacity-with-category-spec" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Fill Capacity With Category Spec</h6>
+<p>This strategy is a variant of <code>Fill Capacity</code>, which support <code>workerCategorySpec</code> field rather than <code>affinityConfig</code>. The usage is the same with <em>equalDistributionWithCategorySpec</em> strategy. This strategy can't work with <code>AutoScaler</code> since the behavior is undefined.</p>
+<table>
+<thead>
+<tr><th>Property</th><th>Description</th><th>Default</th></tr>
+</thead>
+<tbody>
+<tr><td><code>type</code></td><td><code>fillCapacityWithCategorySpec</code>.</td><td>required; must be <code>fillCapacityWithCategorySpec</code></td></tr>
+<tr><td><code>workerCategorySpec</code></td><td><a href="#workercategoryspec">Worker Category Spec</a> object</td><td>null (no worker category spec)</td></tr>
+</tbody>
+</table>
+<blockquote>
+<p>Before using the <em>equalDistributionWithCategorySpec</em> and <em>fillCapacityWithCategorySpec</em> strategies, you must upgrade overlord and all MiddleManagers to the version that support this feature.</p>
+</blockquote>
+<p><a name="javascript-worker-select-strategy"></a></p>
+<h6><a class="anchor" aria-hidden="true" id="javascript-1"></a><a href="#javascript-1" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>JavaScript</h6>
+<p>Allows defining arbitrary logic for selecting workers to run task using a JavaScript function.
+The function is passed remoteTaskRunnerConfig, map of workerId to available workers and task to be executed and returns the workerId on which the task should be run or null if the task cannot be run.
+It can be used for rapid development of missing features where the worker selection logic is to be changed or tuned often.
+If the selection logic is quite complex and cannot be easily tested in JavaScript environment,
+its better to write a druid extension module with extending current worker selection strategies written in java.</p>
+<table>
+<thead>
+<tr><th>Property</th><th>Description</th><th>Default</th></tr>
+</thead>
+<tbody>
+<tr><td><code>type</code></td><td><code>javascript</code>.</td><td>required; must be <code>javascript</code></td></tr>
+<tr><td><code>function</code></td><td>String representing JavaScript function</td><td></td></tr>
+</tbody>
+</table>
+<p>Example: a function that sends batch_index_task to workers 10.0.0.1 and 10.0.0.2 and all other tasks to other available workers.</p>
+<pre><code class="hljs">{
+"type":"javascript",
+"function":"function (config, zkWorkers, task) {<span class="hljs-symbol">\n</span>var batch_workers = new java.util.ArrayList();<span class="hljs-symbol">\n</span>batch_workers.add(<span class="hljs-symbol">\"</span>middleManager1_hostname:8091<span class="hljs-symbol">\"</span>);<span class="hljs-symbol">\n</span>batch_workers.add(<span class="hljs-symbol">\"</span>middleManager2_hostname:8091<span class="hljs-symbol">\"</span>);<span class="hljs-symbol">\n</span>workers = zkWorkers.keySet().toArray();<span class="hljs-symbol">\n</span>var sortedWorkers = new Array()<span class="hljs-symbol">\n</span>;for(var i = 0; i &lt; workers.length; i++){<span class="hljs-symbol">\n</span> sortedWorkers[i] = workers[i];<span class="hljs-symbol">\n</span>}<span class="hljs-symbol">\n</span>Array.prototype.sort.call(sortedWorkers,function(a, b){return zkWorkers.get(b).getCurrCapacityUsed() - zkWorkers.get(a).getCurrCapacityUsed();});<span class="hljs-symbol">\n</span>var minWorkerVer = config.getMinWorkerVersion();<span class="hljs-symbol">\n</span>for (var i = 0; i &lt; sortedWorkers.length; i++) {<span class="hljs-symbol">\n</span> var worker = sortedWorkers[i];<span class="hljs-symbol">\n</span>  var zkWorker = zkWorkers.get(worker);<span class="hljs-symbol">\n</span>  if(zkWorker.canRunTask(task) &amp;&amp; zkWorker.isValidVersion(minWorkerVer)){<span class="hljs-symbol">\n</span>    if(task.getType() == 'index_hadoop' &amp;&amp; batch_workers.contains(worker)){<span class="hljs-symbol">\n</span>      return worker;<span class="hljs-symbol">\n</span>    } else {<span class="hljs-symbol">\n</span>      if(task.getType() != 'index_hadoop' &amp;&amp; !batch_workers.contains(worker)){<span class="hljs-symbol">\n</span>        return worker;<span class="hljs-symbol">\n</span>      }<span class="hljs-symbol">\n</span>    }<span class="hljs-symbol">\n</span>  }<span class="hljs-symbol">\n</span>}<span class="hljs-symbol">\n</span>return null;<span class="hljs-symbol">\n</span>}"
+}
+</code></pre>
+<blockquote>
+<p>JavaScript-based functionality is disabled by default. Please refer to the Druid <a href="/docs/0.20.0/development/javascript.html">JavaScript programming guide</a> for guidelines about using Druid's JavaScript functionality, including instructions on how to enable it.</p>
+</blockquote>
+<h6><a class="anchor" aria-hidden="true" id="affinity"></a><a href="#affinity" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Affinity</h6>
+<p>Affinity configs can be provided to the <em>equalDistribution</em> and <em>fillCapacity</em> strategies using the &quot;affinityConfig&quot;
+field. If not provided, the default is to not use affinity at all.</p>
+<table>
+<thead>
+<tr><th>Property</th><th>Description</th><th>Default</th></tr>
+</thead>
+<tbody>
+<tr><td><code>affinity</code></td><td>JSON object mapping a datasource String name to a list of indexing service MiddleManager host:port String values. Druid doesn't perform DNS resolution, so the 'host' value must match what is configured on the MiddleManager and what the MiddleManager announces itself as (examine the Overlord logs to see what your MiddleManager announces itself as).</td><td>{}</td></tr>
+<tr><td><code>strong</code></td><td>With weak affinity (the default), tasks for a dataSource may be assigned to other MiddleManagers if their affinity-mapped MiddleManagers are not able to run all pending tasks in the queue for that dataSource. With strong affinity, tasks for a dataSource will only ever be assigned to their affinity-mapped MiddleManagers, and will wait in the pending queue if necessary.</td><td>false</td></tr>
+</tbody>
+</table>
+<h6><a class="anchor" aria-hidden="true" id="workercategoryspec"></a><a href="#workercategoryspec" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>WorkerCategorySpec</h6>
+<p>WorkerCategorySpec can be provided to the <em>equalDistributionWithCategorySpec</em> and <em>fillCapacityWithCategorySpec</em> strategies using the &quot;workerCategorySpec&quot;
+field. If not provided, the default is to not use it at all.</p>
+<table>
+<thead>
+<tr><th>Property</th><th>Description</th><th>Default</th></tr>
+</thead>
+<tbody>
+<tr><td><code>categoryMap</code></td><td>A JSON map object mapping a task type String name to a <a href="#categoryconfig">CategoryConfig</a> object, by which you can specify category config for different task type.</td><td>{}</td></tr>
+<tr><td><code>strong</code></td><td>With weak workerCategorySpec (the default), tasks for a dataSource may be assigned to other MiddleManagers if the MiddleManagers specified in <code>categoryMap</code> are not able to run all pending tasks in the queue for that dataSource. With strong workerCategorySpec, tasks for a dataSource will only ever be assigned to their specified MiddleManagers, and will wait in the pending queue if necessary.</td><td>false</td></tr>
+</tbody>
+</table>
+<h6><a class="anchor" aria-hidden="true" id="categoryconfig"></a><a href="#categoryconfig" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>CategoryConfig</h6>
+<table>
+<thead>
+<tr><th>Property</th><th>Description</th><th>Default</th></tr>
+</thead>
+<tbody>
+<tr><td><code>defaultCategory</code></td><td>Specify default category for a task type.</td><td>null</td></tr>
+<tr><td><code>categoryAffinity</code></td><td>A JSON map object mapping a datasource String name to a category String name of the MiddleManager. If category isn't specified for a datasource, then using the <code>defaultCategory</code>. If no specified category and the <code>defaultCategory</code> is also null, then tasks can run on any available MiddleManagers.</td><td>null</td></tr>
+</tbody>
+</table>
+<h5><a class="anchor" aria-hidden="true" id="autoscaler"></a><a href="#autoscaler" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Autoscaler</h5>
+<p>Amazon's EC2 together with Google's GCE are currently the only supported autoscalers.</p>
+<p>EC2's autoscaler properties are:</p>
+<table>
+<thead>
+<tr><th>Property</th><th>Description</th><th>Default</th></tr>
+</thead>
+<tbody>
+<tr><td><code>minNumWorkers</code></td><td>The minimum number of workers that can be in the cluster at any given time.</td><td>0</td></tr>
+<tr><td><code>maxNumWorkers</code></td><td>The maximum number of workers that can be in the cluster at any given time.</td><td>0</td></tr>
+<tr><td><code>availabilityZone</code></td><td>What availability zone to run in.</td><td>none</td></tr>
+<tr><td><code>nodeData</code></td><td>A JSON object that describes how to launch new nodes.</td><td>none; required</td></tr>
+<tr><td><code>userData</code></td><td>A JSON object that describes how to configure new nodes. If you have set druid.indexer.autoscale.workerVersion, this must have a versionReplacementString. Otherwise, a versionReplacementString is not necessary.</td><td>none; optional</td></tr>
+</tbody>
+</table>
+<p>For GCE's properties, please refer to the <a href="/docs/0.20.0/development/extensions-contrib/gce-extensions.html">gce-extensions</a>.</p>
+<h2><a class="anchor" aria-hidden="true" id="data-server"></a><a href="#data-server" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Data Server</h2>
+<p>This section contains the configuration options for the processes that reside on Data servers (MiddleManagers/Peons and Historicals) in the suggested <a href="../design/processes.html#server-types">three-server configuration</a>.</p>
+<p>Configuration options for the experimental <a href="/docs/0.20.0/design/indexer.html">Indexer process</a> are also provided here.</p>
+<h3><a class="anchor" aria-hidden="true" id="middlemanager-and-peons"></a><a href="#middlemanager-and-peons" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>MiddleManager and Peons</h3>
+<p>These MiddleManager and Peon configurations can be defined in the <code>middleManager/runtime.properties</code> file.</p>
+<h4><a class="anchor" aria-hidden="true" id="middlemanager-process-config"></a><a href="#middlemanager-process-config" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>MiddleManager Process Config</h4>
+<table>
+<thead>
+<tr><th>Property</th><th>Description</th><th>Default</th></tr>
+</thead>
+<tbody>
+<tr><td><code>druid.host</code></td><td>The host for the current process. This is used to advertise the current processes location as reachable from another process and should generally be specified such that <code>http://${druid.host}/</code> could actually talk to this process</td><td>InetAddress.getLocalHost().getCanonicalHostName()</td></tr>
+<tr><td><code>druid.bindOnHost</code></td><td>Indicating whether the process's internal jetty server bind on <code>druid.host</code>. Default is false, which means binding to all interfaces.</td><td>false</td></tr>
+<tr><td><code>druid.plaintextPort</code></td><td>This is the port to actually listen on; unless port mapping is used, this will be the same port as is on <code>druid.host</code></td><td>8091</td></tr>
+<tr><td><code>druid.tlsPort</code></td><td>TLS port for HTTPS connector, if <a href="/docs/0.20.0/operations/tls-support.html">druid.enableTlsPort</a> is set then this config will be used. If <code>druid.host</code> contains port then that port will be ignored. This should be a non-negative Integer.</td><td>8291</td></tr>
+<tr><td><code>druid.service</code></td><td>The name of the service. This is used as a dimension when emitting metrics and alerts to differentiate between the various services</td><td>druid/middlemanager</td></tr>
+</tbody>
+</table>
+<h4><a class="anchor" aria-hidden="true" id="middlemanager-configuration"></a><a href="#middlemanager-configuration" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>MiddleManager Configuration</h4>
+<p>Middle managers pass their configurations down to their child peons. The MiddleManager requires the following configs:</p>
+<table>
+<thead>
+<tr><th>Property</th><th>Description</th><th>Default</th></tr>
+</thead>
+<tbody>
+<tr><td><code>druid.indexer.runner.allowedPrefixes</code></td><td>Whitelist of prefixes for configs that can be passed down to child peons.</td><td>&quot;com.metamx&quot;, &quot;druid&quot;, &quot;org.apache.druid&quot;, &quot;user.timezone&quot;, &quot;file.encoding&quot;, &quot;java.io.tmpdir&quot;, &quot;hadoop&quot;</td></tr>
+<tr><td><code>druid.indexer.runner.compressZnodes</code></td><td>Indicates whether or not the MiddleManagers should compress Znodes.</td><td>true</td></tr>
+<tr><td><code>druid.indexer.runner.classpath</code></td><td>Java classpath for the peon.</td><td>System.getProperty(&quot;java.class.path&quot;)</td></tr>
+<tr><td><code>druid.indexer.runner.javaCommand</code></td><td>Command required to execute java.</td><td>java</td></tr>
+<tr><td><code>druid.indexer.runner.javaOpts</code></td><td><em>DEPRECATED</em> A string of -X Java options to pass to the peon's JVM. Quotable parameters or parameters with spaces are encouraged to use javaOptsArray</td><td>&quot;&quot;</td></tr>
+<tr><td><code>druid.indexer.runner.javaOptsArray</code></td><td>A JSON array of strings to be passed in as options to the peon's JVM. This is additive to javaOpts and is recommended for properly handling arguments which contain quotes or spaces like <code>[&quot;-XX:OnOutOfMemoryError=kill -9 %p&quot;]</code></td><td><code>[]</code></td></tr>
+<tr><td><code>druid.indexer.runner.maxZnodeBytes</code></td><td>The maximum size Znode in bytes that can be created in Zookeeper.</td><td>524288</td></tr>
+<tr><td><code>druid.indexer.runner.startPort</code></td><td>Starting port used for peon processes, should be greater than 1023 and less than 65536.</td><td>8100</td></tr>
+<tr><td><code>druid.indexer.runner.endPort</code></td><td>Ending port used for peon processes, should be greater than or equal to <code>druid.indexer.runner.startPort</code> and less than 65536.</td><td>65535</td></tr>
+<tr><td><code>druid.indexer.runner.ports</code></td><td>A JSON array of integers to specify ports that used for peon processes. If provided and non-empty, ports for peon processes will be chosen from these ports. And <code>druid.indexer.runner.startPort/druid.indexer.runner.endPort</code> will be completely ignored.</td><td><code>[]</code></td></tr>
+<tr><td><code>druid.worker.ip</code></td><td>The IP of the worker.</td><td>localhost</td></tr>
+<tr><td><code>druid.worker.version</code></td><td>Version identifier for the MiddleManager.</td><td>0</td></tr>
+<tr><td><code>druid.worker.capacity</code></td><td>Maximum number of tasks the MiddleManager can accept.</td><td>Number of CPUs on the machine - 1</td></tr>
+<tr><td><code>druid.worker.category</code></td><td>A string to name the category that the MiddleManager node belongs to.</td><td><code>__default_worker_category</code></td></tr>
+</tbody>
+</table>
+<h4><a class="anchor" aria-hidden="true" id="peon-processing"></a><a href="#peon-processing" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Peon Processing</h4>
+<p>Processing properties set on the Middlemanager will be passed through to Peons.</p>
+<table>
+<thead>
+<tr><th>Property</th><th>Description</th><th>Default</th></tr>
+</thead>
+<tbody>
+<tr><td><code>druid.processing.buffer.sizeBytes</code></td><td>This specifies a buffer size for the storage of intermediate results. The computation engine in both the Historical and Realtime processes will use a scratch buffer of this size to do all of their intermediate computations off-heap. Larger values allow for more aggregations in a single pass over the data while smaller values can require more passes depending on the query that is being executed. Human-readable format is supported, see <a href="/docs/0.20.0/configuration/human-readable-byte.html">here</a>.</td><td>auto (max 1 GiB)</td></tr>
+<tr><td><code>druid.processing.buffer.poolCacheMaxCount</code></td><td>processing buffer pool caches the buffers for later use, this is the maximum count cache will grow to. note that pool can create more buffers than it can cache if necessary.</td><td>Integer.MAX_VALUE</td></tr>
+<tr><td><code>druid.processing.formatString</code></td><td>Realtime and Historical processes use this format string to name their processing threads.</td><td>processing-%s</td></tr>
+<tr><td><code>druid.processing.numMergeBuffers</code></td><td>The number of direct memory buffers available for merging query results. The buffers are sized by <code>druid.processing.buffer.sizeBytes</code>. This property is effectively a concurrency limit for queries that require merging buffers. If you are using any queries that require merge buffers (currently, just groupBy v2) then you should have at least two of these.</td><td><code>max(2, druid.processing.numThreads / 4)</code></td></tr>
+<tr><td><code>druid.processing.numThreads</code></td><td>The number of processing threads to have available for parallel processing of segments. Our rule of thumb is <code>num_cores - 1</code>, which means that even under heavy load there will still be one core available to do background tasks like talking with ZooKeeper and pulling down segments. If only one core is available, this property defaults to the value <code>1</code>.</td><td>Number of cores - 1 (or 1)</td></tr>
+<tr><td><code>druid.processing.columnCache.sizeBytes</code></td><td>Maximum size in bytes for the dimension value lookup cache. Any value greater than <code>0</code> enables the cache. It is currently disabled by default. Enabling the lookup cache can significantly improve the performance of aggregators operating on dimension values, such as the JavaScript aggregator, or cardinality aggregator, but can slow things down if the cache hit rate is low (i.e. dimensions with few repeating values). Enabling it may also require additional garbage collection tuning to avoid long GC pauses.</td><td><code>0</code> (disabled)</td></tr>
+<tr><td><code>druid.processing.fifo</code></td><td>If the processing queue should treat tasks of equal priority in a FIFO manner</td><td><code>false</code></td></tr>
+<tr><td><code>druid.processing.tmpDir</code></td><td>Path where temporary files created while processing a query should be stored. If specified, this configuration takes priority over the default <code>java.io.tmpdir</code> path.</td><td>path represented by <code>java.io.tmpdir</code></td></tr>
+</tbody>
+</table>
+<p>The amount of direct memory needed by Druid is at least
+<code>druid.processing.buffer.sizeBytes * (druid.processing.numMergeBuffers + druid.processing.numThreads + 1)</code>. You can
+ensure at least this amount of direct memory is available by providing <code>-XX:MaxDirectMemorySize=&lt;VALUE&gt;</code> in
+<code>druid.indexer.runner.javaOptsArray</code> as documented above.</p>
+<h4><a class="anchor" aria-hidden="true" id="peon-query-configuration"></a><a href="#peon-query-configuration" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Peon query configuration</h4>
+<p>See <a href="#general-query-configuration">general query configuration</a>.</p>
+<h4><a class="anchor" aria-hidden="true" id="peon-caching"></a><a href="#peon-caching" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Peon Caching</h4>
+<p>You can optionally configure caching to be enabled on the peons by setting caching configs here.</p>
+<table>
+<thead>
+<tr><th>Property</th><th>Possible Values</th><th>Description</th><th>Default</th></tr>
+</thead>
+<tbody>
+<tr><td><code>druid.realtime.cache.useCache</code></td><td>true, false</td><td>Enable the cache on the realtime.</td><td>false</td></tr>
+<tr><td><code>druid.realtime.cache.populateCache</code></td><td>true, false</td><td>Populate the cache on the realtime.</td><td>false</td></tr>
+<tr><td><code>druid.realtime.cache.unCacheable</code></td><td>All druid query types</td><td>All query types to not cache.</td><td><code>[]</code></td></tr>
+<tr><td><code>druid.realtime.cache.maxEntrySize</code></td><td>positive integer</td><td>Maximum cache entry size in bytes.</td><td>1_000_000</td></tr>
+</tbody>
+</table>
+<p>See <a href="#cache-configuration">cache configuration</a> for how to configure cache settings.</p>
+<h4><a class="anchor" aria-hidden="true" id="additional-peon-configuration"></a><a href="#additional-peon-configuration" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Additional Peon Configuration</h4>
+<p>Although peons inherit the configurations of their parent MiddleManagers, explicit child peon configs in MiddleManager can be set by prefixing them with:</p>
+<pre><code class="hljs">druid.indexer.fork.<span class="hljs-keyword">property</span><span class="hljs-title">
+</span></code></pre>
+<p>Additional peon configs include:</p>
+<table>
+<thead>
+<tr><th>Property</th><th>Description</th><th>Default</th></tr>
+</thead>
+<tbody>
+<tr><td><code>druid.peon.mode</code></td><td>Choices are &quot;local&quot; and &quot;remote&quot;. Setting this to local means you intend to run the peon as a standalone process (Not recommended).</td><td>remote</td></tr>
+<tr><td><code>druid.indexer.task.baseDir</code></td><td>Base temporary working directory.</td><td><code>System.getProperty(&quot;java.io.tmpdir&quot;)</code></td></tr>
+<tr><td><code>druid.indexer.task.baseTaskDir</code></td><td>Base temporary working directory for tasks.</td><td><code>${druid.indexer.task.baseDir}/persistent/task</code></td></tr>
+<tr><td><code>druid.indexer.task.defaultHadoopCoordinates</code></td><td>Hadoop version to use with HadoopIndexTasks that do not request a particular version.</td><td>org.apache.hadoop:hadoop-client:2.8.5</td></tr>
+<tr><td><code>druid.indexer.task.defaultRowFlushBoundary</code></td><td>Highest row count before persisting to disk. Used for indexing generating tasks.</td><td>75000</td></tr>
+<tr><td><code>druid.indexer.task.directoryLockTimeout</code></td><td>Wait this long for zombie peons to exit before giving up on their replacements.</td><td>PT10M</td></tr>
+<tr><td><code>druid.indexer.task.gracefulShutdownTimeout</code></td><td>Wait this long on middleManager restart for restorable tasks to gracefully exit.</td><td>PT5M</td></tr>
+<tr><td><code>druid.indexer.task.hadoopWorkingPath</code></td><td>Temporary working directory for Hadoop tasks.</td><td><code>/tmp/druid-indexing</code></td></tr>
+<tr><td><code>druid.indexer.task.restoreTasksOnRestart</code></td><td>If true, MiddleManagers will attempt to stop tasks gracefully on shutdown and restore them on restart.</td><td>false</td></tr>
+<tr><td><code>druid.indexer.server.maxChatRequests</code></td><td>Maximum number of concurrent requests served by a task's chat handler. Set to 0 to disable limiting.</td><td>0</td></tr>
+</tbody>
+</table>
+<p>If the peon is running in remote mode, there must be an Overlord up and running. Peons in remote mode can set the following configurations:</p>
+<table>
+<thead>
+<tr><th>Property</th><th>Description</th><th>Default</th></tr>
+</thead>
+<tbody>
+<tr><td><code>druid.peon.taskActionClient.retry.minWait</code></td><td>The minimum retry time to communicate with Overlord.</td><td>PT5S</td></tr>
+<tr><td><code>druid.peon.taskActionClient.retry.maxWait</code></td><td>The maximum retry time to communicate with Overlord.</td><td>PT1M</td></tr>
+<tr><td><code>druid.peon.taskActionClient.retry.maxRetryCount</code></td><td>The maximum number of retries to communicate with Overlord.</td><td>60</td></tr>
+</tbody>
+</table>
+<h5><a class="anchor" aria-hidden="true" id="segmentwriteoutmediumfactory"></a><a href="#segmentwriteoutmediumfactory" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>SegmentWriteOutMediumFactory</h5>
+<p>When new segments are created, Druid temporarily stores some preprocessed data in some buffers. Currently three types of
+<em>medium</em> exist for those buffers: <em>temporary files</em>, <em>off-heap memory</em>, and <em>on-heap memory</em>.</p>
+<p><em>Temporary files</em> (<code>tmpFile</code>) are stored under the task working directory (see <code>druid.indexer.task.baseTaskDir</code>
+configuration above) and thus share it's mounting properties, e. g. they could be backed by HDD, SSD or memory (tmpfs).
+This type of medium may do unnecessary disk I/O and requires some disk space to be available.</p>
+<p><em>Off-heap memory medium</em> (<code>offHeapMemory</code>) creates buffers in off-heap memory of a JVM process that is running a task.
+This type of medium is preferred, but it may require to allow the JVM to have more off-heap memory, by changing
+<code>-XX:MaxDirectMemorySize</code> configuration. It is not yet understood how does the required off-heap memory size relates
+to the size of the segments being created. But definitely it doesn't make sense to add more extra off-heap memory,
+than the configured maximum <em>heap</em> size (<code>-Xmx</code>) for the same JVM.</p>
+<p><em>On-heap memory medium</em> (<code>onHeapMemory</code>) creates buffers using the allocated heap memory of the JVM process running a task.
+Using on-heap memory introduces garbage collection overhead and so is not recommended in most cases. This type of medium is
+most helpful for tasks run on external clusters where it may be difficult to allocate and work with direct memory
+effectively.</p>
+<p>For most types of tasks SegmentWriteOutMediumFactory could be configured per-task (see <a href="/docs/0.20.0/ingestion/tasks.html">Tasks</a>
+page, &quot;TuningConfig&quot; section), but if it's not specified for a task, or it's not supported for a particular task type,
+then the value from the configuration below is used:</p>
+<table>
+<thead>
+<tr><th>Property</th><th>Description</th><th>Default</th></tr>
+</thead>
+<tbody>
+<tr><td><code>druid.peon.defaultSegmentWriteOutMediumFactory.type</code></td><td><code>tmpFile</code>, <code>offHeapMemory</code>, or <code>onHeapMemory</code>, see explanation above</td><td><code>tmpFile</code></td></tr>
+</tbody>
+</table>
+<h3><a class="anchor" aria-hidden="true" id="indexer"></a><a href="#indexer" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Indexer</h3>
+<h4><a class="anchor" aria-hidden="true" id="indexer-process-configuration"></a><a href="#indexer-process-configuration" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Indexer Process Configuration</h4>
+<table>
+<thead>
+<tr><th>Property</th><th>Description</th><th>Default</th></tr>
+</thead>
+<tbody>
+<tr><td><code>druid.host</code></td><td>The host for the current process. This is used to advertise the current processes location as reachable from another process and should generally be specified such that <code>http://${druid.host}/</code> could actually talk to this process</td><td>InetAddress.getLocalHost().getCanonicalHostName()</td></tr>
+<tr><td><code>druid.bindOnHost</code></td><td>Indicating whether the process's internal jetty server bind on <code>druid.host</code>. Default is false, which means binding to all interfaces.</td><td>false</td></tr>
+<tr><td><code>druid.plaintextPort</code></td><td>This is the port to actually listen on; unless port mapping is used, this will be the same port as is on <code>druid.host</code></td><td>8091</td></tr>
+<tr><td><code>druid.tlsPort</code></td><td>TLS port for HTTPS connector, if <a href="/docs/0.20.0/operations/tls-support.html">druid.enableTlsPort</a> is set then this config will be used. If <code>druid.host</code> contains port then that port will be ignored. This should be a non-negative Integer.</td><td>8283</td></tr>
+<tr><td><code>druid.service</code></td><td>The name of the service. This is used as a dimension when emitting metrics and alerts to differentiate between the various services</td><td>druid/indexer</td></tr>
+</tbody>
+</table>
+<h4><a class="anchor" aria-hidden="true" id="indexer-general-configuration"></a><a href="#indexer-general-configuration" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Indexer General Configuration</h4>
+<table>
+<thead>
+<tr><th>Property</th><th>Description</th><th>Default</th></tr>
+</thead>
+<tbody>
+<tr><td><code>druid.worker.version</code></td><td>Version identifier for the Indexer.</td><td>0</td></tr>
+<tr><td><code>druid.worker.capacity</code></td><td>Maximum number of tasks the Indexer can accept.</td><td>Number of available processors - 1</td></tr>
+<tr><td><code>druid.worker.globalIngestionHeapLimitBytes</code></td><td>Total amount of heap available for ingestion processing. This is applied by automatically setting the <code>maxBytesInMemory</code> property on tasks.</td><td>60% of configured JVM heap</td></tr>
+<tr><td><code>druid.worker.numConcurrentMerges</code></td><td>Maximum number of segment persist or merge operations that can run concurrently across all tasks.</td><td><code>druid.worker.capacity</code> / 2, rounded down</td></tr>
+<tr><td><code>druid.indexer.task.baseDir</code></td><td>Base temporary working directory.</td><td><code>System.getProperty(&quot;java.io.tmpdir&quot;)</code></td></tr>
+<tr><td><code>druid.indexer.task.baseTaskDir</code></td><td>Base temporary working directory for tasks.</td><td><code>${druid.indexer.task.baseDir}/persistent/tasks</code></td></tr>
+<tr><td><code>druid.indexer.task.defaultHadoopCoordinates</code></td><td>Hadoop version to use with HadoopIndexTasks that do not request a particular version.</td><td>org.apache.hadoop:hadoop-client:2.8.5</td></tr>
+<tr><td><code>druid.indexer.task.gracefulShutdownTimeout</code></td><td>Wait this long on Indexer restart for restorable tasks to gracefully exit.</td><td>PT5M</td></tr>
+<tr><td><code>druid.indexer.task.hadoopWorkingPath</code></td><td>Temporary working directory for Hadoop tasks.</td><td><code>/tmp/druid-indexing</code></td></tr>
+<tr><td><code>druid.indexer.task.restoreTasksOnRestart</code></td><td>If true, the Indexer will attempt to stop tasks gracefully on shutdown and restore them on restart.</td><td>false</td></tr>
+<tr><td><code>druid.peon.taskActionClient.retry.minWait</code></td><td>The minimum retry time to communicate with Overlord.</td><td>PT5S</td></tr>
+<tr><td><code>druid.peon.taskActionClient.retry.maxWait</code></td><td>The maximum retry time to communicate with Overlord.</td><td>PT1M</td></tr>
+<tr><td><code>druid.peon.taskActionClient.retry.maxRetryCount</code></td><td>The maximum number of retries to communicate with Overlord.</td><td>60</td></tr>
+</tbody>
+</table>
+<h4><a class="anchor" aria-hidden="true" id="indexer-concurrent-requests"></a><a href="#indexer-concurrent-requests" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Indexer Concurrent Requests</h4>
+<p>Druid uses Jetty to serve HTTP requests.</p>
+<table>
+<thead>
+<tr><th>Property</th><th>Description</th><th>Default</th></tr>
+</thead>
+<tbody>
+<tr><td><code>druid.server.http.numThreads</code></td><td>Number of threads for HTTP requests. Please see the <a href="../design/indexer.html#server-http-threads">Indexer Server HTTP threads</a> documentation for more details on how the Indexer uses this configuration.</td><td>max(10, (Number of cores * 17) / 16 + 2) + 30</td></tr>
+<tr><td><code>druid.server.http.queueSize</code></td><td>Size of the worker queue used by Jetty server to temporarily store incoming client connections. If this value is set and a request is rejected by jetty because queue is full then client would observe request failure with TCP connection being closed immediately with a completely empty response from server.</td><td>Unbounded</td></tr>
+<tr><td><code>druid.server.http.maxIdleTime</code></td><td>The Jetty max idle time for a connection.</td><td>PT5M</td></tr>
+<tr><td><code>druid.server.http.enableRequestLimit</code></td><td>If enabled, no requests would be queued in jetty queue and &quot;HTTP 429 Too Many Requests&quot; error response would be sent.</td><td>false</td></tr>
+<tr><td><code>druid.server.http.defaultQueryTimeout</code></td><td>Query timeout in millis, beyond which unfinished queries will be cancelled</td><td>300000</td></tr>
+<tr><td><code>druid.server.http.gracefulShutdownTimeout</code></td><td>The maximum amount of time Jetty waits after receiving shutdown signal. After this timeout the threads will be forcefully shutdown. This allows any queries that are executing to complete.</td><td><code>PT0S</code> (do not wait)</td></tr>
+<tr><td><code>druid.server.http.unannouncePropagationDelay</code></td><td>How long to wait for zookeeper unannouncements to propagate before shutting down Jetty. This is a minimum and <code>druid.server.http.gracefulShutdownTimeout</code> does not start counting down until after this period elapses.</td><td><code>PT0S</code> (do not wait)</td></tr>
+<tr><td><code>druid.server.http.maxQueryTimeout</code></td><td>Maximum allowed value (in milliseconds) for <code>timeout</code> parameter. See <a href="../querying/query-context.html">query-context</a> to know more about <code>timeout</code>. Query is rejected if the query context <code>timeout</code> is greater than this value.</td><td>Long.MAX_VALUE</td></tr>
+<tr><td><code>druid.server.http.maxRequestHeaderSize</code></td><td>Maximum size of a request header in bytes. Larger headers consume more memory and can make a server more vulnerable to denial of service attacks.</td><td>8 * 1024</td></tr>
+<tr><td><code>druid.server.http.enableForwardedRequestCustomizer</code></td><td>If enabled, adds Jetty ForwardedRequestCustomizer which reads X-Forwarded-* request headers to manipulate servlet request object when Druid is used behind a proxy.</td><td>false</td></tr>
+<tr><td><code>druid.server.http.allowedHttpMethods</code></td><td>List of HTTP methods that should be allowed in addition to the ones required by Druid APIs. Druid APIs require GET, PUT, POST, and DELETE, which are always allowed. This option is not useful unless you have installed an extension that needs these additional HTTP methods or that adds functionality related to CORS. None of Druid's bundled extensions require these methods.</td><td>[]</td></tr>
+</tbody>
+</table>
+<h4><a class="anchor" aria-hidden="true" id="indexer-processing-resources"></a><a href="#indexer-processing-resources" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Indexer Processing Resources</h4>
+<table>
+<thead>
+<tr><th>Property</th><th>Description</th><th>Default</th></tr>
+</thead>
+<tbody>
+<tr><td><code>druid.processing.buffer.sizeBytes</code></td><td>This specifies a buffer size for the storage of intermediate results. The computation engine in the Indexer processes will use a scratch buffer of this size to do all of their intermediate computations off-heap. Larger values allow for more aggregations in a single pass over the data while smaller values can require more passes depending on the query that is being executed.</td><td>auto (max 1GB)</td></tr>
+<tr><td><code>druid.processing.buffer.poolCacheMaxCount</code></td><td>processing buffer pool caches the buffers for later use, this is the maximum count cache will grow to. note that pool can create more buffers than it can cache if necessary.</td><td>Integer.MAX_VALUE</td></tr>
+<tr><td><code>druid.processing.formatString</code></td><td>Indexer processes use this format string to name their processing threads.</td><td>processing-%s</td></tr>
+<tr><td><code>druid.processing.numMergeBuffers</code></td><td>The number of direct memory buffers available for merging query results. The buffers are sized by <code>druid.processing.buffer.sizeBytes</code>. This property is effectively a concurrency limit for queries that require merging buffers. If you are using any queries that require merge buffers (currently, just groupBy v2) then you should have at least two of these.</td><td><code>max(2, druid.processing.numThreads / 4)</code></td></tr>
+<tr><td><code>druid.processing.numThreads</code></td><td>The number of processing threads to have available for parallel processing of segments. Our rule of thumb is <code>num_cores - 1</code>, which means that even under heavy load there will still be one core available to do background tasks like talking with ZooKeeper and pulling down segments. If only one core is available, this property defaults to the value <code>1</code>.</td><td>Number of cores - 1 (or 1)</td></tr>
+<tr><td><code>druid.processing.columnCache.sizeBytes</code></td><td>Maximum size in bytes for the dimension value lookup cache. Any value greater than <code>0</code> enables the cache. It is currently disabled by default. Enabling the lookup cache can significantly improve the performance of aggregators operating on dimension values, such as the JavaScript aggregator, or cardinality aggregator, but can slow things down if the cache hit rate is low (i.e. dimensions with few repeating values). Enabling it may also require additional garbage collection tuning to avoid long GC pauses.</td><td><code>0</code> (disabled)</td></tr>
+<tr><td><code>druid.processing.fifo</code></td><td>If the processing queue should treat tasks of equal priority in a FIFO manner</td><td><code>false</code></td></tr>
+<tr><td><code>druid.processing.tmpDir</code></td><td>Path where temporary files created while processing a query should be stored. If specified, this configuration takes priority over the default <code>java.io.tmpdir</code> path.</td><td>path represented by <code>java.io.tmpdir</code></td></tr>
+</tbody>
+</table>
+<p>The amount of direct memory needed by Druid is at least
+<code>druid.processing.buffer.sizeBytes * (druid.processing.numMergeBuffers + druid.processing.numThreads + 1)</code>. You can
+ensure at least this amount of direct memory is available by providing <code>-XX:MaxDirectMemorySize=&lt;VALUE&gt;</code> at the command
+line.</p>
+<h4><a class="anchor" aria-hidden="true" id="query-configurations"></a><a href="#query-configurations" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Query Configurations</h4>
+<p>See <a href="#general-query-configuration">general query configuration</a>.</p>
+<h4><a class="anchor" aria-hidden="true" id="indexer-caching"></a><a href="#indexer-caching" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Indexer Caching</h4>
+<p>You can optionally configure caching to be enabled on the Indexer by setting caching configs here.</p>
+<table>
+<thead>
+<tr><th>Property</th><th>Possible Values</th><th>Description</th><th>Default</th></tr>
+</thead>
+<tbody>
+<tr><td><code>druid.realtime.cache.useCache</code></td><td>true, false</td><td>Enable the cache on the realtime.</td><td>false</td></tr>
+<tr><td><code>druid.realtime.cache.populateCache</code></td><td>true, false</td><td>Populate the cache on the realtime.</td><td>false</td></tr>
+<tr><td><code>druid.realtime.cache.unCacheable</code></td><td>All druid query types</td><td>All query types to not cache.</td><td><code>[]</code></td></tr>
+<tr><td><code>druid.realtime.cache.maxEntrySize</code></td><td>positive integer</td><td>Maximum cache entry size in bytes.</td><td>1_000_000</td></tr>
+</tbody>
+</table>
+<p>See <a href="#cache-configuration">cache configuration</a> for how to configure cache settings.</p>
+<p>Note that only local caches such as the <code>local</code>-type cache and <code>caffeine</code> cache are supported. If a remote cache such as <code>memcached</code> is used, it will be ignored.</p>
+<h3><a class="anchor" aria-hidden="true" id="historical"></a><a href="#historical" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Historical</h3>
+<p>For general Historical Process information, see <a href="/docs/0.20.0/design/historical.html">here</a>.</p>
+<p>These Historical configurations can be defined in the <code>historical/runtime.properties</code> file.</p>
+<h4><a class="anchor" aria-hidden="true" id="historical-process-configuration"></a><a href="#historical-process-configuration" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Historical Process Configuration</h4>
+<table>
+<thead>
+<tr><th>Property</th><th>Description</th><th>Default</th></tr>
+</thead>
+<tbody>
+<tr><td><code>druid.host</code></td><td>The host for the current process. This is used to advertise the current processes location as reachable from another process and should generally be specified such that <code>http://${druid.host}/</code> could actually talk to this process</td><td>InetAddress.getLocalHost().getCanonicalHostName()</td></tr>
+<tr><td><code>druid.bindOnHost</code></td><td>Indicating whether the process's internal jetty server bind on <code>druid.host</code>. Default is false, which means binding to all interfaces.</td><td>false</td></tr>
+<tr><td><code>druid.plaintextPort</code></td><td>This is the port to actually listen on; unless port mapping is used, this will be the same port as is on <code>druid.host</code></td><td>8083</td></tr>
+<tr><td><code>druid.tlsPort</code></td><td>TLS port for HTTPS connector, if <a href="/docs/0.20.0/operations/tls-support.html">druid.enableTlsPort</a> is set then this config will be used. If <code>druid.host</code> contains port then that port will be ignored. This should be a non-negative Integer.</td><td>8283</td></tr>
+<tr><td><code>druid.service</code></td><td>The name of the service. This is used as a dimension when emitting metrics and alerts to differentiate between the various services</td><td>druid/historical</td></tr>
+</tbody>
+</table>
+<h4><a class="anchor" aria-hidden="true" id="historical-general-configuration"></a><a href="#historical-general-configuration" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Historical General Configuration</h4>
+<table>
+<thead>
+<tr><th>Property</th><th>Description</th><th>Default</th></tr>
+</thead>
+<tbody>
+<tr><td><code>druid.server.maxSize</code></td><td>The maximum number of bytes-worth of segments that the process wants assigned to it. The Coordinator process will attempt to assign segments to a Historical process only if this property is greater than the total size of segments served by it. Since this property defines the upper limit on the total segment size that can be assigned to a Historical, it is defaulted to the sum of all <code>maxSize</code> values specified within <code>druid.segmentCache.locations</code> property. Human-readable format is supported, see <a href="/docs/0.20.0/configuration/human-readable-byte.html">here</a>.</td><td>Sum of <code>maxSize</code> values defined within <code>druid.segmentCache.locations</code></td></tr>
+<tr><td><code>druid.server.tier</code></td><td>A string to name the distribution tier that the storage process belongs to. Many of the <a href="/docs/0.20.0/operations/rule-configuration.html">rules Coordinator processes use</a> to manage segments can be keyed on tiers.</td><td><code>_default_tier</code></td></tr>
+<tr><td><code>druid.server.priority</code></td><td>In a tiered architecture, the priority of the tier, thus allowing control over which processes are queried. Higher numbers mean higher priority. The default (no priority) works for architecture with no cross replication (tiers that have no data-storage overlap). Data centers typically have equal priority.</td><td>0</td></tr>
+</tbody>
+</table>
+<h4><a class="anchor" aria-hidden="true" id="storing-segments"></a><a href="#storing-segments" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Storing Segments</h4>
+<table>
+<thead>
+<tr><th>Property</th><th>Description</th><th>Default</th></tr>
+</thead>
+<tbody>
+<tr><td><code>druid.segmentCache.locations</code></td><td>Segments assigned to a Historical process are first stored on the local file system (in a disk cache) and then served by the Historical process. These locations define where that local cache resides. This value cannot be NULL or EMPTY. Here is an example <code>druid.segmentCache.locations=[{&quot;path&quot;: &quot;/mnt/druidSegments&quot;, &quot;maxSize&quot;: &quot;10k&quot;, &quot;freeSpacePercent&quot;: 1.0}]</code>. &quot;freeSpacePercent&quot; is optional, if provided then enforces that much of free disk partition space while storing segments. But, it depends on File.getTotalSpace() and File.getFreeSpace() methods, so enable if only if they work for your File System.</td><td>none</td></tr>
+<tr><td><code>druid.segmentCache.locationSelectorStrategy</code></td><td>The strategy used to select a location from the configured <code>druid.segmentCache.locations</code> for segment distribution. Possible values are <code>leastBytesUsed</code>, <code>roundRobin</code>, <code>random</code>, or <code>mostAvailableSize</code>.</td><td>leastBytesUsed</td></tr>
+<tr><td><code>druid.segmentCache.deleteOnRemove</code></td><td>Delete segment files from cache once a process is no longer serving a segment.</td><td>true</td></tr>
+<tr><td><code>druid.segmentCache.dropSegmentDelayMillis</code></td><td>How long a process delays before completely dropping segment.</td><td>30000 (30 seconds)</td></tr>
+<tr><td><code>druid.segmentCache.infoDir</code></td><td>Historical processes keep track of the segments they are serving so that when the process is restarted they can reload the same segments without waiting for the Coordinator to reassign. This path defines where this metadata is kept. Directory will be created if needed.</td><td>${first_location}/info_dir</td></tr>
+<tr><td><code>druid.segmentCache.announceIntervalMillis</code></td><td>How frequently to announce segments while segments are loading from cache. Set this value to zero to wait for all segments to be loaded before announcing.</td><td>5000 (5 seconds)</td></tr>
+<tr><td><code>druid.segmentCache.numLoadingThreads</code></td><td>How many segments to drop or load concurrently from deep storage. Note that the work of loading segments involves downloading segments from deep storage, decompressing them and loading them to a memory mapped location. So the work is not all I/O Bound. Depending on CPU and network load, one could possibly increase this config to a higher value.</td><td>max(1,Number of cores / 6)</td></tr>
+<tr><td><code>druid.segmentCache.numBootstrapThreads</code></td><td>How many segments to load concurrently during historical startup.</td><td><code>druid.segmentCache.numLoadingThreads</code></td></tr>
+<tr><td><code>druid.segmentCache.lazyLoadOnStart</code></td><td>Whether or not to load segment columns metadata lazily during historical startup. When set to true, Historical startup time will be dramatically improved by deferring segment loading until the first time that segment takes part in a query, which will incur this cost instead. One catch is that if historical crashes while in the process of downloading and creating segment files, it is possible to end up with a corrupted segment on disk, this requires manual intervention to delete corrupted files. When the flag is set to true, historical startup would complete successfully and queries using this segment would fail at runtime.</td><td>false</td></tr>
+<tr><td><code>druid.coordinator.loadqueuepeon.curator.numCallbackThreads</code></td><td>Number of threads for executing callback actions associated with loading or dropping of segments. One might want to increase this number when noticing clusters are lagging behind w.r.t. balancing segments across historical nodes.</td><td>2</td></tr>
+</tbody>
+</table>
+<p>In <code>druid.segmentCache.locations</code>, <em>freeSpacePercent</em> was added because <em>maxSize</em> setting is only a theoretical limit and assumes that much space will always be available for storing segments. In case of any druid bug leading to unaccounted segment files left alone on disk or some other process writing stuff to disk, This check can start failing segment loading early before filling up the disk completely and leaving the host usable otherwise.</p>
+<p>In <code>druid.segmentCache.locationSelectorStrategy</code>, one of leastBytesUsed, roundRobin, random, or mostAvailableSize could be specified to represent the strategy to distribute segments across multiple segment cache locations.</p>
+<table>
+<thead>
+<tr><th>Strategy</th><th>Description</th></tr>
+</thead>
+<tbody>
+<tr><td><code>leastBytesUsed</code></td><td>selects a location which has least bytes used in absolute terms.</td></tr>
+<tr><td><code>roundRobin</code></td><td>selects a location in a round robin fashion oblivious to the bytes used or the capacity.</td></tr>
+<tr><td><code>random</code></td><td>selects a segment cache location randomly each time among the available storage locations.</td></tr>
+<tr><td><code>mostAvailableSize</code></td><td>selects a segment cache location that has most free space among the available storage locations.</td></tr>
+</tbody>
+</table>
+<p>Note that if <code>druid.segmentCache.numLoadingThreads</code> &gt; 1, multiple threads can download different segments at the same time. In this case, with the leastBytesUsed strategy or mostAvailableSize strategy, historicals may select a sub-optimal storage location because each decision is based on a snapshot of the storage location status of when a segment is requested to download.</p>
+<h4><a class="anchor" aria-hidden="true" id="historical-query-configs"></a><a href="#historical-query-configs" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Historical query configs</h4>
+<h5><a class="anchor" aria-hidden="true" id="concurrent-requests"></a><a href="#concurrent-requests" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Concurrent Requests</h5>
+<p>Druid uses Jetty to serve HTTP requests.</p>
+<table>
+<thead>
+<tr><th>Property</th><th>Description</th><th>Default</th></tr>
+</thead>
+<tbody>
+<tr><td><code>druid.server.http.numThreads</code></td><td>Number of threads for HTTP requests.</td><td>max(10, (Number of cores * 17) / 16 + 2) + 30</td></tr>
+<tr><td><code>druid.server.http.queueSize</code></td><td>Size of the worker queue used by Jetty server to temporarily store incoming client connections. If this value is set and a request is rejected by jetty because queue is full then client would observe request failure with TCP connection being closed immediately with a completely empty response from server.</td><td>Unbounded</td></tr>
+<tr><td><code>druid.server.http.maxIdleTime</code></td><td>The Jetty max idle time for a connection.</td><td>PT5M</td></tr>
+<tr><td><code>druid.server.http.enableRequestLimit</code></td><td>If enabled, no requests would be queued in jetty queue and &quot;HTTP 429 Too Many Requests&quot; error response would be sent.</td><td>false</td></tr>
+<tr><td><code>druid.server.http.defaultQueryTimeout</code></td><td>Query timeout in millis, beyond which unfinished queries will be cancelled</td><td>300000</td></tr>
+<tr><td><code>druid.server.http.gracefulShutdownTimeout</code></td><td>The maximum amount of time Jetty waits after receiving shutdown signal. After this timeout the threads will be forcefully shutdown. This allows any queries that are executing to complete.</td><td><code>PT0S</code> (do not wait)</td></tr>
+<tr><td><code>druid.server.http.unannouncePropagationDelay</code></td><td>How long to wait for zookeeper unannouncements to propagate before shutting down Jetty. This is a minimum and <code>druid.server.http.gracefulShutdownTimeout</code> does not start counting down until after this period elapses.</td><td><code>PT0S</code> (do not wait)</td></tr>
+<tr><td><code>druid.server.http.maxQueryTimeout</code></td><td>Maximum allowed value (in milliseconds) for <code>timeout</code> parameter. See <a href="/docs/0.20.0/querying/query-context.html">query-context</a> to know more about <code>timeout</code>. Query is rejected if the query context <code>timeout</code> is greater than this value.</td><td>Long.MAX_VALUE</td></tr>
+<tr><td><code>druid.server.http.maxRequestHeaderSize</code></td><td>Maximum size of a request header in bytes. Larger headers consume more memory and can make a server more vulnerable to denial of service attacks.</td><td>8 * 1024</td></tr>
+</tbody>
+</table>
+<h5><a class="anchor" aria-hidden="true" id="processing"></a><a href="#processing" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Processing</h5>
+<table>
+<thead>
+<tr><th>Property</th><th>Description</th><th>Default</th></tr>
+</thead>
+<tbody>
+<tr><td><code>druid.processing.buffer.sizeBytes</code></td><td>This specifies a buffer size for the storage of intermediate results. The computation engine in both the Historical and Realtime processes will use a scratch buffer of this size to do all of their intermediate computations off-heap. Larger values allow for more aggregations in a single pass over the data while smaller values can require more passes depending on the query that is being executed.</td><td>auto (max 1GB)</td></tr>
+<tr><td><code>druid.processing.buffer.poolCacheMaxCount</code></td><td>processing buffer pool caches the buffers for later use, this is the maximum count cache will grow to. note that pool can create more buffers than it can cache if necessary.</td><td>Integer.MAX_VALUE</td></tr>
+<tr><td><code>druid.processing.formatString</code></td><td>Realtime and Historical processes use this format string to name their processing threads.</td><td>processing-%s</td></tr>
+<tr><td><code>druid.processing.numMergeBuffers</code></td><td>The number of direct memory buffers available for merging query results. The buffers are sized by <code>druid.processing.buffer.sizeBytes</code>. This property is effectively a concurrency limit for queries that require merging buffers. If you are using any queries that require merge buffers (currently, just groupBy v2) then you should have at least two of these.</td><td><code>max(2, druid.processing.numThreads / 4)</code></td></tr>
+<tr><td><code>druid.processing.numThreads</code></td><td>The number of processing threads to have available for parallel processing of segments. Our rule of thumb is <code>num_cores - 1</code>, which means that even under heavy load there will still be one core available to do background tasks like talking with ZooKeeper and pulling down segments. If only one core is available, this property defaults to the value <code>1</code>.</td><td>Number of cores - 1 (or 1)</td></tr>
+<tr><td><code>druid.processing.columnCache.sizeBytes</code></td><td>Maximum size in bytes for the dimension value lookup cache. Any value greater than <code>0</code> enables the cache. It is currently disabled by default. Enabling the lookup cache can significantly improve the performance of aggregators operating on dimension values, such as the JavaScript aggregator, or cardinality aggregator, but can slow things down if the cache hit rate is low (i.e. dimensions with few repeating values). Enabling it may also require additional garbage collection tuning to avoid long GC pauses.</td><td><code>0</code> (disabled)</td></tr>
+<tr><td><code>druid.processing.fifo</code></td><td>If the processing queue should treat tasks of equal priority in a FIFO manner</td><td><code>false</code></td></tr>
+<tr><td><code>druid.processing.tmpDir</code></td><td>Path where temporary files created while processing a query should be stored. If specified, this configuration takes priority over the default <code>java.io.tmpdir</code> path.</td><td>path represented by <code>java.io.tmpdir</code></td></tr>
+</tbody>
+</table>
+<p>The amount of direct memory needed by Druid is at least
+<code>druid.processing.buffer.sizeBytes * (druid.processing.numMergeBuffers + druid.processing.numThreads + 1)</code>. You can
+ensure at least this amount of direct memory is available by providing <code>-XX:MaxDirectMemorySize=&lt;VALUE&gt;</code> at the command
+line.</p>
+<h5><a class="anchor" aria-hidden="true" id="historical-query-configuration"></a><a href="#historical-query-configuration" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Historical query configuration</h5>
+<p>See <a href="#general-query-configuration">general query configuration</a>.</p>
+<h4><a class="anchor" aria-hidden="true" id="historical-caching"></a><a href="#historical-caching" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Historical Caching</h4>
+<p>You can optionally only configure caching to be enabled on the Historical by setting caching configs here.</p>
+<table>
+<thead>
+<tr><th>Property</th><th>Possible Values</th><th>Description</th><th>Default</th></tr>
+</thead>
+<tbody>
+<tr><td><code>druid.historical.cache.useCache</code></td><td>true, false</td><td>Enable the cache on the Historical.</td><td>false</td></tr>
+<tr><td><code>druid.historical.cache.populateCache</code></td><td>true, false</td><td>Populate the cache on the Historical.</td><td>false</td></tr>
+<tr><td><code>druid.historical.cache.unCacheable</code></td><td>All druid query types</td><td>All query types to not cache.</td><td><code>[]</code></td></tr>
+<tr><td><code>druid.historical.cache.maxEntrySize</code></td><td>Maximum cache entry size in bytes.</td><td>1_000_000</td></tr>
+</tbody>
+</table>
+<p>See <a href="#cache-configuration">cache configuration</a> for how to configure cache settings.</p>
+<h2><a class="anchor" aria-hidden="true" id="query-server"></a><a href="#query-server" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Query Server</h2>
+<p>This section contains the configuration options for the processes that reside on Query servers (Brokers) in the suggested <a href="../design/processes.html#server-types">three-server configuration</a>.</p>
+<p>Configuration options for the experimental <a href="/docs/0.20.0/design/router.html">Router process</a> are also provided here.</p>
+<h3><a class="anchor" aria-hidden="true" id="broker"></a><a href="#broker" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Broker</h3>
+<p>For general Broker process information, see <a href="/docs/0.20.0/design/broker.html">here</a>.</p>
+<p>These Broker configurations can be defined in the <code>broker/runtime.properties</code> file.</p>
+<h4><a class="anchor" aria-hidden="true" id="broker-process-configs"></a><a href="#broker-process-configs" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Broker Process Configs</h4>
+<table>
+<thead>
+<tr><th>Property</th><th>Description</th><th>Default</th></tr>
+</thead>
+<tbody>
+<tr><td><code>druid.host</code></td><td>The host for the current process. This is used to advertise the current processes location as reachable from another process and should generally be specified such that <code>http://${druid.host}/</code> could actually talk to this process</td><td>InetAddress.getLocalHost().getCanonicalHostName()</td></tr>
+<tr><td><code>druid.bindOnHost</code></td><td>Indicating whether the process's internal jetty server bind on <code>druid.host</code>. Default is false, which means binding to all interfaces.</td><td>false</td></tr>
+<tr><td><code>druid.plaintextPort</code></td><td>This is the port to actually listen on; unless port mapping is used, this will be the same port as is on <code>druid.host</code></td><td>8082</td></tr>
+<tr><td><code>druid.tlsPort</code></td><td>TLS port for HTTPS connector, if <a href="/docs/0.20.0/operations/tls-support.html">druid.enableTlsPort</a> is set then this config will be used. If <code>druid.host</code> contains port then that port will be ignored. This should be a non-negative Integer.</td><td>8282</td></tr>
+<tr><td><code>druid.service</code></td><td>The name of the service. This is used as a dimension when emitting metrics and alerts to differentiate between the various services</td><td>druid/broker</td></tr>
+</tbody>
+</table>
+<h4><a class="anchor" aria-hidden="true" id="query-configuration"></a><a href="#query-configuration" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Query configuration</h4>
+<h5><a class="anchor" aria-hidden="true" id="query-routing"></a><a href="#query-routing" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Query routing</h5>
+<table>
+<thead>
+<tr><th>Property</th><th>Possible Values</th><th>Description</th><th>Default</th></tr>
+</thead>
+<tbody>
+<tr><td><code>druid.broker.balancer.type</code></td><td><code>random</code>, <code>connectionCount</code></td><td>Determines how the broker balances connections to Historical processes. <code>random</code> choose randomly, <code>connectionCount</code> picks the process with the fewest number of active connections to</td><td><code>random</code></td></tr>
+<tr><td><code>druid.broker.select.tier</code></td><td><code>highestPriority</code>, <code>lowestPriority</code>, <code>custom</code></td><td>If segments are cross-replicated across tiers in a cluster, you can tell the broker to prefer to select segments in a tier with a certain priority.</td><td><code>highestPriority</code></td></tr>
+<tr><td><code>druid.broker.select.tier.custom.priorities</code></td><td><code>An array of integer priorities.</code> E.g., <code>[-1, 0, 1, 2]</code></td><td>Select servers in tiers with a custom priority list.</td><td>The config only has effect if <code>druid.broker.select.tier</code> is set to <code>custom</code>. If <code>druid.broker.select.tier</code> is set to <code>custom</code> but this config is not specified, the effect is the same as <code>druid.broker.select.tier</code> set to <code>highestPriority</code>. Any of the integers in this config can be ignored if there's no corresponding tiers with such priorities. Tiers with priorities explicitly specified in this config always have higher priority than those not and those not specified fall back to use <code>highestPriority</code> strategy among themselves.</td></tr>
+</tbody>
+</table>
+<h5><a class="anchor" aria-hidden="true" id="query-prioritization-and-laning"></a><a href="#query-prioritization-and-laning" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Query prioritization and laning</h5>
+<p><em>Laning strategies</em> allow you to control capacity utilization for heterogeneous query workloads. With laning, the broker examines and classifies a query for the purpose of assigning it to a 'lane'. Lanes have capacity limits, enforced by the broker, that can be used to ensure sufficient resources are available for other lanes or for interactive queries (with no lane), or to limit overall throughput for queries within the lane. Requests in excess of the capacity are discarded with an HTTP 429 status code.</p>
+<table>
+<thead>
+<tr><th>Property</th><th>Description</th><th>Default</th></tr>
+</thead>
+<tbody>
+<tr><td><code>druid.query.scheduler.numThreads</code></td><td>Maximum number of HTTP threads to dedicate to query processing. To save HTTP thread capacity, this should be lower than <code>druid.server.http.numThreads</code>, but it is worth noting that like <code>druid.server.http.enableRequestLimit</code> is set that query requests over this limit will be denied instead of waiting in the Jetty HTTP request queue.</td><td>Unbounded</td></tr>
+<tr><td><code>druid.query.scheduler.laning.strategy</code></td><td>Query laning strategy to use to assign queries to a lane in order to control capacities for certain classes of queries.</td><td><code>none</code></td></tr>
+<tr><td><code>druid.query.scheduler.prioritization.strategy</code></td><td>Query prioritization strategy to automatically assign priorities.</td><td><code>manual</code></td></tr>
+</tbody>
+</table>
+<h5><a class="anchor" aria-hidden="true" id="prioritization-strategies"></a><a href="#prioritization-strategies" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Prioritization strategies</h5>
+<h6><a class="anchor" aria-hidden="true" id="manual-prioritization-strategy"></a><a href="#manual-prioritization-strategy" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Manual prioritization strategy</h6>
+<p>With this configuration, queries are never assigned a priority automatically, but will preserve a priority manually set on the <a href="/docs/0.20.0/querying/query-context.html">query context</a> with the <code>priority</code> key. This mode can be explicitly set by setting <code>druid.query.scheduler.prioritization.strategy</code> to <code>none</code>.</p>
+<h6><a class="anchor" aria-hidden="true" id="threshold-prioritization-strategy"></a><a href="#threshold-prioritization-strategy" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Threshold prioritization strategy</h6>
+<p>This prioritization strategy lowers the priority of queries that cross any of a configurable set of thresholds, such as how far in the past the data is, how large of an interval a query covers, or the number of segments taking part in a query.</p>
+<p>This strategy can be enabled by setting <code>druid.query.scheduler.prioritization.strategy</code> to <code>threshold</code>.</p>
+<table>
+<thead>
+<tr><th>Property</th><th>Description</th><th>Default</th></tr>
+</thead>
+<tbody>
+<tr><td><code>druid.query.scheduler.prioritization.periodThreshold</code></td><td>ISO duration threshold for how old data can be queried before automatically adjusting query priority.</td><td>None</td></tr>
+<tr><td><code>druid.query.scheduler.prioritization.durationThreshold</code></td><td>ISO duration threshold for maximum duration a queries interval can span before the priority is automatically adjusted.</td><td>None</td></tr>
+<tr><td><code>druid.query.scheduler.prioritization.segmentCountThreshold</code></td><td>Number threshold for maximum number of segments that can take part in a query before its priority is automatically adjusted.</td><td>None</td></tr>
+<tr><td><code>druid.query.scheduler.prioritization.adjustment</code></td><td>Amount to reduce the priority of queries which cross any threshold.</td><td>None</td></tr>
+</tbody>
+</table>
+<h5><a class="anchor" aria-hidden="true" id="laning-strategies"></a><a href="#laning-strategies" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Laning strategies</h5>
+<h6><a class="anchor" aria-hidden="true" id="no-laning-strategy"></a><a href="#no-laning-strategy" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>No laning strategy</h6>
+<p>In this mode, queries are never assigned a lane, and the concurrent query count will only be limited by <code>druid.server.http.numThreads</code> or <code>druid.query.scheduler.numThreads</code>, if set. This is the default Druid query scheduler operating mode. Enable this strategy explicitly by setting <code>druid.query.scheduler.laning.strategy</code> to <code>none</code>.</p>
+<h6><a class="anchor" aria-hidden="true" id="highlow-laning-strategy"></a><a href="#highlow-laning-strategy" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>'High/Low' laning strategy</h6>
+<p>This laning strategy splits queries with a <code>priority</code> below zero into a <code>low</code> query lane, automatically. Queries with priority of zero (the default) or above are considered 'interactive'. The limit on <code>low</code> queries can be set to some desired percentage of the total capacity (or HTTP thread pool size), reserving capacity for interactive queries. Queries in the <code>low</code> lane are <em>not</em> guaranteed their capacity, which may be consumed by interactive queries, but may use up to this limit if total capacity is available.</p>
+<p>If the <code>low</code> lane is specified in the <a href="/docs/0.20.0/querying/query-context.html">query context</a> <code>lane</code> parameter, this will override the computed lane.</p>
+<p>This strategy can be enabled by setting <code>druid.query.scheduler.laning.strategy=hilo</code>.</p>
+<table>
+<thead>
+<tr><th>Property</th><th>Description</th><th>Default</th></tr>
+</thead>
+<tbody>
+<tr><td><code>druid.query.scheduler.laning.maxLowPercent</code></td><td>Maximum percent of the smaller number of <code>druid.server.http.numThreads</code> or <code>druid.query.scheduler.numThreads</code>, defining the number of HTTP threads that can be used by queries with a priority lower than 0. Value must be an integer in the range 1 to 100, and will be rounded up</td><td>No default, must be set if using this mode</td></tr>
+</tbody>
+</table>
+<h6><a class="anchor" aria-hidden="true" id="manual-laning-strategy"></a><a href="#manual-laning-strategy" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>'Manual' laning strategy</h6>
+<p>This laning strategy is best suited for cases where one or more external applications which query Druid are capable of manually deciding what lane a given query should belong to. Configured with a map of lane names to percent or exact max capacities, queries with a matching <code>lane</code> parameter in the <a href="/docs/0.20.0/querying/query-context.html">query context</a> will be subjected to those limits.</p>
+<table>
+<thead>
+<tr><th>Property</th><th>Description</th><th>Default</th></tr>
+</thead>
+<tbody>
+<tr><td><code>druid.query.scheduler.laning.lanes.{name}</code></td><td>Maximum percent or exact limit of queries that can concurrently run in the defined lanes. Any number of lanes may be defined like this. The lane names 'total' and 'default' are reserved for internal use.</td><td>No default, must define at least one lane with a limit above 0. If <code>druid.query.scheduler.laning.isLimitPercent</code> is set to <code>true</code>, values must be integers in the range of 1 to 100.</td></tr>
+<tr><td><code>druid.query.scheduler.laning.isLimitPercent</code></td><td>If set to <code>true</code>, the values set for <code>druid.query.scheduler.laning.lanes</code> will be treated as a percent of the smaller number of <code>druid.server.http.numThreads</code> or <code>druid.query.scheduler.numThreads</code>. Note that in this mode, these lane values across lanes are <em>not</em> required to add up to, and can exceed, 100%.</td><td><code>false</code></td></tr>
+</tbody>
+</table>
+<h5><a class="anchor" aria-hidden="true" id="server-configuration"></a><a href="#server-configuration" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Server Configuration</h5>
+<p>Druid uses Jetty to serve HTTP requests. Each query being processed consumes a single thread from <code>druid.server.http.numThreads</code>, so consider defining <code>druid.query.scheduler.numThreads</code> to a lower value in order to reserve HTTP threads for responding to health checks, lookup loading, and other non-query, and in most cases comparatively very short lived, HTTP requests.</p>
+<table>
+<thead>
+<tr><th>Property</th><th>Description</th><th>Default</th></tr>
+</thead>
+<tbody>
+<tr><td><code>druid.server.http.numThreads</code></td><td>Number of threads for HTTP requests.</td><td>max(10, (Number of cores * 17) / 16 + 2) + 30</td></tr>
+<tr><td><code>druid.server.http.queueSize</code></td><td>Size of the worker queue used by Jetty server to temporarily store incoming client connections. If this value is set and a request is rejected by jetty because queue is full then client would observe request failure with TCP connection being closed immediately with a completely empty response from server.</td><td>Unbounded</td></tr>
+<tr><td><code>druid.server.http.maxIdleTime</code></td><td>The Jetty max idle time for a connection.</td><td>PT5M</td></tr>
+<tr><td><code>druid.server.http.enableRequestLimit</code></td><td>If enabled, no requests would be queued in jetty queue and &quot;HTTP 429 Too Many Requests&quot; error response would be sent.</td><td>false</td></tr>
+<tr><td><code>druid.server.http.defaultQueryTimeout</code></td><td>Query timeout in millis, beyond which unfinished queries will be cancelled</td><td>300000</td></tr>
+<tr><td><code>druid.server.http.maxScatterGatherBytes</code></td><td>Maximum number of bytes gathered from data processes such as Historicals and realtime processes to execute a query. Queries that exceed this limit will fail. This is an advance configuration that allows to protect in case Broker is under heavy load and not utilizing the data gathered in memory fast enough and leading to OOMs. This limit can be further reduced at query time using <code>maxScatterGatherBytes</code> in the context. Note that having large limit is not necessarily bad if broker is never under heavy concurrent load in which case data gathered is processed quickly and freeing up the memory used. Human-readable format is supported, see <a href="/docs/0.20.0/configuration/human-readable-byte.html">here</a>.</td><td>Long.MAX_VALUE</td></tr>
+<tr><td><code>druid.server.http.maxSubqueryRows</code></td><td>Maximum number of rows from subqueries per query. These rows are stored in memory.</td><td>100000</td></tr>
+<tr><td><code>druid.server.http.gracefulShutdownTimeout</code></td><td>The maximum amount of time Jetty waits after receiving shutdown signal. After this timeout the threads will be forcefully shutdown. This allows any queries that are executing to complete.</td><td><code>PT0S</code> (do not wait)</td></tr>
+<tr><td><code>druid.server.http.unannouncePropagationDelay</code></td><td>How long to wait for zookeeper unannouncements to propagate before shutting down Jetty. This is a minimum and <code>druid.server.http.gracefulShutdownTimeout</code> does not start counting down until after this period elapses.</td><td><code>PT0S</code> (do not wait)</td></tr>
+<tr><td><code>druid.server.http.maxQueryTimeout</code></td><td>Maximum allowed value (in milliseconds) for <code>timeout</code> parameter. See <a href="/docs/0.20.0/querying/query-context.html">query-context</a> to know more about <code>timeout</code>. Query is rejected if the query context <code>timeout</code> is greater than this value.</td><td>Long.MAX_VALUE</td></tr>
+<tr><td><code>druid.server.http.maxRequestHeaderSize</code></td><td>Maximum size of a request header in bytes. Larger headers consume more memory and can make a server more vulnerable to denial of service attacks.</td><td>8 * 1024</td></tr>
+</tbody>
+</table>
+<h5><a class="anchor" aria-hidden="true" id="client-configuration"></a><a href="#client-configuration" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Client Configuration</h5>
+<p>Druid Brokers use an HTTP client to communicate with with data servers (Historical servers and real-time tasks). This
+client has the following configuration options.</p>
+<table>
+<thead>
+<tr><th>Property</th><th>Description</th><th>Default</th></tr>
+</thead>
+<tbody>
+<tr><td><code>druid.broker.http.numConnections</code></td><td>Size of connection pool for the Broker to connect to Historical and real-time processes. If there are more queries than this number that all need to speak to the same process, then they will queue up.</td><td><code>20</code></td></tr>
+<tr><td><code>druid.broker.http.compressionCodec</code></td><td>Compression codec the Broker uses to communicate with Historical and real-time processes. May be &quot;gzip&quot; or &quot;identity&quot;.</td><td><code>gzip</code></td></tr>
+<tr><td><code>druid.broker.http.readTimeout</code></td><td>The timeout for data reads from Historical servers and real-time tasks.</td><td><code>PT15M</code></td></tr>
+<tr><td><code>druid.broker.http.unusedConnectionTimeout</code></td><td>The timeout for idle connections in connection pool. The connection in the pool will be closed after this timeout and a new one will be established. This timeout should be less than <code>druid.broker.http.readTimeout</code>. Set this timeout = ~90% of <code>druid.broker.http.readTimeout</code></td><td><code>PT4M</code></td></tr>
+<tr><td><code>druid.broker.http.maxQueuedBytes</code></td><td>Maximum number of bytes queued per query before exerting backpressure on the channel to the data server. Similar to <code>druid.server.http.maxScatterGatherBytes</code>, except unlike that configuration, this one will trigger backpressure rather than query failure. Zero means disabled. Can be overridden by the <a href="/docs/0.20.0/querying/query-context.html">&quot;maxQueuedBytes&quot; query context parameter</a>. Human-readable format is supported, see <a href="/docs/0.20.0/configuration/human-readable-byte.html">here</a>.</td><td><code>0</code> (disabled)</td></tr>
+<tr><td><code>druid.broker.http.numMaxThreads</code></td><td>`Maximum number of I/O worker threads</td><td>max(10, ((number of cores * 17) / 16 + 2) + 30)`</td></tr>
+</tbody>
+</table>
+<h5><a class="anchor" aria-hidden="true" id="retry-policy"></a><a href="#retry-policy" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Retry Policy</h5>
+<p>Druid broker can optionally retry queries internally for transient errors.</p>
+<table>
+<thead>
+<tr><th>Property</th><th>Description</th><th>Default</th></tr>
+</thead>
+<tbody>
+<tr><td><code>druid.broker.retryPolicy.numTries</code></td><td>Number of tries.</td><td>1</td></tr>
+</tbody>
+</table>
+<h5><a class="anchor" aria-hidden="true" id="processing-1"></a><a href="#processing-1" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Processing</h5>
+<p>The broker uses processing configs for nested groupBy queries.</p>
+<table>
+<thead>
+<tr><th>Property</th><th>Description</th><th>Default</th></tr>
+</thead>
+<tbody>
+<tr><td><code>druid.processing.buffer.sizeBytes</code></td><td>This specifies a buffer size for the storage of intermediate results. The computation engine in both the Historical and Realtime processes will use a scratch buffer of this size to do all of their intermediate computations off-heap. Larger values allow for more aggregations in a single pass over the data while smaller values can require more passes depending on the query that is being executed. It can be configured as described in <a href="/docs/0.20.0/configuration/human-readable-byte.html">here</a>.</td><td>auto (max 1GiB)</td></tr>
+<tr><td><code>druid.processing.buffer.poolCacheMaxCount</code></td><td>processing buffer pool caches the buffers for later use, this is the maximum count cache will grow to. note that pool can create more buffers than it can cache if necessary.</td><td>Integer.MAX_VALUE</td></tr>
+<tr><td><code>druid.processing.formatString</code></td><td>Realtime and Historical processes use this format string to name their processing threads.</td><td>processing-%s</td></tr>
+<tr><td><code>druid.processing.numMergeBuffers</code></td><td>The number of direct memory buffers available for merging query results. The buffers are sized by <code>druid.processing.buffer.sizeBytes</code>. This property is effectively a concurrency limit for queries that require merging buffers. If you are using any queries that require merge buffers (currently, just groupBy v2) then you should have at least two of these.</td><td><code>max(2, druid.processing.numThreads / 4)</code></td></tr>
+<tr><td><code>druid.processing.numThreads</code></td><td>The number of processing threads to have available for parallel processing of segments. Our rule of thumb is <code>num_cores - 1</code>, which means that even under heavy load there will still be one core available to do background tasks like talking with ZooKeeper and pulling down segments. If only one core is available, this property defaults to the value <code>1</code>.</td><td>Number of cores - 1 (or 1)</td></tr>
+<tr><td><code>druid.processing.columnCache.sizeBytes</code></td><td>Maximum size in bytes for the dimension value lookup cache. Any value greater than <code>0</code> enables the cache. It is currently disabled by default. Enabling the lookup cache can significantly improve the performance of aggregators operating on dimension values, such as the JavaScript aggregator, or cardinality aggregator, but can slow things down if the cache hit rate is low (i.e. dimensions with few repeating values). Enabling it may also require additional garbage collection tuning to avoid long GC pauses.</td><td><code>0</code> (disabled)</td></tr>
+<tr><td><code>druid.processing.fifo</code></td><td>If the processing queue should treat tasks of equal priority in a FIFO manner</td><td><code>false</code></td></tr>
+<tr><td><code>druid.processing.tmpDir</code></td><td>Path where temporary files created while processing a query should be stored. If specified, this configuration takes priority over the default <code>java.io.tmpdir</code> path.</td><td>path represented by <code>java.io.tmpdir</code></td></tr>
+<tr><td><code>druid.processing.merge.useParallelMergePool</code></td><td>Enable automatic parallel merging for Brokers on a dedicated async ForkJoinPool. If <code>false</code>, instead merges will be done serially on the <code>HTTP</code> thread pool.</td><td><code>true</code></td></tr>
+<tr><td><code>druid.processing.merge.pool.parallelism</code></td><td>Size of ForkJoinPool. Note that the default configuration assumes that the value returned by <code>Runtime.getRuntime().availableProcessors()</code> represents 2 hyper-threads per physical core, and multiplies this value by <code>0.75</code> in attempt to size <code>1.5</code> times the number of <em>physical</em> cores.</td><td><code>Runtime.getRuntime().availableProcessors() * 0.75</code> (rounded up)</td></tr>
+<tr><td><code>druid.processing.merge.pool.defaultMaxQueryParallelism</code></td><td>Default maximum number of parallel merge tasks per query. Note that the default configuration assumes that the value returned by <code>Runtime.getRuntime().availableProcessors()</code> represents 2 hyper-threads per physical core, and multiplies this value by <code>0.5</code> in attempt to size to the number of <em>physical</em> cores.</td><td><code>Runtime.getRuntime().availableProcessors() * 0.5</code> (rounded up)</td></tr>
+<tr><td><code>druid.processing.merge.pool.awaitShutdownMillis</code></td><td>Time to wait for merge ForkJoinPool tasks to complete before ungracefully stopping on process shutdown in milliseconds.</td><td><code>60_000</code></td></tr>
+<tr><td><code>druid.processing.merge.task.targetRunTimeMillis</code></td><td>Ideal run-time of each ForkJoinPool merge task, before forking off a new task to continue merging sequences.</td><td><code>100</code></td></tr>
+<tr><td><code>druid.processing.merge.task.initialYieldNumRows</code></td><td>Number of rows to yield per ForkJoinPool merge task, before forking off a new task to continue merging sequences.</td><td><code>16384</code></td></tr>
+<tr><td><code>druid.processing.merge.task.smallBatchNumRows</code></td><td>Size of result batches to operate on in ForkJoinPool merge tasks.</td><td><code>4096</code></td></tr>
+</tbody>
+</table>
+<p>The amount of direct memory needed by Druid is at least
+<code>druid.processing.buffer.sizeBytes * (druid.processing.numMergeBuffers + druid.processing.numThreads + 1)</code>. You can
+ensure at least this amount of direct memory is available by providing <code>-XX:MaxDirectMemorySize=&lt;VALUE&gt;</code> at the command
+line.</p>
+<h5><a class="anchor" aria-hidden="true" id="broker-query-configuration"></a><a href="#broker-query-configuration" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Broker query configuration</h5>
+<p>See <a href="#general-query-configuration">general query configuration</a>.</p>
+<h4><a class="anchor" aria-hidden="true" id="sql"></a><a href="#sql" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>SQL</h4>
+<p>The Druid SQL server is configured through the following properties on the Broker.</p>
+<table>
+<thead>
+<tr><th>Property</th><th>Description</th><th>Default</th></tr>
+</thead>
+<tbody>
+<tr><td><code>druid.sql.enable</code></td><td>Whether to enable SQL at all, including background metadata fetching. If false, this overrides all other SQL-related properties and disables SQL metadata, serving, and planning completely.</td><td>true</td></tr>
+<tr><td><code>druid.sql.avatica.enable</code></td><td>Whether to enable JDBC querying at <code>/druid/v2/sql/avatica/</code>.</td><td>true</td></tr>
+<tr><td><code>druid.sql.avatica.maxConnections</code></td><td>Maximum number of open connections for the Avatica server. These are not HTTP connections, but are logical client connections that may span multiple HTTP connections.</td><td>25</td></tr>
+<tr><td><code>druid.sql.avatica.maxRowsPerFrame</code></td><td>Maximum number of rows to return in a single JDBC frame. Setting this property to -1 indicates that no row limit should be applied. Clients can optionally specify a row limit in their requests; if a client specifies a row limit, the lesser value of the client-provided limit and <code>maxRowsPerFrame</code> will be used.</td><td>5,000</td></tr>
+<tr><td><code>druid.sql.avatica.maxStatementsPerConnection</code></td><td>Maximum number of simultaneous open statements per Avatica client connection.</td><td>4</td></tr>
+<tr><td><code>druid.sql.avatica.connectionIdleTimeout</code></td><td>Avatica client connection idle timeout.</td><td>PT5M</td></tr>
+<tr><td><code>druid.sql.http.enable</code></td><td>Whether to enable JSON over HTTP querying at <code>/druid/v2/sql/</code>.</td><td>true</td></tr>
+<tr><td><code>druid.sql.planner.maxTopNLimit</code></td><td>Maximum threshold for a <a href="/docs/0.20.0/querying/topnquery.html">TopN query</a>. Higher limits will be planned as <a href="/docs/0.20.0/querying/groupbyquery.html">GroupBy queries</a> instead.</td><td>100000</td></tr>
+<tr><td><code>druid.sql.planner.metadataRefreshPeriod</code></td><td>Throttle for metadata refreshes.</td><td>PT1M</td></tr>
+<tr><td><code>druid.sql.planner.useApproximateCountDistinct</code></td><td>Whether to use an approximate cardinality algorithm for <code>COUNT(DISTINCT foo)</code>.</td><td>true</td></tr>
+<tr><td><code>druid.sql.planner.useApproximateTopN</code></td><td>Whether to use approximate <a href="../querying/topnquery.html">TopN queries</a> when a SQL query could be expressed as such. If false, exact <a href="../querying/groupbyquery.html">GroupBy queries</a> will be used instead.</td><td>true</td></tr>
+<tr><td><code>druid.sql.planner.requireTimeCondition</code></td><td>Whether to require SQL to have filter conditions on __time column so that all generated native queries will have user specified intervals. If true, all queries without filter condition on __time column will fail</td><td>false</td></tr>
+<tr><td><code>druid.sql.planner.sqlTimeZone</code></td><td>Sets the default time zone for the server, which will affect how time functions and timestamp literals behave. Should be a time zone name like &quot;America/Los_Angeles&quot; or offset like &quot;-08:00&quot;.</td><td>UTC</td></tr>
+<tr><td><code>druid.sql.planner.metadataSegmentCacheEnable</code></td><td>Whether to keep a cache of published segments in broker. If true, broker polls coordinator in background to get segments from metadata store and maintains a local cache. If false, coordinator's REST API will be invoked when broker needs published segments info.</td><td>false</td></tr>
+<tr><td><code>druid.sql.planner.metadataSegmentPollPeriod</code></td><td>How often to poll coordinator for published segments list if <code>druid.sql.planner.metadataSegmentCacheEnable</code> is set to true. Poll period is in milliseconds.</td><td>60000</td></tr>
+</tbody>
+</table>
+<blockquote>
+<p>Previous versions of Druid had properties named <code>druid.sql.planner.maxQueryCount</code> and <code>druid.sql.planner.maxSemiJoinRowsInMemory</code>.
+These properties are no longer available. Since Druid 0.18.0, you can use <code>druid.server.http.maxSubqueryRows</code> to control the maximum
+number of rows permitted across all subqueries.</p>
+</blockquote>
+<h4><a class="anchor" aria-hidden="true" id="broker-caching"></a><a href="#broker-caching" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Broker Caching</h4>
+<p>You can optionally only configure caching to be enabled on the Broker by setting caching configs here.</p>
+<table>
+<thead>
+<tr><th>Property</th><th>Possible Values</th><th>Description</th><th>Default</th></tr>
+</thead>
+<tbody>
+<tr><td><code>druid.broker.cache.useCache</code></td><td>true, false</td><td>Enable the cache on the Broker.</td><td>false</td></tr>
+<tr><td><code>druid.broker.cache.populateCache</code></td><td>true, false</td><td>Populate the cache on the Broker.</td><td>false</td></tr>
+<tr><td><code>druid.broker.cache.useResultLevelCache</code></td><td>true, false</td><td>Enable result level caching on the Broker.</td><td>false</td></tr>
+<tr><td><code>druid.broker.cache.populateResultLevelCache</code></td><td>true, false</td><td>Populate the result level cache on the Broker.</td><td>false</td></tr>
+<tr><td><code>druid.broker.cache.resultLevelCacheLimit</code></td><td>positive integer</td><td>Maximum size of query response that can be cached.</td><td><code>Integer.MAX_VALUE</code></td></tr>
+<tr><td><code>druid.broker.cache.unCacheable</code></td><td>All druid query types</td><td>All query types to not cache.</td><td><code>[]</code></td></tr>
+<tr><td><code>druid.broker.cache.cacheBulkMergeLimit</code></td><td>positive integer or 0</td><td>Queries with more segments than this number will not attempt to fetch from cache at the broker level, leaving potential caching fetches (and cache result merging) to the Historicals</td><td><code>Integer.MAX_VALUE</code></td></tr>
+<tr><td><code>druid.broker.cache.maxEntrySize</code></td><td>positive integer</td><td>Maximum cache entry size in bytes.</td><td>1_000_000</td></tr>
+</tbody>
+</table>
+<p>See <a href="#cache-configuration">cache configuration</a> for how to configure cache settings.</p>
+<h4><a class="anchor" aria-hidden="true" id="segment-discovery"></a><a href="#segment-discovery" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Segment Discovery</h4>
+<table>
+<thead>
+<tr><th>Property</th><th>Possible Values</th><th>Description</th><th>Default</th></tr>
+</thead>
+<tbody>
+<tr><td><code>druid.serverview.type</code></td><td>batch or http</td><td>Segment discovery method to use. &quot;http&quot; enables discovering segments using HTTP instead of zookeeper.</td><td>batch</td></tr>
+<tr><td><code>druid.broker.segment.watchedTiers</code></td><td>List of strings</td><td>Broker watches the segment announcements from processes serving segments to build cache of which process is serving which segments, this configuration allows to only consider segments being served from a whitelist of tiers. By default, Broker would consider all tiers. This can be used to partition your dataSources in specific Historical tiers and configure brokers in partitions so that they are only queryable for specific dataSources.</td><td>none</td></tr>
+<tr><td><code>druid.broker.segment.watchedDataSources</code></td><td>List of strings</td><td>Broker watches the segment announcements from processes serving segments to build cache of which process is serving which segments, this configuration allows to only consider segments being served from a whitelist of dataSources. By default, Broker would consider all datasources. This can be used to configure brokers in partitions so that they are only queryable for specific dataSources.</td><td>none</td></tr>
+<tr><td><code>druid.broker.segment.awaitInitializationOnStart</code></td><td>Boolean</td><td>Whether the Broker will wait for its view of segments to fully initialize before starting up. If set to 'true', the Broker's HTTP server will not start up, and the Broker will not announce itself as available, until the server view is initialized. See also <code>druid.sql.planner.awaitInitializationOnStart</code>, a related setting.</td><td>true</td></tr>
+</tbody>
+</table>
+<h2><a class="anchor" aria-hidden="true" id="cache-configuration"></a><a href="#cache-configuration" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Cache Configuration</h2>
+<p>This section describes caching configuration that is common to Broker, Historical, and MiddleManager/Peon processes.</p>
+<p>Caching could optionally be enabled on the Broker, Historical, and MiddleManager/Peon processes. See
+<a href="#broker-caching">Broker</a>, <a href="#historical-caching">Historical</a>, and <a href="#peon-caching">Peon</a> configuration options for how to
+enable it for different processes.</p>
+<p>Druid uses a local in-memory cache by default, unless a different type of cache is specified.
+Use the <code>druid.cache.type</code> configuration to set a different kind of cache.</p>
+<p>Cache settings are set globally, so the same configuration can be re-used
+for both Broker and Historical processes, when defined in the common properties file.</p>
+<h3><a class="anchor" aria-hidden="true" id="cache-type"></a><a href="#cache-type" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Cache Type</h3>
+<table>
+<thead>
+<tr><th>Property</th><th>Possible Values</th><th>Description</th><th>Default</th></tr>
+</thead>
+<tbody>
+<tr><td><code>druid.cache.type</code></td><td><code>local</code>, <code>memcached</code>, <code>hybrid</code>, <code>caffeine</code></td><td>The type of cache to use for queries. See below of the configuration options for each cache type</td><td><code>caffeine</code></td></tr>
+</tbody>
+</table>
+<h4><a class="anchor" aria-hidden="true" id="local-cache"></a><a href="#local-cache" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Local Cache</h4>
+<blockquote>
+<p>DEPRECATED: Use caffeine (default as of v0.12.0) instead</p>
+</blockquote>
+<p>The local cache is deprecated in favor of the Caffeine cache, and may be removed in a future version of Druid. The Caffeine cache affords significantly better performance and control over eviction behavior compared to <code>local</code> cache, and is recommended in any situation where you are using JRE 8u60 or higher.</p>
+<p>A simple in-memory LRU cache. Local cache resides in JVM heap memory, so if you enable it, make sure you increase heap size accordingly.</p>
+<table>
+<thead>
+<tr><th>Property</th><th>Description</th><th>Default</th></tr>
+</thead>
+<tbody>
+<tr><td><code>druid.cache.sizeInBytes</code></td><td>Maximum cache size in bytes. Zero disables caching.</td><td>0</td></tr>
+<tr><td><code>druid.cache.initialSize</code></td><td>Initial size of the hashtable backing the cache.</td><td>500000</td></tr>
+<tr><td><code>druid.cache.logEvictionCount</code></td><td>If non-zero, log cache eviction every <code>logEvictionCount</code> items.</td><td>0</td></tr>
+</tbody>
+</table>
+<h4><a class="anchor" aria-hidden="true" id="caffeine-cache"></a><a href="#caffeine-cache" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Caffeine Cache</h4>
+<p>A highly performant local cache implementation for Druid based on <a href="https://github.com/ben-manes/caffeine">Caffeine</a>. Requires a JRE8u60 or higher if using <code>COMMON_FJP</code>.</p>
+<h5><a class="anchor" aria-hidden="true" id="configuration"></a><a href="#configuration" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Configuration</h5>
+<p>Below are the configuration options known to this module:</p>
+<table>
+<thead>
+<tr><th><code>runtime.properties</code></th><th>Description</th><th>Default</th></tr>
+</thead>
+<tbody>
+<tr><td><code>druid.cache.type</code></td><td>Set this to <code>caffeine</code> or leave out parameter</td><td><code>caffeine</code></td></tr>
+<tr><td><code>druid.cache.sizeInBytes</code></td><td>The maximum size of the cache in bytes on heap. It can be configured as described in <a href="/docs/0.20.0/configuration/human-readable-byte.html">here</a>.</td><td>min(1GiB, Runtime.maxMemory / 10)</td></tr>
+<tr><td><code>druid.cache.expireAfter</code></td><td>The time (in ms) after an access for which a cache entry may be expired</td><td>None (no time limit)</td></tr>
+<tr><td><code>druid.cache.cacheExecutorFactory</code></td><td>The executor factory to use for Caffeine maintenance. One of <code>COMMON_FJP</code>, <code>SINGLE_THREAD</code>, or <code>SAME_THREAD</code></td><td>ForkJoinPool common pool (<code>COMMON_FJP</code>)</td></tr>
+<tr><td><code>druid.cache.evictOnClose</code></td><td>If a close of a namespace (ex: removing a segment from a process) should cause an eager eviction of associated cache values</td><td><code>false</code></td></tr>
+</tbody>
+</table>
+<h5><a class="anchor" aria-hidden="true" id="druidcachecacheexecutorfactory"></a><a href="#druidcachecacheexecutorfactory" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a><code>druid.cache.cacheExecutorFactory</code></h5>
+<p>Here are the possible values for <code>druid.cache.cacheExecutorFactory</code>, which controls how maintenance tasks are run</p>
+<ul>
+<li><code>COMMON_FJP</code> (default) use the common ForkJoinPool. Should use with <a href="https://github.com/apache/druid/pull/4810#issuecomment-329922810">JRE 8u60 or higher</a>. Older versions of the JRE may have worse performance than newer JRE versions.</li>
+<li><code>SINGLE_THREAD</code> Use a single-threaded executor.</li>
+<li><code>SAME_THREAD</code> Cache maintenance is done eagerly.</li>
+</ul>
+<h5><a class="anchor" aria-hidden="true" id="metrics"></a><a href="#metrics" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Metrics</h5>
+<p>In addition to the normal cache metrics, the caffeine cache implementation also reports the following in both <code>total</code> and <code>delta</code></p>
+<table>
+<thead>
+<tr><th>Metric</th><th>Description</th><th>Normal value</th></tr>
+</thead>
+<tbody>
+<tr><td><code>query/cache/caffeine/*/requests</code></td><td>Count of hits or misses</td><td>hit + miss</td></tr>
+<tr><td><code>query/cache/caffeine/*/loadTime</code></td><td>Length of time caffeine spends loading new values (unused feature)</td><td>0</td></tr>
+<tr><td><code>query/cache/caffeine/*/evictionBytes</code></td><td>Size in bytes that have been evicted from the cache</td><td>Varies, should tune cache <code>sizeInBytes</code> so that <code>sizeInBytes</code>/<code>evictionBytes</code> is approximately the rate of cache churn you desire</td></tr>
+</tbody>
+</table>
+<h5><a class="anchor" aria-hidden="true" id="memcached"></a><a href="#memcached" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Memcached</h5>
+<p>Uses memcached as cache backend. This allows all processes to share the same cache.</p>
+<table>
+<thead>
+<tr><th>Property</th><th>Description</th><th>Default</th></tr>
+</thead>
+<tbody>
+<tr><td><code>druid.cache.expiration</code></td><td>Memcached <a href="https://code.google.com/p/memcached/wiki/NewCommands#Standard_Protocol">expiration time</a>.</td><td>2592000 (30 days)</td></tr>
+<tr><td><code>druid.cache.timeout</code></td><td>Maximum time in milliseconds to wait for a response from Memcached.</td><td>500</td></tr>
+<tr><td><code>druid.cache.hosts</code></td><td>Comma separated list of Memcached hosts <code>&lt;host:port&gt;</code>.</td><td>none</td></tr>
+<tr><td><code>druid.cache.maxObjectSize</code></td><td>Maximum object size in bytes for a Memcached object.</td><td>52428800 (50 MB)</td></tr>
+<tr><td><code>druid.cache.memcachedPrefix</code></td><td>Key prefix for all keys in Memcached.</td><td>druid</td></tr>
+<tr><td><code>druid.cache.numConnections</code></td><td>Number of memcached connections to use.</td><td>1</td></tr>
+<tr><td><code>druid.cache.protocol</code></td><td>Memcached communication protocol. Can be binary or text.</td><td>binary</td></tr>
+<tr><td><code>druid.cache.locator</code></td><td>Memcached locator. Can be consistent or array_mod.</td><td>consistent</td></tr>
+</tbody>
+</table>
+<h4><a class="anchor" aria-hidden="true" id="hybrid"></a><a href="#hybrid" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Hybrid</h4>
+<p>Uses a combination of any two caches as a two-level L1 / L2 cache.
+This may be used to combine a local in-memory cache with a remote memcached cache.</p>
+<p>Cache requests will first check L1 cache before checking L2.
+If there is an L1 miss and L2 hit, it will also populate L1.</p>
+<table>
+<thead>
+<tr><th>Property</th><th>Description</th><th>Default</th></tr>
+</thead>
+<tbody>
+<tr><td><code>druid.cache.l1.type</code></td><td>type of cache to use for L1 cache. See <code>druid.cache.type</code> configuration for valid types.</td><td><code>caffeine</code></td></tr>
+<tr><td><code>druid.cache.l2.type</code></td><td>type of cache to use for L2 cache. See <code>druid.cache.type</code> configuration for valid types.</td><td><code>caffeine</code></td></tr>
+<tr><td><code>druid.cache.l1.*</code></td><td>Any property valid for the given type of L1 cache can be set using this prefix. For instance, if you are using a <code>caffeine</code> L1 cache, specify <code>druid.cache.l1.sizeInBytes</code> to set its size.</td><td>defaults are the same as for the given cache type.</td></tr>
+<tr><td><code>druid.cache.l2.*</code></td><td>Prefix for L2 cache settings, see description for L1.</td><td>defaults are the same as for the given cache type.</td></tr>
+<tr><td><code>druid.cache.useL2</code></td><td>A boolean indicating whether to query L2 cache, if it's a miss in L1. It makes sense to configure this to <code>false</code> on Historical processes, if L2 is a remote cache like <code>memcached</code>, and this cache also used on brokers, because in this case if a query reached Historical it means that a broker didn't find corresponding results in the same remote cache, so a query to the remote cache from Historical is guaranteed to be a miss.</td><td><code>true</code></td></tr>
+<tr><td><code>druid.cache.populateL2</code></td><td>A boolean indicating whether to put results into L2 cache.</td><td><code>true</code></td></tr>
+</tbody>
+</table>
+<h2><a class="anchor" aria-hidden="true" id="general-query-configuration"></a><a href="#general-query-configuration" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>General query configuration</h2>
+<p>This section describes configurations that control behavior of Druid's query types, applicable to Broker, Historical, and MiddleManager processes.</p>
+<h3><a class="anchor" aria-hidden="true" id="overriding-default-query-context-values"></a><a href="#overriding-default-query-context-values" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Overriding default query context values</h3>
+<p>Any <a href="../querying/query-context.html#general-parameters">Query Context General Parameter</a> default value can be
+overridden by setting runtime property in the format of <code>druid.query.default.context.{query_context_key}</code>.
+<code>druid.query.default.context.{query_context_key}</code> runtime property prefix applies to all current and future
+query context keys, the same as how query context parameter passed with the query works. Note that the runtime property
+value can be overridden if value for the same key is explicitly specify in the query contexts.</p>
+<p>The precedence chain for query context values is as follows:</p>
+<p>hard-coded default value in Druid code &lt;- runtime property not prefixed with <code>druid.query.default.context</code>
+&lt;- runtime property prefixed with <code>druid.query.default.context</code> &lt;- context parameter in the query</p>
+<p>Note that not all query context key has a runtime property not prefixed with <code>druid.query.default.context</code> that can
+override the hard-coded default value. For example, <code>maxQueuedBytes</code> has <code>druid.broker.http.maxQueuedBytes</code>
+but <code>joinFilterRewriteMaxSize</code> does not. Hence, the only way of overriding <code>joinFilterRewriteMaxSize</code> hard-coded default
+value is with runtime property <code>druid.query.default.context.joinFilterRewriteMaxSize</code>.</p>
+<p>To further elaborate on the previous example:</p>
+<p>If neither <code>druid.broker.http.maxQueuedBytes</code> or <code>druid.query.default.context.maxQueuedBytes</code> is set and
+the query does not have <code>maxQueuedBytes</code> in the context, then the hard-coded value in Druid code is use.
+If runtime property only contains <code>druid.broker.http.maxQueuedBytes=x</code> and query does not have <code>maxQueuedBytes</code> in the
+context, then the value of the property, <code>x</code>, is use. However, if query does have <code>maxQueuedBytes</code> in the context,
+then that value is use instead.
+If runtime property only contains <code>druid.query.default.context.maxQueuedBytes=y</code> OR runtime property contains both
+<code>druid.broker.http.maxQueuedBytes=x</code> and <code>druid.query.default.context.maxQueuedBytes=y</code>, then the value of
+<code>druid.query.default.context.maxQueuedBytes</code>, <code>y</code>, is use (given that query does not have <code>maxQueuedBytes</code> in the
+context). If query does have <code>maxQueuedBytes</code> in the context, then that value is use instead.</p>
+<h3><a class="anchor" aria-hidden="true" id="topn-query-config"></a><a href="#topn-query-config" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>TopN query config</h3>
+<table>
+<thead>
+<tr><th>Property</th><th>Description</th><th>Default</th></tr>
+</thead>
+<tbody>
+<tr><td><code>druid.query.topN.minTopNThreshold</code></td><td>See <a href="../querying/topnquery.html#aliasing">TopN Aliasing</a> for details.</td><td>1000</td></tr>
+</tbody>
+</table>
+<h3><a class="anchor" aria-hidden="true" id="search-query-config"></a><a href="#search-query-config" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Search query config</h3>
+<table>
+<thead>
+<tr><th>Property</th><th>Description</th><th>Default</th></tr>
+</thead>
+<tbody>
+<tr><td><code>druid.query.search.maxSearchLimit</code></td><td>Maximum number of search results to return.</td><td>1000</td></tr>
+<tr><td><code>druid.query.search.searchStrategy</code></td><td>Default search query strategy.</td><td>useIndexes</td></tr>
+</tbody>
+</table>
+<h3><a class="anchor" aria-hidden="true" id="segmentmetadata-query-config"></a><a href="#segmentmetadata-query-config" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>SegmentMetadata query config</h3>
+<table>
+<thead>
+<tr><th>Property</th><th>Description</th><th>Default</th></tr>
+</thead>
+<tbody>
+<tr><td><code>druid.query.segmentMetadata.defaultHistory</code></td><td>When no interval is specified in the query, use a default interval of defaultHistory before the end time of the most recent segment, specified in ISO8601 format. This property also controls the duration of the default interval used by GET /druid/v2/datasources/{dataSourceName} interactions for retrieving datasource dimensions/metrics.</td><td>P1W</td></tr>
+<tr><td><code>druid.query.segmentMetadata.defaultAnalysisTypes</code></td><td>This can be used to set the Default Analysis Types for all segment metadata queries, this can be overridden when making the query</td><td>[&quot;cardinality&quot;, &quot;interval&quot;, &quot;minmax&quot;]</td></tr>
+</tbody>
+</table>
+<h3><a class="anchor" aria-hidden="true" id="groupby-query-config"></a><a href="#groupby-query-config" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>GroupBy query config</h3>
+<p>This section describes the configurations for groupBy queries. You can set the runtime properties in the <code>runtime.properties</code> file on Broker, Historical, and MiddleManager processes. You can set the query context parameters through the <a href="/docs/0.20.0/querying/query-context.html">query context</a>.</p>
+<h4><a class="anchor" aria-hidden="true" id="configurations-for-groupby-v2"></a><a href="#configurations-for-groupby-v2" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Configurations for groupBy v2</h4>
+<p>Supported runtime properties:</p>
+<table>
+<thead>
+<tr><th>Property</th><th>Description</th><th>Default</th></tr>
+</thead>
+<tbody>
+<tr><td><code>druid.query.groupBy.maxMergingDictionarySize</code></td><td>Maximum amount of heap space (approximately) to use for the string dictionary during merging. When the dictionary exceeds this size, a spill to disk will be triggered.</td><td>100000000</td></tr>
+<tr><td><code>druid.query.groupBy.maxOnDiskStorage</code></td><td>Maximum amount of disk space to use, per-query, for spilling result sets to disk when either the merging buffer or the dictionary fills up. Queries that exceed this limit will fail. Set to zero to disable disk spilling.</td><td>0 (disabled)</td></tr>
+</tbody>
+</table>
+<p>Supported query contexts:</p>
+<table>
+<thead>
+<tr><th>Key</th><th>Description</th></tr>
+</thead>
+<tbody>
+<tr><td><code>maxMergingDictionarySize</code></td><td>Can be used to lower the value of <code>druid.query.groupBy.maxMergingDictionarySize</code> for this query.</td></tr>
+<tr><td><code>maxOnDiskStorage</code></td><td>Can be used to lower the value of <code>druid.query.groupBy.maxOnDiskStorage</code> for this query.</td></tr>
+</tbody>
+</table>
+<h3><a class="anchor" aria-hidden="true" id="advanced-configurations"></a><a href="#advanced-configurations" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Advanced configurations</h3>
+<h4><a class="anchor" aria-hidden="true" id="common-configurations-for-all-groupby-strategies"></a><a href="#common-configurations-for-all-groupby-strategies" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Common configurations for all groupBy strategies</h4>
+<p>Supported runtime properties:</p>
+<table>
+<thead>
+<tr><th>Property</th><th>Description</th><th>Default</th></tr>
+</thead>
+<tbody>
+<tr><td><code>druid.query.groupBy.defaultStrategy</code></td><td>Default groupBy query strategy.</td><td>v2</td></tr>
+<tr><td><code>druid.query.groupBy.singleThreaded</code></td><td>Merge results using a single thread.</td><td>false</td></tr>
+</tbody>
+</table>
+<p>Supported query contexts:</p>
+<table>
+<thead>
+<tr><th>Key</th><th>Description</th></tr>
+</thead>
+<tbody>
+<tr><td><code>groupByStrategy</code></td><td>Overrides the value of <code>druid.query.groupBy.defaultStrategy</code> for this query.</td></tr>
+<tr><td><code>groupByIsSingleThreaded</code></td><td>Overrides the value of <code>druid.query.groupBy.singleThreaded</code> for this query.</td></tr>
+</tbody>
+</table>
+<h4><a class="anchor" aria-hidden="true" id="groupby-v2-configurations"></a><a href="#groupby-v2-configurations" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>GroupBy v2 configurations</h4>
+<p>Supported runtime properties:</p>
+<table>
+<thead>
+<tr><th>Property</th><th>Description</th><th>Default</th></tr>
+</thead>
+<tbody>
+<tr><td><code>druid.query.groupBy.bufferGrouperInitialBuckets</code></td><td>Initial number of buckets in the off-heap hash table used for grouping results. Set to 0 to use a reasonable default (1024).</td><td>0</td></tr>
+<tr><td><code>druid.query.groupBy.bufferGrouperMaxLoadFactor</code></td><td>Maximum load factor of the off-heap hash table used for grouping results. When the load factor exceeds this size, the table will be grown or spilled to disk. Set to 0 to use a reasonable default (0.7).</td><td>0</td></tr>
+<tr><td><code>druid.query.groupBy.forceHashAggregation</code></td><td>Force to use hash-based aggregation.</td><td>false</td></tr>
+<tr><td><code>druid.query.groupBy.intermediateCombineDegree</code></td><td>Number of intermediate processes combined together in the combining tree. Higher degrees will need less threads which might be helpful to improve the query performance by reducing the overhead of too many threads if the server has sufficiently powerful CPU cores.</td><td>8</td></tr>
+<tr><td><code>druid.query.groupBy.numParallelCombineThreads</code></td><td>Hint for the number of parallel combining threads. This should be larger than 1 to turn on the parallel combining feature. The actual number of threads used for parallel combining is min(<code>druid.query.groupBy.numParallelCombineThreads</code>, <code>druid.processing.numThreads</code>).</td><td>1 (disabled)</td></tr>
+</tbody>
+</table>
+<p>Supported query contexts:</p>
+<table>
+<thead>
+<tr><th>Key</th><th>Description</th><th>Default</th></tr>
+</thead>
+<tbody>
+<tr><td><code>bufferGrouperInitialBuckets</code></td><td>Overrides the value of <code>druid.query.groupBy.bufferGrouperInitialBuckets</code> for this query.</td><td>None</td></tr>
+<tr><td><code>bufferGrouperMaxLoadFactor</code></td><td>Overrides the value of <code>druid.query.groupBy.bufferGrouperMaxLoadFactor</code> for this query.</td><td>None</td></tr>
+<tr><td><code>forceHashAggregation</code></td><td>Overrides the value of <code>druid.query.groupBy.forceHashAggregation</code></td><td>None</td></tr>
+<tr><td><code>intermediateCombineDegree</code></td><td>Overrides the value of <code>druid.query.groupBy.intermediateCombineDegree</code></td><td>None</td></tr>
+<tr><td><code>numParallelCombineThreads</code></td><td>Overrides the value of <code>druid.query.groupBy.numParallelCombineThreads</code></td><td>None</td></tr>
+<tr><td><code>sortByDimsFirst</code></td><td>Sort the results first by dimension values and then by timestamp.</td><td>false</td></tr>
+<tr><td><code>forceLimitPushDown</code></td><td>When all fields in the orderby are part of the grouping key, the broker will push limit application down to the Historical processes. When the sorting order uses fields that are not in the grouping key, applying this optimization can result in approximate results with unknown accuracy, so this optimization is disabled by default in that case. Enabling this context flag turns on limit push down for limit/orderbys that contain non-grouping key columns.</td><td>false</td></tr>
+</tbody>
+</table>
+<h4><a class="anchor" aria-hidden="true" id="groupby-v1-configurations"></a><a href="#groupby-v1-configurations" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>GroupBy v1 configurations</h4>
+<p>Supported runtime properties:</p>
+<table>
+<thead>
+<tr><th>Property</th><th>Description</th><th>Default</th></tr>
+</thead>
+<tbody>
+<tr><td><code>druid.query.groupBy.maxIntermediateRows</code></td><td>Maximum number of intermediate rows for the per-segment grouping engine. This is a tuning parameter that does not impose a hard limit; rather, it potentially shifts merging work from the per-segment engine to the overall merging index. Queries that exceed this limit will not fail.</td><td>50000</td></tr>
+<tr><td><code>druid.query.groupBy.maxResults</code></td><td>Maximum number of results. Queries that exceed this limit will fail.</td><td>500000</td></tr>
+</tbody>
+</table>
+<p>Supported query contexts:</p>
+<table>
+<thead>
+<tr><th>Key</th><th>Description</th><th>Default</th></tr>
+</thead>
+<tbody>
+<tr><td><code>maxIntermediateRows</code></td><td>Can be used to lower the value of <code>druid.query.groupBy.maxIntermediateRows</code> for this query.</td><td>None</td></tr>
+<tr><td><code>maxResults</code></td><td>Can be used to lower the value of <code>druid.query.groupBy.maxResults</code> for this query.</td><td>None</td></tr>
+<tr><td><code>useOffheap</code></td><td>Set to true to store aggregations off-heap when merging results.</td><td>false</td></tr>
+</tbody>
+</table>
+<h3><a class="anchor" aria-hidden="true" id="router"></a><a href="#router" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Router</h3>
+<h4><a class="anchor" aria-hidden="true" id="router-process-configs"></a><a href="#router-process-configs" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Router Process Configs</h4>
+<table>
+<thead>
+<tr><th>Property</th><th>Description</th><th>Default</th></tr>
+</thead>
+<tbody>
+<tr><td><code>druid.host</code></td><td>The host for the current process. This is used to advertise the current processes location as reachable from another process and should generally be specified such that <code>http://${druid.host}/</code> could actually talk to this process</td><td>InetAddress.getLocalHost().getCanonicalHostName()</td></tr>
+<tr><td><code>druid.bindOnHost</code></td><td>Indicating whether the process's internal jetty server bind on <code>druid.host</code>. Default is false, which means binding to all interfaces.</td><td>false</td></tr>
+<tr><td><code>druid.plaintextPort</code></td><td>This is the port to actually listen on; unless port mapping is used, this will be the same port as is on <code>druid.host</code></td><td>8888</td></tr>
+<tr><td><code>druid.tlsPort</code></td><td>TLS port for HTTPS connector, if <a href="/docs/0.20.0/operations/tls-support.html">druid.enableTlsPort</a> is set then this config will be used. If <code>druid.host</code> contains port then that port will be ignored. This should be a non-negative Integer.</td><td>9088</td></tr>
+<tr><td><code>druid.service</code></td><td>The name of the service. This is used as a dimension when emitting metrics and alerts to differentiate between the various services</td><td>druid/router</td></tr>
+</tbody>
+</table>
+<h4><a class="anchor" aria-hidden="true" id="runtime-configuration"></a><a href="#runtime-configuration" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Runtime Configuration</h4>
+<table>
+<thead>
+<tr><th>Property</th><th>Description</th><th>Default</th></tr>
+</thead>
+<tbody>
+<tr><td><code>druid.router.defaultBrokerServiceName</code></td><td>The default Broker to connect to in case service discovery fails.</td><td>druid/broker</td></tr>
+<tr><td><code>druid.router.tierToBrokerMap</code></td><td>Queries for a certain tier of data are routed to their appropriate Broker. This value should be an ordered JSON map of tiers to Broker names. The priority of Brokers is based on the ordering.</td><td>{&quot;_default_tier&quot;: &quot;<defaultBrokerServiceName>&quot;}</td></tr>
+<tr><td><code>druid.router.defaultRule</code></td><td>The default rule for all datasources.</td><td>&quot;_default&quot;</td></tr>
+<tr><td><code>druid.router.pollPeriod</code></td><td>How often to poll for new rules.</td><td>PT1M</td></tr>
+<tr><td><code>druid.router.strategies</code></td><td>Please see <a href="../design/router.html#router-strategies">Router Strategies</a> for details.</td><td>[{&quot;type&quot;:&quot;timeBoundary&quot;},{&quot;type&quot;:&quot;priority&quot;}]</td></tr>
+<tr><td><code>druid.router.avatica.balancer.type</code></td><td>Class to use for balancing Avatica queries across Brokers. Please see <a href="../design/router.html#avatica-query-balancing">Avatica Query Balancing</a>.</td><td>rendezvousHash</td></tr>
+<tr><td><code>druid.router.managementProxy.enabled</code></td><td>Enables the Router's <a href="../design/router.html#router-as-management-proxy">management proxy</a> functionality.</td><td>false</td></tr>
+<tr><td><code>druid.router.http.numConnections</code></td><td>Size of connection pool for the Router to connect to Broker processes. If there are more queries than this number that all need to speak to the same process, then they will queue up.</td><td><code>20</code></td></tr>
+<tr><td><code>druid.router.http.readTimeout</code></td><td>The timeout for data reads from Broker processes.</td><td><code>PT15M</code></td></tr>
+<tr><td><code>druid.router.http.numMaxThreads</code></td><td>Maximum number of worker threads to handle HTTP requests and responses</td><td><code>max(10, ((number of cores * 17) / 16 + 2) + 30)</code></td></tr>
+<tr><td><code>druid.router.http.numRequestsQueued</code></td><td>Maximum number of requests that may be queued to a destination</td><td><code>1024</code></td></tr>
+<tr><td><code>druid.router.http.requestBuffersize</code></td><td>Size of the content buffer for receiving requests. These buffers are only used for active connections that have requests with bodies that will not fit within the header buffer</td><td><code>8 * 1024</code></td></tr>
+</tbody>
+</table>
+</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/0.20.0/development/geo.html"><span class="arrow-prev">← </span><span>Spatial filters</span></a><a class="docs-next button" href="/docs/0.20.0/development/extensions.html"><span>Extensions</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#recommended-configuration-file-organization">Recommended Configuration File Organization</a></li><li><a href="#common-configurations">Common Configurations</a><ul class="toc-headings"><li><a href="#jvm-configuration-best-practices">JVM Configuration Best Practices</a></li><li><a href="#extensions">Extensions</a></li><li><a href="#modules">Modules</a></li><li><a href="#zookeeper">Zookeeper</a></li><li><a href="#exhibitor">Exhibitor</a></li><li><a href="#tls">TLS</a></li><li><a href="#authentication-and-authorization">Authentication and Authorization</a></li><li><a href="#startup-logging">Startup Logging</a></li><li><a href="#request-logging">Request Logging</a></li><li><a href="#audit-logging">Audit Logging</a></li><li><a href="#enabling-metrics">Enabling Metrics</a></li><li><a href="#emitting-metrics">Emitting Metrics</a></li><li><a href="#metadata-storage">Metadata storage</a></li><li><a href="#deep-storage">Deep storage</a></li><li><a href="#task-logging">Task Logging</a></li><li><a href="#overlord-discovery">Overlord Discovery</a></li><li><a href="#coordinator-discovery">Coordinator Discovery</a></li><li><a href="#announcing-segments">Announcing Segments</a></li><li><a href="#javascript">JavaScript</a></li><li><a href="#double-column-storage">Double Column storage</a></li><li><a href="#sql-compatible-null-handling">SQL compatible null handling</a></li><li><a href="#http-client">HTTP Client</a></li></ul></li><li><a href="#master-server">Master Server</a><ul class="toc-headings"><li><a href="#coordinator">Coordinator</a></li><li><a href="#overlord">Overlord</a></li></ul></li><li><a href="#data-server">Data Server</a><ul class="toc-headings"><li><a href="#middlemanager-and-peons">MiddleManager and Peons</a></li><li><a href="#indexer">Indexer</a></li><li><a href="#historical">Historical</a></li></ul></li><li><a href="#query-server">Query Server</a><ul class="toc-headings"><li><a href="#broker">Broker</a></li></ul></li><li><a href="#cache-configuration">Cache Configuration</a><ul class="toc-headings"><li><a href="#cache-type">Cache Type</a></li></ul></li><li><a href="#general-query-configuration">General query configuration</a><ul class="toc-headings"><li><a href="#overriding-default-query-context-values">Overriding default query context values</a></li><li><a href="#topn-query-config">TopN query config</a></li><li><a href="#search-query-config">Search query config</a></li><li><a href="#segmentmetadata-query-config">SegmentMetadata query config</a></li><li><a href="#groupby-query-config">GroupBy query config</a></li><li><a href="#advanced-configurations">Advanced configurations</a></li><li><a href="#router">Router</a></li></ul></li></ul></nav></div><footer class="nav-footer druid-footer" id="footer"><div class="container"><div class="text-center"><p><a href="/technology">Technology</a> · <a href="/use-cases">Use Cases</a> · <a href="/druid-powered">Powered by Druid</a> · <a href="/docs/0.20.0/latest">Docs</a> · <a href="/community/">Community</a> · <a href="/downloads.html">Download</a> · <a href="/faq">FAQ</a></p></div><div class="text-center"><a title="Join the user group" href="https://groups.google.com/forum/#!forum/druid-user" target="_blank"><span class="fa fa-comments"></span></a> · <a title="Follow Druid" href="https://twitter.com/druidio" target="_blank"><span class="fab fa-twitter"></span></a> · <a title="Download via Apache" href="https://www.apache.org/dyn/closer.cgi?path=/incubator/druid/{{ site.druid_versions[0].versions[0].version }}/apache-druid-{{ site.druid_versions[0].versions[0].version }}-bin.tar.gz" target="_blank"><span class="fas fa-feather"></span></a> · <a title="GitHub" href="https://github.com/apache/druid" target="_blank"><span class="fab fa-github"></span></a></div><div class="text-center license">Copyright © 2019 <a href="https://www.apache.org/" target="_blank">Apache Software Foundation</a>.<br/>Except where otherwise noted, licensed under <a rel="license" href="http://creativecommons.org/licenses/by-sa/4.0/">CC BY-SA 4.0</a>.<br/>Apache Druid, Druid, and the Druid logo are either registered trademarks or trademarks of The Apache Software Foundation in the United States and other countries.</div></div></footer></div><script type="text/javascript" src="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.js"></script><script>
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+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Logging · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/0.20.0/configuration/logging.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.20.0" /><meta property="og:title" content="Logging · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
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class="icon-toc"></i></div></div><div class="navGroups"><div class="navGroup"><h3 class="navGroupCategoryTitle collapsible">Getting started<span class="arrow"><svg width="24" height="24" viewBox="0 0 24 24"><path fill="#565656" d="M7.41 15.41L12 10.83l4.59 4.58L18 14l-6-6-6 6z"></path><path d="M0 0h24v24H0z" fill="none"></path></svg></span></h3><ul class="hide"><li class="navListItem"><a class="navItem" href="/docs/0.20.0/design/index.html">Introduction to Apache Druid</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/tutorials/index.html">Quickstart</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/tutorials/docker.html">Docker</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/operations/single-server.html">Single server deployment</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/tutorials/cluster.html">Clustered deployment</a></li></ul></div><div class="navGroup"><h3 class="navGroupCategoryTitle 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6z"></path><path d="M0 0h24v24H0z" fill="none"></path></svg></span></h3><ul class="hide"><li class="navListItem"><a class="navItem" href="/docs/0.20.0/ingestion/index.html">Ingestion</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/ingestion/data-formats.html">Data formats</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/ingestion/schema-design.html">Schema design tips</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/ingestion/data-management.html">Data management</a></li><div class="navGroup subNavGroup"><h4 class="navGroupSubcategoryTitle">Stream ingestion</h4><ul><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-core/kafka-ingestion.html">Apache Kafka</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-core/kinesis-ingestion.html">Amazon Kinesis</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/ingestion/tranquility.html">Tranquility</a></li></ul></div><div class="navGroup subNavGroup"><h4 class="navGroupSubcategoryTitle">Batch ingestion</h4><ul><li class="navListItem"><a class="navItem" href="/docs/0.20.0/ingestion/native-batch.html">Native batch</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/ingestion/hadoop.html">Hadoop-based</a></li></ul></div><li class="navListItem"><a class="navItem" href="/docs/0.20.0/ingestion/tasks.html">Task reference</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/ingestion/faq.html">Troubleshooting FAQ</a></li></ul></div><div class="navGroup"><h3 class="navGroupCategoryTitle collapsible">Querying<span class="arrow"><svg width="24" height="24" viewBox="0 0 24 24"><path fill="#565656" d="M7.41 15.41L12 10.83l4.59 4.58L18 14l-6-6-6 6z"></path><path d="M0 0h24v24H0z" fill="none"></path></svg></span></h3><ul class="hide"><li class="navListItem"><a class="navItem" href="/docs/0.20.0/querying/sql.html">Druid SQL</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/querying/querying.html">Native queries</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/querying/query-execution.html">Query execution</a></li><div class="navGroup subNavGroup"><h4 class="navGroupSubcategoryTitle">Concepts</h4><ul><li class="navListItem"><a class="navItem" href="/docs/0.20.0/querying/datasource.html">Datasources</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/querying/joins.html">Joins</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/querying/lookups.html">Lookups</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/querying/multi-value-dimensions.html">Multi-value dimensions</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/querying/multitenancy.html">Multitenancy</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/querying/caching.html">Query caching</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/querying/query-context.html">Context parameters</a></li></ul></div><div class="navGroup subNavGroup"><h4 class="navGroupSubcategoryTitle">Native query types</h4><ul><li class="navListItem"><a class="navItem" href="/docs/0.20.0/querying/timeseriesquery.html">Timeseries</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/querying/topnquery.html">TopN</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/querying/groupbyquery.html">GroupBy</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/querying/scan-query.html">Scan</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/querying/searchquery.html">Search</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/querying/timeboundaryquery.html">TimeBoundary</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/querying/segmentmetadataquery.html">SegmentMetadata</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/querying/datasourcemetadataquery.html">DatasourceMetadata</a></li></ul></div><div class="navGroup subNavGroup"><h4 class="navGroupSubcategoryTitle">Native query components</h4><ul><li class="navListItem"><a class="navItem" href="/docs/0.20.0/querying/filters.html">Filters</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/querying/granularities.html">Granularities</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/querying/dimensionspecs.html">Dimensions</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/querying/aggregations.html">Aggregations</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/querying/post-aggregations.html">Post-aggregations</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/misc/math-expr.html">Expressions</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/querying/having.html">Having filters (groupBy)</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/querying/limitspec.html">Sorting and limiting (groupBy)</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/querying/topnmetricspec.html">Sorting (topN)</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/querying/sorting-orders.html">String comparators</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/querying/virtual-columns.html">Virtual columns</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/geo.html">Spatial filters</a></li></ul></div></ul></div><div class="navGroup"><h3 class="navGroupCategoryTitle collapsible">Configuration<span class="arrow"><svg width="24" height="24" viewBox="0 0 24 24"><path fill="#565656" d="M7.41 15.41L12 10.83l4.59 4.58L18 14l-6-6-6 6z"></path><path d="M0 0h24v24H0z" 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class="navItem" href="/docs/0.20.0/operations/http-compression.html">HTTP compression</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/operations/tls-support.html">TLS support</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/operations/password-provider.html">Password providers</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/operations/dump-segment.html">dump-segment tool</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/operations/reset-cluster.html">reset-cluster tool</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/operations/insert-segment-to-db.html">insert-segment-to-db tool</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/operations/pull-deps.html">pull-deps tool</a></li><div class="navGroup subNavGroup"><h4 class="navGroupSubcategoryTitle">Misc</h4><ul><li class="navListItem"><a class="navItem" href="/docs/0.20.0/operations/management-uis.html">Legacy Management UIs</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/operations/deep-storage-migration.html">Deep storage migration</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/operations/export-metadata.html">Export Metadata Tool</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/operations/metadata-migration.html">Metadata Migration</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/operations/segment-optimization.html">Segment Size Optimization</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/operations/use_sbt_to_build_fat_jar.html">Content for build.sbt</a></li></ul></div></ul></div><div class="navGroup"><h3 class="navGroupCategoryTitle collapsible">Development<span class="arrow"><svg width="24" height="24" viewBox="0 0 24 24"><path fill="#565656" d="M7.41 15.41L12 10.83l4.59 4.58L18 14l-6-6-6 6z"></path><path d="M0 0h24v24H0z" fill="none"></path></svg></span></h3><ul class="hide"><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/overview.html">Developing on Druid</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/modules.html">Creating extensions</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/javascript.html">JavaScript functionality</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/build.html">Build from source</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/versioning.html">Versioning</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/experimental.html">Experimental features</a></li></ul></div><div class="navGroup"><h3 class="navGroupCategoryTitle collapsible">Misc<span class="arrow"><svg width="24" height="24" viewBox="0 0 24 24"><path fill="#565656" d="M7.41 15.41L12 10.83l4.59 4.58L18 14l-6-6-6 6z"></path><path d="M0 0h24v24H0z" fill="none"></path></svg></span></h3><ul class="hide"><li class="navListItem"><a class="navItem" href="/docs/0.20.0/misc/papers-and-talks.html">Papers</a></li></ul></div><div class="navGroup"><h3 class="navGroupCategoryTitle collapsible">Hidden<span class="arrow"><svg width="24" height="24" viewBox="0 0 24 24"><path fill="#565656" d="M7.41 15.41L12 10.83l4.59 4.58L18 14l-6-6-6 6z"></path><path d="M0 0h24v24H0z" fill="none"></path></svg></span></h3><ul class="hide"><li class="navListItem"><a class="navItem" href="/docs/0.20.0/comparisons/druid-vs-elasticsearch.html">Apache Druid vs Elasticsearch</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/comparisons/druid-vs-key-value.html">Apache Druid vs. Key/Value Stores (HBase/Cassandra/OpenTSDB)</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/comparisons/druid-vs-kudu.html">Apache Druid vs Kudu</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/comparisons/druid-vs-redshift.html">Apache Druid vs Redshift</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/comparisons/druid-vs-spark.html">Apache Druid vs Spark</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/comparisons/druid-vs-sql-on-hadoop.html">Apache Druid vs SQL-on-Hadoop</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/design/auth.html">Authentication and Authorization</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/design/broker.html">Broker</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/design/coordinator.html">Coordinator Process</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/design/historical.html">Historical Process</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/design/indexer.html">Indexer Process</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/design/indexing-service.html">Indexing Service</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/design/middlemanager.html">MiddleManager Process</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/design/overlord.html">Overlord Process</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/design/router.html">Router Process</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/design/peons.html">Peons</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-core/approximate-histograms.html">Approximate Histogram aggregators</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-core/avro.html">Apache Avro</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-core/azure.html">Microsoft Azure</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-core/bloom-filter.html">Bloom Filter</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-core/datasketches-extension.html">DataSketches extension</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-core/datasketches-hll.html">DataSketches HLL Sketch module</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-core/datasketches-quantiles.html">DataSketches Quantiles Sketch module</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-core/datasketches-theta.html">DataSketches Theta Sketch module</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-core/datasketches-tuple.html">DataSketches Tuple Sketch module</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-core/druid-basic-security.html">Basic Security</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-core/druid-kerberos.html">Kerberos</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-core/druid-lookups.html">Cached Lookup Module</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-core/druid-ranger-security.html">Apache Ranger Security</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-core/google.html">Google Cloud Storage</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-core/hdfs.html">HDFS</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-core/kafka-extraction-namespace.html">Apache Kafka Lookups</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-core/lookups-cached-global.html">Globally Cached Lookups</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-core/mysql.html">MySQL Metadata Store</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-core/orc.html">ORC Extension</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-core/druid-pac4j.html">Druid pac4j based Security extension</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-core/parquet.html">Apache Parquet Extension</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-core/postgresql.html">PostgreSQL Metadata Store</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-core/protobuf.html">Protobuf</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-core/s3.html">S3-compatible</a></li><li class="navListItem"><a class="navItem" 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+        </script></nav></div><div class="container mainContainer docsContainer"><div class="wrapper"><div class="post"><header class="postHeader"><a class="edit-page-link button" href="https://github.com/apache/druid/edit/master/docs/configuration/logging.md" target="_blank" rel="noreferrer noopener">Edit</a><h1 id="__docusaurus" class="postHeaderTitle">Logging</h1></header><article><div><span><!--
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+<p>Apache Druid processes will emit logs that are useful for debugging to the console. Druid processes also emit periodic metrics about their state. For more about metrics, see <a href="../configuration/index.html#enabling-metrics">Configuration</a>. Metric logs are printed to the console by default, and can be disabled with <code>-Ddruid.emitter.logging.logLevel=debug</code>.</p>
+<p>Druid uses <a href="http://logging.apache.org/log4j/2.x/">log4j2</a> for logging. Logging can be configured with a log4j2.xml file. Add the path to the directory containing the log4j2.xml file (e.g. the _common/ dir) to your classpath if you want to override default Druid log configuration. Note that this directory should be earlier in the classpath than the druid jars. The easiest way to do this is to prefix the classpath with the config dir.</p>
+<p>To enable java logging to go through log4j2, set the <code>-Djava.util.logging.manager=org.apache.logging.log4j.jul.LogManager</code> server parameter.</p>
+<p>An example log4j2.xml ships with Druid under config/_common/log4j2.xml, and a sample file is also shown below:</p>
+<pre><code class="hljs"><span class="xml"><span class="hljs-meta">&lt;?xml version="1.0" encoding="UTF-8" ?&gt;</span>
+<span class="hljs-tag">&lt;<span class="hljs-name">Configuration</span> <span class="hljs-attr">status</span>=<span class="hljs-string">"WARN"</span>&gt;</span>
+  <span class="hljs-tag">&lt;<span class="hljs-name">Appenders</span>&gt;</span>
+    <span class="hljs-tag">&lt;<span class="hljs-name">Console</span> <span class="hljs-attr">name</span>=<span class="hljs-string">"Console"</span> <span class="hljs-attr">target</span>=<span class="hljs-string">"SYSTEM_OUT"</span>&gt;</span>
+      <span class="hljs-tag">&lt;<span class="hljs-name">PatternLayout</span> <span class="hljs-attr">pattern</span>=<span class="hljs-string">"%d</span></span></span><span class="hljs-template-variable">{ISO8601}</span><span class="xml"><span class="hljs-tag"><span class="hljs-string"> %p [%t] %c - %m%n"</span>/&gt;</span>
+    <span class="hljs-tag">&lt;/<span class="hljs-name">Console</span>&gt;</span>
+  <span class="hljs-tag">&lt;/<span class="hljs-name">Appenders</span>&gt;</span>
+  <span class="hljs-tag">&lt;<span class="hljs-name">Loggers</span>&gt;</span>
+    <span class="hljs-tag">&lt;<span class="hljs-name">Root</span> <span class="hljs-attr">level</span>=<span class="hljs-string">"info"</span>&gt;</span>
+      <span class="hljs-tag">&lt;<span class="hljs-name">AppenderRef</span> <span class="hljs-attr">ref</span>=<span class="hljs-string">"Console"</span>/&gt;</span>
+    <span class="hljs-tag">&lt;/<span class="hljs-name">Root</span>&gt;</span>
+
+    <span class="hljs-comment">&lt;!-- Uncomment to enable logging of all HTTP requests
+    &lt;Logger name="org.apache.druid.jetty.RequestLog" additivity="false" level="DEBUG"&gt;
+        &lt;AppenderRef ref="Console"/&gt;
+    &lt;/Logger&gt;
+    --&gt;</span>
+  <span class="hljs-tag">&lt;/<span class="hljs-name">Loggers</span>&gt;</span>
+<span class="hljs-tag">&lt;/<span class="hljs-name">Configuration</span>&gt;</span>
+</span></code></pre>
+<h2><a class="anchor" aria-hidden="true" id="my-logs-are-really-chatty-can-i-set-them-to-asynchronously-write"></a><a href="#my-logs-are-really-chatty-can-i-set-them-to-asynchronously-write" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>My logs are really chatty, can I set them to asynchronously write?</h2>
+<p>Yes, using a <code>log4j2.xml</code> similar to the following causes some of the more chatty classes to write asynchronously:</p>
+<pre><code class="hljs"><span class="xml"><span class="hljs-meta">&lt;?xml version="1.0" encoding="UTF-8" ?&gt;</span>
+<span class="hljs-tag">&lt;<span class="hljs-name">Configuration</span> <span class="hljs-attr">status</span>=<span class="hljs-string">"WARN"</span>&gt;</span>
+  <span class="hljs-tag">&lt;<span class="hljs-name">Appenders</span>&gt;</span>
+    <span class="hljs-tag">&lt;<span class="hljs-name">Console</span> <span class="hljs-attr">name</span>=<span class="hljs-string">"Console"</span> <span class="hljs-attr">target</span>=<span class="hljs-string">"SYSTEM_OUT"</span>&gt;</span>
+      <span class="hljs-tag">&lt;<span class="hljs-name">PatternLayout</span> <span class="hljs-attr">pattern</span>=<span class="hljs-string">"%d</span></span></span><span class="hljs-template-variable">{ISO8601}</span><span class="xml"><span class="hljs-tag"><span class="hljs-string"> %p [%t] %c - %m%n"</span>/&gt;</span>
+    <span class="hljs-tag">&lt;/<span class="hljs-name">Console</span>&gt;</span>
+  <span class="hljs-tag">&lt;/<span class="hljs-name">Appenders</span>&gt;</span>
+  <span class="hljs-tag">&lt;<span class="hljs-name">Loggers</span>&gt;</span>
+    <span class="hljs-tag">&lt;<span class="hljs-name">AsyncLogger</span> <span class="hljs-attr">name</span>=<span class="hljs-string">"org.apache.druid.curator.inventory.CuratorInventoryManager"</span> <span class="hljs-attr">level</span>=<span class="hljs-string">"debug"</span> <span class="hljs-attr">additivity</span>=<span class="hljs-string">"false"</span>&gt;</span>
+      <span class="hljs-tag">&lt;<span class="hljs-name">AppenderRef</span> <span class="hljs-attr">ref</span>=<span class="hljs-string">"Console"</span>/&gt;</span>
+    <span class="hljs-tag">&lt;/<span class="hljs-name">AsyncLogger</span>&gt;</span>
+    <span class="hljs-tag">&lt;<span class="hljs-name">AsyncLogger</span> <span class="hljs-attr">name</span>=<span class="hljs-string">"org.apache.druid.client.BatchServerInventoryView"</span> <span class="hljs-attr">level</span>=<span class="hljs-string">"debug"</span> <span class="hljs-attr">additivity</span>=<span class="hljs-string">"false"</span>&gt;</span>
+      <span class="hljs-tag">&lt;<span class="hljs-name">AppenderRef</span> <span class="hljs-attr">ref</span>=<span class="hljs-string">"Console"</span>/&gt;</span>
+    <span class="hljs-tag">&lt;/<span class="hljs-name">AsyncLogger</span>&gt;</span>
+    <span class="hljs-comment">&lt;!-- Make extra sure nobody adds logs in a bad way that can hurt performance --&gt;</span>
+    <span class="hljs-tag">&lt;<span class="hljs-name">AsyncLogger</span> <span class="hljs-attr">name</span>=<span class="hljs-string">"org.apache.druid.client.ServerInventoryView"</span> <span class="hljs-attr">level</span>=<span class="hljs-string">"debug"</span> <span class="hljs-attr">additivity</span>=<span class="hljs-string">"false"</span>&gt;</span>
+      <span class="hljs-tag">&lt;<span class="hljs-name">AppenderRef</span> <span class="hljs-attr">ref</span>=<span class="hljs-string">"Console"</span>/&gt;</span>
+    <span class="hljs-tag">&lt;/<span class="hljs-name">AsyncLogger</span>&gt;</span>
+    <span class="hljs-tag">&lt;<span class="hljs-name">AsyncLogger</span> <span class="hljs-attr">name</span> =<span class="hljs-string">"org.apache.druid.java.util.http.client.pool.ChannelResourceFactory"</span> <span class="hljs-attr">level</span>=<span class="hljs-string">"info"</span> <span class="hljs-attr">additivity</span>=<span class="hljs-string">"false"</span>&gt;</span>
+      <span class="hljs-tag">&lt;<span class="hljs-name">AppenderRef</span> <span class="hljs-attr">ref</span>=<span class="hljs-string">"Console"</span>/&gt;</span>
+    <span class="hljs-tag">&lt;/<span class="hljs-name">AsyncLogger</span>&gt;</span>
+    <span class="hljs-tag">&lt;<span class="hljs-name">Root</span> <span class="hljs-attr">level</span>=<span class="hljs-string">"info"</span>&gt;</span>
+      <span class="hljs-tag">&lt;<span class="hljs-name">AppenderRef</span> <span class="hljs-attr">ref</span>=<span class="hljs-string">"Console"</span>/&gt;</span>
+    <span class="hljs-tag">&lt;/<span class="hljs-name">Root</span>&gt;</span>
+  <span class="hljs-tag">&lt;/<span class="hljs-name">Loggers</span>&gt;</span>
+<span class="hljs-tag">&lt;/<span class="hljs-name">Configuration</span>&gt;</span>
+</span></code></pre>
+</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/0.20.0/development/extensions.html"><span class="arrow-prev">← </span><span>Extensions</span></a><a class="docs-next button" href="/docs/0.20.0/operations/druid-console.html"><span>Web console</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#my-logs-are-really-chatty-can-i-set-them-to-asynchronously-write">My logs are really chatty, can I set them to asynchronously write?</a></li></ul></nav></div><footer class="nav-footer druid-footer" id="footer"><div class="container"><div class="text-center"><p><a href="/technology">Technology</a> · <a href="/use-cases">Use Cases</a> · <a href="/druid-powered">Powered by Druid</a> · <a href="/docs/0.20.0/latest">Docs</a> · <a href="/community/">Community</a> · <a href="/downloads.html">Download</a> · <a href="/faq">FAQ</a></p></div><div class="text-center"><a title="Join the user group" href="https://groups.google.com/forum/#!forum/druid-user" target="_blank"><span class="fa fa-comments"></span></a> · <a title="Follow Druid" href="https://twitter.com/druidio" target="_blank"><span class="fab fa-twitter"></span></a> · <a title="Download via Apache" href="https://www.apache.org/dyn/closer.cgi?path=/incubator/druid/{{ site.druid_versions[0].versions[0].version }}/apache-druid-{{ site.druid_versions[0].versions[0].version }}-bin.tar.gz" target="_blank"><span class="fas fa-feather"></span></a> · <a title="GitHub" href="https://github.com/apache/druid" target="_blank"><span class="fab fa-github"></span></a></div><div class="text-center license">Copyright © 2019 <a href="https://www.apache.org/" target="_blank">Apache Software Foundation</a>.<br/>Except where otherwise noted, licensed under <a rel="license" href="http://creativecommons.org/licenses/by-sa/4.0/">CC BY-SA 4.0</a>.<br/>Apache Druid, Druid, and the Druid logo are either registered trademarks or trademarks of The Apache Software Foundation in the United States and other countries.</div></div></footer></div><script type="text/javascript" src="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.js"></script><script>
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UIs</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/operations/deep-storage-migration.html">Deep storage migration</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/operations/export-metadata.html">Export Metadata Tool</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/operations/metadata-migration.html">Metadata Migration</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/operations/segment-optimization.html">Segment Size Optimization</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/operations/use_sbt_to_build_fat_jar.html">Content for build.sbt</a></li></ul></div></ul></div><div class="navGroup"><h3 class="navGroupCategoryTitle collapsible">Development<span class="arrow"><svg width="24" height="24" viewBox="0 0 24 24"><path fill="#565656" d="M7.41 15.41L12 10.83l4.59 4.58L18 14l-6-6-6 6z"></path><path d="M0 0h24v24H0z" fill="none"></path></svg></span></h3><ul class="hide"><li 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+        </script></nav></div><div class="container mainContainer docsContainer"><div class="wrapper"><div class="post"><header class="postHeader"><a class="edit-page-link button" href="https://github.com/apache/druid/edit/master/docs/dependencies/deep-storage.md" target="_blank" rel="noreferrer noopener">Edit</a><h1 id="__docusaurus" class="postHeaderTitle">Deep storage</h1></header><article><div><span><!--
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+<p>Deep storage is where segments are stored.  It is a storage mechanism that Apache Druid does not provide.  This deep storage infrastructure defines the level of durability of your data, as long as Druid processes can see this storage infrastructure and get at the segments stored on it, you will not lose data no matter how many Druid nodes you lose.  If segments disappear from this storage layer, then you will lose whatever data those segments represented.</p>
+<h2><a class="anchor" aria-hidden="true" id="local-mount"></a><a href="#local-mount" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Local Mount</h2>
+<p>A local mount can be used for storage of segments as well.  This allows you to use just your local file system or anything else that can be mount locally like NFS, Ceph, etc.  This is the default deep storage implementation.</p>
+<p>In order to use a local mount for deep storage, you need to set the following configuration in your common configs.</p>
+<table>
+<thead>
+<tr><th>Property</th><th>Possible Values</th><th>Description</th><th>Default</th></tr>
+</thead>
+<tbody>
+<tr><td><code>druid.storage.type</code></td><td>local</td><td></td><td>Must be set.</td></tr>
+<tr><td><code>druid.storage.storageDirectory</code></td><td></td><td>Directory for storing segments.</td><td>Must be set.</td></tr>
+</tbody>
+</table>
+<p>Note that you should generally set <code>druid.storage.storageDirectory</code> to something different from <code>druid.segmentCache.locations</code> and <code>druid.segmentCache.infoDir</code>.</p>
+<p>If you are using the Hadoop indexer in local mode, then just give it a local file as your output directory and it will work.</p>
+<h2><a class="anchor" aria-hidden="true" id="s3-compatible"></a><a href="#s3-compatible" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>S3-compatible</h2>
+<p>See <a href="/docs/0.20.0/development/extensions-core/s3.html">druid-s3-extensions extension documentation</a>.</p>
+<h2><a class="anchor" aria-hidden="true" id="hdfs"></a><a href="#hdfs" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>HDFS</h2>
+<p>See <a href="/docs/0.20.0/development/extensions-core/hdfs.html">druid-hdfs-storage extension documentation</a>.</p>
+<h2><a class="anchor" aria-hidden="true" id="additional-deep-stores"></a><a href="#additional-deep-stores" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Additional Deep Stores</h2>
+<p>For additional deep stores, please see our <a href="/docs/0.20.0/development/extensions.html">extensions list</a>.</p>
+</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/0.20.0/design/processes.html"><span class="arrow-prev">← </span><span>Processes and servers</span></a><a class="docs-next button" href="/docs/0.20.0/dependencies/metadata-storage.html"><span>Metadata storage</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#local-mount">Local Mount</a></li><li><a href="#s3-compatible">S3-compatible</a></li><li><a href="#hdfs">HDFS</a></li><li><a href="#additional-deep-stores">Additional Deep Stores</a></li></ul></nav></div><footer class="nav-footer druid-footer" id="footer"><div class="container"><div class="text-center"><p><a href="/technology">Technology</a> · <a href="/use-cases">Use Cases</a> · <a href="/druid-powered">Powered by Druid</a> · <a href="/docs/0.20.0/latest">Docs</a> · <a href="/community/">Community</a> · <a href="/downloads.html">Download</a> · <a href="/faq">FAQ</a></p></div><div class="text-center"><a title="Join the user group" href="https://groups.google.com/forum/#!forum/druid-user" target="_blank"><span class="fa fa-comments"></span></a> · <a title="Follow Druid" href="https://twitter.com/druidio" target="_blank"><span class="fab fa-twitter"></span></a> · <a title="Download via Apache" href="https://www.apache.org/dyn/closer.cgi?path=/incubator/druid/{{ site.druid_versions[0].versions[0].version }}/apache-druid-{{ site.druid_versions[0].versions[0].version }}-bin.tar.gz" target="_blank"><span class="fas fa-feather"></span></a> · <a title="GitHub" href="https://github.com/apache/druid" target="_blank"><span class="fab fa-github"></span></a></div><div class="text-center license">Copyright © 2019 <a href="https://www.apache.org/" target="_blank">Apache Software Foundation</a>.<br/>Except where otherwise noted, licensed under <a rel="license" href="http://creativecommons.org/licenses/by-sa/4.0/">CC BY-SA 4.0</a>.<br/>Apache Druid, Druid, and the Druid logo are either registered trademarks or trademarks of The Apache Software Foundation in the United States and other countries.</div></div></footer></div><script type="text/javascript" src="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.js"></script><script>
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+                if (!toggler) {
+                  return;
+                }
+
+                toggler.onclick = function(event) {
+                  event.preventDefault();
+
+                  target.classList.toggle(className);
+                };
+              }
+            });
+        </script></nav></div><div class="container mainContainer docsContainer"><div class="wrapper"><div class="post"><header class="postHeader"><a class="edit-page-link button" href="https://github.com/apache/druid/edit/master/docs/dependencies/metadata-storage.md" target="_blank" rel="noreferrer noopener">Edit</a><h1 id="__docusaurus" class="postHeaderTitle">Metadata storage</h1></header><article><div><span><!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+  -->
+<p>The Metadata Storage is an external dependency of Apache Druid. Druid uses it to store
+various metadata about the system, but not to store the actual data. There are
+a number of tables used for various purposes described below.</p>
+<p>Derby is the default metadata store for Druid, however, it is not suitable for production.
+<a href="/docs/0.20.0/development/extensions-core/mysql.html">MySQL</a> and <a href="/docs/0.20.0/development/extensions-core/postgresql.html">PostgreSQL</a> are more production suitable metadata stores.</p>
+<blockquote>
+<p>The Metadata Storage stores the entire metadata which is essential for a Druid cluster to work.
+For production clusters, consider using MySQL or PostgreSQL instead of Derby.
+Also, it's highly recommended to set up a high availability environment
+because there is no way to restore if you lose any metadata.</p>
+</blockquote>
+<h2><a class="anchor" aria-hidden="true" id="using-derby"></a><a href="#using-derby" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Using Derby</h2>
+<p>Add the following to your Druid configuration.</p>
+<pre><code class="hljs css language-properties"><span class="hljs-meta">druid.metadata.storage.type</span>=<span class="hljs-string">derby</span>
+<span class="hljs-meta">druid.metadata.storage.connector.connectURI</span>=<span class="hljs-string">jdbc:derby://localhost:1527//opt/var/druid_state/derby;create=true</span>
+</code></pre>
+<h2><a class="anchor" aria-hidden="true" id="mysql"></a><a href="#mysql" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>MySQL</h2>
+<p>See <a href="/docs/0.20.0/development/extensions-core/mysql.html">mysql-metadata-storage extension documentation</a>.</p>
+<h2><a class="anchor" aria-hidden="true" id="postgresql"></a><a href="#postgresql" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>PostgreSQL</h2>
+<p>See <a href="/docs/0.20.0/development/extensions-core/postgresql.html">postgresql-metadata-storage</a>.</p>
+<h2><a class="anchor" aria-hidden="true" id="adding-custom-dbcp-properties"></a><a href="#adding-custom-dbcp-properties" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Adding custom dbcp properties</h2>
+<p>NOTE: These properties are not settable through the <code>druid.metadata.storage.connector.dbcp properties</code>: <code>username</code>, <code>password</code>, <code>connectURI</code>, <code>validationQuery</code>, <code>testOnBorrow</code>. These must be set through <code>druid.metadata.storage.connector</code> properties.</p>
+<p>Example supported properties:</p>
+<pre><code class="hljs css language-properties"><span class="hljs-meta">druid.metadata.storage.connector.dbcp.maxConnLifetimeMillis</span>=<span class="hljs-string">1200000</span>
+<span class="hljs-meta">druid.metadata.storage.connector.dbcp.defaultQueryTimeout</span>=<span class="hljs-string">30000</span>
+</code></pre>
+<p>See <a href="https://commons.apache.org/proper/commons-dbcp/configuration.html">BasicDataSource Configuration</a> for full list.</p>
+<h2><a class="anchor" aria-hidden="true" id="metadata-storage-tables"></a><a href="#metadata-storage-tables" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Metadata storage tables</h2>
+<h3><a class="anchor" aria-hidden="true" id="segments-table"></a><a href="#segments-table" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Segments table</h3>
+<p>This is dictated by the <code>druid.metadata.storage.tables.segments</code> property.</p>
+<p>This table stores metadata about the segments that should be available in the system. (This set of segments is called
+&quot;used segments&quot; elsewhere in the documentation and throughout the project.) The table is polled by the
+<a href="/docs/0.20.0/design/coordinator.html">Coordinator</a> to determine the set of segments that should be available for querying in the
+system. The table has two main functional columns, the other columns are for indexing purposes.</p>
+<p>Value 1 in the <code>used</code> column means that the segment should be &quot;used&quot; by the cluster (i.e., it should be loaded and
+available for requests). Value 0 means that the segment should not be loaded into the cluster. We do this as a means of
+unloading segments from the cluster without actually removing their metadata (which allows for simpler rolling back if
+that is ever an issue).</p>
+<p>The <code>payload</code> column stores a JSON blob that has all of the metadata for the segment (some of the data stored in this payload is redundant with some of the columns in the table, that is intentional). This looks something like</p>
+<pre><code class="hljs css language-json">{
+ <span class="hljs-attr">"dataSource"</span>:<span class="hljs-string">"wikipedia"</span>,
+ <span class="hljs-attr">"interval"</span>:<span class="hljs-string">"2012-05-23T00:00:00.000Z/2012-05-24T00:00:00.000Z"</span>,
+ <span class="hljs-attr">"version"</span>:<span class="hljs-string">"2012-05-24T00:10:00.046Z"</span>,
+ <span class="hljs-attr">"loadSpec"</span>:{
+    <span class="hljs-attr">"type"</span>:<span class="hljs-string">"s3_zip"</span>,
+    <span class="hljs-attr">"bucket"</span>:<span class="hljs-string">"bucket_for_segment"</span>,
+    <span class="hljs-attr">"key"</span>:<span class="hljs-string">"path/to/segment/on/s3"</span>
+ },
+ <span class="hljs-attr">"dimensions"</span>:<span class="hljs-string">"comma-delimited-list-of-dimension-names"</span>,
+ <span class="hljs-attr">"metrics"</span>:<span class="hljs-string">"comma-delimited-list-of-metric-names"</span>,
+ <span class="hljs-attr">"shardSpec"</span>:{<span class="hljs-attr">"type"</span>:<span class="hljs-string">"none"</span>},
+ <span class="hljs-attr">"binaryVersion"</span>:<span class="hljs-number">9</span>,
+ <span class="hljs-attr">"size"</span>:size_of_segment,
+ <span class="hljs-attr">"identifier"</span>:<span class="hljs-string">"wikipedia_2012-05-23T00:00:00.000Z_2012-05-24T00:00:00.000Z_2012-05-23T00:10:00.046Z"</span>
+}
+</code></pre>
+<p>Note that the format of this blob can and will change from time-to-time.</p>
+<h3><a class="anchor" aria-hidden="true" id="rule-table"></a><a href="#rule-table" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Rule table</h3>
+<p>The rule table is used to store the various rules about where segments should
+land. These rules are used by the <a href="/docs/0.20.0/design/coordinator.html">Coordinator</a>
+when making segment (re-)allocation decisions about the cluster.</p>
+<h3><a class="anchor" aria-hidden="true" id="config-table"></a><a href="#config-table" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Config table</h3>
+<p>The config table is used to store runtime configuration objects. We do not have
+many of these yet and we are not sure if we will keep this mechanism going
+forward, but it is the beginnings of a method of changing some configuration
+parameters across the cluster at runtime.</p>
+<h3><a class="anchor" aria-hidden="true" id="task-related-tables"></a><a href="#task-related-tables" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Task-related tables</h3>
+<p>There are also a number of tables created and used by the <a href="/docs/0.20.0/design/overlord.html">Overlord</a> and <a href="/docs/0.20.0/design/middlemanager.html">MiddleManager</a> when managing tasks.</p>
+<h3><a class="anchor" aria-hidden="true" id="audit-table"></a><a href="#audit-table" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Audit table</h3>
+<p>The Audit table is used to store the audit history for configuration changes
+e.g rule changes done by <a href="/docs/0.20.0/design/coordinator.html">Coordinator</a> and other
+config changes.</p>
+<p>##Accessed by: ##</p>
+<p>The Metadata Storage is accessed only by:</p>
+<ol>
+<li>Indexing Service Processes (if any)</li>
+<li>Realtime Processes (if any)</li>
+<li>Coordinator Processes</li>
+</ol>
+<p>Thus you need to give permissions (e.g., in AWS Security Groups) only for these machines to access the Metadata storage.</p>
+</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/0.20.0/dependencies/deep-storage.html"><span class="arrow-prev">← </span><span>Deep storage</span></a><a class="docs-next button" href="/docs/0.20.0/dependencies/zookeeper.html"><span class="function-name-prevnext">ZooKeeper</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#using-derby">Using Derby</a></li><li><a href="#mysql">MySQL</a></li><li><a href="#postgresql">PostgreSQL</a></li><li><a href="#adding-custom-dbcp-properties">Adding custom dbcp properties</a></li><li><a href="#metadata-storage-tables">Metadata storage tables</a><ul class="toc-headings"><li><a href="#segments-table">Segments table</a></li><li><a href="#rule-table">Rule table</a></li><li><a href="#config-table">Config table</a></li><li><a href="#task-related-tables">Task-related tables</a></li><li><a href="#audit-table">Audit table</a></li></ul></li></ul></nav></div><footer class="nav-footer druid-footer" id="footer"><div class="container"><div class="text-center"><p><a href="/technology">Technology</a> · <a href="/use-cases">Use Cases</a> · <a href="/druid-powered">Powered by Druid</a> · <a href="/docs/0.20.0/latest">Docs</a> · <a href="/community/">Community</a> · <a href="/downloads.html">Download</a> · <a href="/faq">FAQ</a></p></div><div class="text-center"><a title="Join the user group" href="https://groups.google.com/forum/#!forum/druid-user" target="_blank"><span class="fa fa-comments"></span></a> · <a title="Follow Druid" href="https://twitter.com/druidio" target="_blank"><span class="fab fa-twitter"></span></a> · <a title="Download via Apache" href="https://www.apache.org/dyn/closer.cgi?path=/incubator/druid/{{ site.druid_versions[0].versions[0].version }}/apache-druid-{{ site.druid_versions[0].versions[0].version }}-bin.tar.gz" target="_blank"><span class="fas fa-feather"></span></a> · <a title="GitHub" href="https://github.com/apache/druid" target="_blank"><span class="fab fa-github"></span></a></div><div class="text-center license">Copyright © 2019 <a href="https://www.apache.org/" target="_blank">Apache Software Foundation</a>.<br/>Except where otherwise noted, licensed under <a rel="license" href="http://creativecommons.org/licenses/by-sa/4.0/">CC BY-SA 4.0</a>.<br/>Apache Druid, Druid, and the Druid logo are either registered trademarks or trademarks of The Apache Software Foundation in the United States and other countries.</div></div></footer></div><script type="text/javascript" src="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.js"></script><script>
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+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>ZooKeeper · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/0.20.0/dependencies/zookeeper.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.20.0" /><meta property="og:title" content="ZooKeeper · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
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UIs</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/operations/deep-storage-migration.html">Deep storage migration</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/operations/export-metadata.html">Export Metadata Tool</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/operations/metadata-migration.html">Metadata Migration</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/operations/segment-optimization.html">Segment Size Optimization</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/operations/use_sbt_to_build_fat_jar.html">Content for build.sbt</a></li></ul></div></ul></div><div class="navGroup"><h3 class="navGroupCategoryTitle collapsible">Development<span class="arrow"><svg width="24" height="24" viewBox="0 0 24 24"><path fill="#565656" d="M7.41 15.41L12 10.83l4.59 4.58L18 14l-6-6-6 6z"></path><path d="M0 0h24v24H0z" fill="none"></path></svg></span></h3><ul class="hide"><li 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+        </script></nav></div><div class="container mainContainer docsContainer"><div class="wrapper"><div class="post"><header class="postHeader"><a class="edit-page-link button" href="https://github.com/apache/druid/edit/master/docs/dependencies/zookeeper.md" target="_blank" rel="noreferrer noopener">Edit</a><h1 id="__docusaurus" class="postHeaderTitle">ZooKeeper</h1></header><article><div><span><!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
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+  ~   http://www.apache.org/licenses/LICENSE-2.0
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+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+  -->
+<p>Apache Druid uses <a href="http://zookeeper.apache.org/">Apache ZooKeeper</a> (ZK) for management of current cluster state. The operations that happen over ZK are</p>
+<ol>
+<li><a href="/docs/0.20.0/design/coordinator.html">Coordinator</a> leader election</li>
+<li>Segment &quot;publishing&quot; protocol from <a href="/docs/0.20.0/design/historical.html">Historical</a></li>
+<li>Segment load/drop protocol between <a href="/docs/0.20.0/design/coordinator.html">Coordinator</a> and <a href="/docs/0.20.0/design/historical.html">Historical</a></li>
+<li><a href="/docs/0.20.0/design/overlord.html">Overlord</a> leader election</li>
+<li><a href="/docs/0.20.0/design/overlord.html">Overlord</a> and <a href="/docs/0.20.0/design/middlemanager.html">MiddleManager</a> task management</li>
+</ol>
+<h2><a class="anchor" aria-hidden="true" id="coordinator-leader-election"></a><a href="#coordinator-leader-election" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Coordinator Leader Election</h2>
+<p>We use the Curator LeadershipLatch recipe to do leader election at path</p>
+<pre><code class="hljs">${druid<span class="hljs-selector-class">.zk</span><span class="hljs-selector-class">.paths</span>.coordinatorPath}/_COORDINATOR
+</code></pre>
+<h2><a class="anchor" aria-hidden="true" id="segment-publishing-protocol-from-historical-and-realtime"></a><a href="#segment-publishing-protocol-from-historical-and-realtime" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Segment &quot;publishing&quot; protocol from Historical and Realtime</h2>
+<p>The <code>announcementsPath</code> and <code>servedSegmentsPath</code> are used for this.</p>
+<p>All <a href="/docs/0.20.0/design/historical.html">Historical</a> processes publish themselves on the <code>announcementsPath</code>, specifically, they will create an ephemeral znode at</p>
+<pre><code class="hljs"><span class="hljs-variable">${druid.zk.paths.announcementsPath}</span>/<span class="hljs-variable">${druid.host}</span>
+</code></pre>
+<p>Which signifies that they exist. They will also subsequently create a permanent znode at</p>
+<pre><code class="hljs"><span class="hljs-variable">${druid.zk.paths.servedSegmentsPath}</span>/<span class="hljs-variable">${druid.host}</span>
+</code></pre>
+<p>And as they load up segments, they will attach ephemeral znodes that look like</p>
+<pre><code class="hljs"><span class="hljs-variable">${druid.zk.paths.servedSegmentsPath}</span><span class="hljs-regexp">/${druid.host}/</span>_segment_identifier_
+</code></pre>
+<p>Processes like the <a href="/docs/0.20.0/design/coordinator.html">Coordinator</a> and <a href="/docs/0.20.0/design/broker.html">Broker</a> can then watch these paths to see which processes are currently serving which segments.</p>
+<h2><a class="anchor" aria-hidden="true" id="segment-loaddrop-protocol-between-coordinator-and-historical"></a><a href="#segment-loaddrop-protocol-between-coordinator-and-historical" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Segment load/drop protocol between Coordinator and Historical</h2>
+<p>The <code>loadQueuePath</code> is used for this.</p>
+<p>When the <a href="/docs/0.20.0/design/coordinator.html">Coordinator</a> decides that a <a href="/docs/0.20.0/design/historical.html">Historical</a> process should load or drop a segment, it writes an ephemeral znode to</p>
+<pre><code class="hljs"><span class="hljs-variable">${druid.zk.paths.loadQueuePath}</span><span class="hljs-regexp">/_host_of_historical_process/</span>_segment_identifier
+</code></pre>
+<p>This znode will contain a payload that indicates to the Historical process what it should do with the given segment. When the Historical process is done with the work, it will delete the znode in order to signify to the Coordinator that it is complete.</p>
+</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/0.20.0/dependencies/metadata-storage.html"><span class="arrow-prev">← </span><span>Metadata storage</span></a><a class="docs-next button" href="/docs/0.20.0/ingestion/index.html"><span>Ingestion</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#coordinator-leader-election">Coordinator Leader Election</a></li><li><a href="#segment-publishing-protocol-from-historical-and-realtime">Segment &quot;publishing&quot; protocol from Historical and Realtime</a></li><li><a href="#segment-loaddrop-protocol-between-coordinator-and-historical">Segment load/drop protocol between Coordinator and Historical</a></li></ul></nav></div><footer class="nav-footer druid-footer" id="footer"><div class="container"><div class="text-center"><p><a href="/technology">Technology</a> · <a href="/use-cases">Use Cases</a> · <a href="/druid-powered">Powered by Druid</a> · <a href="/docs/0.20.0/latest">Docs</a> · <a href="/community/">Community</a> · <a href="/downloads.html">Download</a> · <a href="/faq">FAQ</a></p></div><div class="text-center"><a title="Join the user group" href="https://groups.google.com/forum/#!forum/druid-user" target="_blank"><span class="fa fa-comments"></span></a> · <a title="Follow Druid" href="https://twitter.com/druidio" target="_blank"><span class="fab fa-twitter"></span></a> · <a title="Download via Apache" href="https://www.apache.org/dyn/closer.cgi?path=/incubator/druid/{{ site.druid_versions[0].versions[0].version }}/apache-druid-{{ site.druid_versions[0].versions[0].version }}-bin.tar.gz" target="_blank"><span class="fas fa-feather"></span></a> · <a title="GitHub" href="https://github.com/apache/druid" target="_blank"><span class="fab fa-github"></span></a></div><div class="text-center license">Copyright © 2019 <a href="https://www.apache.org/" target="_blank">Apache Software Foundation</a>.<br/>Except where otherwise noted, licensed under <a rel="license" href="http://creativecommons.org/licenses/by-sa/4.0/">CC BY-SA 4.0</a>.<br/>Apache Druid, Druid, and the Druid logo are either registered trademarks or trademarks of The Apache Software Foundation in the United States and other countries.</div></div></footer></div><script type="text/javascript" src="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.js"></script><script>
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class="icon-toc"></i></div></div><div class="navGroups"><div class="navGroup"><h3 class="navGroupCategoryTitle collapsible">Getting started<span class="arrow"><svg width="24" height="24" viewBox="0 0 24 24"><path fill="#565656" d="M7.41 15.41L12 10.83l4.59 4.58L18 14l-6-6-6 6z"></path><path d="M0 0h24v24H0z" fill="none"></path></svg></span></h3><ul class="hide"><li class="navListItem"><a class="navItem" href="/docs/0.20.0/design/index.html">Introduction to Apache Druid</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/tutorials/index.html">Quickstart</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/tutorials/docker.html">Docker</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/operations/single-server.html">Single server deployment</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/tutorials/cluster.html">Clustered deployment</a></li></ul></div><div class="navGroup"><h3 class="navGroupCategoryTitle 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+<p>Druid has a multi-process, distributed architecture that is designed to be cloud-friendly and easy to operate. Each
+Druid process type can be configured and scaled independently, giving you maximum flexibility over your cluster. This
+design also provides enhanced fault tolerance: an outage of one component will not immediately affect other components.</p>
+<h2><a class="anchor" aria-hidden="true" id="processes-and-servers"></a><a href="#processes-and-servers" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Processes and Servers</h2>
+<p>Druid has several process types, briefly described below:</p>
+<ul>
+<li><a href="/docs/0.20.0/design/coordinator.html"><strong>Coordinator</strong></a> processes manage data availability on the cluster.</li>
+<li><a href="/docs/0.20.0/design/overlord.html"><strong>Overlord</strong></a> processes control the assignment of data ingestion workloads.</li>
+<li><a href="/docs/0.20.0/design/broker.html"><strong>Broker</strong></a> processes handle queries from external clients.</li>
+<li><a href="/docs/0.20.0/design/router.html"><strong>Router</strong></a> processes are optional processes that can route requests to Brokers, Coordinators, and Overlords.</li>
+<li><a href="/docs/0.20.0/design/historical.html"><strong>Historical</strong></a> processes store queryable data.</li>
+<li><a href="/docs/0.20.0/design/middlemanager.html"><strong>MiddleManager</strong></a> processes are responsible for ingesting data.</li>
+</ul>
+<p>Druid processes can be deployed any way you like, but for ease of deployment we suggest organizing them into three server types: Master, Query, and Data.</p>
+<ul>
+<li><strong>Master</strong>: Runs Coordinator and Overlord processes, manages data availability and ingestion.</li>
+<li><strong>Query</strong>: Runs Broker and optional Router processes, handles queries from external clients.</li>
+<li><strong>Data</strong>: Runs Historical and MiddleManager processes, executes ingestion workloads and stores all queryable data.</li>
+</ul>
+<p>For more details on process and server organization, please see <a href="/docs/0.20.0/design/processes.html">Druid Processes and Servers</a>.</p>
+<h2><a class="anchor" aria-hidden="true" id="external-dependencies"></a><a href="#external-dependencies" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>External dependencies</h2>
+<p>In addition to its built-in process types, Druid also has three external dependencies. These are intended to be able to
+leverage existing infrastructure, where present.</p>
+<h3><a class="anchor" aria-hidden="true" id="deep-storage"></a><a href="#deep-storage" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Deep storage</h3>
+<p>Shared file storage accessible by every Druid server. In a clustered deployment, this is typically going to
+be a distributed object store like S3 or HDFS, or a network mounted filesystem. In a single-server deployment,
+this is typically going to be local disk. Druid uses deep storage to store any data that has been ingested into the
+system.</p>
+<p>Druid uses deep storage only as a backup of your data and as a way to transfer data in the background between
+Druid processes. To respond to queries, Historical processes do not read from deep storage, but instead read prefetched
+segments from their local disks before any queries are served. This means that Druid never needs to access deep storage
+during a query, helping it offer the best query latencies possible. It also means that you must have enough disk space
+both in deep storage and across your Historical processes for the data you plan to load.</p>
+<p>Deep storage is an important part of Druid's elastic, fault-tolerant design. Druid can bootstrap from deep storage even
+if every single data server is lost and re-provisioned.</p>
+<p>For more details, please see the <a href="/docs/0.20.0/dependencies/deep-storage.html">Deep storage</a> page.</p>
+<h3><a class="anchor" aria-hidden="true" id="metadata-storage"></a><a href="#metadata-storage" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Metadata storage</h3>
+<p>The metadata storage holds various shared system metadata such as segment usage information and task information. In a
+clustered deployment, this is typically going to be a traditional RDBMS like PostgreSQL or MySQL. In a single-server
+deployment, it is typically going to be a locally-stored Apache Derby database.</p>
+<p>For more details, please see the <a href="/docs/0.20.0/dependencies/metadata-storage.html">Metadata storage</a> page.</p>
+<h3><a class="anchor" aria-hidden="true" id="zookeeper"></a><a href="#zookeeper" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>ZooKeeper</h3>
+<p>Used for internal service discovery, coordination, and leader election.</p>
+<p>For more details, please see the <a href="/docs/0.20.0/dependencies/zookeeper.html">ZooKeeper</a> page.</p>
+<h2><a class="anchor" aria-hidden="true" id="architecture-diagram"></a><a href="#architecture-diagram" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Architecture diagram</h2>
+<p>The following diagram shows how queries and data flow through this architecture, using the suggested Master/Query/Data server organization:</p>
+<p><img src="../assets/druid-architecture.png" width="800"/></p>
+<h2><a class="anchor" aria-hidden="true" id="storage-design"></a><a href="#storage-design" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Storage design</h2>
+<h3><a class="anchor" aria-hidden="true" id="datasources-and-segments"></a><a href="#datasources-and-segments" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Datasources and segments</h3>
+<p>Druid data is stored in &quot;datasources&quot;, which are similar to tables in a traditional RDBMS. Each datasource is
+partitioned by time and, optionally, further partitioned by other attributes. Each time range is called a &quot;chunk&quot; (for
+example, a single day, if your datasource is partitioned by day). Within a chunk, data is partitioned into one or more
+<a href="/docs/0.20.0/design/segments.html">&quot;segments&quot;</a>. Each segment is a single file, typically comprising up to a few million rows of data. Since segments are
+organized into time chunks, it's sometimes helpful to think of segments as living on a timeline like the following:</p>
+<p><img src="../assets/druid-timeline.png" width="800" /></p>
+<p>A datasource may have anywhere from just a few segments, up to hundreds of thousands and even millions of segments. Each
+segment starts life off being created on a MiddleManager, and at that point, is mutable and uncommitted. The segment
+building process includes the following steps, designed to produce a data file that is compact and supports fast
+queries:</p>
+<ul>
+<li>Conversion to columnar format</li>
+<li>Indexing with bitmap indexes</li>
+<li>Compression using various algorithms
+<ul>
+<li>Dictionary encoding with id storage minimization for String columns</li>
+<li>Bitmap compression for bitmap indexes</li>
+<li>Type-aware compression for all columns</li>
+</ul></li>
+</ul>
+<p>Periodically, segments are committed and published. At this point, they are written to <a href="#deep-storage">deep storage</a>,
+become immutable, and move from MiddleManagers to the Historical processes. An entry about the segment is also written
+to the <a href="#metadata-storage">metadata store</a>. This entry is a self-describing bit of metadata about the segment, including
+things like the schema of the segment, its size, and its location on deep storage. These entries are what the
+Coordinator uses to know what data <em>should</em> be available on the cluster.</p>
+<p>For details on the segment file format, please see <a href="segments.html">segment files</a>.</p>
+<p>For details on modeling your data in Druid, see <a href="/docs/0.20.0/ingestion/schema-design.html">schema design</a>.</p>
+<h3><a class="anchor" aria-hidden="true" id="indexing-and-handoff"></a><a href="#indexing-and-handoff" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Indexing and handoff</h3>
+<p><em>Indexing</em> is the mechanism by which new segments are created, and <em>handoff</em> is the mechanism by which they are published
+and begin being served by Historical processes. The mechanism works like this on the indexing side:</p>
+<ol>
+<li>An <em>indexing task</em> starts running and building a new segment. It must determine the identifier of the segment before
+it starts building it. For a task that is appending (like a Kafka task, or an index task in append mode) this will be
+done by calling an &quot;allocate&quot; API on the Overlord to potentially add a new partition to an existing set of segments. For
+a task that is overwriting (like a Hadoop task, or an index task <em>not</em> in append mode) this is done by locking an
+interval and creating a new version number and new set of segments.</li>
+<li>If the indexing task is a realtime task (like a Kafka task) then the segment is immediately queryable at this point.
+It's available, but unpublished.</li>
+<li>When the indexing task has finished reading data for the segment, it pushes it to deep storage and then publishes it
+by writing a record into the metadata store.</li>
+<li>If the indexing task is a realtime task, at this point it waits for a Historical process to load the segment. If the
+indexing task is not a realtime task, it exits immediately.</li>
+</ol>
+<p>And like this on the Coordinator / Historical side:</p>
+<ol>
+<li>The Coordinator polls the metadata store periodically (by default, every 1 minute) for newly published segments.</li>
+<li>When the Coordinator finds a segment that is published and used, but unavailable, it chooses a Historical process
+to load that segment and instructs that Historical to do so.</li>
+<li>The Historical loads the segment and begins serving it.</li>
+<li>At this point, if the indexing task was waiting for handoff, it will exit.</li>
+</ol>
+<h3><a class="anchor" aria-hidden="true" id="segment-identifiers"></a><a href="#segment-identifiers" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Segment identifiers</h3>
+<p>Segments all have a four-part identifier with the following components:</p>
+<ul>
+<li>Datasource name.</li>
+<li>Time interval (for the time chunk containing the segment; this corresponds to the <code>segmentGranularity</code> specified
+at ingestion time).</li>
+<li>Version number (generally an ISO8601 timestamp corresponding to when the segment set was first started).</li>
+<li>Partition number (an integer, unique within a datasource+interval+version; may not necessarily be contiguous).</li>
+</ul>
+<p>For example, this is the identifier for a segment in datasource <code>clarity-cloud0</code>, time chunk
+<code>2018-05-21T16:00:00.000Z/2018-05-21T17:00:00.000Z</code>, version <code>2018-05-21T15:56:09.909Z</code>, and partition number 1:</p>
+<pre><code class="hljs">clarity-cloud0_2018<span class="hljs-number">-05</span><span class="hljs-number">-21</span>T16:<span class="hljs-number">00</span>:<span class="hljs-number">00.000</span>Z_2018<span class="hljs-number">-05</span><span class="hljs-number">-21</span>T17:<span class="hljs-number">00</span>:<span class="hljs-number">00.000</span>Z_2018<span class="hljs-number">-05</span><span class="hljs-number">-21</span>T15:<span class="hljs-number">56</span>:<span class="hljs-number">09.909</span>Z_1
+</code></pre>
+<p>Segments with partition number 0 (the first partition in a chunk) omit the partition number, like the following
+example, which is a segment in the same time chunk as the previous one, but with partition number 0 instead of 1:</p>
+<pre><code class="hljs">clarity-cloud0_2018<span class="hljs-number">-05</span><span class="hljs-number">-21</span>T16:<span class="hljs-number">00</span>:<span class="hljs-number">00.000</span>Z_2018<span class="hljs-number">-05</span><span class="hljs-number">-21</span>T17:<span class="hljs-number">00</span>:<span class="hljs-number">00.000</span>Z_2018<span class="hljs-number">-05</span><span class="hljs-number">-21</span>T15:<span class="hljs-number">56</span>:<span class="hljs-number">09.909</span>Z
+</code></pre>
+<h3><a class="anchor" aria-hidden="true" id="segment-versioning"></a><a href="#segment-versioning" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Segment versioning</h3>
+<p>You may be wondering what the &quot;version number&quot; described in the previous section is for. Or, you might not be, in which
+case good for you and you can skip this section!</p>
+<p>It's there to support batch-mode overwriting. In Druid, if all you ever do is append data, then there will be just a
+single version for each time chunk. But when you overwrite data, what happens behind the scenes is that a new set of
+segments is created with the same datasource, same time interval, but a higher version number. This is a signal to the
+rest of the Druid system that the older version should be removed from the cluster, and the new version should replace
+it.</p>
+<p>The switch appears to happen instantaneously to a user, because Druid handles this by first loading the new data (but
+not allowing it to be queried), and then, as soon as the new data is all loaded, switching all new queries to use those
+new segments. Then it drops the old segments a few minutes later.</p>
+<h3><a class="anchor" aria-hidden="true" id="segment-lifecycle"></a><a href="#segment-lifecycle" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Segment lifecycle</h3>
+<p>Each segment has a lifecycle that involves the following three major areas:</p>
+<ol>
+<li><strong>Metadata store:</strong> Segment metadata (a small JSON payload generally no more than a few KB) is stored in the
+<a href="/docs/0.20.0/dependencies/metadata-storage.html">metadata store</a> once a segment is done being constructed. The act of inserting
+a record for a segment into the metadata store is called <em>publishing</em>. These metadata records have a boolean flag
+named <code>used</code>, which controls whether the segment is intended to be queryable or not. Segments created by realtime tasks will be
+available before they are published, since they are only published when the segment is complete and will not accept
+any additional rows of data.</li>
+<li><strong>Deep storage:</strong> Segment data files are pushed to deep storage once a segment is done being constructed. This
+happens immediately before publishing metadata to the metadata store.</li>
+<li><strong>Availability for querying:</strong> Segments are available for querying on some Druid data server, like a realtime task
+or a Historical process.</li>
+</ol>
+<p>You can inspect the state of currently active segments using the Druid SQL
+<a href="/docs/0.20.0/querying/sql.html#segments-table"><code>sys.segments</code> table</a>. It includes the following flags:</p>
+<ul>
+<li><code>is_published</code>: True if segment metadata has been published to the metadata store and <code>used</code> is true.</li>
+<li><code>is_available</code>: True if the segment is currently available for querying, either on a realtime task or Historical
+process.</li>
+<li><code>is_realtime</code>: True if the segment is <em>only</em> available on realtime tasks. For datasources that use realtime ingestion,
+this will generally start off <code>true</code> and then become <code>false</code> as the segment is published and handed off.</li>
+<li><code>is_overshadowed</code>: True if the segment is published (with <code>used</code> set to true) and is fully overshadowed by some other
+published segments. Generally this is a transient state, and segments in this state will soon have their <code>used</code> flag
+automatically set to false.</li>
+</ul>
+<h3><a class="anchor" aria-hidden="true" id="availability-and-consistency"></a><a href="#availability-and-consistency" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Availability and consistency</h3>
+<p>Druid has an architectural separation between ingestion and querying, as described above in
+<a href="#indexing-and-handoff">Indexing and handoff</a>. This means that when understanding Druid's availability and
+consistency properties, we must look at each function separately.</p>
+<p>On the <strong>ingestion side</strong>, Druid's primary <a href="/docs/0.20.0/ingestion/index.html#ingestion-methods">ingestion methods</a> are all
+pull-based and offer transactional guarantees. This means that you are guaranteed that ingestion using these will
+publish in an all-or-nothing manner:</p>
+<ul>
+<li>Supervised &quot;seekable-stream&quot; ingestion methods like <a href="/docs/0.20.0/development/extensions-core/kafka-ingestion.html">Kafka</a> and
+<a href="/docs/0.20.0/development/extensions-core/kinesis-ingestion.html">Kinesis</a>. With these methods, Druid commits stream offsets to its
+<a href="#metadata-storage">metadata store</a> alongside segment metadata, in the same transaction. Note that ingestion of data
+that has not yet been published can be rolled back if ingestion tasks fail. In this case, partially-ingested data is
+discarded, and Druid will resume ingestion from the last committed set of stream offsets. This ensures exactly-once
+publishing behavior.</li>
+<li><a href="../ingestion/hadoop.html">Hadoop-based batch ingestion</a>. Each task publishes all segment metadata in a single
+transaction.</li>
+<li><a href="../ingestion/native-batch.html">Native batch ingestion</a>. In parallel mode, the supervisor task publishes all segment
+metadata in a single transaction after the subtasks are finished. In simple (single-task) mode, the single task
+publishes all segment metadata in a single transaction after it is complete.</li>
+</ul>
+<p><a href="/docs/0.20.0/ingestion/tranquility.html">Tranquility</a>, a streaming ingestion method that is no longer recommended, does not perform
+transactional loading.</p>
+<p>Additionally, some ingestion methods offer an <em>idempotency</em> guarantee. This means that repeated executions of the same
+ingestion will not cause duplicate data to be ingested:</p>
+<ul>
+<li>Supervised &quot;seekable-stream&quot; ingestion methods like <a href="/docs/0.20.0/development/extensions-core/kafka-ingestion.html">Kafka</a> and
+<a href="/docs/0.20.0/development/extensions-core/kinesis-ingestion.html">Kinesis</a> are idempotent due to the fact that stream offsets and
+segment metadata are stored together and updated in lock-step.</li>
+<li><a href="../ingestion/hadoop.html">Hadoop-based batch ingestion</a> is idempotent unless one of your input sources
+is the same Druid datasource that you are ingesting into. In this case, running the same task twice is non-idempotent,
+because you are adding to existing data instead of overwriting it.</li>
+<li><a href="../ingestion/native-batch.html">Native batch ingestion</a> is idempotent unless
+<a href="../ingestion/native-batch.html"><code>appendToExisting</code></a> is true, or one of your input sources is the same Druid datasource
+that you are ingesting into. In either of these two cases, running the same task twice is non-idempotent, because you
+are adding to existing data instead of overwriting it.</li>
+</ul>
+<p>On the <strong>query side</strong>, the Druid Broker is responsible for ensuring that a consistent set of segments is involved in a
+given query. It selects the appropriate set of segments to use when the query starts based on what is currently
+available. This is supported by <em>atomic replacement</em>, a feature that ensures that from a user's perspective, queries
+flip instantaneously from an older set of data to a newer set of data, with no consistency or performance impact.
+This is used for Hadoop-based batch ingestion, native batch ingestion when <code>appendToExisting</code> is false, and compaction.</p>
+<p>Note that atomic replacement happens for each time chunk individually. If a batch ingestion task or compaction
+involves multiple time chunks, then each time chunk will undergo atomic replacement soon after the task finishes, but
+the replacements will not all happen simultaneously.</p>
+<p>Typically, atomic replacement in Druid is based on a <em>core set</em> concept that works in conjunction with segment versions.
+When a time chunk is overwritten, a new core set of segments is created with a higher version number. The core set
+must <em>all</em> be available before the Broker will use them instead of the older set. There can also only be one core set
+per version per time chunk. Druid will also only use a single version at a time per time chunk. Together, these
+properties provide Druid's atomic replacement guarantees.</p>
+<p>Druid also supports an experimental <em>segment locking</em> mode that is activated by setting
+<a href="/docs/0.20.0/ingestion/tasks.html#context"><code>forceTimeChunkLock</code></a> to false in the context of an ingestion task. In this case, Druid
+creates an <em>atomic update group</em> using the existing version for the time chunk, instead of creating a new core set
+with a new version number. There can be multiple atomic update groups with the same version number per time chunk. Each
+one replaces a specific set of earlier segments in the same time chunk and with the same version number. Druid will
+query the latest one that is fully available. This is a more powerful version of the core set concept, because it
+enables atomically replacing a subset of data for a time chunk, as well as doing atomic replacement and appending
+simultaneously.</p>
+<p>If segments become unavailable due to multiple Historicals going offline simultaneously (beyond your replication
+factor), then Druid queries will include only the segments that are still available. In the background, Druid will
+reload these unavailable segments on other Historicals as quickly as possible, at which point they will be included in
+queries again.</p>
+<h2><a class="anchor" aria-hidden="true" id="query-processing"></a><a href="#query-processing" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Query processing</h2>
+<p>Queries first enter the <a href="/docs/0.20.0/design/broker.html">Broker</a>, where the Broker will identify which segments have data that may pertain to that query.
+The list of segments is always pruned by time, and may also be pruned by other attributes depending on how your
+datasource is partitioned. The Broker will then identify which <a href="/docs/0.20.0/design/historical.html">Historicals</a> and
+<a href="/docs/0.20.0/design/middlemanager.html">MiddleManagers</a> are serving those segments and send a rewritten subquery to each of those processes. The Historical/MiddleManager processes will take in the
+queries, process them and return results. The Broker receives results and merges them together to get the final answer,
+which it returns to the original caller.</p>
+<p>Broker pruning is an important way that Druid limits the amount of data that must be scanned for each query, but it is
+not the only way. For filters at a more granular level than what the Broker can use for pruning, indexing structures
+inside each segment allow Druid to figure out which (if any) rows match the filter set before looking at any row of
+data. Once Druid knows which rows match a particular query, it only accesses the specific columns it needs for that
+query. Within those columns, Druid can skip from row to row, avoiding reading data that doesn't match the query filter.</p>
+<p>So Druid uses three different techniques to maximize query performance:</p>
+<ul>
+<li>Pruning which segments are accessed for each query.</li>
+<li>Within each segment, using indexes to identify which rows must be accessed.</li>
+<li>Within each segment, only reading the specific rows and columns that are relevant to a particular query.</li>
+</ul>
+<p>For more details about how Druid executes queries, refer to the <a href="/docs/0.20.0/querying/query-execution.html">Query execution</a>
+documentation.</p>
+</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/0.20.0/tutorials/tutorial-kerberos-hadoop.html"><span class="arrow-prev">← </span><span>Kerberized HDFS deep storage</span></a><a class="docs-next button" href="/docs/0.20.0/design/segments.html"><span>Segments</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#processes-and-servers">Processes and Servers</a></li><li><a href="#external-dependencies">External dependencies</a><ul class="toc-headings"><li><a href="#deep-storage">Deep storage</a></li><li><a href="#metadata-storage">Metadata storage</a></li><li><a href="#zookeeper">ZooKeeper</a></li></ul></li><li><a href="#architecture-diagram">Architecture diagram</a></li><li><a href="#storage-design">Storage design</a><ul class="toc-headings"><li><a href="#datasources-and-segments">Datasources and segments</a></li><li><a href="#indexing-and-handoff">Indexing and handoff</a></li><li><a href="#segment-identifiers">Segment identifiers</a></li><li><a href="#segment-versioning">Segment versioning</a></li><li><a href="#segment-lifecycle">Segment lifecycle</a></li><li><a href="#availability-and-consistency">Availability and consistency</a></li></ul></li><li><a href="#query-processing">Query processing</a></li></ul></nav></div><footer class="nav-footer druid-footer" id="footer"><div class="container"><div class="text-center"><p><a href="/technology">Technology</a> · <a href="/use-cases">Use Cases</a> · <a href="/druid-powered">Powered by Druid</a> · <a href="/docs/0.20.0/latest">Docs</a> · <a href="/community/">Community</a> · <a href="/downloads.html">Download</a> · <a href="/faq">FAQ</a></p></div><div class="text-center"><a title="Join the user group" href="https://groups.google.com/forum/#!forum/druid-user" target="_blank"><span class="fa fa-comments"></span></a> · <a title="Follow Druid" href="https://twitter.com/druidio" target="_blank"><span class="fab fa-twitter"></span></a> · <a title="Download via Apache" href="https://www.apache.org/dyn/closer.cgi?path=/incubator/druid/{{ site.druid_versions[0].versions[0].version }}/apache-druid-{{ site.druid_versions[0].versions[0].version }}-bin.tar.gz" target="_blank"><span class="fas fa-feather"></span></a> · <a title="GitHub" href="https://github.com/apache/druid" target="_blank"><span class="fab fa-github"></span></a></div><div class="text-center license">Copyright © 2019 <a href="https://www.apache.org/" target="_blank">Apache Software Foundation</a>.<br/>Except where otherwise noted, licensed under <a rel="license" href="http://creativecommons.org/licenses/by-sa/4.0/">CC BY-SA 4.0</a>.<br/>Apache Druid, Druid, and the Druid logo are either registered trademarks or trademarks of The Apache Software Foundation in the United States and other countries.</div></div></footer></div><script type="text/javascript" src="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.js"></script><script>
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+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Authentication and Authorization · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/0.20.0/design/auth.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.20.0" /><meta property="og:title" content="Authentication and Authorization · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
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+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+  -->
+<p>This document describes non-extension specific Apache Druid authentication and authorization configurations.</p>
+<table>
+<thead>
+<tr><th>Property</th><th>Type</th><th>Description</th><th>Default</th><th>Required</th></tr>
+</thead>
+<tbody>
+<tr><td><code>druid.auth.authenticatorChain</code></td><td>JSON List of Strings</td><td>List of Authenticator type names</td><td>[&quot;allowAll&quot;]</td><td>no</td></tr>
+<tr><td><code>druid.escalator.type</code></td><td>String</td><td>Type of the Escalator that should be used for internal Druid communications. This Escalator must use an authentication scheme that is supported by an Authenticator in <code>druid.auth.authenticatorChain</code>.</td><td>&quot;noop&quot;</td><td>no</td></tr>
+<tr><td><code>druid.auth.authorizers</code></td><td>JSON List of Strings</td><td>List of Authorizer type names</td><td>[&quot;allowAll&quot;]</td><td>no</td></tr>
+<tr><td><code>druid.auth.unsecuredPaths</code></td><td>List of Strings</td><td>List of paths for which security checks will not be performed. All requests to these paths will be allowed.</td><td>[]</td><td>no</td></tr>
+<tr><td><code>druid.auth.allowUnauthenticatedHttpOptions</code></td><td>Boolean</td><td>If true, allow HTTP OPTIONS requests by unauthenticated users. This is primarily useful for supporting CORS preflight requests, which Druid does not support directly, but which can be enabled using third-party extensions.<br /><br />Note that you must add &quot;OPTIONS&quot; to <code>druid.server.http.allowedHttpMethods</code>.<br /><br />Also note that disabling authentication checks for OPTIONS requests will allow unauthenticated users to determine what Druid endpoints are valid (by checking if the OPTIONS request returns a 200 instead of 404). Enabling this option will reveal information about server configuration, including information about what extensions are loaded, to unauthenticated users.</td><td>false</td><td>no</td></tr>
+</tbody>
+</table>
+<h2><a class="anchor" aria-hidden="true" id="enabling-authenticationauthorizationloadinglookuptest"></a><a href="#enabling-authenticationauthorizationloadinglookuptest" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Enabling Authentication/AuthorizationLoadingLookupTest</h2>
+<h2><a class="anchor" aria-hidden="true" id="authenticator-chain"></a><a href="#authenticator-chain" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Authenticator chain</h2>
+<p>Authentication decisions are handled by a chain of Authenticator instances. A request will be checked by Authenticators in the sequence defined by the <code>druid.auth.authenticatorChain</code>.</p>
+<p>Authenticator implementations are provided by extensions.</p>
+<p>For example, the following authenticator chain definition enables the Kerberos and HTTP Basic authenticators, from the <code>druid-kerberos</code> and <code>druid-basic-security</code> core extensions, respectively:</p>
+<pre><code class="hljs"><span class="hljs-attr">druid.auth.authenticatorChain</span>=[<span class="hljs-string">"kerberos"</span>, <span class="hljs-string">"basic"</span>]
+</code></pre>
+<p>A request will pass through all Authenticators in the chain, until one of the Authenticators successfully authenticates the request or sends an HTTP error response. Authenticators later in the chain will be skipped after the first successful authentication or if the request is terminated with an error response.</p>
+<p>If no Authenticator in the chain successfully authenticated a request or sent an HTTP error response, an HTTP error response will be sent at the end of the chain.</p>
+<p>Druid includes two built-in Authenticators, one of which is used for the default unsecured configuration.</p>
+<h3><a class="anchor" aria-hidden="true" id="allowall-authenticator"></a><a href="#allowall-authenticator" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>AllowAll authenticator</h3>
+<p>This built-in Authenticator authenticates all requests, and always directs them to an Authorizer named &quot;allowAll&quot;. It is not intended to be used for anything other than the default unsecured configuration.</p>
+<h3><a class="anchor" aria-hidden="true" id="anonymous-authenticator"></a><a href="#anonymous-authenticator" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Anonymous authenticator</h3>
+<p>This built-in Authenticator authenticates all requests, and directs them to an Authorizer specified in the configuration by the user. It is intended to be used for adding a default level of access so
+the Anonymous Authenticator should be added to the end of the authenticator chain. A request that reaches the Anonymous Authenticator at the end of the chain will succeed or fail depending on how the Authorizer linked to the Anonymous Authenticator is configured.</p>
+<table>
+<thead>
+<tr><th>Property</th><th>Description</th><th>Default</th><th>Required</th></tr>
+</thead>
+<tbody>
+<tr><td><code>druid.auth.authenticator.&lt;authenticatorName&gt;.authorizerName</code></td><td>Authorizer that requests should be directed to.</td><td>N/A</td><td>Yes</td></tr>
+<tr><td><code>druid.auth.authenticator.&lt;authenticatorName&gt;.identity</code></td><td>The identity of the requester.</td><td>defaultUser</td><td>No</td></tr>
+</tbody>
+</table>
+<p>To use the Anonymous Authenticator, add an authenticator with type <code>anonymous</code> to the authenticatorChain.</p>
+<p>For example, the following enables the Anonymous Authenticator with the <code>druid-basic-security</code> extension:</p>
+<pre><code class="hljs"><span class="hljs-attr">druid.auth.authenticatorChain</span>=[<span class="hljs-string">"basic"</span>, <span class="hljs-string">"anonymous"</span>]
+
+<span class="hljs-attr">druid.auth.authenticator.anonymous.type</span>=anonymous
+<span class="hljs-attr">druid.auth.authenticator.anonymous.identity</span>=defaultUser
+<span class="hljs-attr">druid.auth.authenticator.anonymous.authorizerName</span>=myBasicAuthorizer
+
+<span class="hljs-comment"># ... usual configs for basic authentication would go here ...</span>
+</code></pre>
+<h3><a class="anchor" aria-hidden="true" id="trusted-domain-authenticator"></a><a href="#trusted-domain-authenticator" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Trusted domain Authenticator</h3>
+<p>This built-in Trusted Domain Authenticator authenticates requests originating from the configured trusted domain, and directs them to an Authorizer specified in the configuration by the user. It is intended to be used for adding a default level of trust and allow access for hosts within same domain.</p>
+<table>
+<thead>
+<tr><th>Property</th><th>Description</th><th>Default</th><th>Required</th></tr>
+</thead>
+<tbody>
+<tr><td><code>druid.auth.authenticator.&lt;authenticatorName&gt;.name</code></td><td>authenticator name.</td><td>N/A</td><td>Yes</td></tr>
+<tr><td><code>druid.auth.authenticator.&lt;authenticatorName&gt;.domain</code></td><td>Trusted Domain from which requests should be authenticated. If authentication is allowed for connections from only a given host, fully qualified hostname of that host needs to be specified.</td><td>N/A</td><td>Yes</td></tr>
+<tr><td><code>druid.auth.authenticator.&lt;authenticatorName&gt;.useForwardedHeaders</code></td><td>Clients connecting to druid could pass through many layers of proxy. Some proxies also append its own IP address to 'X-Forwarded-For' header before passing on the request to another proxy. Some proxies also connect on behalf of client. If this config is set to true and if 'X-Forwarded-For' is present, trusted domain authenticator will use left most host name from X-Forwarded-For header. Note: It is possible to spoof X-Forwarded-For headers in HTTP requests, enable this with caution.</td><td>false</td><td>No</td></tr>
+<tr><td><code>druid.auth.authenticator.&lt;authenticatorName&gt;.authorizerName</code></td><td>Authorizer that requests should be directed to.</td><td>N/A</td><td>Yes</td></tr>
+<tr><td><code>druid.auth.authenticator.&lt;authenticatorName&gt;.identity</code></td><td>The identity of the requester.</td><td>defaultUser</td><td>No</td></tr>
+</tbody>
+</table>
+<p>To use the Trusted Domain Authenticator, add an authenticator with type <code>trustedDomain</code> to the authenticatorChain.</p>
+<p>For example, the following enables the Trusted Domain Authenticator :</p>
+<pre><code class="hljs"><span class="hljs-attr">druid.auth.authenticatorChain</span>=[<span class="hljs-string">"trustedDomain"</span>]
+
+<span class="hljs-attr">druid.auth.authenticator.trustedDomain.type</span>=trustedDomain
+<span class="hljs-attr">druid.auth.authenticator.trustedDomain.domain</span>=trustedhost.mycompany.com
+<span class="hljs-attr">druid.auth.authenticator.trustedDomain.identity</span>=defaultUser
+<span class="hljs-attr">druid.auth.authenticator.trustedDomain.authorizerName</span>=myBasicAuthorizer
+<span class="hljs-attr">druid.auth.authenticator.trustedDomain.name</span>=myTrustedAutenticator
+<span class="hljs-comment"># ... usual configs for druid would go here ...</span>
+</code></pre>
+<h2><a class="anchor" aria-hidden="true" id="escalator"></a><a href="#escalator" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Escalator</h2>
+<p>The <code>druid.escalator.type</code> property determines what authentication scheme should be used for internal Druid cluster communications (such as when a Broker process communicates with Historical processes for query processing).</p>
+<p>The Escalator chosen for this property must use an authentication scheme that is supported by an Authenticator in <code>druid.auth.authenticatorChain</code>. Authenticator extension implementers must also provide a corresponding Escalator implementation if they intend to use a particular authentication scheme for internal Druid communications.</p>
+<h3><a class="anchor" aria-hidden="true" id="noop-escalator"></a><a href="#noop-escalator" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Noop escalator</h3>
+<p>This built-in default Escalator is intended for use only with the default AllowAll Authenticator and Authorizer.</p>
+<h2><a class="anchor" aria-hidden="true" id="authorizers"></a><a href="#authorizers" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Authorizers</h2>
+<p>Authorization decisions are handled by an Authorizer. The <code>druid.auth.authorizers</code> property determines what Authorizer implementations will be active.</p>
+<p>There are two built-in Authorizers, &quot;default&quot; and &quot;noop&quot;. Other implementations are provided by extensions.</p>
+<p>For example, the following authorizers definition enables the &quot;basic&quot; implementation from <code>druid-basic-security</code>:</p>
+<pre><code class="hljs"><span class="hljs-attr">druid.auth.authorizers</span>=[<span class="hljs-string">"basic"</span>]
+</code></pre>
+<p>Only a single Authorizer will authorize any given request.</p>
+<p>Druid includes one built in authorizer:</p>
+<h3><a class="anchor" aria-hidden="true" id="allowall-authorizer"></a><a href="#allowall-authorizer" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>AllowAll authorizer</h3>
+<p>The Authorizer with type name &quot;allowAll&quot; accepts all requests.</p>
+<h2><a class="anchor" aria-hidden="true" id="default-unsecured-configuration"></a><a href="#default-unsecured-configuration" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Default Unsecured Configuration</h2>
+<p>When <code>druid.auth.authenticatorChain</code> is left empty or unspecified, Druid will create an authenticator chain with a single AllowAll Authenticator named &quot;allowAll&quot;.</p>
+<p>When <code>druid.auth.authorizers</code> is left empty or unspecified, Druid will create a single AllowAll Authorizer named &quot;allowAll&quot;.</p>
+<p>The default value of <code>druid.escalator.type</code> is &quot;noop&quot; to match the default unsecured Authenticator/Authorizer configurations.</p>
+<h2><a class="anchor" aria-hidden="true" id="authenticator-to-authorizer-routing"></a><a href="#authenticator-to-authorizer-routing" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Authenticator to Authorizer Routing</h2>
+<p>When an Authenticator successfully authenticates a request, it must attach a AuthenticationResult to the request, containing an information about the identity of the requester, as well as the name of the Authorizer that should authorize the authenticated request.</p>
+<p>An Authenticator implementation should provide some means through configuration to allow users to select what Authorizer(s) the Authenticator should route requests to.</p>
+<h2><a class="anchor" aria-hidden="true" id="internal-system-user"></a><a href="#internal-system-user" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Internal system user</h2>
+<p>Internal requests between Druid processes (non-user initiated communications) need to have authentication credentials attached.</p>
+<p>These requests should be run as an &quot;internal system user&quot;, an identity that represents the Druid cluster itself, with full access permissions.</p>
+<p>The details of how the internal system user is defined is left to extension implementations.</p>
+<h3><a class="anchor" aria-hidden="true" id="authorizer-internal-system-user-handling"></a><a href="#authorizer-internal-system-user-handling" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Authorizer Internal System User Handling</h3>
+<p>Authorizers implementations must recognize and authorize an identity for the &quot;internal system user&quot;, with full access permissions.</p>
+<h3><a class="anchor" aria-hidden="true" id="authenticator-and-escalator-internal-system-user-handling"></a><a href="#authenticator-and-escalator-internal-system-user-handling" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Authenticator and Escalator Internal System User Handling</h3>
+<p>An Authenticator implementation that is intended to support internal Druid communications must recognize credentials for the &quot;internal system user&quot;, as provided by a corresponding Escalator implementation.</p>
+<p>An Escalator must implement three methods related to the internal system user:</p>
+<pre><code class="hljs css language-java">  <span class="hljs-function"><span class="hljs-keyword">public</span> HttpClient <span class="hljs-title">createEscalatedClient</span><span class="hljs-params">(HttpClient baseClient)</span></span>;
+
+  <span class="hljs-keyword">public</span> org.eclipse.jetty.client.<span class="hljs-function">HttpClient <span class="hljs-title">createEscalatedJettyClient</span><span class="hljs-params">(org.eclipse.jetty.client.HttpClient baseClient)</span></span>;
+
+  <span class="hljs-function"><span class="hljs-keyword">public</span> AuthenticationResult <span class="hljs-title">createEscalatedAuthenticationResult</span><span class="hljs-params">()</span></span>;
+</code></pre>
+<p><code>createEscalatedClient</code> returns an wrapped HttpClient that attaches the credentials of the &quot;internal system user&quot; to requests.</p>
+<p><code>createEscalatedJettyClient</code> is similar to <code>createEscalatedClient</code>, except that it operates on a Jetty HttpClient.</p>
+<p><code>createEscalatedAuthenticationResult</code> returns an AuthenticationResult containing the identity of the &quot;internal system user&quot;.</p>
+<h2><a class="anchor" aria-hidden="true" id="reserved-name-configuration-property"></a><a href="#reserved-name-configuration-property" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Reserved Name Configuration Property</h2>
+<p>For extension implementers, please note that the following configuration properties are reserved for the names of Authenticators and Authorizers:</p>
+<pre><code class="hljs">druid.auth.authenticator.&lt;authenticator-<span class="hljs-built_in">name</span>&gt;.<span class="hljs-built_in">name</span>=&lt;authenticator-<span class="hljs-built_in">name</span>&gt;
+druid.auth.authorizer.&lt;authorizer-<span class="hljs-built_in">name</span>&gt;.<span class="hljs-built_in">name</span>=&lt;authorizer-<span class="hljs-built_in">name</span>&gt;
+
+</code></pre>
+<p>These properties provide the authenticator and authorizer names to the implementations as @JsonProperty parameters, potentially useful when multiple authenticators or authorizers of the same type are configured.</p>
+</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/0.20.0/comparisons/druid-vs-sql-on-hadoop.html"><span class="arrow-prev">← </span><span>Apache Druid vs SQL-on-Hadoop</span></a><a class="docs-next button" href="/docs/0.20.0/design/broker.html"><span>Broker</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#enabling-authenticationauthorizationloadinglookuptest">Enabling Authentication/AuthorizationLoadingLookupTest</a></li><li><a href="#authenticator-chain">Authenticator chain</a><ul class="toc-headings"><li><a href="#allowall-authenticator">AllowAll authenticator</a></li><li><a href="#anonymous-authenticator">Anonymous authenticator</a></li><li><a href="#trusted-domain-authenticator">Trusted domain Authenticator</a></li></ul></li><li><a href="#escalator">Escalator</a><ul class="toc-headings"><li><a href="#noop-escalator">Noop escalator</a></li></ul></li><li><a href="#authorizers">Authorizers</a><ul class="toc-headings"><li><a href="#allowall-authorizer">AllowAll authorizer</a></li></ul></li><li><a href="#default-unsecured-configuration">Default Unsecured Configuration</a></li><li><a href="#authenticator-to-authorizer-routing">Authenticator to Authorizer Routing</a></li><li><a href="#internal-system-user">Internal system user</a><ul class="toc-headings"><li><a href="#authorizer-internal-system-user-handling">Authorizer Internal System User Handling</a></li><li><a href="#authenticator-and-escalator-internal-system-user-handling">Authenticator and Escalator Internal System User Handling</a></li></ul></li><li><a href="#reserved-name-configuration-property">Reserved Name Configuration Property</a></li></ul></nav></div><footer class="nav-footer druid-footer" id="footer"><div class="container"><div class="text-center"><p><a href="/technology">Technology</a> · <a href="/use-cases">Use Cases</a> · <a href="/druid-powered">Powered by Druid</a> · <a href="/docs/0.20.0/latest">Docs</a> · <a href="/community/">Community</a> · <a href="/downloads.html">Download</a> · <a href="/faq">FAQ</a></p></div><div class="text-center"><a title="Join the user group" href="https://groups.google.com/forum/#!forum/druid-user" target="_blank"><span class="fa fa-comments"></span></a> · <a title="Follow Druid" href="https://twitter.com/druidio" target="_blank"><span class="fab fa-twitter"></span></a> · <a title="Download via Apache" href="https://www.apache.org/dyn/closer.cgi?path=/incubator/druid/{{ site.druid_versions[0].versions[0].version }}/apache-druid-{{ site.druid_versions[0].versions[0].version }}-bin.tar.gz" target="_blank"><span class="fas fa-feather"></span></a> · <a title="GitHub" href="https://github.com/apache/druid" target="_blank"><span class="fab fa-github"></span></a></div><div class="text-center license">Copyright © 2019 <a href="https://www.apache.org/" target="_blank">Apache Software Foundation</a>.<br/>Except where otherwise noted, licensed under <a rel="license" href="http://creativecommons.org/licenses/by-sa/4.0/">CC BY-SA 4.0</a>.<br/>Apache Druid, Druid, and the Druid logo are either registered trademarks or trademarks of The Apache Software Foundation in the United States and other countries.</div></div></footer></div><script type="text/javascript" src="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.js"></script><script>
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UIs</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/operations/deep-storage-migration.html">Deep storage migration</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/operations/export-metadata.html">Export Metadata Tool</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/operations/metadata-migration.html">Metadata Migration</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/operations/segment-optimization.html">Segment Size Optimization</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/operations/use_sbt_to_build_fat_jar.html">Content for build.sbt</a></li></ul></div></ul></div><div class="navGroup"><h3 class="navGroupCategoryTitle collapsible">Development<span class="arrow"><svg width="24" height="24" viewBox="0 0 24 24"><path fill="#565656" d="M7.41 15.41L12 10.83l4.59 4.58L18 14l-6-6-6 6z"></path><path d="M0 0h24v24H0z" fill="none"></path></svg></span></h3><ul class="hide"><li 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+<h3><a class="anchor" aria-hidden="true" id="configuration"></a><a href="#configuration" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Configuration</h3>
+<p>For Apache Druid Broker Process Configuration, see <a href="../configuration/index.html#broker">Broker Configuration</a>.</p>
+<h3><a class="anchor" aria-hidden="true" id="http-endpoints"></a><a href="#http-endpoints" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>HTTP endpoints</h3>
+<p>For a list of API endpoints supported by the Broker, see <a href="../operations/api-reference.html#broker">Broker API</a>.</p>
+<h3><a class="anchor" aria-hidden="true" id="overview"></a><a href="#overview" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Overview</h3>
+<p>The Broker is the process to route queries to if you want to run a distributed cluster. It understands the metadata published to ZooKeeper about what segments exist on what processes and routes queries such that they hit the right processes. This process also merges the result sets from all of the individual processes together.
+On start up, Historical processes announce themselves and the segments they are serving in Zookeeper.</p>
+<h3><a class="anchor" aria-hidden="true" id="running"></a><a href="#running" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Running</h3>
+<pre><code class="hljs">org.apache.druid.cli.Main<span class="hljs-built_in"> server </span>broker
+</code></pre>
+<h3><a class="anchor" aria-hidden="true" id="forwarding-queries"></a><a href="#forwarding-queries" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Forwarding queries</h3>
+<p>Most Druid queries contain an interval object that indicates a span of time for which data is requested. Likewise, Druid <a href="/docs/0.20.0/design/segments.html">Segments</a> are partitioned to contain data for some interval of time and segments are distributed across a cluster. Consider a simple datasource with 7 segments where each segment contains data for a given day of the week. Any query issued to the datasource for more than one day of data will hit more than one segment. These segments will likely be distributed across multiple processes, and hence, the query will likely hit multiple processes.</p>
+<p>To determine which processes to forward queries to, the Broker process first builds a view of the world from information in Zookeeper. Zookeeper maintains information about <a href="/docs/0.20.0/design/historical.html">Historical</a> and streaming ingestion <a href="/docs/0.20.0/design/peons.html">Peon</a> processes and the segments they are serving. For every datasource in Zookeeper, the Broker process builds a timeline of segments and the processes that serve them. When queries are received for a specific datasource and interval, the Broker process performs a lookup into the timeline associated with the query datasource for the query interval and retrieves the processes that contain data for the query. The Broker process then forwards down the query to the selected processes.</p>
+<h3><a class="anchor" aria-hidden="true" id="caching"></a><a href="#caching" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Caching</h3>
+<p>Broker processes employ a cache with an LRU cache invalidation strategy. The Broker cache stores per-segment results. The cache can be local to each Broker process or shared across multiple processes using an external distributed cache such as <a href="http://memcached.org/">memcached</a>. Each time a broker process receives a query, it first maps the query to a set of segments. A subset of these segment results may already exist in the cache and the results can be directly pulled from the cache. For any segment results that do not exist in the cache, the broker process will forward the query to the
+Historical processes. Once the Historical processes return their results, the Broker will store those results in the cache. Real-time segments are never cached and hence requests for real-time data will always be forwarded to real-time processes. Real-time data is perpetually changing and caching the results would be unreliable.</p>
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UIs</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/operations/deep-storage-migration.html">Deep storage migration</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/operations/export-metadata.html">Export Metadata Tool</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/operations/metadata-migration.html">Metadata Migration</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/operations/segment-optimization.html">Segment Size Optimization</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/operations/use_sbt_to_build_fat_jar.html">Content for build.sbt</a></li></ul></div></ul></div><div class="navGroup"><h3 class="navGroupCategoryTitle collapsible">Development<span class="arrow"><svg width="24" height="24" viewBox="0 0 24 24"><path fill="#565656" d="M7.41 15.41L12 10.83l4.59 4.58L18 14l-6-6-6 6z"></path><path d="M0 0h24v24H0z" fill="none"></path></svg></span></h3><ul class="hide"><li 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+<h3><a class="anchor" aria-hidden="true" id="configuration"></a><a href="#configuration" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Configuration</h3>
+<p>For Apache Druid Coordinator Process Configuration, see <a href="../configuration/index.html#coordinator">Coordinator Configuration</a>.</p>
+<h3><a class="anchor" aria-hidden="true" id="http-endpoints"></a><a href="#http-endpoints" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>HTTP endpoints</h3>
+<p>For a list of API endpoints supported by the Coordinator, see <a href="../operations/api-reference.html#coordinator">Coordinator API</a>.</p>
+<h3><a class="anchor" aria-hidden="true" id="overview"></a><a href="#overview" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Overview</h3>
+<p>The Druid Coordinator process is primarily responsible for segment management and distribution. More specifically, the
+Druid Coordinator process communicates to Historical processes to load or drop segments based on configurations. The
+Druid Coordinator is responsible for loading new segments, dropping outdated segments, ensuring that segments are
+&quot;replicated&quot; (that is, loaded on multiple different Historical nodes) proper (configured) number of times, and moving
+(&quot;balancing&quot;) segments between Historical nodes to keep the latter evenly loaded.</p>
+<p>The Druid Coordinator runs its duties periodically and the time between each run is a configurable parameter. On each
+run, the Coordinator assesses the current state of the cluster before deciding on the appropriate actions to take.
+Similar to the Broker and Historical processes, the Druid Coordinator maintains a connection to a Zookeeper cluster for
+current cluster information. The Coordinator also maintains a connection to a database containing information about
+&quot;used&quot; segments (that is, the segments that <em>should</em> be loaded in the cluster) and the loading rules.</p>
+<p>Before any unassigned segments are serviced by Historical processes, the Historical processes for each tier are first
+sorted in terms of capacity, with least capacity servers having the highest priority. Unassigned segments are always
+assigned to the processes with least capacity to maintain a level of balance between processes. The Coordinator does not
+directly communicate with a historical process when assigning it a new segment; instead the Coordinator creates some
+temporary information about the new segment under load queue path of the historical process. Once this request is seen,
+the historical process will load the segment and begin servicing it.</p>
+<h3><a class="anchor" aria-hidden="true" id="running"></a><a href="#running" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Running</h3>
+<pre><code class="hljs">org.apache.druid.cli.Main<span class="hljs-built_in"> server </span>coordinator
+</code></pre>
+<h3><a class="anchor" aria-hidden="true" id="rules"></a><a href="#rules" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Rules</h3>
+<p>Segments can be automatically loaded and dropped from the cluster based on a set of rules. For more information on rules, see <a href="/docs/0.20.0/operations/rule-configuration.html">Rule Configuration</a>.</p>
+<h3><a class="anchor" aria-hidden="true" id="cleaning-up-segments"></a><a href="#cleaning-up-segments" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Cleaning up segments</h3>
+<p>On each run, the Druid Coordinator compares the set of used segments in the database with the segments served by some
+Historical nodes in the cluster. Coordinator sends requests to Historical nodes to unload unused segments or segments
+that are removed from the database.</p>
+<p>Segments that are overshadowed (their versions are too old and their data has been replaced by newer segments) are
+marked as unused. During the next Coordinator's run, they will be unloaded from Historical nodes in the cluster.</p>
+<h3><a class="anchor" aria-hidden="true" id="segment-availability"></a><a href="#segment-availability" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Segment availability</h3>
+<p>If a Historical process restarts or becomes unavailable for any reason, the Druid Coordinator will notice a process has gone missing and treat all segments served by that process as being dropped. Given a sufficient period of time, the segments may be reassigned to other Historical processes in the cluster. However, each segment that is dropped is not immediately forgotten. Instead, there is a transitional data structure that stores all dropped segments with an associated lifetime. The lifetime represents a period of time in which the Coordinator will not reassign a dropped segment. Hence, if a historical process becomes unavailable and available again within a short period of time, the historical process will start up and serve segments from its cache without any those segments being reassigned across the cluster.</p>
+<h3><a class="anchor" aria-hidden="true" id="balancing-segment-load"></a><a href="#balancing-segment-load" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Balancing segment load</h3>
+<p>To ensure an even distribution of segments across Historical processes in the cluster, the Coordinator process will find the total size of all segments being served by every Historical process each time the Coordinator runs. For every Historical process tier in the cluster, the Coordinator process will determine the Historical process with the highest utilization and the Historical process with the lowest utilization. The percent difference in utilization between the two processes is computed, and if the result exceeds a certain threshold, a number of segments will be moved from the highest utilized process to the lowest utilized process. There is a configurable limit on the number of segments that can be moved from one process to another each time the Coordinator runs. Segments to be moved are selected at random and only moved if the resulting utilization calculation indicates the percentage difference between the highest and lowest servers has decreased.</p>
+<h3><a class="anchor" aria-hidden="true" id="compacting-segments"></a><a href="#compacting-segments" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Compacting Segments</h3>
+<p>Each run, the Druid Coordinator compacts segments by merging small segments or splitting a large one. This is useful when your segments are not optimized
+in terms of segment size which may degrade query performance. See <a href="/docs/0.20.0/operations/segment-optimization.html">Segment Size Optimization</a> for details.</p>
+<p>The Coordinator first finds the segments to compact based on the <a href="#segment-search-policy">segment search policy</a>.
+Once some segments are found, it issues a <a href="/docs/0.20.0/ingestion/tasks.html#compact">compaction task</a> to compact those segments.
+The maximum number of running compaction tasks is <code>min(sum of worker capacity * slotRatio, maxSlots)</code>.
+Note that even though <code>min(sum of worker capacity * slotRatio, maxSlots)</code> = 0, at least one compaction task is always submitted
+if the compaction is enabled for a dataSource.
+See <a href="../operations/api-reference.html#compaction-configuration">Compaction Configuration API</a> and <a href="../configuration/index.html#compaction-dynamic-configuration">Compaction Configuration</a> to enable the compaction.</p>
+<p>Compaction tasks might fail due to the following reasons.</p>
+<ul>
+<li>If the input segments of a compaction task are removed or overshadowed before it starts, that compaction task fails immediately.</li>
+<li>If a task of a higher priority acquires a <a href="../ingestion/tasks.html#locking">time chunk lock</a> for an interval overlapping with the interval of a compaction task, the compaction task fails.</li>
+</ul>
+<p>Once a compaction task fails, the Coordinator simply checks the segments in the interval of the failed task again, and issues another compaction task in the next run.</p>
+<h3><a class="anchor" aria-hidden="true" id="segment-search-policy"></a><a href="#segment-search-policy" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Segment search policy</h3>
+<h4><a class="anchor" aria-hidden="true" id="recent-segment-first-policy"></a><a href="#recent-segment-first-policy" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Recent segment first policy</h4>
+<p>At every coordinator run, this policy looks up time chunks in order of newest-to-oldest and checks whether the segments in those time chunks
+need compaction or not.
+A set of segments need compaction if all conditions below are satisfied.</p>
+<ol>
+<li>Total size of segments in the time chunk is smaller than or equal to the configured <code>inputSegmentSizeBytes</code>.</li>
+<li>Segments have never been compacted yet or compaction spec has been updated since the last compaction, especially <code>maxRowsPerSegment</code>, <code>maxTotalRows</code>, and <code>indexSpec</code>.</li>
+</ol>
+<p>Here are some details with an example. Suppose we have two dataSources (<code>foo</code>, <code>bar</code>) as seen below:</p>
+<ul>
+<li><code>foo</code>
+<ul>
+<li><code>foo_2017-11-01T00:00:00.000Z_2017-12-01T00:00:00.000Z_VERSION</code></li>
+<li><code>foo_2017-11-01T00:00:00.000Z_2017-12-01T00:00:00.000Z_VERSION_1</code></li>
+<li><code>foo_2017-09-01T00:00:00.000Z_2017-10-01T00:00:00.000Z_VERSION</code></li>
+</ul></li>
+<li><code>bar</code>
+<ul>
+<li><code>bar_2017-10-01T00:00:00.000Z_2017-11-01T00:00:00.000Z_VERSION</code></li>
+<li><code>bar_2017-10-01T00:00:00.000Z_2017-11-01T00:00:00.000Z_VERSION_1</code></li>
+</ul></li>
+</ul>
+<p>Assuming that each segment is 10 MB and haven't been compacted yet, this policy first returns two segments of
+<code>foo_2017-11-01T00:00:00.000Z_2017-12-01T00:00:00.000Z_VERSION</code> and <code>foo_2017-11-01T00:00:00.000Z_2017-12-01T00:00:00.000Z_VERSION_1</code> to compact together because
+<code>2017-11-01T00:00:00.000Z/2017-12-01T00:00:00.000Z</code> is the most recent time chunk.</p>
+<p>If the coordinator has enough task slots for compaction, this policy will continue searching for the next segments and return
+<code>bar_2017-10-01T00:00:00.000Z_2017-11-01T00:00:00.000Z_VERSION</code> and <code>bar_2017-10-01T00:00:00.000Z_2017-11-01T00:00:00.000Z_VERSION_1</code>.
+Finally, <code>foo_2017-09-01T00:00:00.000Z_2017-10-01T00:00:00.000Z_VERSION</code> will be picked up even though there is only one segment in the time chunk of <code>2017-09-01T00:00:00.000Z/2017-10-01T00:00:00.000Z</code>.</p>
+<p>The search start point can be changed by setting <a href="../configuration/index.html#compaction-dynamic-configuration">skipOffsetFromLatest</a>.
+If this is set, this policy will ignore the segments falling into the time chunk of (the end time of the most recent segment - <code>skipOffsetFromLatest</code>).
+This is to avoid conflicts between compaction tasks and realtime tasks.
+Note that realtime tasks have a higher priority than compaction tasks by default. Realtime tasks will revoke the locks of compaction tasks if their intervals overlap, resulting in the termination of the compaction task.</p>
+<blockquote>
+<p>This policy currently cannot handle the situation when there are a lot of small segments which have the same interval,
+and their total size exceeds <a href="/docs/0.20.0/configuration/index.html#compaction-dynamic-configuration">inputSegmentSizeBytes</a>.
+If it finds such segments, it simply skips them.</p>
+</blockquote>
+<h3><a class="anchor" aria-hidden="true" id="the-coordinator-console"></a><a href="#the-coordinator-console" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>The Coordinator console</h3>
+<p>The Druid Coordinator exposes a web GUI for displaying cluster information and rule configuration. For more details, please see <a href="../operations/management-uis.html#coordinator-consoles">coordinator console</a>.</p>
+<h3><a class="anchor" aria-hidden="true" id="faq"></a><a href="#faq" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>FAQ</h3>
+<ol>
+<li><p><strong>Do clients ever contact the Coordinator process?</strong></p>
+<p>The Coordinator is not involved in a query.</p>
+<p>Historical processes never directly contact the Coordinator process. The Druid Coordinator tells the Historical processes to load/drop data via Zookeeper, but the Historical processes are completely unaware of the Coordinator.</p>
+<p>Brokers also never contact the Coordinator. Brokers base their understanding of the data topology on metadata exposed by the Historical processes via ZK and are completely unaware of the Coordinator.</p></li>
+<li><p><strong>Does it matter if the Coordinator process starts up before or after other processes?</strong></p>
+<p>No. If the Druid Coordinator is not started up, no new segments will be loaded in the cluster and outdated segments will not be dropped. However, the Coordinator process can be started up at any time, and after a configurable delay, will start running Coordinator tasks.</p>
+<p>This also means that if you have a working cluster and all of your Coordinators die, the cluster will continue to function, it just won’t experience any changes to its data topology.</p></li>
+</ol>
+</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/0.20.0/design/broker.html"><span class="arrow-prev">← </span><span>Broker</span></a><a class="docs-next button" href="/docs/0.20.0/design/historical.html"><span>Historical Process</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"></nav></div><footer class="nav-footer druid-footer" id="footer"><div class="container"><div class="text-center"><p><a href="/technology">Technology</a> · <a href="/use-cases">Use Cases</a> · <a href="/druid-powered">Powered by Druid</a> · <a href="/docs/0.20.0/latest">Docs</a> · <a href="/community/">Community</a> · <a href="/downloads.html">Download</a> · <a href="/faq">FAQ</a></p></div><div class="text-center"><a title="Join the user group" href="https://groups.google.com/forum/#!forum/druid-user" target="_blank"><span class="fa fa-comments"></span></a> · <a title="Follow Druid" href="https://twitter.com/druidio" target="_blank"><span class="fab fa-twitter"></span></a> · <a title="Download via Apache" href="https://www.apache.org/dyn/closer.cgi?path=/incubator/druid/{{ site.druid_versions[0].versions[0].version }}/apache-druid-{{ site.druid_versions[0].versions[0].version }}-bin.tar.gz" target="_blank"><span class="fas fa-feather"></span></a> · <a title="GitHub" href="https://github.com/apache/druid" target="_blank"><span class="fab fa-github"></span></a></div><div class="text-center license">Copyright © 2019 <a href="https://www.apache.org/" target="_blank">Apache Software Foundation</a>.<br/>Except where otherwise noted, licensed under <a rel="license" href="http://creativecommons.org/licenses/by-sa/4.0/">CC BY-SA 4.0</a>.<br/>Apache Druid, Druid, and the Druid logo are either registered trademarks or trademarks of The Apache Software Foundation in the United States and other countries.</div></div></footer></div><script type="text/javascript" src="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.js"></script><script>
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@@ -0,0 +1,634 @@
+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Dropwizard metrics emitter · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/0.20.0/design/extensions-contrib/dropwizard.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.20.0" /><meta property="og:title" content="Dropwizard metrics emitter · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
+              window.dataLayer = window.dataLayer || [];
+              function gtag(){dataLayer.push(arguments); }
+              gtag('js', new Date());
+              gtag('config', 'UA-131010415-1');
+            </script><link rel="stylesheet" href="https://use.fontawesome.com/releases/v5.7.2/css/all.css"/><link rel="stylesheet" href="/css/code-block-buttons.css"/><script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/clipboard.js/2.0.4/clipboard.min.js"></script><script type="text/javascript" src="/js/code-block-buttons.js"></script><script src="/js/scrollSpy.js"></script><link rel="stylesheet" href="/css/main.css"/><script src="/js/codetabs.js"></script></head><body class="sideNavVisible separateOnPageNav"><div class="fixedHeaderContainer"><div class="headerWrapper wrapper"><header><a href="/"><img class="logo" src="/img/druid_nav.png" alt="Apache Druid"/></a><div class="navigationWrapper navigationSlider"><nav class="slidingNav"><ul class="nav-site nav-site-internal"><li class=""><a href="/technology" target="_self">Technology</a></li><li class=""><a href="/use-cases" target="_self">Use Cases</a></li><li class=""><a href="/druid-powered" target="_self">Powered By</a></li><li class=""><a href="/docs/0.20.0/design/index.html" target="_self">Docs</a></li><li class=""><a href="/community/" target="_self">Community</a></li><li class=""><a href="https://www.apache.org" target="_self">Apache</a></li><li class=""><a href="/downloads.html" target="_self">Download</a></li><li class="navSearchWrapper reactNavSearchWrapper"><input type="text" id="search_input_react" placeholder="Search" title="Search"/></li></ul></nav></div></header></div></div><div class="navPusher"><div class="docMainWrapper wrapper"><div class="container mainContainer docsContainer"><div class="wrapper"><div class="post"><header class="postHeader"><a class="edit-page-link button" href="https://github.com/apache/druid/edit/master/docs/design/extensions-contrib/dropwizard.md" target="_blank" rel="noreferrer noopener">Edit</a><h1 id="__docusaurus" class="postHeaderTitle">Dropwizard metrics emitter</h1></header><article><div><span><!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+  -->
+<h1><a class="anchor" aria-hidden="true" id="dropwizard-emitter"></a><a href="#dropwizard-emitter" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Dropwizard Emitter</h1>
+<p>To use this extension, make sure to <a href="/docs/0.20.0/development/extensions.html#loading-extensions">include</a> <code>dropwizard-emitter</code> extension.</p>
+<h2><a class="anchor" aria-hidden="true" id="introduction"></a><a href="#introduction" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Introduction</h2>
+<p>This extension integrates <a href="http://metrics.dropwizard.io/3.1.0/getting-started/#">Dropwizard</a> metrics library with druid so that dropwizard users can easily absorb druid into their monitoring ecosystem.
+It accumulates druid metrics as dropwizard metrics, and emits them to various sinks via dropwizard supported reporters.
+Currently supported dropwizard metrics types counter, gauge, meter, timer and histogram.
+These metrics can be emitted using either Console or JMX reporter.</p>
+<p>To use this emitter, set</p>
+<pre><code class="hljs"><span class="hljs-attr">druid.emitter</span>=dropwizard
+</code></pre>
+<h2><a class="anchor" aria-hidden="true" id="configuration"></a><a href="#configuration" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Configuration</h2>
+<p>All the configuration parameters for Dropwizard emitter are under <code>druid.emitter.dropwizard</code>.</p>
+<table>
+<thead>
+<tr><th>property</th><th>description</th><th>required?</th><th>default</th></tr>
+</thead>
+<tbody>
+<tr><td><code>druid.emitter.dropwizard.reporters</code></td><td>List of dropwizard reporters to be used. Here is a list of <a href="#supported-dropwizard-reporters">Supported Reporters</a></td><td>yes</td><td>none</td></tr>
+<tr><td><code>druid.emitter.dropwizard.prefix</code></td><td>Optional prefix to be used for metrics name</td><td>no</td><td>none</td></tr>
+<tr><td><code>druid.emitter.dropwizard.includeHost</code></td><td>Flag to include the host and port as part of the metric name.</td><td>no</td><td>yes</td></tr>
+<tr><td><code>druid.emitter.dropwizard.dimensionMapPath</code></td><td>Path to JSON file defining the dropwizard metric type, and desired dimensions for every Druid metric</td><td>no</td><td>Default mapping provided. See below.</td></tr>
+<tr><td><code>druid.emitter.dropwizard.alertEmitters</code></td><td>List of emitters where alerts will be forwarded to.</td><td>no</td><td>empty list (no forwarding)</td></tr>
+<tr><td><code>druid.emitter.dropwizard.maxMetricsRegistrySize</code></td><td>Maximum size of metrics registry to be cached at any time.</td><td>no</td><td>100 Mb</td></tr>
+</tbody>
+</table>
+<h3><a class="anchor" aria-hidden="true" id="druid-to-dropwizard-event-conversion"></a><a href="#druid-to-dropwizard-event-conversion" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Druid to Dropwizard Event Conversion</h3>
+<p>Each metric emitted using Dropwizard must specify a type, one of <code>[timer, counter, guage, meter, histogram]</code>. Dropwizard Emitter expects this mapping to
+be provided as a JSON file.  Additionally, this mapping specifies which dimensions should be included for each metric.
+If the user does not specify their own JSON file, a <a href="#default-metrics-mapping">default mapping</a> is used.
+All metrics are expected to be mapped. Metrics which are not mapped will be ignored.
+Dropwizard metric path is organized using the following schema:</p>
+<p><code>&lt;druid metric name&gt; : { &quot;dimensions&quot; : &lt;dimension list&gt;, &quot;type&quot; : &lt;Dropwizard metric type&gt;, &quot;timeUnit&quot; : &lt;For timers, timeunit in which metric is emitted&gt;}</code></p>
+<p>e.g.</p>
+<pre><code class="hljs css language-json">"query/time" : { "dimensions" : ["dataSource", "type"], "type" : "timer", "timeUnit": "MILLISECONDS"},
+"segment/scan/pending" : { "dimensions" : [], "type" : "gauge"}
+</code></pre>
+<p>For most use-cases, the default mapping is sufficient.</p>
+<h3><a class="anchor" aria-hidden="true" id="supported-dropwizard-reporters"></a><a href="#supported-dropwizard-reporters" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Supported Dropwizard reporters</h3>
+<h4><a class="anchor" aria-hidden="true" id="jmx-reporter"></a><a href="#jmx-reporter" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>JMX Reporter</h4>
+<p>Used to report druid metrics via JMX.</p>
+<pre><code class="hljs">
+<span class="hljs-attr">druid.emitter.dropwizard.reporters</span>=[{<span class="hljs-string">"type"</span>:<span class="hljs-string">"jmx"</span>}]
+
+</code></pre>
+<h4><a class="anchor" aria-hidden="true" id="console-reporter"></a><a href="#console-reporter" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Console Reporter</h4>
+<p>Used to print Druid Metrics to console logs.</p>
+<pre><code class="hljs">
+druid.emitter.dropwizard.reporters=[{<span class="hljs-string">"type"</span>:<span class="hljs-string">"console"</span>,<span class="hljs-string">"emitIntervalInSecs"</span>:<span class="hljs-number">30</span>}<span class="hljs-string">"}]</span>
+
+</code></pre>
+<h3><a class="anchor" aria-hidden="true" id="default-metrics-mapping"></a><a href="#default-metrics-mapping" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Default Metrics Mapping</h3>
+<p>Latest default metrics mapping can be found [here] (<a href="https://github.com/apache/druid/tree/master/extensions-contrib/dropwizard/src/main/resources/defaultMetricDimensions.json">https://github.com/apache/druid/tree/master/extensions-contrib/dropwizard/src/main/resources/defaultMetricDimensions.json</a>)</p>
+<pre><code class="hljs css language-json">{
+  <span class="hljs-attr">"query/time"</span>: {
+    <span class="hljs-attr">"dimensions"</span>: [
+      <span class="hljs-string">"dataSource"</span>,
+      <span class="hljs-string">"type"</span>
+    ],
+    <span class="hljs-attr">"type"</span>: <span class="hljs-string">"timer"</span>,
+    <span class="hljs-attr">"timeUnit"</span>: <span class="hljs-string">"MILLISECONDS"</span>
+  },
+  <span class="hljs-attr">"query/node/time"</span>: {
+    <span class="hljs-attr">"dimensions"</span>: [
+      <span class="hljs-string">"server"</span>
+    ],
+    <span class="hljs-attr">"type"</span>: <span class="hljs-string">"timer"</span>,
+    <span class="hljs-attr">"timeUnit"</span>: <span class="hljs-string">"MILLISECONDS"</span>
+  },
+  <span class="hljs-attr">"query/node/ttfb"</span>: {
+    <span class="hljs-attr">"dimensions"</span>: [
+      <span class="hljs-string">"server"</span>
+    ],
+    <span class="hljs-attr">"type"</span>: <span class="hljs-string">"timer"</span>,
+    <span class="hljs-attr">"timeUnit"</span>: <span class="hljs-string">"MILLISECONDS"</span>
+  },
+  <span class="hljs-attr">"query/node/backpressure"</span>: {
+    <span class="hljs-attr">"dimensions"</span>: [
+      <span class="hljs-string">"server"</span>
+    ],
+    <span class="hljs-attr">"type"</span>: <span class="hljs-string">"timer"</span>,
+    <span class="hljs-attr">"timeUnit"</span>: <span class="hljs-string">"MILLISECONDS"</span>
+  },
+  <span class="hljs-attr">"query/segment/time"</span>: {
+    <span class="hljs-attr">"dimensions"</span>: [],
+    <span class="hljs-attr">"type"</span>: <span class="hljs-string">"timer"</span>,
+    <span class="hljs-attr">"timeUnit"</span>: <span class="hljs-string">"MILLISECONDS"</span>
+  },
+  <span class="hljs-attr">"query/wait/time"</span>: {
+    <span class="hljs-attr">"dimensions"</span>: [],
+    <span class="hljs-attr">"type"</span>: <span class="hljs-string">"timer"</span>,
+    <span class="hljs-attr">"timeUnit"</span>: <span class="hljs-string">"MILLISECONDS"</span>
+  },
+  <span class="hljs-attr">"segment/scan/pending"</span>: {
+    <span class="hljs-attr">"dimensions"</span>: [],
+    <span class="hljs-attr">"type"</span>: <span class="hljs-string">"gauge"</span>
+  },
+  <span class="hljs-attr">"query/segmentAndCache/time"</span>: {
+    <span class="hljs-attr">"dimensions"</span>: [],
+    <span class="hljs-attr">"type"</span>: <span class="hljs-string">"timer"</span>,
+    <span class="hljs-attr">"timeUnit"</span>: <span class="hljs-string">"MILLISECONDS"</span>
+  },
+  <span class="hljs-attr">"query/cpu/time"</span>: {
+    <span class="hljs-attr">"dimensions"</span>: [
+      <span class="hljs-string">"dataSource"</span>,
+      <span class="hljs-string">"type"</span>
+    ],
+    <span class="hljs-attr">"type"</span>: <span class="hljs-string">"timer"</span>,
+    <span class="hljs-attr">"timeUnit"</span>: <span class="hljs-string">"NANOSECONDS"</span>
+  },
+  <span class="hljs-attr">"query/cache/delta/numEntries"</span>: {
+    <span class="hljs-attr">"dimensions"</span>: [],
+    <span class="hljs-attr">"type"</span>: <span class="hljs-string">"counter"</span>
+  },
+  <span class="hljs-attr">"query/cache/delta/sizeBytes"</span>: {
+    <span class="hljs-attr">"dimensions"</span>: [],
+    <span class="hljs-attr">"type"</span>: <span class="hljs-string">"counter"</span>
+  },
+  <span class="hljs-attr">"query/cache/delta/hits"</span>: {
+    <span class="hljs-attr">"dimensions"</span>: [],
+    <span class="hljs-attr">"type"</span>: <span class="hljs-string">"counter"</span>
+  },
+  <span class="hljs-attr">"query/cache/delta/misses"</span>: {
+    <span class="hljs-attr">"dimensions"</span>: [],
+    <span class="hljs-attr">"type"</span>: <span class="hljs-string">"counter"</span>
+  },
+  <span class="hljs-attr">"query/cache/delta/evictions"</span>: {
+    <span class="hljs-attr">"dimensions"</span>: [],
+    <span class="hljs-attr">"type"</span>: <span class="hljs-string">"counter"</span>
+  },
+  <span class="hljs-attr">"query/cache/delta/hitRate"</span>: {
+    <span class="hljs-attr">"dimensions"</span>: [],
+    <span class="hljs-attr">"type"</span>: <span class="hljs-string">"counter"</span>
+  },
+  <span class="hljs-attr">"query/cache/delta/averageBytes"</span>: {
+    <span class="hljs-attr">"dimensions"</span>: [],
+    <span class="hljs-attr">"type"</span>: <span class="hljs-string">"counter"</span>
+  },
+  <span class="hljs-attr">"query/cache/delta/timeouts"</span>: {
+    <span class="hljs-attr">"dimensions"</span>: [],
+    <span class="hljs-attr">"type"</span>: <span class="hljs-string">"counter"</span>
+  },
+  <span class="hljs-attr">"query/cache/delta/errors"</span>: {
+    <span class="hljs-attr">"dimensions"</span>: [],
+    <span class="hljs-attr">"type"</span>: <span class="hljs-string">"counter"</span>
+  },
+  <span class="hljs-attr">"query/cache/total/numEntries"</span>: {
+    <span class="hljs-attr">"dimensions"</span>: [],
+    <span class="hljs-attr">"type"</span>: <span class="hljs-string">"gauge"</span>
+  },
+  <span class="hljs-attr">"query/cache/total/sizeBytes"</span>: {
+    <span class="hljs-attr">"dimensions"</span>: [],
+    <span class="hljs-attr">"type"</span>: <span class="hljs-string">"gauge"</span>
+  },
+  <span class="hljs-attr">"query/cache/total/hits"</span>: {
+    <span class="hljs-attr">"dimensions"</span>: [],
+    <span class="hljs-attr">"type"</span>: <span class="hljs-string">"gauge"</span>
+  },
+  <span class="hljs-attr">"query/cache/total/misses"</span>: {
+    <span class="hljs-attr">"dimensions"</span>: [],
+    <span class="hljs-attr">"type"</span>: <span class="hljs-string">"gauge"</span>
+  },
+  <span class="hljs-attr">"query/cache/total/evictions"</span>: {
+    <span class="hljs-attr">"dimensions"</span>: [],
+    <span class="hljs-attr">"type"</span>: <span class="hljs-string">"gauge"</span>
+  },
+  <span class="hljs-attr">"query/cache/total/hitRate"</span>: {
+    <span class="hljs-attr">"dimensions"</span>: [],
+    <span class="hljs-attr">"type"</span>: <span class="hljs-string">"gauge"</span>
+  },
+  <span class="hljs-attr">"query/cache/total/averageBytes"</span>: {
+    <span class="hljs-attr">"dimensions"</span>: [],
+    <span class="hljs-attr">"type"</span>: <span class="hljs-string">"gauge"</span>
+  },
+  <span class="hljs-attr">"query/cache/total/timeouts"</span>: {
+    <span class="hljs-attr">"dimensions"</span>: [],
+    <span class="hljs-attr">"type"</span>: <span class="hljs-string">"gauge"</span>
+  },
+  <span class="hljs-attr">"query/cache/total/errors"</span>: {
+    <span class="hljs-attr">"dimensions"</span>: [],
+    <span class="hljs-attr">"type"</span>: <span class="hljs-string">"gauge"</span>
+  },
+  <span class="hljs-attr">"ingest/events/thrownAway"</span>: {
+    <span class="hljs-attr">"dimensions"</span>: [
+      <span class="hljs-string">"dataSource"</span>
+    ],
+    <span class="hljs-attr">"type"</span>: <span class="hljs-string">"counter"</span>
+  },
+  <span class="hljs-attr">"ingest/events/unparseable"</span>: {
+    <span class="hljs-attr">"dimensions"</span>: [
+      <span class="hljs-string">"dataSource"</span>
+    ],
+    <span class="hljs-attr">"type"</span>: <span class="hljs-string">"counter"</span>
+  },
+  <span class="hljs-attr">"ingest/events/duplicate"</span>: {
+    <span class="hljs-attr">"dimensions"</span>: [
+      <span class="hljs-string">"dataSource"</span>
+    ],
+    <span class="hljs-attr">"type"</span>: <span class="hljs-string">"counter"</span>
+  },
+  <span class="hljs-attr">"ingest/events/processed"</span>: {
+    <span class="hljs-attr">"dimensions"</span>: [
+      <span class="hljs-string">"dataSource"</span>
+    ],
+    <span class="hljs-attr">"type"</span>: <span class="hljs-string">"counter"</span>
+  },
+  <span class="hljs-attr">"ingest/rows/output"</span>: {
+    <span class="hljs-attr">"dimensions"</span>: [
+      <span class="hljs-string">"dataSource"</span>
+    ],
+    <span class="hljs-attr">"type"</span>: <span class="hljs-string">"counter"</span>
+  },
+  <span class="hljs-attr">"ingest/persist/counter"</span>: {
+    <span class="hljs-attr">"dimensions"</span>: [
+      <span class="hljs-string">"dataSource"</span>
+    ],
+    <span class="hljs-attr">"type"</span>: <span class="hljs-string">"counter"</span>
+  },
+  <span class="hljs-attr">"ingest/persist/time"</span>: {
+    <span class="hljs-attr">"dimensions"</span>: [
+      <span class="hljs-string">"dataSource"</span>
+    ],
+    <span class="hljs-attr">"type"</span>: <span class="hljs-string">"timer"</span>,
+    <span class="hljs-attr">"timeUnit"</span>: <span class="hljs-string">"MILLISECONDS"</span>
+  },
+  <span class="hljs-attr">"ingest/persist/cpu"</span>: {
+    <span class="hljs-attr">"dimensions"</span>: [
+      <span class="hljs-string">"dataSource"</span>
+    ],
+    <span class="hljs-attr">"type"</span>: <span class="hljs-string">"timer"</span>,
+    <span class="hljs-attr">"timeUnit"</span>: <span class="hljs-string">"NANOSECONDS"</span>
+  },
+  <span class="hljs-attr">"ingest/persist/backPressure"</span>: {
+    <span class="hljs-attr">"dimensions"</span>: [
+      <span class="hljs-string">"dataSource"</span>
+    ],
+    <span class="hljs-attr">"type"</span>: <span class="hljs-string">"gauge"</span>
+  },
+  <span class="hljs-attr">"ingest/persist/failed"</span>: {
+    <span class="hljs-attr">"dimensions"</span>: [
+      <span class="hljs-string">"dataSource"</span>
+    ],
+    <span class="hljs-attr">"type"</span>: <span class="hljs-string">"counter"</span>
+  },
+  <span class="hljs-attr">"ingest/handoff/failed"</span>: {
+    <span class="hljs-attr">"dimensions"</span>: [
+      <span class="hljs-string">"dataSource"</span>
+    ],
+    <span class="hljs-attr">"type"</span>: <span class="hljs-string">"counter"</span>
+  },
+  <span class="hljs-attr">"ingest/merge/time"</span>: {
+    <span class="hljs-attr">"dimensions"</span>: [
+      <span class="hljs-string">"dataSource"</span>
+    ],
+    <span class="hljs-attr">"type"</span>: <span class="hljs-string">"timer"</span>,
+    <span class="hljs-attr">"timeUnit"</span>: <span class="hljs-string">"MILLISECONDS"</span>
+  },
+  <span class="hljs-attr">"ingest/merge/cpu"</span>: {
+    <span class="hljs-attr">"dimensions"</span>: [
+      <span class="hljs-string">"dataSource"</span>
+    ],
+    <span class="hljs-attr">"type"</span>: <span class="hljs-string">"timer"</span>,
+    <span class="hljs-attr">"timeUnit"</span>: <span class="hljs-string">"NANOSECONDS"</span>
+  },
+  <span class="hljs-attr">"task/run/time"</span>: {
+    <span class="hljs-attr">"dimensions"</span>: [
+      <span class="hljs-string">"dataSource"</span>,
+      <span class="hljs-string">"taskType"</span>
+    ],
+    <span class="hljs-attr">"type"</span>: <span class="hljs-string">"timer"</span>,
+    <span class="hljs-attr">"timeUnit"</span>: <span class="hljs-string">"MILLISECONDS"</span>
+  },
+  <span class="hljs-attr">"segment/added/bytes"</span>: {
+    <span class="hljs-attr">"dimensions"</span>: [
+      <span class="hljs-string">"dataSource"</span>,
+      <span class="hljs-string">"taskType"</span>
+    ],
+    <span class="hljs-attr">"type"</span>: <span class="hljs-string">"counter"</span>
+  },
+  <span class="hljs-attr">"segment/moved/bytes"</span>: {
+    <span class="hljs-attr">"dimensions"</span>: [
+      <span class="hljs-string">"dataSource"</span>,
+      <span class="hljs-string">"taskType"</span>
+    ],
+    <span class="hljs-attr">"type"</span>: <span class="hljs-string">"counter"</span>
+  },
+  <span class="hljs-attr">"segment/nuked/bytes"</span>: {
+    <span class="hljs-attr">"dimensions"</span>: [
+      <span class="hljs-string">"dataSource"</span>,
+      <span class="hljs-string">"taskType"</span>
+    ],
+    <span class="hljs-attr">"type"</span>: <span class="hljs-string">"counter"</span>
+  },
+  <span class="hljs-attr">"segment/assigned/counter"</span>: {
+    <span class="hljs-attr">"dimensions"</span>: [
+      <span class="hljs-string">"tier"</span>
+    ],
+    <span class="hljs-attr">"type"</span>: <span class="hljs-string">"counter"</span>
+  },
+  <span class="hljs-attr">"segment/moved/counter"</span>: {
+    <span class="hljs-attr">"dimensions"</span>: [
+      <span class="hljs-string">"tier"</span>
+    ],
+    <span class="hljs-attr">"type"</span>: <span class="hljs-string">"counter"</span>
+  },
+  <span class="hljs-attr">"segment/dropped/counter"</span>: {
+    <span class="hljs-attr">"dimensions"</span>: [
+      <span class="hljs-string">"tier"</span>
+    ],
+    <span class="hljs-attr">"type"</span>: <span class="hljs-string">"counter"</span>
+  },
+  <span class="hljs-attr">"segment/deleted/counter"</span>: {
+    <span class="hljs-attr">"dimensions"</span>: [
+      <span class="hljs-string">"tier"</span>
+    ],
+    <span class="hljs-attr">"type"</span>: <span class="hljs-string">"counter"</span>
+  },
+  <span class="hljs-attr">"segment/unneeded/counter"</span>: {
+    <span class="hljs-attr">"dimensions"</span>: [
+      <span class="hljs-string">"tier"</span>
+    ],
+    <span class="hljs-attr">"type"</span>: <span class="hljs-string">"counter"</span>
+  },
+  <span class="hljs-attr">"segment/cost/raw"</span>: {
+    <span class="hljs-attr">"dimensions"</span>: [
+      <span class="hljs-string">"tier"</span>
+    ],
+    <span class="hljs-attr">"type"</span>: <span class="hljs-string">"counter"</span>
+  },
+  <span class="hljs-attr">"segment/cost/normalization"</span>: {
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+}
+</code></pre>
+</span></div></article></div><div class="docs-prevnext"></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#introduction">Introduction</a></li><li><a href="#configuration">Configuration</a><ul class="toc-headings"><li><a href="#druid-to-dropwizard-event-conversion">Druid to Dropwizard Event Conversion</a></li><li><a href="#supported-dropwizard-reporters">Supported Dropwizard reporters</a></li><li><a href="#default-metrics-mapping">Default Metrics Mapping</a></li></ul></li></ul></nav></div><footer class="nav-footer druid-footer" id="footer"><div class="container"><div class="text-center"><p><a href="/technology">Technology</a> · <a href="/use-cases">Use Cases</a> · <a href="/druid-powered">Powered by Druid</a> · <a href="/docs/0.20.0/latest">Docs</a> · <a href="/community/">Community</a> · <a href="/downloads.html">Download</a> · <a href="/faq">FAQ</a></p></div><div class="text-center"><a title="Join the user group" href="https://groups.google.com/forum/#!forum/druid-user" target="_blank"><span class="fa fa-comments"></span></a> · <a title="Follow Druid" href="https://twitter.com/druidio" target="_blank"><span class="fab fa-twitter"></span></a> · <a title="Download via Apache" href="https://www.apache.org/dyn/closer.cgi?path=/incubator/druid/{{ site.druid_versions[0].versions[0].version }}/apache-druid-{{ site.druid_versions[0].versions[0].version }}-bin.tar.gz" target="_blank"><span class="fas fa-feather"></span></a> · <a title="GitHub" href="https://github.com/apache/druid" target="_blank"><span class="fab fa-github"></span></a></div><div class="text-center license">Copyright © 2019 <a href="https://www.apache.org/" target="_blank">Apache Software Foundation</a>.<br/>Except where otherwise noted, licensed under <a rel="license" href="http://creativecommons.org/licenses/by-sa/4.0/">CC BY-SA 4.0</a>.<br/>Apache Druid, Druid, and the Druid logo are either registered trademarks or trademarks of The Apache Software Foundation in the United States and other countries.</div></div></footer></div><script type="text/javascript" src="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.js"></script><script>
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+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Historical Process · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/0.20.0/design/historical.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.20.0" /><meta property="og:title" content="Historical Process · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
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class="icon-toc"></i></div></div><div class="navGroups"><div class="navGroup"><h3 class="navGroupCategoryTitle collapsible">Getting started<span class="arrow"><svg width="24" height="24" viewBox="0 0 24 24"><path fill="#565656" d="M7.41 15.41L12 10.83l4.59 4.58L18 14l-6-6-6 6z"></path><path d="M0 0h24v24H0z" fill="none"></path></svg></span></h3><ul class="hide"><li class="navListItem"><a class="navItem" href="/docs/0.20.0/design/index.html">Introduction to Apache Druid</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/tutorials/index.html">Quickstart</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/tutorials/docker.html">Docker</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/operations/single-server.html">Single server deployment</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/tutorials/cluster.html">Clustered deployment</a></li></ul></div><div class="navGroup"><h3 class="navGroupCategoryTitle 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+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+  -->
+<h3><a class="anchor" aria-hidden="true" id="configuration"></a><a href="#configuration" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Configuration</h3>
+<p>For Apache Druid Historical Process Configuration, see <a href="../configuration/index.html#historical">Historical Configuration</a>.</p>
+<h3><a class="anchor" aria-hidden="true" id="http-endpoints"></a><a href="#http-endpoints" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>HTTP endpoints</h3>
+<p>For a list of API endpoints supported by the Historical, please see the <a href="../operations/api-reference.html#historical">API reference</a>.</p>
+<h3><a class="anchor" aria-hidden="true" id="running"></a><a href="#running" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Running</h3>
+<pre><code class="hljs">org.apache.druid.cli.Main<span class="hljs-built_in"> server </span>historical
+</code></pre>
+<h3><a class="anchor" aria-hidden="true" id="loading-and-serving-segments"></a><a href="#loading-and-serving-segments" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Loading and serving segments</h3>
+<p>Each Historical process maintains a constant connection to Zookeeper and watches a configurable set of Zookeeper paths for new segment information. Historical processes do not communicate directly with each other or with the Coordinator processes but instead rely on Zookeeper for coordination.</p>
+<p>The <a href="/docs/0.20.0/design/coordinator.html">Coordinator</a> process is responsible for assigning new segments to Historical processes. Assignment is done by creating an ephemeral Zookeeper entry under a load queue path associated with a Historical process. For more information on how the Coordinator assigns segments to Historical processes, please see <a href="/docs/0.20.0/design/coordinator.html">Coordinator</a>.</p>
+<p>When a Historical process notices a new load queue entry in its load queue path, it will first check a local disk directory (cache) for the information about segment. If no information about the segment exists in the cache, the Historical process will download metadata about the new segment to serve from Zookeeper. This metadata includes specifications about where the segment is located in deep storage and about how to decompress and process the segment. For more information about segment metadata and Druid segments in general, please see <a href="/docs/0.20.0/design/segments.html">Segments</a>. Once a Historical process completes processing a segment, the segment is announced in Zookeeper under a served segments path associated with the process. At this point, the segment is available for querying.</p>
+<h3><a class="anchor" aria-hidden="true" id="loading-and-serving-segments-from-cache"></a><a href="#loading-and-serving-segments-from-cache" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Loading and serving segments from cache</h3>
+<p>Recall that when a Historical process notices a new segment entry in its load queue path, the Historical process first checks a configurable cache directory on its local disk to see if the segment had been previously downloaded. If a local cache entry already exists, the Historical process will directly read the segment binary files from disk and load the segment.</p>
+<p>The segment cache is also leveraged when a Historical process is first started. On startup, a Historical process will search through its cache directory and immediately load and serve all segments that are found. This feature allows Historical processes to be queried as soon they come online.</p>
+<h3><a class="anchor" aria-hidden="true" id="querying-segments"></a><a href="#querying-segments" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Querying segments</h3>
+<p>Please see <a href="/docs/0.20.0/querying/querying.html">Querying</a> for more information on querying Historical processes.</p>
+<p>A Historical can be configured to log and report metrics for every query it services.</p>
+</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/0.20.0/design/coordinator.html"><span class="arrow-prev">← </span><span>Coordinator Process</span></a><a class="docs-next button" href="/docs/0.20.0/design/indexer.html"><span>Indexer Process</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"></nav></div><footer class="nav-footer druid-footer" id="footer"><div class="container"><div class="text-center"><p><a href="/technology">Technology</a> · <a href="/use-cases">Use Cases</a> · <a href="/druid-powered">Powered by Druid</a> · <a href="/docs/0.20.0/latest">Docs</a> · <a href="/community/">Community</a> · <a href="/downloads.html">Download</a> · <a href="/faq">FAQ</a></p></div><div class="text-center"><a title="Join the user group" href="https://groups.google.com/forum/#!forum/druid-user" target="_blank"><span class="fa fa-comments"></span></a> · <a title="Follow Druid" href="https://twitter.com/druidio" target="_blank"><span class="fab fa-twitter"></span></a> · <a title="Download via Apache" href="https://www.apache.org/dyn/closer.cgi?path=/incubator/druid/{{ site.druid_versions[0].versions[0].version }}/apache-druid-{{ site.druid_versions[0].versions[0].version }}-bin.tar.gz" target="_blank"><span class="fas fa-feather"></span></a> · <a title="GitHub" href="https://github.com/apache/druid" target="_blank"><span class="fab fa-github"></span></a></div><div class="text-center license">Copyright © 2019 <a href="https://www.apache.org/" target="_blank">Apache Software Foundation</a>.<br/>Except where otherwise noted, licensed under <a rel="license" href="http://creativecommons.org/licenses/by-sa/4.0/">CC BY-SA 4.0</a>.<br/>Apache Druid, Druid, and the Druid logo are either registered trademarks or trademarks of The Apache Software Foundation in the United States and other countries.</div></div></footer></div><script type="text/javascript" src="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.js"></script><script>
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UIs</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/operations/deep-storage-migration.html">Deep storage migration</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/operations/export-metadata.html">Export Metadata Tool</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/operations/metadata-migration.html">Metadata Migration</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/operations/segment-optimization.html">Segment Size Optimization</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/operations/use_sbt_to_build_fat_jar.html">Content for build.sbt</a></li></ul></div></ul></div><div class="navGroup"><h3 class="navGroupCategoryTitle collapsible">Development<span class="arrow"><svg width="24" height="24" viewBox="0 0 24 24"><path fill="#565656" d="M7.41 15.41L12 10.83l4.59 4.58L18 14l-6-6-6 6z"></path><path d="M0 0h24v24H0z" fill="none"></path></svg></span></h3><ul class="hide"><li 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+<h2><a class="anchor" aria-hidden="true" id="what-is-druid"></a><a href="#what-is-druid" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>What is Druid?</h2>
+<p>Apache Druid is a real-time analytics database designed for fast slice-and-dice analytics
+(&quot;<a href="http://en.wikipedia.org/wiki/Online_analytical_processing">OLAP</a>&quot; queries) on large data sets. Druid is most often
+used as a database for powering use cases where real-time ingest, fast query performance, and high uptime are important.
+As such, Druid is commonly used for powering GUIs of analytical applications, or as a backend for highly-concurrent APIs
+that need fast aggregations. Druid works best with event-oriented data.</p>
+<p>Common application areas for Druid include:</p>
+<ul>
+<li>Clickstream analytics (web and mobile analytics)</li>
+<li>Network telemetry analytics (network performance monitoring)</li>
+<li>Server metrics storage</li>
+<li>Supply chain analytics (manufacturing metrics)</li>
+<li>Application performance metrics</li>
+<li>Digital marketing/advertising analytics</li>
+<li>Business intelligence / OLAP</li>
+</ul>
+<p>Druid's core architecture combines ideas from data warehouses, timeseries databases, and logsearch systems. Some of
+Druid's key features are:</p>
+<ol>
+<li><strong>Columnar storage format.</strong> Druid uses column-oriented storage, meaning it only needs to load the exact columns
+needed for a particular query.  This gives a huge speed boost to queries that only hit a few columns. In addition, each
+column is stored optimized for its particular data type, which supports fast scans and aggregations.</li>
+<li><strong>Scalable distributed system.</strong> Druid is typically deployed in clusters of tens to hundreds of servers, and can
+offer ingest rates of millions of records/sec, retention of trillions of records, and query latencies of sub-second to a
+few seconds.</li>
+<li><strong>Massively parallel processing.</strong> Druid can process a query in parallel across the entire cluster.</li>
+<li><strong>Realtime or batch ingestion.</strong> Druid can ingest data either real-time (ingested data is immediately available for
+querying) or in batches.</li>
+<li><strong>Self-healing, self-balancing, easy to operate.</strong> As an operator, to scale the cluster out or in, simply add or
+remove servers and the cluster will rebalance itself automatically, in the background, without any downtime. If any
+Druid servers fail, the system will automatically route around the damage until those servers can be replaced. Druid
+is designed to run 24/7 with no need for planned downtimes for any reason, including configuration changes and software
+updates.</li>
+<li><strong>Cloud-native, fault-tolerant architecture that won't lose data.</strong> Once Druid has ingested your data, a copy is
+stored safely in <a href="architecture.html#deep-storage">deep storage</a> (typically cloud storage, HDFS, or a shared filesystem).
+Your data can be recovered from deep storage even if every single Druid server fails. For more limited failures affecting
+just a few Druid servers, replication ensures that queries are still possible while the system recovers.</li>
+<li><strong>Indexes for quick filtering.</strong> Druid uses <a href="https://roaringbitmap.org/">Roaring</a> or
+<a href="https://arxiv.org/pdf/1004.0403">CONCISE</a> compressed bitmap indexes to create indexes that power fast filtering and
+searching across multiple columns.</li>
+<li><strong>Time-based partitioning.</strong> Druid first partitions data by time, and can additionally partition based on other fields.
+This means time-based queries will only access the partitions that match the time range of the query. This leads to
+significant performance improvements for time-based data.</li>
+<li><strong>Approximate algorithms.</strong> Druid includes algorithms for approximate count-distinct, approximate ranking, and
+computation of approximate histograms and quantiles. These algorithms offer bounded memory usage and are often
+substantially faster than exact computations. For situations where accuracy is more important than speed, Druid also
+offers exact count-distinct and exact ranking.</li>
+<li><strong>Automatic summarization at ingest time.</strong> Druid optionally supports data summarization at ingestion time. This
+summarization partially pre-aggregates your data, and can lead to big costs savings and performance boosts.</li>
+</ol>
+<h2><a class="anchor" aria-hidden="true" id="when-should-i-use-druid"></a><a href="#when-should-i-use-druid" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>When should I use Druid?</h2>
+<p>Druid is used by many companies of various sizes for many different use cases. Check out the
+<a href="/druid-powered">Powered by Apache Druid</a> page</p>
+<p>Druid is likely a good choice if your use case fits a few of the following descriptors:</p>
+<ul>
+<li>Insert rates are very high, but updates are less common.</li>
+<li>Most of your queries are aggregation and reporting queries (&quot;group by&quot; queries). You may also have searching and
+scanning queries.</li>
+<li>You are targeting query latencies of 100ms to a few seconds.</li>
+<li>Your data has a time component (Druid includes optimizations and design choices specifically related to time).</li>
+<li>You may have more than one table, but each query hits just one big distributed table. Queries may potentially hit more
+than one smaller &quot;lookup&quot; table.</li>
+<li>You have high cardinality data columns (e.g. URLs, user IDs) and need fast counting and ranking over them.</li>
+<li>You want to load data from Kafka, HDFS, flat files, or object storage like Amazon S3.</li>
+</ul>
+<p>Situations where you would likely <em>not</em> want to use Druid include:</p>
+<ul>
+<li>You need low-latency updates of <em>existing</em> records using a primary key. Druid supports streaming inserts, but not streaming updates (updates are done using
+background batch jobs).</li>
+<li>You are building an offline reporting system where query latency is not very important.</li>
+<li>You want to do &quot;big&quot; joins (joining one big fact table to another big fact table) and you are okay with these queries
+taking a long time to complete.</li>
+</ul>
+</span></div></article></div><div class="docs-prevnext"><a class="docs-next button" href="/docs/0.20.0/tutorials/index.html"><span>Quickstart</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#what-is-druid">What is Druid?</a></li><li><a href="#when-should-i-use-druid">When should I use Druid?</a></li></ul></nav></div><footer class="nav-footer druid-footer" id="footer"><div class="container"><div class="text-center"><p><a href="/technology">Technology</a> · <a href="/use-cases">Use Cases</a> · <a href="/druid-powered">Powered by Druid</a> · <a href="/docs/0.20.0/latest">Docs</a> · <a href="/community/">Community</a> · <a href="/downloads.html">Download</a> · <a href="/faq">FAQ</a></p></div><div class="text-center"><a title="Join the user group" href="https://groups.google.com/forum/#!forum/druid-user" target="_blank"><span class="fa fa-comments"></span></a> · <a title="Follow Druid" href="https://twitter.com/druidio" target="_blank"><span class="fab fa-twitter"></span></a> · <a title="Download via Apache" href="https://www.apache.org/dyn/closer.cgi?path=/incubator/druid/{{ site.druid_versions[0].versions[0].version }}/apache-druid-{{ site.druid_versions[0].versions[0].version }}-bin.tar.gz" target="_blank"><span class="fas fa-feather"></span></a> · <a title="GitHub" href="https://github.com/apache/druid" target="_blank"><span class="fab fa-github"></span></a></div><div class="text-center license">Copyright © 2019 <a href="https://www.apache.org/" target="_blank">Apache Software Foundation</a>.<br/>Except where otherwise noted, licensed under <a rel="license" href="http://creativecommons.org/licenses/by-sa/4.0/">CC BY-SA 4.0</a>.<br/>Apache Druid, Druid, and the Druid logo are either registered trademarks or trademarks of The Apache Software Foundation in the United States and other countries.</div></div></footer></div><script type="text/javascript" src="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.js"></script><script>
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+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Indexer Process · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/0.20.0/design/indexer.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.20.0" /><meta property="og:title" content="Indexer Process · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
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+<blockquote>
+<p>The Indexer is an optional and <a href="../development/experimental.html">experimental</a> feature.
+Its memory management system is still under development and will be significantly enhanced in later releases.</p>
+</blockquote>
+<p>The Apache Druid Indexer process is an alternative to the MiddleManager + Peon task execution system. Instead of forking a separate JVM process per-task, the Indexer runs tasks as separate threads within a single JVM process.</p>
+<p>The Indexer is designed to be easier to configure and deploy compared to the MiddleManager + Peon system and to better enable resource sharing across tasks.</p>
+<h3><a class="anchor" aria-hidden="true" id="configuration"></a><a href="#configuration" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Configuration</h3>
+<p>For Apache Druid Indexer Process Configuration, see <a href="../configuration/index.html#indexer">Indexer Configuration</a>.</p>
+<h3><a class="anchor" aria-hidden="true" id="http-endpoints"></a><a href="#http-endpoints" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>HTTP endpoints</h3>
+<p>The Indexer process shares the same HTTP endpoints as the <a href="../operations/api-reference.html#middlemanager">MiddleManager</a>.</p>
+<h3><a class="anchor" aria-hidden="true" id="running"></a><a href="#running" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Running</h3>
+<pre><code class="hljs">org.apache.druid.cli.Main<span class="hljs-built_in"> server </span>indexer
+</code></pre>
+<h3><a class="anchor" aria-hidden="true" id="task-resource-sharing"></a><a href="#task-resource-sharing" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Task resource sharing</h3>
+<p>The following resources are shared across all tasks running inside an Indexer process.</p>
+<h4><a class="anchor" aria-hidden="true" id="query-resources"></a><a href="#query-resources" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Query resources</h4>
+<p>The query processing threads and buffers are shared across all tasks. The Indexer will serve queries from a single endpoint shared by all tasks.</p>
+<p>If <a href="../configuration/index.html#indexer-caching">query caching</a> is enabled, the query cache is also shared across all tasks.</p>
+<h4><a class="anchor" aria-hidden="true" id="server-http-threads"></a><a href="#server-http-threads" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Server HTTP threads</h4>
+<p>The Indexer maintains two equally sized pools of HTTP threads.</p>
+<p>One pool is exclusively used for task control messages between the Overlord and the Indexer (&quot;chat handler threads&quot;). The other pool is used for handling all other HTTP requests.</p>
+<p>The size of the pools are configured by the <code>druid.server.http.numThreads</code> configuration (e.g., if this is set to 10, there will be 10 chat handler threads and 10 non-chat handler threads).</p>
+<p>In addition to these two pools, 2 separate threads are allocated for lookup handling. If lookups are not used, these threads will not be used.</p>
+<h4><a class="anchor" aria-hidden="true" id="memory-sharing"></a><a href="#memory-sharing" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Memory sharing</h4>
+<p>The Indexer uses the <code>druid.worker.globalIngestionHeapLimitBytes</code> configuration to impose a global heap limit across all of the tasks it is running.</p>
+<p>This global limit is evenly divided across the number of task slots configured by <code>druid.worker.capacity</code>.</p>
+<p>To apply the per-task heap limit, the Indexer will override <code>maxBytesInMemory</code> in task tuning configs (i.e., ignoring the default value or any user configured value). <code>maxRowsInMemory</code> will also be overridden to an essentially unlimited value: the Indexer does not support row limits.</p>
+<p>By default, <code>druid.worker.globalIngestionHeapLimitBytes</code> is set to 1/6th of the available JVM heap. This default is chosen to align with the default value of <code>maxBytesInMemory</code> in task tuning configs when using the MiddleManager/Peon system, which is also 1/6th of the JVM heap.</p>
+<p>The peak usage for rows held in heap memory relates to the interaction between the <code>maxBytesInMemory</code> and <code>maxPendingPersists</code> properties in the task tuning configs. When the amount of row data held in-heap by a task reaches the limit specified by <code>maxBytesInMemory</code>, a task will persist the in-heap row data. After the persist has been started, the task can again ingest up to <code>maxBytesInMemory</code> bytes worth of row data while the persist is running.</p>
+<p>This means that the peak in-heap usage for row data can be up to approximately <code>maxBytesInMemory</code> * (2 + <code>maxPendingPersists</code>). The default value of <code>maxPendingPersists</code> is 0, which allows for 1 persist to run concurrently with ingestion work.</p>
+<p>The remaining portion of the heap is reserved for query processing and segment persist/merge operations, and miscellaneous heap usage.</p>
+<h4><a class="anchor" aria-hidden="true" id="concurrent-segment-persistmerge-limits"></a><a href="#concurrent-segment-persistmerge-limits" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Concurrent segment persist/merge limits</h4>
+<p>To help reduce peak memory usage, the Indexer imposes a limit on the number of concurrent segment persist/merge operations across all running tasks.</p>
+<p>By default, the number of concurrent persist/merge operations is limited to (<code>druid.worker.capacity</code> / 2), rounded down. This limit can be configured with the <code>druid.worker.numConcurrentMerges</code> property.</p>
+<h3><a class="anchor" aria-hidden="true" id="current-limitations"></a><a href="#current-limitations" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Current limitations</h3>
+<p>Separate task logs are not currently supported when using the Indexer; all task log messages will instead be logged in the Indexer process log.</p>
+<p>The Indexer currently imposes an identical memory limit on each task. In later releases, the per-task memory limit will be removed and only the global limit will apply. The limit on concurrent merges will also be removed.</p>
+<p>In later releases, per-task memory usage will be dynamically managed. Please see <a href="https://github.com/apache/druid/issues/7900">https://github.com/apache/druid/issues/7900</a> for details on future enhancements to the Indexer.</p>
+</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/0.20.0/design/historical.html"><span class="arrow-prev">← </span><span>Historical Process</span></a><a class="docs-next button" href="/docs/0.20.0/design/indexing-service.html"><span>Indexing Service</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"></nav></div><footer class="nav-footer druid-footer" id="footer"><div class="container"><div class="text-center"><p><a href="/technology">Technology</a> · <a href="/use-cases">Use Cases</a> · <a href="/druid-powered">Powered by Druid</a> · <a href="/docs/0.20.0/latest">Docs</a> · <a href="/community/">Community</a> · <a href="/downloads.html">Download</a> · <a href="/faq">FAQ</a></p></div><div class="text-center"><a title="Join the user group" href="https://groups.google.com/forum/#!forum/druid-user" target="_blank"><span class="fa fa-comments"></span></a> · <a title="Follow Druid" href="https://twitter.com/druidio" target="_blank"><span class="fab fa-twitter"></span></a> · <a title="Download via Apache" href="https://www.apache.org/dyn/closer.cgi?path=/incubator/druid/{{ site.druid_versions[0].versions[0].version }}/apache-druid-{{ site.druid_versions[0].versions[0].version }}-bin.tar.gz" target="_blank"><span class="fas fa-feather"></span></a> · <a title="GitHub" href="https://github.com/apache/druid" target="_blank"><span class="fab fa-github"></span></a></div><div class="text-center license">Copyright © 2019 <a href="https://www.apache.org/" target="_blank">Apache Software Foundation</a>.<br/>Except where otherwise noted, licensed under <a rel="license" href="http://creativecommons.org/licenses/by-sa/4.0/">CC BY-SA 4.0</a>.<br/>Apache Druid, Druid, and the Druid logo are either registered trademarks or trademarks of The Apache Software Foundation in the United States and other countries.</div></div></footer></div><script type="text/javascript" src="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.js"></script><script>
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+<p>The Apache Druid indexing service is a highly-available, distributed service that runs indexing related tasks.</p>
+<p>Indexing <a href="/docs/0.20.0/ingestion/tasks.html">tasks</a> create (and sometimes destroy) Druid <a href="/docs/0.20.0/design/segments.html">segments</a>. The indexing service has a master/slave like architecture.</p>
+<p>The indexing service is composed of three main components: a <a href="/docs/0.20.0/design/peons.html">Peon</a> component that can run a single task, a <a href="/docs/0.20.0/design/middlemanager.html">Middle Manager</a> component that manages Peons, and an <a href="/docs/0.20.0/design/overlord.html">Overlord</a> component that manages task distribution to MiddleManagers.
+Overlords and MiddleManagers may run on the same process or across multiple processes while MiddleManagers and Peons always run on the same process.</p>
+<p>Tasks are managed using API endpoints on the Overlord service. Please see <a href="../operations/api-reference.html#tasks">Overlord Task API</a> for more information.</p>
+<p><img src="../assets/indexing_service.png" alt="Indexing Service" title="Indexing Service"></p>
+<h2><a class="anchor" aria-hidden="true" id="overlord"></a><a href="#overlord" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Overlord</h2>
+<p>See <a href="/docs/0.20.0/design/overlord.html">Overlord</a>.</p>
+<h2><a class="anchor" aria-hidden="true" id="middle-managers"></a><a href="#middle-managers" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Middle Managers</h2>
+<p>See <a href="/docs/0.20.0/design/middlemanager.html">Middle Manager</a>.</p>
+<h2><a class="anchor" aria-hidden="true" id="peons"></a><a href="#peons" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Peons</h2>
+<p>See <a href="/docs/0.20.0/design/peons.html">Peon</a>.</p>
+<h2><a class="anchor" aria-hidden="true" id="tasks"></a><a href="#tasks" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Tasks</h2>
+<p>See <a href="/docs/0.20.0/ingestion/tasks.html">Tasks</a>.</p>
+</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/0.20.0/design/indexer.html"><span class="arrow-prev">← </span><span>Indexer Process</span></a><a class="docs-next button" href="/docs/0.20.0/design/middlemanager.html"><span class="function-name-prevnext">MiddleManager Process</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#overlord">Overlord</a></li><li><a href="#middle-managers">Middle Managers</a></li><li><a href="#peons">Peons</a></li><li><a href="#tasks">Tasks</a></li></ul></nav></div><footer class="nav-footer druid-footer" id="footer"><div class="container"><div class="text-center"><p><a href="/technology">Technology</a> · <a href="/use-cases">Use Cases</a> · <a href="/druid-powered">Powered by Druid</a> · <a href="/docs/0.20.0/latest">Docs</a> · <a href="/community/">Community</a> · <a href="/downloads.html">Download</a> · <a href="/faq">FAQ</a></p></div><div class="text-center"><a title="Join the user group" href="https://groups.google.com/forum/#!forum/druid-user" target="_blank"><span class="fa fa-comments"></span></a> · <a title="Follow Druid" href="https://twitter.com/druidio" target="_blank"><span class="fab fa-twitter"></span></a> · <a title="Download via Apache" href="https://www.apache.org/dyn/closer.cgi?path=/incubator/druid/{{ site.druid_versions[0].versions[0].version }}/apache-druid-{{ site.druid_versions[0].versions[0].version }}-bin.tar.gz" target="_blank"><span class="fas fa-feather"></span></a> · <a title="GitHub" href="https://github.com/apache/druid" target="_blank"><span class="fab fa-github"></span></a></div><div class="text-center license">Copyright © 2019 <a href="https://www.apache.org/" target="_blank">Apache Software Foundation</a>.<br/>Except where otherwise noted, licensed under <a rel="license" href="http://creativecommons.org/licenses/by-sa/4.0/">CC BY-SA 4.0</a>.<br/>Apache Druid, Druid, and the Druid logo are either registered trademarks or trademarks of The Apache Software Foundation in the United States and other countries.</div></div></footer></div><script type="text/javascript" src="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.js"></script><script>
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+<h3><a class="anchor" aria-hidden="true" id="configuration"></a><a href="#configuration" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Configuration</h3>
+<p>For Apache Druid MiddleManager Process Configuration, see <a href="../configuration/index.html#middlemanager-and-peons">Indexing Service Configuration</a>.</p>
+<h3><a class="anchor" aria-hidden="true" id="http-endpoints"></a><a href="#http-endpoints" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>HTTP endpoints</h3>
+<p>For a list of API endpoints supported by the MiddleManager, please see the <a href="../operations/api-reference.html#middlemanager">API reference</a>.</p>
+<h3><a class="anchor" aria-hidden="true" id="overview"></a><a href="#overview" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Overview</h3>
+<p>The MiddleManager process is a worker process that executes submitted tasks. Middle Managers forward tasks to Peons that run in separate JVMs.
+The reason we have separate JVMs for tasks is for resource and log isolation. Each <a href="/docs/0.20.0/design/peons.html">Peon</a> is capable of running only one task at a time, however, a MiddleManager may have multiple Peons.</p>
+<h3><a class="anchor" aria-hidden="true" id="running"></a><a href="#running" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Running</h3>
+<pre><code class="hljs">org.apache.druid.cli.Main<span class="hljs-built_in"> server </span>middleManager
+</code></pre>
+</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/0.20.0/design/indexing-service.html"><span class="arrow-prev">← </span><span>Indexing Service</span></a><a class="docs-next button" href="/docs/0.20.0/design/overlord.html"><span>Overlord Process</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"></nav></div><footer class="nav-footer druid-footer" id="footer"><div class="container"><div class="text-center"><p><a href="/technology">Technology</a> · <a href="/use-cases">Use Cases</a> · <a href="/druid-powered">Powered by Druid</a> · <a href="/docs/0.20.0/latest">Docs</a> · <a href="/community/">Community</a> · <a href="/downloads.html">Download</a> · <a href="/faq">FAQ</a></p></div><div class="text-center"><a title="Join the user group" href="https://groups.google.com/forum/#!forum/druid-user" target="_blank"><span class="fa fa-comments"></span></a> · <a title="Follow Druid" href="https://twitter.com/druidio" target="_blank"><span class="fab fa-twitter"></span></a> · <a title="Download via Apache" href="https://www.apache.org/dyn/closer.cgi?path=/incubator/druid/{{ site.druid_versions[0].versions[0].version }}/apache-druid-{{ site.druid_versions[0].versions[0].version }}-bin.tar.gz" target="_blank"><span class="fas fa-feather"></span></a> · <a title="GitHub" href="https://github.com/apache/druid" target="_blank"><span class="fab fa-github"></span></a></div><div class="text-center license">Copyright © 2019 <a href="https://www.apache.org/" target="_blank">Apache Software Foundation</a>.<br/>Except where otherwise noted, licensed under <a rel="license" href="http://creativecommons.org/licenses/by-sa/4.0/">CC BY-SA 4.0</a>.<br/>Apache Druid, Druid, and the Druid logo are either registered trademarks or trademarks of The Apache Software Foundation in the United States and other countries.</div></div></footer></div><script type="text/javascript" src="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.js"></script><script>
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+<h3><a class="anchor" aria-hidden="true" id="configuration"></a><a href="#configuration" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Configuration</h3>
+<p>For Apache Druid Overlord Process Configuration, see <a href="../configuration/index.html#overlord">Overlord Configuration</a>.</p>
+<h3><a class="anchor" aria-hidden="true" id="http-endpoints"></a><a href="#http-endpoints" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>HTTP endpoints</h3>
+<p>For a list of API endpoints supported by the Overlord, please see the <a href="../operations/api-reference.html#overlord">API reference</a>.</p>
+<h3><a class="anchor" aria-hidden="true" id="overview"></a><a href="#overview" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Overview</h3>
+<p>The Overlord process is responsible for accepting tasks, coordinating task distribution, creating locks around tasks, and returning statuses to callers. Overlord can be configured to run in one of two modes - local or remote (local being default).
+In local mode Overlord is also responsible for creating Peons for executing tasks. When running the Overlord in local mode, all MiddleManager and Peon configurations must be provided as well.
+Local mode is typically used for simple workflows.  In remote mode, the Overlord and MiddleManager are run in separate processes and you can run each on a different server.
+This mode is recommended if you intend to use the indexing service as the single endpoint for all Druid indexing.</p>
+<h3><a class="anchor" aria-hidden="true" id="overlord-console"></a><a href="#overlord-console" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Overlord console</h3>
+<p>The Overlord provides a UI for managing tasks and workers. For more details, please see <a href="../operations/management-uis.html#overlord-console">overlord console</a>.</p>
+<h3><a class="anchor" aria-hidden="true" id="blacklisted-workers"></a><a href="#blacklisted-workers" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Blacklisted workers</h3>
+<p>If a MiddleManager has task failures above a threshold, the Overlord will blacklist these MiddleManagers. No more than 20% of the MiddleManagers can be blacklisted. Blacklisted MiddleManagers will be periodically whitelisted.</p>
+<p>The following variables can be used to set the threshold and blacklist timeouts.</p>
+<pre><code class="hljs"><span class="hljs-selector-tag">druid</span><span class="hljs-selector-class">.indexer</span><span class="hljs-selector-class">.runner</span><span class="hljs-selector-class">.maxRetriesBeforeBlacklist</span>
+<span class="hljs-selector-tag">druid</span><span class="hljs-selector-class">.indexer</span><span class="hljs-selector-class">.runner</span><span class="hljs-selector-class">.workerBlackListBackoffTime</span>
+<span class="hljs-selector-tag">druid</span><span class="hljs-selector-class">.indexer</span><span class="hljs-selector-class">.runner</span><span class="hljs-selector-class">.workerBlackListCleanupPeriod</span>
+<span class="hljs-selector-tag">druid</span><span class="hljs-selector-class">.indexer</span><span class="hljs-selector-class">.runner</span><span class="hljs-selector-class">.maxPercentageBlacklistWorkers</span>
+</code></pre>
+<h3><a class="anchor" aria-hidden="true" id="autoscaling"></a><a href="#autoscaling" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Autoscaling</h3>
+<p>The Autoscaling mechanisms currently in place are tightly coupled with our deployment infrastructure but the framework should be in place for other implementations. We are highly open to new implementations or extensions of the existing mechanisms. In our own deployments, MiddleManager processes are Amazon AWS EC2 nodes and they are provisioned to register themselves in a <a href="https://github.com/ning/galaxy">galaxy</a> environment.</p>
+<p>If autoscaling is enabled, new MiddleManagers may be added when a task has been in pending state for too long. MiddleManagers may be terminated if they have not run any tasks for a period of time.</p>
+</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/0.20.0/design/middlemanager.html"><span class="arrow-prev">← </span><span class="function-name-prevnext">MiddleManager Process</span></a><a class="docs-next button" href="/docs/0.20.0/design/router.html"><span>Router Process</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"></nav></div><footer class="nav-footer druid-footer" id="footer"><div class="container"><div class="text-center"><p><a href="/technology">Technology</a> · <a href="/use-cases">Use Cases</a> · <a href="/druid-powered">Powered by Druid</a> · <a href="/docs/0.20.0/latest">Docs</a> · <a href="/community/">Community</a> · <a href="/downloads.html">Download</a> · <a href="/faq">FAQ</a></p></div><div class="text-center"><a title="Join the user group" href="https://groups.google.com/forum/#!forum/druid-user" target="_blank"><span class="fa fa-comments"></span></a> · <a title="Follow Druid" href="https://twitter.com/druidio" target="_blank"><span class="fab fa-twitter"></span></a> · <a title="Download via Apache" href="https://www.apache.org/dyn/closer.cgi?path=/incubator/druid/{{ site.druid_versions[0].versions[0].version }}/apache-druid-{{ site.druid_versions[0].versions[0].version }}-bin.tar.gz" target="_blank"><span class="fas fa-feather"></span></a> · <a title="GitHub" href="https://github.com/apache/druid" target="_blank"><span class="fab fa-github"></span></a></div><div class="text-center license">Copyright © 2019 <a href="https://www.apache.org/" target="_blank">Apache Software Foundation</a>.<br/>Except where otherwise noted, licensed under <a rel="license" href="http://creativecommons.org/licenses/by-sa/4.0/">CC BY-SA 4.0</a>.<br/>Apache Druid, Druid, and the Druid logo are either registered trademarks or trademarks of The Apache Software Foundation in the United States and other countries.</div></div></footer></div><script type="text/javascript" src="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.js"></script><script>
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+<h3><a class="anchor" aria-hidden="true" id="configuration"></a><a href="#configuration" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Configuration</h3>
+<p>For Apache Druid Peon Configuration, see <a href="../configuration/index.html#peon-query-configuration">Peon Query Configuration</a> and <a href="../configuration/index.html#additional-peon-configuration">Additional Peon Configuration</a>.</p>
+<h3><a class="anchor" aria-hidden="true" id="http-endpoints"></a><a href="#http-endpoints" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>HTTP endpoints</h3>
+<p>For a list of API endpoints supported by the Peon, please see the <a href="../operations/api-reference.html#peon">Peon API reference</a>.</p>
+<p>Peons run a single task in a single JVM. MiddleManager is responsible for creating Peons for running tasks.
+Peons should rarely (if ever for testing purposes) be run on their own.</p>
+<h3><a class="anchor" aria-hidden="true" id="running"></a><a href="#running" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Running</h3>
+<p>The Peon should very rarely ever be run independent of the MiddleManager unless for development purposes.</p>
+<pre><code class="hljs"><span class="hljs-selector-tag">org</span><span class="hljs-selector-class">.apache</span><span class="hljs-selector-class">.druid</span><span class="hljs-selector-class">.cli</span><span class="hljs-selector-class">.Main</span> <span class="hljs-selector-tag">internal</span> <span class="hljs-selector-tag">peon</span> &lt;<span class="hljs-selector-tag">task_file</span>&gt; &lt;<span class="hljs-selector-tag">status_file</span>&gt;
+</code></pre>
+<p>The task file contains the task JSON object.
+The status file indicates where the task status will be output.</p>
+</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/0.20.0/design/router.html"><span class="arrow-prev">← </span><span>Router Process</span></a><a class="docs-next button" href="/docs/0.20.0/development/extensions-core/approximate-histograms.html"><span>Approximate Histogram aggregators</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"></nav></div><footer class="nav-footer druid-footer" id="footer"><div class="container"><div class="text-center"><p><a href="/technology">Technology</a> · <a href="/use-cases">Use Cases</a> · <a href="/druid-powered">Powered by Druid</a> · <a href="/docs/0.20.0/latest">Docs</a> · <a href="/community/">Community</a> · <a href="/downloads.html">Download</a> · <a href="/faq">FAQ</a></p></div><div class="text-center"><a title="Join the user group" href="https://groups.google.com/forum/#!forum/druid-user" target="_blank"><span class="fa fa-comments"></span></a> · <a title="Follow Druid" href="https://twitter.com/druidio" target="_blank"><span class="fab fa-twitter"></span></a> · <a title="Download via Apache" href="https://www.apache.org/dyn/closer.cgi?path=/incubator/druid/{{ site.druid_versions[0].versions[0].version }}/apache-druid-{{ site.druid_versions[0].versions[0].version }}-bin.tar.gz" target="_blank"><span class="fas fa-feather"></span></a> · <a title="GitHub" href="https://github.com/apache/druid" target="_blank"><span class="fab fa-github"></span></a></div><div class="text-center license">Copyright © 2019 <a href="https://www.apache.org/" target="_blank">Apache Software Foundation</a>.<br/>Except where otherwise noted, licensed under <a rel="license" href="http://creativecommons.org/licenses/by-sa/4.0/">CC BY-SA 4.0</a>.<br/>Apache Druid, Druid, and the Druid logo are either registered trademarks or trademarks of The Apache Software Foundation in the United States and other countries.</div></div></footer></div><script type="text/javascript" src="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.js"></script><script>
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+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>Redirecting...</title>
+<link rel="canonical" href="../ingestion/standalone-realtime.html">
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diff --git a/docs/0.20.0/design/processes.html b/docs/0.20.0/design/processes.html
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+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Processes and servers · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/0.20.0/design/processes.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.20.0" /><meta property="og:title" content="Processes and servers · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
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+<h2><a class="anchor" aria-hidden="true" id="process-types"></a><a href="#process-types" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Process types</h2>
+<p>Druid has several process types:</p>
+<ul>
+<li><a href="/docs/0.20.0/design/coordinator.html">Coordinator</a></li>
+<li><a href="/docs/0.20.0/design/overlord.html">Overlord</a></li>
+<li><a href="/docs/0.20.0/design/broker.html">Broker</a></li>
+<li><a href="/docs/0.20.0/design/historical.html">Historical</a></li>
+<li><a href="/docs/0.20.0/design/middlemanager.html">MiddleManager</a> and <a href="/docs/0.20.0/design/peons.html">Peons</a></li>
+<li><a href="/docs/0.20.0/design/indexer.html">Indexer (Optional)</a></li>
+<li><a href="/docs/0.20.0/design/router.html">Router (Optional)</a></li>
+</ul>
+<h2><a class="anchor" aria-hidden="true" id="server-types"></a><a href="#server-types" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Server types</h2>
+<p>Druid processes can be deployed any way you like, but for ease of deployment we suggest organizing them into three server types:</p>
+<ul>
+<li><strong>Master</strong></li>
+<li><strong>Query</strong></li>
+<li><strong>Data</strong></li>
+</ul>
+<p><img src="../assets/druid-architecture.png" width="800"/></p>
+<p>This section describes the Druid processes and the suggested Master/Query/Data server organization, as shown in the architecture diagram above.</p>
+<h3><a class="anchor" aria-hidden="true" id="master-server"></a><a href="#master-server" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Master server</h3>
+<p>A Master server manages data ingestion and availability: it is responsible for starting new ingestion jobs and coordinating availability of data on the &quot;Data servers&quot; described below.</p>
+<p>Within a Master server, functionality is split between two processes, the Coordinator and Overlord.</p>
+<h4><a class="anchor" aria-hidden="true" id="coordinator-process"></a><a href="#coordinator-process" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Coordinator process</h4>
+<p><a href="/docs/0.20.0/design/coordinator.html"><strong>Coordinator</strong></a> processes watch over the Historical processes on the Data servers. They are responsible for assigning segments to specific servers, and for ensuring segments are well-balanced across Historicals.</p>
+<h4><a class="anchor" aria-hidden="true" id="overlord-process"></a><a href="#overlord-process" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Overlord process</h4>
+<p><a href="/docs/0.20.0/design/overlord.html"><strong>Overlord</strong></a> processes watch over the MiddleManager processes on the Data servers and are the controllers of data ingestion into Druid. They are responsible for assigning ingestion tasks to MiddleManagers and for coordinating segment publishing.</p>
+<h3><a class="anchor" aria-hidden="true" id="query-server"></a><a href="#query-server" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Query server</h3>
+<p>A Query server provides the endpoints that users and client applications interact with, routing queries to Data servers or other Query servers (and optionally proxied Master server requests as well).</p>
+<p>Within a Query server, functionality is split between two processes, the Broker and Router.</p>
+<h4><a class="anchor" aria-hidden="true" id="broker-process"></a><a href="#broker-process" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Broker process</h4>
+<p><a href="/docs/0.20.0/design/broker.html"><strong>Broker</strong></a> processes receive queries from external clients and forward those queries to Data servers. When Brokers receive results from those subqueries, they merge those results and return them to the
+caller. End users typically query Brokers rather than querying Historicals or MiddleManagers processes on Data servers directly.</p>
+<h4><a class="anchor" aria-hidden="true" id="router-process-optional"></a><a href="#router-process-optional" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Router process (optional)</h4>
+<p><a href="/docs/0.20.0/design/router.html"><strong>Router</strong></a> processes are <em>optional</em> processes that provide a unified API gateway in front of Druid Brokers,
+Overlords, and Coordinators. They are optional since you can also simply contact the Druid Brokers, Overlords, and
+Coordinators directly.</p>
+<p>The Router also runs the <a href="/docs/0.20.0/operations/druid-console.html">Druid Console</a>, a management UI for datasources, segments, tasks, data processes (Historicals and MiddleManagers), and coordinator dynamic configuration. The user can also run SQL and native Druid queries within the console.</p>
+<h3><a class="anchor" aria-hidden="true" id="data-server"></a><a href="#data-server" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Data server</h3>
+<p>A Data server executes ingestion jobs and stores queryable data.</p>
+<p>Within a Data server, functionality is split between two processes, the Historical and MiddleManager.</p>
+<h3><a class="anchor" aria-hidden="true" id="historical-process"></a><a href="#historical-process" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Historical process</h3>
+<p><a href="/docs/0.20.0/design/historical.html"><strong>Historical</strong></a> processes are the workhorses that handle storage and querying on &quot;historical&quot; data
+(including any streaming data that has been in the system long enough to be committed). Historical processes
+download segments from deep storage and respond to queries about these segments. They don't accept writes.</p>
+<h3><a class="anchor" aria-hidden="true" id="middle-manager-process"></a><a href="#middle-manager-process" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Middle Manager process</h3>
+<p><a href="/docs/0.20.0/design/middlemanager.html"><strong>MiddleManager</strong></a> processes handle ingestion of new data into the cluster. They are responsible
+for reading from external data sources and publishing new Druid segments.</p>
+<h4><a class="anchor" aria-hidden="true" id="peon-processes"></a><a href="#peon-processes" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Peon processes</h4>
+<p><a href="/docs/0.20.0/design/peons.html"><strong>Peon</strong></a> processes are task execution engines spawned by MiddleManagers. Each Peon runs a separate JVM and is responsible for executing a single task. Peons always run on the same host as the MiddleManager that spawned them.</p>
+<h3><a class="anchor" aria-hidden="true" id="indexer-process-optional"></a><a href="#indexer-process-optional" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Indexer process (optional)</h3>
+<p><a href="/docs/0.20.0/design/indexer.html"><strong>Indexer</strong></a> processes are an alternative to MiddleManagers and Peons. Instead of
+forking separate JVM processes per-task, the Indexer runs tasks as individual threads within a single JVM process.</p>
+<p>The Indexer is designed to be easier to configure and deploy compared to the MiddleManager + Peon system and to
+better enable resource sharing across tasks. The Indexer is a newer feature and is currently designated
+<a href="/docs/0.20.0/development/experimental.html">experimental</a> due to the fact that its memory management system is still under
+development. It will continue to mature in future versions of Druid.</p>
+<p>Typically, you would deploy either MiddleManagers or Indexers, but not both.</p>
+<h2><a class="anchor" aria-hidden="true" id="pros-and-cons-of-colocation"></a><a href="#pros-and-cons-of-colocation" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Pros and cons of colocation</h2>
+<p>Druid processes can be colocated based on the Master/Data/Query server organization as
+described above. This organization generally results in better utilization of
+hardware resources for most clusters.</p>
+<p>For very large scale clusters, however, it can be desirable to split the Druid processes
+such that they run on individual servers to avoid resource contention.</p>
+<p>This section describes guidelines and configuration parameters related to process colocation.</p>
+<h3><a class="anchor" aria-hidden="true" id="coordinators-and-overlords"></a><a href="#coordinators-and-overlords" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Coordinators and Overlords</h3>
+<p>The workload on the Coordinator process tends to increase with the number of segments in the cluster. The Overlord's workload also increases based on the number of segments in the cluster, but to a lesser degree than the Coordinator.</p>
+<p>In clusters with very high segment counts, it can make sense to separate the Coordinator and Overlord processes to provide more resources for the Coordinator's segment balancing workload.</p>
+<h4><a class="anchor" aria-hidden="true" id="unified-process"></a><a href="#unified-process" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Unified Process</h4>
+<p>The Coordinator and Overlord processes can be run as a single combined process by setting the <code>druid.coordinator.asOverlord.enabled</code> property.</p>
+<p>Please see <a href="../configuration/index.html#coordinator-operation">Coordinator Configuration: Operation</a> for details.</p>
+<h3><a class="anchor" aria-hidden="true" id="historicals-and-middlemanagers"></a><a href="#historicals-and-middlemanagers" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Historicals and MiddleManagers</h3>
+<p>With higher levels of ingestion or query load, it can make sense to deploy the Historical and MiddleManager processes on separate hosts to to avoid CPU and memory contention.</p>
+<p>The Historical also benefits from having free memory for memory mapped segments, which can be another reason to deploy the Historical and MiddleManager processes separately.</p>
+</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/0.20.0/design/segments.html"><span class="arrow-prev">← </span><span>Segments</span></a><a class="docs-next button" href="/docs/0.20.0/dependencies/deep-storage.html"><span>Deep storage</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#process-types">Process types</a></li><li><a href="#server-types">Server types</a><ul class="toc-headings"><li><a href="#master-server">Master server</a></li><li><a href="#query-server">Query server</a></li><li><a href="#data-server">Data server</a></li><li><a href="#historical-process">Historical process</a></li><li><a href="#middle-manager-process">Middle Manager process</a></li><li><a href="#indexer-process-optional">Indexer process (optional)</a></li></ul></li><li><a href="#pros-and-cons-of-colocation">Pros and cons of colocation</a><ul class="toc-headings"><li><a href="#coordinators-and-overlords">Coordinators and Overlords</a></li><li><a href="#historicals-and-middlemanagers">Historicals and MiddleManagers</a></li></ul></li></ul></nav></div><footer class="nav-footer druid-footer" id="footer"><div class="container"><div class="text-center"><p><a href="/technology">Technology</a> · <a href="/use-cases">Use Cases</a> · <a href="/druid-powered">Powered by Druid</a> · <a href="/docs/0.20.0/latest">Docs</a> · <a href="/community/">Community</a> · <a href="/downloads.html">Download</a> · <a href="/faq">FAQ</a></p></div><div class="text-center"><a title="Join the user group" href="https://groups.google.com/forum/#!forum/druid-user" target="_blank"><span class="fa fa-comments"></span></a> · <a title="Follow Druid" href="https://twitter.com/druidio" target="_blank"><span class="fab fa-twitter"></span></a> · <a title="Download via Apache" href="https://www.apache.org/dyn/closer.cgi?path=/incubator/druid/{{ site.druid_versions[0].versions[0].version }}/apache-druid-{{ site.druid_versions[0].versions[0].version }}-bin.tar.gz" target="_blank"><span class="fas fa-feather"></span></a> · <a title="GitHub" href="https://github.com/apache/druid" target="_blank"><span class="fab fa-github"></span></a></div><div class="text-center license">Copyright © 2019 <a href="https://www.apache.org/" target="_blank">Apache Software Foundation</a>.<br/>Except where otherwise noted, licensed under <a rel="license" href="http://creativecommons.org/licenses/by-sa/4.0/">CC BY-SA 4.0</a>.<br/>Apache Druid, Druid, and the Druid logo are either registered trademarks or trademarks of The Apache Software Foundation in the United States and other countries.</div></div></footer></div><script type="text/javascript" src="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.js"></script><script>
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+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
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+  ~ regarding copyright ownership.  The ASF licenses this file
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+  ~ KIND, either express or implied.  See the License for the
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+  -->
+<blockquote>
+<p>The Router is an optional and <a href="/docs/0.20.0/development/experimental.html">experimental</a> feature due to the fact that its recommended place in the Druid cluster architecture is still evolving.
+However, it has been battle-tested in production, and it hosts the powerful <a href="/docs/0.20.0/operations/druid-console.html">Druid Console</a>, so you should feel safe deploying it.</p>
+</blockquote>
+<p>The Apache Druid Router process can be used to route queries to different Broker processes. By default, the broker routes queries based on how <a href="/docs/0.20.0/operations/rule-configuration.html">Rules</a> are set up. For example, if 1 month of recent data is loaded into a <code>hot</code> cluster, queries that fall within the recent month can be routed to a dedicated set of brokers. Queries outside this range are routed to another set of brokers. This set up provides query isolation such that queries for more important data are not impacted by queries for less important data.</p>
+<p>For query routing purposes, you should only ever need the Router process if you have a Druid cluster well into the terabyte range.</p>
+<p>In addition to query routing, the Router also runs the <a href="/docs/0.20.0/operations/druid-console.html">Druid Console</a>, a management UI for datasources, segments, tasks, data processes (Historicals and MiddleManagers), and coordinator dynamic configuration. The user can also run SQL and native Druid queries within the console.</p>
+<h3><a class="anchor" aria-hidden="true" id="configuration"></a><a href="#configuration" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Configuration</h3>
+<p>For Apache Druid Router Process Configuration, see <a href="../configuration/index.html#router">Router Configuration</a>.</p>
+<h3><a class="anchor" aria-hidden="true" id="http-endpoints"></a><a href="#http-endpoints" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>HTTP endpoints</h3>
+<p>For a list of API endpoints supported by the Router, see <a href="../operations/api-reference.html#router">Router API</a>.</p>
+<h3><a class="anchor" aria-hidden="true" id="running"></a><a href="#running" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Running</h3>
+<pre><code class="hljs">org.apache.druid.cli.Main<span class="hljs-built_in"> server </span>router
+</code></pre>
+<h3><a class="anchor" aria-hidden="true" id="router-as-management-proxy"></a><a href="#router-as-management-proxy" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Router as management proxy</h3>
+<p>The Router can be configured to forward requests to the active Coordinator or Overlord process. This may be useful for
+setting up a highly available cluster in situations where the HTTP redirect mechanism of the inactive -&gt; active
+Coordinator/Overlord does not function correctly (servers are behind a load balancer, the hostname used in the redirect
+is only resolvable internally, etc.).</p>
+<h4><a class="anchor" aria-hidden="true" id="enabling-the-management-proxy"></a><a href="#enabling-the-management-proxy" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Enabling the management proxy</h4>
+<p>To enable this functionality, set the following in the Router's runtime.properties:</p>
+<pre><code class="hljs"><span class="hljs-attr">druid.router.managementProxy.enabled</span>=<span class="hljs-literal">true</span>
+</code></pre>
+<h4><a class="anchor" aria-hidden="true" id="management-proxy-routing"></a><a href="#management-proxy-routing" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Management proxy routing</h4>
+<p>The management proxy supports implicit and explicit routes. Implicit routes are those where the destination can be
+determined from the original request path based on Druid API path conventions. For the Coordinator the convention is
+<code>/druid/coordinator/*</code> and for the Overlord the convention is <code>/druid/indexer/*</code>. These are convenient because they mean
+that using the management proxy does not require modifying the API request other than issuing the request to the Router
+instead of the Coordinator or Overlord. Most Druid API requests can be routed implicitly.</p>
+<p>Explicit routes are those where the request to the Router contains a path prefix indicating which process the request
+should be routed to. For the Coordinator this prefix is <code>/proxy/coordinator</code> and for the Overlord it is <code>/proxy/overlord</code>.
+This is required for API calls with an ambiguous destination. For example, the <code>/status</code> API is present on all Druid
+processes, so explicit routing needs to be used to indicate the proxy destination.</p>
+<p>This is summarized in the table below:</p>
+<table>
+<thead>
+<tr><th>Request Route</th><th>Destination</th><th>Rewritten Route</th><th>Example</th></tr>
+</thead>
+<tbody>
+<tr><td><code>/druid/coordinator/*</code></td><td>Coordinator</td><td><code>/druid/coordinator/*</code></td><td><code>router:8888/druid/coordinator/v1/datasources</code> -&gt; <code>coordinator:8081/druid/coordinator/v1/datasources</code></td></tr>
+<tr><td><code>/druid/indexer/*</code></td><td>Overlord</td><td><code>/druid/indexer/*</code></td><td><code>router:8888/druid/indexer/v1/task</code> -&gt; <code>overlord:8090/druid/indexer/v1/task</code></td></tr>
+<tr><td><code>/proxy/coordinator/*</code></td><td>Coordinator</td><td><code>/*</code></td><td><code>router:8888/proxy/coordinator/status</code> -&gt; <code>coordinator:8081/status</code></td></tr>
+<tr><td><code>/proxy/overlord/*</code></td><td>Overlord</td><td><code>/*</code></td><td><code>router:8888/proxy/overlord/druid/indexer/v1/isLeader</code> -&gt; <code>overlord:8090/druid/indexer/v1/isLeader</code></td></tr>
+</tbody>
+</table>
+<h3><a class="anchor" aria-hidden="true" id="router-strategies"></a><a href="#router-strategies" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Router strategies</h3>
+<p>The Router has a configurable list of strategies for how it selects which Brokers to route queries to. The order of the strategies matter because as soon as a strategy condition is matched, a Broker is selected.</p>
+<h4><a class="anchor" aria-hidden="true" id="timeboundary"></a><a href="#timeboundary" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>timeBoundary</h4>
+<pre><code class="hljs css language-json">{
+  <span class="hljs-attr">"type"</span>:<span class="hljs-string">"timeBoundary"</span>
+}
+</code></pre>
+<p>Including this strategy means all timeBoundary queries are always routed to the highest priority Broker.</p>
+<h4><a class="anchor" aria-hidden="true" id="priority"></a><a href="#priority" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>priority</h4>
+<pre><code class="hljs css language-json">{
+  <span class="hljs-attr">"type"</span>:<span class="hljs-string">"priority"</span>,
+  <span class="hljs-attr">"minPriority"</span>:<span class="hljs-number">0</span>,
+  <span class="hljs-attr">"maxPriority"</span>:<span class="hljs-number">1</span>
+}
+</code></pre>
+<p>Queries with a priority set to less than minPriority are routed to the lowest priority Broker. Queries with priority set to greater than maxPriority are routed to the highest priority Broker. By default, minPriority is 0 and maxPriority is 1. Using these default values, if a query with priority 0 (the default query priority is 0) is sent, the query skips the priority selection logic.</p>
+<h4><a class="anchor" aria-hidden="true" id="javascript"></a><a href="#javascript" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>JavaScript</h4>
+<p>Allows defining arbitrary routing rules using a JavaScript function. The function is passed the configuration and the query to be executed, and returns the tier it should be routed to, or null for the default tier.</p>
+<p><em>Example</em>: a function that sends queries containing more than three aggregators to the lowest priority Broker.</p>
+<pre><code class="hljs css language-json">{
+  <span class="hljs-attr">"type"</span> : <span class="hljs-string">"javascript"</span>,
+  <span class="hljs-attr">"function"</span> : <span class="hljs-string">"function (config, query) { if (query.getAggregatorSpecs &amp;&amp; query.getAggregatorSpecs().size() &gt;= 3) { var size = config.getTierToBrokerMap().values().size(); if (size &gt; 0) { return config.getTierToBrokerMap().values().toArray()[size-1] } else { return config.getDefaultBrokerServiceName() } } else { return null } }"</span>
+}
+</code></pre>
+<blockquote>
+<p>JavaScript-based functionality is disabled by default. Please refer to the Druid <a href="/docs/0.20.0/development/javascript.html">JavaScript programming guide</a> for guidelines about using Druid's JavaScript functionality, including instructions on how to enable it.</p>
+</blockquote>
+<h3><a class="anchor" aria-hidden="true" id="avatica-query-balancing"></a><a href="#avatica-query-balancing" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Avatica query balancing</h3>
+<p>All Avatica JDBC requests with a given connection ID must be routed to the same Broker, since Druid Brokers do not share connection state with each other.</p>
+<p>To accomplish this, Druid provides two built-in balancers that use rendezvous hashing and consistent hashing of a request's connection ID respectively to assign requests to Brokers.</p>
+<p>Note that when multiple Routers are used, all Routers should have identical balancer configuration to ensure that they make the same routing decisions.</p>
+<h4><a class="anchor" aria-hidden="true" id="rendezvous-hash-balancer"></a><a href="#rendezvous-hash-balancer" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Rendezvous hash balancer</h4>
+<p>This balancer uses <a href="https://en.wikipedia.org/wiki/Rendezvous_hashing">Rendezvous Hashing</a> on an Avatica request's connection ID to assign the request to a Broker.</p>
+<p>To use this balancer, specify the following property:</p>
+<pre><code class="hljs">druid<span class="hljs-selector-class">.router</span><span class="hljs-selector-class">.avatica</span><span class="hljs-selector-class">.balancer</span>.type=rendezvousHash
+</code></pre>
+<p>If no <code>druid.router.avatica.balancer</code> property is set, the Router will also default to using the Rendezvous Hash Balancer.</p>
+<h4><a class="anchor" aria-hidden="true" id="consistent-hash-balancer"></a><a href="#consistent-hash-balancer" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Consistent hash balancer</h4>
+<p>This balancer uses <a href="https://en.wikipedia.org/wiki/Consistent_hashing">Consistent Hashing</a> on an Avatica request's connection ID to assign the request to a Broker.</p>
+<p>To use this balancer, specify the following property:</p>
+<pre><code class="hljs">druid<span class="hljs-selector-class">.router</span><span class="hljs-selector-class">.avatica</span><span class="hljs-selector-class">.balancer</span>.type=consistentHash
+</code></pre>
+<p>This is a non-default implementation that is provided for experimentation purposes. The consistent hasher has longer setup times on initialization and when the set of Brokers changes, but has a faster Broker assignment time than the rendezvous hasher when tested with 5 Brokers. Benchmarks for both implementations have been provided in <code>ConsistentHasherBenchmark</code> and <code>RendezvousHasherBenchmark</code>. The consistent hasher also requires locking, while the rendezvous hasher does not.</p>
+<h3><a class="anchor" aria-hidden="true" id="example-production-configuration"></a><a href="#example-production-configuration" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Example production configuration</h3>
+<p>In this example, we have two tiers in our production cluster: <code>hot</code> and <code>_default_tier</code>. Queries for the <code>hot</code> tier are routed through the <code>broker-hot</code> set of Brokers, and queries for the <code>_default_tier</code> are routed through the <code>broker-cold</code> set of Brokers. If any exceptions or network problems occur, queries are routed to the <code>broker-cold</code> set of brokers. In our example, we are running with a c3.2xlarge EC2 instance. We assume a <code>common.runtime.properties</code> already exists.</p>
+<p>JVM settings:</p>
+<pre><code class="hljs">-<span class="ruby">server
+</span>-<span class="ruby">Xmx13g
+</span>-<span class="ruby">Xms13g
+</span>-<span class="ruby"><span class="hljs-symbol">XX:</span>NewSize=<span class="hljs-number">256</span>m
+</span>-<span class="ruby"><span class="hljs-symbol">XX:</span>MaxNewSize=<span class="hljs-number">256</span>m
+</span>-<span class="ruby"><span class="hljs-symbol">XX:</span>+UseConcMarkSweepGC
+</span>-<span class="ruby"><span class="hljs-symbol">XX:</span>+PrintGCDetails
+</span>-<span class="ruby"><span class="hljs-symbol">XX:</span>+PrintGCTimeStamps
+</span>-<span class="ruby"><span class="hljs-symbol">XX:</span>+UseLargePages
+</span>-<span class="ruby"><span class="hljs-symbol">XX:</span>+HeapDumpOnOutOfMemoryError
+</span>-<span class="ruby"><span class="hljs-symbol">XX:</span>HeapDumpPath=<span class="hljs-regexp">/mnt/galaxy</span><span class="hljs-regexp">/deploy/current</span><span class="hljs-regexp">/
+</span></span>-<span class="ruby"><span class="hljs-regexp">Duser.timezone=UTC
+</span></span>-<span class="ruby"><span class="hljs-regexp">Dfile.encoding=UTF-8
+</span></span>-<span class="ruby"><span class="hljs-regexp">Djava.io.tmpdir=/mnt</span><span class="hljs-regexp">/tmp
+</span></span>
+-<span class="ruby"><span class="hljs-regexp">Dcom.sun.management.jmxremote.port=17071
+</span></span>-<span class="ruby"><span class="hljs-regexp">Dcom.sun.management.jmxremote.authenticate=false
+</span></span>-<span class="ruby"><span class="hljs-regexp">Dcom.sun.management.jmxremote.ssl=false
+</span></span></code></pre>
+<p>Runtime.properties:</p>
+<pre><code class="hljs"><span class="hljs-attr">druid.host</span>=<span class="hljs-comment">#{IP_ADDR}:8080</span>
+<span class="hljs-attr">druid.plaintextPort</span>=<span class="hljs-number">8080</span>
+<span class="hljs-attr">druid.service</span>=druid/router
+
+<span class="hljs-attr">druid.router.defaultBrokerServiceName</span>=druid:broker-cold
+<span class="hljs-attr">druid.router.coordinatorServiceName</span>=druid:coordinator
+<span class="hljs-attr">druid.router.tierToBrokerMap</span>={<span class="hljs-string">"hot"</span>:<span class="hljs-string">"druid:broker-hot"</span>,<span class="hljs-string">"_default_tier"</span>:<span class="hljs-string">"druid:broker-cold"</span>}
+<span class="hljs-attr">druid.router.http.numConnections</span>=<span class="hljs-number">50</span>
+<span class="hljs-attr">druid.router.http.readTimeout</span>=PT5M
+
+<span class="hljs-comment"># Number of threads used by the Router proxy http client</span>
+<span class="hljs-attr">druid.router.http.numMaxThreads</span>=<span class="hljs-number">100</span>
+
+<span class="hljs-attr">druid.server.http.numThreads</span>=<span class="hljs-number">100</span>
+</code></pre>
+</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/0.20.0/design/overlord.html"><span class="arrow-prev">← </span><span>Overlord Process</span></a><a class="docs-next button" href="/docs/0.20.0/design/peons.html"><span>Peons</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"></nav></div><footer class="nav-footer druid-footer" id="footer"><div class="container"><div class="text-center"><p><a href="/technology">Technology</a> · <a href="/use-cases">Use Cases</a> · <a href="/druid-powered">Powered by Druid</a> · <a href="/docs/0.20.0/latest">Docs</a> · <a href="/community/">Community</a> · <a href="/downloads.html">Download</a> · <a href="/faq">FAQ</a></p></div><div class="text-center"><a title="Join the user group" href="https://groups.google.com/forum/#!forum/druid-user" target="_blank"><span class="fa fa-comments"></span></a> · <a title="Follow Druid" href="https://twitter.com/druidio" target="_blank"><span class="fab fa-twitter"></span></a> · <a title="Download via Apache" href="https://www.apache.org/dyn/closer.cgi?path=/incubator/druid/{{ site.druid_versions[0].versions[0].version }}/apache-druid-{{ site.druid_versions[0].versions[0].version }}-bin.tar.gz" target="_blank"><span class="fas fa-feather"></span></a> · <a title="GitHub" href="https://github.com/apache/druid" target="_blank"><span class="fab fa-github"></span></a></div><div class="text-center license">Copyright © 2019 <a href="https://www.apache.org/" target="_blank">Apache Software Foundation</a>.<br/>Except where otherwise noted, licensed under <a rel="license" href="http://creativecommons.org/licenses/by-sa/4.0/">CC BY-SA 4.0</a>.<br/>Apache Druid, Druid, and the Druid logo are either registered trademarks or trademarks of The Apache Software Foundation in the United States and other countries.</div></div></footer></div><script type="text/javascript" src="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.js"></script><script>
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+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Segments · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/0.20.0/design/segments.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.20.0" /><meta property="og:title" content="Segments · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
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collapsible">Tutorials<span class="arrow"><svg width="24" height="24" viewBox="0 0 24 24"><path fill="#565656" d="M7.41 15.41L12 10.83l4.59 4.58L18 14l-6-6-6 6z"></path><path d="M0 0h24v24H0z" fill="none"></path></svg></span></h3><ul class="hide"><li class="navListItem"><a class="navItem" href="/docs/0.20.0/tutorials/tutorial-batch.html">Loading files natively</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/tutorials/tutorial-kafka.html">Load from Apache Kafka</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/tutorials/tutorial-batch-hadoop.html">Load from Apache Hadoop</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/tutorials/tutorial-query.html">Querying data</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/tutorials/tutorial-rollup.html">Roll-up</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/tutorials/tutorial-retention.html">Configuring data retention</a></li><li 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+<p>Apache Druid stores its index in <em>segment files</em>, which are partitioned by
+time. In a basic setup, one segment file is created for each time
+interval, where the time interval is configurable in the
+<code>segmentGranularity</code> parameter of the
+<a href="/docs/0.20.0/ingestion/index.html#granularityspec"><code>granularitySpec</code></a>.  For Druid to
+operate well under heavy query load, it is important for the segment
+file size to be within the recommended range of 300MB-700MB. If your
+segment files are larger than this range, then consider either
+changing the granularity of the time interval or partitioning your
+data and tweaking the <code>targetPartitionSize</code> in your <code>partitionsSpec</code>
+(a good starting point for this parameter is 5 million rows).  See the
+sharding section below and the 'Partitioning specification' section of
+the <a href="/docs/0.20.0/ingestion/hadoop.html#partitionsspec">Batch ingestion</a> documentation
+for more information.</p>
+<h3><a class="anchor" aria-hidden="true" id="a-segment-files-core-data-structures"></a><a href="#a-segment-files-core-data-structures" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>A segment file's core data structures</h3>
+<p>Here we describe the internal structure of segment files, which is
+essentially <em>columnar</em>: the data for each column is laid out in
+separate data structures. By storing each column separately, Druid can
+decrease query latency by scanning only those columns actually needed
+for a query.  There are three basic column types: the timestamp
+column, dimension columns, and metric columns, as illustrated in the
+image below:</p>
+<p><img src="../assets/druid-column-types.png" alt="Druid column types" title="Druid Column Types"></p>
+<p>The timestamp and metric columns are simple: behind the scenes each of
+these is an array of integer or floating point values compressed with
+LZ4. Once a query knows which rows it needs to select, it simply
+decompresses these, pulls out the relevant rows, and applies the
+desired aggregation operator. As with all columns, if a query doesn’t
+require a column, then that column’s data is just skipped over.</p>
+<p>Dimensions columns are different because they support filter and
+group-by operations, so each dimension requires the following
+three data structures:</p>
+<ol>
+<li>A dictionary that maps values (which are always treated as strings) to integer IDs,</li>
+<li>A list of the column’s values, encoded using the dictionary in 1, and</li>
+<li>For each distinct value in the column, a bitmap that indicates which rows contain that value.</li>
+</ol>
+<p>Why these three data structures? The dictionary simply maps string
+values to integer ids so that the values in (2) and (3) can be
+represented compactly. The bitmaps in (3) -- also known as <em>inverted
+indexes</em> allow for quick filtering operations (specifically, bitmaps
+are convenient for quickly applying AND and OR operators). Finally,
+the list of values in (2) is needed for <em>group by</em> and <em>TopN</em>
+queries. In other words, queries that solely aggregate metrics based
+on filters do not need to touch the list of dimension values stored in (2).</p>
+<p>To get a concrete sense of these data structures, consider the ‘page’
+column from the example data above.  The three data structures that
+represent this dimension are illustrated in the diagram below.</p>
+<pre><code class="hljs"><span class="hljs-number">1</span>: Dictionary that encodes column values
+  {
+    <span class="hljs-string">"Justin Bieber"</span>: <span class="hljs-number">0</span>,
+    <span class="hljs-string">"Ke$ha"</span>:         <span class="hljs-number">1</span>
+  }
+
+<span class="hljs-number">2</span>: Column data
+  [<span class="hljs-number">0</span>,
+   <span class="hljs-number">0</span>,
+   <span class="hljs-number">1</span>,
+   <span class="hljs-number">1</span>]
+
+<span class="hljs-number">3</span>: Bitmaps - one <span class="hljs-keyword">for</span> each unique value of the column
+  value=<span class="hljs-string">"Justin Bieber"</span>: [<span class="hljs-number">1</span>,<span class="hljs-number">1</span>,<span class="hljs-number">0</span>,<span class="hljs-number">0</span>]
+  value=<span class="hljs-string">"Ke$ha"</span>:         [<span class="hljs-number">0</span>,<span class="hljs-number">0</span>,<span class="hljs-number">1</span>,<span class="hljs-number">1</span>]
+</code></pre>
+<p>Note that the bitmap is different from the first two data structures:
+whereas the first two grow linearly in the size of the data (in the
+worst case), the size of the bitmap section is the product of data
+size * column cardinality. Compression will help us here though
+because we know that for each row in 'column data', there will only be a
+single bitmap that has non-zero entry. This means that high cardinality
+columns will have extremely sparse, and therefore highly compressible,
+bitmaps. Druid exploits this using compression algorithms that are
+specially suited for bitmaps, such as roaring bitmap compression.</p>
+<h3><a class="anchor" aria-hidden="true" id="multi-value-columns"></a><a href="#multi-value-columns" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Multi-value columns</h3>
+<p>If a data source makes use of multi-value columns, then the data
+structures within the segment files look a bit different. Let's
+imagine that in the example above, the second row were tagged with
+both the 'Ke$ha' <em>and</em> 'Justin Bieber' topics. In this case, the three
+data structures would now look as follows:</p>
+<pre><code class="hljs"><span class="hljs-number">1</span>: Dictionary that encodes column values
+  {
+    <span class="hljs-string">"Justin Bieber"</span>: <span class="hljs-number">0</span>,
+    <span class="hljs-string">"Ke$ha"</span>:         <span class="hljs-number">1</span>
+  }
+
+<span class="hljs-number">2</span>: Column data
+  [<span class="hljs-number">0</span>,
+   [<span class="hljs-number">0</span>,<span class="hljs-number">1</span>],  &lt;--Row value of multi-value column can have <span class="hljs-built_in">array</span> of values
+   <span class="hljs-number">1</span>,
+   <span class="hljs-number">1</span>]
+
+<span class="hljs-number">3</span>: Bitmaps - one <span class="hljs-keyword">for</span> each unique value
+  value=<span class="hljs-string">"Justin Bieber"</span>: [<span class="hljs-number">1</span>,<span class="hljs-number">1</span>,<span class="hljs-number">0</span>,<span class="hljs-number">0</span>]
+  value=<span class="hljs-string">"Ke$ha"</span>:         [<span class="hljs-number">0</span>,<span class="hljs-number">1</span>,<span class="hljs-number">1</span>,<span class="hljs-number">1</span>]
+                            ^
+                            |
+                            |
+    Multi-value column has multiple non-zero entries
+</code></pre>
+<p>Note the changes to the second row in the column data and the Ke$ha
+bitmap. If a row has more than one value for a column, its entry in
+the 'column data' is an array of values. Additionally, a row with <em>n</em>
+values in 'column data' will have <em>n</em> non-zero valued entries in
+bitmaps.</p>
+<h2><a class="anchor" aria-hidden="true" id="sql-compatible-null-handling"></a><a href="#sql-compatible-null-handling" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>SQL Compatible Null Handling</h2>
+<p>By default, Druid string dimension columns use the values <code>''</code> and <code>null</code> interchangeably and numeric and metric columns can not represent <code>null</code> at all, instead coercing nulls to <code>0</code>. However, Druid also provides a SQL compatible null handling mode, which must be enabled at the system level, through <code>druid.generic.useDefaultValueForNull</code>. This setting, when set to <code>false</code>, will allow Druid to <em>at ingestion time</em> create segments whose string columns can distinguish <code>''</code> from <code>null</code>, and numeric columns which can represent <code>null</code> valued rows instead of <code>0</code>.</p>
+<p>String dimension columns contain no additional column structures in this mode, instead just reserving an additional dictionary entry for the <code>null</code> value. Numeric columns however will be stored in the segment with an additional bitmap whose set bits indicate <code>null</code> valued rows. In addition to slightly increased segment sizes, SQL compatible null handling can incur a performance cost at query time as well, due to the need to check the null bitmap. This performance cost only occurs for columns that actually contain nulls.</p>
+<h2><a class="anchor" aria-hidden="true" id="naming-convention"></a><a href="#naming-convention" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Naming Convention</h2>
+<p>Identifiers for segments are typically constructed using the segment datasource, interval start time (in ISO 8601 format), interval end time (in ISO 8601 format), and a version. If data is additionally sharded beyond a time range, the segment identifier will also contain a partition number.</p>
+<p>An example segment identifier may be:
+datasource_intervalStart_intervalEnd_version_partitionNum</p>
+<h2><a class="anchor" aria-hidden="true" id="segment-components"></a><a href="#segment-components" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Segment Components</h2>
+<p>Behind the scenes, a segment is comprised of several files, listed below.</p>
+<ul>
+<li><p><code>version.bin</code></p>
+<p>4 bytes representing the current segment version as an integer. E.g., for v9 segments, the version is 0x0, 0x0, 0x0, 0x9</p></li>
+<li><p><code>meta.smoosh</code></p>
+<p>A file with metadata (filenames and offsets) about the contents of the other <code>smoosh</code> files</p></li>
+<li><p><code>XXXXX.smoosh</code></p>
+<p>There are some number of these files, which are concatenated binary data</p>
+<p>The <code>smoosh</code> files represent multiple files &quot;smooshed&quot; together in order to minimize the number of file descriptors that must be open to house the data. They are files of up to 2GB in size (to match the limit of a memory mapped ByteBuffer in Java). The <code>smoosh</code> files house individual files for each of the columns in the data as well as an <code>index.drd</code> file with extra metadata about the segment.</p>
+<p>There is also a special column called <code>__time</code> that refers to the time column of the segment. This will hopefully become less and less special as the code evolves, but for now it’s as special as my Mommy always told me I am.</p></li>
+</ul>
+<p>In the codebase, segments have an internal format version. The current segment format version is <code>v9</code>.</p>
+<h2><a class="anchor" aria-hidden="true" id="format-of-a-column"></a><a href="#format-of-a-column" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Format of a column</h2>
+<p>Each column is stored as two parts:</p>
+<ol>
+<li>A Jackson-serialized ColumnDescriptor</li>
+<li>The rest of the binary for the column</li>
+</ol>
+<p>A ColumnDescriptor is essentially an object that allows us to use Jackson's polymorphic deserialization to add new and interesting methods of serialization with minimal impact to the code. It consists of some metadata about the column (what type is it, is it multi-value, etc.) and then a list of serialization/deserialization logic that can deserialize the rest of the binary.</p>
+<h3><a class="anchor" aria-hidden="true" id="compression"></a><a href="#compression" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Compression</h3>
+<p>Druid compresses blocks of values for string, long, float, and double columns, using <a href="https://github.com/lz4/lz4-java">LZ4</a> by default, and bitmaps for string columns and numeric null values are compressed using <a href="https://github.com/RoaringBitmap/RoaringBitmap">Roaring</a>. We recommend sticking with these defaults unless experimental verification with your own data and query patterns suggest that non-default options will perform better in your specific case. For example, for bitmap in string columns, the differences between using Roaring and CONCISE are most pronounced for high cardinality columns. In this case, Roaring is substantially faster on filters that match a lot of values, but in some cases CONCISE can have a lower footprint due to the overhead of the Roaring format (but is still slower when lots of values are matched). Currently, compression is configured on at the segment level rather than individual columns, see <a href="/docs/0.20.0/ingestion/index.html#indexspec">IndexSpec</a> for more details.</p>
+<h2><a class="anchor" aria-hidden="true" id="sharding-data-to-create-segments"></a><a href="#sharding-data-to-create-segments" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Sharding Data to Create Segments</h2>
+<h3><a class="anchor" aria-hidden="true" id="sharding"></a><a href="#sharding" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Sharding</h3>
+<p>Multiple segments may exist for the same interval of time for the same datasource. These segments form a <code>block</code> for an interval.
+Depending on the type of <code>shardSpec</code> that is used to shard the data, Druid queries may only complete if a <code>block</code> is complete. That is to say, if a block consists of 3 segments, such as:</p>
+<p><code>sampleData_2011-01-01T02:00:00:00Z_2011-01-01T03:00:00:00Z_v1_0</code></p>
+<p><code>sampleData_2011-01-01T02:00:00:00Z_2011-01-01T03:00:00:00Z_v1_1</code></p>
+<p><code>sampleData_2011-01-01T02:00:00:00Z_2011-01-01T03:00:00:00Z_v1_2</code></p>
+<p>All 3 segments must be loaded before a query for the interval <code>2011-01-01T02:00:00:00Z_2011-01-01T03:00:00:00Z</code> completes.</p>
+<p>The exception to this rule is with using linear shard specs. Linear shard specs do not force 'completeness' and queries can complete even if shards are not loaded in the system.
+For example, if your real-time ingestion creates 3 segments that were sharded with linear shard spec, and only two of the segments were loaded in the system, queries would return results only for those 2 segments.</p>
+<h2><a class="anchor" aria-hidden="true" id="schema-changes"></a><a href="#schema-changes" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Schema changes</h2>
+<h2><a class="anchor" aria-hidden="true" id="replacing-segments"></a><a href="#replacing-segments" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Replacing segments</h2>
+<p>Druid uniquely
+identifies segments using the datasource, interval, version, and partition number. The partition number is only visible in the segment id if
+there are multiple segments created for some granularity of time. For example, if you have hourly segments, but you
+have more data in an hour than a single segment can hold, you can create multiple segments for the same hour. These segments will share
+the same datasource, interval, and version, but have linearly increasing partition numbers.</p>
+<pre><code class="hljs">foo_2015<span class="hljs-number">-01</span><span class="hljs-number">-01</span>/<span class="hljs-number">2015</span><span class="hljs-number">-01</span><span class="hljs-number">-02</span>_v1_0
+foo_2015<span class="hljs-number">-01</span><span class="hljs-number">-01</span>/<span class="hljs-number">2015</span><span class="hljs-number">-01</span><span class="hljs-number">-02</span>_v1_1
+foo_2015<span class="hljs-number">-01</span><span class="hljs-number">-01</span>/<span class="hljs-number">2015</span><span class="hljs-number">-01</span><span class="hljs-number">-02</span>_v1_2
+</code></pre>
+<p>In the example segments above, the <code>dataSource = foo</code>, <code>interval = 2015-01-01/2015-01-02</code>, <code>version = v1</code>, and <code>partitionNum = 0</code>.
+If at some later point in time, you reindex the data with a new schema, the newly created segments will have a higher version id.</p>
+<pre><code class="hljs">foo_2015<span class="hljs-number">-01</span><span class="hljs-number">-01</span>/<span class="hljs-number">2015</span><span class="hljs-number">-01</span><span class="hljs-number">-02</span>_v2_0
+foo_2015<span class="hljs-number">-01</span><span class="hljs-number">-01</span>/<span class="hljs-number">2015</span><span class="hljs-number">-01</span><span class="hljs-number">-02</span>_v2_1
+foo_2015<span class="hljs-number">-01</span><span class="hljs-number">-01</span>/<span class="hljs-number">2015</span><span class="hljs-number">-01</span><span class="hljs-number">-02</span>_v2_2
+</code></pre>
+<p>Druid batch indexing (either Hadoop-based or IndexTask-based) guarantees atomic updates on an interval-by-interval basis.
+In our example, until all <code>v2</code> segments for <code>2015-01-01/2015-01-02</code> are loaded in a Druid cluster, queries exclusively use <code>v1</code> segments.
+Once all <code>v2</code> segments are loaded and queryable, all queries ignore <code>v1</code> segments and switch to the <code>v2</code> segments.
+Shortly afterwards, the <code>v1</code> segments are unloaded from the cluster.</p>
+<p>Note that updates that span multiple segment intervals are only atomic within each interval. They are not atomic across the entire update.
+For example, you have segments such as the following:</p>
+<pre><code class="hljs">foo_2015<span class="hljs-number">-01</span><span class="hljs-number">-01</span>/<span class="hljs-number">2015</span><span class="hljs-number">-01</span><span class="hljs-number">-02</span>_v1_0
+foo_2015<span class="hljs-number">-01</span><span class="hljs-number">-02</span>/<span class="hljs-number">2015</span><span class="hljs-number">-01</span><span class="hljs-number">-03</span>_v1_1
+foo_2015<span class="hljs-number">-01</span><span class="hljs-number">-03</span>/<span class="hljs-number">2015</span><span class="hljs-number">-01</span><span class="hljs-number">-04</span>_v1_2
+</code></pre>
+<p><code>v2</code> segments will be loaded into the cluster as soon as they are built and replace <code>v1</code> segments for the period of time the
+segments overlap. Before v2 segments are completely loaded, your cluster may have a mixture of <code>v1</code> and <code>v2</code> segments.</p>
+<pre><code class="hljs">foo_2015<span class="hljs-number">-01</span><span class="hljs-number">-01</span>/<span class="hljs-number">2015</span><span class="hljs-number">-01</span><span class="hljs-number">-02</span>_v1_0
+foo_2015<span class="hljs-number">-01</span><span class="hljs-number">-02</span>/<span class="hljs-number">2015</span><span class="hljs-number">-01</span><span class="hljs-number">-03</span>_v2_1
+foo_2015<span class="hljs-number">-01</span><span class="hljs-number">-03</span>/<span class="hljs-number">2015</span><span class="hljs-number">-01</span><span class="hljs-number">-04</span>_v1_2
+</code></pre>
+<p>In this case, queries may hit a mixture of <code>v1</code> and <code>v2</code> segments.</p>
+<h2><a class="anchor" aria-hidden="true" id="different-schemas-among-segments"></a><a href="#different-schemas-among-segments" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Different schemas among segments</h2>
+<p>Druid segments for the same datasource may have different schemas. If a string column (dimension) exists in one segment but not
+another, queries that involve both segments still work. Queries for the segment missing the dimension will behave as if the dimension has only null values.
+Similarly, if one segment has a numeric column (metric) but another does not, queries on the segment missing the
+metric will generally &quot;do the right thing&quot;. Aggregations over this missing metric behave as if the metric were missing.</p>
+</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/0.20.0/design/architecture.html"><span class="arrow-prev">← </span><span>Design</span></a><a class="docs-next button" href="/docs/0.20.0/design/processes.html"><span>Processes and servers</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#sql-compatible-null-handling">SQL Compatible Null Handling</a></li><li><a href="#naming-convention">Naming Convention</a></li><li><a href="#segment-components">Segment Components</a></li><li><a href="#format-of-a-column">Format of a column</a><ul class="toc-headings"><li><a href="#compression">Compression</a></li></ul></li><li><a href="#sharding-data-to-create-segments">Sharding Data to Create Segments</a><ul class="toc-headings"><li><a href="#sharding">Sharding</a></li></ul></li><li><a href="#schema-changes">Schema changes</a></li><li><a href="#replacing-segments">Replacing segments</a></li><li><a href="#different-schemas-among-segments">Different schemas among segments</a></li></ul></nav></div><footer class="nav-footer druid-footer" id="footer"><div class="container"><div class="text-center"><p><a href="/technology">Technology</a> · <a href="/use-cases">Use Cases</a> · <a href="/druid-powered">Powered by Druid</a> · <a href="/docs/0.20.0/latest">Docs</a> · <a href="/community/">Community</a> · <a href="/downloads.html">Download</a> · <a href="/faq">FAQ</a></p></div><div class="text-center"><a title="Join the user group" href="https://groups.google.com/forum/#!forum/druid-user" target="_blank"><span class="fa fa-comments"></span></a> · <a title="Follow Druid" href="https://twitter.com/druidio" target="_blank"><span class="fab fa-twitter"></span></a> · <a title="Download via Apache" href="https://www.apache.org/dyn/closer.cgi?path=/incubator/druid/{{ site.druid_versions[0].versions[0].version }}/apache-druid-{{ site.druid_versions[0].versions[0].version }}-bin.tar.gz" target="_blank"><span class="fas fa-feather"></span></a> · <a title="GitHub" href="https://github.com/apache/druid" target="_blank"><span class="fab fa-github"></span></a></div><div class="text-center license">Copyright © 2019 <a href="https://www.apache.org/" target="_blank">Apache Software Foundation</a>.<br/>Except where otherwise noted, licensed under <a rel="license" href="http://creativecommons.org/licenses/by-sa/4.0/">CC BY-SA 4.0</a>.<br/>Apache Druid, Druid, and the Druid logo are either registered trademarks or trademarks of The Apache Software Foundation in the United States and other countries.</div></div></footer></div><script type="text/javascript" src="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.js"></script><script>
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class="navListItem"><a class="navItem" href="/docs/0.20.0/development/overview.html">Developing on Druid</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/modules.html">Creating extensions</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/javascript.html">JavaScript functionality</a></li><li class="navListItem navListItemActive"><a class="navItem" href="/docs/0.20.0/development/build.html">Build from source</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/versioning.html">Versioning</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/experimental.html">Experimental features</a></li></ul></div><div class="navGroup"><h3 class="navGroupCategoryTitle collapsible">Misc<span class="arrow"><svg width="24" height="24" viewBox="0 0 24 24"><path fill="#565656" d="M7.41 15.41L12 10.83l4.59 4.58L18 14l-6-6-6 6z"></path><path d="M0 0h24v24H0z" fill="none"></path></svg></span></h3><ul class="hide"><li class="navListItem"><a class="navItem" href="/docs/0.20.0/misc/papers-and-talks.html">Papers</a></li></ul></div><div class="navGroup"><h3 class="navGroupCategoryTitle collapsible">Hidden<span class="arrow"><svg width="24" height="24" viewBox="0 0 24 24"><path fill="#565656" d="M7.41 15.41L12 10.83l4.59 4.58L18 14l-6-6-6 6z"></path><path d="M0 0h24v24H0z" fill="none"></path></svg></span></h3><ul class="hide"><li class="navListItem"><a class="navItem" href="/docs/0.20.0/comparisons/druid-vs-elasticsearch.html">Apache Druid vs Elasticsearch</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/comparisons/druid-vs-key-value.html">Apache Druid vs. Key/Value Stores (HBase/Cassandra/OpenTSDB)</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/comparisons/druid-vs-kudu.html">Apache Druid vs Kudu</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/comparisons/druid-vs-redshift.html">Apache Druid vs Redshift</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/comparisons/druid-vs-spark.html">Apache Druid vs Spark</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/comparisons/druid-vs-sql-on-hadoop.html">Apache Druid vs SQL-on-Hadoop</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/design/auth.html">Authentication and Authorization</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/design/broker.html">Broker</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/design/coordinator.html">Coordinator Process</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/design/historical.html">Historical Process</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/design/indexer.html">Indexer Process</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/design/indexing-service.html">Indexing Service</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/design/middlemanager.html">MiddleManager Process</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/design/overlord.html">Overlord Process</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/design/router.html">Router Process</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/design/peons.html">Peons</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-core/approximate-histograms.html">Approximate Histogram aggregators</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-core/avro.html">Apache Avro</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-core/azure.html">Microsoft Azure</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-core/bloom-filter.html">Bloom Filter</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-core/datasketches-extension.html">DataSketches extension</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-core/datasketches-hll.html">DataSketches HLL Sketch module</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-core/datasketches-quantiles.html">DataSketches Quantiles Sketch module</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-core/datasketches-theta.html">DataSketches Theta Sketch module</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-core/datasketches-tuple.html">DataSketches Tuple Sketch module</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-core/druid-basic-security.html">Basic Security</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-core/druid-kerberos.html">Kerberos</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-core/druid-lookups.html">Cached Lookup Module</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-core/druid-ranger-security.html">Apache Ranger Security</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-core/google.html">Google Cloud Storage</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-core/hdfs.html">HDFS</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-core/kafka-extraction-namespace.html">Apache Kafka Lookups</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-core/lookups-cached-global.html">Globally Cached Lookups</a></li><li 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href="/docs/0.20.0/development/extensions-core/simple-client-sslcontext.html">Simple SSLContext Provider Module</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-core/stats.html">Stats aggregator</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-core/test-stats.html">Test Stats Aggregators</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-contrib/ambari-metrics-emitter.html">Ambari Metrics Emitter</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-contrib/cassandra.html">Apache Cassandra</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-contrib/cloudfiles.html">Rackspace Cloud Files</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-contrib/distinctcount.html">DistinctCount Aggregator</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-contrib/graphite.html">Graphite Emitter</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-contrib/influx.html">InfluxDB Line Protocol Parser</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-contrib/influxdb-emitter.html">InfluxDB Emitter</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-contrib/kafka-emitter.html">Kafka Emitter</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-contrib/materialized-view.html">Materialized View</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-contrib/momentsketch-quantiles.html">Moment Sketches for Approximate Quantiles module</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-contrib/moving-average-query.html">Moving Average Query</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-contrib/opentsdb-emitter.html">OpenTSDB Emitter</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-contrib/redis-cache.html">Druid Redis Cache</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-contrib/sqlserver.html">Microsoft SQLServer</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-contrib/statsd.html">StatsD Emitter</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-contrib/tdigestsketch-quantiles.html">T-Digest Quantiles Sketch module</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-contrib/thrift.html">Thrift</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-contrib/time-min-max.html">Timestamp Min/Max aggregators</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-contrib/gce-extensions.html">GCE Extensions</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-contrib/aliyun-oss.html">Aliyun OSS</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/querying/hll-old.html">Cardinality/HyperUnique aggregators</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/querying/select-query.html">Select</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/ingestion/standalone-realtime.html">Realtime Process</a></li></ul></div></div></section></div><script>
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+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
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+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+  -->
+<p>You can build Apache Druid directly from source. Please note that these instructions are for building the latest stable version of Druid.
+For building the latest code in master, follow the instructions <a href="https://github.com/apache/druid/blob/master/docs/development/build.md">here</a>.</p>
+<h4><a class="anchor" aria-hidden="true" id="prerequisites"></a><a href="#prerequisites" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Prerequisites</h4>
+<h5><a class="anchor" aria-hidden="true" id="installing-java-and-maven"></a><a href="#installing-java-and-maven" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Installing Java and Maven:</h5>
+<ul>
+<li>JDK 8, 8u92+. We recommend using an OpenJDK distribution that provides long-term support and open-source licensing,
+like <a href="https://aws.amazon.com/corretto/">Amazon Corretto</a> or <a href="https://www.azul.com/downloads/zulu/">Azul Zulu</a>.</li>
+<li><a href="http://maven.apache.org/download.cgi">Maven version 3.x</a></li>
+</ul>
+<h5><a class="anchor" aria-hidden="true" id="other-dependencies"></a><a href="#other-dependencies" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Other Dependencies</h5>
+<ul>
+<li>for distribution build, Python and yaml module are required</li>
+</ul>
+<h5><a class="anchor" aria-hidden="true" id="downloading-the-source"></a><a href="#downloading-the-source" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Downloading the source:</h5>
+<pre><code class="hljs css language-bash">git <span class="hljs-built_in">clone</span> git@github.com:apache/druid.git
+<span class="hljs-built_in">cd</span> druid
+</code></pre>
+<h4><a class="anchor" aria-hidden="true" id="building-the-source"></a><a href="#building-the-source" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Building the source</h4>
+<p>The basic command to build Druid from source is:</p>
+<pre><code class="hljs css language-bash">mvn clean install
+</code></pre>
+<p>This will run static analysis, unit tests, compile classes, and package the projects into JARs. It will <em>not</em> generate the source or binary distribution tarball.</p>
+<p>In addition to the basic stages, you may also want to add the following profiles and properties:</p>
+<ul>
+<li><strong>-Pdist</strong> - Distribution profile: Generates the binary distribution tarball by pulling in core extensions and dependencies and packaging the files as <code>distribution/target/apache-druid-x.x.x-bin.tar.gz</code></li>
+<li><strong>-Papache-release</strong> - Apache release profile: Generates GPG signature and checksums, and builds the source distribution tarball as <code>distribution/target/apache-druid-x.x.x-src.tar.gz</code></li>
+<li><strong>-Prat</strong> - Apache Rat profile: Runs the Apache Rat license audit tool</li>
+<li><strong>-DskipTests</strong> - Skips unit tests (which reduces build time)</li>
+<li><strong>-Ddruid.console.skip=true</strong> - Skip front end project</li>
+</ul>
+<p>Putting these together, if you wish to build the source and binary distributions with signatures and checksums, audit licenses, and skip the unit tests, you would run:</p>
+<pre><code class="hljs css language-bash">mvn clean install -Papache-release,dist,rat -DskipTests
+</code></pre>
+</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/0.20.0/development/javascript.html"><span class="arrow-prev">← </span><span class="function-name-prevnext">JavaScript functionality</span></a><a class="docs-next button" href="/docs/0.20.0/development/versioning.html"><span>Versioning</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"></nav></div><footer class="nav-footer druid-footer" id="footer"><div class="container"><div class="text-center"><p><a href="/technology">Technology</a> · <a href="/use-cases">Use Cases</a> · <a href="/druid-powered">Powered by Druid</a> · <a href="/docs/0.20.0/latest">Docs</a> · <a href="/community/">Community</a> · <a href="/downloads.html">Download</a> · <a href="/faq">FAQ</a></p></div><div class="text-center"><a title="Join the user group" href="https://groups.google.com/forum/#!forum/druid-user" target="_blank"><span class="fa fa-comments"></span></a> · <a title="Follow Druid" href="https://twitter.com/druidio" target="_blank"><span class="fab fa-twitter"></span></a> · <a title="Download via Apache" href="https://www.apache.org/dyn/closer.cgi?path=/incubator/druid/{{ site.druid_versions[0].versions[0].version }}/apache-druid-{{ site.druid_versions[0].versions[0].version }}-bin.tar.gz" target="_blank"><span class="fas fa-feather"></span></a> · <a title="GitHub" href="https://github.com/apache/druid" target="_blank"><span class="fab fa-github"></span></a></div><div class="text-center license">Copyright © 2019 <a href="https://www.apache.org/" target="_blank">Apache Software Foundation</a>.<br/>Except where otherwise noted, licensed under <a rel="license" href="http://creativecommons.org/licenses/by-sa/4.0/">CC BY-SA 4.0</a>.<br/>Apache Druid, Druid, and the Druid logo are either registered trademarks or trademarks of The Apache Software Foundation in the United States and other countries.</div></div></footer></div><script type="text/javascript" src="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.js"></script><script>
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@@ -0,0 +1,135 @@
+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Aliyun OSS · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/0.20.0/development/extensions-contrib/aliyun-oss.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.20.0" /><meta property="og:title" content="Aliyun OSS · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
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+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
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+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
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+  -->
+<p>To use this Apache Druid extension, make sure to <a href="/docs/0.20.0/development/extensions.html#loading-extensions">include</a> <code>aliyun-oss-extensions</code> extension.</p>
+<h2><a class="anchor" aria-hidden="true" id="deep-storage"></a><a href="#deep-storage" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Deep Storage</h2>
+<p><a href="https://www.aliyun.com">Aliyun</a> is the 3rd largest cloud infrastructure provider in the world. It provides its own storage solution known as OSS, <a href="https://www.aliyun.com/product/oss">Object Storage Service</a>.</p>
+<p>To use aliyun OSS as deep storage, first config as below</p>
+<table>
+<thead>
+<tr><th>Property</th><th>Description</th><th>Possible Values</th><th>Default</th></tr>
+</thead>
+<tbody>
+<tr><td><code>druid.oss.accessKey</code></td><td>the <code>AccessKey ID</code> of your account which can be used to access the bucket</td><td></td><td>Must be set.</td></tr>
+<tr><td><code>druid.oss.secretKey</code></td><td>the <code>AccessKey Secret</code> of your account which can be used to access the bucket</td><td></td><td>Must be set.</td></tr>
+<tr><td><code>druid.oss.endpoint</code></td><td>the endpoint url of your OSS storage</td><td></td><td>Must be set.</td></tr>
+</tbody>
+</table>
+<p>if you want to use OSS as deep storage, use the configurations below</p>
+<table>
+<thead>
+<tr><th>Property</th><th>Description</th><th>Possible Values</th><th>Default</th></tr>
+</thead>
+<tbody>
+<tr><td><code>druid.storage.type</code></td><td>Global deep storage provider. Must be set to <code>oss</code> to make use of this extension.</td><td>oss</td><td>Must be set.</td></tr>
+<tr><td><code>druid.storage.oss.bucket</code></td><td>storage bucket name.</td><td></td><td>Must be set.</td></tr>
+<tr><td><code>druid.storage.oss.prefix</code></td><td>a prefix string prepended to the file names for the segments published to aliyun OSS deep storage</td><td>druid/segments</td><td></td></tr>
+</tbody>
+</table>
+<p>To save index logs to OSS, apply the configurations below:</p>
+<table>
+<thead>
+<tr><th>Property</th><th>Description</th><th>Possible Values</th><th>Default</th></tr>
+</thead>
+<tbody>
+<tr><td><code>druid.indexer.logs.type</code></td><td>Global deep storage provider. Must be set to <code>oss</code> to make use of this extension.</td><td>oss</td><td>Must be set.</td></tr>
+<tr><td><code>druid.indexer.logs.oss.bucket</code></td><td>the bucket used to keep logs</td><td></td><td>Must be set.</td></tr>
+<tr><td><code>druid.indexer.logs.oss.prefix</code></td><td>a prefix string prepended to the log files.</td><td></td><td></td></tr>
+</tbody>
+</table>
+</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/0.20.0/development/extensions-contrib/gce-extensions.html"><span class="arrow-prev">← </span><span>GCE Extensions</span></a><a class="docs-next button" href="/docs/0.20.0/querying/hll-old.html"><span class="function-name-prevnext">Cardinality/HyperUnique aggregators</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#deep-storage">Deep Storage</a></li></ul></nav></div><footer class="nav-footer druid-footer" id="footer"><div class="container"><div class="text-center"><p><a href="/technology">Technology</a> · <a href="/use-cases">Use Cases</a> · <a href="/druid-powered">Powered by Druid</a> · <a href="/docs/0.20.0/latest">Docs</a> · <a href="/community/">Community</a> · <a href="/downloads.html">Download</a> · <a href="/faq">FAQ</a></p></div><div class="text-center"><a title="Join the user group" href="https://groups.google.com/forum/#!forum/druid-user" target="_blank"><span class="fa fa-comments"></span></a> · <a title="Follow Druid" href="https://twitter.com/druidio" target="_blank"><span class="fab fa-twitter"></span></a> · <a title="Download via Apache" href="https://www.apache.org/dyn/closer.cgi?path=/incubator/druid/{{ site.druid_versions[0].versions[0].version }}/apache-druid-{{ site.druid_versions[0].versions[0].version }}-bin.tar.gz" target="_blank"><span class="fas fa-feather"></span></a> · <a title="GitHub" href="https://github.com/apache/druid" target="_blank"><span class="fab fa-github"></span></a></div><div class="text-center license">Copyright © 2019 <a href="https://www.apache.org/" target="_blank">Apache Software Foundation</a>.<br/>Except where otherwise noted, licensed under <a rel="license" href="http://creativecommons.org/licenses/by-sa/4.0/">CC BY-SA 4.0</a>.<br/>Apache Druid, Druid, and the Druid logo are either registered trademarks or trademarks of The Apache Software Foundation in the United States and other countries.</div></div></footer></div><script type="text/javascript" src="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.js"></script><script>
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+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Ambari Metrics Emitter · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/0.20.0/development/extensions-contrib/ambari-metrics-emitter.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.20.0" /><meta property="og:title" content="Ambari Metrics Emitter · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
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+  ~ Licensed to the Apache Software Foundation (ASF) under one
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+  -->
+<p>To use this Apache Druid extension, make sure to <a href="/docs/0.20.0/development/extensions.html#loading-extensions">include</a> <code>ambari-metrics-emitter</code> extension.</p>
+<h2><a class="anchor" aria-hidden="true" id="introduction"></a><a href="#introduction" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Introduction</h2>
+<p>This extension emits Druid metrics to a ambari-metrics carbon server.
+Events are sent after been <a href="http://ambari-metrics.readthedocs.org/en/latest/feeding-carbon.html#the-pickle-protocol">pickled</a>; the size of the batch is configurable.</p>
+<h2><a class="anchor" aria-hidden="true" id="configuration"></a><a href="#configuration" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Configuration</h2>
+<p>All the configuration parameters for ambari-metrics emitter are under <code>druid.emitter.ambari-metrics</code>.</p>
+<table>
+<thead>
+<tr><th>property</th><th>description</th><th>required?</th><th>default</th></tr>
+</thead>
+<tbody>
+<tr><td><code>druid.emitter.ambari-metrics.hostname</code></td><td>The hostname of the ambari-metrics server.</td><td>yes</td><td>none</td></tr>
+<tr><td><code>druid.emitter.ambari-metrics.port</code></td><td>The port of the ambari-metrics server.</td><td>yes</td><td>none</td></tr>
+<tr><td><code>druid.emitter.ambari-metrics.protocol</code></td><td>The protocol used to send metrics to ambari metrics collector. One of http/https</td><td>no</td><td>http</td></tr>
+<tr><td><code>druid.emitter.ambari-metrics.trustStorePath</code></td><td>Path to trustStore to be used for https</td><td>no</td><td>none</td></tr>
+<tr><td><code>druid.emitter.ambari-metrics.trustStoreType</code></td><td>trustStore type to be used for https</td><td>no</td><td>none</td></tr>
+<tr><td><code>druid.emitter.ambari-metrics.trustStoreType</code></td><td>trustStore password to be used for https</td><td>no</td><td>none</td></tr>
+<tr><td><code>druid.emitter.ambari-metrics.batchSize</code></td><td>Number of events to send as one batch.</td><td>no</td><td>100</td></tr>
+<tr><td><code>druid.emitter.ambari-metrics.eventConverter</code></td><td>Filter and converter of druid events to ambari-metrics timeline event(please see next section).</td><td>yes</td><td>none</td></tr>
+<tr><td><code>druid.emitter.ambari-metrics.flushPeriod</code></td><td>Queue flushing period in milliseconds.</td><td>no</td><td>1 minute</td></tr>
+<tr><td><code>druid.emitter.ambari-metrics.maxQueueSize</code></td><td>Maximum size of the queue used to buffer events.</td><td>no</td><td><code>MAX_INT</code></td></tr>
+<tr><td><code>druid.emitter.ambari-metrics.alertEmitters</code></td><td>List of emitters where alerts will be forwarded to.</td><td>no</td><td>empty list (no forwarding)</td></tr>
+<tr><td><code>druid.emitter.ambari-metrics.emitWaitTime</code></td><td>wait time in milliseconds to try to send the event otherwise emitter will throwing event.</td><td>no</td><td>0</td></tr>
+<tr><td><code>druid.emitter.ambari-metrics.waitForEventTime</code></td><td>waiting time in milliseconds if necessary for an event to become available.</td><td>no</td><td>1000 (1 sec)</td></tr>
+</tbody>
+</table>
+<h3><a class="anchor" aria-hidden="true" id="druid-to-ambari-metrics-timeline-event-converter"></a><a href="#druid-to-ambari-metrics-timeline-event-converter" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Druid to Ambari Metrics Timeline Event Converter</h3>
+<p>Ambari Metrics Timeline Event Converter defines a mapping between druid metrics name plus dimensions to a timeline event metricName.
+ambari-metrics metric path is organized using the following schema:
+<code>&lt;namespacePrefix&gt;.[&lt;druid service name&gt;].[&lt;druid hostname&gt;].&lt;druid metrics dimensions&gt;.&lt;druid metrics name&gt;</code>
+Properly naming the metrics is critical to avoid conflicts, confusing data and potentially wrong interpretation later on.</p>
+<p>Example <code>druid.historical.hist-host1:8080.MyDataSourceName.GroupBy.query/time</code>:</p>
+<ul>
+<li><code>druid</code> -&gt; namespace prefix</li>
+<li><code>historical</code> -&gt; service name</li>
+<li><code>hist-host1:8080</code> -&gt; druid hostname</li>
+<li><code>MyDataSourceName</code> -&gt; dimension value</li>
+<li><code>GroupBy</code> -&gt; dimension value</li>
+<li><code>query/time</code> -&gt; metric name</li>
+</ul>
+<p>We have two different implementation of event converter:</p>
+<h4><a class="anchor" aria-hidden="true" id="send-all-converter"></a><a href="#send-all-converter" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Send-All converter</h4>
+<p>The first implementation called <code>all</code>, will send all the druid service metrics events.
+The path will be in the form <code>&lt;namespacePrefix&gt;.[&lt;druid service name&gt;].[&lt;druid hostname&gt;].&lt;dimensions values ordered by dimension's name&gt;.&lt;metric&gt;</code>
+User has control of <code>&lt;namespacePrefix&gt;.[&lt;druid service name&gt;].[&lt;druid hostname&gt;].</code></p>
+<pre><code class="hljs css language-json">
+druid.emitter.ambari-metrics.eventConverter={"type":"all", "namespacePrefix": "druid.test", "appName":"druid"}
+
+</code></pre>
+<h4><a class="anchor" aria-hidden="true" id="white-list-based-converter"></a><a href="#white-list-based-converter" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>White-list based converter</h4>
+<p>The second implementation called <code>whiteList</code>, will send only the white listed metrics and dimensions.
+Same as for the <code>all</code> converter user has control of <code>&lt;namespacePrefix&gt;.[&lt;druid service name&gt;].[&lt;druid hostname&gt;].</code>
+White-list based converter comes with the following  default white list map located under resources in <code>./src/main/resources/defaultWhiteListMap.json</code></p>
+<p>Although user can override the default white list map by supplying a property called <code>mapPath</code>.
+This property is a String containing  the path for the file containing <strong>white list map JSON object</strong>.
+For example the following converter will read the map from the file <code>/pathPrefix/fileName.json</code>.</p>
+<pre><code class="hljs css language-json">
+druid.emitter.ambari-metrics.eventConverter={"type":"whiteList", "namespacePrefix": "druid.test", "ignoreHostname":true, "appName":"druid", "mapPath":"/pathPrefix/fileName.json"}
+
+</code></pre>
+<p><strong>Druid emits a huge number of metrics we highly recommend to use the <code>whiteList</code> converter</strong></p>
+</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/0.20.0/development/extensions-core/test-stats.html"><span class="arrow-prev">← </span><span>Test Stats Aggregators</span></a><a class="docs-next button" href="/docs/0.20.0/development/extensions-contrib/cassandra.html"><span>Apache Cassandra</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#introduction">Introduction</a></li><li><a href="#configuration">Configuration</a><ul class="toc-headings"><li><a href="#druid-to-ambari-metrics-timeline-event-converter">Druid to Ambari Metrics Timeline Event Converter</a></li></ul></li></ul></nav></div><footer class="nav-footer druid-footer" id="footer"><div class="container"><div class="text-center"><p><a href="/technology">Technology</a> · <a href="/use-cases">Use Cases</a> · <a href="/druid-powered">Powered by Druid</a> · <a href="/docs/0.20.0/latest">Docs</a> · <a href="/community/">Community</a> · <a href="/downloads.html">Download</a> · <a href="/faq">FAQ</a></p></div><div class="text-center"><a title="Join the user group" href="https://groups.google.com/forum/#!forum/druid-user" target="_blank"><span class="fa fa-comments"></span></a> · <a title="Follow Druid" href="https://twitter.com/druidio" target="_blank"><span class="fab fa-twitter"></span></a> · <a title="Download via Apache" href="https://www.apache.org/dyn/closer.cgi?path=/incubator/druid/{{ site.druid_versions[0].versions[0].version }}/apache-druid-{{ site.druid_versions[0].versions[0].version }}-bin.tar.gz" target="_blank"><span class="fas fa-feather"></span></a> · <a title="GitHub" href="https://github.com/apache/druid" target="_blank"><span class="fab fa-github"></span></a></div><div class="text-center license">Copyright © 2019 <a href="https://www.apache.org/" target="_blank">Apache Software Foundation</a>.<br/>Except where otherwise noted, licensed under <a rel="license" href="http://creativecommons.org/licenses/by-sa/4.0/">CC BY-SA 4.0</a>.<br/>Apache Druid, Druid, and the Druid logo are either registered trademarks or trademarks of The Apache Software Foundation in the United States and other countries.</div></div></footer></div><script type="text/javascript" src="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.js"></script><script>
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aggregators</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-contrib/gce-extensions.html">GCE Extensions</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-contrib/aliyun-oss.html">Aliyun OSS</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/querying/hll-old.html">Cardinality/HyperUnique aggregators</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/querying/select-query.html">Select</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/ingestion/standalone-realtime.html">Realtime Process</a></li></ul></div></div></section></div><script>
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+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
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+<p>To use this Apache Druid extension, make sure to <a href="/docs/0.20.0/development/extensions.html#loading-extensions">include</a> <code>druid-cassandra-storage</code> extension.</p>
+<p><a href="http://www.datastax.com/what-we-offer/products-services/datastax-enterprise/apache-cassandra">Apache Cassandra</a> can also
+be leveraged for deep storage.  This requires some additional Druid configuration as well as setting up the necessary
+schema within a Cassandra keystore.</p>
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+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
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+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+  -->
+<p>To use this Apache Druid extension, make sure to <a href="/docs/0.20.0/development/extensions.html#loading-extensions">include</a> <code>druid-cloudfiles-extensions</code> extension.</p>
+<h2><a class="anchor" aria-hidden="true" id="deep-storage"></a><a href="#deep-storage" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Deep Storage</h2>
+<p><a href="http://www.rackspace.com/cloud/files/">Rackspace Cloud Files</a> is another option for deep storage. This requires some additional Druid configuration.</p>
+<table>
+<thead>
+<tr><th>Property</th><th>Possible Values</th><th>Description</th><th>Default</th></tr>
+</thead>
+<tbody>
+<tr><td><code>druid.storage.type</code></td><td>cloudfiles</td><td></td><td>Must be set.</td></tr>
+<tr><td><code>druid.storage.region</code></td><td></td><td>Rackspace Cloud Files region.</td><td>Must be set.</td></tr>
+<tr><td><code>druid.storage.container</code></td><td></td><td>Rackspace Cloud Files container name.</td><td>Must be set.</td></tr>
+<tr><td><code>druid.storage.basePath</code></td><td></td><td>Rackspace Cloud Files base path to use in the container.</td><td>Must be set.</td></tr>
+<tr><td><code>druid.storage.operationMaxRetries</code></td><td></td><td>Number of tries before cancel a Rackspace operation.</td><td>10</td></tr>
+<tr><td><code>druid.cloudfiles.userName</code></td><td></td><td>Rackspace Cloud username</td><td>Must be set.</td></tr>
+<tr><td><code>druid.cloudfiles.apiKey</code></td><td></td><td>Rackspace Cloud API key.</td><td>Must be set.</td></tr>
+<tr><td><code>druid.cloudfiles.provider</code></td><td>rackspace-cloudfiles-us,rackspace-cloudfiles-uk</td><td>Name of the provider depending on the region.</td><td>Must be set.</td></tr>
+<tr><td><code>druid.cloudfiles.useServiceNet</code></td><td>true,false</td><td>Whether to use the internal service net.</td><td>true</td></tr>
+</tbody>
+</table>
+<h2><a class="anchor" aria-hidden="true" id="firehose"></a><a href="#firehose" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Firehose</h2>
+<p><a name="firehose"></a></p>
+<h4><a class="anchor" aria-hidden="true" id="staticcloudfilesfirehose"></a><a href="#staticcloudfilesfirehose" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>StaticCloudFilesFirehose</h4>
+<p>This firehose ingests events, similar to the StaticAzureBlobStoreFirehose, but from Rackspace's Cloud Files.</p>
+<p>Data is newline delimited, with one JSON object per line and parsed as per the <code>InputRowParser</code> configuration.</p>
+<p>The storage account is shared with the one used for Rackspace's Cloud Files deep storage functionality, but blobs can be in a different region and container.</p>
+<p>As with the Azure blobstore, it is assumed to be gzipped if the extension ends in .gz</p>
+<p>This firehose is <em>splittable</em> and can be used by <a href="/docs/0.20.0/ingestion/native-batch.html#parallel-task">native parallel index tasks</a>.
+Since each split represents an object in this firehose, each worker task of <code>index_parallel</code> will read an object.</p>
+<p>Sample spec:</p>
+<pre><code class="hljs css language-json">"firehose" : {
+    "type" : "static-cloudfiles",
+    "blobs": [
+        {
+          "region": "DFW"
+          "container": "container",
+          "path": "/path/to/your/file.json"
+        },
+        {
+          "region": "ORD"
+          "container": "anothercontainer",
+          "path": "/another/path.json"
+        }
+    ]
+}
+</code></pre>
+<p>This firehose provides caching and prefetching features. In IndexTask, a firehose can be read twice if intervals or
+shardSpecs are not specified, and, in this case, caching can be useful. Prefetching is preferred when direct scan of objects is slow.</p>
+<table>
+<thead>
+<tr><th>property</th><th>description</th><th>default</th><th>required?</th></tr>
+</thead>
+<tbody>
+<tr><td>type</td><td>This should be <code>static-cloudfiles</code>.</td><td>N/A</td><td>yes</td></tr>
+<tr><td>blobs</td><td>JSON array of Cloud Files blobs.</td><td>N/A</td><td>yes</td></tr>
+<tr><td>maxCacheCapacityBytes</td><td>Maximum size of the cache space in bytes. 0 means disabling cache.</td><td>1073741824</td><td>no</td></tr>
+<tr><td>maxCacheCapacityBytes</td><td>Maximum size of the cache space in bytes. 0 means disabling cache. Cached files are not removed until the ingestion task completes.</td><td>1073741824</td><td>no</td></tr>
+<tr><td>maxFetchCapacityBytes</td><td>Maximum size of the fetch space in bytes. 0 means disabling prefetch. Prefetched files are removed immediately once they are read.</td><td>1073741824</td><td>no</td></tr>
+<tr><td>fetchTimeout</td><td>Timeout for fetching a Cloud Files object.</td><td>60000</td><td>no</td></tr>
+<tr><td>maxFetchRetry</td><td>Maximum retry for fetching a Cloud Files object.</td><td>3</td><td>no</td></tr>
+</tbody>
+</table>
+<p>Cloud Files Blobs:</p>
+<table>
+<thead>
+<tr><th>property</th><th>description</th><th>default</th><th>required?</th></tr>
+</thead>
+<tbody>
+<tr><td>container</td><td>Name of the Cloud Files container</td><td>N/A</td><td>yes</td></tr>
+<tr><td>path</td><td>The path where data is located.</td><td>N/A</td><td>yes</td></tr>
+</tbody>
+</table>
+</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/0.20.0/development/extensions-contrib/cassandra.html"><span class="arrow-prev">← </span><span>Apache Cassandra</span></a><a class="docs-next button" href="/docs/0.20.0/development/extensions-contrib/distinctcount.html"><span class="function-name-prevnext">DistinctCount Aggregator</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#deep-storage">Deep Storage</a></li><li><a href="#firehose">Firehose</a></li></ul></nav></div><footer class="nav-footer druid-footer" id="footer"><div class="container"><div class="text-center"><p><a href="/technology">Technology</a> · <a href="/use-cases">Use Cases</a> · <a href="/druid-powered">Powered by Druid</a> · <a href="/docs/0.20.0/latest">Docs</a> · <a href="/community/">Community</a> · <a href="/downloads.html">Download</a> · <a href="/faq">FAQ</a></p></div><div class="text-center"><a title="Join the user group" href="https://groups.google.com/forum/#!forum/druid-user" target="_blank"><span class="fa fa-comments"></span></a> · <a title="Follow Druid" href="https://twitter.com/druidio" target="_blank"><span class="fab fa-twitter"></span></a> · <a title="Download via Apache" href="https://www.apache.org/dyn/closer.cgi?path=/incubator/druid/{{ site.druid_versions[0].versions[0].version }}/apache-druid-{{ site.druid_versions[0].versions[0].version }}-bin.tar.gz" target="_blank"><span class="fas fa-feather"></span></a> · <a title="GitHub" href="https://github.com/apache/druid" target="_blank"><span class="fab fa-github"></span></a></div><div class="text-center license">Copyright © 2019 <a href="https://www.apache.org/" target="_blank">Apache Software Foundation</a>.<br/>Except where otherwise noted, licensed under <a rel="license" href="http://creativecommons.org/licenses/by-sa/4.0/">CC BY-SA 4.0</a>.<br/>Apache Druid, Druid, and the Druid logo are either registered trademarks or trademarks of The Apache Software Foundation in the United States and other countries.</div></div></footer></div><script type="text/javascript" src="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.js"></script><script>
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+        </script></nav></div><div class="container mainContainer docsContainer"><div class="wrapper"><div class="post"><header class="postHeader"><a class="edit-page-link button" href="https://github.com/apache/druid/edit/master/docs/development/extensions-contrib/distinctcount.md" target="_blank" rel="noreferrer noopener">Edit</a><h1 id="__docusaurus" class="postHeaderTitle">DistinctCount Aggregator</h1></header><article><div><span><!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
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+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+  -->
+<p>To use this Apache Druid extension, make sure to <a href="/docs/0.20.0/development/extensions.html#loading-extensions">include</a> the <code>druid-distinctcount</code> extension.</p>
+<p>Additionally, follow these steps:</p>
+<ol>
+<li>First, use a single dimension hash-based partition spec to partition data by a single dimension. For example visitor_id. This to make sure all rows with a particular value for that dimension will go into the same segment, or this might over count.</li>
+<li>Second, use distinctCount to calculate the distinct count, make sure queryGranularity is divided exactly by segmentGranularity or else the result will be wrong.</li>
+</ol>
+<p>There are some limitations, when used with groupBy, the groupBy keys' numbers should not exceed maxIntermediateRows in every segment. If exceeded the result will be wrong. When used with topN, numValuesPerPass should not be too big. If too big the distinctCount will use a lot of memory and might cause the JVM to go our of memory.</p>
+<p>Example:</p>
+<h2><a class="anchor" aria-hidden="true" id="timeseries-query"></a><a href="#timeseries-query" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Timeseries query</h2>
+<pre><code class="hljs css language-json">{
+  <span class="hljs-attr">"queryType"</span>: <span class="hljs-string">"timeseries"</span>,
+  <span class="hljs-attr">"dataSource"</span>: <span class="hljs-string">"sample_datasource"</span>,
+  <span class="hljs-attr">"granularity"</span>: <span class="hljs-string">"day"</span>,
+  <span class="hljs-attr">"aggregations"</span>: [
+    {
+      <span class="hljs-attr">"type"</span>: <span class="hljs-string">"distinctCount"</span>,
+      <span class="hljs-attr">"name"</span>: <span class="hljs-string">"uv"</span>,
+      <span class="hljs-attr">"fieldName"</span>: <span class="hljs-string">"visitor_id"</span>
+    }
+  ],
+  <span class="hljs-attr">"intervals"</span>: [
+    <span class="hljs-string">"2016-03-01T00:00:00.000/2013-03-20T00:00:00.000"</span>
+  ]
+}
+</code></pre>
+<h2><a class="anchor" aria-hidden="true" id="topn-query"></a><a href="#topn-query" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>TopN query</h2>
+<pre><code class="hljs css language-json">{
+  <span class="hljs-attr">"queryType"</span>: <span class="hljs-string">"topN"</span>,
+  <span class="hljs-attr">"dataSource"</span>: <span class="hljs-string">"sample_datasource"</span>,
+  <span class="hljs-attr">"dimension"</span>: <span class="hljs-string">"sample_dim"</span>,
+  <span class="hljs-attr">"threshold"</span>: <span class="hljs-number">5</span>,
+  <span class="hljs-attr">"metric"</span>: <span class="hljs-string">"uv"</span>,
+  <span class="hljs-attr">"granularity"</span>: <span class="hljs-string">"all"</span>,
+  <span class="hljs-attr">"aggregations"</span>: [
+    {
+      <span class="hljs-attr">"type"</span>: <span class="hljs-string">"distinctCount"</span>,
+      <span class="hljs-attr">"name"</span>: <span class="hljs-string">"uv"</span>,
+      <span class="hljs-attr">"fieldName"</span>: <span class="hljs-string">"visitor_id"</span>
+    }
+  ],
+  <span class="hljs-attr">"intervals"</span>: [
+    <span class="hljs-string">"2016-03-06T00:00:00/2016-03-06T23:59:59"</span>
+  ]
+}
+</code></pre>
+<h2><a class="anchor" aria-hidden="true" id="groupby-query"></a><a href="#groupby-query" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>GroupBy query</h2>
+<pre><code class="hljs css language-json">{
+  <span class="hljs-attr">"queryType"</span>: <span class="hljs-string">"groupBy"</span>,
+  <span class="hljs-attr">"dataSource"</span>: <span class="hljs-string">"sample_datasource"</span>,
+  <span class="hljs-attr">"dimensions"</span>: [<span class="hljs-string">"sample_dim"</span>],
+  <span class="hljs-attr">"granularity"</span>: <span class="hljs-string">"all"</span>,
+  <span class="hljs-attr">"aggregations"</span>: [
+    {
+      <span class="hljs-attr">"type"</span>: <span class="hljs-string">"distinctCount"</span>,
+      <span class="hljs-attr">"name"</span>: <span class="hljs-string">"uv"</span>,
+      <span class="hljs-attr">"fieldName"</span>: <span class="hljs-string">"visitor_id"</span>
+    }
+  ],
+  <span class="hljs-attr">"intervals"</span>: [
+    <span class="hljs-string">"2016-03-06T00:00:00/2016-03-06T23:59:59"</span>
+  ]
+}
+</code></pre>
+</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/0.20.0/development/extensions-contrib/cloudfiles.html"><span class="arrow-prev">← </span><span>Rackspace Cloud Files</span></a><a class="docs-next button" href="/docs/0.20.0/development/extensions-contrib/graphite.html"><span>Graphite Emitter</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#timeseries-query">Timeseries query</a></li><li><a href="#topn-query">TopN query</a></li><li><a href="#groupby-query">GroupBy query</a></li></ul></nav></div><footer class="nav-footer druid-footer" id="footer"><div class="container"><div class="text-center"><p><a href="/technology">Technology</a> · <a href="/use-cases">Use Cases</a> · <a href="/druid-powered">Powered by Druid</a> · <a href="/docs/0.20.0/latest">Docs</a> · <a href="/community/">Community</a> · <a href="/downloads.html">Download</a> · <a href="/faq">FAQ</a></p></div><div class="text-center"><a title="Join the user group" href="https://groups.google.com/forum/#!forum/druid-user" target="_blank"><span class="fa fa-comments"></span></a> · <a title="Follow Druid" href="https://twitter.com/druidio" target="_blank"><span class="fab fa-twitter"></span></a> · <a title="Download via Apache" href="https://www.apache.org/dyn/closer.cgi?path=/incubator/druid/{{ site.druid_versions[0].versions[0].version }}/apache-druid-{{ site.druid_versions[0].versions[0].version }}-bin.tar.gz" target="_blank"><span class="fas fa-feather"></span></a> · <a title="GitHub" href="https://github.com/apache/druid" target="_blank"><span class="fab fa-github"></span></a></div><div class="text-center license">Copyright © 2019 <a href="https://www.apache.org/" target="_blank">Apache Software Foundation</a>.<br/>Except where otherwise noted, licensed under <a rel="license" href="http://creativecommons.org/licenses/by-sa/4.0/">CC BY-SA 4.0</a>.<br/>Apache Druid, Druid, and the Druid logo are either registered trademarks or trademarks of The Apache Software Foundation in the United States and other countries.</div></div></footer></div><script type="text/javascript" src="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.js"></script><script>
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UIs</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/operations/deep-storage-migration.html">Deep storage migration</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/operations/export-metadata.html">Export Metadata Tool</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/operations/metadata-migration.html">Metadata Migration</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/operations/segment-optimization.html">Segment Size Optimization</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/operations/use_sbt_to_build_fat_jar.html">Content for build.sbt</a></li></ul></div></ul></div><div class="navGroup"><h3 class="navGroupCategoryTitle collapsible">Development<span class="arrow"><svg width="24" height="24" viewBox="0 0 24 24"><path fill="#565656" d="M7.41 15.41L12 10.83l4.59 4.58L18 14l-6-6-6 6z"></path><path d="M0 0h24v24H0z" fill="none"></path></svg></span></h3><ul class="hide"><li 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+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
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+  ~   http://www.apache.org/licenses/LICENSE-2.0
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+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+  -->
+<p>To use this Apache Druid (incubating) extension, make sure to <a href="/docs/0.20.0/development/extensions.html#loading-extensions">include</a> <code>gce-extensions</code>.</p>
+<p>At the moment, this extension enables only Druid to autoscale instances in GCE.</p>
+<p>The extension manages the instances to be scaled up and down through the use of the <a href="https://cloud.google.com/compute/docs/instance-groups/creating-groups-of-managed-instances#resize_managed_group">Managed Instance Groups</a>
+of GCE (MIG from now on). This choice has been made to ease the configuration of the machines and simplify their
+management.</p>
+<p>For this reason, in order to use this extension, the user must have created</p>
+<ol>
+<li>An instance template with the right machine type and image to bu used to run the MiddleManager</li>
+<li>A MIG that has been configured to use the instance template created in the point above</li>
+</ol>
+<p>Moreover, in order to be able to rescale the machines in the MIG, the Overlord must run with a service account
+guaranteeing the following two scopes from the <a href="https://developers.google.com/identity/protocols/googlescopes#computev1">Compute Engine API</a></p>
+<ul>
+<li><code>https://www.googleapis.com/auth/cloud-platform</code></li>
+<li><code>https://www.googleapis.com/auth/compute</code></li>
+</ul>
+<h2><a class="anchor" aria-hidden="true" id="overlord-dynamic-configuration"></a><a href="#overlord-dynamic-configuration" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Overlord Dynamic Configuration</h2>
+<p>The Overlord can dynamically change worker behavior.</p>
+<p>The JSON object can be submitted to the Overlord via a POST request at:</p>
+<pre><code class="hljs">http:<span class="hljs-regexp">//</span>&lt;OVERLORD_IP&gt;:&lt;port&gt;<span class="hljs-regexp">/druid/i</span>ndexer<span class="hljs-regexp">/v1/</span>worker
+</code></pre>
+<p>Optional Header Parameters for auditing the config change can also be specified.</p>
+<table>
+<thead>
+<tr><th>Header Param Name</th><th>Description</th><th>Default</th></tr>
+</thead>
+<tbody>
+<tr><td><code>X-Druid-Author</code></td><td>author making the config change</td><td>&quot;&quot;</td></tr>
+<tr><td><code>X-Druid-Comment</code></td><td>comment describing the change being done</td><td>&quot;&quot;</td></tr>
+</tbody>
+</table>
+<p>A sample worker config spec is shown below:</p>
+<pre><code class="hljs css language-json">{
+  <span class="hljs-attr">"autoScaler"</span>: {
+    <span class="hljs-attr">"envConfig"</span> : {
+      <span class="hljs-attr">"numInstances"</span> : <span class="hljs-number">1</span>,
+      <span class="hljs-attr">"projectId"</span> : <span class="hljs-string">"super-project"</span>,
+      <span class="hljs-attr">"zoneName"</span> : <span class="hljs-string">"us-central-1"</span>,
+      <span class="hljs-attr">"managedInstanceGroupName"</span> : <span class="hljs-string">"druid-middlemanagers"</span>
+    },
+    <span class="hljs-attr">"maxNumWorkers"</span> : <span class="hljs-number">4</span>,
+    <span class="hljs-attr">"minNumWorkers"</span> : <span class="hljs-number">2</span>,
+    <span class="hljs-attr">"type"</span> : <span class="hljs-string">"gce"</span>
+  }
+}
+</code></pre>
+<p>The configuration of the autoscaler is quite simple and it is made of two levels only.</p>
+<p>The external level specifies the <code>type</code>—always <code>gce</code> in this case— and two numeric values,
+the <code>maxNumWorkers</code> and <code>minNumWorkers</code> used to define the boundaries in between which the
+number of instances must be at any time.</p>
+<p>The internal level is the <code>envConfig</code> and it is used to specify</p>
+<ul>
+<li>The <code>numInstances</code> used to specify how many workers will be spawned at each
+request to provision more workers.  This is safe to be left to <code>1</code></li>
+<li>The <code>projectId</code> used to specify the name of the project in which the MIG resides</li>
+<li>The <code>zoneName</code> used to identify in which zone of the worlds the MIG is</li>
+<li>The <code>managedInstanceGroupName</code> used to specify the MIG containing the instances created or
+removed</li>
+</ul>
+<p>Please refer to the Overlord Dynamic Configuration section in the main <a href="/docs/0.20.0/configuration/index.html">documentation</a>
+for parameters other than the ones specified here, such as <code>selectStrategy</code> etc.</p>
+<h2><a class="anchor" aria-hidden="true" id="known-limitations"></a><a href="#known-limitations" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Known limitations</h2>
+<ul>
+<li>The module internally uses the <a href="https://cloud.google.com/compute/docs/reference/rest/v1/instanceGroupManagers/listManagedInstances">ListManagedInstances</a>
+call from the API and, while the documentation of the API states that the call can be paged through using the
+<code>pageToken</code> argument, the responses to such call do not provide any <code>nextPageToken</code> to set such parameter. This means
+that the extension can operate safely with a maximum of 500 MiddleManagers instances at any time (the maximum number
+of instances to be returned for each call).</li>
+</ul>
+</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/0.20.0/development/extensions-contrib/time-min-max.html"><span class="arrow-prev">← </span><span>Timestamp Min/Max aggregators</span></a><a class="docs-next button" href="/docs/0.20.0/development/extensions-contrib/aliyun-oss.html"><span>Aliyun OSS</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#overlord-dynamic-configuration">Overlord Dynamic Configuration</a></li><li><a href="#known-limitations">Known limitations</a></li></ul></nav></div><footer class="nav-footer druid-footer" id="footer"><div class="container"><div class="text-center"><p><a href="/technology">Technology</a> · <a href="/use-cases">Use Cases</a> · <a href="/druid-powered">Powered by Druid</a> · <a href="/docs/0.20.0/latest">Docs</a> · <a href="/community/">Community</a> · <a href="/downloads.html">Download</a> · <a href="/faq">FAQ</a></p></div><div class="text-center"><a title="Join the user group" href="https://groups.google.com/forum/#!forum/druid-user" target="_blank"><span class="fa fa-comments"></span></a> · <a title="Follow Druid" href="https://twitter.com/druidio" target="_blank"><span class="fab fa-twitter"></span></a> · <a title="Download via Apache" href="https://www.apache.org/dyn/closer.cgi?path=/incubator/druid/{{ site.druid_versions[0].versions[0].version }}/apache-druid-{{ site.druid_versions[0].versions[0].version }}-bin.tar.gz" target="_blank"><span class="fas fa-feather"></span></a> · <a title="GitHub" href="https://github.com/apache/druid" target="_blank"><span class="fab fa-github"></span></a></div><div class="text-center license">Copyright © 2019 <a href="https://www.apache.org/" target="_blank">Apache Software Foundation</a>.<br/>Except where otherwise noted, licensed under <a rel="license" href="http://creativecommons.org/licenses/by-sa/4.0/">CC BY-SA 4.0</a>.<br/>Apache Druid, Druid, and the Druid logo are either registered trademarks or trademarks of The Apache Software Foundation in the United States and other countries.</div></div></footer></div><script type="text/javascript" src="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.js"></script><script>
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+  ~ Licensed to the Apache Software Foundation (ASF) under one
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+<p>To use this Apache Druid extension, make sure to <a href="/docs/0.20.0/development/extensions.html#loading-extensions">include</a> <code>graphite-emitter</code> extension.</p>
+<h2><a class="anchor" aria-hidden="true" id="introduction"></a><a href="#introduction" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Introduction</h2>
+<p>This extension emits druid metrics to a graphite carbon server.
+Metrics can be sent by using <a href="http://graphite.readthedocs.io/en/latest/feeding-carbon.html#the-plaintext-protocol">plaintext</a> or <a href="http://graphite.readthedocs.io/en/latest/feeding-carbon.html#the-pickle-protocol">pickle</a> protocol.
+The pickle protocol is more efficient and supports sending batches of metrics (plaintext protocol send only one metric) in one request; batch size is configurable.</p>
+<h2><a class="anchor" aria-hidden="true" id="configuration"></a><a href="#configuration" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Configuration</h2>
+<p>All the configuration parameters for graphite emitter are under <code>druid.emitter.graphite</code>.</p>
+<table>
+<thead>
+<tr><th>property</th><th>description</th><th>required?</th><th>default</th></tr>
+</thead>
+<tbody>
+<tr><td><code>druid.emitter.graphite.hostname</code></td><td>The hostname of the graphite server.</td><td>yes</td><td>none</td></tr>
+<tr><td><code>druid.emitter.graphite.port</code></td><td>The port of the graphite server.</td><td>yes</td><td>none</td></tr>
+<tr><td><code>druid.emitter.graphite.batchSize</code></td><td>Number of events to send as one batch (only for pickle protocol)</td><td>no</td><td>100</td></tr>
+<tr><td><code>druid.emitter.graphite.protocol</code></td><td>Graphite protocol; available protocols: pickle, plaintext.</td><td>no</td><td>pickle</td></tr>
+<tr><td><code>druid.emitter.graphite.eventConverter</code></td><td>Filter and converter of druid events to graphite event (please see next section).</td><td>yes</td><td>none</td></tr>
+<tr><td><code>druid.emitter.graphite.flushPeriod</code></td><td>Queue flushing period in milliseconds.</td><td>no</td><td>1 minute</td></tr>
+<tr><td><code>druid.emitter.graphite.maxQueueSize</code></td><td>Maximum size of the queue used to buffer events.</td><td>no</td><td><code>MAX_INT</code></td></tr>
+<tr><td><code>druid.emitter.graphite.alertEmitters</code></td><td>List of emitters where alerts will be forwarded to. This is a JSON list of emitter names, e.g. <code>[&quot;logging&quot;, &quot;http&quot;]</code></td><td>no</td><td>empty list (no forwarding)</td></tr>
+<tr><td><code>druid.emitter.graphite.requestLogEmitters</code></td><td>List of emitters where request logs (i.e., query logging events sent to emitters when <code>druid.request.logging.type</code> is set to <code>emitter</code>) will be forwarded to. This is a JSON list of emitter names, e.g. <code>[&quot;logging&quot;, &quot;http&quot;]</code></td><td>no</td><td>empty list (no forwarding)</td></tr>
+<tr><td><code>druid.emitter.graphite.emitWaitTime</code></td><td>wait time in milliseconds to try to send the event otherwise emitter will throwing event.</td><td>no</td><td>0</td></tr>
+<tr><td><code>druid.emitter.graphite.waitForEventTime</code></td><td>waiting time in milliseconds if necessary for an event to become available.</td><td>no</td><td>1000 (1 sec)</td></tr>
+</tbody>
+</table>
+<h3><a class="anchor" aria-hidden="true" id="supported-event-types"></a><a href="#supported-event-types" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Supported event types</h3>
+<p>The graphite emitter only emits service metric events to graphite (See <a href="/docs/0.20.0/operations/metrics.html">Druid Metrics</a> for a list of metrics).</p>
+<p>Alerts and request logs are not sent to graphite. These event types are not well represented in Graphite, which is more suited for timeseries views on numeric metrics, vs. storing non-numeric log events.</p>
+<p>Instead, alerts and request logs are optionally forwarded to other emitter implementations, specified by <code>druid.emitter.graphite.alertEmitters</code> and <code>druid.emitter.graphite.requestLogEmitters</code> respectively.</p>
+<h3><a class="anchor" aria-hidden="true" id="druid-to-graphite-event-converter"></a><a href="#druid-to-graphite-event-converter" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Druid to Graphite Event Converter</h3>
+<p>Graphite Event Converter defines a mapping between druid metrics name plus dimensions to a Graphite metric path.
+Graphite metric path is organized using the following schema:
+<code>&lt;namespacePrefix&gt;.[&lt;druid service name&gt;].[&lt;druid hostname&gt;].&lt;druid metrics dimensions&gt;.&lt;druid metrics name&gt;</code>
+Properly naming the metrics is critical to avoid conflicts, confusing data and potentially wrong interpretation later on.</p>
+<p>Example <code>druid.historical.hist-host1_yahoo_com:8080.MyDataSourceName.GroupBy.query/time</code>:</p>
+<ul>
+<li><code>druid</code> -&gt; namespace prefix</li>
+<li><code>historical</code> -&gt; service name</li>
+<li><code>hist-host1.yahoo.com:8080</code> -&gt; druid hostname</li>
+<li><code>MyDataSourceName</code> -&gt; dimension value</li>
+<li><code>GroupBy</code> -&gt; dimension value</li>
+<li><code>query/time</code> -&gt; metric name</li>
+</ul>
+<p>We have two different implementation of event converter:</p>
+<h4><a class="anchor" aria-hidden="true" id="send-all-converter"></a><a href="#send-all-converter" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Send-All converter</h4>
+<p>The first implementation called <code>all</code>, will send all the druid service metrics events.
+The path will be in the form <code>&lt;namespacePrefix&gt;.[&lt;druid service name&gt;].[&lt;druid hostname&gt;].&lt;dimensions values ordered by dimension's name&gt;.&lt;metric&gt;</code>
+User has control of <code>&lt;namespacePrefix&gt;.[&lt;druid service name&gt;].[&lt;druid hostname&gt;].</code></p>
+<p>You can omit the hostname by setting <code>ignoreHostname=true</code>
+<code>druid.SERVICE_NAME.dataSourceName.queryType.query/time</code></p>
+<p>You can omit the service name by setting <code>ignoreServiceName=true</code>
+<code>druid.HOSTNAME.dataSourceName.queryType.query/time</code></p>
+<p>Elements in metric name by default are separated by &quot;/&quot;, so graphite will create all metrics on one level. If you want to have metrics in the tree structure, you have to set <code>replaceSlashWithDot=true</code>
+Original: <code>druid.HOSTNAME.dataSourceName.queryType.query/time</code>
+Changed: <code>druid.HOSTNAME.dataSourceName.queryType.query.time</code></p>
+<pre><code class="hljs css language-json">
+druid.emitter.graphite.eventConverter={"type":"all", "namespacePrefix": "druid.test", "ignoreHostname":true, "ignoreServiceName":true}
+
+</code></pre>
+<h4><a class="anchor" aria-hidden="true" id="white-list-based-converter"></a><a href="#white-list-based-converter" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>White-list based converter</h4>
+<p>The second implementation called <code>whiteList</code>, will send only the white listed metrics and dimensions.
+Same as for the <code>all</code> converter user has control of <code>&lt;namespacePrefix&gt;.[&lt;druid service name&gt;].[&lt;druid hostname&gt;].</code>
+White-list based converter comes with the following  default white list map located under resources in <code>./src/main/resources/defaultWhiteListMap.json</code></p>
+<p>Although user can override the default white list map by supplying a property called <code>mapPath</code>.
+This property is a String containing the path for the file containing <strong>white list map JSON object</strong>.
+For example the following converter will read the map from the file <code>/pathPrefix/fileName.json</code>.</p>
+<pre><code class="hljs css language-json">
+druid.emitter.graphite.eventConverter={"type":"whiteList", "namespacePrefix": "druid.test", "ignoreHostname":true, "ignoreServiceName":true, "mapPath":"/pathPrefix/fileName.json"}
+
+</code></pre>
+<p><strong>Druid emits a huge number of metrics we highly recommend to use the <code>whiteList</code> converter</strong></p>
+</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/0.20.0/development/extensions-contrib/distinctcount.html"><span class="arrow-prev">← </span><span class="function-name-prevnext">DistinctCount Aggregator</span></a><a class="docs-next button" href="/docs/0.20.0/development/extensions-contrib/influx.html"><span class="function-name-prevnext">InfluxDB Line Protocol Parser</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#introduction">Introduction</a></li><li><a href="#configuration">Configuration</a><ul class="toc-headings"><li><a href="#supported-event-types">Supported event types</a></li><li><a href="#druid-to-graphite-event-converter">Druid to Graphite Event Converter</a></li></ul></li></ul></nav></div><footer class="nav-footer druid-footer" id="footer"><div class="container"><div class="text-center"><p><a href="/technology">Technology</a> · <a href="/use-cases">Use Cases</a> · <a href="/druid-powered">Powered by Druid</a> · <a href="/docs/0.20.0/latest">Docs</a> · <a href="/community/">Community</a> · <a href="/downloads.html">Download</a> · <a href="/faq">FAQ</a></p></div><div class="text-center"><a title="Join the user group" href="https://groups.google.com/forum/#!forum/druid-user" target="_blank"><span class="fa fa-comments"></span></a> · <a title="Follow Druid" href="https://twitter.com/druidio" target="_blank"><span class="fab fa-twitter"></span></a> · <a title="Download via Apache" href="https://www.apache.org/dyn/closer.cgi?path=/incubator/druid/{{ site.druid_versions[0].versions[0].version }}/apache-druid-{{ site.druid_versions[0].versions[0].version }}-bin.tar.gz" target="_blank"><span class="fas fa-feather"></span></a> · <a title="GitHub" href="https://github.com/apache/druid" target="_blank"><span class="fab fa-github"></span></a></div><div class="text-center license">Copyright © 2019 <a href="https://www.apache.org/" target="_blank">Apache Software Foundation</a>.<br/>Except where otherwise noted, licensed under <a rel="license" href="http://creativecommons.org/licenses/by-sa/4.0/">CC BY-SA 4.0</a>.<br/>Apache Druid, Druid, and the Druid logo are either registered trademarks or trademarks of The Apache Software Foundation in the United States and other countries.</div></div></footer></div><script type="text/javascript" src="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.js"></script><script>
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UIs</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/operations/deep-storage-migration.html">Deep storage migration</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/operations/export-metadata.html">Export Metadata Tool</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/operations/metadata-migration.html">Metadata Migration</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/operations/segment-optimization.html">Segment Size Optimization</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/operations/use_sbt_to_build_fat_jar.html">Content for build.sbt</a></li></ul></div></ul></div><div class="navGroup"><h3 class="navGroupCategoryTitle collapsible">Development<span class="arrow"><svg width="24" height="24" viewBox="0 0 24 24"><path fill="#565656" d="M7.41 15.41L12 10.83l4.59 4.58L18 14l-6-6-6 6z"></path><path d="M0 0h24v24H0z" fill="none"></path></svg></span></h3><ul class="hide"><li 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+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
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+<p>To use this Apache Druid extension, make sure to <a href="/docs/0.20.0/development/extensions.html#loading-extensions">include</a> <code>druid-influx-extensions</code>.</p>
+<p>This extension enables Druid to parse the <a href="https://docs.influxdata.com/influxdb/v1.5/write_protocols/line_protocol_tutorial/">InfluxDB Line Protocol</a>, a popular text-based timeseries metric serialization format.</p>
+<h2><a class="anchor" aria-hidden="true" id="line-protocol"></a><a href="#line-protocol" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Line Protocol</h2>
+<p>A typical line looks like this:</p>
+<p><code>cpu,application=dbhost=prdb123,region=us-east-1 usage_idle=99.24,usage_user=0.55 1520722030000000000</code></p>
+<p>which contains four parts:</p>
+<ul>
+<li>measurement: A string indicating the name of the measurement represented (e.g. cpu, network, web_requests)</li>
+<li>tags: zero or more key-value pairs (i.e. dimensions)</li>
+<li>measurements: one or more key-value pairs; values can be numeric, boolean, or string</li>
+<li>timestamp: nanoseconds since Unix epoch (the parser truncates it to milliseconds)</li>
+</ul>
+<p>The parser extracts these fields into a map, giving the measurement the key <code>measurement</code> and the timestamp the key <code>_ts</code>. The tag and measurement keys are copied verbatim, so users should take care to avoid name collisions. It is up to the ingestion spec to decide which fields should be treated as dimensions and which should be treated as metrics (typically tags correspond to dimensions and measurements correspond to metrics).</p>
+<p>The parser is configured like so:</p>
+<pre><code class="hljs css language-json">"parser": {
+      "type": "string",
+      "parseSpec": {
+        "format": "influx",
+        "timestampSpec": {
+          "column": "__ts",
+          "format": "millis"
+        },
+        "dimensionsSpec": {
+          "dimensionExclusions": [
+            "__ts"
+          ]
+        },
+        "whitelistMeasurements": [
+          "cpu"
+        ]
+      }
+</code></pre>
+<p>The <code>whitelistMeasurements</code> field is an optional list of strings. If present, measurements that do not match one of the strings in the list will be ignored.</p>
+</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/0.20.0/development/extensions-contrib/graphite.html"><span class="arrow-prev">← </span><span>Graphite Emitter</span></a><a class="docs-next button" href="/docs/0.20.0/development/extensions-contrib/influxdb-emitter.html"><span class="function-name-prevnext">InfluxDB Emitter</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#line-protocol">Line Protocol</a></li></ul></nav></div><footer class="nav-footer druid-footer" id="footer"><div class="container"><div class="text-center"><p><a href="/technology">Technology</a> · <a href="/use-cases">Use Cases</a> · <a href="/druid-powered">Powered by Druid</a> · <a href="/docs/0.20.0/latest">Docs</a> · <a href="/community/">Community</a> · <a href="/downloads.html">Download</a> · <a href="/faq">FAQ</a></p></div><div class="text-center"><a title="Join the user group" href="https://groups.google.com/forum/#!forum/druid-user" target="_blank"><span class="fa fa-comments"></span></a> · <a title="Follow Druid" href="https://twitter.com/druidio" target="_blank"><span class="fab fa-twitter"></span></a> · <a title="Download via Apache" href="https://www.apache.org/dyn/closer.cgi?path=/incubator/druid/{{ site.druid_versions[0].versions[0].version }}/apache-druid-{{ site.druid_versions[0].versions[0].version }}-bin.tar.gz" target="_blank"><span class="fas fa-feather"></span></a> · <a title="GitHub" href="https://github.com/apache/druid" target="_blank"><span class="fab fa-github"></span></a></div><div class="text-center license">Copyright © 2019 <a href="https://www.apache.org/" target="_blank">Apache Software Foundation</a>.<br/>Except where otherwise noted, licensed under <a rel="license" href="http://creativecommons.org/licenses/by-sa/4.0/">CC BY-SA 4.0</a>.<br/>Apache Druid, Druid, and the Druid logo are either registered trademarks or trademarks of The Apache Software Foundation in the United States and other countries.</div></div></footer></div><script type="text/javascript" src="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.js"></script><script>
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+  ~ Licensed to the Apache Software Foundation (ASF) under one
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+<p>To use this Apache Druid extension, make sure to <a href="/docs/0.20.0/development/extensions.html#loading-extensions">include</a> <code>druid-influxdb-emitter</code> extension.</p>
+<h2><a class="anchor" aria-hidden="true" id="introduction"></a><a href="#introduction" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Introduction</h2>
+<p>This extension emits druid metrics to <a href="https://www.influxdata.com/time-series-platform/influxdb/">InfluxDB</a> over HTTP. Currently this emitter only emits service metric events to InfluxDB (See <a href="/docs/0.20.0/operations/metrics.html">Druid metrics</a> for a list of metrics).
+When a metric event is fired it is added to a queue of events. After a configurable amount of time, the events on the queue are transformed to InfluxDB's line protocol
+and POSTed to the InfluxDB HTTP API. The entire queue is flushed at this point. The queue is also flushed as the emitter is shutdown.</p>
+<p>Note that authentication and authorization must be <a href="https://docs.influxdata.com/influxdb/v1.7/administration/authentication_and_authorization/">enabled</a> on the InfluxDB server.</p>
+<h2><a class="anchor" aria-hidden="true" id="configuration"></a><a href="#configuration" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Configuration</h2>
+<p>All the configuration parameters for the influxdb emitter are under <code>druid.emitter.influxdb</code>.</p>
+<table>
+<thead>
+<tr><th>Property</th><th>Description</th><th>Required?</th><th>Default</th></tr>
+</thead>
+<tbody>
+<tr><td><code>druid.emitter.influxdb.hostname</code></td><td>The hostname of the InfluxDB server.</td><td>Yes</td><td>N/A</td></tr>
+<tr><td><code>druid.emitter.influxdb.port</code></td><td>The port of the InfluxDB server.</td><td>No</td><td>8086</td></tr>
+<tr><td><code>druid.emitter.influxdb.databaseName</code></td><td>The name of the database in InfluxDB.</td><td>Yes</td><td>N/A</td></tr>
+<tr><td><code>druid.emitter.influxdb.maxQueueSize</code></td><td>The size of the queue that holds events.</td><td>No</td><td>Integer.MAX_VALUE(=2^31-1)</td></tr>
+<tr><td><code>druid.emitter.influxdb.flushPeriod</code></td><td>How often (in milliseconds) the events queue is parsed into Line Protocol and POSTed to InfluxDB.</td><td>No</td><td>60000</td></tr>
+<tr><td><code>druid.emitter.influxdb.flushDelay</code></td><td>How long (in milliseconds) the scheduled method will wait until it first runs.</td><td>No</td><td>60000</td></tr>
+<tr><td><code>druid.emitter.influxdb.influxdbUserName</code></td><td>The username for authenticating with the InfluxDB database.</td><td>Yes</td><td>N/A</td></tr>
+<tr><td><code>druid.emitter.influxdb.influxdbPassword</code></td><td>The password of the database authorized user</td><td>Yes</td><td>N/A</td></tr>
+<tr><td><code>druid.emitter.influxdb.dimensionWhitelist</code></td><td>A whitelist of metric dimensions to include as tags</td><td>No</td><td><code>[&quot;dataSource&quot;,&quot;type&quot;,&quot;numMetrics&quot;,&quot;numDimensions&quot;,&quot;threshold&quot;,&quot;dimension&quot;,&quot;taskType&quot;,&quot;taskStatus&quot;,&quot;tier&quot;]</code></td></tr>
+</tbody>
+</table>
+<h2><a class="anchor" aria-hidden="true" id="influxdb-line-protocol"></a><a href="#influxdb-line-protocol" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>InfluxDB Line Protocol</h2>
+<p>An example of how this emitter parses a Druid metric event into InfluxDB's <a href="https://docs.influxdata.com/influxdb/v1.7/write_protocols/line_protocol_reference/">line protocol</a> is given here:</p>
+<p>The syntax of the line protocol is :</p>
+<p><code>&lt;measurement&gt;[,&lt;tag_key&gt;=&lt;tag_value&gt;[,&lt;tag_key&gt;=&lt;tag_value&gt;]] &lt;field_key&gt;=&lt;field_value&gt;[,&lt;field_key&gt;=&lt;field_value&gt;] [&lt;timestamp&gt;]</code></p>
+<p>where timestamp is in nanoseconds since epoch.</p>
+<p>A typical service metric event as recorded by Druid's logging emitter is: <code>Event [{&quot;feed&quot;:&quot;metrics&quot;,&quot;timestamp&quot;:&quot;2017-10-31T09:09:06.857Z&quot;,&quot;service&quot;:&quot;druid/historical&quot;,&quot;host&quot;:&quot;historical001:8083&quot;,&quot;version&quot;:&quot;0.11.0-SNAPSHOT&quot;,&quot;metric&quot;:&quot;query/cache/total/hits&quot;,&quot;value&quot;:34787256}]</code>.</p>
+<p>This event is parsed into line protocol according to these rules:</p>
+<ul>
+<li>The measurement becomes druid_query since query is the first part of the metric.</li>
+<li>The tags are service=druid/historical, hostname=historical001, metric=druid_cache_total. (The metric tag is the middle part of the druid metric separated with _ and preceded by druid_. Another example would be if an event has metric=query/time then there is no middle part and hence no metric tag)</li>
+<li>The field is druid_hits since this is the last part of the metric.</li>
+</ul>
+<p>This gives the following String which can be POSTed to InfluxDB: <code>&quot;druid_query,service=druid/historical,hostname=historical001,metric=druid_cache_total druid_hits=34787256 1509440946857000000&quot;</code></p>
+<p>The InfluxDB emitter has a white list of dimensions
+which will be added as a tag to the line protocol string if the metric has a dimension from the white list.
+The value of the dimension is sanitized such that every occurrence of a dot or whitespace is replaced with a <code>_</code> .</p>
+</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/0.20.0/development/extensions-contrib/influx.html"><span class="arrow-prev">← </span><span class="function-name-prevnext">InfluxDB Line Protocol Parser</span></a><a class="docs-next button" href="/docs/0.20.0/development/extensions-contrib/kafka-emitter.html"><span>Kafka Emitter</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#introduction">Introduction</a></li><li><a href="#configuration">Configuration</a></li><li><a href="#influxdb-line-protocol">InfluxDB Line Protocol</a></li></ul></nav></div><footer class="nav-footer druid-footer" id="footer"><div class="container"><div class="text-center"><p><a href="/technology">Technology</a> · <a href="/use-cases">Use Cases</a> · <a href="/druid-powered">Powered by Druid</a> · <a href="/docs/0.20.0/latest">Docs</a> · <a href="/community/">Community</a> · <a href="/downloads.html">Download</a> · <a href="/faq">FAQ</a></p></div><div class="text-center"><a title="Join the user group" href="https://groups.google.com/forum/#!forum/druid-user" target="_blank"><span class="fa fa-comments"></span></a> · <a title="Follow Druid" href="https://twitter.com/druidio" target="_blank"><span class="fab fa-twitter"></span></a> · <a title="Download via Apache" href="https://www.apache.org/dyn/closer.cgi?path=/incubator/druid/{{ site.druid_versions[0].versions[0].version }}/apache-druid-{{ site.druid_versions[0].versions[0].version }}-bin.tar.gz" target="_blank"><span class="fas fa-feather"></span></a> · <a title="GitHub" href="https://github.com/apache/druid" target="_blank"><span class="fab fa-github"></span></a></div><div class="text-center license">Copyright © 2019 <a href="https://www.apache.org/" target="_blank">Apache Software Foundation</a>.<br/>Except where otherwise noted, licensed under <a rel="license" href="http://creativecommons.org/licenses/by-sa/4.0/">CC BY-SA 4.0</a>.<br/>Apache Druid, Druid, and the Druid logo are either registered trademarks or trademarks of The Apache Software Foundation in the United States and other countries.</div></div></footer></div><script type="text/javascript" src="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.js"></script><script>
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+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
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+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
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+  -->
+<p>To use this Apache Druid extension, make sure to <a href="/docs/0.20.0/development/extensions.html#loading-extensions">include</a> <code>kafka-emitter</code> extension.</p>
+<h2><a class="anchor" aria-hidden="true" id="introduction"></a><a href="#introduction" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Introduction</h2>
+<p>This extension emits Druid metrics to <a href="https://kafka.apache.org">Apache Kafka</a> directly with JSON format.<br>
+Currently, Kafka has not only their nice ecosystem but also consumer API readily available.
+So, If you currently use Kafka, It's easy to integrate various tool or UI
+to monitor the status of your Druid cluster with this extension.</p>
+<h2><a class="anchor" aria-hidden="true" id="configuration"></a><a href="#configuration" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Configuration</h2>
+<p>All the configuration parameters for the Kafka emitter are under <code>druid.emitter.kafka</code>.</p>
+<table>
+<thead>
+<tr><th>property</th><th>description</th><th>required?</th><th>default</th></tr>
+</thead>
+<tbody>
+<tr><td><code>druid.emitter.kafka.bootstrap.servers</code></td><td>Comma-separated Kafka broker. (<code>[hostname:port],[hostname:port]...</code>)</td><td>yes</td><td>none</td></tr>
+<tr><td><code>druid.emitter.kafka.metric.topic</code></td><td>Kafka topic name for emitter's target to emit service metric.</td><td>yes</td><td>none</td></tr>
+<tr><td><code>druid.emitter.kafka.alert.topic</code></td><td>Kafka topic name for emitter's target to emit alert.</td><td>yes</td><td>none</td></tr>
+<tr><td><code>druid.emitter.kafka.producer.config</code></td><td>JSON formatted configuration which user want to set additional properties to Kafka producer.</td><td>no</td><td>none</td></tr>
+<tr><td><code>druid.emitter.kafka.clusterName</code></td><td>Optional value to specify name of your druid cluster. It can help make groups in your monitoring environment.</td><td>no</td><td>none</td></tr>
+</tbody>
+</table>
+<h3><a class="anchor" aria-hidden="true" id="example"></a><a href="#example" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Example</h3>
+<pre><code class="hljs">druid<span class="hljs-selector-class">.emitter</span><span class="hljs-selector-class">.kafka</span><span class="hljs-selector-class">.bootstrap</span>.servers=hostname1:<span class="hljs-number">9092</span>,hostname2:<span class="hljs-number">9092</span>
+druid<span class="hljs-selector-class">.emitter</span><span class="hljs-selector-class">.kafka</span><span class="hljs-selector-class">.metric</span>.topic=druid-metric
+druid<span class="hljs-selector-class">.emitter</span><span class="hljs-selector-class">.kafka</span><span class="hljs-selector-class">.alert</span>.topic=druid-alert
+druid<span class="hljs-selector-class">.emitter</span><span class="hljs-selector-class">.kafka</span><span class="hljs-selector-class">.producer</span>.config={<span class="hljs-string">"max.block.ms"</span>:<span class="hljs-number">10000</span>}
+</code></pre>
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+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
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+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+  -->
+<p>To use this Apache Druid feature, make sure to only load <code>materialized-view-selection</code> on Broker and load <code>materialized-view-maintenance</code> on Overlord. In addition, this feature currently requires a Hadoop cluster.</p>
+<p>This feature enables Druid to greatly improve the query performance, especially when the query dataSource has a very large number of dimensions but the query only required several dimensions. This feature includes two parts. One is <code>materialized-view-maintenance</code>, and the other is <code>materialized-view-selection</code>.</p>
+<h2><a class="anchor" aria-hidden="true" id="materialized-view-maintenance"></a><a href="#materialized-view-maintenance" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Materialized-view-maintenance</h2>
+<p>In materialized-view-maintenance, dataSources user ingested are called &quot;base-dataSource&quot;. For each base-dataSource, we can submit <code>derivativeDataSource</code> supervisors to create and maintain other dataSources which we called  &quot;derived-dataSource&quot;. The dimensions and metrics of derived-dataSources are the subset of base-dataSource's.
+The <code>derivativeDataSource</code> supervisor is used to keep the timeline of derived-dataSource consistent with base-dataSource. Each <code>derivativeDataSource</code> supervisor  is responsible for one derived-dataSource.</p>
+<p>A sample derivativeDataSource supervisor spec is shown below:</p>
+<pre><code class="hljs css language-json">   {
+       <span class="hljs-attr">"type"</span>: <span class="hljs-string">"derivativeDataSource"</span>,
+       <span class="hljs-attr">"baseDataSource"</span>: <span class="hljs-string">"wikiticker"</span>,
+       <span class="hljs-attr">"dimensionsSpec"</span>: {
+           <span class="hljs-attr">"dimensions"</span>: [
+               <span class="hljs-string">"isUnpatrolled"</span>,
+               <span class="hljs-string">"metroCode"</span>,
+               <span class="hljs-string">"namespace"</span>,
+               <span class="hljs-string">"page"</span>,
+               <span class="hljs-string">"regionIsoCode"</span>,
+               <span class="hljs-string">"regionName"</span>,
+               <span class="hljs-string">"user"</span>
+           ]
+       },
+       <span class="hljs-attr">"metricsSpec"</span>: [
+           {
+               <span class="hljs-attr">"name"</span>: <span class="hljs-string">"count"</span>,
+               <span class="hljs-attr">"type"</span>: <span class="hljs-string">"count"</span>
+           },
+           {
+               <span class="hljs-attr">"name"</span>: <span class="hljs-string">"added"</span>,
+               <span class="hljs-attr">"type"</span>: <span class="hljs-string">"longSum"</span>,
+               <span class="hljs-attr">"fieldName"</span>: <span class="hljs-string">"added"</span>
+           }
+       ],
+       <span class="hljs-attr">"tuningConfig"</span>: {
+           <span class="hljs-attr">"type"</span>: <span class="hljs-string">"hadoop"</span>
+       }
+   }
+</code></pre>
+<p><strong>Supervisor Configuration</strong></p>
+<table>
+<thead>
+<tr><th>Field</th><th>Description</th><th>Required</th></tr>
+</thead>
+<tbody>
+<tr><td>Type</td><td>The supervisor type. This should always be <code>derivativeDataSource</code>.</td><td>yes</td></tr>
+<tr><td>baseDataSource</td><td>The name of base dataSource. This dataSource data should be already stored inside Druid, and the dataSource will be used as input data.</td><td>yes</td></tr>
+<tr><td>dimensionsSpec</td><td>Specifies the dimensions of the data. These dimensions must be the subset of baseDataSource's dimensions.</td><td>yes</td></tr>
+<tr><td>metricsSpec</td><td>A list of aggregators. These metrics must be the subset of baseDataSource's metrics. See <a href="/docs/0.20.0/querying/aggregations.html">aggregations</a>.</td><td>yes</td></tr>
+<tr><td>tuningConfig</td><td>TuningConfig must be HadoopTuningConfig. See <a href="../../ingestion/hadoop.html#tuningconfig">Hadoop tuning config</a>.</td><td>yes</td></tr>
+<tr><td>dataSource</td><td>The name of this derived dataSource.</td><td>no(default=baseDataSource-hashCode of supervisor)</td></tr>
+<tr><td>hadoopDependencyCoordinates</td><td>A JSON array of Hadoop dependency coordinates that Druid will use, this property will override the default Hadoop coordinates. Once specified, Druid will look for those Hadoop dependencies from the location specified by druid.extensions.hadoopDependenciesDir</td><td>no</td></tr>
+<tr><td>classpathPrefix</td><td>Classpath that will be prepended for the Peon process.</td><td>no</td></tr>
+<tr><td>context</td><td>See below.</td><td>no</td></tr>
+</tbody>
+</table>
+<p><strong>Context</strong></p>
+<table>
+<thead>
+<tr><th>Field</th><th>Description</th><th>Required</th></tr>
+</thead>
+<tbody>
+<tr><td>maxTaskCount</td><td>The max number of tasks the supervisor can submit simultaneously.</td><td>no(default=1)</td></tr>
+</tbody>
+</table>
+<h2><a class="anchor" aria-hidden="true" id="materialized-view-selection"></a><a href="#materialized-view-selection" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Materialized-view-selection</h2>
+<p>In materialized-view-selection, we implement a new query type <code>view</code>. When we request a view query, Druid will try its best to optimize the query based on query dataSource and intervals.</p>
+<p>A sample view query spec is shown below:</p>
+<pre><code class="hljs css language-json">   {
+       <span class="hljs-attr">"queryType"</span>: <span class="hljs-string">"view"</span>,
+       <span class="hljs-attr">"query"</span>: {
+           <span class="hljs-attr">"queryType"</span>: <span class="hljs-string">"groupBy"</span>,
+           <span class="hljs-attr">"dataSource"</span>: <span class="hljs-string">"wikiticker"</span>,
+           <span class="hljs-attr">"granularity"</span>: <span class="hljs-string">"all"</span>,
+           <span class="hljs-attr">"dimensions"</span>: [
+               <span class="hljs-string">"user"</span>
+           ],
+           <span class="hljs-attr">"limitSpec"</span>: {
+               <span class="hljs-attr">"type"</span>: <span class="hljs-string">"default"</span>,
+               <span class="hljs-attr">"limit"</span>: <span class="hljs-number">1</span>,
+               <span class="hljs-attr">"columns"</span>: [
+                   {
+                       <span class="hljs-attr">"dimension"</span>: <span class="hljs-string">"added"</span>,
+                       <span class="hljs-attr">"direction"</span>: <span class="hljs-string">"descending"</span>,
+                       <span class="hljs-attr">"dimensionOrder"</span>: <span class="hljs-string">"numeric"</span>
+                   }
+               ]
+           },
+           <span class="hljs-attr">"aggregations"</span>: [
+               {
+                   <span class="hljs-attr">"type"</span>: <span class="hljs-string">"longSum"</span>,
+                   <span class="hljs-attr">"name"</span>: <span class="hljs-string">"added"</span>,
+                   <span class="hljs-attr">"fieldName"</span>: <span class="hljs-string">"added"</span>
+               }
+           ],
+           <span class="hljs-attr">"intervals"</span>: [
+               <span class="hljs-string">"2015-09-12/2015-09-13"</span>
+           ]
+       }
+   }
+</code></pre>
+<p>There are 2 parts in a view query:</p>
+<table>
+<thead>
+<tr><th>Field</th><th>Description</th><th>Required</th></tr>
+</thead>
+<tbody>
+<tr><td>queryType</td><td>The query type. This should always be view</td><td>yes</td></tr>
+<tr><td>query</td><td>The real query of this <code>view</code> query. The real query must be <a href="/docs/0.20.0/querying/groupbyquery.html">groupBy</a>, <a href="/docs/0.20.0/querying/topnquery.html">topN</a>, or <a href="/docs/0.20.0/querying/timeseriesquery.html">timeseries</a> type.</td><td>yes</td></tr>
+</tbody>
+</table>
+<p><strong>Note that Materialized View is currently designated as experimental. Please make sure the time of all processes are the same and increase monotonically. Otherwise, some unexpected errors may happen on query results.</strong></p>
+</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/0.20.0/development/extensions-contrib/kafka-emitter.html"><span class="arrow-prev">← </span><span>Kafka Emitter</span></a><a class="docs-next button" href="/docs/0.20.0/development/extensions-contrib/momentsketch-quantiles.html"><span>Moment Sketches for Approximate Quantiles module</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#materialized-view-maintenance">Materialized-view-maintenance</a></li><li><a href="#materialized-view-selection">Materialized-view-selection</a></li></ul></nav></div><footer class="nav-footer druid-footer" id="footer"><div class="container"><div class="text-center"><p><a href="/technology">Technology</a> · <a href="/use-cases">Use Cases</a> · <a href="/druid-powered">Powered by Druid</a> · <a href="/docs/0.20.0/latest">Docs</a> · <a href="/community/">Community</a> · <a href="/downloads.html">Download</a> · <a href="/faq">FAQ</a></p></div><div class="text-center"><a title="Join the user group" href="https://groups.google.com/forum/#!forum/druid-user" target="_blank"><span class="fa fa-comments"></span></a> · <a title="Follow Druid" href="https://twitter.com/druidio" target="_blank"><span class="fab fa-twitter"></span></a> · <a title="Download via Apache" href="https://www.apache.org/dyn/closer.cgi?path=/incubator/druid/{{ site.druid_versions[0].versions[0].version }}/apache-druid-{{ site.druid_versions[0].versions[0].version }}-bin.tar.gz" target="_blank"><span class="fas fa-feather"></span></a> · <a title="GitHub" href="https://github.com/apache/druid" target="_blank"><span class="fab fa-github"></span></a></div><div class="text-center license">Copyright © 2019 <a href="https://www.apache.org/" target="_blank">Apache Software Foundation</a>.<br/>Except where otherwise noted, licensed under <a rel="license" href="http://creativecommons.org/licenses/by-sa/4.0/">CC BY-SA 4.0</a>.<br/>Apache Druid, Druid, and the Druid logo are either registered trademarks or trademarks of The Apache Software Foundation in the United States and other countries.</div></div></footer></div><script type="text/javascript" src="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.js"></script><script>
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+++ b/docs/0.20.0/development/extensions-contrib/momentsketch-quantiles.html
@@ -0,0 +1,182 @@
+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Moment Sketches for Approximate Quantiles module · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/0.20.0/development/extensions-contrib/momentsketch-quantiles.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.20.0" /><meta property="og:title" content="Moment Sketches for Approximate Quantiles module · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
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+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
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+  ~ to you under the Apache License, Version 2.0 (the
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+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+  -->
+<p>This module provides aggregators for approximate quantile queries using the <a href="https://github.com/stanford-futuredata/momentsketch">momentsketch</a> library.
+The momentsketch provides coarse quantile estimates with less space and aggregation time overheads than traditional sketches, approaching the performance of counts and sums by reconstructing distributions from computed statistics.</p>
+<p>To use this Apache Druid extension, make sure you <a href="/docs/0.20.0/development/extensions.html#loading-extensions">include</a> the extension in your config file:</p>
+<pre><code class="hljs"><span class="hljs-attr">druid.extensions.loadList</span>=[<span class="hljs-string">"druid-momentsketch"</span>]
+</code></pre>
+<h3><a class="anchor" aria-hidden="true" id="aggregator"></a><a href="#aggregator" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Aggregator</h3>
+<p>The result of the aggregation is a momentsketch that is the union of all sketches either built from raw data or read from the segments.</p>
+<p>The <code>momentSketch</code> aggregator operates over raw data while the <code>momentSketchMerge</code> aggregator should be used when aggregating precomputed sketches.</p>
+<pre><code class="hljs css language-json">{
+  <span class="hljs-attr">"type"</span> : &lt;aggregator_type&gt;,
+  <span class="hljs-attr">"name"</span> : &lt;output_name&gt;,
+  <span class="hljs-attr">"fieldName"</span> : &lt;input_name&gt;,
+  <span class="hljs-attr">"k"</span> : &lt;int&gt;,
+  <span class="hljs-attr">"compress"</span> : &lt;boolean&gt;
+ }
+</code></pre>
+<table>
+<thead>
+<tr><th>property</th><th>description</th><th>required?</th></tr>
+</thead>
+<tbody>
+<tr><td>type</td><td>Type of aggregator desired. Either &quot;momentSketch&quot; or &quot;momentSketchMerge&quot;</td><td>yes</td></tr>
+<tr><td>name</td><td>A String for the output (result) name of the calculation.</td><td>yes</td></tr>
+<tr><td>fieldName</td><td>A String for the name of the input field (can contain sketches or raw numeric values).</td><td>yes</td></tr>
+<tr><td>k</td><td>Parameter that determines the accuracy and size of the sketch. Higher k means higher accuracy but more space to store sketches. Usable range is generally [3,15]</td><td>no, defaults to 13.</td></tr>
+<tr><td>compress</td><td>Flag for whether the aggregator compresses numeric values using arcsinh. Can improve robustness to skewed and long-tailed distributions, but reduces accuracy slightly on more uniform distributions.</td><td>no, defaults to true</td></tr>
+</tbody>
+</table>
+<h3><a class="anchor" aria-hidden="true" id="post-aggregators"></a><a href="#post-aggregators" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Post Aggregators</h3>
+<p>Users can query for a set of quantiles using the <code>momentSketchSolveQuantiles</code> post-aggregator on the sketches created by the <code>momentSketch</code> or <code>momentSketchMerge</code> aggregators.</p>
+<pre><code class="hljs css language-json">{
+  <span class="hljs-attr">"type"</span>  : <span class="hljs-string">"momentSketchSolveQuantiles"</span>,
+  <span class="hljs-attr">"name"</span> : &lt;output_name&gt;,
+  <span class="hljs-attr">"field"</span> : &lt;reference to moment sketch&gt;,
+  <span class="hljs-attr">"fractions"</span> : &lt;array of doubles in [<span class="hljs-number">0</span>,<span class="hljs-number">1</span>]&gt;
+}
+</code></pre>
+<p>Users can also query for the min/max of a distribution:</p>
+<pre><code class="hljs css language-json">{
+  <span class="hljs-attr">"type"</span> : <span class="hljs-string">"momentSketchMin"</span> | <span class="hljs-string">"momentSketchMax"</span>,
+  <span class="hljs-attr">"name"</span> : &lt;output_name&gt;,
+  <span class="hljs-attr">"field"</span> : &lt;reference to moment sketch&gt;,
+}
+</code></pre>
+<h3><a class="anchor" aria-hidden="true" id="example"></a><a href="#example" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Example</h3>
+<p>As an example of a query with sketches pre-aggregated at ingestion time, one could set up the following aggregator at ingest:</p>
+<pre><code class="hljs css language-json">{
+  <span class="hljs-attr">"type"</span>: <span class="hljs-string">"momentSketch"</span>,
+  <span class="hljs-attr">"name"</span>: <span class="hljs-string">"sketch"</span>,
+  <span class="hljs-attr">"fieldName"</span>: <span class="hljs-string">"value"</span>,
+  <span class="hljs-attr">"k"</span>: <span class="hljs-number">10</span>,
+  <span class="hljs-attr">"compress"</span>: <span class="hljs-literal">true</span>,
+}
+</code></pre>
+<p>and make queries using the following aggregator + post-aggregator:</p>
+<pre><code class="hljs css language-json">{
+  <span class="hljs-attr">"aggregations"</span>: [{
+    <span class="hljs-attr">"type"</span>: <span class="hljs-string">"momentSketchMerge"</span>,
+    <span class="hljs-attr">"name"</span>: <span class="hljs-string">"sketch"</span>,
+    <span class="hljs-attr">"fieldName"</span>: <span class="hljs-string">"sketch"</span>,
+    <span class="hljs-attr">"k"</span>: <span class="hljs-number">10</span>,
+    <span class="hljs-attr">"compress"</span>: <span class="hljs-literal">true</span>
+  }],
+  <span class="hljs-attr">"postAggregations"</span>: [
+  {
+    <span class="hljs-attr">"type"</span>: <span class="hljs-string">"momentSketchSolveQuantiles"</span>,
+    <span class="hljs-attr">"name"</span>: <span class="hljs-string">"quantiles"</span>,
+    <span class="hljs-attr">"fractions"</span>: [<span class="hljs-number">0.1</span>, <span class="hljs-number">0.5</span>, <span class="hljs-number">0.9</span>],
+    <span class="hljs-attr">"field"</span>: {
+      <span class="hljs-attr">"type"</span>: <span class="hljs-string">"fieldAccess"</span>,
+      <span class="hljs-attr">"fieldName"</span>: <span class="hljs-string">"sketch"</span>
+    }
+  },
+  {
+    <span class="hljs-attr">"type"</span>: <span class="hljs-string">"momentSketchMin"</span>,
+    <span class="hljs-attr">"name"</span>: <span class="hljs-string">"min"</span>,
+    <span class="hljs-attr">"field"</span>: {
+      <span class="hljs-attr">"type"</span>: <span class="hljs-string">"fieldAccess"</span>,
+      <span class="hljs-attr">"fieldName"</span>: <span class="hljs-string">"sketch"</span>
+    }
+  }]
+}
+</code></pre>
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+<h2><a class="anchor" aria-hidden="true" id="overview"></a><a href="#overview" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Overview</h2>
+<p><strong>Moving Average Query</strong> is an extension which provides support for <a href="https://en.wikipedia.org/wiki/Moving_average">Moving Average</a> and other Aggregate <a href="https://en.wikibooks.org/wiki/Structured_Query_Language/Window_functions">Window Functions</a> in Druid queries.</p>
+<p>These Aggregate Window Functions consume standard Druid Aggregators and outputs additional windowed aggregates called <a href="#averagers">Averagers</a>.</p>
+<h4><a class="anchor" aria-hidden="true" id="high-level-algorithm"></a><a href="#high-level-algorithm" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>High level algorithm</h4>
+<p>Moving Average encapsulates the <a href="/docs/0.20.0/querying/groupbyquery.html">groupBy query</a> (Or <a href="/docs/0.20.0/querying/timeseriesquery.html">timeseries</a> in case of no dimensions) in order to rely on the maturity of these query types.</p>
+<p>It runs the query in two main phases:</p>
+<ol>
+<li>Runs an inner <a href="../../querying/groupbyquery.html">groupBy</a> or <a href="../../querying/timeseriesquery.html">timeseries</a> query to compute Aggregators (i.e. daily count of events).</li>
+<li>Passes over aggregated results in Broker, in order to compute Averagers (i.e. moving 7 day average of the daily count).</li>
+</ol>
+<h4><a class="anchor" aria-hidden="true" id="main-enhancements-provided-by-this-extension"></a><a href="#main-enhancements-provided-by-this-extension" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Main enhancements provided by this extension:</h4>
+<ol>
+<li>Functionality: Extending druid query functionality (i.e. initial introduction of Window Functions).</li>
+<li>Performance: Improving performance of such moving aggregations by eliminating multiple segment scans.</li>
+</ol>
+<h4><a class="anchor" aria-hidden="true" id="further-reading"></a><a href="#further-reading" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Further reading</h4>
+<p><a href="https://en.wikipedia.org/wiki/Moving_average">Moving Average</a></p>
+<p><a href="https://en.wikibooks.org/wiki/Structured_Query_Language/Window_functions">Window Functions</a></p>
+<p><a href="https://cloud.google.com/bigquery/docs/reference/standard-sql/analytic-function-concepts">Analytic Functions</a></p>
+<h2><a class="anchor" aria-hidden="true" id="operations"></a><a href="#operations" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Operations</h2>
+<p>To use this extension, make sure to <a href="/docs/0.20.0/development/extensions.html#loading-extensions">load</a> <code>druid-moving-average-query</code> only to the Broker.</p>
+<h2><a class="anchor" aria-hidden="true" id="configuration"></a><a href="#configuration" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Configuration</h2>
+<p>There are currently no configuration properties specific to Moving Average.</p>
+<h2><a class="anchor" aria-hidden="true" id="limitations"></a><a href="#limitations" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Limitations</h2>
+<ul>
+<li>movingAverage is missing support for the following groupBy properties: <code>subtotalsSpec</code>, <code>virtualColumns</code>.</li>
+<li>movingAverage is missing support for the following timeseries properties: <code>descending</code>.</li>
+<li>movingAverage is missing support for <a href="https://github.com/apache/druid/issues/4349">SQL-compatible null handling</a> (So setting druid.generic.useDefaultValueForNull in configuration will give an error).</li>
+</ul>
+<p>##Query spec:</p>
+<ul>
+<li>Most properties in the query spec derived from  <a href="/docs/0.20.0/querying/groupbyquery.html">groupBy query</a> / <a href="/docs/0.20.0/querying/timeseriesquery.html">timeseries</a>, see documentation for these query types.</li>
+</ul>
+<table>
+<thead>
+<tr><th>property</th><th>description</th><th>required?</th></tr>
+</thead>
+<tbody>
+<tr><td>queryType</td><td>This String should always be &quot;movingAverage&quot;; this is the first thing Druid looks at to figure out how to interpret the query.</td><td>yes</td></tr>
+<tr><td>dataSource</td><td>A String or Object defining the data source to query, very similar to a table in a relational database. See <a href="/docs/0.20.0/querying/datasource.html">DataSource</a> for more information.</td><td>yes</td></tr>
+<tr><td>dimensions</td><td>A JSON list of <a href="/docs/0.20.0/querying/dimensionspecs.html">DimensionSpec</a> (Notice that property is optional)</td><td>no</td></tr>
+<tr><td>limitSpec</td><td>See <a href="/docs/0.20.0/querying/limitspec.html">LimitSpec</a></td><td>no</td></tr>
+<tr><td>having</td><td>See <a href="/docs/0.20.0/querying/having.html">Having</a></td><td>no</td></tr>
+<tr><td>granularity</td><td>A period granularity; See <a href="../../querying/granularities.html#period-granularities">Period Granularities</a></td><td>yes</td></tr>
+<tr><td>filter</td><td>See <a href="/docs/0.20.0/querying/filters.html">Filters</a></td><td>no</td></tr>
+<tr><td>aggregations</td><td>Aggregations forms the input to Averagers; See <a href="/docs/0.20.0/querying/aggregations.html">Aggregations</a></td><td>yes</td></tr>
+<tr><td>postAggregations</td><td>Supports only aggregations as input; See <a href="/docs/0.20.0/querying/post-aggregations.html">Post Aggregations</a></td><td>no</td></tr>
+<tr><td>intervals</td><td>A JSON Object representing ISO-8601 Intervals. This defines the time ranges to run the query over.</td><td>yes</td></tr>
+<tr><td>context</td><td>An additional JSON Object which can be used to specify certain flags.</td><td>no</td></tr>
+<tr><td>averagers</td><td>Defines the moving average function; See <a href="#averagers">Averagers</a></td><td>yes</td></tr>
+<tr><td>postAveragers</td><td>Support input of both averagers and aggregations; Syntax is identical to postAggregations (See <a href="/docs/0.20.0/querying/post-aggregations.html">Post Aggregations</a>)</td><td>no</td></tr>
+</tbody>
+</table>
+<h2><a class="anchor" aria-hidden="true" id="averagers"></a><a href="#averagers" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Averagers</h2>
+<p>Averagers are used to define the Moving-Average function. Averagers are not limited to an average - they can also provide other types of window functions such as MAX()/MIN().</p>
+<h3><a class="anchor" aria-hidden="true" id="properties"></a><a href="#properties" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Properties</h3>
+<p>These are properties which are common to all Averagers:</p>
+<table>
+<thead>
+<tr><th>property</th><th>description</th><th>required?</th></tr>
+</thead>
+<tbody>
+<tr><td>type</td><td>Averager type; See <a href="#averager-types">Averager types</a></td><td>yes</td></tr>
+<tr><td>name</td><td>Averager name</td><td>yes</td></tr>
+<tr><td>fieldName</td><td>Input name (An aggregation name)</td><td>yes</td></tr>
+<tr><td>buckets</td><td>Number of lookback buckets (time periods), including current one. Must be &gt;0</td><td>yes</td></tr>
+<tr><td>cycleSize</td><td>Cycle size; Used to calculate day-of-week option; See <a href="#cycle-size-day-of-week">Cycle size (Day of Week)</a></td><td>no, defaults to 1</td></tr>
+</tbody>
+</table>
+<h3><a class="anchor" aria-hidden="true" id="averager-types"></a><a href="#averager-types" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Averager types:</h3>
+<ul>
+<li><a href="#standard-averagers">Standard averagers</a>:
+<ul>
+<li>doubleMean</li>
+<li>doubleMeanNoNulls</li>
+<li>doubleSum</li>
+<li>doubleMax</li>
+<li>doubleMin</li>
+<li>longMean</li>
+<li>longMeanNoNulls</li>
+<li>longSum</li>
+<li>longMax</li>
+<li>longMin</li>
+</ul></li>
+</ul>
+<h4><a class="anchor" aria-hidden="true" id="standard-averagers"></a><a href="#standard-averagers" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Standard averagers</h4>
+<p>These averagers offer four functions:</p>
+<ul>
+<li>Mean (Average)</li>
+<li>MeanNoNulls (Ignores empty buckets).</li>
+<li>Sum</li>
+<li>Max</li>
+<li>Min</li>
+</ul>
+<p><strong>Ignoring nulls</strong>:
+Using a MeanNoNulls averager is useful when the interval starts at the dataset beginning time.
+In that case, the first records will ignore missing buckets and average won't be artificially low.
+However, this also means that empty days in a sparse dataset will also be ignored.</p>
+<p>Example of usage:</p>
+<pre><code class="hljs css language-json">{ <span class="hljs-attr">"type"</span> : <span class="hljs-string">"doubleMean"</span>, <span class="hljs-attr">"name"</span> : &lt;output_name&gt;, <span class="hljs-attr">"fieldName"</span>: &lt;input_name&gt; }
+</code></pre>
+<h3><a class="anchor" aria-hidden="true" id="cycle-size-day-of-week"></a><a href="#cycle-size-day-of-week" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Cycle size (Day of Week)</h3>
+<p>This optional parameter is used to calculate over a single bucket within each cycle instead of all buckets.
+A prime example would be weekly buckets, resulting in a Day of Week calculation. (Other examples: Month of year, Hour of day).</p>
+<p>I.e. when using these parameters:</p>
+<ul>
+<li><em>granularity</em>: period=P1D (daily)</li>
+<li><em>buckets</em>: 28</li>
+<li><em>cycleSize</em>: 7</li>
+</ul>
+<p>Within each output record, the averager will compute the result over the following buckets: current (#0), #7, #14, #21.
+Whereas without specifying cycleSize it would have computed over all 28 buckets.</p>
+<h2><a class="anchor" aria-hidden="true" id="examples"></a><a href="#examples" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Examples</h2>
+<p>All examples are based on the Wikipedia dataset provided in the Druid <a href="/docs/0.20.0/tutorials/index.html">tutorials</a>.</p>
+<h3><a class="anchor" aria-hidden="true" id="basic-example"></a><a href="#basic-example" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Basic example</h3>
+<p>Calculating a 7-buckets moving average for Wikipedia edit deltas.</p>
+<p>Query syntax:</p>
+<pre><code class="hljs css language-json">{
+  <span class="hljs-attr">"queryType"</span>: <span class="hljs-string">"movingAverage"</span>,
+  <span class="hljs-attr">"dataSource"</span>: <span class="hljs-string">"wikipedia"</span>,
+  <span class="hljs-attr">"granularity"</span>: {
+    <span class="hljs-attr">"type"</span>: <span class="hljs-string">"period"</span>,
+    <span class="hljs-attr">"period"</span>: <span class="hljs-string">"PT30M"</span>
+  },
+  <span class="hljs-attr">"intervals"</span>: [
+    <span class="hljs-string">"2015-09-12T00:00:00Z/2015-09-13T00:00:00Z"</span>
+  ],
+  <span class="hljs-attr">"aggregations"</span>: [
+    {
+      <span class="hljs-attr">"name"</span>: <span class="hljs-string">"delta30Min"</span>,
+      <span class="hljs-attr">"fieldName"</span>: <span class="hljs-string">"delta"</span>,
+      <span class="hljs-attr">"type"</span>: <span class="hljs-string">"longSum"</span>
+    }
+  ],
+  <span class="hljs-attr">"averagers"</span>: [
+    {
+      <span class="hljs-attr">"name"</span>: <span class="hljs-string">"trailing30MinChanges"</span>,
+      <span class="hljs-attr">"fieldName"</span>: <span class="hljs-string">"delta30Min"</span>,
+      <span class="hljs-attr">"type"</span>: <span class="hljs-string">"longMean"</span>,
+      <span class="hljs-attr">"buckets"</span>: <span class="hljs-number">7</span>
+    }
+  ]
+}
+</code></pre>
+<p>Result:</p>
+<pre><code class="hljs css language-json">[ {
+   "version" : "v1",
+   "timestamp" : "2015-09-12T00:30:00.000Z",
+   "event" : {
+     "delta30Min" : 30490,
+     "trailing30MinChanges" : 4355.714285714285
+   }
+ }, {
+   "version" : "v1",
+   "timestamp" : "2015-09-12T01:00:00.000Z",
+   "event" : {
+     "delta30Min" : 96526,
+     "trailing30MinChanges" : 18145.14285714286
+   }
+ }, {
+...
+...
+...
+}, {
+  "version" : "v1",
+  "timestamp" : "2015-09-12T23:00:00.000Z",
+  "event" : {
+    "delta30Min" : 119100,
+    "trailing30MinChanges" : 198697.2857142857
+  }
+}, {
+  "version" : "v1",
+  "timestamp" : "2015-09-12T23:30:00.000Z",
+  "event" : {
+    "delta30Min" : 177882,
+    "trailing30MinChanges" : 193890.0
+  }
+}
+</code></pre>
+<h3><a class="anchor" aria-hidden="true" id="post-averager-example"></a><a href="#post-averager-example" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Post averager example</h3>
+<p>Calculating a 7-buckets moving average for Wikipedia edit deltas, plus a ratio between the current period and the moving average.</p>
+<p>Query syntax:</p>
+<pre><code class="hljs css language-json">{
+  <span class="hljs-attr">"queryType"</span>: <span class="hljs-string">"movingAverage"</span>,
+  <span class="hljs-attr">"dataSource"</span>: <span class="hljs-string">"wikipedia"</span>,
+  <span class="hljs-attr">"granularity"</span>: {
+    <span class="hljs-attr">"type"</span>: <span class="hljs-string">"period"</span>,
+    <span class="hljs-attr">"period"</span>: <span class="hljs-string">"PT30M"</span>
+  },
+  <span class="hljs-attr">"intervals"</span>: [
+    <span class="hljs-string">"2015-09-12T22:00:00Z/2015-09-13T00:00:00Z"</span>
+  ],
+  <span class="hljs-attr">"aggregations"</span>: [
+    {
+      <span class="hljs-attr">"name"</span>: <span class="hljs-string">"delta30Min"</span>,
+      <span class="hljs-attr">"fieldName"</span>: <span class="hljs-string">"delta"</span>,
+      <span class="hljs-attr">"type"</span>: <span class="hljs-string">"longSum"</span>
+    }
+  ],
+  <span class="hljs-attr">"averagers"</span>: [
+    {
+      <span class="hljs-attr">"name"</span>: <span class="hljs-string">"trailing30MinChanges"</span>,
+      <span class="hljs-attr">"fieldName"</span>: <span class="hljs-string">"delta30Min"</span>,
+      <span class="hljs-attr">"type"</span>: <span class="hljs-string">"longMean"</span>,
+      <span class="hljs-attr">"buckets"</span>: <span class="hljs-number">7</span>
+    }
+  ],
+  <span class="hljs-attr">"postAveragers"</span> : [
+    {
+      <span class="hljs-attr">"name"</span>: <span class="hljs-string">"ratioTrailing30MinChanges"</span>,
+      <span class="hljs-attr">"type"</span>: <span class="hljs-string">"arithmetic"</span>,
+      <span class="hljs-attr">"fn"</span>: <span class="hljs-string">"/"</span>,
+      <span class="hljs-attr">"fields"</span>: [
+        {
+          <span class="hljs-attr">"type"</span>: <span class="hljs-string">"fieldAccess"</span>,
+          <span class="hljs-attr">"fieldName"</span>: <span class="hljs-string">"delta30Min"</span>
+        },
+        {
+          <span class="hljs-attr">"type"</span>: <span class="hljs-string">"fieldAccess"</span>,
+          <span class="hljs-attr">"fieldName"</span>: <span class="hljs-string">"trailing30MinChanges"</span>
+        }
+      ]
+    }
+  ]
+}
+</code></pre>
+<p>Result:</p>
+<pre><code class="hljs css language-json">[ {
+  <span class="hljs-attr">"version"</span> : <span class="hljs-string">"v1"</span>,
+  <span class="hljs-attr">"timestamp"</span> : <span class="hljs-string">"2015-09-12T22:00:00.000Z"</span>,
+  <span class="hljs-attr">"event"</span> : {
+    <span class="hljs-attr">"delta30Min"</span> : <span class="hljs-number">144269</span>,
+    <span class="hljs-attr">"trailing30MinChanges"</span> : <span class="hljs-number">204088.14285714287</span>,
+    <span class="hljs-attr">"ratioTrailing30MinChanges"</span> : <span class="hljs-number">0.7068955500319539</span>
+  }
+}, {
+  <span class="hljs-attr">"version"</span> : <span class="hljs-string">"v1"</span>,
+  <span class="hljs-attr">"timestamp"</span> : <span class="hljs-string">"2015-09-12T22:30:00.000Z"</span>,
+  <span class="hljs-attr">"event"</span> : {
+    <span class="hljs-attr">"delta30Min"</span> : <span class="hljs-number">242860</span>,
+    <span class="hljs-attr">"trailing30MinChanges"</span> : <span class="hljs-number">214031.57142857142</span>,
+    <span class="hljs-attr">"ratioTrailing30MinChanges"</span> : <span class="hljs-number">1.134692411867141</span>
+  }
+}, {
+  <span class="hljs-attr">"version"</span> : <span class="hljs-string">"v1"</span>,
+  <span class="hljs-attr">"timestamp"</span> : <span class="hljs-string">"2015-09-12T23:00:00.000Z"</span>,
+  <span class="hljs-attr">"event"</span> : {
+    <span class="hljs-attr">"delta30Min"</span> : <span class="hljs-number">119100</span>,
+    <span class="hljs-attr">"trailing30MinChanges"</span> : <span class="hljs-number">198697.2857142857</span>,
+    <span class="hljs-attr">"ratioTrailing30MinChanges"</span> : <span class="hljs-number">0.5994042624782422</span>
+  }
+}, {
+  <span class="hljs-attr">"version"</span> : <span class="hljs-string">"v1"</span>,
+  <span class="hljs-attr">"timestamp"</span> : <span class="hljs-string">"2015-09-12T23:30:00.000Z"</span>,
+  <span class="hljs-attr">"event"</span> : {
+    <span class="hljs-attr">"delta30Min"</span> : <span class="hljs-number">177882</span>,
+    <span class="hljs-attr">"trailing30MinChanges"</span> : <span class="hljs-number">193890.0</span>,
+    <span class="hljs-attr">"ratioTrailing30MinChanges"</span> : <span class="hljs-number">0.9174377224199288</span>
+  }
+} ]
+</code></pre>
+<h3><a class="anchor" aria-hidden="true" id="cycle-size-example"></a><a href="#cycle-size-example" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Cycle size example</h3>
+<p>Calculating an average of every first 10-minutes of the last 3 hours:</p>
+<p>Query syntax:</p>
+<pre><code class="hljs css language-json">{
+  <span class="hljs-attr">"queryType"</span>: <span class="hljs-string">"movingAverage"</span>,
+  <span class="hljs-attr">"dataSource"</span>: <span class="hljs-string">"wikipedia"</span>,
+  <span class="hljs-attr">"granularity"</span>: {
+    <span class="hljs-attr">"type"</span>: <span class="hljs-string">"period"</span>,
+    <span class="hljs-attr">"period"</span>: <span class="hljs-string">"PT10M"</span>
+  },
+  <span class="hljs-attr">"intervals"</span>: [
+    <span class="hljs-string">"2015-09-12T00:00:00Z/2015-09-13T00:00:00Z"</span>
+  ],
+  <span class="hljs-attr">"aggregations"</span>: [
+    {
+      <span class="hljs-attr">"name"</span>: <span class="hljs-string">"delta10Min"</span>,
+      <span class="hljs-attr">"fieldName"</span>: <span class="hljs-string">"delta"</span>,
+      <span class="hljs-attr">"type"</span>: <span class="hljs-string">"doubleSum"</span>
+    }
+  ],
+  <span class="hljs-attr">"averagers"</span>: [
+    {
+      <span class="hljs-attr">"name"</span>: <span class="hljs-string">"trailing10MinPerHourChanges"</span>,
+      <span class="hljs-attr">"fieldName"</span>: <span class="hljs-string">"delta10Min"</span>,
+      <span class="hljs-attr">"type"</span>: <span class="hljs-string">"doubleMeanNoNulls"</span>,
+      <span class="hljs-attr">"buckets"</span>: <span class="hljs-number">18</span>,
+      <span class="hljs-attr">"cycleSize"</span>: <span class="hljs-number">6</span>
+    }
+  ]
+}
+</code></pre>
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+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
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+<p>To use this Apache Druid extension, make sure to <a href="/docs/0.20.0/development/extensions.html#loading-extensions">include</a> <code>opentsdb-emitter</code> extension.</p>
+<h2><a class="anchor" aria-hidden="true" id="introduction"></a><a href="#introduction" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Introduction</h2>
+<p>This extension emits druid metrics to <a href="https://github.com/OpenTSDB/opentsdb">OpenTSDB</a> over HTTP (Using <code>Jersey client</code>). And this emitter only emits service metric events to OpenTSDB (See <a href="/docs/0.20.0/operations/metrics.html">Druid metrics</a> for a list of metrics).</p>
+<h2><a class="anchor" aria-hidden="true" id="configuration"></a><a href="#configuration" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Configuration</h2>
+<p>All the configuration parameters for the OpenTSDB emitter are under <code>druid.emitter.opentsdb</code>.</p>
+<table>
+<thead>
+<tr><th>property</th><th>description</th><th>required?</th><th>default</th></tr>
+</thead>
+<tbody>
+<tr><td><code>druid.emitter.opentsdb.host</code></td><td>The host of the OpenTSDB server.</td><td>yes</td><td>none</td></tr>
+<tr><td><code>druid.emitter.opentsdb.port</code></td><td>The port of the OpenTSDB server.</td><td>yes</td><td>none</td></tr>
+<tr><td><code>druid.emitter.opentsdb.connectionTimeout</code></td><td><code>Jersey client</code> connection timeout(in milliseconds).</td><td>no</td><td>2000</td></tr>
+<tr><td><code>druid.emitter.opentsdb.readTimeout</code></td><td><code>Jersey client</code> read timeout(in milliseconds).</td><td>no</td><td>2000</td></tr>
+<tr><td><code>druid.emitter.opentsdb.flushThreshold</code></td><td>Queue flushing threshold.(Events will be sent as one batch)</td><td>no</td><td>100</td></tr>
+<tr><td><code>druid.emitter.opentsdb.maxQueueSize</code></td><td>Maximum size of the queue used to buffer events.</td><td>no</td><td>1000</td></tr>
+<tr><td><code>druid.emitter.opentsdb.consumeDelay</code></td><td>Queue consuming delay(in milliseconds). Actually, we use <code>ScheduledExecutorService</code> to schedule consuming events, so this <code>consumeDelay</code> means the delay between the termination of one execution and the commencement of the next. If your druid processes produce metric events fast, then you should decrease this <code>consumeDelay</code> or increase the <code>maxQueueSize</code>.</td><td>no</td><td>10000</td></tr>
+<tr><td><code>druid.emitter.opentsdb.metricMapPath</code></td><td>JSON file defining the desired metrics and dimensions for every Druid metric</td><td>no</td><td>./src/main/resources/defaultMetrics.json</td></tr>
+<tr><td><code>druid.emitter.opentsdb.namespacePrefix</code></td><td>Optional (string) prefix for metric names, for example the default metric name <code>query.count</code> with a namespacePrefix set to <code>druid</code> would be emitted as <code>druid.query.count</code></td><td>no</td><td>null</td></tr>
+</tbody>
+</table>
+<h3><a class="anchor" aria-hidden="true" id="druid-to-opentsdb-event-converter"></a><a href="#druid-to-opentsdb-event-converter" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Druid to OpenTSDB Event Converter</h3>
+<p>The OpenTSDB emitter will send only the desired metrics and dimensions which is defined in a JSON file.
+If the user does not specify their own JSON file, a default file is used.  All metrics are expected to be configured in the JSON file. Metrics which are not configured will be logged.
+Desired metrics and dimensions is organized using the following schema:<code>&lt;druid metric name&gt; : [ &lt;dimension list&gt; ]</code><br />
+e.g.</p>
+<pre><code class="hljs css language-json">"query/time": [
+    "dataSource",
+    "type"
+]
+</code></pre>
+<p>For most use-cases, the default configuration is sufficient.</p>
+</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/0.20.0/development/extensions-contrib/moving-average-query.html"><span class="arrow-prev">← </span><span>Moving Average Query</span></a><a class="docs-next button" href="/docs/0.20.0/development/extensions-contrib/redis-cache.html"><span>Druid Redis Cache</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#introduction">Introduction</a></li><li><a href="#configuration">Configuration</a><ul class="toc-headings"><li><a href="#druid-to-opentsdb-event-converter">Druid to OpenTSDB Event Converter</a></li></ul></li></ul></nav></div><footer class="nav-footer druid-footer" id="footer"><div class="container"><div class="text-center"><p><a href="/technology">Technology</a> · <a href="/use-cases">Use Cases</a> · <a href="/druid-powered">Powered by Druid</a> · <a href="/docs/0.20.0/latest">Docs</a> · <a href="/community/">Community</a> · <a href="/downloads.html">Download</a> · <a href="/faq">FAQ</a></p></div><div class="text-center"><a title="Join the user group" href="https://groups.google.com/forum/#!forum/druid-user" target="_blank"><span class="fa fa-comments"></span></a> · <a title="Follow Druid" href="https://twitter.com/druidio" target="_blank"><span class="fab fa-twitter"></span></a> · <a title="Download via Apache" href="https://www.apache.org/dyn/closer.cgi?path=/incubator/druid/{{ site.druid_versions[0].versions[0].version }}/apache-druid-{{ site.druid_versions[0].versions[0].version }}-bin.tar.gz" target="_blank"><span class="fas fa-feather"></span></a> · <a title="GitHub" href="https://github.com/apache/druid" target="_blank"><span class="fab fa-github"></span></a></div><div class="text-center license">Copyright © 2019 <a href="https://www.apache.org/" target="_blank">Apache Software Foundation</a>.<br/>Except where otherwise noted, licensed under <a rel="license" href="http://creativecommons.org/licenses/by-sa/4.0/">CC BY-SA 4.0</a>.<br/>Apache Druid, Druid, and the Druid logo are either registered trademarks or trademarks of The Apache Software Foundation in the United States and other countries.</div></div></footer></div><script type="text/javascript" src="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.js"></script><script>
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+        </script></nav></div><div class="container mainContainer docsContainer"><div class="wrapper"><div class="post"><header class="postHeader"><a class="edit-page-link button" href="https://github.com/apache/druid/edit/master/docs/development/extensions-contrib/redis-cache.md" target="_blank" rel="noreferrer noopener">Edit</a><h1 id="__docusaurus" class="postHeaderTitle">Druid Redis Cache</h1></header><article><div><span><!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+  -->
+<p>A cache implementation for Druid based on <a href="https://github.com/redis/redis">Redis</a>.</p>
+<p>Below are guidance and configuration options known to this module.</p>
+<h2><a class="anchor" aria-hidden="true" id="installation"></a><a href="#installation" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Installation</h2>
+<p>Use <a href="/docs/0.20.0/operations/pull-deps.html">pull-deps</a> tool shipped with Druid to install this <a href="/docs/0.20.0/development/extensions.html#community-extensions">extension</a> on broker, historical and middle manager nodes.</p>
+<pre><code class="hljs css language-bash">java -classpath <span class="hljs-string">"druid_dir/lib/*"</span> org.apache.druid.cli.Main tools pull-deps -c org.apache.druid.extensions.contrib:druid-redis-cache:{VERSION}
+</code></pre>
+<h2><a class="anchor" aria-hidden="true" id="enabling"></a><a href="#enabling" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Enabling</h2>
+<p>To enable this extension after installation,</p>
+<ol>
+<li><a href="/docs/0.20.0/development/extensions.html#loading-extensions">include</a> this <code>druid-redis-cache</code> extension</li>
+<li>to enable cache on broker nodes, follow <a href="../../configuration/index.html#broker-caching">broker caching docs</a> to set related properties</li>
+<li>to enable cache on historical nodes, follow <a href="../../configuration/index.html#historical-caching">historical caching docs</a> to set related properties</li>
+<li>to enable cache on middle manager nodes, follow <a href="../../configuration/index.html#peon-caching">peon caching docs</a> to set related properties</li>
+<li>set <code>druid.cache.type</code> to <code>redis</code></li>
+<li>add the following properties</li>
+</ol>
+<h2><a class="anchor" aria-hidden="true" id="configuration"></a><a href="#configuration" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Configuration</h2>
+<h3><a class="anchor" aria-hidden="true" id="cluster-mode"></a><a href="#cluster-mode" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Cluster mode</h3>
+<p>To utilize a redis cluster, following properties must be set.</p>
+<p>Note: some redis cloud service providers provide redis cluster service via a redis proxy, for these clusters, please follow the <a href="#standalone-mode">Standalone mode</a> configuration below.</p>
+<table>
+<thead>
+<tr><th>Properties</th><th>Description</th><th>Default</th><th>Required</th></tr>
+</thead>
+<tbody>
+<tr><td><code>druid.cache.cluster.nodes</code></td><td>Redis nodes in a cluster, represented in comma separated string. See example below</td><td>None</td><td>yes</td></tr>
+<tr><td><code>druid.cache.cluster.maxRedirection</code></td><td>Max retry count</td><td>5</td><td>no</td></tr>
+</tbody>
+</table>
+<h4><a class="anchor" aria-hidden="true" id="example"></a><a href="#example" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Example</h4>
+<pre><code class="hljs css language-properties"><span class="hljs-comment"># a typical redis cluster with 6 nodes</span>
+<span class="hljs-meta">druid.cache.cluster.nodes</span>=<span class="hljs-string">127.0.0.1:7001,127.0.0.1:7002,127.0.0.1:7003,127.0.0.1:7004,127.0.0.1:7005,127.0.0.1:7006</span>
+</code></pre>
+<h3><a class="anchor" aria-hidden="true" id="standalone-mode"></a><a href="#standalone-mode" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Standalone mode</h3>
+<p>To use a standalone redis, following properties must be set.</p>
+<table>
+<thead>
+<tr><th>Properties</th><th>Description</th><th>Default</th><th>Required</th></tr>
+</thead>
+<tbody>
+<tr><td><code>druid.cache.host</code></td><td>Redis server host</td><td>None</td><td>yes</td></tr>
+<tr><td><code>druid.cache.port</code></td><td>Redis server port</td><td>None</td><td>yes</td></tr>
+<tr><td><code>druid.cache.database</code></td><td>Redis database index</td><td>0</td><td>no</td></tr>
+</tbody>
+</table>
+<p>Note: if both <code>druid.cache.cluster.nodes</code> and <code>druid.cache.host</code> are provided, cluster mode is preferred.</p>
+<h3><a class="anchor" aria-hidden="true" id="shared-properties"></a><a href="#shared-properties" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Shared Properties</h3>
+<p>Except for the properties above, there are some extra properties which can be customized to meet different needs.</p>
+<table>
+<thead>
+<tr><th>Properties</th><th>Description</th><th>Default</th><th>Required</th></tr>
+</thead>
+<tbody>
+<tr><td><code>druid.cache.password</code></td><td>Password to access redis server/cluster</td><td>None</td><td>no</td></tr>
+<tr><td><code>druid.cache.expiration</code></td><td>Expiration for cache entries</td><td>P1D</td><td>no</td></tr>
+<tr><td><code>druid.cache.timeout</code></td><td>Timeout for connecting to Redis and reading entries from Redis</td><td>PT2S</td><td>no</td></tr>
+<tr><td><code>druid.cache.maxTotalConnections</code></td><td>Max total connections to Redis</td><td>8</td><td>no</td></tr>
+<tr><td><code>druid.cache.maxIdleConnections</code></td><td>Max idle connections to Redis</td><td>8</td><td>no</td></tr>
+<tr><td><code>druid.cache.minIdleConnections</code></td><td>Min idle connections to Redis</td><td>0</td><td>no</td></tr>
+</tbody>
+</table>
+<p>For <code>druid.cache.expiration</code> and <code>druid.cache.timeout</code> properties, values can be format of <code>Period</code> or a number in milliseconds.</p>
+<pre><code class="hljs css language-properties"><span class="hljs-comment"># Period format(recomended)</span>
+<span class="hljs-comment"># cache expires after 1 hour</span>
+<span class="hljs-meta">druid.cache.expiration</span>=<span class="hljs-string">PT1H</span>
+<span class="hljs-comment">
+# or in number(milliseconds) format</span>
+<span class="hljs-comment"># 1 hour = 3_600_000 milliseconds</span>
+<span class="hljs-meta">druid.cache.expiration</span>=<span class="hljs-string">3600000</span>
+</code></pre>
+<h2><a class="anchor" aria-hidden="true" id="metrics"></a><a href="#metrics" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Metrics</h2>
+<p>In addition to the normal cache metrics, the redis cache implementation also reports the following in both <code>total</code> and <code>delta</code></p>
+<table>
+<thead>
+<tr><th>Metric</th><th>Description</th><th>Normal value</th></tr>
+</thead>
+<tbody>
+<tr><td><code>query/cache/redis/*/requests</code></td><td>Count of requests to redis cache</td><td>whatever request to redis will increase request count by 1</td></tr>
+</tbody>
+</table>
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+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
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+  ~
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+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+  -->
+<p>To use this Apache Druid extension, make sure to <a href="/docs/0.20.0/development/extensions.html#loading-extensions">include</a> <code>sqlserver-metadata-storage</code> as an extension.</p>
+<h2><a class="anchor" aria-hidden="true" id="setting-up-sqlserver"></a><a href="#setting-up-sqlserver" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Setting up SQLServer</h2>
+<ol>
+<li><p>Install Microsoft SQLServer</p></li>
+<li><p>Create a druid database and user</p></li>
+</ol>
+<p>Create the druid user</p>
+<ul>
+<li>Microsoft SQL Server Management Studio - Security - Logins - New Login...</li>
+<li>Create a druid user, enter <code>diurd</code> when prompted for the password.</li>
+</ul>
+<p>Create a druid database owned by the user we just created</p>
+<ul>
+<li>Databases - New Database</li>
+<li>Database Name: druid, Owner: druid</li>
+</ul>
+<ol start="3">
+<li>Add the Microsoft JDBC library to the Druid classpath</li>
+</ol>
+<ul>
+<li>To ensure the com.microsoft.sqlserver.jdbc.SQLServerDriver class is loaded you will have to add the appropriate Microsoft JDBC library (sqljdbc*.jar) to the Druid classpath.</li>
+<li>For instance, if all jar files in your &quot;druid/lib&quot; directory are automatically added to your Druid classpath, then manually download the Microsoft JDBC drivers from ( <a href="https://www.microsoft.com/en-ca/download/details.aspx?id=11774">https://www.microsoft.com/en-ca/download/details.aspx?id=11774</a>) and drop it into my druid/lib directory.</li>
+</ul>
+<ol start="4">
+<li>Configure your Druid metadata storage extension:</li>
+</ol>
+<p>Add the following parameters to your Druid configuration, replacing <code>&lt;host&gt;</code>
+with the location (host name and port) of the database.</p>
+<pre><code class="hljs css language-properties"><span class="hljs-meta">druid.metadata.storage.type</span>=<span class="hljs-string">sqlserver</span>
+<span class="hljs-meta">druid.metadata.storage.connector.connectURI</span>=<span class="hljs-string">jdbc:sqlserver://&lt;host&gt;;databaseName=druid</span>
+<span class="hljs-meta">druid.metadata.storage.connector.user</span>=<span class="hljs-string">druid</span>
+<span class="hljs-meta">druid.metadata.storage.connector.password</span>=<span class="hljs-string">diurd</span>
+</code></pre>
+</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/0.20.0/development/extensions-contrib/redis-cache.html"><span class="arrow-prev">← </span><span>Druid Redis Cache</span></a><a class="docs-next button" href="/docs/0.20.0/development/extensions-contrib/statsd.html"><span class="function-name-prevnext">StatsD Emitter</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#setting-up-sqlserver">Setting up SQLServer</a></li></ul></nav></div><footer class="nav-footer druid-footer" id="footer"><div class="container"><div class="text-center"><p><a href="/technology">Technology</a> · <a href="/use-cases">Use Cases</a> · <a href="/druid-powered">Powered by Druid</a> · <a href="/docs/0.20.0/latest">Docs</a> · <a href="/community/">Community</a> · <a href="/downloads.html">Download</a> · <a href="/faq">FAQ</a></p></div><div class="text-center"><a title="Join the user group" href="https://groups.google.com/forum/#!forum/druid-user" target="_blank"><span class="fa fa-comments"></span></a> · <a title="Follow Druid" href="https://twitter.com/druidio" target="_blank"><span class="fab fa-twitter"></span></a> · <a title="Download via Apache" href="https://www.apache.org/dyn/closer.cgi?path=/incubator/druid/{{ site.druid_versions[0].versions[0].version }}/apache-druid-{{ site.druid_versions[0].versions[0].version }}-bin.tar.gz" target="_blank"><span class="fas fa-feather"></span></a> · <a title="GitHub" href="https://github.com/apache/druid" target="_blank"><span class="fab fa-github"></span></a></div><div class="text-center license">Copyright © 2019 <a href="https://www.apache.org/" target="_blank">Apache Software Foundation</a>.<br/>Except where otherwise noted, licensed under <a rel="license" href="http://creativecommons.org/licenses/by-sa/4.0/">CC BY-SA 4.0</a>.<br/>Apache Druid, Druid, and the Druid logo are either registered trademarks or trademarks of The Apache Software Foundation in the United States and other countries.</div></div></footer></div><script type="text/javascript" src="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.js"></script><script>
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+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
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+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
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+  -->
+<p>To use this Apache Druid extension, make sure to <a href="/docs/0.20.0/development/extensions.html#loading-extensions">include</a> <code>statsd-emitter</code> extension.</p>
+<h2><a class="anchor" aria-hidden="true" id="introduction"></a><a href="#introduction" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Introduction</h2>
+<p>This extension emits druid metrics to a StatsD server.
+(<a href="https://github.com/etsy/statsd">https://github.com/etsy/statsd</a>)
+(<a href="https://github.com/armon/statsite">https://github.com/armon/statsite</a>)</p>
+<h2><a class="anchor" aria-hidden="true" id="configuration"></a><a href="#configuration" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Configuration</h2>
+<p>All the configuration parameters for the StatsD emitter are under <code>druid.emitter.statsd</code>.</p>
+<table>
+<thead>
+<tr><th>property</th><th>description</th><th>required?</th><th>default</th></tr>
+</thead>
+<tbody>
+<tr><td><code>druid.emitter.statsd.hostname</code></td><td>The hostname of the StatsD server.</td><td>yes</td><td>none</td></tr>
+<tr><td><code>druid.emitter.statsd.port</code></td><td>The port of the StatsD server.</td><td>yes</td><td>none</td></tr>
+<tr><td><code>druid.emitter.statsd.prefix</code></td><td>Optional metric name prefix.</td><td>no</td><td>&quot;&quot;</td></tr>
+<tr><td><code>druid.emitter.statsd.separator</code></td><td>Metric name separator</td><td>no</td><td>.</td></tr>
+<tr><td><code>druid.emitter.statsd.includeHost</code></td><td>Flag to include the hostname as part of the metric name.</td><td>no</td><td>false</td></tr>
+<tr><td><code>druid.emitter.statsd.dimensionMapPath</code></td><td>JSON file defining the StatsD type, and desired dimensions for every Druid metric</td><td>no</td><td>Default mapping provided. See below.</td></tr>
+<tr><td><code>druid.emitter.statsd.blankHolder</code></td><td>The blank character replacement as StatsD does not support path with blank character</td><td>no</td><td>&quot;-&quot;</td></tr>
+<tr><td><code>druid.emitter.statsd.dogstatsd</code></td><td>Flag to enable <a href="https://docs.datadoghq.com/developers/dogstatsd/">DogStatsD</a> support. Causes dimensions to be included as tags, not as a part of the metric name. <code>convertRange</code> fields will be ignored.</td><td>no</td><td>false</td></tr>
+<tr><td><code>druid.emitter.statsd.dogstatsdConstantTags</code></td><td>If <code>druid.emitter.statsd.dogstatsd</code> is true, the tags in the JSON list of strings will be sent with every event.</td><td>no</td><td>[]</td></tr>
+<tr><td><code>druid.emitter.statsd.dogstatsdServiceAsTag</code></td><td>If <code>druid.emitter.statsd.dogstatsd</code> and <code>druid.emitter.statsd.dogstatsdServiceAsTag</code> are true, druid service (e.g. <code>druid/broker</code>, <code>druid/coordinator</code>, etc) is reported as a tag (e.g. <code>druid_service:druid/broker</code>) instead of being included in metric name (e.g. <code>druid.broker.query.time</code>) and <code>druid</code> is used as metric prefix (e.g. <code>druid.query.time</code>).</td><td>no</td><td>false</td></tr>
+<tr><td><code>druid.emitter.statsd.dogstatsdEvents</code></td><td>If <code>druid.emitter.statsd.dogstatsd</code> and <code>druid.emitter.statsd.dogstatsdEvents</code> are true, <a href="../../operations/alerts.html">Alert events</a> are reported to DogStatsD.</td><td>no</td><td>false</td></tr>
+</tbody>
+</table>
+<h3><a class="anchor" aria-hidden="true" id="druid-to-statsd-event-converter"></a><a href="#druid-to-statsd-event-converter" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Druid to StatsD Event Converter</h3>
+<p>Each metric sent to StatsD must specify a type, one of <code>[timer, counter, guage]</code>. StatsD Emitter expects this mapping to
+be provided as a JSON file.  Additionally, this mapping specifies which dimensions should be included for each metric.
+StatsD expects that metric values be integers.  Druid emits some metrics with values between the range 0 and 1. To accommodate these metrics they are converted
+into the range 0 to 100.  This conversion can be enabled by setting the optional &quot;convertRange&quot; field true in the JSON mapping file.
+If the user does not specify their own JSON file, a default mapping is used.  All
+metrics are expected to be mapped. Metrics which are not mapped will log an error.
+StatsD metric path is organized using the following schema:
+<code>&lt;druid metric name&gt; : { &quot;dimensions&quot; : &lt;dimension list&gt;, &quot;type&quot; : &lt;StatsD type&gt;, &quot;convertRange&quot; : true/false}</code>
+e.g.
+<code>query/time&quot; : { &quot;dimensions&quot; : [&quot;dataSource&quot;, &quot;type&quot;], &quot;type&quot; : &quot;timer&quot;}</code></p>
+<p>For metrics which are emitted from multiple services with different dimensions, the metric name is prefixed with
+the service name.
+e.g.
+<code>&quot;coordinator-segment/count&quot; : { &quot;dimensions&quot; : [&quot;dataSource&quot;], &quot;type&quot; : &quot;gauge&quot; }, &quot;historical-segment/count&quot; : { &quot;dimensions&quot; : [&quot;dataSource&quot;, &quot;tier&quot;, &quot;priority&quot;], &quot;type&quot; : &quot;gauge&quot; }</code></p>
+<p>For most use-cases, the default mapping is sufficient.</p>
+</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/0.20.0/development/extensions-contrib/sqlserver.html"><span class="arrow-prev">← </span><span>Microsoft SQLServer</span></a><a class="docs-next button" href="/docs/0.20.0/development/extensions-contrib/tdigestsketch-quantiles.html"><span>T-Digest Quantiles Sketch module</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#introduction">Introduction</a></li><li><a href="#configuration">Configuration</a><ul class="toc-headings"><li><a href="#druid-to-statsd-event-converter">Druid to StatsD Event Converter</a></li></ul></li></ul></nav></div><footer class="nav-footer druid-footer" id="footer"><div class="container"><div class="text-center"><p><a href="/technology">Technology</a> · <a href="/use-cases">Use Cases</a> · <a href="/druid-powered">Powered by Druid</a> · <a href="/docs/0.20.0/latest">Docs</a> · <a href="/community/">Community</a> · <a href="/downloads.html">Download</a> · <a href="/faq">FAQ</a></p></div><div class="text-center"><a title="Join the user group" href="https://groups.google.com/forum/#!forum/druid-user" target="_blank"><span class="fa fa-comments"></span></a> · <a title="Follow Druid" href="https://twitter.com/druidio" target="_blank"><span class="fab fa-twitter"></span></a> · <a title="Download via Apache" href="https://www.apache.org/dyn/closer.cgi?path=/incubator/druid/{{ site.druid_versions[0].versions[0].version }}/apache-druid-{{ site.druid_versions[0].versions[0].version }}-bin.tar.gz" target="_blank"><span class="fas fa-feather"></span></a> · <a title="GitHub" href="https://github.com/apache/druid" target="_blank"><span class="fab fa-github"></span></a></div><div class="text-center license">Copyright © 2019 <a href="https://www.apache.org/" target="_blank">Apache Software Foundation</a>.<br/>Except where otherwise noted, licensed under <a rel="license" href="http://creativecommons.org/licenses/by-sa/4.0/">CC BY-SA 4.0</a>.<br/>Apache Druid, Druid, and the Druid logo are either registered trademarks or trademarks of The Apache Software Foundation in the United States and other countries.</div></div></footer></div><script type="text/javascript" src="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.js"></script><script>
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+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>T-Digest Quantiles Sketch module · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/0.20.0/development/extensions-contrib/tdigestsketch-quantiles.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.20.0" /><meta property="og:title" content="T-Digest Quantiles Sketch module · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
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class="icon-toc"></i></div></div><div class="navGroups"><div class="navGroup"><h3 class="navGroupCategoryTitle collapsible">Getting started<span class="arrow"><svg width="24" height="24" viewBox="0 0 24 24"><path fill="#565656" d="M7.41 15.41L12 10.83l4.59 4.58L18 14l-6-6-6 6z"></path><path d="M0 0h24v24H0z" fill="none"></path></svg></span></h3><ul class="hide"><li class="navListItem"><a class="navItem" href="/docs/0.20.0/design/index.html">Introduction to Apache Druid</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/tutorials/index.html">Quickstart</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/tutorials/docker.html">Docker</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/operations/single-server.html">Single server deployment</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/tutorials/cluster.html">Clustered deployment</a></li></ul></div><div class="navGroup"><h3 class="navGroupCategoryTitle 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href="/docs/0.20.0/ingestion/tranquility.html">Tranquility</a></li></ul></div><div class="navGroup subNavGroup"><h4 class="navGroupSubcategoryTitle">Batch ingestion</h4><ul><li class="navListItem"><a class="navItem" href="/docs/0.20.0/ingestion/native-batch.html">Native batch</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/ingestion/hadoop.html">Hadoop-based</a></li></ul></div><li class="navListItem"><a class="navItem" href="/docs/0.20.0/ingestion/tasks.html">Task reference</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/ingestion/faq.html">Troubleshooting FAQ</a></li></ul></div><div class="navGroup"><h3 class="navGroupCategoryTitle collapsible">Querying<span class="arrow"><svg width="24" height="24" viewBox="0 0 24 24"><path fill="#565656" d="M7.41 15.41L12 10.83l4.59 4.58L18 14l-6-6-6 6z"></path><path d="M0 0h24v24H0z" fill="none"></path></svg></span></h3><ul class="hide"><li class="navListItem"><a class="navItem" href="/docs/0.20.0/querying/sql.html">Druid SQL</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/querying/querying.html">Native queries</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/querying/query-execution.html">Query execution</a></li><div class="navGroup subNavGroup"><h4 class="navGroupSubcategoryTitle">Concepts</h4><ul><li class="navListItem"><a class="navItem" href="/docs/0.20.0/querying/datasource.html">Datasources</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/querying/joins.html">Joins</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/querying/lookups.html">Lookups</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/querying/multi-value-dimensions.html">Multi-value dimensions</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/querying/multitenancy.html">Multitenancy</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/querying/caching.html">Query caching</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/querying/query-context.html">Context parameters</a></li></ul></div><div class="navGroup subNavGroup"><h4 class="navGroupSubcategoryTitle">Native query types</h4><ul><li class="navListItem"><a class="navItem" href="/docs/0.20.0/querying/timeseriesquery.html">Timeseries</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/querying/topnquery.html">TopN</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/querying/groupbyquery.html">GroupBy</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/querying/scan-query.html">Scan</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/querying/searchquery.html">Search</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/querying/timeboundaryquery.html">TimeBoundary</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/querying/segmentmetadataquery.html">SegmentMetadata</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/querying/datasourcemetadataquery.html">DatasourceMetadata</a></li></ul></div><div class="navGroup subNavGroup"><h4 class="navGroupSubcategoryTitle">Native query components</h4><ul><li class="navListItem"><a class="navItem" href="/docs/0.20.0/querying/filters.html">Filters</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/querying/granularities.html">Granularities</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/querying/dimensionspecs.html">Dimensions</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/querying/aggregations.html">Aggregations</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/querying/post-aggregations.html">Post-aggregations</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/misc/math-expr.html">Expressions</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/querying/having.html">Having filters (groupBy)</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/querying/limitspec.html">Sorting and limiting (groupBy)</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/querying/topnmetricspec.html">Sorting (topN)</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/querying/sorting-orders.html">String comparators</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/querying/virtual-columns.html">Virtual columns</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/geo.html">Spatial filters</a></li></ul></div></ul></div><div class="navGroup"><h3 class="navGroupCategoryTitle collapsible">Configuration<span class="arrow"><svg width="24" height="24" viewBox="0 0 24 24"><path fill="#565656" d="M7.41 15.41L12 10.83l4.59 4.58L18 14l-6-6-6 6z"></path><path d="M0 0h24v24H0z" fill="none"></path></svg></span></h3><ul class="hide"><li class="navListItem"><a class="navItem" href="/docs/0.20.0/configuration/index.html">Configuration reference</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions.html">Extensions</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/configuration/logging.html">Logging</a></li></ul></div><div class="navGroup"><h3 class="navGroupCategoryTitle collapsible">Operations<span class="arrow"><svg width="24" height="24" viewBox="0 0 24 24"><path fill="#565656" d="M7.41 15.41L12 10.83l4.59 4.58L18 14l-6-6-6 6z"></path><path d="M0 0h24v24H0z" fill="none"></path></svg></span></h3><ul class="hide"><li class="navListItem"><a class="navItem" href="/docs/0.20.0/operations/druid-console.html">Web console</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/operations/getting-started.html">Getting started with Apache Druid</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/operations/basic-cluster-tuning.html">Basic cluster tuning</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/operations/api-reference.html">API reference</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/operations/high-availability.html">High availability</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/operations/rolling-updates.html">Rolling updates</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/operations/rule-configuration.html">Retaining or automatically dropping data</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/operations/metrics.html">Metrics</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/operations/alerts.html">Alerts</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/operations/other-hadoop.html">Working with different versions of Apache Hadoop</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/operations/http-compression.html">HTTP compression</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/operations/tls-support.html">TLS support</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/operations/password-provider.html">Password providers</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/operations/dump-segment.html">dump-segment tool</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/operations/reset-cluster.html">reset-cluster tool</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/operations/insert-segment-to-db.html">insert-segment-to-db tool</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/operations/pull-deps.html">pull-deps tool</a></li><div class="navGroup subNavGroup"><h4 class="navGroupSubcategoryTitle">Misc</h4><ul><li class="navListItem"><a class="navItem" href="/docs/0.20.0/operations/management-uis.html">Legacy Management UIs</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/operations/deep-storage-migration.html">Deep storage migration</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/operations/export-metadata.html">Export Metadata Tool</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/operations/metadata-migration.html">Metadata Migration</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/operations/segment-optimization.html">Segment Size Optimization</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/operations/use_sbt_to_build_fat_jar.html">Content for build.sbt</a></li></ul></div></ul></div><div class="navGroup"><h3 class="navGroupCategoryTitle collapsible">Development<span class="arrow"><svg width="24" height="24" viewBox="0 0 24 24"><path fill="#565656" d="M7.41 15.41L12 10.83l4.59 4.58L18 14l-6-6-6 6z"></path><path d="M0 0h24v24H0z" fill="none"></path></svg></span></h3><ul class="hide"><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/overview.html">Developing on Druid</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/modules.html">Creating extensions</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/javascript.html">JavaScript functionality</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/build.html">Build from source</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/versioning.html">Versioning</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/experimental.html">Experimental features</a></li></ul></div><div class="navGroup"><h3 class="navGroupCategoryTitle collapsible">Misc<span class="arrow"><svg width="24" height="24" viewBox="0 0 24 24"><path fill="#565656" d="M7.41 15.41L12 10.83l4.59 4.58L18 14l-6-6-6 6z"></path><path d="M0 0h24v24H0z" fill="none"></path></svg></span></h3><ul class="hide"><li class="navListItem"><a class="navItem" href="/docs/0.20.0/misc/papers-and-talks.html">Papers</a></li></ul></div><div class="navGroup"><h3 class="navGroupCategoryTitle collapsible">Hidden<span class="arrow"><svg width="24" height="24" viewBox="0 0 24 24"><path fill="#565656" d="M7.41 15.41L12 10.83l4.59 4.58L18 14l-6-6-6 6z"></path><path d="M0 0h24v24H0z" fill="none"></path></svg></span></h3><ul class="hide"><li class="navListItem"><a class="navItem" href="/docs/0.20.0/comparisons/druid-vs-elasticsearch.html">Apache Druid vs Elasticsearch</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/comparisons/druid-vs-key-value.html">Apache Druid vs. Key/Value Stores (HBase/Cassandra/OpenTSDB)</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/comparisons/druid-vs-kudu.html">Apache Druid vs Kudu</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/comparisons/druid-vs-redshift.html">Apache Druid vs Redshift</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/comparisons/druid-vs-spark.html">Apache Druid vs Spark</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/comparisons/druid-vs-sql-on-hadoop.html">Apache Druid vs SQL-on-Hadoop</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/design/auth.html">Authentication and Authorization</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/design/broker.html">Broker</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/design/coordinator.html">Coordinator Process</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/design/historical.html">Historical Process</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/design/indexer.html">Indexer Process</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/design/indexing-service.html">Indexing Service</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/design/middlemanager.html">MiddleManager Process</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/design/overlord.html">Overlord Process</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/design/router.html">Router Process</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/design/peons.html">Peons</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-core/approximate-histograms.html">Approximate Histogram aggregators</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-core/avro.html">Apache Avro</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-core/azure.html">Microsoft Azure</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-core/bloom-filter.html">Bloom Filter</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-core/datasketches-extension.html">DataSketches extension</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-core/datasketches-hll.html">DataSketches HLL Sketch module</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-core/datasketches-quantiles.html">DataSketches Quantiles Sketch module</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-core/datasketches-theta.html">DataSketches Theta Sketch module</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-core/datasketches-tuple.html">DataSketches Tuple Sketch module</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-core/druid-basic-security.html">Basic Security</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-core/druid-kerberos.html">Kerberos</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-core/druid-lookups.html">Cached Lookup Module</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-core/druid-ranger-security.html">Apache Ranger Security</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-core/google.html">Google Cloud Storage</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-core/hdfs.html">HDFS</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-core/kafka-extraction-namespace.html">Apache Kafka Lookups</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-core/lookups-cached-global.html">Globally Cached Lookups</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-core/mysql.html">MySQL Metadata Store</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-core/orc.html">ORC Extension</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-core/druid-pac4j.html">Druid pac4j based Security extension</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-core/parquet.html">Apache Parquet Extension</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-core/postgresql.html">PostgreSQL Metadata Store</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-core/protobuf.html">Protobuf</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-core/s3.html">S3-compatible</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-core/simple-client-sslcontext.html">Simple SSLContext Provider Module</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-core/stats.html">Stats aggregator</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-core/test-stats.html">Test Stats Aggregators</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-contrib/ambari-metrics-emitter.html">Ambari Metrics Emitter</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-contrib/cassandra.html">Apache Cassandra</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-contrib/cloudfiles.html">Rackspace Cloud Files</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-contrib/distinctcount.html">DistinctCount Aggregator</a></li><li class="navListItem"><a class="navItem" 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+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
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+  ~ regarding copyright ownership.  The ASF licenses this file
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+<p>This module provides Apache Druid approximate sketch aggregators based on T-Digest.
+T-Digest (<a href="https://github.com/tdunning/t-digest">https://github.com/tdunning/t-digest</a>) is a popular data structure for accurate on-line accumulation of
+rank-based statistics such as quantiles and trimmed means.
+The data structure is also designed for parallel programming use cases like distributed aggregations or map reduce jobs by making combining two intermediate t-digests easy and efficient.</p>
+<p>The tDigestSketch aggregator is capable of generating sketches from raw numeric values as well as
+aggregating/combining pre-generated T-Digest sketches generated using the tDigestSketch aggregator itself.
+While one can generate sketches on the fly during the query time itself, it generally is more performant
+to generate sketches during ingestion time itself and then combining them during query time.
+The module also provides a postAggregator, quantilesFromTDigestSketch, that can be used to compute approximate
+quantiles from T-Digest sketches generated by the tDigestSketch aggregator.</p>
+<p>To use this aggregator, make sure you <a href="/docs/0.20.0/development/extensions.html#loading-extensions">include</a> the extension in your config file:</p>
+<pre><code class="hljs"><span class="hljs-attr">druid.extensions.loadList</span>=[<span class="hljs-string">"druid-tdigestsketch"</span>]
+</code></pre>
+<h3><a class="anchor" aria-hidden="true" id="aggregator"></a><a href="#aggregator" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Aggregator</h3>
+<p>The result of the aggregation is a T-Digest sketch that is built ingesting numeric values from the raw data or from
+combining pre-generated T-Digest sketches.</p>
+<pre><code class="hljs css language-json">{
+  <span class="hljs-attr">"type"</span> : <span class="hljs-string">"tDigestSketch"</span>,
+  <span class="hljs-attr">"name"</span> : &lt;output_name&gt;,
+  <span class="hljs-attr">"fieldName"</span> : &lt;metric_name&gt;,
+  <span class="hljs-attr">"compression"</span>: &lt;parameter that controls size and accuracy&gt;
+ }
+</code></pre>
+<p>Example:</p>
+<pre><code class="hljs css language-json">{
+    <span class="hljs-attr">"type"</span>: <span class="hljs-string">"tDigestSketch"</span>,
+    <span class="hljs-attr">"name"</span>: <span class="hljs-string">"sketch"</span>,
+    <span class="hljs-attr">"fieldName"</span>: <span class="hljs-string">"session_duration"</span>,
+    <span class="hljs-attr">"compression"</span>: <span class="hljs-number">200</span>
+}
+</code></pre>
+<pre><code class="hljs css language-json">{
+    <span class="hljs-attr">"type"</span>: <span class="hljs-string">"tDigestSketch"</span>,
+    <span class="hljs-attr">"name"</span>: <span class="hljs-string">"combined_sketch"</span>,
+    <span class="hljs-attr">"fieldName"</span>: &lt;input-column&gt;,
+    <span class="hljs-attr">"compression"</span>: <span class="hljs-number">200</span>
+}
+</code></pre>
+<table>
+<thead>
+<tr><th>property</th><th>description</th><th>required?</th></tr>
+</thead>
+<tbody>
+<tr><td>type</td><td>This String should always be &quot;tDigestSketch&quot;</td><td>yes</td></tr>
+<tr><td>name</td><td>A String for the output (result) name of the calculation.</td><td>yes</td></tr>
+<tr><td>fieldName</td><td>A String for the name of the input field containing raw numeric values or pre-generated T-Digest sketches.</td><td>yes</td></tr>
+<tr><td>compression</td><td>Parameter that determines the accuracy and size of the sketch. Higher compression means higher accuracy but more space to store sketches.</td><td>no, defaults to 100</td></tr>
+</tbody>
+</table>
+<h3><a class="anchor" aria-hidden="true" id="post-aggregators"></a><a href="#post-aggregators" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Post Aggregators</h3>
+<h4><a class="anchor" aria-hidden="true" id="quantiles"></a><a href="#quantiles" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Quantiles</h4>
+<p>This returns an array of quantiles corresponding to a given array of fractions.</p>
+<pre><code class="hljs css language-json">{
+  <span class="hljs-attr">"type"</span>  : <span class="hljs-string">"quantilesFromTDigestSketch"</span>,
+  <span class="hljs-attr">"name"</span>: &lt;output name&gt;,
+  <span class="hljs-attr">"field"</span>  : &lt;post aggregator that refers to a TDigestSketch (fieldAccess or another post aggregator)&gt;,
+  <span class="hljs-attr">"fractions"</span> : &lt;array of fractions&gt;
+}
+</code></pre>
+<table>
+<thead>
+<tr><th>property</th><th>description</th><th>required?</th></tr>
+</thead>
+<tbody>
+<tr><td>type</td><td>This String should always be &quot;quantilesFromTDigestSketch&quot;</td><td>yes</td></tr>
+<tr><td>name</td><td>A String for the output (result) name of the calculation.</td><td>yes</td></tr>
+<tr><td>field</td><td>A field reference pointing to the field aggregated/combined T-Digest sketch.</td><td>yes</td></tr>
+<tr><td>fractions</td><td>Non-empty array of fractions between 0 and 1</td><td>yes</td></tr>
+</tbody>
+</table>
+<p>Example:</p>
+<pre><code class="hljs css language-json">{
+    <span class="hljs-attr">"queryType"</span>: <span class="hljs-string">"groupBy"</span>,
+    <span class="hljs-attr">"dataSource"</span>: <span class="hljs-string">"test_datasource"</span>,
+    <span class="hljs-attr">"granularity"</span>: <span class="hljs-string">"ALL"</span>,
+    <span class="hljs-attr">"dimensions"</span>: [],
+    <span class="hljs-attr">"aggregations"</span>: [{
+        <span class="hljs-attr">"type"</span>: <span class="hljs-string">"tDigestSketch"</span>,
+        <span class="hljs-attr">"name"</span>: <span class="hljs-string">"merged_sketch"</span>,
+        <span class="hljs-attr">"fieldName"</span>: <span class="hljs-string">"ingested_sketch"</span>,
+        <span class="hljs-attr">"compression"</span>: <span class="hljs-number">200</span>
+    }],
+    <span class="hljs-attr">"postAggregations"</span>: [{
+        <span class="hljs-attr">"type"</span>: <span class="hljs-string">"quantilesFromTDigestSketch"</span>,
+        <span class="hljs-attr">"name"</span>: <span class="hljs-string">"quantiles"</span>,
+        <span class="hljs-attr">"fractions"</span>: [<span class="hljs-number">0</span>, <span class="hljs-number">0.5</span>, <span class="hljs-number">1</span>],
+        <span class="hljs-attr">"field"</span>: {
+            <span class="hljs-attr">"type"</span>: <span class="hljs-string">"fieldAccess"</span>,
+            <span class="hljs-attr">"fieldName"</span>: <span class="hljs-string">"merged_sketch"</span>
+        }
+    }],
+    <span class="hljs-attr">"intervals"</span>: [<span class="hljs-string">"2016-01-01T00:00:00.000Z/2016-01-31T00:00:00.000Z"</span>]
+}
+</code></pre>
+<p>Similar to quantilesFromTDigestSketch except it takes in a single fraction for computing quantile.</p>
+<pre><code class="hljs css language-json">{
+  <span class="hljs-attr">"type"</span>  : <span class="hljs-string">"quantileFromTDigestSketch"</span>,
+  <span class="hljs-attr">"name"</span>: &lt;output name&gt;,
+  <span class="hljs-attr">"field"</span>  : &lt;post aggregator that refers to a TDigestSketch (fieldAccess or another post aggregator)&gt;,
+  <span class="hljs-attr">"fraction"</span> : &lt;value&gt;
+}
+</code></pre>
+<table>
+<thead>
+<tr><th>property</th><th>description</th><th>required?</th></tr>
+</thead>
+<tbody>
+<tr><td>type</td><td>This String should always be &quot;quantileFromTDigestSketch&quot;</td><td>yes</td></tr>
+<tr><td>name</td><td>A String for the output (result) name of the calculation.</td><td>yes</td></tr>
+<tr><td>field</td><td>A field reference pointing to the field aggregated/combined T-Digest sketch.</td><td>yes</td></tr>
+<tr><td>fraction</td><td>Decimal value between 0 and 1</td><td>yes</td></tr>
+</tbody>
+</table>
+</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/0.20.0/development/extensions-contrib/statsd.html"><span class="arrow-prev">← </span><span class="function-name-prevnext">StatsD Emitter</span></a><a class="docs-next button" href="/docs/0.20.0/development/extensions-contrib/thrift.html"><span>Thrift</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"></nav></div><footer class="nav-footer druid-footer" id="footer"><div class="container"><div class="text-center"><p><a href="/technology">Technology</a> · <a href="/use-cases">Use Cases</a> · <a href="/druid-powered">Powered by Druid</a> · <a href="/docs/0.20.0/latest">Docs</a> · <a href="/community/">Community</a> · <a href="/downloads.html">Download</a> · <a href="/faq">FAQ</a></p></div><div class="text-center"><a title="Join the user group" href="https://groups.google.com/forum/#!forum/druid-user" target="_blank"><span class="fa fa-comments"></span></a> · <a title="Follow Druid" href="https://twitter.com/druidio" target="_blank"><span class="fab fa-twitter"></span></a> · <a title="Download via Apache" href="https://www.apache.org/dyn/closer.cgi?path=/incubator/druid/{{ site.druid_versions[0].versions[0].version }}/apache-druid-{{ site.druid_versions[0].versions[0].version }}-bin.tar.gz" target="_blank"><span class="fas fa-feather"></span></a> · <a title="GitHub" href="https://github.com/apache/druid" target="_blank"><span class="fab fa-github"></span></a></div><div class="text-center license">Copyright © 2019 <a href="https://www.apache.org/" target="_blank">Apache Software Foundation</a>.<br/>Except where otherwise noted, licensed under <a rel="license" href="http://creativecommons.org/licenses/by-sa/4.0/">CC BY-SA 4.0</a>.<br/>Apache Druid, Druid, and the Druid logo are either registered trademarks or trademarks of The Apache Software Foundation in the United States and other countries.</div></div></footer></div><script type="text/javascript" src="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.js"></script><script>
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UIs</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/operations/deep-storage-migration.html">Deep storage migration</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/operations/export-metadata.html">Export Metadata Tool</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/operations/metadata-migration.html">Metadata Migration</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/operations/segment-optimization.html">Segment Size Optimization</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/operations/use_sbt_to_build_fat_jar.html">Content for build.sbt</a></li></ul></div></ul></div><div class="navGroup"><h3 class="navGroupCategoryTitle collapsible">Development<span class="arrow"><svg width="24" height="24" viewBox="0 0 24 24"><path fill="#565656" d="M7.41 15.41L12 10.83l4.59 4.58L18 14l-6-6-6 6z"></path><path d="M0 0h24v24H0z" fill="none"></path></svg></span></h3><ul class="hide"><li 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+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
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+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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+  -->
+<p>To use this Apache Druid extension, make sure to <a href="/docs/0.20.0/development/extensions.html#loading-extensions">include</a> <code>druid-thrift-extensions</code>.</p>
+<p>This extension enables Druid to ingest thrift compact data online (<code>ByteBuffer</code>) and offline (SequenceFile of type <code>&lt;Writable, BytesWritable&gt;</code> or LzoThriftBlock File).</p>
+<p>You may want to use another version of thrift, change the dependency in pom and compile yourself.</p>
+<h2><a class="anchor" aria-hidden="true" id="lzo-support"></a><a href="#lzo-support" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>LZO Support</h2>
+<p>If you plan to read LZO-compressed Thrift files, you will need to download version 0.4.19 of the <a href="https://mvnrepository.com/artifact/com.hadoop.gplcompression/hadoop-lzo/0.4.19">hadoop-lzo JAR</a> and place it in your <code>extensions/druid-thrift-extensions</code> directory.</p>
+<h2><a class="anchor" aria-hidden="true" id="thrift-parser"></a><a href="#thrift-parser" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Thrift Parser</h2>
+<table>
+<thead>
+<tr><th>Field</th><th>Type</th><th>Description</th><th>Required</th></tr>
+</thead>
+<tbody>
+<tr><td>type</td><td>String</td><td>This should say <code>thrift</code></td><td>yes</td></tr>
+<tr><td>parseSpec</td><td>JSON Object</td><td>Specifies the timestamp and dimensions of the data. Should be a JSON parseSpec.</td><td>yes</td></tr>
+<tr><td>thriftJar</td><td>String</td><td>path of thrift jar, if not provided, it will try to find the thrift class in classpath. Thrift jar in batch ingestion should be uploaded to HDFS first and configure <code>jobProperties</code> with <code>&quot;tmpjars&quot;:&quot;/path/to/your/thrift.jar&quot;</code></td><td>no</td></tr>
+<tr><td>thriftClass</td><td>String</td><td>classname of thrift</td><td>yes</td></tr>
+</tbody>
+</table>
+<ul>
+<li>Batch Ingestion example - <code>inputFormat</code> and <code>tmpjars</code> should be set.</li>
+</ul>
+<p>This is for batch ingestion using the HadoopDruidIndexer. The inputFormat of inputSpec in ioConfig could be one of <code>&quot;org.apache.hadoop.mapreduce.lib.input.SequenceFileInputFormat&quot;</code> and <code>com.twitter.elephantbird.mapreduce.input.LzoThriftBlockInputFormat</code>. Be careful, when <code>LzoThriftBlockInputFormat</code> is used, thrift class must be provided twice.</p>
+<pre><code class="hljs css language-json">{
+  "type": "index_hadoop",
+  "spec": {
+    "dataSchema": {
+      "dataSource": "book",
+      "parser": {
+        "type": "thrift",
+        "jarPath": "book.jar",
+        "thriftClass": "org.apache.druid.data.input.thrift.Book",
+        "protocol": "compact",
+        "parseSpec": {
+          "format": "json",
+          ...
+        }
+      },
+      "metricsSpec": [],
+      "granularitySpec": {}
+    },
+    "ioConfig": {
+      "type": "hadoop",
+      "inputSpec": {
+        "type": "static",
+        "inputFormat": "org.apache.hadoop.mapreduce.lib.input.SequenceFileInputFormat",
+        // "inputFormat": "com.twitter.elephantbird.mapreduce.input.LzoThriftBlockInputFormat",
+        "paths": "/user/to/some/book.seq"
+      }
+    },
+    "tuningConfig": {
+      "type": "hadoop",
+      "jobProperties": {
+        "tmpjars":"/user/h_user_profile/du00/druid/test/book.jar",
+        // "elephantbird.class.for.MultiInputFormat" : "${YOUR_THRIFT_CLASS_NAME}"
+      }
+    }
+  }
+}
+</code></pre>
+</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/0.20.0/development/extensions-contrib/tdigestsketch-quantiles.html"><span class="arrow-prev">← </span><span>T-Digest Quantiles Sketch module</span></a><a class="docs-next button" href="/docs/0.20.0/development/extensions-contrib/time-min-max.html"><span>Timestamp Min/Max aggregators</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#lzo-support">LZO Support</a></li><li><a href="#thrift-parser">Thrift Parser</a></li></ul></nav></div><footer class="nav-footer druid-footer" id="footer"><div class="container"><div class="text-center"><p><a href="/technology">Technology</a> · <a href="/use-cases">Use Cases</a> · <a href="/druid-powered">Powered by Druid</a> · <a href="/docs/0.20.0/latest">Docs</a> · <a href="/community/">Community</a> · <a href="/downloads.html">Download</a> · <a href="/faq">FAQ</a></p></div><div class="text-center"><a title="Join the user group" href="https://groups.google.com/forum/#!forum/druid-user" target="_blank"><span class="fa fa-comments"></span></a> · <a title="Follow Druid" href="https://twitter.com/druidio" target="_blank"><span class="fab fa-twitter"></span></a> · <a title="Download via Apache" href="https://www.apache.org/dyn/closer.cgi?path=/incubator/druid/{{ site.druid_versions[0].versions[0].version }}/apache-druid-{{ site.druid_versions[0].versions[0].version }}-bin.tar.gz" target="_blank"><span class="fas fa-feather"></span></a> · <a title="GitHub" href="https://github.com/apache/druid" target="_blank"><span class="fab fa-github"></span></a></div><div class="text-center license">Copyright © 2019 <a href="https://www.apache.org/" target="_blank">Apache Software Foundation</a>.<br/>Except where otherwise noted, licensed under <a rel="license" href="http://creativecommons.org/licenses/by-sa/4.0/">CC BY-SA 4.0</a>.<br/>Apache Druid, Druid, and the Druid logo are either registered trademarks or trademarks of The Apache Software Foundation in the United States and other countries.</div></div></footer></div><script type="text/javascript" src="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.js"></script><script>
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+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+  -->
+<p>To use this Apache Druid extension, make sure to <a href="/docs/0.20.0/development/extensions.html#loading-extensions">include</a> <code>druid-time-min-max</code>.</p>
+<p>These aggregators enable more precise calculation of min and max time of given events than <code>__time</code> column whose granularity is sparse, the same as query granularity.
+To use this feature, a &quot;timeMin&quot; or &quot;timeMax&quot; aggregator must be included at indexing time.
+They can apply to any columns that can be converted to timestamp, which include Long, DateTime, Timestamp, and String types.</p>
+<p>For example, when a data set consists of timestamp, dimension, and metric value like followings.</p>
+<pre><code class="hljs"><span class="hljs-number">2015</span><span class="hljs-number">-07</span><span class="hljs-number">-28</span>T01:<span class="hljs-number">00</span>:<span class="hljs-number">00.000</span>Z  A  <span class="hljs-number">1</span>
+<span class="hljs-number">2015</span><span class="hljs-number">-07</span><span class="hljs-number">-28</span>T02:<span class="hljs-number">00</span>:<span class="hljs-number">00.000</span>Z  A  <span class="hljs-number">1</span>
+<span class="hljs-number">2015</span><span class="hljs-number">-07</span><span class="hljs-number">-28</span>T03:<span class="hljs-number">00</span>:<span class="hljs-number">00.000</span>Z  A  <span class="hljs-number">1</span>
+<span class="hljs-number">2015</span><span class="hljs-number">-07</span><span class="hljs-number">-28</span>T04:<span class="hljs-number">00</span>:<span class="hljs-number">00.000</span>Z  B  <span class="hljs-number">1</span>
+<span class="hljs-number">2015</span><span class="hljs-number">-07</span><span class="hljs-number">-28</span>T05:<span class="hljs-number">00</span>:<span class="hljs-number">00.000</span>Z  A  <span class="hljs-number">1</span>
+<span class="hljs-number">2015</span><span class="hljs-number">-07</span><span class="hljs-number">-28</span>T06:<span class="hljs-number">00</span>:<span class="hljs-number">00.000</span>Z  B  <span class="hljs-number">1</span>
+<span class="hljs-number">2015</span><span class="hljs-number">-07</span><span class="hljs-number">-29</span>T01:<span class="hljs-number">00</span>:<span class="hljs-number">00.000</span>Z  C  <span class="hljs-number">1</span>
+<span class="hljs-number">2015</span><span class="hljs-number">-07</span><span class="hljs-number">-29</span>T02:<span class="hljs-number">00</span>:<span class="hljs-number">00.000</span>Z  C  <span class="hljs-number">1</span>
+<span class="hljs-number">2015</span><span class="hljs-number">-07</span><span class="hljs-number">-29</span>T03:<span class="hljs-number">00</span>:<span class="hljs-number">00.000</span>Z  A  <span class="hljs-number">1</span>
+<span class="hljs-number">2015</span><span class="hljs-number">-07</span><span class="hljs-number">-29</span>T04:<span class="hljs-number">00</span>:<span class="hljs-number">00.000</span>Z  A  <span class="hljs-number">1</span>
+</code></pre>
+<p>At ingestion time, timeMin and timeMax aggregator can be included as other aggregators.</p>
+<pre><code class="hljs css language-json">{
+    <span class="hljs-attr">"type"</span>: <span class="hljs-string">"timeMin"</span>,
+    <span class="hljs-attr">"name"</span>: <span class="hljs-string">"tmin"</span>,
+    <span class="hljs-attr">"fieldName"</span>: <span class="hljs-string">"&lt;field_name, typically column specified in timestamp spec&gt;"</span>
+}
+</code></pre>
+<pre><code class="hljs css language-json">{
+    <span class="hljs-attr">"type"</span>: <span class="hljs-string">"timeMax"</span>,
+    <span class="hljs-attr">"name"</span>: <span class="hljs-string">"tmax"</span>,
+    <span class="hljs-attr">"fieldName"</span>: <span class="hljs-string">"&lt;field_name, typically column specified in timestamp spec&gt;"</span>
+}
+</code></pre>
+<p><code>name</code> is output name of aggregator and can be any string. <code>fieldName</code> is typically column specified in timestamp spec but can be any column that can be converted to timestamp.</p>
+<p>To query for results, the same aggregators &quot;timeMin&quot; and &quot;timeMax&quot; is used.</p>
+<pre><code class="hljs css language-json">{
+  <span class="hljs-attr">"queryType"</span>: <span class="hljs-string">"groupBy"</span>,
+  <span class="hljs-attr">"dataSource"</span>: <span class="hljs-string">"timeMinMax"</span>,
+  <span class="hljs-attr">"granularity"</span>: <span class="hljs-string">"DAY"</span>,
+  <span class="hljs-attr">"dimensions"</span>: [<span class="hljs-string">"product"</span>],
+  <span class="hljs-attr">"aggregations"</span>: [
+    {
+      <span class="hljs-attr">"type"</span>: <span class="hljs-string">"count"</span>,
+      <span class="hljs-attr">"name"</span>: <span class="hljs-string">"count"</span>
+    },
+    {
+      <span class="hljs-attr">"type"</span>: <span class="hljs-string">"timeMin"</span>,
+      <span class="hljs-attr">"name"</span>: <span class="hljs-string">"&lt;output_name of timeMin&gt;"</span>,
+      <span class="hljs-attr">"fieldName"</span>: <span class="hljs-string">"tmin"</span>
+    },
+    {
+      <span class="hljs-attr">"type"</span>: <span class="hljs-string">"timeMax"</span>,
+      <span class="hljs-attr">"name"</span>: <span class="hljs-string">"&lt;output_name of timeMax&gt;"</span>,
+      <span class="hljs-attr">"fieldName"</span>: <span class="hljs-string">"tmax"</span>
+    }
+  ],
+  <span class="hljs-attr">"intervals"</span>: [
+    <span class="hljs-string">"2010-01-01T00:00:00.000Z/2020-01-01T00:00:00.000Z"</span>
+  ]
+}
+</code></pre>
+<p>Then, result has min and max of timestamp, which is finer than query granularity.</p>
+<pre><code class="hljs"><span class="hljs-number">2015</span><span class="hljs-number">-07</span><span class="hljs-number">-28</span>T00:<span class="hljs-number">00</span>:<span class="hljs-number">00.000</span>Z A <span class="hljs-number">4</span> <span class="hljs-number">2015</span><span class="hljs-number">-07</span><span class="hljs-number">-28</span>T01:<span class="hljs-number">00</span>:<span class="hljs-number">00.000</span>Z <span class="hljs-number">2015</span><span class="hljs-number">-07</span><span class="hljs-number">-28</span>T05:<span class="hljs-number">00</span>:<span class="hljs-number">00.000</span>Z
+<span class="hljs-number">2015</span><span class="hljs-number">-07</span><span class="hljs-number">-28</span>T00:<span class="hljs-number">00</span>:<span class="hljs-number">00.000</span>Z B <span class="hljs-number">2</span> <span class="hljs-number">2015</span><span class="hljs-number">-07</span><span class="hljs-number">-28</span>T04:<span class="hljs-number">00</span>:<span class="hljs-number">00.000</span>Z <span class="hljs-number">2015</span><span class="hljs-number">-07</span><span class="hljs-number">-28</span>T06:<span class="hljs-number">00</span>:<span class="hljs-number">00.000</span>Z
+<span class="hljs-number">2015</span><span class="hljs-number">-07</span><span class="hljs-number">-29</span>T00:<span class="hljs-number">00</span>:<span class="hljs-number">00.000</span>Z A <span class="hljs-number">2</span> <span class="hljs-number">2015</span><span class="hljs-number">-07</span><span class="hljs-number">-29</span>T03:<span class="hljs-number">00</span>:<span class="hljs-number">00.000</span>Z <span class="hljs-number">2015</span><span class="hljs-number">-07</span><span class="hljs-number">-29</span>T04:<span class="hljs-number">00</span>:<span class="hljs-number">00.000</span>Z
+<span class="hljs-number">2015</span><span class="hljs-number">-07</span><span class="hljs-number">-29</span>T00:<span class="hljs-number">00</span>:<span class="hljs-number">00.000</span>Z C <span class="hljs-number">2</span> <span class="hljs-number">2015</span><span class="hljs-number">-07</span><span class="hljs-number">-29</span>T01:<span class="hljs-number">00</span>:<span class="hljs-number">00.000</span>Z <span class="hljs-number">2015</span><span class="hljs-number">-07</span><span class="hljs-number">-29</span>T02:<span class="hljs-number">00</span>:<span class="hljs-number">00.000</span>Z
+</code></pre>
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+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Approximate Histogram aggregators · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/0.20.0/development/extensions-core/approximate-histograms.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.20.0" /><meta property="og:title" content="Approximate Histogram aggregators · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
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+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
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+<p>To use this Apache Druid extension, make sure to <a href="/docs/0.20.0/development/extensions.html#loading-extensions">include</a> <code>druid-histogram</code> as an extension.</p>
+<p>The <code>druid-histogram</code> extension provides an approximate histogram aggregator and a fixed buckets histogram aggregator.</p>
+<p><a name="approximate-histogram-aggregator"></a></p>
+<h2><a class="anchor" aria-hidden="true" id="approximate-histogram-aggregator-deprecated"></a><a href="#approximate-histogram-aggregator-deprecated" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Approximate Histogram aggregator (Deprecated)</h2>
+<blockquote>
+<p>The Approximate Histogram aggregator is deprecated. Please use <a href="/docs/0.20.0/development/extensions-core/datasketches-quantiles.html">DataSketches Quantiles</a> instead which provides a superior distribution-independent algorithm with formal error guarantees.</p>
+</blockquote>
+<p>This aggregator is based on
+<a href="http://jmlr.org/papers/volume11/ben-haim10a/ben-haim10a.pdf">http://jmlr.org/papers/volume11/ben-haim10a/ben-haim10a.pdf</a>
+to compute approximate histograms, with the following modifications:</p>
+<ul>
+<li>some tradeoffs in accuracy were made in the interest of speed (see below)</li>
+<li>the sketch maintains the exact original data as long as the number of
+distinct data points is fewer than the resolutions (number of centroids),
+increasing accuracy when there are few data points, or when dealing with
+discrete data points. You can find some of the details in <a href="https://metamarkets.com/2013/histograms/">this post</a>.</li>
+</ul>
+<p>Approximate histogram sketches are still experimental for a reason, and you
+should understand the limitations of the current implementation before using
+them. The approximation is heavily data-dependent, which makes it difficult to
+give good general guidelines, so you should experiment and see what parameters
+work well for your data.</p>
+<p>Here are a few things to note before using them:</p>
+<ul>
+<li>As indicated in the original paper, there are no formal error bounds on the
+approximation. In practice, the approximation gets worse if the distribution
+is skewed.</li>
+<li>The algorithm is order-dependent, so results can vary for the same query, due
+to variations in the order in which results are merged.</li>
+<li>In general, the algorithm only works well if the data that comes is randomly
+distributed (i.e. if data points end up sorted in a column, approximation
+will be horrible)</li>
+<li>We traded accuracy for aggregation speed, taking some shortcuts when adding
+histograms together, which can lead to pathological cases if your data is
+ordered in some way, or if your distribution has long tails. It should be
+cheaper to increase the resolution of the sketch to get the accuracy you need.</li>
+</ul>
+<p>That being said, those sketches can be useful to get a first order approximation
+when averages are not good enough. Assuming most rows in your segment store
+fewer data points than the resolution of histogram, you should be able to use
+them for monitoring purposes and detect meaningful variations with a few
+hundred centroids. To get good accuracy readings on 95th percentiles with
+millions of rows of data, you may want to use several thousand centroids,
+especially with long tails, since that's where the approximation will be worse.</p>
+<h3><a class="anchor" aria-hidden="true" id="creating-approximate-histogram-sketches-at-ingestion-time"></a><a href="#creating-approximate-histogram-sketches-at-ingestion-time" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Creating approximate histogram sketches at ingestion time</h3>
+<p>To use this feature, an &quot;approxHistogram&quot; or &quot;approxHistogramFold&quot; aggregator must be included at
+indexing time. The ingestion aggregator can only apply to numeric values. If you use &quot;approxHistogram&quot;
+then any input rows missing the value will be considered to have a value of 0, while with &quot;approxHistogramFold&quot;
+such rows will be ignored.</p>
+<p>To query for results, an &quot;approxHistogramFold&quot; aggregator must be included in the
+query.</p>
+<pre><code class="hljs css language-json">{
+  <span class="hljs-attr">"type"</span> : <span class="hljs-string">"approxHistogram or approxHistogramFold (at ingestion time), approxHistogramFold (at query time)"</span>,
+  <span class="hljs-attr">"name"</span> : &lt;output_name&gt;,
+  <span class="hljs-attr">"fieldName"</span> : &lt;metric_name&gt;,
+  <span class="hljs-attr">"resolution"</span> : &lt;integer&gt;,
+  <span class="hljs-attr">"numBuckets"</span> : &lt;integer&gt;,
+  <span class="hljs-attr">"lowerLimit"</span> : &lt;float&gt;,
+  <span class="hljs-attr">"upperLimit"</span> : &lt;float&gt;
+}
+</code></pre>
+<table>
+<thead>
+<tr><th>Property</th><th>Description</th><th>Default</th></tr>
+</thead>
+<tbody>
+<tr><td><code>resolution</code></td><td>Number of centroids (data points) to store. The higher the resolution, the more accurate results are, but the slower the computation will be.</td><td>50</td></tr>
+<tr><td><code>numBuckets</code></td><td>Number of output buckets for the resulting histogram. Bucket intervals are dynamic, based on the range of the underlying data. Use a post-aggregator to have finer control over the bucketing scheme</td><td>7</td></tr>
+<tr><td><code>lowerLimit</code>/<code>upperLimit</code></td><td>Restrict the approximation to the given range. The values outside this range will be aggregated into two centroids. Counts of values outside this range are still maintained.</td><td>-INF/+INF</td></tr>
+<tr><td><code>finalizeAsBase64Binary</code></td><td>If true, the finalized aggregator value will be a Base64-encoded byte array containing the serialized form of the histogram. If false, the finalized aggregator value will be a JSON representation of the histogram.</td><td>false</td></tr>
+</tbody>
+</table>
+<h2><a class="anchor" aria-hidden="true" id="fixed-buckets-histogram"></a><a href="#fixed-buckets-histogram" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Fixed Buckets Histogram</h2>
+<p>The fixed buckets histogram aggregator builds a histogram on a numeric column, with evenly-sized buckets across a specified value range. Values outside of the range are handled based on a user-specified outlier handling mode.</p>
+<p>This histogram supports the min/max/quantiles post-aggregators but does not support the bucketing post-aggregators.</p>
+<h3><a class="anchor" aria-hidden="true" id="when-to-use"></a><a href="#when-to-use" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>When to use</h3>
+<p>The accuracy/usefulness of the fixed buckets histogram is extremely data-dependent; it is provided to support special use cases where the user has a great deal of prior information about the data being aggregated and knows that a fixed buckets implementation is suitable.</p>
+<p>For general histogram and quantile use cases, the <a href="/docs/0.20.0/development/extensions-core/datasketches-quantiles.html">DataSketches Quantiles Sketch</a> extension is recommended.</p>
+<h3><a class="anchor" aria-hidden="true" id="properties"></a><a href="#properties" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Properties</h3>
+<table>
+<thead>
+<tr><th>Property</th><th>Description</th><th>Default</th></tr>
+</thead>
+<tbody>
+<tr><td><code>type</code></td><td>Type of the aggregator. Must <code>fixedBucketsHistogram</code>.</td><td>No default, must be specified</td></tr>
+<tr><td><code>name</code></td><td>Column name for the aggregator.</td><td>No default, must be specified</td></tr>
+<tr><td><code>fieldName</code></td><td>Column name of the input to the aggregator.</td><td>No default, must be specified</td></tr>
+<tr><td><code>lowerLimit</code></td><td>Lower limit of the histogram.</td><td>No default, must be specified</td></tr>
+<tr><td><code>upperLimit</code></td><td>Upper limit of the histogram.</td><td>No default, must be specified</td></tr>
+<tr><td><code>numBuckets</code></td><td>Number of buckets for the histogram. The range [lowerLimit, upperLimit] will be divided into <code>numBuckets</code> intervals of equal size.</td><td>10</td></tr>
+<tr><td><code>outlierHandlingMode</code></td><td>Specifies how values outside of [lowerLimit, upperLimit] will be handled. Supported modes are &quot;ignore&quot;, &quot;overflow&quot;, and &quot;clip&quot;. See <a href="#outlier-handling-modes">outlier handling modes</a> for more details.</td><td>No default, must be specified</td></tr>
+<tr><td><code>finalizeAsBase64Binary</code></td><td>If true, the finalized aggregator value will be a Base64-encoded byte array containing the <a href="#serialization-formats">serialized form</a> of the histogram. If false, the finalized aggregator value will be a JSON representation of the histogram.</td><td>false</td></tr>
+</tbody>
+</table>
+<p>An example aggregator spec is shown below:</p>
+<pre><code class="hljs css language-json">{
+  <span class="hljs-attr">"type"</span> : <span class="hljs-string">"fixedBucketsHistogram"</span>,
+  <span class="hljs-attr">"name"</span> : &lt;output_name&gt;,
+  <span class="hljs-attr">"fieldName"</span> : &lt;metric_name&gt;,
+  <span class="hljs-attr">"numBuckets"</span> : &lt;integer&gt;,
+  <span class="hljs-attr">"lowerLimit"</span> : &lt;double&gt;,
+  <span class="hljs-attr">"upperLimit"</span> : &lt;double&gt;,
+  <span class="hljs-attr">"outlierHandlingMode"</span>: &lt;mode&gt;
+}
+</code></pre>
+<h3><a class="anchor" aria-hidden="true" id="outlier-handling-modes"></a><a href="#outlier-handling-modes" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Outlier handling modes</h3>
+<p>The outlier handling mode specifies what should be done with values outside of the histogram's range. There are three supported modes:</p>
+<ul>
+<li><code>ignore</code>: Throw away outlier values.</li>
+<li><code>overflow</code>: A count of outlier values will be tracked by the histogram, available in the <code>lowerOutlierCount</code> and <code>upperOutlierCount</code> fields.</li>
+<li><code>clip</code>: Outlier values will be clipped to the <code>lowerLimit</code> or the <code>upperLimit</code> and included in the histogram.</li>
+</ul>
+<p>If you don't care about outliers, <code>ignore</code> is the cheapest option performance-wise. There is currently no difference in storage size among the modes.</p>
+<h3><a class="anchor" aria-hidden="true" id="output-fields"></a><a href="#output-fields" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Output fields</h3>
+<p>The histogram aggregator's output object has the following fields:</p>
+<ul>
+<li><code>lowerLimit</code>: Lower limit of the histogram</li>
+<li><code>upperLimit</code>: Upper limit of the histogram</li>
+<li><code>numBuckets</code>: Number of histogram buckets</li>
+<li><code>outlierHandlingMode</code>: Outlier handling mode</li>
+<li><code>count</code>: Total number of values contained in the histogram, excluding outliers</li>
+<li><code>lowerOutlierCount</code>: Count of outlier values below <code>lowerLimit</code>. Only used if the outlier mode is <code>overflow</code>.</li>
+<li><code>upperOutlierCount</code>: Count of outlier values above <code>upperLimit</code>. Only used if the outlier mode is <code>overflow</code>.</li>
+<li><code>missingValueCount</code>: Count of null values seen by the histogram.</li>
+<li><code>max</code>: Max value seen by the histogram. This does not include outlier values.</li>
+<li><code>min</code>: Min value seen by the histogram. This does not include outlier values.</li>
+<li><code>histogram</code>: An array of longs with size <code>numBuckets</code>, containing the bucket counts</li>
+</ul>
+<h3><a class="anchor" aria-hidden="true" id="ingesting-existing-histograms"></a><a href="#ingesting-existing-histograms" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Ingesting existing histograms</h3>
+<p>It is also possible to ingest existing fixed buckets histograms. The input must be a Base64 string encoding a byte array that contains a serialized histogram object. Both &quot;full&quot; and &quot;sparse&quot; formats can be used. Please see <a href="#serialization-formats">Serialization formats</a> below for details.</p>
+<h3><a class="anchor" aria-hidden="true" id="serialization-formats"></a><a href="#serialization-formats" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Serialization formats</h3>
+<h4><a class="anchor" aria-hidden="true" id="full-serialization-format"></a><a href="#full-serialization-format" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Full serialization format</h4>
+<p>This format includes the full histogram bucket count array in the serialization format.</p>
+<pre><code class="hljs"><span class="hljs-attr">byte:</span> <span class="hljs-string">serialization</span> <span class="hljs-string">version,</span> <span class="hljs-string">must</span> <span class="hljs-string">be</span> <span class="hljs-number">0x01</span>
+<span class="hljs-attr">byte:</span> <span class="hljs-string">encoding</span> <span class="hljs-string">mode,</span> <span class="hljs-number">0x01</span> <span class="hljs-string">for</span> <span class="hljs-string">full</span>
+<span class="hljs-attr">double:</span> <span class="hljs-string">lowerLimit</span>
+<span class="hljs-attr">double:</span> <span class="hljs-string">upperLimit</span>
+<span class="hljs-attr">int:</span> <span class="hljs-string">numBuckets</span>
+<span class="hljs-attr">byte:</span> <span class="hljs-string">outlier</span> <span class="hljs-string">handling</span> <span class="hljs-string">mode</span> <span class="hljs-string">(0x00</span> <span class="hljs-string">for</span> <span class="hljs-string">`ignore`,</span> <span class="hljs-number">0x01</span> <span class="hljs-string">for</span> <span class="hljs-string">`overflow`,</span> <span class="hljs-string">and</span> <span class="hljs-number">0x02</span> <span class="hljs-string">for</span> <span class="hljs-string">`clip`)</span>
+<span class="hljs-attr">long:</span> <span class="hljs-string">count,</span> <span class="hljs-string">total</span> <span class="hljs-string">number</span> <span class="hljs-string">of</span> <span class="hljs-string">values</span> <span class="hljs-string">contained</span> <span class="hljs-string">in</span> <span class="hljs-string">the</span> <span class="hljs-string">histogram,</span> <span class="hljs-string">excluding</span> <span class="hljs-string">outliers</span>
+<span class="hljs-attr">long:</span> <span class="hljs-string">lowerOutlierCount</span>
+<span class="hljs-attr">long:</span> <span class="hljs-string">upperOutlierCount</span>
+<span class="hljs-attr">long:</span> <span class="hljs-string">missingValueCount</span>
+<span class="hljs-attr">double:</span> <span class="hljs-string">max</span>
+<span class="hljs-attr">double:</span> <span class="hljs-string">min</span>
+<span class="hljs-attr">array of longs:</span> <span class="hljs-string">bucket</span> <span class="hljs-string">counts</span> <span class="hljs-string">for</span> <span class="hljs-string">the</span> <span class="hljs-string">histogram</span>
+</code></pre>
+<h4><a class="anchor" aria-hidden="true" id="sparse-serialization-format"></a><a href="#sparse-serialization-format" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Sparse serialization format</h4>
+<p>This format represents the histogram bucket counts as (bucketNum, count) pairs. This serialization format is used when less than half of the histogram's buckets have values.</p>
+<pre><code class="hljs">byte: serialization <span class="hljs-keyword">version</span>, must <span class="hljs-keyword">be</span> <span class="hljs-number">0</span>x01
+byte: encoding <span class="hljs-keyword">mode</span>, <span class="hljs-number">0</span>x02 <span class="hljs-keyword">for</span> sparse
+double: lowerLimit
+double: upperLimit
+in<span class="hljs-variable">t:</span> numBuckets
+byte: outlier handling <span class="hljs-keyword">mode</span> (<span class="hljs-number">0</span>x00 <span class="hljs-keyword">for</span> `ignore`, <span class="hljs-number">0</span>x01 <span class="hljs-keyword">for</span> `overflow`, <span class="hljs-built_in">and</span> <span class="hljs-number">0</span>x02 <span class="hljs-keyword">for</span> `clip`)
+lon<span class="hljs-variable">g:</span> <span class="hljs-built_in">count</span>, total <span class="hljs-keyword">number</span> of <span class="hljs-built_in">values</span> contained in the histogram, excluding outliers
+lon<span class="hljs-variable">g:</span> lowerOutlierCount
+lon<span class="hljs-variable">g:</span> upperOutlierCount
+lon<span class="hljs-variable">g:</span> missingValueCount
+double: <span class="hljs-built_in">max</span>
+double: <span class="hljs-built_in">min</span>
+in<span class="hljs-variable">t:</span> <span class="hljs-keyword">number</span> of following (bucketNum, <span class="hljs-built_in">count</span>) pairs
+sequence of (<span class="hljs-keyword">int</span>, long) pair<span class="hljs-variable">s:</span>
+  in<span class="hljs-variable">t:</span> bucket <span class="hljs-keyword">number</span>
+  coun<span class="hljs-variable">t:</span> bucket <span class="hljs-built_in">count</span>
+</code></pre>
+<h3><a class="anchor" aria-hidden="true" id="combining-histograms-with-different-bucketing-schemes"></a><a href="#combining-histograms-with-different-bucketing-schemes" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Combining histograms with different bucketing schemes</h3>
+<p>It is possible to combine two histograms with different bucketing schemes (lowerLimit, upperLimit, numBuckets) together.</p>
+<p>The bucketing scheme of the &quot;left hand&quot; histogram will be preserved (i.e., when running a query, the bucketing schemes specified in the query's histogram aggregators will be preserved).</p>
+<p>When merging, we assume that values are evenly distributed within the buckets of the &quot;right hand&quot; histogram.</p>
+<p>When the right-hand histogram contains outliers (when using <code>overflow</code> mode), we assume that all of the outliers counted in the right-hand histogram will be outliers in the left-hand histogram as well.</p>
+<p>For performance and accuracy reasons, we recommend avoiding aggregation of histograms with different bucketing schemes if possible.</p>
+<h3><a class="anchor" aria-hidden="true" id="null-handling"></a><a href="#null-handling" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Null handling</h3>
+<p>If <code>druid.generic.useDefaultValueForNull</code> is false, null values will be tracked in the <code>missingValueCount</code> field of the histogram.</p>
+<p>If <code>druid.generic.useDefaultValueForNull</code> is true, null values will be added to the histogram as the default 0.0 value.</p>
+<h2><a class="anchor" aria-hidden="true" id="histogram-post-aggregators"></a><a href="#histogram-post-aggregators" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Histogram post-aggregators</h2>
+<p>Post-aggregators are used to transform opaque approximate histogram sketches
+into bucketed histogram representations, as well as to compute various
+distribution metrics such as quantiles, min, and max.</p>
+<h3><a class="anchor" aria-hidden="true" id="equal-buckets-post-aggregator"></a><a href="#equal-buckets-post-aggregator" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Equal buckets post-aggregator</h3>
+<p>Computes a visual representation of the approximate histogram with a given number of equal-sized bins.
+Bucket intervals are based on the range of the underlying data. This aggregator is not supported for the fixed buckets histogram.</p>
+<pre><code class="hljs css language-json">{
+  <span class="hljs-attr">"type"</span>: <span class="hljs-string">"equalBuckets"</span>,
+  <span class="hljs-attr">"name"</span>: <span class="hljs-string">"&lt;output_name&gt;"</span>,
+  <span class="hljs-attr">"fieldName"</span>: <span class="hljs-string">"&lt;aggregator_name&gt;"</span>,
+  <span class="hljs-attr">"numBuckets"</span>: &lt;count&gt;
+}
+</code></pre>
+<h3><a class="anchor" aria-hidden="true" id="buckets-post-aggregator"></a><a href="#buckets-post-aggregator" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Buckets post-aggregator</h3>
+<p>Computes a visual representation given an initial breakpoint, offset, and a bucket size.</p>
+<p>Bucket size determines the width of the binning interval.</p>
+<p>Offset determines the value on which those interval bins align.</p>
+<p>This aggregator is not supported for the fixed buckets histogram.</p>
+<pre><code class="hljs css language-json">{
+  <span class="hljs-attr">"type"</span>: <span class="hljs-string">"buckets"</span>,
+  <span class="hljs-attr">"name"</span>: <span class="hljs-string">"&lt;output_name&gt;"</span>,
+  <span class="hljs-attr">"fieldName"</span>: <span class="hljs-string">"&lt;aggregator_name&gt;"</span>,
+  <span class="hljs-attr">"bucketSize"</span>: &lt;bucket_size&gt;,
+  <span class="hljs-attr">"offset"</span>: &lt;offset&gt;
+}
+</code></pre>
+<h3><a class="anchor" aria-hidden="true" id="custom-buckets-post-aggregator"></a><a href="#custom-buckets-post-aggregator" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Custom buckets post-aggregator</h3>
+<p>Computes a visual representation of the approximate histogram with bins laid out according to the given breaks.</p>
+<p>This aggregator is not supported for the fixed buckets histogram.</p>
+<pre><code class="hljs css language-json">{ <span class="hljs-attr">"type"</span> : <span class="hljs-string">"customBuckets"</span>, <span class="hljs-attr">"name"</span> : &lt;output_name&gt;, <span class="hljs-attr">"fieldName"</span> : &lt;aggregator_name&gt;,
+  <span class="hljs-attr">"breaks"</span> : [ &lt;value&gt;, &lt;value&gt;, ... ] }
+</code></pre>
+<h3><a class="anchor" aria-hidden="true" id="min-post-aggregator"></a><a href="#min-post-aggregator" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>min post-aggregator</h3>
+<p>Returns the minimum value of the underlying approximate or fixed buckets histogram aggregator</p>
+<pre><code class="hljs css language-json">{ <span class="hljs-attr">"type"</span> : <span class="hljs-string">"min"</span>, <span class="hljs-attr">"name"</span> : &lt;output_name&gt;, <span class="hljs-attr">"fieldName"</span> : &lt;aggregator_name&gt; }
+</code></pre>
+<h3><a class="anchor" aria-hidden="true" id="max-post-aggregator"></a><a href="#max-post-aggregator" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>max post-aggregator</h3>
+<p>Returns the maximum value of the underlying approximate or fixed buckets histogram aggregator</p>
+<pre><code class="hljs css language-json">{ <span class="hljs-attr">"type"</span> : <span class="hljs-string">"max"</span>, <span class="hljs-attr">"name"</span> : &lt;output_name&gt;, <span class="hljs-attr">"fieldName"</span> : &lt;aggregator_name&gt; }
+</code></pre>
+<h4><a class="anchor" aria-hidden="true" id="quantile-post-aggregator"></a><a href="#quantile-post-aggregator" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>quantile post-aggregator</h4>
+<p>Computes a single quantile based on the underlying approximate or fixed buckets histogram aggregator</p>
+<pre><code class="hljs css language-json">{ <span class="hljs-attr">"type"</span> : <span class="hljs-string">"quantile"</span>, <span class="hljs-attr">"name"</span> : &lt;output_name&gt;, <span class="hljs-attr">"fieldName"</span> : &lt;aggregator_name&gt;,
+  <span class="hljs-attr">"probability"</span> : &lt;quantile&gt; }
+</code></pre>
+<h4><a class="anchor" aria-hidden="true" id="quantiles-post-aggregator"></a><a href="#quantiles-post-aggregator" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>quantiles post-aggregator</h4>
+<p>Computes an array of quantiles based on the underlying approximate or fixed buckets histogram aggregator</p>
+<pre><code class="hljs css language-json">{ <span class="hljs-attr">"type"</span> : <span class="hljs-string">"quantiles"</span>, <span class="hljs-attr">"name"</span> : &lt;output_name&gt;, <span class="hljs-attr">"fieldName"</span> : &lt;aggregator_name&gt;,
+  <span class="hljs-attr">"probabilities"</span> : [ &lt;quantile&gt;, &lt;quantile&gt;, ... ] }
+</code></pre>
+</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/0.20.0/design/peons.html"><span class="arrow-prev">← </span><span>Peons</span></a><a class="docs-next button" href="/docs/0.20.0/development/extensions-core/avro.html"><span>Apache Avro</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#approximate-histogram-aggregator-deprecated">Approximate Histogram aggregator (Deprecated)</a><ul class="toc-headings"><li><a href="#creating-approximate-histogram-sketches-at-ingestion-time">Creating approximate histogram sketches at ingestion time</a></li></ul></li><li><a href="#fixed-buckets-histogram">Fixed Buckets Histogram</a><ul class="toc-headings"><li><a href="#when-to-use">When to use</a></li><li><a href="#properties">Properties</a></li><li><a href="#outlier-handling-modes">Outlier handling modes</a></li><li><a href="#output-fields">Output fields</a></li><li><a href="#ingesting-existing-histograms">Ingesting existing histograms</a></li><li><a href="#serialization-formats">Serialization formats</a></li><li><a href="#combining-histograms-with-different-bucketing-schemes">Combining histograms with different bucketing schemes</a></li><li><a href="#null-handling">Null handling</a></li></ul></li><li><a href="#histogram-post-aggregators">Histogram post-aggregators</a><ul class="toc-headings"><li><a href="#equal-buckets-post-aggregator">Equal buckets post-aggregator</a></li><li><a href="#buckets-post-aggregator">Buckets post-aggregator</a></li><li><a href="#custom-buckets-post-aggregator">Custom buckets post-aggregator</a></li><li><a href="#min-post-aggregator">min post-aggregator</a></li><li><a href="#max-post-aggregator">max post-aggregator</a></li></ul></li></ul></nav></div><footer class="nav-footer druid-footer" id="footer"><div class="container"><div class="text-center"><p><a href="/technology">Technology</a> · <a href="/use-cases">Use Cases</a> · <a href="/druid-powered">Powered by Druid</a> · <a href="/docs/0.20.0/latest">Docs</a> · <a href="/community/">Community</a> · <a href="/downloads.html">Download</a> · <a href="/faq">FAQ</a></p></div><div class="text-center"><a title="Join the user group" href="https://groups.google.com/forum/#!forum/druid-user" target="_blank"><span class="fa fa-comments"></span></a> · <a title="Follow Druid" href="https://twitter.com/druidio" target="_blank"><span class="fab fa-twitter"></span></a> · <a title="Download via Apache" href="https://www.apache.org/dyn/closer.cgi?path=/incubator/druid/{{ site.druid_versions[0].versions[0].version }}/apache-druid-{{ site.druid_versions[0].versions[0].version }}-bin.tar.gz" target="_blank"><span class="fas fa-feather"></span></a> · <a title="GitHub" href="https://github.com/apache/druid" target="_blank"><span class="fab fa-github"></span></a></div><div class="text-center license">Copyright © 2019 <a href="https://www.apache.org/" target="_blank">Apache Software Foundation</a>.<br/>Except where otherwise noted, licensed under <a rel="license" href="http://creativecommons.org/licenses/by-sa/4.0/">CC BY-SA 4.0</a>.<br/>Apache Druid, Druid, and the Druid logo are either registered trademarks or trademarks of The Apache Software Foundation in the United States and other countries.</div></div></footer></div><script type="text/javascript" src="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.js"></script><script>
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+<h2><a class="anchor" aria-hidden="true" id="avro-extension"></a><a href="#avro-extension" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Avro extension</h2>
+<p>This Apache Druid extension enables Druid to ingest and understand the Apache Avro data format. This extension provides
+two Avro Parsers for stream ingestion and Hadoop batch ingestion.
+See <a href="/docs/0.20.0/ingestion/data-formats.html#avro-hadoop-parser">Avro Hadoop Parser</a> and <a href="/docs/0.20.0/ingestion/data-formats.html#avro-stream-parser">Avro Stream Parser</a>
+for more details about how to use these in an ingestion spec.</p>
+<p>Make sure to <a href="/docs/0.20.0/development/extensions.html#loading-extensions">include</a> <code>druid-avro-extensions</code> as an extension.</p>
+</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/0.20.0/development/extensions-core/approximate-histograms.html"><span class="arrow-prev">← </span><span>Approximate Histogram aggregators</span></a><a class="docs-next button" href="/docs/0.20.0/development/extensions-core/azure.html"><span>Microsoft Azure</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#avro-extension">Avro extension</a></li></ul></nav></div><footer class="nav-footer druid-footer" id="footer"><div class="container"><div class="text-center"><p><a href="/technology">Technology</a> · <a href="/use-cases">Use Cases</a> · <a href="/druid-powered">Powered by Druid</a> · <a href="/docs/0.20.0/latest">Docs</a> · <a href="/community/">Community</a> · <a href="/downloads.html">Download</a> · <a href="/faq">FAQ</a></p></div><div class="text-center"><a title="Join the user group" href="https://groups.google.com/forum/#!forum/druid-user" target="_blank"><span class="fa fa-comments"></span></a> · <a title="Follow Druid" href="https://twitter.com/druidio" target="_blank"><span class="fab fa-twitter"></span></a> · <a title="Download via Apache" href="https://www.apache.org/dyn/closer.cgi?path=/incubator/druid/{{ site.druid_versions[0].versions[0].version }}/apache-druid-{{ site.druid_versions[0].versions[0].version }}-bin.tar.gz" target="_blank"><span class="fas fa-feather"></span></a> · <a title="GitHub" href="https://github.com/apache/druid" target="_blank"><span class="fab fa-github"></span></a></div><div class="text-center license">Copyright © 2019 <a href="https://www.apache.org/" target="_blank">Apache Software Foundation</a>.<br/>Except where otherwise noted, licensed under <a rel="license" href="http://creativecommons.org/licenses/by-sa/4.0/">CC BY-SA 4.0</a>.<br/>Apache Druid, Druid, and the Druid logo are either registered trademarks or trademarks of The Apache Software Foundation in the United States and other countries.</div></div></footer></div><script type="text/javascript" src="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.js"></script><script>
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+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Microsoft Azure · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/0.20.0/development/extensions-core/azure.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.20.0" /><meta property="og:title" content="Microsoft Azure · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
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+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
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+  -->
+<p>To use this Apache Druid extension, make sure to <a href="/docs/0.20.0/development/extensions.html#loading-extensions">include</a> <code>druid-azure-extensions</code> extension.</p>
+<h2><a class="anchor" aria-hidden="true" id="deep-storage"></a><a href="#deep-storage" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Deep Storage</h2>
+<p><a href="http://azure.microsoft.com/en-us/services/storage/">Microsoft Azure Storage</a> is another option for deep storage. This requires some additional Druid configuration.</p>
+<table>
+<thead>
+<tr><th>Property</th><th>Description</th><th>Possible Values</th><th>Default</th></tr>
+</thead>
+<tbody>
+<tr><td><code>druid.storage.type</code></td><td>azure</td><td></td><td>Must be set.</td></tr>
+<tr><td><code>druid.azure.account</code></td><td></td><td>Azure Storage account name.</td><td>Must be set.</td></tr>
+<tr><td><code>druid.azure.key</code></td><td></td><td>Azure Storage account key.</td><td>Must be set.</td></tr>
+<tr><td><code>druid.azure.container</code></td><td></td><td>Azure Storage container name.</td><td>Must be set.</td></tr>
+<tr><td><code>druid.azure.prefix</code></td><td>A prefix string that will be prepended to the blob names for the segments published to Azure deep storage</td><td></td><td>&quot;&quot;</td></tr>
+<tr><td><code>druid.azure.protocol</code></td><td>the protocol to use</td><td>http or https</td><td>https</td></tr>
+<tr><td><code>druid.azure.maxTries</code></td><td>Number of tries before canceling an Azure operation.</td><td></td><td>3</td></tr>
+<tr><td><code>druid.azure.maxListingLength</code></td><td>maximum number of input files matching a given prefix to retrieve at a time</td><td></td><td>1024</td></tr>
+</tbody>
+</table>
+<p>See <a href="http://azure.microsoft.com/en-us/pricing/free-trial/">Azure Services</a> for more information.</p>
+</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/0.20.0/development/extensions-core/avro.html"><span class="arrow-prev">← </span><span>Apache Avro</span></a><a class="docs-next button" href="/docs/0.20.0/development/extensions-core/bloom-filter.html"><span>Bloom Filter</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#deep-storage">Deep Storage</a></li></ul></nav></div><footer class="nav-footer druid-footer" id="footer"><div class="container"><div class="text-center"><p><a href="/technology">Technology</a> · <a href="/use-cases">Use Cases</a> · <a href="/druid-powered">Powered by Druid</a> · <a href="/docs/0.20.0/latest">Docs</a> · <a href="/community/">Community</a> · <a href="/downloads.html">Download</a> · <a href="/faq">FAQ</a></p></div><div class="text-center"><a title="Join the user group" href="https://groups.google.com/forum/#!forum/druid-user" target="_blank"><span class="fa fa-comments"></span></a> · <a title="Follow Druid" href="https://twitter.com/druidio" target="_blank"><span class="fab fa-twitter"></span></a> · <a title="Download via Apache" href="https://www.apache.org/dyn/closer.cgi?path=/incubator/druid/{{ site.druid_versions[0].versions[0].version }}/apache-druid-{{ site.druid_versions[0].versions[0].version }}-bin.tar.gz" target="_blank"><span class="fas fa-feather"></span></a> · <a title="GitHub" href="https://github.com/apache/druid" target="_blank"><span class="fab fa-github"></span></a></div><div class="text-center license">Copyright © 2019 <a href="https://www.apache.org/" target="_blank">Apache Software Foundation</a>.<br/>Except where otherwise noted, licensed under <a rel="license" href="http://creativecommons.org/licenses/by-sa/4.0/">CC BY-SA 4.0</a>.<br/>Apache Druid, Druid, and the Druid logo are either registered trademarks or trademarks of The Apache Software Foundation in the United States and other countries.</div></div></footer></div><script type="text/javascript" src="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.js"></script><script>
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+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Bloom Filter · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/0.20.0/development/extensions-core/bloom-filter.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.20.0" /><meta property="og:title" content="Bloom Filter · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
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+        </script></nav></div><div class="container mainContainer docsContainer"><div class="wrapper"><div class="post"><header class="postHeader"><a class="edit-page-link button" href="https://github.com/apache/druid/edit/master/docs/development/extensions-core/bloom-filter.md" target="_blank" rel="noreferrer noopener">Edit</a><h1 id="__docusaurus" class="postHeaderTitle">Bloom Filter</h1></header><article><div><span><!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
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+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+  -->
+<p>This Apache Druid extension adds the ability to both construct bloom filters from query results, and filter query results by testing
+against a bloom filter. Make sure to <a href="/docs/0.20.0/development/extensions.html#loading-extensions">include</a> <code>druid-bloom-filter</code> as an
+extension.</p>
+<p>A Bloom filter is a probabilistic data structure for performing a set membership check. A bloom filter is a good candidate
+to use with Druid for cases where an explicit filter is impossible, e.g. filtering a query against a set of millions of
+values.</p>
+<p>Following are some characteristics of Bloom filters:</p>
+<ul>
+<li>Bloom filters are highly space efficient when compared to using a HashSet.</li>
+<li>Because of the probabilistic nature of bloom filters, false positive results are possible (element was not actually
+inserted into a bloom filter during construction, but <code>test()</code> says true)</li>
+<li>False negatives are not possible (if element is present then <code>test()</code> will never say false).</li>
+<li>The false positive probability of this implementation is currently fixed at 5%, but increasing the number of entries
+that the filter can hold can decrease this false positive rate in exchange for overall size.</li>
+<li>Bloom filters are sensitive to number of elements that will be inserted in the bloom filter. During the creation of bloom filter expected number of entries must be specified. If the number of insertions exceed
+the specified initial number of entries then false positive probability will increase accordingly.</li>
+</ul>
+<p>This extension is currently based on <code>org.apache.hive.common.util.BloomKFilter</code> from <code>hive-storage-api</code>. Internally,
+this implementation uses Murmur3 as the hash algorithm.</p>
+<p>To construct a BloomKFilter externally with Java to use as a filter in a Druid query:</p>
+<pre><code class="hljs css language-java">BloomKFilter bloomFilter = <span class="hljs-keyword">new</span> BloomKFilter(<span class="hljs-number">1500</span>);
+bloomFilter.addString(<span class="hljs-string">"value 1"</span>);
+bloomFilter.addString(<span class="hljs-string">"value 2"</span>);
+bloomFilter.addString(<span class="hljs-string">"value 3"</span>);
+ByteArrayOutputStream byteArrayOutputStream = <span class="hljs-keyword">new</span> ByteArrayOutputStream();
+BloomKFilter.serialize(byteArrayOutputStream, bloomFilter);
+String base64Serialized = Base64.encodeBase64String(byteArrayOutputStream.toByteArray());
+</code></pre>
+<p>This string can then be used in the native or SQL Druid query.</p>
+<h2><a class="anchor" aria-hidden="true" id="filtering-queries-with-a-bloom-filter"></a><a href="#filtering-queries-with-a-bloom-filter" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Filtering queries with a Bloom Filter</h2>
+<h3><a class="anchor" aria-hidden="true" id="json-specification-of-bloom-filter"></a><a href="#json-specification-of-bloom-filter" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>JSON Specification of Bloom Filter</h3>
+<pre><code class="hljs css language-json">{
+  <span class="hljs-attr">"type"</span> : <span class="hljs-string">"bloom"</span>,
+  <span class="hljs-attr">"dimension"</span> : &lt;dimension_name&gt;,
+  <span class="hljs-attr">"bloomKFilter"</span> : &lt;serialized_bytes_for_BloomKFilter&gt;,
+  <span class="hljs-attr">"extractionFn"</span> : &lt;extraction_fn&gt;
+}
+</code></pre>
+<table>
+<thead>
+<tr><th>Property</th><th>Description</th><th>required?</th></tr>
+</thead>
+<tbody>
+<tr><td><code>type</code></td><td>Filter Type. Should always be <code>bloom</code></td><td>yes</td></tr>
+<tr><td><code>dimension</code></td><td>The dimension to filter over.</td><td>yes</td></tr>
+<tr><td><code>bloomKFilter</code></td><td>Base64 encoded Binary representation of <code>org.apache.hive.common.util.BloomKFilter</code></td><td>yes</td></tr>
+<tr><td><code>extractionFn</code></td><td><a href="../../querying/dimensionspecs.html#extraction-functions">Extraction function</a> to apply to the dimension values</td><td>no</td></tr>
+</tbody>
+</table>
+<h3><a class="anchor" aria-hidden="true" id="serialized-format-for-bloomkfilter"></a><a href="#serialized-format-for-bloomkfilter" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Serialized Format for BloomKFilter</h3>
+<p>Serialized BloomKFilter format:</p>
+<ul>
+<li>1 byte for the number of hash functions.</li>
+<li>1 big endian int(That is how OutputStream works) for the number of longs in the bitset</li>
+<li>big endian longs in the BloomKFilter bitset</li>
+</ul>
+<p>Note: <code>org.apache.hive.common.util.BloomKFilter</code> provides a serialize method which can be used to serialize bloom filters to outputStream.</p>
+<h3><a class="anchor" aria-hidden="true" id="filtering-sql-queries"></a><a href="#filtering-sql-queries" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Filtering SQL Queries</h3>
+<p>Bloom filters can be used in SQL <code>WHERE</code> clauses via the <code>bloom_filter_test</code> operator:</p>
+<pre><code class="hljs css language-sql"><span class="hljs-keyword">SELECT</span> <span class="hljs-keyword">COUNT</span>(*) <span class="hljs-keyword">FROM</span> druid.foo <span class="hljs-keyword">WHERE</span> bloom_filter_test(&lt;expr&gt;, <span class="hljs-string">'&lt;serialized_bytes_for_BloomKFilter&gt;'</span>)
+</code></pre>
+<h3><a class="anchor" aria-hidden="true" id="expression-and-virtual-column-support"></a><a href="#expression-and-virtual-column-support" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Expression and Virtual Column Support</h3>
+<p>The bloom filter extension also adds a bloom filter <a href="/docs/0.20.0/misc/math-expr.html">Druid expression</a> which shares syntax
+with the SQL operator.</p>
+<pre><code class="hljs css language-sql">bloom_filter_test(&lt;expr&gt;, '&lt;serialized_bytes_for_BloomKFilter&gt;')
+</code></pre>
+<h2><a class="anchor" aria-hidden="true" id="bloom-filter-query-aggregator"></a><a href="#bloom-filter-query-aggregator" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Bloom Filter Query Aggregator</h2>
+<p>Input for a <code>bloomKFilter</code> can also be created from a druid query with the <code>bloom</code> aggregator. Note that it is very
+important to set a reasonable value for the <code>maxNumEntries</code> parameter, which is the maximum number of distinct entries
+that the bloom filter can represent without increasing the false positive rate. It may be worth performing a query using
+one of the unique count sketches to calculate the value for this parameter in order to build a bloom filter appropriate
+for the query.</p>
+<h3><a class="anchor" aria-hidden="true" id="json-specification-of-bloom-filter-aggregator"></a><a href="#json-specification-of-bloom-filter-aggregator" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>JSON Specification of Bloom Filter Aggregator</h3>
+<pre><code class="hljs css language-json">{
+      <span class="hljs-attr">"type"</span>: <span class="hljs-string">"bloom"</span>,
+      <span class="hljs-attr">"name"</span>: &lt;output_field_name&gt;,
+      <span class="hljs-attr">"maxNumEntries"</span>: &lt;maximum_number_of_elements_for_BloomKFilter&gt;
+      <span class="hljs-string">"field"</span>: &lt;dimension_spec&gt;
+    }
+</code></pre>
+<table>
+<thead>
+<tr><th>Property</th><th>Description</th><th>required?</th></tr>
+</thead>
+<tbody>
+<tr><td><code>type</code></td><td>Aggregator Type. Should always be <code>bloom</code></td><td>yes</td></tr>
+<tr><td><code>name</code></td><td>Output field name</td><td>yes</td></tr>
+<tr><td><code>field</code></td><td><a href="/docs/0.20.0/querying/dimensionspecs.html">DimensionSpec</a> to add to <code>org.apache.hive.common.util.BloomKFilter</code></td><td>yes</td></tr>
+<tr><td><code>maxNumEntries</code></td><td>Maximum number of distinct values supported by <code>org.apache.hive.common.util.BloomKFilter</code>, default <code>1500</code></td><td>no</td></tr>
+</tbody>
+</table>
+<h3><a class="anchor" aria-hidden="true" id="example"></a><a href="#example" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Example</h3>
+<pre><code class="hljs css language-json">{
+  <span class="hljs-attr">"queryType"</span>: <span class="hljs-string">"timeseries"</span>,
+  <span class="hljs-attr">"dataSource"</span>: <span class="hljs-string">"wikiticker"</span>,
+  <span class="hljs-attr">"intervals"</span>: [ <span class="hljs-string">"2015-09-12T00:00:00.000/2015-09-13T00:00:00.000"</span> ],
+  <span class="hljs-attr">"granularity"</span>: <span class="hljs-string">"day"</span>,
+  <span class="hljs-attr">"aggregations"</span>: [
+    {
+      <span class="hljs-attr">"type"</span>: <span class="hljs-string">"bloom"</span>,
+      <span class="hljs-attr">"name"</span>: <span class="hljs-string">"userBloom"</span>,
+      <span class="hljs-attr">"maxNumEntries"</span>: <span class="hljs-number">100000</span>,
+      <span class="hljs-attr">"field"</span>: {
+        <span class="hljs-attr">"type"</span>:<span class="hljs-string">"default"</span>,
+        <span class="hljs-attr">"dimension"</span>:<span class="hljs-string">"user"</span>,
+        <span class="hljs-attr">"outputType"</span>: <span class="hljs-string">"STRING"</span>
+      }
+    }
+  ]
+}
+</code></pre>
+<p>response</p>
+<pre><code class="hljs css language-json">[{<span class="hljs-attr">"timestamp"</span>:<span class="hljs-string">"2015-09-12T00:00:00.000Z"</span>,<span class="hljs-attr">"result"</span>:{<span class="hljs-attr">"userBloom"</span>:<span class="hljs-string">"BAAAJhAAAA..."</span>}}]
+</code></pre>
+<p>These values can then be set in the filter specification described above.</p>
+<p>Ordering results by a bloom filter aggregator, for example in a TopN query, will perform a comparatively expensive
+linear scan <em>of the filter itself</em> to count the number of set bits as a means of approximating how many items have been
+added to the set. As such, ordering by an alternate aggregation is recommended if possible.</p>
+<h3><a class="anchor" aria-hidden="true" id="sql-bloom-filter-aggregator"></a><a href="#sql-bloom-filter-aggregator" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>SQL Bloom Filter Aggregator</h3>
+<p>Bloom filters can be computed in SQL expressions with the <code>bloom_filter</code> aggregator:</p>
+<pre><code class="hljs css language-sql"><span class="hljs-keyword">SELECT</span> BLOOM_FILTER(&lt;expression&gt;, &lt;<span class="hljs-keyword">max</span> <span class="hljs-built_in">number</span> <span class="hljs-keyword">of</span> entries&gt;) <span class="hljs-keyword">FROM</span> druid.foo <span class="hljs-keyword">WHERE</span> dim2 = <span class="hljs-string">'abc'</span>
+</code></pre>
+<p>but requires the setting <code>druid.sql.planner.serializeComplexValues</code> to be set to <code>true</code>. Bloom filter results in a SQL
+response are serialized into a base64 string, which can then be used in subsequent queries as a filter.</p>
+</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/0.20.0/development/extensions-core/azure.html"><span class="arrow-prev">← </span><span>Microsoft Azure</span></a><a class="docs-next button" href="/docs/0.20.0/development/extensions-core/datasketches-extension.html"><span class="function-name-prevnext">DataSketches extension</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#filtering-queries-with-a-bloom-filter">Filtering queries with a Bloom Filter</a><ul class="toc-headings"><li><a href="#json-specification-of-bloom-filter">JSON Specification of Bloom Filter</a></li><li><a href="#serialized-format-for-bloomkfilter">Serialized Format for BloomKFilter</a></li><li><a href="#filtering-sql-queries">Filtering SQL Queries</a></li><li><a href="#expression-and-virtual-column-support">Expression and Virtual Column Support</a></li></ul></li><li><a href="#bloom-filter-query-aggregator">Bloom Filter Query Aggregator</a><ul class="toc-headings"><li><a href="#json-specification-of-bloom-filter-aggregator">JSON Specification of Bloom Filter Aggregator</a></li><li><a href="#example">Example</a></li><li><a href="#sql-bloom-filter-aggregator">SQL Bloom Filter Aggregator</a></li></ul></li></ul></nav></div><footer class="nav-footer druid-footer" id="footer"><div class="container"><div class="text-center"><p><a href="/technology">Technology</a> · <a href="/use-cases">Use Cases</a> · <a href="/druid-powered">Powered by Druid</a> · <a href="/docs/0.20.0/latest">Docs</a> · <a href="/community/">Community</a> · <a href="/downloads.html">Download</a> · <a href="/faq">FAQ</a></p></div><div class="text-center"><a title="Join the user group" href="https://groups.google.com/forum/#!forum/druid-user" target="_blank"><span class="fa fa-comments"></span></a> · <a title="Follow Druid" href="https://twitter.com/druidio" target="_blank"><span class="fab fa-twitter"></span></a> · <a title="Download via Apache" href="https://www.apache.org/dyn/closer.cgi?path=/incubator/druid/{{ site.druid_versions[0].versions[0].version }}/apache-druid-{{ site.druid_versions[0].versions[0].version }}-bin.tar.gz" target="_blank"><span class="fas fa-feather"></span></a> · <a title="GitHub" href="https://github.com/apache/druid" target="_blank"><span class="fab fa-github"></span></a></div><div class="text-center license">Copyright © 2019 <a href="https://www.apache.org/" target="_blank">Apache Software Foundation</a>.<br/>Except where otherwise noted, licensed under <a rel="license" href="http://creativecommons.org/licenses/by-sa/4.0/">CC BY-SA 4.0</a>.<br/>Apache Druid, Druid, and the Druid logo are either registered trademarks or trademarks of The Apache Software Foundation in the United States and other countries.</div></div></footer></div><script type="text/javascript" src="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.js"></script><script>
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+<p>Apache Druid aggregators based on <a href="https://datasketches.apache.org/">Apache DataSketches</a> library. Sketches are data structures implementing approximate streaming mergeable algorithms. Sketches can be ingested from the outside of Druid or built from raw data at ingestion time. Sketches can be stored in Druid segments as additive metrics.</p>
+<p>To use the datasketches aggregators, make sure you <a href="/docs/0.20.0/development/extensions.html#loading-extensions">include</a> the extension in your config file:</p>
+<pre><code class="hljs"><span class="hljs-attr">druid.extensions.loadList</span>=[<span class="hljs-string">"druid-datasketches"</span>]
+</code></pre>
+<p>The following modules are available:</p>
+<ul>
+<li><a href="datasketches-theta.html">Theta sketch</a> - approximate distinct counting with set operations (union, intersection and set difference).</li>
+<li><a href="datasketches-tuple.html">Tuple sketch</a> - extension of Theta sketch to support values associated with distinct keys (arrays of numeric values in this specialized implementation).</li>
+<li><a href="datasketches-quantiles.html">Quantiles sketch</a> - approximate distribution of comparable values to obtain ranks, quantiles and histograms. This is a specialized implementation for numeric values.</li>
+<li><a href="datasketches-hll.html">HLL sketch</a> - approximate distinct counting using very compact HLL sketch.</li>
+</ul>
+</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/0.20.0/development/extensions-core/bloom-filter.html"><span class="arrow-prev">← </span><span>Bloom Filter</span></a><a class="docs-next button" href="/docs/0.20.0/development/extensions-core/datasketches-hll.html"><span class="function-name-prevnext">DataSketches HLL Sketch module</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"></nav></div><footer class="nav-footer druid-footer" id="footer"><div class="container"><div class="text-center"><p><a href="/technology">Technology</a> · <a href="/use-cases">Use Cases</a> · <a href="/druid-powered">Powered by Druid</a> · <a href="/docs/0.20.0/latest">Docs</a> · <a href="/community/">Community</a> · <a href="/downloads.html">Download</a> · <a href="/faq">FAQ</a></p></div><div class="text-center"><a title="Join the user group" href="https://groups.google.com/forum/#!forum/druid-user" target="_blank"><span class="fa fa-comments"></span></a> · <a title="Follow Druid" href="https://twitter.com/druidio" target="_blank"><span class="fab fa-twitter"></span></a> · <a title="Download via Apache" href="https://www.apache.org/dyn/closer.cgi?path=/incubator/druid/{{ site.druid_versions[0].versions[0].version }}/apache-druid-{{ site.druid_versions[0].versions[0].version }}-bin.tar.gz" target="_blank"><span class="fas fa-feather"></span></a> · <a title="GitHub" href="https://github.com/apache/druid" target="_blank"><span class="fab fa-github"></span></a></div><div class="text-center license">Copyright © 2019 <a href="https://www.apache.org/" target="_blank">Apache Software Foundation</a>.<br/>Except where otherwise noted, licensed under <a rel="license" href="http://creativecommons.org/licenses/by-sa/4.0/">CC BY-SA 4.0</a>.<br/>Apache Druid, Druid, and the Druid logo are either registered trademarks or trademarks of The Apache Software Foundation in the United States and other countries.</div></div></footer></div><script type="text/javascript" src="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.js"></script><script>
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+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
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+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
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+  -->
+<p>This module provides Apache Druid aggregators for distinct counting based on HLL sketch from <a href="https://datasketches.apache.org/">Apache DataSketches</a> library. At ingestion time, this aggregator creates the HLL sketch objects to be stored in Druid segments. At query time, sketches are read and merged together. In the end, by default, you receive the estimate of the number of distinct values presented to the sketch. Also, you can use post aggregator to produce a union of sketch columns in the same row.
+You can use the HLL sketch aggregator on columns of any identifiers. It will return estimated cardinality of the column.</p>
+<p>To use this aggregator, make sure you <a href="/docs/0.20.0/development/extensions.html#loading-extensions">include</a> the extension in your config file:</p>
+<pre><code class="hljs"><span class="hljs-attr">druid.extensions.loadList</span>=[<span class="hljs-string">"druid-datasketches"</span>]
+</code></pre>
+<h3><a class="anchor" aria-hidden="true" id="aggregators"></a><a href="#aggregators" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Aggregators</h3>
+<pre><code class="hljs">{
+  <span class="hljs-attr">"type"</span> : <span class="hljs-string">"HLLSketchBuild"</span>,
+  <span class="hljs-attr">"name"</span> : &lt;output name&gt;,
+  <span class="hljs-attr">"fieldName"</span> : &lt;metric name&gt;,
+  <span class="hljs-attr">"lgK"</span> : &lt;size and accuracy parameter&gt;,
+  <span class="hljs-attr">"tgtHllType"</span> : &lt;target HLL type&gt;,
+  <span class="hljs-attr">"round"</span>: &lt;<span class="hljs-literal">false</span> | <span class="hljs-literal">true</span>&gt;
+ }
+</code></pre>
+<pre><code class="hljs">{
+  <span class="hljs-attr">"type"</span> : <span class="hljs-string">"HLLSketchMerge"</span>,
+  <span class="hljs-attr">"name"</span> : &lt;output name&gt;,
+  <span class="hljs-attr">"fieldName"</span> : &lt;metric name&gt;,
+  <span class="hljs-attr">"lgK"</span> : &lt;size and accuracy parameter&gt;,
+  <span class="hljs-attr">"tgtHllType"</span> : &lt;target HLL type&gt;,
+  <span class="hljs-attr">"round"</span>: &lt;<span class="hljs-literal">false</span> | <span class="hljs-literal">true</span>&gt;
+ }
+</code></pre>
+<table>
+<thead>
+<tr><th>property</th><th>description</th><th>required?</th></tr>
+</thead>
+<tbody>
+<tr><td>type</td><td>This String should be &quot;HLLSketchBuild&quot; or &quot;HLLSketchMerge&quot;</td><td>yes</td></tr>
+<tr><td>name</td><td>A String for the output (result) name of the calculation.</td><td>yes</td></tr>
+<tr><td>fieldName</td><td>A String for the name of the input field.</td><td>yes</td></tr>
+<tr><td>lgK</td><td>log2 of K that is the number of buckets in the sketch, parameter that controls the size and the accuracy. Must be a power of 2 from 4 to 21 inclusively.</td><td>no, defaults to 12</td></tr>
+<tr><td>tgtHllType</td><td>The type of the target HLL sketch. Must be &quot;HLL_4&quot;, &quot;HLL_6&quot; or &quot;HLL_8&quot;</td><td>no, defaults to &quot;HLL_4&quot;</td></tr>
+<tr><td>round</td><td>Round off values to whole numbers. Only affects query-time behavior and is ignored at ingestion-time.</td><td>no, defaults to false</td></tr>
+</tbody>
+</table>
+<h3><a class="anchor" aria-hidden="true" id="post-aggregators"></a><a href="#post-aggregators" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Post Aggregators</h3>
+<h4><a class="anchor" aria-hidden="true" id="estimate"></a><a href="#estimate" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Estimate</h4>
+<p>Returns the distinct count estimate as a double.</p>
+<pre><code class="hljs">{
+  <span class="hljs-string">"type"</span>  : <span class="hljs-string">"HLLSketchEstimate"</span>,
+  <span class="hljs-string">"name"</span>: &lt;output name&gt;,
+  <span class="hljs-string">"field"</span>  : &lt;post aggregator that returns an HLL Sketch&gt;,
+  <span class="hljs-string">"round"</span> : &lt;<span class="hljs-keyword">if</span> <span class="hljs-literal">true</span>, round the estimate.<span class="hljs-built_in"> Default </span>is <span class="hljs-literal">false</span>&gt;
+}
+</code></pre>
+<h4><a class="anchor" aria-hidden="true" id="estimate-with-bounds"></a><a href="#estimate-with-bounds" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Estimate with bounds</h4>
+<p>Returns a distinct count estimate and error bounds from an HLL sketch.
+The result will be an array containing three double values: estimate, lower bound and upper bound.
+The bounds are provided at a given number of standard deviations (optional, defaults to 1).
+This must be an integer value of 1, 2 or 3 corresponding to approximately 68.3%, 95.4% and 99.7% confidence intervals.</p>
+<pre><code class="hljs">{
+  <span class="hljs-string">"type"</span>  : <span class="hljs-string">"HLLSketchEstimateWithBounds"</span>,
+  <span class="hljs-string">"name"</span>: &lt;output <span class="hljs-built_in">name</span>&gt;,
+  <span class="hljs-string">"field"</span>  : &lt;post aggregator <span class="hljs-keyword">that</span> returns an HLL Sketch&gt;,
+  <span class="hljs-string">"numStdDev"</span> : &lt;<span class="hljs-built_in">number</span> <span class="hljs-keyword">of</span> standard deviations: <span class="hljs-number">1</span> (default), <span class="hljs-number">2</span> <span class="hljs-keyword">or</span> <span class="hljs-number">3</span>&gt;
+}
+</code></pre>
+<h4><a class="anchor" aria-hidden="true" id="union"></a><a href="#union" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Union</h4>
+<pre><code class="hljs">{
+  <span class="hljs-attr">"type"</span>  : <span class="hljs-string">"HLLSketchUnion"</span>,
+  <span class="hljs-attr">"name"</span>: &lt;output name&gt;,
+  <span class="hljs-attr">"fields"</span>  : &lt;array of post aggregators that return HLL sketches&gt;,
+  <span class="hljs-attr">"lgK"</span>: &lt;log2 of K for the target sketch&gt;,
+  <span class="hljs-attr">"tgtHllType"</span> : &lt;target HLL type&gt;
+}
+</code></pre>
+<h4><a class="anchor" aria-hidden="true" id="sketch-to-string"></a><a href="#sketch-to-string" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Sketch to string</h4>
+<p>Human-readable sketch summary for debugging.</p>
+<pre><code class="hljs">{
+  <span class="hljs-attr">"type"</span>  : <span class="hljs-string">"HLLSketchToString"</span>,
+  <span class="hljs-attr">"name"</span>: &lt;output name&gt;,
+  <span class="hljs-attr">"field"</span>  : &lt;post aggregator that returns an HLL Sketch&gt;
+}
+</code></pre>
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+  ~ Licensed to the Apache Software Foundation (ASF) under one
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+<p>This module provides Apache Druid aggregators based on numeric quantiles DoublesSketch from <a href="https://datasketches.apache.org/">Apache DataSketches</a> library. Quantiles sketch is a mergeable streaming algorithm to estimate the distribution of values, and approximately answer queries about the rank of a value, probability mass function of the distribution (PMF) or histogram, cumulative distribution function (CDF), and quantiles (median, min, max, 95th percentile and such). See <a href="https://datasketches.apache.org/docs/Quantiles/QuantilesOverview.html">Quantiles Sketch Overview</a>.</p>
+<p>There are three major modes of operation:</p>
+<ol>
+<li>Ingesting sketches built outside of Druid (say, with Pig or Hive)</li>
+<li>Building sketches from raw data during ingestion</li>
+<li>Building sketches from raw data at query time</li>
+</ol>
+<p>To use this aggregator, make sure you <a href="/docs/0.20.0/development/extensions.html#loading-extensions">include</a> the extension in your config file:</p>
+<pre><code class="hljs"><span class="hljs-attr">druid.extensions.loadList</span>=[<span class="hljs-string">"druid-datasketches"</span>]
+</code></pre>
+<h3><a class="anchor" aria-hidden="true" id="aggregator"></a><a href="#aggregator" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Aggregator</h3>
+<p>The result of the aggregation is a DoublesSketch that is the union of all sketches either built from raw data or read from the segments.</p>
+<pre><code class="hljs css language-json">{
+  <span class="hljs-attr">"type"</span> : <span class="hljs-string">"quantilesDoublesSketch"</span>,
+  <span class="hljs-attr">"name"</span> : &lt;output_name&gt;,
+  <span class="hljs-attr">"fieldName"</span> : &lt;metric_name&gt;,
+  <span class="hljs-attr">"k"</span>: &lt;parameter that controls size and accuracy&gt;
+ }
+</code></pre>
+<table>
+<thead>
+<tr><th>property</th><th>description</th><th>required?</th></tr>
+</thead>
+<tbody>
+<tr><td>type</td><td>This String should always be &quot;quantilesDoublesSketch&quot;</td><td>yes</td></tr>
+<tr><td>name</td><td>A String for the output (result) name of the calculation.</td><td>yes</td></tr>
+<tr><td>fieldName</td><td>A String for the name of the input field (can contain sketches or raw numeric values).</td><td>yes</td></tr>
+<tr><td>k</td><td>Parameter that determines the accuracy and size of the sketch. Higher k means higher accuracy but more space to store sketches. Must be a power of 2 from 2 to 32768. See the <a href="https://datasketches.apache.org/docs/Quantiles/QuantilesAccuracy.html">Quantiles Accuracy</a> for details.</td><td>no, defaults to 128</td></tr>
+</tbody>
+</table>
+<h3><a class="anchor" aria-hidden="true" id="post-aggregators"></a><a href="#post-aggregators" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Post Aggregators</h3>
+<h4><a class="anchor" aria-hidden="true" id="quantile"></a><a href="#quantile" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Quantile</h4>
+<p>This returns an approximation to the value that would be preceded by a given fraction of a hypothetical sorted version of the input stream.</p>
+<pre><code class="hljs css language-json">{
+  "type"  : "quantilesDoublesSketchToQuantile",
+  "name": &lt;output name&gt;,
+  "field"  : &lt;post aggregator that refers to a DoublesSketch (fieldAccess or another post aggregator)&gt;,
+  "fraction" : &lt;fractional position in the hypothetical sorted stream, number from 0 to 1 inclusive&gt;
+}
+</code></pre>
+<h4><a class="anchor" aria-hidden="true" id="quantiles"></a><a href="#quantiles" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Quantiles</h4>
+<p>This returns an array of quantiles corresponding to a given array of fractions</p>
+<pre><code class="hljs css language-json">{
+  "type"  : "quantilesDoublesSketchToQuantiles",
+  "name": &lt;output name&gt;,
+  "field"  : &lt;post aggregator that refers to a DoublesSketch (fieldAccess or another post aggregator)&gt;,
+  "fractions" : &lt;array of fractional positions in the hypothetical sorted stream, number from 0 to 1 inclusive&gt;
+}
+</code></pre>
+<h4><a class="anchor" aria-hidden="true" id="histogram"></a><a href="#histogram" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Histogram</h4>
+<p>This returns an approximation to the histogram given an array of split points that define the histogram bins or a number of bins (not both). An array of <i>m</i> unique, monotonically increasing split points divide the real number line into <i>m+1</i> consecutive disjoint intervals. The definition of an interval is inclusive of the left split point and exclusive of the right split point. If the number of bins is specified instead of split points, the interval between the minimum and maximum values is divided into the given number of equally-spaced bins.</p>
+<pre><code class="hljs css language-json">{
+  "type"  : "quantilesDoublesSketchToHistogram",
+  "name": &lt;output name&gt;,
+  "field"  : &lt;post aggregator that refers to a DoublesSketch (fieldAccess or another post aggregator)&gt;,
+  "splitPoints" : &lt;array of split points (optional)&gt;,
+  "numBins" : &lt;number of bins (optional, defaults to 10)&gt;
+}
+</code></pre>
+<h4><a class="anchor" aria-hidden="true" id="rank"></a><a href="#rank" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Rank</h4>
+<p>This returns an approximation to the rank of a given value that is the fraction of the distribution less than that value.</p>
+<pre><code class="hljs css language-json">{
+  <span class="hljs-attr">"type"</span>  : <span class="hljs-string">"quantilesDoublesSketchToRank"</span>,
+  <span class="hljs-attr">"name"</span>: &lt;output name&gt;,
+  <span class="hljs-attr">"field"</span>  : &lt;post aggregator that refers to a DoublesSketch (fieldAccess or another post aggregator)&gt;,
+  <span class="hljs-attr">"value"</span> : &lt;value&gt;
+}
+</code></pre>
+<h4><a class="anchor" aria-hidden="true" id="cdf"></a><a href="#cdf" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>CDF</h4>
+<p>This returns an approximation to the Cumulative Distribution Function given an array of split points that define the edges of the bins. An array of <i>m</i> unique, monotonically increasing split points divide the real number line into <i>m+1</i> consecutive disjoint intervals. The definition of an interval is inclusive of the left split point and exclusive of the right split point. The resulting array of fractions can be viewed as ranks of each split point with one additional rank that is always 1.</p>
+<pre><code class="hljs css language-json">{
+  <span class="hljs-attr">"type"</span>  : <span class="hljs-string">"quantilesDoublesSketchToCDF"</span>,
+  <span class="hljs-attr">"name"</span>: &lt;output name&gt;,
+  <span class="hljs-attr">"field"</span>  : &lt;post aggregator that refers to a DoublesSketch (fieldAccess or another post aggregator)&gt;,
+  <span class="hljs-attr">"splitPoints"</span> : &lt;array of split points&gt;
+}
+</code></pre>
+<h4><a class="anchor" aria-hidden="true" id="sketch-summary"></a><a href="#sketch-summary" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Sketch Summary</h4>
+<p>This returns a summary of the sketch that can be used for debugging. This is the result of calling toString() method.</p>
+<pre><code class="hljs css language-json">{
+  <span class="hljs-attr">"type"</span>  : <span class="hljs-string">"quantilesDoublesSketchToString"</span>,
+  <span class="hljs-attr">"name"</span>: &lt;output name&gt;,
+  <span class="hljs-attr">"field"</span>  : &lt;post aggregator that refers to a DoublesSketch (fieldAccess or another post aggregator)&gt;
+}
+</code></pre>
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+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
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+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+  -->
+<p>This module provides Apache Druid aggregators based on Theta sketch from <a href="https://datasketches.apache.org/">Apache DataSketches</a> library. Note that sketch algorithms are approximate; see details in the &quot;Accuracy&quot; section of the datasketches doc.
+At ingestion time, this aggregator creates the Theta sketch objects which get stored in Druid segments. Logically speaking, a Theta sketch object can be thought of as a Set data structure. At query time, sketches are read and aggregated (set unioned) together. In the end, by default, you receive the estimate of the number of unique entries in the sketch object. Also, you can use post aggregators to do union, intersection or difference on sketch columns in the same row.
+Note that you can use <code>thetaSketch</code> aggregator on columns which were not ingested using the same. It will return estimated cardinality of the column. It is recommended to use it at ingestion time as well to make querying faster.</p>
+<p>To use this aggregator, make sure you <a href="/docs/0.20.0/development/extensions.html#loading-extensions">include</a> the extension in your config file:</p>
+<pre><code class="hljs"><span class="hljs-attr">druid.extensions.loadList</span>=[<span class="hljs-string">"druid-datasketches"</span>]
+</code></pre>
+<h3><a class="anchor" aria-hidden="true" id="aggregators"></a><a href="#aggregators" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Aggregators</h3>
+<pre><code class="hljs css language-json">{
+  <span class="hljs-attr">"type"</span> : <span class="hljs-string">"thetaSketch"</span>,
+  <span class="hljs-attr">"name"</span> : &lt;output_name&gt;,
+  <span class="hljs-attr">"fieldName"</span> : &lt;metric_name&gt;,
+  <span class="hljs-attr">"isInputThetaSketch"</span>: <span class="hljs-literal">false</span>,
+  <span class="hljs-attr">"size"</span>: <span class="hljs-number">16384</span>
+ }
+</code></pre>
+<table>
+<thead>
+<tr><th>property</th><th>description</th><th>required?</th></tr>
+</thead>
+<tbody>
+<tr><td>type</td><td>This String should always be &quot;thetaSketch&quot;</td><td>yes</td></tr>
+<tr><td>name</td><td>A String for the output (result) name of the calculation.</td><td>yes</td></tr>
+<tr><td>fieldName</td><td>A String for the name of the aggregator used at ingestion time.</td><td>yes</td></tr>
+<tr><td>isInputThetaSketch</td><td>This should only be used at indexing time if your input data contains theta sketch objects. This would be the case if you use datasketches library outside of Druid, say with Pig/Hive, to produce the data that you are ingesting into Druid</td><td>no, defaults to false</td></tr>
+<tr><td>size</td><td>Must be a power of 2. Internally, size refers to the maximum number of entries sketch object will retain. Higher size means higher accuracy but more space to store sketches. Note that after you index with a particular size, druid will persist sketch in segments and you will use size greater or equal to that at query time. See the <a href="https://datasketches.apache.org/docs/Theta/ThetaSize.html">DataSketches site</a> for details. In general, We recommend just sticking to default size.</td><td>no, defaults to 16384</td></tr>
+</tbody>
+</table>
+<h3><a class="anchor" aria-hidden="true" id="post-aggregators"></a><a href="#post-aggregators" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Post Aggregators</h3>
+<h4><a class="anchor" aria-hidden="true" id="sketch-estimator"></a><a href="#sketch-estimator" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Sketch Estimator</h4>
+<pre><code class="hljs css language-json">{
+  <span class="hljs-attr">"type"</span>  : <span class="hljs-string">"thetaSketchEstimate"</span>,
+  <span class="hljs-attr">"name"</span>: &lt;output name&gt;,
+  <span class="hljs-attr">"field"</span>  : &lt;post aggregator of type fieldAccess that refers to a thetaSketch aggregator or that of type thetaSketchSetOp&gt;
+}
+</code></pre>
+<h4><a class="anchor" aria-hidden="true" id="sketch-operations"></a><a href="#sketch-operations" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Sketch Operations</h4>
+<pre><code class="hljs css language-json">{
+  "type"  : "thetaSketchSetOp",
+  "name": &lt;output name&gt;,
+  "func": &lt;UNION|INTERSECT|NOT&gt;,
+  "fields"  : &lt;array of fieldAccess type post aggregators to access the thetaSketch aggregators or thetaSketchSetOp type post aggregators to allow arbitrary combination of set operations&gt;,
+  "size": &lt;16384 by default, must be max of size from sketches in fields input&gt;
+}
+</code></pre>
+<h4><a class="anchor" aria-hidden="true" id="sketch-summary"></a><a href="#sketch-summary" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Sketch Summary</h4>
+<p>This returns a summary of the sketch that can be used for debugging. This is the result of calling toString() method.</p>
+<pre><code class="hljs css language-json">{
+  <span class="hljs-attr">"type"</span>  : <span class="hljs-string">"thetaSketchToString"</span>,
+  <span class="hljs-attr">"name"</span>: &lt;output name&gt;,
+  <span class="hljs-attr">"field"</span>  : &lt;post aggregator that refers to a Theta sketch (fieldAccess or another post aggregator)&gt;
+}
+</code></pre>
+<h3><a class="anchor" aria-hidden="true" id="examples"></a><a href="#examples" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Examples</h3>
+<p>Assuming, you have a dataset containing (timestamp, product, user_id). You want to answer questions like</p>
+<p>How many unique users visited product A?
+How many unique users visited both product A and product B?</p>
+<p>to answer above questions, you would index your data using following aggregator.</p>
+<pre><code class="hljs css language-json">{ <span class="hljs-attr">"type"</span>: <span class="hljs-string">"thetaSketch"</span>, <span class="hljs-attr">"name"</span>: <span class="hljs-string">"user_id_sketch"</span>, <span class="hljs-attr">"fieldName"</span>: <span class="hljs-string">"user_id"</span> }
+</code></pre>
+<p>then, sample query for, How many unique users visited product A?</p>
+<pre><code class="hljs css language-json">{
+  <span class="hljs-attr">"queryType"</span>: <span class="hljs-string">"groupBy"</span>,
+  <span class="hljs-attr">"dataSource"</span>: <span class="hljs-string">"test_datasource"</span>,
+  <span class="hljs-attr">"granularity"</span>: <span class="hljs-string">"ALL"</span>,
+  <span class="hljs-attr">"dimensions"</span>: [],
+  <span class="hljs-attr">"aggregations"</span>: [
+    { <span class="hljs-attr">"type"</span>: <span class="hljs-string">"thetaSketch"</span>, <span class="hljs-attr">"name"</span>: <span class="hljs-string">"unique_users"</span>, <span class="hljs-attr">"fieldName"</span>: <span class="hljs-string">"user_id_sketch"</span> }
+  ],
+  <span class="hljs-attr">"filter"</span>: { <span class="hljs-attr">"type"</span>: <span class="hljs-string">"selector"</span>, <span class="hljs-attr">"dimension"</span>: <span class="hljs-string">"product"</span>, <span class="hljs-attr">"value"</span>: <span class="hljs-string">"A"</span> },
+  <span class="hljs-attr">"intervals"</span>: [ <span class="hljs-string">"2014-10-19T00:00:00.000Z/2014-10-22T00:00:00.000Z"</span> ]
+}
+</code></pre>
+<p>sample query for, How many unique users visited both product A and B?</p>
+<pre><code class="hljs css language-json">{
+  <span class="hljs-attr">"queryType"</span>: <span class="hljs-string">"groupBy"</span>,
+  <span class="hljs-attr">"dataSource"</span>: <span class="hljs-string">"test_datasource"</span>,
+  <span class="hljs-attr">"granularity"</span>: <span class="hljs-string">"ALL"</span>,
+  <span class="hljs-attr">"dimensions"</span>: [],
+  <span class="hljs-attr">"filter"</span>: {
+    <span class="hljs-attr">"type"</span>: <span class="hljs-string">"or"</span>,
+    <span class="hljs-attr">"fields"</span>: [
+      {<span class="hljs-attr">"type"</span>: <span class="hljs-string">"selector"</span>, <span class="hljs-attr">"dimension"</span>: <span class="hljs-string">"product"</span>, <span class="hljs-attr">"value"</span>: <span class="hljs-string">"A"</span>},
+      {<span class="hljs-attr">"type"</span>: <span class="hljs-string">"selector"</span>, <span class="hljs-attr">"dimension"</span>: <span class="hljs-string">"product"</span>, <span class="hljs-attr">"value"</span>: <span class="hljs-string">"B"</span>}
+    ]
+  },
+  <span class="hljs-attr">"aggregations"</span>: [
+    {
+      <span class="hljs-attr">"type"</span> : <span class="hljs-string">"filtered"</span>,
+      <span class="hljs-attr">"filter"</span> : {
+        <span class="hljs-attr">"type"</span> : <span class="hljs-string">"selector"</span>,
+        <span class="hljs-attr">"dimension"</span> : <span class="hljs-string">"product"</span>,
+        <span class="hljs-attr">"value"</span> : <span class="hljs-string">"A"</span>
+      },
+      <span class="hljs-attr">"aggregator"</span> :     {
+        <span class="hljs-attr">"type"</span>: <span class="hljs-string">"thetaSketch"</span>, <span class="hljs-attr">"name"</span>: <span class="hljs-string">"A_unique_users"</span>, <span class="hljs-attr">"fieldName"</span>: <span class="hljs-string">"user_id_sketch"</span>
+      }
+    },
+    {
+      <span class="hljs-attr">"type"</span> : <span class="hljs-string">"filtered"</span>,
+      <span class="hljs-attr">"filter"</span> : {
+        <span class="hljs-attr">"type"</span> : <span class="hljs-string">"selector"</span>,
+        <span class="hljs-attr">"dimension"</span> : <span class="hljs-string">"product"</span>,
+        <span class="hljs-attr">"value"</span> : <span class="hljs-string">"B"</span>
+      },
+      <span class="hljs-attr">"aggregator"</span> :     {
+        <span class="hljs-attr">"type"</span>: <span class="hljs-string">"thetaSketch"</span>, <span class="hljs-attr">"name"</span>: <span class="hljs-string">"B_unique_users"</span>, <span class="hljs-attr">"fieldName"</span>: <span class="hljs-string">"user_id_sketch"</span>
+      }
+    }
+  ],
+  <span class="hljs-attr">"postAggregations"</span>: [
+    {
+      <span class="hljs-attr">"type"</span>: <span class="hljs-string">"thetaSketchEstimate"</span>,
+      <span class="hljs-attr">"name"</span>: <span class="hljs-string">"final_unique_users"</span>,
+      <span class="hljs-attr">"field"</span>:
+      {
+        <span class="hljs-attr">"type"</span>: <span class="hljs-string">"thetaSketchSetOp"</span>,
+        <span class="hljs-attr">"name"</span>: <span class="hljs-string">"final_unique_users_sketch"</span>,
+        <span class="hljs-attr">"func"</span>: <span class="hljs-string">"INTERSECT"</span>,
+        <span class="hljs-attr">"fields"</span>: [
+          {
+            <span class="hljs-attr">"type"</span>: <span class="hljs-string">"fieldAccess"</span>,
+            <span class="hljs-attr">"fieldName"</span>: <span class="hljs-string">"A_unique_users"</span>
+          },
+          {
+            <span class="hljs-attr">"type"</span>: <span class="hljs-string">"fieldAccess"</span>,
+            <span class="hljs-attr">"fieldName"</span>: <span class="hljs-string">"B_unique_users"</span>
+          }
+        ]
+      }
+    }
+  ],
+  <span class="hljs-attr">"intervals"</span>: [
+    <span class="hljs-string">"2014-10-19T00:00:00.000Z/2014-10-22T00:00:00.000Z"</span>
+  ]
+}
+</code></pre>
+<h4><a class="anchor" aria-hidden="true" id="retention-analysis-example"></a><a href="#retention-analysis-example" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Retention Analysis Example</h4>
+<p>Suppose you want to answer a question like, &quot;How many unique users performed a specific action in a particular time period and also performed another specific action in a different time period?&quot;</p>
+<p>e.g., &quot;How many unique users signed up in week 1, and purchased something in week 2?&quot;</p>
+<p>Using the <code>(timestamp, product, user_id)</code> example dataset, data would be indexed with the following aggregator, like in the example above:</p>
+<pre><code class="hljs css language-json">{ <span class="hljs-attr">"type"</span>: <span class="hljs-string">"thetaSketch"</span>, <span class="hljs-attr">"name"</span>: <span class="hljs-string">"user_id_sketch"</span>, <span class="hljs-attr">"fieldName"</span>: <span class="hljs-string">"user_id"</span> }
+</code></pre>
+<p>The following query expresses:</p>
+<p>&quot;Out of the unique users who visited Product A between 10/01/2014 and 10/07/2014, how many visited Product A again in the week of 10/08/2014 to 10/14/2014?&quot;</p>
+<pre><code class="hljs css language-json">{
+  <span class="hljs-attr">"queryType"</span>: <span class="hljs-string">"groupBy"</span>,
+  <span class="hljs-attr">"dataSource"</span>: <span class="hljs-string">"test_datasource"</span>,
+  <span class="hljs-attr">"granularity"</span>: <span class="hljs-string">"ALL"</span>,
+  <span class="hljs-attr">"dimensions"</span>: [],
+  <span class="hljs-attr">"filter"</span>: {
+    <span class="hljs-attr">"type"</span>: <span class="hljs-string">"or"</span>,
+    <span class="hljs-attr">"fields"</span>: [
+      {<span class="hljs-attr">"type"</span>: <span class="hljs-string">"selector"</span>, <span class="hljs-attr">"dimension"</span>: <span class="hljs-string">"product"</span>, <span class="hljs-attr">"value"</span>: <span class="hljs-string">"A"</span>}
+    ]
+  },
+  <span class="hljs-attr">"aggregations"</span>: [
+    {
+      <span class="hljs-attr">"type"</span> : <span class="hljs-string">"filtered"</span>,
+      <span class="hljs-attr">"filter"</span> : {
+        <span class="hljs-attr">"type"</span> : <span class="hljs-string">"and"</span>,
+        <span class="hljs-attr">"fields"</span> : [
+          {
+            <span class="hljs-attr">"type"</span> : <span class="hljs-string">"selector"</span>,
+            <span class="hljs-attr">"dimension"</span> : <span class="hljs-string">"product"</span>,
+            <span class="hljs-attr">"value"</span> : <span class="hljs-string">"A"</span>
+          },
+          {
+            <span class="hljs-attr">"type"</span> : <span class="hljs-string">"interval"</span>,
+            <span class="hljs-attr">"dimension"</span> : <span class="hljs-string">"__time"</span>,
+            <span class="hljs-attr">"intervals"</span> :  [<span class="hljs-string">"2014-10-01T00:00:00.000Z/2014-10-07T00:00:00.000Z"</span>]
+          }
+        ]
+      },
+      <span class="hljs-attr">"aggregator"</span> :     {
+        <span class="hljs-attr">"type"</span>: <span class="hljs-string">"thetaSketch"</span>, <span class="hljs-attr">"name"</span>: <span class="hljs-string">"A_unique_users_week_1"</span>, <span class="hljs-attr">"fieldName"</span>: <span class="hljs-string">"user_id_sketch"</span>
+      }
+    },
+    {
+      <span class="hljs-attr">"type"</span> : <span class="hljs-string">"filtered"</span>,
+      <span class="hljs-attr">"filter"</span> : {
+        <span class="hljs-attr">"type"</span> : <span class="hljs-string">"and"</span>,
+        <span class="hljs-attr">"fields"</span> : [
+          {
+            <span class="hljs-attr">"type"</span> : <span class="hljs-string">"selector"</span>,
+            <span class="hljs-attr">"dimension"</span> : <span class="hljs-string">"product"</span>,
+            <span class="hljs-attr">"value"</span> : <span class="hljs-string">"A"</span>
+          },
+          {
+            <span class="hljs-attr">"type"</span> : <span class="hljs-string">"interval"</span>,
+            <span class="hljs-attr">"dimension"</span> : <span class="hljs-string">"__time"</span>,
+            <span class="hljs-attr">"intervals"</span> :  [<span class="hljs-string">"2014-10-08T00:00:00.000Z/2014-10-14T00:00:00.000Z"</span>]
+          }
+        ]
+      },
+      <span class="hljs-attr">"aggregator"</span> : {
+        <span class="hljs-attr">"type"</span>: <span class="hljs-string">"thetaSketch"</span>, <span class="hljs-attr">"name"</span>: <span class="hljs-string">"A_unique_users_week_2"</span>, <span class="hljs-attr">"fieldName"</span>: <span class="hljs-string">"user_id_sketch"</span>
+      }
+    },
+  ],
+  <span class="hljs-attr">"postAggregations"</span>: [
+    {
+      <span class="hljs-attr">"type"</span>: <span class="hljs-string">"thetaSketchEstimate"</span>,
+      <span class="hljs-attr">"name"</span>: <span class="hljs-string">"final_unique_users"</span>,
+      <span class="hljs-attr">"field"</span>:
+      {
+        <span class="hljs-attr">"type"</span>: <span class="hljs-string">"thetaSketchSetOp"</span>,
+        <span class="hljs-attr">"name"</span>: <span class="hljs-string">"final_unique_users_sketch"</span>,
+        <span class="hljs-attr">"func"</span>: <span class="hljs-string">"INTERSECT"</span>,
+        <span class="hljs-attr">"fields"</span>: [
+          {
+            <span class="hljs-attr">"type"</span>: <span class="hljs-string">"fieldAccess"</span>,
+            <span class="hljs-attr">"fieldName"</span>: <span class="hljs-string">"A_unique_users_week_1"</span>
+          },
+          {
+            <span class="hljs-attr">"type"</span>: <span class="hljs-string">"fieldAccess"</span>,
+            <span class="hljs-attr">"fieldName"</span>: <span class="hljs-string">"A_unique_users_week_2"</span>
+          }
+        ]
+      }
+    }
+  ],
+  <span class="hljs-attr">"intervals"</span>: [<span class="hljs-string">"2014-10-01T00:00:00.000Z/2014-10-14T00:00:00.000Z"</span>]
+}
+</code></pre>
+</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/0.20.0/development/extensions-core/datasketches-quantiles.html"><span class="arrow-prev">← </span><span class="function-name-prevnext">DataSketches Quantiles Sketch module</span></a><a class="docs-next button" href="/docs/0.20.0/development/extensions-core/datasketches-tuple.html"><span class="function-name-prevnext">DataSketches Tuple Sketch module</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"></nav></div><footer class="nav-footer druid-footer" id="footer"><div class="container"><div class="text-center"><p><a href="/technology">Technology</a> · <a href="/use-cases">Use Cases</a> · <a href="/druid-powered">Powered by Druid</a> · <a href="/docs/0.20.0/latest">Docs</a> · <a href="/community/">Community</a> · <a href="/downloads.html">Download</a> · <a href="/faq">FAQ</a></p></div><div class="text-center"><a title="Join the user group" href="https://groups.google.com/forum/#!forum/druid-user" target="_blank"><span class="fa fa-comments"></span></a> · <a title="Follow Druid" href="https://twitter.com/druidio" target="_blank"><span class="fab fa-twitter"></span></a> · <a title="Download via Apache" href="https://www.apache.org/dyn/closer.cgi?path=/incubator/druid/{{ site.druid_versions[0].versions[0].version }}/apache-druid-{{ site.druid_versions[0].versions[0].version }}-bin.tar.gz" target="_blank"><span class="fas fa-feather"></span></a> · <a title="GitHub" href="https://github.com/apache/druid" target="_blank"><span class="fab fa-github"></span></a></div><div class="text-center license">Copyright © 2019 <a href="https://www.apache.org/" target="_blank">Apache Software Foundation</a>.<br/>Except where otherwise noted, licensed under <a rel="license" href="http://creativecommons.org/licenses/by-sa/4.0/">CC BY-SA 4.0</a>.<br/>Apache Druid, Druid, and the Druid logo are either registered trademarks or trademarks of The Apache Software Foundation in the United States and other countries.</div></div></footer></div><script type="text/javascript" src="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.js"></script><script>
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@@ -0,0 +1,210 @@
+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>DataSketches Tuple Sketch module · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/0.20.0/development/extensions-core/datasketches-tuple.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.20.0" /><meta property="og:title" content="DataSketches Tuple Sketch module · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
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+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
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+  -->
+<p>This module provides Apache Druid aggregators based on Tuple sketch from <a href="https://datasketches.apache.org/">Apache DataSketches</a> library. ArrayOfDoublesSketch sketches extend the functionality of the count-distinct Theta sketches by adding arrays of double values associated with unique keys.</p>
+<p>To use this aggregator, make sure you <a href="/docs/0.20.0/development/extensions.html#loading-extensions">include</a> the extension in your config file:</p>
+<pre><code class="hljs"><span class="hljs-attr">druid.extensions.loadList</span>=[<span class="hljs-string">"druid-datasketches"</span>]
+</code></pre>
+<h3><a class="anchor" aria-hidden="true" id="aggregators"></a><a href="#aggregators" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Aggregators</h3>
+<pre><code class="hljs css language-json">{
+  <span class="hljs-attr">"type"</span> : <span class="hljs-string">"arrayOfDoublesSketch"</span>,
+  <span class="hljs-attr">"name"</span> : &lt;output_name&gt;,
+  <span class="hljs-attr">"fieldName"</span> : &lt;metric_name&gt;,
+  <span class="hljs-attr">"nominalEntries"</span>: &lt;number&gt;,
+  <span class="hljs-attr">"numberOfValues"</span> : &lt;number&gt;,
+  <span class="hljs-attr">"metricColumns"</span> : &lt;array of strings&gt;
+ }
+</code></pre>
+<table>
+<thead>
+<tr><th>property</th><th>description</th><th>required?</th></tr>
+</thead>
+<tbody>
+<tr><td>type</td><td>This String should always be &quot;arrayOfDoublesSketch&quot;</td><td>yes</td></tr>
+<tr><td>name</td><td>A String for the output (result) name of the calculation.</td><td>yes</td></tr>
+<tr><td>fieldName</td><td>A String for the name of the input field.</td><td>yes</td></tr>
+<tr><td>nominalEntries</td><td>Parameter that determines the accuracy and size of the sketch. Higher k means higher accuracy but more space to store sketches. Must be a power of 2. See the <a href="https://datasketches.apache.org/docs/Theta/ThetaErrorTable.html">Theta sketch accuracy</a> for details.</td><td>no, defaults to 16384</td></tr>
+<tr><td>numberOfValues</td><td>Number of values associated with each distinct key.</td><td>no, defaults to 1</td></tr>
+<tr><td>metricColumns</td><td>If building sketches from raw data, an array of names of the input columns containing numeric values to be associated with each distinct key.</td><td>no, defaults to empty array</td></tr>
+</tbody>
+</table>
+<h3><a class="anchor" aria-hidden="true" id="post-aggregators"></a><a href="#post-aggregators" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Post Aggregators</h3>
+<h4><a class="anchor" aria-hidden="true" id="estimate-of-the-number-of-distinct-keys"></a><a href="#estimate-of-the-number-of-distinct-keys" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Estimate of the number of distinct keys</h4>
+<p>Returns a distinct count estimate from a given ArrayOfDoublesSketch.</p>
+<pre><code class="hljs css language-json">{
+  <span class="hljs-attr">"type"</span>  : <span class="hljs-string">"arrayOfDoublesSketchToEstimate"</span>,
+  <span class="hljs-attr">"name"</span>: &lt;output name&gt;,
+  <span class="hljs-attr">"field"</span>  : &lt;post aggregator that refers to an ArrayOfDoublesSketch (fieldAccess or another post aggregator)&gt;
+}
+</code></pre>
+<h4><a class="anchor" aria-hidden="true" id="estimate-of-the-number-of-distinct-keys-with-error-bounds"></a><a href="#estimate-of-the-number-of-distinct-keys-with-error-bounds" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Estimate of the number of distinct keys with error bounds</h4>
+<p>Returns a distinct count estimate and error bounds from a given ArrayOfDoublesSketch. The result will be three double values: estimate of the number of distinct keys, lower bound and upper bound. The bounds are provided at the given number of standard deviations (optional, defaults to 1). This must be an integer value of 1, 2 or 3 corresponding to approximately 68.3%, 95.4% and 99.7% confidence intervals.</p>
+<pre><code class="hljs css language-json">{
+  "type"  : "arrayOfDoublesSketchToEstimateAndBounds",
+  "name": &lt;output name&gt;,
+  "field"  : &lt;post aggregator that refers to an  ArrayOfDoublesSketch (fieldAccess or another post aggregator)&gt;,
+  "numStdDevs", &lt;number from 1 to 3&gt;
+}
+</code></pre>
+<h4><a class="anchor" aria-hidden="true" id="number-of-retained-entries"></a><a href="#number-of-retained-entries" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Number of retained entries</h4>
+<p>Returns the number of retained entries from a given ArrayOfDoublesSketch.</p>
+<pre><code class="hljs css language-json">{
+  <span class="hljs-attr">"type"</span>  : <span class="hljs-string">"arrayOfDoublesSketchToNumEntries"</span>,
+  <span class="hljs-attr">"name"</span>: &lt;output name&gt;,
+  <span class="hljs-attr">"field"</span>  : &lt;post aggregator that refers to an ArrayOfDoublesSketch (fieldAccess or another post aggregator)&gt;
+}
+</code></pre>
+<h4><a class="anchor" aria-hidden="true" id="mean-values-for-each-column"></a><a href="#mean-values-for-each-column" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Mean values for each column</h4>
+<p>Returns a list of mean values from a given ArrayOfDoublesSketch. The result will be N double values, where N is the number of double values kept in the sketch per key.</p>
+<pre><code class="hljs css language-json">{
+  <span class="hljs-attr">"type"</span>  : <span class="hljs-string">"arrayOfDoublesSketchToMeans"</span>,
+  <span class="hljs-attr">"name"</span>: &lt;output name&gt;,
+  <span class="hljs-attr">"field"</span>  : &lt;post aggregator that refers to a DoublesSketch (fieldAccess or another post aggregator)&gt;
+}
+</code></pre>
+<h4><a class="anchor" aria-hidden="true" id="variance-values-for-each-column"></a><a href="#variance-values-for-each-column" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Variance values for each column</h4>
+<p>Returns a list of variance values from a given ArrayOfDoublesSketch. The result will be N double values, where N is the number of double values kept in the sketch per key.</p>
+<pre><code class="hljs css language-json">{
+  <span class="hljs-attr">"type"</span>  : <span class="hljs-string">"arrayOfDoublesSketchToVariances"</span>,
+  <span class="hljs-attr">"name"</span>: &lt;output name&gt;,
+  <span class="hljs-attr">"field"</span>  : &lt;post aggregator that refers to a DoublesSketch (fieldAccess or another post aggregator)&gt;
+}
+</code></pre>
+<h4><a class="anchor" aria-hidden="true" id="quantiles-sketch-from-a-column"></a><a href="#quantiles-sketch-from-a-column" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Quantiles sketch from a column</h4>
+<p>Returns a quantiles DoublesSketch constructed from a given column of values from a given ArrayOfDoublesSketch using optional parameter k that determines the accuracy and size of the quantiles sketch. See <a href="datasketches-quantiles.html">Quantiles Sketch Module</a></p>
+<ul>
+<li>The column number is 1-based and is optional (the default is 1).</li>
+<li>The parameter k is optional (the default is defined in the sketch library).</li>
+<li>The result is a quantiles sketch.</li>
+</ul>
+<pre><code class="hljs css language-json">{
+  <span class="hljs-attr">"type"</span>  : <span class="hljs-string">"arrayOfDoublesSketchToQuantilesSketch"</span>,
+  <span class="hljs-attr">"name"</span>: &lt;output name&gt;,
+  <span class="hljs-attr">"field"</span>  : &lt;post aggregator that refers to a DoublesSketch (fieldAccess or another post aggregator)&gt;,
+  <span class="hljs-attr">"column"</span> : &lt;number&gt;,
+  <span class="hljs-attr">"k"</span> : &lt;parameter that determines the accuracy and size of the quantiles sketch&gt;
+}
+</code></pre>
+<h4><a class="anchor" aria-hidden="true" id="set-operations"></a><a href="#set-operations" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Set Operations</h4>
+<p>Returns a result of a specified set operation on the given array of sketches. Supported operations are: union, intersection and set difference (UNION, INTERSECT, NOT).</p>
+<pre><code class="hljs css language-json">{
+  <span class="hljs-attr">"type"</span>  : <span class="hljs-string">"arrayOfDoublesSketchSetOp"</span>,
+  <span class="hljs-attr">"name"</span>: &lt;output name&gt;,
+  <span class="hljs-attr">"operation"</span>: &lt;<span class="hljs-string">"UNION"</span>|<span class="hljs-string">"INTERSECT"</span>|<span class="hljs-string">"NOT"</span>&gt;,
+  <span class="hljs-attr">"fields"</span>  : &lt;array of post aggregators to access sketch aggregators or post aggregators to allow arbitrary combination of set operations&gt;,
+  <span class="hljs-attr">"nominalEntries"</span> : &lt;parameter that determines the accuracy and size of the sketch&gt;,
+  <span class="hljs-attr">"numberOfValues"</span> : &lt;number of values associated with each distinct key&gt;
+}
+</code></pre>
+<h4><a class="anchor" aria-hidden="true" id="students-t-test"></a><a href="#students-t-test" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Student's t-test</h4>
+<p>Performs Student's t-test and returns a list of p-values given two instances of ArrayOfDoublesSketch. The result will be N double values, where N is the number of double values kept in the sketch per key. See <a href="http://commons.apache.org/proper/commons-math/javadocs/api-3.4/org/apache/commons/math3/stat/inference/TTest.html">t-test documentation</a>.</p>
+<pre><code class="hljs css language-json">{
+  <span class="hljs-attr">"type"</span>  : <span class="hljs-string">"arrayOfDoublesSketchTTest"</span>,
+  <span class="hljs-attr">"name"</span>: &lt;output name&gt;,
+  <span class="hljs-attr">"fields"</span>  : &lt;array with two post aggregators to access sketch aggregators or post aggregators referring to an ArrayOfDoublesSketch&gt;,
+}
+</code></pre>
+<h4><a class="anchor" aria-hidden="true" id="sketch-summary"></a><a href="#sketch-summary" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Sketch summary</h4>
+<p>Returns a human-readable summary of a given ArrayOfDoublesSketch. This is a string returned by toString() method of the sketch. This can be useful for debugging.</p>
+<pre><code class="hljs css language-json">{
+  <span class="hljs-attr">"type"</span>  : <span class="hljs-string">"arrayOfDoublesSketchToString"</span>,
+  <span class="hljs-attr">"name"</span>: &lt;output name&gt;,
+  <span class="hljs-attr">"field"</span>  : &lt;post aggregator that refers to an ArrayOfDoublesSketch (fieldAccess or another post aggregator)&gt;
+}
+</code></pre>
+</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/0.20.0/development/extensions-core/datasketches-theta.html"><span class="arrow-prev">← </span><span class="function-name-prevnext">DataSketches Theta Sketch module</span></a><a class="docs-next button" href="/docs/0.20.0/development/extensions-core/druid-basic-security.html"><span>Basic Security</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"></nav></div><footer class="nav-footer druid-footer" id="footer"><div class="container"><div class="text-center"><p><a href="/technology">Technology</a> · <a href="/use-cases">Use Cases</a> · <a href="/druid-powered">Powered by Druid</a> · <a href="/docs/0.20.0/latest">Docs</a> · <a href="/community/">Community</a> · <a href="/downloads.html">Download</a> · <a href="/faq">FAQ</a></p></div><div class="text-center"><a title="Join the user group" href="https://groups.google.com/forum/#!forum/druid-user" target="_blank"><span class="fa fa-comments"></span></a> · <a title="Follow Druid" href="https://twitter.com/druidio" target="_blank"><span class="fab fa-twitter"></span></a> · <a title="Download via Apache" href="https://www.apache.org/dyn/closer.cgi?path=/incubator/druid/{{ site.druid_versions[0].versions[0].version }}/apache-druid-{{ site.druid_versions[0].versions[0].version }}-bin.tar.gz" target="_blank"><span class="fas fa-feather"></span></a> · <a title="GitHub" href="https://github.com/apache/druid" target="_blank"><span class="fab fa-github"></span></a></div><div class="text-center license">Copyright © 2019 <a href="https://www.apache.org/" target="_blank">Apache Software Foundation</a>.<br/>Except where otherwise noted, licensed under <a rel="license" href="http://creativecommons.org/licenses/by-sa/4.0/">CC BY-SA 4.0</a>.<br/>Apache Druid, Druid, and the Druid logo are either registered trademarks or trademarks of The Apache Software Foundation in the United States and other countries.</div></div></footer></div><script type="text/javascript" src="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.js"></script><script>
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UIs</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/operations/deep-storage-migration.html">Deep storage migration</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/operations/export-metadata.html">Export Metadata Tool</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/operations/metadata-migration.html">Metadata Migration</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/operations/segment-optimization.html">Segment Size Optimization</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/operations/use_sbt_to_build_fat_jar.html">Content for build.sbt</a></li></ul></div></ul></div><div class="navGroup"><h3 class="navGroupCategoryTitle collapsible">Development<span class="arrow"><svg width="24" height="24" viewBox="0 0 24 24"><path fill="#565656" d="M7.41 15.41L12 10.83l4.59 4.58L18 14l-6-6-6 6z"></path><path d="M0 0h24v24H0z" fill="none"></path></svg></span></h3><ul class="hide"><li 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+        </script></nav></div><div class="container mainContainer docsContainer"><div class="wrapper"><div class="post"><header class="postHeader"><a class="edit-page-link button" href="https://github.com/apache/druid/edit/master/docs/development/extensions-core/druid-basic-security.md" target="_blank" rel="noreferrer noopener">Edit</a><h1 id="__docusaurus" class="postHeaderTitle">Basic Security</h1></header><article><div><span><!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+  -->
+<p>This Apache Druid extension adds:</p>
+<ul>
+<li>an Authenticator which supports <a href="https://en.wikipedia.org/wiki/Basic_access_authentication">HTTP Basic authentication</a> using the Druid metadata store or LDAP as its credentials store</li>
+<li>an Authorizer which implements basic role-based access control for Druid metadata store or LDAP users and groups</li>
+</ul>
+<p>Make sure to <a href="/docs/0.20.0/development/extensions.html#loading-extensions">include</a> <code>druid-basic-security</code> as an extension.</p>
+<p>Please see <a href="/docs/0.20.0/design/auth.html">Authentication and Authorization</a> for more information on the extension interfaces being implemented.</p>
+<h2><a class="anchor" aria-hidden="true" id="configuration"></a><a href="#configuration" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Configuration</h2>
+<p>The examples in the section will use &quot;MyBasicMetadataAuthenticator&quot;, &quot;MyBasicLDAPAuthenticator&quot;, &quot;MyBasicMetadataAuthorizer&quot;, and &quot;MyBasicLDAPAuthorizer&quot; as names for the Authenticators and Authorizer.</p>
+<p>These properties are not tied to specific Authenticator or Authorizer instances.</p>
+<p>These configuration properties should be added to the common runtime properties file.</p>
+<h3><a class="anchor" aria-hidden="true" id="properties"></a><a href="#properties" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Properties</h3>
+<table>
+<thead>
+<tr><th>Property</th><th>Description</th><th>Default</th><th>required</th></tr>
+</thead>
+<tbody>
+<tr><td><code>druid.auth.basic.common.pollingPeriod</code></td><td>Defines in milliseconds how often processes should poll the Coordinator for the current Druid metadata store authenticator/authorizer state.</td><td>60000</td><td>No</td></tr>
+<tr><td><code>druid.auth.basic.common.maxRandomDelay</code></td><td>Defines in milliseconds the amount of random delay to add to the pollingPeriod, to spread polling requests across time.</td><td>6000</td><td>No</td></tr>
+<tr><td><code>druid.auth.basic.common.maxSyncRetries</code></td><td>Determines how many times a service will retry if the authentication/authorization Druid metadata store state sync with the Coordinator fails.</td><td>10</td><td>No</td></tr>
+<tr><td><code>druid.auth.basic.common.cacheDirectory</code></td><td>If defined, snapshots of the basic Authenticator and Authorizer Druid metadata store caches will be stored on disk in this directory. If this property is defined, when a service is starting, it will attempt to initialize its caches from these on-disk snapshots, if the service is unable to initialize its state by communicating with the Coordinator.</td><td>null</td><td>No</td></tr>
+</tbody>
+</table>
+<h3><a class="anchor" aria-hidden="true" id="creating-an-authenticator-that-uses-the-druid-metadata-store-to-lookup-and-validate-credentials"></a><a href="#creating-an-authenticator-that-uses-the-druid-metadata-store-to-lookup-and-validate-credentials" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Creating an Authenticator that uses the Druid metadata store to lookup and validate credentials</h3>
+<pre><code class="hljs">druid<span class="hljs-selector-class">.auth</span>.authenticatorChain=[<span class="hljs-string">"MyBasicMetadataAuthenticator"</span>]
+
+druid<span class="hljs-selector-class">.auth</span><span class="hljs-selector-class">.authenticator</span><span class="hljs-selector-class">.MyBasicMetadataAuthenticator</span>.type=basic
+druid<span class="hljs-selector-class">.auth</span><span class="hljs-selector-class">.authenticator</span><span class="hljs-selector-class">.MyBasicMetadataAuthenticator</span>.initialAdminPassword=password1
+druid<span class="hljs-selector-class">.auth</span><span class="hljs-selector-class">.authenticator</span><span class="hljs-selector-class">.MyBasicMetadataAuthenticator</span>.initialInternalClientPassword=password2
+druid<span class="hljs-selector-class">.auth</span><span class="hljs-selector-class">.authenticator</span><span class="hljs-selector-class">.MyBasicMetadataAuthenticator</span><span class="hljs-selector-class">.credentialsValidator</span>.type=metadata
+druid<span class="hljs-selector-class">.auth</span><span class="hljs-selector-class">.authenticator</span><span class="hljs-selector-class">.MyBasicMetadataAuthenticator</span>.skipOnFailure=false
+druid<span class="hljs-selector-class">.auth</span><span class="hljs-selector-class">.authenticator</span><span class="hljs-selector-class">.MyBasicMetadataAuthenticator</span>.authorizerName=MyBasicMetadataAuthorizer
+</code></pre>
+<p>To use the Basic authenticator, add an authenticator with type <code>basic</code> to the authenticatorChain.
+The authenticator needs to also define a credentialsValidator with type 'metadata' or 'ldap'.
+If credentialsValidator is not specified, type 'metadata' will be used as default.</p>
+<p>Configuration of the named authenticator is assigned through properties with the form:</p>
+<pre><code class="hljs">druid.auth.authenticator.<span class="hljs-tag">&lt;<span class="hljs-name">authenticatorName</span>&gt;</span>.<span class="hljs-tag">&lt;<span class="hljs-name">authenticatorProperty</span>&gt;</span>
+</code></pre>
+<p>The authenticator configuration examples in the rest of this document will use &quot;MyBasicMetadataAuthenticator&quot; or &quot;MyBasicLDAPAuthenticator&quot; as the name of the authenticators being configured.</p>
+<h4><a class="anchor" aria-hidden="true" id="properties-for-druid-metadata-store-user-authentication"></a><a href="#properties-for-druid-metadata-store-user-authentication" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Properties for Druid metadata store user authentication</h4>
+<table>
+<thead>
+<tr><th>Property</th><th>Description</th><th>Default</th><th>required</th></tr>
+</thead>
+<tbody>
+<tr><td><code>druid.auth.authenticator.MyBasicMetadataAuthenticator.initialAdminPassword</code></td><td>Initial <a href="/docs/0.20.0/operations/password-provider.html">Password Provider</a> for the automatically created default admin user. If no password is specified, the default admin user will not be created. If the default admin user already exists, setting this property will not affect its password.</td><td>null</td><td>No</td></tr>
+<tr><td><code>druid.auth.authenticator.MyBasicMetadataAuthenticator.initialInternalClientPassword</code></td><td>Initial <a href="/docs/0.20.0/operations/password-provider.html">Password Provider</a> for the default internal system user, used for internal process communication. If no password is specified, the default internal system user will not be created. If the default internal system user already exists, setting this property will not affect its password.</td><td>null</td><td>No</td></tr>
+<tr><td><code>druid.auth.authenticator.MyBasicMetadataAuthenticator.enableCacheNotifications</code></td><td>If true, the Coordinator will notify Druid processes whenever a configuration change to this Authenticator occurs, allowing them to immediately update their state without waiting for polling.</td><td>true</td><td>No</td></tr>
+<tr><td><code>druid.auth.authenticator.MyBasicMetadataAuthenticator.cacheNotificationTimeout</code></td><td>The timeout in milliseconds for the cache notifications.</td><td>5000</td><td>No</td></tr>
+<tr><td><code>druid.auth.authenticator.MyBasicMetadataAuthenticator.credentialIterations</code></td><td>Number of iterations to use for password hashing.</td><td>10000</td><td>No</td></tr>
+<tr><td><code>druid.auth.authenticator.MyBasicMetadataAuthenticator.credentialsValidator.type</code></td><td>The type of credentials store (metadata) to validate requests credentials.</td><td>metadata</td><td>No</td></tr>
+<tr><td><code>druid.auth.authenticator.MyBasicMetadataAuthenticator.skipOnFailure</code></td><td>If true and the request credential doesn't exists or isn't fully configured in the credentials store, the request will proceed to next Authenticator in the chain.</td><td>false</td><td>No</td></tr>
+<tr><td><code>druid.auth.authenticator.MyBasicMetadataAuthenticator.authorizerName</code></td><td>Authorizer that requests should be directed to</td><td>N/A</td><td>Yes</td></tr>
+</tbody>
+</table>
+<h4><a class="anchor" aria-hidden="true" id="properties-for-ldap-user-authentication"></a><a href="#properties-for-ldap-user-authentication" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Properties for LDAP user authentication</h4>
+<table>
+<thead>
+<tr><th>Property</th><th>Description</th><th>Default</th><th>required</th></tr>
+</thead>
+<tbody>
+<tr><td><code>druid.auth.authenticator.MyBasicLDAPAuthenticator.initialAdminPassword</code></td><td>Initial <a href="/docs/0.20.0/operations/password-provider.html">Password Provider</a> for the automatically created default admin user. If no password is specified, the default admin user will not be created. If the default admin user already exists, setting this property will not affect its password.</td><td>null</td><td>No</td></tr>
+<tr><td><code>druid.auth.authenticator.MyBasicLDAPAuthenticator.initialInternalClientPassword</code></td><td>Initial <a href="/docs/0.20.0/operations/password-provider.html">Password Provider</a> for the default internal system user, used for internal process communication. If no password is specified, the default internal system user will not be created. If the default internal system user already exists, setting this property will not affect its password.</td><td>null</td><td>No</td></tr>
+<tr><td><code>druid.auth.authenticator.MyBasicLDAPAuthenticator.enableCacheNotifications</code></td><td>If true, the Coordinator will notify Druid processes whenever a configuration change to this Authenticator occurs, allowing them to immediately update their state without waiting for polling.</td><td>true</td><td>No</td></tr>
+<tr><td><code>druid.auth.authenticator.MyBasicLDAPAuthenticator.cacheNotificationTimeout</code></td><td>The timeout in milliseconds for the cache notifications.</td><td>5000</td><td>No</td></tr>
+<tr><td><code>druid.auth.authenticator.MyBasicLDAPAuthenticator.credentialIterations</code></td><td>Number of iterations to use for password hashing.</td><td>10000</td><td>No</td></tr>
+<tr><td><code>druid.auth.authenticator.MyBasicLDAPAuthenticator.credentialsValidator.type</code></td><td>The type of credentials store (ldap) to validate requests credentials.</td><td>metadata</td><td>No</td></tr>
+<tr><td><code>druid.auth.authenticator.MyBasicLDAPAuthenticator.credentialsValidator.url</code></td><td>URL of the LDAP server.</td><td>null</td><td>Yes</td></tr>
+<tr><td><code>druid.auth.authenticator.MyBasicLDAPAuthenticator.credentialsValidator.bindUser</code></td><td>LDAP bind user username.</td><td>null</td><td>Yes</td></tr>
+<tr><td><code>druid.auth.authenticator.MyBasicLDAPAuthenticator.credentialsValidator.bindPassword</code></td><td><a href="/docs/0.20.0/operations/password-provider.html">Password Provider</a> LDAP bind user password.</td><td>null</td><td>Yes</td></tr>
+<tr><td><code>druid.auth.authenticator.MyBasicLDAPAuthenticator.credentialsValidator.baseDn</code></td><td>The point from where the LDAP server will search for users.</td><td>null</td><td>Yes</td></tr>
+<tr><td><code>druid.auth.authenticator.MyBasicLDAPAuthenticator.credentialsValidator.userSearch</code></td><td>The filter/expression to use for the search. For example, (&amp;(sAMAccountName=%s)(objectClass=user))</td><td>null</td><td>Yes</td></tr>
+<tr><td><code>druid.auth.authenticator.MyBasicLDAPAuthenticator.credentialsValidator.userAttribute</code></td><td>The attribute id identifying the attribute that will be returned as part of the search. For example, sAMAccountName.</td><td>null</td><td>Yes</td></tr>
+<tr><td><code>druid.auth.authenticator.MyBasicLDAPAuthenticator.credentialsValidator.credentialVerifyDuration</code></td><td>The duration in seconds for how long valid credentials are verifiable within the cache when not requested.</td><td>600</td><td>No</td></tr>
+<tr><td><code>druid.auth.authenticator.MyBasicLDAPAuthenticator.credentialsValidator.credentialMaxDuration</code></td><td>The max duration in seconds for valid credentials that can reside in cache regardless of how often they are requested.</td><td>3600</td><td>No</td></tr>
+<tr><td><code>druid.auth.authenticator.MyBasicLDAPAuthenticator.credentialsValidator.credentialCacheSize</code></td><td>The valid credentials cache size. The cache uses a LRU policy.</td><td>100</td><td>No</td></tr>
+<tr><td><code>druid.auth.authenticator.MyBasicLDAPAuthenticator.skipOnFailure</code></td><td>If true and the request credential doesn't exists or isn't fully configured in the credentials store, the request will proceed to next Authenticator in the chain.</td><td>false</td><td>No</td></tr>
+<tr><td><code>druid.auth.authenticator.MyBasicLDAPAuthenticator.authorizerName</code></td><td>Authorizer that requests should be directed to.</td><td>N/A</td><td>Yes</td></tr>
+</tbody>
+</table>
+<h3><a class="anchor" aria-hidden="true" id="creating-an-escalator"></a><a href="#creating-an-escalator" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Creating an Escalator</h3>
+<pre><code class="hljs"><span class="hljs-comment"># Escalator</span>
+<span class="hljs-attr">druid.escalator.type</span>=basic
+<span class="hljs-attr">druid.escalator.internalClientUsername</span>=druid_system
+<span class="hljs-attr">druid.escalator.internalClientPassword</span>=password2
+<span class="hljs-attr">druid.escalator.authorizerName</span>=MyBasicMetadataAuthorizer
+</code></pre>
+<h4><a class="anchor" aria-hidden="true" id="properties-1"></a><a href="#properties-1" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Properties</h4>
+<table>
+<thead>
+<tr><th>Property</th><th>Description</th><th>Default</th><th>required</th></tr>
+</thead>
+<tbody>
+<tr><td><code>druid.escalator.internalClientUsername</code></td><td>The escalator will use this username for requests made as the internal system user.</td><td>n/a</td><td>Yes</td></tr>
+<tr><td><code>druid.escalator.internalClientPassword</code></td><td>The escalator will use this <a href="/docs/0.20.0/operations/password-provider.html">Password Provider</a> for requests made as the internal system user.</td><td>n/a</td><td>Yes</td></tr>
+<tr><td><code>druid.escalator.authorizerName</code></td><td>Authorizer that requests should be directed to.</td><td>n/a</td><td>Yes</td></tr>
+</tbody>
+</table>
+<h3><a class="anchor" aria-hidden="true" id="creating-an-authorizer"></a><a href="#creating-an-authorizer" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Creating an Authorizer</h3>
+<pre><code class="hljs"><span class="hljs-attr">druid.auth.authorizers</span>=[<span class="hljs-string">"MyBasicMetadataAuthorizer"</span>]
+
+<span class="hljs-attr">druid.auth.authorizer.MyBasicMetadataAuthorizer.type</span>=basic
+</code></pre>
+<p>To use the Basic authorizer, add an authorizer with type <code>basic</code> to the authorizers list.</p>
+<p>Configuration of the named authorizer is assigned through properties with the form:</p>
+<pre><code class="hljs">druid.auth.authorizer.<span class="hljs-tag">&lt;<span class="hljs-name">authorizerName</span>&gt;</span>.<span class="hljs-tag">&lt;<span class="hljs-name">authorizerProperty</span>&gt;</span>
+</code></pre>
+<p>The authorizer configuration examples in the rest of this document will use &quot;MyBasicMetadataAuthorizer&quot; or &quot;MyBasicLDAPAuthorizer&quot; as the name of the authenticators being configured.</p>
+<h4><a class="anchor" aria-hidden="true" id="properties-for-druid-metadata-store-user-authorization"></a><a href="#properties-for-druid-metadata-store-user-authorization" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Properties for Druid metadata store user authorization</h4>
+<table>
+<thead>
+<tr><th>Property</th><th>Description</th><th>Default</th><th>required</th></tr>
+</thead>
+<tbody>
+<tr><td><code>druid.auth.authorizer.MyBasicMetadataAuthorizer.enableCacheNotifications</code></td><td>If true, the Coordinator will notify Druid processes whenever a configuration change to this Authorizer occurs, allowing them to immediately update their state without waiting for polling.</td><td>true</td><td>No</td></tr>
+<tr><td><code>druid.auth.authorizer.MyBasicMetadataAuthorizer.cacheNotificationTimeout</code></td><td>The timeout in milliseconds for the cache notifications.</td><td>5000</td><td>No</td></tr>
+<tr><td><code>druid.auth.authorizer.MyBasicMetadataAuthorizer.initialAdminUser</code></td><td>The initial admin user with role defined in initialAdminRole property if specified, otherwise the default admin role will be assigned.</td><td>admin</td><td>No</td></tr>
+<tr><td><code>druid.auth.authorizer.MyBasicMetadataAuthorizer.initialAdminRole</code></td><td>The initial admin role to create if it doesn't already exists.</td><td>admin</td><td>No</td></tr>
+<tr><td><code>druid.auth.authorizer.MyBasicMetadataAuthorizer.roleProvider.type</code></td><td>The type of role provider to authorize requests credentials.</td><td>metadata</td><td>No</td></tr>
+</tbody>
+</table>
+<h4><a class="anchor" aria-hidden="true" id="properties-for-ldap-user-authorization"></a><a href="#properties-for-ldap-user-authorization" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Properties for LDAP user authorization</h4>
+<table>
+<thead>
+<tr><th>Property</th><th>Description</th><th>Default</th><th>required</th></tr>
+</thead>
+<tbody>
+<tr><td><code>druid.auth.authorizer.MyBasicLDAPAuthorizer.enableCacheNotifications</code></td><td>If true, the Coordinator will notify Druid processes whenever a configuration change to this Authorizer occurs, allowing them to immediately update their state without waiting for polling.</td><td>true</td><td>No</td></tr>
+<tr><td><code>druid.auth.authorizer.MyBasicLDAPAuthorizer.cacheNotificationTimeout</code></td><td>The timeout in milliseconds for the cache notifications.</td><td>5000</td><td>No</td></tr>
+<tr><td><code>druid.auth.authorizer.MyBasicLDAPAuthorizer.initialAdminUser</code></td><td>The initial admin user with role defined in initialAdminRole property if specified, otherwise the default admin role will be assigned.</td><td>admin</td><td>No</td></tr>
+<tr><td><code>druid.auth.authorizer.MyBasicLDAPAuthorizer.initialAdminRole</code></td><td>The initial admin role to create if it doesn't already exists.</td><td>admin</td><td>No</td></tr>
+<tr><td><code>druid.auth.authorizer.MyBasicLDAPAuthorizer.initialAdminGroupMapping</code></td><td>The initial admin group mapping with role defined in initialAdminRole property if specified, otherwise the default admin role will be assigned. The name of this initial admin group mapping will be set to adminGroupMapping</td><td>null</td><td>No</td></tr>
+<tr><td><code>druid.auth.authorizer.MyBasicLDAPAuthorizer.roleProvider.type</code></td><td>The type of role provider (ldap) to authorize requests credentials.</td><td>metadata</td><td>No</td></tr>
+<tr><td><code>druid.auth.authorizer.MyBasicLDAPAuthorizer.roleProvider.groupFilters</code></td><td>Array of LDAP group filters used to filter out the allowed set of groups returned from LDAP search. Filters can be begin with <em>, or end with ,</em> to provide configurational flexibility to limit or filter allowed set of groups available to LDAP Authorizer.</td><td>null</td><td>No</td></tr>
+</tbody>
+</table>
+<h2><a class="anchor" aria-hidden="true" id="usage"></a><a href="#usage" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Usage</h2>
+<h3><a class="anchor" aria-hidden="true" id="coordinator-security-api"></a><a href="#coordinator-security-api" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Coordinator Security API</h3>
+<p>To use these APIs, a user needs read/write permissions for the CONFIG resource type with name &quot;security&quot;.</p>
+<h4><a class="anchor" aria-hidden="true" id="authentication-api"></a><a href="#authentication-api" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Authentication API</h4>
+<p>Root path: <code>/druid-ext/basic-security/authentication</code></p>
+<p>Each API endpoint includes {authenticatorName}, specifying which Authenticator instance is being configured.</p>
+<h5><a class="anchor" aria-hidden="true" id="usercredential-management"></a><a href="#usercredential-management" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>User/Credential Management</h5>
+<p><code>GET(/druid-ext/basic-security/authentication/db/{authenticatorName}/users)</code>
+Return a list of all user names.</p>
+<p><code>GET(/druid-ext/basic-security/authentication/db/{authenticatorName}/users/{userName})</code>
+Return the name and credentials information of the user with name {userName}</p>
+<p><code>POST(/druid-ext/basic-security/authentication/db/{authenticatorName}/users/{userName})</code>
+Create a new user with name {userName}</p>
+<p><code>DELETE(/druid-ext/basic-security/authentication/db/{authenticatorName}/users/{userName})</code>
+Delete the user with name {userName}</p>
+<p><code>POST(/druid-ext/basic-security/authentication/db/{authenticatorName}/users/{userName}/credentials)</code>
+Assign a password used for HTTP basic authentication for {userName}
+Content: JSON password request object</p>
+<p>Example request body:</p>
+<pre><code class="hljs">{
+  <span class="hljs-attr">"password"</span>: <span class="hljs-string">"helloworld"</span>
+}
+</code></pre>
+<h5><a class="anchor" aria-hidden="true" id="cache-load-status"></a><a href="#cache-load-status" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Cache Load Status</h5>
+<p><code>GET(/druid-ext/basic-security/authentication/loadStatus)</code>
+Return the current load status of the local caches of the authentication Druid metadata store.</p>
+<h4><a class="anchor" aria-hidden="true" id="authorization-api"></a><a href="#authorization-api" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Authorization API</h4>
+<p>Root path: <code>/druid-ext/basic-security/authorization</code></p>
+<p>Each API endpoint includes {authorizerName}, specifying which Authorizer instance is being configured.</p>
+<h5><a class="anchor" aria-hidden="true" id="user-creationdeletion"></a><a href="#user-creationdeletion" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>User Creation/Deletion</h5>
+<p><code>GET(/druid-ext/basic-security/authorization/db/{authorizerName}/users)</code>
+Return a list of all user names.</p>
+<p><code>GET(/druid-ext/basic-security/authorization/db/{authorizerName}/users/{userName})</code>
+Return the name and role information of the user with name {userName}</p>
+<p>Example output:</p>
+<pre><code class="hljs css language-json">{
+  <span class="hljs-attr">"name"</span>: <span class="hljs-string">"druid2"</span>,
+  <span class="hljs-attr">"roles"</span>: [
+    <span class="hljs-string">"druidRole"</span>
+  ]
+}
+</code></pre>
+<p>This API supports the following flags:</p>
+<ul>
+<li><code>?full</code>: The response will also include the full information for each role currently assigned to the user.</li>
+</ul>
+<p>Example output:</p>
+<pre><code class="hljs css language-json">{
+  <span class="hljs-attr">"name"</span>: <span class="hljs-string">"druid2"</span>,
+  <span class="hljs-attr">"roles"</span>: [
+    {
+      <span class="hljs-attr">"name"</span>: <span class="hljs-string">"druidRole"</span>,
+      <span class="hljs-attr">"permissions"</span>: [
+        {
+          <span class="hljs-attr">"resourceAction"</span>: {
+            <span class="hljs-attr">"resource"</span>: {
+              <span class="hljs-attr">"name"</span>: <span class="hljs-string">"A"</span>,
+              <span class="hljs-attr">"type"</span>: <span class="hljs-string">"DATASOURCE"</span>
+            },
+            <span class="hljs-attr">"action"</span>: <span class="hljs-string">"READ"</span>
+          },
+          <span class="hljs-attr">"resourceNamePattern"</span>: <span class="hljs-string">"A"</span>
+        },
+        {
+          <span class="hljs-attr">"resourceAction"</span>: {
+            <span class="hljs-attr">"resource"</span>: {
+              <span class="hljs-attr">"name"</span>: <span class="hljs-string">"C"</span>,
+              <span class="hljs-attr">"type"</span>: <span class="hljs-string">"CONFIG"</span>
+            },
+            <span class="hljs-attr">"action"</span>: <span class="hljs-string">"WRITE"</span>
+          },
+          <span class="hljs-attr">"resourceNamePattern"</span>: <span class="hljs-string">"C"</span>
+        }
+      ]
+    }
+  ]
+}
+</code></pre>
+<p>The output format of this API when <code>?full</code> is specified is deprecated and in later versions will be switched to the output format used when both <code>?full</code> and <code>?simplifyPermissions</code> flag is set.</p>
+<p>The <code>resourceNamePattern</code> is a compiled version of the resource name regex. It is redundant and complicates the use of this API for clients such as frontends that edit the authorization configuration, as the permission format in this output does not match the format used for adding permissions to a role.</p>
+<ul>
+<li><code>?full?simplifyPermissions</code>: When both <code>?full</code> and <code>?simplifyPermissions</code> are set, the permissions in the output will contain only a list of <code>resourceAction</code> objects, without the extraneous <code>resourceNamePattern</code> field.</li>
+</ul>
+<pre><code class="hljs css language-json">{
+  <span class="hljs-attr">"name"</span>: <span class="hljs-string">"druid2"</span>,
+  <span class="hljs-attr">"roles"</span>: [
+    {
+      <span class="hljs-attr">"name"</span>: <span class="hljs-string">"druidRole"</span>,
+      <span class="hljs-attr">"users"</span>: <span class="hljs-literal">null</span>,
+      <span class="hljs-attr">"permissions"</span>: [
+        {
+          <span class="hljs-attr">"resource"</span>: {
+            <span class="hljs-attr">"name"</span>: <span class="hljs-string">"A"</span>,
+            <span class="hljs-attr">"type"</span>: <span class="hljs-string">"DATASOURCE"</span>
+          },
+          <span class="hljs-attr">"action"</span>: <span class="hljs-string">"READ"</span>
+        },
+        {
+          <span class="hljs-attr">"resource"</span>: {
+            <span class="hljs-attr">"name"</span>: <span class="hljs-string">"C"</span>,
+            <span class="hljs-attr">"type"</span>: <span class="hljs-string">"CONFIG"</span>
+          },
+          <span class="hljs-attr">"action"</span>: <span class="hljs-string">"WRITE"</span>
+        }
+      ]
+    }
+  ]
+}
+</code></pre>
+<p><code>POST(/druid-ext/basic-security/authorization/db/{authorizerName}/users/{userName})</code>
+Create a new user with name {userName}</p>
+<p><code>DELETE(/druid-ext/basic-security/authorization/db/{authorizerName}/users/{userName})</code>
+Delete the user with name {userName}</p>
+<h5><a class="anchor" aria-hidden="true" id="group-mapping-creationdeletion"></a><a href="#group-mapping-creationdeletion" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Group mapping Creation/Deletion</h5>
+<p><code>GET(/druid-ext/basic-security/authorization/db/{authorizerName}/groupMappings)</code>
+Return a list of all group mappings.</p>
+<p><code>GET(/druid-ext/basic-security/authorization/db/{authorizerName}/groupMappings/{groupMappingName})</code>
+Return the group mapping and role information of the group mapping with name {groupMappingName}</p>
+<p><code>POST(/druid-ext/basic-security/authorization/db/{authorizerName}/groupMappings/{groupMappingName})</code>
+Create a new group mapping with name {groupMappingName}
+Content: JSON group mapping object
+Example request body:</p>
+<pre><code class="hljs">{
+    <span class="hljs-attr">"name"</span>: <span class="hljs-string">"user"</span>,
+    <span class="hljs-attr">"groupPattern"</span>: <span class="hljs-string">"CN=aaa,OU=aaa,OU=Groupings,DC=corp,DC=company,DC=com"</span>,
+    <span class="hljs-attr">"roles"</span>: [
+        <span class="hljs-string">"user"</span>
+    ]
+}
+</code></pre>
+<p><code>DELETE(/druid-ext/basic-security/authorization/db/{authorizerName}/groupMappings/{groupMappingName})</code>
+Delete the group mapping with name {groupMappingName}</p>
+<h4><a class="anchor" aria-hidden="true" id="role-creationdeletion"></a><a href="#role-creationdeletion" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Role Creation/Deletion</h4>
+<p><code>GET(/druid-ext/basic-security/authorization/db/{authorizerName}/roles)</code>
+Return a list of all role names.</p>
+<p><code>GET(/druid-ext/basic-security/authorization/db/{authorizerName}/roles/{roleName})</code>
+Return name and permissions for the role named {roleName}.</p>
+<p>Example output:</p>
+<pre><code class="hljs css language-json">{
+  <span class="hljs-attr">"name"</span>: <span class="hljs-string">"druidRole2"</span>,
+  <span class="hljs-attr">"permissions"</span>: [
+    {
+      <span class="hljs-attr">"resourceAction"</span>: {
+        <span class="hljs-attr">"resource"</span>: {
+          <span class="hljs-attr">"name"</span>: <span class="hljs-string">"E"</span>,
+          <span class="hljs-attr">"type"</span>: <span class="hljs-string">"DATASOURCE"</span>
+        },
+        <span class="hljs-attr">"action"</span>: <span class="hljs-string">"WRITE"</span>
+      },
+      <span class="hljs-attr">"resourceNamePattern"</span>: <span class="hljs-string">"E"</span>
+    }
+  ]
+}
+</code></pre>
+<p>The default output format of this API is deprecated and in later versions will be switched to the output format used when the <code>?simplifyPermissions</code> flag is set. The <code>resourceNamePattern</code> is a compiled version of the resource name regex. It is redundant and complicates the use of this API for clients such as frontends that edit the authorization configuration, as the permission format in this output does not match the format used for adding permissions to a role.</p>
+<p>This API supports the following flags:</p>
+<ul>
+<li><code>?full</code>: The output will contain an extra <code>users</code> list, containing the users that currently have this role.</li>
+</ul>
+<pre><code class="hljs css language-json">{<span class="hljs-attr">"users"</span>:[<span class="hljs-string">"druid"</span>]}
+</code></pre>
+<ul>
+<li><code>?simplifyPermissions</code>: The permissions in the output will contain only a list of <code>resourceAction</code> objects, without the extraneous <code>resourceNamePattern</code> field. The <code>users</code> field will be null when <code>?full</code> is not specified.</li>
+</ul>
+<p>Example output:</p>
+<pre><code class="hljs css language-json">{
+  <span class="hljs-attr">"name"</span>: <span class="hljs-string">"druidRole2"</span>,
+  <span class="hljs-attr">"users"</span>: <span class="hljs-literal">null</span>,
+  <span class="hljs-attr">"permissions"</span>: [
+    {
+      <span class="hljs-attr">"resource"</span>: {
+        <span class="hljs-attr">"name"</span>: <span class="hljs-string">"E"</span>,
+        <span class="hljs-attr">"type"</span>: <span class="hljs-string">"DATASOURCE"</span>
+      },
+      <span class="hljs-attr">"action"</span>: <span class="hljs-string">"WRITE"</span>
+    }
+  ]
+}
+</code></pre>
+<p><code>POST(/druid-ext/basic-security/authorization/db/{authorizerName}/roles/{roleName})</code>
+Create a new role with name {roleName}.
+Content: username string</p>
+<p><code>DELETE(/druid-ext/basic-security/authorization/db/{authorizerName}/roles/{roleName})</code>
+Delete the role with name {roleName}.</p>
+<h4><a class="anchor" aria-hidden="true" id="role-assignment"></a><a href="#role-assignment" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Role Assignment</h4>
+<p><code>POST(/druid-ext/basic-security/authorization/db/{authorizerName}/users/{userName}/roles/{roleName})</code>
+Assign role {roleName} to user {userName}.</p>
+<p><code>DELETE(/druid-ext/basic-security/authorization/db/{authorizerName}/users/{userName}/roles/{roleName})</code>
+Unassign role {roleName} from user {userName}</p>
+<p><code>POST(/druid-ext/basic-security/authorization/db/{authorizerName}/groupMappings/{groupMappingName}/roles/{roleName})</code>
+Assign role {roleName} to group mapping {groupMappingName}.</p>
+<p><code>DELETE(/druid-ext/basic-security/authorization/db/{authorizerName}/groupMappings/{groupMappingName}/roles/{roleName})</code>
+Unassign role {roleName} from group mapping {groupMappingName}</p>
+<h4><a class="anchor" aria-hidden="true" id="permissions"></a><a href="#permissions" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Permissions</h4>
+<p><code>POST(/druid-ext/basic-security/authorization/db/{authorizerName}/roles/{roleName}/permissions)</code>
+Set the permissions of {roleName}. This replaces the previous set of permissions on the role.</p>
+<p>Content: List of JSON Resource-Action objects, e.g.:</p>
+<pre><code class="hljs">[
+{
+  <span class="hljs-attr">"resource"</span>: {
+    <span class="hljs-attr">"name"</span>: <span class="hljs-string">"wiki.*"</span>,
+    <span class="hljs-attr">"type"</span>: <span class="hljs-string">"DATASOURCE"</span>
+  },
+  <span class="hljs-attr">"action"</span>: <span class="hljs-string">"READ"</span>
+},
+{
+  <span class="hljs-attr">"resource"</span>: {
+    <span class="hljs-attr">"name"</span>: <span class="hljs-string">"wikiticker"</span>,
+    <span class="hljs-attr">"type"</span>: <span class="hljs-string">"DATASOURCE"</span>
+  },
+  <span class="hljs-attr">"action"</span>: <span class="hljs-string">"WRITE"</span>
+}
+]
+</code></pre>
+<p>The &quot;name&quot; field for resources in the permission definitions are regexes used to match resource names during authorization checks.</p>
+<p>Please see <a href="#defining-permissions">Defining permissions</a> for more details.</p>
+<h5><a class="anchor" aria-hidden="true" id="cache-load-status-1"></a><a href="#cache-load-status-1" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Cache Load Status</h5>
+<p><code>GET(/druid-ext/basic-security/authorization/loadStatus)</code>
+Return the current load status of the local caches of the authorization Druid metadata store.</p>
+<h2><a class="anchor" aria-hidden="true" id="default-user-accounts"></a><a href="#default-user-accounts" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Default user accounts</h2>
+<h3><a class="anchor" aria-hidden="true" id="authenticator"></a><a href="#authenticator" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Authenticator</h3>
+<p>If <code>druid.auth.authenticator.&lt;authenticator-name&gt;.initialAdminPassword</code> is set, a default admin user named &quot;admin&quot; will be created, with the specified initial password. If this configuration is omitted, the &quot;admin&quot; user will not be created.</p>
+<p>If <code>druid.auth.authenticator.&lt;authenticator-name&gt;.initialInternalClientPassword</code> is set, a default internal system user named &quot;druid_system&quot; will be created, with the specified initial password. If this configuration is omitted, the &quot;druid_system&quot; user will not be created.</p>
+<h3><a class="anchor" aria-hidden="true" id="authorizer"></a><a href="#authorizer" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Authorizer</h3>
+<p>Each Authorizer will always have a default &quot;admin&quot; and &quot;druid_system&quot; user with full privileges.</p>
+<h2><a class="anchor" aria-hidden="true" id="defining-permissions"></a><a href="#defining-permissions" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Defining permissions</h2>
+<p>There are two action types in Druid: READ and WRITE</p>
+<p>There are three resource types in Druid: DATASOURCE, CONFIG, and STATE.</p>
+<h3><a class="anchor" aria-hidden="true" id="datasource"></a><a href="#datasource" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>DATASOURCE</h3>
+<p>Resource names for this type are datasource names. Specifying a datasource permission allows the administrator to grant users access to specific datasources.</p>
+<h3><a class="anchor" aria-hidden="true" id="config"></a><a href="#config" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>CONFIG</h3>
+<p>There are two possible resource names for the &quot;CONFIG&quot; resource type, &quot;CONFIG&quot; and &quot;security&quot;. Granting a user access to CONFIG resources allows them to access the following endpoints.</p>
+<p>&quot;CONFIG&quot; resource name covers the following endpoints:</p>
+<table>
+<thead>
+<tr><th>Endpoint</th><th>Process Type</th></tr>
+</thead>
+<tbody>
+<tr><td><code>/druid/coordinator/v1/config</code></td><td>coordinator</td></tr>
+<tr><td><code>/druid/indexer/v1/worker</code></td><td>overlord</td></tr>
+<tr><td><code>/druid/indexer/v1/worker/history</code></td><td>overlord</td></tr>
+<tr><td><code>/druid/worker/v1/disable</code></td><td>middleManager</td></tr>
+<tr><td><code>/druid/worker/v1/enable</code></td><td>middleManager</td></tr>
+</tbody>
+</table>
+<p>&quot;security&quot; resource name covers the following endpoint:</p>
+<table>
+<thead>
+<tr><th>Endpoint</th><th>Process Type</th></tr>
+</thead>
+<tbody>
+<tr><td><code>/druid-ext/basic-security/authentication</code></td><td>coordinator</td></tr>
+<tr><td><code>/druid-ext/basic-security/authorization</code></td><td>coordinator</td></tr>
+</tbody>
+</table>
+<h3><a class="anchor" aria-hidden="true" id="state"></a><a href="#state" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>STATE</h3>
+<p>There is only one possible resource name for the &quot;STATE&quot; config resource type, &quot;STATE&quot;. Granting a user access to STATE resources allows them to access the following endpoints.</p>
+<p>&quot;STATE&quot; resource name covers the following endpoints:</p>
+<table>
+<thead>
+<tr><th>Endpoint</th><th>Process Type</th></tr>
+</thead>
+<tbody>
+<tr><td><code>/druid/coordinator/v1</code></td><td>coordinator</td></tr>
+<tr><td><code>/druid/coordinator/v1/rules</code></td><td>coordinator</td></tr>
+<tr><td><code>/druid/coordinator/v1/rules/history</code></td><td>coordinator</td></tr>
+<tr><td><code>/druid/coordinator/v1/servers</code></td><td>coordinator</td></tr>
+<tr><td><code>/druid/coordinator/v1/tiers</code></td><td>coordinator</td></tr>
+<tr><td><code>/druid/broker/v1</code></td><td>broker</td></tr>
+<tr><td><code>/druid/v2/candidates</code></td><td>broker</td></tr>
+<tr><td><code>/druid/indexer/v1/leader</code></td><td>overlord</td></tr>
+<tr><td><code>/druid/indexer/v1/isLeader</code></td><td>overlord</td></tr>
+<tr><td><code>/druid/indexer/v1/action</code></td><td>overlord</td></tr>
+<tr><td><code>/druid/indexer/v1/workers</code></td><td>overlord</td></tr>
+<tr><td><code>/druid/indexer/v1/scaling</code></td><td>overlord</td></tr>
+<tr><td><code>/druid/worker/v1/enabled</code></td><td>middleManager</td></tr>
+<tr><td><code>/druid/worker/v1/tasks</code></td><td>middleManager</td></tr>
+<tr><td><code>/druid/worker/v1/task/{taskid}/shutdown</code></td><td>middleManager</td></tr>
+<tr><td><code>/druid/worker/v1/task/{taskid}/log</code></td><td>middleManager</td></tr>
+<tr><td><code>/druid/historical/v1</code></td><td>historical</td></tr>
+<tr><td><code>/druid-internal/v1/segments/</code></td><td>historical</td></tr>
+<tr><td><code>/druid-internal/v1/segments/</code></td><td>peon</td></tr>
+<tr><td><code>/druid-internal/v1/segments/</code></td><td>realtime</td></tr>
+<tr><td><code>/status</code></td><td>all process types</td></tr>
+</tbody>
+</table>
+<h3><a class="anchor" aria-hidden="true" id="http-methods"></a><a href="#http-methods" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>HTTP methods</h3>
+<p>For information on what HTTP methods are supported on a particular request endpoint, please refer to the <a href="/docs/0.20.0/operations/api-reference.html">API documentation</a>.</p>
+<p>GET requires READ permission, while POST and DELETE require WRITE permission.</p>
+<h3><a class="anchor" aria-hidden="true" id="sql-permissions"></a><a href="#sql-permissions" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>SQL Permissions</h3>
+<p>Queries on Druid datasources require DATASOURCE READ permissions for the specified datasource.</p>
+<p>Queries on the <a href="../../querying/sql.html#information-schema">INFORMATION_SCHEMA tables</a> will
+return information about datasources that the caller has DATASOURCE READ access to. Other
+datasources will be omitted.</p>
+<p>Queries on the <a href="../../querying/sql.html#system-schema">system schema tables</a> require the following permissions:</p>
+<ul>
+<li><code>segments</code>: Segments will be filtered based on DATASOURCE READ permissions.</li>
+<li><code>servers</code>: The user requires STATE READ permissions.</li>
+<li><code>server_segments</code>: The user requires STATE READ permissions and segments will be filtered based on DATASOURCE READ permissions.</li>
+<li><code>tasks</code>: Tasks will be filtered based on DATASOURCE READ permissions.</li>
+</ul>
+<h2><a class="anchor" aria-hidden="true" id="configuration-propagation"></a><a href="#configuration-propagation" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Configuration Propagation</h2>
+<p>To prevent excessive load on the Coordinator, the Authenticator and Authorizer user/role Druid metadata store state is cached on each Druid process.</p>
+<p>Each process will periodically poll the Coordinator for the latest Druid metadata store state, controlled by the <code>druid.auth.basic.common.pollingPeriod</code> and <code>druid.auth.basic.common.maxRandomDelay</code> properties.</p>
+<p>When a configuration update occurs, the Coordinator can optionally notify each process with the updated Druid metadata store state. This behavior is controlled by the <code>enableCacheNotifications</code> and <code>cacheNotificationTimeout</code> properties on Authenticators and Authorizers.</p>
+<p>Note that because of the caching, changes made to the user/role Druid metadata store may not be immediately reflected at each Druid process.</p>
+</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/0.20.0/development/extensions-core/datasketches-tuple.html"><span class="arrow-prev">← </span><span class="function-name-prevnext">DataSketches Tuple Sketch module</span></a><a class="docs-next button" href="/docs/0.20.0/development/extensions-core/druid-kerberos.html"><span>Kerberos</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#configuration">Configuration</a><ul class="toc-headings"><li><a href="#properties">Properties</a></li><li><a href="#creating-an-authenticator-that-uses-the-druid-metadata-store-to-lookup-and-validate-credentials">Creating an Authenticator that uses the Druid metadata store to lookup and validate credentials</a></li><li><a href="#creating-an-escalator">Creating an Escalator</a></li><li><a href="#creating-an-authorizer">Creating an Authorizer</a></li></ul></li><li><a href="#usage">Usage</a><ul class="toc-headings"><li><a href="#coordinator-security-api">Coordinator Security API</a></li></ul></li><li><a href="#default-user-accounts">Default user accounts</a><ul class="toc-headings"><li><a href="#authenticator">Authenticator</a></li><li><a href="#authorizer">Authorizer</a></li></ul></li><li><a href="#defining-permissions">Defining permissions</a><ul class="toc-headings"><li><a href="#datasource">DATASOURCE</a></li><li><a href="#config">CONFIG</a></li><li><a href="#state">STATE</a></li><li><a href="#http-methods">HTTP methods</a></li><li><a href="#sql-permissions">SQL Permissions</a></li></ul></li><li><a href="#configuration-propagation">Configuration Propagation</a></li></ul></nav></div><footer class="nav-footer druid-footer" id="footer"><div class="container"><div class="text-center"><p><a href="/technology">Technology</a> · <a href="/use-cases">Use Cases</a> · <a href="/druid-powered">Powered by Druid</a> · <a href="/docs/0.20.0/latest">Docs</a> · <a href="/community/">Community</a> · <a href="/downloads.html">Download</a> · <a href="/faq">FAQ</a></p></div><div class="text-center"><a title="Join the user group" href="https://groups.google.com/forum/#!forum/druid-user" target="_blank"><span class="fa fa-comments"></span></a> · <a title="Follow Druid" href="https://twitter.com/druidio" target="_blank"><span class="fab fa-twitter"></span></a> · <a title="Download via Apache" href="https://www.apache.org/dyn/closer.cgi?path=/incubator/druid/{{ site.druid_versions[0].versions[0].version }}/apache-druid-{{ site.druid_versions[0].versions[0].version }}-bin.tar.gz" target="_blank"><span class="fas fa-feather"></span></a> · <a title="GitHub" href="https://github.com/apache/druid" target="_blank"><span class="fab fa-github"></span></a></div><div class="text-center license">Copyright © 2019 <a href="https://www.apache.org/" target="_blank">Apache Software Foundation</a>.<br/>Except where otherwise noted, licensed under <a rel="license" href="http://creativecommons.org/licenses/by-sa/4.0/">CC BY-SA 4.0</a>.<br/>Apache Druid, Druid, and the Druid logo are either registered trademarks or trademarks of The Apache Software Foundation in the United States and other countries.</div></div></footer></div><script type="text/javascript" src="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.js"></script><script>
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+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Kerberos · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/0.20.0/development/extensions-core/druid-kerberos.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.20.0" /><meta property="og:title" content="Kerberos · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
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+<p>Apache Druid Extension to enable Authentication for Druid Processes using Kerberos.
+This extension adds an Authenticator which is used to protect HTTP Endpoints using the simple and protected GSSAPI negotiation mechanism <a href="https://en.wikipedia.org/wiki/SPNEGO">SPNEGO</a>.
+Make sure to <a href="/docs/0.20.0/development/extensions.html#loading-extensions">include</a> <code>druid-kerberos</code> as an extension.</p>
+<h2><a class="anchor" aria-hidden="true" id="configuration"></a><a href="#configuration" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Configuration</h2>
+<h3><a class="anchor" aria-hidden="true" id="creating-an-authenticator"></a><a href="#creating-an-authenticator" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Creating an Authenticator</h3>
+<pre><code class="hljs"><span class="hljs-attr">druid.auth.authenticatorChain</span>=[<span class="hljs-string">"MyKerberosAuthenticator"</span>]
+
+<span class="hljs-attr">druid.auth.authenticator.MyKerberosAuthenticator.type</span>=kerberos
+</code></pre>
+<p>To use the Kerberos authenticator, add an authenticator with type <code>kerberos</code> to the authenticatorChain. The example above uses the name &quot;MyKerberosAuthenticator&quot; for the Authenticator.</p>
+<p>Configuration of the named authenticator is assigned through properties with the form:</p>
+<pre><code class="hljs">druid.auth.authenticator.<span class="hljs-tag">&lt;<span class="hljs-name">authenticatorName</span>&gt;</span>.<span class="hljs-tag">&lt;<span class="hljs-name">authenticatorProperty</span>&gt;</span>
+</code></pre>
+<p>The configuration examples in the rest of this document will use &quot;kerberos&quot; as the name of the authenticator being configured.</p>
+<h3><a class="anchor" aria-hidden="true" id="properties"></a><a href="#properties" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Properties</h3>
+<table>
+<thead>
+<tr><th>Property</th><th>Possible Values</th><th>Description</th><th>Default</th><th>required</th></tr>
+</thead>
+<tbody>
+<tr><td><code>druid.auth.authenticator.kerberos.serverPrincipal</code></td><td><code>HTTP/_HOST@EXAMPLE.COM</code></td><td>SPNEGO service principal used by druid processes</td><td>empty</td><td>Yes</td></tr>
+<tr><td><code>druid.auth.authenticator.kerberos.serverKeytab</code></td><td><code>/etc/security/keytabs/spnego.service.keytab</code></td><td>SPNego service keytab used by druid processes</td><td>empty</td><td>Yes</td></tr>
+<tr><td><code>druid.auth.authenticator.kerberos.authToLocal</code></td><td><code>RULE:[1:$1@$0](druid@EXAMPLE.COM)s/.*/druid DEFAULT</code></td><td>It allows you to set a general rule for mapping principal names to local user names. It will be used if there is not an explicit mapping for the principal name that is being translated.</td><td>DEFAULT</td><td>No</td></tr>
+<tr><td><code>druid.auth.authenticator.kerberos.cookieSignatureSecret</code></td><td><code>secretString</code></td><td>Secret used to sign authentication cookies. It is advisable to explicitly set it, if you have multiple druid nodes running on same machine with different ports as the Cookie Specification does not guarantee isolation by port.</td><td><Random value></td><td>No</td></tr>
+<tr><td><code>druid.auth.authenticator.kerberos.authorizerName</code></td><td>Depends on available authorizers</td><td>Authorizer that requests should be directed to</td><td>Empty</td><td>Yes</td></tr>
+</tbody>
+</table>
+<p>As a note, it is required that the SPNego principal in use by the druid processes must start with HTTP (This specified by <a href="https://tools.ietf.org/html/rfc4559">RFC-4559</a>) and must be of the form &quot;HTTP/_HOST@REALM&quot;.
+The special string _HOST will be replaced automatically with the value of config <code>druid.host</code></p>
+<h3><a class="anchor" aria-hidden="true" id="druidauthauthenticatorkerberosexcludedpaths"></a><a href="#druidauthauthenticatorkerberosexcludedpaths" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a><code>druid.auth.authenticator.kerberos.excludedPaths</code></h3>
+<p>In older releases, the Kerberos authenticator had an <code>excludedPaths</code> property that allowed the user to specify a list of paths where authentication checks should be skipped. This property has been removed from the Kerberos authenticator because the path exclusion functionality is now handled across all authenticators/authorizers by setting <code>druid.auth.unsecuredPaths</code>, as described in the <a href="/docs/0.20.0/design/auth.html">main auth documentation</a>.</p>
+<h3><a class="anchor" aria-hidden="true" id="auth-to-local-syntax"></a><a href="#auth-to-local-syntax" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Auth to Local Syntax</h3>
+<p><code>druid.auth.authenticator.kerberos.authToLocal</code> allows you to set a general rules for mapping principal names to local user names.
+The syntax for mapping rules is <code>RULE:\[n:string](regexp)s/pattern/replacement/g</code>. The integer n indicates how many components the target principal should have. If this matches, then a string will be formed from string, substituting the realm of the principal for $0 and the nth component of the principal for $n. e.g. if the principal was druid/admin then <code>\[2:$2$1suffix]</code> would result in the string <code>admindruidsuffix</code>.
+If this string matches regexp, then the s//[g] substitution command will be run over the string. The optional g will cause the substitution to be global over the string, instead of replacing only the first match in the string.
+If required, multiple rules can be be joined by newline character and specified as a String.</p>
+<h3><a class="anchor" aria-hidden="true" id="increasing-http-header-size-for-large-spnego-negotiate-header"></a><a href="#increasing-http-header-size-for-large-spnego-negotiate-header" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Increasing HTTP Header size for large SPNEGO negotiate header</h3>
+<p>In Active Directory environment, SPNEGO token in the Authorization header includes PAC (Privilege Access Certificate) information,
+which includes all security groups for the user. In some cases when the user belongs to many security groups the header to grow beyond what druid can handle by default.
+In such cases, max request header size that druid can handle can be increased by setting <code>druid.server.http.maxRequestHeaderSize</code> (default 8Kb) and <code>druid.router.http.maxRequestBufferSize</code> (default 8Kb).</p>
+<h2><a class="anchor" aria-hidden="true" id="configuring-kerberos-escalated-client"></a><a href="#configuring-kerberos-escalated-client" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Configuring Kerberos Escalated Client</h2>
+<p>Druid internal processes communicate with each other using an escalated http Client. A Kerberos enabled escalated HTTP Client can be configured by following properties -</p>
+<table>
+<thead>
+<tr><th>Property</th><th>Example Values</th><th>Description</th><th>Default</th><th>required</th></tr>
+</thead>
+<tbody>
+<tr><td><code>druid.escalator.type</code></td><td><code>kerberos</code></td><td>Type of Escalator client used for internal process communication.</td><td>n/a</td><td>Yes</td></tr>
+<tr><td><code>druid.escalator.internalClientPrincipal</code></td><td><code>druid@EXAMPLE.COM</code></td><td>Principal user name, used for internal process communication</td><td>n/a</td><td>Yes</td></tr>
+<tr><td><code>druid.escalator.internalClientKeytab</code></td><td><code>/etc/security/keytabs/druid.keytab</code></td><td>Path to keytab file used for internal process communication</td><td>n/a</td><td>Yes</td></tr>
+<tr><td><code>druid.escalator.authorizerName</code></td><td><code>MyBasicAuthorizer</code></td><td>Authorizer that requests should be directed to.</td><td>n/a</td><td>Yes</td></tr>
+</tbody>
+</table>
+<h2><a class="anchor" aria-hidden="true" id="accessing-druid-http-end-points-when-kerberos-security-is-enabled"></a><a href="#accessing-druid-http-end-points-when-kerberos-security-is-enabled" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Accessing Druid HTTP end points when kerberos security is enabled</h2>
+<ol>
+<li><p>To access druid HTTP endpoints via curl user will need to first login using <code>kinit</code> command as follows -</p>
+<pre><code class="hljs">kinit -k -t <span class="hljs-variable">&lt;path_to_keytab_file&gt;</span> user<span class="hljs-meta">@REALM.COM</span>
+</code></pre></li>
+<li><p>Once the login is successful verify that login is successful using <code>klist</code> command</p></li>
+<li><p>Now you can access druid HTTP endpoints using curl command as follows -</p>
+<pre><code class="hljs">curl --negotiate -u:anyUser -<span class="hljs-selector-tag">b</span> ~/cookies<span class="hljs-selector-class">.txt</span> -c ~/cookies<span class="hljs-selector-class">.txt</span> -X POST -H<span class="hljs-string">'Content-Type: application/json'</span> &lt;HTTP_END_POINT&gt;
+</code></pre>
+<p>e.g to send a query from file <code>query.json</code> to the Druid Broker use this command -</p>
+<pre><code class="hljs">curl --negotiate -<span class="hljs-string">u:</span>anyUser -b <span class="hljs-regexp">~/cookies.txt -c ~/</span>cookies.txt -X POST -H<span class="hljs-string">'Content-Type: application/json'</span>  <span class="hljs-string">http:</span><span class="hljs-comment">//broker-host:port/druid/v2/?pretty -d @query.json</span>
+</code></pre>
+<p>Note: Above command will authenticate the user first time using SPNego negotiate mechanism and store the authentication cookie in file. For subsequent requests the cookie will be used for authentication.</p></li>
+</ol>
+<h2><a class="anchor" aria-hidden="true" id="accessing-coordinator-or-overlord-console-from-web-browser"></a><a href="#accessing-coordinator-or-overlord-console-from-web-browser" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Accessing Coordinator or Overlord console from web browser</h2>
+<p>To access Coordinator/Overlord console from browser you will need to configure your browser for SPNego authentication as follows -</p>
+<ol>
+<li>Safari - No configurations required.</li>
+<li>Firefox - Open firefox and follow these steps -
+<ol>
+<li>Go to <code>about:config</code> and search for <code>network.negotiate-auth.trusted-uris</code>.</li>
+<li>Double-click and add the following values: <code>&quot;http://druid-coordinator-hostname:ui-port&quot;</code> and <code>&quot;http://druid-overlord-hostname:port&quot;</code></li>
+</ol></li>
+<li>Google Chrome - From the command line run following commands -
+<ol>
+<li><code>google-chrome --auth-server-whitelist=&quot;druid-coordinator-hostname&quot; --auth-negotiate-delegate-whitelist=&quot;druid-coordinator-hostname&quot;</code></li>
+<li><code>google-chrome --auth-server-whitelist=&quot;druid-overlord-hostname&quot; --auth-negotiate-delegate-whitelist=&quot;druid-overlord-hostname&quot;</code></li>
+</ol></li>
+<li>Internet Explorer -
+<ol>
+<li>Configure trusted websites to include <code>&quot;druid-coordinator-hostname&quot;</code> and <code>&quot;druid-overlord-hostname&quot;</code></li>
+<li>Allow negotiation for the UI website.</li>
+</ol></li>
+</ol>
+<h2><a class="anchor" aria-hidden="true" id="sending-queries-programmatically"></a><a href="#sending-queries-programmatically" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Sending Queries programmatically</h2>
+<p>Many HTTP client libraries, such as Apache Commons <a href="https://hc.apache.org/">HttpComponents</a>, already have support for performing SPNEGO authentication. You can use any of the available HTTP client library to communicate with druid cluster.</p>
+</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/0.20.0/development/extensions-core/druid-basic-security.html"><span class="arrow-prev">← </span><span>Basic Security</span></a><a class="docs-next button" href="/docs/0.20.0/development/extensions-core/druid-lookups.html"><span>Cached Lookup Module</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#configuration">Configuration</a><ul class="toc-headings"><li><a href="#creating-an-authenticator">Creating an Authenticator</a></li><li><a href="#properties">Properties</a></li><li><a href="#druidauthauthenticatorkerberosexcludedpaths"><code>druid.auth.authenticator.kerberos.excludedPaths</code></a></li><li><a href="#auth-to-local-syntax">Auth to Local Syntax</a></li><li><a href="#increasing-http-header-size-for-large-spnego-negotiate-header">Increasing HTTP Header size for large SPNEGO negotiate header</a></li></ul></li><li><a href="#configuring-kerberos-escalated-client">Configuring Kerberos Escalated Client</a></li><li><a href="#accessing-druid-http-end-points-when-kerberos-security-is-enabled">Accessing Druid HTTP end points when kerberos security is enabled</a></li><li><a href="#accessing-coordinator-or-overlord-console-from-web-browser">Accessing Coordinator or Overlord console from web browser</a></li><li><a href="#sending-queries-programmatically">Sending Queries programmatically</a></li></ul></nav></div><footer class="nav-footer druid-footer" id="footer"><div class="container"><div class="text-center"><p><a href="/technology">Technology</a> · <a href="/use-cases">Use Cases</a> · <a href="/druid-powered">Powered by Druid</a> · <a href="/docs/0.20.0/latest">Docs</a> · <a href="/community/">Community</a> · <a href="/downloads.html">Download</a> · <a href="/faq">FAQ</a></p></div><div class="text-center"><a title="Join the user group" href="https://groups.google.com/forum/#!forum/druid-user" target="_blank"><span class="fa fa-comments"></span></a> · <a title="Follow Druid" href="https://twitter.com/druidio" target="_blank"><span class="fab fa-twitter"></span></a> · <a title="Download via Apache" href="https://www.apache.org/dyn/closer.cgi?path=/incubator/druid/{{ site.druid_versions[0].versions[0].version }}/apache-druid-{{ site.druid_versions[0].versions[0].version }}-bin.tar.gz" target="_blank"><span class="fas fa-feather"></span></a> · <a title="GitHub" href="https://github.com/apache/druid" target="_blank"><span class="fab fa-github"></span></a></div><div class="text-center license">Copyright © 2019 <a href="https://www.apache.org/" target="_blank">Apache Software Foundation</a>.<br/>Except where otherwise noted, licensed under <a rel="license" href="http://creativecommons.org/licenses/by-sa/4.0/">CC BY-SA 4.0</a>.<br/>Apache Druid, Druid, and the Druid logo are either registered trademarks or trademarks of The Apache Software Foundation in the United States and other countries.</div></div></footer></div><script type="text/javascript" src="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.js"></script><script>
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+                  target.classList.toggle(className);
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+        </script></nav></div><div class="container mainContainer docsContainer"><div class="wrapper"><div class="post"><header class="postHeader"><a class="edit-page-link button" href="https://github.com/apache/druid/edit/master/docs/development/extensions-core/druid-lookups.md" target="_blank" rel="noreferrer noopener">Edit</a><h1 id="__docusaurus" class="postHeaderTitle">Cached Lookup Module</h1></header><article><div><span><!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
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+  ~ KIND, either express or implied.  See the License for the
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+<blockquote>
+<p>Please note that this is an experimental module and the development/testing still at early stage. Feel free to try it and give us your feedback.</p>
+</blockquote>
+<h2><a class="anchor" aria-hidden="true" id="description"></a><a href="#description" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Description</h2>
+<p>This Apache Druid module provides a per-lookup caching mechanism for JDBC data sources.
+The main goal of this cache is to speed up the access to a high latency lookup sources and to provide a caching isolation for every lookup source.
+Thus user can define various caching strategies or and implementation per lookup, even if the source is the same.
+This module can be used side to side with other lookup module like the global cached lookup module.</p>
+<p>To use this extension please make sure to  <a href="/docs/0.20.0/development/extensions.html#loading-extensions">include</a> <code>druid-lookups-cached-single</code> as an extension.</p>
+<blockquote>
+<p>If using JDBC, you will need to add your database's client JAR files to the extension's directory.
+For Postgres, the connector JAR is already included.
+For MySQL, you can get it from <a href="https://dev.mysql.com/downloads/connector/j/">https://dev.mysql.com/downloads/connector/j/</a>.
+Copy or symlink the downloaded file to <code>extensions/druid-lookups-cached-single</code> under the distribution root directory.</p>
+</blockquote>
+<h2><a class="anchor" aria-hidden="true" id="architecture"></a><a href="#architecture" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Architecture</h2>
+<p>Generally speaking this module can be divided into two main component, namely, the data fetcher layer and caching layer.</p>
+<h3><a class="anchor" aria-hidden="true" id="data-fetcher-layer"></a><a href="#data-fetcher-layer" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Data Fetcher layer</h3>
+<p>First part is the data fetcher layer API <code>DataFetcher</code>, that exposes a set of fetch methods to fetch data from the actual Lookup dimension source.
+For instance <code>JdbcDataFetcher</code> provides an implementation of <code>DataFetcher</code> that can be used to fetch key/value from a RDBMS via JDBC driver.
+If you need new type of data fetcher, all you need to do, is to implement the interface <code>DataFetcher</code> and load it via another druid module.</p>
+<h3><a class="anchor" aria-hidden="true" id="caching-layer"></a><a href="#caching-layer" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Caching layer</h3>
+<p>This extension comes with two different caching strategies. First strategy is a poll based and the second is a load based.</p>
+<h4><a class="anchor" aria-hidden="true" id="poll-lookup-cache"></a><a href="#poll-lookup-cache" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Poll lookup cache</h4>
+<p>The poll strategy cache strategy will fetch and swap all the pair of key/values periodically from the lookup source.
+Hence, user should make sure that the cache can fit all the data.
+The current implementation provides 2 type of poll cache, the first is on-heap (uses immutable map), while the second uses MapDB based off-heap map.
+User can also implement a different lookup polling cache by implementing <code>PollingCacheFactory</code> and <code>PollingCache</code> interfaces.</p>
+<h4><a class="anchor" aria-hidden="true" id="loading-lookup"></a><a href="#loading-lookup" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Loading lookup</h4>
+<p>Loading cache strategy will load the key/value pair upon request on the key it self, the general algorithm is load key if absent.
+Once the key/value  pair is loaded eviction will occur according to the cache eviction policy.
+This module comes with two loading lookup implementation, the first is on-heap backed by a Guava cache implementation, the second is MapDB off-heap implementation.
+Both implementations offer various eviction strategies.
+Same for Loading cache, developer can implement a new type of loading cache by implementing <code>LookupLoadingCache</code> interface.</p>
+<h2><a class="anchor" aria-hidden="true" id="configuration-and-operation"></a><a href="#configuration-and-operation" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Configuration and Operation:</h2>
+<h3><a class="anchor" aria-hidden="true" id="polling-lookup"></a><a href="#polling-lookup" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Polling Lookup</h3>
+<p><strong>Note that the current implementation of <code>offHeapPolling</code> and <code>onHeapPolling</code> will create two caches one to lookup value based on key and the other to reverse lookup the key from value</strong></p>
+<table>
+<thead>
+<tr><th>Field</th><th>Type</th><th>Description</th><th>Required</th><th>default</th></tr>
+</thead>
+<tbody>
+<tr><td>dataFetcher</td><td>JSON object</td><td>Specifies the lookup data fetcher type  to use in order to fetch data</td><td>yes</td><td>null</td></tr>
+<tr><td>cacheFactory</td><td>JSON Object</td><td>Cache factory implementation</td><td>no</td><td>onHeapPolling</td></tr>
+<tr><td>pollPeriod</td><td>Period</td><td>polling period</td><td>no</td><td>null (poll once)</td></tr>
+</tbody>
+</table>
+<h5><a class="anchor" aria-hidden="true" id="example-of-polling-on-heap-lookup"></a><a href="#example-of-polling-on-heap-lookup" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Example of Polling On-heap Lookup</h5>
+<p>This example demonstrates a polling cache that will update its on-heap cache every 10 minutes</p>
+<pre><code class="hljs css language-json">{
+    <span class="hljs-attr">"type"</span>:<span class="hljs-string">"pollingLookup"</span>,
+   <span class="hljs-attr">"pollPeriod"</span>:<span class="hljs-string">"PT10M"</span>,
+   <span class="hljs-attr">"dataFetcher"</span>:{ <span class="hljs-attr">"type"</span>:<span class="hljs-string">"jdbcDataFetcher"</span>, <span class="hljs-attr">"connectorConfig"</span>:<span class="hljs-string">"jdbc://mysql://localhost:3306/my_data_base"</span>, <span class="hljs-attr">"table"</span>:<span class="hljs-string">"lookup_table_name"</span>, <span class="hljs-attr">"keyColumn"</span>:<span class="hljs-string">"key_column_name"</span>, <span class="hljs-attr">"valueColumn"</span>: <span class="hljs-string">"value_column_name"</span>},
+   <span class="hljs-attr">"cacheFactory"</span>:{<span class="hljs-attr">"type"</span>:<span class="hljs-string">"onHeapPolling"</span>}
+}
+
+</code></pre>
+<h5><a class="anchor" aria-hidden="true" id="example-polling-off-heap-lookup"></a><a href="#example-polling-off-heap-lookup" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Example Polling Off-heap Lookup</h5>
+<p>This example demonstrates an off-heap lookup that will be cached once and never swapped <code>(pollPeriod == null)</code></p>
+<pre><code class="hljs css language-json">{
+    <span class="hljs-attr">"type"</span>:<span class="hljs-string">"pollingLookup"</span>,
+   <span class="hljs-attr">"dataFetcher"</span>:{ <span class="hljs-attr">"type"</span>:<span class="hljs-string">"jdbcDataFetcher"</span>, <span class="hljs-attr">"connectorConfig"</span>:<span class="hljs-string">"jdbc://mysql://localhost:3306/my_data_base"</span>, <span class="hljs-attr">"table"</span>:<span class="hljs-string">"lookup_table_name"</span>, <span class="hljs-attr">"keyColumn"</span>:<span class="hljs-string">"key_column_name"</span>, <span class="hljs-attr">"valueColumn"</span>: <span class="hljs-string">"value_column_name"</span>},
+   <span class="hljs-attr">"cacheFactory"</span>:{<span class="hljs-attr">"type"</span>:<span class="hljs-string">"offHeapPolling"</span>}
+}
+
+</code></pre>
+<h3><a class="anchor" aria-hidden="true" id="loading-lookup-1"></a><a href="#loading-lookup-1" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Loading lookup</h3>
+<table>
+<thead>
+<tr><th>Field</th><th>Type</th><th>Description</th><th>Required</th><th>default</th></tr>
+</thead>
+<tbody>
+<tr><td>dataFetcher</td><td>JSON object</td><td>Specifies the lookup data fetcher type  to use in order to fetch data</td><td>yes</td><td>null</td></tr>
+<tr><td>loadingCacheSpec</td><td>JSON Object</td><td>Lookup cache spec implementation</td><td>yes</td><td>null</td></tr>
+<tr><td>reverseLoadingCacheSpec</td><td>JSON Object</td><td>Reverse lookup cache  implementation</td><td>yes</td><td>null</td></tr>
+</tbody>
+</table>
+<h5><a class="anchor" aria-hidden="true" id="example-loading-on-heap-guava"></a><a href="#example-loading-on-heap-guava" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Example Loading On-heap Guava</h5>
+<p>Guava cache configuration spec.</p>
+<table>
+<thead>
+<tr><th>Field</th><th>Type</th><th>Description</th><th>Required</th><th>default</th></tr>
+</thead>
+<tbody>
+<tr><td>concurrencyLevel</td><td>int</td><td>Allowed concurrency among update operations</td><td>no</td><td>4</td></tr>
+<tr><td>initialCapacity</td><td>int</td><td>Initial capacity size</td><td>no</td><td>null</td></tr>
+<tr><td>maximumSize</td><td>long</td><td>Specifies the maximum number of entries the cache may contain.</td><td>no</td><td>null (infinite capacity)</td></tr>
+<tr><td>expireAfterAccess</td><td>long</td><td>Specifies the eviction time after last read in milliseconds.</td><td>no</td><td>null (No read-time-based eviction when set to null)</td></tr>
+<tr><td>expireAfterWrite</td><td>long</td><td>Specifies the eviction time after last write in milliseconds.</td><td>no</td><td>null (No write-time-based eviction when set to null)</td></tr>
+</tbody>
+</table>
+<pre><code class="hljs css language-json">{
+   <span class="hljs-attr">"type"</span>:<span class="hljs-string">"loadingLookup"</span>,
+   <span class="hljs-attr">"dataFetcher"</span>:{ <span class="hljs-attr">"type"</span>:<span class="hljs-string">"jdbcDataFetcher"</span>, <span class="hljs-attr">"connectorConfig"</span>:<span class="hljs-string">"jdbc://mysql://localhost:3306/my_data_base"</span>, <span class="hljs-attr">"table"</span>:<span class="hljs-string">"lookup_table_name"</span>, <span class="hljs-attr">"keyColumn"</span>:<span class="hljs-string">"key_column_name"</span>, <span class="hljs-attr">"valueColumn"</span>: <span class="hljs-string">"value_column_name"</span>},
+   <span class="hljs-attr">"loadingCacheSpec"</span>:{<span class="hljs-attr">"type"</span>:<span class="hljs-string">"guava"</span>},
+   <span class="hljs-attr">"reverseLoadingCacheSpec"</span>:{<span class="hljs-attr">"type"</span>:<span class="hljs-string">"guava"</span>, <span class="hljs-attr">"maximumSize"</span>:<span class="hljs-number">500000</span>, <span class="hljs-attr">"expireAfterAccess"</span>:<span class="hljs-number">100000</span>, <span class="hljs-attr">"expireAfterAccess"</span>:<span class="hljs-number">10000</span>}
+}
+</code></pre>
+<h5><a class="anchor" aria-hidden="true" id="example-loading-off-heap-mapdb"></a><a href="#example-loading-off-heap-mapdb" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Example Loading Off-heap MapDB</h5>
+<p>Off heap cache is backed by <a href="http://www.mapdb.org/">MapDB</a> implementation. MapDB is using direct memory as memory pool, please take that into account when limiting the JVM direct memory setup.</p>
+<table>
+<thead>
+<tr><th>Field</th><th>Type</th><th>Description</th><th>Required</th><th>default</th></tr>
+</thead>
+<tbody>
+<tr><td>maxStoreSize</td><td>double</td><td>maximal size of store in GB, if store is larger entries will start expiring</td><td>no</td><td>0</td></tr>
+<tr><td>maxEntriesSize</td><td>long</td><td>Specifies the maximum number of entries the cache may contain.</td><td>no</td><td>0 (infinite capacity)</td></tr>
+<tr><td>expireAfterAccess</td><td>long</td><td>Specifies the eviction time after last read in milliseconds.</td><td>no</td><td>0 (No read-time-based eviction when set to null)</td></tr>
+<tr><td>expireAfterWrite</td><td>long</td><td>Specifies the eviction time after last write in milliseconds.</td><td>no</td><td>0 (No write-time-based eviction when set to null)</td></tr>
+</tbody>
+</table>
+<pre><code class="hljs css language-json">{
+   <span class="hljs-attr">"type"</span>:<span class="hljs-string">"loadingLookup"</span>,
+   <span class="hljs-attr">"dataFetcher"</span>:{ <span class="hljs-attr">"type"</span>:<span class="hljs-string">"jdbcDataFetcher"</span>, <span class="hljs-attr">"connectorConfig"</span>:<span class="hljs-string">"jdbc://mysql://localhost:3306/my_data_base"</span>, <span class="hljs-attr">"table"</span>:<span class="hljs-string">"lookup_table_name"</span>, <span class="hljs-attr">"keyColumn"</span>:<span class="hljs-string">"key_column_name"</span>, <span class="hljs-attr">"valueColumn"</span>: <span class="hljs-string">"value_column_name"</span>},
+   <span class="hljs-attr">"loadingCacheSpec"</span>:{<span class="hljs-attr">"type"</span>:<span class="hljs-string">"mapDb"</span>, <span class="hljs-attr">"maxEntriesSize"</span>:<span class="hljs-number">100000</span>},
+   <span class="hljs-attr">"reverseLoadingCacheSpec"</span>:{<span class="hljs-attr">"type"</span>:<span class="hljs-string">"mapDb"</span>, <span class="hljs-attr">"maxStoreSize"</span>:<span class="hljs-number">5</span>, <span class="hljs-attr">"expireAfterAccess"</span>:<span class="hljs-number">100000</span>, <span class="hljs-attr">"expireAfterAccess"</span>:<span class="hljs-number">10000</span>}
+}
+</code></pre>
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+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Druid pac4j based Security extension · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/0.20.0/development/extensions-core/druid-pac4j.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.20.0" /><meta property="og:title" content="Druid pac4j based Security extension · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
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+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
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+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
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+  -->
+<p>Apache Druid Extension to enable <a href="https://openid.net/connect/">OpenID Connect</a> based Authentication for Druid Processes using <a href="https://github.com/pac4j/pac4j">pac4j</a> as the underlying client library.
+This can be used  with any authentication server that supports same e.g. <a href="https://developer.okta.com/">Okta</a>.
+This extension should only be used at the router node to enable a group of users in existing authentication server to interact with Druid cluster, using the <a href="../../operations/druid-console.html">Web Console</a>. This extension does not support JDBC client authentication.</p>
+<h2><a class="anchor" aria-hidden="true" id="configuration"></a><a href="#configuration" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Configuration</h2>
+<h3><a class="anchor" aria-hidden="true" id="creating-an-authenticator"></a><a href="#creating-an-authenticator" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Creating an Authenticator</h3>
+<pre><code class="hljs"><span class="hljs-attr">druid.auth.authenticatorChain</span>=[<span class="hljs-string">"pac4j"</span>]
+<span class="hljs-attr">druid.auth.authenticator.pac4j.type</span>=pac4j
+</code></pre>
+<h3><a class="anchor" aria-hidden="true" id="properties"></a><a href="#properties" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Properties</h3>
+<table>
+<thead>
+<tr><th>Property</th><th>Description</th><th>Default</th><th>required</th></tr>
+</thead>
+<tbody>
+<tr><td><code>druid.auth.pac4j.cookiePassphrase</code></td><td>passphrase for encrypting the cookies used to manage authentication session with browser. It can be provided as plaintext string or The <a href="/docs/0.20.0/operations/password-provider.html">Password Provider</a>.</td><td>none</td><td>Yes</td></tr>
+<tr><td><code>druid.auth.pac4j.readTimeout</code></td><td>Socket connect and read timeout duration used when communicating with authentication server</td><td>PT5S</td><td>No</td></tr>
+<tr><td><code>druid.auth.pac4j.enableCustomSslContext</code></td><td>Whether to use custom SSLContext setup via <a href="/docs/0.20.0/development/extensions-core/simple-client-sslcontext.html">simple-client-sslcontext</a> extension which must be added to extensions list when this property is set to true.</td><td>false</td><td>No</td></tr>
+<tr><td><code>druid.auth.pac4j.oidc.clientID</code></td><td>OAuth Client Application id.</td><td>none</td><td>Yes</td></tr>
+<tr><td><code>druid.auth.pac4j.oidc.clientSecret</code></td><td>OAuth Client Application secret. It can be provided as plaintext string or The <a href="/docs/0.20.0/operations/password-provider.html">Password Provider</a>.</td><td>none</td><td>Yes</td></tr>
+<tr><td><code>druid.auth.pac4j.oidc.discoveryURI</code></td><td>discovery URI for fetching OP metadata <a href="http://openid.net/specs/openid-connect-discovery-1_0.html">see this</a>.</td><td>none</td><td>Yes</td></tr>
+</tbody>
+</table>
+</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/0.20.0/development/extensions-core/orc.html"><span class="arrow-prev">← </span><span>ORC Extension</span></a><a class="docs-next button" href="/docs/0.20.0/development/extensions-core/parquet.html"><span>Apache Parquet Extension</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#configuration">Configuration</a><ul class="toc-headings"><li><a href="#creating-an-authenticator">Creating an Authenticator</a></li><li><a href="#properties">Properties</a></li></ul></li></ul></nav></div><footer class="nav-footer druid-footer" id="footer"><div class="container"><div class="text-center"><p><a href="/technology">Technology</a> · <a href="/use-cases">Use Cases</a> · <a href="/druid-powered">Powered by Druid</a> · <a href="/docs/0.20.0/latest">Docs</a> · <a href="/community/">Community</a> · <a href="/downloads.html">Download</a> · <a href="/faq">FAQ</a></p></div><div class="text-center"><a title="Join the user group" href="https://groups.google.com/forum/#!forum/druid-user" target="_blank"><span class="fa fa-comments"></span></a> · <a title="Follow Druid" href="https://twitter.com/druidio" target="_blank"><span class="fab fa-twitter"></span></a> · <a title="Download via Apache" href="https://www.apache.org/dyn/closer.cgi?path=/incubator/druid/{{ site.druid_versions[0].versions[0].version }}/apache-druid-{{ site.druid_versions[0].versions[0].version }}-bin.tar.gz" target="_blank"><span class="fas fa-feather"></span></a> · <a title="GitHub" href="https://github.com/apache/druid" target="_blank"><span class="fab fa-github"></span></a></div><div class="text-center license">Copyright © 2019 <a href="https://www.apache.org/" target="_blank">Apache Software Foundation</a>.<br/>Except where otherwise noted, licensed under <a rel="license" href="http://creativecommons.org/licenses/by-sa/4.0/">CC BY-SA 4.0</a>.<br/>Apache Druid, Druid, and the Druid logo are either registered trademarks or trademarks of The Apache Software Foundation in the United States and other countries.</div></div></footer></div><script type="text/javascript" src="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.js"></script><script>
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+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
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+<p>This Apache Druid extension adds an Authorizer which implements access control for Druid, backed by <a href="https://ranger.apache.org/">Apache Ranger</a>. Please see <a href="/docs/0.20.0/design/auth.html">Authentication and Authorization</a> for more information on the basic facilities this extension provides.</p>
+<p>Make sure to <a href="/docs/0.20.0/development/extensions.html#loading-extensions">include</a> <code>druid-ranger-security</code> as an extension.</p>
+<blockquote>
+<p>The latest release of Apache Ranger is at the time of writing version 2.0. This version has a dependency on <code>log4j 1.2.17</code> which has a vulnerability if you configure it to use a <code>SocketServer</code> (CVE-2019-17571). Next to that, it also includes Kafka 2.0.0 which has 2 known vulnerabilities (CVE-2019-12399, CVE-2018-17196). Kafka can be used by the audit component in Ranger, but is not required.</p>
+</blockquote>
+<h2><a class="anchor" aria-hidden="true" id="configuration"></a><a href="#configuration" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Configuration</h2>
+<p>Support for Apache Ranger authorization consists of three elements:</p>
+<ul>
+<li>configuring the extension in Apache Druid</li>
+<li>configuring the connection to Apache Ranger</li>
+<li>providing the service definition for Druid to Apache Ranger</li>
+</ul>
+<h3><a class="anchor" aria-hidden="true" id="enabling-the-extension"></a><a href="#enabling-the-extension" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Enabling the extension</h3>
+<p>Ensure that you have a valid authenticator chain and escalator set in your <code>common.runtime.properties</code>. For every authenticator your wish to use the authorizer for, set <code>druid.auth.authenticator.&lt;authenticatorName&gt;.authorizerName</code> to the name you will give the authorizer, e.g. <code>ranger</code>.</p>
+<p>Then add the following and amend to your needs (in case you need to use multiple authorizers):</p>
+<pre><code class="hljs"><span class="hljs-attr">druid.auth.authorizers</span>=[<span class="hljs-string">"ranger"</span>]
+<span class="hljs-attr">druid.auth.authorizer.ranger.type</span>=ranger
+</code></pre>
+<p>The following is an example that showcases using <code>druid-basic-security</code> for authentication and <code>druid-ranger-security</code> for authorization.</p>
+<pre><code class="hljs"><span class="hljs-attr">druid.auth.authenticatorChain</span>=[<span class="hljs-string">"basic"</span>]
+<span class="hljs-attr">druid.auth.authenticator.basic.type</span>=basic
+<span class="hljs-attr">druid.auth.authenticator.basic.initialAdminPassword</span>=password1
+<span class="hljs-attr">druid.auth.authenticator.basic.initialInternalClientPassword</span>=password2
+<span class="hljs-attr">druid.auth.authenticator.basic.credentialsValidator.type</span>=metadata
+<span class="hljs-attr">druid.auth.authenticator.basic.skipOnFailure</span>=<span class="hljs-literal">false</span>
+<span class="hljs-attr">druid.auth.authenticator.basic.enableCacheNotifications</span>=<span class="hljs-literal">true</span>
+<span class="hljs-attr">druid.auth.authenticator.basic.authorizerName</span>=ranger
+
+<span class="hljs-attr">druid.auth.authorizers</span>=[<span class="hljs-string">"ranger"</span>]
+<span class="hljs-attr">druid.auth.authorizer.ranger.type</span>=ranger
+
+<span class="hljs-comment"># Escalator</span>
+<span class="hljs-attr">druid.escalator.type</span>=basic
+<span class="hljs-attr">druid.escalator.internalClientUsername</span>=druid_system
+<span class="hljs-attr">druid.escalator.internalClientPassword</span>=password2
+<span class="hljs-attr">druid.escalator.authorizerName</span>=ranger
+</code></pre>
+<blockquote>
+<p>Contrary to the documentation of <code>druid-basic-auth</code> Ranger does not automatically provision a highly privileged system user, you will need to do this yourself. This system user in the case of <code>druid-basic-auth</code> is named <code>druid_system</code> and for the escalator it is configurable, as shown above. Make sure to take note of these user names and configure <code>READ</code> access to <code>state:STATE</code> and to <code>config:security</code> in your ranger policies, otherwise system services will not work properly.</p>
+</blockquote>
+<h4><a class="anchor" aria-hidden="true" id="properties-to-configure-the-extension-in-apache-druid"></a><a href="#properties-to-configure-the-extension-in-apache-druid" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Properties to configure the extension in Apache Druid</h4>
+<table>
+<thead>
+<tr><th>Property</th><th>Description</th><th>Default</th><th>required</th></tr>
+</thead>
+<tbody>
+<tr><td><code>druid.auth.ranger.keytab</code></td><td>Defines the keytab to be used while authenticating against Apache Ranger to obtain policies and provide auditing</td><td>null</td><td>No</td></tr>
+<tr><td><code>druid.auth.ranger.principal</code></td><td>Defines the principal to be used while authenticating against Apache Ranger to obtain policies and provide auditing</td><td>null</td><td>No</td></tr>
+<tr><td><code>druid.auth.ranger.use_ugi</code></td><td>Determines if groups that the authenticated user belongs to should be obtained from Hadoop's <code>UserGroupInformation</code></td><td>null</td><td>No</td></tr>
+</tbody>
+</table>
+<h3><a class="anchor" aria-hidden="true" id="configuring-the-connection-to-apache-ranger"></a><a href="#configuring-the-connection-to-apache-ranger" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Configuring the connection to Apache Ranger</h3>
+<p>The Apache Ranger authorization extension will read several configuration files. Discussing the contents of those files is beyond the scope of this document. Depending on your needs you will need to create them. The minimum you will need to have is a <code>ranger-druid-security.xml</code> file that you will need to put in the classpath (e.g. <code>_common</code>). For auditing, the configuration is in <code>ranger-druid-audit.xml</code>.</p>
+<h3><a class="anchor" aria-hidden="true" id="adding-the-service-definition-for-apache-druid-to-apache-ranger"></a><a href="#adding-the-service-definition-for-apache-druid-to-apache-ranger" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Adding the service definition for Apache Druid to Apache Ranger</h3>
+<p>At the time of writing of this document Apache Ranger (2.0) does not include an out of the box service and service definition for Druid. You can add the service definition to Apache Ranger by entering the following command:</p>
+<p><code>curl -u &lt;user&gt;:&lt;password&gt; -d &quot;@ranger-servicedef-druid.json&quot; -X POST -H &quot;Accept: application/json&quot; -H &quot;Content-Type: application/json&quot; http://localhost:6080/service/public/v2/api/servicedef/</code></p>
+<p>You should get back <code>json</code> describing the service definition you just added. You can now go to the web interface of Apache Ranger which should now include a widget for &quot;Druid&quot;. Click the plus sign and create the new service. Ensure your service name is equal to what you configured in <code>ranger-druid-security.xml</code>.</p>
+<h4><a class="anchor" aria-hidden="true" id="configuring-apache-ranger-policies"></a><a href="#configuring-apache-ranger-policies" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Configuring Apache Ranger policies</h4>
+<p>When installing a new Druid service in Apache Ranger for the first time, Ranger will provision the policies to allow the administrative user <code>read/write</code> access to all properties and data sources. You might want to limit this. Do not forget to add the correct policies for the <code>druid_system</code> user and the <code>internalClientUserName</code> of the escalator.</p>
+<blockquote>
+<p>Loading new data sources requires <code>write</code> access to the <code>datasource</code> prior to the loading itself. So if you want to create a datasource <code>wikipedia</code> you are required to have an <code>allow</code> policy inside Apache Ranger before trying to load the spec.</p>
+</blockquote>
+<h2><a class="anchor" aria-hidden="true" id="usage"></a><a href="#usage" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Usage</h2>
+<h3><a class="anchor" aria-hidden="true" id="http-methods"></a><a href="#http-methods" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>HTTP methods</h3>
+<p>For information on what HTTP methods are supported for a particular request endpoint, please refer to the <a href="/docs/0.20.0/operations/api-reference.html">API documentation</a>.</p>
+<p>GET requires READ permission, while POST and DELETE require WRITE permission.</p>
+<h3><a class="anchor" aria-hidden="true" id="sql-permissions"></a><a href="#sql-permissions" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>SQL Permissions</h3>
+<p>Queries on Druid datasources require DATASOURCE READ permissions for the specified datasource.</p>
+<p>Queries on the <a href="../../querying/sql.html#information-schema">INFORMATION_SCHEMA tables</a> will return information about datasources that the caller has DATASOURCE READ access to. Other datasources will be omitted.</p>
+<p>Queries on the <a href="../../querying/sql.html#system-schema">system schema tables</a> require the following permissions:</p>
+<ul>
+<li><code>segments</code>: Segments will be filtered based on DATASOURCE READ permissions.</li>
+<li><code>servers</code>: The user requires STATE READ permissions.</li>
+<li><code>server_segments</code>: The user requires STATE READ permissions and segments will be filtered based on DATASOURCE READ permissions.</li>
+<li><code>tasks</code>: Tasks will be filtered based on DATASOURCE READ permissions.</li>
+</ul>
+<h3><a class="anchor" aria-hidden="true" id="debugging"></a><a href="#debugging" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Debugging</h3>
+<p>If you face difficulty grasping why access is denied to certain elements, and the <code>audit</code> section in Apache Ranger does not give you any detail, you can enable debug logging for <code>org.apache.druid.security.ranger</code>. To do so add the following in your <code>log4j2.xml</code>:</p>
+<pre><code class="hljs css language-xml"><span class="hljs-comment">&lt;!-- Set level="debug" to see access requests to Apache Ranger --&gt;</span>
+<span class="hljs-tag">&lt;<span class="hljs-name">Logger</span> <span class="hljs-attr">name</span>=<span class="hljs-string">"org.apache.druid.security"</span> <span class="hljs-attr">level</span>=<span class="hljs-string">"debug"</span> <span class="hljs-attr">additivity</span>=<span class="hljs-string">"false"</span>&gt;</span>
+  <span class="hljs-tag">&lt;<span class="hljs-name">Appender-ref</span> <span class="hljs-attr">ref</span>=<span class="hljs-string">"Console"</span>/&gt;</span>
+<span class="hljs-tag">&lt;/<span class="hljs-name">Logger</span>&gt;</span>
+</code></pre>
+</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/0.20.0/development/extensions-core/druid-lookups.html"><span class="arrow-prev">← </span><span>Cached Lookup Module</span></a><a class="docs-next button" href="/docs/0.20.0/development/extensions-core/google.html"><span>Google Cloud Storage</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#configuration">Configuration</a><ul class="toc-headings"><li><a href="#enabling-the-extension">Enabling the extension</a></li><li><a href="#configuring-the-connection-to-apache-ranger">Configuring the connection to Apache Ranger</a></li><li><a href="#adding-the-service-definition-for-apache-druid-to-apache-ranger">Adding the service definition for Apache Druid to Apache Ranger</a></li></ul></li><li><a href="#usage">Usage</a><ul class="toc-headings"><li><a href="#http-methods">HTTP methods</a></li><li><a href="#sql-permissions">SQL Permissions</a></li><li><a href="#debugging">Debugging</a></li></ul></li></ul></nav></div><footer class="nav-footer druid-footer" id="footer"><div class="container"><div class="text-center"><p><a href="/technology">Technology</a> · <a href="/use-cases">Use Cases</a> · <a href="/druid-powered">Powered by Druid</a> · <a href="/docs/0.20.0/latest">Docs</a> · <a href="/community/">Community</a> · <a href="/downloads.html">Download</a> · <a href="/faq">FAQ</a></p></div><div class="text-center"><a title="Join the user group" href="https://groups.google.com/forum/#!forum/druid-user" target="_blank"><span class="fa fa-comments"></span></a> · <a title="Follow Druid" href="https://twitter.com/druidio" target="_blank"><span class="fab fa-twitter"></span></a> · <a title="Download via Apache" href="https://www.apache.org/dyn/closer.cgi?path=/incubator/druid/{{ site.druid_versions[0].versions[0].version }}/apache-druid-{{ site.druid_versions[0].versions[0].version }}-bin.tar.gz" target="_blank"><span class="fas fa-feather"></span></a> · <a title="GitHub" href="https://github.com/apache/druid" target="_blank"><span class="fab fa-github"></span></a></div><div class="text-center license">Copyright © 2019 <a href="https://www.apache.org/" target="_blank">Apache Software Foundation</a>.<br/>Except where otherwise noted, licensed under <a rel="license" href="http://creativecommons.org/licenses/by-sa/4.0/">CC BY-SA 4.0</a>.<br/>Apache Druid, Druid, and the Druid logo are either registered trademarks or trademarks of The Apache Software Foundation in the United States and other countries.</div></div></footer></div><script type="text/javascript" src="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.js"></script><script>
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+                    return;
+                  }
+                  // keyCode for '/' (slash)
+                  if (e.keyCode === 191) {
+                    const search = document.getElementById('search_input_react');
+                    search && search.focus();
+                  }
+                });
+              </script><script>
+              var search = docsearch({
+                
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+            </script></body></html>
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diff --git a/docs/0.20.0/development/extensions-core/examples.html b/docs/0.20.0/development/extensions-core/examples.html
new file mode 100644
index 0000000..c84ac90
--- /dev/null
+++ b/docs/0.20.0/development/extensions-core/examples.html
@@ -0,0 +1,44 @@
+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Extension Examples · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/0.20.0/development/extensions-core/examples.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.20.0" /><meta property="og:title" content="Extension Examples · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
+              window.dataLayer = window.dataLayer || [];
+              function gtag(){dataLayer.push(arguments); }
+              gtag('js', new Date());
+              gtag('config', 'UA-131010415-1');
+            </script><link rel="stylesheet" href="https://use.fontawesome.com/releases/v5.7.2/css/all.css"/><link rel="stylesheet" href="/css/code-block-buttons.css"/><script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/clipboard.js/2.0.4/clipboard.min.js"></script><script type="text/javascript" src="/js/code-block-buttons.js"></script><script src="/js/scrollSpy.js"></script><link rel="stylesheet" href="/css/main.css"/><script src="/js/codetabs.js"></script></head><body class="sideNavVisible separateOnPageNav"><div class="fixedHeaderContainer"><div class="headerWrapper wrapper"><header><a href="/"><img class="logo" src="/img/druid_nav.png" alt="Apache Druid"/></a><div class="navigationWrapper navigationSlider"><nav class="slidingNav"><ul class="nav-site nav-site-internal"><li class=""><a href="/technology" target="_self">Technology</a></li><li class=""><a href="/use-cases" target="_self">Use Cases</a></li><li class=""><a href="/druid-powered" target="_self">Powered By</a></li><li class=""><a href="/docs/0.20.0/design/index.html" target="_self">Docs</a></li><li class=""><a href="/community/" target="_self">Community</a></li><li class=""><a href="https://www.apache.org" target="_self">Apache</a></li><li class=""><a href="/downloads.html" target="_self">Download</a></li><li class="navSearchWrapper reactNavSearchWrapper"><input type="text" id="search_input_react" placeholder="Search" title="Search"/></li></ul></nav></div></header></div></div><div class="navPusher"><div class="docMainWrapper wrapper"><div class="container mainContainer docsContainer"><div class="wrapper"><div class="post"><header class="postHeader"><a class="edit-page-link button" href="https://github.com/apache/druid/edit/master/docs/development/extensions-core/examples.md" target="_blank" rel="noreferrer noopener">Edit</a><h1 id="__docusaurus" class="postHeaderTitle">Extension Examples</h1></header><article><div><span><!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+  -->
+<p>This extension was removed in Apache Druid 0.16.0. In prior versions, the extension provided obsolete facilities to ingest data from the Twitter 'Spritzer' data stream as well as the Wikipedia changes IRC channel.</p>
+</span></div></article></div><div class="docs-prevnext"></div></div></div><nav class="onPageNav"></nav></div><footer class="nav-footer druid-footer" id="footer"><div class="container"><div class="text-center"><p><a href="/technology">Technology</a> · <a href="/use-cases">Use Cases</a> · <a href="/druid-powered">Powered by Druid</a> · <a href="/docs/0.20.0/latest">Docs</a> · <a href="/community/">Community</a> · <a href="/downloads.html">Download</a> · <a href="/faq">FAQ</a></p></div><div class="text-center"><a title="Join the user group" href="https://groups.google.com/forum/#!forum/druid-user" target="_blank"><span class="fa fa-comments"></span></a> · <a title="Follow Druid" href="https://twitter.com/druidio" target="_blank"><span class="fab fa-twitter"></span></a> · <a title="Download via Apache" href="https://www.apache.org/dyn/closer.cgi?path=/incubator/druid/{{ site.druid_versions[0].versions[0].version }}/apache-druid-{{ site.druid_versions[0].versions[0].version }}-bin.tar.gz" target="_blank"><span class="fas fa-feather"></span></a> · <a title="GitHub" href="https://github.com/apache/druid" target="_blank"><span class="fab fa-github"></span></a></div><div class="text-center license">Copyright © 2019 <a href="https://www.apache.org/" target="_blank">Apache Software Foundation</a>.<br/>Except where otherwise noted, licensed under <a rel="license" href="http://creativecommons.org/licenses/by-sa/4.0/">CC BY-SA 4.0</a>.<br/>Apache Druid, Druid, and the Druid logo are either registered trademarks or trademarks of The Apache Software Foundation in the United States and other countries.</div></div></footer></div><script type="text/javascript" src="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.js"></script><script>
+                document.addEventListener('keyup', function(e) {
+                  if (e.target !== document.body) {
+                    return;
+                  }
+                  // keyCode for '/' (slash)
+                  if (e.keyCode === 191) {
+                    const search = document.getElementById('search_input_react');
+                    search && search.focus();
+                  }
+                });
+              </script><script>
+              var search = docsearch({
+                
+                apiKey: '2de99082a9f38e49dfaa059bbe4c901d',
+                indexName: 'apache_druid',
+                inputSelector: '#search_input_react',
+                algoliaOptions: {"facetFilters":["language:en","version:0.20.0"]}
+              });
+            </script></body></html>
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diff --git a/docs/0.20.0/development/extensions-core/google.html b/docs/0.20.0/development/extensions-core/google.html
new file mode 100644
index 0000000..c1371f5
--- /dev/null
+++ b/docs/0.20.0/development/extensions-core/google.html
@@ -0,0 +1,128 @@
+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Google Cloud Storage · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/0.20.0/development/extensions-core/google.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.20.0" /><meta property="og:title" content="Google Cloud Storage · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
+              window.dataLayer = window.dataLayer || [];
+              function gtag(){dataLayer.push(arguments); }
+              gtag('js', new Date());
+              gtag('config', 'UA-131010415-1');
+            </script><link rel="stylesheet" href="https://use.fontawesome.com/releases/v5.7.2/css/all.css"/><link rel="stylesheet" href="/css/code-block-buttons.css"/><script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/clipboard.js/2.0.4/clipboard.min.js"></script><script type="text/javascript" src="/js/code-block-buttons.js"></script><script src="/js/scrollSpy.js"></script><link rel="stylesheet" href="/css/main.css"/><script src="/js/codetabs.js"></script></head><body class="sideNavVisible separateOnPageNav"><div class="fixedHeaderContainer"><div class="headerWrapper wrapper"><header><a href="/"><img class="logo" src="/img/druid_nav.png" alt="Apache Druid"/></a><div class="navigationWrapper navigationSlider"><nav class="slidingNav"><ul class="nav-site nav-site-internal"><li class=""><a href="/technology" target="_self">Technology</a></li><li class=""><a href="/use-cases" target="_self">Use Cases</a></li><li class=""><a href="/druid-powered" 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class="icon-toc"></i></div></div><div class="navGroups"><div class="navGroup"><h3 class="navGroupCategoryTitle collapsible">Getting started<span class="arrow"><svg width="24" height="24" viewBox="0 0 24 24"><path fill="#565656" d="M7.41 15.41L12 10.83l4.59 4.58L18 14l-6-6-6 6z"></path><path d="M0 0h24v24H0z" fill="none"></path></svg></span></h3><ul class="hide"><li class="navListItem"><a class="navItem" href="/docs/0.20.0/design/index.html">Introduction to Apache Druid</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/tutorials/index.html">Quickstart</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/tutorials/docker.html">Docker</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/operations/single-server.html">Single server deployment</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/tutorials/cluster.html">Clustered deployment</a></li></ul></div><div class="navGroup"><h3 class="navGroupCategoryTitle collapsible">Tutorials<span class="arrow"><svg width="24" height="24" viewBox="0 0 24 24"><path fill="#565656" d="M7.41 15.41L12 10.83l4.59 4.58L18 14l-6-6-6 6z"></path><path d="M0 0h24v24H0z" fill="none"></path></svg></span></h3><ul class="hide"><li class="navListItem"><a class="navItem" href="/docs/0.20.0/tutorials/tutorial-batch.html">Loading files natively</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/tutorials/tutorial-kafka.html">Load from Apache Kafka</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/tutorials/tutorial-batch-hadoop.html">Load from Apache Hadoop</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/tutorials/tutorial-query.html">Querying data</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/tutorials/tutorial-rollup.html">Roll-up</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/tutorials/tutorial-retention.html">Configuring data retention</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/tutorials/tutorial-update-data.html">Updating existing data</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/tutorials/tutorial-compaction.html">Compacting segments</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/tutorials/tutorial-delete-data.html">Deleting data</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/tutorials/tutorial-ingestion-spec.html">Writing an ingestion spec</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/tutorials/tutorial-transform-spec.html">Transforming input data</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/tutorials/tutorial-kerberos-hadoop.html">Kerberized HDFS deep storage</a></li></ul></div><div class="navGroup"><h3 class="navGroupCategoryTitle collapsible">Design<span class="arrow"><svg width="24" height="24" viewBox="0 0 24 24"><path fill="#565656" d="M7.41 15.41L12 10.83l4.59 4.58L18 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+  -->
+<h2><a class="anchor" aria-hidden="true" id="google-cloud-storage-extension"></a><a href="#google-cloud-storage-extension" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Google Cloud Storage Extension</h2>
+<p>This extension allows you to do 2 things:</p>
+<ul>
+<li><a href="#reading-data-from-google-cloud-storage">Ingest data</a> from files stored in Google Cloud Storage.</li>
+<li>Write segments to <a href="#deep-storage">deep storage</a> in GCS.</li>
+</ul>
+<p>To use this Apache Druid extension, make sure to <a href="/docs/0.20.0/development/extensions.html#loading-extensions">include</a> <code>druid-google-extensions</code> extension.</p>
+<h3><a class="anchor" aria-hidden="true" id="required-configuration"></a><a href="#required-configuration" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Required Configuration</h3>
+<p>To configure connectivity to google cloud, run druid processes with <code>GOOGLE_APPLICATION_CREDENTIALS=/path/to/service_account_keyfile</code> in the environment.</p>
+<h3><a class="anchor" aria-hidden="true" id="reading-data-from-google-cloud-storage"></a><a href="#reading-data-from-google-cloud-storage" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Reading data from Google Cloud Storage</h3>
+<p>The <a href="/docs/0.20.0/ingestion/native-batch.html#google-cloud-storage-input-source">Google Cloud Storage input source</a> is supported by the <a href="/docs/0.20.0/ingestion/native-batch.html#parallel-task">Parallel task</a>
+to read objects directly from Google Cloud Storage. If you use the <a href="/docs/0.20.0/ingestion/hadoop.html">Hadoop task</a>,
+you can read data from Google Cloud Storage by specifying the paths in your <a href="/docs/0.20.0/ingestion/hadoop.html#inputspec"><code>inputSpec</code></a>.</p>
+<p>Objects can also be read directly from Google Cloud Storage via the <a href="/docs/0.20.0/ingestion/native-batch.html#staticgoogleblobstorefirehose">StaticGoogleBlobStoreFirehose</a></p>
+<h3><a class="anchor" aria-hidden="true" id="deep-storage"></a><a href="#deep-storage" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Deep Storage</h3>
+<p>Deep storage can be written to Google Cloud Storage either via this extension or the <a href="/docs/0.20.0/development/extensions-core/hdfs.html">druid-hdfs-storage extension</a>.</p>
+<h4><a class="anchor" aria-hidden="true" id="configuration"></a><a href="#configuration" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Configuration</h4>
+<p>To configure connectivity to google cloud, run druid processes with <code>GOOGLE_APPLICATION_CREDENTIALS=/path/to/service_account_keyfile</code> in the environment.</p>
+<table>
+<thead>
+<tr><th>Property</th><th>Description</th><th>Possible Values</th><th>Default</th></tr>
+</thead>
+<tbody>
+<tr><td><code>druid.storage.type</code></td><td>google</td><td></td><td>Must be set.</td></tr>
+<tr><td><code>druid.google.bucket</code></td><td></td><td>Google Storage bucket name.</td><td>Must be set.</td></tr>
+<tr><td><code>druid.google.prefix</code></td><td>A prefix string that will be prepended to the blob names for the segments published to Google deep storage</td><td></td><td>&quot;&quot;</td></tr>
+<tr><td><code>druid.google.maxListingLength</code></td><td>maximum number of input files matching a given prefix to retrieve at a time</td><td></td><td>1024</td></tr>
+</tbody>
+</table>
+</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/0.20.0/development/extensions-core/druid-ranger-security.html"><span class="arrow-prev">← </span><span>Apache Ranger Security</span></a><a class="docs-next button" href="/docs/0.20.0/development/extensions-core/hdfs.html"><span>HDFS</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#google-cloud-storage-extension">Google Cloud Storage Extension</a><ul class="toc-headings"><li><a href="#required-configuration">Required Configuration</a></li><li><a href="#reading-data-from-google-cloud-storage">Reading data from Google Cloud Storage</a></li><li><a href="#deep-storage">Deep Storage</a></li></ul></li></ul></nav></div><footer class="nav-footer druid-footer" id="footer"><div class="container"><div class="text-center"><p><a href="/technology">Technology</a> · <a href="/use-cases">Use Cases</a> · <a href="/druid-powered">Powered by Druid</a> · <a href="/docs/0.20.0/latest">Docs</a> · <a href="/community/">Community</a> · <a href="/downloads.html">Download</a> · <a href="/faq">FAQ</a></p></div><div class="text-center"><a title="Join the user group" href="https://groups.google.com/forum/#!forum/druid-user" target="_blank"><span class="fa fa-comments"></span></a> · <a title="Follow Druid" href="https://twitter.com/druidio" target="_blank"><span class="fab fa-twitter"></span></a> · <a title="Download via Apache" href="https://www.apache.org/dyn/closer.cgi?path=/incubator/druid/{{ site.druid_versions[0].versions[0].version }}/apache-druid-{{ site.druid_versions[0].versions[0].version }}-bin.tar.gz" target="_blank"><span class="fas fa-feather"></span></a> · <a title="GitHub" href="https://github.com/apache/druid" target="_blank"><span class="fab fa-github"></span></a></div><div class="text-center license">Copyright © 2019 <a href="https://www.apache.org/" target="_blank">Apache Software Foundation</a>.<br/>Except where otherwise noted, licensed under <a rel="license" href="http://creativecommons.org/licenses/by-sa/4.0/">CC BY-SA 4.0</a>.<br/>Apache Druid, Druid, and the Druid logo are either registered trademarks or trademarks of The Apache Software Foundation in the United States and other countries.</div></div></footer></div><script type="text/javascript" src="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.js"></script><script>
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+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>HDFS · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/0.20.0/development/extensions-core/hdfs.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.20.0" /><meta property="og:title" content="HDFS · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
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+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
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+  -->
+<p>To use this Apache Druid extension, make sure to <a href="/docs/0.20.0/development/extensions.html#loading-extensions">include</a> <code>druid-hdfs-storage</code> as an extension and run druid processes with <code>GOOGLE_APPLICATION_CREDENTIALS=/path/to/service_account_keyfile</code> in the environment.</p>
+<h2><a class="anchor" aria-hidden="true" id="deep-storage"></a><a href="#deep-storage" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Deep Storage</h2>
+<h3><a class="anchor" aria-hidden="true" id="configuration-for-hdfs"></a><a href="#configuration-for-hdfs" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Configuration for HDFS</h3>
+<table>
+<thead>
+<tr><th>Property</th><th>Possible Values</th><th>Description</th><th>Default</th></tr>
+</thead>
+<tbody>
+<tr><td><code>druid.storage.type</code></td><td>hdfs</td><td></td><td>Must be set.</td></tr>
+<tr><td><code>druid.storage.storageDirectory</code></td><td></td><td>Directory for storing segments.</td><td>Must be set.</td></tr>
+<tr><td><code>druid.hadoop.security.kerberos.principal</code></td><td><code>druid@EXAMPLE.COM</code></td><td>Principal user name</td><td>empty</td></tr>
+<tr><td><code>druid.hadoop.security.kerberos.keytab</code></td><td><code>/etc/security/keytabs/druid.headlessUser.keytab</code></td><td>Path to keytab file</td><td>empty</td></tr>
+</tbody>
+</table>
+<p>Besides the above settings, you also need to include all Hadoop configuration files (such as <code>core-site.xml</code>, <code>hdfs-site.xml</code>)
+in the Druid classpath. One way to do this is copying all those files under <code>${DRUID_HOME}/conf/_common</code>.</p>
+<p>If you are using the Hadoop ingestion, set your output directory to be a location on Hadoop and it will work.
+If you want to eagerly authenticate against a secured hadoop/hdfs cluster you must set <code>druid.hadoop.security.kerberos.principal</code> and <code>druid.hadoop.security.kerberos.keytab</code>, this is an alternative to the cron job method that runs <code>kinit</code> command periodically.</p>
+<h3><a class="anchor" aria-hidden="true" id="configuration-for-cloud-storage"></a><a href="#configuration-for-cloud-storage" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Configuration for Cloud Storage</h3>
+<p>You can also use the AWS S3 or the Google Cloud Storage as the deep storage via HDFS.</p>
+<h4><a class="anchor" aria-hidden="true" id="configuration-for-aws-s3"></a><a href="#configuration-for-aws-s3" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Configuration for AWS S3</h4>
+<p>To use the AWS S3 as the deep storage, you need to configure <code>druid.storage.storageDirectory</code> properly.</p>
+<table>
+<thead>
+<tr><th>Property</th><th>Possible Values</th><th>Description</th><th>Default</th></tr>
+</thead>
+<tbody>
+<tr><td><code>druid.storage.type</code></td><td>hdfs</td><td></td><td>Must be set.</td></tr>
+<tr><td><code>druid.storage.storageDirectory</code></td><td><a href="s3a://bucket/example/directory">s3a://bucket/example/directory</a> or <a href="s3n://bucket/example/directory">s3n://bucket/example/directory</a></td><td>Path to the deep storage</td><td>Must be set.</td></tr>
+</tbody>
+</table>
+<p>You also need to include the <a href="https://hadoop.apache.org/docs/current/hadoop-aws/tools/hadoop-aws/index.html">Hadoop AWS module</a>, especially the <code>hadoop-aws.jar</code> in the Druid classpath.
+Run the below command to install the <code>hadoop-aws.jar</code> file under <code>${DRUID_HOME}/extensions/druid-hdfs-storage</code> in all nodes.</p>
+<pre><code class="hljs css language-bash">java -classpath <span class="hljs-string">"<span class="hljs-variable">${DRUID_HOME}</span>lib/*"</span> org.apache.druid.cli.Main tools pull-deps -h <span class="hljs-string">"org.apache.hadoop:hadoop-aws:<span class="hljs-variable">${HADOOP_VERSION}</span>"</span>;
+cp <span class="hljs-variable">${DRUID_HOME}</span>/hadoop-dependencies/hadoop-aws/<span class="hljs-variable">${HADOOP_VERSION}</span>/hadoop-aws-<span class="hljs-variable">${HADOOP_VERSION}</span>.jar <span class="hljs-variable">${DRUID_HOME}</span>/extensions/druid-hdfs-storage/
+</code></pre>
+<p>Finally, you need to add the below properties in the <code>core-site.xml</code>.
+For more configurations, see the <a href="https://hadoop.apache.org/docs/current/hadoop-aws/tools/hadoop-aws/index.html">Hadoop AWS module</a>.</p>
+<pre><code class="hljs css language-xml"><span class="hljs-tag">&lt;<span class="hljs-name">property</span>&gt;</span>
+  <span class="hljs-tag">&lt;<span class="hljs-name">name</span>&gt;</span>fs.s3a.impl<span class="hljs-tag">&lt;/<span class="hljs-name">name</span>&gt;</span>
+  <span class="hljs-tag">&lt;<span class="hljs-name">value</span>&gt;</span>org.apache.hadoop.fs.s3a.S3AFileSystem<span class="hljs-tag">&lt;/<span class="hljs-name">value</span>&gt;</span>
+  <span class="hljs-tag">&lt;<span class="hljs-name">description</span>&gt;</span>The implementation class of the S3A Filesystem<span class="hljs-tag">&lt;/<span class="hljs-name">description</span>&gt;</span>
+<span class="hljs-tag">&lt;/<span class="hljs-name">property</span>&gt;</span>
+
+<span class="hljs-tag">&lt;<span class="hljs-name">property</span>&gt;</span>
+  <span class="hljs-tag">&lt;<span class="hljs-name">name</span>&gt;</span>fs.AbstractFileSystem.s3a.impl<span class="hljs-tag">&lt;/<span class="hljs-name">name</span>&gt;</span>
+  <span class="hljs-tag">&lt;<span class="hljs-name">value</span>&gt;</span>org.apache.hadoop.fs.s3a.S3A<span class="hljs-tag">&lt;/<span class="hljs-name">value</span>&gt;</span>
+  <span class="hljs-tag">&lt;<span class="hljs-name">description</span>&gt;</span>The implementation class of the S3A AbstractFileSystem.<span class="hljs-tag">&lt;/<span class="hljs-name">description</span>&gt;</span>
+<span class="hljs-tag">&lt;/<span class="hljs-name">property</span>&gt;</span>
+
+<span class="hljs-tag">&lt;<span class="hljs-name">property</span>&gt;</span>
+  <span class="hljs-tag">&lt;<span class="hljs-name">name</span>&gt;</span>fs.s3a.access.key<span class="hljs-tag">&lt;/<span class="hljs-name">name</span>&gt;</span>
+  <span class="hljs-tag">&lt;<span class="hljs-name">description</span>&gt;</span>AWS access key ID. Omit for IAM role-based or provider-based authentication.<span class="hljs-tag">&lt;/<span class="hljs-name">description</span>&gt;</span>
+  <span class="hljs-tag">&lt;<span class="hljs-name">value</span>&gt;</span>your access key<span class="hljs-tag">&lt;/<span class="hljs-name">value</span>&gt;</span>
+<span class="hljs-tag">&lt;/<span class="hljs-name">property</span>&gt;</span>
+
+<span class="hljs-tag">&lt;<span class="hljs-name">property</span>&gt;</span>
+  <span class="hljs-tag">&lt;<span class="hljs-name">name</span>&gt;</span>fs.s3a.secret.key<span class="hljs-tag">&lt;/<span class="hljs-name">name</span>&gt;</span>
+  <span class="hljs-tag">&lt;<span class="hljs-name">description</span>&gt;</span>AWS secret key. Omit for IAM role-based or provider-based authentication.<span class="hljs-tag">&lt;/<span class="hljs-name">description</span>&gt;</span>
+  <span class="hljs-tag">&lt;<span class="hljs-name">value</span>&gt;</span>your secret key<span class="hljs-tag">&lt;/<span class="hljs-name">value</span>&gt;</span>
+<span class="hljs-tag">&lt;/<span class="hljs-name">property</span>&gt;</span>
+</code></pre>
+<h4><a class="anchor" aria-hidden="true" id="configuration-for-google-cloud-storage"></a><a href="#configuration-for-google-cloud-storage" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Configuration for Google Cloud Storage</h4>
+<p>To use the Google Cloud Storage as the deep storage, you need to configure <code>druid.storage.storageDirectory</code> properly.</p>
+<table>
+<thead>
+<tr><th>Property</th><th>Possible Values</th><th>Description</th><th>Default</th></tr>
+</thead>
+<tbody>
+<tr><td><code>druid.storage.type</code></td><td>hdfs</td><td></td><td>Must be set.</td></tr>
+<tr><td><code>druid.storage.storageDirectory</code></td><td><a href="gs://bucket/example/directory">gs://bucket/example/directory</a></td><td>Path to the deep storage</td><td>Must be set.</td></tr>
+</tbody>
+</table>
+<p>All services that need to access GCS need to have the <a href="https://cloud.google.com/dataproc/docs/concepts/connectors/cloud-storage#other_sparkhadoop_clusters">GCS connector jar</a> in their class path.
+Please read the <a href="https://github.com/GoogleCloudPlatform/bigdata-interop/blob/master/gcs/INSTALL.md">install instructions</a>
+to properly set up the necessary libraries and configurations.
+One option is to place this jar in <code>${DRUID_HOME}/lib/</code> and <code>${DRUID_HOME}/extensions/druid-hdfs-storage/</code>.</p>
+<p>Finally, you need to configure the <code>core-site.xml</code> file with the filesystem
+and authentication properties needed for GCS. You may want to copy the below
+example properties. Please follow the instructions at
+<a href="https://github.com/GoogleCloudPlatform/bigdata-interop/blob/master/gcs/INSTALL.md">https://github.com/GoogleCloudPlatform/bigdata-interop/blob/master/gcs/INSTALL.md</a>
+for more details.
+For more configurations, <a href="https://github.com/GoogleCloudPlatform/bigdata-interop/blob/master/gcs/conf/gcs-core-default.xml">GCS core default</a>
+and <a href="https://github.com/GoogleCloudPlatform/bdutil/blob/master/conf/hadoop2/gcs-core-template.xml">GCS core template</a>.</p>
+<pre><code class="hljs css language-xml"><span class="hljs-tag">&lt;<span class="hljs-name">property</span>&gt;</span>
+  <span class="hljs-tag">&lt;<span class="hljs-name">name</span>&gt;</span>fs.gs.impl<span class="hljs-tag">&lt;/<span class="hljs-name">name</span>&gt;</span>
+  <span class="hljs-tag">&lt;<span class="hljs-name">value</span>&gt;</span>com.google.cloud.hadoop.fs.gcs.GoogleHadoopFileSystem<span class="hljs-tag">&lt;/<span class="hljs-name">value</span>&gt;</span>
+  <span class="hljs-tag">&lt;<span class="hljs-name">description</span>&gt;</span>The FileSystem for gs: (GCS) uris.<span class="hljs-tag">&lt;/<span class="hljs-name">description</span>&gt;</span>
+<span class="hljs-tag">&lt;/<span class="hljs-name">property</span>&gt;</span>
+
+<span class="hljs-tag">&lt;<span class="hljs-name">property</span>&gt;</span>
+  <span class="hljs-tag">&lt;<span class="hljs-name">name</span>&gt;</span>fs.AbstractFileSystem.gs.impl<span class="hljs-tag">&lt;/<span class="hljs-name">name</span>&gt;</span>
+  <span class="hljs-tag">&lt;<span class="hljs-name">value</span>&gt;</span>com.google.cloud.hadoop.fs.gcs.GoogleHadoopFS<span class="hljs-tag">&lt;/<span class="hljs-name">value</span>&gt;</span>
+  <span class="hljs-tag">&lt;<span class="hljs-name">description</span>&gt;</span>The AbstractFileSystem for gs: uris.<span class="hljs-tag">&lt;/<span class="hljs-name">description</span>&gt;</span>
+<span class="hljs-tag">&lt;/<span class="hljs-name">property</span>&gt;</span>
+
+<span class="hljs-tag">&lt;<span class="hljs-name">property</span>&gt;</span>
+  <span class="hljs-tag">&lt;<span class="hljs-name">name</span>&gt;</span>google.cloud.auth.service.account.enable<span class="hljs-tag">&lt;/<span class="hljs-name">name</span>&gt;</span>
+  <span class="hljs-tag">&lt;<span class="hljs-name">value</span>&gt;</span>true<span class="hljs-tag">&lt;/<span class="hljs-name">value</span>&gt;</span>
+  <span class="hljs-tag">&lt;<span class="hljs-name">description</span>&gt;</span>
+    Whether to use a service account for GCS authorization.
+    Setting this property to `false` will disable use of service accounts for
+    authentication.
+  <span class="hljs-tag">&lt;/<span class="hljs-name">description</span>&gt;</span>
+<span class="hljs-tag">&lt;/<span class="hljs-name">property</span>&gt;</span>
+
+<span class="hljs-tag">&lt;<span class="hljs-name">property</span>&gt;</span>
+  <span class="hljs-tag">&lt;<span class="hljs-name">name</span>&gt;</span>google.cloud.auth.service.account.json.keyfile<span class="hljs-tag">&lt;/<span class="hljs-name">name</span>&gt;</span>
+  <span class="hljs-tag">&lt;<span class="hljs-name">value</span>&gt;</span>/path/to/keyfile<span class="hljs-tag">&lt;/<span class="hljs-name">value</span>&gt;</span>
+  <span class="hljs-tag">&lt;<span class="hljs-name">description</span>&gt;</span>
+    The JSON key file of the service account used for GCS
+    access when google.cloud.auth.service.account.enable is true.
+  <span class="hljs-tag">&lt;/<span class="hljs-name">description</span>&gt;</span>
+<span class="hljs-tag">&lt;/<span class="hljs-name">property</span>&gt;</span>
+</code></pre>
+<p>Tested with Druid 0.17.0, Hadoop 2.8.5 and gcs-connector jar 2.0.0-hadoop2.</p>
+<h2><a class="anchor" aria-hidden="true" id="reading-data-from-hdfs-or-cloud-storage"></a><a href="#reading-data-from-hdfs-or-cloud-storage" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Reading data from HDFS or Cloud Storage</h2>
+<h3><a class="anchor" aria-hidden="true" id="native-batch-ingestion"></a><a href="#native-batch-ingestion" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Native batch ingestion</h3>
+<p>The <a href="/docs/0.20.0/ingestion/native-batch.html#hdfs-input-source">HDFS input source</a> is supported by the <a href="/docs/0.20.0/ingestion/native-batch.html#parallel-task">Parallel task</a>
+to read files directly from the HDFS Storage. You may be able to read objects from cloud storage
+with the HDFS input source, but we highly recommend to use a proper
+<a href="/docs/0.20.0/ingestion/native-batch.html#input-sources">Input Source</a> instead if possible because
+it is simple to set up. For now, only the <a href="/docs/0.20.0/ingestion/native-batch.html#s3-input-source">S3 input source</a>
+and the <a href="/docs/0.20.0/ingestion/native-batch.html#google-cloud-storage-input-source">Google Cloud Storage input source</a>
+are supported for cloud storage types, and so you may still want to use the HDFS input source
+to read from cloud storage other than those two.</p>
+<h3><a class="anchor" aria-hidden="true" id="hadoop-based-ingestion"></a><a href="#hadoop-based-ingestion" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Hadoop-based ingestion</h3>
+<p>If you use the <a href="/docs/0.20.0/ingestion/hadoop.html">Hadoop ingestion</a>, you can read data from HDFS
+by specifying the paths in your <a href="/docs/0.20.0/ingestion/hadoop.html#inputspec"><code>inputSpec</code></a>.
+See the <a href="/docs/0.20.0/ingestion/hadoop.html#static">Static</a> inputSpec for details.</p>
+</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/0.20.0/development/extensions-core/google.html"><span class="arrow-prev">← </span><span>Google Cloud Storage</span></a><a class="docs-next button" href="/docs/0.20.0/development/extensions-core/kafka-extraction-namespace.html"><span>Apache Kafka Lookups</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#deep-storage">Deep Storage</a><ul class="toc-headings"><li><a href="#configuration-for-hdfs">Configuration for HDFS</a></li><li><a href="#configuration-for-cloud-storage">Configuration for Cloud Storage</a></li></ul></li><li><a href="#reading-data-from-hdfs-or-cloud-storage">Reading data from HDFS or Cloud Storage</a><ul class="toc-headings"><li><a href="#native-batch-ingestion">Native batch ingestion</a></li><li><a href="#hadoop-based-ingestion">Hadoop-based ingestion</a></li></ul></li></ul></nav></div><footer class="nav-footer druid-footer" id="footer"><div class="container"><div class="text-center"><p><a href="/technology">Technology</a> · <a href="/use-cases">Use Cases</a> · <a href="/druid-powered">Powered by Druid</a> · <a href="/docs/0.20.0/latest">Docs</a> · <a href="/community/">Community</a> · <a href="/downloads.html">Download</a> · <a href="/faq">FAQ</a></p></div><div class="text-center"><a title="Join the user group" href="https://groups.google.com/forum/#!forum/druid-user" target="_blank"><span class="fa fa-comments"></span></a> · <a title="Follow Druid" href="https://twitter.com/druidio" target="_blank"><span class="fab fa-twitter"></span></a> · <a title="Download via Apache" href="https://www.apache.org/dyn/closer.cgi?path=/incubator/druid/{{ site.druid_versions[0].versions[0].version }}/apache-druid-{{ site.druid_versions[0].versions[0].version }}-bin.tar.gz" target="_blank"><span class="fas fa-feather"></span></a> · <a title="GitHub" href="https://github.com/apache/druid" target="_blank"><span class="fab fa-github"></span></a></div><div class="text-center license">Copyright © 2019 <a href="https://www.apache.org/" target="_blank">Apache Software Foundation</a>.<br/>Except where otherwise noted, licensed under <a rel="license" href="http://creativecommons.org/licenses/by-sa/4.0/">CC BY-SA 4.0</a>.<br/>Apache Druid, Druid, and the Druid logo are either registered trademarks or trademarks of The Apache Software Foundation in the United States and other countries.</div></div></footer></div><script type="text/javascript" src="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.js"></script><script>
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+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
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+<blockquote>
+<p>Lookups are an <a href="/docs/0.20.0/development/experimental.html">experimental</a> feature.</p>
+</blockquote>
+<p>To use this Apache Druid extension, make sure to <a href="/docs/0.20.0/development/extensions.html#loading-extensions">include</a> <code>druid-lookups-cached-global</code> and <code>druid-kafka-extraction-namespace</code> as an extension.</p>
+<p>If you need updates to populate as promptly as possible, it is possible to plug into a Kafka topic whose key is the old value and message is the desired new value (both in UTF-8) as a LookupExtractorFactory.</p>
+<pre><code class="hljs css language-json">{
+  <span class="hljs-attr">"type"</span>:<span class="hljs-string">"kafka"</span>,
+  <span class="hljs-attr">"kafkaTopic"</span>:<span class="hljs-string">"testTopic"</span>,
+  <span class="hljs-attr">"kafkaProperties"</span>:{<span class="hljs-attr">"zookeeper.connect"</span>:<span class="hljs-string">"somehost:2181/kafka"</span>}
+}
+</code></pre>
+<table>
+<thead>
+<tr><th>Parameter</th><th>Description</th><th>Required</th><th>Default</th></tr>
+</thead>
+<tbody>
+<tr><td><code>kafkaTopic</code></td><td>The Kafka topic to read the data from</td><td>Yes</td><td></td></tr>
+<tr><td><code>kafkaProperties</code></td><td>Kafka consumer properties. At least&quot;zookeeper.connect&quot; must be specified. Only the zookeeper connector is supported</td><td>Yes</td><td></td></tr>
+<tr><td><code>connectTimeout</code></td><td>How long to wait for an initial connection</td><td>No</td><td><code>0</code> (do not wait)</td></tr>
+<tr><td><code>isOneToOne</code></td><td>The map is a one-to-one (see <a href="/docs/0.20.0/querying/dimensionspecs.html">Lookup DimensionSpecs</a>)</td><td>No</td><td><code>false</code></td></tr>
+</tbody>
+</table>
+<p>The extension <code>kafka-extraction-namespace</code> enables reading from a Kafka feed which has name/key pairs to allow renaming of dimension values. An example use case would be to rename an ID to a human readable format.</p>
+<p>The consumer properties <code>group.id</code> and <code>auto.offset.reset</code> CANNOT be set in <code>kafkaProperties</code> as they are set by the extension as <code>UUID.randomUUID().toString()</code> and <code>smallest</code> respectively.</p>
+<p>See <a href="/docs/0.20.0/querying/lookups.html">lookups</a> for how to configure and use lookups.</p>
+<h2><a class="anchor" aria-hidden="true" id="limitations"></a><a href="#limitations" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Limitations</h2>
+<p>Currently the Kafka lookup extractor feeds the entire Kafka stream into a local cache. If you are using on-heap caching, this can easily clobber your java heap if the Kafka stream spews a lot of unique keys.
+off-heap caching should alleviate these concerns, but there is still a limit to the quantity of data that can be stored.
+There is currently no eviction policy.</p>
+<h2><a class="anchor" aria-hidden="true" id="testing-the-kafka-rename-functionality"></a><a href="#testing-the-kafka-rename-functionality" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Testing the Kafka rename functionality</h2>
+<p>To test this setup, you can send key/value pairs to a Kafka stream via the following producer console:</p>
+<pre><code class="hljs">./bin/kafka-console-producer.sh --<span class="hljs-keyword">property</span><span class="hljs-title"> </span>parse.<span class="hljs-attr">key=</span><span class="hljs-literal">true</span> --<span class="hljs-keyword">property</span><span class="hljs-title"> </span>key.<span class="hljs-attr">separator=</span><span class="hljs-string">"-&gt;"</span> --broker-list localhost:<span class="hljs-number">9092</span> --topic testTopic
+</code></pre>
+<p>Renames can then be published as <code>OLD_VAL-&gt;NEW_VAL</code> followed by newline (enter or return)</p>
+</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/0.20.0/development/extensions-core/hdfs.html"><span class="arrow-prev">← </span><span>HDFS</span></a><a class="docs-next button" href="/docs/0.20.0/development/extensions-core/lookups-cached-global.html"><span>Globally Cached Lookups</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#limitations">Limitations</a></li><li><a href="#testing-the-kafka-rename-functionality">Testing the Kafka rename functionality</a></li></ul></nav></div><footer class="nav-footer druid-footer" id="footer"><div class="container"><div class="text-center"><p><a href="/technology">Technology</a> · <a href="/use-cases">Use Cases</a> · <a href="/druid-powered">Powered by Druid</a> · <a href="/docs/0.20.0/latest">Docs</a> · <a href="/community/">Community</a> · <a href="/downloads.html">Download</a> · <a href="/faq">FAQ</a></p></div><div class="text-center"><a title="Join the user group" href="https://groups.google.com/forum/#!forum/druid-user" target="_blank"><span class="fa fa-comments"></span></a> · <a title="Follow Druid" href="https://twitter.com/druidio" target="_blank"><span class="fab fa-twitter"></span></a> · <a title="Download via Apache" href="https://www.apache.org/dyn/closer.cgi?path=/incubator/druid/{{ site.druid_versions[0].versions[0].version }}/apache-druid-{{ site.druid_versions[0].versions[0].version }}-bin.tar.gz" target="_blank"><span class="fas fa-feather"></span></a> · <a title="GitHub" href="https://github.com/apache/druid" target="_blank"><span class="fab fa-github"></span></a></div><div class="text-center license">Copyright © 2019 <a href="https://www.apache.org/" target="_blank">Apache Software Foundation</a>.<br/>Except where otherwise noted, licensed under <a rel="license" href="http://creativecommons.org/licenses/by-sa/4.0/">CC BY-SA 4.0</a>.<br/>Apache Druid, Druid, and the Druid logo are either registered trademarks or trademarks of The Apache Software Foundation in the United States and other countries.</div></div></footer></div><script type="text/javascript" src="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.js"></script><script>
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+<p>The Kafka indexing service enables the configuration of <em>supervisors</em> on the Overlord, which facilitate ingestion from
+Kafka by managing the creation and lifetime of Kafka indexing tasks. These indexing tasks read events using Kafka's own
+partition and offset mechanism and are therefore able to provide guarantees of exactly-once ingestion.
+The supervisor oversees the state of the indexing tasks to coordinate handoffs,
+manage failures, and ensure that the scalability and replication requirements are maintained.</p>
+<p>This service is provided in the <code>druid-kafka-indexing-service</code> core Apache Druid extension (see
+<a href="/docs/0.20.0/development/extensions.html#loading-extensions">Including Extensions</a>).</p>
+<blockquote>
+<p>The Kafka indexing service supports transactional topics which were introduced in Kafka 0.11.x. These changes make the
+Kafka consumer that Druid uses incompatible with older brokers. Ensure that your Kafka brokers are version 0.11.x or
+better before using this functionality. Refer <a href="https://kafka.apache.org/documentation/#upgrade">Kafka upgrade guide</a>
+if you are using older version of Kafka brokers.</p>
+</blockquote>
+<h2><a class="anchor" aria-hidden="true" id="tutorial"></a><a href="#tutorial" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Tutorial</h2>
+<p>This page contains reference documentation for Apache Kafka-based ingestion.
+For a walk-through instead, check out the <a href="/docs/0.20.0/tutorials/tutorial-kafka.html">Loading from Apache Kafka</a> tutorial.</p>
+<h2><a class="anchor" aria-hidden="true" id="submitting-a-supervisor-spec"></a><a href="#submitting-a-supervisor-spec" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Submitting a Supervisor Spec</h2>
+<p>The Kafka indexing service requires that the <code>druid-kafka-indexing-service</code> extension be loaded on both the Overlord and the
+MiddleManagers. A supervisor for a dataSource is started by submitting a supervisor spec via HTTP POST to
+<code>http://&lt;OVERLORD_IP&gt;:&lt;OVERLORD_PORT&gt;/druid/indexer/v1/supervisor</code>, for example:</p>
+<pre><code class="hljs">curl -X POST -H <span class="hljs-string">'Content-Type: application/json'</span> -d @supervisor-spec.json http:<span class="hljs-regexp">//</span>localhost:<span class="hljs-number">8090</span><span class="hljs-regexp">/druid/i</span>ndexer<span class="hljs-regexp">/v1/</span>supervisor
+</code></pre>
+<p>A sample supervisor spec is shown below:</p>
+<pre><code class="hljs css language-json">{
+  <span class="hljs-attr">"type"</span>: <span class="hljs-string">"kafka"</span>,
+  <span class="hljs-attr">"dataSchema"</span>: {
+    <span class="hljs-attr">"dataSource"</span>: <span class="hljs-string">"metrics-kafka"</span>,
+    <span class="hljs-attr">"timestampSpec"</span>: {
+      <span class="hljs-attr">"column"</span>: <span class="hljs-string">"timestamp"</span>,
+      <span class="hljs-attr">"format"</span>: <span class="hljs-string">"auto"</span>
+    },
+    <span class="hljs-attr">"dimensionsSpec"</span>: {
+      <span class="hljs-attr">"dimensions"</span>: [],
+      <span class="hljs-attr">"dimensionExclusions"</span>: [
+        <span class="hljs-string">"timestamp"</span>,
+        <span class="hljs-string">"value"</span>
+      ]
+    },
+    <span class="hljs-attr">"metricsSpec"</span>: [
+      {
+        <span class="hljs-attr">"name"</span>: <span class="hljs-string">"count"</span>,
+        <span class="hljs-attr">"type"</span>: <span class="hljs-string">"count"</span>
+      },
+      {
+        <span class="hljs-attr">"name"</span>: <span class="hljs-string">"value_sum"</span>,
+        <span class="hljs-attr">"fieldName"</span>: <span class="hljs-string">"value"</span>,
+        <span class="hljs-attr">"type"</span>: <span class="hljs-string">"doubleSum"</span>
+      },
+      {
+        <span class="hljs-attr">"name"</span>: <span class="hljs-string">"value_min"</span>,
+        <span class="hljs-attr">"fieldName"</span>: <span class="hljs-string">"value"</span>,
+        <span class="hljs-attr">"type"</span>: <span class="hljs-string">"doubleMin"</span>
+      },
+      {
+        <span class="hljs-attr">"name"</span>: <span class="hljs-string">"value_max"</span>,
+        <span class="hljs-attr">"fieldName"</span>: <span class="hljs-string">"value"</span>,
+        <span class="hljs-attr">"type"</span>: <span class="hljs-string">"doubleMax"</span>
+      }
+    ],
+    <span class="hljs-attr">"granularitySpec"</span>: {
+      <span class="hljs-attr">"type"</span>: <span class="hljs-string">"uniform"</span>,
+      <span class="hljs-attr">"segmentGranularity"</span>: <span class="hljs-string">"HOUR"</span>,
+      <span class="hljs-attr">"queryGranularity"</span>: <span class="hljs-string">"NONE"</span>
+    }
+  },
+  <span class="hljs-attr">"ioConfig"</span>: {
+    <span class="hljs-attr">"topic"</span>: <span class="hljs-string">"metrics"</span>,
+    <span class="hljs-attr">"inputFormat"</span>: {
+      <span class="hljs-attr">"type"</span>: <span class="hljs-string">"json"</span>
+    },
+    <span class="hljs-attr">"consumerProperties"</span>: {
+      <span class="hljs-attr">"bootstrap.servers"</span>: <span class="hljs-string">"localhost:9092"</span>
+    },
+    <span class="hljs-attr">"taskCount"</span>: <span class="hljs-number">1</span>,
+    <span class="hljs-attr">"replicas"</span>: <span class="hljs-number">1</span>,
+    <span class="hljs-attr">"taskDuration"</span>: <span class="hljs-string">"PT1H"</span>
+  },
+  <span class="hljs-attr">"tuningConfig"</span>: {
+    <span class="hljs-attr">"type"</span>: <span class="hljs-string">"kafka"</span>,
+    <span class="hljs-attr">"maxRowsPerSegment"</span>: <span class="hljs-number">5000000</span>
+  }
+}
+</code></pre>
+<h2><a class="anchor" aria-hidden="true" id="supervisor-configuration"></a><a href="#supervisor-configuration" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Supervisor Configuration</h2>
+<table>
+<thead>
+<tr><th>Field</th><th>Description</th><th>Required</th></tr>
+</thead>
+<tbody>
+<tr><td><code>type</code></td><td>The supervisor type, this should always be <code>kafka</code>.</td><td>yes</td></tr>
+<tr><td><code>dataSchema</code></td><td>The schema that will be used by the Kafka indexing task during ingestion. See <a href="/docs/0.20.0/ingestion/index.html#dataschema"><code>dataSchema</code></a> for details.</td><td>yes</td></tr>
+<tr><td><code>ioConfig</code></td><td>A KafkaSupervisorIOConfig object for configuring Kafka connection and I/O-related settings for the supervisor and indexing task. See <a href="#kafkasupervisorioconfig">KafkaSupervisorIOConfig</a> below.</td><td>yes</td></tr>
+<tr><td><code>tuningConfig</code></td><td>A KafkaSupervisorTuningConfig object for configuring performance-related settings for the supervisor and indexing tasks. See <a href="#kafkasupervisortuningconfig">KafkaSupervisorTuningConfig</a> below.</td><td>no</td></tr>
+</tbody>
+</table>
+<h3><a class="anchor" aria-hidden="true" id="kafkasupervisorioconfig"></a><a href="#kafkasupervisorioconfig" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>KafkaSupervisorIOConfig</h3>
+<table>
+<thead>
+<tr><th>Field</th><th>Type</th><th>Description</th><th>Required</th></tr>
+</thead>
+<tbody>
+<tr><td><code>topic</code></td><td>String</td><td>The Kafka topic to read from. This must be a specific topic as topic patterns are not supported.</td><td>yes</td></tr>
+<tr><td><code>inputFormat</code></td><td>Object</td><td><a href="/docs/0.20.0/ingestion/data-formats.html#input-format"><code>inputFormat</code></a> to specify how to parse input data. See <a href="#specifying-data-format">the below section</a> for details about specifying the input format.</td><td>yes</td></tr>
+<tr><td><code>consumerProperties</code></td><td>Map&lt;String, Object&gt;</td><td>A map of properties to be passed to the Kafka consumer. This must contain a property <code>bootstrap.servers</code> with a list of Kafka brokers in the form: <code>&lt;BROKER_1&gt;:&lt;PORT_1&gt;,&lt;BROKER_2&gt;:&lt;PORT_2&gt;,...</code>. For SSL connections, the <code>keystore</code>, <code>truststore</code> and <code>key</code> passwords can be provided as a <a href="/docs/0.20.0/operations/password-provider.html">Password Provider</a> or String password.</td><td>yes</td></tr>
+<tr><td><code>pollTimeout</code></td><td>Long</td><td>The length of time to wait for the Kafka consumer to poll records, in milliseconds</td><td>no (default == 100)</td></tr>
+<tr><td><code>replicas</code></td><td>Integer</td><td>The number of replica sets, where 1 means a single set of tasks (no replication). Replica tasks will always be assigned to different workers to provide resiliency against process failure.</td><td>no (default == 1)</td></tr>
+<tr><td><code>taskCount</code></td><td>Integer</td><td>The maximum number of <em>reading</em> tasks in a <em>replica set</em>. This means that the maximum number of reading tasks will be <code>taskCount * replicas</code> and the total number of tasks (<em>reading</em> + <em>publishing</em>) will be higher than this. See <a href="#capacity-planning">Capacity Planning</a> below for more details. The number of reading tasks will be less than <code>taskCount</code> if <code>taskCount &gt; {numKafkaPartitions}</code>.</td><td>no (default == 1)</td></tr>
+<tr><td><code>taskDuration</code></td><td>ISO8601 Period</td><td>The length of time before tasks stop reading and begin publishing their segment.</td><td>no (default == PT1H)</td></tr>
+<tr><td><code>startDelay</code></td><td>ISO8601 Period</td><td>The period to wait before the supervisor starts managing tasks.</td><td>no (default == PT5S)</td></tr>
+<tr><td><code>period</code></td><td>ISO8601 Period</td><td>How often the supervisor will execute its management logic. Note that the supervisor will also run in response to certain events (such as tasks succeeding, failing, and reaching their taskDuration) so this value specifies the maximum time between iterations.</td><td>no (default == PT30S)</td></tr>
+<tr><td><code>useEarliestOffset</code></td><td>Boolean</td><td>If a supervisor is managing a dataSource for the first time, it will obtain a set of starting offsets from Kafka. This flag determines whether it retrieves the earliest or latest offsets in Kafka. Under normal circumstances, subsequent tasks will start from where the previous segments ended so this flag will only be used on first run.</td><td>no (default == false)</td></tr>
+<tr><td><code>completionTimeout</code></td><td>ISO8601 Period</td><td>The length of time to wait before declaring a publishing task as failed and terminating it. If this is set too low, your tasks may never publish. The publishing clock for a task begins roughly after <code>taskDuration</code> elapses.</td><td>no (default == PT30M)</td></tr>
+<tr><td><code>lateMessageRejectionStartDateTime</code></td><td>ISO8601 DateTime</td><td>Configure tasks to reject messages with timestamps earlier than this date time; for example if this is set to <code>2016-01-01T11:00Z</code> and the supervisor creates a task at <em>2016-01-01T12:00Z</em>, messages with timestamps earlier than <em>2016-01-01T11:00Z</em> will be dropped. This may help prevent concurrency issues if your data stream has late messages and you have multiple pipelines that need to operate on the same segments (e.g. a realtime and a nightly batch ingestion pipeline).</td><td>no (default == none)</td></tr>
+<tr><td><code>lateMessageRejectionPeriod</code></td><td>ISO8601 Period</td><td>Configure tasks to reject messages with timestamps earlier than this period before the task was created; for example if this is set to <code>PT1H</code> and the supervisor creates a task at <em>2016-01-01T12:00Z</em>, messages with timestamps earlier than <em>2016-01-01T11:00Z</em> will be dropped. This may help prevent concurrency issues if your data stream has late messages and you have multiple pipelines that need to operate on the same segments (e.g. a realtime and a nightly batch ingestion pipeline). Please note that only one of <code>lateMessageRejectionPeriod</code> or <code>lateMessageRejectionStartDateTime</code> can be specified.</td><td>no (default == none)</td></tr>
+<tr><td><code>earlyMessageRejectionPeriod</code></td><td>ISO8601 Period</td><td>Configure tasks to reject messages with timestamps later than this period after the task reached its taskDuration; for example if this is set to <code>PT1H</code>, the taskDuration is set to <code>PT1H</code> and the supervisor creates a task at <em>2016-01-01T12:00Z</em>, messages with timestamps later than <em>2016-01-01T14:00Z</em> will be dropped. <strong>Note:</strong> Tasks sometimes run past their task duration, for example, in cases of supervisor failover. Setting earlyMessageRejectionPeriod too low may cause messages to be dropped unexpectedly whenever a task runs past its originally configured task duration.</td><td>no (default == none)</td></tr>
+</tbody>
+</table>
+<h4><a class="anchor" aria-hidden="true" id="specifying-data-format"></a><a href="#specifying-data-format" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Specifying data format</h4>
+<p>Kafka indexing service supports both <a href="/docs/0.20.0/ingestion/data-formats.html#input-format"><code>inputFormat</code></a> and <a href="/docs/0.20.0/ingestion/data-formats.html#parser"><code>parser</code></a> to specify the data format.
+The <code>inputFormat</code> is a new and recommended way to specify the data format for Kafka indexing service,
+but unfortunately, it doesn't support all data formats supported by the legacy <code>parser</code>.
+(They will be supported in the future.)</p>
+<p>The supported <code>inputFormat</code>s include <a href="/docs/0.20.0/ingestion/data-formats.html#csv"><code>csv</code></a>,
+<a href="/docs/0.20.0/ingestion/data-formats.html#tsv-delimited"><code>delimited</code></a>, and <a href="/docs/0.20.0/ingestion/data-formats.html#json"><code>json</code></a>.
+You can also read <a href="/docs/0.20.0/ingestion/data-formats.html#avro-stream-parser"><code>avro_stream</code></a>,
+<a href="/docs/0.20.0/ingestion/data-formats.html#protobuf-parser"><code>protobuf</code></a>,
+and <a href="/docs/0.20.0/development/extensions-contrib/thrift.html"><code>thrift</code></a> formats using <code>parser</code>.</p>
+<p><a name="tuningconfig"></a></p>
+<h3><a class="anchor" aria-hidden="true" id="kafkasupervisortuningconfig"></a><a href="#kafkasupervisortuningconfig" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>KafkaSupervisorTuningConfig</h3>
+<p>The tuningConfig is optional and default parameters will be used if no tuningConfig is specified.</p>
+<table>
+<thead>
+<tr><th>Field</th><th>Type</th><th>Description</th><th>Required</th></tr>
+</thead>
+<tbody>
+<tr><td><code>type</code></td><td>String</td><td>The indexing task type, this should always be <code>kafka</code>.</td><td>yes</td></tr>
+<tr><td><code>maxRowsInMemory</code></td><td>Integer</td><td>The number of rows to aggregate before persisting. This number is the post-aggregation rows, so it is not equivalent to the number of input events, but the number of aggregated rows that those events result in. This is used to manage the required JVM heap size. Maximum heap memory usage for indexing scales with maxRowsInMemory * (2 + maxPendingPersists). Normally user does not need to set this, but depending on the nature of data, if rows are short in terms of bytes, user may not want to store a million rows in memory and this value should be set.</td><td>no (default == 1000000)</td></tr>
+<tr><td><code>maxBytesInMemory</code></td><td>Long</td><td>The number of bytes to aggregate in heap memory before persisting. This is based on a rough estimate of memory usage and not actual usage. Normally this is computed internally and user does not need to set it. The maximum heap memory usage for indexing is maxBytesInMemory * (2 + maxPendingPersists).</td><td>no (default == One-sixth of max JVM memory)</td></tr>
+<tr><td><code>maxRowsPerSegment</code></td><td>Integer</td><td>The number of rows to aggregate into a segment; this number is post-aggregation rows. Handoff will happen either if <code>maxRowsPerSegment</code> or <code>maxTotalRows</code> is hit or every <code>intermediateHandoffPeriod</code>, whichever happens earlier.</td><td>no (default == 5000000)</td></tr>
+<tr><td><code>maxTotalRows</code></td><td>Long</td><td>The number of rows to aggregate across all segments; this number is post-aggregation rows. Handoff will happen either if <code>maxRowsPerSegment</code> or <code>maxTotalRows</code> is hit or every <code>intermediateHandoffPeriod</code>, whichever happens earlier.</td><td>no (default == unlimited)</td></tr>
+<tr><td><code>intermediatePersistPeriod</code></td><td>ISO8601 Period</td><td>The period that determines the rate at which intermediate persists occur.</td><td>no (default == PT10M)</td></tr>
+<tr><td><code>maxPendingPersists</code></td><td>Integer</td><td>Maximum number of persists that can be pending but not started. If this limit would be exceeded by a new intermediate persist, ingestion will block until the currently-running persist finishes. Maximum heap memory usage for indexing scales with maxRowsInMemory * (2 + maxPendingPersists).</td><td>no (default == 0, meaning one persist can be running concurrently with ingestion, and none can be queued up)</td></tr>
+<tr><td><code>indexSpec</code></td><td>Object</td><td>Tune how data is indexed. See <a href="#indexspec">IndexSpec</a> for more information.</td><td>no</td></tr>
+<tr><td><code>indexSpecForIntermediatePersists</code></td><td></td><td>Defines segment storage format options to be used at indexing time for intermediate persisted temporary segments. This can be used to disable dimension/metric compression on intermediate segments to reduce memory required for final merging. However, disabling compression on intermediate segments might increase page cache use while they are used before getting merged into final segment published, see <a href="#indexspec">IndexSpec</a> for possible values.</td><td>no (default = same as indexSpec)</td></tr>
+<tr><td><code>reportParseExceptions</code></td><td>Boolean</td><td><em>DEPRECATED</em>. If true, exceptions encountered during parsing will be thrown and will halt ingestion; if false, unparseable rows and fields will be skipped. Setting <code>reportParseExceptions</code> to true will override existing configurations for <code>maxParseExceptions</code> and <code>maxSavedParseExceptions</code>, setting <code>maxParseExceptions</code> to 0 and limiting <code>maxSavedParseExceptions</code> to no more than 1.</td><td>no (default == false)</td></tr>
+<tr><td><code>handoffConditionTimeout</code></td><td>Long</td><td>Milliseconds to wait for segment handoff. It must be &gt;= 0, where 0 means to wait forever.</td><td>no (default == 0)</td></tr>
+<tr><td><code>resetOffsetAutomatically</code></td><td>Boolean</td><td>Controls behavior when Druid needs to read Kafka messages that are no longer available (i.e. when OffsetOutOfRangeException is encountered).<br/><br/>If false, the exception will bubble up, which will cause your tasks to fail and ingestion to halt. If this occurs, manual intervention is required to correct the situation; potentially using the <a href="../../operations/api-reference.html#supervisors">Reset Supervisor API</a>. This mode is useful for production, since it will make you aware of issues with ingestion.<br/><br/>If true, Druid will automatically reset to the earlier or latest offset available in Kafka, based on the value of the <code>useEarliestOffset</code> property (earliest if true, latest if false). Please note that this can lead to data being <em>DROPPED</em> (if <code>useEarliestOffset</code> is false) or <em>DUPLICATED</em> (if <code>useEarliestOffset</code> is true) without your knowledge. Messages will be logged indicating that a reset has occurred, but ingestion will continue. This mode is useful for non-production situations, since it will make Druid attempt to recover from problems automatically, even if they lead to quiet dropping or duplicating of data.<br/><br/>This feature behaves similarly to the Kafka <code>auto.offset.reset</code> consumer property.</td><td>no (default == false)</td></tr>
+<tr><td><code>workerThreads</code></td><td>Integer</td><td>The number of threads that the supervisor uses to handle requests/responses for worker tasks, along with any other internal asynchronous operation.</td><td>no (default == min(10, taskCount))</td></tr>
+<tr><td><code>chatThreads</code></td><td>Integer</td><td>The number of threads that will be used for communicating with indexing tasks.</td><td>no (default == min(10, taskCount * replicas))</td></tr>
+<tr><td><code>chatRetries</code></td><td>Integer</td><td>The number of times HTTP requests to indexing tasks will be retried before considering tasks unresponsive.</td><td>no (default == 8)</td></tr>
+<tr><td><code>httpTimeout</code></td><td>ISO8601 Period</td><td>How long to wait for a HTTP response from an indexing task.</td><td>no (default == PT10S)</td></tr>
+<tr><td><code>shutdownTimeout</code></td><td>ISO8601 Period</td><td>How long to wait for the supervisor to attempt a graceful shutdown of tasks before exiting.</td><td>no (default == PT80S)</td></tr>
+<tr><td><code>offsetFetchPeriod</code></td><td>ISO8601 Period</td><td>How often the supervisor queries Kafka and the indexing tasks to fetch current offsets and calculate lag.</td><td>no (default == PT30S, min == PT5S)</td></tr>
+<tr><td><code>segmentWriteOutMediumFactory</code></td><td>Object</td><td>Segment write-out medium to use when creating segments. See below for more information.</td><td>no (not specified by default, the value from <code>druid.peon.defaultSegmentWriteOutMediumFactory.type</code> is used)</td></tr>
+<tr><td><code>intermediateHandoffPeriod</code></td><td>ISO8601 Period</td><td>How often the tasks should hand off segments. Handoff will happen either if <code>maxRowsPerSegment</code> or <code>maxTotalRows</code> is hit or every <code>intermediateHandoffPeriod</code>, whichever happens earlier.</td><td>no (default == P2147483647D)</td></tr>
+<tr><td><code>logParseExceptions</code></td><td>Boolean</td><td>If true, log an error message when a parsing exception occurs, containing information about the row where the error occurred.</td><td>no, default == false</td></tr>
+<tr><td><code>maxParseExceptions</code></td><td>Integer</td><td>The maximum number of parse exceptions that can occur before the task halts ingestion and fails. Overridden if <code>reportParseExceptions</code> is set.</td><td>no, unlimited default</td></tr>
+<tr><td><code>maxSavedParseExceptions</code></td><td>Integer</td><td>When a parse exception occurs, Druid can keep track of the most recent parse exceptions. &quot;maxSavedParseExceptions&quot; limits how many exception instances will be saved. These saved exceptions will be made available after the task finishes in the <a href="/docs/0.20.0/ingestion/tasks.html#reports">task completion report</a>. Overridden if <code>reportParseExceptions</code> is set.</td><td>no, default == 0</td></tr>
+</tbody>
+</table>
+<h4><a class="anchor" aria-hidden="true" id="indexspec"></a><a href="#indexspec" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>IndexSpec</h4>
+<table>
+<thead>
+<tr><th>Field</th><th>Type</th><th>Description</th><th>Required</th></tr>
+</thead>
+<tbody>
+<tr><td>bitmap</td><td>Object</td><td>Compression format for bitmap indexes. Should be a JSON object. See <a href="#bitmap-types">Bitmap types</a> below for options.</td><td>no (defaults to Roaring)</td></tr>
+<tr><td>dimensionCompression</td><td>String</td><td>Compression format for dimension columns. Choose from <code>LZ4</code>, <code>LZF</code>, or <code>uncompressed</code>.</td><td>no (default == <code>LZ4</code>)</td></tr>
+<tr><td>metricCompression</td><td>String</td><td>Compression format for primitive type metric columns. Choose from <code>LZ4</code>, <code>LZF</code>, <code>uncompressed</code>, or <code>none</code>.</td><td>no (default == <code>LZ4</code>)</td></tr>
+<tr><td>longEncoding</td><td>String</td><td>Encoding format for metric and dimension columns with type long. Choose from <code>auto</code> or <code>longs</code>. <code>auto</code> encodes the values using offset or lookup table depending on column cardinality, and store them with variable size. <code>longs</code> stores the value as is with 8 bytes each.</td><td>no (default == <code>longs</code>)</td></tr>
+</tbody>
+</table>
+<h5><a class="anchor" aria-hidden="true" id="bitmap-types"></a><a href="#bitmap-types" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Bitmap types</h5>
+<p>For Roaring bitmaps:</p>
+<table>
+<thead>
+<tr><th>Field</th><th>Type</th><th>Description</th><th>Required</th></tr>
+</thead>
+<tbody>
+<tr><td><code>type</code></td><td>String</td><td>Must be <code>roaring</code>.</td><td>yes</td></tr>
+<tr><td><code>compressRunOnSerialization</code></td><td>Boolean</td><td>Use a run-length encoding where it is estimated as more space efficient.</td><td>no (default == <code>true</code>)</td></tr>
+</tbody>
+</table>
+<p>For Concise bitmaps:</p>
+<table>
+<thead>
+<tr><th>Field</th><th>Type</th><th>Description</th><th>Required</th></tr>
+</thead>
+<tbody>
+<tr><td><code>type</code></td><td>String</td><td>Must be <code>concise</code>.</td><td>yes</td></tr>
+</tbody>
+</table>
+<h4><a class="anchor" aria-hidden="true" id="segmentwriteoutmediumfactory"></a><a href="#segmentwriteoutmediumfactory" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>SegmentWriteOutMediumFactory</h4>
+<table>
+<thead>
+<tr><th>Field</th><th>Type</th><th>Description</th><th>Required</th></tr>
+</thead>
+<tbody>
+<tr><td><code>type</code></td><td>String</td><td>See <a href="../../configuration/index.html#segmentwriteoutmediumfactory">Additional Peon Configuration: SegmentWriteOutMediumFactory</a> for explanation and available options.</td><td>yes</td></tr>
+</tbody>
+</table>
+<h2><a class="anchor" aria-hidden="true" id="operations"></a><a href="#operations" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Operations</h2>
+<p>This section gives descriptions of how some supervisor APIs work specifically in Kafka Indexing Service.
+For all supervisor APIs, please check <a href="../../operations/api-reference.html#supervisors">Supervisor APIs</a>.</p>
+<h3><a class="anchor" aria-hidden="true" id="getting-supervisor-status-report"></a><a href="#getting-supervisor-status-report" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Getting Supervisor Status Report</h3>
+<p><code>GET /druid/indexer/v1/supervisor/&lt;supervisorId&gt;/status</code> returns a snapshot report of the current state of the tasks managed by the given supervisor. This includes the latest
+offsets as reported by Kafka, the consumer lag per partition, as well as the aggregate lag of all partitions. The
+consumer lag per partition may be reported as negative values if the supervisor has not received a recent latest offset
+response from Kafka. The aggregate lag value will always be &gt;= 0.</p>
+<p>The status report also contains the supervisor's state and a list of recently thrown exceptions (reported as
+<code>recentErrors</code>, whose max size can be controlled using the <code>druid.supervisor.maxStoredExceptionEvents</code> configuration).
+There are two fields related to the supervisor's state - <code>state</code> and <code>detailedState</code>. The <code>state</code> field will always be
+one of a small number of generic states that are applicable to any type of supervisor, while the <code>detailedState</code> field
+will contain a more descriptive, implementation-specific state that may provide more insight into the supervisor's
+activities than the generic <code>state</code> field.</p>
+<p>The list of possible <code>state</code> values are: [<code>PENDING</code>, <code>RUNNING</code>, <code>SUSPENDED</code>, <code>STOPPING</code>, <code>UNHEALTHY_SUPERVISOR</code>, <code>UNHEALTHY_TASKS</code>]</p>
+<p>The list of <code>detailedState</code> values and their corresponding <code>state</code> mapping is as follows:</p>
+<table>
+<thead>
+<tr><th>Detailed State</th><th>Corresponding State</th><th>Description</th></tr>
+</thead>
+<tbody>
+<tr><td>UNHEALTHY_SUPERVISOR</td><td>UNHEALTHY_SUPERVISOR</td><td>The supervisor has encountered errors on the past <code>druid.supervisor.unhealthinessThreshold</code> iterations</td></tr>
+<tr><td>UNHEALTHY_TASKS</td><td>UNHEALTHY_TASKS</td><td>The last <code>druid.supervisor.taskUnhealthinessThreshold</code> tasks have all failed</td></tr>
+<tr><td>UNABLE_TO_CONNECT_TO_STREAM</td><td>UNHEALTHY_SUPERVISOR</td><td>The supervisor is encountering connectivity issues with Kafka and has not successfully connected in the past</td></tr>
+<tr><td>LOST_CONTACT_WITH_STREAM</td><td>UNHEALTHY_SUPERVISOR</td><td>The supervisor is encountering connectivity issues with Kafka but has successfully connected in the past</td></tr>
+<tr><td>PENDING (first iteration only)</td><td>PENDING</td><td>The supervisor has been initialized and hasn't started connecting to the stream</td></tr>
+<tr><td>CONNECTING_TO_STREAM (first iteration only)</td><td>RUNNING</td><td>The supervisor is trying to connect to the stream and update partition data</td></tr>
+<tr><td>DISCOVERING_INITIAL_TASKS (first iteration only)</td><td>RUNNING</td><td>The supervisor is discovering already-running tasks</td></tr>
+<tr><td>CREATING_TASKS (first iteration only)</td><td>RUNNING</td><td>The supervisor is creating tasks and discovering state</td></tr>
+<tr><td>RUNNING</td><td>RUNNING</td><td>The supervisor has started tasks and is waiting for taskDuration to elapse</td></tr>
+<tr><td>SUSPENDED</td><td>SUSPENDED</td><td>The supervisor has been suspended</td></tr>
+<tr><td>STOPPING</td><td>STOPPING</td><td>The supervisor is stopping</td></tr>
+</tbody>
+</table>
+<p>On each iteration of the supervisor's run loop, the supervisor completes the following tasks in sequence:</p>
+<ol>
+<li>Fetch the list of partitions from Kafka and determine the starting offset for each partition (either based on the
+last processed offset if continuing, or starting from the beginning or ending of the stream if this is a new topic).</li>
+<li>Discover any running indexing tasks that are writing to the supervisor's datasource and adopt them if they match
+the supervisor's configuration, else signal them to stop.</li>
+<li>Send a status request to each supervised task to update our view of the state of the tasks under our supervision.</li>
+<li>Handle tasks that have exceeded <code>taskDuration</code> and should transition from the reading to publishing state.</li>
+<li>Handle tasks that have finished publishing and signal redundant replica tasks to stop.</li>
+<li>Handle tasks that have failed and clean up the supervisor's internal state.</li>
+<li>Compare the list of healthy tasks to the requested <code>taskCount</code> and <code>replicas</code> configurations and create additional tasks if required.</li>
+</ol>
+<p>The <code>detailedState</code> field will show additional values (those marked with &quot;first iteration only&quot;) the first time the
+supervisor executes this run loop after startup or after resuming from a suspension. This is intended to surface
+initialization-type issues, where the supervisor is unable to reach a stable state (perhaps because it can't connect to
+Kafka, it can't read from the Kafka topic, or it can't communicate with existing tasks). Once the supervisor is stable -
+that is, once it has completed a full execution without encountering any issues - <code>detailedState</code> will show a <code>RUNNING</code>
+state until it is stopped, suspended, or hits a failure threshold and transitions to an unhealthy state.</p>
+<h3><a class="anchor" aria-hidden="true" id="getting-supervisor-ingestion-stats-report"></a><a href="#getting-supervisor-ingestion-stats-report" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Getting Supervisor Ingestion Stats Report</h3>
+<p><code>GET /druid/indexer/v1/supervisor/&lt;supervisorId&gt;/stats</code> returns a snapshot of the current ingestion row counters for each task being managed by the supervisor, along with moving averages for the row counters.</p>
+<p>See <a href="/docs/0.20.0/ingestion/tasks.html#row-stats">Task Reports: Row Stats</a> for more information.</p>
+<h3><a class="anchor" aria-hidden="true" id="supervisor-health-check"></a><a href="#supervisor-health-check" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Supervisor Health Check</h3>
+<p><code>GET /druid/indexer/v1/supervisor/&lt;supervisorId&gt;/health</code> returns <code>200 OK</code> if the supervisor is healthy and
+<code>503 Service Unavailable</code> if it is unhealthy. Healthiness is determined by the supervisor's <code>state</code> (as returned by the
+<code>/status</code> endpoint) and the <code>druid.supervisor.*</code> Overlord configuration thresholds.</p>
+<h3><a class="anchor" aria-hidden="true" id="updating-existing-supervisors"></a><a href="#updating-existing-supervisors" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Updating Existing Supervisors</h3>
+<p><code>POST /druid/indexer/v1/supervisor</code> can be used to update existing supervisor spec.
+Calling this endpoint when there is already an existing supervisor for the same dataSource will cause:</p>
+<ul>
+<li>The running supervisor to signal its managed tasks to stop reading and begin publishing.</li>
+<li>The running supervisor to exit.</li>
+<li>A new supervisor to be created using the configuration provided in the request body. This supervisor will retain the
+existing publishing tasks and will create new tasks starting at the offsets the publishing tasks ended on.</li>
+</ul>
+<p>Seamless schema migrations can thus be achieved by simply submitting the new schema using this endpoint.</p>
+<h3><a class="anchor" aria-hidden="true" id="suspending-and-resuming-supervisors"></a><a href="#suspending-and-resuming-supervisors" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Suspending and Resuming Supervisors</h3>
+<p>You can suspend and resume a supervisor using <code>POST /druid/indexer/v1/supervisor/&lt;supervisorId&gt;/suspend</code> and <code>POST /druid/indexer/v1/supervisor/&lt;supervisorId&gt;/resume</code>, respectively.</p>
+<p>Note that the supervisor itself will still be operating and emitting logs and metrics,
+it will just ensure that no indexing tasks are running until the supervisor is resumed.</p>
+<h3><a class="anchor" aria-hidden="true" id="resetting-supervisors"></a><a href="#resetting-supervisors" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Resetting Supervisors</h3>
+<p>The <code>POST /druid/indexer/v1/supervisor/&lt;supervisorId&gt;/reset</code> operation clears stored
+offsets, causing the supervisor to start reading offsets from either the earliest or latest
+offsets in Kafka (depending on the value of <code>useEarliestOffset</code>). After clearing stored
+offsets, the supervisor kills and recreates any active tasks, so that tasks begin reading
+from valid offsets.</p>
+<p>Use care when using this operation! Resetting the supervisor may cause Kafka messages
+to be skipped or read twice, resulting in missing or duplicate data.</p>
+<p>The reason for using this operation is to recover from a state in which the supervisor
+ceases operating due to missing offsets. The indexing service keeps track of the latest
+persisted Kafka offsets in order to provide exactly-once ingestion guarantees across
+tasks. Subsequent tasks must start reading from where the previous task completed in
+order for the generated segments to be accepted. If the messages at the expected
+starting offsets are no longer available in Kafka (typically because the message retention
+period has elapsed or the topic was removed and re-created) the supervisor will refuse
+to start and in flight tasks will fail. This operation enables you to recover from this condition.</p>
+<p>Note that the supervisor must be running for this endpoint to be available.</p>
+<h3><a class="anchor" aria-hidden="true" id="terminating-supervisors"></a><a href="#terminating-supervisors" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Terminating Supervisors</h3>
+<p>The <code>POST /druid/indexer/v1/supervisor/&lt;supervisorId&gt;/terminate</code> operation terminates a supervisor and causes all
+associated indexing tasks managed by this supervisor to immediately stop and begin
+publishing their segments. This supervisor will still exist in the metadata store and it's history may be retrieved
+with the supervisor history API, but will not be listed in the 'get supervisors' API response nor can it's configuration
+or status report be retrieved. The only way this supervisor can start again is by submitting a functioning supervisor
+spec to the create API.</p>
+<h3><a class="anchor" aria-hidden="true" id="capacity-planning"></a><a href="#capacity-planning" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Capacity Planning</h3>
+<p>Kafka indexing tasks run on MiddleManagers and are thus limited by the resources available in the MiddleManager
+cluster. In particular, you should make sure that you have sufficient worker capacity (configured using the
+<code>druid.worker.capacity</code> property) to handle the configuration in the supervisor spec. Note that worker capacity is
+shared across all types of indexing tasks, so you should plan your worker capacity to handle your total indexing load
+(e.g. batch processing, realtime tasks, merging tasks, etc.). If your workers run out of capacity, Kafka indexing tasks
+will queue and wait for the next available worker. This may cause queries to return partial results but will not result
+in data loss (assuming the tasks run before Kafka purges those offsets).</p>
+<p>A running task will normally be in one of two states: <em>reading</em> or <em>publishing</em>. A task will remain in reading state for
+<code>taskDuration</code>, at which point it will transition to publishing state. A task will remain in publishing state for as long
+as it takes to generate segments, push segments to deep storage, and have them be loaded and served by a Historical process
+(or until <code>completionTimeout</code> elapses).</p>
+<p>The number of reading tasks is controlled by <code>replicas</code> and <code>taskCount</code>. In general, there will be <code>replicas * taskCount</code>
+reading tasks, the exception being if taskCount &gt; {numKafkaPartitions} in which case {numKafkaPartitions} tasks will
+be used instead. When <code>taskDuration</code> elapses, these tasks will transition to publishing state and <code>replicas * taskCount</code>
+new reading tasks will be created. Therefore to allow for reading tasks and publishing tasks to run concurrently, there
+should be a minimum capacity of:</p>
+<pre><code class="hljs"><span class="hljs-attr">workerCapacity</span> = <span class="hljs-number">2</span> * replicas * taskCount
+</code></pre>
+<p>This value is for the ideal situation in which there is at most one set of tasks publishing while another set is reading.
+In some circumstances, it is possible to have multiple sets of tasks publishing simultaneously. This would happen if the
+time-to-publish (generate segment, push to deep storage, loaded on Historical) &gt; <code>taskDuration</code>. This is a valid
+scenario (correctness-wise) but requires additional worker capacity to support. In general, it is a good idea to have
+<code>taskDuration</code> be large enough that the previous set of tasks finishes publishing before the current set begins.</p>
+<h3><a class="anchor" aria-hidden="true" id="supervisor-persistence"></a><a href="#supervisor-persistence" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Supervisor Persistence</h3>
+<p>When a supervisor spec is submitted via the <code>POST /druid/indexer/v1/supervisor</code> endpoint, it is persisted in the
+configured metadata database. There can only be a single supervisor per dataSource, and submitting a second spec for
+the same dataSource will overwrite the previous one.</p>
+<p>When an Overlord gains leadership, either by being started or as a result of another Overlord failing, it will spawn
+a supervisor for each supervisor spec in the metadata database. The supervisor will then discover running Kafka indexing
+tasks and will attempt to adopt them if they are compatible with the supervisor's configuration. If they are not
+compatible because they have a different ingestion spec or partition allocation, the tasks will be killed and the
+supervisor will create a new set of tasks. In this way, the supervisors are persistent across Overlord restarts and
+fail-overs.</p>
+<p>A supervisor is stopped via the <code>POST /druid/indexer/v1/supervisor/&lt;supervisorId&gt;/terminate</code> endpoint. This places a
+tombstone marker in the database (to prevent the supervisor from being reloaded on a restart) and then gracefully
+shuts down the currently running supervisor. When a supervisor is shut down in this way, it will instruct its
+managed tasks to stop reading and begin publishing their segments immediately. The call to the shutdown endpoint will
+return after all tasks have been signaled to stop but before the tasks finish publishing their segments.</p>
+<h3><a class="anchor" aria-hidden="true" id="schemaconfiguration-changes"></a><a href="#schemaconfiguration-changes" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Schema/Configuration Changes</h3>
+<p>Schema and configuration changes are handled by submitting the new supervisor spec via the same
+<code>POST /druid/indexer/v1/supervisor</code> endpoint used to initially create the supervisor. The Overlord will initiate a
+graceful shutdown of the existing supervisor which will cause the tasks being managed by that supervisor to stop reading
+and begin publishing their segments. A new supervisor will then be started which will create a new set of tasks that
+will start reading from the offsets where the previous now-publishing tasks left off, but using the updated schema.
+In this way, configuration changes can be applied without requiring any pause in ingestion.</p>
+<h3><a class="anchor" aria-hidden="true" id="deployment-notes"></a><a href="#deployment-notes" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Deployment Notes</h3>
+<h4><a class="anchor" aria-hidden="true" id="on-the-subject-of-segments"></a><a href="#on-the-subject-of-segments" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>On the Subject of Segments</h4>
+<p>Each Kafka Indexing Task puts events consumed from Kafka partitions assigned to it in a single segment for each segment
+granular interval until maxRowsPerSegment, maxTotalRows or intermediateHandoffPeriod limit is reached, at this point a new partition
+for this segment granularity is created for further events. Kafka Indexing Task also does incremental hand-offs which
+means that all the segments created by a task will not be held up till the task duration is over. As soon as maxRowsPerSegment,
+maxTotalRows or intermediateHandoffPeriod limit is hit, all the segments held by the task at that point in time will be handed-off
+and new set of segments will be created for further events. This means that the task can run for longer durations of time
+without accumulating old segments locally on Middle Manager processes and it is encouraged to do so.</p>
+<p>Kafka Indexing Service may still produce some small segments. Lets say the task duration is 4 hours, segment granularity
+is set to an HOUR and Supervisor was started at 9:10 then after 4 hours at 13:10, new set of tasks will be started and
+events for the interval 13:00 - 14:00 may be split across previous and new set of tasks. If you see it becoming a problem then
+one can schedule re-indexing tasks be run to merge segments together into new segments of an ideal size (in the range of ~500-700 MB per segment).
+Details on how to optimize the segment size can be found on <a href="/docs/0.20.0/operations/segment-optimization.html">Segment size optimization</a>.
+There is also ongoing work to support automatic segment compaction of sharded segments as well as compaction not requiring
+Hadoop (see <a href="https://github.com/apache/druid/pull/5102">here</a>).</p>
+</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/0.20.0/ingestion/data-management.html"><span class="arrow-prev">← </span><span>Data management</span></a><a class="docs-next button" href="/docs/0.20.0/development/extensions-core/kinesis-ingestion.html"><span>Amazon Kinesis</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#tutorial">Tutorial</a></li><li><a href="#submitting-a-supervisor-spec">Submitting a Supervisor Spec</a></li><li><a href="#supervisor-configuration">Supervisor Configuration</a><ul class="toc-headings"><li><a href="#kafkasupervisorioconfig">KafkaSupervisorIOConfig</a></li><li><a href="#kafkasupervisortuningconfig">KafkaSupervisorTuningConfig</a></li></ul></li><li><a href="#operations">Operations</a><ul class="toc-headings"><li><a href="#getting-supervisor-status-report">Getting Supervisor Status Report</a></li><li><a href="#getting-supervisor-ingestion-stats-report">Getting Supervisor Ingestion Stats Report</a></li><li><a href="#supervisor-health-check">Supervisor Health Check</a></li><li><a href="#updating-existing-supervisors">Updating Existing Supervisors</a></li><li><a href="#suspending-and-resuming-supervisors">Suspending and Resuming Supervisors</a></li><li><a href="#resetting-supervisors">Resetting Supervisors</a></li><li><a href="#terminating-supervisors">Terminating Supervisors</a></li><li><a href="#capacity-planning">Capacity Planning</a></li><li><a href="#supervisor-persistence">Supervisor Persistence</a></li><li><a href="#schemaconfiguration-changes">Schema/Configuration Changes</a></li><li><a href="#deployment-notes">Deployment Notes</a></li></ul></li></ul></nav></div><footer class="nav-footer druid-footer" id="footer"><div class="container"><div class="text-center"><p><a href="/technology">Technology</a> · <a href="/use-cases">Use Cases</a> · <a href="/druid-powered">Powered by Druid</a> · <a href="/docs/0.20.0/latest">Docs</a> · <a href="/community/">Community</a> · <a href="/downloads.html">Download</a> · <a href="/faq">FAQ</a></p></div><div class="text-center"><a title="Join the user group" href="https://groups.google.com/forum/#!forum/druid-user" target="_blank"><span class="fa fa-comments"></span></a> · <a title="Follow Druid" href="https://twitter.com/druidio" target="_blank"><span class="fab fa-twitter"></span></a> · <a title="Download via Apache" href="https://www.apache.org/dyn/closer.cgi?path=/incubator/druid/{{ site.druid_versions[0].versions[0].version }}/apache-druid-{{ site.druid_versions[0].versions[0].version }}-bin.tar.gz" target="_blank"><span class="fas fa-feather"></span></a> · <a title="GitHub" href="https://github.com/apache/druid" target="_blank"><span class="fab fa-github"></span></a></div><div class="text-center license">Copyright © 2019 <a href="https://www.apache.org/" target="_blank">Apache Software Foundation</a>.<br/>Except where otherwise noted, licensed under <a rel="license" href="http://creativecommons.org/licenses/by-sa/4.0/">CC BY-SA 4.0</a>.<br/>Apache Druid, Druid, and the Druid logo are either registered trademarks or trademarks of The Apache Software Foundation in the United States and other countries.</div></div></footer></div><script type="text/javascript" src="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.js"></script><script>
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+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Amazon Kinesis ingestion · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/0.20.0/development/extensions-core/kinesis-ingestion.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.20.0" /><meta property="og:title" content="Amazon Kinesis ingestion · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
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+<p>Similar to the <a href="/docs/0.20.0/development/extensions-core/kafka-ingestion.html">Kafka indexing service</a>, the Kinesis indexing service enables the configuration of <em>supervisors</em> on the Overlord, which facilitate ingestion from
+Kinesis by managing the creation and lifetime of Kinesis indexing tasks. These indexing tasks read events using Kinesis's own
+Shards and Sequence Number mechanism and are therefore able to provide guarantees of exactly-once ingestion.
+The supervisor oversees the state of the indexing tasks to coordinate handoffs, manage failures,
+and ensure that the scalability and replication requirements are maintained.</p>
+<p>The Kinesis indexing service is provided as the <code>druid-kinesis-indexing-service</code> core Apache Druid extension (see
+<a href="/docs/0.20.0/development/extensions.html#loading-extensions">Including Extensions</a>). Please note that this is
+currently designated as an <em>experimental feature</em> and is subject to the usual
+<a href="/docs/0.20.0/development/experimental.html">experimental caveats</a>.</p>
+<h2><a class="anchor" aria-hidden="true" id="submitting-a-supervisor-spec"></a><a href="#submitting-a-supervisor-spec" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Submitting a Supervisor Spec</h2>
+<p>The Kinesis indexing service requires that the <code>druid-kinesis-indexing-service</code> extension be loaded on both the Overlord
+and the MiddleManagers. A supervisor for a dataSource is started by submitting a supervisor spec via HTTP POST to
+<code>http://&lt;OVERLORD_IP&gt;:&lt;OVERLORD_PORT&gt;/druid/indexer/v1/supervisor</code>, for example:</p>
+<pre><code class="hljs">curl -X POST -H <span class="hljs-string">'Content-Type: application/json'</span> -d @supervisor-spec.json http:<span class="hljs-regexp">//</span>localhost:<span class="hljs-number">8090</span><span class="hljs-regexp">/druid/i</span>ndexer<span class="hljs-regexp">/v1/</span>supervisor
+</code></pre>
+<p>A sample supervisor spec is shown below:</p>
+<pre><code class="hljs css language-json">{
+  <span class="hljs-attr">"type"</span>: <span class="hljs-string">"kinesis"</span>,
+  <span class="hljs-attr">"dataSchema"</span>: {
+    <span class="hljs-attr">"dataSource"</span>: <span class="hljs-string">"metrics-kinesis"</span>,
+    <span class="hljs-attr">"timestampSpec"</span>: {
+      <span class="hljs-attr">"column"</span>: <span class="hljs-string">"timestamp"</span>,
+      <span class="hljs-attr">"format"</span>: <span class="hljs-string">"auto"</span>
+    },
+    <span class="hljs-attr">"dimensionsSpec"</span>: {
+      <span class="hljs-attr">"dimensions"</span>: [],
+      <span class="hljs-attr">"dimensionExclusions"</span>: [
+        <span class="hljs-string">"timestamp"</span>,
+        <span class="hljs-string">"value"</span>
+      ]
+    },
+    <span class="hljs-attr">"metricsSpec"</span>: [
+      {
+        <span class="hljs-attr">"name"</span>: <span class="hljs-string">"count"</span>,
+        <span class="hljs-attr">"type"</span>: <span class="hljs-string">"count"</span>
+      },
+      {
+        <span class="hljs-attr">"name"</span>: <span class="hljs-string">"value_sum"</span>,
+        <span class="hljs-attr">"fieldName"</span>: <span class="hljs-string">"value"</span>,
+        <span class="hljs-attr">"type"</span>: <span class="hljs-string">"doubleSum"</span>
+      },
+      {
+        <span class="hljs-attr">"name"</span>: <span class="hljs-string">"value_min"</span>,
+        <span class="hljs-attr">"fieldName"</span>: <span class="hljs-string">"value"</span>,
+        <span class="hljs-attr">"type"</span>: <span class="hljs-string">"doubleMin"</span>
+      },
+      {
+        <span class="hljs-attr">"name"</span>: <span class="hljs-string">"value_max"</span>,
+        <span class="hljs-attr">"fieldName"</span>: <span class="hljs-string">"value"</span>,
+        <span class="hljs-attr">"type"</span>: <span class="hljs-string">"doubleMax"</span>
+      }
+    ],
+    <span class="hljs-attr">"granularitySpec"</span>: {
+      <span class="hljs-attr">"type"</span>: <span class="hljs-string">"uniform"</span>,
+      <span class="hljs-attr">"segmentGranularity"</span>: <span class="hljs-string">"HOUR"</span>,
+      <span class="hljs-attr">"queryGranularity"</span>: <span class="hljs-string">"NONE"</span>
+    }
+  },
+  <span class="hljs-attr">"ioConfig"</span>: {
+    <span class="hljs-attr">"stream"</span>: <span class="hljs-string">"metrics"</span>,
+    <span class="hljs-attr">"inputFormat"</span>: {
+      <span class="hljs-attr">"type"</span>: <span class="hljs-string">"json"</span>
+    },
+    <span class="hljs-attr">"endpoint"</span>: <span class="hljs-string">"kinesis.us-east-1.amazonaws.com"</span>,
+    <span class="hljs-attr">"taskCount"</span>: <span class="hljs-number">1</span>,
+    <span class="hljs-attr">"replicas"</span>: <span class="hljs-number">1</span>,
+    <span class="hljs-attr">"taskDuration"</span>: <span class="hljs-string">"PT1H"</span>,
+    <span class="hljs-attr">"recordsPerFetch"</span>: <span class="hljs-number">2000</span>,
+    <span class="hljs-attr">"fetchDelayMillis"</span>: <span class="hljs-number">1000</span>
+  },
+  <span class="hljs-attr">"tuningConfig"</span>: {
+    <span class="hljs-attr">"type"</span>: <span class="hljs-string">"kinesis"</span>,
+    <span class="hljs-attr">"maxRowsPerSegment"</span>: <span class="hljs-number">5000000</span>
+  }
+}
+</code></pre>
+<h2><a class="anchor" aria-hidden="true" id="supervisor-spec"></a><a href="#supervisor-spec" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Supervisor Spec</h2>
+<table>
+<thead>
+<tr><th>Field</th><th>Description</th><th>Required</th></tr>
+</thead>
+<tbody>
+<tr><td><code>type</code></td><td>The supervisor type, this should always be <code>kinesis</code>.</td><td>yes</td></tr>
+<tr><td><code>dataSchema</code></td><td>The schema that will be used by the Kinesis indexing task during ingestion. See <a href="/docs/0.20.0/ingestion/index.html#dataschema"><code>dataSchema</code></a>.</td><td>yes</td></tr>
+<tr><td><code>ioConfig</code></td><td>A KinesisSupervisorIOConfig object for configuring Kafka connection and I/O-related settings for the supervisor and indexing task. See <a href="#kinesissupervisorioconfig">KinesisSupervisorIOConfig</a> below.</td><td>yes</td></tr>
+<tr><td><code>tuningConfig</code></td><td>A KinesisSupervisorTuningConfig object for configuring performance-related settings for the supervisor and indexing tasks. See <a href="#kinesissupervisortuningconfig">KinesisSupervisorTuningConfig</a> below.</td><td>no</td></tr>
+</tbody>
+</table>
+<h3><a class="anchor" aria-hidden="true" id="kinesissupervisorioconfig"></a><a href="#kinesissupervisorioconfig" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>KinesisSupervisorIOConfig</h3>
+<table>
+<thead>
+<tr><th>Field</th><th>Type</th><th>Description</th><th>Required</th></tr>
+</thead>
+<tbody>
+<tr><td><code>stream</code></td><td>String</td><td>The Kinesis stream to read.</td><td>yes</td></tr>
+<tr><td><code>inputFormat</code></td><td>Object</td><td><a href="/docs/0.20.0/ingestion/data-formats.html#input-format"><code>inputFormat</code></a> to specify how to parse input data. See <a href="#specifying-data-format">the below section</a> for details about specifying the input format.</td><td>yes</td></tr>
+<tr><td><code>endpoint</code></td><td>String</td><td>The AWS Kinesis stream endpoint for a region. You can find a list of endpoints <a href="http://docs.aws.amazon.com/general/latest/gr/rande.html#ak_region">here</a>.</td><td>no (default == kinesis.us-east-1.amazonaws.com)</td></tr>
+<tr><td><code>replicas</code></td><td>Integer</td><td>The number of replica sets, where 1 means a single set of tasks (no replication). Replica tasks will always be assigned to different workers to provide resiliency against process failure.</td><td>no (default == 1)</td></tr>
+<tr><td><code>taskCount</code></td><td>Integer</td><td>The maximum number of <em>reading</em> tasks in a <em>replica set</em>. This means that the maximum number of reading tasks will be <code>taskCount * replicas</code> and the total number of tasks (<em>reading</em> + <em>publishing</em>) will be higher than this. See <a href="#capacity-planning">Capacity Planning</a> below for more details. The number of reading tasks will be less than <code>taskCount</code> if <code>taskCount &gt; {numKinesisShards}</code>.</td><td>no (default == 1)</td></tr>
+<tr><td><code>taskDuration</code></td><td>ISO8601 Period</td><td>The length of time before tasks stop reading and begin publishing their segment.</td><td>no (default == PT1H)</td></tr>
+<tr><td><code>startDelay</code></td><td>ISO8601 Period</td><td>The period to wait before the supervisor starts managing tasks.</td><td>no (default == PT5S)</td></tr>
+<tr><td><code>period</code></td><td>ISO8601 Period</td><td>How often the supervisor will execute its management logic. Note that the supervisor will also run in response to certain events (such as tasks succeeding, failing, and reaching their taskDuration) so this value specifies the maximum time between iterations.</td><td>no (default == PT30S)</td></tr>
+<tr><td><code>useEarliestSequenceNumber</code></td><td>Boolean</td><td>If a supervisor is managing a dataSource for the first time, it will obtain a set of starting sequence numbers from Kinesis. This flag determines whether it retrieves the earliest or latest sequence numbers in Kinesis. Under normal circumstances, subsequent tasks will start from where the previous segments ended so this flag will only be used on first run.</td><td>no (default == false)</td></tr>
+<tr><td><code>completionTimeout</code></td><td>ISO8601 Period</td><td>The length of time to wait before declaring a publishing task as failed and terminating it. If this is set too low, your tasks may never publish. The publishing clock for a task begins roughly after <code>taskDuration</code> elapses.</td><td>no (default == PT6H)</td></tr>
+<tr><td><code>lateMessageRejectionPeriod</code></td><td>ISO8601 Period</td><td>Configure tasks to reject messages with timestamps earlier than this period before the task was created; for example if this is set to <code>PT1H</code> and the supervisor creates a task at <em>2016-01-01T12:00Z</em>, messages with timestamps earlier than <em>2016-01-01T11:00Z</em> will be dropped. This may help prevent concurrency issues if your data stream has late messages and you have multiple pipelines that need to operate on the same segments (e.g. a realtime and a nightly batch ingestion pipeline).</td><td>no (default == none)</td></tr>
+<tr><td><code>earlyMessageRejectionPeriod</code></td><td>ISO8601 Period</td><td>Configure tasks to reject messages with timestamps later than this period after the task reached its taskDuration; for example if this is set to <code>PT1H</code>, the taskDuration is set to <code>PT1H</code> and the supervisor creates a task at <em>2016-01-01T12:00Z</em>, messages with timestamps later than <em>2016-01-01T14:00Z</em> will be dropped. <strong>Note:</strong> Tasks sometimes run past their task duration, for example, in cases of supervisor failover. Setting earlyMessageRejectionPeriod too low may cause messages to be dropped unexpectedly whenever a task runs past its originally configured task duration.</td><td>no (default == none)</td></tr>
+<tr><td><code>recordsPerFetch</code></td><td>Integer</td><td>The number of records to request per GetRecords call to Kinesis. See 'Determining Fetch Settings' below.</td><td>no (default == 2000)</td></tr>
+<tr><td><code>fetchDelayMillis</code></td><td>Integer</td><td>Time in milliseconds to wait between subsequent GetRecords calls to Kinesis. See 'Determining Fetch Settings' below.</td><td>no (default == 1000)</td></tr>
+<tr><td><code>awsAssumedRoleArn</code></td><td>String</td><td>The AWS assumed role to use for additional permissions.</td><td>no</td></tr>
+<tr><td><code>awsExternalId</code></td><td>String</td><td>The AWS external id to use for additional permissions.</td><td>no</td></tr>
+<tr><td><code>deaggregate</code></td><td>Boolean</td><td>Whether to use the de-aggregate function of the KCL. See below for details.</td><td>no</td></tr>
+</tbody>
+</table>
+<h4><a class="anchor" aria-hidden="true" id="specifying-data-format"></a><a href="#specifying-data-format" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Specifying data format</h4>
+<p>Kinesis indexing service supports both <a href="/docs/0.20.0/ingestion/data-formats.html#input-format"><code>inputFormat</code></a> and <a href="/docs/0.20.0/ingestion/data-formats.html#parser"><code>parser</code></a> to specify the data format.
+The <code>inputFormat</code> is a new and recommended way to specify the data format for Kinesis indexing service,
+but unfortunately, it doesn't support all data formats supported by the legacy <code>parser</code>.
+(They will be supported in the future.)</p>
+<p>The supported <code>inputFormat</code>s include <a href="/docs/0.20.0/ingestion/data-formats.html#csv"><code>csv</code></a>,
+<a href="/docs/0.20.0/ingestion/data-formats.html#tsv-delimited"><code>delimited</code></a>, and <a href="/docs/0.20.0/ingestion/data-formats.html#json"><code>json</code></a>.
+You can also read <a href="/docs/0.20.0/ingestion/data-formats.html#avro-stream-parser"><code>avro_stream</code></a>,
+<a href="/docs/0.20.0/ingestion/data-formats.html#protobuf-parser"><code>protobuf</code></a>,
+and <a href="/docs/0.20.0/development/extensions-contrib/thrift.html"><code>thrift</code></a> formats using <code>parser</code>.</p>
+<p><a name="tuningconfig"></a></p>
+<h3><a class="anchor" aria-hidden="true" id="kinesissupervisortuningconfig"></a><a href="#kinesissupervisortuningconfig" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>KinesisSupervisorTuningConfig</h3>
+<p>The tuningConfig is optional and default parameters will be used if no tuningConfig is specified.</p>
+<table>
+<thead>
+<tr><th>Field</th><th>Type</th><th>Description</th><th>Required</th></tr>
+</thead>
+<tbody>
+<tr><td><code>type</code></td><td>String</td><td>The indexing task type, this should always be <code>kinesis</code>.</td><td>yes</td></tr>
+<tr><td><code>maxRowsInMemory</code></td><td>Integer</td><td>The number of rows to aggregate before persisting. This number is the post-aggregation rows, so it is not equivalent to the number of input events, but the number of aggregated rows that those events result in. This is used to manage the required JVM heap size. Maximum heap memory usage for indexing scales with maxRowsInMemory * (2 + maxPendingPersists).</td><td>no (default == 100000)</td></tr>
+<tr><td><code>maxBytesInMemory</code></td><td>Long</td><td>The number of bytes to aggregate in heap memory before persisting. This is based on a rough estimate of memory usage and not actual usage. Normally this is computed internally and user does not need to set it. The maximum heap memory usage for indexing is maxBytesInMemory * (2 + maxPendingPersists).</td><td>no (default == One-sixth of max JVM memory)</td></tr>
+<tr><td><code>maxRowsPerSegment</code></td><td>Integer</td><td>The number of rows to aggregate into a segment; this number is post-aggregation rows. Handoff will happen either if <code>maxRowsPerSegment</code> or <code>maxTotalRows</code> is hit or every <code>intermediateHandoffPeriod</code>, whichever happens earlier.</td><td>no (default == 5000000)</td></tr>
+<tr><td><code>maxTotalRows</code></td><td>Long</td><td>The number of rows to aggregate across all segments; this number is post-aggregation rows. Handoff will happen either if <code>maxRowsPerSegment</code> or <code>maxTotalRows</code> is hit or every <code>intermediateHandoffPeriod</code>, whichever happens earlier.</td><td>no (default == unlimited)</td></tr>
+<tr><td><code>intermediatePersistPeriod</code></td><td>ISO8601 Period</td><td>The period that determines the rate at which intermediate persists occur.</td><td>no (default == PT10M)</td></tr>
+<tr><td><code>maxPendingPersists</code></td><td>Integer</td><td>Maximum number of persists that can be pending but not started. If this limit would be exceeded by a new intermediate persist, ingestion will block until the currently-running persist finishes. Maximum heap memory usage for indexing scales with maxRowsInMemory * (2 + maxPendingPersists).</td><td>no (default == 0, meaning one persist can be running concurrently with ingestion, and none can be queued up)</td></tr>
+<tr><td><code>indexSpec</code></td><td>Object</td><td>Tune how data is indexed. See <a href="#indexspec">IndexSpec</a> for more information.</td><td>no</td></tr>
+<tr><td><code>indexSpecForIntermediatePersists</code></td><td></td><td>Defines segment storage format options to be used at indexing time for intermediate persisted temporary segments. This can be used to disable dimension/metric compression on intermediate segments to reduce memory required for final merging. However, disabling compression on intermediate segments might increase page cache use while they are used before getting merged into final segment published, see <a href="#indexspec">IndexSpec</a> for possible values.</td><td>no (default = same as indexSpec)</td></tr>
+<tr><td><code>reportParseExceptions</code></td><td>Boolean</td><td>If true, exceptions encountered during parsing will be thrown and will halt ingestion; if false, unparseable rows and fields will be skipped.</td><td>no (default == false)</td></tr>
+<tr><td><code>handoffConditionTimeout</code></td><td>Long</td><td>Milliseconds to wait for segment handoff. It must be &gt;= 0, where 0 means to wait forever.</td><td>no (default == 0)</td></tr>
+<tr><td><code>resetOffsetAutomatically</code></td><td>Boolean</td><td>Controls behavior when Druid needs to read Kinesis messages that are no longer available.<br/><br/>If false, the exception will bubble up, which will cause your tasks to fail and ingestion to halt. If this occurs, manual intervention is required to correct the situation; potentially using the <a href="../../operations/api-reference.html#supervisors">Reset Supervisor API</a>. This mode is useful for production, since it will make you aware of issues with ingestion.<br/><br/>If true, Druid will automatically reset to the earlier or latest sequence number available in Kinesis, based on the value of the <code>useEarliestSequenceNumber</code> property (earliest if true, latest if false). Please note that this can lead to data being <em>DROPPED</em> (if <code>useEarliestSequenceNumber</code> is false) or <em>DUPLICATED</em> (if <code>useEarliestSequenceNumber</code> is true) without your knowledge. Messages will be logged indicating that a reset has occurred, but ingestion will continue. This mode is useful for non-production situations, since it will make Druid attempt to recover from problems automatically, even if they lead to quiet dropping or duplicating of data.</td><td>no (default == false)</td></tr>
+<tr><td><code>skipSequenceNumberAvailabilityCheck</code></td><td>Boolean</td><td>Whether to enable checking if the current sequence number is still available in a particular Kinesis shard. If set to false, the indexing task will attempt to reset the current sequence number (or not), depending on the value of <code>resetOffsetAutomatically</code>.</td><td>no (default == false)</td></tr>
+<tr><td><code>workerThreads</code></td><td>Integer</td><td>The number of threads that the supervisor uses to handle requests/responses for worker tasks, along with any other internal asynchronous operation.</td><td>no (default == min(10, taskCount))</td></tr>
+<tr><td><code>chatThreads</code></td><td>Integer</td><td>The number of threads that will be used for communicating with indexing tasks.</td><td>no (default == min(10, taskCount * replicas))</td></tr>
+<tr><td><code>chatRetries</code></td><td>Integer</td><td>The number of times HTTP requests to indexing tasks will be retried before considering tasks unresponsive.</td><td>no (default == 8)</td></tr>
+<tr><td><code>httpTimeout</code></td><td>ISO8601 Period</td><td>How long to wait for a HTTP response from an indexing task.</td><td>no (default == PT10S)</td></tr>
+<tr><td><code>shutdownTimeout</code></td><td>ISO8601 Period</td><td>How long to wait for the supervisor to attempt a graceful shutdown of tasks before exiting.</td><td>no (default == PT80S)</td></tr>
+<tr><td><code>recordBufferSize</code></td><td>Integer</td><td>Size of the buffer (number of events) used between the Kinesis fetch threads and the main ingestion thread.</td><td>no (default == 10000)</td></tr>
+<tr><td><code>recordBufferOfferTimeout</code></td><td>Integer</td><td>Length of time in milliseconds to wait for space to become available in the buffer before timing out.</td><td>no (default == 5000)</td></tr>
+<tr><td><code>recordBufferFullWait</code></td><td>Integer</td><td>Length of time in milliseconds to wait for the buffer to drain before attempting to fetch records from Kinesis again.</td><td>no (default == 5000)</td></tr>
+<tr><td><code>fetchSequenceNumberTimeout</code></td><td>Integer</td><td>Length of time in milliseconds to wait for Kinesis to return the earliest or latest sequence number for a shard. Kinesis will not return the latest sequence number if no data is actively being written to that shard. In this case, this fetch call will repeatedly timeout and retry until fresh data is written to the stream.</td><td>no (default == 60000)</td></tr>
+<tr><td><code>fetchThreads</code></td><td>Integer</td><td>Size of the pool of threads fetching data from Kinesis. There is no benefit in having more threads than Kinesis shards.</td><td>no (default == procs * 2, where &quot;procs&quot; is the number of processors on the server that the task is running on)</td></tr>
+<tr><td><code>segmentWriteOutMediumFactory</code></td><td>Object</td><td>Segment write-out medium to use when creating segments. See below for more information.</td><td>no (not specified by default, the value from <code>druid.peon.defaultSegmentWriteOutMediumFactory.type</code> is used)</td></tr>
+<tr><td><code>intermediateHandoffPeriod</code></td><td>ISO8601 Period</td><td>How often the tasks should hand off segments. Handoff will happen either if <code>maxRowsPerSegment</code> or <code>maxTotalRows</code> is hit or every <code>intermediateHandoffPeriod</code>, whichever happens earlier.</td><td>no (default == P2147483647D)</td></tr>
+<tr><td><code>logParseExceptions</code></td><td>Boolean</td><td>If true, log an error message when a parsing exception occurs, containing information about the row where the error occurred.</td><td>no, default == false</td></tr>
+<tr><td><code>maxParseExceptions</code></td><td>Integer</td><td>The maximum number of parse exceptions that can occur before the task halts ingestion and fails. Overridden if <code>reportParseExceptions</code> is set.</td><td>no, unlimited default</td></tr>
+<tr><td><code>maxSavedParseExceptions</code></td><td>Integer</td><td>When a parse exception occurs, Druid can keep track of the most recent parse exceptions. &quot;maxSavedParseExceptions&quot; limits how many exception instances will be saved. These saved exceptions will be made available after the task finishes in the <a href="/docs/0.20.0/ingestion/tasks.html#reports">task completion report</a>. Overridden if <code>reportParseExceptions</code> is set.</td><td>no, default == 0</td></tr>
+<tr><td><code>maxRecordsPerPoll</code></td><td>Integer</td><td>The maximum number of records/events to be fetched from buffer per poll. The actual maximum will be <code>Max(maxRecordsPerPoll, Max(bufferSize, 1))</code></td><td>no, default == 100</td></tr>
+<tr><td><code>repartitionTransitionDuration</code></td><td>ISO8601 Period</td><td>When shards are split or merged, the supervisor will recompute shard -&gt; task group mappings, and signal any running tasks created under the old mappings to stop early at (current time + <code>repartitionTransitionDuration</code>). Stopping the tasks early allows Druid to begin reading from the new shards more quickly. The repartition transition wait time controlled by this property gives the stream additional time to write records to the new shards after the split/merge, which helps avoid the issues with empty shard handling described at <a href="https://github.com/apache/druid/issues/7600">https://github.com/apache/druid/issues/7600</a>.</td><td>no, (default == PT2M)</td></tr>
+</tbody>
+</table>
+<h4><a class="anchor" aria-hidden="true" id="indexspec"></a><a href="#indexspec" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>IndexSpec</h4>
+<table>
+<thead>
+<tr><th>Field</th><th>Type</th><th>Description</th><th>Required</th></tr>
+</thead>
+<tbody>
+<tr><td>bitmap</td><td>Object</td><td>Compression format for bitmap indexes. Should be a JSON object. See <a href="#bitmap-types">Bitmap types</a> below for options.</td><td>no (defaults to Roaring)</td></tr>
+<tr><td>dimensionCompression</td><td>String</td><td>Compression format for dimension columns. Choose from <code>LZ4</code>, <code>LZF</code>, or <code>uncompressed</code>.</td><td>no (default == <code>LZ4</code>)</td></tr>
+<tr><td>metricCompression</td><td>String</td><td>Compression format for primitive type metric columns. Choose from <code>LZ4</code>, <code>LZF</code>, <code>uncompressed</code>, or <code>none</code>.</td><td>no (default == <code>LZ4</code>)</td></tr>
+<tr><td>longEncoding</td><td>String</td><td>Encoding format for metric and dimension columns with type long. Choose from <code>auto</code> or <code>longs</code>. <code>auto</code> encodes the values using sequence number or lookup table depending on column cardinality, and store them with variable size. <code>longs</code> stores the value as is with 8 bytes each.</td><td>no (default == <code>longs</code>)</td></tr>
+</tbody>
+</table>
+<h5><a class="anchor" aria-hidden="true" id="bitmap-types"></a><a href="#bitmap-types" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Bitmap types</h5>
+<p>For Roaring bitmaps:</p>
+<table>
+<thead>
+<tr><th>Field</th><th>Type</th><th>Description</th><th>Required</th></tr>
+</thead>
+<tbody>
+<tr><td><code>type</code></td><td>String</td><td>Must be <code>roaring</code>.</td><td>yes</td></tr>
+<tr><td><code>compressRunOnSerialization</code></td><td>Boolean</td><td>Use a run-length encoding where it is estimated as more space efficient.</td><td>no (default == <code>true</code>)</td></tr>
+</tbody>
+</table>
+<p>For Concise bitmaps:</p>
+<table>
+<thead>
+<tr><th>Field</th><th>Type</th><th>Description</th><th>Required</th></tr>
+</thead>
+<tbody>
+<tr><td><code>type</code></td><td>String</td><td>Must be <code>concise</code>.</td><td>yes</td></tr>
+</tbody>
+</table>
+<h4><a class="anchor" aria-hidden="true" id="segmentwriteoutmediumfactory"></a><a href="#segmentwriteoutmediumfactory" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>SegmentWriteOutMediumFactory</h4>
+<table>
+<thead>
+<tr><th>Field</th><th>Type</th><th>Description</th><th>Required</th></tr>
+</thead>
+<tbody>
+<tr><td><code>type</code></td><td>String</td><td>See <a href="../../configuration/index.html#segmentwriteoutmediumfactory">Additional Peon Configuration: SegmentWriteOutMediumFactory</a> for explanation and available options.</td><td>yes</td></tr>
+</tbody>
+</table>
+<h2><a class="anchor" aria-hidden="true" id="operations"></a><a href="#operations" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Operations</h2>
+<p>This section gives descriptions of how some supervisor APIs work specifically in Kinesis Indexing Service.
+For all supervisor APIs, please check <a href="../../operations/api-reference.html#supervisors">Supervisor APIs</a>.</p>
+<h3><a class="anchor" aria-hidden="true" id="aws-authentication"></a><a href="#aws-authentication" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>AWS Authentication</h3>
+<p>To authenticate with AWS, you must provide your AWS access key and AWS secret key via runtime.properties, for example:</p>
+<pre><code class="hljs">-<span class="hljs-module-access"><span class="hljs-module"><span class="hljs-identifier">Ddruid</span>.</span></span>kinesis.accessKey=<span class="hljs-number">123</span> -<span class="hljs-module-access"><span class="hljs-module"><span class="hljs-identifier">Ddruid</span>.</span></span>kinesis.secretKey=<span class="hljs-number">456</span>
+</code></pre>
+<p>The AWS access key ID and secret access key are used for Kinesis API requests. If this is not provided, the service will
+look for credentials set in environment variables, in the default profile configuration file, and from the EC2 instance
+profile provider (in this order).</p>
+<h3><a class="anchor" aria-hidden="true" id="getting-supervisor-status-report"></a><a href="#getting-supervisor-status-report" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Getting Supervisor Status Report</h3>
+<p><code>GET /druid/indexer/v1/supervisor/&lt;supervisorId&gt;/status</code> returns a snapshot report of the current state of the tasks
+managed by the given supervisor. This includes the latest sequence numbers as reported by Kinesis. Unlike the Kafka
+Indexing Service, Kinesis reports lag metrics measured in time difference in milliseconds between the current sequence number and latest sequence number, rather than message count.</p>
+<p>The status report also contains the supervisor's state and a list of recently thrown exceptions (reported as
+<code>recentErrors</code>, whose max size can be controlled using the <code>druid.supervisor.maxStoredExceptionEvents</code> configuration).
+There are two fields related to the supervisor's state - <code>state</code> and <code>detailedState</code>. The <code>state</code> field will always be
+one of a small number of generic states that are applicable to any type of supervisor, while the <code>detailedState</code> field
+will contain a more descriptive, implementation-specific state that may provide more insight into the supervisor's
+activities than the generic <code>state</code> field.</p>
+<p>The list of possible <code>state</code> values are: [<code>PENDING</code>, <code>RUNNING</code>, <code>SUSPENDED</code>, <code>STOPPING</code>, <code>UNHEALTHY_SUPERVISOR</code>, <code>UNHEALTHY_TASKS</code>]</p>
+<p>The list of <code>detailedState</code> values and their corresponding <code>state</code> mapping is as follows:</p>
+<table>
+<thead>
+<tr><th>Detailed State</th><th>Corresponding State</th><th>Description</th></tr>
+</thead>
+<tbody>
+<tr><td>UNHEALTHY_SUPERVISOR</td><td>UNHEALTHY_SUPERVISOR</td><td>The supervisor has encountered errors on the past <code>druid.supervisor.unhealthinessThreshold</code> iterations</td></tr>
+<tr><td>UNHEALTHY_TASKS</td><td>UNHEALTHY_TASKS</td><td>The last <code>druid.supervisor.taskUnhealthinessThreshold</code> tasks have all failed</td></tr>
+<tr><td>UNABLE_TO_CONNECT_TO_STREAM</td><td>UNHEALTHY_SUPERVISOR</td><td>The supervisor is encountering connectivity issues with Kinesis and has not successfully connected in the past</td></tr>
+<tr><td>LOST_CONTACT_WITH_STREAM</td><td>UNHEALTHY_SUPERVISOR</td><td>The supervisor is encountering connectivity issues with Kinesis but has successfully connected in the past</td></tr>
+<tr><td>PENDING (first iteration only)</td><td>PENDING</td><td>The supervisor has been initialized and hasn't started connecting to the stream</td></tr>
+<tr><td>CONNECTING_TO_STREAM (first iteration only)</td><td>RUNNING</td><td>The supervisor is trying to connect to the stream and update partition data</td></tr>
+<tr><td>DISCOVERING_INITIAL_TASKS (first iteration only)</td><td>RUNNING</td><td>The supervisor is discovering already-running tasks</td></tr>
+<tr><td>CREATING_TASKS (first iteration only)</td><td>RUNNING</td><td>The supervisor is creating tasks and discovering state</td></tr>
+<tr><td>RUNNING</td><td>RUNNING</td><td>The supervisor has started tasks and is waiting for taskDuration to elapse</td></tr>
+<tr><td>SUSPENDED</td><td>SUSPENDED</td><td>The supervisor has been suspended</td></tr>
+<tr><td>STOPPING</td><td>STOPPING</td><td>The supervisor is stopping</td></tr>
+</tbody>
+</table>
+<p>On each iteration of the supervisor's run loop, the supervisor completes the following tasks in sequence:</p>
+<ol>
+<li>Fetch the list of shards from Kinesis and determine the starting sequence number for each shard (either based on the
+last processed sequence number if continuing, or starting from the beginning or ending of the stream if this is a new stream).</li>
+<li>Discover any running indexing tasks that are writing to the supervisor's datasource and adopt them if they match
+the supervisor's configuration, else signal them to stop.</li>
+<li>Send a status request to each supervised task to update our view of the state of the tasks under our supervision.</li>
+<li>Handle tasks that have exceeded <code>taskDuration</code> and should transition from the reading to publishing state.</li>
+<li>Handle tasks that have finished publishing and signal redundant replica tasks to stop.</li>
+<li>Handle tasks that have failed and clean up the supervisor's internal state.</li>
+<li>Compare the list of healthy tasks to the requested <code>taskCount</code> and <code>replicas</code> configurations and create additional tasks if required.</li>
+</ol>
+<p>The <code>detailedState</code> field will show additional values (those marked with &quot;first iteration only&quot;) the first time the
+supervisor executes this run loop after startup or after resuming from a suspension. This is intended to surface
+initialization-type issues, where the supervisor is unable to reach a stable state (perhaps because it can't connect to
+Kinesis, it can't read from the stream, or it can't communicate with existing tasks). Once the supervisor is stable -
+that is, once it has completed a full execution without encountering any issues - <code>detailedState</code> will show a <code>RUNNING</code>
+state until it is stopped, suspended, or hits a failure threshold and transitions to an unhealthy state.</p>
+<h3><a class="anchor" aria-hidden="true" id="updating-existing-supervisors"></a><a href="#updating-existing-supervisors" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Updating Existing Supervisors</h3>
+<p><code>POST /druid/indexer/v1/supervisor</code> can be used to update existing supervisor spec.
+Calling this endpoint when there is already an existing supervisor for the same dataSource will cause:</p>
+<ul>
+<li>The running supervisor to signal its managed tasks to stop reading and begin publishing.</li>
+<li>The running supervisor to exit.</li>
+<li>A new supervisor to be created using the configuration provided in the request body. This supervisor will retain the
+existing publishing tasks and will create new tasks starting at the sequence numbers the publishing tasks ended on.</li>
+</ul>
+<p>Seamless schema migrations can thus be achieved by simply submitting the new schema using this endpoint.</p>
+<h3><a class="anchor" aria-hidden="true" id="suspending-and-resuming-supervisors"></a><a href="#suspending-and-resuming-supervisors" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Suspending and Resuming Supervisors</h3>
+<p>You can suspend and resume a supervisor using <code>POST /druid/indexer/v1/supervisor/&lt;supervisorId&gt;/suspend</code> and <code>POST /druid/indexer/v1/supervisor/&lt;supervisorId&gt;/resume</code>, respectively.</p>
+<p>Note that the supervisor itself will still be operating and emitting logs and metrics,
+it will just ensure that no indexing tasks are running until the supervisor is resumed.</p>
+<h3><a class="anchor" aria-hidden="true" id="resetting-supervisors"></a><a href="#resetting-supervisors" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Resetting Supervisors</h3>
+<p>The <code>POST /druid/indexer/v1/supervisor/&lt;supervisorId&gt;/reset</code> operation clears stored
+sequence numbers, causing the supervisor to start reading from either the earliest or
+latest sequence numbers in Kinesis (depending on the value of <code>useEarliestSequenceNumber</code>).
+After clearing stored sequence numbers, the supervisor kills and recreates active tasks,
+so that tasks begin reading from valid sequence numbers.</p>
+<p>Use care when using this operation! Resetting the supervisor may cause Kinesis messages
+to be skipped or read twice, resulting in missing or duplicate data.</p>
+<p>The reason for using this operation is to recover from a state in which the supervisor
+ceases operating due to missing sequence numbers. The indexing service keeps track of the latest
+persisted sequence number in order to provide exactly-once ingestion guarantees across
+tasks.</p>
+<p>Subsequent tasks must start reading from where the previous task completed in
+order for the generated segments to be accepted. If the messages at the expected starting sequence numbers are
+no longer available in Kinesis (typically because the message retention period has elapsed or the topic was
+removed and re-created) the supervisor will refuse to start and in-flight tasks will fail. This operation
+enables you to recover from this condition.</p>
+<p>Note that the supervisor must be running for this endpoint to be available.</p>
+<h3><a class="anchor" aria-hidden="true" id="terminating-supervisors"></a><a href="#terminating-supervisors" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Terminating Supervisors</h3>
+<p>The <code>POST /druid/indexer/v1/supervisor/&lt;supervisorId&gt;/terminate</code> operation terminates a supervisor and causes
+all associated indexing tasks managed by this supervisor to immediately stop and begin
+publishing their segments. This supervisor will still exist in the metadata store and its history may be retrieved
+with the supervisor history API, but will not be listed in the 'get supervisors' API response nor can its configuration
+or status report be retrieved. The only way this supervisor can start again is by submitting a functioning supervisor
+spec to the create API.</p>
+<h3><a class="anchor" aria-hidden="true" id="capacity-planning"></a><a href="#capacity-planning" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Capacity Planning</h3>
+<p>Kinesis indexing tasks run on MiddleManagers and are thus limited by the resources available in the MiddleManager
+cluster. In particular, you should make sure that you have sufficient worker capacity (configured using the
+<code>druid.worker.capacity</code> property) to handle the configuration in the supervisor spec. Note that worker capacity is
+shared across all types of indexing tasks, so you should plan your worker capacity to handle your total indexing load
+(e.g. batch processing, realtime tasks, merging tasks, etc.). If your workers run out of capacity, Kinesis indexing tasks
+will queue and wait for the next available worker. This may cause queries to return partial results but will not result
+in data loss (assuming the tasks run before Kinesis purges those sequence numbers).</p>
+<p>A running task will normally be in one of two states: <em>reading</em> or <em>publishing</em>. A task will remain in reading state for
+<code>taskDuration</code>, at which point it will transition to publishing state. A task will remain in publishing state for as long
+as it takes to generate segments, push segments to deep storage, and have them be loaded and served by a Historical process
+(or until <code>completionTimeout</code> elapses).</p>
+<p>The number of reading tasks is controlled by <code>replicas</code> and <code>taskCount</code>. In general, there will be <code>replicas * taskCount</code>
+reading tasks, the exception being if taskCount &gt; {numKinesisShards} in which case {numKinesisShards} tasks will
+be used instead. When <code>taskDuration</code> elapses, these tasks will transition to publishing state and <code>replicas * taskCount</code>
+new reading tasks will be created. Therefore to allow for reading tasks and publishing tasks to run concurrently, there
+should be a minimum capacity of:</p>
+<pre><code class="hljs"><span class="hljs-attr">workerCapacity</span> = <span class="hljs-number">2</span> * replicas * taskCount
+</code></pre>
+<p>This value is for the ideal situation in which there is at most one set of tasks publishing while another set is reading.
+In some circumstances, it is possible to have multiple sets of tasks publishing simultaneously. This would happen if the
+time-to-publish (generate segment, push to deep storage, loaded on Historical) &gt; <code>taskDuration</code>. This is a valid
+scenario (correctness-wise) but requires additional worker capacity to support. In general, it is a good idea to have
+<code>taskDuration</code> be large enough that the previous set of tasks finishes publishing before the current set begins.</p>
+<h3><a class="anchor" aria-hidden="true" id="supervisor-persistence"></a><a href="#supervisor-persistence" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Supervisor Persistence</h3>
+<p>When a supervisor spec is submitted via the <code>POST /druid/indexer/v1/supervisor</code> endpoint, it is persisted in the
+configured metadata database. There can only be a single supervisor per dataSource, and submitting a second spec for
+the same dataSource will overwrite the previous one.</p>
+<p>When an Overlord gains leadership, either by being started or as a result of another Overlord failing, it will spawn
+a supervisor for each supervisor spec in the metadata database. The supervisor will then discover running Kinesis indexing
+tasks and will attempt to adopt them if they are compatible with the supervisor's configuration. If they are not
+compatible because they have a different ingestion spec or shard allocation, the tasks will be killed and the
+supervisor will create a new set of tasks. In this way, the supervisors are persistent across Overlord restarts and
+fail-overs.</p>
+<p>A supervisor is stopped via the <code>POST /druid/indexer/v1/supervisor/&lt;supervisorId&gt;/terminate</code> endpoint. This places a
+tombstone marker in the database (to prevent the supervisor from being reloaded on a restart) and then gracefully
+shuts down the currently running supervisor. When a supervisor is shut down in this way, it will instruct its
+managed tasks to stop reading and begin publishing their segments immediately. The call to the shutdown endpoint will
+return after all tasks have been signalled to stop but before the tasks finish publishing their segments.</p>
+<h3><a class="anchor" aria-hidden="true" id="schemaconfiguration-changes"></a><a href="#schemaconfiguration-changes" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Schema/Configuration Changes</h3>
+<p>Schema and configuration changes are handled by submitting the new supervisor spec via the same
+<code>POST /druid/indexer/v1/supervisor</code> endpoint used to initially create the supervisor. The Overlord will initiate a
+graceful shutdown of the existing supervisor which will cause the tasks being managed by that supervisor to stop reading
+and begin publishing their segments. A new supervisor will then be started which will create a new set of tasks that
+will start reading from the sequence numbers where the previous now-publishing tasks left off, but using the updated schema.
+In this way, configuration changes can be applied without requiring any pause in ingestion.</p>
+<h3><a class="anchor" aria-hidden="true" id="deployment-notes"></a><a href="#deployment-notes" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Deployment Notes</h3>
+<h4><a class="anchor" aria-hidden="true" id="on-the-subject-of-segments"></a><a href="#on-the-subject-of-segments" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>On the Subject of Segments</h4>
+<p>Each Kinesis Indexing Task puts events consumed from Kinesis Shards assigned to it in a single segment for each segment
+granular interval until maxRowsPerSegment, maxTotalRows or intermediateHandoffPeriod limit is reached, at this point a new shard
+for this segment granularity is created for further events. Kinesis Indexing Task also does incremental hand-offs which
+means that all the segments created by a task will not be held up till the task duration is over. As soon as maxRowsPerSegment,
+maxTotalRows or intermediateHandoffPeriod limit is hit, all the segments held by the task at that point in time will be handed-off
+and new set of segments will be created for further events. This means that the task can run for longer durations of time
+without accumulating old segments locally on Middle Manager processes and it is encouraged to do so.</p>
+<p>Kinesis Indexing Service may still produce some small segments. Lets say the task duration is 4 hours, segment granularity
+is set to an HOUR and Supervisor was started at 9:10 then after 4 hours at 13:10, new set of tasks will be started and
+events for the interval 13:00 - 14:00 may be split across previous and new set of tasks. If you see it becoming a problem then
+one can schedule re-indexing tasks be run to merge segments together into new segments of an ideal size (in the range of ~500-700 MB per segment).
+Details on how to optimize the segment size can be found on <a href="/docs/0.20.0/operations/segment-optimization.html">Segment size optimization</a>.
+There is also ongoing work to support automatic segment compaction of sharded segments as well as compaction not requiring
+Hadoop (see <a href="https://github.com/apache/druid/pull/5102">here</a>).</p>
+<h3><a class="anchor" aria-hidden="true" id="determining-fetch-settings"></a><a href="#determining-fetch-settings" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Determining Fetch Settings</h3>
+<p>Internally, the Kinesis Indexing Service uses the Kinesis Record Supplier abstraction for fetching Kinesis data records and storing the records
+locally. The way the Kinesis Record Supplier fetches records is to have a separate thread run the fetching operation per each Kinesis Shard, the
+max number of threads is determined by <code>fetchThreads</code>. For example, a Kinesis stream with 3 shards will have 3 threads, each fetching from a shard separately.
+There is a delay between each fetching operation, which is controlled by <code>fetchDelayMillis</code>. The maximum number of records to be fetched per thread per
+operation is controlled by <code>recordsPerFetch</code>. Note that this is not the same as <code>maxRecordsPerPoll</code>.</p>
+<p>The records fetched by each thread will be pushed to a queue in the order that they are fetched. The records are stored in this queue until <code>poll()</code> is called
+by either the supervisor or the indexing task. <code>poll()</code> will attempt to drain the internal buffer queue up to a limit of <code>max(maxRecordsPerPoll, q.size())</code>.
+Here <code>maxRecordsPerPoll</code> controls the theoretical maximum records to drain out of the buffer queue, so setting this parameter to a reasonable value is essential
+in preventing the queue from overflowing or memory exceeding heap size.</p>
+<p>Kinesis places the following restrictions on calls to fetch records:</p>
+<ul>
+<li>Each data record can be up to 1 MB in size.</li>
+<li>Each shard can support up to 5 transactions per second for reads.</li>
+<li>Each shard can read up to 2 MB per second.</li>
+<li>The maximum size of data that GetRecords can return is 10 MB.</li>
+</ul>
+<p>Values for <code>recordsPerFetch</code> and <code>fetchDelayMillis</code> should be chosen to maximize throughput under the above constraints.
+The values that you choose will depend on the average size of a record and the number of consumers you have reading from
+a given shard (which will be <code>replicas</code> unless you have other consumers also reading from this Kinesis stream).</p>
+<p>If the above limits are violated, AWS will throw ProvisionedThroughputExceededException errors on subsequent calls to
+read data. When this happens, the Kinesis indexing service will pause by <code>fetchDelayMillis</code> and then attempt the call
+again.</p>
+<p>Internally, each indexing task maintains a buffer that stores the fetched but not yet processed record. <code>recordsPerFetch</code> and <code>fetchDelayMillis</code>
+control this behavior. The number of records that the indexing task fetch from the buffer is controlled by <code>maxRecordsPerPoll</code>, which
+determines the number of records to be processed per each ingestion loop in the task.</p>
+<h2><a class="anchor" aria-hidden="true" id="deaggregation"></a><a href="#deaggregation" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Deaggregation</h2>
+<p>See <a href="https://github.com/apache/druid/issues/6714">issue</a></p>
+<p>The Kinesis indexing service supports de-aggregation of multiple rows packed into a single record by the Kinesis
+Producer Library's aggregate method for more efficient data transfer. Currently, enabling the de-aggregate functionality
+requires the user to manually provide the Kinesis Client Library on the classpath, since this library has a license not
+compatible with Apache projects.</p>
+<p>To enable this feature, add the <code>amazon-kinesis-client</code> (tested on version <code>1.9.2</code>) jar file (<a href="https://mvnrepository.com/artifact/com.amazonaws/amazon-kinesis-client/1.9.2">link</a>) under <code>dist/druid/extensions/druid-kinesis-indexing-service/</code>.
+Then when submitting a supervisor-spec, set <code>deaggregate</code> to true.</p>
+<h2><a class="anchor" aria-hidden="true" id="resharding"></a><a href="#resharding" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Resharding</h2>
+<p>When changing the shard count for a Kinesis stream, there will be a window of time around the resharding operation with early shutdown of Kinesis ingestion tasks and possible task failures.</p>
+<p>The early shutdowns and task failures are expected, and they occur because the supervisor will update the shard -&gt; task group mappings as shards are closed and fully read, to ensure that tasks are not running
+with an assignment of closed shards that have been fully read and to ensure a balanced distribution of active shards across tasks.</p>
+<p>This window with early task shutdowns and possible task failures will conclude when:</p>
+<ul>
+<li>All closed shards have been fully read and the Kinesis ingestion tasks have published the data from those shards, committing the &quot;closed&quot; state to metadata storage</li>
+<li>Any remaining tasks that had inactive shards in the assignment have been shutdown (these tasks would have been created before the closed shards were completely drained)</li>
+</ul>
+</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/0.20.0/development/extensions-core/kafka-ingestion.html"><span class="arrow-prev">← </span><span>Apache Kafka</span></a><a class="docs-next button" href="/docs/0.20.0/ingestion/tranquility.html"><span>Tranquility</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#submitting-a-supervisor-spec">Submitting a Supervisor Spec</a></li><li><a href="#supervisor-spec">Supervisor Spec</a><ul class="toc-headings"><li><a href="#kinesissupervisorioconfig">KinesisSupervisorIOConfig</a></li><li><a href="#kinesissupervisortuningconfig">KinesisSupervisorTuningConfig</a></li></ul></li><li><a href="#operations">Operations</a><ul class="toc-headings"><li><a href="#aws-authentication">AWS Authentication</a></li><li><a href="#getting-supervisor-status-report">Getting Supervisor Status Report</a></li><li><a href="#updating-existing-supervisors">Updating Existing Supervisors</a></li><li><a href="#suspending-and-resuming-supervisors">Suspending and Resuming Supervisors</a></li><li><a href="#resetting-supervisors">Resetting Supervisors</a></li><li><a href="#terminating-supervisors">Terminating Supervisors</a></li><li><a href="#capacity-planning">Capacity Planning</a></li><li><a href="#supervisor-persistence">Supervisor Persistence</a></li><li><a href="#schemaconfiguration-changes">Schema/Configuration Changes</a></li><li><a href="#deployment-notes">Deployment Notes</a></li><li><a href="#determining-fetch-settings">Determining Fetch Settings</a></li></ul></li><li><a href="#deaggregation">Deaggregation</a></li><li><a href="#resharding">Resharding</a></li></ul></nav></div><footer class="nav-footer druid-footer" id="footer"><div class="container"><div class="text-center"><p><a href="/technology">Technology</a> · <a href="/use-cases">Use Cases</a> · <a href="/druid-powered">Powered by Druid</a> · <a href="/docs/0.20.0/latest">Docs</a> · <a href="/community/">Community</a> · <a href="/downloads.html">Download</a> · <a href="/faq">FAQ</a></p></div><div class="text-center"><a title="Join the user group" href="https://groups.google.com/forum/#!forum/druid-user" target="_blank"><span class="fa fa-comments"></span></a> · <a title="Follow Druid" href="https://twitter.com/druidio" target="_blank"><span class="fab fa-twitter"></span></a> · <a title="Download via Apache" href="https://www.apache.org/dyn/closer.cgi?path=/incubator/druid/{{ site.druid_versions[0].versions[0].version }}/apache-druid-{{ site.druid_versions[0].versions[0].version }}-bin.tar.gz" target="_blank"><span class="fas fa-feather"></span></a> · <a title="GitHub" href="https://github.com/apache/druid" target="_blank"><span class="fab fa-github"></span></a></div><div class="text-center license">Copyright © 2019 <a href="https://www.apache.org/" target="_blank">Apache Software Foundation</a>.<br/>Except where otherwise noted, licensed under <a rel="license" href="http://creativecommons.org/licenses/by-sa/4.0/">CC BY-SA 4.0</a>.<br/>Apache Druid, Druid, and the Druid logo are either registered trademarks or trademarks of The Apache Software Foundation in the United States and other countries.</div></div></footer></div><script type="text/javascript" src="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.js"></script><script>
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+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
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+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+  -->
+<blockquote>
+<p>Lookups are an <a href="/docs/0.20.0/development/experimental.html">experimental</a> feature.</p>
+</blockquote>
+<p>To use this Apache Druid extension, make sure to <a href="/docs/0.20.0/development/extensions.html#loading-extensions">include</a> <code>druid-lookups-cached-global</code> as an extension.</p>
+<h2><a class="anchor" aria-hidden="true" id="configuration"></a><a href="#configuration" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Configuration</h2>
+<blockquote>
+<p>Static configuration is no longer supported. Lookups can be configured through
+<a href="/docs/0.20.0/querying/lookups.html#configuration">dynamic configuration</a>.</p>
+</blockquote>
+<p>Globally cached lookups are appropriate for lookups which are not possible to pass at query time due to their size,
+or are not desired to be passed at query time because the data is to reside in and be handled by the Druid servers,
+and are small enough to reasonably populate in-memory. This usually means tens to tens of thousands of entries per lookup.</p>
+<p>Globally cached lookups all draw from the same cache pool, allowing each process to have a fixed cache pool that can be used by cached lookups.</p>
+<p>Globally cached lookups can be specified as part of the <a href="/docs/0.20.0/querying/lookups.html">cluster wide config for lookups</a> as a type of <code>cachedNamespace</code></p>
+<pre><code class="hljs css language-json">{
+   <span class="hljs-attr">"type"</span>: <span class="hljs-string">"cachedNamespace"</span>,
+   <span class="hljs-attr">"extractionNamespace"</span>: {
+      <span class="hljs-attr">"type"</span>: <span class="hljs-string">"uri"</span>,
+      <span class="hljs-attr">"uri"</span>: <span class="hljs-string">"file:/tmp/prefix/"</span>,
+      <span class="hljs-attr">"namespaceParseSpec"</span>: {
+        <span class="hljs-attr">"format"</span>: <span class="hljs-string">"csv"</span>,
+        <span class="hljs-attr">"columns"</span>: [
+          <span class="hljs-string">"key"</span>,
+          <span class="hljs-string">"value"</span>
+        ]
+      },
+      <span class="hljs-attr">"pollPeriod"</span>: <span class="hljs-string">"PT5M"</span>
+    },
+    <span class="hljs-attr">"firstCacheTimeout"</span>: <span class="hljs-number">0</span>
+}
+</code></pre>
+<pre><code class="hljs css language-json">{
+   <span class="hljs-attr">"type"</span>: <span class="hljs-string">"cachedNamespace"</span>,
+   <span class="hljs-attr">"extractionNamespace"</span>: {
+      <span class="hljs-attr">"type"</span>: <span class="hljs-string">"jdbc"</span>,
+      <span class="hljs-attr">"connectorConfig"</span>: {
+        <span class="hljs-attr">"createTables"</span>: <span class="hljs-literal">true</span>,
+        <span class="hljs-attr">"connectURI"</span>: <span class="hljs-string">"jdbc:mysql:\/\/localhost:3306\/druid"</span>,
+        <span class="hljs-attr">"user"</span>: <span class="hljs-string">"druid"</span>,
+        <span class="hljs-attr">"password"</span>: <span class="hljs-string">"diurd"</span>
+      },
+      <span class="hljs-attr">"table"</span>: <span class="hljs-string">"lookupTable"</span>,
+      <span class="hljs-attr">"keyColumn"</span>: <span class="hljs-string">"mykeyColumn"</span>,
+      <span class="hljs-attr">"valueColumn"</span>: <span class="hljs-string">"myValueColumn"</span>,
+      <span class="hljs-attr">"filter"</span> : <span class="hljs-string">"myFilterSQL (Where clause statement  e.g LOOKUPTYPE=1)"</span>,
+      <span class="hljs-attr">"tsColumn"</span>: <span class="hljs-string">"timeColumn"</span>
+   },
+   <span class="hljs-attr">"firstCacheTimeout"</span>: <span class="hljs-number">120000</span>,
+   <span class="hljs-attr">"injective"</span>:<span class="hljs-literal">true</span>
+}
+</code></pre>
+<p>The parameters are as follows</p>
+<table>
+<thead>
+<tr><th>Property</th><th>Description</th><th>Required</th><th>Default</th></tr>
+</thead>
+<tbody>
+<tr><td><code>extractionNamespace</code></td><td>Specifies how to populate the local cache. See below</td><td>Yes</td><td>-</td></tr>
+<tr><td><code>firstCacheTimeout</code></td><td>How long to wait (in ms) for the first run of the cache to populate. 0 indicates to not wait</td><td>No</td><td><code>0</code> (do not wait)</td></tr>
+<tr><td><code>injective</code></td><td>If the underlying map is <a href="../../querying/lookups.html#query-execution">injective</a> (keys and values are unique) then optimizations can occur internally by setting this to <code>true</code></td><td>No</td><td><code>false</code></td></tr>
+</tbody>
+</table>
+<p>If <code>firstCacheTimeout</code> is set to a non-zero value, it should be less than <code>druid.manager.lookups.hostUpdateTimeout</code>. If <code>firstCacheTimeout</code> is NOT set, then management is essentially asynchronous and does not know if a lookup succeeded or failed in starting. In such a case logs from the processes using lookups should be monitored for repeated failures.</p>
+<p>Proper functionality of globally cached lookups requires the following extension to be loaded on the Broker, Peon, and Historical processes:
+<code>druid-lookups-cached-global</code></p>
+<h2><a class="anchor" aria-hidden="true" id="example-configuration"></a><a href="#example-configuration" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Example configuration</h2>
+<p>In a simple case where only one <a href="../../querying/lookups.html#dynamic-configuration">tier</a> exists (<code>realtime_customer2</code>) with one <code>cachedNamespace</code> lookup called <code>country_code</code>, the resulting configuration JSON looks similar to the following:</p>
+<pre><code class="hljs css language-json">{
+  <span class="hljs-attr">"realtime_customer2"</span>: {
+    <span class="hljs-attr">"country_code"</span>: {
+      <span class="hljs-attr">"version"</span>: <span class="hljs-string">"v0"</span>,
+      <span class="hljs-attr">"lookupExtractorFactory"</span>: {
+        <span class="hljs-attr">"type"</span>: <span class="hljs-string">"cachedNamespace"</span>,
+        <span class="hljs-attr">"extractionNamespace"</span>: {
+          <span class="hljs-attr">"type"</span>: <span class="hljs-string">"jdbc"</span>,
+          <span class="hljs-attr">"connectorConfig"</span>: {
+            <span class="hljs-attr">"createTables"</span>: <span class="hljs-literal">true</span>,
+            <span class="hljs-attr">"connectURI"</span>: <span class="hljs-string">"jdbc:mysql:\/\/localhost:3306\/druid"</span>,
+            <span class="hljs-attr">"user"</span>: <span class="hljs-string">"druid"</span>,
+            <span class="hljs-attr">"password"</span>: <span class="hljs-string">"diurd"</span>
+          },
+          <span class="hljs-attr">"table"</span>: <span class="hljs-string">"lookupValues"</span>,
+          <span class="hljs-attr">"keyColumn"</span>: <span class="hljs-string">"value_id"</span>,
+          <span class="hljs-attr">"valueColumn"</span>: <span class="hljs-string">"value_text"</span>,
+          <span class="hljs-attr">"filter"</span>: <span class="hljs-string">"value_type='country'"</span>,
+          <span class="hljs-attr">"tsColumn"</span>: <span class="hljs-string">"timeColumn"</span>
+        },
+        <span class="hljs-attr">"firstCacheTimeout"</span>: <span class="hljs-number">120000</span>,
+        <span class="hljs-attr">"injective"</span>: <span class="hljs-literal">true</span>
+      }
+    }
+  }
+}
+</code></pre>
+<p>Where the Coordinator endpoint <code>/druid/coordinator/v1/lookups/realtime_customer2/country_code</code> should return</p>
+<pre><code class="hljs css language-json">{
+  <span class="hljs-attr">"version"</span>: <span class="hljs-string">"v0"</span>,
+  <span class="hljs-attr">"lookupExtractorFactory"</span>: {
+    <span class="hljs-attr">"type"</span>: <span class="hljs-string">"cachedNamespace"</span>,
+    <span class="hljs-attr">"extractionNamespace"</span>: {
+      <span class="hljs-attr">"type"</span>: <span class="hljs-string">"jdbc"</span>,
+      <span class="hljs-attr">"connectorConfig"</span>: {
+        <span class="hljs-attr">"createTables"</span>: <span class="hljs-literal">true</span>,
+        <span class="hljs-attr">"connectURI"</span>: <span class="hljs-string">"jdbc:mysql://localhost:3306/druid"</span>,
+        <span class="hljs-attr">"user"</span>: <span class="hljs-string">"druid"</span>,
+        <span class="hljs-attr">"password"</span>: <span class="hljs-string">"diurd"</span>
+      },
+      <span class="hljs-attr">"table"</span>: <span class="hljs-string">"lookupValues"</span>,
+      <span class="hljs-attr">"keyColumn"</span>: <span class="hljs-string">"value_id"</span>,
+      <span class="hljs-attr">"valueColumn"</span>: <span class="hljs-string">"value_text"</span>,
+      <span class="hljs-attr">"filter"</span>: <span class="hljs-string">"value_type='country'"</span>,
+      <span class="hljs-attr">"tsColumn"</span>: <span class="hljs-string">"timeColumn"</span>
+    },
+    <span class="hljs-attr">"firstCacheTimeout"</span>: <span class="hljs-number">120000</span>,
+    <span class="hljs-attr">"injective"</span>: <span class="hljs-literal">true</span>
+  }
+}
+</code></pre>
+<h2><a class="anchor" aria-hidden="true" id="cache-settings"></a><a href="#cache-settings" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Cache Settings</h2>
+<p>Lookups are cached locally on Historical processes. The following are settings used by the processes which service queries when
+setting namespaces (Broker, Peon, Historical)</p>
+<table>
+<thead>
+<tr><th>Property</th><th>Description</th><th>Default</th></tr>
+</thead>
+<tbody>
+<tr><td><code>druid.lookup.namespace.cache.type</code></td><td>Specifies the type of caching to be used by the namespaces. May be one of [<code>offHeap</code>, <code>onHeap</code>]. <code>offHeap</code> uses a temporary file for off-heap storage of the namespace (memory mapped files). <code>onHeap</code> stores all cache on the heap in standard java map types.</td><td><code>onHeap</code></td></tr>
+<tr><td><code>druid.lookup.namespace.numExtractionThreads</code></td><td>The number of threads in the thread pool dedicated for lookup extraction and updates. This number may need to be scaled up, if you have a lot of lookups and they take long time to extract, to avoid timeouts.</td><td>2</td></tr>
+<tr><td><code>druid.lookup.namespace.numBufferedEntries</code></td><td>If using off-heap caching, the number of records to be stored on an on-heap buffer.</td><td>100,000</td></tr>
+</tbody>
+</table>
+<p>The cache is populated in different ways depending on the settings below. In general, most namespaces employ
+a <code>pollPeriod</code> at the end of which time they poll the remote resource of interest for updates.</p>
+<p><code>onHeap</code> uses <code>ConcurrentMap</code>s in the java heap, and thus affects garbage collection and heap sizing.
+<code>offHeap</code> uses an on-heap buffer and MapDB using memory-mapped files in the java temporary directory.
+So if total number of entries in the <code>cachedNamespace</code> is in excess of the buffer's configured capacity, the extra will be kept in memory as page cache, and paged in and out by general OS tunings.
+It's highly recommended that <code>druid.lookup.namespace.numBufferedEntries</code> is set when using <code>offHeap</code>, the value should be chosen from the range between 10% and 50% of the number of entries in the lookup.</p>
+<h2><a class="anchor" aria-hidden="true" id="supported-lookups"></a><a href="#supported-lookups" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Supported lookups</h2>
+<p>For additional lookups, please see our <a href="/docs/0.20.0/development/extensions.html">extensions list</a>.</p>
+<h3><a class="anchor" aria-hidden="true" id="uri-lookup"></a><a href="#uri-lookup" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>URI lookup</h3>
+<p>The remapping values for each globally cached lookup can be specified by a JSON object as per the following examples:</p>
+<pre><code class="hljs css language-json">{
+  <span class="hljs-attr">"type"</span>:<span class="hljs-string">"uri"</span>,
+  <span class="hljs-attr">"uri"</span>: <span class="hljs-string">"s3://bucket/some/key/prefix/renames-0003.gz"</span>,
+  <span class="hljs-attr">"namespaceParseSpec"</span>:{
+    <span class="hljs-attr">"format"</span>:<span class="hljs-string">"csv"</span>,
+    <span class="hljs-attr">"columns"</span>:[<span class="hljs-string">"key"</span>,<span class="hljs-string">"value"</span>]
+  },
+  <span class="hljs-attr">"pollPeriod"</span>:<span class="hljs-string">"PT5M"</span>
+}
+</code></pre>
+<pre><code class="hljs css language-json">{
+  <span class="hljs-attr">"type"</span>:<span class="hljs-string">"uri"</span>,
+  <span class="hljs-attr">"uriPrefix"</span>: <span class="hljs-string">"s3://bucket/some/key/prefix/"</span>,
+  <span class="hljs-attr">"fileRegex"</span>:<span class="hljs-string">"renames-[0-9]*\\.gz"</span>,
+  <span class="hljs-attr">"namespaceParseSpec"</span>:{
+    <span class="hljs-attr">"format"</span>:<span class="hljs-string">"csv"</span>,
+    <span class="hljs-attr">"columns"</span>:[<span class="hljs-string">"key"</span>,<span class="hljs-string">"value"</span>]
+  },
+  <span class="hljs-attr">"pollPeriod"</span>:<span class="hljs-string">"PT5M"</span>
+}
+</code></pre>
+<table>
+<thead>
+<tr><th>Property</th><th>Description</th><th>Required</th><th>Default</th></tr>
+</thead>
+<tbody>
+<tr><td><code>pollPeriod</code></td><td>Period between polling for updates</td><td>No</td><td>0 (only once)</td></tr>
+<tr><td><code>uri</code></td><td>URI for the file of interest, specified as a file, hdfs, or s3 path</td><td>No</td><td>Use <code>uriPrefix</code></td></tr>
+<tr><td><code>uriPrefix</code></td><td>A URI that specifies a directory (or other searchable resource) in which to search for files</td><td>No</td><td>Use <code>uri</code></td></tr>
+<tr><td><code>fileRegex</code></td><td>Optional regex for matching the file name under <code>uriPrefix</code>. Only used if <code>uriPrefix</code> is used</td><td>No</td><td><code>&quot;.*&quot;</code></td></tr>
+<tr><td><code>namespaceParseSpec</code></td><td>How to interpret the data at the URI</td><td>Yes</td><td></td></tr>
+</tbody>
+</table>
+<p>One of either <code>uri</code> or <code>uriPrefix</code> must be specified, as either a local file system (file://), HDFS (hdfs://), or S3 (s3://) location. HTTP location is not currently supported.</p>
+<p>The <code>pollPeriod</code> value specifies the period in ISO 8601 format between checks for replacement data for the lookup. If the source of the lookup is capable of providing a timestamp, the lookup will only be updated if it has changed since the prior tick of <code>pollPeriod</code>. A value of 0, an absent parameter, or <code>null</code> all mean populate once and do not attempt to look for new data later. Whenever an poll occurs, the updating system will look for a file with the most recent timestamp and assume that one with the most recent data set, replacing the local cache of the lookup data.</p>
+<p>The <code>namespaceParseSpec</code> can be one of a number of values. Each of the examples below would rename foo to bar, baz to bat, and buck to truck. All parseSpec types assumes each input is delimited by a new line. See below for the types of parseSpec supported.</p>
+<p>Only ONE file which matches the search will be used. For most implementations, the discriminator for choosing the URIs is by whichever one reports the most recent timestamp for its modification time.</p>
+<h4><a class="anchor" aria-hidden="true" id="csv-lookupparsespec"></a><a href="#csv-lookupparsespec" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>csv lookupParseSpec</h4>
+<table>
+<thead>
+<tr><th>Parameter</th><th>Description</th><th>Required</th><th>Default</th></tr>
+</thead>
+<tbody>
+<tr><td><code>columns</code></td><td>The list of columns in the csv file</td><td>no if <code>hasHeaderRow</code> is set</td><td><code>null</code></td></tr>
+<tr><td><code>keyColumn</code></td><td>The name of the column containing the key</td><td>no</td><td>The first column</td></tr>
+<tr><td><code>valueColumn</code></td><td>The name of the column containing the value</td><td>no</td><td>The second column</td></tr>
+<tr><td><code>hasHeaderRow</code></td><td>A flag to indicate that column information can be extracted from the input files' header row</td><td>no</td><td>false</td></tr>
+<tr><td><code>skipHeaderRows</code></td><td>Number of header rows to be skipped</td><td>no</td><td>0</td></tr>
+</tbody>
+</table>
+<p>If both <code>skipHeaderRows</code> and <code>hasHeaderRow</code> options are set, <code>skipHeaderRows</code> is first applied. For example, if you set
+<code>skipHeaderRows</code> to 2 and <code>hasHeaderRow</code> to true, Druid will skip the first two lines and then extract column information
+from the third line.</p>
+<p><em>example input</em></p>
+<pre><code class="hljs"><span class="hljs-keyword">bar,something,foo
+</span><span class="hljs-keyword">bat,something2,baz
+</span><span class="hljs-symbol">truck</span>,something3,<span class="hljs-keyword">buck
+</span></code></pre>
+<p><em>example namespaceParseSpec</em></p>
+<pre><code class="hljs css language-json">"namespaceParseSpec": {
+  "format": "csv",
+  "columns": ["value","somethingElse","key"],
+  "keyColumn": "key",
+  "valueColumn": "value"
+}
+</code></pre>
+<h4><a class="anchor" aria-hidden="true" id="tsv-lookupparsespec"></a><a href="#tsv-lookupparsespec" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>tsv lookupParseSpec</h4>
+<table>
+<thead>
+<tr><th>Parameter</th><th>Description</th><th>Required</th><th>Default</th></tr>
+</thead>
+<tbody>
+<tr><td><code>columns</code></td><td>The list of columns in the tsv file</td><td>yes</td><td><code>null</code></td></tr>
+<tr><td><code>keyColumn</code></td><td>The name of the column containing the key</td><td>no</td><td>The first column</td></tr>
+<tr><td><code>valueColumn</code></td><td>The name of the column containing the value</td><td>no</td><td>The second column</td></tr>
+<tr><td><code>delimiter</code></td><td>The delimiter in the file</td><td>no</td><td>tab (<code>\t</code>)</td></tr>
+<tr><td><code>listDelimiter</code></td><td>The list delimiter in the file</td><td>no</td><td>(<code>\u0001</code>)</td></tr>
+<tr><td><code>hasHeaderRow</code></td><td>A flag to indicate that column information can be extracted from the input files' header row</td><td>no</td><td>false</td></tr>
+<tr><td><code>skipHeaderRows</code></td><td>Number of header rows to be skipped</td><td>no</td><td>0</td></tr>
+</tbody>
+</table>
+<p>If both <code>skipHeaderRows</code> and <code>hasHeaderRow</code> options are set, <code>skipHeaderRows</code> is first applied. For example, if you set
+<code>skipHeaderRows</code> to 2 and <code>hasHeaderRow</code> to true, Druid will skip the first two lines and then extract column information
+from the third line.</p>
+<p><em>example input</em></p>
+<pre><code class="hljs">bar|<span class="hljs-type">something</span>,<span class="hljs-number">1</span>|<span class="hljs-type">foo</span>
+bat|<span class="hljs-type">something</span>,<span class="hljs-number">2</span>|<span class="hljs-type">baz</span>
+truck|<span class="hljs-type">something</span>,<span class="hljs-number">3</span>|<span class="hljs-type">buck</span>
+</code></pre>
+<p><em>example namespaceParseSpec</em></p>
+<pre><code class="hljs css language-json">"namespaceParseSpec": {
+  "format": "tsv",
+  "columns": ["value","somethingElse","key"],
+  "keyColumn": "key",
+  "valueColumn": "value",
+  "delimiter": "|"
+}
+</code></pre>
+<h4><a class="anchor" aria-hidden="true" id="customjson-lookupparsespec"></a><a href="#customjson-lookupparsespec" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>customJson lookupParseSpec</h4>
+<table>
+<thead>
+<tr><th>Parameter</th><th>Description</th><th>Required</th><th>Default</th></tr>
+</thead>
+<tbody>
+<tr><td><code>keyFieldName</code></td><td>The field name of the key</td><td>yes</td><td>null</td></tr>
+<tr><td><code>valueFieldName</code></td><td>The field name of the value</td><td>yes</td><td>null</td></tr>
+</tbody>
+</table>
+<p><em>example input</em></p>
+<pre><code class="hljs css language-json">{<span class="hljs-attr">"key"</span>: <span class="hljs-string">"foo"</span>, <span class="hljs-attr">"value"</span>: <span class="hljs-string">"bar"</span>, <span class="hljs-attr">"somethingElse"</span> : <span class="hljs-string">"something"</span>}
+{<span class="hljs-attr">"key"</span>: <span class="hljs-string">"baz"</span>, <span class="hljs-attr">"value"</span>: <span class="hljs-string">"bat"</span>, <span class="hljs-attr">"somethingElse"</span> : <span class="hljs-string">"something"</span>}
+{<span class="hljs-attr">"key"</span>: <span class="hljs-string">"buck"</span>, <span class="hljs-attr">"somethingElse"</span>: <span class="hljs-string">"something"</span>, <span class="hljs-attr">"value"</span>: <span class="hljs-string">"truck"</span>}
+</code></pre>
+<p><em>example namespaceParseSpec</em></p>
+<pre><code class="hljs css language-json">"namespaceParseSpec": {
+  "format": "customJson",
+  "keyFieldName": "key",
+  "valueFieldName": "value"
+}
+</code></pre>
+<p>With customJson parsing, if the value field for a particular row is missing or null then that line will be skipped, and
+will not be included in the lookup.</p>
+<h4><a class="anchor" aria-hidden="true" id="simplejson-lookupparsespec"></a><a href="#simplejson-lookupparsespec" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>simpleJson lookupParseSpec</h4>
+<p>The <code>simpleJson</code> lookupParseSpec does not take any parameters. It is simply a line delimited JSON file where the field is the key, and the field's value is the value.</p>
+<p><em>example input</em></p>
+<pre><code class="hljs css language-json">{<span class="hljs-attr">"foo"</span>: <span class="hljs-string">"bar"</span>}
+{<span class="hljs-attr">"baz"</span>: <span class="hljs-string">"bat"</span>}
+{<span class="hljs-attr">"buck"</span>: <span class="hljs-string">"truck"</span>}
+</code></pre>
+<p><em>example namespaceParseSpec</em></p>
+<pre><code class="hljs css language-json">"namespaceParseSpec":{
+  "format": "simpleJson"
+}
+</code></pre>
+<h3><a class="anchor" aria-hidden="true" id="jdbc-lookup"></a><a href="#jdbc-lookup" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>JDBC lookup</h3>
+<p>The JDBC lookups will poll a database to populate its local cache. If the <code>tsColumn</code> is set it must be able to accept comparisons in the format <code>'2015-01-01 00:00:00'</code>. For example, the following must be valid SQL for the table <code>SELECT * FROM some_lookup_table WHERE timestamp_column &gt; '2015-01-01 00:00:00'</code>. If <code>tsColumn</code> is set, the caching service will attempt to only poll values that were written <em>after</em> the last sync. If <code>tsColumn</code> is not set, the entire table is pulled every time.</p>
+<table>
+<thead>
+<tr><th>Parameter</th><th>Description</th><th>Required</th><th>Default</th></tr>
+</thead>
+<tbody>
+<tr><td><code>namespace</code></td><td>The namespace to define</td><td>Yes</td><td></td></tr>
+<tr><td><code>connectorConfig</code></td><td>The connector config to use</td><td>Yes</td><td></td></tr>
+<tr><td><code>table</code></td><td>The table which contains the key value pairs</td><td>Yes</td><td></td></tr>
+<tr><td><code>keyColumn</code></td><td>The column in <code>table</code> which contains the keys</td><td>Yes</td><td></td></tr>
+<tr><td><code>valueColumn</code></td><td>The column in <code>table</code> which contains the values</td><td>Yes</td><td></td></tr>
+<tr><td><code>filter</code></td><td>The filter to use when selecting lookups, this is used to create a where clause on lookup population</td><td>No</td><td>No Filter</td></tr>
+<tr><td><code>tsColumn</code></td><td>The column in <code>table</code> which contains when the key was updated</td><td>No</td><td>Not used</td></tr>
+<tr><td><code>pollPeriod</code></td><td>How often to poll the DB</td><td>No</td><td>0 (only once)</td></tr>
+</tbody>
+</table>
+<pre><code class="hljs css language-json">{
+  <span class="hljs-attr">"type"</span>:<span class="hljs-string">"jdbc"</span>,
+  <span class="hljs-attr">"namespace"</span>:<span class="hljs-string">"some_lookup"</span>,
+  <span class="hljs-attr">"connectorConfig"</span>:{
+    <span class="hljs-attr">"createTables"</span>:<span class="hljs-literal">true</span>,
+    <span class="hljs-attr">"connectURI"</span>:<span class="hljs-string">"jdbc:mysql://localhost:3306/druid"</span>,
+    <span class="hljs-attr">"user"</span>:<span class="hljs-string">"druid"</span>,
+    <span class="hljs-attr">"password"</span>:<span class="hljs-string">"diurd"</span>
+  },
+  <span class="hljs-attr">"table"</span>:<span class="hljs-string">"some_lookup_table"</span>,
+  <span class="hljs-attr">"keyColumn"</span>:<span class="hljs-string">"the_old_dim_value"</span>,
+  <span class="hljs-attr">"valueColumn"</span>:<span class="hljs-string">"the_new_dim_value"</span>,
+  <span class="hljs-attr">"tsColumn"</span>:<span class="hljs-string">"timestamp_column"</span>,
+  <span class="hljs-attr">"pollPeriod"</span>:<span class="hljs-number">600000</span>
+}
+</code></pre>
+<blockquote>
+<p>If using JDBC, you will need to add your database's client JAR files to the extension's directory.
+For Postgres, the connector JAR is already included.
+For MySQL, you can get it from <a href="https://dev.mysql.com/downloads/connector/j/">https://dev.mysql.com/downloads/connector/j/</a>.
+Copy or symlink the downloaded file to <code>extensions/druid-lookups-cached-global</code> under the distribution root directory.</p>
+</blockquote>
+<h2><a class="anchor" aria-hidden="true" id="introspection"></a><a href="#introspection" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Introspection</h2>
+<p>Globally cached lookups have introspection points at <code>/keys</code> and <code>/values</code> which return a complete set of the keys and values (respectively) in the lookup. Introspection to <code>/</code> returns the entire map. Introspection to <code>/version</code> returns the version indicator for the lookup.</p>
+</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/0.20.0/development/extensions-core/kafka-extraction-namespace.html"><span class="arrow-prev">← </span><span>Apache Kafka Lookups</span></a><a class="docs-next button" href="/docs/0.20.0/development/extensions-core/mysql.html"><span class="function-name-prevnext">MySQL Metadata Store</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#configuration">Configuration</a></li><li><a href="#example-configuration">Example configuration</a></li><li><a href="#cache-settings">Cache Settings</a></li><li><a href="#supported-lookups">Supported lookups</a><ul class="toc-headings"><li><a href="#uri-lookup">URI lookup</a></li><li><a href="#jdbc-lookup">JDBC lookup</a></li></ul></li><li><a href="#introspection">Introspection</a></li></ul></nav></div><footer class="nav-footer druid-footer" id="footer"><div class="container"><div class="text-center"><p><a href="/technology">Technology</a> · <a href="/use-cases">Use Cases</a> · <a href="/druid-powered">Powered by Druid</a> · <a href="/docs/0.20.0/latest">Docs</a> · <a href="/community/">Community</a> · <a href="/downloads.html">Download</a> · <a href="/faq">FAQ</a></p></div><div class="text-center"><a title="Join the user group" href="https://groups.google.com/forum/#!forum/druid-user" target="_blank"><span class="fa fa-comments"></span></a> · <a title="Follow Druid" href="https://twitter.com/druidio" target="_blank"><span class="fab fa-twitter"></span></a> · <a title="Download via Apache" href="https://www.apache.org/dyn/closer.cgi?path=/incubator/druid/{{ site.druid_versions[0].versions[0].version }}/apache-druid-{{ site.druid_versions[0].versions[0].version }}-bin.tar.gz" target="_blank"><span class="fas fa-feather"></span></a> · <a title="GitHub" href="https://github.com/apache/druid" target="_blank"><span class="fab fa-github"></span></a></div><div class="text-center license">Copyright © 2019 <a href="https://www.apache.org/" target="_blank">Apache Software Foundation</a>.<br/>Except where otherwise noted, licensed under <a rel="license" href="http://creativecommons.org/licenses/by-sa/4.0/">CC BY-SA 4.0</a>.<br/>Apache Druid, Druid, and the Druid logo are either registered trademarks or trademarks of The Apache Software Foundation in the United States and other countries.</div></div></footer></div><script type="text/javascript" src="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.js"></script><script>
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href="/docs/0.20.0/development/extensions-contrib/graphite.html">Graphite Emitter</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-contrib/influx.html">InfluxDB Line Protocol Parser</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-contrib/influxdb-emitter.html">InfluxDB Emitter</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-contrib/kafka-emitter.html">Kafka Emitter</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-contrib/materialized-view.html">Materialized View</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-contrib/momentsketch-quantiles.html">Moment Sketches for Approximate Quantiles module</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-contrib/moving-average-query.html">Moving Average Query</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-contrib/opentsdb-emitter.html">OpenTSDB Emitter</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-contrib/redis-cache.html">Druid Redis Cache</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-contrib/sqlserver.html">Microsoft SQLServer</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-contrib/statsd.html">StatsD Emitter</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-contrib/tdigestsketch-quantiles.html">T-Digest Quantiles Sketch module</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-contrib/thrift.html">Thrift</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-contrib/time-min-max.html">Timestamp Min/Max aggregators</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-contrib/gce-extensions.html">GCE Extensions</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-contrib/aliyun-oss.html">Aliyun OSS</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/querying/hll-old.html">Cardinality/HyperUnique aggregators</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/querying/select-query.html">Select</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/ingestion/standalone-realtime.html">Realtime Process</a></li></ul></div></div></section></div><script>
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+        </script></nav></div><div class="container mainContainer docsContainer"><div class="wrapper"><div class="post"><header class="postHeader"><a class="edit-page-link button" href="https://github.com/apache/druid/edit/master/docs/development/extensions-core/mysql.md" target="_blank" rel="noreferrer noopener">Edit</a><h1 id="__docusaurus" class="postHeaderTitle">MySQL Metadata Store</h1></header><article><div><span><!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+  -->
+<p>To use this Apache Druid extension, make sure to <a href="/docs/0.20.0/development/extensions.html#loading-extensions">include</a> <code>mysql-metadata-storage</code> as an extension.</p>
+<blockquote>
+<p>The MySQL extension requires the MySQL Connector/J library which is not included in the Druid distribution.
+Refer to the following section for instructions on how to install this library.</p>
+</blockquote>
+<h2><a class="anchor" aria-hidden="true" id="installing-the-mysql-connector-library"></a><a href="#installing-the-mysql-connector-library" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Installing the MySQL connector library</h2>
+<p>This extension uses Oracle's MySQL JDBC driver which is not included in the Druid distribution and must be
+installed separately. There are a few ways to obtain this library:</p>
+<ul>
+<li>It can be downloaded from the MySQL site at: <a href="https://dev.mysql.com/downloads/connector/j/">https://dev.mysql.com/downloads/connector/j/</a></li>
+<li>It can be fetched from Maven Central at: <a href="https://repo1.maven.org/maven2/mysql/mysql-connector-java/5.1.48/mysql-connector-java-5.1.48.jar">https://repo1.maven.org/maven2/mysql/mysql-connector-java/5.1.48/mysql-connector-java-5.1.48.jar</a></li>
+<li>It may be available through your package manager, e.g. as <code>libmysql-java</code> on APT for a Debian-based OS</li>
+</ul>
+<p>This should fetch a JAR file named similar to 'mysql-connector-java-x.x.xx.jar'.</p>
+<p>Copy or symlink this file to <code>extensions/mysql-metadata-storage</code> under the distribution root directory.</p>
+<h2><a class="anchor" aria-hidden="true" id="setting-up-mysql"></a><a href="#setting-up-mysql" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Setting up MySQL</h2>
+<ol>
+<li>Install MySQL</li>
+</ol>
+<p>Use your favorite package manager to install mysql, e.g.:</p>
+<ul>
+<li>on Ubuntu/Debian using apt <code>apt-get install mysql-server</code></li>
+<li>on OS X, using <a href="http://brew.sh/">Homebrew</a> <code>brew install mysql</code></li>
+</ul>
+<p>Alternatively, download and follow installation instructions for MySQL
+Community Server here:
+<a href="http://dev.mysql.com/downloads/mysql/">http://dev.mysql.com/downloads/mysql/</a></p>
+<ol start="2">
+<li>Create a druid database and user</li>
+</ol>
+<p>Connect to MySQL from the machine where it is installed.</p>
+<pre><code class="hljs css language-bash">&gt; mysql -u root
+</code></pre>
+<p>Paste the following snippet into the mysql prompt:</p>
+<pre><code class="hljs css language-sql"><span class="hljs-comment">-- create a druid database, make sure to use utf8mb4 as encoding</span>
+<span class="hljs-keyword">CREATE</span> <span class="hljs-keyword">DATABASE</span> druid <span class="hljs-keyword">DEFAULT</span> <span class="hljs-built_in">CHARACTER</span> <span class="hljs-keyword">SET</span> utf8mb4;
+
+<span class="hljs-comment">-- create a druid user</span>
+<span class="hljs-keyword">CREATE</span> <span class="hljs-keyword">USER</span> <span class="hljs-string">'druid'</span>@<span class="hljs-string">'localhost'</span> <span class="hljs-keyword">IDENTIFIED</span> <span class="hljs-keyword">BY</span> <span class="hljs-string">'diurd'</span>;
+
+<span class="hljs-comment">-- grant the user all the permissions on the database we just created</span>
+<span class="hljs-keyword">GRANT</span> <span class="hljs-keyword">ALL</span> <span class="hljs-keyword">PRIVILEGES</span> <span class="hljs-keyword">ON</span> druid.* <span class="hljs-keyword">TO</span> <span class="hljs-string">'druid'</span>@<span class="hljs-string">'localhost'</span>;
+</code></pre>
+<ol start="3">
+<li>Configure your Druid metadata storage extension:</li>
+</ol>
+<p>Add the following parameters to your Druid configuration, replacing <code>&lt;host&gt;</code>
+with the location (host name and port) of the database.</p>
+<pre><code class="hljs css language-properties"><span class="hljs-meta">druid.extensions.loadList</span>=<span class="hljs-string">["mysql-metadata-storage"]</span>
+<span class="hljs-meta">druid.metadata.storage.type</span>=<span class="hljs-string">mysql</span>
+<span class="hljs-meta">druid.metadata.storage.connector.connectURI</span>=<span class="hljs-string">jdbc:mysql://&lt;host&gt;/druid</span>
+<span class="hljs-meta">druid.metadata.storage.connector.user</span>=<span class="hljs-string">druid</span>
+<span class="hljs-meta">druid.metadata.storage.connector.password</span>=<span class="hljs-string">diurd</span>
+</code></pre>
+<h2><a class="anchor" aria-hidden="true" id="encrypting-mysql-connections"></a><a href="#encrypting-mysql-connections" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Encrypting MySQL connections</h2>
+<p>This extension provides support for encrypting MySQL connections. To get more information about encrypting MySQL connections using TLS/SSL in general, please refer to this <a href="https://dev.mysql.com/doc/refman/5.7/en/using-encrypted-connections.html">guide</a>.</p>
+<h2><a class="anchor" aria-hidden="true" id="configuration"></a><a href="#configuration" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Configuration</h2>
+<table>
+<thead>
+<tr><th>Property</th><th>Description</th><th>Default</th><th>Required</th></tr>
+</thead>
+<tbody>
+<tr><td><code>druid.metadata.mysql.ssl.useSSL</code></td><td>Enable SSL</td><td><code>false</code></td><td>no</td></tr>
+<tr><td><code>druid.metadata.mysql.ssl.clientCertificateKeyStoreUrl</code></td><td>The file path URL to the client certificate key store.</td><td>none</td><td>no</td></tr>
+<tr><td><code>druid.metadata.mysql.ssl.clientCertificateKeyStoreType</code></td><td>The type of the key store where the client certificate is stored.</td><td>none</td><td>no</td></tr>
+<tr><td><code>druid.metadata.mysql.ssl.clientCertificateKeyStorePassword</code></td><td>The <a href="/docs/0.20.0/operations/password-provider.html">Password Provider</a> or String password for the client key store.</td><td>none</td><td>no</td></tr>
+<tr><td><code>druid.metadata.mysql.ssl.verifyServerCertificate</code></td><td>Enables server certificate verification.</td><td>false</td><td>no</td></tr>
+<tr><td><code>druid.metadata.mysql.ssl.trustCertificateKeyStoreUrl</code></td><td>The file path to the trusted root certificate key store.</td><td>Default trust store provided by MySQL</td><td>yes if <code>verifyServerCertificate</code> is set to true and a custom trust store is used</td></tr>
+<tr><td><code>druid.metadata.mysql.ssl.trustCertificateKeyStoreType</code></td><td>The type of the key store where trusted root certificates are stored.</td><td>JKS</td><td>yes if <code>verifyServerCertificate</code> is set to true and keystore type is not JKS</td></tr>
+<tr><td><code>druid.metadata.mysql.ssl.trustCertificateKeyStorePassword</code></td><td>The <a href="/docs/0.20.0/operations/password-provider.html">Password Provider</a> or String password for the trust store.</td><td>none</td><td>yes if <code>verifyServerCertificate</code> is set to true and password is not null</td></tr>
+<tr><td><code>druid.metadata.mysql.ssl.enabledSSLCipherSuites</code></td><td>Overrides the existing cipher suites with these cipher suites.</td><td>none</td><td>no</td></tr>
+<tr><td><code>druid.metadata.mysql.ssl.enabledTLSProtocols</code></td><td>Overrides the TLS protocols with these protocols.</td><td>none</td><td>no</td></tr>
+</tbody>
+</table>
+<h3><a class="anchor" aria-hidden="true" id="mysql-firehose"></a><a href="#mysql-firehose" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>MySQL Firehose</h3>
+<p>The MySQL extension provides an implementation of an <a href="/docs/0.20.0/ingestion/native-batch.html#firehoses-deprecated">SqlFirehose</a> which can be used to ingest data into Druid from a MySQL database.</p>
+<pre><code class="hljs css language-json">{
+  <span class="hljs-attr">"type"</span>: <span class="hljs-string">"index_parallel"</span>,
+  <span class="hljs-attr">"spec"</span>: {
+    <span class="hljs-attr">"dataSchema"</span>: {
+      <span class="hljs-attr">"dataSource"</span>: <span class="hljs-string">"some_datasource"</span>,
+      <span class="hljs-attr">"parser"</span>: {
+        <span class="hljs-attr">"parseSpec"</span>: {
+          <span class="hljs-attr">"format"</span>: <span class="hljs-string">"timeAndDims"</span>,
+          <span class="hljs-attr">"dimensionsSpec"</span>: {
+            <span class="hljs-attr">"dimensionExclusions"</span>: [],
+            <span class="hljs-attr">"dimensions"</span>: [
+              <span class="hljs-string">"dim1"</span>,
+              <span class="hljs-string">"dim2"</span>,
+              <span class="hljs-string">"dim3"</span>
+            ]
+          },
+          <span class="hljs-attr">"timestampSpec"</span>: {
+            <span class="hljs-attr">"format"</span>: <span class="hljs-string">"auto"</span>,
+            <span class="hljs-attr">"column"</span>: <span class="hljs-string">"ts"</span>
+          }
+        }
+      },
+      <span class="hljs-attr">"metricsSpec"</span>: [],
+      <span class="hljs-attr">"granularitySpec"</span>: {
+        <span class="hljs-attr">"type"</span>: <span class="hljs-string">"uniform"</span>,
+        <span class="hljs-attr">"segmentGranularity"</span>: <span class="hljs-string">"DAY"</span>,
+        <span class="hljs-attr">"queryGranularity"</span>: {
+          <span class="hljs-attr">"type"</span>: <span class="hljs-string">"none"</span>
+        },
+        <span class="hljs-attr">"rollup"</span>: <span class="hljs-literal">false</span>,
+        <span class="hljs-attr">"intervals"</span>: <span class="hljs-literal">null</span>
+      },
+      <span class="hljs-attr">"transformSpec"</span>: {
+        <span class="hljs-attr">"filter"</span>: <span class="hljs-literal">null</span>,
+        <span class="hljs-attr">"transforms"</span>: []
+      }
+    },
+    <span class="hljs-attr">"ioConfig"</span>: {
+      <span class="hljs-attr">"type"</span>: <span class="hljs-string">"index_parallel"</span>,
+      <span class="hljs-attr">"firehose"</span>: {
+        <span class="hljs-attr">"type"</span>: <span class="hljs-string">"sql"</span>,
+        <span class="hljs-attr">"database"</span>: {
+          <span class="hljs-attr">"type"</span>: <span class="hljs-string">"mysql"</span>,
+          <span class="hljs-attr">"connectorConfig"</span>: {
+            <span class="hljs-attr">"connectURI"</span>: <span class="hljs-string">"jdbc:mysql://some-rds-host.us-west-1.rds.amazonaws.com:3306/druid"</span>,
+            <span class="hljs-attr">"user"</span>: <span class="hljs-string">"admin"</span>,
+            <span class="hljs-attr">"password"</span>: <span class="hljs-string">"secret"</span>
+          }
+        },
+        <span class="hljs-attr">"sqls"</span>: [
+          <span class="hljs-string">"SELECT * FROM some_table"</span>
+        ]
+      }
+    },
+    <span class="hljs-attr">"tuningconfig"</span>: {
+      <span class="hljs-attr">"type"</span>: <span class="hljs-string">"index_parallel"</span>
+    }
+  }
+}
+</code></pre>
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new file mode 100644
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+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
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+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
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+  -->
+<h2><a class="anchor" aria-hidden="true" id="orc-extension"></a><a href="#orc-extension" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>ORC extension</h2>
+<p>This Apache Druid extension enables Druid to ingest and understand the Apache ORC data format.</p>
+<p>The extension provides the <a href="/docs/0.20.0/ingestion/data-formats.html#orc">ORC input format</a> and the <a href="/docs/0.20.0/ingestion/data-formats.html#orc-hadoop-parser">ORC Hadoop parser</a>
+for <a href="/docs/0.20.0/ingestion/native-batch.html">native batch ingestion</a> and <a href="/docs/0.20.0/ingestion/hadoop.html">Hadoop batch ingestion</a>, respectively.
+Please see corresponding docs for details.</p>
+<p>To use this extension, make sure to <a href="/docs/0.20.0/development/extensions.html#loading-extensions">include</a> <code>druid-orc-extensions</code>.</p>
+<h3><a class="anchor" aria-hidden="true" id="migration-from-contrib-extension"></a><a href="#migration-from-contrib-extension" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Migration from 'contrib' extension</h3>
+<p>This extension, first available in version 0.15.0, replaces the previous 'contrib' extension which was available until
+0.14.0-incubating. While this extension can index any data the 'contrib' extension could, the JSON spec for the
+ingestion task is <em>incompatible</em>, and will need modified to work with the newer 'core' extension.</p>
+<p>To migrate to 0.15.0+:</p>
+<ul>
+<li>In <code>inputSpec</code> of <code>ioConfig</code>, <code>inputFormat</code> must be changed from <code>&quot;org.apache.hadoop.hive.ql.io.orc.OrcNewInputFormat&quot;</code> to
+<code>&quot;org.apache.orc.mapreduce.OrcInputFormat&quot;</code></li>
+<li>The 'contrib' extension supported a <code>typeString</code> property, which provided the schema of the
+ORC file, of which was essentially required to have the types correct, but notably <em>not</em> the column names, which
+facilitated column renaming. In the 'core' extension, column renaming can be achieved with
+<a href="/docs/0.20.0/ingestion/index.html#flattenspec"><code>flattenSpec</code></a>. For example, <code>&quot;typeString&quot;:&quot;struct&lt;time:string,name:string&gt;&quot;</code>
+with the actual schema <code>struct&lt;_col0:string,_col1:string&gt;</code>, to preserve Druid schema would need replaced with:</li>
+</ul>
+<pre><code class="hljs css language-json">"flattenSpec": {
+  "fields": [
+    {
+      "type": "path",
+      "name": "time",
+      "expr": "$._col0"
+    },
+    {
+      "type": "path",
+      "name": "name",
+      "expr": "$._col1"
+    }
+  ]
+  ...
+}
+</code></pre>
+<ul>
+<li>The 'contrib' extension supported a <code>mapFieldNameFormat</code> property, which provided a way to specify a dimension to
+flatten <code>OrcMap</code> columns with primitive types. This functionality has also been replaced with
+<a href="/docs/0.20.0/ingestion/index.html#flattenspec"><code>flattenSpec</code></a>. For example: <code>&quot;mapFieldNameFormat&quot;: &quot;&lt;PARENT&gt;_&lt;CHILD&gt;&quot;</code>
+for a dimension <code>nestedData_dim1</code>, to preserve Druid schema could be replaced with</li>
+</ul>
+<pre><code class="hljs css language-json">"flattenSpec": {
+ "fields": [
+   {
+     "type": "path",
+     "name": "nestedData_dim1",
+     "expr": "$.nestedData.dim1"
+   }
+ ]
+ ...
+}
+</code></pre>
+</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/0.20.0/development/extensions-core/mysql.html"><span class="arrow-prev">← </span><span class="function-name-prevnext">MySQL Metadata Store</span></a><a class="docs-next button" href="/docs/0.20.0/development/extensions-core/druid-pac4j.html"><span>Druid pac4j based Security extension</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#orc-extension">ORC extension</a><ul class="toc-headings"><li><a href="#migration-from-contrib-extension">Migration from 'contrib' extension</a></li></ul></li></ul></nav></div><footer class="nav-footer druid-footer" id="footer"><div class="container"><div class="text-center"><p><a href="/technology">Technology</a> · <a href="/use-cases">Use Cases</a> · <a href="/druid-powered">Powered by Druid</a> · <a href="/docs/0.20.0/latest">Docs</a> · <a href="/community/">Community</a> · <a href="/downloads.html">Download</a> · <a href="/faq">FAQ</a></p></div><div class="text-center"><a title="Join the user group" href="https://groups.google.com/forum/#!forum/druid-user" target="_blank"><span class="fa fa-comments"></span></a> · <a title="Follow Druid" href="https://twitter.com/druidio" target="_blank"><span class="fab fa-twitter"></span></a> · <a title="Download via Apache" href="https://www.apache.org/dyn/closer.cgi?path=/incubator/druid/{{ site.druid_versions[0].versions[0].version }}/apache-druid-{{ site.druid_versions[0].versions[0].version }}-bin.tar.gz" target="_blank"><span class="fas fa-feather"></span></a> · <a title="GitHub" href="https://github.com/apache/druid" target="_blank"><span class="fab fa-github"></span></a></div><div class="text-center license">Copyright © 2019 <a href="https://www.apache.org/" target="_blank">Apache Software Foundation</a>.<br/>Except where otherwise noted, licensed under <a rel="license" href="http://creativecommons.org/licenses/by-sa/4.0/">CC BY-SA 4.0</a>.<br/>Apache Druid, Druid, and the Druid logo are either registered trademarks or trademarks of The Apache Software Foundation in the United States and other countries.</div></div></footer></div><script type="text/javascript" src="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.js"></script><script>
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+        </script></nav></div><div class="container mainContainer docsContainer"><div class="wrapper"><div class="post"><header class="postHeader"><a class="edit-page-link button" href="https://github.com/apache/druid/edit/master/docs/development/extensions-core/parquet.md" target="_blank" rel="noreferrer noopener">Edit</a><h1 id="__docusaurus" class="postHeaderTitle">Apache Parquet Extension</h1></header><article><div><span><!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
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+<p>This Apache Druid module extends <a href="/docs/0.20.0/ingestion/hadoop.html">Druid Hadoop based indexing</a> to ingest data directly from offline
+Apache Parquet files.</p>
+<p>Note: If using the <code>parquet-avro</code> parser for Apache Hadoop based indexing, <code>druid-parquet-extensions</code> depends on the <code>druid-avro-extensions</code> module, so be sure to
+<a href="/docs/0.20.0/development/extensions.html#loading-extensions">include  both</a>.</p>
+<p>The <code>druid-parquet-extensions</code> provides the <a href="/docs/0.20.0/ingestion/data-formats.html#parquet">Parquet input format</a>, the <a href="/docs/0.20.0/ingestion/data-formats.html#parquet-hadoop-parser">Parquet Hadoop parser</a>,
+and the <a href="/docs/0.20.0/ingestion/data-formats.html#parquet-avro-hadoop-parser">Parquet Avro Hadoop Parser</a> with <code>druid-avro-extensions</code>.
+The Parquet input format is available for <a href="/docs/0.20.0/ingestion/native-batch.html">native batch ingestion</a>
+and the other 2 parsers are for <a href="/docs/0.20.0/ingestion/hadoop.html">Hadoop batch ingestion</a>.
+Please see corresponding docs for details.</p>
+</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/0.20.0/development/extensions-core/druid-pac4j.html"><span class="arrow-prev">← </span><span>Druid pac4j based Security extension</span></a><a class="docs-next button" href="/docs/0.20.0/development/extensions-core/postgresql.html"><span class="function-name-prevnext">PostgreSQL Metadata Store</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"></nav></div><footer class="nav-footer druid-footer" id="footer"><div class="container"><div class="text-center"><p><a href="/technology">Technology</a> · <a href="/use-cases">Use Cases</a> · <a href="/druid-powered">Powered by Druid</a> · <a href="/docs/0.20.0/latest">Docs</a> · <a href="/community/">Community</a> · <a href="/downloads.html">Download</a> · <a href="/faq">FAQ</a></p></div><div class="text-center"><a title="Join the user group" href="https://groups.google.com/forum/#!forum/druid-user" target="_blank"><span class="fa fa-comments"></span></a> · <a title="Follow Druid" href="https://twitter.com/druidio" target="_blank"><span class="fab fa-twitter"></span></a> · <a title="Download via Apache" href="https://www.apache.org/dyn/closer.cgi?path=/incubator/druid/{{ site.druid_versions[0].versions[0].version }}/apache-druid-{{ site.druid_versions[0].versions[0].version }}-bin.tar.gz" target="_blank"><span class="fas fa-feather"></span></a> · <a title="GitHub" href="https://github.com/apache/druid" target="_blank"><span class="fab fa-github"></span></a></div><div class="text-center license">Copyright © 2019 <a href="https://www.apache.org/" target="_blank">Apache Software Foundation</a>.<br/>Except where otherwise noted, licensed under <a rel="license" href="http://creativecommons.org/licenses/by-sa/4.0/">CC BY-SA 4.0</a>.<br/>Apache Druid, Druid, and the Druid logo are either registered trademarks or trademarks of The Apache Software Foundation in the United States and other countries.</div></div></footer></div><script type="text/javascript" src="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.js"></script><script>
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@@ -0,0 +1,216 @@
+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>PostgreSQL Metadata Store · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/0.20.0/development/extensions-core/postgresql.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.20.0" /><meta property="og:title" content="PostgreSQL Metadata Store · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
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+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
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+  ~
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+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+  -->
+<p>To use this Apache Druid extension, make sure to <a href="/docs/0.20.0/development/extensions.html#loading-extensions">include</a> <code>postgresql-metadata-storage</code> as an extension.</p>
+<h2><a class="anchor" aria-hidden="true" id="setting-up-postgresql"></a><a href="#setting-up-postgresql" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Setting up PostgreSQL</h2>
+<ol>
+<li>Install PostgreSQL</li>
+</ol>
+<p>Use your favorite package manager to install PostgreSQL, e.g.:</p>
+<ul>
+<li>on Ubuntu/Debian using apt <code>apt-get install postgresql</code></li>
+<li>on OS X, using <a href="http://brew.sh/">Homebrew</a> <code>brew install postgresql</code></li>
+</ul>
+<ol start="2">
+<li>Create a druid database and user</li>
+</ol>
+<p>On the machine where PostgreSQL is installed, using an account with proper
+postgresql permissions:</p>
+<p>Create a druid user, enter <code>diurd</code> when prompted for the password.</p>
+<pre><code class="hljs css language-bash">createuser druid -P
+</code></pre>
+<p>Create a druid database owned by the user we just created</p>
+<pre><code class="hljs css language-bash">createdb druid -O druid
+</code></pre>
+<p><em>Note:</em> On Ubuntu / Debian you may have to prefix the <code>createuser</code> and
+<code>createdb</code> commands with <code>sudo -u postgres</code> in order to gain proper
+permissions.</p>
+<ol start="3">
+<li>Configure your Druid metadata storage extension:</li>
+</ol>
+<p>Add the following parameters to your Druid configuration, replacing <code>&lt;host&gt;</code>
+with the location (host name and port) of the database.</p>
+<pre><code class="hljs css language-properties"><span class="hljs-meta">druid.extensions.loadList</span>=<span class="hljs-string">["postgresql-metadata-storage"]</span>
+<span class="hljs-meta">druid.metadata.storage.type</span>=<span class="hljs-string">postgresql</span>
+<span class="hljs-meta">druid.metadata.storage.connector.connectURI</span>=<span class="hljs-string">jdbc:postgresql://&lt;host&gt;/druid</span>
+<span class="hljs-meta">druid.metadata.storage.connector.user</span>=<span class="hljs-string">druid</span>
+<span class="hljs-meta">druid.metadata.storage.connector.password</span>=<span class="hljs-string">diurd</span>
+</code></pre>
+<h2><a class="anchor" aria-hidden="true" id="configuration"></a><a href="#configuration" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Configuration</h2>
+<p>In most cases, the configuration options map directly to the <a href="https://jdbc.postgresql.org/documentation/head/connect.html">postgres JDBC connection options</a>.</p>
+<table>
+<thead>
+<tr><th>Property</th><th>Description</th><th>Default</th><th>Required</th></tr>
+</thead>
+<tbody>
+<tr><td><code>druid.metadata.postgres.ssl.useSSL</code></td><td>Enables SSL</td><td><code>false</code></td><td>no</td></tr>
+<tr><td><code>druid.metadata.postgres.ssl.sslPassword</code></td><td>The <a href="/docs/0.20.0/operations/password-provider.html">Password Provider</a> or String password for the client's key.</td><td>none</td><td>no</td></tr>
+<tr><td><code>druid.metadata.postgres.ssl.sslFactory</code></td><td>The class name to use as the <code>SSLSocketFactory</code></td><td>none</td><td>no</td></tr>
+<tr><td><code>druid.metadata.postgres.ssl.sslFactoryArg</code></td><td>An optional argument passed to the sslFactory's constructor</td><td>none</td><td>no</td></tr>
+<tr><td><code>druid.metadata.postgres.ssl.sslMode</code></td><td>The sslMode. Possible values are &quot;disable&quot;, &quot;require&quot;, &quot;verify-ca&quot;, &quot;verify-full&quot;, &quot;allow&quot; and &quot;prefer&quot;</td><td>none</td><td>no</td></tr>
+<tr><td><code>druid.metadata.postgres.ssl.sslCert</code></td><td>The full path to the certificate file.</td><td>none</td><td>no</td></tr>
+<tr><td><code>druid.metadata.postgres.ssl.sslKey</code></td><td>The full path to the key file.</td><td>none</td><td>no</td></tr>
+<tr><td><code>druid.metadata.postgres.ssl.sslRootCert</code></td><td>The full path to the root certificate.</td><td>none</td><td>no</td></tr>
+<tr><td><code>druid.metadata.postgres.ssl.sslHostNameVerifier</code></td><td>The classname of the hostname verifier.</td><td>none</td><td>no</td></tr>
+<tr><td><code>druid.metadata.postgres.ssl.sslPasswordCallback</code></td><td>The classname of the SSL password provider.</td><td>none</td><td>no</td></tr>
+<tr><td><code>druid.metadata.postgres.dbTableSchema</code></td><td>druid meta table schema</td><td><code>public</code></td><td>no</td></tr>
+</tbody>
+</table>
+<h3><a class="anchor" aria-hidden="true" id="postgresql-firehose"></a><a href="#postgresql-firehose" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>PostgreSQL Firehose</h3>
+<p>The PostgreSQL extension provides an implementation of an <a href="/docs/0.20.0/ingestion/native-batch.html#firehoses-deprecated">SqlFirehose</a> which can be used to ingest data into Druid from a PostgreSQL database.</p>
+<pre><code class="hljs css language-json">{
+  <span class="hljs-attr">"type"</span>: <span class="hljs-string">"index_parallel"</span>,
+  <span class="hljs-attr">"spec"</span>: {
+    <span class="hljs-attr">"dataSchema"</span>: {
+      <span class="hljs-attr">"dataSource"</span>: <span class="hljs-string">"some_datasource"</span>,
+      <span class="hljs-attr">"parser"</span>: {
+        <span class="hljs-attr">"parseSpec"</span>: {
+          <span class="hljs-attr">"format"</span>: <span class="hljs-string">"timeAndDims"</span>,
+          <span class="hljs-attr">"dimensionsSpec"</span>: {
+            <span class="hljs-attr">"dimensionExclusions"</span>: [],
+            <span class="hljs-attr">"dimensions"</span>: [
+              <span class="hljs-string">"dim1"</span>,
+              <span class="hljs-string">"dim2"</span>,
+              <span class="hljs-string">"dim3"</span>
+            ]
+          },
+          <span class="hljs-attr">"timestampSpec"</span>: {
+            <span class="hljs-attr">"format"</span>: <span class="hljs-string">"auto"</span>,
+            <span class="hljs-attr">"column"</span>: <span class="hljs-string">"ts"</span>
+          }
+        }
+      },
+      <span class="hljs-attr">"metricsSpec"</span>: [],
+      <span class="hljs-attr">"granularitySpec"</span>: {
+        <span class="hljs-attr">"type"</span>: <span class="hljs-string">"uniform"</span>,
+        <span class="hljs-attr">"segmentGranularity"</span>: <span class="hljs-string">"DAY"</span>,
+        <span class="hljs-attr">"queryGranularity"</span>: {
+          <span class="hljs-attr">"type"</span>: <span class="hljs-string">"none"</span>
+        },
+        <span class="hljs-attr">"rollup"</span>: <span class="hljs-literal">false</span>,
+        <span class="hljs-attr">"intervals"</span>: <span class="hljs-literal">null</span>
+      },
+      <span class="hljs-attr">"transformSpec"</span>: {
+        <span class="hljs-attr">"filter"</span>: <span class="hljs-literal">null</span>,
+        <span class="hljs-attr">"transforms"</span>: []
+      }
+    },
+    <span class="hljs-attr">"ioConfig"</span>: {
+      <span class="hljs-attr">"type"</span>: <span class="hljs-string">"index_parallel"</span>,
+      <span class="hljs-attr">"firehose"</span>: {
+        <span class="hljs-attr">"type"</span>: <span class="hljs-string">"sql"</span>,
+        <span class="hljs-attr">"database"</span>: {
+          <span class="hljs-attr">"type"</span>: <span class="hljs-string">"postgresql"</span>,
+          <span class="hljs-attr">"connectorConfig"</span>: {
+            <span class="hljs-attr">"connectURI"</span>: <span class="hljs-string">"jdbc:postgresql://some-rds-host.us-west-1.rds.amazonaws.com:5432/druid"</span>,
+            <span class="hljs-attr">"user"</span>: <span class="hljs-string">"admin"</span>,
+            <span class="hljs-attr">"password"</span>: <span class="hljs-string">"secret"</span>
+          }
+        },
+        <span class="hljs-attr">"sqls"</span>: [
+          <span class="hljs-string">"SELECT * FROM some_table"</span>
+        ]
+      }
+    },
+    <span class="hljs-attr">"tuningconfig"</span>: {
+      <span class="hljs-attr">"type"</span>: <span class="hljs-string">"index_parallel"</span>
+    }
+  }
+}
+</code></pre>
+</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/0.20.0/development/extensions-core/parquet.html"><span class="arrow-prev">← </span><span>Apache Parquet Extension</span></a><a class="docs-next button" href="/docs/0.20.0/development/extensions-core/protobuf.html"><span>Protobuf</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#setting-up-postgresql">Setting up PostgreSQL</a></li><li><a href="#configuration">Configuration</a><ul class="toc-headings"><li><a href="#postgresql-firehose">PostgreSQL Firehose</a></li></ul></li></ul></nav></div><footer class="nav-footer druid-footer" id="footer"><div class="container"><div class="text-center"><p><a href="/technology">Technology</a> · <a href="/use-cases">Use Cases</a> · <a href="/druid-powered">Powered by Druid</a> · <a href="/docs/0.20.0/latest">Docs</a> · <a href="/community/">Community</a> · <a href="/downloads.html">Download</a> · <a href="/faq">FAQ</a></p></div><div class="text-center"><a title="Join the user group" href="https://groups.google.com/forum/#!forum/druid-user" target="_blank"><span class="fa fa-comments"></span></a> · <a title="Follow Druid" href="https://twitter.com/druidio" target="_blank"><span class="fab fa-twitter"></span></a> · <a title="Download via Apache" href="https://www.apache.org/dyn/closer.cgi?path=/incubator/druid/{{ site.druid_versions[0].versions[0].version }}/apache-druid-{{ site.druid_versions[0].versions[0].version }}-bin.tar.gz" target="_blank"><span class="fas fa-feather"></span></a> · <a title="GitHub" href="https://github.com/apache/druid" target="_blank"><span class="fab fa-github"></span></a></div><div class="text-center license">Copyright © 2019 <a href="https://www.apache.org/" target="_blank">Apache Software Foundation</a>.<br/>Except where otherwise noted, licensed under <a rel="license" href="http://creativecommons.org/licenses/by-sa/4.0/">CC BY-SA 4.0</a>.<br/>Apache Druid, Druid, and the Druid logo are either registered trademarks or trademarks of The Apache Software Foundation in the United States and other countries.</div></div></footer></div><script type="text/javascript" src="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.js"></script><script>
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+              </script><script>
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\ No newline at end of file
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new file mode 100644
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+++ b/docs/0.20.0/development/extensions-core/protobuf.html
@@ -0,0 +1,270 @@
+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Protobuf · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/0.20.0/development/extensions-core/protobuf.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.20.0" /><meta property="og:title" content="Protobuf · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
+              window.dataLayer = window.dataLayer || [];
+              function gtag(){dataLayer.push(arguments); }
+              gtag('js', new Date());
+              gtag('config', 'UA-131010415-1');
+            </script><link rel="stylesheet" href="https://use.fontawesome.com/releases/v5.7.2/css/all.css"/><link rel="stylesheet" href="/css/code-block-buttons.css"/><script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/clipboard.js/2.0.4/clipboard.min.js"></script><script type="text/javascript" src="/js/code-block-buttons.js"></script><script src="/js/scrollSpy.js"></script><link rel="stylesheet" href="/css/main.css"/><script src="/js/codetabs.js"></script></head><body class="sideNavVisible separateOnPageNav"><div class="fixedHeaderContainer"><div class="headerWrapper wrapper"><header><a href="/"><img class="logo" src="/img/druid_nav.png" alt="Apache Druid"/></a><div class="navigationWrapper navigationSlider"><nav class="slidingNav"><ul class="nav-site nav-site-internal"><li class=""><a href="/technology" target="_self">Technology</a></li><li class=""><a href="/use-cases" target="_self">Use Cases</a></li><li class=""><a href="/druid-powered" 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collapsible">Tutorials<span class="arrow"><svg width="24" height="24" viewBox="0 0 24 24"><path fill="#565656" d="M7.41 15.41L12 10.83l4.59 4.58L18 14l-6-6-6 6z"></path><path d="M0 0h24v24H0z" fill="none"></path></svg></span></h3><ul class="hide"><li class="navListItem"><a class="navItem" href="/docs/0.20.0/tutorials/tutorial-batch.html">Loading files natively</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/tutorials/tutorial-kafka.html">Load from Apache Kafka</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/tutorials/tutorial-batch-hadoop.html">Load from Apache Hadoop</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/tutorials/tutorial-query.html">Querying data</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/tutorials/tutorial-rollup.html">Roll-up</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/tutorials/tutorial-retention.html">Configuring data retention</a></li><li 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href="/docs/0.20.0/ingestion/tranquility.html">Tranquility</a></li></ul></div><div class="navGroup subNavGroup"><h4 class="navGroupSubcategoryTitle">Batch ingestion</h4><ul><li class="navListItem"><a class="navItem" href="/docs/0.20.0/ingestion/native-batch.html">Native batch</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/ingestion/hadoop.html">Hadoop-based</a></li></ul></div><li class="navListItem"><a class="navItem" href="/docs/0.20.0/ingestion/tasks.html">Task reference</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/ingestion/faq.html">Troubleshooting FAQ</a></li></ul></div><div class="navGroup"><h3 class="navGroupCategoryTitle collapsible">Querying<span class="arrow"><svg width="24" height="24" viewBox="0 0 24 24"><path fill="#565656" d="M7.41 15.41L12 10.83l4.59 4.58L18 14l-6-6-6 6z"></path><path d="M0 0h24v24H0z" fill="none"></path></svg></span></h3><ul class="hide"><li class="navListItem"><a class="navItem" href="/docs/0.20.0/querying/sql.html">Druid SQL</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/querying/querying.html">Native queries</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/querying/query-execution.html">Query execution</a></li><div class="navGroup subNavGroup"><h4 class="navGroupSubcategoryTitle">Concepts</h4><ul><li class="navListItem"><a class="navItem" href="/docs/0.20.0/querying/datasource.html">Datasources</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/querying/joins.html">Joins</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/querying/lookups.html">Lookups</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/querying/multi-value-dimensions.html">Multi-value dimensions</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/querying/multitenancy.html">Multitenancy</a></li><li class="navListItem"><a class="navItem" 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+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
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+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
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+  -->
+<p>This Apache Druid extension enables Druid to ingest and understand the Protobuf data format. Make sure to <a href="/docs/0.20.0/development/extensions.html#loading-extensions">include</a> <code>druid-protobuf-extensions</code> as an extension.</p>
+<p>The <code>druid-protobuf-extensions</code> provides the <a href="/docs/0.20.0/ingestion/data-formats.html#protobuf-parser">Protobuf Parser</a>
+for <a href="/docs/0.20.0/ingestion/index.html#streaming">stream ingestion</a>. See corresponding docs for details.</p>
+<h2><a class="anchor" aria-hidden="true" id="example-load-protobuf-messages-from-kafka"></a><a href="#example-load-protobuf-messages-from-kafka" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Example: Load Protobuf messages from Kafka</h2>
+<p>This example demonstrates how to load Protobuf messages from Kafka.  Please read the <a href="/docs/0.20.0/tutorials/tutorial-kafka.html">Load from Kafka tutorial</a> first, and see <a href="/docs/0.20.0/development/extensions-core/kafka-ingestion.html">Kafka Indexing Service</a> documentation for more details.</p>
+<p>The files used in this example are found at <a href="https://github.com/apache/druid/tree/master/examples/quickstart/protobuf"><code>./examples/quickstart/protobuf</code> in your Druid directory</a>.</p>
+<p>For this example:</p>
+<ul>
+<li>Kafka broker host is <code>localhost:9092</code></li>
+<li>Kafka topic is <code>metrics_pb</code></li>
+<li>Datasource name is <code>metrics-protobuf</code></li>
+</ul>
+<p>Here is a JSON example of the 'metrics' data schema used in the example.</p>
+<pre><code class="hljs css language-json">{
+  <span class="hljs-attr">"unit"</span>: <span class="hljs-string">"milliseconds"</span>,
+  <span class="hljs-attr">"http_method"</span>: <span class="hljs-string">"GET"</span>,
+  <span class="hljs-attr">"value"</span>: <span class="hljs-number">44</span>,
+  <span class="hljs-attr">"timestamp"</span>: <span class="hljs-string">"2017-04-06T02:36:22Z"</span>,
+  <span class="hljs-attr">"http_code"</span>: <span class="hljs-string">"200"</span>,
+  <span class="hljs-attr">"page"</span>: <span class="hljs-string">"/"</span>,
+  <span class="hljs-attr">"metricType"</span>: <span class="hljs-string">"request/latency"</span>,
+  <span class="hljs-attr">"server"</span>: <span class="hljs-string">"www1.example.com"</span>
+}
+</code></pre>
+<h3><a class="anchor" aria-hidden="true" id="proto-file"></a><a href="#proto-file" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Proto file</h3>
+<p>The corresponding proto file for our 'metrics' dataset looks like this.</p>
+<pre><code class="hljs">syntax = <span class="hljs-string">"proto3"</span>;
+message Metrics {
+  string unit = 1;
+  string http_method = 2;
+  int32 value = 3;
+  string timestamp = 4;
+  string http_code = 5;
+  string<span class="hljs-built_in"> page </span>= 6;
+  string metricType = 7;
+  string<span class="hljs-built_in"> server </span>= 8;
+}
+</code></pre>
+<h3><a class="anchor" aria-hidden="true" id="descriptor-file"></a><a href="#descriptor-file" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Descriptor file</h3>
+<p>Next, we use the <code>protoc</code> Protobuf compiler to generate the descriptor file and save it as <code>metrics.desc</code>. The descriptor file must be either in the classpath or reachable by URL.  In this example the descriptor file was saved at <code>/tmp/metrics.desc</code>, however this file is also available in the example files. From your Druid install directory:</p>
+<pre><code class="hljs">protoc -o <span class="hljs-meta-keyword">/tmp/</span>metrics.desc .<span class="hljs-meta-keyword">/quickstart/</span>protobuf/metrics.proto
+</code></pre>
+<h2><a class="anchor" aria-hidden="true" id="create-kafka-supervisor"></a><a href="#create-kafka-supervisor" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Create Kafka Supervisor</h2>
+<p>Below is the complete Supervisor spec JSON to be submitted to the Overlord.
+Make sure these keys are properly configured for successful ingestion.</p>
+<p>Important supervisor properties</p>
+<ul>
+<li><code>descriptor</code> for the descriptor file URL</li>
+<li><code>protoMessageType</code> from the proto definition</li>
+<li><code>parser</code> should have <code>type</code> set to <code>protobuf</code>, but note that the <code>format</code> of the <code>parseSpec</code> must be <code>json</code></li>
+</ul>
+<pre><code class="hljs css language-json">{
+  <span class="hljs-attr">"type"</span>: <span class="hljs-string">"kafka"</span>,
+  <span class="hljs-attr">"dataSchema"</span>: {
+    <span class="hljs-attr">"dataSource"</span>: <span class="hljs-string">"metrics-protobuf"</span>,
+    <span class="hljs-attr">"parser"</span>: {
+      <span class="hljs-attr">"type"</span>: <span class="hljs-string">"protobuf"</span>,
+      <span class="hljs-attr">"descriptor"</span>: <span class="hljs-string">"file:///tmp/metrics.desc"</span>,
+      <span class="hljs-attr">"protoMessageType"</span>: <span class="hljs-string">"Metrics"</span>,
+      <span class="hljs-attr">"parseSpec"</span>: {
+        <span class="hljs-attr">"format"</span>: <span class="hljs-string">"json"</span>,
+        <span class="hljs-attr">"timestampSpec"</span>: {
+          <span class="hljs-attr">"column"</span>: <span class="hljs-string">"timestamp"</span>,
+          <span class="hljs-attr">"format"</span>: <span class="hljs-string">"auto"</span>
+        },
+        <span class="hljs-attr">"dimensionsSpec"</span>: {
+          <span class="hljs-attr">"dimensions"</span>: [
+            <span class="hljs-string">"unit"</span>,
+            <span class="hljs-string">"http_method"</span>,
+            <span class="hljs-string">"http_code"</span>,
+            <span class="hljs-string">"page"</span>,
+            <span class="hljs-string">"metricType"</span>,
+            <span class="hljs-string">"server"</span>
+          ],
+          <span class="hljs-attr">"dimensionExclusions"</span>: [
+            <span class="hljs-string">"timestamp"</span>,
+            <span class="hljs-string">"value"</span>
+          ]
+        }
+      }
+    },
+    <span class="hljs-attr">"metricsSpec"</span>: [
+      {
+        <span class="hljs-attr">"name"</span>: <span class="hljs-string">"count"</span>,
+        <span class="hljs-attr">"type"</span>: <span class="hljs-string">"count"</span>
+      },
+      {
+        <span class="hljs-attr">"name"</span>: <span class="hljs-string">"value_sum"</span>,
+        <span class="hljs-attr">"fieldName"</span>: <span class="hljs-string">"value"</span>,
+        <span class="hljs-attr">"type"</span>: <span class="hljs-string">"doubleSum"</span>
+      },
+      {
+        <span class="hljs-attr">"name"</span>: <span class="hljs-string">"value_min"</span>,
+        <span class="hljs-attr">"fieldName"</span>: <span class="hljs-string">"value"</span>,
+        <span class="hljs-attr">"type"</span>: <span class="hljs-string">"doubleMin"</span>
+      },
+      {
+        <span class="hljs-attr">"name"</span>: <span class="hljs-string">"value_max"</span>,
+        <span class="hljs-attr">"fieldName"</span>: <span class="hljs-string">"value"</span>,
+        <span class="hljs-attr">"type"</span>: <span class="hljs-string">"doubleMax"</span>
+      }
+    ],
+    <span class="hljs-attr">"granularitySpec"</span>: {
+      <span class="hljs-attr">"type"</span>: <span class="hljs-string">"uniform"</span>,
+      <span class="hljs-attr">"segmentGranularity"</span>: <span class="hljs-string">"HOUR"</span>,
+      <span class="hljs-attr">"queryGranularity"</span>: <span class="hljs-string">"NONE"</span>
+    }
+  },
+  <span class="hljs-attr">"tuningConfig"</span>: {
+    <span class="hljs-attr">"type"</span>: <span class="hljs-string">"kafka"</span>,
+    <span class="hljs-attr">"maxRowsPerSegment"</span>: <span class="hljs-number">5000000</span>
+  },
+  <span class="hljs-attr">"ioConfig"</span>: {
+    <span class="hljs-attr">"topic"</span>: <span class="hljs-string">"metrics_pb"</span>,
+    <span class="hljs-attr">"consumerProperties"</span>: {
+      <span class="hljs-attr">"bootstrap.servers"</span>: <span class="hljs-string">"localhost:9092"</span>
+    },
+    <span class="hljs-attr">"taskCount"</span>: <span class="hljs-number">1</span>,
+    <span class="hljs-attr">"replicas"</span>: <span class="hljs-number">1</span>,
+    <span class="hljs-attr">"taskDuration"</span>: <span class="hljs-string">"PT1H"</span>
+  }
+}
+</code></pre>
+<h2><a class="anchor" aria-hidden="true" id="adding-protobuf-messages-to-kafka"></a><a href="#adding-protobuf-messages-to-kafka" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Adding Protobuf messages to Kafka</h2>
+<p>If necessary, from your Kafka installation directory run the following command to create the Kafka topic</p>
+<pre><code class="hljs"><span class="hljs-string">./bin/kafka-topics.sh</span> <span class="hljs-params">--create</span> <span class="hljs-params">--zookeeper</span> localhost<span class="hljs-function">:2181</span> <span class="hljs-params">--replication-factor</span> 1 <span class="hljs-params">--partitions</span> 1 <span class="hljs-params">--topic</span> metrics_pb
+</code></pre>
+<p>This example script requires <code>protobuf</code> and <code>kafka-python</code> modules. With the topic in place, messages can be inserted running the following command from your Druid installation directory</p>
+<pre><code class="hljs">./bin/<span class="hljs-keyword">generate</span>-example-metrics | ./quickstart/protobuf/pb_publisher<span class="hljs-variable">.py</span>
+</code></pre>
+<p>You can confirm that data has been inserted to your Kafka topic using the following command from your Kafka installation directory</p>
+<pre><code class="hljs"><span class="hljs-string">./bin/kafka-console-consumer</span> <span class="hljs-params">--zookeeper</span> localhost <span class="hljs-params">--topic</span> metrics_pb
+</code></pre>
+<p>which should print messages like this</p>
+<pre><code class="hljs">millisecondsGETR"2017<span class="hljs-string">-04</span><span class="hljs-string">-06</span>T03:23:56Z*2002/list:request/latencyBwww1.example.com
+</code></pre>
+<p>If your supervisor created in the previous step is running, the indexing tasks should begin producing the messages and the data will soon be available for querying in Druid.</p>
+<h2><a class="anchor" aria-hidden="true" id="generating-the-example-files"></a><a href="#generating-the-example-files" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Generating the example files</h2>
+<p>The files provided in the example quickstart can be generated in the following manner starting with only <code>metrics.proto</code>.</p>
+<h3><a class="anchor" aria-hidden="true" id="metricsdesc"></a><a href="#metricsdesc" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a><code>metrics.desc</code></h3>
+<p>The descriptor file is generated using <code>protoc</code> Protobuf compiler. Given a <code>.proto</code> file, a <code>.desc</code> file can be generated like so.</p>
+<pre><code class="hljs"><span class="hljs-selector-tag">protoc</span> <span class="hljs-selector-tag">-o</span> <span class="hljs-selector-tag">metrics</span><span class="hljs-selector-class">.desc</span> <span class="hljs-selector-tag">metrics</span><span class="hljs-selector-class">.proto</span>
+</code></pre>
+<h3><a class="anchor" aria-hidden="true" id="metrics_pb2py"></a><a href="#metrics_pb2py" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a><code>metrics_pb2.py</code></h3>
+<p><code>metrics_pb2.py</code> is also generated with <code>protoc</code></p>
+<pre><code class="hljs"> protoc -o metrics.<span class="hljs-keyword">desc</span> metrics.proto <span class="hljs-comment">--python_out=.</span>
+</code></pre>
+<h3><a class="anchor" aria-hidden="true" id="pb_publisherpy"></a><a href="#pb_publisherpy" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a><code>pb_publisher.py</code></h3>
+<p>After <code>metrics_pb2.py</code> is generated, another script can be constructed to parse JSON data, convert it to Protobuf, and produce to a Kafka topic</p>
+<pre><code class="hljs css language-python"><span class="hljs-comment">#!/usr/bin/env python</span>
+
+<span class="hljs-keyword">import</span> sys
+<span class="hljs-keyword">import</span> json
+
+<span class="hljs-keyword">from</span> kafka <span class="hljs-keyword">import</span> KafkaProducer
+<span class="hljs-keyword">from</span> metrics_pb2 <span class="hljs-keyword">import</span> Metrics
+
+
+producer = KafkaProducer(bootstrap_servers=<span class="hljs-string">'localhost:9092'</span>)
+topic = <span class="hljs-string">'metrics_pb'</span>
+
+<span class="hljs-keyword">for</span> row <span class="hljs-keyword">in</span> iter(sys.stdin):
+    d = json.loads(row)
+    metrics = Metrics()
+    <span class="hljs-keyword">for</span> k, v <span class="hljs-keyword">in</span> d.items():
+        setattr(metrics, k, v)
+    pb = metrics.SerializeToString()
+    producer.send(topic, pb)
+
+producer.flush()
+</code></pre>
+</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/0.20.0/development/extensions-core/postgresql.html"><span class="arrow-prev">← </span><span class="function-name-prevnext">PostgreSQL Metadata Store</span></a><a class="docs-next button" href="/docs/0.20.0/development/extensions-core/s3.html"><span>S3-compatible</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#example-load-protobuf-messages-from-kafka">Example: Load Protobuf messages from Kafka</a><ul class="toc-headings"><li><a href="#proto-file">Proto file</a></li><li><a href="#descriptor-file">Descriptor file</a></li></ul></li><li><a href="#create-kafka-supervisor">Create Kafka Supervisor</a></li><li><a href="#adding-protobuf-messages-to-kafka">Adding Protobuf messages to Kafka</a></li><li><a href="#generating-the-example-files">Generating the example files</a><ul class="toc-headings"><li><a href="#metricsdesc"><code>metrics.desc</code></a></li><li><a href="#metrics_pb2py"><code>metrics_pb2.py</code></a></li><li><a href="#pb_publisherpy"><code>pb_publisher.py</code></a></li></ul></li></ul></nav></div><footer class="nav-footer druid-footer" id="footer"><div class="container"><div class="text-center"><p><a href="/technology">Technology</a> · <a href="/use-cases">Use Cases</a> · <a href="/druid-powered">Powered by Druid</a> · <a href="/docs/0.20.0/latest">Docs</a> · <a href="/community/">Community</a> · <a href="/downloads.html">Download</a> · <a href="/faq">FAQ</a></p></div><div class="text-center"><a title="Join the user group" href="https://groups.google.com/forum/#!forum/druid-user" target="_blank"><span class="fa fa-comments"></span></a> · <a title="Follow Druid" href="https://twitter.com/druidio" target="_blank"><span class="fab fa-twitter"></span></a> · <a title="Download via Apache" href="https://www.apache.org/dyn/closer.cgi?path=/incubator/druid/{{ site.druid_versions[0].versions[0].version }}/apache-druid-{{ site.druid_versions[0].versions[0].version }}-bin.tar.gz" target="_blank"><span class="fas fa-feather"></span></a> · <a title="GitHub" href="https://github.com/apache/druid" target="_blank"><span class="fab fa-github"></span></a></div><div class="text-center license">Copyright © 2019 <a href="https://www.apache.org/" target="_blank">Apache Software Foundation</a>.<br/>Except where otherwise noted, licensed under <a rel="license" href="http://creativecommons.org/licenses/by-sa/4.0/">CC BY-SA 4.0</a>.<br/>Apache Druid, Druid, and the Druid logo are either registered trademarks or trademarks of The Apache Software Foundation in the United States and other countries.</div></div></footer></div><script type="text/javascript" src="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.js"></script><script>
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+<h2><a class="anchor" aria-hidden="true" id="s3-extension"></a><a href="#s3-extension" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>S3 extension</h2>
+<p>This extension allows you to do 2 things:</p>
+<ul>
+<li><a href="#reading-data-from-s3">Ingest data</a> from files stored in S3.</li>
+<li>Write segments to <a href="#deep-storage">deep storage</a> in S3.</li>
+</ul>
+<p>To use this Apache Druid extension, make sure to <a href="/docs/0.20.0/development/extensions.html#loading-extensions">include</a> <code>druid-s3-extensions</code> as an extension.</p>
+<h3><a class="anchor" aria-hidden="true" id="reading-data-from-s3"></a><a href="#reading-data-from-s3" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Reading data from S3</h3>
+<p>The <a href="/docs/0.20.0/ingestion/native-batch.html#s3-input-source">S3 input source</a> is supported by the <a href="/docs/0.20.0/ingestion/native-batch.html#parallel-task">Parallel task</a>
+to read objects directly from S3. If you use the <a href="/docs/0.20.0/ingestion/hadoop.html">Hadoop task</a>,
+you can read data from S3 by specifying the S3 paths in your <a href="/docs/0.20.0/ingestion/hadoop.html#inputspec"><code>inputSpec</code></a>.</p>
+<p>To configure the extension to read objects from S3 you need to configure how to <a href="#configuration">connect to S3</a>.</p>
+<h3><a class="anchor" aria-hidden="true" id="deep-storage"></a><a href="#deep-storage" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Deep Storage</h3>
+<p>S3-compatible deep storage means either AWS S3 or a compatible service like Google Storage which exposes the same API as S3.</p>
+<p>S3 deep storage needs to be explicitly enabled by setting <code>druid.storage.type=s3</code>. <strong>Only after setting the storage type to S3 will any of the settings below take effect.</strong></p>
+<p>To correctly configure this extension for deep storage in S3, first configure how to <a href="#configuration">connect to S3</a>.
+In addition to this you need to set additional configuration, specific for <a href="#deep-storage-specific-configuration">deep storage</a></p>
+<h4><a class="anchor" aria-hidden="true" id="deep-storage-specific-configuration"></a><a href="#deep-storage-specific-configuration" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Deep storage specific configuration</h4>
+<table>
+<thead>
+<tr><th>Property</th><th>Description</th><th>Default</th></tr>
+</thead>
+<tbody>
+<tr><td><code>druid.storage.bucket</code></td><td>Bucket to store in.</td><td>Must be set.</td></tr>
+<tr><td><code>druid.storage.baseKey</code></td><td>A prefix string that will be prepended to the object names for the segments published to S3 deep storage</td><td>Must be set.</td></tr>
+<tr><td><code>druid.storage.type</code></td><td>Global deep storage provider. Must be set to <code>s3</code> to make use of this extension.</td><td>Must be set (likely <code>s3</code>).</td></tr>
+<tr><td><code>druid.storage.archiveBucket</code></td><td>S3 bucket name for archiving when running the <em>archive task</em>.</td><td>none</td></tr>
+<tr><td><code>druid.storage.archiveBaseKey</code></td><td>S3 object key prefix for archiving.</td><td>none</td></tr>
+<tr><td><code>druid.storage.disableAcl</code></td><td>Boolean flag to disable ACL. If this is set to <code>false</code>, the full control would be granted to the bucket owner. This may require to set additional permissions. See <a href="#s3-permissions-settings">S3 permissions settings</a>.</td><td>false</td></tr>
+<tr><td><code>druid.storage.useS3aSchema</code></td><td>If true, use the &quot;s3a&quot; filesystem when using Hadoop-based ingestion. If false, the &quot;s3n&quot; filesystem will be used. Only affects Hadoop-based ingestion.</td><td>false</td></tr>
+</tbody>
+</table>
+<h2><a class="anchor" aria-hidden="true" id="configuration"></a><a href="#configuration" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Configuration</h2>
+<h3><a class="anchor" aria-hidden="true" id="s3-authentication-methods"></a><a href="#s3-authentication-methods" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>S3 authentication methods</h3>
+<p>Druid uses the following credentials provider chain to connect to your S3 bucket (whether a deep storage bucket or source bucket).
+<strong>Note :</strong> <em>You can override the default credentials provider chain for connecting to source bucket by specifying an access key and secret key using <a href="/docs/0.20.0/ingestion/native-batch.html#s3-input-source">Properties Object</a> parameters in the ingestionSpec.</em></p>
+<table>
+<thead>
+<tr><th>order</th><th>type</th><th>details</th></tr>
+</thead>
+<tbody>
+<tr><td>1</td><td>Druid config file</td><td>Based on your runtime.properties if it contains values <code>druid.s3.accessKey</code> and <code>druid.s3.secretKey</code></td></tr>
+<tr><td>2</td><td>Custom properties file</td><td>Based on custom properties file where you can supply <code>sessionToken</code>, <code>accessKey</code> and <code>secretKey</code> values. This file is provided to Druid through <code>druid.s3.fileSessionCredentials</code> properties</td></tr>
+<tr><td>3</td><td>Environment variables</td><td>Based on environment variables <code>AWS_ACCESS_KEY_ID</code> and <code>AWS_SECRET_ACCESS_KEY</code></td></tr>
+<tr><td>4</td><td>Java system properties</td><td>Based on JVM properties <code>aws.accessKeyId</code> and <code>aws.secretKey</code></td></tr>
+<tr><td>5</td><td>Profile information</td><td>Based on credentials you may have on your druid instance (generally in <code>~/.aws/credentials</code>)</td></tr>
+<tr><td>6</td><td>ECS container credentials</td><td>Based on environment variables available on AWS ECS (AWS_CONTAINER_CREDENTIALS_RELATIVE_URI or AWS_CONTAINER_CREDENTIALS_FULL_URI) as described in the <a href="https://docs.aws.amazon.com/AWSJavaSDK/latest/javadoc/com/amazonaws/auth/EC2ContainerCredentialsProviderWrapper.html">EC2ContainerCredentialsProviderWrapper documentation</a></td></tr>
+<tr><td>7</td><td>Instance profile information</td><td>Based on the instance profile you may have attached to your druid instance</td></tr>
+</tbody>
+</table>
+<p>You can find more information about authentication method <a href="https://docs.aws.amazon.com/fr_fr/sdk-for-java/v1/developer-guide/credentials.html">here</a><br/>
+<strong>Note :</strong> <em>Order is important here as it indicates the precedence of authentication methods.<br/>
+So if you are trying to use Instance profile information, you <strong>must not</strong> set <code>druid.s3.accessKey</code> and <code>druid.s3.secretKey</code> in your Druid runtime.properties</em></p>
+<h3><a class="anchor" aria-hidden="true" id="s3-permissions-settings"></a><a href="#s3-permissions-settings" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>S3 permissions settings</h3>
+<p><code>s3:GetObject</code> and <code>s3:PutObject</code> are basically required for pushing/loading segments to/from S3.
+If <code>druid.storage.disableAcl</code> is set to <code>false</code>, then <code>s3:GetBucketAcl</code> and <code>s3:PutObjectAcl</code> are additionally required to set ACL for objects.</p>
+<h3><a class="anchor" aria-hidden="true" id="aws-region"></a><a href="#aws-region" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>AWS region</h3>
+<p>The AWS SDK requires that the target region be specified. Two ways of doing this are by using the JVM system property <code>aws.region</code> or the environment variable <code>AWS_REGION</code>.</p>
+<p>As an example, to set the region to 'us-east-1' through system properties:</p>
+<ul>
+<li>Add <code>-Daws.region=us-east-1</code> to the jvm.config file for all Druid services.</li>
+<li>Add <code>-Daws.region=us-east-1</code> to <code>druid.indexer.runner.javaOpts</code> in <a href="/docs/0.20.0/configuration/index.html#middlemanager-configuration">Middle Manager configuration</a> so that the property will be passed to Peon (worker) processes.</li>
+</ul>
+<h3><a class="anchor" aria-hidden="true" id="connecting-to-s3-configuration"></a><a href="#connecting-to-s3-configuration" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Connecting to S3 configuration</h3>
+<table>
+<thead>
+<tr><th>Property</th><th>Description</th><th>Default</th></tr>
+</thead>
+<tbody>
+<tr><td><code>druid.s3.accessKey</code></td><td>S3 access key. See <a href="#s3-authentication-methods">S3 authentication methods</a> for more details</td><td>Can be omitted according to authentication methods chosen.</td></tr>
+<tr><td><code>druid.s3.secretKey</code></td><td>S3 secret key. See <a href="#s3-authentication-methods">S3 authentication methods</a> for more details</td><td>Can be omitted according to authentication methods chosen.</td></tr>
+<tr><td><code>druid.s3.fileSessionCredentials</code></td><td>Path to properties file containing <code>sessionToken</code>, <code>accessKey</code> and <code>secretKey</code> value. One key/value pair per line (format <code>key=value</code>). See <a href="#s3-authentication-methods">S3 authentication methods</a> for more details</td><td>Can be omitted according to authentication methods chosen.</td></tr>
+<tr><td><code>druid.s3.protocol</code></td><td>Communication protocol type to use when sending requests to AWS. <code>http</code> or <code>https</code> can be used. This configuration would be ignored if <code>druid.s3.endpoint.url</code> is filled with a URL with a different protocol.</td><td><code>https</code></td></tr>
+<tr><td><code>druid.s3.disableChunkedEncoding</code></td><td>Disables chunked encoding. See <a href="https://docs.aws.amazon.com/AWSJavaSDK/latest/javadoc/com/amazonaws/services/s3/AmazonS3Builder.html#disableChunkedEncoding--">AWS document</a> for details.</td><td>false</td></tr>
+<tr><td><code>druid.s3.enablePathStyleAccess</code></td><td>Enables path style access. See <a href="https://docs.aws.amazon.com/AWSJavaSDK/latest/javadoc/com/amazonaws/services/s3/AmazonS3Builder.html#enablePathStyleAccess--">AWS document</a> for details.</td><td>false</td></tr>
+<tr><td><code>druid.s3.forceGlobalBucketAccessEnabled</code></td><td>Enables global bucket access. See <a href="https://docs.aws.amazon.com/AWSJavaSDK/latest/javadoc/com/amazonaws/services/s3/AmazonS3Builder.html#setForceGlobalBucketAccessEnabled-java.lang.Boolean-">AWS document</a> for details.</td><td>false</td></tr>
+<tr><td><code>druid.s3.endpoint.url</code></td><td>Service endpoint either with or without the protocol.</td><td>None</td></tr>
+<tr><td><code>druid.s3.endpoint.signingRegion</code></td><td>Region to use for SigV4 signing of requests (e.g. us-west-1).</td><td>None</td></tr>
+<tr><td><code>druid.s3.proxy.host</code></td><td>Proxy host to connect through.</td><td>None</td></tr>
+<tr><td><code>druid.s3.proxy.port</code></td><td>Port on the proxy host to connect through.</td><td>None</td></tr>
+<tr><td><code>druid.s3.proxy.username</code></td><td>User name to use when connecting through a proxy.</td><td>None</td></tr>
+<tr><td><code>druid.s3.proxy.password</code></td><td>Password to use when connecting through a proxy.</td><td>None</td></tr>
+<tr><td><code>druid.storage.sse.type</code></td><td>Server-side encryption type. Should be one of <code>s3</code>, <code>kms</code>, and <code>custom</code>. See the below <a href="#server-side-encryption">Server-side encryption section</a> for more details.</td><td>None</td></tr>
+<tr><td><code>druid.storage.sse.kms.keyId</code></td><td>AWS KMS key ID. This is used only when <code>druid.storage.sse.type</code> is <code>kms</code> and can be empty to use the default key ID.</td><td>None</td></tr>
+<tr><td><code>druid.storage.sse.custom.base64EncodedKey</code></td><td>Base64-encoded key. Should be specified if <code>druid.storage.sse.type</code> is <code>custom</code>.</td><td>None</td></tr>
+</tbody>
+</table>
+<h2><a class="anchor" aria-hidden="true" id="server-side-encryption"></a><a href="#server-side-encryption" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Server-side encryption</h2>
+<p>You can enable <a href="https://docs.aws.amazon.com/AmazonS3/latest/dev/serv-side-encryption.html">server-side encryption</a> by setting
+<code>druid.storage.sse.type</code> to a supported type of server-side encryption. The current supported types are:</p>
+<ul>
+<li>s3: <a href="https://docs.aws.amazon.com/AmazonS3/latest/dev/UsingServerSideEncryption.html">Server-side encryption with S3-managed encryption keys</a></li>
+<li>kms: <a href="https://docs.aws.amazon.com/AmazonS3/latest/dev/UsingKMSEncryption.html">Server-side encryption with AWS KMS–Managed Keys</a></li>
+<li>custom: <a href="https://docs.aws.amazon.com/AmazonS3/latest/dev/ServerSideEncryptionCustomerKeys.html">Server-side encryption with Customer-Provided Encryption Keys</a></li>
+</ul>
+</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/0.20.0/development/extensions-core/protobuf.html"><span class="arrow-prev">← </span><span>Protobuf</span></a><a class="docs-next button" href="/docs/0.20.0/development/extensions-core/simple-client-sslcontext.html"><span>Simple SSLContext Provider Module</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#s3-extension">S3 extension</a><ul class="toc-headings"><li><a href="#reading-data-from-s3">Reading data from S3</a></li><li><a href="#deep-storage">Deep Storage</a></li></ul></li><li><a href="#configuration">Configuration</a><ul class="toc-headings"><li><a href="#s3-authentication-methods">S3 authentication methods</a></li><li><a href="#s3-permissions-settings">S3 permissions settings</a></li><li><a href="#aws-region">AWS region</a></li><li><a href="#connecting-to-s3-configuration">Connecting to S3 configuration</a></li></ul></li><li><a href="#server-side-encryption">Server-side encryption</a></li></ul></nav></div><footer class="nav-footer druid-footer" id="footer"><div class="container"><div class="text-center"><p><a href="/technology">Technology</a> · <a href="/use-cases">Use Cases</a> · <a href="/druid-powered">Powered by Druid</a> · <a href="/docs/0.20.0/latest">Docs</a> · <a href="/community/">Community</a> · <a href="/downloads.html">Download</a> · <a href="/faq">FAQ</a></p></div><div class="text-center"><a title="Join the user group" href="https://groups.google.com/forum/#!forum/druid-user" target="_blank"><span class="fa fa-comments"></span></a> · <a title="Follow Druid" href="https://twitter.com/druidio" target="_blank"><span class="fab fa-twitter"></span></a> · <a title="Download via Apache" href="https://www.apache.org/dyn/closer.cgi?path=/incubator/druid/{{ site.druid_versions[0].versions[0].version }}/apache-druid-{{ site.druid_versions[0].versions[0].version }}-bin.tar.gz" target="_blank"><span class="fas fa-feather"></span></a> · <a title="GitHub" href="https://github.com/apache/druid" target="_blank"><span class="fab fa-github"></span></a></div><div class="text-center license">Copyright © 2019 <a href="https://www.apache.org/" target="_blank">Apache Software Foundation</a>.<br/>Except where otherwise noted, licensed under <a rel="license" href="http://creativecommons.org/licenses/by-sa/4.0/">CC BY-SA 4.0</a>.<br/>Apache Druid, Druid, and the Druid logo are either registered trademarks or trademarks of The Apache Software Foundation in the United States and other countries.</div></div></footer></div><script type="text/javascript" src="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.js"></script><script>
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@@ -0,0 +1,131 @@
+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Simple SSLContext Provider Module · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/0.20.0/development/extensions-core/simple-client-sslcontext.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.20.0" /><meta property="og:title" content="Simple SSLContext Provider Module · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
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+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
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+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
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+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+  -->
+<p>This Apache Druid module contains a simple implementation of <a href="http://docs.oracle.com/javase/8/docs/api/javax/net/ssl/SSLContext.html">SSLContext</a>
+that will be injected to be used with HttpClient that Druid processes use internally to communicate with each other. To learn more about
+Java's SSL support, please refer to <a href="http://docs.oracle.com/javase/8/docs/technotes/guides/security/jsse/JSSERefGuide.html">this</a> guide.</p>
+<table>
+<thead>
+<tr><th>Property</th><th>Description</th><th>Default</th><th>Required</th></tr>
+</thead>
+<tbody>
+<tr><td><code>druid.client.https.protocol</code></td><td>SSL protocol to use.</td><td><code>TLSv1.2</code></td><td>no</td></tr>
+<tr><td><code>druid.client.https.trustStoreType</code></td><td>The type of the key store where trusted root certificates are stored.</td><td><code>java.security.KeyStore.getDefaultType()</code></td><td>no</td></tr>
+<tr><td><code>druid.client.https.trustStorePath</code></td><td>The file path or URL of the TLS/SSL Key store where trusted root certificates are stored.</td><td>none</td><td>yes</td></tr>
+<tr><td><code>druid.client.https.trustStoreAlgorithm</code></td><td>Algorithm to be used by TrustManager to validate certificate chains</td><td><code>javax.net.ssl.TrustManagerFactory.getDefaultAlgorithm()</code></td><td>no</td></tr>
+<tr><td><code>druid.client.https.trustStorePassword</code></td><td>The <a href="/docs/0.20.0/operations/password-provider.html">Password Provider</a> or String password for the Trust Store.</td><td>none</td><td>yes</td></tr>
+</tbody>
+</table>
+<p>The following table contains optional parameters for supporting client certificate authentication:</p>
+<table>
+<thead>
+<tr><th>Property</th><th>Description</th><th>Default</th><th>Required</th></tr>
+</thead>
+<tbody>
+<tr><td><code>druid.client.https.keyStorePath</code></td><td>The file path or URL of the TLS/SSL Key store containing the client certificate that Druid will use when communicating with other Druid services. If this is null, the other properties in this table are ignored.</td><td>none</td><td>yes</td></tr>
+<tr><td><code>druid.client.https.keyStoreType</code></td><td>The type of the key store.</td><td>none</td><td>yes</td></tr>
+<tr><td><code>druid.client.https.certAlias</code></td><td>Alias of TLS client certificate in the keystore.</td><td>none</td><td>yes</td></tr>
+<tr><td><code>druid.client.https.keyStorePassword</code></td><td>The <a href="/docs/0.20.0/operations/password-provider.html">Password Provider</a> or String password for the Key Store.</td><td>none</td><td>no</td></tr>
+<tr><td><code>druid.client.https.keyManagerFactoryAlgorithm</code></td><td>Algorithm to use for creating KeyManager, more details <a href="https://docs.oracle.com/javase/7/docs/technotes/guides/security/jsse/JSSERefGuide.html#KeyManager">here</a>.</td><td><code>javax.net.ssl.KeyManagerFactory.getDefaultAlgorithm()</code></td><td>no</td></tr>
+<tr><td><code>druid.client.https.keyManagerPassword</code></td><td>The <a href="/docs/0.20.0/operations/password-provider.html">Password Provider</a> or String password for the Key Manager.</td><td>none</td><td>no</td></tr>
+<tr><td><code>druid.client.https.validateHostnames</code></td><td>Validate the hostname of the server. This should not be disabled unless you are using <a href="/docs/0.20.0/operations/tls-support.html">custom TLS certificate checks</a> and know that standard hostname validation is not needed.</td><td>true</td><td>no</td></tr>
+</tbody>
+</table>
+<p>This <a href="http://docs.oracle.com/javase/8/docs/technotes/guides/security/StandardNames.html">document</a> lists all the possible
+values for the above mentioned configs among others provided by Java implementation.</p>
+</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/0.20.0/development/extensions-core/s3.html"><span class="arrow-prev">← </span><span>S3-compatible</span></a><a class="docs-next button" href="/docs/0.20.0/development/extensions-core/stats.html"><span>Stats aggregator</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"></nav></div><footer class="nav-footer druid-footer" id="footer"><div class="container"><div class="text-center"><p><a href="/technology">Technology</a> · <a href="/use-cases">Use Cases</a> · <a href="/druid-powered">Powered by Druid</a> · <a href="/docs/0.20.0/latest">Docs</a> · <a href="/community/">Community</a> · <a href="/downloads.html">Download</a> · <a href="/faq">FAQ</a></p></div><div class="text-center"><a title="Join the user group" href="https://groups.google.com/forum/#!forum/druid-user" target="_blank"><span class="fa fa-comments"></span></a> · <a title="Follow Druid" href="https://twitter.com/druidio" target="_blank"><span class="fab fa-twitter"></span></a> · <a title="Download via Apache" href="https://www.apache.org/dyn/closer.cgi?path=/incubator/druid/{{ site.druid_versions[0].versions[0].version }}/apache-druid-{{ site.druid_versions[0].versions[0].version }}-bin.tar.gz" target="_blank"><span class="fas fa-feather"></span></a> · <a title="GitHub" href="https://github.com/apache/druid" target="_blank"><span class="fab fa-github"></span></a></div><div class="text-center license">Copyright © 2019 <a href="https://www.apache.org/" target="_blank">Apache Software Foundation</a>.<br/>Except where otherwise noted, licensed under <a rel="license" href="http://creativecommons.org/licenses/by-sa/4.0/">CC BY-SA 4.0</a>.<br/>Apache Druid, Druid, and the Druid logo are either registered trademarks or trademarks of The Apache Software Foundation in the United States and other countries.</div></div></footer></div><script type="text/javascript" src="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.js"></script><script>
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+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Stats aggregator · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/0.20.0/development/extensions-core/stats.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.20.0" /><meta property="og:title" content="Stats aggregator · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
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href="/docs/0.20.0/development/extensions-core/mysql.html">MySQL Metadata Store</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-core/orc.html">ORC Extension</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-core/druid-pac4j.html">Druid pac4j based Security extension</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-core/parquet.html">Apache Parquet Extension</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-core/postgresql.html">PostgreSQL Metadata Store</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-core/protobuf.html">Protobuf</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-core/s3.html">S3-compatible</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-core/simple-client-sslcontext.html">Simple SSLContext Provider Module</a></li><li class="navListItem navListItemActive"><a class="navItem" href="/docs/0.20.0/development/extensions-core/stats.html">Stats aggregator</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-core/test-stats.html">Test Stats Aggregators</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-contrib/ambari-metrics-emitter.html">Ambari Metrics Emitter</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-contrib/cassandra.html">Apache Cassandra</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-contrib/cloudfiles.html">Rackspace Cloud Files</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-contrib/distinctcount.html">DistinctCount Aggregator</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-contrib/graphite.html">Graphite Emitter</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-contrib/influx.html">InfluxDB Line Protocol Parser</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-contrib/influxdb-emitter.html">InfluxDB Emitter</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-contrib/kafka-emitter.html">Kafka Emitter</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-contrib/materialized-view.html">Materialized View</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-contrib/momentsketch-quantiles.html">Moment Sketches for Approximate Quantiles module</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-contrib/moving-average-query.html">Moving Average Query</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-contrib/opentsdb-emitter.html">OpenTSDB Emitter</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-contrib/redis-cache.html">Druid Redis Cache</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-contrib/sqlserver.html">Microsoft SQLServer</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-contrib/statsd.html">StatsD Emitter</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-contrib/tdigestsketch-quantiles.html">T-Digest Quantiles Sketch module</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-contrib/thrift.html">Thrift</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-contrib/time-min-max.html">Timestamp Min/Max aggregators</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-contrib/gce-extensions.html">GCE Extensions</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-contrib/aliyun-oss.html">Aliyun OSS</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/querying/hll-old.html">Cardinality/HyperUnique aggregators</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/querying/select-query.html">Select</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/ingestion/standalone-realtime.html">Realtime Process</a></li></ul></div></div></section></div><script>
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+  ~ Licensed to the Apache Software Foundation (ASF) under one
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+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+  -->
+<p>This Apache Druid extension includes stat-related aggregators, including variance and standard deviations, etc. Make sure to <a href="/docs/0.20.0/development/extensions.html#loading-extensions">include</a> <code>druid-stats</code> as an extension.</p>
+<h2><a class="anchor" aria-hidden="true" id="variance-aggregator"></a><a href="#variance-aggregator" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Variance aggregator</h2>
+<p>Algorithm of the aggregator is the same with that of apache hive. This is the description in GenericUDAFVariance in hive.</p>
+<p>Evaluate the variance using the algorithm described by Chan, Golub, and LeVeque in
+&quot;Algorithms for computing the sample variance: analysis and recommendations&quot;
+The American Statistician, 37 (1983) pp. 242--247.</p>
+<p>variance = variance1 + variance2 + n/(m<em>(m+n)) * pow(((m/n)</em>t1 - t2),2)</p>
+<p>where: - variance is sum(x-avg^2) (this is actually n times the variance)
+and is updated at every step. - n is the count of elements in chunk1 - m is
+the count of elements in chunk2 - t1 = sum of elements in chunk1, t2 =
+sum of elements in chunk2.</p>
+<p>This algorithm was proven to be numerically stable by J.L. Barlow in
+&quot;Error analysis of a pairwise summation algorithm to compute sample variance&quot;
+Numer. Math, 58 (1991) pp. 583--590</p>
+<blockquote>
+<p>As with all <a href="/docs/0.20.0/querying/sql.html#aggregation-functions">aggregators</a>, the order of operations across segments is
+non-deterministic. This means that if this aggregator operates with an input type of &quot;float&quot; or &quot;double&quot;, the result
+of the aggregation may not be precisely the same across multiple runs of the query.</p>
+<p>To produce consistent results, round the variance to a fixed number of decimal places so that the results are
+precisely the same across query runs.</p>
+</blockquote>
+<h3><a class="anchor" aria-hidden="true" id="pre-aggregating-variance-at-ingestion-time"></a><a href="#pre-aggregating-variance-at-ingestion-time" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Pre-aggregating variance at ingestion time</h3>
+<p>To use this feature, an &quot;variance&quot; aggregator must be included at indexing time.
+The ingestion aggregator can only apply to numeric values. If you use &quot;variance&quot;
+then any input rows missing the value will be considered to have a value of 0.</p>
+<p>User can specify expected input type as one of &quot;float&quot;, &quot;double&quot;, &quot;long&quot;, &quot;variance&quot; for ingestion, which is by default &quot;float&quot;.</p>
+<pre><code class="hljs css language-json">{
+  <span class="hljs-attr">"type"</span> : <span class="hljs-string">"variance"</span>,
+  <span class="hljs-attr">"name"</span> : &lt;output_name&gt;,
+  <span class="hljs-attr">"fieldName"</span> : &lt;metric_name&gt;,
+  <span class="hljs-attr">"inputType"</span> : &lt;input_type&gt;,
+  <span class="hljs-attr">"estimator"</span> : &lt;string&gt;
+}
+</code></pre>
+<p>To query for results, &quot;variance&quot; aggregator with &quot;variance&quot; input type or simply a &quot;varianceFold&quot; aggregator must be included in the query.</p>
+<pre><code class="hljs css language-json">{
+  <span class="hljs-attr">"type"</span> : <span class="hljs-string">"varianceFold"</span>,
+  <span class="hljs-attr">"name"</span> : &lt;output_name&gt;,
+  <span class="hljs-attr">"fieldName"</span> : &lt;metric_name&gt;,
+  <span class="hljs-attr">"estimator"</span> : &lt;string&gt;
+}
+</code></pre>
+<table>
+<thead>
+<tr><th>Property</th><th>Description</th><th>Default</th></tr>
+</thead>
+<tbody>
+<tr><td><code>estimator</code></td><td>Set &quot;population&quot; to get variance_pop rather than variance_sample, which is default.</td><td>null</td></tr>
+</tbody>
+</table>
+<h3><a class="anchor" aria-hidden="true" id="standard-deviation-post-aggregator"></a><a href="#standard-deviation-post-aggregator" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Standard deviation post-aggregator</h3>
+<p>To acquire standard deviation from variance, user can use &quot;stddev&quot; post aggregator.</p>
+<pre><code class="hljs css language-json">{
+  <span class="hljs-attr">"type"</span>: <span class="hljs-string">"stddev"</span>,
+  <span class="hljs-attr">"name"</span>: <span class="hljs-string">"&lt;output_name&gt;"</span>,
+  <span class="hljs-attr">"fieldName"</span>: <span class="hljs-string">"&lt;aggregator_name&gt;"</span>,
+  <span class="hljs-attr">"estimator"</span>: &lt;string&gt;
+}
+</code></pre>
+<h2><a class="anchor" aria-hidden="true" id="query-examples"></a><a href="#query-examples" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Query examples:</h2>
+<h3><a class="anchor" aria-hidden="true" id="timeseries-query"></a><a href="#timeseries-query" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Timeseries query</h3>
+<pre><code class="hljs css language-json">{
+  <span class="hljs-attr">"queryType"</span>: <span class="hljs-string">"timeseries"</span>,
+  <span class="hljs-attr">"dataSource"</span>: <span class="hljs-string">"testing"</span>,
+  <span class="hljs-attr">"granularity"</span>: <span class="hljs-string">"day"</span>,
+  <span class="hljs-attr">"aggregations"</span>: [
+    {
+      <span class="hljs-attr">"type"</span>: <span class="hljs-string">"variance"</span>,
+      <span class="hljs-attr">"name"</span>: <span class="hljs-string">"index_var"</span>,
+      <span class="hljs-attr">"fieldName"</span>: <span class="hljs-string">"index_var"</span>
+    }
+  ],
+  <span class="hljs-attr">"intervals"</span>: [
+    <span class="hljs-string">"2016-03-01T00:00:00.000/2013-03-20T00:00:00.000"</span>
+  ]
+}
+</code></pre>
+<h3><a class="anchor" aria-hidden="true" id="topn-query"></a><a href="#topn-query" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>TopN query</h3>
+<pre><code class="hljs css language-json">{
+  <span class="hljs-attr">"queryType"</span>: <span class="hljs-string">"topN"</span>,
+  <span class="hljs-attr">"dataSource"</span>: <span class="hljs-string">"testing"</span>,
+  <span class="hljs-attr">"dimensions"</span>: [<span class="hljs-string">"alias"</span>],
+  <span class="hljs-attr">"threshold"</span>: <span class="hljs-number">5</span>,
+  <span class="hljs-attr">"granularity"</span>: <span class="hljs-string">"all"</span>,
+  <span class="hljs-attr">"aggregations"</span>: [
+    {
+      <span class="hljs-attr">"type"</span>: <span class="hljs-string">"variance"</span>,
+      <span class="hljs-attr">"name"</span>: <span class="hljs-string">"index_var"</span>,
+      <span class="hljs-attr">"fieldName"</span>: <span class="hljs-string">"index"</span>
+    }
+  ],
+  <span class="hljs-attr">"postAggregations"</span>: [
+    {
+      <span class="hljs-attr">"type"</span>: <span class="hljs-string">"stddev"</span>,
+      <span class="hljs-attr">"name"</span>: <span class="hljs-string">"index_stddev"</span>,
+      <span class="hljs-attr">"fieldName"</span>: <span class="hljs-string">"index_var"</span>
+    }
+  ],
+  <span class="hljs-attr">"intervals"</span>: [
+    <span class="hljs-string">"2016-03-06T00:00:00/2016-03-06T23:59:59"</span>
+  ]
+}
+</code></pre>
+<h3><a class="anchor" aria-hidden="true" id="groupby-query"></a><a href="#groupby-query" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>GroupBy query</h3>
+<pre><code class="hljs css language-json">{
+  <span class="hljs-attr">"queryType"</span>: <span class="hljs-string">"groupBy"</span>,
+  <span class="hljs-attr">"dataSource"</span>: <span class="hljs-string">"testing"</span>,
+  <span class="hljs-attr">"dimensions"</span>: [<span class="hljs-string">"alias"</span>],
+  <span class="hljs-attr">"granularity"</span>: <span class="hljs-string">"all"</span>,
+  <span class="hljs-attr">"aggregations"</span>: [
+    {
+      <span class="hljs-attr">"type"</span>: <span class="hljs-string">"variance"</span>,
+      <span class="hljs-attr">"name"</span>: <span class="hljs-string">"index_var"</span>,
+      <span class="hljs-attr">"fieldName"</span>: <span class="hljs-string">"index"</span>
+    }
+  ],
+  <span class="hljs-attr">"postAggregations"</span>: [
+    {
+      <span class="hljs-attr">"type"</span>: <span class="hljs-string">"stddev"</span>,
+      <span class="hljs-attr">"name"</span>: <span class="hljs-string">"index_stddev"</span>,
+      <span class="hljs-attr">"fieldName"</span>: <span class="hljs-string">"index_var"</span>
+    }
+  ],
+  <span class="hljs-attr">"intervals"</span>: [
+    <span class="hljs-string">"2016-03-06T00:00:00/2016-03-06T23:59:59"</span>
+  ]
+}
+</code></pre>
+</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/0.20.0/development/extensions-core/simple-client-sslcontext.html"><span class="arrow-prev">← </span><span>Simple SSLContext Provider Module</span></a><a class="docs-next button" href="/docs/0.20.0/development/extensions-core/test-stats.html"><span>Test Stats Aggregators</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#variance-aggregator">Variance aggregator</a><ul class="toc-headings"><li><a href="#pre-aggregating-variance-at-ingestion-time">Pre-aggregating variance at ingestion time</a></li><li><a href="#standard-deviation-post-aggregator">Standard deviation post-aggregator</a></li></ul></li><li><a href="#query-examples">Query examples:</a><ul class="toc-headings"><li><a href="#timeseries-query">Timeseries query</a></li><li><a href="#topn-query">TopN query</a></li><li><a href="#groupby-query">GroupBy query</a></li></ul></li></ul></nav></div><footer class="nav-footer druid-footer" id="footer"><div class="container"><div class="text-center"><p><a href="/technology">Technology</a> · <a href="/use-cases">Use Cases</a> · <a href="/druid-powered">Powered by Druid</a> · <a href="/docs/0.20.0/latest">Docs</a> · <a href="/community/">Community</a> · <a href="/downloads.html">Download</a> · <a href="/faq">FAQ</a></p></div><div class="text-center"><a title="Join the user group" href="https://groups.google.com/forum/#!forum/druid-user" target="_blank"><span class="fa fa-comments"></span></a> · <a title="Follow Druid" href="https://twitter.com/druidio" target="_blank"><span class="fab fa-twitter"></span></a> · <a title="Download via Apache" href="https://www.apache.org/dyn/closer.cgi?path=/incubator/druid/{{ site.druid_versions[0].versions[0].version }}/apache-druid-{{ site.druid_versions[0].versions[0].version }}-bin.tar.gz" target="_blank"><span class="fas fa-feather"></span></a> · <a title="GitHub" href="https://github.com/apache/druid" target="_blank"><span class="fab fa-github"></span></a></div><div class="text-center license">Copyright © 2019 <a href="https://www.apache.org/" target="_blank">Apache Software Foundation</a>.<br/>Except where otherwise noted, licensed under <a rel="license" href="http://creativecommons.org/licenses/by-sa/4.0/">CC BY-SA 4.0</a>.<br/>Apache Druid, Druid, and the Druid logo are either registered trademarks or trademarks of The Apache Software Foundation in the United States and other countries.</div></div></footer></div><script type="text/javascript" src="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.js"></script><script>
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diff --git a/docs/0.20.0/development/extensions-core/test-stats.html b/docs/0.20.0/development/extensions-core/test-stats.html
new file mode 100644
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--- /dev/null
+++ b/docs/0.20.0/development/extensions-core/test-stats.html
@@ -0,0 +1,174 @@
+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Test Stats Aggregators · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/0.20.0/development/extensions-core/test-stats.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.20.0" /><meta property="og:title" content="Test Stats Aggregators · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
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+<p>This Apache Druid extension incorporates test statistics related aggregators, including z-score and p-value. Please refer to <a href="https://www.paypal-engineering.com/2017/06/29/democratizing-experimentation-data-for-product-innovations/">https://www.paypal-engineering.com/2017/06/29/democratizing-experimentation-data-for-product-innovations/</a> for math background and details.</p>
+<p>Make sure to include <code>druid-stats</code> extension in order to use these aggregators.</p>
+<h2><a class="anchor" aria-hidden="true" id="z-score-for-two-sample-ztests-post-aggregator"></a><a href="#z-score-for-two-sample-ztests-post-aggregator" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Z-Score for two sample ztests post aggregator</h2>
+<p>Please refer to <a href="https://www.isixsigma.com/tools-templates/hypothesis-testing/making-sense-two-proportions-test/">https://www.isixsigma.com/tools-templates/hypothesis-testing/making-sense-two-proportions-test/</a> and <a href="http://www.ucs.louisiana.edu/~jcb0773/Berry_statbook/Berry_statbook_chpt6.pdf">http://www.ucs.louisiana.edu/~jcb0773/Berry_statbook/Berry_statbook_chpt6.pdf</a> for more details.</p>
+<p>z = (p1 - p2) / S.E.  (assuming null hypothesis is true)</p>
+<p>Please see below for p1 and p2.
+Please note S.E. stands for standard error where</p>
+<p>S.E. = sqrt{ p1 * ( 1 - p1 )/n1 + p2 * (1 - p2)/n2) }</p>
+<p>(p1 – p2) is the observed difference between two sample proportions.</p>
+<h3><a class="anchor" aria-hidden="true" id="zscore2sample-post-aggregator"></a><a href="#zscore2sample-post-aggregator" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>zscore2sample post aggregator</h3>
+<ul>
+<li><strong><code>zscore2sample</code></strong>: calculate the z-score using two-sample z-test while converting binary variables (<strong><em>e.g.</em></strong> success or not) to continuous variables (<strong><em>e.g.</em></strong> conversion rate).</li>
+</ul>
+<pre><code class="hljs css language-json">{
+  <span class="hljs-attr">"type"</span>: <span class="hljs-string">"zscore2sample"</span>,
+  <span class="hljs-attr">"name"</span>: <span class="hljs-string">"&lt;output_name&gt;"</span>,
+  <span class="hljs-attr">"successCount1"</span>: &lt;post_aggregator&gt; success count of sample <span class="hljs-number">1</span>,
+  <span class="hljs-attr">"sample1Size"</span>: &lt;post_aggregaror&gt; sample <span class="hljs-number">1</span> size,
+  <span class="hljs-attr">"successCount2"</span>: &lt;post_aggregator&gt; success count of sample <span class="hljs-number">2</span>,
+  <span class="hljs-attr">"sample2Size"</span> : &lt;post_aggregator&gt; sample <span class="hljs-number">2</span> size
+}
+</code></pre>
+<p>Please note the post aggregator will be converting binary variables to continuous variables for two population proportions.  Specifically</p>
+<p>p1 = (successCount1) / (sample size 1)</p>
+<p>p2 = (successCount2) / (sample size 2)</p>
+<h3><a class="anchor" aria-hidden="true" id="pvalue2tailedztest-post-aggregator"></a><a href="#pvalue2tailedztest-post-aggregator" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>pvalue2tailedZtest post aggregator</h3>
+<ul>
+<li><strong><code>pvalue2tailedZtest</code></strong>: calculate p-value of two-sided z-test from zscore
+<ul>
+<li><strong><em>pvalue2tailedZtest(zscore)</em></strong> - the input is a z-score which can be calculated using the zscore2sample post aggregator</li>
+</ul></li>
+</ul>
+<pre><code class="hljs css language-json">{
+  <span class="hljs-attr">"type"</span>: <span class="hljs-string">"pvalue2tailedZtest"</span>,
+  <span class="hljs-attr">"name"</span>: <span class="hljs-string">"&lt;output_name&gt;"</span>,
+  <span class="hljs-attr">"zScore"</span>: &lt;zscore post_aggregator&gt;
+}
+</code></pre>
+<h2><a class="anchor" aria-hidden="true" id="example-usage"></a><a href="#example-usage" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Example Usage</h2>
+<p>In this example, we use zscore2sample post aggregator to calculate z-score, and then feed the z-score to pvalue2tailedZtest post aggregator to calculate p-value.</p>
+<p>A JSON query example can be as follows:</p>
+<pre><code class="hljs css language-json">{
+  ...
+    "postAggregations" : {
+    "type"   : "pvalue2tailedZtest",
+    "name"   : "pvalue",
+    "zScore" :
+    {
+     "type"   : "zscore2sample",
+     "name"   : "zscore",
+     "successCount1" :
+       { "type"   : "constant",
+         "name"   : "successCountFromPopulation1Sample",
+         "value"  : 300
+       },
+     "sample1Size" :
+       { "type"   : "constant",
+         "name"   : "sampleSizeOfPopulation1",
+         "value"  : 500
+       },
+     "successCount2":
+       { "type"   : "constant",
+         "name"   : "successCountFromPopulation2Sample",
+         "value"  : 450
+       },
+     "sample2Size" :
+       { "type"   : "constant",
+         "name"   : "sampleSizeOfPopulation2",
+         "value"  : 600
+       }
+     }
+    }
+}
+
+</code></pre>
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+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
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+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+  -->
+<p>Druid implements an extension system that allows for adding functionality at runtime. Extensions
+are commonly used to add support for deep storages (like HDFS and S3), metadata stores (like MySQL
+and PostgreSQL), new aggregators, new input formats, and so on.</p>
+<p>Production clusters will generally use at least two extensions; one for deep storage and one for a
+metadata store. Many clusters will also use additional extensions.</p>
+<h2><a class="anchor" aria-hidden="true" id="core-extensions"></a><a href="#core-extensions" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Core extensions</h2>
+<p>Core extensions are maintained by Druid committers.</p>
+<table>
+<thead>
+<tr><th>Name</th><th>Description</th><th>Docs</th></tr>
+</thead>
+<tbody>
+<tr><td>druid-avro-extensions</td><td>Support for data in Apache Avro data format.</td><td><a href="/docs/0.20.0/development/extensions-core/avro.html">link</a></td></tr>
+<tr><td>druid-azure-extensions</td><td>Microsoft Azure deep storage.</td><td><a href="/docs/0.20.0/development/extensions-core/azure.html">link</a></td></tr>
+<tr><td>druid-basic-security</td><td>Support for Basic HTTP authentication and role-based access control.</td><td><a href="/docs/0.20.0/development/extensions-core/druid-basic-security.html">link</a></td></tr>
+<tr><td>druid-bloom-filter</td><td>Support for providing Bloom filters in druid queries.</td><td><a href="/docs/0.20.0/development/extensions-core/bloom-filter.html">link</a></td></tr>
+<tr><td>druid-datasketches</td><td>Support for approximate counts and set operations with <a href="https://datasketches.apache.org/">Apache DataSketches</a>.</td><td><a href="/docs/0.20.0/development/extensions-core/datasketches-extension.html">link</a></td></tr>
+<tr><td>druid-google-extensions</td><td>Google Cloud Storage deep storage.</td><td><a href="/docs/0.20.0/development/extensions-core/google.html">link</a></td></tr>
+<tr><td>druid-hdfs-storage</td><td>HDFS deep storage.</td><td><a href="/docs/0.20.0/development/extensions-core/hdfs.html">link</a></td></tr>
+<tr><td>druid-histogram</td><td>Approximate histograms and quantiles aggregator. Deprecated, please use the <a href="/docs/0.20.0/development/extensions-core/datasketches-quantiles.html">DataSketches quantiles aggregator</a> from the <code>druid-datasketches</code> extension instead.</td><td><a href="/docs/0.20.0/development/extensions-core/approximate-histograms.html">link</a></td></tr>
+<tr><td>druid-kafka-extraction-namespace</td><td>Apache Kafka-based namespaced lookup. Requires namespace lookup extension.</td><td><a href="/docs/0.20.0/development/extensions-core/kafka-extraction-namespace.html">link</a></td></tr>
+<tr><td>druid-kafka-indexing-service</td><td>Supervised exactly-once Apache Kafka ingestion for the indexing service.</td><td><a href="/docs/0.20.0/development/extensions-core/kafka-ingestion.html">link</a></td></tr>
+<tr><td>druid-kinesis-indexing-service</td><td>Supervised exactly-once Kinesis ingestion for the indexing service.</td><td><a href="/docs/0.20.0/development/extensions-core/kinesis-ingestion.html">link</a></td></tr>
+<tr><td>druid-kerberos</td><td>Kerberos authentication for druid processes.</td><td><a href="/docs/0.20.0/development/extensions-core/druid-kerberos.html">link</a></td></tr>
+<tr><td>druid-lookups-cached-global</td><td>A module for <a href="/docs/0.20.0/querying/lookups.html">lookups</a> providing a jvm-global eager caching for lookups. It provides JDBC and URI implementations for fetching lookup data.</td><td><a href="/docs/0.20.0/development/extensions-core/lookups-cached-global.html">link</a></td></tr>
+<tr><td>druid-lookups-cached-single</td><td>Per lookup caching module to support the use cases where a lookup need to be isolated from the global pool of lookups</td><td><a href="/docs/0.20.0/development/extensions-core/druid-lookups.html">link</a></td></tr>
+<tr><td>druid-orc-extensions</td><td>Support for data in Apache ORC data format.</td><td><a href="/docs/0.20.0/development/extensions-core/orc.html">link</a></td></tr>
+<tr><td>druid-parquet-extensions</td><td>Support for data in Apache Parquet data format. Requires druid-avro-extensions to be loaded.</td><td><a href="/docs/0.20.0/development/extensions-core/parquet.html">link</a></td></tr>
+<tr><td>druid-protobuf-extensions</td><td>Support for data in Protobuf data format.</td><td><a href="/docs/0.20.0/development/extensions-core/protobuf.html">link</a></td></tr>
+<tr><td>druid-ranger-security</td><td>Support for access control through Apache Ranger.</td><td><a href="/docs/0.20.0/development/extensions-core/druid-ranger-security.html">link</a></td></tr>
+<tr><td>druid-s3-extensions</td><td>Interfacing with data in AWS S3, and using S3 as deep storage.</td><td><a href="/docs/0.20.0/development/extensions-core/s3.html">link</a></td></tr>
+<tr><td>druid-ec2-extensions</td><td>Interfacing with AWS EC2 for autoscaling middle managers</td><td>UNDOCUMENTED</td></tr>
+<tr><td>druid-stats</td><td>Statistics related module including variance and standard deviation.</td><td><a href="/docs/0.20.0/development/extensions-core/stats.html">link</a></td></tr>
+<tr><td>mysql-metadata-storage</td><td>MySQL metadata store.</td><td><a href="/docs/0.20.0/development/extensions-core/mysql.html">link</a></td></tr>
+<tr><td>postgresql-metadata-storage</td><td>PostgreSQL metadata store.</td><td><a href="/docs/0.20.0/development/extensions-core/postgresql.html">link</a></td></tr>
+<tr><td>simple-client-sslcontext</td><td>Simple SSLContext provider module to be used by Druid's internal HttpClient when talking to other Druid processes over HTTPS.</td><td><a href="/docs/0.20.0/development/extensions-core/simple-client-sslcontext.html">link</a></td></tr>
+<tr><td>druid-pac4j</td><td>OpenID Connect authentication for druid processes.</td><td><a href="/docs/0.20.0/development/extensions-core/druid-pac4j.html">link</a></td></tr>
+</tbody>
+</table>
+<h2><a class="anchor" aria-hidden="true" id="community-extensions"></a><a href="#community-extensions" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Community extensions</h2>
+<blockquote>
+<p>Community extensions are not maintained by Druid committers, although we accept patches from community members using these extensions. They may not have been as extensively tested as the core extensions.</p>
+</blockquote>
+<p>A number of community members have contributed their own extensions to Druid that are not packaged with the default Druid tarball.
+If you'd like to take on maintenance for a community extension, please post on <a href="https://lists.apache.org/list.html?dev@druid.apache.org">dev@druid.apache.org</a> to let us know!</p>
+<p>All of these community extensions can be downloaded using <a href="/docs/0.20.0/operations/pull-deps.html">pull-deps</a> while specifying a <code>-c</code> coordinate option to pull <code>org.apache.druid.extensions.contrib:{EXTENSION_NAME}:{DRUID_VERSION}</code>.</p>
+<table>
+<thead>
+<tr><th>Name</th><th>Description</th><th>Docs</th></tr>
+</thead>
+<tbody>
+<tr><td>aliyun-oss-extensions</td><td>Aliyun OSS deep storage</td><td><a href="/docs/0.20.0/development/extensions-contrib/aliyun-oss.html">link</a></td></tr>
+<tr><td>ambari-metrics-emitter</td><td>Ambari Metrics Emitter</td><td><a href="/docs/0.20.0/development/extensions-contrib/ambari-metrics-emitter.html">link</a></td></tr>
+<tr><td>druid-cassandra-storage</td><td>Apache Cassandra deep storage.</td><td><a href="/docs/0.20.0/development/extensions-contrib/cassandra.html">link</a></td></tr>
+<tr><td>druid-cloudfiles-extensions</td><td>Rackspace Cloudfiles deep storage and firehose.</td><td><a href="/docs/0.20.0/development/extensions-contrib/cloudfiles.html">link</a></td></tr>
+<tr><td>druid-distinctcount</td><td>DistinctCount aggregator</td><td><a href="/docs/0.20.0/development/extensions-contrib/distinctcount.html">link</a></td></tr>
+<tr><td>druid-redis-cache</td><td>A cache implementation for Druid based on Redis.</td><td><a href="/docs/0.20.0/development/extensions-contrib/redis-cache.html">link</a></td></tr>
+<tr><td>druid-time-min-max</td><td>Min/Max aggregator for timestamp.</td><td><a href="/docs/0.20.0/development/extensions-contrib/time-min-max.html">link</a></td></tr>
+<tr><td>sqlserver-metadata-storage</td><td>Microsoft SQLServer deep storage.</td><td><a href="/docs/0.20.0/development/extensions-contrib/sqlserver.html">link</a></td></tr>
+<tr><td>graphite-emitter</td><td>Graphite metrics emitter</td><td><a href="/docs/0.20.0/development/extensions-contrib/graphite.html">link</a></td></tr>
+<tr><td>statsd-emitter</td><td>StatsD metrics emitter</td><td><a href="/docs/0.20.0/development/extensions-contrib/statsd.html">link</a></td></tr>
+<tr><td>kafka-emitter</td><td>Kafka metrics emitter</td><td><a href="/docs/0.20.0/development/extensions-contrib/kafka-emitter.html">link</a></td></tr>
+<tr><td>druid-thrift-extensions</td><td>Support thrift ingestion</td><td><a href="/docs/0.20.0/development/extensions-contrib/thrift.html">link</a></td></tr>
+<tr><td>druid-opentsdb-emitter</td><td>OpenTSDB metrics emitter</td><td><a href="/docs/0.20.0/development/extensions-contrib/opentsdb-emitter.html">link</a></td></tr>
+<tr><td>materialized-view-selection, materialized-view-maintenance</td><td>Materialized View</td><td><a href="/docs/0.20.0/development/extensions-contrib/materialized-view.html">link</a></td></tr>
+<tr><td>druid-moving-average-query</td><td>Support for <a href="https://en.wikipedia.org/wiki/Moving_average">Moving Average</a> and other Aggregate <a href="https://en.wikibooks.org/wiki/Structured_Query_Language/Window_functions">Window Functions</a> in Druid queries.</td><td><a href="/docs/0.20.0/development/extensions-contrib/moving-average-query.html">link</a></td></tr>
+<tr><td>druid-influxdb-emitter</td><td>InfluxDB metrics emitter</td><td><a href="/docs/0.20.0/development/extensions-contrib/influxdb-emitter.html">link</a></td></tr>
+<tr><td>druid-momentsketch</td><td>Support for approximate quantile queries using the <a href="https://github.com/stanford-futuredata/momentsketch">momentsketch</a> library</td><td><a href="/docs/0.20.0/development/extensions-contrib/momentsketch-quantiles.html">link</a></td></tr>
+<tr><td>druid-tdigestsketch</td><td>Support for approximate sketch aggregators based on <a href="https://github.com/tdunning/t-digest">T-Digest</a></td><td><a href="/docs/0.20.0/development/extensions-contrib/tdigestsketch-quantiles.html">link</a></td></tr>
+<tr><td>gce-extensions</td><td>GCE Extensions</td><td><a href="/docs/0.20.0/development/extensions-contrib/gce-extensions.html">link</a></td></tr>
+</tbody>
+</table>
+<h2><a class="anchor" aria-hidden="true" id="promoting-community-extensions-to-core-extensions"></a><a href="#promoting-community-extensions-to-core-extensions" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Promoting community extensions to core extensions</h2>
+<p>Please post on <a href="https://lists.apache.org/list.html?dev@druid.apache.org">dev@druid.apache.org</a> if you'd like an extension to be promoted to core.
+If we see a community extension actively supported by the community, we can promote it to core based on community feedback.</p>
+<p>For information how to create your own extension, please see <a href="/docs/0.20.0/development/modules.html">here</a>.</p>
+<h2><a class="anchor" aria-hidden="true" id="loading-extensions"></a><a href="#loading-extensions" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Loading extensions</h2>
+<h3><a class="anchor" aria-hidden="true" id="loading-core-extensions"></a><a href="#loading-core-extensions" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Loading core extensions</h3>
+<p>Apache Druid bundles all <a href="/docs/0.20.0/development/extensions.html#core-extensions">core extensions</a> out of the box.
+See the <a href="/docs/0.20.0/development/extensions.html#core-extensions">list of extensions</a> for your options. You
+can load bundled extensions by adding their names to your common.runtime.properties
+<code>druid.extensions.loadList</code> property. For example, to load the <em>postgresql-metadata-storage</em> and
+<em>druid-hdfs-storage</em> extensions, use the configuration:</p>
+<pre><code class="hljs"><span class="hljs-attr">druid.extensions.loadList</span>=[<span class="hljs-string">"postgresql-metadata-storage"</span>, <span class="hljs-string">"druid-hdfs-storage"</span>]
+</code></pre>
+<p>These extensions are located in the <code>extensions</code> directory of the distribution.</p>
+<blockquote>
+<p>Druid bundles two sets of configurations: one for the <a href="/docs/0.20.0/tutorials/index.html">quickstart</a> and
+one for a <a href="/docs/0.20.0/tutorials/cluster.html">clustered configuration</a>. Make sure you are updating the correct
+common.runtime.properties for your setup.</p>
+</blockquote>
+<blockquote>
+<p>Because of licensing, the mysql-metadata-storage extension does not include the required MySQL JDBC driver. For instructions
+on how to install this library, see the <a href="/docs/0.20.0/development/extensions-core/mysql.html">MySQL extension page</a>.</p>
+</blockquote>
+<h3><a class="anchor" aria-hidden="true" id="loading-community-extensions"></a><a href="#loading-community-extensions" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Loading community extensions</h3>
+<p>You can also load community and third-party extensions not already bundled with Druid. To do this, first download the extension and
+then install it into your <code>extensions</code> directory. You can download extensions from their distributors directly, or
+if they are available from Maven, the included <a href="/docs/0.20.0/operations/pull-deps.html">pull-deps</a> can download them for you. To use <em>pull-deps</em>,
+specify the full Maven coordinate of the extension in the form <code>groupId:artifactId:version</code>. For example,
+for the (hypothetical) extension <em>com.example:druid-example-extension:1.0.0</em>, run:</p>
+<pre><code class="hljs">java <span class="hljs-string">\</span>
+  -cp <span class="hljs-string">"lib/*"</span> <span class="hljs-string">\</span>
+  -Ddruid.extensions.directory=<span class="hljs-string">"extensions"</span> <span class="hljs-string">\</span>
+  -Ddruid.extensions.hadoopDependenciesDir=<span class="hljs-string">"hadoop-dependencies"</span> <span class="hljs-string">\</span>
+  org.apache.druid.cli.Main tools pull-deps <span class="hljs-string">\</span>
+  --<span class="hljs-literal">no</span>-<span class="hljs-keyword">default</span>-hadoop <span class="hljs-string">\</span>
+  -c <span class="hljs-string">"com.example:druid-example-extension:1.0.0"</span>
+</code></pre>
+<p>You only have to install the extension once. Then, add <code>&quot;druid-example-extension&quot;</code> to
+<code>druid.extensions.loadList</code> in common.runtime.properties to instruct Druid to load the extension.</p>
+<blockquote>
+<p>Please make sure all the Extensions related configuration properties listed <a href="/docs/0.20.0/configuration/index.html#extensions">here</a> are set correctly.</p>
+</blockquote>
+<blockquote>
+<p>The Maven groupId for almost every <a href="/docs/0.20.0/development/extensions.html#community-extensions">community extension</a> is org.apache.druid.extensions.contrib. The artifactId is the name
+of the extension, and the version is the latest Druid stable version.</p>
+</blockquote>
+<h3><a class="anchor" aria-hidden="true" id="loading-extensions-from-the-classpath"></a><a href="#loading-extensions-from-the-classpath" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Loading extensions from the classpath</h3>
+<p>If you add your extension jar to the classpath at runtime, Druid will also load it into the system.  This mechanism is relatively easy to reason about,
+but it also means that you have to ensure that all dependency jars on the classpath are compatible.  That is, Druid makes no provisions while using
+this method to maintain class loader isolation so you must make sure that the jars on your classpath are mutually compatible.</p>
+</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/0.20.0/configuration/index.html"><span class="arrow-prev">← </span><span>Configuration reference</span></a><a class="docs-next button" href="/docs/0.20.0/configuration/logging.html"><span>Logging</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#core-extensions">Core extensions</a></li><li><a href="#community-extensions">Community extensions</a></li><li><a href="#promoting-community-extensions-to-core-extensions">Promoting community extensions to core extensions</a></li><li><a href="#loading-extensions">Loading extensions</a><ul class="toc-headings"><li><a href="#loading-core-extensions">Loading core extensions</a></li><li><a href="#loading-community-extensions">Loading community extensions</a></li><li><a href="#loading-extensions-from-the-classpath">Loading extensions from the classpath</a></li></ul></li></ul></nav></div><footer class="nav-footer druid-footer" id="footer"><div class="container"><div class="text-center"><p><a href="/technology">Technology</a> · <a href="/use-cases">Use Cases</a> · <a href="/druid-powered">Powered by Druid</a> · <a href="/docs/0.20.0/latest">Docs</a> · <a href="/community/">Community</a> · <a href="/downloads.html">Download</a> · <a href="/faq">FAQ</a></p></div><div class="text-center"><a title="Join the user group" href="https://groups.google.com/forum/#!forum/druid-user" target="_blank"><span class="fa fa-comments"></span></a> · <a title="Follow Druid" href="https://twitter.com/druidio" target="_blank"><span class="fab fa-twitter"></span></a> · <a title="Download via Apache" href="https://www.apache.org/dyn/closer.cgi?path=/incubator/druid/{{ site.druid_versions[0].versions[0].version }}/apache-druid-{{ site.druid_versions[0].versions[0].version }}-bin.tar.gz" target="_blank"><span class="fas fa-feather"></span></a> · <a title="GitHub" href="https://github.com/apache/druid" target="_blank"><span class="fab fa-github"></span></a></div><div class="text-center license">Copyright © 2019 <a href="https://www.apache.org/" target="_blank">Apache Software Foundation</a>.<br/>Except where otherwise noted, licensed under <a rel="license" href="http://creativecommons.org/licenses/by-sa/4.0/">CC BY-SA 4.0</a>.<br/>Apache Druid, Druid, and the Druid logo are either registered trademarks or trademarks of The Apache Software Foundation in the United States and other countries.</div></div></footer></div><script type="text/javascript" src="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.js"></script><script>
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+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Spatial filters · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/0.20.0/development/geo.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.20.0" /><meta property="og:title" content="Spatial filters · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
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class="navListItem"><a class="navItem" href="/docs/0.20.0/comparisons/druid-vs-spark.html">Apache Druid vs Spark</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/comparisons/druid-vs-sql-on-hadoop.html">Apache Druid vs SQL-on-Hadoop</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/design/auth.html">Authentication and Authorization</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/design/broker.html">Broker</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/design/coordinator.html">Coordinator Process</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/design/historical.html">Historical Process</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/design/indexer.html">Indexer Process</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/design/indexing-service.html">Indexing Service</a></li><li class="navListItem"><a class="navItem" 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href="/docs/0.20.0/development/extensions-core/datasketches-extension.html">DataSketches extension</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-core/datasketches-hll.html">DataSketches HLL Sketch module</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-core/datasketches-quantiles.html">DataSketches Quantiles Sketch module</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-core/datasketches-theta.html">DataSketches Theta Sketch module</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-core/datasketches-tuple.html">DataSketches Tuple Sketch module</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-core/druid-basic-security.html">Basic Security</a></li><li class="navListItem"><a class="navItem" 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href="/docs/0.20.0/development/extensions-core/simple-client-sslcontext.html">Simple SSLContext Provider Module</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-core/stats.html">Stats aggregator</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-core/test-stats.html">Test Stats Aggregators</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-contrib/ambari-metrics-emitter.html">Ambari Metrics Emitter</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-contrib/cassandra.html">Apache Cassandra</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-contrib/cloudfiles.html">Rackspace Cloud Files</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-contrib/distinctcount.html">DistinctCount Aggregator</a></li><li class="navListItem"><a class="navItem" 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class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-contrib/opentsdb-emitter.html">OpenTSDB Emitter</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-contrib/redis-cache.html">Druid Redis Cache</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-contrib/sqlserver.html">Microsoft SQLServer</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-contrib/statsd.html">StatsD Emitter</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-contrib/tdigestsketch-quantiles.html">T-Digest Quantiles Sketch module</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-contrib/thrift.html">Thrift</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-contrib/time-min-max.html">Timestamp Min/Max aggregators</a></li><li 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+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
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+  ~ regarding copyright ownership.  The ASF licenses this file
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+<blockquote>
+<p>Apache Druid supports two query languages: <a href="/docs/0.20.0/querying/sql.html">Druid SQL</a> and <a href="/docs/0.20.0/querying/querying.html">native queries</a>.
+This document describes functionality that is only available in the native language.</p>
+</blockquote>
+<p>Apache Druid supports filtering specially spatially indexed columns based on an origin and a bound.</p>
+<h2><a class="anchor" aria-hidden="true" id="spatial-indexing"></a><a href="#spatial-indexing" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Spatial indexing</h2>
+<p>In any of the data specs, there is the option of providing spatial dimensions. For example, for a JSON data spec, spatial dimensions can be specified as follows:</p>
+<pre><code class="hljs css language-json">{
+    <span class="hljs-attr">"type"</span>: <span class="hljs-string">"hadoop"</span>,
+    <span class="hljs-attr">"dataSchema"</span>: {
+        <span class="hljs-attr">"dataSource"</span>: <span class="hljs-string">"DatasourceName"</span>,
+        <span class="hljs-attr">"parser"</span>: {
+            <span class="hljs-attr">"type"</span>: <span class="hljs-string">"string"</span>,
+            <span class="hljs-attr">"parseSpec"</span>: {
+                <span class="hljs-attr">"format"</span>: <span class="hljs-string">"json"</span>,
+                <span class="hljs-attr">"timestampSpec"</span>: {
+                    <span class="hljs-attr">"column"</span>: <span class="hljs-string">"timestamp"</span>,
+                    <span class="hljs-attr">"format"</span>: <span class="hljs-string">"auto"</span>
+                },
+                <span class="hljs-attr">"dimensionsSpec"</span>: {
+                    <span class="hljs-attr">"dimensions"</span>: [],
+                    <span class="hljs-attr">"spatialDimensions"</span>: [{
+                        <span class="hljs-attr">"dimName"</span>: <span class="hljs-string">"coordinates"</span>,
+                        <span class="hljs-attr">"dims"</span>: [<span class="hljs-string">"lat"</span>, <span class="hljs-string">"long"</span>]
+                    }]
+                }
+            }
+        }
+    }
+}
+</code></pre>
+<h2><a class="anchor" aria-hidden="true" id="spatial-filters"></a><a href="#spatial-filters" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Spatial filters</h2>
+<table>
+<thead>
+<tr><th>property</th><th>description</th><th>required?</th></tr>
+</thead>
+<tbody>
+<tr><td>dimName</td><td>The name of the spatial dimension. A spatial dimension may be constructed from multiple other dimensions or it may already exist as part of an event. If a spatial dimension already exists, it must be an array of coordinate values.</td><td>yes</td></tr>
+<tr><td>dims</td><td>A list of dimension names that comprise a spatial dimension.</td><td>no</td></tr>
+</tbody>
+</table>
+<p>The grammar for a spatial filter is as follows:</p>
+<pre><code class="hljs css language-json">"filter" : {
+    "type": "spatial",
+    "dimension": "spatialDim",
+    "bound": {
+        "type": "rectangular",
+        "minCoords": [10.0, 20.0],
+        "maxCoords": [30.0, 40.0]
+    }
+}
+</code></pre>
+<h3><a class="anchor" aria-hidden="true" id="bound-types"></a><a href="#bound-types" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Bound types</h3>
+<h4><a class="anchor" aria-hidden="true" id="rectangular"></a><a href="#rectangular" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a><code>rectangular</code></h4>
+<table>
+<thead>
+<tr><th>property</th><th>description</th><th>required?</th></tr>
+</thead>
+<tbody>
+<tr><td>minCoords</td><td>List of minimum dimension coordinates for coordinates [x, y, z, …]</td><td>yes</td></tr>
+<tr><td>maxCoords</td><td>List of maximum dimension coordinates for coordinates [x, y, z, …]</td><td>yes</td></tr>
+</tbody>
+</table>
+<h4><a class="anchor" aria-hidden="true" id="radius"></a><a href="#radius" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a><code>radius</code></h4>
+<table>
+<thead>
+<tr><th>property</th><th>description</th><th>required?</th></tr>
+</thead>
+<tbody>
+<tr><td>coords</td><td>Origin coordinates in the form [x, y, z, …]</td><td>yes</td></tr>
+<tr><td>radius</td><td>The float radius value</td><td>yes</td></tr>
+</tbody>
+</table>
+<h4><a class="anchor" aria-hidden="true" id="polygon"></a><a href="#polygon" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a><code>polygon</code></h4>
+<table>
+<thead>
+<tr><th>property</th><th>description</th><th>required?</th></tr>
+</thead>
+<tbody>
+<tr><td>abscissa</td><td>Horizontal coordinate for corners of the polygon</td><td>yes</td></tr>
+<tr><td>ordinate</td><td>Vertical coordinate for corners of the polygon</td><td>yes</td></tr>
+</tbody>
+</table>
+</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/0.20.0/querying/virtual-columns.html"><span class="arrow-prev">← </span><span>Virtual columns</span></a><a class="docs-next button" href="/docs/0.20.0/configuration/index.html"><span>Configuration reference</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#spatial-indexing">Spatial indexing</a></li><li><a href="#spatial-filters">Spatial filters</a><ul class="toc-headings"><li><a href="#bound-types">Bound types</a></li></ul></li></ul></nav></div><footer class="nav-footer druid-footer" id="footer"><div class="container"><div class="text-center"><p><a href="/technology">Technology</a> · <a href="/use-cases">Use Cases</a> · <a href="/druid-powered">Powered by Druid</a> · <a href="/docs/0.20.0/latest">Docs</a> · <a href="/community/">Community</a> · <a href="/downloads.html">Download</a> · <a href="/faq">FAQ</a></p></div><div class="text-center"><a title="Join the user group" href="https://groups.google.com/forum/#!forum/druid-user" target="_blank"><span class="fa fa-comments"></span></a> · <a title="Follow Druid" href="https://twitter.com/druidio" target="_blank"><span class="fab fa-twitter"></span></a> · <a title="Download via Apache" href="https://www.apache.org/dyn/closer.cgi?path=/incubator/druid/{{ site.druid_versions[0].versions[0].version }}/apache-druid-{{ site.druid_versions[0].versions[0].version }}-bin.tar.gz" target="_blank"><span class="fas fa-feather"></span></a> · <a title="GitHub" href="https://github.com/apache/druid" target="_blank"><span class="fab fa-github"></span></a></div><div class="text-center license">Copyright © 2019 <a href="https://www.apache.org/" target="_blank">Apache Software Foundation</a>.<br/>Except where otherwise noted, licensed under <a rel="license" href="http://creativecommons.org/licenses/by-sa/4.0/">CC BY-SA 4.0</a>.<br/>Apache Druid, Druid, and the Druid logo are either registered trademarks or trademarks of The Apache Software Foundation in the United States and other countries.</div></div></footer></div><script type="text/javascript" src="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.js"></script><script>
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+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>JavaScript programming guide · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/0.20.0/development/javascript.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.20.0" /><meta property="og:title" content="JavaScript programming guide · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
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href="/docs/0.20.0/comparisons/druid-vs-redshift.html">Apache Druid vs Redshift</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/comparisons/druid-vs-spark.html">Apache Druid vs Spark</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/comparisons/druid-vs-sql-on-hadoop.html">Apache Druid vs SQL-on-Hadoop</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/design/auth.html">Authentication and Authorization</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/design/broker.html">Broker</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/design/coordinator.html">Coordinator Process</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/design/historical.html">Historical Process</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/design/indexer.html">Indexer Process</a></li><li class="navListItem"><a class="navItem" 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+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
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+  -->
+<p>This page discusses how to use JavaScript to extend Apache Druid.</p>
+<h2><a class="anchor" aria-hidden="true" id="examples"></a><a href="#examples" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Examples</h2>
+<p>JavaScript can be used to extend Druid in a variety of ways:</p>
+<ul>
+<li><a href="../querying/aggregations.html#javascript-aggregator">Aggregators</a></li>
+<li><a href="../querying/dimensionspecs.html#javascript-extraction-function">Extraction functions</a></li>
+<li><a href="../querying/filters.html#javascript-filter">Filters</a></li>
+<li><a href="../querying/post-aggregations.html#javascript-post-aggregator">Post-aggregators</a></li>
+<li><a href="../ingestion/data-formats.html#javascript-parsespec">Input parsers</a></li>
+<li><a href="../design/router.html#javascript">Router strategy</a></li>
+<li><a href="../configuration/index.html#javascript-worker-select-strategy">Worker select strategy</a></li>
+</ul>
+<p>JavaScript can be injected dynamically at runtime, making it convenient to rapidly prototype new functionality
+without needing to write and deploy Druid extensions.</p>
+<p>Druid uses the Mozilla Rhino engine at optimization level 9 to compile and execute JavaScript.</p>
+<h2><a class="anchor" aria-hidden="true" id="security"></a><a href="#security" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Security</h2>
+<p>Druid does not execute JavaScript functions in a sandbox, so they have full access to the machine. So JavaScript
+functions allow users to execute arbitrary code inside druid process. So, by default, JavaScript is disabled.
+However, on dev/staging environments or secured production environments you can enable those by setting
+the <a href="../configuration/index.html#javascript">configuration property</a>
+<code>druid.javascript.enabled = true</code>.</p>
+<h2><a class="anchor" aria-hidden="true" id="global-variables"></a><a href="#global-variables" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Global variables</h2>
+<p>Avoid using global variables. Druid may share the global scope between multiple threads, which can lead to
+unpredictable results if global variables are used.</p>
+<h2><a class="anchor" aria-hidden="true" id="performance"></a><a href="#performance" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Performance</h2>
+<p>Simple JavaScript functions typically have a slight performance penalty to native speed. More complex JavaScript
+functions can have steeper performance penalties. Druid compiles JavaScript functions once on each data process per query.</p>
+<p>You may need to pay special attention to garbage collection when making heavy use of JavaScript functions, especially
+garbage collection of the compiled classes themselves. Be sure to use a garbage collector configuration that supports
+timely collection of unused classes (this is generally easier on JDK8 with the Metaspace than it is on JDK7).</p>
+<h2><a class="anchor" aria-hidden="true" id="javascript-vs-native-extensions"></a><a href="#javascript-vs-native-extensions" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>JavaScript vs. Native Extensions</h2>
+<p>Generally we recommend using JavaScript when security is not an issue, and when speed of development is more important
+than performance or memory use. If security is an issue, or if performance and memory use are of the utmost importance,
+we recommend developing a native Druid extension.</p>
+<p>In addition, native Druid extensions are more flexible than JavaScript functions. There are some kinds of extensions
+(like sketches) that must be written as native Druid extensions due to their need for custom data formats.</p>
+</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/0.20.0/development/modules.html"><span class="arrow-prev">← </span><span>Creating extensions</span></a><a class="docs-next button" href="/docs/0.20.0/development/build.html"><span>Build from source</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#examples">Examples</a></li><li><a href="#security">Security</a></li><li><a href="#global-variables">Global variables</a></li><li><a href="#performance">Performance</a></li><li><a href="#javascript-vs-native-extensions">JavaScript vs. Native Extensions</a></li></ul></nav></div><footer class="nav-footer druid-footer" id="footer"><div class="container"><div class="text-center"><p><a href="/technology">Technology</a> · <a href="/use-cases">Use Cases</a> · <a href="/druid-powered">Powered by Druid</a> · <a href="/docs/0.20.0/latest">Docs</a> · <a href="/community/">Community</a> · <a href="/downloads.html">Download</a> · <a href="/faq">FAQ</a></p></div><div class="text-center"><a title="Join the user group" href="https://groups.google.com/forum/#!forum/druid-user" target="_blank"><span class="fa fa-comments"></span></a> · <a title="Follow Druid" href="https://twitter.com/druidio" target="_blank"><span class="fab fa-twitter"></span></a> · <a title="Download via Apache" href="https://www.apache.org/dyn/closer.cgi?path=/incubator/druid/{{ site.druid_versions[0].versions[0].version }}/apache-druid-{{ site.druid_versions[0].versions[0].version }}-bin.tar.gz" target="_blank"><span class="fas fa-feather"></span></a> · <a title="GitHub" href="https://github.com/apache/druid" target="_blank"><span class="fab fa-github"></span></a></div><div class="text-center license">Copyright © 2019 <a href="https://www.apache.org/" target="_blank">Apache Software Foundation</a>.<br/>Except where otherwise noted, licensed under <a rel="license" href="http://creativecommons.org/licenses/by-sa/4.0/">CC BY-SA 4.0</a>.<br/>Apache Druid, Druid, and the Druid logo are either registered trademarks or trademarks of The Apache Software Foundation in the United States and other countries.</div></div></footer></div><script type="text/javascript" src="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.js"></script><script>
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+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Creating extensions · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/0.20.0/development/modules.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.20.0" /><meta property="og:title" content="Creating extensions · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
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class="icon-toc"></i></div></div><div class="navGroups"><div class="navGroup"><h3 class="navGroupCategoryTitle collapsible">Getting started<span class="arrow"><svg width="24" height="24" viewBox="0 0 24 24"><path fill="#565656" d="M7.41 15.41L12 10.83l4.59 4.58L18 14l-6-6-6 6z"></path><path d="M0 0h24v24H0z" fill="none"></path></svg></span></h3><ul class="hide"><li class="navListItem"><a class="navItem" href="/docs/0.20.0/design/index.html">Introduction to Apache Druid</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/tutorials/index.html">Quickstart</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/tutorials/docker.html">Docker</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/operations/single-server.html">Single server deployment</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/tutorials/cluster.html">Clustered deployment</a></li></ul></div><div class="navGroup"><h3 class="navGroupCategoryTitle collapsible">Tutorials<span class="arrow"><svg width="24" height="24" viewBox="0 0 24 24"><path fill="#565656" d="M7.41 15.41L12 10.83l4.59 4.58L18 14l-6-6-6 6z"></path><path d="M0 0h24v24H0z" fill="none"></path></svg></span></h3><ul class="hide"><li class="navListItem"><a class="navItem" href="/docs/0.20.0/tutorials/tutorial-batch.html">Loading files natively</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/tutorials/tutorial-kafka.html">Load from Apache Kafka</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/tutorials/tutorial-batch-hadoop.html">Load from Apache Hadoop</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/tutorials/tutorial-query.html">Querying data</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/tutorials/tutorial-rollup.html">Roll-up</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/tutorials/tutorial-retention.html">Configuring data retention</a></li><li 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+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
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+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
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+  -->
+<p>Druid uses a module system that allows for the addition of extensions at runtime.</p>
+<h2><a class="anchor" aria-hidden="true" id="writing-your-own-extensions"></a><a href="#writing-your-own-extensions" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Writing your own extensions</h2>
+<p>Druid's extensions leverage Guice in order to add things at runtime.  Basically, Guice is a framework for Dependency Injection, but we use it to hold the expected object graph of the Druid process.  Extensions can make any changes they want/need to the object graph via adding Guice bindings.  While the extensions actually give you the capability to change almost anything however you want, in general, we expect people to want to extend one of the things listed below.  This means that we honor our <a href="/docs/0.20.0/development/versioning.html">versioning strategy</a> for changes that affect the interfaces called out on this page, but other interfaces are deemed &quot;internal&quot; and can be changed in an incompatible manner even between patch releases.</p>
+<ol>
+<li>Add a new deep storage implementation by extending the <code>org.apache.druid.segment.loading.DataSegment*</code> and
+<code>org.apache.druid.tasklogs.TaskLog*</code> classes.</li>
+<li>Add a new input source by extending <code>org.apache.druid.data.input.InputSource</code>.</li>
+<li>Add a new input entity by extending <code>org.apache.druid.data.input.InputEntity</code>.</li>
+<li>Add a new input source reader if necessary by extending <code>org.apache.druid.data.input.InputSourceReader</code>. You can use <code>org.apache.druid.data.input.impl.InputEntityIteratingReader</code> in most cases.</li>
+<li>Add a new input format by extending <code>org.apache.druid.data.input.InputFormat</code>.</li>
+<li>Add a new input entity reader by extending <code>org.apache.druid.data.input.TextReader</code> for text formats or <code>org.apache.druid.data.input.IntermediateRowParsingReader</code> for binary formats.</li>
+<li>Add Aggregators by extending <code>org.apache.druid.query.aggregation.AggregatorFactory</code>, <code>org.apache.druid.query.aggregation.Aggregator</code>,
+and <code>org.apache.druid.query.aggregation.BufferAggregator</code>.</li>
+<li>Add PostAggregators by extending <code>org.apache.druid.query.aggregation.PostAggregator</code>.</li>
+<li>Add ExtractionFns by extending <code>org.apache.druid.query.extraction.ExtractionFn</code>.</li>
+<li>Add Complex metrics by extending <code>org.apache.druid.segment.serde.ComplexMetricSerde</code>.</li>
+<li>Add new Query types by extending <code>org.apache.druid.query.QueryRunnerFactory</code>, <code>org.apache.druid.query.QueryToolChest</code>, and
+<code>org.apache.druid.query.Query</code>.</li>
+<li>Add new Jersey resources by calling <code>Jerseys.addResource(binder, clazz)</code>.</li>
+<li>Add new Jetty filters by extending <code>org.apache.druid.server.initialization.jetty.ServletFilterHolder</code>.</li>
+<li>Add new secret providers by extending <code>org.apache.druid.metadata.PasswordProvider</code>.</li>
+<li>Add new ingest transform by implementing the <code>org.apache.druid.segment.transform.Transform</code> interface from the <code>druid-processing</code> package.</li>
+<li>Bundle your extension with all the other Druid extensions</li>
+</ol>
+<p>Extensions are added to the system via an implementation of <code>org.apache.druid.initialization.DruidModule</code>.</p>
+<h3><a class="anchor" aria-hidden="true" id="creating-a-druid-module"></a><a href="#creating-a-druid-module" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Creating a Druid Module</h3>
+<p>The DruidModule class is has two methods</p>
+<ol>
+<li>A <code>configure(Binder)</code> method</li>
+<li>A <code>getJacksonModules()</code> method</li>
+</ol>
+<p>The <code>configure(Binder)</code> method is the same method that a normal Guice module would have.</p>
+<p>The <code>getJacksonModules()</code> method provides a list of Jackson modules that are used to help initialize the Jackson ObjectMapper instances used by Druid.  This is how you add extensions that are instantiated via Jackson (like AggregatorFactory and InputSource objects) to Druid.</p>
+<h3><a class="anchor" aria-hidden="true" id="registering-your-druid-module"></a><a href="#registering-your-druid-module" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Registering your Druid Module</h3>
+<p>Once you have your DruidModule created, you will need to package an extra file in the <code>META-INF/services</code> directory of your jar.  This is easiest to accomplish with a maven project by creating files in the <code>src/main/resources</code> directory.  There are examples of this in the Druid code under the <code>cassandra-storage</code>, <code>hdfs-storage</code> and <code>s3-extensions</code> modules, for examples.</p>
+<p>The file that should exist in your jar is</p>
+<p><code>META-INF/services/org.apache.druid.initialization.DruidModule</code></p>
+<p>It should be a text file with a new-line delimited list of package-qualified classes that implement DruidModule like</p>
+<pre><code class="hljs"><span class="hljs-selector-tag">org</span><span class="hljs-selector-class">.apache</span><span class="hljs-selector-class">.druid</span><span class="hljs-selector-class">.storage</span><span class="hljs-selector-class">.cassandra</span><span class="hljs-selector-class">.CassandraDruidModule</span>
+</code></pre>
+<p>If your jar has this file, then when it is added to the classpath or as an extension, Druid will notice the file and will instantiate instances of the Module.  Your Module should have a default constructor, but if you need access to runtime configuration properties, it can have a method with @Inject on it to get a Properties object injected into it from Guice.</p>
+<h3><a class="anchor" aria-hidden="true" id="adding-a-new-deep-storage-implementation"></a><a href="#adding-a-new-deep-storage-implementation" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Adding a new deep storage implementation</h3>
+<p>Check the <code>azure-storage</code>, <code>google-storage</code>, <code>cassandra-storage</code>, <code>hdfs-storage</code> and <code>s3-extensions</code> modules for examples of how to do this.</p>
+<p>The basic idea behind the extension is that you need to add bindings for your DataSegmentPusher and DataSegmentPuller objects.  The way to add them is something like (taken from HdfsStorageDruidModule)</p>
+<pre><code class="hljs css language-java">Binders.dataSegmentPullerBinder(binder)
+       .addBinding(<span class="hljs-string">"hdfs"</span>)
+       .to(HdfsDataSegmentPuller<span class="hljs-class">.<span class="hljs-keyword">class</span>).<span class="hljs-title">in</span>(<span class="hljs-title">LazySingleton</span>.<span class="hljs-title">class</span>)</span>;
+
+Binders.dataSegmentPusherBinder(binder)
+       .addBinding(<span class="hljs-string">"hdfs"</span>)
+       .to(HdfsDataSegmentPusher<span class="hljs-class">.<span class="hljs-keyword">class</span>).<span class="hljs-title">in</span>(<span class="hljs-title">LazySingleton</span>.<span class="hljs-title">class</span>)</span>;
+</code></pre>
+<p><code>Binders.dataSegment*Binder()</code> is a call provided by the druid-core jar which sets up a Guice multibind &quot;MapBinder&quot;.  If that doesn't make sense, don't worry about it, just think of it as a magical incantation.</p>
+<p><code>addBinding(&quot;hdfs&quot;)</code> for the Puller binder creates a new handler for loadSpec objects of type &quot;hdfs&quot;.  For the Pusher binder it creates a new type value that you can specify for the <code>druid.storage.type</code> parameter.</p>
+<p><code>to(...).in(...);</code> is normal Guice stuff.</p>
+<p>In addition to DataSegmentPusher and DataSegmentPuller, you can also bind:</p>
+<ul>
+<li>DataSegmentKiller: Removes segments, used as part of the Kill Task to delete unused segments, i.e. perform garbage collection of segments that are either superseded by newer versions or that have been dropped from the cluster.</li>
+<li>DataSegmentMover: Allow migrating segments from one place to another, currently this is only used as part of the MoveTask to move unused segments to a different S3 bucket or prefix, typically to reduce storage costs of unused data (e.g. move to glacier or cheaper storage)</li>
+<li>DataSegmentArchiver: Just a wrapper around Mover, but comes with a pre-configured target bucket/path, so it doesn't have to be specified at runtime as part of the ArchiveTask.</li>
+</ul>
+<h3><a class="anchor" aria-hidden="true" id="validating-your-deep-storage-implementation"></a><a href="#validating-your-deep-storage-implementation" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Validating your deep storage implementation</h3>
+<p><strong>WARNING!</strong> This is not a formal procedure, but a collection of hints to validate if your new deep storage implementation is able do push, pull and kill segments.</p>
+<p>It's recommended to use batch ingestion tasks to validate your implementation.
+The segment will be automatically rolled up to Historical note after ~20 seconds.
+In this way, you can validate both push (at realtime process) and pull (at Historical process) segments.</p>
+<ul>
+<li>DataSegmentPusher</li>
+</ul>
+<p>Wherever your data storage (cloud storage service, distributed file system, etc.) is, you should be able to see one new file: <code>index.zip</code> (<code>partitionNum_index.zip</code> for HDFS data storage) after your ingestion task ends.</p>
+<ul>
+<li>DataSegmentPuller</li>
+</ul>
+<p>After ~20 secs your ingestion task ends, you should be able to see your Historical process trying to load the new segment.</p>
+<p>The following example was retrieved from a Historical process configured to use Azure for deep storage:</p>
+<pre><code class="hljs">2015<span class="hljs-string">-04</span><span class="hljs-string">-14</span>T02:42:33,450 INFO [ZkCoordinator<span class="hljs-string">-0</span>] org.apache.druid.server.coordination.ZkCoordinator - New request[LOAD: dde_2015<span class="hljs-string">-01</span><span class="hljs-string">-02</span>T00:00:00.000Z_2015<span class="hljs-string">-01</span><span class="hljs-string">-03</span>T00:00:00
+.000Z_2015<span class="hljs-string">-04</span><span class="hljs-string">-14</span>T02:41:09.484Z] with zNode[/druid/dev/loadQueue/192.168.33.104:8081/dde_2015<span class="hljs-string">-01</span><span class="hljs-string">-02</span>T00:00:00.000Z_2015<span class="hljs-string">-01</span><span class="hljs-string">-03</span>T00:00:00.000Z_2015<span class="hljs-string">-04</span><span class="hljs-string">-14</span>T02:41:09.
+484Z].
+2015<span class="hljs-string">-04</span><span class="hljs-string">-14</span>T02:42:33,451 INFO [ZkCoordinator<span class="hljs-string">-0</span>] org.apache.druid.server.coordination.ZkCoordinator - Loading segment dde_2015<span class="hljs-string">-01</span><span class="hljs-string">-02</span>T00:00:00.000Z_2015<span class="hljs-string">-01</span><span class="hljs-string">-03</span>T00:00:00.0
+00Z_2015<span class="hljs-string">-04</span><span class="hljs-string">-14</span>T02:41:09.484Z
+2015<span class="hljs-string">-04</span><span class="hljs-string">-14</span>T02:42:33,463 INFO [ZkCoordinator<span class="hljs-string">-0</span>] org.apache.druid.guice.JsonConfigurator - Loaded class[class org.apache.druid.storage.azure.AzureAccountConfig] from props[drui
+d.azure.] as [org.apache.druid.storage.azure.AzureAccountConfig@759c9ad9]
+2015<span class="hljs-string">-04</span><span class="hljs-string">-14</span>T02:49:08,275 INFO [ZkCoordinator<span class="hljs-string">-0</span>] org.apache.druid.utils.CompressionUtils - Unzipping file[/opt/druid/tmp/compressionUtilZipCache1263964429587449785.z
+ip] to [/opt/druid/zk_druid/dde/2015<span class="hljs-string">-01</span><span class="hljs-string">-02</span>T00:00:00.000Z_2015<span class="hljs-string">-01</span><span class="hljs-string">-03</span>T00:00:00.000Z/2015<span class="hljs-string">-04</span><span class="hljs-string">-14</span>T02:41:09.484Z/0]
+2015<span class="hljs-string">-04</span><span class="hljs-string">-14</span>T02:49:08,276 INFO [ZkCoordinator<span class="hljs-string">-0</span>] org.apache.druid.storage.azure.AzureDataSegmentPuller - Loaded 1196 bytes from [dde/2015<span class="hljs-string">-01</span><span class="hljs-string">-02</span>T00:00:00.000Z_2015<span class="hljs-string">-01</span><span class="hljs-string">-03</span>
+T00:00:00.000Z/2015<span class="hljs-string">-04</span><span class="hljs-string">-14</span>T02:41:09.484Z/0/index.zip] to [/opt/druid/zk_druid/dde/2015<span class="hljs-string">-01</span><span class="hljs-string">-02</span>T00:00:00.000Z_2015<span class="hljs-string">-01</span><span class="hljs-string">-03</span>T00:00:00.000Z/2015<span class="hljs-string">-04</span><span class="hljs-string">-14</span>T02:41:09.484Z/0]
+2015<span class="hljs-string">-04</span><span class="hljs-string">-14</span>T02:49:08,277 WARN [ZkCoordinator<span class="hljs-string">-0</span>] org.apache.druid.segment.loading.SegmentLoaderLocalCacheManager - Segment [dde_2015<span class="hljs-string">-01</span><span class="hljs-string">-02</span>T00:00:00.000Z_2015<span class="hljs-string">-01</span><span class="hljs-string">-03</span>T00:00:00.000Z_2015<span class="hljs-string">-04</span><span class="hljs-string">-14</span>T02:41:09.484Z] is different than expected size. Expected [0] found [1196]
+2015<span class="hljs-string">-04</span><span class="hljs-string">-14</span>T02:49:08,282 INFO [ZkCoordinator<span class="hljs-string">-0</span>] org.apache.druid.server.coordination.BatchDataSegmentAnnouncer - Announcing segment[dde_2015<span class="hljs-string">-01</span><span class="hljs-string">-02</span>T00:00:00.000Z_2015<span class="hljs-string">-01</span><span class="hljs-string">-03</span>T00:00:00.000Z_2015<span class="hljs-string">-04</span><span class="hljs-string">-14</span>T02:41:09.484Z] at path[/druid/dev/segments/192.168.33.104:8081/192.168.33.104:8081_historical__default_tier_2015<span class="hljs-string">-04</span><span class="hljs-string">-14</span>T02:49:08.282Z_7bb87230ebf940188511dd4a53ffd7351]
+2015<span class="hljs-string">-04</span><span class="hljs-string">-14</span>T02:49:08,292 INFO [ZkCoordinator<span class="hljs-string">-0</span>] org.apache.druid.server.coordination.ZkCoordinator - Completed request [LOAD: dde_2015<span class="hljs-string">-01</span><span class="hljs-string">-02</span>T00:00:00.000Z_2015<span class="hljs-string">-01</span><span class="hljs-string">-03</span>T00:00:00.000Z_2015<span class="hljs-string">-04</span><span class="hljs-string">-14</span>T02:41:09.484Z]
+</code></pre>
+<ul>
+<li>DataSegmentKiller</li>
+</ul>
+<p>The easiest way of testing the segment killing is marking a segment as not used and then starting a killing task through the old Coordinator console.</p>
+<p>To mark a segment as not used, you need to connect to your metadata storage and update the <code>used</code> column to <code>false</code> on the segment table rows.</p>
+<p>To start a segment killing task, you need to access the old Coordinator console <code>http://&lt;COODRINATOR_IP&gt;:&lt;COORDINATOR_PORT/old-console/kill.html</code> then select the appropriate datasource and then input a time range (e.g. <code>2000/3000</code>).</p>
+<p>After the killing task ends, <code>index.zip</code> (<code>partitionNum_index.zip</code> for HDFS data storage) file should be deleted from the data storage.</p>
+<h3><a class="anchor" aria-hidden="true" id="adding-support-for-a-new-input-source"></a><a href="#adding-support-for-a-new-input-source" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Adding support for a new input source</h3>
+<p>Adding support for a new input source requires to implement three interfaces, i.e., <code>InputSource</code>, <code>InputEntity</code>, and <code>InputSourceReader</code>.
+<code>InputSource</code> is to define where the input data is stored. <code>InputEntity</code> is to define how data can be read in parallel
+in <a href="/docs/0.20.0/ingestion/native-batch.html">native parallel indexing</a>.
+<code>InputSourceReader</code> defines how to read your new input source and you can simply use the provided <code>InputEntityIteratingReader</code> in most cases.</p>
+<p>There is an example of this in the <code>druid-s3-extensions</code> module with the <code>S3InputSource</code> and <code>S3Entity</code>.</p>
+<p>Adding an InputSource is done almost entirely through the Jackson Modules instead of Guice. Specifically, note the implementation</p>
+<pre><code class="hljs css language-java">@Override
+public List&lt;? extends Module&gt; getJacksonModules()
+{
+  return ImmutableList.of(
+          new SimpleModule().registerSubtypes(new NamedType(S3InputSource.class, "s3"))
+  );
+}
+</code></pre>
+<p>This is registering the InputSource with Jackson's polymorphic serialization/deserialization layer.  More concretely, having this will mean that if you specify a <code>&quot;inputSource&quot;: { &quot;type&quot;: &quot;s3&quot;, ... }</code> in your IO config, then the system will load this InputSource for your <code>InputSource</code> implementation.</p>
+<p>Note that inside of Druid, we have made the <code>@JacksonInject</code> annotation for Jackson deserialized objects actually use the base Guice injector to resolve the object to be injected.  So, if your InputSource needs access to some object, you can add a <code>@JacksonInject</code> annotation on a setter and it will get set on instantiation.</p>
+<h3><a class="anchor" aria-hidden="true" id="adding-support-for-a-new-data-format"></a><a href="#adding-support-for-a-new-data-format" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Adding support for a new data format</h3>
+<p>Adding support for a new data format requires implementing two interfaces, i.e., <code>InputFormat</code> and <code>InputEntityReader</code>.
+<code>InputFormat</code> is to define how your data is formatted. <code>InputEntityReader</code> is to define how to parse your data and convert into Druid <code>InputRow</code>.</p>
+<p>There is an example in the <code>druid-orc-extensions</code> module with the <code>OrcInputFormat</code> and <code>OrcReader</code>.</p>
+<p>Adding an InputFormat is very similar to adding an InputSource. They operate purely through Jackson and thus should just be additions to the Jackson modules returned by your DruidModule.</p>
+<h3><a class="anchor" aria-hidden="true" id="adding-aggregators"></a><a href="#adding-aggregators" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Adding Aggregators</h3>
+<p>Adding AggregatorFactory objects is very similar to InputSource objects.  They operate purely through Jackson and thus should just be additions to the Jackson modules returned by your DruidModule.</p>
+<h3><a class="anchor" aria-hidden="true" id="adding-complex-metrics"></a><a href="#adding-complex-metrics" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Adding Complex Metrics</h3>
+<p>Adding ComplexMetrics is a little ugly in the current version.  The method of getting at complex metrics is through registration with the <code>ComplexMetrics.registerSerde()</code> method.  There is no special Guice stuff to get this working, just in your <code>configure(Binder)</code> method register the serialization/deserialization.</p>
+<h3><a class="anchor" aria-hidden="true" id="adding-new-query-types"></a><a href="#adding-new-query-types" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Adding new Query types</h3>
+<p>Adding a new Query type requires the implementation of three interfaces.</p>
+<ol>
+<li><code>org.apache.druid.query.Query</code></li>
+<li><code>org.apache.druid.query.QueryToolChest</code></li>
+<li><code>org.apache.druid.query.QueryRunnerFactory</code></li>
+</ol>
+<p>Registering these uses the same general strategy as a deep storage mechanism does.  You do something like</p>
+<pre><code class="hljs css language-java">DruidBinders.queryToolChestBinder(binder)
+            .addBinding(SegmentMetadataQuery<span class="hljs-class">.<span class="hljs-keyword">class</span>)
+            .<span class="hljs-title">to</span>(<span class="hljs-title">SegmentMetadataQueryQueryToolChest</span>.<span class="hljs-title">class</span>)</span>;
+
+DruidBinders.queryRunnerFactoryBinder(binder)
+            .addBinding(SegmentMetadataQuery<span class="hljs-class">.<span class="hljs-keyword">class</span>)
+            .<span class="hljs-title">to</span>(<span class="hljs-title">SegmentMetadataQueryRunnerFactory</span>.<span class="hljs-title">class</span>)</span>;
+</code></pre>
+<p>The first one binds the SegmentMetadataQueryQueryToolChest for usage when a SegmentMetadataQuery is used.  The second one does the same thing but for the QueryRunnerFactory instead.</p>
+<h3><a class="anchor" aria-hidden="true" id="adding-new-jersey-resources"></a><a href="#adding-new-jersey-resources" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Adding new Jersey resources</h3>
+<p>Adding new Jersey resources to a module requires calling the following code to bind the resource in the module:</p>
+<pre><code class="hljs css language-java">Jerseys.addResource(binder, NewResource<span class="hljs-class">.<span class="hljs-keyword">class</span>)</span>;
+</code></pre>
+<h3><a class="anchor" aria-hidden="true" id="adding-a-new-password-provider-implementation"></a><a href="#adding-a-new-password-provider-implementation" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Adding a new Password Provider implementation</h3>
+<p>You will need to implement <code>org.apache.druid.metadata.PasswordProvider</code> interface. For every place where Druid uses PasswordProvider, a new instance of the implementation will be created,
+thus make sure all the necessary information required for fetching each password is supplied during object instantiation.
+In your implementation of <code>org.apache.druid.initialization.DruidModule</code>, <code>getJacksonModules</code> should look something like this -</p>
+<pre><code class="hljs css language-java">    return ImmutableList.of(
+        new SimpleModule("SomePasswordProviderModule")
+            .registerSubtypes(
+                new NamedType(SomePasswordProvider.class, "some")
+            )
+    );
+</code></pre>
+<p>where <code>SomePasswordProvider</code> is the implementation of <code>PasswordProvider</code> interface, you can have a look at <code>org.apache.druid.metadata.EnvironmentVariablePasswordProvider</code> for example.</p>
+<h3><a class="anchor" aria-hidden="true" id="adding-a-transform-extension"></a><a href="#adding-a-transform-extension" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Adding a Transform Extension</h3>
+<p>To create a transform extension implement the <code>org.apache.druid.segment.transform.Transform</code> interface. You'll need to install the <code>druid-processing</code> package to import <code>org.apache.druid.segment.transform</code>.</p>
+<pre><code class="hljs css language-java"><span class="hljs-keyword">import</span> com.fasterxml.jackson.annotation.JsonCreator;
+<span class="hljs-keyword">import</span> com.fasterxml.jackson.annotation.JsonProperty;
+<span class="hljs-keyword">import</span> org.apache.druid.segment.transform.RowFunction;
+<span class="hljs-keyword">import</span> org.apache.druid.segment.transform.Transform;
+
+<span class="hljs-keyword">public</span> <span class="hljs-class"><span class="hljs-keyword">class</span> <span class="hljs-title">MyTransform</span> <span class="hljs-keyword">implements</span> <span class="hljs-title">Transform</span> </span>{
+    <span class="hljs-keyword">private</span> <span class="hljs-keyword">final</span> String name;
+
+    <span class="hljs-meta">@JsonCreator</span>
+    <span class="hljs-function"><span class="hljs-keyword">public</span> <span class="hljs-title">MyTransform</span><span class="hljs-params">(
+        @JsonProperty(<span class="hljs-string">"name"</span>)</span> <span class="hljs-keyword">final</span> String name
+    ) </span>{
+        <span class="hljs-keyword">this</span>.name = name;
+    }
+
+    <span class="hljs-meta">@JsonProperty</span>
+    <span class="hljs-meta">@Override</span>
+    <span class="hljs-function"><span class="hljs-keyword">public</span> String <span class="hljs-title">getName</span><span class="hljs-params">()</span> </span>{
+        <span class="hljs-keyword">return</span> name;
+    }
+
+    <span class="hljs-meta">@Override</span>
+    <span class="hljs-function"><span class="hljs-keyword">public</span> RowFunction <span class="hljs-title">getRowFunction</span><span class="hljs-params">()</span> </span>{
+        <span class="hljs-keyword">return</span> <span class="hljs-keyword">new</span> MyRowFunction();
+    }
+
+    <span class="hljs-keyword">static</span> <span class="hljs-class"><span class="hljs-keyword">class</span> <span class="hljs-title">MyRowFunction</span> <span class="hljs-keyword">implements</span> <span class="hljs-title">RowFunction</span> </span>{
+        <span class="hljs-meta">@Override</span>
+        <span class="hljs-function"><span class="hljs-keyword">public</span> Object <span class="hljs-title">eval</span><span class="hljs-params">(Row row)</span> </span>{
+            <span class="hljs-keyword">return</span> <span class="hljs-string">"transformed-value"</span>;
+        }
+    }
+}
+</code></pre>
+<p>Then register your transform as a Jackson module.</p>
+<pre><code class="hljs css language-java">import com.fasterxml.jackson.databind.Module;
+import com.fasterxml.jackson.databind.jsontype.NamedModule;
+import com.fasterxml.jackson.databind.module.SimpleModule;
+import com.google.inject.Binder;
+import com.google.common.collect.ImmutableList;
+import org.apache.druid.initialization.DruidModule;
+
+public class MyTransformModule implements DruidModule {
+    @Override
+    public List&lt;? extends Module&gt; getJacksonModules() {
+        return return ImmutableList.of(
+            new SimpleModule("MyTransformModule").registerSubtypes(
+                new NamedType(MyTransform.class, "my-transform")
+            )
+        ):
+    }
+
+    @Override
+    public void configure(Binder binder) {
+    }
+}
+</code></pre>
+<h3><a class="anchor" aria-hidden="true" id="bundle-your-extension-with-all-the-other-druid-extensions"></a><a href="#bundle-your-extension-with-all-the-other-druid-extensions" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Bundle your extension with all the other Druid extensions</h3>
+<p>When you do <code>mvn install</code>, Druid extensions will be packaged within the Druid tarball and <code>extensions</code> directory, which are both underneath <code>distribution/target/</code>.</p>
+<p>If you want your extension to be included, you can add your extension's maven coordinate as an argument at
+<a href="https://github.com/apache/druid/blob/master/distribution/pom.xml#L95">distribution/pom.xml</a></p>
+<p>During <code>mvn install</code>, maven will install your extension to the local maven repository, and then call <a href="/docs/0.20.0/operations/pull-deps.html">pull-deps</a> to pull your extension from
+there. In the end, you should see your extension underneath <code>distribution/target/extensions</code> and within Druid tarball.</p>
+<h3><a class="anchor" aria-hidden="true" id="managing-dependencies"></a><a href="#managing-dependencies" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Managing dependencies</h3>
+<p>Managing library collisions can be daunting for extensions which draw in commonly used libraries. Here is a list of group IDs for libraries that are suggested to be specified with a <code>provided</code> scope to prevent collision with versions used in druid:</p>
+<pre><code class="hljs">"<span class="hljs-selector-tag">org</span><span class="hljs-selector-class">.apache</span><span class="hljs-selector-class">.druid</span>",
+"<span class="hljs-selector-tag">com</span><span class="hljs-selector-class">.metamx</span><span class="hljs-selector-class">.druid</span>",
+"<span class="hljs-selector-tag">asm</span>",
+"<span class="hljs-selector-tag">org</span><span class="hljs-selector-class">.ow2</span><span class="hljs-selector-class">.asm</span>",
+"<span class="hljs-selector-tag">org</span><span class="hljs-selector-class">.jboss</span><span class="hljs-selector-class">.netty</span>",
+"<span class="hljs-selector-tag">com</span><span class="hljs-selector-class">.google</span><span class="hljs-selector-class">.guava</span>",
+"<span class="hljs-selector-tag">com</span><span class="hljs-selector-class">.google</span><span class="hljs-selector-class">.code</span><span class="hljs-selector-class">.findbugs</span>",
+"<span class="hljs-selector-tag">com</span><span class="hljs-selector-class">.google</span><span class="hljs-selector-class">.protobuf</span>",
+"<span class="hljs-selector-tag">com</span><span class="hljs-selector-class">.esotericsoftware</span><span class="hljs-selector-class">.minlog</span>",
+"<span class="hljs-selector-tag">log4j</span>",
+"<span class="hljs-selector-tag">org</span><span class="hljs-selector-class">.slf4j</span>",
+"<span class="hljs-selector-tag">commons-logging</span>",
+"<span class="hljs-selector-tag">org</span><span class="hljs-selector-class">.eclipse</span><span class="hljs-selector-class">.jetty</span>",
+"<span class="hljs-selector-tag">org</span><span class="hljs-selector-class">.mortbay</span><span class="hljs-selector-class">.jetty</span>",
+"<span class="hljs-selector-tag">com</span><span class="hljs-selector-class">.sun</span><span class="hljs-selector-class">.jersey</span>",
+"<span class="hljs-selector-tag">com</span><span class="hljs-selector-class">.sun</span><span class="hljs-selector-class">.jersey</span><span class="hljs-selector-class">.contribs</span>",
+"<span class="hljs-selector-tag">common-beanutils</span>",
+"<span class="hljs-selector-tag">commons-codec</span>",
+"<span class="hljs-selector-tag">commons-lang</span>",
+"<span class="hljs-selector-tag">commons-cli</span>",
+"<span class="hljs-selector-tag">commons-io</span>",
+"<span class="hljs-selector-tag">javax</span><span class="hljs-selector-class">.activation</span>",
+"<span class="hljs-selector-tag">org</span><span class="hljs-selector-class">.apache</span><span class="hljs-selector-class">.httpcomponents</span>",
+"<span class="hljs-selector-tag">org</span><span class="hljs-selector-class">.apache</span><span class="hljs-selector-class">.zookeeper</span>",
+"<span class="hljs-selector-tag">org</span><span class="hljs-selector-class">.codehaus</span><span class="hljs-selector-class">.jackson</span>",
+"<span class="hljs-selector-tag">com</span><span class="hljs-selector-class">.fasterxml</span><span class="hljs-selector-class">.jackson</span>",
+"<span class="hljs-selector-tag">com</span><span class="hljs-selector-class">.fasterxml</span><span class="hljs-selector-class">.jackson</span><span class="hljs-selector-class">.core</span>",
+"<span class="hljs-selector-tag">com</span><span class="hljs-selector-class">.fasterxml</span><span class="hljs-selector-class">.jackson</span><span class="hljs-selector-class">.dataformat</span>",
+"<span class="hljs-selector-tag">com</span><span class="hljs-selector-class">.fasterxml</span><span class="hljs-selector-class">.jackson</span><span class="hljs-selector-class">.datatype</span>",
+"<span class="hljs-selector-tag">org</span><span class="hljs-selector-class">.roaringbitmap</span>",
+"<span class="hljs-selector-tag">net</span><span class="hljs-selector-class">.java</span><span class="hljs-selector-class">.dev</span><span class="hljs-selector-class">.jets3t</span>"
+</code></pre>
+<p>See the documentation in <code>org.apache.druid.cli.PullDependencies</code> for more information.</p>
+</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/0.20.0/development/overview.html"><span class="arrow-prev">← </span><span>Developing on Druid</span></a><a class="docs-next button" href="/docs/0.20.0/development/javascript.html"><span class="function-name-prevnext">JavaScript functionality</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#writing-your-own-extensions">Writing your own extensions</a><ul class="toc-headings"><li><a href="#creating-a-druid-module">Creating a Druid Module</a></li><li><a href="#registering-your-druid-module">Registering your Druid Module</a></li><li><a href="#adding-a-new-deep-storage-implementation">Adding a new deep storage implementation</a></li><li><a href="#validating-your-deep-storage-implementation">Validating your deep storage implementation</a></li><li><a href="#adding-support-for-a-new-input-source">Adding support for a new input source</a></li><li><a href="#adding-support-for-a-new-data-format">Adding support for a new data format</a></li><li><a href="#adding-aggregators">Adding Aggregators</a></li><li><a href="#adding-complex-metrics">Adding Complex Metrics</a></li><li><a href="#adding-new-query-types">Adding new Query types</a></li><li><a href="#adding-new-jersey-resources">Adding new Jersey resources</a></li><li><a href="#adding-a-new-password-provider-implementation">Adding a new Password Provider implementation</a></li><li><a href="#adding-a-transform-extension">Adding a Transform Extension</a></li><li><a href="#bundle-your-extension-with-all-the-other-druid-extensions">Bundle your extension with all the other Druid extensions</a></li><li><a href="#managing-dependencies">Managing dependencies</a></li></ul></li></ul></nav></div><footer class="nav-footer druid-footer" id="footer"><div class="container"><div class="text-center"><p><a href="/technology">Technology</a> · <a href="/use-cases">Use Cases</a> · <a href="/druid-powered">Powered by Druid</a> · <a href="/docs/0.20.0/latest">Docs</a> · <a href="/community/">Community</a> · <a href="/downloads.html">Download</a> · <a href="/faq">FAQ</a></p></div><div class="text-center"><a title="Join the user group" href="https://groups.google.com/forum/#!forum/druid-user" target="_blank"><span class="fa fa-comments"></span></a> · <a title="Follow Druid" href="https://twitter.com/druidio" target="_blank"><span class="fab fa-twitter"></span></a> · <a title="Download via Apache" href="https://www.apache.org/dyn/closer.cgi?path=/incubator/druid/{{ site.druid_versions[0].versions[0].version }}/apache-druid-{{ site.druid_versions[0].versions[0].version }}-bin.tar.gz" target="_blank"><span class="fas fa-feather"></span></a> · <a title="GitHub" href="https://github.com/apache/druid" target="_blank"><span class="fab fa-github"></span></a></div><div class="text-center license">Copyright © 2019 <a href="https://www.apache.org/" target="_blank">Apache Software Foundation</a>.<br/>Except where otherwise noted, licensed under <a rel="license" href="http://creativecommons.org/licenses/by-sa/4.0/">CC BY-SA 4.0</a>.<br/>Apache Druid, Druid, and the Druid logo are either registered trademarks or trademarks of The Apache Software Foundation in the United States and other countries.</div></div></footer></div><script type="text/javascript" src="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.js"></script><script>
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+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Developing on Apache Druid · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/0.20.0/development/overview.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.20.0" /><meta property="og:title" content="Developing on Apache Druid · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
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UIs</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/operations/deep-storage-migration.html">Deep storage migration</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/operations/export-metadata.html">Export Metadata Tool</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/operations/metadata-migration.html">Metadata Migration</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/operations/segment-optimization.html">Segment Size Optimization</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/operations/use_sbt_to_build_fat_jar.html">Content for build.sbt</a></li></ul></div></ul></div><div class="navGroup"><h3 class="navGroupCategoryTitle collapsible">Development<span class="arrow"><svg width="24" height="24" viewBox="0 0 24 24"><path fill="#565656" d="M7.41 15.41L12 10.83l4.59 4.58L18 14l-6-6-6 6z"></path><path d="M0 0h24v24H0z" fill="none"></path></svg></span></h3><ul class="hide"><li 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+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
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+<p>Druid's codebase consists of several major components. For developers interested in learning the code, this document provides
+a high level overview of the main components that make up Druid and the relevant classes to start from to learn the code.</p>
+<h2><a class="anchor" aria-hidden="true" id="storage-format"></a><a href="#storage-format" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Storage format</h2>
+<p>Data in Druid is stored in a custom column format known as a <a href="/docs/0.20.0/design/segments.html">segment</a>. Segments are composed of
+different types of columns. <code>Column.java</code> and the classes that extend it is a great place to looking into the storage format.</p>
+<h2><a class="anchor" aria-hidden="true" id="segment-creation"></a><a href="#segment-creation" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Segment creation</h2>
+<p>Raw data is ingested in <code>IncrementalIndex.java</code>, and segments are created in <code>IndexMerger.java</code>.</p>
+<h2><a class="anchor" aria-hidden="true" id="storage-engine"></a><a href="#storage-engine" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Storage engine</h2>
+<p>Druid segments are memory mapped in <code>IndexIO.java</code> to be exposed for querying.</p>
+<h2><a class="anchor" aria-hidden="true" id="query-engine"></a><a href="#query-engine" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Query engine</h2>
+<p>Most of the logic related to Druid queries can be found in the Query* classes. Druid leverages query runners to run queries.
+Query runners often embed other query runners and each query runner adds on a layer of logic. A good starting point to trace
+the query logic is to start from <code>QueryResource.java</code>.</p>
+<h2><a class="anchor" aria-hidden="true" id="coordination"></a><a href="#coordination" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Coordination</h2>
+<p>Most of the coordination logic for Historical processes is on the Druid Coordinator. The starting point here is <code>DruidCoordinator.java</code>.
+Most of the coordination logic for (real-time) ingestion is in the Druid indexing service. The starting point here is <code>OverlordResource.java</code>.</p>
+<h2><a class="anchor" aria-hidden="true" id="real-time-ingestion"></a><a href="#real-time-ingestion" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Real-time Ingestion</h2>
+<p>Druid loads data through <code>FirehoseFactory.java</code> classes. Firehoses often wrap other firehoses, where, similar to the design of the
+query runners, each firehose adds a layer of logic, and the persist and hand-off logic is in <code>RealtimePlumber.java</code>.</p>
+<h2><a class="anchor" aria-hidden="true" id="hadoop-based-batch-ingestion"></a><a href="#hadoop-based-batch-ingestion" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Hadoop-based Batch Ingestion</h2>
+<p>The two main Hadoop indexing classes are <code>HadoopDruidDetermineConfigurationJob.java</code> for the job to determine how many Druid
+segments to create, and <code>HadoopDruidIndexerJob.java</code>, which creates Druid segments.</p>
+<p>At some point in the future, we may move the Hadoop ingestion code out of core Druid.</p>
+<h2><a class="anchor" aria-hidden="true" id="internal-uis"></a><a href="#internal-uis" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Internal UIs</h2>
+<p>Druid currently has two internal UIs. One is for the Coordinator and one is for the Overlord.</p>
+<p>At some point in the future, we will likely move the internal UI code out of core Druid.</p>
+<h2><a class="anchor" aria-hidden="true" id="client-libraries"></a><a href="#client-libraries" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Client libraries</h2>
+<p>We welcome contributions for new client libraries to interact with Druid. See the
+<a href="https://druid.apache.org/libraries.html">Community and third-party libraries</a> page for links to existing client
+libraries.</p>
+</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/0.20.0/operations/use_sbt_to_build_fat_jar.html"><span class="arrow-prev">← </span><span>Content for build.sbt</span></a><a class="docs-next button" href="/docs/0.20.0/development/modules.html"><span>Creating extensions</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#storage-format">Storage format</a></li><li><a href="#segment-creation">Segment creation</a></li><li><a href="#storage-engine">Storage engine</a></li><li><a href="#query-engine">Query engine</a></li><li><a href="#coordination">Coordination</a></li><li><a href="#real-time-ingestion">Real-time Ingestion</a></li><li><a href="#hadoop-based-batch-ingestion">Hadoop-based Batch Ingestion</a></li><li><a href="#internal-uis">Internal UIs</a></li><li><a href="#client-libraries">Client libraries</a></li></ul></nav></div><footer class="nav-footer druid-footer" id="footer"><div class="container"><div class="text-center"><p><a href="/technology">Technology</a> · <a href="/use-cases">Use Cases</a> · <a href="/druid-powered">Powered by Druid</a> · <a href="/docs/0.20.0/latest">Docs</a> · <a href="/community/">Community</a> · <a href="/downloads.html">Download</a> · <a href="/faq">FAQ</a></p></div><div class="text-center"><a title="Join the user group" href="https://groups.google.com/forum/#!forum/druid-user" target="_blank"><span class="fa fa-comments"></span></a> · <a title="Follow Druid" href="https://twitter.com/druidio" target="_blank"><span class="fab fa-twitter"></span></a> · <a title="Download via Apache" href="https://www.apache.org/dyn/closer.cgi?path=/incubator/druid/{{ site.druid_versions[0].versions[0].version }}/apache-druid-{{ site.druid_versions[0].versions[0].version }}-bin.tar.gz" target="_blank"><span class="fas fa-feather"></span></a> · <a title="GitHub" href="https://github.com/apache/druid" target="_blank"><span class="fab fa-github"></span></a></div><div class="text-center license">Copyright © 2019 <a href="https://www.apache.org/" target="_blank">Apache Software Foundation</a>.<br/>Except where otherwise noted, licensed under <a rel="license" href="http://creativecommons.org/licenses/by-sa/4.0/">CC BY-SA 4.0</a>.<br/>Apache Druid, Druid, and the Druid logo are either registered trademarks or trademarks of The Apache Software Foundation in the United States and other countries.</div></div></footer></div><script type="text/javascript" src="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.js"></script><script>
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+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
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+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
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+<p>This page discusses how we do versioning and provides information on our stable releases.</p>
+<h2><a class="anchor" aria-hidden="true" id="versioning-strategy"></a><a href="#versioning-strategy" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Versioning Strategy</h2>
+<p>We generally follow <a href="http://semver.org/">semantic versioning</a>. The general idea is</p>
+<ul>
+<li>&quot;Major&quot; version (leftmost): backwards incompatible, no guarantees exist about APIs between the versions</li>
+<li>&quot;Minor&quot; version (middle number): you can move forward from a smaller number to a larger number, but moving backwards <em>might</em> be incompatible.</li>
+<li>&quot;bug-fix&quot; version (&quot;patch&quot; or the rightmost): Interchangeable. The higher the number, the more things are fixed (hopefully), but the programming interfaces are completely compatible and you should be able to just drop in a new jar and have it work.</li>
+</ul>
+<p>Note that this is defined in terms of programming API, <strong>not</strong> in terms of functionality. It is possible that a brand new awesome way of doing something is introduced in a &quot;bug-fix&quot; release version if it doesn’t add to the public API or change it.</p>
+<p>One exception for right now, while we are still in major version 0, we are considering the APIs to be in beta and are conflating &quot;major&quot; and &quot;minor&quot; so a minor version increase could be backwards incompatible for as long as we are at major version 0. These will be communicated via email on the group.</p>
+<p>For external deployments, we recommend running the stable release tag. Releases are considered stable after we have deployed them into our production environment and they have operated bug-free for some time.</p>
+<h2><a class="anchor" aria-hidden="true" id="tagging-strategy"></a><a href="#tagging-strategy" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Tagging strategy</h2>
+<p>Tags of the codebase are equivalent to release candidates. We tag the code every time we want to take it through our release process, which includes some QA cycles and deployments. So, it is not safe to assume that a tag is a stable release, it is a solidification of the code as it goes through our production QA cycle and deployment. Tags will never change, but we often go through a number of iterations of tags before actually getting a stable release onto production. So, it is recommended that if you are not aware of what is on a tag, to stick to the stable releases listed on the <a href="https://github.com/apache/druid/releases">Release</a> page.</p>
+</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/0.20.0/development/build.html"><span class="arrow-prev">← </span><span>Build from source</span></a><a class="docs-next button" href="/docs/0.20.0/development/experimental.html"><span>Experimental features</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#versioning-strategy">Versioning Strategy</a></li><li><a href="#tagging-strategy">Tagging strategy</a></li></ul></nav></div><footer class="nav-footer druid-footer" id="footer"><div class="container"><div class="text-center"><p><a href="/technology">Technology</a> · <a href="/use-cases">Use Cases</a> · <a href="/druid-powered">Powered by Druid</a> · <a href="/docs/0.20.0/latest">Docs</a> · <a href="/community/">Community</a> · <a href="/downloads.html">Download</a> · <a href="/faq">FAQ</a></p></div><div class="text-center"><a title="Join the user group" href="https://groups.google.com/forum/#!forum/druid-user" target="_blank"><span class="fa fa-comments"></span></a> · <a title="Follow Druid" href="https://twitter.com/druidio" target="_blank"><span class="fab fa-twitter"></span></a> · <a title="Download via Apache" href="https://www.apache.org/dyn/closer.cgi?path=/incubator/druid/{{ site.druid_versions[0].versions[0].version }}/apache-druid-{{ site.druid_versions[0].versions[0].version }}-bin.tar.gz" target="_blank"><span class="fas fa-feather"></span></a> · <a title="GitHub" href="https://github.com/apache/druid" target="_blank"><span class="fab fa-github"></span></a></div><div class="text-center license">Copyright © 2019 <a href="https://www.apache.org/" target="_blank">Apache Software Foundation</a>.<br/>Except where otherwise noted, licensed under <a rel="license" href="http://creativecommons.org/licenses/by-sa/4.0/">CC BY-SA 4.0</a>.<br/>Apache Druid, Druid, and the Druid logo are either registered trademarks or trademarks of The Apache Software Foundation in the United States and other countries.</div></div></footer></div><script type="text/javascript" src="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.js"></script><script>
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class="icon-toc"></i></div></div><div class="navGroups"><div class="navGroup"><h3 class="navGroupCategoryTitle collapsible">Getting started<span class="arrow"><svg width="24" height="24" viewBox="0 0 24 24"><path fill="#565656" d="M7.41 15.41L12 10.83l4.59 4.58L18 14l-6-6-6 6z"></path><path d="M0 0h24v24H0z" fill="none"></path></svg></span></h3><ul class="hide"><li class="navListItem"><a class="navItem" href="/docs/0.20.0/design/index.html">Introduction to Apache Druid</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/tutorials/index.html">Quickstart</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/tutorials/docker.html">Docker</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/operations/single-server.html">Single server deployment</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/tutorials/cluster.html">Clustered deployment</a></li></ul></div><div class="navGroup"><h3 class="navGroupCategoryTitle 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href="/docs/0.20.0/ingestion/tranquility.html">Tranquility</a></li></ul></div><div class="navGroup subNavGroup"><h4 class="navGroupSubcategoryTitle">Batch ingestion</h4><ul><li class="navListItem"><a class="navItem" href="/docs/0.20.0/ingestion/native-batch.html">Native batch</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/ingestion/hadoop.html">Hadoop-based</a></li></ul></div><li class="navListItem"><a class="navItem" href="/docs/0.20.0/ingestion/tasks.html">Task reference</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/ingestion/faq.html">Troubleshooting FAQ</a></li></ul></div><div class="navGroup"><h3 class="navGroupCategoryTitle collapsible">Querying<span class="arrow"><svg width="24" height="24" viewBox="0 0 24 24"><path fill="#565656" d="M7.41 15.41L12 10.83l4.59 4.58L18 14l-6-6-6 6z"></path><path d="M0 0h24v24H0z" fill="none"></path></svg></span></h3><ul class="hide"><li class="navListItem"><a class="navItem" href="/docs/0.20.0/querying/sql.html">Druid SQL</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/querying/querying.html">Native queries</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/querying/query-execution.html">Query execution</a></li><div class="navGroup subNavGroup"><h4 class="navGroupSubcategoryTitle">Concepts</h4><ul><li class="navListItem"><a class="navItem" href="/docs/0.20.0/querying/datasource.html">Datasources</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/querying/joins.html">Joins</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/querying/lookups.html">Lookups</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/querying/multi-value-dimensions.html">Multi-value dimensions</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/querying/multitenancy.html">Multitenancy</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/querying/caching.html">Query caching</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/querying/query-context.html">Context parameters</a></li></ul></div><div class="navGroup subNavGroup"><h4 class="navGroupSubcategoryTitle">Native query types</h4><ul><li class="navListItem"><a class="navItem" href="/docs/0.20.0/querying/timeseriesquery.html">Timeseries</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/querying/topnquery.html">TopN</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/querying/groupbyquery.html">GroupBy</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/querying/scan-query.html">Scan</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/querying/searchquery.html">Search</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/querying/timeboundaryquery.html">TimeBoundary</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/querying/segmentmetadataquery.html">SegmentMetadata</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/querying/datasourcemetadataquery.html">DatasourceMetadata</a></li></ul></div><div class="navGroup subNavGroup"><h4 class="navGroupSubcategoryTitle">Native query components</h4><ul><li class="navListItem"><a class="navItem" href="/docs/0.20.0/querying/filters.html">Filters</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/querying/granularities.html">Granularities</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/querying/dimensionspecs.html">Dimensions</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/querying/aggregations.html">Aggregations</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/querying/post-aggregations.html">Post-aggregations</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/misc/math-expr.html">Expressions</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/querying/having.html">Having filters (groupBy)</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/querying/limitspec.html">Sorting and limiting (groupBy)</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/querying/topnmetricspec.html">Sorting (topN)</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/querying/sorting-orders.html">String comparators</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/querying/virtual-columns.html">Virtual columns</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/geo.html">Spatial filters</a></li></ul></div></ul></div><div class="navGroup"><h3 class="navGroupCategoryTitle collapsible">Configuration<span class="arrow"><svg width="24" height="24" viewBox="0 0 24 24"><path fill="#565656" d="M7.41 15.41L12 10.83l4.59 4.58L18 14l-6-6-6 6z"></path><path d="M0 0h24v24H0z" fill="none"></path></svg></span></h3><ul class="hide"><li class="navListItem"><a class="navItem" href="/docs/0.20.0/configuration/index.html">Configuration reference</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions.html">Extensions</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/configuration/logging.html">Logging</a></li></ul></div><div class="navGroup"><h3 class="navGroupCategoryTitle collapsible">Operations<span class="arrow"><svg width="24" height="24" viewBox="0 0 24 24"><path fill="#565656" d="M7.41 15.41L12 10.83l4.59 4.58L18 14l-6-6-6 6z"></path><path d="M0 0h24v24H0z" fill="none"></path></svg></span></h3><ul class="hide"><li class="navListItem"><a class="navItem" href="/docs/0.20.0/operations/druid-console.html">Web console</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/operations/getting-started.html">Getting started with Apache Druid</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/operations/basic-cluster-tuning.html">Basic cluster tuning</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/operations/api-reference.html">API reference</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/operations/high-availability.html">High availability</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/operations/rolling-updates.html">Rolling updates</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/operations/rule-configuration.html">Retaining or automatically dropping data</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/operations/metrics.html">Metrics</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/operations/alerts.html">Alerts</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/operations/other-hadoop.html">Working with different versions of Apache Hadoop</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/operations/http-compression.html">HTTP compression</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/operations/tls-support.html">TLS support</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/operations/password-provider.html">Password providers</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/operations/dump-segment.html">dump-segment tool</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/operations/reset-cluster.html">reset-cluster tool</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/operations/insert-segment-to-db.html">insert-segment-to-db tool</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/operations/pull-deps.html">pull-deps tool</a></li><div class="navGroup subNavGroup"><h4 class="navGroupSubcategoryTitle">Misc</h4><ul><li class="navListItem"><a class="navItem" href="/docs/0.20.0/operations/management-uis.html">Legacy Management UIs</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/operations/deep-storage-migration.html">Deep storage migration</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/operations/export-metadata.html">Export Metadata Tool</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/operations/metadata-migration.html">Metadata Migration</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/operations/segment-optimization.html">Segment Size Optimization</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/operations/use_sbt_to_build_fat_jar.html">Content for build.sbt</a></li></ul></div></ul></div><div class="navGroup"><h3 class="navGroupCategoryTitle collapsible">Development<span class="arrow"><svg width="24" height="24" viewBox="0 0 24 24"><path fill="#565656" d="M7.41 15.41L12 10.83l4.59 4.58L18 14l-6-6-6 6z"></path><path d="M0 0h24v24H0z" fill="none"></path></svg></span></h3><ul class="hide"><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/overview.html">Developing on Druid</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/modules.html">Creating extensions</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/javascript.html">JavaScript functionality</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/build.html">Build from source</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/versioning.html">Versioning</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/experimental.html">Experimental features</a></li></ul></div><div class="navGroup"><h3 class="navGroupCategoryTitle collapsible">Misc<span class="arrow"><svg width="24" height="24" viewBox="0 0 24 24"><path fill="#565656" d="M7.41 15.41L12 10.83l4.59 4.58L18 14l-6-6-6 6z"></path><path d="M0 0h24v24H0z" fill="none"></path></svg></span></h3><ul class="hide"><li class="navListItem"><a class="navItem" href="/docs/0.20.0/misc/papers-and-talks.html">Papers</a></li></ul></div><div class="navGroup"><h3 class="navGroupCategoryTitle collapsible">Hidden<span class="arrow"><svg width="24" height="24" viewBox="0 0 24 24"><path fill="#565656" d="M7.41 15.41L12 10.83l4.59 4.58L18 14l-6-6-6 6z"></path><path d="M0 0h24v24H0z" fill="none"></path></svg></span></h3><ul class="hide"><li class="navListItem"><a class="navItem" href="/docs/0.20.0/comparisons/druid-vs-elasticsearch.html">Apache Druid vs Elasticsearch</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/comparisons/druid-vs-key-value.html">Apache Druid vs. Key/Value Stores (HBase/Cassandra/OpenTSDB)</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/comparisons/druid-vs-kudu.html">Apache Druid vs Kudu</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/comparisons/druid-vs-redshift.html">Apache Druid vs Redshift</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/comparisons/druid-vs-spark.html">Apache Druid vs Spark</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/comparisons/druid-vs-sql-on-hadoop.html">Apache Druid vs SQL-on-Hadoop</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/design/auth.html">Authentication and Authorization</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/design/broker.html">Broker</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/design/coordinator.html">Coordinator Process</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/design/historical.html">Historical Process</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/design/indexer.html">Indexer Process</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/design/indexing-service.html">Indexing Service</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/design/middlemanager.html">MiddleManager Process</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/design/overlord.html">Overlord Process</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/design/router.html">Router Process</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/design/peons.html">Peons</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-core/approximate-histograms.html">Approximate Histogram aggregators</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-core/avro.html">Apache Avro</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-core/azure.html">Microsoft Azure</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-core/bloom-filter.html">Bloom Filter</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-core/datasketches-extension.html">DataSketches extension</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-core/datasketches-hll.html">DataSketches HLL Sketch module</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-core/datasketches-quantiles.html">DataSketches Quantiles Sketch module</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-core/datasketches-theta.html">DataSketches Theta Sketch module</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-core/datasketches-tuple.html">DataSketches Tuple Sketch module</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-core/druid-basic-security.html">Basic Security</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-core/druid-kerberos.html">Kerberos</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-core/druid-lookups.html">Cached Lookup Module</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-core/druid-ranger-security.html">Apache Ranger Security</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-core/google.html">Google Cloud Storage</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-core/hdfs.html">HDFS</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-core/kafka-extraction-namespace.html">Apache Kafka Lookups</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-core/lookups-cached-global.html">Globally Cached Lookups</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-core/mysql.html">MySQL Metadata Store</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-core/orc.html">ORC Extension</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-core/druid-pac4j.html">Druid pac4j based Security extension</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-core/parquet.html">Apache Parquet Extension</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-core/postgresql.html">PostgreSQL Metadata Store</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-core/protobuf.html">Protobuf</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-core/s3.html">S3-compatible</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-core/simple-client-sslcontext.html">Simple SSLContext Provider Module</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-core/stats.html">Stats aggregator</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-core/test-stats.html">Test Stats Aggregators</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-contrib/ambari-metrics-emitter.html">Ambari Metrics Emitter</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-contrib/cassandra.html">Apache Cassandra</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-contrib/cloudfiles.html">Rackspace Cloud Files</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-contrib/distinctcount.html">DistinctCount Aggregator</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-contrib/graphite.html">Graphite Emitter</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-contrib/influx.html">InfluxDB Line Protocol Parser</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-contrib/influxdb-emitter.html">InfluxDB Emitter</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-contrib/kafka-emitter.html">Kafka Emitter</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-contrib/materialized-view.html">Materialized View</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-contrib/momentsketch-quantiles.html">Moment Sketches for Approximate Quantiles module</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-contrib/moving-average-query.html">Moving Average Query</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-contrib/opentsdb-emitter.html">OpenTSDB Emitter</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-contrib/redis-cache.html">Druid Redis Cache</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-contrib/sqlserver.html">Microsoft SQLServer</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-contrib/statsd.html">StatsD Emitter</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-contrib/tdigestsketch-quantiles.html">T-Digest Quantiles Sketch module</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-contrib/thrift.html">Thrift</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-contrib/time-min-max.html">Timestamp Min/Max aggregators</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-contrib/gce-extensions.html">GCE Extensions</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-contrib/aliyun-oss.html">Aliyun OSS</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/querying/hll-old.html">Cardinality/HyperUnique aggregators</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/querying/select-query.html">Select</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/ingestion/standalone-realtime.html">Realtime Process</a></li></ul></div></div></section></div><script>
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+  ~ or more contributor license agreements.  See the NOTICE file
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+<p>Apache Druid can ingest denormalized data in JSON, CSV, or a delimited form such as TSV, or any custom format. While most examples in the documentation use data in JSON format, it is not difficult to configure Druid to ingest any other delimited data.
+We welcome any contributions to new formats.</p>
+<p>This page lists all default and core extension data formats supported by Druid.
+For additional data formats supported with community extensions,
+please see our <a href="/docs/0.20.0/development/extensions.html#community-extensions">community extensions list</a>.</p>
+<h2><a class="anchor" aria-hidden="true" id="formatting-the-data"></a><a href="#formatting-the-data" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Formatting the Data</h2>
+<p>The following samples show data formats that are natively supported in Druid:</p>
+<p><em>JSON</em></p>
+<pre><code class="hljs css language-json">{<span class="hljs-attr">"timestamp"</span>: <span class="hljs-string">"2013-08-31T01:02:33Z"</span>, <span class="hljs-attr">"page"</span>: <span class="hljs-string">"Gypsy Danger"</span>, <span class="hljs-attr">"language"</span> : <span class="hljs-string">"en"</span>, <span class="hljs-attr">"user"</span> : <span class="hljs-string">"nuclear"</span>, <span class="hljs-attr">"unpatrolled"</span> : <span class="hljs-string">"true"</span>, <span class="hljs-attr">"newPage"</span> : <span class="hljs-string">"true"</span>, <span class="hljs-attr">"robot"</span>: <span class="hljs-string">"false"</span>, <span class="hljs-attr">"anonymous"</span>: <span class="hljs-string">"false"</span>, <span class="hljs-attr">"namespace"</span>:<span class="hljs-string">"article"</span>, <span class="hljs-attr">"continent"</span>:<span class="hljs-string">"North America"</span>, <span class="hljs-attr">"country"</span>:<span class="hljs-string">"United States"</span>, <span class="hljs-attr">"region"</span>:<span class="hljs-string">"Bay Area"</span>, <span class="hljs-attr">"city"</span>:<span class="hljs-string">"San Francisco"</span>, <span class="hljs-attr">"added"</span>: <span class="hljs-number">57</span>, <span class="hljs-attr">"deleted"</span>: <span class="hljs-number">200</span>, <span class="hljs-attr">"delta"</span>: <span class="hljs-number">-143</span>}
+{<span class="hljs-attr">"timestamp"</span>: <span class="hljs-string">"2013-08-31T03:32:45Z"</span>, <span class="hljs-attr">"page"</span>: <span class="hljs-string">"Striker Eureka"</span>, <span class="hljs-attr">"language"</span> : <span class="hljs-string">"en"</span>, <span class="hljs-attr">"user"</span> : <span class="hljs-string">"speed"</span>, <span class="hljs-attr">"unpatrolled"</span> : <span class="hljs-string">"false"</span>, <span class="hljs-attr">"newPage"</span> : <span class="hljs-string">"true"</span>, <span class="hljs-attr">"robot"</span>: <span class="hljs-string">"true"</span>, <span class="hljs-attr">"anonymous"</span>: <span class="hljs-string">"false"</span>, <span class="hljs-attr">"namespace"</span>:<span class="hljs-string">"wikipedia"</span>, <span class="hljs-attr">"continent"</span>:<span class="hljs-string">"Australia"</span>, <span class="hljs-attr">"country"</span>:<span class="hljs-string">"Australia"</span>, <span class="hljs-attr">"region"</span>:<span class="hljs-string">"Cantebury"</span>, <span class="hljs-attr">"city"</span>:<span class="hljs-string">"Syndey"</span>, <span class="hljs-attr">"added"</span>: <span class="hljs-number">459</span>, <span class="hljs-attr">"deleted"</span>: <span class="hljs-number">129</span>, <span class="hljs-attr">"delta"</span>: <span class="hljs-number">330</span>}
+{<span class="hljs-attr">"timestamp"</span>: <span class="hljs-string">"2013-08-31T07:11:21Z"</span>, <span class="hljs-attr">"page"</span>: <span class="hljs-string">"Cherno Alpha"</span>, <span class="hljs-attr">"language"</span> : <span class="hljs-string">"ru"</span>, <span class="hljs-attr">"user"</span> : <span class="hljs-string">"masterYi"</span>, <span class="hljs-attr">"unpatrolled"</span> : <span class="hljs-string">"false"</span>, <span class="hljs-attr">"newPage"</span> : <span class="hljs-string">"true"</span>, <span class="hljs-attr">"robot"</span>: <span class="hljs-string">"true"</span>, <span class="hljs-attr">"anonymous"</span>: <span class="hljs-string">"false"</span>, <span class="hljs-attr">"namespace"</span>:<span class="hljs-string">"article"</span>, <span class="hljs-attr">"continent"</span>:<span class="hljs-string">"Asia"</span>, <span class="hljs-attr">"country"</span>:<span class="hljs-string">"Russia"</span>, <span class="hljs-attr">"region"</span>:<span class="hljs-string">"Oblast"</span>, <span class="hljs-attr">"city"</span>:<span class="hljs-string">"Moscow"</span>, <span class="hljs-attr">"added"</span>: <span class="hljs-number">123</span>, <span class="hljs-attr">"deleted"</span>: <span class="hljs-number">12</span>, <span class="hljs-attr">"delta"</span>: <span class="hljs-number">111</span>}
+{<span class="hljs-attr">"timestamp"</span>: <span class="hljs-string">"2013-08-31T11:58:39Z"</span>, <span class="hljs-attr">"page"</span>: <span class="hljs-string">"Crimson Typhoon"</span>, <span class="hljs-attr">"language"</span> : <span class="hljs-string">"zh"</span>, <span class="hljs-attr">"user"</span> : <span class="hljs-string">"triplets"</span>, <span class="hljs-attr">"unpatrolled"</span> : <span class="hljs-string">"true"</span>, <span class="hljs-attr">"newPage"</span> : <span class="hljs-string">"false"</span>, <span class="hljs-attr">"robot"</span>: <span class="hljs-string">"true"</span>, <span class="hljs-attr">"anonymous"</span>: <span class="hljs-string">"false"</span>, <span class="hljs-attr">"namespace"</span>:<span class="hljs-string">"wikipedia"</span>, <span class="hljs-attr">"continent"</span>:<span class="hljs-string">"Asia"</span>, <span class="hljs-attr">"country"</span>:<span class="hljs-string">"China"</span>, <span class="hljs-attr">"region"</span>:<span class="hljs-string">"Shanxi"</span>, <span class="hljs-attr">"city"</span>:<span class="hljs-string">"Taiyuan"</span>, <span class="hljs-attr">"added"</span>: <span class="hljs-number">905</span>, <span class="hljs-attr">"deleted"</span>: <span class="hljs-number">5</span>, <span class="hljs-attr">"delta"</span>: <span class="hljs-number">900</span>}
+{<span class="hljs-attr">"timestamp"</span>: <span class="hljs-string">"2013-08-31T12:41:27Z"</span>, <span class="hljs-attr">"page"</span>: <span class="hljs-string">"Coyote Tango"</span>, <span class="hljs-attr">"language"</span> : <span class="hljs-string">"ja"</span>, <span class="hljs-attr">"user"</span> : <span class="hljs-string">"cancer"</span>, <span class="hljs-attr">"unpatrolled"</span> : <span class="hljs-string">"true"</span>, <span class="hljs-attr">"newPage"</span> : <span class="hljs-string">"false"</span>, <span class="hljs-attr">"robot"</span>: <span class="hljs-string">"true"</span>, <span class="hljs-attr">"anonymous"</span>: <span class="hljs-string">"false"</span>, <span class="hljs-attr">"namespace"</span>:<span class="hljs-string">"wikipedia"</span>, <span class="hljs-attr">"continent"</span>:<span class="hljs-string">"Asia"</span>, <span class="hljs-attr">"country"</span>:<span class="hljs-string">"Japan"</span>, <span class="hljs-attr">"region"</span>:<span class="hljs-string">"Kanto"</span>, <span class="hljs-attr">"city"</span>:<span class="hljs-string">"Tokyo"</span>, <span class="hljs-attr">"added"</span>: <span class="hljs-number">1</span>, <span class="hljs-attr">"deleted"</span>: <span class="hljs-number">10</span>, <span class="hljs-attr">"delta"</span>: <span class="hljs-number">-9</span>}
+</code></pre>
+<p><em>CSV</em></p>
+<pre><code class="hljs"><span class="hljs-number">2013</span><span class="hljs-number">-08</span><span class="hljs-number">-31</span><span class="hljs-string">T01:</span><span class="hljs-number">02</span>:<span class="hljs-number">33</span>Z,<span class="hljs-string">"Gypsy Danger"</span>,<span class="hljs-string">"en"</span>,<span class="hljs-string">"nuclear"</span>,<span class="hljs-string">"true"</span>,<span class="hljs-string">"true"</span>,<span class="hljs-string">"false"</span>,<span class="hljs-string">"false"</span>,<span class="hljs-string">"article"</span>,<span class="hljs-string">"North America"</span>,<span class="hljs-string">"United States"</span>,<span class="hljs-string">"Bay Area"</span>,<span class="hljs-string">"San Francisco"</span>,<span class="hljs-number">57</span>,<span class="hljs-number">200</span>,<span class="hljs-number">-143</span>
+<span class="hljs-number">2013</span><span class="hljs-number">-08</span><span class="hljs-number">-31</span><span class="hljs-string">T03:</span><span class="hljs-number">32</span>:<span class="hljs-number">45</span>Z,<span class="hljs-string">"Striker Eureka"</span>,<span class="hljs-string">"en"</span>,<span class="hljs-string">"speed"</span>,<span class="hljs-string">"false"</span>,<span class="hljs-string">"true"</span>,<span class="hljs-string">"true"</span>,<span class="hljs-string">"false"</span>,<span class="hljs-string">"wikipedia"</span>,<span class="hljs-string">"Australia"</span>,<span class="hljs-string">"Australia"</span>,<span class="hljs-string">"Cantebury"</span>,<span class="hljs-string">"Syndey"</span>,<span class="hljs-number">459</span>,<span class="hljs-number">129</span>,<span class="hljs-number">330</span>
+<span class="hljs-number">2013</span><span class="hljs-number">-08</span><span class="hljs-number">-31</span><span class="hljs-string">T07:</span><span class="hljs-number">11</span>:<span class="hljs-number">21</span>Z,<span class="hljs-string">"Cherno Alpha"</span>,<span class="hljs-string">"ru"</span>,<span class="hljs-string">"masterYi"</span>,<span class="hljs-string">"false"</span>,<span class="hljs-string">"true"</span>,<span class="hljs-string">"true"</span>,<span class="hljs-string">"false"</span>,<span class="hljs-string">"article"</span>,<span class="hljs-string">"Asia"</span>,<span class="hljs-string">"Russia"</span>,<span class="hljs-string">"Oblast"</span>,<span class="hljs-string">"Moscow"</span>,<span class="hljs-number">123</span>,<span class="hljs-number">12</span>,<span class="hljs-number">111</span>
+<span class="hljs-number">2013</span><span class="hljs-number">-08</span><span class="hljs-number">-31</span><span class="hljs-string">T11:</span><span class="hljs-number">58</span>:<span class="hljs-number">39</span>Z,<span class="hljs-string">"Crimson Typhoon"</span>,<span class="hljs-string">"zh"</span>,<span class="hljs-string">"triplets"</span>,<span class="hljs-string">"true"</span>,<span class="hljs-string">"false"</span>,<span class="hljs-string">"true"</span>,<span class="hljs-string">"false"</span>,<span class="hljs-string">"wikipedia"</span>,<span class="hljs-string">"Asia"</span>,<span class="hljs-string">"China"</span>,<span class="hljs-string">"Shanxi"</span>,<span class="hljs-string">"Taiyuan"</span>,<span class="hljs-number">905</span>,<span class="hljs-number">5</span>,<span class="hljs-number">900</span>
+<span class="hljs-number">2013</span><span class="hljs-number">-08</span><span class="hljs-number">-31</span><span class="hljs-string">T12:</span><span class="hljs-number">41</span>:<span class="hljs-number">27</span>Z,<span class="hljs-string">"Coyote Tango"</span>,<span class="hljs-string">"ja"</span>,<span class="hljs-string">"cancer"</span>,<span class="hljs-string">"true"</span>,<span class="hljs-string">"false"</span>,<span class="hljs-string">"true"</span>,<span class="hljs-string">"false"</span>,<span class="hljs-string">"wikipedia"</span>,<span class="hljs-string">"Asia"</span>,<span class="hljs-string">"Japan"</span>,<span class="hljs-string">"Kanto"</span>,<span class="hljs-string">"Tokyo"</span>,<span class="hljs-number">1</span>,<span class="hljs-number">10</span>,<span class="hljs-number">-9</span>
+</code></pre>
+<p><em>TSV (Delimited)</em></p>
+<pre><code class="hljs"><span class="hljs-number">2013</span><span class="hljs-number">-08</span><span class="hljs-number">-31</span><span class="hljs-string">T01:</span><span class="hljs-number">02</span>:<span class="hljs-number">33</span>Z  <span class="hljs-string">"Gypsy Danger"</span>  <span class="hljs-string">"en"</span>  <span class="hljs-string">"nuclear"</span> <span class="hljs-string">"true"</span>  <span class="hljs-string">"true"</span>  <span class="hljs-string">"false"</span> <span class="hljs-string">"false"</span> <span class="hljs-string">"article"</span> <span class="hljs-string">"North America"</span> <span class="hljs-string">"United States"</span> <span class="hljs-string">"Bay Area"</span>  <span class="hljs-string">"San Francisco"</span> <span class="hljs-number">57</span>  <span class="hljs-number">200</span> <span class="hljs-number">-143</span>
+<span class="hljs-number">2013</span><span class="hljs-number">-08</span><span class="hljs-number">-31</span><span class="hljs-string">T03:</span><span class="hljs-number">32</span>:<span class="hljs-number">45</span>Z  <span class="hljs-string">"Striker Eureka"</span>  <span class="hljs-string">"en"</span>  <span class="hljs-string">"speed"</span> <span class="hljs-string">"false"</span> <span class="hljs-string">"true"</span>  <span class="hljs-string">"true"</span>  <span class="hljs-string">"false"</span> <span class="hljs-string">"wikipedia"</span> <span class="hljs-string">"Australia"</span> <span class="hljs-string">"Australia"</span> <span class="hljs-string">"Cantebury"</span> <span class="hljs-string">"Syndey"</span>  <span class="hljs-number">459</span> <span class="hljs-number">129</span> <span class="hljs-number">330</span>
+<span class="hljs-number">2013</span><span class="hljs-number">-08</span><span class="hljs-number">-31</span><span class="hljs-string">T07:</span><span class="hljs-number">11</span>:<span class="hljs-number">21</span>Z  <span class="hljs-string">"Cherno Alpha"</span>  <span class="hljs-string">"ru"</span>  <span class="hljs-string">"masterYi"</span>  <span class="hljs-string">"false"</span> <span class="hljs-string">"true"</span>  <span class="hljs-string">"true"</span>  <span class="hljs-string">"false"</span> <span class="hljs-string">"article"</span> <span class="hljs-string">"Asia"</span>  <span class="hljs-string">"Russia"</span>  <span class="hljs-string">"Oblast"</span>  <span class="hljs-string">"Moscow"</span>  <span class="hljs-number">123</span> <span class="hljs-number">12</span>  <span class="hljs-number">111</span>
+<span class="hljs-number">2013</span><span class="hljs-number">-08</span><span class="hljs-number">-31</span><span class="hljs-string">T11:</span><span class="hljs-number">58</span>:<span class="hljs-number">39</span>Z  <span class="hljs-string">"Crimson Typhoon"</span> <span class="hljs-string">"zh"</span>  <span class="hljs-string">"triplets"</span>  <span class="hljs-string">"true"</span>  <span class="hljs-string">"false"</span> <span class="hljs-string">"true"</span>  <span class="hljs-string">"false"</span> <span class="hljs-string">"wikipedia"</span> <span class="hljs-string">"Asia"</span>  <span class="hljs-string">"China"</span> <span class="hljs-string">"Shanxi"</span>  <span class="hljs-string">"Taiyuan"</span> <span class="hljs-number">905</span> <span class="hljs-number">5</span> <span class="hljs-number">900</span>
+<span class="hljs-number">2013</span><span class="hljs-number">-08</span><span class="hljs-number">-31</span><span class="hljs-string">T12:</span><span class="hljs-number">41</span>:<span class="hljs-number">27</span>Z  <span class="hljs-string">"Coyote Tango"</span>  <span class="hljs-string">"ja"</span>  <span class="hljs-string">"cancer"</span>  <span class="hljs-string">"true"</span>  <span class="hljs-string">"false"</span> <span class="hljs-string">"true"</span>  <span class="hljs-string">"false"</span> <span class="hljs-string">"wikipedia"</span> <span class="hljs-string">"Asia"</span>  <span class="hljs-string">"Japan"</span> <span class="hljs-string">"Kanto"</span> <span class="hljs-string">"Tokyo"</span> <span class="hljs-number">1</span> <span class="hljs-number">10</span>  <span class="hljs-number">-9</span>
+</code></pre>
+<p>Note that the CSV and TSV data do not contain column heads. This becomes important when you specify the data for ingesting.</p>
+<p>Besides text formats, Druid also supports binary formats such as <a href="#orc">Orc</a> and <a href="#parquet">Parquet</a> formats.</p>
+<h2><a class="anchor" aria-hidden="true" id="custom-formats"></a><a href="#custom-formats" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Custom Formats</h2>
+<p>Druid supports custom data formats and can use the <code>Regex</code> parser or the <code>JavaScript</code> parsers to parse these formats. Please note that using any of these parsers for
+parsing data will not be as efficient as writing a native Java parser or using an external stream processor. We welcome contributions of new Parsers.</p>
+<h2><a class="anchor" aria-hidden="true" id="input-format"></a><a href="#input-format" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Input Format</h2>
+<blockquote>
+<p>The Input Format is a new way to specify the data format of your input data which was introduced in 0.17.0.
+Unfortunately, the Input Format doesn't support all data formats or ingestion methods supported by Druid yet.
+Especially if you want to use the Hadoop ingestion, you still need to use the <a href="#parser">Parser</a>.
+If your data is formatted in some format not listed in this section, please consider using the Parser instead.</p>
+</blockquote>
+<p>All forms of Druid ingestion require some form of schema object. The format of the data to be ingested is specified using the <code>inputFormat</code> entry in your <a href="/docs/0.20.0/ingestion/index.html#ioconfig"><code>ioConfig</code></a>.</p>
+<h3><a class="anchor" aria-hidden="true" id="json"></a><a href="#json" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>JSON</h3>
+<p>The <code>inputFormat</code> to load data of JSON format. An example is:</p>
+<pre><code class="hljs css language-json">"ioConfig": {
+  "inputFormat": {
+    "type": "json"
+  },
+  ...
+}
+</code></pre>
+<p>The JSON <code>inputFormat</code> has the following components:</p>
+<table>
+<thead>
+<tr><th>Field</th><th>Type</th><th>Description</th><th>Required</th></tr>
+</thead>
+<tbody>
+<tr><td>type</td><td>String</td><td>This should say <code>json</code>.</td><td>yes</td></tr>
+<tr><td>flattenSpec</td><td>JSON Object</td><td>Specifies flattening configuration for nested JSON data. See <a href="#flattenspec"><code>flattenSpec</code></a> for more info.</td><td>no</td></tr>
+<tr><td>featureSpec</td><td>JSON Object</td><td><a href="https://github.com/FasterXML/jackson-core/wiki/JsonParser-Features">JSON parser features</a> supported by Jackson library. Those features will be applied when parsing the input JSON data.</td><td>no</td></tr>
+</tbody>
+</table>
+<h3><a class="anchor" aria-hidden="true" id="csv"></a><a href="#csv" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>CSV</h3>
+<p>The <code>inputFormat</code> to load data of the CSV format. An example is:</p>
+<pre><code class="hljs css language-json">"ioConfig": {
+  "inputFormat": {
+    "type": "csv",
+    "columns" : ["timestamp","page","language","user","unpatrolled","newPage","robot","anonymous","namespace","continent","country","region","city","added","deleted","delta"]
+  },
+  ...
+}
+</code></pre>
+<p>The CSV <code>inputFormat</code> has the following components:</p>
+<table>
+<thead>
+<tr><th>Field</th><th>Type</th><th>Description</th><th>Required</th></tr>
+</thead>
+<tbody>
+<tr><td>type</td><td>String</td><td>This should say <code>csv</code>.</td><td>yes</td></tr>
+<tr><td>listDelimiter</td><td>String</td><td>A custom delimiter for multi-value dimensions.</td><td>no (default = ctrl+A)</td></tr>
+<tr><td>columns</td><td>JSON array</td><td>Specifies the columns of the data. The columns should be in the same order with the columns of your data.</td><td>yes if <code>findColumnsFromHeader</code> is false or missing</td></tr>
+<tr><td>findColumnsFromHeader</td><td>Boolean</td><td>If this is set, the task will find the column names from the header row. Note that <code>skipHeaderRows</code> will be applied before finding column names from the header. For example, if you set <code>skipHeaderRows</code> to 2 and <code>findColumnsFromHeader</code> to true, the task will skip the first two lines and then extract column information from the third line. <code>columns</code> will be ignored if this is set to true.</td><td>no (default = false if <code>columns</code> is set; otherwise null)</td></tr>
+<tr><td>skipHeaderRows</td><td>Integer</td><td>If this is set, the task will skip the first <code>skipHeaderRows</code> rows.</td><td>no (default = 0)</td></tr>
+</tbody>
+</table>
+<h3><a class="anchor" aria-hidden="true" id="tsv-delimited"></a><a href="#tsv-delimited" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>TSV (Delimited)</h3>
+<pre><code class="hljs css language-json">"ioConfig": {
+  "inputFormat": {
+    "type": "tsv",
+    "columns" : ["timestamp","page","language","user","unpatrolled","newPage","robot","anonymous","namespace","continent","country","region","city","added","deleted","delta"],
+    "delimiter":"|"
+  },
+  ...
+}
+</code></pre>
+<p>The <code>inputFormat</code> to load data of a delimited format. An example is:</p>
+<table>
+<thead>
+<tr><th>Field</th><th>Type</th><th>Description</th><th>Required</th></tr>
+</thead>
+<tbody>
+<tr><td>type</td><td>String</td><td>This should say <code>tsv</code>.</td><td>yes</td></tr>
+<tr><td>delimiter</td><td>String</td><td>A custom delimiter for data values.</td><td>no (default = <code>\t</code>)</td></tr>
+<tr><td>listDelimiter</td><td>String</td><td>A custom delimiter for multi-value dimensions.</td><td>no (default = ctrl+A)</td></tr>
+<tr><td>columns</td><td>JSON array</td><td>Specifies the columns of the data. The columns should be in the same order with the columns of your data.</td><td>yes if <code>findColumnsFromHeader</code> is false or missing</td></tr>
+<tr><td>findColumnsFromHeader</td><td>Boolean</td><td>If this is set, the task will find the column names from the header row. Note that <code>skipHeaderRows</code> will be applied before finding column names from the header. For example, if you set <code>skipHeaderRows</code> to 2 and <code>findColumnsFromHeader</code> to true, the task will skip the first two lines and then extract column information from the third line. <code>columns</code> will be ignored if this is set to true.</td><td>no (default = false if <code>columns</code> is set; otherwise null)</td></tr>
+<tr><td>skipHeaderRows</td><td>Integer</td><td>If this is set, the task will skip the first <code>skipHeaderRows</code> rows.</td><td>no (default = 0)</td></tr>
+</tbody>
+</table>
+<p>Be sure to change the <code>delimiter</code> to the appropriate delimiter for your data. Like CSV, you must specify the columns and which subset of the columns you want indexed.</p>
+<h3><a class="anchor" aria-hidden="true" id="orc"></a><a href="#orc" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>ORC</h3>
+<blockquote>
+<p>You need to include the <a href="/docs/0.20.0/development/extensions-core/orc.html"><code>druid-orc-extensions</code></a> as an extension to use the ORC input format.</p>
+</blockquote>
+<blockquote>
+<p>If you are considering upgrading from earlier than 0.15.0 to 0.15.0 or a higher version,
+please read <a href="/docs/0.20.0/development/extensions-core/orc.html#migration-from-contrib-extension">Migration from 'contrib' extension</a> carefully.</p>
+</blockquote>
+<p>The <code>inputFormat</code> to load data of ORC format. An example is:</p>
+<pre><code class="hljs css language-json">"ioConfig": {
+  "inputFormat": {
+    "type": "orc",
+    "flattenSpec": {
+      "useFieldDiscovery": true,
+      "fields": [
+        {
+          "type": "path",
+          "name": "nested",
+          "expr": "$.path.to.nested"
+        }
+      ]
+    },
+    "binaryAsString": false
+  },
+  ...
+}
+</code></pre>
+<p>The ORC <code>inputFormat</code> has the following components:</p>
+<table>
+<thead>
+<tr><th>Field</th><th>Type</th><th>Description</th><th>Required</th></tr>
+</thead>
+<tbody>
+<tr><td>type</td><td>String</td><td>This should say <code>orc</code>.</td><td>yes</td></tr>
+<tr><td>flattenSpec</td><td>JSON Object</td><td>Specifies flattening configuration for nested ORC data. See <a href="#flattenspec"><code>flattenSpec</code></a> for more info.</td><td>no</td></tr>
+<tr><td>binaryAsString</td><td>Boolean</td><td>Specifies if the binary orc column which is not logically marked as a string should be treated as a UTF-8 encoded string.</td><td>no (default = false)</td></tr>
+</tbody>
+</table>
+<h3><a class="anchor" aria-hidden="true" id="parquet"></a><a href="#parquet" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Parquet</h3>
+<blockquote>
+<p>You need to include the <a href="/docs/0.20.0/development/extensions-core/parquet.html"><code>druid-parquet-extensions</code></a> as an extension to use the Parquet input format.</p>
+</blockquote>
+<p>The <code>inputFormat</code> to load data of Parquet format. An example is:</p>
+<pre><code class="hljs css language-json">"ioConfig": {
+  "inputFormat": {
+    "type": "parquet",
+    "flattenSpec": {
+      "useFieldDiscovery": true,
+      "fields": [
+        {
+          "type": "path",
+          "name": "nested",
+          "expr": "$.path.to.nested"
+        }
+      ]
+    },
+    "binaryAsString": false
+  },
+  ...
+}
+</code></pre>
+<p>The Parquet <code>inputFormat</code> has the following components:</p>
+<table>
+<thead>
+<tr><th>Field</th><th>Type</th><th>Description</th><th>Required</th></tr>
+</thead>
+<tbody>
+<tr><td>type</td><td>String</td><td>This should be set to <code>parquet</code> to read Parquet file</td><td>yes</td></tr>
+<tr><td>flattenSpec</td><td>JSON Object</td><td>Define a <a href="#flattenspec"><code>flattenSpec</code></a> to extract nested values from a Parquet file. Note that only 'path' expression are supported ('jq' is unavailable).</td><td>no (default will auto-discover 'root' level properties)</td></tr>
+<tr><td>binaryAsString</td><td>Boolean</td><td>Specifies if the bytes parquet column which is not logically marked as a string or enum type should be treated as a UTF-8 encoded string.</td><td>no (default = false)</td></tr>
+</tbody>
+</table>
+<h3><a class="anchor" aria-hidden="true" id="avro-ocf"></a><a href="#avro-ocf" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Avro OCF</h3>
+<blockquote>
+<p>You need to include the <a href="/docs/0.20.0/development/extensions-core/avro.html"><code>druid-avro-extensions</code></a> as an extension to use the Avro OCF input format.</p>
+</blockquote>
+<p>The <code>inputFormat</code> to load data of Avro OCF format. An example is:</p>
+<pre><code class="hljs css language-json">"ioConfig": {
+  "inputFormat": {
+    "type": "avro_ocf",
+    "flattenSpec": {
+      "useFieldDiscovery": true,
+      "fields": [
+        {
+          "type": "path",
+          "name": "someRecord_subInt",
+          "expr": "$.someRecord.subInt"
+        }
+      ]
+    },
+    "schema": {
+      "namespace": "org.apache.druid.data.input",
+      "name": "SomeDatum",
+      "type": "record",
+      "fields" : [
+        { "name": "timestamp", "type": "long" },
+        { "name": "eventType", "type": "string" },
+        { "name": "id", "type": "long" },
+        { "name": "someRecord", "type": {
+          "type": "record", "name": "MySubRecord", "fields": [
+            { "name": "subInt", "type": "int"},
+            { "name": "subLong", "type": "long"}
+          ]
+        }}]
+    },
+    "binaryAsString": false
+  },
+  ...
+}
+</code></pre>
+<table>
+<thead>
+<tr><th>Field</th><th>Type</th><th>Description</th><th>Required</th></tr>
+</thead>
+<tbody>
+<tr><td>type</td><td>String</td><td>This should be set to <code>avro_ocf</code> to read Avro OCF file</td><td>yes</td></tr>
+<tr><td>flattenSpec</td><td>JSON Object</td><td>Define a <a href="#flattenspec"><code>flattenSpec</code></a> to extract nested values from a Avro records. Note that only 'path' expression are supported ('jq' is unavailable).</td><td>no (default will auto-discover 'root' level properties)</td></tr>
+<tr><td>schema</td><td>JSON Object</td><td>Define a reader schema to be used when parsing Avro records, this is useful when parsing multiple versions of Avro OCF file data</td><td>no (default will decode using the writer schema contained in the OCF file)</td></tr>
+<tr><td>binaryAsString</td><td>Boolean</td><td>Specifies if the bytes parquet column which is not logically marked as a string or enum type should be treated as a UTF-8 encoded string.</td><td>no (default = false)</td></tr>
+</tbody>
+</table>
+<h3><a class="anchor" aria-hidden="true" id="flattenspec"></a><a href="#flattenspec" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>FlattenSpec</h3>
+<p>The <code>flattenSpec</code> is located in <code>inputFormat</code> → <code>flattenSpec</code> and is responsible for
+bridging the gap between potentially nested input data (such as JSON, Avro, etc) and Druid's flat data model.
+An example <code>flattenSpec</code> is:</p>
+<pre><code class="hljs css language-json">"flattenSpec": {
+  "useFieldDiscovery": true,
+  "fields": [
+    { "name": "baz", "type": "root" },
+    { "name": "foo_bar", "type": "path", "expr": "$.foo.bar" },
+    { "name": "first_food", "type": "jq", "expr": ".thing.food[1]" }
+  ]
+}
+</code></pre>
+<blockquote>
+<p>Conceptually, after input data records are read, the <code>flattenSpec</code> is applied first before
+any other specs such as <a href="/docs/0.20.0/ingestion/index.html#timestampspec"><code>timestampSpec</code></a>, <a href="/docs/0.20.0/ingestion/index.html#transformspec"><code>transformSpec</code></a>,
+<a href="/docs/0.20.0/ingestion/index.html#dimensionsspec"><code>dimensionsSpec</code></a>, or <a href="/docs/0.20.0/ingestion/index.html#metricsspec"><code>metricsSpec</code></a>. Keep this in mind when writing
+your ingestion spec.</p>
+</blockquote>
+<p>Flattening is only supported for <a href="/docs/0.20.0/ingestion/data-formats.html">data formats</a> that support nesting, including <code>avro</code>, <code>json</code>, <code>orc</code>,
+and <code>parquet</code>.</p>
+<p>A <code>flattenSpec</code> can have the following components:</p>
+<table>
+<thead>
+<tr><th>Field</th><th>Description</th><th>Default</th></tr>
+</thead>
+<tbody>
+<tr><td>useFieldDiscovery</td><td>If true, interpret all root-level fields as available fields for usage by <a href="/docs/0.20.0/ingestion/index.html#timestampspec"><code>timestampSpec</code></a>, <a href="/docs/0.20.0/ingestion/index.html#transformspec"><code>transformSpec</code></a>, <a href="/docs/0.20.0/ingestion/index.html#dimensionsspec"><code>dimensionsSpec</code></a>, and <a href="/docs/0.20.0/ingestion/index.html#metricsspec"><code>metricsSpec</code></a>.<br><br>If false, only explicitly specified fields (see <code>fields</code>) will be available for use.</td><td><code>true</code></td></tr>
+<tr><td>fields</td><td>Specifies the fields of interest and how they are accessed. <a href="#field-flattening-specifications">See below for details.</a></td><td><code>[]</code></td></tr>
+</tbody>
+</table>
+<h4><a class="anchor" aria-hidden="true" id="field-flattening-specifications"></a><a href="#field-flattening-specifications" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Field flattening specifications</h4>
+<p>Each entry in the <code>fields</code> list can have the following components:</p>
+<table>
+<thead>
+<tr><th>Field</th><th>Description</th><th>Default</th></tr>
+</thead>
+<tbody>
+<tr><td>type</td><td>Options are as follows:<br><br><ul><li><code>root</code>, referring to a field at the root level of the record. Only really useful if <code>useFieldDiscovery</code> is false.</li><li><code>path</code>, referring to a field using <a href="https://github.com/jayway/JsonPath">JsonPath</a> notation. Supported by most data formats that offer nesting, including <code>avro</code>, <code>json</code>, <code>orc</code>, and <code>parquet</code>.</li><li><code>jq</code>, referring to a field using <a href="https://github.com/eiiches/jackson-jq">jackson-jq</a> notation. Only supported for the <code>json</code> format.</li></ul></td><td>none (required)</td></tr>
+<tr><td>name</td><td>Name of the field after flattening. This name can be referred to by the <a href="/docs/0.20.0/ingestion/index.html#timestampspec"><code>timestampSpec</code></a>, <a href="/docs/0.20.0/ingestion/index.html#transformspec"><code>transformSpec</code></a>, <a href="/docs/0.20.0/ingestion/index.html#dimensionsspec"><code>dimensionsSpec</code></a>, and <a href="/docs/0.20.0/ingestion/index.html#metricsspec"><code>metricsSpec</code></a>.</td><td>none (required)</td></tr>
+<tr><td>expr</td><td>Expression for accessing the field while flattening. For type <code>path</code>, this should be <a href="https://github.com/jayway/JsonPath">JsonPath</a>. For type <code>jq</code>, this should be <a href="https://github.com/eiiches/jackson-jq">jackson-jq</a> notation. For other types, this parameter is ignored.</td><td>none (required for types <code>path</code> and <code>jq</code>)</td></tr>
+</tbody>
+</table>
+<h4><a class="anchor" aria-hidden="true" id="notes-on-flattening"></a><a href="#notes-on-flattening" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Notes on flattening</h4>
+<ul>
+<li>For convenience, when defining a root-level field, it is possible to define only the field name, as a string, instead of a JSON object. For example, <code>{&quot;name&quot;: &quot;baz&quot;, &quot;type&quot;: &quot;root&quot;}</code> is equivalent to <code>&quot;baz&quot;</code>.</li>
+<li>Enabling <code>useFieldDiscovery</code> will only automatically detect &quot;simple&quot; fields at the root level that correspond to data types that Druid supports. This includes strings, numbers, and lists of strings or numbers. Other types will not be automatically detected, and must be specified explicitly in the <code>fields</code> list.</li>
+<li>Duplicate field <code>name</code>s are not allowed. An exception will be thrown.</li>
+<li>If <code>useFieldDiscovery</code> is enabled, any discovered field with the same name as one already defined in the <code>fields</code> list will be skipped, rather than added twice.</li>
+<li><a href="http://jsonpath.herokuapp.com/">http://jsonpath.herokuapp.com/</a> is useful for testing <code>path</code>-type expressions.</li>
+<li>jackson-jq supports a subset of the full <a href="https://stedolan.github.io/jq/">jq</a> syntax.  Please refer to the <a href="https://github.com/eiiches/jackson-jq">jackson-jq documentation</a> for details.</li>
+</ul>
+<h2><a class="anchor" aria-hidden="true" id="parser"></a><a href="#parser" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Parser</h2>
+<blockquote>
+<p>The Parser is deprecated for <a href="/docs/0.20.0/ingestion/native-batch.html">native batch tasks</a>, <a href="/docs/0.20.0/development/extensions-core/kafka-ingestion.html">Kafka indexing service</a>,
+and <a href="/docs/0.20.0/development/extensions-core/kinesis-ingestion.html">Kinesis indexing service</a>.
+Consider using the <a href="#input-format">input format</a> instead for these types of ingestion.</p>
+</blockquote>
+<p>This section lists all default and core extension parsers.
+For community extension parsers, please see our <a href="../development/extensions.html#community-extensions">community extensions list</a>.</p>
+<h3><a class="anchor" aria-hidden="true" id="string-parser"></a><a href="#string-parser" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>String Parser</h3>
+<p><code>string</code> typed parsers operate on text based inputs that can be split into individual records by newlines.
+Each line can be further parsed using <a href="#parsespec"><code>parseSpec</code></a>.</p>
+<table>
+<thead>
+<tr><th>Field</th><th>Type</th><th>Description</th><th>Required</th></tr>
+</thead>
+<tbody>
+<tr><td>type</td><td>String</td><td>This should say <code>string</code> in general, or <code>hadoopyString</code> when used in a Hadoop indexing job.</td><td>yes</td></tr>
+<tr><td>parseSpec</td><td>JSON Object</td><td>Specifies the format, timestamp, and dimensions of the data.</td><td>yes</td></tr>
+</tbody>
+</table>
+<h3><a class="anchor" aria-hidden="true" id="avro-hadoop-parser"></a><a href="#avro-hadoop-parser" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Avro Hadoop Parser</h3>
+<blockquote>
+<p>You need to include the <a href="/docs/0.20.0/development/extensions-core/avro.html"><code>druid-avro-extensions</code></a> as an extension to use the Avro Hadoop Parser.</p>
+</blockquote>
+<p>This parser is for <a href="/docs/0.20.0/ingestion/hadoop.html">Hadoop batch ingestion</a>.
+The <code>inputFormat</code> of <code>inputSpec</code> in <code>ioConfig</code> must be set to <code>&quot;org.apache.druid.data.input.avro.AvroValueInputFormat&quot;</code>.
+You may want to set Avro reader's schema in <code>jobProperties</code> in <code>tuningConfig</code>,
+e.g.: <code>&quot;avro.schema.input.value.path&quot;: &quot;/path/to/your/schema.avsc&quot;</code> or
+<code>&quot;avro.schema.input.value&quot;: &quot;your_schema_JSON_object&quot;</code>.
+If the Avro reader's schema is not set, the schema in Avro object container file will be used.
+See <a href="http://avro.apache.org/docs/1.7.7/spec.html#Schema+Resolution">Avro specification</a> for more information.</p>
+<table>
+<thead>
+<tr><th>Field</th><th>Type</th><th>Description</th><th>Required</th></tr>
+</thead>
+<tbody>
+<tr><td>type</td><td>String</td><td>This should say <code>avro_hadoop</code>.</td><td>yes</td></tr>
+<tr><td>parseSpec</td><td>JSON Object</td><td>Specifies the timestamp and dimensions of the data. Should be an &quot;avro&quot; parseSpec.</td><td>yes</td></tr>
+<tr><td>fromPigAvroStorage</td><td>Boolean</td><td>Specifies whether the data file is stored using AvroStorage.</td><td>no(default == false)</td></tr>
+</tbody>
+</table>
+<p>An Avro parseSpec can contain a <a href="#flattenspec"><code>flattenSpec</code></a> using either the &quot;root&quot; or &quot;path&quot;
+field types, which can be used to read nested Avro records. The &quot;jq&quot; field type is not currently supported for Avro.</p>
+<p>For example, using Avro Hadoop parser with custom reader's schema file:</p>
+<pre><code class="hljs css language-json">{
+  <span class="hljs-attr">"type"</span> : <span class="hljs-string">"index_hadoop"</span>,
+  <span class="hljs-attr">"spec"</span> : {
+    <span class="hljs-attr">"dataSchema"</span> : {
+      <span class="hljs-attr">"dataSource"</span> : <span class="hljs-string">""</span>,
+      <span class="hljs-attr">"parser"</span> : {
+        <span class="hljs-attr">"type"</span> : <span class="hljs-string">"avro_hadoop"</span>,
+        <span class="hljs-attr">"parseSpec"</span> : {
+          <span class="hljs-attr">"format"</span>: <span class="hljs-string">"avro"</span>,
+          <span class="hljs-attr">"timestampSpec"</span>: &lt;standard timestampSpec&gt;,
+          <span class="hljs-attr">"dimensionsSpec"</span>: &lt;standard dimensionsSpec&gt;,
+          <span class="hljs-attr">"flattenSpec"</span>: &lt;optional&gt;
+        }
+      }
+    },
+    <span class="hljs-attr">"ioConfig"</span> : {
+      <span class="hljs-attr">"type"</span> : <span class="hljs-string">"hadoop"</span>,
+      <span class="hljs-attr">"inputSpec"</span> : {
+        <span class="hljs-attr">"type"</span> : <span class="hljs-string">"static"</span>,
+        <span class="hljs-attr">"inputFormat"</span>: <span class="hljs-string">"org.apache.druid.data.input.avro.AvroValueInputFormat"</span>,
+        <span class="hljs-attr">"paths"</span> : <span class="hljs-string">""</span>
+      }
+    },
+    <span class="hljs-attr">"tuningConfig"</span> : {
+       <span class="hljs-attr">"jobProperties"</span> : {
+          <span class="hljs-attr">"avro.schema.input.value.path"</span> : <span class="hljs-string">"/path/to/my/schema.avsc"</span>
+      }
+    }
+  }
+}
+</code></pre>
+<h3><a class="anchor" aria-hidden="true" id="orc-hadoop-parser"></a><a href="#orc-hadoop-parser" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>ORC Hadoop Parser</h3>
+<blockquote>
+<p>You need to include the <a href="/docs/0.20.0/development/extensions-core/orc.html"><code>druid-orc-extensions</code></a> as an extension to use the ORC Hadoop Parser.</p>
+</blockquote>
+<blockquote>
+<p>If you are considering upgrading from earlier than 0.15.0 to 0.15.0 or a higher version,
+please read <a href="/docs/0.20.0/development/extensions-core/orc.html#migration-from-contrib-extension">Migration from 'contrib' extension</a> carefully.</p>
+</blockquote>
+<p>This parser is for <a href="/docs/0.20.0/ingestion/hadoop.html">Hadoop batch ingestion</a>.
+The <code>inputFormat</code> of <code>inputSpec</code> in <code>ioConfig</code> must be set to <code>&quot;org.apache.orc.mapreduce.OrcInputFormat&quot;</code>.</p>
+<table>
+<thead>
+<tr><th>Field</th><th>Type</th><th>Description</th><th>Required</th></tr>
+</thead>
+<tbody>
+<tr><td>type</td><td>String</td><td>This should say <code>orc</code></td><td>yes</td></tr>
+<tr><td>parseSpec</td><td>JSON Object</td><td>Specifies the timestamp and dimensions of the data (<code>timeAndDims</code> and <code>orc</code> format) and a <code>flattenSpec</code> (<code>orc</code> format)</td><td>yes</td></tr>
+</tbody>
+</table>
+<p>The parser supports two <code>parseSpec</code> formats: <code>orc</code> and <code>timeAndDims</code>.</p>
+<p><code>orc</code> supports auto field discovery and flattening, if specified with a <a href="#flattenspec"><code>flattenSpec</code></a>.
+If no <code>flattenSpec</code> is specified, <code>useFieldDiscovery</code> will be enabled by default. Specifying a <code>dimensionSpec</code> is
+optional if <code>useFieldDiscovery</code> is enabled: if a <code>dimensionSpec</code> is supplied, the list of <code>dimensions</code> it defines will be
+the set of ingested dimensions, if missing the discovered fields will make up the list.</p>
+<p><code>timeAndDims</code> parse spec must specify which fields will be extracted as dimensions through the <code>dimensionSpec</code>.</p>
+<p><a href="https://orc.apache.org/docs/types.html">All column types</a> are supported, with the exception of <code>union</code> types. Columns of
+<code>list</code> type, if filled with primitives, may be used as a multi-value dimension, or specific elements can be extracted with
+<code>flattenSpec</code> expressions. Likewise, primitive fields may be extracted from <code>map</code> and <code>struct</code> types in the same manner.
+Auto field discovery will automatically create a string dimension for every (non-timestamp) primitive or <code>list</code> of
+primitives, as well as any flatten expressions defined in the <code>flattenSpec</code>.</p>
+<h4><a class="anchor" aria-hidden="true" id="hadoop-job-properties"></a><a href="#hadoop-job-properties" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Hadoop job properties</h4>
+<p>Like most Hadoop jobs, the best outcomes will add <code>&quot;mapreduce.job.user.classpath.first&quot;: &quot;true&quot;</code> or
+<code>&quot;mapreduce.job.classloader&quot;: &quot;true&quot;</code> to the <code>jobProperties</code> section of <code>tuningConfig</code>. Note that it is likely if using
+<code>&quot;mapreduce.job.classloader&quot;: &quot;true&quot;</code> that you will need to set <code>mapreduce.job.classloader.system.classes</code> to include
+<code>-org.apache.hadoop.hive.</code> to instruct Hadoop to load <code>org.apache.hadoop.hive</code> classes from the application jars instead
+of system jars, e.g.</p>
+<pre><code class="hljs css language-json">...
+    "mapreduce.job.classloader": "true",
+    "mapreduce.job.classloader.system.classes" : "java., javax.accessibility., javax.activation., javax.activity., javax.annotation., javax.annotation.processing., javax.crypto., javax.imageio., javax.jws., javax.lang.model., -javax.management.j2ee., javax.management., javax.naming., javax.net., javax.print., javax.rmi., javax.script., -javax.security.auth.message., javax.security.auth., javax.security.cert., javax.security.sasl., javax.sound., javax.sql., javax.swing., javax.tools., javax.transaction., -javax.xml.registry., -javax.xml.rpc., javax.xml., org.w3c.dom., org.xml.sax., org.apache.commons.logging., org.apache.log4j., -org.apache.hadoop.hbase., -org.apache.hadoop.hive., org.apache.hadoop., core-default.xml, hdfs-default.xml, mapred-default.xml, yarn-default.xml",
+...
+</code></pre>
+<p>This is due to the <code>hive-storage-api</code> dependency of the
+<code>orc-mapreduce</code> library, which provides some classes under the <code>org.apache.hadoop.hive</code> package. If instead using the
+setting <code>&quot;mapreduce.job.user.classpath.first&quot;: &quot;true&quot;</code>, then this will not be an issue.</p>
+<h4><a class="anchor" aria-hidden="true" id="examples"></a><a href="#examples" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Examples</h4>
+<h5><a class="anchor" aria-hidden="true" id="orc-parser-orc-parsespec-auto-field-discovery-flatten-expressions"></a><a href="#orc-parser-orc-parsespec-auto-field-discovery-flatten-expressions" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a><code>orc</code> parser, <code>orc</code> parseSpec, auto field discovery, flatten expressions</h5>
+<pre><code class="hljs css language-json">{
+  "type": "index_hadoop",
+  "spec": {
+    "ioConfig": {
+      "type": "hadoop",
+      "inputSpec": {
+        "type": "static",
+        "inputFormat": "org.apache.orc.mapreduce.OrcInputFormat",
+        "paths": "path/to/file.orc"
+      },
+      ...
+    },
+    "dataSchema": {
+      "dataSource": "example",
+      "parser": {
+        "type": "orc",
+        "parseSpec": {
+          "format": "orc",
+          "flattenSpec": {
+            "useFieldDiscovery": true,
+            "fields": [
+              {
+                "type": "path",
+                "name": "nestedDim",
+                "expr": "$.nestedData.dim1"
+              },
+              {
+                "type": "path",
+                "name": "listDimFirstItem",
+                "expr": "$.listDim[1]"
+              }
+            ]
+          },
+          "timestampSpec": {
+            "column": "timestamp",
+            "format": "millis"
+          }
+        }
+      },
+      ...
+    },
+    "tuningConfig": &lt;hadoop-tuning-config&gt;
+    }
+  }
+}
+</code></pre>
+<h5><a class="anchor" aria-hidden="true" id="orc-parser-orc-parsespec-field-discovery-with-no-flattenspec-or-dimensionspec"></a><a href="#orc-parser-orc-parsespec-field-discovery-with-no-flattenspec-or-dimensionspec" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a><code>orc</code> parser, <code>orc</code> parseSpec, field discovery with no flattenSpec or dimensionSpec</h5>
+<pre><code class="hljs css language-json">{
+  "type": "index_hadoop",
+  "spec": {
+    "ioConfig": {
+      "type": "hadoop",
+      "inputSpec": {
+        "type": "static",
+        "inputFormat": "org.apache.orc.mapreduce.OrcInputFormat",
+        "paths": "path/to/file.orc"
+      },
+      ...
+    },
+    "dataSchema": {
+      "dataSource": "example",
+      "parser": {
+        "type": "orc",
+        "parseSpec": {
+          "format": "orc",
+          "timestampSpec": {
+            "column": "timestamp",
+            "format": "millis"
+          }
+        }
+      },
+      ...
+    },
+    "tuningConfig": &lt;hadoop-tuning-config&gt;
+    }
+  }
+}
+</code></pre>
+<h5><a class="anchor" aria-hidden="true" id="orc-parser-orc-parsespec-no-autodiscovery"></a><a href="#orc-parser-orc-parsespec-no-autodiscovery" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a><code>orc</code> parser, <code>orc</code> parseSpec, no autodiscovery</h5>
+<pre><code class="hljs css language-json">{
+  "type": "index_hadoop",
+  "spec": {
+    "ioConfig": {
+      "type": "hadoop",
+      "inputSpec": {
+        "type": "static",
+        "inputFormat": "org.apache.orc.mapreduce.OrcInputFormat",
+        "paths": "path/to/file.orc"
+      },
+      ...
+    },
+    "dataSchema": {
+      "dataSource": "example",
+      "parser": {
+        "type": "orc",
+        "parseSpec": {
+          "format": "orc",
+          "flattenSpec": {
+            "useFieldDiscovery": false,
+            "fields": [
+              {
+                "type": "path",
+                "name": "nestedDim",
+                "expr": "$.nestedData.dim1"
+              },
+              {
+                "type": "path",
+                "name": "listDimFirstItem",
+                "expr": "$.listDim[1]"
+              }
+            ]
+          },
+          "timestampSpec": {
+            "column": "timestamp",
+            "format": "millis"
+          },
+          "dimensionsSpec": {
+            "dimensions": [
+              "dim1",
+              "dim3",
+              "nestedDim",
+              "listDimFirstItem"
+            ],
+            "dimensionExclusions": [],
+            "spatialDimensions": []
+          }
+        }
+      },
+      ...
+    },
+    "tuningConfig": &lt;hadoop-tuning-config&gt;
+    }
+  }
+}
+</code></pre>
+<h5><a class="anchor" aria-hidden="true" id="orc-parser-timeanddims-parsespec"></a><a href="#orc-parser-timeanddims-parsespec" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a><code>orc</code> parser, <code>timeAndDims</code> parseSpec</h5>
+<pre><code class="hljs css language-json">{
+  "type": "index_hadoop",
+  "spec": {
+    "ioConfig": {
+      "type": "hadoop",
+      "inputSpec": {
+        "type": "static",
+        "inputFormat": "org.apache.orc.mapreduce.OrcInputFormat",
+        "paths": "path/to/file.orc"
+      },
+      ...
+    },
+    "dataSchema": {
+      "dataSource": "example",
+      "parser": {
+        "type": "orc",
+        "parseSpec": {
+          "format": "timeAndDims",
+          "timestampSpec": {
+            "column": "timestamp",
+            "format": "auto"
+          },
+          "dimensionsSpec": {
+            "dimensions": [
+              "dim1",
+              "dim2",
+              "dim3",
+              "listDim"
+            ],
+            "dimensionExclusions": [],
+            "spatialDimensions": []
+          }
+        }
+      },
+      ...
+    },
+    "tuningConfig": &lt;hadoop-tuning-config&gt;
+  }
+}
+
+</code></pre>
+<h3><a class="anchor" aria-hidden="true" id="parquet-hadoop-parser"></a><a href="#parquet-hadoop-parser" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Parquet Hadoop Parser</h3>
+<blockquote>
+<p>You need to include the <a href="/docs/0.20.0/development/extensions-core/parquet.html"><code>druid-parquet-extensions</code></a> as an extension to use the Parquet Hadoop Parser.</p>
+</blockquote>
+<p>The Parquet Hadoop parser is for <a href="/docs/0.20.0/ingestion/hadoop.html">Hadoop batch ingestion</a> and parses Parquet files directly.
+The <code>inputFormat</code> of <code>inputSpec</code> in <code>ioConfig</code> must be set to <code>org.apache.druid.data.input.parquet.DruidParquetInputFormat</code>.</p>
+<p>The Parquet Hadoop Parser supports auto field discovery and flattening if provided with a
+<a href="#flattenspec"><code>flattenSpec</code></a> with the <code>parquet</code> <code>parseSpec</code>. Parquet nested list and map
+<a href="https://github.com/apache/parquet-format/blob/master/LogicalTypes.md">logical types</a> <em>should</em> operate correctly with
+JSON path expressions for all supported types.</p>
+<table>
+<thead>
+<tr><th>Field</th><th>Type</th><th>Description</th><th>Required</th></tr>
+</thead>
+<tbody>
+<tr><td>type</td><td>String</td><td>This should say <code>parquet</code>.</td><td>yes</td></tr>
+<tr><td>parseSpec</td><td>JSON Object</td><td>Specifies the timestamp and dimensions of the data, and optionally, a flatten spec. Valid parseSpec formats are <code>timeAndDims</code> and <code>parquet</code></td><td>yes</td></tr>
+<tr><td>binaryAsString</td><td>Boolean</td><td>Specifies if the bytes parquet column which is not logically marked as a string or enum type should be treated as a UTF-8 encoded string.</td><td>no(default = false)</td></tr>
+</tbody>
+</table>
+<p>When the time dimension is a <a href="https://github.com/apache/parquet-format/blob/master/LogicalTypes.md">DateType column</a>,
+a format should not be supplied. When the format is UTF8 (String), either <code>auto</code> or a explicitly defined
+<a href="http://www.joda.org/joda-time/apidocs/org/joda/time/format/DateTimeFormat.html">format</a> is required.</p>
+<h4><a class="anchor" aria-hidden="true" id="parquet-hadoop-parser-vs-parquet-avro-hadoop-parser"></a><a href="#parquet-hadoop-parser-vs-parquet-avro-hadoop-parser" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Parquet Hadoop Parser vs Parquet Avro Hadoop Parser</h4>
+<p>Both parsers read from Parquet files, but slightly differently. The main
+differences are:</p>
+<ul>
+<li>The Parquet Hadoop Parser uses a simple conversion while the Parquet Avro Hadoop Parser
+converts Parquet data into avro records first with the <code>parquet-avro</code> library and then
+parses avro data using the <code>druid-avro-extensions</code> module to ingest into Druid.</li>
+<li>The Parquet Hadoop Parser sets a hadoop job property
+<code>parquet.avro.add-list-element-records</code> to <code>false</code> (which normally defaults to <code>true</code>), in order to 'unwrap' primitive
+list elements into multi-value dimensions.</li>
+<li>The Parquet Hadoop Parser supports <code>int96</code> Parquet values, while the Parquet Avro Hadoop Parser does not.
+There may also be some subtle differences in the behavior of JSON path expression evaluation of <code>flattenSpec</code>.</li>
+</ul>
+<p>Based on those differences, we suggest using the Parquet Hadoop Parser over the Parquet Avro Hadoop Parser
+to allow ingesting data beyond the schema constraints of Avro conversion.
+However, the Parquet Avro Hadoop Parser was the original basis for supporting the Parquet format, and as such it is a bit more mature.</p>
+<h4><a class="anchor" aria-hidden="true" id="examples-1"></a><a href="#examples-1" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Examples</h4>
+<h5><a class="anchor" aria-hidden="true" id="parquet-parser-parquet-parsespec"></a><a href="#parquet-parser-parquet-parsespec" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a><code>parquet</code> parser, <code>parquet</code> parseSpec</h5>
+<pre><code class="hljs css language-json">{
+  "type": "index_hadoop",
+  "spec": {
+    "ioConfig": {
+      "type": "hadoop",
+      "inputSpec": {
+        "type": "static",
+        "inputFormat": "org.apache.druid.data.input.parquet.DruidParquetInputFormat",
+        "paths": "path/to/file.parquet"
+      },
+      ...
+    },
+    "dataSchema": {
+      "dataSource": "example",
+      "parser": {
+        "type": "parquet",
+        "parseSpec": {
+          "format": "parquet",
+          "flattenSpec": {
+            "useFieldDiscovery": true,
+            "fields": [
+              {
+                "type": "path",
+                "name": "nestedDim",
+                "expr": "$.nestedData.dim1"
+              },
+              {
+                "type": "path",
+                "name": "listDimFirstItem",
+                "expr": "$.listDim[1]"
+              }
+            ]
+          },
+          "timestampSpec": {
+            "column": "timestamp",
+            "format": "auto"
+          },
+          "dimensionsSpec": {
+            "dimensions": [],
+            "dimensionExclusions": [],
+            "spatialDimensions": []
+          }
+        }
+      },
+      ...
+    },
+    "tuningConfig": &lt;hadoop-tuning-config&gt;
+    }
+  }
+}
+</code></pre>
+<h5><a class="anchor" aria-hidden="true" id="parquet-parser-timeanddims-parsespec"></a><a href="#parquet-parser-timeanddims-parsespec" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a><code>parquet</code> parser, <code>timeAndDims</code> parseSpec</h5>
+<pre><code class="hljs css language-json">{
+  "type": "index_hadoop",
+  "spec": {
+    "ioConfig": {
+      "type": "hadoop",
+      "inputSpec": {
+        "type": "static",
+        "inputFormat": "org.apache.druid.data.input.parquet.DruidParquetInputFormat",
+        "paths": "path/to/file.parquet"
+      },
+      ...
+    },
+    "dataSchema": {
+      "dataSource": "example",
+      "parser": {
+        "type": "parquet",
+        "parseSpec": {
+          "format": "timeAndDims",
+          "timestampSpec": {
+            "column": "timestamp",
+            "format": "auto"
+          },
+          "dimensionsSpec": {
+            "dimensions": [
+              "dim1",
+              "dim2",
+              "dim3",
+              "listDim"
+            ],
+            "dimensionExclusions": [],
+            "spatialDimensions": []
+          }
+        }
+      },
+      ...
+    },
+    "tuningConfig": &lt;hadoop-tuning-config&gt;
+  }
+}
+
+</code></pre>
+<h3><a class="anchor" aria-hidden="true" id="parquet-avro-hadoop-parser"></a><a href="#parquet-avro-hadoop-parser" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Parquet Avro Hadoop Parser</h3>
+<blockquote>
+<p>Consider using the <a href="#parquet-hadoop-parser">Parquet Hadoop Parser</a> over this parser to ingest
+Parquet files. See <a href="#parquet-hadoop-parser-vs-parquet-avro-hadoop-parser">Parquet Hadoop Parser vs Parquet Avro Hadoop Parser</a>
+for the differences between those parsers.</p>
+</blockquote>
+<blockquote>
+<p>You need to include both the <a href="/docs/0.20.0/development/extensions-core/parquet.html"><code>druid-parquet-extensions</code></a>
+[<code>druid-avro-extensions</code>] as extensions to use the Parquet Avro Hadoop Parser.</p>
+</blockquote>
+<p>The Parquet Avro Hadoop Parser is for <a href="/docs/0.20.0/ingestion/hadoop.html">Hadoop batch ingestion</a>.
+This parser first converts the Parquet data into Avro records, and then parses them to ingest into Druid.
+The <code>inputFormat</code> of <code>inputSpec</code> in <code>ioConfig</code> must be set to <code>org.apache.druid.data.input.parquet.DruidParquetAvroInputFormat</code>.</p>
+<p>The Parquet Avro Hadoop Parser supports auto field discovery and flattening if provided with a
+<a href="#flattenspec"><code>flattenSpec</code></a> with the <code>avro</code> <code>parseSpec</code>. Parquet nested list and map
+<a href="https://github.com/apache/parquet-format/blob/master/LogicalTypes.md">logical types</a> <em>should</em> operate correctly with
+JSON path expressions for all supported types. This parser sets a hadoop job property
+<code>parquet.avro.add-list-element-records</code> to <code>false</code> (which normally defaults to <code>true</code>), in order to 'unwrap' primitive
+list elements into multi-value dimensions.</p>
+<p>Note that the <code>int96</code> Parquet value type is not supported with this parser.</p>
+<table>
+<thead>
+<tr><th>Field</th><th>Type</th><th>Description</th><th>Required</th></tr>
+</thead>
+<tbody>
+<tr><td>type</td><td>String</td><td>This should say <code>parquet-avro</code>.</td><td>yes</td></tr>
+<tr><td>parseSpec</td><td>JSON Object</td><td>Specifies the timestamp and dimensions of the data, and optionally, a flatten spec. Should be <code>avro</code>.</td><td>yes</td></tr>
+<tr><td>binaryAsString</td><td>Boolean</td><td>Specifies if the bytes parquet column which is not logically marked as a string or enum type should be treated as a UTF-8 encoded string.</td><td>no(default = false)</td></tr>
+</tbody>
+</table>
+<p>When the time dimension is a <a href="https://github.com/apache/parquet-format/blob/master/LogicalTypes.md">DateType column</a>,
+a format should not be supplied. When the format is UTF8 (String), either <code>auto</code> or
+an explicitly defined <a href="http://www.joda.org/joda-time/apidocs/org/joda/time/format/DateTimeFormat.html">format</a> is required.</p>
+<h4><a class="anchor" aria-hidden="true" id="example"></a><a href="#example" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Example</h4>
+<pre><code class="hljs css language-json">{
+  "type": "index_hadoop",
+  "spec": {
+    "ioConfig": {
+      "type": "hadoop",
+      "inputSpec": {
+        "type": "static",
+        "inputFormat": "org.apache.druid.data.input.parquet.DruidParquetAvroInputFormat",
+        "paths": "path/to/file.parquet"
+      },
+      ...
+    },
+    "dataSchema": {
+      "dataSource": "example",
+      "parser": {
+        "type": "parquet-avro",
+        "parseSpec": {
+          "format": "avro",
+          "flattenSpec": {
+            "useFieldDiscovery": true,
+            "fields": [
+              {
+                "type": "path",
+                "name": "nestedDim",
+                "expr": "$.nestedData.dim1"
+              },
+              {
+                "type": "path",
+                "name": "listDimFirstItem",
+                "expr": "$.listDim[1]"
+              }
+            ]
+          },
+          "timestampSpec": {
+            "column": "timestamp",
+            "format": "auto"
+          },
+          "dimensionsSpec": {
+            "dimensions": [],
+            "dimensionExclusions": [],
+            "spatialDimensions": []
+          }
+        }
+      },
+      ...
+    },
+    "tuningConfig": &lt;hadoop-tuning-config&gt;
+    }
+  }
+}
+</code></pre>
+<h3><a class="anchor" aria-hidden="true" id="avro-stream-parser"></a><a href="#avro-stream-parser" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Avro Stream Parser</h3>
+<blockquote>
+<p>You need to include the <a href="/docs/0.20.0/development/extensions-core/avro.html"><code>druid-avro-extensions</code></a> as an extension to use the Avro Stream Parser.</p>
+</blockquote>
+<p>This parser is for <a href="/docs/0.20.0/ingestion/index.html#streaming">stream ingestion</a> and reads Avro data from a stream directly.</p>
+<table>
+<thead>
+<tr><th>Field</th><th>Type</th><th>Description</th><th>Required</th></tr>
+</thead>
+<tbody>
+<tr><td>type</td><td>String</td><td>This should say <code>avro_stream</code>.</td><td>no</td></tr>
+<tr><td>avroBytesDecoder</td><td>JSON Object</td><td>Specifies how to decode bytes to Avro record.</td><td>yes</td></tr>
+<tr><td>parseSpec</td><td>JSON Object</td><td>Specifies the timestamp and dimensions of the data. Should be an &quot;avro&quot; parseSpec.</td><td>yes</td></tr>
+</tbody>
+</table>
+<p>An Avro parseSpec can contain a <a href="#flattenspec"><code>flattenSpec</code></a> using either the &quot;root&quot; or &quot;path&quot;
+field types, which can be used to read nested Avro records. The &quot;jq&quot; field type is not currently supported for Avro.</p>
+<p>For example, using Avro stream parser with schema repo Avro bytes decoder:</p>
+<pre><code class="hljs css language-json">"parser" : {
+  "type" : "avro_stream",
+  "avroBytesDecoder" : {
+    "type" : "schema_repo",
+    "subjectAndIdConverter" : {
+      "type" : "avro_1124",
+      "topic" : "${YOUR_TOPIC}"
+    },
+    "schemaRepository" : {
+      "type" : "avro_1124_rest_client",
+      "url" : "${YOUR_SCHEMA_REPO_END_POINT}",
+    }
+  },
+  "parseSpec" : {
+    "format": "avro",
+    "timestampSpec": &lt;standard timestampSpec&gt;,
+    "dimensionsSpec": &lt;standard dimensionsSpec&gt;,
+    "flattenSpec": &lt;optional&gt;
+  }
+}
+</code></pre>
+<h4><a class="anchor" aria-hidden="true" id="avro-bytes-decoder"></a><a href="#avro-bytes-decoder" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Avro Bytes Decoder</h4>
+<p>If <code>type</code> is not included, the avroBytesDecoder defaults to <code>schema_repo</code>.</p>
+<h5><a class="anchor" aria-hidden="true" id="inline-schema-based-avro-bytes-decoder"></a><a href="#inline-schema-based-avro-bytes-decoder" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Inline Schema Based Avro Bytes Decoder</h5>
+<blockquote>
+<p>The &quot;schema_inline&quot; decoder reads Avro records using a fixed schema and does not support schema migration. If you
+may need to migrate schemas in the future, consider one of the other decoders, all of which use a message header that
+allows the parser to identify the proper Avro schema for reading records.</p>
+</blockquote>
+<p>This decoder can be used if all the input events can be read using the same schema. In this case, specify the schema in the input task JSON itself, as described below.</p>
+<pre><code class="hljs"><span class="hljs-string">...</span>
+<span class="hljs-string">"avroBytesDecoder"</span>: {
+  <span class="hljs-string">"type"</span>: <span class="hljs-string">"schema_inline"</span>,
+  <span class="hljs-string">"schema"</span>: {
+    <span class="hljs-string">//your</span> schema goes here, for example
+    <span class="hljs-string">"namespace"</span>: <span class="hljs-string">"org.apache.druid.data"</span>,
+    <span class="hljs-string">"name"</span>: <span class="hljs-string">"User"</span>,
+    <span class="hljs-string">"type"</span>: <span class="hljs-string">"record"</span>,
+    <span class="hljs-string">"fields"</span>: [
+      { <span class="hljs-string">"name"</span>: <span class="hljs-string">"FullName"</span>, <span class="hljs-string">"type"</span>: <span class="hljs-string">"string"</span> },
+      { <span class="hljs-string">"name"</span>: <span class="hljs-string">"Country"</span>, <span class="hljs-string">"type"</span>: <span class="hljs-string">"string"</span> }
+    ]
+  }
+}
+<span class="hljs-string">...</span>
+</code></pre>
+<h5><a class="anchor" aria-hidden="true" id="multiple-inline-schemas-based-avro-bytes-decoder"></a><a href="#multiple-inline-schemas-based-avro-bytes-decoder" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Multiple Inline Schemas Based Avro Bytes Decoder</h5>
+<p>Use this decoder if different input events can have different read schemas. In this case, specify the schema in the input task JSON itself, as described below.</p>
+<pre><code class="hljs">...
+<span class="hljs-string">"avroBytesDecoder"</span>: {
+  <span class="hljs-string">"type"</span>: <span class="hljs-string">"multiple_schemas_inline"</span>,
+  <span class="hljs-string">"schemas"</span>: {
+    //your id -&gt; schema map goes here, for example
+    <span class="hljs-string">"1"</span>: {
+      <span class="hljs-string">"namespace"</span>: <span class="hljs-string">"org.apache.druid.data"</span>,
+      <span class="hljs-string">"name"</span>: <span class="hljs-string">"User"</span>,
+      <span class="hljs-string">"type"</span>: <span class="hljs-string">"record"</span>,
+      <span class="hljs-string">"fields"</span>: [
+        { <span class="hljs-string">"name"</span>: <span class="hljs-string">"FullName"</span>, <span class="hljs-string">"type"</span>: <span class="hljs-string">"string"</span> },
+        { <span class="hljs-string">"name"</span>: <span class="hljs-string">"Country"</span>, <span class="hljs-string">"type"</span>: <span class="hljs-string">"string"</span> }
+      ]
+    },
+    <span class="hljs-string">"2"</span>: {
+      <span class="hljs-string">"namespace"</span>: <span class="hljs-string">"org.apache.druid.otherdata"</span>,
+      <span class="hljs-string">"name"</span>: <span class="hljs-string">"UserIdentity"</span>,
+      <span class="hljs-string">"type"</span>: <span class="hljs-string">"record"</span>,
+      <span class="hljs-string">"fields"</span>: [
+        { <span class="hljs-string">"name"</span>: <span class="hljs-string">"Name"</span>, <span class="hljs-string">"type"</span>: <span class="hljs-string">"string"</span> },
+        { <span class="hljs-string">"name"</span>: <span class="hljs-string">"Location"</span>, <span class="hljs-string">"type"</span>: <span class="hljs-string">"string"</span> }
+      ]
+    },
+    ...
+    ...
+  }
+}
+...
+</code></pre>
+<p>Note that it is essentially a map of integer schema ID to avro schema object. This parser assumes that record has following format.
+first 1 byte is version and must always be 1.
+next 4 bytes are integer schema ID serialized using big-endian byte order.
+remaining bytes contain serialized avro message.</p>
+<h5><a class="anchor" aria-hidden="true" id="schemarepo-based-avro-bytes-decoder"></a><a href="#schemarepo-based-avro-bytes-decoder" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>SchemaRepo Based Avro Bytes Decoder</h5>
+<p>This Avro bytes decoder first extracts <code>subject</code> and <code>id</code> from the input message bytes, and then uses them to look up the Avro schema used to decode the Avro record from bytes. For details, see the <a href="https://github.com/schema-repo/schema-repo">schema repo</a> and <a href="https://issues.apache.org/jira/browse/AVRO-1124">AVRO-1124</a>. You will need an http service like schema repo to hold the avro schema. For information on registering a schema on the message producer side, see <code>org.apache.druid.data.input.AvroStreamInputRowParserTest#testParse()</code>.</p>
+<table>
+<thead>
+<tr><th>Field</th><th>Type</th><th>Description</th><th>Required</th></tr>
+</thead>
+<tbody>
+<tr><td>type</td><td>String</td><td>This should say <code>schema_repo</code>.</td><td>no</td></tr>
+<tr><td>subjectAndIdConverter</td><td>JSON Object</td><td>Specifies how to extract the subject and id from message bytes.</td><td>yes</td></tr>
+<tr><td>schemaRepository</td><td>JSON Object</td><td>Specifies how to look up the Avro schema from subject and id.</td><td>yes</td></tr>
+</tbody>
+</table>
+<h6><a class="anchor" aria-hidden="true" id="avro-1124-subject-and-id-converter"></a><a href="#avro-1124-subject-and-id-converter" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Avro-1124 Subject And Id Converter</h6>
+<p>This section describes the format of the <code>subjectAndIdConverter</code> object for the <code>schema_repo</code> Avro bytes decoder.</p>
+<table>
+<thead>
+<tr><th>Field</th><th>Type</th><th>Description</th><th>Required</th></tr>
+</thead>
+<tbody>
+<tr><td>type</td><td>String</td><td>This should say <code>avro_1124</code>.</td><td>no</td></tr>
+<tr><td>topic</td><td>String</td><td>Specifies the topic of your Kafka stream.</td><td>yes</td></tr>
+</tbody>
+</table>
+<h6><a class="anchor" aria-hidden="true" id="avro-1124-schema-repository"></a><a href="#avro-1124-schema-repository" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Avro-1124 Schema Repository</h6>
+<p>This section describes the format of the <code>schemaRepository</code> object for the <code>schema_repo</code> Avro bytes decoder.</p>
+<table>
+<thead>
+<tr><th>Field</th><th>Type</th><th>Description</th><th>Required</th></tr>
+</thead>
+<tbody>
+<tr><td>type</td><td>String</td><td>This should say <code>avro_1124_rest_client</code>.</td><td>no</td></tr>
+<tr><td>url</td><td>String</td><td>Specifies the endpoint url of your Avro-1124 schema repository.</td><td>yes</td></tr>
+</tbody>
+</table>
+<h5><a class="anchor" aria-hidden="true" id="confluent-schema-registry-based-avro-bytes-decoder"></a><a href="#confluent-schema-registry-based-avro-bytes-decoder" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Confluent Schema Registry-based Avro Bytes Decoder</h5>
+<p>This Avro bytes decoder first extracts a unique <code>id</code> from input message bytes, and then uses it to look up the schema in the Schema Registry used to decode the Avro record from bytes.
+For details, see the Schema Registry <a href="http://docs.confluent.io/current/schema-registry/docs/">documentation</a> and <a href="https://github.com/confluentinc/schema-registry">repository</a>.</p>
+<table>
+<thead>
+<tr><th>Field</th><th>Type</th><th>Description</th><th>Required</th></tr>
+</thead>
+<tbody>
+<tr><td>type</td><td>String</td><td>This should say <code>schema_registry</code>.</td><td>no</td></tr>
+<tr><td>url</td><td>String</td><td>Specifies the url endpoint of the Schema Registry.</td><td>yes</td></tr>
+<tr><td>capacity</td><td>Integer</td><td>Specifies the max size of the cache (default = Integer.MAX_VALUE).</td><td>no</td></tr>
+</tbody>
+</table>
+<pre><code class="hljs css language-json">...
+"avroBytesDecoder" : {
+   "type" : "schema_registry",
+   "url" : &lt;schema-registry-url&gt;
+}
+...
+</code></pre>
+<h3><a class="anchor" aria-hidden="true" id="protobuf-parser"></a><a href="#protobuf-parser" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Protobuf Parser</h3>
+<blockquote>
+<p>You need to include the <a href="/docs/0.20.0/development/extensions-core/protobuf.html"><code>druid-protobuf-extensions</code></a> as an extension to use the Protobuf Parser.</p>
+</blockquote>
+<p>This parser is for <a href="/docs/0.20.0/ingestion/index.html#streaming">stream ingestion</a> and reads Protocol buffer data from a stream directly.</p>
+<table>
+<thead>
+<tr><th>Field</th><th>Type</th><th>Description</th><th>Required</th></tr>
+</thead>
+<tbody>
+<tr><td>type</td><td>String</td><td>This should say <code>protobuf</code>.</td><td>yes</td></tr>
+<tr><td>descriptor</td><td>String</td><td>Protobuf descriptor file name in the classpath or URL.</td><td>yes</td></tr>
+<tr><td>protoMessageType</td><td>String</td><td>Protobuf message type in the descriptor.  Both short name and fully qualified name are accepted.  The parser uses the first message type found in the descriptor if not specified.</td><td>no</td></tr>
+<tr><td>parseSpec</td><td>JSON Object</td><td>Specifies the timestamp and dimensions of the data.  The format must be JSON. See <a href="/docs/0.20.0/ingestion/index.html">JSON ParseSpec</a> for more configuration options.  Note that timeAndDims parseSpec is no longer supported.</td><td>yes</td></tr>
+</tbody>
+</table>
+<p>Sample spec:</p>
+<pre><code class="hljs css language-json">"parser": {
+  "type": "protobuf",
+  "descriptor": "file:///tmp/metrics.desc",
+  "protoMessageType": "Metrics",
+  "parseSpec": {
+    "format": "json",
+    "timestampSpec": {
+      "column": "timestamp",
+      "format": "auto"
+    },
+    "dimensionsSpec": {
+      "dimensions": [
+        "unit",
+        "http_method",
+        "http_code",
+        "page",
+        "metricType",
+        "server"
+      ],
+      "dimensionExclusions": [
+        "timestamp",
+        "value"
+      ]
+    }
+  }
+}
+</code></pre>
+<p>See the <a href="/docs/0.20.0/development/extensions-core/protobuf.html">extension description</a> for
+more details and examples.</p>
+<h2><a class="anchor" aria-hidden="true" id="parsespec"></a><a href="#parsespec" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>ParseSpec</h2>
+<blockquote>
+<p>The Parser is deprecated for <a href="/docs/0.20.0/ingestion/native-batch.html">native batch tasks</a>, <a href="/docs/0.20.0/development/extensions-core/kafka-ingestion.html">Kafka indexing service</a>,
+and <a href="/docs/0.20.0/development/extensions-core/kinesis-ingestion.html">Kinesis indexing service</a>.
+Consider using the <a href="#input-format">input format</a> instead for these types of ingestion.</p>
+</blockquote>
+<p>ParseSpecs serve two purposes:</p>
+<ul>
+<li>The String Parser use them to determine the format (i.e., JSON, CSV, TSV) of incoming rows.</li>
+<li>All Parsers use them to determine the timestamp and dimensions of incoming rows.</li>
+</ul>
+<p>If <code>format</code> is not included, the parseSpec defaults to <code>tsv</code>.</p>
+<h3><a class="anchor" aria-hidden="true" id="json-parsespec"></a><a href="#json-parsespec" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>JSON ParseSpec</h3>
+<p>Use this with the String Parser to load JSON.</p>
+<table>
+<thead>
+<tr><th>Field</th><th>Type</th><th>Description</th><th>Required</th></tr>
+</thead>
+<tbody>
+<tr><td>format</td><td>String</td><td>This should say <code>json</code>.</td><td>no</td></tr>
+<tr><td>timestampSpec</td><td>JSON Object</td><td>Specifies the column and format of the timestamp.</td><td>yes</td></tr>
+<tr><td>dimensionsSpec</td><td>JSON Object</td><td>Specifies the dimensions of the data.</td><td>yes</td></tr>
+<tr><td>flattenSpec</td><td>JSON Object</td><td>Specifies flattening configuration for nested JSON data. See <a href="#flattenspec"><code>flattenSpec</code></a> for more info.</td><td>no</td></tr>
+</tbody>
+</table>
+<p>Sample spec:</p>
+<pre><code class="hljs css language-json">"parseSpec": {
+  "format" : "json",
+  "timestampSpec" : {
+    "column" : "timestamp"
+  },
+  "dimensionSpec" : {
+    "dimensions" : ["page","language","user","unpatrolled","newPage","robot","anonymous","namespace","continent","country","region","city"]
+  }
+}
+</code></pre>
+<h3><a class="anchor" aria-hidden="true" id="json-lowercase-parsespec"></a><a href="#json-lowercase-parsespec" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>JSON Lowercase ParseSpec</h3>
+<blockquote>
+<p>The <em>jsonLowercase</em> parser is deprecated and may be removed in a future version of Druid.</p>
+</blockquote>
+<p>This is a special variation of the JSON ParseSpec that lower cases all the column names in the incoming JSON data. This parseSpec is required if you are updating to Druid 0.7.x from Druid 0.6.x, are directly ingesting JSON with mixed case column names, do not have any ETL in place to lower case those column names, and would like to make queries that include the data you created using 0.6.x and 0.7.x.</p>
+<table>
+<thead>
+<tr><th>Field</th><th>Type</th><th>Description</th><th>Required</th></tr>
+</thead>
+<tbody>
+<tr><td>format</td><td>String</td><td>This should say <code>jsonLowercase</code>.</td><td>yes</td></tr>
+<tr><td>timestampSpec</td><td>JSON Object</td><td>Specifies the column and format of the timestamp.</td><td>yes</td></tr>
+<tr><td>dimensionsSpec</td><td>JSON Object</td><td>Specifies the dimensions of the data.</td><td>yes</td></tr>
+</tbody>
+</table>
+<h3><a class="anchor" aria-hidden="true" id="csv-parsespec"></a><a href="#csv-parsespec" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>CSV ParseSpec</h3>
+<p>Use this with the String Parser to load CSV. Strings are parsed using the com.opencsv library.</p>
+<table>
+<thead>
+<tr><th>Field</th><th>Type</th><th>Description</th><th>Required</th></tr>
+</thead>
+<tbody>
+<tr><td>format</td><td>String</td><td>This should say <code>csv</code>.</td><td>yes</td></tr>
+<tr><td>timestampSpec</td><td>JSON Object</td><td>Specifies the column and format of the timestamp.</td><td>yes</td></tr>
+<tr><td>dimensionsSpec</td><td>JSON Object</td><td>Specifies the dimensions of the data.</td><td>yes</td></tr>
+<tr><td>listDelimiter</td><td>String</td><td>A custom delimiter for multi-value dimensions.</td><td>no (default = ctrl+A)</td></tr>
+<tr><td>columns</td><td>JSON array</td><td>Specifies the columns of the data.</td><td>yes</td></tr>
+</tbody>
+</table>
+<p>Sample spec:</p>
+<pre><code class="hljs css language-json">"parseSpec": {
+  "format" : "csv",
+  "timestampSpec" : {
+    "column" : "timestamp"
+  },
+  "columns" : ["timestamp","page","language","user","unpatrolled","newPage","robot","anonymous","namespace","continent","country","region","city","added","deleted","delta"],
+  "dimensionsSpec" : {
+    "dimensions" : ["page","language","user","unpatrolled","newPage","robot","anonymous","namespace","continent","country","region","city"]
+  }
+}
+</code></pre>
+<h4><a class="anchor" aria-hidden="true" id="csv-index-tasks"></a><a href="#csv-index-tasks" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>CSV Index Tasks</h4>
+<p>If your input files contain a header, the <code>columns</code> field is optional and you don't need to set.
+Instead, you can set the <code>hasHeaderRow</code> field to true, which makes Druid automatically extract the column information from the header.
+Otherwise, you must set the <code>columns</code> field and ensure that field must match the columns of your input data in the same order.</p>
+<p>Also, you can skip some header rows by setting <code>skipHeaderRows</code> in your parseSpec. If both <code>skipHeaderRows</code> and <code>hasHeaderRow</code> options are set,
+<code>skipHeaderRows</code> is first applied. For example, if you set <code>skipHeaderRows</code> to 2 and <code>hasHeaderRow</code> to true, Druid will
+skip the first two lines and then extract column information from the third line.</p>
+<p>Note that <code>hasHeaderRow</code> and <code>skipHeaderRows</code> are effective only for non-Hadoop batch index tasks. Other types of index
+tasks will fail with an exception.</p>
+<h4><a class="anchor" aria-hidden="true" id="other-csv-ingestion-tasks"></a><a href="#other-csv-ingestion-tasks" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Other CSV Ingestion Tasks</h4>
+<p>The <code>columns</code> field must be included and and ensure that the order of the fields matches the columns of your input data in the same order.</p>
+<h3><a class="anchor" aria-hidden="true" id="tsv--delimited-parsespec"></a><a href="#tsv--delimited-parsespec" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>TSV / Delimited ParseSpec</h3>
+<p>Use this with the String Parser to load any delimited text that does not require special escaping. By default,
+the delimiter is a tab, so this will load TSV.</p>
+<table>
+<thead>
+<tr><th>Field</th><th>Type</th><th>Description</th><th>Required</th></tr>
+</thead>
+<tbody>
+<tr><td>format</td><td>String</td><td>This should say <code>tsv</code>.</td><td>yes</td></tr>
+<tr><td>timestampSpec</td><td>JSON Object</td><td>Specifies the column and format of the timestamp.</td><td>yes</td></tr>
+<tr><td>dimensionsSpec</td><td>JSON Object</td><td>Specifies the dimensions of the data.</td><td>yes</td></tr>
+<tr><td>delimiter</td><td>String</td><td>A custom delimiter for data values.</td><td>no (default = \t)</td></tr>
+<tr><td>listDelimiter</td><td>String</td><td>A custom delimiter for multi-value dimensions.</td><td>no (default = ctrl+A)</td></tr>
+<tr><td>columns</td><td>JSON String array</td><td>Specifies the columns of the data.</td><td>yes</td></tr>
+</tbody>
+</table>
+<p>Sample spec:</p>
+<pre><code class="hljs css language-json">"parseSpec": {
+  "format" : "tsv",
+  "timestampSpec" : {
+    "column" : "timestamp"
+  },
+  "columns" : ["timestamp","page","language","user","unpatrolled","newPage","robot","anonymous","namespace","continent","country","region","city","added","deleted","delta"],
+  "delimiter":"|",
+  "dimensionsSpec" : {
+    "dimensions" : ["page","language","user","unpatrolled","newPage","robot","anonymous","namespace","continent","country","region","city"]
+  }
+}
+</code></pre>
+<p>Be sure to change the <code>delimiter</code> to the appropriate delimiter for your data. Like CSV, you must specify the columns and which subset of the columns you want indexed.</p>
+<h4><a class="anchor" aria-hidden="true" id="tsv-delimited-index-tasks"></a><a href="#tsv-delimited-index-tasks" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>TSV (Delimited) Index Tasks</h4>
+<p>If your input files contain a header, the <code>columns</code> field is optional and doesn't need to be set.
+Instead, you can set the <code>hasHeaderRow</code> field to true, which makes Druid automatically extract the column information from the header.
+Otherwise, you must set the <code>columns</code> field and ensure that field must match the columns of your input data in the same order.</p>
+<p>Also, you can skip some header rows by setting <code>skipHeaderRows</code> in your parseSpec. If both <code>skipHeaderRows</code> and <code>hasHeaderRow</code> options are set,
+<code>skipHeaderRows</code> is first applied. For example, if you set <code>skipHeaderRows</code> to 2 and <code>hasHeaderRow</code> to true, Druid will
+skip the first two lines and then extract column information from the third line.</p>
+<p>Note that <code>hasHeaderRow</code> and <code>skipHeaderRows</code> are effective only for non-Hadoop batch index tasks. Other types of index
+tasks will fail with an exception.</p>
+<h4><a class="anchor" aria-hidden="true" id="other-tsv-delimited-ingestion-tasks"></a><a href="#other-tsv-delimited-ingestion-tasks" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Other TSV (Delimited) Ingestion Tasks</h4>
+<p>The <code>columns</code> field must be included and and ensure that the order of the fields matches the columns of your input data in the same order.</p>
+<h3><a class="anchor" aria-hidden="true" id="multi-value-dimensions"></a><a href="#multi-value-dimensions" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Multi-value dimensions</h3>
+<p>Dimensions can have multiple values for TSV and CSV data. To specify the delimiter for a multi-value dimension, set the <code>listDelimiter</code> in the <code>parseSpec</code>.</p>
+<p>JSON data can contain multi-value dimensions as well. The multiple values for a dimension must be formatted as a JSON array in the ingested data. No additional <code>parseSpec</code> configuration is needed.</p>
+<h3><a class="anchor" aria-hidden="true" id="regex-parsespec"></a><a href="#regex-parsespec" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Regex ParseSpec</h3>
+<pre><code class="hljs css language-json">"parseSpec":{
+  "format" : "regex",
+  "timestampSpec" : {
+    "column" : "timestamp"
+  },
+  "dimensionsSpec" : {
+    "dimensions" : [&lt;your_list_of_dimensions&gt;]
+  },
+  "columns" : [&lt;your_columns_here&gt;],
+  "pattern" : &lt;regex pattern for partitioning data&gt;
+}
+</code></pre>
+<p>The <code>columns</code> field must match the columns of your regex matching groups in the same order. If columns are not provided, default
+columns names (&quot;column_1&quot;, &quot;column2&quot;, ... &quot;column_n&quot;) will be assigned. Ensure that your column names include all your dimensions.</p>
+<h3><a class="anchor" aria-hidden="true" id="javascript-parsespec"></a><a href="#javascript-parsespec" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>JavaScript ParseSpec</h3>
+<pre><code class="hljs css language-json">"parseSpec":{
+  "format" : "javascript",
+  "timestampSpec" : {
+    "column" : "timestamp"
+  },
+  "dimensionsSpec" : {
+    "dimensions" : ["page","language","user","unpatrolled","newPage","robot","anonymous","namespace","continent","country","region","city"]
+  },
+  "function" : "function(str) { var parts = str.split(\"-\"); return { one: parts[0], two: parts[1] } }"
+}
+</code></pre>
+<p>Note with the JavaScript parser that data must be fully parsed and returned as a <code>{key:value}</code> format in the JS logic.
+This means any flattening or parsing multi-dimensional values must be done here.</p>
+<blockquote>
+<p>JavaScript-based functionality is disabled by default. Please refer to the Druid <a href="/docs/0.20.0/development/javascript.html">JavaScript programming guide</a> for guidelines about using Druid's JavaScript functionality, including instructions on how to enable it.</p>
+</blockquote>
+<h3><a class="anchor" aria-hidden="true" id="timeanddims-parsespec"></a><a href="#timeanddims-parsespec" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>TimeAndDims ParseSpec</h3>
+<p>Use this with non-String Parsers to provide them with timestamp and dimensions information. Non-String Parsers
+handle all formatting decisions on their own, without using the ParseSpec.</p>
+<table>
+<thead>
+<tr><th>Field</th><th>Type</th><th>Description</th><th>Required</th></tr>
+</thead>
+<tbody>
+<tr><td>format</td><td>String</td><td>This should say <code>timeAndDims</code>.</td><td>yes</td></tr>
+<tr><td>timestampSpec</td><td>JSON Object</td><td>Specifies the column and format of the timestamp.</td><td>yes</td></tr>
+<tr><td>dimensionsSpec</td><td>JSON Object</td><td>Specifies the dimensions of the data.</td><td>yes</td></tr>
+</tbody>
+</table>
+<h3><a class="anchor" aria-hidden="true" id="orc-parsespec"></a><a href="#orc-parsespec" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Orc ParseSpec</h3>
+<p>Use this with the Hadoop ORC Parser to load ORC files.</p>
+<table>
+<thead>
+<tr><th>Field</th><th>Type</th><th>Description</th><th>Required</th></tr>
+</thead>
+<tbody>
+<tr><td>format</td><td>String</td><td>This should say <code>orc</code>.</td><td>no</td></tr>
+<tr><td>timestampSpec</td><td>JSON Object</td><td>Specifies the column and format of the timestamp.</td><td>yes</td></tr>
+<tr><td>dimensionsSpec</td><td>JSON Object</td><td>Specifies the dimensions of the data.</td><td>yes</td></tr>
+<tr><td>flattenSpec</td><td>JSON Object</td><td>Specifies flattening configuration for nested JSON data. See <a href="#flattenspec"><code>flattenSpec</code></a> for more info.</td><td>no</td></tr>
+</tbody>
+</table>
+<h3><a class="anchor" aria-hidden="true" id="parquet-parsespec"></a><a href="#parquet-parsespec" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Parquet ParseSpec</h3>
+<p>Use this with the Hadoop Parquet Parser to load Parquet files.</p>
+<table>
+<thead>
+<tr><th>Field</th><th>Type</th><th>Description</th><th>Required</th></tr>
+</thead>
+<tbody>
+<tr><td>format</td><td>String</td><td>This should say <code>parquet</code>.</td><td>no</td></tr>
+<tr><td>timestampSpec</td><td>JSON Object</td><td>Specifies the column and format of the timestamp.</td><td>yes</td></tr>
+<tr><td>dimensionsSpec</td><td>JSON Object</td><td>Specifies the dimensions of the data.</td><td>yes</td></tr>
+<tr><td>flattenSpec</td><td>JSON Object</td><td>Specifies flattening configuration for nested JSON data. See <a href="#flattenspec"><code>flattenSpec</code></a> for more info.</td><td>no</td></tr>
+</tbody>
+</table>
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+<h2><a class="anchor" aria-hidden="true" id="schema-changes"></a><a href="#schema-changes" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Schema changes</h2>
+<p>Schemas for datasources can change at any time and Apache Druid supports different schemas among segments.</p>
+<h3><a class="anchor" aria-hidden="true" id="replacing-segments"></a><a href="#replacing-segments" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Replacing segments</h3>
+<p>Druid uniquely
+identifies segments using the datasource, interval, version, and partition number. The partition number is only visible in the segment id if
+there are multiple segments created for some granularity of time. For example, if you have hourly segments, but you
+have more data in an hour than a single segment can hold, you can create multiple segments for the same hour. These segments will share
+the same datasource, interval, and version, but have linearly increasing partition numbers.</p>
+<pre><code class="hljs">foo_2015<span class="hljs-number">-01</span><span class="hljs-number">-01</span>/<span class="hljs-number">2015</span><span class="hljs-number">-01</span><span class="hljs-number">-02</span>_v1_0
+foo_2015<span class="hljs-number">-01</span><span class="hljs-number">-01</span>/<span class="hljs-number">2015</span><span class="hljs-number">-01</span><span class="hljs-number">-02</span>_v1_1
+foo_2015<span class="hljs-number">-01</span><span class="hljs-number">-01</span>/<span class="hljs-number">2015</span><span class="hljs-number">-01</span><span class="hljs-number">-02</span>_v1_2
+</code></pre>
+<p>In the example segments above, the dataSource = foo, interval = 2015-01-01/2015-01-02, version = v1, partitionNum = 0.
+If at some later point in time, you reindex the data with a new schema, the newly created segments will have a higher version id.</p>
+<pre><code class="hljs">foo_2015<span class="hljs-number">-01</span><span class="hljs-number">-01</span>/<span class="hljs-number">2015</span><span class="hljs-number">-01</span><span class="hljs-number">-02</span>_v2_0
+foo_2015<span class="hljs-number">-01</span><span class="hljs-number">-01</span>/<span class="hljs-number">2015</span><span class="hljs-number">-01</span><span class="hljs-number">-02</span>_v2_1
+foo_2015<span class="hljs-number">-01</span><span class="hljs-number">-01</span>/<span class="hljs-number">2015</span><span class="hljs-number">-01</span><span class="hljs-number">-02</span>_v2_2
+</code></pre>
+<p>Druid batch indexing (either Hadoop-based or IndexTask-based) guarantees atomic updates on an interval-by-interval basis.
+In our example, until all <code>v2</code> segments for <code>2015-01-01/2015-01-02</code> are loaded in a Druid cluster, queries exclusively use <code>v1</code> segments.
+Once all <code>v2</code> segments are loaded and queryable, all queries ignore <code>v1</code> segments and switch to the <code>v2</code> segments.
+Shortly afterwards, the <code>v1</code> segments are unloaded from the cluster.</p>
+<p>Note that updates that span multiple segment intervals are only atomic within each interval. They are not atomic across the entire update.
+For example, you have segments such as the following:</p>
+<pre><code class="hljs">foo_2015<span class="hljs-number">-01</span><span class="hljs-number">-01</span>/<span class="hljs-number">2015</span><span class="hljs-number">-01</span><span class="hljs-number">-02</span>_v1_0
+foo_2015<span class="hljs-number">-01</span><span class="hljs-number">-02</span>/<span class="hljs-number">2015</span><span class="hljs-number">-01</span><span class="hljs-number">-03</span>_v1_1
+foo_2015<span class="hljs-number">-01</span><span class="hljs-number">-03</span>/<span class="hljs-number">2015</span><span class="hljs-number">-01</span><span class="hljs-number">-04</span>_v1_2
+</code></pre>
+<p><code>v2</code> segments will be loaded into the cluster as soon as they are built and replace <code>v1</code> segments for the period of time the
+segments overlap. Before v2 segments are completely loaded, your cluster may have a mixture of <code>v1</code> and <code>v2</code> segments.</p>
+<pre><code class="hljs">foo_2015<span class="hljs-number">-01</span><span class="hljs-number">-01</span>/<span class="hljs-number">2015</span><span class="hljs-number">-01</span><span class="hljs-number">-02</span>_v1_0
+foo_2015<span class="hljs-number">-01</span><span class="hljs-number">-02</span>/<span class="hljs-number">2015</span><span class="hljs-number">-01</span><span class="hljs-number">-03</span>_v2_1
+foo_2015<span class="hljs-number">-01</span><span class="hljs-number">-03</span>/<span class="hljs-number">2015</span><span class="hljs-number">-01</span><span class="hljs-number">-04</span>_v1_2
+</code></pre>
+<p>In this case, queries may hit a mixture of <code>v1</code> and <code>v2</code> segments.</p>
+<h3><a class="anchor" aria-hidden="true" id="different-schemas-among-segments"></a><a href="#different-schemas-among-segments" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Different schemas among segments</h3>
+<p>Druid segments for the same datasource may have different schemas. If a string column (dimension) exists in one segment but not
+another, queries that involve both segments still work. Queries for the segment missing the dimension will behave as if the dimension has only null values.
+Similarly, if one segment has a numeric column (metric) but another does not, queries on the segment missing the
+metric will generally &quot;do the right thing&quot;. Aggregations over this missing metric behave as if the metric were missing.</p>
+<p><a name="compact"></a></p>
+<h2><a class="anchor" aria-hidden="true" id="compaction-and-reindexing"></a><a href="#compaction-and-reindexing" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Compaction and reindexing</h2>
+<p>Compaction is a type of overwrite operation, which reads an existing set of segments, combines them into a new set with larger but fewer segments, and overwrites the original set with the new compacted set, without changing the data that is stored.</p>
+<p>For performance reasons, it is sometimes beneficial to compact a set of segments into a set of larger but fewer segments, as there is some per-segment processing and memory overhead in both the ingestion and querying paths.</p>
+<p>Compaction tasks merge all segments of the given interval. The syntax is:</p>
+<pre><code class="hljs css language-json">{
+    "type": "compact",
+    "id": &lt;task_id&gt;,
+    "dataSource": &lt;task_datasource&gt;,
+    "ioConfig": &lt;IO config&gt;,
+    "dimensionsSpec" &lt;custom dimensionsSpec&gt;,
+    "metricsSpec" &lt;custom metricsSpec&gt;,
+    "segmentGranularity": &lt;segment granularity after compaction&gt;,
+    "tuningConfig" &lt;parallel indexing task tuningConfig&gt;,
+    "context": &lt;task context&gt;
+}
+</code></pre>
+<table>
+<thead>
+<tr><th>Field</th><th>Description</th><th>Required</th></tr>
+</thead>
+<tbody>
+<tr><td><code>type</code></td><td>Task type. Should be <code>compact</code></td><td>Yes</td></tr>
+<tr><td><code>id</code></td><td>Task id</td><td>No</td></tr>
+<tr><td><code>dataSource</code></td><td>DataSource name to be compacted</td><td>Yes</td></tr>
+<tr><td><code>ioConfig</code></td><td>ioConfig for compaction task. See <a href="#compaction-ioconfig">Compaction IOConfig</a> for details.</td><td>Yes</td></tr>
+<tr><td><code>dimensionsSpec</code></td><td>Custom dimensionsSpec. Compaction task will use this dimensionsSpec if exist instead of generating one. See below for more details.</td><td>No</td></tr>
+<tr><td><code>metricsSpec</code></td><td>Custom metricsSpec. Compaction task will use this metricsSpec if specified rather than generating one.</td><td>No</td></tr>
+<tr><td><code>segmentGranularity</code></td><td>If this is set, compactionTask will change the segment granularity for the given interval. See <code>segmentGranularity</code> of <a href="/docs/0.20.0/ingestion/index.html#granularityspec"><code>granularitySpec</code></a> for more details. See the below table for the behavior.</td><td>No</td></tr>
+<tr><td><code>tuningConfig</code></td><td><a href="/docs/0.20.0/ingestion/native-batch.html#tuningconfig">Parallel indexing task tuningConfig</a></td><td>No</td></tr>
+<tr><td><code>context</code></td><td><a href="/docs/0.20.0/ingestion/tasks.html#context">Task context</a></td><td>No</td></tr>
+</tbody>
+</table>
+<p>An example of compaction task is</p>
+<pre><code class="hljs css language-json">{
+  <span class="hljs-attr">"type"</span> : <span class="hljs-string">"compact"</span>,
+  <span class="hljs-attr">"dataSource"</span> : <span class="hljs-string">"wikipedia"</span>,
+  <span class="hljs-attr">"ioConfig"</span> : {
+    <span class="hljs-attr">"type"</span>: <span class="hljs-string">"compact"</span>,
+    <span class="hljs-attr">"inputSpec"</span>: {
+      <span class="hljs-attr">"type"</span>: <span class="hljs-string">"interval"</span>,
+      <span class="hljs-attr">"interval"</span>: <span class="hljs-string">"2017-01-01/2018-01-01"</span>
+    }
+  }
+}
+</code></pre>
+<p>This compaction task reads <em>all segments</em> of the interval <code>2017-01-01/2018-01-01</code> and results in new segments.
+Since <code>segmentGranularity</code> is null, the original segment granularity will be remained and not changed after compaction.
+To control the number of result segments per time chunk, you can set <a href="../configuration/index.html#compaction-dynamic-configuration">maxRowsPerSegment</a> or <a href="/docs/0.20.0/ingestion/native-batch.html#tuningconfig">numShards</a>.
+Please note that you can run multiple compactionTasks at the same time. For example, you can run 12 compactionTasks per month instead of running a single task for the entire year.</p>
+<p>A compaction task internally generates an <code>index</code> task spec for performing compaction work with some fixed parameters.
+For example, its <code>inputSource</code> is always the <a href="/docs/0.20.0/ingestion/native-batch.html#druid-input-source">DruidInputSource</a>, and <code>dimensionsSpec</code> and <code>metricsSpec</code>
+include all dimensions and metrics of the input segments by default.</p>
+<p>Compaction tasks will exit with a failure status code, without doing anything, if the interval you specify has no
+data segments loaded in it (or if the interval you specify is empty).</p>
+<p>The output segment can have different metadata from the input segments unless all input segments have the same metadata.</p>
+<ul>
+<li>Dimensions: since Apache Druid supports schema change, the dimensions can be different across segments even if they are a part of the same dataSource.
+If the input segments have different dimensions, the output segment basically includes all dimensions of the input segments.
+However, even if the input segments have the same set of dimensions, the dimension order or the data type of dimensions can be different. For example, the data type of some dimensions can be
+changed from <code>string</code> to primitive types, or the order of dimensions can be changed for better locality.
+In this case, the dimensions of recent segments precede that of old segments in terms of data types and the ordering.
+This is because more recent segments are more likely to have the new desired order and data types. If you want to use
+your own ordering and types, you can specify a custom <code>dimensionsSpec</code> in the compaction task spec.</li>
+<li>Roll-up: the output segment is rolled up only when <code>rollup</code> is set for all input segments.
+See <a href="../ingestion/index.html#rollup">Roll-up</a> for more details.
+You can check that your segments are rolled up or not by using <a href="../querying/segmentmetadataquery.html#analysistypes">Segment Metadata Queries</a>.</li>
+</ul>
+<h3><a class="anchor" aria-hidden="true" id="compaction-ioconfig"></a><a href="#compaction-ioconfig" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Compaction IOConfig</h3>
+<p>The compaction IOConfig requires specifying <code>inputSpec</code> as seen below.</p>
+<table>
+<thead>
+<tr><th>Field</th><th>Description</th><th>Required</th></tr>
+</thead>
+<tbody>
+<tr><td><code>type</code></td><td>Task type. Should be <code>compact</code></td><td>Yes</td></tr>
+<tr><td><code>inputSpec</code></td><td>Input specification</td><td>Yes</td></tr>
+</tbody>
+</table>
+<p>There are two supported <code>inputSpec</code>s for now.</p>
+<p>The interval <code>inputSpec</code> is:</p>
+<table>
+<thead>
+<tr><th>Field</th><th>Description</th><th>Required</th></tr>
+</thead>
+<tbody>
+<tr><td><code>type</code></td><td>Task type. Should be <code>interval</code></td><td>Yes</td></tr>
+<tr><td><code>interval</code></td><td>Interval to compact</td><td>Yes</td></tr>
+</tbody>
+</table>
+<p>The segments <code>inputSpec</code> is:</p>
+<table>
+<thead>
+<tr><th>Field</th><th>Description</th><th>Required</th></tr>
+</thead>
+<tbody>
+<tr><td><code>type</code></td><td>Task type. Should be <code>segments</code></td><td>Yes</td></tr>
+<tr><td><code>segments</code></td><td>A list of segment IDs</td><td>Yes</td></tr>
+</tbody>
+</table>
+<h2><a class="anchor" aria-hidden="true" id="adding-new-data"></a><a href="#adding-new-data" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Adding new data</h2>
+<p>Druid can insert new data to an existing datasource by appending new segments to existing segment sets. It can also add new data by merging an existing set of segments with new data and overwriting the original set.</p>
+<p>Druid does not support single-record updates by primary key.</p>
+<p><a name="update"></a></p>
+<h2><a class="anchor" aria-hidden="true" id="updating-existing-data"></a><a href="#updating-existing-data" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Updating existing data</h2>
+<p>Once you ingest some data in a dataSource for an interval and create Apache Druid segments, you might want to make changes to
+the ingested data. There are several ways this can be done.</p>
+<h3><a class="anchor" aria-hidden="true" id="using-lookups"></a><a href="#using-lookups" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Using lookups</h3>
+<p>If you have a dimension where values need to be updated frequently, try first using <a href="/docs/0.20.0/querying/lookups.html">lookups</a>. A
+classic use case of lookups is when you have an ID dimension stored in a Druid segment, and want to map the ID dimension to a
+human-readable String value that may need to be updated periodically.</p>
+<h3><a class="anchor" aria-hidden="true" id="reingesting-data"></a><a href="#reingesting-data" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Reingesting data</h3>
+<p>If lookup-based techniques are not sufficient, you will need to reingest data into Druid for the time chunks that you
+want to update. This can be done using one of the <a href="/docs/0.20.0/ingestion/index.html#batch">batch ingestion methods</a> in overwrite mode (the
+default mode). It can also be done using <a href="/docs/0.20.0/ingestion/index.html#streaming">streaming ingestion</a>, provided you drop data for the
+relevant time chunks first.</p>
+<p>If you do the reingestion in batch mode, Druid's atomic update mechanism means that queries will flip seamlessly from
+the old data to the new data.</p>
+<p>We recommend keeping a copy of your raw data around in case you ever need to reingest it.</p>
+<h3><a class="anchor" aria-hidden="true" id="with-hadoop-based-ingestion"></a><a href="#with-hadoop-based-ingestion" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>With Hadoop-based ingestion</h3>
+<p>This section assumes the reader understands how to do batch ingestion using Hadoop. See
+<a href="/docs/0.20.0/ingestion/hadoop.html">Hadoop batch ingestion</a> for more information. Hadoop batch-ingestion can be used for reindexing and delta ingestion.</p>
+<p>Druid uses an <code>inputSpec</code> in the <code>ioConfig</code> to know where the data to be ingested is located and how to read it.
+For simple Hadoop batch ingestion, <code>static</code> or <code>granularity</code> spec types allow you to read data stored in deep storage.</p>
+<p>There are other types of <code>inputSpec</code> to enable reindexing and delta ingestion.</p>
+<h3><a class="anchor" aria-hidden="true" id="reindexing-with-native-batch-ingestion"></a><a href="#reindexing-with-native-batch-ingestion" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Reindexing with Native Batch Ingestion</h3>
+<p>This section assumes the reader understands how to do batch ingestion without Hadoop using <a href="/docs/0.20.0/ingestion/native-batch.html">native batch indexing</a>,
+which uses an <code>inputSource</code> to know where and how to read the input data. The <a href="/docs/0.20.0/ingestion/native-batch.html#druid-input-source"><code>DruidInputSource</code></a>
+can be used to read data from segments inside Druid. Note that IndexTask is to be used for prototyping purposes only as
+it has to do all processing inside a single process and can't scale. Please use Hadoop batch ingestion for production
+scenarios dealing with more than 1GB of data.</p>
+<p><a name="delete"></a></p>
+<h2><a class="anchor" aria-hidden="true" id="deleting-data"></a><a href="#deleting-data" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Deleting data</h2>
+<p>Druid supports permanent deletion of segments that are in an &quot;unused&quot; state (see the
+<a href="../design/architecture.html#segment-lifecycle">Segment lifecycle</a> section of the Architecture page).</p>
+<p>The Kill Task deletes unused segments within a specified interval from metadata storage and deep storage.</p>
+<p>For more information, please see <a href="../ingestion/tasks.html#kill">Kill Task</a>.</p>
+<p>Permanent deletion of a segment in Apache Druid has two steps:</p>
+<ol>
+<li>The segment must first be marked as &quot;unused&quot;. This occurs when a segment is dropped by retention rules, and when a user manually disables a segment through the Coordinator API.</li>
+<li>After segments have been marked as &quot;unused&quot;, a Kill Task will delete any &quot;unused&quot; segments from Druid's metadata store as well as deep storage.</li>
+</ol>
+<p>For documentation on retention rules, please see <a href="/docs/0.20.0/operations/rule-configuration.html">Data Retention</a>.</p>
+<p>For documentation on disabling segments using the Coordinator API, please see the
+<a href="../operations/api-reference.html#coordinator-datasources">Coordinator Datasources API</a> reference.</p>
+<p>A data deletion tutorial is available at <a href="/docs/0.20.0/tutorials/tutorial-delete-data.html">Tutorial: Deleting data</a></p>
+<h2><a class="anchor" aria-hidden="true" id="kill-task"></a><a href="#kill-task" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Kill Task</h2>
+<p>Kill tasks delete all information about a segment and removes it from deep storage. Segments to kill must be unused (used==0) in the Druid segment table. The available grammar is:</p>
+<pre><code class="hljs css language-json">{
+    <span class="hljs-attr">"type"</span>: <span class="hljs-string">"kill"</span>,
+    <span class="hljs-attr">"id"</span>: &lt;task_id&gt;,
+    <span class="hljs-attr">"dataSource"</span>: &lt;task_datasource&gt;,
+    <span class="hljs-attr">"interval"</span> : &lt;all_segments_in_this_interval_will_die!&gt;,
+    <span class="hljs-attr">"context"</span>: &lt;task context&gt;
+}
+</code></pre>
+<h2><a class="anchor" aria-hidden="true" id="retention"></a><a href="#retention" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Retention</h2>
+<p>Druid supports retention rules, which are used to define intervals of time where data should be preserved, and intervals where data should be discarded.</p>
+<p>Druid also supports separating Historical processes into tiers, and the retention rules can be configured to assign data for specific intervals to specific tiers.</p>
+<p>These features are useful for performance/cost management; a common use case is separating Historical processes into a &quot;hot&quot; tier and a &quot;cold&quot; tier.</p>
+<p>For more information, please see <a href="/docs/0.20.0/operations/rule-configuration.html">Load rules</a>.</p>
+</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/0.20.0/ingestion/schema-design.html"><span class="arrow-prev">← </span><span>Schema design tips</span></a><a class="docs-next button" href="/docs/0.20.0/development/extensions-core/kafka-ingestion.html"><span>Apache Kafka</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#schema-changes">Schema changes</a><ul class="toc-headings"><li><a href="#replacing-segments">Replacing segments</a></li><li><a href="#different-schemas-among-segments">Different schemas among segments</a></li></ul></li><li><a href="#compaction-and-reindexing">Compaction and reindexing</a><ul class="toc-headings"><li><a href="#compaction-ioconfig">Compaction IOConfig</a></li></ul></li><li><a href="#adding-new-data">Adding new data</a></li><li><a href="#updating-existing-data">Updating existing data</a><ul class="toc-headings"><li><a href="#using-lookups">Using lookups</a></li><li><a href="#reingesting-data">Reingesting data</a></li><li><a href="#with-hadoop-based-ingestion">With Hadoop-based ingestion</a></li><li><a href="#reindexing-with-native-batch-ingestion">Reindexing with Native Batch Ingestion</a></li></ul></li><li><a href="#deleting-data">Deleting data</a></li><li><a href="#kill-task">Kill Task</a></li><li><a href="#retention">Retention</a></li></ul></nav></div><footer class="nav-footer druid-footer" id="footer"><div class="container"><div class="text-center"><p><a href="/technology">Technology</a> · <a href="/use-cases">Use Cases</a> · <a href="/druid-powered">Powered by Druid</a> · <a href="/docs/0.20.0/latest">Docs</a> · <a href="/community/">Community</a> · <a href="/downloads.html">Download</a> · <a href="/faq">FAQ</a></p></div><div class="text-center"><a title="Join the user group" href="https://groups.google.com/forum/#!forum/druid-user" target="_blank"><span class="fa fa-comments"></span></a> · <a title="Follow Druid" href="https://twitter.com/druidio" target="_blank"><span class="fab fa-twitter"></span></a> · <a title="Download via Apache" href="https://www.apache.org/dyn/closer.cgi?path=/incubator/druid/{{ site.druid_versions[0].versions[0].version }}/apache-druid-{{ site.druid_versions[0].versions[0].version }}-bin.tar.gz" target="_blank"><span class="fas fa-feather"></span></a> · <a title="GitHub" href="https://github.com/apache/druid" target="_blank"><span class="fab fa-github"></span></a></div><div class="text-center license">Copyright © 2019 <a href="https://www.apache.org/" target="_blank">Apache Software Foundation</a>.<br/>Except where otherwise noted, licensed under <a rel="license" href="http://creativecommons.org/licenses/by-sa/4.0/">CC BY-SA 4.0</a>.<br/>Apache Druid, Druid, and the Druid logo are either registered trademarks or trademarks of The Apache Software Foundation in the United States and other countries.</div></div></footer></div><script type="text/javascript" src="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.js"></script><script>
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+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>Redirecting...</title>
+<link rel="canonical" href="data-management.html#delete">
+<meta http-equiv="refresh" content="0; url=data-management.html#delete">
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diff --git a/docs/0.20.0/ingestion/faq.html b/docs/0.20.0/ingestion/faq.html
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+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Ingestion troubleshooting FAQ · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/0.20.0/ingestion/faq.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.20.0" /><meta property="og:title" content="Ingestion troubleshooting FAQ · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
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+<h3><a class="anchor" aria-hidden="true" id="realtime-ingestion"></a><a href="#realtime-ingestion" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Realtime ingestion</h3>
+<p>The most common cause of this is because events being ingested are out of band of Druid's <code>windowPeriod</code>. Druid realtime ingestion
+only accepts events within a configurable windowPeriod of the current time. You can verify this is what is happening by looking at the logs of your real-time process for log lines containing <code>ingest/events/*</code>. These metrics will indicate the events ingested, rejected, etc.</p>
+<p>We recommend using batch ingestion methods for historical data in production.</p>
+<h3><a class="anchor" aria-hidden="true" id="batch-ingestion"></a><a href="#batch-ingestion" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Batch Ingestion</h3>
+<p>If you are trying to batch load historical data but no events are being loaded, make sure the interval of your ingestion spec actually encapsulates the interval of your data. Events outside this interval are dropped.</p>
+<h2><a class="anchor" aria-hidden="true" id="what-types-of-data-does-druid-support"></a><a href="#what-types-of-data-does-druid-support" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>What types of data does Druid support?</h2>
+<p>Druid can ingest JSON, CSV, TSV and other delimited data out of the box. Druid supports single dimension values, or multiple dimension values (an array of strings). Druid supports long, float, and double numeric columns.</p>
+<h2><a class="anchor" aria-hidden="true" id="not-all-of-my-events-were-ingested"></a><a href="#not-all-of-my-events-were-ingested" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Not all of my events were ingested</h2>
+<p>Druid will reject events outside of a window period. The best way to see if events are being rejected is to check the <a href="/docs/0.20.0/operations/metrics.html">Druid ingest metrics</a>.</p>
+<p>If the number of ingested events seem correct, make sure your query is correctly formed. If you included a <code>count</code> aggregator in your ingestion spec, you will need to query for the results of this aggregate with a <code>longSum</code> aggregator. Issuing a query with a count aggregator will count the number of Druid rows, which includes <a href="/docs/0.20.0/design/index.html">roll-up</a>.</p>
+<h2><a class="anchor" aria-hidden="true" id="where-do-my-druid-segments-end-up-after-ingestion"></a><a href="#where-do-my-druid-segments-end-up-after-ingestion" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Where do my Druid segments end up after ingestion?</h2>
+<p>Depending on what <code>druid.storage.type</code> is set to, Druid will upload segments to some <a href="/docs/0.20.0/dependencies/deep-storage.html">Deep Storage</a>. Local disk is used as the default deep storage.</p>
+<h2><a class="anchor" aria-hidden="true" id="my-stream-ingest-is-not-handing-segments-off"></a><a href="#my-stream-ingest-is-not-handing-segments-off" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>My stream ingest is not handing segments off</h2>
+<p>First, make sure there are no exceptions in the logs of the ingestion process. Also make sure that <code>druid.storage.type</code> is set to a deep storage that isn't <code>local</code> if you are running a distributed cluster.</p>
+<p>Other common reasons that hand-off fails are as follows:</p>
+<ol>
+<li><p>Druid is unable to write to the metadata storage. Make sure your configurations are correct.</p></li>
+<li><p>Historical processes are out of capacity and cannot download any more segments. You'll see exceptions in the Coordinator logs if this occurs and the Coordinator console will show the Historicals are near capacity.</p></li>
+<li><p>Segments are corrupt and cannot be downloaded. You'll see exceptions in your Historical processes if this occurs.</p></li>
+<li><p>Deep storage is improperly configured. Make sure that your segment actually exists in deep storage and that the Coordinator logs have no errors.</p></li>
+</ol>
+<h2><a class="anchor" aria-hidden="true" id="how-do-i-get-hdfs-to-work"></a><a href="#how-do-i-get-hdfs-to-work" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>How do I get HDFS to work?</h2>
+<p>Make sure to include the <code>druid-hdfs-storage</code> and all the hadoop configuration, dependencies (that can be obtained by running command <code>hadoop classpath</code> on a machine where hadoop has been setup) in the classpath. And, provide necessary HDFS settings as described in <a href="/docs/0.20.0/dependencies/deep-storage.html">deep storage</a> .</p>
+<h2><a class="anchor" aria-hidden="true" id="how-do-i-know-when-i-can-make-query-to-druid-after-submitting-batch-ingestion-task"></a><a href="#how-do-i-know-when-i-can-make-query-to-druid-after-submitting-batch-ingestion-task" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>How do I know when I can make query to Druid after submitting batch ingestion task?</h2>
+<p>You can verify if segments created by a recent ingestion task are loaded onto historicals and available for querying using the following workflow.</p>
+<ol>
+<li>Submit your ingestion task.</li>
+<li>Repeatedly poll the <a href="/docs/0.20.0/operations/api-reference.html#tasks">Overlord's tasks API</a> ( <code>/druid/indexer/v1/task/{taskId}/status</code>) until your task is shown to be successfully completed.</li>
+<li>Poll the <a href="/docs/0.20.0/operations/api-reference.html#segment-loading-by-datasource">Segment Loading by Datasource API</a> (<code>/druid/coordinator/v1/datasources/{dataSourceName}/loadstatus</code>) with
+<code>forceMetadataRefresh=true</code> and <code>interval=&lt;INTERVAL_OF_INGESTED_DATA&gt;</code> once.
+(Note: <code>forceMetadataRefresh=true</code> refreshes Coordinator's metadata cache of all datasources. This can be a heavy operation in terms of the load on the metadata store but is necessary to make sure that we verify all the latest segments' load status)
+If there are segments not yet loaded, continue to step 4, otherwise you can now query the data.</li>
+<li>Repeatedly poll the <a href="/docs/0.20.0/operations/api-reference.html#segment-loading-by-datasource">Segment Loading by Datasource API</a> (<code>/druid/coordinator/v1/datasources/{dataSourceName}/loadstatus</code>) with
+<code>forceMetadataRefresh=false</code> and <code>interval=&lt;INTERVAL_OF_INGESTED_DATA&gt;</code>.
+Continue polling until all segments are loaded. Once all segments are loaded you can now query the data.
+Note that this workflow only guarantees that the segments are available at the time of the <a href="/docs/0.20.0/operations/api-reference.html#segment-loading-by-datasource">Segment Loading by Datasource API</a> call. Segments can still become missing because of historical process failures or any other reasons afterward.</li>
+</ol>
+<h2><a class="anchor" aria-hidden="true" id="i-dont-see-my-druid-segments-on-my-historical-processes"></a><a href="#i-dont-see-my-druid-segments-on-my-historical-processes" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>I don't see my Druid segments on my Historical processes</h2>
+<p>You can check the Coordinator console located at <code>&lt;COORDINATOR_IP&gt;:&lt;PORT&gt;</code>. Make sure that your segments have actually loaded on <a href="/docs/0.20.0/design/historical.html">Historical processes</a>. If your segments are not present, check the Coordinator logs for messages about capacity of replication errors. One reason that segments are not downloaded is because Historical processes have maxSizes that are too small, making them incapable of downloading more data. You can change that with (for example):</p>
+<pre><code class="hljs"><span class="hljs-attr">-Ddruid.segmentCache.locations</span>=[{<span class="hljs-string">"path"</span>:<span class="hljs-string">"/tmp/druid/storageLocation"</span>,<span class="hljs-string">"maxSize"</span>:<span class="hljs-string">"500000000000"</span>}]
+</code></pre>
+<h2><a class="anchor" aria-hidden="true" id="my-queries-are-returning-empty-results"></a><a href="#my-queries-are-returning-empty-results" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>My queries are returning empty results</h2>
+<p>You can use a <a href="/docs/0.20.0/querying/segmentmetadataquery.html">segment metadata query</a> for the dimensions and metrics that have been created for your datasource. Make sure that the name of the aggregators you use in your query match one of these metrics. Also make sure that the query interval you specify match a valid time range where data exists.</p>
+<h2><a class="anchor" aria-hidden="true" id="how-can-i-reindex-existing-data-in-druid-with-schema-changes"></a><a href="#how-can-i-reindex-existing-data-in-druid-with-schema-changes" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>How can I Reindex existing data in Druid with schema changes?</h2>
+<p>You can use DruidInputSource with the <a href="/docs/0.20.0/ingestion/native-batch.html">Parallel task</a> to ingest existing druid segments using a new schema and change the name, dimensions, metrics, rollup, etc. of the segment.
+See <a href="/docs/0.20.0/ingestion/native-batch.html#druid-input-source">DruidInputSource</a> for more details.
+Or, if you use hadoop based ingestion, then you can use &quot;dataSource&quot; input spec to do reindexing.</p>
+<p>See the <a href="/docs/0.20.0/ingestion/data-management.html#update">Update existing data</a> section of the data management page for more details.</p>
+<h2><a class="anchor" aria-hidden="true" id="how-can-i-change-the-granularity-of-existing-data-in-druid"></a><a href="#how-can-i-change-the-granularity-of-existing-data-in-druid" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>How can I change the granularity of existing data in Druid?</h2>
+<p>In a lot of situations you may want to lower the granularity of older data. Example, any data older than 1 month has only hour level granularity but newer data has minute level granularity. This use case is same as re-indexing.</p>
+<p>To do this use the <a href="/docs/0.20.0/ingestion/native-batch.html#druid-input-source">DruidInputSource</a> and run a <a href="/docs/0.20.0/ingestion/native-batch.html">Parallel task</a>. The DruidInputSource will allow you to take in existing segments from Druid and aggregate them and feed them back into Druid. It will also allow you to filter the data in those segments while feeding it back in. This means if there are rows you want to delete, you can just filter them away during re-ingestion.
+Typically the above will be run as a batch job to say everyday feed in a chunk of data and aggregate it.
+Or, if you use hadoop based ingestion, then you can use &quot;dataSource&quot; input spec to do reindexing.</p>
+<p>See the <a href="/docs/0.20.0/ingestion/data-management.html#update">Update existing data</a> section of the data management page for more details.</p>
+<h2><a class="anchor" aria-hidden="true" id="real-time-ingestion-seems-to-be-stuck"></a><a href="#real-time-ingestion-seems-to-be-stuck" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Real-time ingestion seems to be stuck</h2>
+<p>There are a few ways this can occur. Druid will throttle ingestion to prevent out of memory problems if the intermediate persists are taking too long or if hand-off is taking too long. If your process logs indicate certain columns are taking a very long time to build (for example, if your segment granularity is hourly, but creating a single column takes 30 minutes), you should re-evaluate your configuration or scale up your real-time ingestion.</p>
+<h2><a class="anchor" aria-hidden="true" id="more-information"></a><a href="#more-information" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>More information</h2>
+<p>Getting data into Druid can definitely be difficult for first time users. Please don't hesitate to ask questions in our IRC channel or on our <a href="https://groups.google.com/forum/#!forum/druid-user">google groups page</a>.</p>
+</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/0.20.0/ingestion/tasks.html"><span class="arrow-prev">← </span><span>Task reference</span></a><a class="docs-next button" href="/docs/0.20.0/querying/sql.html"><span>Druid SQL</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#what-types-of-data-does-druid-support">What types of data does Druid support?</a></li><li><a href="#not-all-of-my-events-were-ingested">Not all of my events were ingested</a></li><li><a href="#where-do-my-druid-segments-end-up-after-ingestion">Where do my Druid segments end up after ingestion?</a></li><li><a href="#my-stream-ingest-is-not-handing-segments-off">My stream ingest is not handing segments off</a></li><li><a href="#how-do-i-get-hdfs-to-work">How do I get HDFS to work?</a></li><li><a href="#how-do-i-know-when-i-can-make-query-to-druid-after-submitting-batch-ingestion-task">How do I know when I can make query to Druid after submitting batch ingestion task?</a></li><li><a href="#i-dont-see-my-druid-segments-on-my-historical-processes">I don't see my Druid segments on my Historical processes</a></li><li><a href="#my-queries-are-returning-empty-results">My queries are returning empty results</a></li><li><a href="#how-can-i-reindex-existing-data-in-druid-with-schema-changes">How can I Reindex existing data in Druid with schema changes?</a></li><li><a href="#how-can-i-change-the-granularity-of-existing-data-in-druid">How can I change the granularity of existing data in Druid?</a></li><li><a href="#real-time-ingestion-seems-to-be-stuck">Real-time ingestion seems to be stuck</a></li><li><a href="#more-information">More information</a></li></ul></nav></div><footer class="nav-footer druid-footer" id="footer"><div class="container"><div class="text-center"><p><a href="/technology">Technology</a> · <a href="/use-cases">Use Cases</a> · <a href="/druid-powered">Powered by Druid</a> · <a href="/docs/0.20.0/latest">Docs</a> · <a href="/community/">Community</a> · <a href="/downloads.html">Download</a> · <a href="/faq">FAQ</a></p></div><div class="text-center"><a title="Join the user group" href="https://groups.google.com/forum/#!forum/druid-user" target="_blank"><span class="fa fa-comments"></span></a> · <a title="Follow Druid" href="https://twitter.com/druidio" target="_blank"><span class="fab fa-twitter"></span></a> · <a title="Download via Apache" href="https://www.apache.org/dyn/closer.cgi?path=/incubator/druid/{{ site.druid_versions[0].versions[0].version }}/apache-druid-{{ site.druid_versions[0].versions[0].version }}-bin.tar.gz" target="_blank"><span class="fas fa-feather"></span></a> · <a title="GitHub" href="https://github.com/apache/druid" target="_blank"><span class="fab fa-github"></span></a></div><div class="text-center license">Copyright © 2019 <a href="https://www.apache.org/" target="_blank">Apache Software Foundation</a>.<br/>Except where otherwise noted, licensed under <a rel="license" href="http://creativecommons.org/licenses/by-sa/4.0/">CC BY-SA 4.0</a>.<br/>Apache Druid, Druid, and the Druid logo are either registered trademarks or trademarks of The Apache Software Foundation in the United States and other countries.</div></div></footer></div><script type="text/javascript" src="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.js"></script><script>
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+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Hadoop-based ingestion · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/0.20.0/ingestion/hadoop.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.20.0" /><meta property="og:title" content="Hadoop-based ingestion · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
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class="icon-toc"></i></div></div><div class="navGroups"><div class="navGroup"><h3 class="navGroupCategoryTitle collapsible">Getting started<span class="arrow"><svg width="24" height="24" viewBox="0 0 24 24"><path fill="#565656" d="M7.41 15.41L12 10.83l4.59 4.58L18 14l-6-6-6 6z"></path><path d="M0 0h24v24H0z" fill="none"></path></svg></span></h3><ul class="hide"><li class="navListItem"><a class="navItem" href="/docs/0.20.0/design/index.html">Introduction to Apache Druid</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/tutorials/index.html">Quickstart</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/tutorials/docker.html">Docker</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/operations/single-server.html">Single server deployment</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/tutorials/cluster.html">Clustered deployment</a></li></ul></div><div class="navGroup"><h3 class="navGroupCategoryTitle collapsible">Tutorials<span class="arrow"><svg width="24" height="24" viewBox="0 0 24 24"><path fill="#565656" d="M7.41 15.41L12 10.83l4.59 4.58L18 14l-6-6-6 6z"></path><path d="M0 0h24v24H0z" fill="none"></path></svg></span></h3><ul class="hide"><li class="navListItem"><a class="navItem" href="/docs/0.20.0/tutorials/tutorial-batch.html">Loading files natively</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/tutorials/tutorial-kafka.html">Load from Apache Kafka</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/tutorials/tutorial-batch-hadoop.html">Load from Apache Hadoop</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/tutorials/tutorial-query.html">Querying data</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/tutorials/tutorial-rollup.html">Roll-up</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/tutorials/tutorial-retention.html">Configuring data retention</a></li><li 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+                if (!toggler) {
+                  return;
+                }
+
+                toggler.onclick = function(event) {
+                  event.preventDefault();
+
+                  target.classList.toggle(className);
+                };
+              }
+            });
+        </script></nav></div><div class="container mainContainer docsContainer"><div class="wrapper"><div class="post"><header class="postHeader"><a class="edit-page-link button" href="https://github.com/apache/druid/edit/master/docs/ingestion/hadoop.md" target="_blank" rel="noreferrer noopener">Edit</a><h1 id="__docusaurus" class="postHeaderTitle">Hadoop-based ingestion</h1></header><article><div><span><!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
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+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+  -->
+<p>Apache Hadoop-based batch ingestion in Apache Druid is supported via a Hadoop-ingestion task. These tasks can be posted to a running
+instance of a Druid <a href="/docs/0.20.0/design/overlord.html">Overlord</a>. Please refer to our <a href="/docs/0.20.0/ingestion/index.html#batch">Hadoop-based vs. native batch comparison table</a> for
+comparisons between Hadoop-based, native batch (simple), and native batch (parallel) ingestion.</p>
+<p>To run a Hadoop-based ingestion task, write an ingestion spec as specified below. Then POST it to the
+<a href="../operations/api-reference.html#tasks"><code>/druid/indexer/v1/task</code></a> endpoint on the Overlord, or use the
+<code>bin/post-index-task</code> script included with Druid.</p>
+<h2><a class="anchor" aria-hidden="true" id="tutorial"></a><a href="#tutorial" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Tutorial</h2>
+<p>This page contains reference documentation for Hadoop-based ingestion.
+For a walk-through instead, check out the <a href="/docs/0.20.0/tutorials/tutorial-batch-hadoop.html">Loading from Apache Hadoop</a> tutorial.</p>
+<h2><a class="anchor" aria-hidden="true" id="task-syntax"></a><a href="#task-syntax" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Task syntax</h2>
+<p>A sample task is shown below:</p>
+<pre><code class="hljs css language-json">{
+  <span class="hljs-attr">"type"</span> : <span class="hljs-string">"index_hadoop"</span>,
+  <span class="hljs-attr">"spec"</span> : {
+    <span class="hljs-attr">"dataSchema"</span> : {
+      <span class="hljs-attr">"dataSource"</span> : <span class="hljs-string">"wikipedia"</span>,
+      <span class="hljs-attr">"parser"</span> : {
+        <span class="hljs-attr">"type"</span> : <span class="hljs-string">"hadoopyString"</span>,
+        <span class="hljs-attr">"parseSpec"</span> : {
+          <span class="hljs-attr">"format"</span> : <span class="hljs-string">"json"</span>,
+          <span class="hljs-attr">"timestampSpec"</span> : {
+            <span class="hljs-attr">"column"</span> : <span class="hljs-string">"timestamp"</span>,
+            <span class="hljs-attr">"format"</span> : <span class="hljs-string">"auto"</span>
+          },
+          <span class="hljs-attr">"dimensionsSpec"</span> : {
+            <span class="hljs-attr">"dimensions"</span>: [<span class="hljs-string">"page"</span>,<span class="hljs-string">"language"</span>,<span class="hljs-string">"user"</span>,<span class="hljs-string">"unpatrolled"</span>,<span class="hljs-string">"newPage"</span>,<span class="hljs-string">"robot"</span>,<span class="hljs-string">"anonymous"</span>,<span class="hljs-string">"namespace"</span>,<span class="hljs-string">"continent"</span>,<span class="hljs-string">"country"</span>,<span class="hljs-string">"region"</span>,<span class="hljs-string">"city"</span>],
+            <span class="hljs-attr">"dimensionExclusions"</span> : [],
+            <span class="hljs-attr">"spatialDimensions"</span> : []
+          }
+        }
+      },
+      <span class="hljs-attr">"metricsSpec"</span> : [
+        {
+          <span class="hljs-attr">"type"</span> : <span class="hljs-string">"count"</span>,
+          <span class="hljs-attr">"name"</span> : <span class="hljs-string">"count"</span>
+        },
+        {
+          <span class="hljs-attr">"type"</span> : <span class="hljs-string">"doubleSum"</span>,
+          <span class="hljs-attr">"name"</span> : <span class="hljs-string">"added"</span>,
+          <span class="hljs-attr">"fieldName"</span> : <span class="hljs-string">"added"</span>
+        },
+        {
+          <span class="hljs-attr">"type"</span> : <span class="hljs-string">"doubleSum"</span>,
+          <span class="hljs-attr">"name"</span> : <span class="hljs-string">"deleted"</span>,
+          <span class="hljs-attr">"fieldName"</span> : <span class="hljs-string">"deleted"</span>
+        },
+        {
+          <span class="hljs-attr">"type"</span> : <span class="hljs-string">"doubleSum"</span>,
+          <span class="hljs-attr">"name"</span> : <span class="hljs-string">"delta"</span>,
+          <span class="hljs-attr">"fieldName"</span> : <span class="hljs-string">"delta"</span>
+        }
+      ],
+      <span class="hljs-attr">"granularitySpec"</span> : {
+        <span class="hljs-attr">"type"</span> : <span class="hljs-string">"uniform"</span>,
+        <span class="hljs-attr">"segmentGranularity"</span> : <span class="hljs-string">"DAY"</span>,
+        <span class="hljs-attr">"queryGranularity"</span> : <span class="hljs-string">"NONE"</span>,
+        <span class="hljs-attr">"intervals"</span> : [ <span class="hljs-string">"2013-08-31/2013-09-01"</span> ]
+      }
+    },
+    <span class="hljs-attr">"ioConfig"</span> : {
+      <span class="hljs-attr">"type"</span> : <span class="hljs-string">"hadoop"</span>,
+      <span class="hljs-attr">"inputSpec"</span> : {
+        <span class="hljs-attr">"type"</span> : <span class="hljs-string">"static"</span>,
+        <span class="hljs-attr">"paths"</span> : <span class="hljs-string">"/MyDirectory/example/wikipedia_data.json"</span>
+      }
+    },
+    <span class="hljs-attr">"tuningConfig"</span> : {
+      <span class="hljs-attr">"type"</span>: <span class="hljs-string">"hadoop"</span>
+    }
+  },
+  <span class="hljs-attr">"hadoopDependencyCoordinates"</span>: &lt;my_hadoop_version&gt;
+}
+</code></pre>
+<table>
+<thead>
+<tr><th>property</th><th>description</th><th>required?</th></tr>
+</thead>
+<tbody>
+<tr><td>type</td><td>The task type, this should always be &quot;index_hadoop&quot;.</td><td>yes</td></tr>
+<tr><td>spec</td><td>A Hadoop Index Spec. See <a href="/docs/0.20.0/ingestion/index.html">Ingestion</a></td><td>yes</td></tr>
+<tr><td>hadoopDependencyCoordinates</td><td>A JSON array of Hadoop dependency coordinates that Druid will use, this property will override the default Hadoop coordinates. Once specified, Druid will look for those Hadoop dependencies from the location specified by <code>druid.extensions.hadoopDependenciesDir</code></td><td>no</td></tr>
+<tr><td>classpathPrefix</td><td>Classpath that will be prepended for the Peon process.</td><td>no</td></tr>
+</tbody>
+</table>
+<p>Also note that Druid automatically computes the classpath for Hadoop job containers that run in the Hadoop cluster. But in case of conflicts between Hadoop and Druid's dependencies, you can manually specify the classpath by setting <code>druid.extensions.hadoopContainerDruidClasspath</code> property. See the extensions config in <a href="../configuration/index.html#extensions">base druid configuration</a>.</p>
+<h2><a class="anchor" aria-hidden="true" id="dataschema"></a><a href="#dataschema" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a><code>dataSchema</code></h2>
+<p>This field is required. See the <a href="/docs/0.20.0/ingestion/index.html#legacy-dataschema-spec"><code>dataSchema</code></a> section of the main ingestion page for details on
+what it should contain.</p>
+<h2><a class="anchor" aria-hidden="true" id="ioconfig"></a><a href="#ioconfig" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a><code>ioConfig</code></h2>
+<p>This field is required.</p>
+<table>
+<thead>
+<tr><th>Field</th><th>Type</th><th>Description</th><th>Required</th></tr>
+</thead>
+<tbody>
+<tr><td>type</td><td>String</td><td>This should always be 'hadoop'.</td><td>yes</td></tr>
+<tr><td>inputSpec</td><td>Object</td><td>A specification of where to pull the data in from. See below.</td><td>yes</td></tr>
+<tr><td>segmentOutputPath</td><td>String</td><td>The path to dump segments into.</td><td>Only used by the <a href="#cli">Command-line Hadoop indexer</a>. This field must be null otherwise.</td></tr>
+<tr><td>metadataUpdateSpec</td><td>Object</td><td>A specification of how to update the metadata for the druid cluster these segments belong to.</td><td>Only used by the <a href="#cli">Command-line Hadoop indexer</a>. This field must be null otherwise.</td></tr>
+</tbody>
+</table>
+<h3><a class="anchor" aria-hidden="true" id="inputspec"></a><a href="#inputspec" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a><code>inputSpec</code></h3>
+<p>There are multiple types of inputSpecs:</p>
+<h4><a class="anchor" aria-hidden="true" id="static"></a><a href="#static" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a><code>static</code></h4>
+<p>A type of inputSpec where a static path to the data files is provided.</p>
+<table>
+<thead>
+<tr><th>Field</th><th>Type</th><th>Description</th><th>Required</th></tr>
+</thead>
+<tbody>
+<tr><td>inputFormat</td><td>String</td><td>Specifies the Hadoop InputFormat class to use. e.g. <code>org.apache.hadoop.mapreduce.lib.input.SequenceFileInputFormat</code></td><td>no</td></tr>
+<tr><td>paths</td><td>Array of String</td><td>A String of input paths indicating where the raw data is located.</td><td>yes</td></tr>
+</tbody>
+</table>
+<p>For example, using the static input paths:</p>
+<pre><code class="hljs"><span class="hljs-string">"paths"</span> : "<span class="hljs-type">hdfs</span>://path/to/data/<span class="hljs-keyword">is</span>/here/data.gz,hdfs://path/to/data/<span class="hljs-keyword">is</span>/here/moredata.gz,hdfs://path/to/data/<span class="hljs-keyword">is</span>/here/evenmoredata.gz<span class="hljs-string">"
+</span></code></pre>
+<p>You can also read from cloud storage such as AWS S3 or Google Cloud Storage.
+To do so, you need to install the necessary library under Druid's classpath in <em>all MiddleManager or Indexer processes</em>.
+For S3, you can run the below command to install the <a href="https://hadoop.apache.org/docs/current/hadoop-aws/tools/hadoop-aws/index.html">Hadoop AWS module</a>.</p>
+<pre><code class="hljs css language-bash">java -classpath <span class="hljs-string">"<span class="hljs-variable">${DRUID_HOME}</span>lib/*"</span> org.apache.druid.cli.Main tools pull-deps -h <span class="hljs-string">"org.apache.hadoop:hadoop-aws:<span class="hljs-variable">${HADOOP_VERSION}</span>"</span>;
+cp <span class="hljs-variable">${DRUID_HOME}</span>/hadoop-dependencies/hadoop-aws/<span class="hljs-variable">${HADOOP_VERSION}</span>/hadoop-aws-<span class="hljs-variable">${HADOOP_VERSION}</span>.jar <span class="hljs-variable">${DRUID_HOME}</span>/extensions/druid-hdfs-storage/
+</code></pre>
+<p>Once you install the Hadoop AWS module in all MiddleManager and Indexer processes, you can put
+your S3 paths in the inputSpec with the below job properties.
+For more configurations, see the <a href="https://hadoop.apache.org/docs/current/hadoop-aws/tools/hadoop-aws/index.html">Hadoop AWS module</a>.</p>
+<pre><code class="hljs"><span class="hljs-string">"paths"</span> : "<span class="hljs-type">s3a</span>://billy-bucket/the/data/<span class="hljs-keyword">is</span>/here/data.gz,s3a://billy-bucket/the/data/<span class="hljs-keyword">is</span>/here/moredata.gz,s3a://billy-bucket/the/data/<span class="hljs-keyword">is</span>/here/evenmoredata.gz<span class="hljs-string">"
+</span></code></pre>
+<pre><code class="hljs css language-json">"jobProperties" : {
+  "fs.s3a.impl" : "org.apache.hadoop.fs.s3a.S3AFileSystem",
+  "fs.AbstractFileSystem.s3a.impl" : "org.apache.hadoop.fs.s3a.S3A",
+  "fs.s3a.access.key" : "YOUR_ACCESS_KEY",
+  "fs.s3a.secret.key" : "YOUR_SECRET_KEY"
+}
+</code></pre>
+<p>For Google Cloud Storage, you need to install <a href="https://github.com/GoogleCloudPlatform/bigdata-interop/blob/master/gcs/INSTALL.md">GCS connector jar</a>
+under <code>${DRUID_HOME}/hadoop-dependencies</code> in <em>all MiddleManager or Indexer processes</em>.
+Once you install the GCS Connector jar in all MiddleManager and Indexer processes, you can put
+your Google Cloud Storage paths in the inputSpec with the below job properties.
+For more configurations, see the <a href="https://github.com/GoogleCloudPlatform/bigdata-interop/blob/master/gcs/INSTALL.md#configure-hadoop">instructions to configure Hadoop</a>,
+<a href="https://github.com/GoogleCloudPlatform/bigdata-interop/blob/master/gcs/conf/gcs-core-default.xml">GCS core default</a>
+and <a href="https://github.com/GoogleCloudPlatform/bdutil/blob/master/conf/hadoop2/gcs-core-template.xml">GCS core template</a>.</p>
+<pre><code class="hljs"><span class="hljs-string">"paths"</span> : "<span class="hljs-type">gs</span>://billy-bucket/the/data/<span class="hljs-keyword">is</span>/here/data.gz,gs://billy-bucket/the/data/<span class="hljs-keyword">is</span>/here/moredata.gz,gs://billy-bucket/the/data/<span class="hljs-keyword">is</span>/here/evenmoredata.gz<span class="hljs-string">"
+</span></code></pre>
+<pre><code class="hljs css language-json">"jobProperties" : {
+  "fs.gs.impl" : "com.google.cloud.hadoop.fs.gcs.GoogleHadoopFileSystem",
+  "fs.AbstractFileSystem.gs.impl" : "com.google.cloud.hadoop.fs.gcs.GoogleHadoopFS"
+}
+</code></pre>
+<h4><a class="anchor" aria-hidden="true" id="granularity"></a><a href="#granularity" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a><code>granularity</code></h4>
+<p>A type of inputSpec that expects data to be organized in directories according to datetime using the path format: <code>y=XXXX/m=XX/d=XX/H=XX/M=XX/S=XX</code> (where date is represented by lowercase and time is represented by uppercase).</p>
+<table>
+<thead>
+<tr><th>Field</th><th>Type</th><th>Description</th><th>Required</th></tr>
+</thead>
+<tbody>
+<tr><td>dataGranularity</td><td>String</td><td>Specifies the granularity to expect the data at, e.g. hour means to expect directories <code>y=XXXX/m=XX/d=XX/H=XX</code>.</td><td>yes</td></tr>
+<tr><td>inputFormat</td><td>String</td><td>Specifies the Hadoop InputFormat class to use. e.g. <code>org.apache.hadoop.mapreduce.lib.input.SequenceFileInputFormat</code></td><td>no</td></tr>
+<tr><td>inputPath</td><td>String</td><td>Base path to append the datetime path to.</td><td>yes</td></tr>
+<tr><td>filePattern</td><td>String</td><td>Pattern that files should match to be included.</td><td>yes</td></tr>
+<tr><td>pathFormat</td><td>String</td><td>Joda datetime format for each directory. Default value is <code>&quot;'y'=yyyy/'m'=MM/'d'=dd/'H'=HH&quot;</code>, or see <a href="http://www.joda.org/joda-time/apidocs/org/joda/time/format/DateTimeFormat.html">Joda documentation</a></td><td>no</td></tr>
+</tbody>
+</table>
+<p>For example, if the sample config were run with the interval 2012-06-01/2012-06-02, it would expect data at the paths:</p>
+<pre><code class="hljs">s3n:<span class="hljs-regexp">//</span>billy-bucket<span class="hljs-regexp">/the/</span>data<span class="hljs-regexp">/is/</span>here<span class="hljs-regexp">/y=2012/m</span>=<span class="hljs-number">06</span><span class="hljs-regexp">/d=01/</span>H=<span class="hljs-number">00</span>
+s3n:<span class="hljs-regexp">//</span>billy-bucket<span class="hljs-regexp">/the/</span>data<span class="hljs-regexp">/is/</span>here<span class="hljs-regexp">/y=2012/m</span>=<span class="hljs-number">06</span><span class="hljs-regexp">/d=01/</span>H=<span class="hljs-number">01</span>
+...
+s3n:<span class="hljs-regexp">//</span>billy-bucket<span class="hljs-regexp">/the/</span>data<span class="hljs-regexp">/is/</span>here<span class="hljs-regexp">/y=2012/m</span>=<span class="hljs-number">06</span><span class="hljs-regexp">/d=01/</span>H=<span class="hljs-number">23</span>
+</code></pre>
+<h4><a class="anchor" aria-hidden="true" id="datasource"></a><a href="#datasource" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a><code>dataSource</code></h4>
+<p>This is a type of <code>inputSpec</code> that reads data already stored inside Druid. This is used to allow &quot;re-indexing&quot; data and for &quot;delta-ingestion&quot; described later in <code>multi</code> type inputSpec.</p>
+<table>
+<thead>
+<tr><th>Field</th><th>Type</th><th>Description</th><th>Required</th></tr>
+</thead>
+<tbody>
+<tr><td>type</td><td>String.</td><td>This should always be 'dataSource'.</td><td>yes</td></tr>
+<tr><td>ingestionSpec</td><td>JSON object.</td><td>Specification of Druid segments to be loaded. See below.</td><td>yes</td></tr>
+<tr><td>maxSplitSize</td><td>Number</td><td>Enables combining multiple segments into single Hadoop InputSplit according to size of segments. With -1, druid calculates max split size based on user specified number of map task(mapred.map.tasks or mapreduce.job.maps). By default, one split is made for one segment. maxSplitSize is specified in bytes.</td><td>no</td></tr>
+<tr><td>useNewAggs</td><td>Boolean</td><td>If &quot;false&quot;, then list of aggregators in &quot;metricsSpec&quot; of hadoop indexing task must be same as that used in original indexing task while ingesting raw data. Default value is &quot;false&quot;. This field can be set to &quot;true&quot; when &quot;inputSpec&quot; type is &quot;dataSource&quot; and not &quot;multi&quot; to enable arbitrary aggregators while reindexing. See below for &quot;multi&quot; type support for delta-ingestion.</td><td>no</td></tr>
+</tbody>
+</table>
+<p>Here is what goes inside <code>ingestionSpec</code>:</p>
+<table>
+<thead>
+<tr><th>Field</th><th>Type</th><th>Description</th><th>Required</th></tr>
+</thead>
+<tbody>
+<tr><td>dataSource</td><td>String</td><td>Druid dataSource name from which you are loading the data.</td><td>yes</td></tr>
+<tr><td>intervals</td><td>List</td><td>A list of strings representing ISO-8601 Intervals.</td><td>yes</td></tr>
+<tr><td>segments</td><td>List</td><td>List of segments from which to read data from, by default it is obtained automatically. You can obtain list of segments to put here by making a POST query to Coordinator at url /druid/coordinator/v1/metadata/datasources/segments?full with list of intervals specified in the request payload, e.g. [&quot;2012-01-01T00:00:00.000/2012-01-03T00:00:00.000&quot;, &quot;2012-01-05T00:00:00.000/2012-01-07T00:00:00.000&quot;]. You may want to provide this list manually in order to ensure that segments read are exactly same as they were at the time of task submission, task would fail if the list provided by the user does not match with state of database when the task actually runs.</td><td>no</td></tr>
+<tr><td>filter</td><td>JSON</td><td>See <a href="/docs/0.20.0/querying/filters.html">Filters</a></td><td>no</td></tr>
+<tr><td>dimensions</td><td>Array of String</td><td>Name of dimension columns to load. By default, the list will be constructed from parseSpec. If parseSpec does not have an explicit list of dimensions then all the dimension columns present in stored data will be read.</td><td>no</td></tr>
+<tr><td>metrics</td><td>Array of String</td><td>Name of metric columns to load. By default, the list will be constructed from the &quot;name&quot; of all the configured aggregators.</td><td>no</td></tr>
+<tr><td>ignoreWhenNoSegments</td><td>boolean</td><td>Whether to ignore this ingestionSpec if no segments were found. Default behavior is to throw error when no segments were found.</td><td>no</td></tr>
+</tbody>
+</table>
+<p>For example</p>
+<pre><code class="hljs css language-json">"ioConfig" : {
+  "type" : "hadoop",
+  "inputSpec" : {
+    "type" : "dataSource",
+    "ingestionSpec" : {
+      "dataSource": "wikipedia",
+      "intervals": ["2014-10-20T00:00:00Z/P2W"]
+    }
+  },
+  ...
+}
+</code></pre>
+<h4><a class="anchor" aria-hidden="true" id="multi"></a><a href="#multi" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a><code>multi</code></h4>
+<p>This is a composing inputSpec to combine other inputSpecs. This inputSpec is used for delta ingestion. You can also use a <code>multi</code> inputSpec to combine data from multiple dataSources. However, each particular dataSource can only be specified one time.
+Note that, &quot;useNewAggs&quot; must be set to default value false to support delta-ingestion.</p>
+<table>
+<thead>
+<tr><th>Field</th><th>Type</th><th>Description</th><th>Required</th></tr>
+</thead>
+<tbody>
+<tr><td>children</td><td>Array of JSON objects</td><td>List of JSON objects containing other inputSpecs.</td><td>yes</td></tr>
+</tbody>
+</table>
+<p>For example:</p>
+<pre><code class="hljs css language-json">"ioConfig" : {
+  "type" : "hadoop",
+  "inputSpec" : {
+    "type" : "multi",
+    "children": [
+      {
+        "type" : "dataSource",
+        "ingestionSpec" : {
+          "dataSource": "wikipedia",
+          "intervals": ["2012-01-01T00:00:00.000/2012-01-03T00:00:00.000", "2012-01-05T00:00:00.000/2012-01-07T00:00:00.000"],
+          "segments": [
+            {
+              "dataSource": "test1",
+              "interval": "2012-01-01T00:00:00.000/2012-01-03T00:00:00.000",
+              "version": "v2",
+              "loadSpec": {
+                "type": "local",
+                "path": "/tmp/index1.zip"
+              },
+              "dimensions": "host",
+              "metrics": "visited_sum,unique_hosts",
+              "shardSpec": {
+                "type": "none"
+              },
+              "binaryVersion": 9,
+              "size": 2,
+              "identifier": "test1_2000-01-01T00:00:00.000Z_3000-01-01T00:00:00.000Z_v2"
+            }
+          ]
+        }
+      },
+      {
+        "type" : "static",
+        "paths": "/path/to/more/wikipedia/data/"
+      }
+    ]
+  },
+  ...
+}
+</code></pre>
+<p>It is STRONGLY RECOMMENDED to provide list of segments in <code>dataSource</code> inputSpec explicitly so that your delta ingestion task is idempotent. You can obtain that list of segments by making following call to the Coordinator.
+POST <code>/druid/coordinator/v1/metadata/datasources/{dataSourceName}/segments?full</code>
+Request Body: [interval1, interval2,...] for example [&quot;2012-01-01T00:00:00.000/2012-01-03T00:00:00.000&quot;, &quot;2012-01-05T00:00:00.000/2012-01-07T00:00:00.000&quot;]</p>
+<h2><a class="anchor" aria-hidden="true" id="tuningconfig"></a><a href="#tuningconfig" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a><code>tuningConfig</code></h2>
+<p>The tuningConfig is optional and default parameters will be used if no tuningConfig is specified.</p>
+<table>
+<thead>
+<tr><th>Field</th><th>Type</th><th>Description</th><th>Required</th></tr>
+</thead>
+<tbody>
+<tr><td>workingPath</td><td>String</td><td>The working path to use for intermediate results (results between Hadoop jobs).</td><td>Only used by the <a href="#cli">Command-line Hadoop indexer</a>. The default is '/tmp/druid-indexing'. This field must be null otherwise.</td></tr>
+<tr><td>version</td><td>String</td><td>The version of created segments. Ignored for HadoopIndexTask unless useExplicitVersion is set to true</td><td>no (default == datetime that indexing starts at)</td></tr>
+<tr><td>partitionsSpec</td><td>Object</td><td>A specification of how to partition each time bucket into segments. Absence of this property means no partitioning will occur. See <a href="#partitionsspec"><code>partitionsSpec</code></a> below.</td><td>no (default == 'hashed')</td></tr>
+<tr><td>maxRowsInMemory</td><td>Integer</td><td>The number of rows to aggregate before persisting. Note that this is the number of post-aggregation rows which may not be equal to the number of input events due to roll-up. This is used to manage the required JVM heap size. Normally user does not need to set this, but depending on the nature of data, if rows are short in terms of bytes, user may not want to store a million rows in memory and this value should be set.</td><td>no (default == 1000000)</td></tr>
+<tr><td>maxBytesInMemory</td><td>Long</td><td>The number of bytes to aggregate in heap memory before persisting. Normally this is computed internally and user does not need to set it. This is based on a rough estimate of memory usage and not actual usage. The maximum heap memory usage for indexing is maxBytesInMemory * (2 + maxPendingPersists).</td><td>no (default == One-sixth of max JVM memory)</td></tr>
+<tr><td>leaveIntermediate</td><td>Boolean</td><td>Leave behind intermediate files (for debugging) in the workingPath when a job completes, whether it passes or fails.</td><td>no (default == false)</td></tr>
+<tr><td>cleanupOnFailure</td><td>Boolean</td><td>Clean up intermediate files when a job fails (unless leaveIntermediate is on).</td><td>no (default == true)</td></tr>
+<tr><td>overwriteFiles</td><td>Boolean</td><td>Override existing files found during indexing.</td><td>no (default == false)</td></tr>
+<tr><td>ignoreInvalidRows</td><td>Boolean</td><td>DEPRECATED. Ignore rows found to have problems. If false, any exception encountered during parsing will be thrown and will halt ingestion; if true, unparseable rows and fields will be skipped. If <code>maxParseExceptions</code> is defined, this property is ignored.</td><td>no (default == false)</td></tr>
+<tr><td>combineText</td><td>Boolean</td><td>Use CombineTextInputFormat to combine multiple files into a file split. This can speed up Hadoop jobs when processing a large number of small files.</td><td>no (default == false)</td></tr>
+<tr><td>useCombiner</td><td>Boolean</td><td>Use Hadoop combiner to merge rows at mapper if possible.</td><td>no (default == false)</td></tr>
+<tr><td>jobProperties</td><td>Object</td><td>A map of properties to add to the Hadoop job configuration, see below for details.</td><td>no (default == null)</td></tr>
+<tr><td>indexSpec</td><td>Object</td><td>Tune how data is indexed. See <a href="/docs/0.20.0/ingestion/index.html#indexspec"><code>indexSpec</code></a> on the main ingestion page for more information.</td><td>no</td></tr>
+<tr><td>indexSpecForIntermediatePersists</td><td>Object</td><td>defines segment storage format options to be used at indexing time for intermediate persisted temporary segments. this can be used to disable dimension/metric compression on intermediate segments to reduce memory required for final merging. however, disabling compression on intermediate segments might increase page cache use while they are used before getting merged into final segment published, see <a href="/docs/0.20.0/ingestion/index.html#indexspec"><code>indexSpec</code></a> for possible values.</td><td>no (default = same as indexSpec)</td></tr>
+<tr><td>numBackgroundPersistThreads</td><td>Integer</td><td>The number of new background threads to use for incremental persists. Using this feature causes a notable increase in memory pressure and CPU usage but will make the job finish more quickly. If changing from the default of 0 (use current thread for persists), we recommend setting it to 1.</td><td>no (default == 0)</td></tr>
+<tr><td>forceExtendableShardSpecs</td><td>Boolean</td><td>Forces use of extendable shardSpecs. Hash-based partitioning always uses an extendable shardSpec. For single-dimension partitioning, this option should be set to true to use an extendable shardSpec. For partitioning, please check <a href="#partitionsspec">Partitioning specification</a>. This option can be useful when you need to append more data to existing dataSource.</td><td>no (default = false)</td></tr>
+<tr><td>useExplicitVersion</td><td>Boolean</td><td>Forces HadoopIndexTask to use version.</td><td>no (default = false)</td></tr>
+<tr><td>logParseExceptions</td><td>Boolean</td><td>If true, log an error message when a parsing exception occurs, containing information about the row where the error occurred.</td><td>no(default = false)</td></tr>
+<tr><td>maxParseExceptions</td><td>Integer</td><td>The maximum number of parse exceptions that can occur before the task halts ingestion and fails. Overrides <code>ignoreInvalidRows</code> if <code>maxParseExceptions</code> is defined.</td><td>no(default = unlimited)</td></tr>
+<tr><td>useYarnRMJobStatusFallback</td><td>Boolean</td><td>If the Hadoop jobs created by the indexing task are unable to retrieve their completion status from the JobHistory server, and this parameter is true, the indexing task will try to fetch the application status from <code>http://&lt;yarn-rm-address&gt;/ws/v1/cluster/apps/&lt;application-id&gt;</code>, where <code>&lt;yarn-rm-address&gt;</code> is the value of <code>yarn.resourcemanager.webapp.address</code> in your Hadoop configuration. This flag is intended as a fallback for cases where an indexing task's jobs succeed, but the JobHistory server is unavailable, causing the indexing task to fail because it cannot determine the job statuses.</td><td>no (default = true)</td></tr>
+</tbody>
+</table>
+<h3><a class="anchor" aria-hidden="true" id="jobproperties"></a><a href="#jobproperties" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a><code>jobProperties</code></h3>
+<pre><code class="hljs css language-json">   "tuningConfig" : {
+     "type": "hadoop",
+     "jobProperties": {
+       "&lt;hadoop-property-a&gt;": "&lt;value-a&gt;",
+       "&lt;hadoop-property-b&gt;": "&lt;value-b&gt;"
+     }
+   }
+</code></pre>
+<p>Hadoop's <a href="https://hadoop.apache.org/docs/stable/hadoop-mapreduce-client/hadoop-mapreduce-client-core/mapred-default.xml">MapReduce documentation</a> lists the possible configuration parameters.</p>
+<p>With some Hadoop distributions, it may be necessary to set <code>mapreduce.job.classpath</code> or <code>mapreduce.job.user.classpath.first</code>
+to avoid class loading issues. See the <a href="/docs/0.20.0/operations/other-hadoop.html">working with different Hadoop versions documentation</a>
+for more details.</p>
+<h2><a class="anchor" aria-hidden="true" id="partitionsspec"></a><a href="#partitionsspec" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a><code>partitionsSpec</code></h2>
+<p>Segments are always partitioned based on timestamp (according to the granularitySpec) and may be further partitioned in
+some other way depending on partition type. Druid supports two types of partitioning strategies: <code>hashed</code> (based on the
+hash of all dimensions in each row), and <code>single_dim</code> (based on ranges of a single dimension).</p>
+<p>Hashed partitioning is recommended in most cases, as it will improve indexing performance and create more uniformly
+sized data segments relative to single-dimension partitioning.</p>
+<h3><a class="anchor" aria-hidden="true" id="hash-based-partitioning"></a><a href="#hash-based-partitioning" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Hash-based partitioning</h3>
+<pre><code class="hljs css language-json">  "partitionsSpec": {
+     "type": "hashed",
+     "targetRowsPerSegment": 5000000
+   }
+</code></pre>
+<p>Hashed partitioning works by first selecting a number of segments, and then partitioning rows across those segments
+according to the hash of all dimensions in each row. The number of segments is determined automatically based on the
+cardinality of the input set and a target partition size.</p>
+<p>The configuration options are:</p>
+<table>
+<thead>
+<tr><th>Field</th><th>Description</th><th>Required</th></tr>
+</thead>
+<tbody>
+<tr><td>type</td><td>Type of partitionSpec to be used.</td><td>&quot;hashed&quot;</td></tr>
+<tr><td>targetRowsPerSegment</td><td>Target number of rows to include in a partition, should be a number that targets segments of 500MB~1GB. Defaults to 5000000 if <code>numShards</code> is not set.</td><td>either this or <code>numShards</code></td></tr>
+<tr><td>targetPartitionSize</td><td>Deprecated. Renamed to <code>targetRowsPerSegment</code>. Target number of rows to include in a partition, should be a number that targets segments of 500MB~1GB.</td><td>either this or <code>numShards</code></td></tr>
+<tr><td>maxRowsPerSegment</td><td>Deprecated. Renamed to <code>targetRowsPerSegment</code>. Target number of rows to include in a partition, should be a number that targets segments of 500MB~1GB.</td><td>either this or <code>numShards</code></td></tr>
+<tr><td>numShards</td><td>Specify the number of partitions directly, instead of a target partition size. Ingestion will run faster, since it can skip the step necessary to select a number of partitions automatically.</td><td>either this or <code>maxRowsPerSegment</code></td></tr>
+<tr><td>partitionDimensions</td><td>The dimensions to partition on. Leave blank to select all dimensions. Only used with <code>numShards</code>, will be ignored when <code>targetRowsPerSegment</code> is set.</td><td>no</td></tr>
+<tr><td>partitionFunction</td><td>A function to compute hash of partition dimensions. See <a href="#hash-partition-function">Hash partition function</a></td><td><code>murmur3_32_abs</code></td><td>no</td></tr>
+</tbody>
+</table>
+<h5><a class="anchor" aria-hidden="true" id="hash-partition-function"></a><a href="#hash-partition-function" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Hash partition function</h5>
+<p>In hash partitioning, the partition function is used to compute hash of partition dimensions. The partition dimension
+values are first serialized into a byte array as a whole, and then the partition function is applied to compute hash of
+the byte array.
+Druid currently supports only one partition function.</p>
+<table>
+<thead>
+<tr><th>name</th><th>description</th></tr>
+</thead>
+<tbody>
+<tr><td><code>murmur3_32_abs</code></td><td>Applies an absolute value function to the result of <a href="https://guava.dev/releases/16.0/api/docs/com/google/common/hash/Hashing.html#murmur3_32()"><code>murmur3_32</code></a>.</td></tr>
+</tbody>
+</table>
+<h3><a class="anchor" aria-hidden="true" id="single-dimension-range-partitioning"></a><a href="#single-dimension-range-partitioning" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Single-dimension range partitioning</h3>
+<pre><code class="hljs css language-json">  "partitionsSpec": {
+     "type": "single_dim",
+     "targetRowsPerSegment": 5000000
+   }
+</code></pre>
+<p>Single-dimension range partitioning works by first selecting a dimension to partition on, and then separating that dimension
+into contiguous ranges. Each segment will contain all rows with values of that dimension in that range. For example,
+your segments may be partitioned on the dimension &quot;host&quot; using the ranges &quot;a.example.com&quot; to &quot;f.example.com&quot; and
+&quot;f.example.com&quot; to &quot;z.example.com&quot;. By default, the dimension to use is determined automatically, although you can
+override it with a specific dimension.</p>
+<p>The configuration options are:</p>
+<table>
+<thead>
+<tr><th>Field</th><th>Description</th><th>Required</th></tr>
+</thead>
+<tbody>
+<tr><td>type</td><td>Type of partitionSpec to be used.</td><td>&quot;single_dim&quot;</td></tr>
+<tr><td>targetRowsPerSegment</td><td>Target number of rows to include in a partition, should be a number that targets segments of 500MB~1GB.</td><td>yes</td></tr>
+<tr><td>targetPartitionSize</td><td>Deprecated. Renamed to <code>targetRowsPerSegment</code>. Target number of rows to include in a partition, should be a number that targets segments of 500MB~1GB.</td><td>no</td></tr>
+<tr><td>maxRowsPerSegment</td><td>Maximum number of rows to include in a partition. Defaults to 50% larger than the <code>targetRowsPerSegment</code>.</td><td>no</td></tr>
+<tr><td>maxPartitionSize</td><td>Deprecated. Use <code>maxRowsPerSegment</code> instead. Maximum number of rows to include in a partition. Defaults to 50% larger than the <code>targetPartitionSize</code>.</td><td>no</td></tr>
+<tr><td>partitionDimension</td><td>The dimension to partition on. Leave blank to select a dimension automatically.</td><td>no</td></tr>
+<tr><td>assumeGrouped</td><td>Assume that input data has already been grouped on time and dimensions. Ingestion will run faster, but may choose sub-optimal partitions if this assumption is violated.</td><td>no</td></tr>
+</tbody>
+</table>
+<h2><a class="anchor" aria-hidden="true" id="remote-hadoop-clusters"></a><a href="#remote-hadoop-clusters" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Remote Hadoop clusters</h2>
+<p>If you have a remote Hadoop cluster, make sure to include the folder holding your configuration <code>*.xml</code> files in your Druid <code>_common</code> configuration folder.</p>
+<p>If you are having dependency problems with your version of Hadoop and the version compiled with Druid, please see <a href="/docs/0.20.0/operations/other-hadoop.html">these docs</a>.</p>
+<h2><a class="anchor" aria-hidden="true" id="elastic-mapreduce"></a><a href="#elastic-mapreduce" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Elastic MapReduce</h2>
+<p>If your cluster is running on Amazon Web Services, you can use Elastic MapReduce (EMR) to index data
+from S3. To do this:</p>
+<ul>
+<li>Create a persistent, <a href="http://docs.aws.amazon.com/ElasticMapReduce/latest/ManagementGuide/emr-plan-longrunning-transient.html">long-running cluster</a>.</li>
+<li>When creating your cluster, enter the following configuration. If you're using the wizard, this
+should be in advanced mode under &quot;Edit software settings&quot;:</li>
+</ul>
+<pre><code class="hljs"><span class="hljs-attribute">classification</span>=yarn-site,properties=[mapreduce.reduce.memory.<span class="hljs-attribute">mb</span>=6144,mapreduce.reduce.java.opts=-server -Xms2g -Xmx2g -Duser.<span class="hljs-attribute">timezone</span>=UTC -Dfile.<span class="hljs-attribute">encoding</span>=UTF-8 -XX:+PrintGCDetails -XX:+PrintGCTimeStamps,mapreduce.map.java.<span class="hljs-attribute">opts</span>=758,mapreduce.map.java.opts=-server -Xms512m -Xmx512m -Duser.<span class="hljs-attribute">timezone</span>=UTC -Dfile.<span class="hljs-attribute">encoding</span>=UTF-8 -XX:+PrintGCDetails -XX:+PrintGCTimeStamps,mapreduce.task.<span class="hljs-attribute">timeout</span>=1800000]
+</code></pre>
+<ul>
+<li>Follow the instructions under
+<a href="/docs/0.20.0/tutorials/cluster.html#hadoop">Configure for connecting to Hadoop</a> using the XML files from <code>/etc/hadoop/conf</code>
+on your EMR master.</li>
+</ul>
+<h2><a class="anchor" aria-hidden="true" id="kerberized-hadoop-clusters"></a><a href="#kerberized-hadoop-clusters" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Kerberized Hadoop clusters</h2>
+<p>By default druid can use the existing TGT kerberos ticket available in local kerberos key cache.
+Although TGT ticket has a limited life cycle,
+therefore you need to call <code>kinit</code> command periodically to ensure validity of TGT ticket.
+To avoid this extra external cron job script calling <code>kinit</code> periodically,
+you can provide the principal name and keytab location and druid will do the authentication transparently at startup and job launching time.</p>
+<table>
+<thead>
+<tr><th>Property</th><th>Possible Values</th><th>Description</th><th>Default</th></tr>
+</thead>
+<tbody>
+<tr><td><code>druid.hadoop.security.kerberos.principal</code></td><td><code>druid@EXAMPLE.COM</code></td><td>Principal user name</td><td>empty</td></tr>
+<tr><td><code>druid.hadoop.security.kerberos.keytab</code></td><td><code>/etc/security/keytabs/druid.headlessUser.keytab</code></td><td>Path to keytab file</td><td>empty</td></tr>
+</tbody>
+</table>
+<h3><a class="anchor" aria-hidden="true" id="loading-from-s3-with-emr"></a><a href="#loading-from-s3-with-emr" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Loading from S3 with EMR</h3>
+<ul>
+<li>In the <code>jobProperties</code> field in the <code>tuningConfig</code> section of your Hadoop indexing task, add:</li>
+</ul>
+<pre><code class="hljs"><span class="hljs-string">"jobProperties"</span> : {
+   <span class="hljs-string">"fs.s3.awsAccessKeyId"</span> : "<span class="hljs-type">YOUR_ACCESS_KEY</span><span class="hljs-string">",
+   "</span>fs.s3.awsSecretAccessKey<span class="hljs-string">" : "</span>YOUR_SECRET_KEY<span class="hljs-string">",
+   "</span>fs.s3.impl<span class="hljs-string">" : "</span>org.apache.hadoop.fs.s3native.NativeS3FileSystem<span class="hljs-string">",
+   "</span>fs.s3n.awsAccessKeyId<span class="hljs-string">" : "</span>YOUR_ACCESS_KEY<span class="hljs-string">",
+   "</span>fs.s3n.awsSecretAccessKey<span class="hljs-string">" : "</span>YOUR_SECRET_KEY<span class="hljs-string">",
+   "</span>fs.s3n.impl<span class="hljs-string">" : "</span>org.apache.hadoop.fs.s3native.NativeS3FileSystem<span class="hljs-string">",
+   "</span>io.compression.codecs<span class="hljs-string">" : "</span>org.apache.hadoop.io.compress.GzipCodec,org.apache.hadoop.io.compress.DefaultCodec,org.apache.hadoop.io.compress.BZip2Codec,org.apache.hadoop.io.compress.SnappyCodec<span class="hljs-string">"
+}
+</span></code></pre>
+<p>Note that this method uses Hadoop's built-in S3 filesystem rather than Amazon's EMRFS, and is not compatible
+with Amazon-specific features such as S3 encryption and consistent views. If you need to use these
+features, you will need to make the Amazon EMR Hadoop JARs available to Druid through one of the
+mechanisms described in the <a href="#using-other-hadoop-distributions">Using other Hadoop distributions</a> section.</p>
+<h2><a class="anchor" aria-hidden="true" id="using-other-hadoop-distributions"></a><a href="#using-other-hadoop-distributions" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Using other Hadoop distributions</h2>
+<p>Druid works out of the box with many Hadoop distributions.</p>
+<p>If you are having dependency conflicts between Druid and your version of Hadoop, you can try
+searching for a solution in the <a href="https://groups.google.com/forum/#!forum/druid-user">Druid user groups</a>, or reading the
+Druid <a href="/docs/0.20.0/operations/other-hadoop.html">Different Hadoop Versions</a> documentation.</p>
+<p><a name="cli"></a></p>
+<h2><a class="anchor" aria-hidden="true" id="command-line-non-task-version"></a><a href="#command-line-non-task-version" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Command line (non-task) version</h2>
+<p>To run:</p>
+<pre><code class="hljs">java -Xmx256m -Duser.timezone=UTC -Dfile.encoding=UTF-<span class="hljs-number">8</span> -classpath <span class="hljs-class"><span class="hljs-keyword">lib</span>/*:&lt;<span class="hljs-title">hadoop_config_dir</span>&gt; <span class="hljs-title">org</span>.<span class="hljs-title">apache</span>.<span class="hljs-title">druid</span>.<span class="hljs-title">cli</span>.<span class="hljs-title">Main</span> <span class="hljs-title">index</span> <span class="hljs-title">hadoop</span> &lt;<span class="hljs-title">spec_file</span>&gt;</span>
+</code></pre>
+<h3><a class="anchor" aria-hidden="true" id="options"></a><a href="#options" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Options</h3>
+<ul>
+<li>&quot;--coordinate&quot; - provide a version of Apache Hadoop to use. This property will override the default Hadoop coordinates. Once specified, Apache Druid will look for those Hadoop dependencies from the location specified by <code>druid.extensions.hadoopDependenciesDir</code>.</li>
+<li>&quot;--no-default-hadoop&quot; - don't pull down the default hadoop version</li>
+</ul>
+<h3><a class="anchor" aria-hidden="true" id="spec-file"></a><a href="#spec-file" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Spec file</h3>
+<p>The spec file needs to contain a JSON object where the contents are the same as the &quot;spec&quot; field in the Hadoop index task. See <a href="/docs/0.20.0/ingestion/hadoop.html">Hadoop Batch Ingestion</a> for details on the spec format.</p>
+<p>In addition, a <code>metadataUpdateSpec</code> and <code>segmentOutputPath</code> field needs to be added to the ioConfig:</p>
+<pre><code class="hljs">      <span class="hljs-string">"ioConfig"</span> : {
+        ...
+        <span class="hljs-string">"metadataUpdateSpec"</span> : {
+          <span class="hljs-string">"type"</span>:<span class="hljs-string">"mysql"</span>,
+          <span class="hljs-string">"connectURI"</span> : "<span class="hljs-type">jdbc</span>:mysql://localhost:<span class="hljs-number">3306</span>/druid<span class="hljs-string">",
+          "</span>password<span class="hljs-string">" : "</span>diurd<span class="hljs-string">",
+          "</span>segmentTable<span class="hljs-string">" : "</span>druid_segments<span class="hljs-string">",
+          "</span>user<span class="hljs-string">" : "</span>druid<span class="hljs-string">"
+        },
+        "</span>segmentOutputPath<span class="hljs-string">" : "</span>/MyDirectory/data/index/output<span class="hljs-string">"
+      },
+</span></code></pre>
+<p>and a <code>workingPath</code> field needs to be added to the tuningConfig:</p>
+<pre><code class="hljs">  <span class="hljs-string">"tuningConfig"</span> : {
+   <span class="hljs-string">...</span>
+    <span class="hljs-string">"workingPath"</span>: <span class="hljs-string">"/tmp"</span>,
+    <span class="hljs-string">...</span>
+  }
+</code></pre>
+<h4><a class="anchor" aria-hidden="true" id="metadata-update-job-spec"></a><a href="#metadata-update-job-spec" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Metadata Update Job Spec</h4>
+<p>This is a specification of the properties that tell the job how to update metadata such that the Druid cluster will see the output segments and load them.</p>
+<table>
+<thead>
+<tr><th>Field</th><th>Type</th><th>Description</th><th>Required</th></tr>
+</thead>
+<tbody>
+<tr><td>type</td><td>String</td><td>&quot;metadata&quot; is the only value available.</td><td>yes</td></tr>
+<tr><td>connectURI</td><td>String</td><td>A valid JDBC url to metadata storage.</td><td>yes</td></tr>
+<tr><td>user</td><td>String</td><td>Username for db.</td><td>yes</td></tr>
+<tr><td>password</td><td>String</td><td>password for db.</td><td>yes</td></tr>
+<tr><td>segmentTable</td><td>String</td><td>Table to use in DB.</td><td>yes</td></tr>
+</tbody>
+</table>
+<p>These properties should parrot what you have configured for your <a href="/docs/0.20.0/design/coordinator.html">Coordinator</a>.</p>
+<h4><a class="anchor" aria-hidden="true" id="segmentoutputpath-config"></a><a href="#segmentoutputpath-config" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>segmentOutputPath Config</h4>
+<table>
+<thead>
+<tr><th>Field</th><th>Type</th><th>Description</th><th>Required</th></tr>
+</thead>
+<tbody>
+<tr><td>segmentOutputPath</td><td>String</td><td>the path to dump segments into.</td><td>yes</td></tr>
+</tbody>
+</table>
+<h4><a class="anchor" aria-hidden="true" id="workingpath-config"></a><a href="#workingpath-config" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>workingPath Config</h4>
+<table>
+<thead>
+<tr><th>Field</th><th>Type</th><th>Description</th><th>Required</th></tr>
+</thead>
+<tbody>
+<tr><td>workingPath</td><td>String</td><td>the working path to use for intermediate results (results between Hadoop jobs).</td><td>no (default == '/tmp/druid-indexing')</td></tr>
+</tbody>
+</table>
+<p>Please note that the command line Hadoop indexer doesn't have the locking capabilities of the indexing service, so if you choose to use it,
+you have to take caution to not override segments created by real-time processing (if you that a real-time pipeline set up).</p>
+</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/0.20.0/ingestion/native-batch.html"><span class="arrow-prev">← </span><span>Native batch</span></a><a class="docs-next button" href="/docs/0.20.0/ingestion/tasks.html"><span>Task reference</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#tutorial">Tutorial</a></li><li><a href="#task-syntax">Task syntax</a></li><li><a href="#dataschema"><code>dataSchema</code></a></li><li><a href="#ioconfig"><code>ioConfig</code></a><ul class="toc-headings"><li><a href="#inputspec"><code>inputSpec</code></a></li></ul></li><li><a href="#tuningconfig"><code>tuningConfig</code></a><ul class="toc-headings"><li><a href="#jobproperties"><code>jobProperties</code></a></li></ul></li><li><a href="#partitionsspec"><code>partitionsSpec</code></a><ul class="toc-headings"><li><a href="#hash-based-partitioning">Hash-based partitioning</a></li><li><a href="#single-dimension-range-partitioning">Single-dimension range partitioning</a></li></ul></li><li><a href="#remote-hadoop-clusters">Remote Hadoop clusters</a></li><li><a href="#elastic-mapreduce">Elastic MapReduce</a></li><li><a href="#kerberized-hadoop-clusters">Kerberized Hadoop clusters</a><ul class="toc-headings"><li><a href="#loading-from-s3-with-emr">Loading from S3 with EMR</a></li></ul></li><li><a href="#using-other-hadoop-distributions">Using other Hadoop distributions</a></li><li><a href="#command-line-non-task-version">Command line (non-task) version</a><ul class="toc-headings"><li><a href="#options">Options</a></li><li><a href="#spec-file">Spec file</a></li></ul></li></ul></nav></div><footer class="nav-footer druid-footer" id="footer"><div class="container"><div class="text-center"><p><a href="/technology">Technology</a> · <a href="/use-cases">Use Cases</a> · <a href="/druid-powered">Powered by Druid</a> · <a href="/docs/0.20.0/latest">Docs</a> · <a href="/community/">Community</a> · <a href="/downloads.html">Download</a> · <a href="/faq">FAQ</a></p></div><div class="text-center"><a title="Join the user group" href="https://groups.google.com/forum/#!forum/druid-user" target="_blank"><span class="fa fa-comments"></span></a> · <a title="Follow Druid" href="https://twitter.com/druidio" target="_blank"><span class="fab fa-twitter"></span></a> · <a title="Download via Apache" href="https://www.apache.org/dyn/closer.cgi?path=/incubator/druid/{{ site.druid_versions[0].versions[0].version }}/apache-druid-{{ site.druid_versions[0].versions[0].version }}-bin.tar.gz" target="_blank"><span class="fas fa-feather"></span></a> · <a title="GitHub" href="https://github.com/apache/druid" target="_blank"><span class="fab fa-github"></span></a></div><div class="text-center license">Copyright © 2019 <a href="https://www.apache.org/" target="_blank">Apache Software Foundation</a>.<br/>Except where otherwise noted, licensed under <a rel="license" href="http://creativecommons.org/licenses/by-sa/4.0/">CC BY-SA 4.0</a>.<br/>Apache Druid, Druid, and the Druid logo are either registered trademarks or trademarks of The Apache Software Foundation in the United States and other countries.</div></div></footer></div><script type="text/javascript" src="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.js"></script><script>
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+  ~ Licensed to the Apache Software Foundation (ASF) under one
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+<h2><a class="anchor" aria-hidden="true" id="overview"></a><a href="#overview" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Overview</h2>
+<p>All data in Druid is organized into <em>segments</em>, which are data files that generally have up to a few million rows each.
+Loading data in Druid is called <em>ingestion</em> or <em>indexing</em> and consists of reading data from a source system and creating
+segments based on that data.</p>
+<p>In most ingestion methods, the work of loading data is done by Druid <a href="/docs/0.20.0/design/middlemanager.html">MiddleManager</a> processes
+(or the <a href="/docs/0.20.0/design/indexer.html">Indexer</a> processes). One exception is
+Hadoop-based ingestion, where this work is instead done using a Hadoop MapReduce job on YARN (although MiddleManager or Indexer
+processes are still involved in starting and monitoring the Hadoop jobs). Once segments have been generated and stored
+in <a href="/docs/0.20.0/dependencies/deep-storage.html">deep storage</a>, they will be loaded by Historical processes. For more details on
+how this works under the hood, see the <a href="/docs/0.20.0/design/architecture.html#storage-design">Storage design</a> section of Druid's design
+documentation.</p>
+<h2><a class="anchor" aria-hidden="true" id="how-to-use-this-documentation"></a><a href="#how-to-use-this-documentation" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>How to use this documentation</h2>
+<p>This <strong>page you are currently reading</strong> provides information about universal Druid ingestion concepts, and about
+configurations that are common to all <a href="#ingestion-methods">ingestion methods</a>.</p>
+<p>The <strong>individual pages for each ingestion method</strong> provide additional information about concepts and configurations
+that are unique to each ingestion method.</p>
+<p>We recommend reading (or at least skimming) this universal page first, and then referring to the page for the
+ingestion method or methods that you have chosen.</p>
+<h2><a class="anchor" aria-hidden="true" id="ingestion-methods"></a><a href="#ingestion-methods" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Ingestion methods</h2>
+<p>The table below lists Druid's most common data ingestion methods, along with comparisons to help you choose
+the best one for your situation. Each ingestion method supports its own set of source systems to pull from. For details
+about how each method works, as well as configuration properties specific to that method, check out its documentation
+page.</p>
+<h3><a class="anchor" aria-hidden="true" id="streaming"></a><a href="#streaming" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Streaming</h3>
+<p>The most recommended, and most popular, method of streaming ingestion is the
+<a href="/docs/0.20.0/development/extensions-core/kafka-ingestion.html">Kafka indexing service</a> that reads directly from Kafka. The Kinesis
+indexing service also works well if you prefer Kinesis.</p>
+<p>This table compares the major available options:</p>
+<table>
+<thead>
+<tr><th><strong>Method</strong></th><th><a href="/docs/0.20.0/development/extensions-core/kafka-ingestion.html">Kafka</a></th><th><a href="/docs/0.20.0/development/extensions-core/kinesis-ingestion.html">Kinesis</a></th><th><a href="/docs/0.20.0/ingestion/tranquility.html">Tranquility</a></th></tr>
+</thead>
+<tbody>
+<tr><td><strong>Supervisor type</strong></td><td><code>kafka</code></td><td><code>kinesis</code></td><td>N/A</td></tr>
+<tr><td><strong>How it works</strong></td><td>Druid reads directly from Apache Kafka.</td><td>Druid reads directly from Amazon Kinesis.</td><td>Tranquility, a library that ships separately from Druid, is used to push data into Druid.</td></tr>
+<tr><td><strong>Can ingest late data?</strong></td><td>Yes</td><td>Yes</td><td>No (late data is dropped based on the <code>windowPeriod</code> config)</td></tr>
+<tr><td><strong>Exactly-once guarantees?</strong></td><td>Yes</td><td>Yes</td><td>No</td></tr>
+</tbody>
+</table>
+<h3><a class="anchor" aria-hidden="true" id="batch"></a><a href="#batch" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Batch</h3>
+<p>When doing batch loads from files, you should use one-time <a href="/docs/0.20.0/ingestion/tasks.html">tasks</a>, and you have three options: <code>index_parallel</code> (native batch; parallel), <code>index_hadoop</code> (Hadoop-based),
+or <code>index</code> (native batch; single-task).</p>
+<p>In general, we recommend native batch whenever it meets your needs, since the setup is simpler (it does not depend on
+an external Hadoop cluster). However, there are still scenarios where Hadoop-based batch ingestion might be a better choice,
+for example when you already have a running Hadoop cluster and want to
+use the cluster resource of the existing cluster for batch ingestion.</p>
+<p>This table compares the three available options:</p>
+<table>
+<thead>
+<tr><th><strong>Method</strong></th><th><a href="native-batch.html#parallel-task">Native batch (parallel)</a></th><th><a href="hadoop.html">Hadoop-based</a></th><th><a href="native-batch.html#simple-task">Native batch (simple)</a></th></tr>
+</thead>
+<tbody>
+<tr><td><strong>Task type</strong></td><td><code>index_parallel</code></td><td><code>index_hadoop</code></td><td><code>index</code></td></tr>
+<tr><td><strong>Parallel?</strong></td><td>Yes, if <code>inputFormat</code> is splittable and <code>maxNumConcurrentSubTasks</code> &gt; 1 in <code>tuningConfig</code>. See <a href="/docs/0.20.0/ingestion/data-formats.html">data format documentation</a> for details.</td><td>Yes, always.</td><td>No. Each task is single-threaded.</td></tr>
+<tr><td><strong>Can append or overwrite?</strong></td><td>Yes, both.</td><td>Overwrite only.</td><td>Yes, both.</td></tr>
+<tr><td><strong>External dependencies</strong></td><td>None.</td><td>Hadoop cluster (Druid submits Map/Reduce jobs).</td><td>None.</td></tr>
+<tr><td><strong>Input locations</strong></td><td>Any <a href="/docs/0.20.0/ingestion/native-batch.html#input-sources"><code>inputSource</code></a>.</td><td>Any Hadoop FileSystem or Druid datasource.</td><td>Any <a href="/docs/0.20.0/ingestion/native-batch.html#input-sources"><code>inputSource</code></a>.</td></tr>
+<tr><td><strong>File formats</strong></td><td>Any <a href="/docs/0.20.0/ingestion/data-formats.html#input-format"><code>inputFormat</code></a>.</td><td>Any Hadoop InputFormat.</td><td>Any <a href="/docs/0.20.0/ingestion/data-formats.html#input-format"><code>inputFormat</code></a>.</td></tr>
+<tr><td><strong><a href="#rollup">Rollup modes</a></strong></td><td>Perfect if <code>forceGuaranteedRollup</code> = true in the <a href="/docs/0.20.0/ingestion/native-batch.html#tuningconfig"><code>tuningConfig</code></a>.</td><td>Always perfect.</td><td>Perfect if <code>forceGuaranteedRollup</code> = true in the <a href="/docs/0.20.0/ingestion/native-batch.html#tuningconfig"><code>tuningConfig</code></a>.</td></tr>
+<tr><td><strong>Partitioning options</strong></td><td>Dynamic, hash-based, and range-based partitioning methods are available. See <a href="/docs/0.20.0/ingestion/native-batch.html#partitionsspec">Partitions Spec</a> for details.</td><td>Hash-based or range-based partitioning via <a href="/docs/0.20.0/ingestion/hadoop.html#partitionsspec"><code>partitionsSpec</code></a>.</td><td>Dynamic and hash-based partitioning methods are available. See <a href="/docs/0.20.0/ingestion/native-batch.html#partitionsspec-1">Partitions Spec</a> for details.</td></tr>
+</tbody>
+</table>
+<p><a name="data-model"></a></p>
+<h2><a class="anchor" aria-hidden="true" id="druids-data-model"></a><a href="#druids-data-model" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Druid's data model</h2>
+<h3><a class="anchor" aria-hidden="true" id="datasources"></a><a href="#datasources" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Datasources</h3>
+<p>Druid data is stored in datasources, which are similar to tables in a traditional RDBMS. Druid
+offers a unique data modeling system that bears similarity to both relational and timeseries models.</p>
+<h3><a class="anchor" aria-hidden="true" id="primary-timestamp"></a><a href="#primary-timestamp" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Primary timestamp</h3>
+<p>Druid schemas must always include a primary timestamp. The primary timestamp is used for
+<a href="#partitioning">partitioning and sorting</a> your data. Druid queries are able to rapidly identify and retrieve data
+corresponding to time ranges of the primary timestamp column. Druid is also able to use the primary timestamp column
+for time-based <a href="data-management.html">data management operations</a> such as dropping time chunks, overwriting time chunks,
+and time-based retention rules.</p>
+<p>The primary timestamp is parsed based on the <a href="#timestampspec"><code>timestampSpec</code></a>. In addition, the
+<a href="#granularityspec"><code>granularitySpec</code></a> controls other important operations that are based on the primary timestamp.
+Regardless of which input field the primary timestamp is read from, it will always be stored as a column named <code>__time</code>
+in your Druid datasource.</p>
+<p>If you have more than one timestamp column, you can store the others as
+<a href="/docs/0.20.0/ingestion/schema-design.html#secondary-timestamps">secondary timestamps</a>.</p>
+<h3><a class="anchor" aria-hidden="true" id="dimensions"></a><a href="#dimensions" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Dimensions</h3>
+<p>Dimensions are columns that are stored as-is and can be used for any purpose. You can group, filter, or apply
+aggregators to dimensions at query time in an ad-hoc manner. If you run with <a href="#rollup">rollup</a> disabled, then the set of
+dimensions is simply treated like a set of columns to ingest, and behaves exactly as you would expect from a typical
+database that does not support a rollup feature.</p>
+<p>Dimensions are configured through the <a href="#dimensionsspec"><code>dimensionsSpec</code></a>.</p>
+<h3><a class="anchor" aria-hidden="true" id="metrics"></a><a href="#metrics" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Metrics</h3>
+<p>Metrics are columns that are stored in an aggregated form. They are most useful when <a href="#rollup">rollup</a> is enabled.
+Specifying a metric allows you to choose an aggregation function for Druid to apply to each row during ingestion. This
+has two benefits:</p>
+<ol>
+<li>If <a href="#rollup">rollup</a> is enabled, multiple rows can be collapsed into one row even while retaining summary
+information. In the <a href="/docs/0.20.0/tutorials/tutorial-rollup.html">rollup tutorial</a>, this is used to collapse netflow data to a
+single row per <code>(minute, srcIP, dstIP)</code> tuple, while retaining aggregate information about total packet and byte counts.</li>
+<li>Some aggregators, especially approximate ones, can be computed faster at query time even on non-rolled-up data if
+they are partially computed at ingestion time.</li>
+</ol>
+<p>Metrics are configured through the <a href="#metricsspec"><code>metricsSpec</code></a>.</p>
+<h2><a class="anchor" aria-hidden="true" id="rollup"></a><a href="#rollup" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Rollup</h2>
+<h3><a class="anchor" aria-hidden="true" id="what-is-rollup"></a><a href="#what-is-rollup" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>What is rollup?</h3>
+<p>Druid can roll up data as it is ingested to minimize the amount of raw data that needs to be stored. Rollup is
+a form of summarization or pre-aggregation. In practice, rolling up data can dramatically reduce the size of data that
+needs to be stored, reducing row counts by potentially orders of magnitude. This storage reduction does come at a cost:
+as we roll up data, we lose the ability to query individual events.</p>
+<p>When rollup is disabled, Druid loads each row as-is without doing any form of pre-aggregation. This mode is similar
+to what you would expect from a typical database that does not support a rollup feature.</p>
+<p>When rollup is enabled, then any rows that have identical <a href="#dimensions">dimensions</a> and <a href="#primary-timestamp">timestamp</a>
+to each other (after <a href="#granularityspec"><code>queryGranularity</code>-based truncation</a>) can be collapsed, or <em>rolled up</em>, into a
+single row in Druid.</p>
+<p>By default, rollup is enabled.</p>
+<h3><a class="anchor" aria-hidden="true" id="enabling-or-disabling-rollup"></a><a href="#enabling-or-disabling-rollup" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Enabling or disabling rollup</h3>
+<p>Rollup is controlled by the <code>rollup</code> setting in the <a href="#granularityspec"><code>granularitySpec</code></a>. By default, it is <code>true</code>
+(enabled). Set this to <code>false</code> if you want Druid to store each record as-is, without any rollup summarization.</p>
+<h3><a class="anchor" aria-hidden="true" id="example-of-rollup"></a><a href="#example-of-rollup" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Example of rollup</h3>
+<p>For an example of how to configure rollup, and of how the feature will modify your data, check out the
+<a href="/docs/0.20.0/tutorials/tutorial-rollup.html">rollup tutorial</a>.</p>
+<h3><a class="anchor" aria-hidden="true" id="maximizing-rollup-ratio"></a><a href="#maximizing-rollup-ratio" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Maximizing rollup ratio</h3>
+<p>You can measure the rollup ratio of a datasource by comparing the number of rows in Druid with the number of ingested
+events. The higher this number, the more benefit you are gaining from rollup. One way to do this is with a
+<a href="/docs/0.20.0/querying/sql.html">Druid SQL</a> query like:</p>
+<pre><code class="hljs css language-sql"><span class="hljs-keyword">SELECT</span> <span class="hljs-keyword">SUM</span>(<span class="hljs-string">"cnt"</span>) / <span class="hljs-keyword">COUNT</span>(*) * <span class="hljs-number">1.0</span> <span class="hljs-keyword">FROM</span> datasource
+</code></pre>
+<p>In this query, <code>cnt</code> should refer to a &quot;count&quot; type metric specified at ingestion time. See
+<a href="/docs/0.20.0/ingestion/schema-design.html#counting">Counting the number of ingested events</a> on the &quot;Schema design&quot; page for more details about
+how counting works when rollup is enabled.</p>
+<p>Tips for maximizing rollup:</p>
+<ul>
+<li>Generally, the fewer dimensions you have, and the lower the cardinality of your dimensions, the better rollup ratios
+you will achieve.</li>
+<li>Use <a href="schema-design.html#sketches">sketches</a> to avoid storing high cardinality dimensions, which harm rollup ratios.</li>
+<li>Adjusting <code>queryGranularity</code> at ingestion time (for example, using <code>PT5M</code> instead of <code>PT1M</code>) increases the
+likelihood of two rows in Druid having matching timestamps, and can improve your rollup ratios.</li>
+<li>It can be beneficial to load the same data into more than one Druid datasource. Some users choose to create a &quot;full&quot;
+datasource that has rollup disabled (or enabled, but with a minimal rollup ratio) and an &quot;abbreviated&quot; datasource that
+has fewer dimensions and a higher rollup ratio. When queries only involve dimensions in the &quot;abbreviated&quot; set, using
+that datasource leads to much faster query times. This can often be done with just a small increase in storage
+footprint, since abbreviated datasources tend to be substantially smaller.</li>
+<li>If you are using a <a href="#perfect-rollup-vs-best-effort-rollup">best-effort rollup</a> ingestion configuration that does not guarantee perfect
+rollup, you can potentially improve your rollup ratio by switching to a guaranteed perfect rollup option, or by
+<a href="/docs/0.20.0/ingestion/data-management.html#compaction-and-reindexing">reindexing</a> your data in the background after initial ingestion.</li>
+</ul>
+<h3><a class="anchor" aria-hidden="true" id="perfect-rollup-vs-best-effort-rollup"></a><a href="#perfect-rollup-vs-best-effort-rollup" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Perfect rollup vs Best-effort rollup</h3>
+<p>Some Druid ingestion methods guarantee <em>perfect rollup</em>, meaning that input data are perfectly aggregated at ingestion
+time. Others offer <em>best-effort rollup</em>, meaning that input data might not be perfectly aggregated and thus there could
+be multiple segments holding rows with the same timestamp and dimension values.</p>
+<p>In general, ingestion methods that offer best-effort rollup do this because they are either parallelizing ingestion
+without a shuffling step (which would be required for perfect rollup), or because they are finalizing and publishing
+segments before all data for a time chunk has been received, which we call <em>incremental publishing</em>. In both of these
+cases, records that could theoretically be rolled up may end up in different segments. All types of streaming ingestion
+run in this mode.</p>
+<p>Ingestion methods that guarantee perfect rollup do it with an additional preprocessing step to determine intervals
+and partitioning before the actual data ingestion stage. This preprocessing step scans the entire input dataset, which
+generally increases the time required for ingestion, but provides information necessary for perfect rollup.</p>
+<p>The following table shows how each method handles rollup:</p>
+<table>
+<thead>
+<tr><th>Method</th><th>How it works</th></tr>
+</thead>
+<tbody>
+<tr><td><a href="native-batch.html">Native batch</a></td><td><code>index_parallel</code> and <code>index</code> type may be either perfect or best-effort, based on configuration.</td></tr>
+<tr><td><a href="hadoop.html">Hadoop</a></td><td>Always perfect.</td></tr>
+<tr><td><a href="/docs/0.20.0/development/extensions-core/kafka-ingestion.html">Kafka indexing service</a></td><td>Always best-effort.</td></tr>
+<tr><td><a href="/docs/0.20.0/development/extensions-core/kinesis-ingestion.html">Kinesis indexing service</a></td><td>Always best-effort.</td></tr>
+</tbody>
+</table>
+<h2><a class="anchor" aria-hidden="true" id="partitioning"></a><a href="#partitioning" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Partitioning</h2>
+<h3><a class="anchor" aria-hidden="true" id="why-partition"></a><a href="#why-partition" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Why partition?</h3>
+<p>Optimal partitioning and sorting of segments within your datasources can have substantial impact on footprint and
+performance.</p>
+<p>Druid datasources are always partitioned by time into <em>time chunks</em>, and each time chunk contains one or more segments.
+This partitioning happens for all ingestion methods, and is based on the <code>segmentGranularity</code> parameter of your
+ingestion spec's <code>dataSchema</code>.</p>
+<p>The segments within a particular time chunk may also be partitioned further, using options that vary based on the
+ingestion type you have chosen. In general, doing this secondary partitioning using a particular dimension will
+improve locality, meaning that rows with the same value for that dimension are stored together and can be accessed
+quickly.</p>
+<p>You will usually get the best performance and smallest overall footprint by partitioning your data on some &quot;natural&quot;
+dimension that you often filter by, if one exists. This will often improve compression - users have reported threefold
+storage size decreases - and it also tends to improve query performance as well.</p>
+<blockquote>
+<p>Partitioning and sorting are best friends! If you do have a &quot;natural&quot; partitioning dimension, you should also consider
+placing it first in the <code>dimensions</code> list of your <code>dimensionsSpec</code>, which tells Druid to sort rows within each segment
+by that column. This will often improve compression even more, beyond the improvement gained by partitioning alone.</p>
+<p>However, note that currently, Druid always sorts rows within a segment by timestamp first, even before the first
+dimension listed in your <code>dimensionsSpec</code>. This can prevent dimension sorting from being maximally effective. If
+necessary, you can work around this limitation by setting <code>queryGranularity</code> equal to <code>segmentGranularity</code> in your
+<a href="#granularityspec"><code>granularitySpec</code></a>, which will set all timestamps within the segment to the same value, and by saving
+your &quot;real&quot; timestamp as a <a href="/docs/0.20.0/ingestion/schema-design.html#secondary-timestamps">secondary timestamp</a>. This limitation may be removed
+in a future version of Druid.</p>
+</blockquote>
+<h3><a class="anchor" aria-hidden="true" id="how-to-set-up-partitioning"></a><a href="#how-to-set-up-partitioning" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>How to set up partitioning</h3>
+<p>Not all ingestion methods support an explicit partitioning configuration, and not all have equivalent levels of
+flexibility. As of current Druid versions, If you are doing initial ingestion through a less-flexible method (like
+Kafka) then you can use <a href="data-management.html#compaction-and-reindexing">reindexing techniques</a> to repartition your data after it
+is initially ingested. This is a powerful technique: you can use it to ensure that any data older than a certain
+threshold is optimally partitioned, even as you continuously add new data from a stream.</p>
+<p>The following table shows how each ingestion method handles partitioning:</p>
+<table>
+<thead>
+<tr><th>Method</th><th>How it works</th></tr>
+</thead>
+<tbody>
+<tr><td><a href="native-batch.html">Native batch</a></td><td>Configured using <a href="native-batch.html#partitionsspec"><code>partitionsSpec</code></a> inside the <code>tuningConfig</code>.</td></tr>
+<tr><td><a href="hadoop.html">Hadoop</a></td><td>Configured using <a href="hadoop.html#partitionsspec"><code>partitionsSpec</code></a> inside the <code>tuningConfig</code>.</td></tr>
+<tr><td><a href="/docs/0.20.0/development/extensions-core/kafka-ingestion.html">Kafka indexing service</a></td><td>Partitioning in Druid is guided by how your Kafka topic is partitioned. You can also <a href="data-management.html#compaction-and-reindexing">reindex</a> to repartition after initial ingestion.</td></tr>
+<tr><td><a href="/docs/0.20.0/development/extensions-core/kinesis-ingestion.html">Kinesis indexing service</a></td><td>Partitioning in Druid is guided by how your Kinesis stream is sharded. You can also <a href="data-management.html#compaction-and-reindexing">reindex</a> to repartition after initial ingestion.</td></tr>
+</tbody>
+</table>
+<blockquote>
+<p>Note that, of course, one way to partition data is to load it into separate datasources. This is a perfectly viable
+approach and works very well when the number of datasources does not lead to excessive per-datasource overheads. If
+you go with this approach, then you can ignore this section, since it is describing how to set up partitioning
+<em>within a single datasource</em>.</p>
+<p>For more details on splitting data up into separate datasources, and potential operational considerations, refer
+to the <a href="/docs/0.20.0/querying/multitenancy.html">Multitenancy considerations</a> page.</p>
+</blockquote>
+<p><a name="spec"></a></p>
+<h2><a class="anchor" aria-hidden="true" id="ingestion-specs"></a><a href="#ingestion-specs" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Ingestion specs</h2>
+<p>No matter what ingestion method you use, data is loaded into Druid using either one-time <a href="tasks.html">tasks</a> or
+ongoing &quot;supervisors&quot; (which run and supervise a set of tasks over time). In any case, part of the task or supervisor
+definition is an <em>ingestion spec</em>.</p>
+<p>Ingestion specs consists of three main components:</p>
+<ul>
+<li><a href="#dataschema"><code>dataSchema</code></a>, which configures the <a href="#datasource">datasource name</a>,
+<a href="#timestampspec">primary timestamp</a>, <a href="#dimensionsspec">dimensions</a>, <a href="#metricsspec">metrics</a>, and <a href="#transformspec">transforms and filters</a> (if needed).</li>
+<li><a href="#ioconfig"><code>ioConfig</code></a>, which tells Druid how to connect to the source system and how to parse data. For more information, see the
+documentation for each <a href="#ingestion-methods">ingestion method</a>.</li>
+<li><a href="#tuningconfig"><code>tuningConfig</code></a>, which controls various tuning parameters specific to each
+<a href="#ingestion-methods">ingestion method</a>.</li>
+</ul>
+<p>Example ingestion spec for task type <code>index_parallel</code> (native batch):</p>
+<pre><code class="hljs">{
+  <span class="hljs-attr">"type"</span>: <span class="hljs-string">"index_parallel"</span>,
+  <span class="hljs-attr">"spec"</span>: {
+    <span class="hljs-attr">"dataSchema"</span>: {
+      <span class="hljs-attr">"dataSource"</span>: <span class="hljs-string">"wikipedia"</span>,
+      <span class="hljs-attr">"timestampSpec"</span>: {
+        <span class="hljs-attr">"column"</span>: <span class="hljs-string">"timestamp"</span>,
+        <span class="hljs-attr">"format"</span>: <span class="hljs-string">"auto"</span>
+      },
+      <span class="hljs-attr">"dimensionsSpec"</span>: {
+        <span class="hljs-attr">"dimensions"</span>: [
+          { <span class="hljs-attr">"type"</span>: <span class="hljs-string">"string"</span>, <span class="hljs-attr">"page"</span> },
+          { <span class="hljs-attr">"type"</span>: <span class="hljs-string">"string"</span>, <span class="hljs-attr">"language"</span> },
+          { <span class="hljs-attr">"type"</span>: <span class="hljs-string">"long"</span>, <span class="hljs-attr">"name"</span>: <span class="hljs-string">"userId"</span> }
+        ]
+      },
+      <span class="hljs-attr">"metricsSpec"</span>: [
+        { <span class="hljs-attr">"type"</span>: <span class="hljs-string">"count"</span>, <span class="hljs-attr">"name"</span>: <span class="hljs-string">"count"</span> },
+        { <span class="hljs-attr">"type"</span>: <span class="hljs-string">"doubleSum"</span>, <span class="hljs-attr">"name"</span>: <span class="hljs-string">"bytes_added_sum"</span>, <span class="hljs-attr">"fieldName"</span>: <span class="hljs-string">"bytes_added"</span> },
+        { <span class="hljs-attr">"type"</span>: <span class="hljs-string">"doubleSum"</span>, <span class="hljs-attr">"name"</span>: <span class="hljs-string">"bytes_deleted_sum"</span>, <span class="hljs-attr">"fieldName"</span>: <span class="hljs-string">"bytes_deleted"</span> }
+      ],
+      <span class="hljs-attr">"granularitySpec"</span>: {
+        <span class="hljs-attr">"segmentGranularity"</span>: <span class="hljs-string">"day"</span>,
+        <span class="hljs-attr">"queryGranularity"</span>: <span class="hljs-string">"none"</span>,
+        <span class="hljs-attr">"intervals"</span>: [
+          <span class="hljs-string">"2013-08-31/2013-09-01"</span>
+        ]
+      }
+    },
+    <span class="hljs-attr">"ioConfig"</span>: {
+      <span class="hljs-attr">"type"</span>: <span class="hljs-string">"index_parallel"</span>,
+      <span class="hljs-attr">"inputSource"</span>: {
+        <span class="hljs-attr">"type"</span>: <span class="hljs-string">"local"</span>,
+        <span class="hljs-attr">"baseDir"</span>: <span class="hljs-string">"examples/indexing/"</span>,
+        <span class="hljs-attr">"filter"</span>: <span class="hljs-string">"wikipedia_data.json"</span>
+      },
+      <span class="hljs-attr">"inputFormat"</span>: {
+        <span class="hljs-attr">"type"</span>: <span class="hljs-string">"json"</span>,
+        <span class="hljs-attr">"flattenSpec"</span>: {
+          <span class="hljs-attr">"useFieldDiscovery"</span>: <span class="hljs-literal">true</span>,
+          <span class="hljs-attr">"fields"</span>: [
+            { <span class="hljs-attr">"type"</span>: <span class="hljs-string">"path"</span>, <span class="hljs-attr">"name"</span>: <span class="hljs-string">"userId"</span>, <span class="hljs-attr">"expr"</span>: <span class="hljs-string">"$.user.id"</span> }
+          ]
+        }
+      }
+    },
+    <span class="hljs-attr">"tuningConfig"</span>: {
+      <span class="hljs-attr">"type"</span>: <span class="hljs-string">"index_parallel"</span>
+    }
+  }
+}
+</code></pre>
+<p>The specific options supported by these sections will depend on the <a href="#ingestion-methods">ingestion method</a> you have chosen.
+For more examples, refer to the documentation for each ingestion method.</p>
+<p>You can also load data visually, without the need to write an ingestion spec, using the &quot;Load data&quot; functionality
+available in Druid's <a href="/docs/0.20.0/operations/druid-console.html">web console</a>. Druid's visual data loader supports
+<a href="/docs/0.20.0/development/extensions-core/kafka-ingestion.html">Kafka</a>,
+<a href="/docs/0.20.0/development/extensions-core/kinesis-ingestion.html">Kinesis</a>, and
+<a href="native-batch.html">native batch</a> mode.</p>
+<h2><a class="anchor" aria-hidden="true" id="dataschema"></a><a href="#dataschema" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a><code>dataSchema</code></h2>
+<blockquote>
+<p>The <code>dataSchema</code> spec has been changed in 0.17.0. The new spec is supported by all ingestion methods
+except for <em>Hadoop</em> ingestion. See the <a href="#legacy-dataschema-spec">Legacy <code>dataSchema</code> spec</a> for the old spec.</p>
+</blockquote>
+<p>The <code>dataSchema</code> is a holder for the following components:</p>
+<ul>
+<li><a href="#datasource">datasource name</a>, <a href="#timestampspec">primary timestamp</a>,
+<a href="#dimensionsspec">dimensions</a>, <a href="#metricsspec">metrics</a>, and
+<a href="#transformspec">transforms and filters</a> (if needed).</li>
+</ul>
+<p>An example <code>dataSchema</code> is:</p>
+<pre><code class="hljs"><span class="hljs-string">"dataSchema"</span>: {
+  <span class="hljs-string">"dataSource"</span>: <span class="hljs-string">"wikipedia"</span>,
+  <span class="hljs-string">"timestampSpec"</span>: {
+    <span class="hljs-string">"column"</span>: <span class="hljs-string">"timestamp"</span>,
+    <span class="hljs-string">"format"</span>: <span class="hljs-string">"auto"</span>
+  },
+  <span class="hljs-string">"dimensionsSpec"</span>: {
+    <span class="hljs-string">"dimensions"</span>: [
+      { <span class="hljs-string">"type"</span>: <span class="hljs-string">"string"</span>, <span class="hljs-string">"page"</span> },
+      { <span class="hljs-string">"type"</span>: <span class="hljs-string">"string"</span>, <span class="hljs-string">"language"</span> },
+      { <span class="hljs-string">"type"</span>: <span class="hljs-string">"long"</span>, <span class="hljs-string">"name"</span>: <span class="hljs-string">"userId"</span> }
+    ]
+  },
+  <span class="hljs-string">"metricsSpec"</span>: [
+    { <span class="hljs-string">"type"</span>: <span class="hljs-string">"count"</span>, <span class="hljs-string">"name"</span>: <span class="hljs-string">"count"</span> },
+    { <span class="hljs-string">"type"</span>: <span class="hljs-string">"doubleSum"</span>, <span class="hljs-string">"name"</span>: <span class="hljs-string">"bytes_added_sum"</span>, <span class="hljs-string">"fieldName"</span>: <span class="hljs-string">"bytes_added"</span> },
+    { <span class="hljs-string">"type"</span>: <span class="hljs-string">"doubleSum"</span>, <span class="hljs-string">"name"</span>: <span class="hljs-string">"bytes_deleted_sum"</span>, <span class="hljs-string">"fieldName"</span>: <span class="hljs-string">"bytes_deleted"</span> }
+  ],
+  <span class="hljs-string">"granularitySpec"</span>: {
+    <span class="hljs-string">"segmentGranularity"</span>: <span class="hljs-string">"day"</span>,
+    <span class="hljs-string">"queryGranularity"</span>: <span class="hljs-string">"none"</span>,
+    <span class="hljs-string">"intervals"</span>: [
+      <span class="hljs-string">"2013-08-31/2013-09-01"</span>
+    ]
+  }
+}
+</code></pre>
+<h3><a class="anchor" aria-hidden="true" id="datasource"></a><a href="#datasource" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a><code>dataSource</code></h3>
+<p>The <code>dataSource</code> is located in <code>dataSchema</code> → <code>dataSource</code> and is simply the name of the
+<a href="../design/architecture.html#datasources-and-segments">datasource</a> that data will be written to. An example
+<code>dataSource</code> is:</p>
+<pre><code class="hljs"><span class="hljs-string">"dataSource"</span>: <span class="hljs-string">"my-first-datasource"</span>
+</code></pre>
+<h3><a class="anchor" aria-hidden="true" id="timestampspec"></a><a href="#timestampspec" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a><code>timestampSpec</code></h3>
+<p>The <code>timestampSpec</code> is located in <code>dataSchema</code> → <code>timestampSpec</code> and is responsible for
+configuring the <a href="#primary-timestamp">primary timestamp</a>. An example <code>timestampSpec</code> is:</p>
+<pre><code class="hljs"><span class="hljs-string">"timestampSpec"</span>: {
+  <span class="hljs-string">"column"</span>: <span class="hljs-string">"timestamp"</span>,
+  <span class="hljs-string">"format"</span>: <span class="hljs-string">"auto"</span>
+}
+</code></pre>
+<blockquote>
+<p>Conceptually, after input data records are read, Druid applies ingestion spec components in a particular order:
+first <a href="/docs/0.20.0/ingestion/data-formats.html#flattenspec"><code>flattenSpec</code></a> (if any), then <a href="#timestampspec"><code>timestampSpec</code></a>, then <a href="#transformspec"><code>transformSpec</code></a>,
+and finally <a href="#dimensionsspec"><code>dimensionsSpec</code></a> and <a href="#metricsspec"><code>metricsSpec</code></a>. Keep this in mind when writing
+your ingestion spec.</p>
+</blockquote>
+<p>A <code>timestampSpec</code> can have the following components:</p>
+<table>
+<thead>
+<tr><th>Field</th><th>Description</th><th>Default</th></tr>
+</thead>
+<tbody>
+<tr><td>column</td><td>Input row field to read the primary timestamp from.<br><br>Regardless of the name of this input field, the primary timestamp will always be stored as a column named <code>__time</code> in your Druid datasource.</td><td>timestamp</td></tr>
+<tr><td>format</td><td>Timestamp format. Options are: <ul><li><code>iso</code>: ISO8601 with 'T' separator, like &quot;2000-01-01T01:02:03.456&quot;</li><li><code>posix</code>: seconds since epoch</li><li><code>millis</code>: milliseconds since epoch</li><li><code>micro</code>: microseconds since epoch</li><li><code>nano</code>: nanoseconds since epoch</li><li><code>auto</code>: automatically detects ISO (either 'T' or space separator) or millis format</li><li>any <a href="http://joda-time.sourceforge.net/apidocs/org/joda/time/format/DateTimeFormat.html">Joda DateTimeFormat string</a></li></ul></td><td>auto</td></tr>
+<tr><td>missingValue</td><td>Timestamp to use for input records that have a null or missing timestamp <code>column</code>. Should be in ISO8601 format, like <code>&quot;2000-01-01T01:02:03.456&quot;</code>, even if you have specified something else for <code>format</code>. Since Druid requires a primary timestamp, this setting can be useful for ingesting datasets that do not have any per-record timestamps at all.</td><td>none</td></tr>
+</tbody>
+</table>
+<h3><a class="anchor" aria-hidden="true" id="dimensionsspec"></a><a href="#dimensionsspec" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a><code>dimensionsSpec</code></h3>
+<p>The <code>dimensionsSpec</code> is located in <code>dataSchema</code> → <code>dimensionsSpec</code> and is responsible for
+configuring <a href="#dimensions">dimensions</a>. An example <code>dimensionsSpec</code> is:</p>
+<pre><code class="hljs"><span class="hljs-string">"dimensionsSpec"</span> : {
+  <span class="hljs-string">"dimensions"</span>: [
+    <span class="hljs-string">"page"</span>,
+    <span class="hljs-string">"language"</span>,
+    { <span class="hljs-string">"type"</span>: <span class="hljs-string">"long"</span>, <span class="hljs-string">"name"</span>: <span class="hljs-string">"userId"</span> }
+  ],
+  <span class="hljs-string">"dimensionExclusions"</span> : [],
+  <span class="hljs-string">"spatialDimensions"</span> : []
+}
+</code></pre>
+<blockquote>
+<p>Conceptually, after input data records are read, Druid applies ingestion spec components in a particular order:
+first <a href="/docs/0.20.0/ingestion/data-formats.html#flattenspec"><code>flattenSpec</code></a> (if any), then <a href="#timestampspec"><code>timestampSpec</code></a>, then <a href="#transformspec"><code>transformSpec</code></a>,
+and finally <a href="#dimensionsspec"><code>dimensionsSpec</code></a> and <a href="#metricsspec"><code>metricsSpec</code></a>. Keep this in mind when writing
+your ingestion spec.</p>
+</blockquote>
+<p>A <code>dimensionsSpec</code> can have the following components:</p>
+<table>
+<thead>
+<tr><th>Field</th><th>Description</th><th>Default</th></tr>
+</thead>
+<tbody>
+<tr><td>dimensions</td><td>A list of <a href="#dimension-objects">dimension names or objects</a>. Cannot have the same column in both <code>dimensions</code> and <code>dimensionExclusions</code>.<br><br>If this and <code>spatialDimensions</code> are both null or empty arrays, Druid will treat all non-timestamp, non-metric columns that do not appear in <code>dimensionExclusions</code> as String-typed dimension columns. See <a href="#inclusions-and-exclusions">inclusions and exclusions</a> below for details.</td><td><code>[]</code></td></tr>
+<tr><td>dimensionExclusions</td><td>The names of dimensions to exclude from ingestion. Only names are supported here, not objects.<br><br>This list is only used if the <code>dimensions</code> and <code>spatialDimensions</code> lists are both null or empty arrays; otherwise it is ignored. See <a href="#inclusions-and-exclusions">inclusions and exclusions</a> below for details.</td><td><code>[]</code></td></tr>
+<tr><td>spatialDimensions</td><td>An array of <a href="/docs/0.20.0/development/geo.html">spatial dimensions</a>.</td><td><code>[]</code></td></tr>
+</tbody>
+</table>
+<h4><a class="anchor" aria-hidden="true" id="dimension-objects"></a><a href="#dimension-objects" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Dimension objects</h4>
+<p>Each dimension in the <code>dimensions</code> list can either be a name or an object. Providing a name is equivalent to providing
+a <code>string</code> type dimension object with the given name, e.g. <code>&quot;page&quot;</code> is equivalent to <code>{&quot;name&quot;: &quot;page&quot;, &quot;type&quot;: &quot;string&quot;}</code>.</p>
+<p>Dimension objects can have the following components:</p>
+<table>
+<thead>
+<tr><th>Field</th><th>Description</th><th>Default</th></tr>
+</thead>
+<tbody>
+<tr><td>type</td><td>Either <code>string</code>, <code>long</code>, <code>float</code>, or <code>double</code>.</td><td><code>string</code></td></tr>
+<tr><td>name</td><td>The name of the dimension. This will be used as the field name to read from input records, as well as the column name stored in generated segments.<br><br>Note that you can use a <a href="#transformspec"><code>transformSpec</code></a> if you want to rename columns during ingestion time.</td><td>none (required)</td></tr>
+<tr><td>createBitmapIndex</td><td>For <code>string</code> typed dimensions, whether or not bitmap indexes should be created for the column in generated segments. Creating a bitmap index requires more storage, but speeds up certain kinds of filtering (especially equality and prefix filtering). Only supported for <code>string</code> typed dimensions.</td><td><code>true</code></td></tr>
+</tbody>
+</table>
+<h4><a class="anchor" aria-hidden="true" id="inclusions-and-exclusions"></a><a href="#inclusions-and-exclusions" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Inclusions and exclusions</h4>
+<p>Druid will interpret a <code>dimensionsSpec</code> in two possible ways: <em>normal</em> or <em>schemaless</em>.</p>
+<p>Normal interpretation occurs when either <code>dimensions</code> or <code>spatialDimensions</code> is non-empty. In this case, the combination of the two lists will be taken as the set of dimensions to be ingested, and the list of <code>dimensionExclusions</code> will be ignored.</p>
+<p>Schemaless interpretation occurs when both <code>dimensions</code> and <code>spatialDimensions</code> are empty or null. In this case, the set of dimensions is determined in the following way:</p>
+<ol>
+<li>First, start from the set of all input fields from the <a href="/docs/0.20.0/ingestion/data-formats.html"><code>inputFormat</code></a> (or the <a href="/docs/0.20.0/ingestion/data-formats.html#flattenspec"><code>flattenSpec</code></a>, if one is being used).</li>
+<li>Any field listed in <code>dimensionExclusions</code> is excluded.</li>
+<li>The field listed as <code>column</code> in the <a href="#timestampspec"><code>timestampSpec</code></a> is excluded.</li>
+<li>Any field used as an input to an aggregator from the <a href="#metricsspec">metricsSpec</a> is excluded.</li>
+<li>Any field with the same name as an aggregator from the <a href="#metricsspec">metricsSpec</a> is excluded.</li>
+<li>All other fields are ingested as <code>string</code> typed dimensions with the <a href="#dimension-objects">default settings</a>.</li>
+</ol>
+<blockquote>
+<p>Note: Fields generated by a <a href="#transformspec"><code>transformSpec</code></a> are not currently considered candidates for
+schemaless dimension interpretation.</p>
+</blockquote>
+<h3><a class="anchor" aria-hidden="true" id="metricsspec"></a><a href="#metricsspec" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a><code>metricsSpec</code></h3>
+<p>The <code>metricsSpec</code> is located in <code>dataSchema</code> → <code>metricsSpec</code> and is a list of <a href="/docs/0.20.0/querying/aggregations.html">aggregators</a>
+to apply at ingestion time. This is most useful when <a href="#rollup">rollup</a> is enabled, since it's how you configure
+ingestion-time aggregation.</p>
+<p>An example <code>metricsSpec</code> is:</p>
+<pre><code class="hljs"><span class="hljs-string">"metricsSpec"</span>: [
+  { <span class="hljs-string">"type"</span>: <span class="hljs-string">"count"</span>, <span class="hljs-string">"name"</span>: <span class="hljs-string">"count"</span> },
+  { <span class="hljs-string">"type"</span>: <span class="hljs-string">"doubleSum"</span>, <span class="hljs-string">"name"</span>: <span class="hljs-string">"bytes_added_sum"</span>, <span class="hljs-string">"fieldName"</span>: <span class="hljs-string">"bytes_added"</span> },
+  { <span class="hljs-string">"type"</span>: <span class="hljs-string">"doubleSum"</span>, <span class="hljs-string">"name"</span>: <span class="hljs-string">"bytes_deleted_sum"</span>, <span class="hljs-string">"fieldName"</span>: <span class="hljs-string">"bytes_deleted"</span> }
+]
+</code></pre>
+<blockquote>
+<p>Generally, when <a href="#rollup">rollup</a> is disabled, you should have an empty <code>metricsSpec</code> (because without rollup,
+Druid does not do any ingestion-time aggregation, so there is little reason to include an ingestion-time aggregator). However,
+in some cases, it can still make sense to define metrics: for example, if you want to create a complex column as a way of
+pre-computing part of an <a href="/docs/0.20.0/querying/aggregations.html#approximate-aggregations">approximate aggregation</a>, this can only
+be done by defining a metric in a <code>metricsSpec</code>.</p>
+</blockquote>
+<h3><a class="anchor" aria-hidden="true" id="granularityspec"></a><a href="#granularityspec" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a><code>granularitySpec</code></h3>
+<p>The <code>granularitySpec</code> is located in <code>dataSchema</code> → <code>granularitySpec</code> and is responsible for configuring
+the following operations:</p>
+<ol>
+<li>Partitioning a datasource into <a href="../design/architecture.html#datasources-and-segments">time chunks</a> (via <code>segmentGranularity</code>).</li>
+<li>Truncating the timestamp, if desired (via <code>queryGranularity</code>).</li>
+<li>Specifying which time chunks of segments should be created, for batch ingestion (via <code>intervals</code>).</li>
+<li>Specifying whether ingestion-time <a href="#rollup">rollup</a> should be used or not (via <code>rollup</code>).</li>
+</ol>
+<p>Other than <code>rollup</code>, these operations are all based on the <a href="#primary-timestamp">primary timestamp</a>.</p>
+<p>An example <code>granularitySpec</code> is:</p>
+<pre><code class="hljs"><span class="hljs-string">"granularitySpec"</span>: {
+  <span class="hljs-string">"segmentGranularity"</span>: <span class="hljs-string">"day"</span>,
+  <span class="hljs-string">"queryGranularity"</span>: <span class="hljs-string">"none"</span>,
+  <span class="hljs-string">"intervals"</span>: [
+    <span class="hljs-string">"2013-08-31/2013-09-01"</span>
+  ],
+  <span class="hljs-string">"rollup"</span>: <span class="hljs-literal">true</span>
+}
+</code></pre>
+<p>A <code>granularitySpec</code> can have the following components:</p>
+<table>
+<thead>
+<tr><th>Field</th><th>Description</th><th>Default</th></tr>
+</thead>
+<tbody>
+<tr><td>type</td><td>Either <code>uniform</code> or <code>arbitrary</code>. In most cases you want to use <code>uniform</code>.</td><td><code>uniform</code></td></tr>
+<tr><td>segmentGranularity</td><td><a href="../design/architecture.html#datasources-and-segments">Time chunking</a> granularity for this datasource. Multiple segments can be created per time chunk. For example, when set to <code>day</code>, the events of the same day fall into the same time chunk which can be optionally further partitioned into multiple segments based on other configurations and input size. Any <a href="/docs/0.20.0/querying/granularities.html">granularity</a> can be provided here. Note that all segments in the same time chunk should have the same segment granularity.<br><br>Ignored if <code>type</code> is set to <code>arbitrary</code>.</td><td><code>day</code></td></tr>
+<tr><td>queryGranularity</td><td>The resolution of timestamp storage within each segment. This must be equal to, or finer, than <code>segmentGranularity</code>. This will be the finest granularity that you can query at and still receive sensible results, but note that you can still query at anything coarser than this granularity. E.g., a value of <code>minute</code> will mean that records will be stored at minutely granularity, and can be sensibly queried at any multiple of minutes (including minutely, 5-minutely, hourly, etc).<br><br>Any <a href="/docs/0.20.0/querying/granularities.html">granularity</a> can be provided here. Use <code>none</code> to store timestamps as-is, without any truncation. Note that <code>rollup</code> will be applied if it is set even when the <code>queryGranularity</code> is set to <code>none</code>.</td><td><code>none</code></td></tr>
+<tr><td>rollup</td><td>Whether to use ingestion-time <a href="#rollup">rollup</a> or not. Note that rollup is still effective even when <code>queryGranularity</code> is set to <code>none</code>. Your data will be rolled up if they have the exactly same timestamp.</td><td><code>true</code></td></tr>
+<tr><td>intervals</td><td>A list of intervals describing what time chunks of segments should be created. If <code>type</code> is set to <code>uniform</code>, this list will be broken up and rounded-off based on the <code>segmentGranularity</code>. If <code>type</code> is set to <code>arbitrary</code>, this list will be used as-is.<br><br>If <code>null</code> or not provided, batch ingestion tasks will generally determine which time chunks to output based on what timestamps are found in the input data.<br><br>If specified, batch ingestion tasks may be able to skip a determining-partitions phase, which can result in faster ingestion. Batch ingestion tasks may also be able to request all their locks up-front instead of one by one. Batch ingestion tasks will throw away any records with timestamps outside of the specified intervals.<br><br>Ignored for any form of streaming ingestion.</td><td><code>null</code></td></tr>
+</tbody>
+</table>
+<h3><a class="anchor" aria-hidden="true" id="transformspec"></a><a href="#transformspec" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a><code>transformSpec</code></h3>
+<p>The <code>transformSpec</code> is located in <code>dataSchema</code> → <code>transformSpec</code> and is responsible for transforming and filtering
+records during ingestion time. It is optional. An example <code>transformSpec</code> is:</p>
+<pre><code class="hljs"><span class="hljs-string">"transformSpec"</span>: {
+  <span class="hljs-string">"transforms"</span>: [
+    { <span class="hljs-string">"type"</span>: <span class="hljs-string">"expression"</span>, <span class="hljs-string">"name"</span>: <span class="hljs-string">"countryUpper"</span>, <span class="hljs-string">"expression"</span>: <span class="hljs-string">"upper(country)"</span> }
+  ],
+  <span class="hljs-string">"filter"</span>: {
+    <span class="hljs-string">"type"</span>: <span class="hljs-string">"selector"</span>,
+    <span class="hljs-string">"dimension"</span>: <span class="hljs-string">"country"</span>,
+    <span class="hljs-string">"value"</span>: <span class="hljs-string">"San Serriffe"</span>
+  }
+}
+</code></pre>
+<blockquote>
+<p>Conceptually, after input data records are read, Druid applies ingestion spec components in a particular order:
+first <a href="/docs/0.20.0/ingestion/data-formats.html#flattenspec"><code>flattenSpec</code></a> (if any), then <a href="#timestampspec"><code>timestampSpec</code></a>, then <a href="#transformspec"><code>transformSpec</code></a>,
+and finally <a href="#dimensionsspec"><code>dimensionsSpec</code></a> and <a href="#metricsspec"><code>metricsSpec</code></a>. Keep this in mind when writing
+your ingestion spec.</p>
+</blockquote>
+<h4><a class="anchor" aria-hidden="true" id="transforms"></a><a href="#transforms" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Transforms</h4>
+<p>The <code>transforms</code> list allows you to specify a set of expressions to evaluate on top of input data. Each transform has a
+&quot;name&quot; which can be referred to by your <code>dimensionsSpec</code>, <code>metricsSpec</code>, etc.</p>
+<p>If a transform has the same name as a field in an input row, then it will shadow the original field. Transforms that
+shadow fields may still refer to the fields they shadow. This can be used to transform a field &quot;in-place&quot;.</p>
+<p>Transforms do have some limitations. They can only refer to fields present in the actual input rows; in particular,
+they cannot refer to other transforms. And they cannot remove fields, only add them. However, they can shadow a field
+with another field containing all nulls, which will act similarly to removing the field.</p>
+<p>Transforms can refer to the <a href="#timestampspec">timestamp</a> of an input row by referring to <code>__time</code> as part of the expression.
+They can also <em>replace</em> the timestamp if you set their &quot;name&quot; to <code>__time</code>. In both cases, <code>__time</code> should be treated as
+a millisecond timestamp (number of milliseconds since Jan 1, 1970 at midnight UTC). Transforms are applied <em>after</em> the
+<code>timestampSpec</code>.</p>
+<p>Druid currently includes one kind of built-in transform, the expression transform. It has the following syntax:</p>
+<pre><code class="hljs">{
+  <span class="hljs-attr">"type"</span>: <span class="hljs-string">"expression"</span>,
+  <span class="hljs-attr">"name"</span>: <span class="hljs-string">"&lt;output name&gt;"</span>,
+  <span class="hljs-attr">"expression"</span>: <span class="hljs-string">"&lt;expr&gt;"</span>
+}
+</code></pre>
+<p>The <code>expression</code> is a <a href="/docs/0.20.0/misc/math-expr.html">Druid query expression</a>.</p>
+<blockquote>
+<p>Conceptually, after input data records are read, Druid applies ingestion spec components in a particular order:
+first <a href="/docs/0.20.0/ingestion/data-formats.html#flattenspec"><code>flattenSpec</code></a> (if any), then <a href="#timestampspec"><code>timestampSpec</code></a>, then <a href="#transformspec"><code>transformSpec</code></a>,
+and finally <a href="#dimensionsspec"><code>dimensionsSpec</code></a> and <a href="#metricsspec"><code>metricsSpec</code></a>. Keep this in mind when writing
+your ingestion spec.</p>
+</blockquote>
+<h4><a class="anchor" aria-hidden="true" id="filter"></a><a href="#filter" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Filter</h4>
+<p>The <code>filter</code> conditionally filters input rows during ingestion. Only rows that pass the filter will be
+ingested. Any of Druid's standard <a href="/docs/0.20.0/querying/filters.html">query filters</a> can be used. Note that within a
+<code>transformSpec</code>, the <code>transforms</code> are applied before the <code>filter</code>, so the filter can refer to a transform.</p>
+<h3><a class="anchor" aria-hidden="true" id="legacy-dataschema-spec"></a><a href="#legacy-dataschema-spec" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Legacy <code>dataSchema</code> spec</h3>
+<blockquote>
+<p>The <code>dataSchema</code> spec has been changed in 0.17.0. The new spec is supported by all ingestion methods
+except for <em>Hadoop</em> ingestion. See <a href="#dataschema"><code>dataSchema</code></a> for the new spec.</p>
+</blockquote>
+<p>The legacy <code>dataSchema</code> spec has below two more components in addition to the ones listed in the <a href="#dataschema"><code>dataSchema</code></a> section above.</p>
+<ul>
+<li><a href="#parser-deprecated">input row parser</a>, <a href="#flattenspec">flattening of nested data</a> (if needed)</li>
+</ul>
+<h4><a class="anchor" aria-hidden="true" id="parser-deprecated"></a><a href="#parser-deprecated" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a><code>parser</code> (Deprecated)</h4>
+<p>In legacy <code>dataSchema</code>, the <code>parser</code> is located in the <code>dataSchema</code> → <code>parser</code> and is responsible for configuring a wide variety of
+items related to parsing input records. The <code>parser</code> is deprecated and it is highly recommended to use <code>inputFormat</code> instead.
+For details about <code>inputFormat</code> and supported <code>parser</code> types, see the <a href="/docs/0.20.0/ingestion/data-formats.html">&quot;Data formats&quot; page</a>.</p>
+<p>For details about major components of the <code>parseSpec</code>, refer to their subsections:</p>
+<ul>
+<li><a href="#timestampspec"><code>timestampSpec</code></a>, responsible for configuring the <a href="#primary-timestamp">primary timestamp</a>.</li>
+<li><a href="#dimensionsspec"><code>dimensionsSpec</code></a>, responsible for configuring <a href="#dimensions">dimensions</a>.</li>
+<li><a href="#flattenspec"><code>flattenSpec</code></a>, responsible for flattening nested data formats.</li>
+</ul>
+<p>An example <code>parser</code> is:</p>
+<pre><code class="hljs"><span class="hljs-string">"parser"</span>: {
+  <span class="hljs-string">"type"</span>: <span class="hljs-string">"string"</span>,
+  <span class="hljs-string">"parseSpec"</span>: {
+    <span class="hljs-string">"format"</span>: <span class="hljs-string">"json"</span>,
+    <span class="hljs-string">"flattenSpec"</span>: {
+      <span class="hljs-string">"useFieldDiscovery"</span>: true,
+      <span class="hljs-string">"fields"</span>: [
+        { <span class="hljs-string">"type"</span>: <span class="hljs-string">"path"</span>, <span class="hljs-string">"name"</span>: <span class="hljs-string">"userId"</span>, <span class="hljs-string">"expr"</span>: <span class="hljs-string">"$.user.id"</span> }
+      ]
+    },
+    <span class="hljs-string">"timestampSpec"</span>: {
+      <span class="hljs-string">"column"</span>: <span class="hljs-string">"timestamp"</span>,
+      <span class="hljs-string">"format"</span>: <span class="hljs-string">"auto"</span>
+    },
+    <span class="hljs-string">"dimensionsSpec"</span>: {
+      <span class="hljs-string">"dimensions"</span>: [
+        { <span class="hljs-string">"type"</span>: <span class="hljs-string">"string"</span>, <span class="hljs-string">"page"</span> },
+        { <span class="hljs-string">"type"</span>: <span class="hljs-string">"string"</span>, <span class="hljs-string">"language"</span> },
+        { <span class="hljs-string">"type"</span>: <span class="hljs-string">"long"</span>, <span class="hljs-string">"name"</span>: <span class="hljs-string">"userId"</span> }
+      ]
+    }
+  }
+}
+</code></pre>
+<h4><a class="anchor" aria-hidden="true" id="flattenspec"></a><a href="#flattenspec" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a><code>flattenSpec</code></h4>
+<p>In the legacy <code>dataSchema</code>, the <code>flattenSpec</code> is located in <code>dataSchema</code> → <code>parser</code> → <code>parseSpec</code> → <code>flattenSpec</code> and is responsible for
+bridging the gap between potentially nested input data (such as JSON, Avro, etc) and Druid's flat data model.
+See <a href="/docs/0.20.0/ingestion/data-formats.html#flattenspec">Flatten spec</a> for more details.</p>
+<h2><a class="anchor" aria-hidden="true" id="ioconfig"></a><a href="#ioconfig" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a><code>ioConfig</code></h2>
+<p>The <code>ioConfig</code> influences how data is read from a source system, such as Apache Kafka, Amazon S3, a mounted
+filesystem, or any other supported source system. The <code>inputFormat</code> property applies to all
+<a href="#ingestion-methods">ingestion method</a> except for Hadoop ingestion. The Hadoop ingestion still
+uses the <a href="#parser-deprecated"><code>parser</code></a> in the legacy <code>dataSchema</code>.
+The rest of <code>ioConfig</code> is specific to each individual ingestion method.
+An example <code>ioConfig</code> to read JSON data is:</p>
+<pre><code class="hljs css language-json">"ioConfig": {
+    "type": "&lt;ingestion-method-specific type code&gt;",
+    "inputFormat": {
+      "type": "json"
+    },
+    ...
+}
+</code></pre>
+<p>For more details, see the documentation provided by each <a href="#ingestion-methods">ingestion method</a>.</p>
+<h2><a class="anchor" aria-hidden="true" id="tuningconfig"></a><a href="#tuningconfig" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a><code>tuningConfig</code></h2>
+<p>Tuning properties are specified in a <code>tuningConfig</code>, which goes at the top level of an ingestion spec. Some
+properties apply to all <a href="#ingestion-methods">ingestion methods</a>, but most are specific to each individual
+ingestion method. An example <code>tuningConfig</code> that sets all of the shared, common properties to their defaults
+is:</p>
+<pre><code class="hljs css language-plaintext">"tuningConfig": {
+  "type": "&lt;ingestion-method-specific type code&gt;",
+  "maxRowsInMemory": 1000000,
+  "maxBytesInMemory": &lt;one-sixth of JVM memory&gt;,
+  "indexSpec": {
+    "bitmap": { "type": "roaring" },
+    "dimensionCompression": "lz4",
+    "metricCompression": "lz4",
+    "longEncoding": "longs"
+  },
+  &lt;other ingestion-method-specific properties&gt;
+}
+</code></pre>
+<table>
+<thead>
+<tr><th>Field</th><th>Description</th><th>Default</th></tr>
+</thead>
+<tbody>
+<tr><td>type</td><td>Each ingestion method has its own tuning type code. You must specify the type code that matches your ingestion method. Common options are <code>index</code>, <code>hadoop</code>, <code>kafka</code>, and <code>kinesis</code>.</td><td></td></tr>
+<tr><td>maxRowsInMemory</td><td>The maximum number of records to store in memory before persisting to disk. Note that this is the number of rows post-rollup, and so it may not be equal to the number of input records. Ingested records will be persisted to disk when either <code>maxRowsInMemory</code> or <code>maxBytesInMemory</code> are reached (whichever happens first).</td><td><code>1000000</code></td></tr>
+<tr><td>maxBytesInMemory</td><td>The maximum aggregate size of records, in bytes, to store in the JVM heap before persisting. This is based on a rough estimate of memory usage. Ingested records will be persisted to disk when either <code>maxRowsInMemory</code> or <code>maxBytesInMemory</code> are reached (whichever happens first).<br /><br />Setting maxBytesInMemory to -1 disables this check, meaning Druid will rely entirely on maxRowsInMemory to control memory usage. Setting it to zero means the default value will be used (one-sixth of JVM heap size).<br /><br />Note that the estimate of memory usage is designed to be an overestimate, and can be especially high when using complex ingest-time aggregators, including sketches. If this causes your indexing workloads to persist to disk too often, you can set maxBytesInMemory to -1 and rely on maxRowsInMemory instead.</td><td>One-sixth of max JVM heap size</td></tr>
+<tr><td>indexSpec</td><td>Tune how data is indexed. See below for more information.</td><td>See table below</td></tr>
+<tr><td>Other properties</td><td>Each ingestion method has its own list of additional tuning properties. See the documentation for each method for a full list: <a href="/docs/0.20.0/development/extensions-core/kafka-ingestion.html#tuningconfig">Kafka indexing service</a>, <a href="/docs/0.20.0/development/extensions-core/kinesis-ingestion.html#tuningconfig">Kinesis indexing service</a>, <a href="/docs/0.20.0/ingestion/native-batch.html#tuningconfig">Native batch</a>, and <a href="/docs/0.20.0/ingestion/hadoop.html#tuningconfig">Hadoop-based</a>.</td><td></td></tr>
+</tbody>
+</table>
+<h4><a class="anchor" aria-hidden="true" id="indexspec"></a><a href="#indexspec" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a><code>indexSpec</code></h4>
+<p>The <code>indexSpec</code> object can include the following properties:</p>
+<table>
+<thead>
+<tr><th>Field</th><th>Description</th><th>Default</th></tr>
+</thead>
+<tbody>
+<tr><td>bitmap</td><td>Compression format for bitmap indexes. Should be a JSON object with <code>type</code> set to <code>roaring</code> or <code>concise</code>. For type <code>roaring</code>, the boolean property <code>compressRunOnSerialization</code> (defaults to true) controls whether or not run-length encoding will be used when it is determined to be more space-efficient.</td><td><code>{&quot;type&quot;: &quot;concise&quot;}</code></td></tr>
+<tr><td>dimensionCompression</td><td>Compression format for dimension columns. Options are <code>lz4</code>, <code>lzf</code>, or <code>uncompressed</code>.</td><td><code>lz4</code></td></tr>
+<tr><td>metricCompression</td><td>Compression format for primitive type metric columns. Options are <code>lz4</code>, <code>lzf</code>, <code>uncompressed</code>, or <code>none</code> (which is more efficient than <code>uncompressed</code>, but not supported by older versions of Druid).</td><td><code>lz4</code></td></tr>
+<tr><td>longEncoding</td><td>Encoding format for long-typed columns. Applies regardless of whether they are dimensions or metrics. Options are <code>auto</code> or <code>longs</code>. <code>auto</code> encodes the values using offset or lookup table depending on column cardinality, and store them with variable size. <code>longs</code> stores the value as-is with 8 bytes each.</td><td><code>longs</code></td></tr>
+</tbody>
+</table>
+<p>Beyond these properties, each ingestion method has its own specific tuning properties. See the documentation for each
+<a href="#ingestion-methods">ingestion method</a> for details.</p>
+</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/0.20.0/dependencies/zookeeper.html"><span class="arrow-prev">← </span><span class="function-name-prevnext">ZooKeeper</span></a><a class="docs-next button" href="/docs/0.20.0/ingestion/data-formats.html"><span>Data formats</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#overview">Overview</a></li><li><a href="#how-to-use-this-documentation">How to use this documentation</a></li><li><a href="#ingestion-methods">Ingestion methods</a><ul class="toc-headings"><li><a href="#streaming">Streaming</a></li><li><a href="#batch">Batch</a></li></ul></li><li><a href="#druids-data-model">Druid's data model</a><ul class="toc-headings"><li><a href="#datasources">Datasources</a></li><li><a href="#primary-timestamp">Primary timestamp</a></li><li><a href="#dimensions">Dimensions</a></li><li><a href="#metrics">Metrics</a></li></ul></li><li><a href="#rollup">Rollup</a><ul class="toc-headings"><li><a href="#what-is-rollup">What is rollup?</a></li><li><a href="#enabling-or-disabling-rollup">Enabling or disabling rollup</a></li><li><a href="#example-of-rollup">Example of rollup</a></li><li><a href="#maximizing-rollup-ratio">Maximizing rollup ratio</a></li><li><a href="#perfect-rollup-vs-best-effort-rollup">Perfect rollup vs Best-effort rollup</a></li></ul></li><li><a href="#partitioning">Partitioning</a><ul class="toc-headings"><li><a href="#why-partition">Why partition?</a></li><li><a href="#how-to-set-up-partitioning">How to set up partitioning</a></li></ul></li><li><a href="#ingestion-specs">Ingestion specs</a></li><li><a href="#dataschema"><code>dataSchema</code></a><ul class="toc-headings"><li><a href="#datasource"><code>dataSource</code></a></li><li><a href="#timestampspec"><code>timestampSpec</code></a></li><li><a href="#dimensionsspec"><code>dimensionsSpec</code></a></li><li><a href="#metricsspec"><code>metricsSpec</code></a></li><li><a href="#granularityspec"><code>granularitySpec</code></a></li><li><a href="#transformspec"><code>transformSpec</code></a></li><li><a href="#legacy-dataschema-spec">Legacy <code>dataSchema</code> spec</a></li></ul></li><li><a href="#ioconfig"><code>ioConfig</code></a></li><li><a href="#tuningconfig"><code>tuningConfig</code></a></li></ul></nav></div><footer class="nav-footer druid-footer" id="footer"><div class="container"><div class="text-center"><p><a href="/technology">Technology</a> · <a href="/use-cases">Use Cases</a> · <a href="/druid-powered">Powered by Druid</a> · <a href="/docs/0.20.0/latest">Docs</a> · <a href="/community/">Community</a> · <a href="/downloads.html">Download</a> · <a href="/faq">FAQ</a></p></div><div class="text-center"><a title="Join the user group" href="https://groups.google.com/forum/#!forum/druid-user" target="_blank"><span class="fa fa-comments"></span></a> · <a title="Follow Druid" href="https://twitter.com/druidio" target="_blank"><span class="fab fa-twitter"></span></a> · <a title="Download via Apache" href="https://www.apache.org/dyn/closer.cgi?path=/incubator/druid/{{ site.druid_versions[0].versions[0].version }}/apache-druid-{{ site.druid_versions[0].versions[0].version }}-bin.tar.gz" target="_blank"><span class="fas fa-feather"></span></a> · <a title="GitHub" href="https://github.com/apache/druid" target="_blank"><span class="fab fa-github"></span></a></div><div class="text-center license">Copyright © 2019 <a href="https://www.apache.org/" target="_blank">Apache Software Foundation</a>.<br/>Except where otherwise noted, licensed under <a rel="license" href="http://creativecommons.org/licenses/by-sa/4.0/">CC BY-SA 4.0</a>.<br/>Apache Druid, Druid, and the Druid logo are either registered trademarks or trademarks of The Apache Software Foundation in the United States and other countries.</div></div></footer></div><script type="text/javascript" src="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.js"></script><script>
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+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Native batch ingestion · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/0.20.0/ingestion/native-batch.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.20.0" /><meta property="og:title" content="Native batch ingestion · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
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class="icon-toc"></i></div></div><div class="navGroups"><div class="navGroup"><h3 class="navGroupCategoryTitle collapsible">Getting started<span class="arrow"><svg width="24" height="24" viewBox="0 0 24 24"><path fill="#565656" d="M7.41 15.41L12 10.83l4.59 4.58L18 14l-6-6-6 6z"></path><path d="M0 0h24v24H0z" fill="none"></path></svg></span></h3><ul class="hide"><li class="navListItem"><a class="navItem" href="/docs/0.20.0/design/index.html">Introduction to Apache Druid</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/tutorials/index.html">Quickstart</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/tutorials/docker.html">Docker</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/operations/single-server.html">Single server deployment</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/tutorials/cluster.html">Clustered deployment</a></li></ul></div><div class="navGroup"><h3 class="navGroupCategoryTitle 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+        </script></nav></div><div class="container mainContainer docsContainer"><div class="wrapper"><div class="post"><header class="postHeader"><a class="edit-page-link button" href="https://github.com/apache/druid/edit/master/docs/ingestion/native-batch.md" target="_blank" rel="noreferrer noopener">Edit</a><h1 id="__docusaurus" class="postHeaderTitle">Native batch ingestion</h1></header><article><div><span><!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
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+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+  -->
+<p>Apache Druid currently has two types of native batch indexing tasks, <code>index_parallel</code> which can run
+multiple tasks in parallel, and <code>index</code> which will run a single indexing task. Please refer to our
+<a href="/docs/0.20.0/ingestion/index.html#batch">Hadoop-based vs. native batch comparison table</a> for comparisons between Hadoop-based, native batch
+(simple), and native batch (parallel) ingestion.</p>
+<p>To run either kind of native batch indexing task, write an ingestion spec as specified below. Then POST it to the
+<a href="/docs/0.20.0/operations/api-reference.html#tasks"><code>/druid/indexer/v1/task</code></a> endpoint on the Overlord, or use the
+<code>bin/post-index-task</code> script included with Druid.</p>
+<h2><a class="anchor" aria-hidden="true" id="tutorial"></a><a href="#tutorial" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Tutorial</h2>
+<p>This page contains reference documentation for native batch ingestion.
+For a walk-through instead, check out the <a href="/docs/0.20.0/tutorials/tutorial-batch.html">Loading a file</a> tutorial, which
+demonstrates the &quot;simple&quot; (single-task) mode.</p>
+<h2><a class="anchor" aria-hidden="true" id="parallel-task"></a><a href="#parallel-task" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Parallel task</h2>
+<p>The Parallel task (type <code>index_parallel</code>) is a task for parallel batch indexing. This task only uses Druid's resource and
+doesn't depend on other external systems like Hadoop. The <code>index_parallel</code> task is a supervisor task that orchestrates
+the whole indexing process. The supervisor task splits the input data and creates worker tasks to process those splits.
+The created worker tasks are issued to the Overlord so that they can be scheduled and run on MiddleManagers or Indexers.
+Once a worker task successfully processes the assigned input split, it reports the generated segment list to the supervisor task.
+The supervisor task periodically checks the status of worker tasks. If one of them fails, it retries the failed task
+until the number of retries reaches the configured limit. If all worker tasks succeed, it publishes the reported segments at once and finalizes ingestion.</p>
+<p>The detailed behavior of the Parallel task is different depending on the <a href="#partitionsspec"><code>partitionsSpec</code></a>.
+See each <code>partitionsSpec</code> for more details.</p>
+<p>To use this task, the <a href="#input-sources"><code>inputSource</code></a> in the <code>ioConfig</code> should be <em>splittable</em> and <code>maxNumConcurrentSubTasks</code> should be set to larger than 1 in the <code>tuningConfig</code>.
+Otherwise, this task runs sequentially; the <code>index_parallel</code> task reads each input file one by one and creates segments by itself.
+The supported splittable input formats for now are:</p>
+<ul>
+<li><a href="#s3-input-source"><code>s3</code></a> reads data from AWS S3 storage.</li>
+<li><a href="#google-cloud-storage-input-source"><code>gs</code></a> reads data from Google Cloud Storage.</li>
+<li><a href="#azure-input-source"><code>azure</code></a> reads data from Azure Blob Storage.</li>
+<li><a href="#hdfs-input-source"><code>hdfs</code></a> reads data from HDFS storage.</li>
+<li><a href="#http-input-source"><code>http</code></a> reads data from HTTP servers.</li>
+<li><a href="#local-input-source"><code>local</code></a> reads data from local storage.</li>
+<li><a href="#druid-input-source"><code>druid</code></a> reads data from a Druid datasource.</li>
+<li><a href="#sql-input-source"><code>sql</code></a> reads data from a RDBMS source.</li>
+</ul>
+<p>Some other cloud storage types are supported with the legacy <a href="#firehoses-deprecated"><code>firehose</code></a>.
+The below <code>firehose</code> types are also splittable. Note that only text formats are supported
+with the <code>firehose</code>.</p>
+<h3><a class="anchor" aria-hidden="true" id="compression-formats-supported"></a><a href="#compression-formats-supported" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Compression formats supported</h3>
+<p>The supported compression formats for native batch ingestion are <code>bz2</code>, <code>gz</code>, <code>xz</code>, <code>zip</code>, <code>sz</code> (Snappy), and <code>zst</code> (ZSTD).</p>
+<ul>
+<li><a href="/docs/0.20.0/development/extensions-contrib/cloudfiles.html#firehose"><code>static-cloudfiles</code></a></li>
+</ul>
+<p>You may want to consider the below things:</p>
+<ul>
+<li>You may want to control the amount of input data each worker task processes. This can be
+controlled using different configurations depending on the phase in parallel ingestion (see <a href="#partitionsspec"><code>partitionsSpec</code></a> for more details).
+For the tasks that read data from the <code>inputSource</code>, you can set the <a href="#split-hint-spec">Split hint spec</a> in the <code>tuningConfig</code>.
+For the tasks that merge shuffled segments, you can set the <code>totalNumMergeTasks</code> in the <code>tuningConfig</code>.</li>
+<li>The number of concurrent worker tasks in parallel ingestion is determined by <code>maxNumConcurrentSubTasks</code> in the <code>tuningConfig</code>.
+The supervisor task checks the number of current running worker tasks and creates more if it's smaller than <code>maxNumConcurrentSubTasks</code>
+no matter how many task slots are currently available.
+This may affect to other ingestion performance. See the below <a href="#capacity-planning">Capacity Planning</a> section for more details.</li>
+<li>By default, batch ingestion replaces all data (in your <code>granularitySpec</code>'s intervals) in any segment that it writes to.
+If you'd like to add to the segment instead, set the <code>appendToExisting</code> flag in the <code>ioConfig</code>. Note that it only replaces
+data in segments where it actively adds data: if there are segments in your <code>granularitySpec</code>'s intervals that have
+no data written by this task, they will be left alone. If any existing segments partially overlap with the
+<code>granularitySpec</code>'s intervals, the portion of those segments outside the new segments' intervals will still be visible.</li>
+</ul>
+<h3><a class="anchor" aria-hidden="true" id="task-syntax"></a><a href="#task-syntax" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Task syntax</h3>
+<p>A sample task is shown below:</p>
+<pre><code class="hljs css language-json">{
+  <span class="hljs-attr">"type"</span>: <span class="hljs-string">"index_parallel"</span>,
+  <span class="hljs-attr">"spec"</span>: {
+    <span class="hljs-attr">"dataSchema"</span>: {
+      <span class="hljs-attr">"dataSource"</span>: <span class="hljs-string">"wikipedia_parallel_index_test"</span>,
+      <span class="hljs-attr">"timestampSpec"</span>: {
+        <span class="hljs-attr">"column"</span>: <span class="hljs-string">"timestamp"</span>
+      },
+      <span class="hljs-attr">"dimensionsSpec"</span>: {
+        <span class="hljs-attr">"dimensions"</span>: [
+          <span class="hljs-string">"page"</span>,
+          <span class="hljs-string">"language"</span>,
+          <span class="hljs-string">"user"</span>,
+          <span class="hljs-string">"unpatrolled"</span>,
+          <span class="hljs-string">"newPage"</span>,
+          <span class="hljs-string">"robot"</span>,
+          <span class="hljs-string">"anonymous"</span>,
+          <span class="hljs-string">"namespace"</span>,
+          <span class="hljs-string">"continent"</span>,
+          <span class="hljs-string">"country"</span>,
+          <span class="hljs-string">"region"</span>,
+          <span class="hljs-string">"city"</span>
+        ]
+      },
+      <span class="hljs-attr">"metricsSpec"</span>: [
+        {
+          <span class="hljs-attr">"type"</span>: <span class="hljs-string">"count"</span>,
+              <span class="hljs-attr">"name"</span>: <span class="hljs-string">"count"</span>
+            },
+            {
+              <span class="hljs-attr">"type"</span>: <span class="hljs-string">"doubleSum"</span>,
+              <span class="hljs-attr">"name"</span>: <span class="hljs-string">"added"</span>,
+              <span class="hljs-attr">"fieldName"</span>: <span class="hljs-string">"added"</span>
+            },
+            {
+              <span class="hljs-attr">"type"</span>: <span class="hljs-string">"doubleSum"</span>,
+              <span class="hljs-attr">"name"</span>: <span class="hljs-string">"deleted"</span>,
+              <span class="hljs-attr">"fieldName"</span>: <span class="hljs-string">"deleted"</span>
+            },
+            {
+              <span class="hljs-attr">"type"</span>: <span class="hljs-string">"doubleSum"</span>,
+              <span class="hljs-attr">"name"</span>: <span class="hljs-string">"delta"</span>,
+              <span class="hljs-attr">"fieldName"</span>: <span class="hljs-string">"delta"</span>
+            }
+        ],
+        <span class="hljs-attr">"granularitySpec"</span>: {
+          <span class="hljs-attr">"segmentGranularity"</span>: <span class="hljs-string">"DAY"</span>,
+          <span class="hljs-attr">"queryGranularity"</span>: <span class="hljs-string">"second"</span>,
+          <span class="hljs-attr">"intervals"</span> : [ <span class="hljs-string">"2013-08-31/2013-09-02"</span> ]
+        }
+    },
+    <span class="hljs-attr">"ioConfig"</span>: {
+        <span class="hljs-attr">"type"</span>: <span class="hljs-string">"index_parallel"</span>,
+        <span class="hljs-attr">"inputSource"</span>: {
+          <span class="hljs-attr">"type"</span>: <span class="hljs-string">"local"</span>,
+          <span class="hljs-attr">"baseDir"</span>: <span class="hljs-string">"examples/indexing/"</span>,
+          <span class="hljs-attr">"filter"</span>: <span class="hljs-string">"wikipedia_index_data*"</span>
+        },
+        <span class="hljs-attr">"inputFormat"</span>: {
+          <span class="hljs-attr">"type"</span>: <span class="hljs-string">"json"</span>
+        }
+    },
+    <span class="hljs-attr">"tuningconfig"</span>: {
+        <span class="hljs-attr">"type"</span>: <span class="hljs-string">"index_parallel"</span>,
+        <span class="hljs-attr">"maxNumConcurrentSubTasks"</span>: <span class="hljs-number">2</span>
+    }
+  }
+}
+</code></pre>
+<table>
+<thead>
+<tr><th>property</th><th>description</th><th>required?</th></tr>
+</thead>
+<tbody>
+<tr><td>type</td><td>The task type, this should always be <code>index_parallel</code>.</td><td>yes</td></tr>
+<tr><td>id</td><td>The task ID. If this is not explicitly specified, Druid generates the task ID using task type, data source name, interval, and date-time stamp.</td><td>no</td></tr>
+<tr><td>spec</td><td>The ingestion spec including the data schema, IOConfig, and TuningConfig. See below for more details.</td><td>yes</td></tr>
+<tr><td>context</td><td>Context containing various task configuration parameters. See below for more details.</td><td>no</td></tr>
+</tbody>
+</table>
+<h3><a class="anchor" aria-hidden="true" id="dataschema"></a><a href="#dataschema" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a><code>dataSchema</code></h3>
+<p>This field is required.</p>
+<p>See <a href="/docs/0.20.0/ingestion/index.html#dataschema">Ingestion Spec DataSchema</a></p>
+<p>If you specify <code>intervals</code> explicitly in your dataSchema's <code>granularitySpec</code>, batch ingestion will lock the full intervals
+specified when it starts up, and you will learn quickly if the specified interval overlaps with locks held by other
+tasks (e.g., Kafka ingestion). Otherwise, batch ingestion will lock each interval as it is discovered, so you may only
+learn that the task overlaps with a higher-priority task later in ingestion.  If you specify <code>intervals</code> explicitly, any
+rows outside the specified intervals will be thrown away. We recommend setting <code>intervals</code> explicitly if you know the
+time range of the data so that locking failure happens faster, and so that you don't accidentally replace data outside
+that range if there's some stray data with unexpected timestamps.</p>
+<h3><a class="anchor" aria-hidden="true" id="ioconfig"></a><a href="#ioconfig" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a><code>ioConfig</code></h3>
+<table>
+<thead>
+<tr><th>property</th><th>description</th><th>default</th><th>required?</th></tr>
+</thead>
+<tbody>
+<tr><td>type</td><td>The task type, this should always be <code>index_parallel</code>.</td><td>none</td><td>yes</td></tr>
+<tr><td>inputFormat</td><td><a href="/docs/0.20.0/ingestion/data-formats.html#input-format"><code>inputFormat</code></a> to specify how to parse input data.</td><td>none</td><td>yes</td></tr>
+<tr><td>appendToExisting</td><td>Creates segments as additional shards of the latest version, effectively appending to the segment set instead of replacing it. The current limitation is that you can append to any datasources regardless of their original partitioning scheme, but the appended segments should be partitioned using the <code>dynamic</code> partitionsSpec.</td><td>false</td><td>no</td></tr>
+</tbody>
+</table>
+<h3><a class="anchor" aria-hidden="true" id="tuningconfig"></a><a href="#tuningconfig" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a><code>tuningConfig</code></h3>
+<p>The tuningConfig is optional and default parameters will be used if no tuningConfig is specified. See below for more details.</p>
+<table>
+<thead>
+<tr><th>property</th><th>description</th><th>default</th><th>required?</th></tr>
+</thead>
+<tbody>
+<tr><td>type</td><td>The task type, this should always be <code>index_parallel</code>.</td><td>none</td><td>yes</td></tr>
+<tr><td>maxRowsPerSegment</td><td>Deprecated. Use <code>partitionsSpec</code> instead. Used in sharding. Determines how many rows are in each segment.</td><td>5000000</td><td>no</td></tr>
+<tr><td>maxRowsInMemory</td><td>Used in determining when intermediate persists to disk should occur. Normally user does not need to set this, but depending on the nature of data, if rows are short in terms of bytes, user may not want to store a million rows in memory and this value should be set.</td><td>1000000</td><td>no</td></tr>
+<tr><td>maxBytesInMemory</td><td>Used in determining when intermediate persists to disk should occur. Normally this is computed internally and user does not need to set it. This value represents number of bytes to aggregate in heap memory before persisting. This is based on a rough estimate of memory usage and not actual usage. The maximum heap memory usage for indexing is maxBytesInMemory * (2 + maxPendingPersists)</td><td>1/6 of max JVM memory</td><td>no</td></tr>
+<tr><td>maxTotalRows</td><td>Deprecated. Use <code>partitionsSpec</code> instead. Total number of rows in segments waiting for being pushed. Used in determining when intermediate pushing should occur.</td><td>20000000</td><td>no</td></tr>
+<tr><td>numShards</td><td>Deprecated. Use <code>partitionsSpec</code> instead. Directly specify the number of shards to create when using a <code>hashed</code> <code>partitionsSpec</code>. If this is specified and <code>intervals</code> is specified in the <code>granularitySpec</code>, the index task can skip the determine intervals/partitions pass through the data. <code>numShards</code> cannot be specified if <code>maxRowsPerSegment</code> is set.</td><td>null</td><td>no</td></tr>
+<tr><td>splitHintSpec</td><td>Used to give a hint to control the amount of data that each first phase task reads. This hint could be ignored depending on the implementation of the input source. See <a href="#split-hint-spec">Split hint spec</a> for more details.</td><td>size-based split hint spec</td><td>no</td></tr>
+<tr><td>partitionsSpec</td><td>Defines how to partition data in each timeChunk, see <a href="#partitionsspec">PartitionsSpec</a></td><td><code>dynamic</code> if <code>forceGuaranteedRollup</code> = false, <code>hashed</code> or <code>single_dim</code> if <code>forceGuaranteedRollup</code> = true</td><td>no</td></tr>
+<tr><td>indexSpec</td><td>Defines segment storage format options to be used at indexing time, see <a href="/docs/0.20.0/ingestion/index.html#indexspec">IndexSpec</a></td><td>null</td><td>no</td></tr>
+<tr><td>indexSpecForIntermediatePersists</td><td>Defines segment storage format options to be used at indexing time for intermediate persisted temporary segments. this can be used to disable dimension/metric compression on intermediate segments to reduce memory required for final merging. however, disabling compression on intermediate segments might increase page cache use while they are used before getting merged into final segment published, see <a href="/docs/0.20.0/ingestion/index.html#indexspec">IndexSpec</a> for possible values.</td><td>same as indexSpec</td><td>no</td></tr>
+<tr><td>maxPendingPersists</td><td>Maximum number of persists that can be pending but not started. If this limit would be exceeded by a new intermediate persist, ingestion will block until the currently-running persist finishes. Maximum heap memory usage for indexing scales with maxRowsInMemory * (2 + maxPendingPersists).</td><td>0 (meaning one persist can be running concurrently with ingestion, and none can be queued up)</td><td>no</td></tr>
+<tr><td>forceGuaranteedRollup</td><td>Forces guaranteeing the <a href="/docs/0.20.0/ingestion/index.html#rollup">perfect rollup</a>. The perfect rollup optimizes the total size of generated segments and querying time while indexing time will be increased. If this is set to true, <code>intervals</code> in <code>granularitySpec</code> must be set and <code>hashed</code> or <code>single_dim</code> must be used for <code>partitionsSpec</code>. This flag cannot be used with <code>appendToExisting</code> of IOConfig. For more details, see the below <strong>Segment pushing modes</strong> section.</td><td>false</td><td>no</td></tr>
+<tr><td>reportParseExceptions</td><td>If true, exceptions encountered during parsing will be thrown and will halt ingestion; if false, unparseable rows and fields will be skipped.</td><td>false</td><td>no</td></tr>
+<tr><td>pushTimeout</td><td>Milliseconds to wait for pushing segments. It must be &gt;= 0, where 0 means to wait forever.</td><td>0</td><td>no</td></tr>
+<tr><td>segmentWriteOutMediumFactory</td><td>Segment write-out medium to use when creating segments. See <a href="#segmentwriteoutmediumfactory">SegmentWriteOutMediumFactory</a>.</td><td>Not specified, the value from <code>druid.peon.defaultSegmentWriteOutMediumFactory.type</code> is used</td><td>no</td></tr>
+<tr><td>maxNumConcurrentSubTasks</td><td>Maximum number of worker tasks which can be run in parallel at the same time. The supervisor task would spawn worker tasks up to <code>maxNumConcurrentSubTasks</code> regardless of the current available task slots. If this value is set to 1, the supervisor task processes data ingestion on its own instead of spawning worker tasks. If this value is set to too large, too many worker tasks can be created which might block other ingestion. Check <a href="#capacity-planning">Capacity Planning</a> for more details.</td><td>1</td><td>no</td></tr>
+<tr><td>maxRetry</td><td>Maximum number of retries on task failures.</td><td>3</td><td>no</td></tr>
+<tr><td>maxNumSegmentsToMerge</td><td>Max limit for the number of segments that a single task can merge at the same time in the second phase. Used only <code>forceGuaranteedRollup</code> is set.</td><td>100</td><td>no</td></tr>
+<tr><td>totalNumMergeTasks</td><td>Total number of tasks to merge segments in the merge phase when <code>partitionsSpec</code> is set to <code>hashed</code> or <code>single_dim</code>.</td><td>10</td><td>no</td></tr>
+<tr><td>taskStatusCheckPeriodMs</td><td>Polling period in milliseconds to check running task statuses.</td><td>1000</td><td>no</td></tr>
+<tr><td>chatHandlerTimeout</td><td>Timeout for reporting the pushed segments in worker tasks.</td><td>PT10S</td><td>no</td></tr>
+<tr><td>chatHandlerNumRetries</td><td>Retries for reporting the pushed segments in worker tasks.</td><td>5</td><td>no</td></tr>
+</tbody>
+</table>
+<h3><a class="anchor" aria-hidden="true" id="split-hint-spec"></a><a href="#split-hint-spec" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Split Hint Spec</h3>
+<p>The split hint spec is used to give a hint when the supervisor task creates input splits.
+Note that each worker task processes a single input split. You can control the amount of data each worker task will read during the first phase.</p>
+<h4><a class="anchor" aria-hidden="true" id="size-based-split-hint-spec"></a><a href="#size-based-split-hint-spec" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Size-based Split Hint Spec</h4>
+<p>The size-based split hint spec is respected by all splittable input sources except for the HTTP input source.</p>
+<table>
+<thead>
+<tr><th>property</th><th>description</th><th>default</th><th>required?</th></tr>
+</thead>
+<tbody>
+<tr><td>type</td><td>This should always be <code>maxSize</code>.</td><td>none</td><td>yes</td></tr>
+<tr><td>maxSplitSize</td><td>Maximum number of bytes of input files to process in a single subtask. If a single file is larger than this number, it will be processed by itself in a single subtask (Files are never split across tasks yet). Note that one subtask will not process more files than <code>maxNumFiles</code> even when their total size is smaller than <code>maxSplitSize</code>. <a href="/docs/0.20.0/configuration/human-readable-byte.html">Human-readable format</a> is supported.</td><td>1GiB</td><td>no</td></tr>
+<tr><td>maxNumFiles</td><td>Maximum number of input files to process in a single subtask. This limit is to avoid task failures when the ingestion spec is too long. There are two known limits on the max size of serialized ingestion spec, i.e., the max ZNode size in ZooKeeper (<code>jute.maxbuffer</code>) and the max packet size in MySQL (<code>max_allowed_packet</code>). These can make ingestion tasks fail if the serialized ingestion spec size hits one of them. Note that one subtask will not process more data than <code>maxSplitSize</code> even when the total number of files is smaller than <code>maxNumFiles</code>.</td><td>1000</td><td>no</td></tr>
+</tbody>
+</table>
+<h4><a class="anchor" aria-hidden="true" id="segments-split-hint-spec"></a><a href="#segments-split-hint-spec" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Segments Split Hint Spec</h4>
+<p>The segments split hint spec is used only for <a href="#druid-input-source"><code>DruidInputSource</code></a> (and legacy <a href="#ingestsegmentfirehose"><code>IngestSegmentFirehose</code></a>).</p>
+<table>
+<thead>
+<tr><th>property</th><th>description</th><th>default</th><th>required?</th></tr>
+</thead>
+<tbody>
+<tr><td>type</td><td>This should always be <code>segments</code>.</td><td>none</td><td>yes</td></tr>
+<tr><td>maxInputSegmentBytesPerTask</td><td>Maximum number of bytes of input segments to process in a single subtask. If a single segment is larger than this number, it will be processed by itself in a single subtask (input segments are never split across tasks). Note that one subtask will not process more segments than <code>maxNumSegments</code> even when their total size is smaller than <code>maxInputSegmentBytesPerTask</code>. <a href="/docs/0.20.0/configuration/human-readable-byte.html">Human-readable format</a> is supported.</td><td>1GiB</td><td>no</td></tr>
+<tr><td>maxNumSegments</td><td>Maximum number of input segments to process in a single subtask. This limit is to avoid task failures when the ingestion spec is too long. There are two known limits on the max size of serialized ingestion spec, i.e., the max ZNode size in ZooKeeper (<code>jute.maxbuffer</code>) and the max packet size in MySQL (<code>max_allowed_packet</code>). These can make ingestion tasks fail if the serialized ingestion spec size hits one of them. Note that one subtask will not process more data than <code>maxInputSegmentBytesPerTask</code> even when the total number of segments is smaller than <code>maxNumSegments</code>.</td><td>1000</td><td>no</td></tr>
+</tbody>
+</table>
+<h3><a class="anchor" aria-hidden="true" id="partitionsspec"></a><a href="#partitionsspec" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a><code>partitionsSpec</code></h3>
+<p>PartitionsSpec is used to describe the secondary partitioning method.
+You should use different partitionsSpec depending on the <a href="/docs/0.20.0/ingestion/index.html#rollup">rollup mode</a> you want.
+For perfect rollup, you should use either <code>hashed</code> (partitioning based on the hash of dimensions in each row) or
+<code>single_dim</code> (based on ranges of a single dimension). For best-effort rollup, you should use <code>dynamic</code>.</p>
+<p>The three <code>partitionsSpec</code> types have different characteristics.</p>
+<table>
+<thead>
+<tr><th>PartitionsSpec</th><th>Ingestion speed</th><th>Partitioning method</th><th>Supported rollup mode</th><th>Secondary partition pruning at query time</th></tr>
+</thead>
+<tbody>
+<tr><td><code>dynamic</code></td><td>Fastest</td><td>Partitioning based on number of rows in segment.</td><td>Best-effort rollup</td><td>N/A</td></tr>
+<tr><td><code>hashed</code></td><td>Moderate</td><td>Partitioning based on the hash value of partition dimensions. This partitioning may reduce your datasource size and query latency by improving data locality. See <a href="/docs/0.20.0/ingestion/index.html#partitioning">Partitioning</a> for more details.</td><td>Perfect rollup</td><td>The broker can use the partition information to prune segments early to speed up queries. Since the broker knows how to hash <code>partitionDimensions</code> values to locate a segment, given a query including a filter on all the <code>partitionDimensions</code>, the broker can pick up only the segments holding the rows satisfying the filter on <code>partitionDimensions</code> for query processing.<br/><br/>Note that <code>partitionDimensions</code> must be set at ingestion time to enable secondary partition pruning at query time.</td></tr>
+<tr><td><code>single_dim</code></td><td>Slowest</td><td>Range partitioning based on the value of the partition dimension. Segment sizes may be skewed depending on the partition key distribution. This may reduce your datasource size and query latency by improving data locality. See <a href="/docs/0.20.0/ingestion/index.html#partitioning">Partitioning</a> for more details.</td><td>Perfect rollup</td><td>The broker can use the partition information to prune segments early to speed up queries. Since the broker knows the range of <code>partitionDimension</code> values in each segment, given a query including a filter on the <code>partitionDimension</code>, the broker can pick up only the segments holding the rows satisfying the filter on <code>partitionDimension</code> for query processing.</td></tr>
+</tbody>
+</table>
+<p>The recommended use case for each partitionsSpec is:</p>
+<ul>
+<li>If your data has a uniformly distributed column which is frequently used in your queries,
+consider using <code>single_dim</code> partitionsSpec to maximize the performance of most of your queries.</li>
+<li>If your data doesn't have a uniformly distributed column, but is expected to have a <a href="/docs/0.20.0/ingestion/index.html#maximizing-rollup-ratio">high rollup ratio</a>
+when you roll up with some dimensions, consider using <code>hashed</code> partitionsSpec.
+It could reduce the size of datasource and query latency by improving data locality.</li>
+<li>If the above two scenarios are not the case or you don't need to roll up your datasource,
+consider using <code>dynamic</code> partitionsSpec.</li>
+</ul>
+<h4><a class="anchor" aria-hidden="true" id="dynamic-partitioning"></a><a href="#dynamic-partitioning" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Dynamic partitioning</h4>
+<table>
+<thead>
+<tr><th>property</th><th>description</th><th>default</th><th>required?</th></tr>
+</thead>
+<tbody>
+<tr><td>type</td><td>This should always be <code>dynamic</code></td><td>none</td><td>yes</td></tr>
+<tr><td>maxRowsPerSegment</td><td>Used in sharding. Determines how many rows are in each segment.</td><td>5000000</td><td>no</td></tr>
+<tr><td>maxTotalRows</td><td>Total number of rows across all segments waiting for being pushed. Used in determining when intermediate segment push should occur.</td><td>20000000</td><td>no</td></tr>
+</tbody>
+</table>
+<p>With the Dynamic partitioning, the parallel index task runs in a single phase:
+it will spawn multiple worker tasks (type <code>single_phase_sub_task</code>), each of which creates segments.
+How the worker task creates segments is:</p>
+<ul>
+<li>The task creates a new segment whenever the number of rows in the current segment exceeds
+<code>maxRowsPerSegment</code>.</li>
+<li>Once the total number of rows in all segments across all time chunks reaches to <code>maxTotalRows</code>,
+the task pushes all segments created so far to the deep storage and creates new ones.</li>
+</ul>
+<h4><a class="anchor" aria-hidden="true" id="hash-based-partitioning"></a><a href="#hash-based-partitioning" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Hash-based partitioning</h4>
+<table>
+<thead>
+<tr><th>property</th><th>description</th><th>default</th><th>required?</th></tr>
+</thead>
+<tbody>
+<tr><td>type</td><td>This should always be <code>hashed</code></td><td>none</td><td>yes</td></tr>
+<tr><td>numShards</td><td>Directly specify the number of shards to create. If this is specified and <code>intervals</code> is specified in the <code>granularitySpec</code>, the index task can skip the determine intervals/partitions pass through the data. This property and <code>targetRowsPerSegment</code> cannot both be set.</td><td>none</td><td>no</td></tr>
+<tr><td>targetRowsPerSegment</td><td>A target row count for each partition. If <code>numShards</code> is left unspecified, the Parallel task will determine a partition count automatically such that each partition has a row count close to the target, assuming evenly distributed keys in the input data. A target per-segment row count of 5 million is used if both <code>numShards</code> and <code>targetRowsPerSegment</code> are null.</td><td>null (or 5,000,000 if both <code>numShards</code> and <code>targetRowsPerSegment</code> are null)</td><td>no</td></tr>
+<tr><td>partitionDimensions</td><td>The dimensions to partition on. Leave blank to select all dimensions.</td><td>null</td><td>no</td></tr>
+<tr><td>partitionFunction</td><td>A function to compute hash of partition dimensions. See <a href="#hash-partition-function">Hash partition function</a></td><td><code>murmur3_32_abs</code></td><td>no</td></tr>
+</tbody>
+</table>
+<p>The Parallel task with hash-based partitioning is similar to <a href="https://en.wikipedia.org/wiki/MapReduce">MapReduce</a>.
+The task runs in up to 3 phases: <code>partial dimension cardinality</code>, <code>partial segment generation</code> and <code>partial segment merge</code>.</p>
+<ul>
+<li>The <code>partial dimension cardinality</code> phase is an optional phase that only runs if <code>numShards</code> is not specified.
+The Parallel task splits the input data and assigns them to worker tasks based on the split hint spec.
+Each worker task (type <code>partial_dimension_cardinality</code>) gathers estimates of partitioning dimensions cardinality for
+each time chunk. The Parallel task will aggregate these estimates from the worker tasks and determine the highest
+cardinality across all of the time chunks in the input data, dividing this cardinality by <code>targetRowsPerSegment</code> to
+automatically determine <code>numShards</code>.</li>
+<li>In the <code>partial segment generation</code> phase, just like the Map phase in MapReduce,
+the Parallel task splits the input data based on the split hint spec
+and assigns each split to a worker task. Each worker task (type <code>partial_index_generate</code>) reads the assigned split,
+and partitions rows by the time chunk from <code>segmentGranularity</code> (primary partition key) in the <code>granularitySpec</code>
+and then by the hash value of <code>partitionDimensions</code> (secondary partition key) in the <code>partitionsSpec</code>.
+The partitioned data is stored in local storage of
+the <a href="/docs/0.20.0/design/middlemanager.html">middleManager</a> or the <a href="/docs/0.20.0/design/indexer.html">indexer</a>.</li>
+<li>The <code>partial segment merge</code> phase is similar to the Reduce phase in MapReduce.
+The Parallel task spawns a new set of worker tasks (type <code>partial_index_generic_merge</code>) to merge the partitioned data
+created in the previous phase. Here, the partitioned data is shuffled based on
+the time chunk and the hash value of <code>partitionDimensions</code> to be merged; each worker task reads the data
+falling in the same time chunk and the same hash value from multiple MiddleManager/Indexer processes and merges
+them to create the final segments. Finally, they push the final segments to the deep storage at once.</li>
+</ul>
+<h5><a class="anchor" aria-hidden="true" id="hash-partition-function"></a><a href="#hash-partition-function" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Hash partition function</h5>
+<p>In hash partitioning, the partition function is used to compute hash of partition dimensions. The partition dimension
+values are first serialized into a byte array as a whole, and then the partition function is applied to compute hash of
+the byte array.
+Druid currently supports only one partition function.</p>
+<table>
+<thead>
+<tr><th>name</th><th>description</th></tr>
+</thead>
+<tbody>
+<tr><td><code>murmur3_32_abs</code></td><td>Applies an absolute value function to the result of <a href="https://guava.dev/releases/16.0/api/docs/com/google/common/hash/Hashing.html#murmur3_32()"><code>murmur3_32</code></a>.</td></tr>
+</tbody>
+</table>
+<h4><a class="anchor" aria-hidden="true" id="single-dimension-range-partitioning"></a><a href="#single-dimension-range-partitioning" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Single-dimension range partitioning</h4>
+<blockquote>
+<p>Single dimension range partitioning is currently not supported in the sequential mode of the Parallel task.
+The Parallel task will use one subtask when you set <code>maxNumConcurrentSubTasks</code> to 1.</p>
+</blockquote>
+<table>
+<thead>
+<tr><th>property</th><th>description</th><th>default</th><th>required?</th></tr>
+</thead>
+<tbody>
+<tr><td>type</td><td>This should always be <code>single_dim</code></td><td>none</td><td>yes</td></tr>
+<tr><td>partitionDimension</td><td>The dimension to partition on. Only rows with a single dimension value are allowed.</td><td>none</td><td>yes</td></tr>
+<tr><td>targetRowsPerSegment</td><td>Target number of rows to include in a partition, should be a number that targets segments of 500MB~1GB.</td><td>none</td><td>either this or <code>maxRowsPerSegment</code></td></tr>
+<tr><td>maxRowsPerSegment</td><td>Soft max for the number of rows to include in a partition.</td><td>none</td><td>either this or <code>targetRowsPerSegment</code></td></tr>
+<tr><td>assumeGrouped</td><td>Assume that input data has already been grouped on time and dimensions. Ingestion will run faster, but may choose sub-optimal partitions if this assumption is violated.</td><td>false</td><td>no</td></tr>
+</tbody>
+</table>
+<p>With <code>single-dim</code> partitioning, the Parallel task runs in 3 phases,
+i.e., <code>partial dimension distribution</code>, <code>partial segment generation</code>, and <code>partial segment merge</code>.
+The first phase is to collect some statistics to find
+the best partitioning and the other 2 phases are to create partial segments
+and to merge them, respectively, as in hash-based partitioning.</p>
+<ul>
+<li>In the <code>partial dimension distribution</code> phase, the Parallel task splits the input data and
+assigns them to worker tasks based on the split hint spec. Each worker task (type <code>partial_dimension_distribution</code>) reads
+the assigned split and builds a histogram for <code>partitionDimension</code>.
+The Parallel task collects those histograms from worker tasks and finds
+the best range partitioning based on <code>partitionDimension</code> to evenly
+distribute rows across partitions. Note that either <code>targetRowsPerSegment</code>
+or <code>maxRowsPerSegment</code> will be used to find the best partitioning.</li>
+<li>In the <code>partial segment generation</code> phase, the Parallel task spawns new worker tasks (type <code>partial_range_index_generate</code>)
+to create partitioned data. Each worker task reads a split created as in the previous phase,
+partitions rows by the time chunk from the <code>segmentGranularity</code> (primary partition key) in the <code>granularitySpec</code>
+and then by the range partitioning found in the previous phase.
+The partitioned data is stored in local storage of
+the <a href="/docs/0.20.0/design/middlemanager.html">middleManager</a> or the <a href="/docs/0.20.0/design/indexer.html">indexer</a>.</li>
+<li>In the <code>partial segment merge</code> phase, the parallel index task spawns a new set of worker tasks (type <code>partial_index_generic_merge</code>) to merge the partitioned
+data created in the previous phase. Here, the partitioned data is shuffled based on
+the time chunk and the value of <code>partitionDimension</code>; each worker task reads the segments
+falling in the same partition of the same range from multiple MiddleManager/Indexer processes and merges
+them to create the final segments. Finally, they push the final segments to the deep storage.</li>
+</ul>
+<blockquote>
+<p>Because the task with single-dimension range partitioning makes two passes over the input
+in <code>partial dimension distribution</code> and <code>partial segment generation</code> phases,
+the task may fail if the input changes in between the two passes.</p>
+</blockquote>
+<h3><a class="anchor" aria-hidden="true" id="http-status-endpoints"></a><a href="#http-status-endpoints" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>HTTP status endpoints</h3>
+<p>The supervisor task provides some HTTP endpoints to get running status.</p>
+<ul>
+<li><code>http://{PEON_IP}:{PEON_PORT}/druid/worker/v1/chat/{SUPERVISOR_TASK_ID}/mode</code></li>
+</ul>
+<p>Returns 'parallel' if the indexing task is running in parallel. Otherwise, it returns 'sequential'.</p>
+<ul>
+<li><code>http://{PEON_IP}:{PEON_PORT}/druid/worker/v1/chat/{SUPERVISOR_TASK_ID}/phase</code></li>
+</ul>
+<p>Returns the name of the current phase if the task running in the parallel mode.</p>
+<ul>
+<li><code>http://{PEON_IP}:{PEON_PORT}/druid/worker/v1/chat/{SUPERVISOR_TASK_ID}/progress</code></li>
+</ul>
+<p>Returns the estimated progress of the current phase if the supervisor task is running in the parallel mode.</p>
+<p>An example of the result is</p>
+<pre><code class="hljs css language-json">{
+  <span class="hljs-attr">"running"</span>:<span class="hljs-number">10</span>,
+  <span class="hljs-attr">"succeeded"</span>:<span class="hljs-number">0</span>,
+  <span class="hljs-attr">"failed"</span>:<span class="hljs-number">0</span>,
+  <span class="hljs-attr">"complete"</span>:<span class="hljs-number">0</span>,
+  <span class="hljs-attr">"total"</span>:<span class="hljs-number">10</span>,
+  <span class="hljs-attr">"estimatedExpectedSucceeded"</span>:<span class="hljs-number">10</span>
+}
+</code></pre>
+<ul>
+<li><code>http://{PEON_IP}:{PEON_PORT}/druid/worker/v1/chat/{SUPERVISOR_TASK_ID}/subtasks/running</code></li>
+</ul>
+<p>Returns the task IDs of running worker tasks, or an empty list if the supervisor task is running in the sequential mode.</p>
+<ul>
+<li><code>http://{PEON_IP}:{PEON_PORT}/druid/worker/v1/chat/{SUPERVISOR_TASK_ID}/subtaskspecs</code></li>
+</ul>
+<p>Returns all worker task specs, or an empty list if the supervisor task is running in the sequential mode.</p>
+<ul>
+<li><code>http://{PEON_IP}:{PEON_PORT}/druid/worker/v1/chat/{SUPERVISOR_TASK_ID}/subtaskspecs/running</code></li>
+</ul>
+<p>Returns running worker task specs, or an empty list if the supervisor task is running in the sequential mode.</p>
+<ul>
+<li><code>http://{PEON_IP}:{PEON_PORT}/druid/worker/v1/chat/{SUPERVISOR_TASK_ID}/subtaskspecs/complete</code></li>
+</ul>
+<p>Returns complete worker task specs, or an empty list if the supervisor task is running in the sequential mode.</p>
+<ul>
+<li><code>http://{PEON_IP}:{PEON_PORT}/druid/worker/v1/chat/{SUPERVISOR_TASK_ID}/subtaskspec/{SUB_TASK_SPEC_ID}</code></li>
+</ul>
+<p>Returns the worker task spec of the given id, or HTTP 404 Not Found error if the supervisor task is running in the sequential mode.</p>
+<ul>
+<li><code>http://{PEON_IP}:{PEON_PORT}/druid/worker/v1/chat/{SUPERVISOR_TASK_ID}/subtaskspec/{SUB_TASK_SPEC_ID}/state</code></li>
+</ul>
+<p>Returns the state of the worker task spec of the given id, or HTTP 404 Not Found error if the supervisor task is running in the sequential mode.
+The returned result contains the worker task spec, a current task status if exists, and task attempt history.</p>
+<p>An example of the result is</p>
+<pre><code class="hljs css language-json">{
+  <span class="hljs-attr">"spec"</span>: {
+    <span class="hljs-attr">"id"</span>: <span class="hljs-string">"index_parallel_lineitem_2018-04-20T22:12:43.610Z_2"</span>,
+    <span class="hljs-attr">"groupId"</span>: <span class="hljs-string">"index_parallel_lineitem_2018-04-20T22:12:43.610Z"</span>,
+    <span class="hljs-attr">"supervisorTaskId"</span>: <span class="hljs-string">"index_parallel_lineitem_2018-04-20T22:12:43.610Z"</span>,
+    <span class="hljs-attr">"context"</span>: <span class="hljs-literal">null</span>,
+    <span class="hljs-attr">"inputSplit"</span>: {
+      <span class="hljs-attr">"split"</span>: <span class="hljs-string">"/path/to/data/lineitem.tbl.5"</span>
+    },
+    <span class="hljs-attr">"ingestionSpec"</span>: {
+      <span class="hljs-attr">"dataSchema"</span>: {
+        <span class="hljs-attr">"dataSource"</span>: <span class="hljs-string">"lineitem"</span>,
+        <span class="hljs-attr">"timestampSpec"</span>: {
+          <span class="hljs-attr">"column"</span>: <span class="hljs-string">"l_shipdate"</span>,
+          <span class="hljs-attr">"format"</span>: <span class="hljs-string">"yyyy-MM-dd"</span>
+        },
+        <span class="hljs-attr">"dimensionsSpec"</span>: {
+          <span class="hljs-attr">"dimensions"</span>: [
+            <span class="hljs-string">"l_orderkey"</span>,
+            <span class="hljs-string">"l_partkey"</span>,
+            <span class="hljs-string">"l_suppkey"</span>,
+            <span class="hljs-string">"l_linenumber"</span>,
+            <span class="hljs-string">"l_returnflag"</span>,
+            <span class="hljs-string">"l_linestatus"</span>,
+            <span class="hljs-string">"l_shipdate"</span>,
+            <span class="hljs-string">"l_commitdate"</span>,
+            <span class="hljs-string">"l_receiptdate"</span>,
+            <span class="hljs-string">"l_shipinstruct"</span>,
+            <span class="hljs-string">"l_shipmode"</span>,
+            <span class="hljs-string">"l_comment"</span>
+          ]
+        },
+        <span class="hljs-attr">"metricsSpec"</span>: [
+          {
+            <span class="hljs-attr">"type"</span>: <span class="hljs-string">"count"</span>,
+            <span class="hljs-attr">"name"</span>: <span class="hljs-string">"count"</span>
+          },
+          {
+            <span class="hljs-attr">"type"</span>: <span class="hljs-string">"longSum"</span>,
+            <span class="hljs-attr">"name"</span>: <span class="hljs-string">"l_quantity"</span>,
+            <span class="hljs-attr">"fieldName"</span>: <span class="hljs-string">"l_quantity"</span>,
+            <span class="hljs-attr">"expression"</span>: <span class="hljs-literal">null</span>
+          },
+          {
+            <span class="hljs-attr">"type"</span>: <span class="hljs-string">"doubleSum"</span>,
+            <span class="hljs-attr">"name"</span>: <span class="hljs-string">"l_extendedprice"</span>,
+            <span class="hljs-attr">"fieldName"</span>: <span class="hljs-string">"l_extendedprice"</span>,
+            <span class="hljs-attr">"expression"</span>: <span class="hljs-literal">null</span>
+          },
+          {
+            <span class="hljs-attr">"type"</span>: <span class="hljs-string">"doubleSum"</span>,
+            <span class="hljs-attr">"name"</span>: <span class="hljs-string">"l_discount"</span>,
+            <span class="hljs-attr">"fieldName"</span>: <span class="hljs-string">"l_discount"</span>,
+            <span class="hljs-attr">"expression"</span>: <span class="hljs-literal">null</span>
+          },
+          {
+            <span class="hljs-attr">"type"</span>: <span class="hljs-string">"doubleSum"</span>,
+            <span class="hljs-attr">"name"</span>: <span class="hljs-string">"l_tax"</span>,
+            <span class="hljs-attr">"fieldName"</span>: <span class="hljs-string">"l_tax"</span>,
+            <span class="hljs-attr">"expression"</span>: <span class="hljs-literal">null</span>
+          }
+        ],
+        <span class="hljs-attr">"granularitySpec"</span>: {
+          <span class="hljs-attr">"type"</span>: <span class="hljs-string">"uniform"</span>,
+          <span class="hljs-attr">"segmentGranularity"</span>: <span class="hljs-string">"YEAR"</span>,
+          <span class="hljs-attr">"queryGranularity"</span>: {
+            <span class="hljs-attr">"type"</span>: <span class="hljs-string">"none"</span>
+          },
+          <span class="hljs-attr">"rollup"</span>: <span class="hljs-literal">true</span>,
+          <span class="hljs-attr">"intervals"</span>: [
+            <span class="hljs-string">"1980-01-01T00:00:00.000Z/2020-01-01T00:00:00.000Z"</span>
+          ]
+        },
+        <span class="hljs-attr">"transformSpec"</span>: {
+          <span class="hljs-attr">"filter"</span>: <span class="hljs-literal">null</span>,
+          <span class="hljs-attr">"transforms"</span>: []
+        }
+      },
+      <span class="hljs-attr">"ioConfig"</span>: {
+        <span class="hljs-attr">"type"</span>: <span class="hljs-string">"index_parallel"</span>,
+        <span class="hljs-attr">"inputSource"</span>: {
+          <span class="hljs-attr">"type"</span>: <span class="hljs-string">"local"</span>,
+          <span class="hljs-attr">"baseDir"</span>: <span class="hljs-string">"/path/to/data/"</span>,
+          <span class="hljs-attr">"filter"</span>: <span class="hljs-string">"lineitem.tbl.5"</span>
+        },
+        <span class="hljs-attr">"inputFormat"</span>: {
+          <span class="hljs-attr">"format"</span>: <span class="hljs-string">"tsv"</span>,
+          <span class="hljs-attr">"delimiter"</span>: <span class="hljs-string">"|"</span>,
+          <span class="hljs-attr">"columns"</span>: [
+            <span class="hljs-string">"l_orderkey"</span>,
+            <span class="hljs-string">"l_partkey"</span>,
+            <span class="hljs-string">"l_suppkey"</span>,
+            <span class="hljs-string">"l_linenumber"</span>,
+            <span class="hljs-string">"l_quantity"</span>,
+            <span class="hljs-string">"l_extendedprice"</span>,
+            <span class="hljs-string">"l_discount"</span>,
+            <span class="hljs-string">"l_tax"</span>,
+            <span class="hljs-string">"l_returnflag"</span>,
+            <span class="hljs-string">"l_linestatus"</span>,
+            <span class="hljs-string">"l_shipdate"</span>,
+            <span class="hljs-string">"l_commitdate"</span>,
+            <span class="hljs-string">"l_receiptdate"</span>,
+            <span class="hljs-string">"l_shipinstruct"</span>,
+            <span class="hljs-string">"l_shipmode"</span>,
+            <span class="hljs-string">"l_comment"</span>
+          ]
+        },
+        <span class="hljs-attr">"appendToExisting"</span>: <span class="hljs-literal">false</span>
+      },
+      <span class="hljs-attr">"tuningConfig"</span>: {
+        <span class="hljs-attr">"type"</span>: <span class="hljs-string">"index_parallel"</span>,
+        <span class="hljs-attr">"maxRowsPerSegment"</span>: <span class="hljs-number">5000000</span>,
+        <span class="hljs-attr">"maxRowsInMemory"</span>: <span class="hljs-number">1000000</span>,
+        <span class="hljs-attr">"maxTotalRows"</span>: <span class="hljs-number">20000000</span>,
+        <span class="hljs-attr">"numShards"</span>: <span class="hljs-literal">null</span>,
+        <span class="hljs-attr">"indexSpec"</span>: {
+          <span class="hljs-attr">"bitmap"</span>: {
+            <span class="hljs-attr">"type"</span>: <span class="hljs-string">"roaring"</span>
+          },
+          <span class="hljs-attr">"dimensionCompression"</span>: <span class="hljs-string">"lz4"</span>,
+          <span class="hljs-attr">"metricCompression"</span>: <span class="hljs-string">"lz4"</span>,
+          <span class="hljs-attr">"longEncoding"</span>: <span class="hljs-string">"longs"</span>
+        },
+        <span class="hljs-attr">"indexSpecForIntermediatePersists"</span>: {
+          <span class="hljs-attr">"bitmap"</span>: {
+            <span class="hljs-attr">"type"</span>: <span class="hljs-string">"roaring"</span>
+          },
+          <span class="hljs-attr">"dimensionCompression"</span>: <span class="hljs-string">"lz4"</span>,
+          <span class="hljs-attr">"metricCompression"</span>: <span class="hljs-string">"lz4"</span>,
+          <span class="hljs-attr">"longEncoding"</span>: <span class="hljs-string">"longs"</span>
+        },
+        <span class="hljs-attr">"maxPendingPersists"</span>: <span class="hljs-number">0</span>,
+        <span class="hljs-attr">"reportParseExceptions"</span>: <span class="hljs-literal">false</span>,
+        <span class="hljs-attr">"pushTimeout"</span>: <span class="hljs-number">0</span>,
+        <span class="hljs-attr">"segmentWriteOutMediumFactory"</span>: <span class="hljs-literal">null</span>,
+        <span class="hljs-attr">"maxNumConcurrentSubTasks"</span>: <span class="hljs-number">4</span>,
+        <span class="hljs-attr">"maxRetry"</span>: <span class="hljs-number">3</span>,
+        <span class="hljs-attr">"taskStatusCheckPeriodMs"</span>: <span class="hljs-number">1000</span>,
+        <span class="hljs-attr">"chatHandlerTimeout"</span>: <span class="hljs-string">"PT10S"</span>,
+        <span class="hljs-attr">"chatHandlerNumRetries"</span>: <span class="hljs-number">5</span>,
+        <span class="hljs-attr">"logParseExceptions"</span>: <span class="hljs-literal">false</span>,
+        <span class="hljs-attr">"maxParseExceptions"</span>: <span class="hljs-number">2147483647</span>,
+        <span class="hljs-attr">"maxSavedParseExceptions"</span>: <span class="hljs-number">0</span>,
+        <span class="hljs-attr">"forceGuaranteedRollup"</span>: <span class="hljs-literal">false</span>,
+        <span class="hljs-attr">"buildV9Directly"</span>: <span class="hljs-literal">true</span>
+      }
+    }
+  },
+  <span class="hljs-attr">"currentStatus"</span>: {
+    <span class="hljs-attr">"id"</span>: <span class="hljs-string">"index_sub_lineitem_2018-04-20T22:16:29.922Z"</span>,
+    <span class="hljs-attr">"type"</span>: <span class="hljs-string">"index_sub"</span>,
+    <span class="hljs-attr">"createdTime"</span>: <span class="hljs-string">"2018-04-20T22:16:29.925Z"</span>,
+    <span class="hljs-attr">"queueInsertionTime"</span>: <span class="hljs-string">"2018-04-20T22:16:29.929Z"</span>,
+    <span class="hljs-attr">"statusCode"</span>: <span class="hljs-string">"RUNNING"</span>,
+    <span class="hljs-attr">"duration"</span>: <span class="hljs-number">-1</span>,
+    <span class="hljs-attr">"location"</span>: {
+      <span class="hljs-attr">"host"</span>: <span class="hljs-literal">null</span>,
+      <span class="hljs-attr">"port"</span>: <span class="hljs-number">-1</span>,
+      <span class="hljs-attr">"tlsPort"</span>: <span class="hljs-number">-1</span>
+    },
+    <span class="hljs-attr">"dataSource"</span>: <span class="hljs-string">"lineitem"</span>,
+    <span class="hljs-attr">"errorMsg"</span>: <span class="hljs-literal">null</span>
+  },
+  <span class="hljs-attr">"taskHistory"</span>: []
+}
+</code></pre>
+<ul>
+<li><code>http://{PEON_IP}:{PEON_PORT}/druid/worker/v1/chat/{SUPERVISOR_TASK_ID}/subtaskspec/{SUB_TASK_SPEC_ID}/history</code></li>
+</ul>
+<p>Returns the task attempt history of the worker task spec of the given id, or HTTP 404 Not Found error if the supervisor task is running in the sequential mode.</p>
+<h3><a class="anchor" aria-hidden="true" id="capacity-planning"></a><a href="#capacity-planning" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Capacity planning</h3>
+<p>The supervisor task can create up to <code>maxNumConcurrentSubTasks</code> worker tasks no matter how many task slots are currently available.
+As a result, total number of tasks which can be run at the same time is <code>(maxNumConcurrentSubTasks + 1)</code> (including the supervisor task).
+Please note that this can be even larger than total number of task slots (sum of the capacity of all workers).
+If <code>maxNumConcurrentSubTasks</code> is larger than <code>n (available task slots)</code>, then
+<code>maxNumConcurrentSubTasks</code> tasks are created by the supervisor task, but only <code>n</code> tasks would be started.
+Others will wait in the pending state until any running task is finished.</p>
+<p>If you are using the Parallel Index Task with stream ingestion together,
+we would recommend to limit the max capacity for batch ingestion to prevent
+stream ingestion from being blocked by batch ingestion. Suppose you have
+<code>t</code> Parallel Index Tasks to run at the same time, but want to limit
+the max number of tasks for batch ingestion to <code>b</code>. Then, (sum of <code>maxNumConcurrentSubTasks</code>
+of all Parallel Index Tasks + <code>t</code> (for supervisor tasks)) must be smaller than <code>b</code>.</p>
+<p>If you have some tasks of a higher priority than others, you may set their
+<code>maxNumConcurrentSubTasks</code> to a higher value than lower priority tasks.
+This may help the higher priority tasks to finish earlier than lower priority tasks
+by assigning more task slots to them.</p>
+<h2><a class="anchor" aria-hidden="true" id="simple-task"></a><a href="#simple-task" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Simple task</h2>
+<p>The simple task (type <code>index</code>) is designed to be used for smaller data sets. The task executes within the indexing service.</p>
+<h3><a class="anchor" aria-hidden="true" id="task-syntax-1"></a><a href="#task-syntax-1" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Task syntax</h3>
+<p>A sample task is shown below:</p>
+<pre><code class="hljs css language-json">{
+  <span class="hljs-attr">"type"</span> : <span class="hljs-string">"index"</span>,
+  <span class="hljs-attr">"spec"</span> : {
+    <span class="hljs-attr">"dataSchema"</span> : {
+      <span class="hljs-attr">"dataSource"</span> : <span class="hljs-string">"wikipedia"</span>,
+      <span class="hljs-attr">"timestampSpec"</span> : {
+        <span class="hljs-attr">"column"</span> : <span class="hljs-string">"timestamp"</span>,
+        <span class="hljs-attr">"format"</span> : <span class="hljs-string">"auto"</span>
+      },
+      <span class="hljs-attr">"dimensionsSpec"</span> : {
+        <span class="hljs-attr">"dimensions"</span>: [<span class="hljs-string">"page"</span>,<span class="hljs-string">"language"</span>,<span class="hljs-string">"user"</span>,<span class="hljs-string">"unpatrolled"</span>,<span class="hljs-string">"newPage"</span>,<span class="hljs-string">"robot"</span>,<span class="hljs-string">"anonymous"</span>,<span class="hljs-string">"namespace"</span>,<span class="hljs-string">"continent"</span>,<span class="hljs-string">"country"</span>,<span class="hljs-string">"region"</span>,<span class="hljs-string">"city"</span>],
+        <span class="hljs-attr">"dimensionExclusions"</span> : []
+      },
+      <span class="hljs-attr">"metricsSpec"</span> : [
+        {
+          <span class="hljs-attr">"type"</span> : <span class="hljs-string">"count"</span>,
+          <span class="hljs-attr">"name"</span> : <span class="hljs-string">"count"</span>
+        },
+        {
+          <span class="hljs-attr">"type"</span> : <span class="hljs-string">"doubleSum"</span>,
+          <span class="hljs-attr">"name"</span> : <span class="hljs-string">"added"</span>,
+          <span class="hljs-attr">"fieldName"</span> : <span class="hljs-string">"added"</span>
+        },
+        {
+          <span class="hljs-attr">"type"</span> : <span class="hljs-string">"doubleSum"</span>,
+          <span class="hljs-attr">"name"</span> : <span class="hljs-string">"deleted"</span>,
+          <span class="hljs-attr">"fieldName"</span> : <span class="hljs-string">"deleted"</span>
+        },
+        {
+          <span class="hljs-attr">"type"</span> : <span class="hljs-string">"doubleSum"</span>,
+          <span class="hljs-attr">"name"</span> : <span class="hljs-string">"delta"</span>,
+          <span class="hljs-attr">"fieldName"</span> : <span class="hljs-string">"delta"</span>
+        }
+      ],
+      <span class="hljs-attr">"granularitySpec"</span> : {
+        <span class="hljs-attr">"type"</span> : <span class="hljs-string">"uniform"</span>,
+        <span class="hljs-attr">"segmentGranularity"</span> : <span class="hljs-string">"DAY"</span>,
+        <span class="hljs-attr">"queryGranularity"</span> : <span class="hljs-string">"NONE"</span>,
+        <span class="hljs-attr">"intervals"</span> : [ <span class="hljs-string">"2013-08-31/2013-09-01"</span> ]
+      }
+    },
+    <span class="hljs-attr">"ioConfig"</span> : {
+      <span class="hljs-attr">"type"</span> : <span class="hljs-string">"index"</span>,
+      <span class="hljs-attr">"inputSource"</span> : {
+        <span class="hljs-attr">"type"</span> : <span class="hljs-string">"local"</span>,
+        <span class="hljs-attr">"baseDir"</span> : <span class="hljs-string">"examples/indexing/"</span>,
+        <span class="hljs-attr">"filter"</span> : <span class="hljs-string">"wikipedia_data.json"</span>
+       },
+       <span class="hljs-attr">"inputFormat"</span>: {
+         <span class="hljs-attr">"type"</span>: <span class="hljs-string">"json"</span>
+       }
+    },
+    <span class="hljs-attr">"tuningConfig"</span> : {
+      <span class="hljs-attr">"type"</span> : <span class="hljs-string">"index"</span>,
+      <span class="hljs-attr">"maxRowsPerSegment"</span> : <span class="hljs-number">5000000</span>,
+      <span class="hljs-attr">"maxRowsInMemory"</span> : <span class="hljs-number">1000000</span>
+    }
+  }
+}
+</code></pre>
+<table>
+<thead>
+<tr><th>property</th><th>description</th><th>required?</th></tr>
+</thead>
+<tbody>
+<tr><td>type</td><td>The task type, this should always be <code>index</code>.</td><td>yes</td></tr>
+<tr><td>id</td><td>The task ID. If this is not explicitly specified, Druid generates the task ID using task type, data source name, interval, and date-time stamp.</td><td>no</td></tr>
+<tr><td>spec</td><td>The ingestion spec including the data schema, IOConfig, and TuningConfig. See below for more details.</td><td>yes</td></tr>
+<tr><td>context</td><td>Context containing various task configuration parameters. See below for more details.</td><td>no</td></tr>
+</tbody>
+</table>
+<h3><a class="anchor" aria-hidden="true" id="dataschema-1"></a><a href="#dataschema-1" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a><code>dataSchema</code></h3>
+<p>This field is required.</p>
+<p>See the <a href="/docs/0.20.0/ingestion/index.html#dataschema"><code>dataSchema</code></a> section of the ingestion docs for details.</p>
+<p>If you do not specify <code>intervals</code> explicitly in your dataSchema's granularitySpec, the Local Index Task will do an extra
+pass over the data to determine the range to lock when it starts up.  If you specify <code>intervals</code> explicitly, any rows
+outside the specified intervals will be thrown away. We recommend setting <code>intervals</code> explicitly if you know the time
+range of the data because it allows the task to skip the extra pass, and so that you don't accidentally replace data outside
+that range if there's some stray data with unexpected timestamps.</p>
+<h3><a class="anchor" aria-hidden="true" id="ioconfig-1"></a><a href="#ioconfig-1" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a><code>ioConfig</code></h3>
+<table>
+<thead>
+<tr><th>property</th><th>description</th><th>default</th><th>required?</th></tr>
+</thead>
+<tbody>
+<tr><td>type</td><td>The task type, this should always be &quot;index&quot;.</td><td>none</td><td>yes</td></tr>
+<tr><td>inputFormat</td><td><a href="/docs/0.20.0/ingestion/data-formats.html#input-format"><code>inputFormat</code></a> to specify how to parse input data.</td><td>none</td><td>yes</td></tr>
+<tr><td>appendToExisting</td><td>Creates segments as additional shards of the latest version, effectively appending to the segment set instead of replacing it. The current limitation is that you can append to any datasources regardless of their original partitioning scheme, but the appended segments should be partitioned using the <code>dynamic</code> partitionsSpec.</td><td>false</td><td>no</td></tr>
+</tbody>
+</table>
+<h3><a class="anchor" aria-hidden="true" id="tuningconfig-1"></a><a href="#tuningconfig-1" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a><code>tuningConfig</code></h3>
+<p>The tuningConfig is optional and default parameters will be used if no tuningConfig is specified. See below for more details.</p>
+<table>
+<thead>
+<tr><th>property</th><th>description</th><th>default</th><th>required?</th></tr>
+</thead>
+<tbody>
+<tr><td>type</td><td>The task type, this should always be &quot;index&quot;.</td><td>none</td><td>yes</td></tr>
+<tr><td>maxRowsPerSegment</td><td>Deprecated. Use <code>partitionsSpec</code> instead. Used in sharding. Determines how many rows are in each segment.</td><td>5000000</td><td>no</td></tr>
+<tr><td>maxRowsInMemory</td><td>Used in determining when intermediate persists to disk should occur. Normally user does not need to set this, but depending on the nature of data, if rows are short in terms of bytes, user may not want to store a million rows in memory and this value should be set.</td><td>1000000</td><td>no</td></tr>
+<tr><td>maxBytesInMemory</td><td>Used in determining when intermediate persists to disk should occur. Normally this is computed internally and user does not need to set it. This value represents number of bytes to aggregate in heap memory before persisting. This is based on a rough estimate of memory usage and not actual usage. The maximum heap memory usage for indexing is maxBytesInMemory * (2 + maxPendingPersists)</td><td>1/6 of max JVM memory</td><td>no</td></tr>
+<tr><td>maxTotalRows</td><td>Deprecated. Use <code>partitionsSpec</code> instead. Total number of rows in segments waiting for being pushed. Used in determining when intermediate pushing should occur.</td><td>20000000</td><td>no</td></tr>
+<tr><td>numShards</td><td>Deprecated. Use <code>partitionsSpec</code> instead. Directly specify the number of shards to create. If this is specified and <code>intervals</code> is specified in the <code>granularitySpec</code>, the index task can skip the determine intervals/partitions pass through the data. <code>numShards</code> cannot be specified if <code>maxRowsPerSegment</code> is set.</td><td>null</td><td>no</td></tr>
+<tr><td>partitionDimensions</td><td>Deprecated. Use <code>partitionsSpec</code> instead. The dimensions to partition on. Leave blank to select all dimensions. Only used with <code>forceGuaranteedRollup</code> = true, will be ignored otherwise.</td><td>null</td><td>no</td></tr>
+<tr><td>partitionsSpec</td><td>Defines how to partition data in each timeChunk, see <a href="#partitionsspec">PartitionsSpec</a></td><td><code>dynamic</code> if <code>forceGuaranteedRollup</code> = false, <code>hashed</code> if <code>forceGuaranteedRollup</code> = true</td><td>no</td></tr>
+<tr><td>indexSpec</td><td>Defines segment storage format options to be used at indexing time, see <a href="/docs/0.20.0/ingestion/index.html#indexspec">IndexSpec</a></td><td>null</td><td>no</td></tr>
+<tr><td>indexSpecForIntermediatePersists</td><td>Defines segment storage format options to be used at indexing time for intermediate persisted temporary segments. this can be used to disable dimension/metric compression on intermediate segments to reduce memory required for final merging. however, disabling compression on intermediate segments might increase page cache use while they are used before getting merged into final segment published, see <a href="/docs/0.20.0/ingestion/index.html#indexspec">IndexSpec</a> for possible values.</td><td>same as indexSpec</td><td>no</td></tr>
+<tr><td>maxPendingPersists</td><td>Maximum number of persists that can be pending but not started. If this limit would be exceeded by a new intermediate persist, ingestion will block until the currently-running persist finishes. Maximum heap memory usage for indexing scales with maxRowsInMemory * (2 + maxPendingPersists).</td><td>0 (meaning one persist can be running concurrently with ingestion, and none can be queued up)</td><td>no</td></tr>
+<tr><td>forceGuaranteedRollup</td><td>Forces guaranteeing the <a href="/docs/0.20.0/ingestion/index.html#rollup">perfect rollup</a>. The perfect rollup optimizes the total size of generated segments and querying time while indexing time will be increased. If this is set to true, the index task will read the entire input data twice: one for finding the optimal number of partitions per time chunk and one for generating segments. Note that the result segments would be hash-partitioned. This flag cannot be used with <code>appendToExisting</code> of IOConfig. For more details, see the below <strong>Segment pushing modes</strong> section.</td><td>false</td><td>no</td></tr>
+<tr><td>reportParseExceptions</td><td>DEPRECATED. If true, exceptions encountered during parsing will be thrown and will halt ingestion; if false, unparseable rows and fields will be skipped. Setting <code>reportParseExceptions</code> to true will override existing configurations for <code>maxParseExceptions</code> and <code>maxSavedParseExceptions</code>, setting <code>maxParseExceptions</code> to 0 and limiting <code>maxSavedParseExceptions</code> to no more than 1.</td><td>false</td><td>no</td></tr>
+<tr><td>pushTimeout</td><td>Milliseconds to wait for pushing segments. It must be &gt;= 0, where 0 means to wait forever.</td><td>0</td><td>no</td></tr>
+<tr><td>segmentWriteOutMediumFactory</td><td>Segment write-out medium to use when creating segments. See <a href="#segmentwriteoutmediumfactory">SegmentWriteOutMediumFactory</a>.</td><td>Not specified, the value from <code>druid.peon.defaultSegmentWriteOutMediumFactory.type</code> is used</td><td>no</td></tr>
+<tr><td>logParseExceptions</td><td>If true, log an error message when a parsing exception occurs, containing information about the row where the error occurred.</td><td>false</td><td>no</td></tr>
+<tr><td>maxParseExceptions</td><td>The maximum number of parse exceptions that can occur before the task halts ingestion and fails. Overridden if <code>reportParseExceptions</code> is set.</td><td>unlimited</td><td>no</td></tr>
+<tr><td>maxSavedParseExceptions</td><td>When a parse exception occurs, Druid can keep track of the most recent parse exceptions. &quot;maxSavedParseExceptions&quot; limits how many exception instances will be saved. These saved exceptions will be made available after the task finishes in the <a href="/docs/0.20.0/ingestion/tasks.html#task-reports">task completion report</a>. Overridden if <code>reportParseExceptions</code> is set.</td><td>0</td><td>no</td></tr>
+</tbody>
+</table>
+<h3><a class="anchor" aria-hidden="true" id="partitionsspec-1"></a><a href="#partitionsspec-1" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a><code>partitionsSpec</code></h3>
+<p>PartitionsSpec is to describe the secondary partitioning method.
+You should use different partitionsSpec depending on the <a href="/docs/0.20.0/ingestion/index.html#rollup">rollup mode</a> you want.
+For perfect rollup, you should use <code>hashed</code>.</p>
+<table>
+<thead>
+<tr><th>property</th><th>description</th><th>default</th><th>required?</th></tr>
+</thead>
+<tbody>
+<tr><td>type</td><td>This should always be <code>hashed</code></td><td>none</td><td>yes</td></tr>
+<tr><td>maxRowsPerSegment</td><td>Used in sharding. Determines how many rows are in each segment.</td><td>5000000</td><td>no</td></tr>
+<tr><td>numShards</td><td>Directly specify the number of shards to create. If this is specified and <code>intervals</code> is specified in the <code>granularitySpec</code>, the index task can skip the determine intervals/partitions pass through the data. <code>numShards</code> cannot be specified if <code>maxRowsPerSegment</code> is set.</td><td>null</td><td>no</td></tr>
+<tr><td>partitionDimensions</td><td>The dimensions to partition on. Leave blank to select all dimensions.</td><td>null</td><td>no</td></tr>
+<tr><td>partitionFunction</td><td>A function to compute hash of partition dimensions. See <a href="#hash-partition-function">Hash partition function</a></td><td><code>murmur3_32_abs</code></td><td>no</td></tr>
+</tbody>
+</table>
+<p>For best-effort rollup, you should use <code>dynamic</code>.</p>
+<table>
+<thead>
+<tr><th>property</th><th>description</th><th>default</th><th>required?</th></tr>
+</thead>
+<tbody>
+<tr><td>type</td><td>This should always be <code>dynamic</code></td><td>none</td><td>yes</td></tr>
+<tr><td>maxRowsPerSegment</td><td>Used in sharding. Determines how many rows are in each segment.</td><td>5000000</td><td>no</td></tr>
+<tr><td>maxTotalRows</td><td>Total number of rows in segments waiting for being pushed.</td><td>20000000</td><td>no</td></tr>
+</tbody>
+</table>
+<h3><a class="anchor" aria-hidden="true" id="segmentwriteoutmediumfactory"></a><a href="#segmentwriteoutmediumfactory" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a><code>segmentWriteOutMediumFactory</code></h3>
+<table>
+<thead>
+<tr><th>Field</th><th>Type</th><th>Description</th><th>Required</th></tr>
+</thead>
+<tbody>
+<tr><td>type</td><td>String</td><td>See <a href="/docs/0.20.0/configuration/index.html#segmentwriteoutmediumfactory">Additional Peon Configuration: SegmentWriteOutMediumFactory</a> for explanation and available options.</td><td>yes</td></tr>
+</tbody>
+</table>
+<h3><a class="anchor" aria-hidden="true" id="segment-pushing-modes"></a><a href="#segment-pushing-modes" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Segment pushing modes</h3>
+<p>While ingesting data using the Index task, it creates segments from the input data and pushes them. For segment pushing,
+the Index task supports two segment pushing modes, i.e., <em>bulk pushing mode</em> and <em>incremental pushing mode</em> for
+<a href="/docs/0.20.0/ingestion/index.html#rollup">perfect rollup and best-effort rollup</a>, respectively.</p>
+<p>In the bulk pushing mode, every segment is pushed at the very end of the index task. Until then, created segments
+are stored in the memory and local storage of the process running the index task. As a result, this mode might cause a
+problem due to limited storage capacity, and is not recommended to use in production.</p>
+<p>On the contrary, in the incremental pushing mode, segments are incrementally pushed, that is they can be pushed
+in the middle of the index task. More precisely, the index task collects data and stores created segments in the memory
+and disks of the process running that task until the total number of collected rows exceeds <code>maxTotalRows</code>. Once it exceeds,
+the index task immediately pushes all segments created until that moment, cleans all pushed segments up, and
+continues to ingest remaining data.</p>
+<p>To enable bulk pushing mode, <code>forceGuaranteedRollup</code> should be set in the TuningConfig. Note that this option cannot
+be used with <code>appendToExisting</code> of IOConfig.</p>
+<h2><a class="anchor" aria-hidden="true" id="input-sources"></a><a href="#input-sources" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Input Sources</h2>
+<p>The input source is the place to define from where your index task reads data.
+Only the native Parallel task and Simple task support the input source.</p>
+<h3><a class="anchor" aria-hidden="true" id="s3-input-source"></a><a href="#s3-input-source" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>S3 Input Source</h3>
+<blockquote>
+<p>You need to include the <a href="/docs/0.20.0/development/extensions-core/s3.html"><code>druid-s3-extensions</code></a> as an extension to use the S3 input source.</p>
+</blockquote>
+<p>The S3 input source is to support reading objects directly from S3.
+Objects can be specified either via a list of S3 URI strings or a list of
+S3 location prefixes, which will attempt to list the contents and ingest
+all objects contained in the locations. The S3 input source is splittable
+and can be used by the <a href="#parallel-task">Parallel task</a>,
+where each worker task of <code>index_parallel</code> will read one or multiple objects.</p>
+<p>Sample specs:</p>
+<pre><code class="hljs css language-json">...
+    "ioConfig": {
+      "type": "index_parallel",
+      "inputSource": {
+        "type": "s3",
+        "uris": ["s3://foo/bar/file.json", "s3://bar/foo/file2.json"]
+      },
+      "inputFormat": {
+        "type": "json"
+      },
+      ...
+    },
+...
+</code></pre>
+<pre><code class="hljs css language-json">...
+    "ioConfig": {
+      "type": "index_parallel",
+      "inputSource": {
+        "type": "s3",
+        "prefixes": ["s3://foo/bar", "s3://bar/foo"]
+      },
+      "inputFormat": {
+        "type": "json"
+      },
+      ...
+    },
+...
+</code></pre>
+<pre><code class="hljs css language-json">...
+    "ioConfig": {
+      "type": "index_parallel",
+      "inputSource": {
+        "type": "s3",
+        "objects": [
+          { "bucket": "foo", "path": "bar/file1.json"},
+          { "bucket": "bar", "path": "foo/file2.json"}
+        ]
+      },
+      "inputFormat": {
+        "type": "json"
+      },
+      ...
+    },
+...
+</code></pre>
+<table>
+<thead>
+<tr><th>property</th><th>description</th><th>default</th><th>required?</th></tr>
+</thead>
+<tbody>
+<tr><td>type</td><td>This should be <code>s3</code>.</td><td>None</td><td>yes</td></tr>
+<tr><td>uris</td><td>JSON array of URIs where S3 objects to be ingested are located.</td><td>None</td><td><code>uris</code> or <code>prefixes</code> or <code>objects</code> must be set</td></tr>
+<tr><td>prefixes</td><td>JSON array of URI prefixes for the locations of S3 objects to be ingested. Empty objects starting with one of the given prefixes will be skipped.</td><td>None</td><td><code>uris</code> or <code>prefixes</code> or <code>objects</code> must be set</td></tr>
+<tr><td>objects</td><td>JSON array of S3 Objects to be ingested.</td><td>None</td><td><code>uris</code> or <code>prefixes</code> or <code>objects</code> must be set</td></tr>
+<tr><td>properties</td><td>Properties Object for overriding the default S3 configuration. See below for more information.</td><td>None</td><td>No (defaults will be used if not given)</td></tr>
+</tbody>
+</table>
+<p>Note that the S3 input source will skip all empty objects only when <code>prefixes</code> is specified.</p>
+<p>S3 Object:</p>
+<table>
+<thead>
+<tr><th>property</th><th>description</th><th>default</th><th>required?</th></tr>
+</thead>
+<tbody>
+<tr><td>bucket</td><td>Name of the S3 bucket</td><td>None</td><td>yes</td></tr>
+<tr><td>path</td><td>The path where data is located.</td><td>None</td><td>yes</td></tr>
+</tbody>
+</table>
+<p>Properties Object:</p>
+<table>
+<thead>
+<tr><th>property</th><th>description</th><th>default</th><th>required?</th></tr>
+</thead>
+<tbody>
+<tr><td>accessKeyId</td><td>The <a href="/docs/0.20.0/operations/password-provider.html">Password Provider</a> or plain text string of this S3 InputSource's access key</td><td>None</td><td>yes if secretAccessKey is given</td></tr>
+<tr><td>secretAccessKey</td><td>The <a href="/docs/0.20.0/operations/password-provider.html">Password Provider</a> or plain text string of this S3 InputSource's secret key</td><td>None</td><td>yes if accessKeyId is given</td></tr>
+</tbody>
+</table>
+<p><strong>Note :</strong> <em>If accessKeyId and secretAccessKey are not given, the default <a href="/docs/0.20.0/development/extensions-core/s3.html#s3-authentication-methods">S3 credentials provider chain</a> is used.</em></p>
+<h3><a class="anchor" aria-hidden="true" id="google-cloud-storage-input-source"></a><a href="#google-cloud-storage-input-source" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Google Cloud Storage Input Source</h3>
+<blockquote>
+<p>You need to include the <a href="/docs/0.20.0/development/extensions-core/google.html"><code>druid-google-extensions</code></a> as an extension to use the Google Cloud Storage input source.</p>
+</blockquote>
+<p>The Google Cloud Storage input source is to support reading objects directly
+from Google Cloud Storage. Objects can be specified as list of Google
+Cloud Storage URI strings. The Google Cloud Storage input source is splittable
+and can be used by the <a href="#parallel-task">Parallel task</a>, where each worker task of <code>index_parallel</code> will read
+one or multiple objects.</p>
+<p>Sample specs:</p>
+<pre><code class="hljs css language-json">...
+    "ioConfig": {
+      "type": "index_parallel",
+      "inputSource": {
+        "type": "google",
+        "uris": ["gs://foo/bar/file.json", "gs://bar/foo/file2.json"]
+      },
+      "inputFormat": {
+        "type": "json"
+      },
+      ...
+    },
+...
+</code></pre>
+<pre><code class="hljs css language-json">...
+    "ioConfig": {
+      "type": "index_parallel",
+      "inputSource": {
+        "type": "google",
+        "prefixes": ["gs://foo/bar", "gs://bar/foo"]
+      },
+      "inputFormat": {
+        "type": "json"
+      },
+      ...
+    },
+...
+</code></pre>
+<pre><code class="hljs css language-json">...
+    "ioConfig": {
+      "type": "index_parallel",
+      "inputSource": {
+        "type": "google",
+        "objects": [
+          { "bucket": "foo", "path": "bar/file1.json"},
+          { "bucket": "bar", "path": "foo/file2.json"}
+        ]
+      },
+      "inputFormat": {
+        "type": "json"
+      },
+      ...
+    },
+...
+</code></pre>
+<table>
+<thead>
+<tr><th>property</th><th>description</th><th>default</th><th>required?</th></tr>
+</thead>
+<tbody>
+<tr><td>type</td><td>This should be <code>google</code>.</td><td>None</td><td>yes</td></tr>
+<tr><td>uris</td><td>JSON array of URIs where Google Cloud Storage objects to be ingested are located.</td><td>None</td><td><code>uris</code> or <code>prefixes</code> or <code>objects</code> must be set</td></tr>
+<tr><td>prefixes</td><td>JSON array of URI prefixes for the locations of Google Cloud Storage objects to be ingested. Empty objects starting with one of the given prefixes will be skipped.</td><td>None</td><td><code>uris</code> or <code>prefixes</code> or <code>objects</code> must be set</td></tr>
+<tr><td>objects</td><td>JSON array of Google Cloud Storage objects to be ingested.</td><td>None</td><td><code>uris</code> or <code>prefixes</code> or <code>objects</code> must be set</td></tr>
+</tbody>
+</table>
+<p>Note that the Google Cloud Storage input source will skip all empty objects only when <code>prefixes</code> is specified.</p>
+<p>Google Cloud Storage object:</p>
+<table>
+<thead>
+<tr><th>property</th><th>description</th><th>default</th><th>required?</th></tr>
+</thead>
+<tbody>
+<tr><td>bucket</td><td>Name of the Google Cloud Storage bucket</td><td>None</td><td>yes</td></tr>
+<tr><td>path</td><td>The path where data is located.</td><td>None</td><td>yes</td></tr>
+</tbody>
+</table>
+<h3><a class="anchor" aria-hidden="true" id="azure-input-source"></a><a href="#azure-input-source" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Azure Input Source</h3>
+<blockquote>
+<p>You need to include the <a href="/docs/0.20.0/development/extensions-core/azure.html"><code>druid-azure-extensions</code></a> as an extension to use the Azure input source.</p>
+</blockquote>
+<p>The Azure input source is to support reading objects directly from Azure Blob store. Objects can be
+specified as list of Azure Blob store URI strings. The Azure input source is splittable and can be used
+by the <a href="#parallel-task">Parallel task</a>, where each worker task of <code>index_parallel</code> will read
+a single object.</p>
+<p>Sample specs:</p>
+<pre><code class="hljs css language-json">...
+    "ioConfig": {
+      "type": "index_parallel",
+      "inputSource": {
+        "type": "azure",
+        "uris": ["azure://container/prefix1/file.json", "azure://container/prefix2/file2.json"]
+      },
+      "inputFormat": {
+        "type": "json"
+      },
+      ...
+    },
+...
+</code></pre>
+<pre><code class="hljs css language-json">...
+    "ioConfig": {
+      "type": "index_parallel",
+      "inputSource": {
+        "type": "azure",
+        "prefixes": ["azure://container/prefix1", "azure://container/prefix2"]
+      },
+      "inputFormat": {
+        "type": "json"
+      },
+      ...
+    },
+...
+</code></pre>
+<pre><code class="hljs css language-json">...
+    "ioConfig": {
+      "type": "index_parallel",
+      "inputSource": {
+        "type": "azure",
+        "objects": [
+          { "bucket": "container", "path": "prefix1/file1.json"},
+          { "bucket": "container", "path": "prefix2/file2.json"}
+        ]
+      },
+      "inputFormat": {
+        "type": "json"
+      },
+      ...
+    },
+...
+</code></pre>
+<table>
+<thead>
+<tr><th>property</th><th>description</th><th>default</th><th>required?</th></tr>
+</thead>
+<tbody>
+<tr><td>type</td><td>This should be <code>azure</code>.</td><td>None</td><td>yes</td></tr>
+<tr><td>uris</td><td>JSON array of URIs where Azure Blob objects to be ingested are located. Should be in form &quot;azure://&lt;container&gt;/&lt;path-to-file&gt;&quot;</td><td>None</td><td><code>uris</code> or <code>prefixes</code> or <code>objects</code> must be set</td></tr>
+<tr><td>prefixes</td><td>JSON array of URI prefixes for the locations of Azure Blob objects to be ingested. Should be in the form &quot;azure://&lt;container&gt;/&lt;prefix&gt;&quot;. Empty objects starting with one of the given prefixes will be skipped.</td><td>None</td><td><code>uris</code> or <code>prefixes</code> or <code>objects</code> must be set</td></tr>
+<tr><td>objects</td><td>JSON array of Azure Blob objects to be ingested.</td><td>None</td><td><code>uris</code> or <code>prefixes</code> or <code>objects</code> must be set</td></tr>
+</tbody>
+</table>
+<p>Note that the Azure input source will skip all empty objects only when <code>prefixes</code> is specified.</p>
+<p>Azure Blob object:</p>
+<table>
+<thead>
+<tr><th>property</th><th>description</th><th>default</th><th>required?</th></tr>
+</thead>
+<tbody>
+<tr><td>bucket</td><td>Name of the Azure Blob Storage container</td><td>None</td><td>yes</td></tr>
+<tr><td>path</td><td>The path where data is located.</td><td>None</td><td>yes</td></tr>
+</tbody>
+</table>
+<h3><a class="anchor" aria-hidden="true" id="hdfs-input-source"></a><a href="#hdfs-input-source" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>HDFS Input Source</h3>
+<blockquote>
+<p>You need to include the <a href="/docs/0.20.0/development/extensions-core/hdfs.html"><code>druid-hdfs-storage</code></a> as an extension to use the HDFS input source.</p>
+</blockquote>
+<p>The HDFS input source is to support reading files directly
+from HDFS storage. File paths can be specified as an HDFS URI string or a list
+of HDFS URI strings. The HDFS input source is splittable and can be used by the <a href="#parallel-task">Parallel task</a>,
+where each worker task of <code>index_parallel</code> will read one or multiple files.</p>
+<p>Sample specs:</p>
+<pre><code class="hljs css language-json">...
+    "ioConfig": {
+      "type": "index_parallel",
+      "inputSource": {
+        "type": "hdfs",
+        "paths": "hdfs://foo/bar/", "hdfs://bar/foo"
+      },
+      "inputFormat": {
+        "type": "json"
+      },
+      ...
+    },
+...
+</code></pre>
+<pre><code class="hljs css language-json">...
+    "ioConfig": {
+      "type": "index_parallel",
+      "inputSource": {
+        "type": "hdfs",
+        "paths": ["hdfs://foo/bar", "hdfs://bar/foo"]
+      },
+      "inputFormat": {
+        "type": "json"
+      },
+      ...
+    },
+...
+</code></pre>
+<pre><code class="hljs css language-json">...
+    "ioConfig": {
+      "type": "index_parallel",
+      "inputSource": {
+        "type": "hdfs",
+        "paths": "hdfs://foo/bar/file.json", "hdfs://bar/foo/file2.json"
+      },
+      "inputFormat": {
+        "type": "json"
+      },
+      ...
+    },
+...
+</code></pre>
+<pre><code class="hljs css language-json">...
+    "ioConfig": {
+      "type": "index_parallel",
+      "inputSource": {
+        "type": "hdfs",
+        "paths": ["hdfs://foo/bar/file.json", "hdfs://bar/foo/file2.json"]
+      },
+      "inputFormat": {
+        "type": "json"
+      },
+      ...
+    },
+...
+</code></pre>
+<table>
+<thead>
+<tr><th>property</th><th>description</th><th>default</th><th>required?</th></tr>
+</thead>
+<tbody>
+<tr><td>type</td><td>This should be <code>hdfs</code>.</td><td>None</td><td>yes</td></tr>
+<tr><td>paths</td><td>HDFS paths. Can be either a JSON array or comma-separated string of paths. Wildcards like <code>*</code> are supported in these paths. Empty files located under one of the given paths will be skipped.</td><td>None</td><td>yes</td></tr>
+</tbody>
+</table>
+<p>You can also ingest from cloud storage using the HDFS input source.
+However, if you want to read from AWS S3 or Google Cloud Storage, consider using
+the <a href="#s3-input-source">S3 input source</a> or the <a href="#google-cloud-storage-input-source">Google Cloud Storage input source</a> instead.</p>
+<h3><a class="anchor" aria-hidden="true" id="http-input-source"></a><a href="#http-input-source" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>HTTP Input Source</h3>
+<p>The HTTP input source is to support reading files directly
+from remote sites via HTTP.
+The HTTP input source is <em>splittable</em> and can be used by the <a href="#parallel-task">Parallel task</a>,
+where each worker task of <code>index_parallel</code> will read only one file.</p>
+<p>Sample specs:</p>
+<pre><code class="hljs css language-json">...
+    "ioConfig": {
+      "type": "index_parallel",
+      "inputSource": {
+        "type": "http",
+        "uris": ["http://example.com/uri1", "http://example2.com/uri2"]
+      },
+      "inputFormat": {
+        "type": "json"
+      },
+      ...
+    },
+...
+</code></pre>
+<p>Example with authentication fields using the DefaultPassword provider (this requires the password to be in the ingestion spec):</p>
+<pre><code class="hljs css language-json">...
+    "ioConfig": {
+      "type": "index_parallel",
+      "inputSource": {
+        "type": "http",
+        "uris": ["http://example.com/uri1", "http://example2.com/uri2"],
+        "httpAuthenticationUsername": "username",
+        "httpAuthenticationPassword": "password123"
+      },
+      "inputFormat": {
+        "type": "json"
+      },
+      ...
+    },
+...
+</code></pre>
+<p>You can also use the other existing Druid PasswordProviders. Here is an example using the EnvironmentVariablePasswordProvider:</p>
+<pre><code class="hljs css language-json">...
+    "ioConfig": {
+      "type": "index_parallel",
+      "inputSource": {
+        "type": "http",
+        "uris": ["http://example.com/uri1", "http://example2.com/uri2"],
+        "httpAuthenticationUsername": "username",
+        "httpAuthenticationPassword": {
+          "type": "environment",
+          "variable": "HTTP_INPUT_SOURCE_PW"
+        }
+      },
+      "inputFormat": {
+        "type": "json"
+      },
+      ...
+    },
+...
+}
+</code></pre>
+<table>
+<thead>
+<tr><th>property</th><th>description</th><th>default</th><th>required?</th></tr>
+</thead>
+<tbody>
+<tr><td>type</td><td>This should be <code>http</code></td><td>None</td><td>yes</td></tr>
+<tr><td>uris</td><td>URIs of the input files.</td><td>None</td><td>yes</td></tr>
+<tr><td>httpAuthenticationUsername</td><td>Username to use for authentication with specified URIs. Can be optionally used if the URIs specified in the spec require a Basic Authentication Header.</td><td>None</td><td>no</td></tr>
+<tr><td>httpAuthenticationPassword</td><td>PasswordProvider to use with specified URIs. Can be optionally used if the URIs specified in the spec require a Basic Authentication Header.</td><td>None</td><td>no</td></tr>
+</tbody>
+</table>
+<h3><a class="anchor" aria-hidden="true" id="inline-input-source"></a><a href="#inline-input-source" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Inline Input Source</h3>
+<p>The Inline input source can be used to read the data inlined in its own spec.
+It can be used for demos or for quickly testing out parsing and schema.</p>
+<p>Sample spec:</p>
+<pre><code class="hljs css language-json">...
+    "ioConfig": {
+      "type": "index_parallel",
+      "inputSource": {
+        "type": "inline",
+        "data": "0,values,formatted\n1,as,CSV"
+      },
+      "inputFormat": {
+        "type": "csv"
+      },
+      ...
+    },
+...
+</code></pre>
+<table>
+<thead>
+<tr><th>property</th><th>description</th><th>required?</th></tr>
+</thead>
+<tbody>
+<tr><td>type</td><td>This should be &quot;inline&quot;.</td><td>yes</td></tr>
+<tr><td>data</td><td>Inlined data to ingest.</td><td>yes</td></tr>
+</tbody>
+</table>
+<h3><a class="anchor" aria-hidden="true" id="local-input-source"></a><a href="#local-input-source" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Local Input Source</h3>
+<p>The Local input source is to support reading files directly from local storage,
+and is mainly intended for proof-of-concept testing.
+The Local input source is <em>splittable</em> and can be used by the <a href="#parallel-task">Parallel task</a>,
+where each worker task of <code>index_parallel</code> will read one or multiple files.</p>
+<p>Sample spec:</p>
+<pre><code class="hljs css language-json">...
+    "ioConfig": {
+      "type": "index_parallel",
+      "inputSource": {
+        "type": "local",
+        "filter" : "*.csv",
+        "baseDir": "/data/directory",
+        "files": ["/bar/foo", "/foo/bar"]
+      },
+      "inputFormat": {
+        "type": "csv"
+      },
+      ...
+    },
+...
+</code></pre>
+<table>
+<thead>
+<tr><th>property</th><th>description</th><th>required?</th></tr>
+</thead>
+<tbody>
+<tr><td>type</td><td>This should be &quot;local&quot;.</td><td>yes</td></tr>
+<tr><td>filter</td><td>A wildcard filter for files. See <a href="http://commons.apache.org/proper/commons-io/apidocs/org/apache/commons/io/filefilter/WildcardFileFilter.html">here</a> for more information.</td><td>yes if <code>baseDir</code> is specified</td></tr>
+<tr><td>baseDir</td><td>Directory to search recursively for files to be ingested. Empty files under the <code>baseDir</code> will be skipped.</td><td>At least one of <code>baseDir</code> or <code>files</code> should be specified</td></tr>
+<tr><td>files</td><td>File paths to ingest. Some files can be ignored to avoid ingesting duplicate files if they are located under the specified <code>baseDir</code>. Empty files will be skipped.</td><td>At least one of <code>baseDir</code> or <code>files</code> should be specified</td></tr>
+</tbody>
+</table>
+<h3><a class="anchor" aria-hidden="true" id="druid-input-source"></a><a href="#druid-input-source" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Druid Input Source</h3>
+<p>The Druid input source is to support reading data directly from existing Druid segments,
+potentially using a new schema and changing the name, dimensions, metrics, rollup, etc. of the segment.
+The Druid input source is <em>splittable</em> and can be used by the <a href="#parallel-task">Parallel task</a>.
+This input source has a fixed input format for reading from Druid segments;
+no <code>inputFormat</code> field needs to be specified in the ingestion spec when using this input source.</p>
+<table>
+<thead>
+<tr><th>property</th><th>description</th><th>required?</th></tr>
+</thead>
+<tbody>
+<tr><td>type</td><td>This should be &quot;druid&quot;.</td><td>yes</td></tr>
+<tr><td>dataSource</td><td>A String defining the Druid datasource to fetch rows from</td><td>yes</td></tr>
+<tr><td>interval</td><td>A String representing an ISO-8601 interval, which defines the time range to fetch the data over.</td><td>yes</td></tr>
+<tr><td>dimensions</td><td>A list of Strings containing the names of dimension columns to select from the Druid datasource. If the list is empty, no dimensions are returned. If null, all dimensions are returned.</td><td>no</td></tr>
+<tr><td>metrics</td><td>The list of Strings containing the names of metric columns to select. If the list is empty, no metrics are returned. If null, all metrics are returned.</td><td>no</td></tr>
+<tr><td>filter</td><td>See <a href="/docs/0.20.0/querying/filters.html">Filters</a>. Only rows that match the filter, if specified, will be returned.</td><td>no</td></tr>
+</tbody>
+</table>
+<p>A minimal example DruidInputSource spec is shown below:</p>
+<pre><code class="hljs css language-json">...
+    "ioConfig": {
+      "type": "index_parallel",
+      "inputSource": {
+        "type": "druid",
+        "dataSource": "wikipedia",
+        "interval": "2013-01-01/2013-01-02"
+      }
+      ...
+    },
+...
+</code></pre>
+<p>The spec above will read all existing dimension and metric columns from
+the <code>wikipedia</code> datasource, including all rows with a timestamp (the <code>__time</code> column)
+within the interval <code>2013-01-01/2013-01-02</code>.</p>
+<p>A spec that applies a filter and reads a subset of the original datasource's columns is shown below.</p>
+<pre><code class="hljs css language-json">...
+    "ioConfig": {
+      "type": "index_parallel",
+      "inputSource": {
+        "type": "druid",
+        "dataSource": "wikipedia",
+        "interval": "2013-01-01/2013-01-02",
+        "dimensions": [
+          "page",
+          "user"
+        ],
+        "metrics": [
+          "added"
+        ],
+        "filter": {
+          "type": "selector",
+          "dimension": "page",
+          "value": "Druid"
+        }
+      }
+      ...
+    },
+...
+</code></pre>
+<p>This spec above will only return the <code>page</code>, <code>user</code> dimensions and <code>added</code> metric.
+Only rows where <code>page</code> = <code>Druid</code> will be returned.</p>
+<h3><a class="anchor" aria-hidden="true" id="sql-input-source"></a><a href="#sql-input-source" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>SQL Input Source</h3>
+<p>The SQL input source is used to read data directly from RDBMS.
+The SQL input source is <em>splittable</em> and can be used by the <a href="#parallel-task">Parallel task</a>, where each worker task will read from one SQL query from the list of queries.
+Since this input source has a fixed input format for reading events, no <code>inputFormat</code> field needs to be specified in the ingestion spec when using this input source.
+Please refer to the Recommended practices section below before using this input source.</p>
+<table>
+<thead>
+<tr><th>property</th><th>description</th><th>required?</th></tr>
+</thead>
+<tbody>
+<tr><td>type</td><td>This should be &quot;sql&quot;.</td><td>Yes</td></tr>
+<tr><td>database</td><td>Specifies the database connection details. The database type corresponds to the extension that supplies the <code>connectorConfig</code> support and this extension must be loaded into Druid. For database types <code>mysql</code> and <code>postgresql</code>, the <code>connectorConfig</code> support is provided by <a href="/docs/0.20.0/development/extensions-core/mysql.html">mysql-metadata-storage</a> and <a href="/docs/0.20.0/development/extensions-core/postgresql.html">postgresql-metadata-storage</a> extensions respectively.</td><td>Yes</td></tr>
+<tr><td>foldCase</td><td>Toggle case folding of database column names. This may be enabled in cases where the database returns case insensitive column names in query results.</td><td>No</td></tr>
+<tr><td>sqls</td><td>List of SQL queries where each SQL query would retrieve the data to be indexed.</td><td>Yes</td></tr>
+</tbody>
+</table>
+<p>An example SqlInputSource spec is shown below:</p>
+<pre><code class="hljs css language-json">...
+    "ioConfig": {
+      "type": "index_parallel",
+      "inputSource": {
+        "type": "sql",
+        "database": {
+            "type": "mysql",
+            "connectorConfig": {
+                "connectURI": "jdbc:mysql://host:port/schema",
+                "user": "user",
+                "password": "password"
+            }
+        },
+        "sqls": ["SELECT * FROM table1 WHERE timestamp BETWEEN '2013-01-01 00:00:00' AND '2013-01-01 11:59:59'", "SELECT * FROM table2 WHERE timestamp BETWEEN '2013-01-01 00:00:00' AND '2013-01-01 11:59:59'"]
+      }
+    },
+...
+</code></pre>
+<p>The spec above will read all events from two separate SQLs for the interval <code>2013-01-01/2013-01-02</code>.
+Each of the SQL queries will be run in its own sub-task and thus for the above example, there would be two sub-tasks.</p>
+<p><strong>Recommended practices</strong></p>
+<p>Compared to the other native batch InputSources, SQL InputSource behaves differently in terms of reading the input data and so it would be helpful to consider the following points before using this InputSource in a production environment:</p>
+<ul>
+<li><p>During indexing, each sub-task would execute one of the SQL queries and the results are stored locally on disk. The sub-tasks then proceed to read the data from these local input files and generate segments. Presently, there isn’t any restriction on the size of the generated files and this would require the MiddleManagers or Indexers to have sufficient disk capacity based on the volume of data being indexed.</p></li>
+<li><p>Filtering the SQL queries based on the intervals specified in the <code>granularitySpec</code> can avoid unwanted data being retrieved and stored locally by the indexing sub-tasks. For example, if the <code>intervals</code> specified in the <code>granularitySpec</code> is <code>[&quot;2013-01-01/2013-01-02&quot;]</code> and the SQL query is <code>SELECT * FROM table1</code>, <code>SqlInputSource</code> will read all the data for <code>table1</code> based on the query, even though only data between the intervals specified will be indexed into Druid.</p></li>
+<li><p>Pagination may be used on the SQL queries to ensure that each query pulls a similar amount of data, thereby improving the efficiency of the sub-tasks.</p></li>
+<li><p>Similar to file-based input formats, any updates to existing data will replace the data in segments specific to the intervals specified in the <code>granularitySpec</code>.</p></li>
+</ul>
+<h3><a class="anchor" aria-hidden="true" id="combining-input-source"></a><a href="#combining-input-source" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Combining Input Source</h3>
+<p>The Combining input source is used to read data from multiple InputSources. This input source should be only used if all the delegate input sources are
+<em>splittable</em> and can be used by the <a href="#parallel-task">Parallel task</a>. This input source will identify the splits from its delegates and each split will be processed by a worker task. Similar to other input sources, this input source supports a single <code>inputFormat</code>. Therefore, please note that delegate input sources requiring an <code>inputFormat</code> must have the same format for input data.</p>
+<table>
+<thead>
+<tr><th>property</th><th>description</th><th>required?</th></tr>
+</thead>
+<tbody>
+<tr><td>type</td><td>This should be &quot;combining&quot;.</td><td>Yes</td></tr>
+<tr><td>delegates</td><td>List of <em>splittable</em> InputSources to read data from.</td><td>Yes</td></tr>
+</tbody>
+</table>
+<p>Sample spec:</p>
+<pre><code class="hljs css language-json">...
+    "ioConfig": {
+      "type": "index_parallel",
+      "inputSource": {
+        "type": "combining",
+        "delegates" : [
+         {
+          "type": "local",
+          "filter" : "*.csv",
+          "baseDir": "/data/directory",
+          "files": ["/bar/foo", "/foo/bar"]
+         },
+         {
+          "type": "druid",
+          "dataSource": "wikipedia",
+          "interval": "2013-01-01/2013-01-02"
+         }
+        ]
+      },
+      "inputFormat": {
+        "type": "csv"
+      },
+      ...
+    },
+...
+</code></pre>
+<h3></h3>
+<h2><a class="anchor" aria-hidden="true" id="firehoses-deprecated"></a><a href="#firehoses-deprecated" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Firehoses (Deprecated)</h2>
+<p>Firehoses are deprecated in 0.17.0. It's highly recommended to use the <a href="#input-sources">Input source</a> instead.
+There are several firehoses readily available in Druid, some are meant for examples, others can be used directly in a production environment.</p>
+<h3><a class="anchor" aria-hidden="true" id="statics3firehose"></a><a href="#statics3firehose" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>StaticS3Firehose</h3>
+<blockquote>
+<p>You need to include the <a href="/docs/0.20.0/development/extensions-core/s3.html"><code>druid-s3-extensions</code></a> as an extension to use the StaticS3Firehose.</p>
+</blockquote>
+<p>This firehose ingests events from a predefined list of S3 objects.
+This firehose is <em>splittable</em> and can be used by the <a href="#parallel-task">Parallel task</a>.
+Since each split represents an object in this firehose, each worker task of <code>index_parallel</code> will read an object.</p>
+<p>Sample spec:</p>
+<pre><code class="hljs css language-json">"firehose" : {
+    "type" : "static-s3",
+    "uris": ["s3://foo/bar/file.gz", "s3://bar/foo/file2.gz"]
+}
+</code></pre>
+<p>This firehose provides caching and prefetching features. In the Simple task, a firehose can be read twice if intervals or
+shardSpecs are not specified, and, in this case, caching can be useful. Prefetching is preferred when direct scan of objects is slow.
+Note that prefetching or caching isn't that useful in the Parallel task.</p>
+<table>
+<thead>
+<tr><th>property</th><th>description</th><th>default</th><th>required?</th></tr>
+</thead>
+<tbody>
+<tr><td>type</td><td>This should be <code>static-s3</code>.</td><td>None</td><td>yes</td></tr>
+<tr><td>uris</td><td>JSON array of URIs where s3 files to be ingested are located.</td><td>None</td><td><code>uris</code> or <code>prefixes</code> must be set</td></tr>
+<tr><td>prefixes</td><td>JSON array of URI prefixes for the locations of s3 files to be ingested.</td><td>None</td><td><code>uris</code> or <code>prefixes</code> must be set</td></tr>
+<tr><td>maxCacheCapacityBytes</td><td>Maximum size of the cache space in bytes. 0 means disabling cache. Cached files are not removed until the ingestion task completes.</td><td>1073741824</td><td>no</td></tr>
+<tr><td>maxFetchCapacityBytes</td><td>Maximum size of the fetch space in bytes. 0 means disabling prefetch. Prefetched files are removed immediately once they are read.</td><td>1073741824</td><td>no</td></tr>
+<tr><td>prefetchTriggerBytes</td><td>Threshold to trigger prefetching s3 objects.</td><td>maxFetchCapacityBytes / 2</td><td>no</td></tr>
+<tr><td>fetchTimeout</td><td>Timeout for fetching an s3 object.</td><td>60000</td><td>no</td></tr>
+<tr><td>maxFetchRetry</td><td>Maximum retry for fetching an s3 object.</td><td>3</td><td>no</td></tr>
+</tbody>
+</table>
+<h4><a class="anchor" aria-hidden="true" id="staticgoogleblobstorefirehose"></a><a href="#staticgoogleblobstorefirehose" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>StaticGoogleBlobStoreFirehose</h4>
+<blockquote>
+<p>You need to include the <a href="/docs/0.20.0/development/extensions-core/google.html"><code>druid-google-extensions</code></a> as an extension to use the StaticGoogleBlobStoreFirehose.</p>
+</blockquote>
+<p>This firehose ingests events, similar to the StaticS3Firehose, but from an Google Cloud Store.</p>
+<p>As with the S3 blobstore, it is assumed to be gzipped if the extension ends in .gz</p>
+<p>This firehose is <em>splittable</em> and can be used by the <a href="#parallel-task">Parallel task</a>.
+Since each split represents an object in this firehose, each worker task of <code>index_parallel</code> will read an object.</p>
+<p>Sample spec:</p>
+<pre><code class="hljs css language-json">"firehose" : {
+    "type" : "static-google-blobstore",
+    "blobs": [
+        {
+          "bucket": "foo",
+          "path": "/path/to/your/file.json"
+        },
+        {
+          "bucket": "bar",
+          "path": "/another/path.json"
+        }
+    ]
+}
+</code></pre>
+<p>This firehose provides caching and prefetching features. In the Simple task, a firehose can be read twice if intervals or
+shardSpecs are not specified, and, in this case, caching can be useful. Prefetching is preferred when direct scan of objects is slow.
+Note that prefetching or caching isn't that useful in the Parallel task.</p>
+<table>
+<thead>
+<tr><th>property</th><th>description</th><th>default</th><th>required?</th></tr>
+</thead>
+<tbody>
+<tr><td>type</td><td>This should be <code>static-google-blobstore</code>.</td><td>None</td><td>yes</td></tr>
+<tr><td>blobs</td><td>JSON array of Google Blobs.</td><td>None</td><td>yes</td></tr>
+<tr><td>maxCacheCapacityBytes</td><td>Maximum size of the cache space in bytes. 0 means disabling cache. Cached files are not removed until the ingestion task completes.</td><td>1073741824</td><td>no</td></tr>
+<tr><td>maxFetchCapacityBytes</td><td>Maximum size of the fetch space in bytes. 0 means disabling prefetch. Prefetched files are removed immediately once they are read.</td><td>1073741824</td><td>no</td></tr>
+<tr><td>prefetchTriggerBytes</td><td>Threshold to trigger prefetching Google Blobs.</td><td>maxFetchCapacityBytes / 2</td><td>no</td></tr>
+<tr><td>fetchTimeout</td><td>Timeout for fetching a Google Blob.</td><td>60000</td><td>no</td></tr>
+<tr><td>maxFetchRetry</td><td>Maximum retry for fetching a Google Blob.</td><td>3</td><td>no</td></tr>
+</tbody>
+</table>
+<p>Google Blobs:</p>
+<table>
+<thead>
+<tr><th>property</th><th>description</th><th>default</th><th>required?</th></tr>
+</thead>
+<tbody>
+<tr><td>bucket</td><td>Name of the Google Cloud bucket</td><td>None</td><td>yes</td></tr>
+<tr><td>path</td><td>The path where data is located.</td><td>None</td><td>yes</td></tr>
+</tbody>
+</table>
+<h3><a class="anchor" aria-hidden="true" id="hdfsfirehose"></a><a href="#hdfsfirehose" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>HDFSFirehose</h3>
+<blockquote>
+<p>You need to include the <a href="/docs/0.20.0/development/extensions-core/hdfs.html"><code>druid-hdfs-storage</code></a> as an extension to use the HDFSFirehose.</p>
+</blockquote>
+<p>This firehose ingests events from a predefined list of files from the HDFS storage.
+This firehose is <em>splittable</em> and can be used by the <a href="#parallel-task">Parallel task</a>.
+Since each split represents an HDFS file, each worker task of <code>index_parallel</code> will read files.</p>
+<p>Sample spec:</p>
+<pre><code class="hljs css language-json">"firehose" : {
+    "type" : "hdfs",
+    "paths": "/foo/bar,/foo/baz"
+}
+</code></pre>
+<p>This firehose provides caching and prefetching features. During native batch indexing, a firehose can be read twice if
+<code>intervals</code> are not specified, and, in this case, caching can be useful. Prefetching is preferred when direct scanning
+of files is slow.
+Note that prefetching or caching isn't that useful in the Parallel task.</p>
+<table>
+<thead>
+<tr><th>Property</th><th>Description</th><th>Default</th></tr>
+</thead>
+<tbody>
+<tr><td>type</td><td>This should be <code>hdfs</code>.</td><td>none (required)</td></tr>
+<tr><td>paths</td><td>HDFS paths. Can be either a JSON array or comma-separated string of paths. Wildcards like <code>*</code> are supported in these paths.</td><td>none (required)</td></tr>
+<tr><td>maxCacheCapacityBytes</td><td>Maximum size of the cache space in bytes. 0 means disabling cache. Cached files are not removed until the ingestion task completes.</td><td>1073741824</td></tr>
+<tr><td>maxFetchCapacityBytes</td><td>Maximum size of the fetch space in bytes. 0 means disabling prefetch. Prefetched files are removed immediately once they are read.</td><td>1073741824</td></tr>
+<tr><td>prefetchTriggerBytes</td><td>Threshold to trigger prefetching files.</td><td>maxFetchCapacityBytes / 2</td></tr>
+<tr><td>fetchTimeout</td><td>Timeout for fetching each file.</td><td>60000</td></tr>
+<tr><td>maxFetchRetry</td><td>Maximum number of retries for fetching each file.</td><td>3</td></tr>
+</tbody>
+</table>
+<h3><a class="anchor" aria-hidden="true" id="localfirehose"></a><a href="#localfirehose" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>LocalFirehose</h3>
+<p>This Firehose can be used to read the data from files on local disk, and is mainly intended for proof-of-concept testing, and works with <code>string</code> typed parsers.
+This Firehose is <em>splittable</em> and can be used by <a href="/docs/0.20.0/ingestion/native-batch.html#parallel-task">native parallel index tasks</a>.
+Since each split represents a file in this Firehose, each worker task of <code>index_parallel</code> will read a file.
+A sample local Firehose spec is shown below:</p>
+<pre><code class="hljs css language-json">{
+    <span class="hljs-attr">"type"</span>: <span class="hljs-string">"local"</span>,
+    <span class="hljs-attr">"filter"</span> : <span class="hljs-string">"*.csv"</span>,
+    <span class="hljs-attr">"baseDir"</span>: <span class="hljs-string">"/data/directory"</span>
+}
+</code></pre>
+<table>
+<thead>
+<tr><th>property</th><th>description</th><th>required?</th></tr>
+</thead>
+<tbody>
+<tr><td>type</td><td>This should be &quot;local&quot;.</td><td>yes</td></tr>
+<tr><td>filter</td><td>A wildcard filter for files. See <a href="http://commons.apache.org/proper/commons-io/apidocs/org/apache/commons/io/filefilter/WildcardFileFilter.html">here</a> for more information.</td><td>yes</td></tr>
+<tr><td>baseDir</td><td>directory to search recursively for files to be ingested.</td><td>yes</td></tr>
+</tbody>
+</table>
+<p><a name="http-firehose"></a></p>
+<h3><a class="anchor" aria-hidden="true" id="httpfirehose"></a><a href="#httpfirehose" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>HttpFirehose</h3>
+<p>This Firehose can be used to read the data from remote sites via HTTP, and works with <code>string</code> typed parsers.
+This Firehose is <em>splittable</em> and can be used by <a href="/docs/0.20.0/ingestion/native-batch.html#parallel-task">native parallel index tasks</a>.
+Since each split represents a file in this Firehose, each worker task of <code>index_parallel</code> will read a file.
+A sample HTTP Firehose spec is shown below:</p>
+<pre><code class="hljs css language-json">{
+    <span class="hljs-attr">"type"</span>: <span class="hljs-string">"http"</span>,
+    <span class="hljs-attr">"uris"</span>: [<span class="hljs-string">"http://example.com/uri1"</span>, <span class="hljs-string">"http://example2.com/uri2"</span>]
+}
+</code></pre>
+<p>The below configurations can be optionally used if the URIs specified in the spec require a Basic Authentication Header.
+Omitting these fields from your spec will result in HTTP requests with no Basic Authentication Header.</p>
+<table>
+<thead>
+<tr><th>property</th><th>description</th><th>default</th></tr>
+</thead>
+<tbody>
+<tr><td>httpAuthenticationUsername</td><td>Username to use for authentication with specified URIs</td><td>None</td></tr>
+<tr><td>httpAuthenticationPassword</td><td>PasswordProvider to use with specified URIs</td><td>None</td></tr>
+</tbody>
+</table>
+<p>Example with authentication fields using the DefaultPassword provider (this requires the password to be in the ingestion spec):</p>
+<pre><code class="hljs css language-json">{
+    <span class="hljs-attr">"type"</span>: <span class="hljs-string">"http"</span>,
+    <span class="hljs-attr">"uris"</span>: [<span class="hljs-string">"http://example.com/uri1"</span>, <span class="hljs-string">"http://example2.com/uri2"</span>],
+    <span class="hljs-attr">"httpAuthenticationUsername"</span>: <span class="hljs-string">"username"</span>,
+    <span class="hljs-attr">"httpAuthenticationPassword"</span>: <span class="hljs-string">"password123"</span>
+}
+</code></pre>
+<p>You can also use the other existing Druid PasswordProviders. Here is an example using the EnvironmentVariablePasswordProvider:</p>
+<pre><code class="hljs css language-json">{
+    <span class="hljs-attr">"type"</span>: <span class="hljs-string">"http"</span>,
+    <span class="hljs-attr">"uris"</span>: [<span class="hljs-string">"http://example.com/uri1"</span>, <span class="hljs-string">"http://example2.com/uri2"</span>],
+    <span class="hljs-attr">"httpAuthenticationUsername"</span>: <span class="hljs-string">"username"</span>,
+    <span class="hljs-attr">"httpAuthenticationPassword"</span>: {
+        <span class="hljs-attr">"type"</span>: <span class="hljs-string">"environment"</span>,
+        <span class="hljs-attr">"variable"</span>: <span class="hljs-string">"HTTP_FIREHOSE_PW"</span>
+    }
+}
+</code></pre>
+<p>The below configurations can optionally be used for tuning the Firehose performance.
+Note that prefetching or caching isn't that useful in the Parallel task.</p>
+<table>
+<thead>
+<tr><th>property</th><th>description</th><th>default</th></tr>
+</thead>
+<tbody>
+<tr><td>maxCacheCapacityBytes</td><td>Maximum size of the cache space in bytes. 0 means disabling cache. Cached files are not removed until the ingestion task completes.</td><td>1073741824</td></tr>
+<tr><td>maxFetchCapacityBytes</td><td>Maximum size of the fetch space in bytes. 0 means disabling prefetch. Prefetched files are removed immediately once they are read.</td><td>1073741824</td></tr>
+<tr><td>prefetchTriggerBytes</td><td>Threshold to trigger prefetching HTTP objects.</td><td>maxFetchCapacityBytes / 2</td></tr>
+<tr><td>fetchTimeout</td><td>Timeout for fetching an HTTP object.</td><td>60000</td></tr>
+<tr><td>maxFetchRetry</td><td>Maximum retries for fetching an HTTP object.</td><td>3</td></tr>
+</tbody>
+</table>
+<p><a name="segment-firehose"></a></p>
+<h3><a class="anchor" aria-hidden="true" id="ingestsegmentfirehose"></a><a href="#ingestsegmentfirehose" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>IngestSegmentFirehose</h3>
+<p>This Firehose can be used to read the data from existing druid segments, potentially using a new schema and changing the name, dimensions, metrics, rollup, etc. of the segment.
+This Firehose is <em>splittable</em> and can be used by <a href="/docs/0.20.0/ingestion/native-batch.html#parallel-task">native parallel index tasks</a>.
+This firehose will accept any type of parser, but will only utilize the list of dimensions and the timestamp specification.
+A sample ingest Firehose spec is shown below:</p>
+<pre><code class="hljs css language-json">{
+    <span class="hljs-attr">"type"</span>: <span class="hljs-string">"ingestSegment"</span>,
+    <span class="hljs-attr">"dataSource"</span>: <span class="hljs-string">"wikipedia"</span>,
+    <span class="hljs-attr">"interval"</span>: <span class="hljs-string">"2013-01-01/2013-01-02"</span>
+}
+</code></pre>
+<table>
+<thead>
+<tr><th>property</th><th>description</th><th>required?</th></tr>
+</thead>
+<tbody>
+<tr><td>type</td><td>This should be &quot;ingestSegment&quot;.</td><td>yes</td></tr>
+<tr><td>dataSource</td><td>A String defining the data source to fetch rows from, very similar to a table in a relational database</td><td>yes</td></tr>
+<tr><td>interval</td><td>A String representing the ISO-8601 interval. This defines the time range to fetch the data over.</td><td>yes</td></tr>
+<tr><td>dimensions</td><td>The list of dimensions to select. If left empty, no dimensions are returned. If left null or not defined, all dimensions are returned.</td><td>no</td></tr>
+<tr><td>metrics</td><td>The list of metrics to select. If left empty, no metrics are returned. If left null or not defined, all metrics are selected.</td><td>no</td></tr>
+<tr><td>filter</td><td>See <a href="/docs/0.20.0/querying/filters.html">Filters</a></td><td>no</td></tr>
+<tr><td>maxInputSegmentBytesPerTask</td><td>Deprecated. Use <a href="#segments-split-hint-spec">Segments Split Hint Spec</a> instead. When used with the native parallel index task, the maximum number of bytes of input segments to process in a single task. If a single segment is larger than this number, it will be processed by itself in a single task (input segments are never split across tasks). Defaults to 150MB.</td><td>no</td></tr>
+</tbody>
+</table>
+<p><a name="sql-firehose"></a></p>
+<h3><a class="anchor" aria-hidden="true" id="sqlfirehose"></a><a href="#sqlfirehose" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>SqlFirehose</h3>
+<p>This Firehose can be used to ingest events residing in an RDBMS. The database connection information is provided as part of the ingestion spec.
+For each query, the results are fetched locally and indexed.
+If there are multiple queries from which data needs to be indexed, queries are prefetched in the background, up to <code>maxFetchCapacityBytes</code> bytes.
+This Firehose is <em>splittable</em> and can be used by <a href="/docs/0.20.0/ingestion/native-batch.html#parallel-task">native parallel index tasks</a>.
+This firehose will accept any type of parser, but will only utilize the list of dimensions and the timestamp specification. See the extension documentation for more detailed ingestion examples.</p>
+<p>Requires one of the following extensions:</p>
+<ul>
+<li><a href="/docs/0.20.0/development/extensions-core/mysql.html">MySQL Metadata Store</a>.</li>
+<li><a href="/docs/0.20.0/development/extensions-core/postgresql.html">PostgreSQL Metadata Store</a>.</li>
+</ul>
+<pre><code class="hljs css language-json">{
+    <span class="hljs-attr">"type"</span>: <span class="hljs-string">"sql"</span>,
+    <span class="hljs-attr">"database"</span>: {
+        <span class="hljs-attr">"type"</span>: <span class="hljs-string">"mysql"</span>,
+        <span class="hljs-attr">"connectorConfig"</span>: {
+            <span class="hljs-attr">"connectURI"</span>: <span class="hljs-string">"jdbc:mysql://host:port/schema"</span>,
+            <span class="hljs-attr">"user"</span>: <span class="hljs-string">"user"</span>,
+            <span class="hljs-attr">"password"</span>: <span class="hljs-string">"password"</span>
+        }
+     },
+    <span class="hljs-attr">"sqls"</span>: [<span class="hljs-string">"SELECT * FROM table1"</span>, <span class="hljs-string">"SELECT * FROM table2"</span>]
+}
+</code></pre>
+<table>
+<thead>
+<tr><th>property</th><th>description</th><th>default</th><th>required?</th></tr>
+</thead>
+<tbody>
+<tr><td>type</td><td>This should be &quot;sql&quot;.</td><td></td><td>Yes</td></tr>
+<tr><td>database</td><td>Specifies the database connection details.</td><td></td><td>Yes</td></tr>
+<tr><td>maxCacheCapacityBytes</td><td>Maximum size of the cache space in bytes. 0 means disabling cache. Cached files are not removed until the ingestion task completes.</td><td>1073741824</td><td>No</td></tr>
+<tr><td>maxFetchCapacityBytes</td><td>Maximum size of the fetch space in bytes. 0 means disabling prefetch. Prefetched files are removed immediately once they are read.</td><td>1073741824</td><td>No</td></tr>
+<tr><td>prefetchTriggerBytes</td><td>Threshold to trigger prefetching SQL result objects.</td><td>maxFetchCapacityBytes / 2</td><td>No</td></tr>
+<tr><td>fetchTimeout</td><td>Timeout for fetching the result set.</td><td>60000</td><td>No</td></tr>
+<tr><td>foldCase</td><td>Toggle case folding of database column names. This may be enabled in cases where the database returns case insensitive column names in query results.</td><td>false</td><td>No</td></tr>
+<tr><td>sqls</td><td>List of SQL queries where each SQL query would retrieve the data to be indexed.</td><td></td><td>Yes</td></tr>
+</tbody>
+</table>
+<h4><a class="anchor" aria-hidden="true" id="database"></a><a href="#database" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Database</h4>
+<table>
+<thead>
+<tr><th>property</th><th>description</th><th>default</th><th>required?</th></tr>
+</thead>
+<tbody>
+<tr><td>type</td><td>The type of database to query. Valid values are <code>mysql</code> and <code>postgresql</code>_</td><td></td><td>Yes</td></tr>
+<tr><td>connectorConfig</td><td>Specify the database connection properties via <code>connectURI</code>, <code>user</code> and <code>password</code></td><td></td><td>Yes</td></tr>
+</tbody>
+</table>
+<h3><a class="anchor" aria-hidden="true" id="inlinefirehose"></a><a href="#inlinefirehose" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>InlineFirehose</h3>
+<p>This Firehose can be used to read the data inlined in its own spec.
+It can be used for demos or for quickly testing out parsing and schema, and works with <code>string</code> typed parsers.
+A sample inline Firehose spec is shown below:</p>
+<pre><code class="hljs css language-json">{
+    <span class="hljs-attr">"type"</span>: <span class="hljs-string">"inline"</span>,
+    <span class="hljs-attr">"data"</span>: <span class="hljs-string">"0,values,formatted\n1,as,CSV"</span>
+}
+</code></pre>
+<table>
+<thead>
+<tr><th>property</th><th>description</th><th>required?</th></tr>
+</thead>
+<tbody>
+<tr><td>type</td><td>This should be &quot;inline&quot;.</td><td>yes</td></tr>
+<tr><td>data</td><td>Inlined data to ingest.</td><td>yes</td></tr>
+</tbody>
+</table>
+<h3><a class="anchor" aria-hidden="true" id="combiningfirehose"></a><a href="#combiningfirehose" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>CombiningFirehose</h3>
+<p>This Firehose can be used to combine and merge data from a list of different Firehoses.</p>
+<pre><code class="hljs css language-json">{
+    "type": "combining",
+    "delegates": [ { firehose1 }, { firehose2 }, ... ]
+}
+</code></pre>
+<table>
+<thead>
+<tr><th>property</th><th>description</th><th>required?</th></tr>
+</thead>
+<tbody>
+<tr><td>type</td><td>This should be &quot;combining&quot;</td><td>yes</td></tr>
+<tr><td>delegates</td><td>List of Firehoses to combine data from</td><td>yes</td></tr>
+</tbody>
+</table>
+</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/0.20.0/ingestion/standalone-realtime.html"><span class="arrow-prev">← </span><span>Realtime Process</span></a><a class="docs-next button" href="/docs/0.20.0/ingestion/hadoop.html"><span>Hadoop-based</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#tutorial">Tutorial</a></li><li><a href="#parallel-task">Parallel task</a><ul class="toc-headings"><li><a href="#compression-formats-supported">Compression formats supported</a></li><li><a href="#task-syntax">Task syntax</a></li><li><a href="#dataschema"><code>dataSchema</code></a></li><li><a href="#ioconfig"><code>ioConfig</code></a></li><li><a href="#tuningconfig"><code>tuningConfig</code></a></li><li><a href="#split-hint-spec">Split Hint Spec</a></li><li><a href="#partitionsspec"><code>partitionsSpec</code></a></li><li><a href="#http-status-endpoints">HTTP status endpoints</a></li><li><a href="#capacity-planning">Capacity planning</a></li></ul></li><li><a href="#simple-task">Simple task</a><ul class="toc-headings"><li><a href="#task-syntax-1">Task syntax</a></li><li><a href="#dataschema-1"><code>dataSchema</code></a></li><li><a href="#ioconfig-1"><code>ioConfig</code></a></li><li><a href="#tuningconfig-1"><code>tuningConfig</code></a></li><li><a href="#partitionsspec-1"><code>partitionsSpec</code></a></li><li><a href="#segmentwriteoutmediumfactory"><code>segmentWriteOutMediumFactory</code></a></li><li><a href="#segment-pushing-modes">Segment pushing modes</a></li></ul></li><li><a href="#input-sources">Input Sources</a><ul class="toc-headings"><li><a href="#s3-input-source">S3 Input Source</a></li><li><a href="#google-cloud-storage-input-source">Google Cloud Storage Input Source</a></li><li><a href="#azure-input-source">Azure Input Source</a></li><li><a href="#hdfs-input-source">HDFS Input Source</a></li><li><a href="#http-input-source">HTTP Input Source</a></li><li><a href="#inline-input-source">Inline Input Source</a></li><li><a href="#local-input-source">Local Input Source</a></li><li><a href="#druid-input-source">Druid Input Source</a></li><li><a href="#sql-input-source">SQL Input Source</a></li><li><a href="#combining-input-source">Combining Input Source</a></li></ul></li><li><a href="#firehoses-deprecated">Firehoses (Deprecated)</a><ul class="toc-headings"><li><a href="#statics3firehose">StaticS3Firehose</a></li><li><a href="#hdfsfirehose">HDFSFirehose</a></li><li><a href="#localfirehose">LocalFirehose</a></li><li><a href="#httpfirehose">HttpFirehose</a></li><li><a href="#ingestsegmentfirehose">IngestSegmentFirehose</a></li><li><a href="#sqlfirehose">SqlFirehose</a></li><li><a href="#inlinefirehose">InlineFirehose</a></li><li><a href="#combiningfirehose">CombiningFirehose</a></li></ul></li></ul></nav></div><footer class="nav-footer druid-footer" id="footer"><div class="container"><div class="text-center"><p><a href="/technology">Technology</a> · <a href="/use-cases">Use Cases</a> · <a href="/druid-powered">Powered by Druid</a> · <a href="/docs/0.20.0/latest">Docs</a> · <a href="/community/">Community</a> · <a href="/downloads.html">Download</a> · <a href="/faq">FAQ</a></p></div><div class="text-center"><a title="Join the user group" href="https://groups.google.com/forum/#!forum/druid-user" target="_blank"><span class="fa fa-comments"></span></a> · <a title="Follow Druid" href="https://twitter.com/druidio" target="_blank"><span class="fab fa-twitter"></span></a> · <a title="Download via Apache" href="https://www.apache.org/dyn/closer.cgi?path=/incubator/druid/{{ site.druid_versions[0].versions[0].version }}/apache-druid-{{ site.druid_versions[0].versions[0].version }}-bin.tar.gz" target="_blank"><span class="fas fa-feather"></span></a> · <a title="GitHub" href="https://github.com/apache/druid" target="_blank"><span class="fab fa-github"></span></a></div><div class="text-center license">Copyright © 2019 <a href="https://www.apache.org/" target="_blank">Apache Software Foundation</a>.<br/>Except where otherwise noted, licensed under <a rel="license" href="http://creativecommons.org/licenses/by-sa/4.0/">CC BY-SA 4.0</a>.<br/>Apache Druid, Druid, and the Druid logo are either registered trademarks or trademarks of The Apache Software Foundation in the United States and other countries.</div></div></footer></div><script type="text/javascript" src="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.js"></script><script>
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+<h2><a class="anchor" aria-hidden="true" id="druids-data-model"></a><a href="#druids-data-model" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Druid's data model</h2>
+<p>For general information, check out the documentation on <a href="/docs/0.20.0/ingestion/index.html#data-model">Druid's data model</a> on the main
+ingestion overview page. The rest of this page discusses tips for users coming from other kinds of systems, as well as
+general tips and common practices.</p>
+<ul>
+<li>Druid data is stored in <a href="/docs/0.20.0/ingestion/index.html#datasources">datasources</a>, which are similar to tables in a traditional RDBMS.</li>
+<li>Druid datasources can be ingested with or without <a href="#rollup">rollup</a>. With rollup enabled, Druid partially aggregates your data during ingestion, potentially reducing its row count, decreasing storage footprint, and improving query performance. With rollup disabled, Druid stores one row for each row in your input data, without any pre-aggregation.</li>
+<li>Every row in Druid must have a timestamp. Data is always partitioned by time, and every query has a time filter. Query results can also be broken down by time buckets like minutes, hours, days, and so on.</li>
+<li>All columns in Druid datasources, other than the timestamp column, are either dimensions or metrics. This follows the <a href="https://en.wikipedia.org/wiki/Online_analytical_processing#Overview_of_OLAP_systems">standard naming convention</a> of OLAP data.</li>
+<li>Typical production datasources have tens to hundreds of columns.</li>
+<li><a href="/docs/0.20.0/ingestion/index.html#dimensions">Dimension columns</a> are stored as-is, so they can be filtered on, grouped by, or aggregated at query time. They are always single Strings, <a href="/docs/0.20.0/querying/multi-value-dimensions.html">arrays of Strings</a>, single Longs, single Doubles or single Floats.</li>
+<li><a href="/docs/0.20.0/ingestion/index.html#metrics">Metric columns</a> are stored <a href="/docs/0.20.0/querying/aggregations.html">pre-aggregated</a>, so they can only be aggregated at query time (not filtered or grouped by). They are often stored as numbers (integers or floats) but can also be stored as complex objects like <a href="/docs/0.20.0/querying/aggregations.html#approx">HyperLogLog sketches or approximate quantile sketches</a>. Metrics can be configured at ingestion time even when rollup is disabled, but are most useful when rollup is enabled.</li>
+</ul>
+<h2><a class="anchor" aria-hidden="true" id="if-youre-coming-from-a"></a><a href="#if-youre-coming-from-a" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>If you're coming from a...</h2>
+<h3><a class="anchor" aria-hidden="true" id="relational-model"></a><a href="#relational-model" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Relational model</h3>
+<p>(Like Hive or PostgreSQL.)</p>
+<p>Druid datasources are generally equivalent to tables in a relational database. Druid <a href="/docs/0.20.0/querying/lookups.html">lookups</a>
+can act similarly to data-warehouse-style dimension tables, but as you'll see below, denormalization is often
+recommended if you can get away with it.</p>
+<p>Common practice for relational data modeling involves <a href="https://en.wikipedia.org/wiki/Database_normalization">normalization</a>:
+the idea of splitting up data into multiple tables such that data redundancy is reduced or eliminated. For example, in a
+&quot;sales&quot; table, best-practices relational modeling calls for a &quot;product id&quot; column that is a foreign key into a separate
+&quot;products&quot; table, which in turn has &quot;product id&quot;, &quot;product name&quot;, and &quot;product category&quot; columns. This prevents the
+product name and category from needing to be repeated on different rows in the &quot;sales&quot; table that refer to the same
+product.</p>
+<p>In Druid, on the other hand, it is common to use totally flat datasources that do not require joins at query time. In
+the example of the &quot;sales&quot; table, in Druid it would be typical to store &quot;product_id&quot;, &quot;product_name&quot;, and
+&quot;product_category&quot; as dimensions directly in a Druid &quot;sales&quot; datasource, without using a separate &quot;products&quot; table.
+Totally flat schemas substantially increase performance, since the need for joins is eliminated at query time. As an
+an added speed boost, this also allows Druid's query layer to operate directly on compressed dictionary-encoded data.
+Perhaps counter-intuitively, this does <em>not</em> substantially increase storage footprint relative to normalized schemas,
+since Druid uses dictionary encoding to effectively store just a single integer per row for string columns.</p>
+<p>If necessary, Druid datasources can be partially normalized through the use of <a href="/docs/0.20.0/querying/lookups.html">lookups</a>,
+which are the rough equivalent of dimension tables in a relational database. At query time, you would use Druid's SQL
+<code>LOOKUP</code> function, or native lookup extraction functions, instead of using the JOIN keyword like you would in a
+relational database. Since lookup tables impose an increase in memory footprint and incur more computational overhead
+at query time, it is only recommended to do this if you need the ability to update a lookup table and have the changes
+reflected immediately for already-ingested rows in your main table.</p>
+<p>Tips for modeling relational data in Druid:</p>
+<ul>
+<li>Druid datasources do not have primary or unique keys, so skip those.</li>
+<li>Denormalize if possible. If you need to be able to update dimension / lookup tables periodically and have those
+changes reflected in already-ingested data, consider partial normalization with <a href="/docs/0.20.0/querying/lookups.html">lookups</a>.</li>
+<li>If you need to join two large distributed tables with each other, you must do this before loading the data into Druid.
+Druid does not support query-time joins of two datasources. Lookups do not help here, since a full copy of each lookup
+table is stored on each Druid server, so they are not a good choice for large tables.</li>
+<li>Consider whether you want to enable <a href="#rollup">rollup</a> for pre-aggregation, or whether you want to disable
+rollup and load your existing data as-is. Rollup in Druid is similar to creating a summary table in a relational model.</li>
+</ul>
+<h3><a class="anchor" aria-hidden="true" id="time-series-model"></a><a href="#time-series-model" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Time series model</h3>
+<p>(Like OpenTSDB or InfluxDB.)</p>
+<p>Similar to time series databases, Druid's data model requires a timestamp. Druid is not a timeseries database, but
+it is a natural choice for storing timeseries data. Its flexible data model allows it to store both timeseries and
+non-timeseries data, even in the same datasource.</p>
+<p>To achieve best-case compression and query performance in Druid for timeseries data, it is important to partition and
+sort by metric name, like timeseries databases often do. See <a href="index.html#partitioning">Partitioning and sorting</a> for more details.</p>
+<p>Tips for modeling timeseries data in Druid:</p>
+<ul>
+<li>Druid does not think of data points as being part of a &quot;time series&quot;. Instead, Druid treats each point separately
+for ingestion and aggregation.</li>
+<li>Create a dimension that indicates the name of the series that a data point belongs to. This dimension is often called
+&quot;metric&quot; or &quot;name&quot;. Do not get the dimension named &quot;metric&quot; confused with the concept of Druid metrics. Place this
+first in the list of dimensions in your &quot;dimensionsSpec&quot; for best performance (this helps because it improves locality;
+see <a href="index.html#partitioning">partitioning and sorting</a> below for details).</li>
+<li>Create other dimensions for attributes attached to your data points. These are often called &quot;tags&quot; in timeseries
+database systems.</li>
+<li>Create <a href="/docs/0.20.0/querying/aggregations.html">metrics</a> corresponding to the types of aggregations that you want to be able
+to query. Typically this includes &quot;sum&quot;, &quot;min&quot;, and &quot;max&quot; (in one of the long, float, or double flavors). If you want to
+be able to compute percentiles or quantiles, use Druid's <a href="../querying/aggregations.html#approx">approximate aggregators</a>.</li>
+<li>Consider enabling <a href="#rollup">rollup</a>, which will allow Druid to potentially combine multiple points into one
+row in your Druid datasource. This can be useful if you want to store data at a different time granularity than it is
+naturally emitted. It is also useful if you want to combine timeseries and non-timeseries data in the same datasource.</li>
+<li>If you don't know ahead of time what columns you'll want to ingest, use an empty dimensions list to trigger
+<a href="#schema-less-dimensions">automatic detection of dimension columns</a>.</li>
+</ul>
+<h3><a class="anchor" aria-hidden="true" id="log-aggregation-model"></a><a href="#log-aggregation-model" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Log aggregation model</h3>
+<p>(Like Elasticsearch or Splunk.)</p>
+<p>Similar to log aggregation systems, Druid offers inverted indexes for fast searching and filtering. Druid's search
+capabilities are generally less developed than these systems, and its analytical capabilities are generally more
+developed. The main data modeling differences between Druid and these systems are that when ingesting data into Druid,
+you must be more explicit. Druid columns have types specific upfront and Druid does not, at this time, natively support
+nested data.</p>
+<p>Tips for modeling log data in Druid:</p>
+<ul>
+<li>If you don't know ahead of time what columns you'll want to ingest, use an empty dimensions list to trigger
+<a href="#schema-less-dimensions">automatic detection of dimension columns</a>.</li>
+<li>If you have nested data, flatten it using a <a href="/docs/0.20.0/ingestion/index.html#flattenspec"><code>flattenSpec</code></a>.</li>
+<li>Consider enabling <a href="#rollup">rollup</a> if you have mainly analytical use cases for your log data. This will
+mean you lose the ability to retrieve individual events from Druid, but you potentially gain substantial compression and
+query performance boosts.</li>
+</ul>
+<h2><a class="anchor" aria-hidden="true" id="general-tips-and-best-practices"></a><a href="#general-tips-and-best-practices" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>General tips and best practices</h2>
+<h3><a class="anchor" aria-hidden="true" id="rollup"></a><a href="#rollup" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Rollup</h3>
+<p>Druid can roll up data as it is ingested to minimize the amount of raw data that needs to be stored. This is a form
+of summarization or pre-aggregation. For more details, see the <a href="/docs/0.20.0/ingestion/index.html#rollup">Rollup</a> section of the ingestion
+documentation.</p>
+<h3><a class="anchor" aria-hidden="true" id="partitioning-and-sorting"></a><a href="#partitioning-and-sorting" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Partitioning and sorting</h3>
+<p>Optimally partitioning and sorting your data can have substantial impact on footprint and performance. For more details,
+see the <a href="/docs/0.20.0/ingestion/index.html#partitioning">Partitioning</a> section of the ingestion documentation.</p>
+<p><a name="sketches"></a></p>
+<h3><a class="anchor" aria-hidden="true" id="sketches-for-high-cardinality-columns"></a><a href="#sketches-for-high-cardinality-columns" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Sketches for high cardinality columns</h3>
+<p>When dealing with high cardinality columns like user IDs or other unique IDs, consider using sketches for approximate
+analysis rather than operating on the actual values. When you ingest data using a sketch, Druid does not store the
+original raw data, but instead stores a &quot;sketch&quot; of it that it can feed into a later computation at query time. Popular
+use cases for sketches include count-distinct and quantile computation. Each sketch is designed for just one particular
+kind of computation.</p>
+<p>In general using sketches serves two main purposes: improving rollup, and reducing memory footprint at
+query time.</p>
+<p>Sketches improve rollup ratios because they allow you to collapse multiple distinct values into the same sketch. For
+example, if you have two rows that are identical except for a user ID (perhaps two users did the same action at the
+same time), storing them in a count-distinct sketch instead of as-is means you can store the data in one row instead of
+two. You won't be able to retrieve the user IDs or compute exact distinct counts, but you'll still be able to compute
+approximate distinct counts, and you'll reduce your storage footprint.</p>
+<p>Sketches reduce memory footprint at query time because they limit the amount of data that needs to be shuffled between
+servers. For example, in a quantile computation, instead of needing to send all data points to a central location
+so they can be sorted and the quantile can be computed, Druid instead only needs to send a sketch of the points. This
+can reduce data transfer needs to mere kilobytes.</p>
+<p>For details about the sketches available in Druid, see the
+<a href="../querying/aggregations.html#approx">approximate aggregators</a> page.</p>
+<p>If you prefer videos, take a look at <a href="https://www.youtube.com/watch?v=Hpd3f_MLdXo">Not exactly!</a>, a conference talk
+about sketches in Druid.</p>
+<h3><a class="anchor" aria-hidden="true" id="string-vs-numeric-dimensions"></a><a href="#string-vs-numeric-dimensions" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>String vs numeric dimensions</h3>
+<p>If the user wishes to ingest a column as a numeric-typed dimension (Long, Double or Float), it is necessary to specify the type of the column in the <code>dimensions</code> section of the <code>dimensionsSpec</code>. If the type is omitted, Druid will ingest a column as the default String type.</p>
+<p>There are performance tradeoffs between string and numeric columns. Numeric columns are generally faster to group on
+than string columns. But unlike string columns, numeric columns don't have indexes, so they can be slower to filter on.
+You may want to experiment to find the optimal choice for your use case.</p>
+<p>For details about how to configure numeric dimensions, see the <a href="/docs/0.20.0/ingestion/index.html#dimensionsspec"><code>dimensionsSpec</code></a> documentation.</p>
+<h3><a class="anchor" aria-hidden="true" id="secondary-timestamps"></a><a href="#secondary-timestamps" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Secondary timestamps</h3>
+<p>Druid schemas must always include a primary timestamp. The primary timestamp is used for
+<a href="index.html#partitioning">partitioning and sorting</a> your data, so it should be the timestamp that you will most often filter on.
+Druid is able to rapidly identify and retrieve data corresponding to time ranges of the primary timestamp column.</p>
+<p>If your data has more than one timestamp, you can ingest the others as secondary timestamps. The best way to do this
+is to ingest them as <a href="/docs/0.20.0/ingestion/index.html#dimensionsspec">long-typed dimensions</a> in milliseconds format.
+If necessary, you can get them into this format using a <a href="/docs/0.20.0/ingestion/index.html#transformspec"><code>transformSpec</code></a> and
+<a href="/docs/0.20.0/misc/math-expr.html">expressions</a> like <code>timestamp_parse</code>, which returns millisecond timestamps.</p>
+<p>At query time, you can query secondary timestamps with <a href="../querying/sql.html#time-functions">SQL time functions</a>
+like <code>MILLIS_TO_TIMESTAMP</code>, <code>TIME_FLOOR</code>, and others. If you're using native Druid queries, you can use
+<a href="/docs/0.20.0/misc/math-expr.html">expressions</a>.</p>
+<h3><a class="anchor" aria-hidden="true" id="nested-dimensions"></a><a href="#nested-dimensions" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Nested dimensions</h3>
+<p>At the time of this writing, Druid does not support nested dimensions. Nested dimensions need to be flattened. For example,
+if you have data of the following form:</p>
+<pre><code class="hljs">{<span class="hljs-attr">"foo"</span>:{<span class="hljs-attr">"bar"</span>: <span class="hljs-number">3</span>}}
+</code></pre>
+<p>then before indexing it, you should transform it to:</p>
+<pre><code class="hljs">{<span class="hljs-attr">"foo_bar"</span>: <span class="hljs-number">3</span>}
+</code></pre>
+<p>Druid is capable of flattening JSON, Avro, or Parquet input data.
+Please read about <a href="/docs/0.20.0/ingestion/index.html#flattenspec"><code>flattenSpec</code></a> for more details.</p>
+<p><a name="counting"></a></p>
+<h3><a class="anchor" aria-hidden="true" id="counting-the-number-of-ingested-events"></a><a href="#counting-the-number-of-ingested-events" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Counting the number of ingested events</h3>
+<p>When rollup is enabled, count aggregators at query time do not actually tell you the number of rows that have been
+ingested. They tell you the number of rows in the Druid datasource, which may be smaller than the number of rows
+ingested.</p>
+<p>In this case, a count aggregator at <em>ingestion</em> time can be used to count the number of events. However, it is important to note
+that when you query for this metric, you should use a <code>longSum</code> aggregator. A <code>count</code> aggregator at query time will return
+the number of Druid rows for the time interval, which can be used to determine what the roll-up ratio was.</p>
+<p>To clarify with an example, if your ingestion spec contains:</p>
+<pre><code class="hljs">...
+<span class="hljs-string">"metricsSpec"</span> : [
+      {
+        <span class="hljs-string">"type"</span> : <span class="hljs-string">"count"</span>,
+        <span class="hljs-string">"name"</span> : <span class="hljs-string">"count"</span>
+      },
+...
+</code></pre>
+<p>You should query for the number of ingested rows with:</p>
+<pre><code class="hljs">...
+<span class="hljs-string">"aggregations"</span>: [
+    { <span class="hljs-string">"type"</span>: <span class="hljs-string">"longSum"</span>, <span class="hljs-string">"name"</span>: <span class="hljs-string">"numIngestedEvents"</span>, <span class="hljs-string">"fieldName"</span>: <span class="hljs-string">"count"</span> },
+...
+</code></pre>
+<h3><a class="anchor" aria-hidden="true" id="schema-less-dimensions"></a><a href="#schema-less-dimensions" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Schema-less dimensions</h3>
+<p>If the <code>dimensions</code> field is left empty in your ingestion spec, Druid will treat every column that is not the timestamp column,
+a dimension that has been excluded, or a metric column as a dimension.</p>
+<p>Note that when using schema-less ingestion, all dimensions will be ingested as String-typed dimensions.</p>
+<h3><a class="anchor" aria-hidden="true" id="including-the-same-column-as-a-dimension-and-a-metric"></a><a href="#including-the-same-column-as-a-dimension-and-a-metric" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Including the same column as a dimension and a metric</h3>
+<p>One workflow with unique IDs is to be able to filter on a particular ID, while still being able to do fast unique counts on the ID column.
+If you are not using schema-less dimensions, this use case is supported by setting the <code>name</code> of the metric to something different than the dimension.
+If you are using schema-less dimensions, the best practice here is to include the same column twice, once as a dimension, and as a <code>hyperUnique</code> metric. This may involve
+some work at ETL time.</p>
+<p>As an example, for schema-less dimensions, repeat the same column:</p>
+<pre><code class="hljs">{<span class="hljs-attr">"device_id_dim"</span>:<span class="hljs-number">123</span>, <span class="hljs-attr">"device_id_met"</span>:<span class="hljs-number">123</span>}
+</code></pre>
+<p>and in your <code>metricsSpec</code>, include:</p>
+<pre><code class="hljs">{ <span class="hljs-attr">"type"</span> : <span class="hljs-string">"hyperUnique"</span>, <span class="hljs-attr">"name"</span> : <span class="hljs-string">"devices"</span>, <span class="hljs-attr">"fieldName"</span> : <span class="hljs-string">"device_id_met"</span> }
+</code></pre>
+<p><code>device_id_dim</code> should automatically get picked up as a dimension.</p>
+</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/0.20.0/ingestion/data-formats.html"><span class="arrow-prev">← </span><span>Data formats</span></a><a class="docs-next button" href="/docs/0.20.0/ingestion/data-management.html"><span>Data management</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#druids-data-model">Druid's data model</a></li><li><a href="#if-youre-coming-from-a">If you're coming from a...</a><ul class="toc-headings"><li><a href="#relational-model">Relational model</a></li><li><a href="#time-series-model">Time series model</a></li><li><a href="#log-aggregation-model">Log aggregation model</a></li></ul></li><li><a href="#general-tips-and-best-practices">General tips and best practices</a><ul class="toc-headings"><li><a href="#rollup">Rollup</a></li><li><a href="#partitioning-and-sorting">Partitioning and sorting</a></li><li><a href="#sketches-for-high-cardinality-columns">Sketches for high cardinality columns</a></li><li><a href="#string-vs-numeric-dimensions">String vs numeric dimensions</a></li><li><a href="#secondary-timestamps">Secondary timestamps</a></li><li><a href="#nested-dimensions">Nested dimensions</a></li><li><a href="#counting-the-number-of-ingested-events">Counting the number of ingested events</a></li><li><a href="#schema-less-dimensions">Schema-less dimensions</a></li><li><a href="#including-the-same-column-as-a-dimension-and-a-metric">Including the same column as a dimension and a metric</a></li></ul></li></ul></nav></div><footer class="nav-footer druid-footer" id="footer"><div class="container"><div class="text-center"><p><a href="/technology">Technology</a> · <a href="/use-cases">Use Cases</a> · <a href="/druid-powered">Powered by Druid</a> · <a href="/docs/0.20.0/latest">Docs</a> · <a href="/community/">Community</a> · <a href="/downloads.html">Download</a> · <a href="/faq">FAQ</a></p></div><div class="text-center"><a title="Join the user group" href="https://groups.google.com/forum/#!forum/druid-user" target="_blank"><span class="fa fa-comments"></span></a> · <a title="Follow Druid" href="https://twitter.com/druidio" target="_blank"><span class="fab fa-twitter"></span></a> · <a title="Download via Apache" href="https://www.apache.org/dyn/closer.cgi?path=/incubator/druid/{{ site.druid_versions[0].versions[0].version }}/apache-druid-{{ site.druid_versions[0].versions[0].version }}-bin.tar.gz" target="_blank"><span class="fas fa-feather"></span></a> · <a title="GitHub" href="https://github.com/apache/druid" target="_blank"><span class="fab fa-github"></span></a></div><div class="text-center license">Copyright © 2019 <a href="https://www.apache.org/" target="_blank">Apache Software Foundation</a>.<br/>Except where otherwise noted, licensed under <a rel="license" href="http://creativecommons.org/licenses/by-sa/4.0/">CC BY-SA 4.0</a>.<br/>Apache Druid, Druid, and the Druid logo are either registered trademarks or trademarks of The Apache Software Foundation in the United States and other countries.</div></div></footer></div><script type="text/javascript" src="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.js"></script><script>
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+<p>Older versions of Apache Druid supported a standalone 'Realtime' process to query and index 'stream pull'
+modes of real-time ingestion. These processes would periodically build segments for the data they had collected over
+some span of time and then set up hand-off to <a href="../design/historical.html">Historical</a> servers.</p>
+<p>This processes could be invoked by</p>
+<pre><code class="hljs">org.apache.druid.cli.Main<span class="hljs-built_in"> server </span>realtime
+</code></pre>
+<p>This model of stream pull ingestion was deprecated for a number of both operational and architectural reasons, and
+removed completely in Druid 0.16.0. Operationally, realtime nodes were difficult to configure, deploy, and scale because
+each node required an unique configuration. The design of the stream pull ingestion system for realtime nodes also
+suffered from limitations which made it not possible to achieve exactly once ingestion.</p>
+<p>The extensions <code>druid-kafka-eight</code>, <code>druid-kafka-eight-simpleConsumer</code>, <code>druid-rabbitmq</code>, and <code>druid-rocketmq</code> were also
+removed at this time, since they were built to operate on the realtime nodes.</p>
+<p>Please consider using the <a href="../development/extensions-core/kafka-ingestion.html">Kafka Indexing Service</a> or
+<a href="/docs/0.20.0/development/extensions-core/kinesis-ingestion.html">Kinesis Indexing Service</a> for stream pull ingestion instead.</p>
+</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/0.20.0/querying/select-query.html"><span class="arrow-prev">← </span><span>Select</span></a></div></div></div><nav class="onPageNav"></nav></div><footer class="nav-footer druid-footer" id="footer"><div class="container"><div class="text-center"><p><a href="/technology">Technology</a> · <a href="/use-cases">Use Cases</a> · <a href="/druid-powered">Powered by Druid</a> · <a href="/docs/0.20.0/latest">Docs</a> · <a href="/community/">Community</a> · <a href="/downloads.html">Download</a> · <a href="/faq">FAQ</a></p></div><div class="text-center"><a title="Join the user group" href="https://groups.google.com/forum/#!forum/druid-user" target="_blank"><span class="fa fa-comments"></span></a> · <a title="Follow Druid" href="https://twitter.com/druidio" target="_blank"><span class="fab fa-twitter"></span></a> · <a title="Download via Apache" href="https://www.apache.org/dyn/closer.cgi?path=/incubator/druid/{{ site.druid_versions[0].versions[0].version }}/apache-druid-{{ site.druid_versions[0].versions[0].version }}-bin.tar.gz" target="_blank"><span class="fas fa-feather"></span></a> · <a title="GitHub" href="https://github.com/apache/druid" target="_blank"><span class="fab fa-github"></span></a></div><div class="text-center license">Copyright © 2019 <a href="https://www.apache.org/" target="_blank">Apache Software Foundation</a>.<br/>Except where otherwise noted, licensed under <a rel="license" href="http://creativecommons.org/licenses/by-sa/4.0/">CC BY-SA 4.0</a>.<br/>Apache Druid, Druid, and the Druid logo are either registered trademarks or trademarks of The Apache Software Foundation in the United States and other countries.</div></div></footer></div><script type="text/javascript" src="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.js"></script><script>
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+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>Redirecting...</title>
+<link rel="canonical" href="index.html#streaming">
+<meta http-equiv="refresh" content="0; url=index.html#streaming">
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diff --git a/docs/0.20.0/ingestion/stream-pull.html b/docs/0.20.0/ingestion/stream-pull.html
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+<meta charset="utf-8">
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diff --git a/docs/0.20.0/ingestion/tasks.html b/docs/0.20.0/ingestion/tasks.html
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+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Task reference · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/0.20.0/ingestion/tasks.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.20.0" /><meta property="og:title" content="Task reference · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
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UIs</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/operations/deep-storage-migration.html">Deep storage migration</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/operations/export-metadata.html">Export Metadata Tool</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/operations/metadata-migration.html">Metadata Migration</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/operations/segment-optimization.html">Segment Size Optimization</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/operations/use_sbt_to_build_fat_jar.html">Content for build.sbt</a></li></ul></div></ul></div><div class="navGroup"><h3 class="navGroupCategoryTitle collapsible">Development<span class="arrow"><svg width="24" height="24" viewBox="0 0 24 24"><path fill="#565656" d="M7.41 15.41L12 10.83l4.59 4.58L18 14l-6-6-6 6z"></path><path d="M0 0h24v24H0z" fill="none"></path></svg></span></h3><ul class="hide"><li 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class="navListItem"><a class="navItem" href="/docs/0.20.0/comparisons/druid-vs-spark.html">Apache Druid vs Spark</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/comparisons/druid-vs-sql-on-hadoop.html">Apache Druid vs SQL-on-Hadoop</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/design/auth.html">Authentication and Authorization</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/design/broker.html">Broker</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/design/coordinator.html">Coordinator Process</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/design/historical.html">Historical Process</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/design/indexer.html">Indexer Process</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/design/indexing-service.html">Indexing Service</a></li><li class="navListItem"><a class="navItem" 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href="/docs/0.20.0/development/extensions-core/simple-client-sslcontext.html">Simple SSLContext Provider Module</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-core/stats.html">Stats aggregator</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-core/test-stats.html">Test Stats Aggregators</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-contrib/ambari-metrics-emitter.html">Ambari Metrics Emitter</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-contrib/cassandra.html">Apache Cassandra</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-contrib/cloudfiles.html">Rackspace Cloud Files</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-contrib/distinctcount.html">DistinctCount Aggregator</a></li><li class="navListItem"><a class="navItem" 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class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-contrib/opentsdb-emitter.html">OpenTSDB Emitter</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-contrib/redis-cache.html">Druid Redis Cache</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-contrib/sqlserver.html">Microsoft SQLServer</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-contrib/statsd.html">StatsD Emitter</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-contrib/tdigestsketch-quantiles.html">T-Digest Quantiles Sketch module</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-contrib/thrift.html">Thrift</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-contrib/time-min-max.html">Timestamp Min/Max aggregators</a></li><li 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+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
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+<p>Tasks do all <a href="/docs/0.20.0/ingestion/index.html">ingestion</a>-related work in Druid.</p>
+<p>For batch ingestion, you will generally submit tasks directly to Druid using the
+<a href="/docs/0.20.0/operations/api-reference.html#tasks">Task APIs</a>. For streaming ingestion, tasks are generally submitted for you by a
+supervisor.</p>
+<h2><a class="anchor" aria-hidden="true" id="task-api"></a><a href="#task-api" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Task API</h2>
+<p>Task APIs are available in two main places:</p>
+<ul>
+<li>The <a href="/docs/0.20.0/design/overlord.html">Overlord</a> process offers HTTP APIs to submit tasks, cancel tasks, check their status,
+review logs and reports, and more. Refer to the <a href="/docs/0.20.0/operations/api-reference.html#tasks">Tasks API reference page</a> for a
+full list.</li>
+<li>Druid SQL includes a <a href="/docs/0.20.0/querying/sql.html#tasks-table"><code>sys.tasks</code></a> table that provides information about currently
+running tasks. This table is read-only, and has a limited (but useful!) subset of the full information available through
+the Overlord APIs.</li>
+</ul>
+<p><a name="reports"></a></p>
+<h2><a class="anchor" aria-hidden="true" id="task-reports"></a><a href="#task-reports" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Task reports</h2>
+<p>A report containing information about the number of rows ingested, and any parse exceptions that occurred is available for both completed tasks and running tasks.</p>
+<p>The reporting feature is supported by the <a href="/docs/0.20.0/ingestion/native-batch.html#simple-task">simple native batch task</a>, the Hadoop batch task, and Kafka and Kinesis ingestion tasks.</p>
+<h3><a class="anchor" aria-hidden="true" id="completion-report"></a><a href="#completion-report" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Completion report</h3>
+<p>After a task completes, a completion report can be retrieved at:</p>
+<pre><code class="hljs">http:<span class="hljs-regexp">//</span>&lt;OVERLORD-HOST&gt;:&lt;OVERLORD-PORT&gt;<span class="hljs-regexp">/druid/i</span>ndexer<span class="hljs-regexp">/v1/</span>task<span class="hljs-regexp">/&lt;task-id&gt;/</span>reports
+</code></pre>
+<p>An example output is shown below:</p>
+<pre><code class="hljs css language-json">{
+  <span class="hljs-attr">"ingestionStatsAndErrors"</span>: {
+    <span class="hljs-attr">"taskId"</span>: <span class="hljs-string">"compact_twitter_2018-09-24T18:24:23.920Z"</span>,
+    <span class="hljs-attr">"payload"</span>: {
+      <span class="hljs-attr">"ingestionState"</span>: <span class="hljs-string">"COMPLETED"</span>,
+      <span class="hljs-attr">"unparseableEvents"</span>: {},
+      <span class="hljs-attr">"rowStats"</span>: {
+        <span class="hljs-attr">"determinePartitions"</span>: {
+          <span class="hljs-attr">"processed"</span>: <span class="hljs-number">0</span>,
+          <span class="hljs-attr">"processedWithError"</span>: <span class="hljs-number">0</span>,
+          <span class="hljs-attr">"thrownAway"</span>: <span class="hljs-number">0</span>,
+          <span class="hljs-attr">"unparseable"</span>: <span class="hljs-number">0</span>
+        },
+        <span class="hljs-attr">"buildSegments"</span>: {
+          <span class="hljs-attr">"processed"</span>: <span class="hljs-number">5390324</span>,
+          <span class="hljs-attr">"processedWithError"</span>: <span class="hljs-number">0</span>,
+          <span class="hljs-attr">"thrownAway"</span>: <span class="hljs-number">0</span>,
+          <span class="hljs-attr">"unparseable"</span>: <span class="hljs-number">0</span>
+        }
+      },
+      <span class="hljs-attr">"errorMsg"</span>: <span class="hljs-literal">null</span>
+    },
+    <span class="hljs-attr">"type"</span>: <span class="hljs-string">"ingestionStatsAndErrors"</span>
+  }
+}
+</code></pre>
+<h3><a class="anchor" aria-hidden="true" id="live-report"></a><a href="#live-report" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Live report</h3>
+<p>When a task is running, a live report containing ingestion state, unparseable events and moving average for number of events processed for 1 min, 5 min, 15 min time window can be retrieved at:</p>
+<pre><code class="hljs">http:<span class="hljs-regexp">//</span>&lt;OVERLORD-HOST&gt;:&lt;OVERLORD-PORT&gt;<span class="hljs-regexp">/druid/i</span>ndexer<span class="hljs-regexp">/v1/</span>task<span class="hljs-regexp">/&lt;task-id&gt;/</span>reports
+</code></pre>
+<p>and</p>
+<pre><code class="hljs">http:<span class="hljs-regexp">//</span>&lt;middlemanager-host&gt;:&lt;worker-port&gt;<span class="hljs-regexp">/druid/</span>worker<span class="hljs-regexp">/v1/</span>chat<span class="hljs-regexp">/&lt;task-id&gt;/</span>liveReports
+</code></pre>
+<p>An example output is shown below:</p>
+<pre><code class="hljs css language-json">{
+  <span class="hljs-attr">"ingestionStatsAndErrors"</span>: {
+    <span class="hljs-attr">"taskId"</span>: <span class="hljs-string">"compact_twitter_2018-09-24T18:24:23.920Z"</span>,
+    <span class="hljs-attr">"payload"</span>: {
+      <span class="hljs-attr">"ingestionState"</span>: <span class="hljs-string">"RUNNING"</span>,
+      <span class="hljs-attr">"unparseableEvents"</span>: {},
+      <span class="hljs-attr">"rowStats"</span>: {
+        <span class="hljs-attr">"movingAverages"</span>: {
+          <span class="hljs-attr">"buildSegments"</span>: {
+            <span class="hljs-attr">"5m"</span>: {
+              <span class="hljs-attr">"processed"</span>: <span class="hljs-number">3.392158326408501</span>,
+              <span class="hljs-attr">"unparseable"</span>: <span class="hljs-number">0</span>,
+              <span class="hljs-attr">"thrownAway"</span>: <span class="hljs-number">0</span>,
+              <span class="hljs-attr">"processedWithError"</span>: <span class="hljs-number">0</span>
+            },
+            <span class="hljs-attr">"15m"</span>: {
+              <span class="hljs-attr">"processed"</span>: <span class="hljs-number">1.736165476881023</span>,
+              <span class="hljs-attr">"unparseable"</span>: <span class="hljs-number">0</span>,
+              <span class="hljs-attr">"thrownAway"</span>: <span class="hljs-number">0</span>,
+              <span class="hljs-attr">"processedWithError"</span>: <span class="hljs-number">0</span>
+            },
+            <span class="hljs-attr">"1m"</span>: {
+              <span class="hljs-attr">"processed"</span>: <span class="hljs-number">4.206417693750045</span>,
+              <span class="hljs-attr">"unparseable"</span>: <span class="hljs-number">0</span>,
+              <span class="hljs-attr">"thrownAway"</span>: <span class="hljs-number">0</span>,
+              <span class="hljs-attr">"processedWithError"</span>: <span class="hljs-number">0</span>
+            }
+          }
+        },
+        <span class="hljs-attr">"totals"</span>: {
+          <span class="hljs-attr">"buildSegments"</span>: {
+            <span class="hljs-attr">"processed"</span>: <span class="hljs-number">1994</span>,
+            <span class="hljs-attr">"processedWithError"</span>: <span class="hljs-number">0</span>,
+            <span class="hljs-attr">"thrownAway"</span>: <span class="hljs-number">0</span>,
+            <span class="hljs-attr">"unparseable"</span>: <span class="hljs-number">0</span>
+          }
+        }
+      },
+      <span class="hljs-attr">"errorMsg"</span>: <span class="hljs-literal">null</span>
+    },
+    <span class="hljs-attr">"type"</span>: <span class="hljs-string">"ingestionStatsAndErrors"</span>
+  }
+}
+</code></pre>
+<p>A description of the fields:</p>
+<p>The <code>ingestionStatsAndErrors</code> report provides information about row counts and errors.</p>
+<p>The <code>ingestionState</code> shows what step of ingestion the task reached. Possible states include:</p>
+<ul>
+<li><code>NOT_STARTED</code>: The task has not begun reading any rows</li>
+<li><code>DETERMINE_PARTITIONS</code>: The task is processing rows to determine partitioning</li>
+<li><code>BUILD_SEGMENTS</code>: The task is processing rows to construct segments</li>
+<li><code>COMPLETED</code>: The task has finished its work.</li>
+</ul>
+<p>Only batch tasks have the DETERMINE_PARTITIONS phase. Realtime tasks such as those created by the Kafka Indexing Service do not have a DETERMINE_PARTITIONS phase.</p>
+<p><code>unparseableEvents</code> contains lists of exception messages that were caused by unparseable inputs. This can help with identifying problematic input rows. There will be one list each for the DETERMINE_PARTITIONS and BUILD_SEGMENTS phases. Note that the Hadoop batch task does not support saving of unparseable events.</p>
+<p>the <code>rowStats</code> map contains information about row counts. There is one entry for each ingestion phase. The definitions of the different row counts are shown below:</p>
+<ul>
+<li><code>processed</code>: Number of rows successfully ingested without parsing errors</li>
+<li><code>processedWithError</code>: Number of rows that were ingested, but contained a parsing error within one or more columns. This typically occurs where input rows have a parseable structure but invalid types for columns, such as passing in a non-numeric String value for a numeric column.</li>
+<li><code>thrownAway</code>: Number of rows skipped. This includes rows with timestamps that were outside of the ingestion task's defined time interval and rows that were filtered out with a <a href="/docs/0.20.0/ingestion/index.html#transformspec"><code>transformSpec</code></a>, but doesn't include the rows skipped by explicit user configurations. For example, the rows skipped by <code>skipHeaderRows</code> or <code>hasHeaderRow</code> in the CSV format are not counted.</li>
+<li><code>unparseable</code>: Number of rows that could not be parsed at all and were discarded. This tracks input rows without a parseable structure, such as passing in non-JSON data when using a JSON parser.</li>
+</ul>
+<p>The <code>errorMsg</code> field shows a message describing the error that caused a task to fail. It will be null if the task was successful.</p>
+<h2><a class="anchor" aria-hidden="true" id="live-reports"></a><a href="#live-reports" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Live reports</h2>
+<h3><a class="anchor" aria-hidden="true" id="row-stats"></a><a href="#row-stats" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Row stats</h3>
+<p>The non-parallel <a href="/docs/0.20.0/ingestion/native-batch.html#simple-task">simple native batch task</a>, the Hadoop batch task, and Kafka and Kinesis ingestion tasks support retrieval of row stats while the task is running.</p>
+<p>The live report can be accessed with a GET to the following URL on a Peon running a task:</p>
+<pre><code class="hljs">http:<span class="hljs-regexp">//</span>&lt;middlemanager-host&gt;:&lt;worker-port&gt;<span class="hljs-regexp">/druid/</span>worker<span class="hljs-regexp">/v1/</span>chat<span class="hljs-regexp">/&lt;task-id&gt;/</span>rowStats
+</code></pre>
+<p>An example report is shown below. The <code>movingAverages</code> section contains 1 minute, 5 minute, and 15 minute moving averages of increases to the four row counters, which have the same definitions as those in the completion report. The <code>totals</code> section shows the current totals.</p>
+<pre><code class="hljs">{
+  <span class="hljs-attr">"movingAverages"</span>: {
+    <span class="hljs-attr">"buildSegments"</span>: {
+      <span class="hljs-attr">"5m"</span>: {
+        <span class="hljs-attr">"processed"</span>: <span class="hljs-number">3.392158326408501</span>,
+        <span class="hljs-attr">"unparseable"</span>: <span class="hljs-number">0</span>,
+        <span class="hljs-attr">"thrownAway"</span>: <span class="hljs-number">0</span>,
+        <span class="hljs-attr">"processedWithError"</span>: <span class="hljs-number">0</span>
+      },
+      <span class="hljs-attr">"15m"</span>: {
+        <span class="hljs-attr">"processed"</span>: <span class="hljs-number">1.736165476881023</span>,
+        <span class="hljs-attr">"unparseable"</span>: <span class="hljs-number">0</span>,
+        <span class="hljs-attr">"thrownAway"</span>: <span class="hljs-number">0</span>,
+        <span class="hljs-attr">"processedWithError"</span>: <span class="hljs-number">0</span>
+      },
+      <span class="hljs-attr">"1m"</span>: {
+        <span class="hljs-attr">"processed"</span>: <span class="hljs-number">4.206417693750045</span>,
+        <span class="hljs-attr">"unparseable"</span>: <span class="hljs-number">0</span>,
+        <span class="hljs-attr">"thrownAway"</span>: <span class="hljs-number">0</span>,
+        <span class="hljs-attr">"processedWithError"</span>: <span class="hljs-number">0</span>
+      }
+    }
+  },
+  <span class="hljs-attr">"totals"</span>: {
+    <span class="hljs-attr">"buildSegments"</span>: {
+      <span class="hljs-attr">"processed"</span>: <span class="hljs-number">1994</span>,
+      <span class="hljs-attr">"processedWithError"</span>: <span class="hljs-number">0</span>,
+      <span class="hljs-attr">"thrownAway"</span>: <span class="hljs-number">0</span>,
+      <span class="hljs-attr">"unparseable"</span>: <span class="hljs-number">0</span>
+    }
+  }
+}
+</code></pre>
+<p>For the Kafka Indexing Service, a GET to the following Overlord API will retrieve live row stat reports from each task being managed by the supervisor and provide a combined report.</p>
+<pre><code class="hljs">http:<span class="hljs-regexp">//</span>&lt;OVERLORD-HOST&gt;:&lt;OVERLORD-PORT&gt;<span class="hljs-regexp">/druid/i</span>ndexer<span class="hljs-regexp">/v1/</span>supervisor<span class="hljs-regexp">/&lt;supervisor-id&gt;/</span>stats
+</code></pre>
+<h3><a class="anchor" aria-hidden="true" id="unparseable-events"></a><a href="#unparseable-events" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Unparseable events</h3>
+<p>Lists of recently-encountered unparseable events can be retrieved from a running task with a GET to the following Peon API:</p>
+<pre><code class="hljs">http:<span class="hljs-regexp">//</span>&lt;middlemanager-host&gt;:&lt;worker-port&gt;<span class="hljs-regexp">/druid/</span>worker<span class="hljs-regexp">/v1/</span>chat<span class="hljs-regexp">/&lt;task-id&gt;/u</span>nparseableEvents
+</code></pre>
+<p>Note that this functionality is not supported by all task types. Currently, it is only supported by the
+non-parallel <a href="/docs/0.20.0/ingestion/native-batch.html">native batch task</a> (type <code>index</code>) and the tasks created by the Kafka
+and Kinesis indexing services.</p>
+<p><a name="locks"></a></p>
+<h2><a class="anchor" aria-hidden="true" id="task-lock-system"></a><a href="#task-lock-system" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Task lock system</h2>
+<p>This section explains the task locking system in Druid. Druid's locking system
+and versioning system are tightly coupled with each other to guarantee the correctness of ingested data.</p>
+<h2><a class="anchor" aria-hidden="true" id="overshadowing-between-segments"></a><a href="#overshadowing-between-segments" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>&quot;Overshadowing&quot; between segments</h2>
+<p>You can run a task to overwrite existing data. The segments created by an overwriting task <em>overshadows</em> existing segments.
+Note that the overshadow relation holds only for the same time chunk and the same data source.
+These overshadowed segments are not considered in query processing to filter out stale data.</p>
+<p>Each segment has a <em>major</em> version and a <em>minor</em> version. The major version is
+represented as a timestamp in the format of <a href="https://www.joda.org/joda-time/apidocs/org/joda/time/format/DateTimeFormat.html"><code>&quot;yyyy-MM-dd'T'hh:mm:ss&quot;</code></a>
+while the minor version is an integer number. These major and minor versions
+are used to determine the overshadow relation between segments as seen below.</p>
+<p>A segment <code>s1</code> overshadows another <code>s2</code> if</p>
+<ul>
+<li><code>s1</code> has a higher major version than <code>s2</code>, or</li>
+<li><code>s1</code> has the same major version and a higher minor version than <code>s2</code>.</li>
+</ul>
+<p>Here are some examples.</p>
+<ul>
+<li>A segment of the major version of <code>2019-01-01T00:00:00.000Z</code> and the minor version of <code>0</code> overshadows
+another of the major version of <code>2018-01-01T00:00:00.000Z</code> and the minor version of <code>1</code>.</li>
+<li>A segment of the major version of <code>2019-01-01T00:00:00.000Z</code> and the minor version of <code>1</code> overshadows
+another of the major version of <code>2019-01-01T00:00:00.000Z</code> and the minor version of <code>0</code>.</li>
+</ul>
+<h2><a class="anchor" aria-hidden="true" id="locking"></a><a href="#locking" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Locking</h2>
+<p>If you are running two or more <a href="./tasks.html">druid tasks</a> which generate segments for the same data source and the same time chunk,
+the generated segments could potentially overshadow each other, which could lead to incorrect query results.</p>
+<p>To avoid this problem, tasks will attempt to get locks prior to creating any segment in Druid.
+There are two types of locks, i.e., <em>time chunk lock</em> and <em>segment lock</em>.</p>
+<p>When the time chunk lock is used, a task locks the entire time chunk of a data source where generated segments will be written.
+For example, suppose we have a task ingesting data into the time chunk of <code>2019-01-01T00:00:00.000Z/2019-01-02T00:00:00.000Z</code> of the <code>wikipedia</code> data source.
+With the time chunk locking, this task will lock the entire time chunk of <code>2019-01-01T00:00:00.000Z/2019-01-02T00:00:00.000Z</code> of the <code>wikipedia</code> data source
+before it creates any segments. As long as it holds the lock, any other tasks will be unable to create segments for the same time chunk of the same data source.
+The segments created with the time chunk locking have a <em>higher</em> major version than existing segments. Their minor version is always <code>0</code>.</p>
+<p>When the segment lock is used, a task locks individual segments instead of the entire time chunk.
+As a result, two or more tasks can create segments for the same time chunk of the same data source simultaneously
+if they are reading different segments.
+For example, a Kafka indexing task and a compaction task can always write segments into the same time chunk of the same data source simultaneously.
+The reason for this is because a Kafka indexing task always appends new segments, while a compaction task always overwrites existing segments.
+The segments created with the segment locking have the <em>same</em> major version and a <em>higher</em> minor version.</p>
+<blockquote>
+<p>The segment locking is still experimental. It could have unknown bugs which potentially lead to incorrect query results.</p>
+</blockquote>
+<p>To enable segment locking, you may need to set <code>forceTimeChunkLock</code> to <code>false</code> in the <a href="#context">task context</a>.
+Once <code>forceTimeChunkLock</code> is unset, the task will choose a proper lock type to use automatically.
+Please note that segment lock is not always available. The most common use case where time chunk lock is enforced is
+when an overwriting task changes the segment granularity.
+Also, the segment locking is supported by only native indexing tasks and Kafka/Kinesis indexing tasks.
+Hadoop indexing tasks and <code>index_realtime</code> tasks (used by <a href="/docs/0.20.0/ingestion/tranquility.html">Tranquility</a>) don't support it yet.</p>
+<p><code>forceTimeChunkLock</code> in the task context is only applied to individual tasks.
+If you want to unset it for all tasks, you would want to set <code>druid.indexer.tasklock.forceTimeChunkLock</code> to false in the <a href="../configuration/index.html#overlord-operations">overlord configuration</a>.</p>
+<p>Lock requests can conflict with each other if two or more tasks try to get locks for the overlapped time chunks of the same data source.
+Note that the lock conflict can happen between different locks types.</p>
+<p>The behavior on lock conflicts depends on the <a href="#lock-priority">task priority</a>.
+If all tasks of conflicting lock requests have the same priority, then the task who requested first will get the lock.
+Other tasks will wait for the task to release the lock.</p>
+<p>If a task of a lower priority asks a lock later than another of a higher priority,
+this task will also wait for the task of a higher priority to release the lock.
+If a task of a higher priority asks a lock later than another of a lower priority,
+then this task will <em>preempt</em> the other task of a lower priority. The lock
+of the lower-prioritized task will be revoked and the higher-prioritized task will acquire a new lock.</p>
+<p>This lock preemption can happen at any time while a task is running except
+when it is <em>publishing segments</em> in a critical section. Its locks become preemptible again once publishing segments is finished.</p>
+<p>Note that locks are shared by the tasks of the same groupId.
+For example, Kafka indexing tasks of the same supervisor have the same groupId and share all locks with each other.</p>
+<p><a name="priority"></a></p>
+<h2><a class="anchor" aria-hidden="true" id="lock-priority"></a><a href="#lock-priority" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Lock priority</h2>
+<p>Each task type has a different default lock priority. The below table shows the default priorities of different task types. Higher the number, higher the priority.</p>
+<table>
+<thead>
+<tr><th>task type</th><th>default priority</th></tr>
+</thead>
+<tbody>
+<tr><td>Realtime index task</td><td>75</td></tr>
+<tr><td>Batch index task</td><td>50</td></tr>
+<tr><td>Merge/Append/Compaction task</td><td>25</td></tr>
+<tr><td>Other tasks</td><td>0</td></tr>
+</tbody>
+</table>
+<p>You can override the task priority by setting your priority in the task context as below.</p>
+<pre><code class="hljs css language-json">"context" : {
+  "priority" : 100
+}
+</code></pre>
+<p><a name="context"></a></p>
+<h2><a class="anchor" aria-hidden="true" id="context-parameters"></a><a href="#context-parameters" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Context parameters</h2>
+<p>The task context is used for various individual task configuration. The following parameters apply to all task types.</p>
+<table>
+<thead>
+<tr><th>property</th><th>default</th><th>description</th></tr>
+</thead>
+<tbody>
+<tr><td>taskLockTimeout</td><td>300000</td><td>task lock timeout in millisecond. For more details, see <a href="#locking">Locking</a>.</td></tr>
+<tr><td>forceTimeChunkLock</td><td>true</td><td><em>Setting this to false is still experimental</em><br/> Force to always use time chunk lock. If not set, each task automatically chooses a lock type to use. If this set, it will overwrite the <code>druid.indexer.tasklock.forceTimeChunkLock</code> <a href="../configuration/index.html#overlord-operations">configuration for the overlord</a>. See <a href="#locking">Locking</a> for more details.</td></tr>
+<tr><td>priority</td><td>Different based on task types. See <a href="#priority">Priority</a>.</td><td>Task priority</td></tr>
+</tbody>
+</table>
+<blockquote>
+<p>When a task acquires a lock, it sends a request via HTTP and awaits until it receives a response containing the lock acquisition result.
+As a result, an HTTP timeout error can occur if <code>taskLockTimeout</code> is greater than <code>druid.server.http.maxIdleTime</code> of Overlords.</p>
+</blockquote>
+<h2><a class="anchor" aria-hidden="true" id="all-task-types"></a><a href="#all-task-types" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>All task types</h2>
+<h3><a class="anchor" aria-hidden="true" id="index"></a><a href="#index" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a><code>index</code></h3>
+<p>See <a href="/docs/0.20.0/ingestion/native-batch.html#simple-task">Native batch ingestion (simple task)</a>.</p>
+<h3><a class="anchor" aria-hidden="true" id="index_parallel"></a><a href="#index_parallel" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a><code>index_parallel</code></h3>
+<p>See <a href="/docs/0.20.0/ingestion/native-batch.html#parallel-task">Native batch ingestion (parallel task)</a>.</p>
+<h3><a class="anchor" aria-hidden="true" id="index_sub"></a><a href="#index_sub" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a><code>index_sub</code></h3>
+<p>Submitted automatically, on your behalf, by an <a href="#index_parallel"><code>index_parallel</code></a> task.</p>
+<h3><a class="anchor" aria-hidden="true" id="index_hadoop"></a><a href="#index_hadoop" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a><code>index_hadoop</code></h3>
+<p>See <a href="/docs/0.20.0/ingestion/hadoop.html">Hadoop-based ingestion</a>.</p>
+<h3><a class="anchor" aria-hidden="true" id="index_kafka"></a><a href="#index_kafka" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a><code>index_kafka</code></h3>
+<p>Submitted automatically, on your behalf, by a
+<a href="/docs/0.20.0/development/extensions-core/kafka-ingestion.html">Kafka-based ingestion supervisor</a>.</p>
+<h3><a class="anchor" aria-hidden="true" id="index_kinesis"></a><a href="#index_kinesis" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a><code>index_kinesis</code></h3>
+<p>Submitted automatically, on your behalf, by a
+<a href="/docs/0.20.0/development/extensions-core/kinesis-ingestion.html">Kinesis-based ingestion supervisor</a>.</p>
+<h3><a class="anchor" aria-hidden="true" id="index_realtime"></a><a href="#index_realtime" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a><code>index_realtime</code></h3>
+<p>Submitted automatically, on your behalf, by <a href="/docs/0.20.0/ingestion/tranquility.html">Tranquility</a>.</p>
+<h3><a class="anchor" aria-hidden="true" id="compact"></a><a href="#compact" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a><code>compact</code></h3>
+<p>Compaction tasks merge all segments of the given interval. See the documentation on
+<a href="/docs/0.20.0/ingestion/data-management.html#compaction-and-reindexing">compaction</a> for details.</p>
+<h3><a class="anchor" aria-hidden="true" id="kill"></a><a href="#kill" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a><code>kill</code></h3>
+<p>Kill tasks delete all metadata about certain segments and removes them from deep storage.
+See the documentation on <a href="/docs/0.20.0/ingestion/data-management.html#delete">deleting data</a> for details.</p>
+</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/0.20.0/ingestion/hadoop.html"><span class="arrow-prev">← </span><span>Hadoop-based</span></a><a class="docs-next button" href="/docs/0.20.0/ingestion/faq.html"><span>Troubleshooting FAQ</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#task-api">Task API</a></li><li><a href="#task-reports">Task reports</a><ul class="toc-headings"><li><a href="#completion-report">Completion report</a></li><li><a href="#live-report">Live report</a></li></ul></li><li><a href="#live-reports">Live reports</a><ul class="toc-headings"><li><a href="#row-stats">Row stats</a></li><li><a href="#unparseable-events">Unparseable events</a></li></ul></li><li><a href="#task-lock-system">Task lock system</a></li><li><a href="#overshadowing-between-segments">&quot;Overshadowing&quot; between segments</a></li><li><a href="#locking">Locking</a></li><li><a href="#lock-priority">Lock priority</a></li><li><a href="#context-parameters">Context parameters</a></li><li><a href="#all-task-types">All task types</a><ul class="toc-headings"><li><a href="#index"><code>index</code></a></li><li><a href="#index_parallel"><code>index_parallel</code></a></li><li><a href="#index_sub"><code>index_sub</code></a></li><li><a href="#index_hadoop"><code>index_hadoop</code></a></li><li><a href="#index_kafka"><code>index_kafka</code></a></li><li><a href="#index_kinesis"><code>index_kinesis</code></a></li><li><a href="#index_realtime"><code>index_realtime</code></a></li><li><a href="#compact"><code>compact</code></a></li><li><a href="#kill"><code>kill</code></a></li></ul></li></ul></nav></div><footer class="nav-footer druid-footer" id="footer"><div class="container"><div class="text-center"><p><a href="/technology">Technology</a> · <a href="/use-cases">Use Cases</a> · <a href="/druid-powered">Powered by Druid</a> · <a href="/docs/0.20.0/latest">Docs</a> · <a href="/community/">Community</a> · <a href="/downloads.html">Download</a> · <a href="/faq">FAQ</a></p></div><div class="text-center"><a title="Join the user group" href="https://groups.google.com/forum/#!forum/druid-user" target="_blank"><span class="fa fa-comments"></span></a> · <a title="Follow Druid" href="https://twitter.com/druidio" target="_blank"><span class="fab fa-twitter"></span></a> · <a title="Download via Apache" href="https://www.apache.org/dyn/closer.cgi?path=/incubator/druid/{{ site.druid_versions[0].versions[0].version }}/apache-druid-{{ site.druid_versions[0].versions[0].version }}-bin.tar.gz" target="_blank"><span class="fas fa-feather"></span></a> · <a title="GitHub" href="https://github.com/apache/druid" target="_blank"><span class="fab fa-github"></span></a></div><div class="text-center license">Copyright © 2019 <a href="https://www.apache.org/" target="_blank">Apache Software Foundation</a>.<br/>Except where otherwise noted, licensed under <a rel="license" href="http://creativecommons.org/licenses/by-sa/4.0/">CC BY-SA 4.0</a>.<br/>Apache Druid, Druid, and the Druid logo are either registered trademarks or trademarks of The Apache Software Foundation in the United States and other countries.</div></div></footer></div><script type="text/javascript" src="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.js"></script><script>
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+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
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+  ~ regarding copyright ownership.  The ASF licenses this file
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+<p><a href="https://github.com/druid-io/tranquility/">Tranquility</a> is a package for pushing
+streams to Druid in real-time. Druid does not come bundled with Tranquility; it is available as a separate download.</p>
+<p>Note that as of this writing, the latest available version of Tranquility is built against the rather old Druid 0.9.2
+release. It will still work with the latest Druid servers, but not all features and functionality will be available
+due to limitations of older Druid APIs on the Tranquility side.</p>
+<p>For new projects that require streaming ingestion, we recommend using Druid's native support for
+<a href="/docs/0.20.0/development/extensions-core/kafka-ingestion.html">Apache Kafka</a> or
+<a href="/docs/0.20.0/development/extensions-core/kinesis-ingestion.html">Amazon Kinesis</a>.</p>
+<p>For more details, check out the <a href="https://github.com/druid-io/tranquility/">Tranquility GitHub page</a>.</p>
+</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/0.20.0/development/extensions-core/kinesis-ingestion.html"><span class="arrow-prev">← </span><span>Amazon Kinesis</span></a><a class="docs-next button" href="/docs/0.20.0/ingestion/standalone-realtime.html"><span>Realtime Process</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"></nav></div><footer class="nav-footer druid-footer" id="footer"><div class="container"><div class="text-center"><p><a href="/technology">Technology</a> · <a href="/use-cases">Use Cases</a> · <a href="/druid-powered">Powered by Druid</a> · <a href="/docs/0.20.0/latest">Docs</a> · <a href="/community/">Community</a> · <a href="/downloads.html">Download</a> · <a href="/faq">FAQ</a></p></div><div class="text-center"><a title="Join the user group" href="https://groups.google.com/forum/#!forum/druid-user" target="_blank"><span class="fa fa-comments"></span></a> · <a title="Follow Druid" href="https://twitter.com/druidio" target="_blank"><span class="fab fa-twitter"></span></a> · <a title="Download via Apache" href="https://www.apache.org/dyn/closer.cgi?path=/incubator/druid/{{ site.druid_versions[0].versions[0].version }}/apache-druid-{{ site.druid_versions[0].versions[0].version }}-bin.tar.gz" target="_blank"><span class="fas fa-feather"></span></a> · <a title="GitHub" href="https://github.com/apache/druid" target="_blank"><span class="fab fa-github"></span></a></div><div class="text-center license">Copyright © 2019 <a href="https://www.apache.org/" target="_blank">Apache Software Foundation</a>.<br/>Except where otherwise noted, licensed under <a rel="license" href="http://creativecommons.org/licenses/by-sa/4.0/">CC BY-SA 4.0</a>.<br/>Apache Druid, Druid, and the Druid logo are either registered trademarks or trademarks of The Apache Software Foundation in the United States and other countries.</div></div></footer></div><script type="text/javascript" src="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.js"></script><script>
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+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Expressions · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/0.20.0/misc/math-expr.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.20.0" /><meta property="og:title" content="Expressions · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
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class="icon-toc"></i></div></div><div class="navGroups"><div class="navGroup"><h3 class="navGroupCategoryTitle collapsible">Getting started<span class="arrow"><svg width="24" height="24" viewBox="0 0 24 24"><path fill="#565656" d="M7.41 15.41L12 10.83l4.59 4.58L18 14l-6-6-6 6z"></path><path d="M0 0h24v24H0z" fill="none"></path></svg></span></h3><ul class="hide"><li class="navListItem"><a class="navItem" href="/docs/0.20.0/design/index.html">Introduction to Apache Druid</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/tutorials/index.html">Quickstart</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/tutorials/docker.html">Docker</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/operations/single-server.html">Single server deployment</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/tutorials/cluster.html">Clustered deployment</a></li></ul></div><div class="navGroup"><h3 class="navGroupCategoryTitle 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+                  target.classList.toggle(className);
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+        </script></nav></div><div class="container mainContainer docsContainer"><div class="wrapper"><div class="post"><header class="postHeader"><a class="edit-page-link button" href="https://github.com/apache/druid/edit/master/docs/misc/math-expr.md" target="_blank" rel="noreferrer noopener">Edit</a><h1 id="__docusaurus" class="postHeaderTitle">Expressions</h1></header><article><div><span><!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
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+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+  -->
+<blockquote>
+<p>Apache Druid supports two query languages: <a href="/docs/0.20.0/querying/querying.html">native queries</a> and <a href="/docs/0.20.0/querying/sql.html">Druid SQL</a>.
+This document describes the native language. For information about functions available in SQL, refer to the
+<a href="/docs/0.20.0/querying/sql.html#scalar-functions">SQL documentation</a>.</p>
+</blockquote>
+<p>Expressions are used in various places in the native query language, including
+<a href="/docs/0.20.0/querying/virtual-columns.html">virtual columns</a> and <a href="/docs/0.20.0/querying/datasource.html#join">join conditions</a>. They are
+also generated by most <a href="/docs/0.20.0/querying/sql.html#scalar-functions">Druid SQL functions</a> during the
+<a href="/docs/0.20.0/querying/sql.html#query-translation">query translation</a> process.</p>
+<p>This expression language supports the following operators (listed in decreasing order of precedence).</p>
+<table>
+<thead>
+<tr><th>Operators</th><th>Description</th></tr>
+</thead>
+<tbody>
+<tr><td>!, -</td><td>Unary NOT and Minus</td></tr>
+<tr><td>^</td><td>Binary power op</td></tr>
+<tr><td>*, /, %</td><td>Binary multiplicative</td></tr>
+<tr><td>+, -</td><td>Binary additive</td></tr>
+<tr><td>&lt;, &lt;=, &gt;, &gt;=, ==, !=</td><td>Binary Comparison</td></tr>
+<tr><td>&amp;&amp;, ||</td><td>Binary Logical AND, OR</td></tr>
+</tbody>
+</table>
+<p>Long, double, and string data types are supported. If a number contains a dot, it is interpreted as a double, otherwise it is interpreted as a long. That means, always add a '.' to your number if you want it interpreted as a double value. String literals should be quoted by single quotation marks.</p>
+<p>Additionally, the expression language supports long, double, and string arrays. Array literals are created by wrapping square brackets around a list of scalar literals values delimited by a comma or space character. All values in an array literal must be the same type, however null values are accepted. Typed empty arrays may be defined by prefixing with their type in angle brackets: <code>&lt;STRING&gt;[]</code>, <code>&lt;DOUBLE&gt;[]</code>, or <code>&lt;LONG&gt;[]</code>.</p>
+<p>Expressions can contain variables. Variable names may contain letters, digits, '_' and '$'. Variable names must not begin with a digit. To escape other special characters, you can quote it with double quotation marks.</p>
+<p>For logical operators, a number is true if and only if it is positive (0 or negative value means false). For string type, it's the evaluation result of 'Boolean.valueOf(string)'.</p>
+<p><a href="../querying/multi-value-dimensions.html">Multi-value string dimensions</a> are supported and may be treated as either scalar or array typed values. When treated as a scalar type, an expression will automatically be transformed to apply the scalar operation across all values of the multi-valued type, to mimic Druid's native behavior. Values that result in arrays will be coerced back into the native Druid string type for aggregation. Druid aggregations on multi-value string dimensions on the individual values, <em>not</em> the 'array', behaving similar to the <code>UNNEST</code> operator available in many SQL dialects. However, by using the <code>array_to_string</code> function, aggregations may be done on a stringified version of the complete array, allowing the complete row to be preserved. Using <code>string_to_array</code> in an expression post-aggregator, allows transforming the stringified dimension back into the true native array type.</p>
+<p>The following built-in functions are available.</p>
+<h2><a class="anchor" aria-hidden="true" id="general-functions"></a><a href="#general-functions" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>General functions</h2>
+<table>
+<thead>
+<tr><th>name</th><th>description</th></tr>
+</thead>
+<tbody>
+<tr><td>cast</td><td>cast(expr,'LONG' or 'DOUBLE' or 'STRING' or 'LONG_ARRAY', or 'DOUBLE_ARRAY' or 'STRING_ARRAY') returns expr with specified type. exception can be thrown. Scalar types may be cast to array types and will take the form of a single element list (null will still be null).</td></tr>
+<tr><td>if</td><td>if(predicate,then,else) returns 'then' if 'predicate' evaluates to a positive number, otherwise it returns 'else'</td></tr>
+<tr><td>nvl</td><td>nvl(expr,expr-for-null) returns 'expr-for-null' if 'expr' is null (or empty string for string type)</td></tr>
+<tr><td>like</td><td>like(expr, pattern[, escape]) is equivalent to SQL <code>expr LIKE pattern</code></td></tr>
+<tr><td>case_searched</td><td>case_searched(expr1, result1, [[expr2, result2, ...], else-result])</td></tr>
+<tr><td>case_simple</td><td>case_simple(expr, value1, result1, [[value2, result2, ...], else-result])</td></tr>
+<tr><td>bloom_filter_test</td><td>bloom_filter_test(expr, filter) tests the value of 'expr' against 'filter', a bloom filter serialized as a base64 string. See <a href="/docs/0.20.0/development/extensions-core/bloom-filter.html">bloom filter extension</a> documentation for additional details.</td></tr>
+</tbody>
+</table>
+<h2><a class="anchor" aria-hidden="true" id="string-functions"></a><a href="#string-functions" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>String functions</h2>
+<table>
+<thead>
+<tr><th>name</th><th>description</th></tr>
+</thead>
+<tbody>
+<tr><td>concat</td><td>concat(expr, expr...) concatenate a list of strings</td></tr>
+<tr><td>format</td><td>format(pattern[, args...]) returns a string formatted in the manner of Java's <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html#format-java.lang.String-java.lang.Object...-">String.format</a>.</td></tr>
+<tr><td>like</td><td>like(expr, pattern[, escape]) is equivalent to SQL <code>expr LIKE pattern</code></td></tr>
+<tr><td>lookup</td><td>lookup(expr, lookup-name) looks up expr in a registered <a href="/docs/0.20.0/querying/lookups.html">query-time lookup</a></td></tr>
+<tr><td>parse_long</td><td>parse_long(string[, radix]) parses a string as a long with the given radix, or 10 (decimal) if a radix is not provided.</td></tr>
+<tr><td>regexp_extract</td><td>regexp_extract(expr, pattern[, index]) applies a regular expression pattern and extracts a capture group index, or null if there is no match. If index is unspecified or zero, returns the substring that matched the pattern. The pattern may match anywhere inside <code>expr</code>; if you want to match the entire string instead, use the <code>^</code> and <code>$</code> markers at the start and end of your pattern.</td></tr>
+<tr><td>regexp_like</td><td>regexp_like(expr, pattern) returns whether <code>expr</code> matches regular expression <code>pattern</code>. The pattern may match anywhere inside <code>expr</code>; if you want to match the entire string instead, use the <code>^</code> and <code>$</code> markers at the start and end of your pattern.</td></tr>
+<tr><td>contains_string</td><td>contains_string(expr, string) returns whether <code>expr</code> contains <code>string</code> as a substring. This method is case-sensitive.</td></tr>
+<tr><td>icontains_string</td><td>contains_string(expr, string) returns whether <code>expr</code> contains <code>string</code> as a substring. This method is case-insensitive.</td></tr>
+<tr><td>replace</td><td>replace(expr, pattern, replacement) replaces pattern with replacement</td></tr>
+<tr><td>substring</td><td>substring(expr, index, length) behaves like java.lang.String's substring</td></tr>
+<tr><td>right</td><td>right(expr, length) returns the rightmost length characters from a string</td></tr>
+<tr><td>left</td><td>left(expr, length) returns the leftmost length characters from a string</td></tr>
+<tr><td>strlen</td><td>strlen(expr) returns length of a string in UTF-16 code units</td></tr>
+<tr><td>strpos</td><td>strpos(haystack, needle[, fromIndex]) returns the position of the needle within the haystack, with indexes starting from 0. The search will begin at fromIndex, or 0 if fromIndex is not specified. If the needle is not found then the function returns -1.</td></tr>
+<tr><td>trim</td><td>trim(expr[, chars]) remove leading and trailing characters from <code>expr</code> if they are present in <code>chars</code>. <code>chars</code> defaults to ' ' (space) if not provided.</td></tr>
+<tr><td>ltrim</td><td>ltrim(expr[, chars]) remove leading characters from <code>expr</code> if they are present in <code>chars</code>. <code>chars</code> defaults to ' ' (space) if not provided.</td></tr>
+<tr><td>rtrim</td><td>rtrim(expr[, chars]) remove trailing characters from <code>expr</code> if they are present in <code>chars</code>. <code>chars</code> defaults to ' ' (space) if not provided.</td></tr>
+<tr><td>lower</td><td>lower(expr) converts a string to lowercase</td></tr>
+<tr><td>upper</td><td>upper(expr) converts a string to uppercase</td></tr>
+<tr><td>reverse</td><td>reverse(expr) reverses a string</td></tr>
+<tr><td>repeat</td><td>repeat(expr, N) repeats a string N times</td></tr>
+<tr><td>lpad</td><td>lpad(expr, length, chars) returns a string of <code>length</code> from <code>expr</code> left-padded with <code>chars</code>. If <code>length</code> is shorter than the length of <code>expr</code>, the result is <code>expr</code> which is truncated to <code>length</code>. The result will be null if either <code>expr</code> or <code>chars</code> is null. If <code>chars</code> is an empty string, no padding is added, however <code>expr</code> may be trimmed if necessary.</td></tr>
+<tr><td>rpad</td><td>rpad(expr, length, chars) returns a string of <code>length</code> from <code>expr</code> right-padded with <code>chars</code>. If <code>length</code> is shorter than the length of <code>expr</code>, the result is <code>expr</code> which is truncated to <code>length</code>. The result will be null if either <code>expr</code> or <code>chars</code> is null. If <code>chars</code> is an empty string, no padding is added, however <code>expr</code> may be trimmed if necessary.</td></tr>
+</tbody>
+</table>
+<h2><a class="anchor" aria-hidden="true" id="time-functions"></a><a href="#time-functions" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Time functions</h2>
+<table>
+<thead>
+<tr><th>name</th><th>description</th></tr>
+</thead>
+<tbody>
+<tr><td>timestamp</td><td>timestamp(expr[,format-string]) parses string expr into date then returns milliseconds from java epoch. without 'format-string' it's regarded as ISO datetime format</td></tr>
+<tr><td>unix_timestamp</td><td>same with 'timestamp' function but returns seconds instead</td></tr>
+<tr><td>timestamp_ceil</td><td>timestamp_ceil(expr, period, [origin, [timezone]]) rounds up a timestamp, returning it as a new timestamp. Period can be any ISO8601 period, like P3M (quarters) or PT12H (half-days). The time zone, if provided, should be a time zone name like &quot;America/Los_Angeles&quot; or offset like &quot;-08:00&quot;.</td></tr>
+<tr><td>timestamp_floor</td><td>timestamp_floor(expr, period, [origin, [timezone]]) rounds down a timestamp, returning it as a new timestamp. Period can be any ISO8601 period, like P3M (quarters) or PT12H (half-days). The time zone, if provided, should be a time zone name like &quot;America/Los_Angeles&quot; or offset like &quot;-08:00&quot;.</td></tr>
+<tr><td>timestamp_shift</td><td>timestamp_shift(expr, period, step, [timezone]) shifts a timestamp by a period (step times), returning it as a new timestamp. Period can be any ISO8601 period. Step may be negative. The time zone, if provided, should be a time zone name like &quot;America/Los_Angeles&quot; or offset like &quot;-08:00&quot;.</td></tr>
+<tr><td>timestamp_extract</td><td>timestamp_extract(expr, unit, [timezone]) extracts a time part from expr, returning it as a number. Unit can be EPOCH (number of seconds since 1970-01-01 00:00:00 UTC), SECOND, MINUTE, HOUR, DAY (day of month), DOW (day of week), DOY (day of year), WEEK (week of <a href="https://en.wikipedia.org/wiki/ISO_week_date">week year</a>), MONTH (1 through 12), QUARTER (1 through 4), or YEAR. The time zone, if provided, should be a time zone name like &quot;America/Los_Angeles&quot; or offset like &quot;-08:00&quot;</td></tr>
+<tr><td>timestamp_parse</td><td>timestamp_parse(string expr, [pattern, [timezone]]) parses a string into a timestamp using a given <a href="http://www.joda.org/joda-time/apidocs/org/joda/time/format/DateTimeFormat.html">Joda DateTimeFormat pattern</a>. If the pattern is not provided, this parses time strings in either ISO8601 or SQL format. The time zone, if provided, should be a time zone name like &quot;America/Los_Angeles&quot; or offset like &quot;-08:00&quot;, and will be used as the time zone for strings that do not include a time zone offset. Pattern and time zone must be literals. Strings that cannot be parsed as timestamps will be returned as nulls.</td></tr>
+<tr><td>timestamp_format</td><td>timestamp_format(expr, [pattern, [timezone]]) formats a timestamp as a string with a given <a href="http://www.joda.org/joda-time/apidocs/org/joda/time/format/DateTimeFormat.html">Joda DateTimeFormat pattern</a>, or ISO8601 if the pattern is not provided. The time zone, if provided, should be a time zone name like &quot;America/Los_Angeles&quot; or offset like &quot;-08:00&quot;. Pattern and time zone must be literals.</td></tr>
+</tbody>
+</table>
+<h2><a class="anchor" aria-hidden="true" id="math-functions"></a><a href="#math-functions" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Math functions</h2>
+<p>See javadoc of java.lang.Math for detailed explanation for each function.</p>
+<table>
+<thead>
+<tr><th>name</th><th>description</th></tr>
+</thead>
+<tbody>
+<tr><td>abs</td><td>abs(x) would return the absolute value of x</td></tr>
+<tr><td>acos</td><td>acos(x) would return the arc cosine of x</td></tr>
+<tr><td>asin</td><td>asin(x) would return the arc sine of x</td></tr>
+<tr><td>atan</td><td>atan(x) would return the arc tangent of x</td></tr>
+<tr><td>atan2</td><td>atan2(y, x) would return the angle theta from the conversion of rectangular coordinates (x, y) to polar * coordinates (r, theta)</td></tr>
+<tr><td>cbrt</td><td>cbrt(x) would return the cube root of x</td></tr>
+<tr><td>ceil</td><td>ceil(x) would return the smallest (closest to negative infinity) double value that is greater than or equal to x and is equal to a mathematical integer</td></tr>
+<tr><td>copysign</td><td>copysign(x) would return the first floating-point argument with the sign of the second floating-point argument</td></tr>
+<tr><td>cos</td><td>cos(x) would return the trigonometric cosine of x</td></tr>
+<tr><td>cosh</td><td>cosh(x) would return the hyperbolic cosine of x</td></tr>
+<tr><td>cot</td><td>cot(x) would return the trigonometric cotangent of an angle x</td></tr>
+<tr><td>div</td><td>div(x,y) is integer division of x by y</td></tr>
+<tr><td>exp</td><td>exp(x) would return Euler's number raised to the power of x</td></tr>
+<tr><td>expm1</td><td>expm1(x) would return e^x-1</td></tr>
+<tr><td>floor</td><td>floor(x) would return the largest (closest to positive infinity) double value that is less than or equal to x and is equal to a mathematical integer</td></tr>
+<tr><td>getExponent</td><td>getExponent(x) would return the unbiased exponent used in the representation of x</td></tr>
+<tr><td>hypot</td><td>hypot(x, y) would return sqrt(x^2+y^2) without intermediate overflow or underflow</td></tr>
+<tr><td>log</td><td>log(x) would return the natural logarithm of x</td></tr>
+<tr><td>log10</td><td>log10(x) would return the base 10 logarithm of x</td></tr>
+<tr><td>log1p</td><td>log1p(x) would the natural logarithm of x + 1</td></tr>
+<tr><td>max</td><td>max(x, y) would return the greater of two values</td></tr>
+<tr><td>min</td><td>min(x, y) would return the smaller of two values</td></tr>
+<tr><td>nextafter</td><td>nextafter(x, y) would return the floating-point number adjacent to the x in the direction of the y</td></tr>
+<tr><td>nextUp</td><td>nextUp(x) would return the floating-point value adjacent to x in the direction of positive infinity</td></tr>
+<tr><td>pi</td><td>pi would return the constant value of the π</td></tr>
+<tr><td>pow</td><td>pow(x, y) would return the value of the x raised to the power of y</td></tr>
+<tr><td>remainder</td><td>remainder(x, y) would return the remainder operation on two arguments as prescribed by the IEEE 754 standard</td></tr>
+<tr><td>rint</td><td>rint(x) would return value that is closest in value to x and is equal to a mathematical integer</td></tr>
+<tr><td>round</td><td>round(x, y) would return the value of the x rounded to the y decimal places. While x can be an integer or floating-point number, y must be an integer. The type of the return value is specified by that of x. y defaults to 0 if omitted. When y is negative, x is rounded on the left side of the y decimal points. If x is <code>NaN</code>, x will return 0. If x is infinity, x will be converted to the nearest finite double.</td></tr>
+<tr><td>scalb</td><td>scalb(d, sf) would return d * 2^sf rounded as if performed by a single correctly rounded floating-point multiply to a member of the double value set</td></tr>
+<tr><td>signum</td><td>signum(x) would return the signum function of the argument x</td></tr>
+<tr><td>sin</td><td>sin(x) would return the trigonometric sine of an angle x</td></tr>
+<tr><td>sinh</td><td>sinh(x) would return the hyperbolic sine of x</td></tr>
+<tr><td>sqrt</td><td>sqrt(x) would return the correctly rounded positive square root of x</td></tr>
+<tr><td>tan</td><td>tan(x) would return the trigonometric tangent of an angle x</td></tr>
+<tr><td>tanh</td><td>tanh(x) would return the hyperbolic tangent of x</td></tr>
+<tr><td>todegrees</td><td>todegrees(x) converts an angle measured in radians to an approximately equivalent angle measured in degrees</td></tr>
+<tr><td>toradians</td><td>toradians(x) converts an angle measured in degrees to an approximately equivalent angle measured in radians</td></tr>
+<tr><td>ulp</td><td>ulp(x) would return the size of an ulp of the argument x</td></tr>
+</tbody>
+</table>
+<h2><a class="anchor" aria-hidden="true" id="array-functions"></a><a href="#array-functions" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Array functions</h2>
+<table>
+<thead>
+<tr><th>function</th><th>description</th></tr>
+</thead>
+<tbody>
+<tr><td>array(expr1,expr ...)</td><td>constructs an array from the expression arguments, using the type of the first argument as the output array type</td></tr>
+<tr><td>array_length(arr)</td><td>returns length of array expression</td></tr>
+<tr><td>array_offset(arr,long)</td><td>returns the array element at the 0 based index supplied, or null for an out of range index</td></tr>
+<tr><td>array_ordinal(arr,long)</td><td>returns the array element at the 1 based index supplied, or null for an out of range index</td></tr>
+<tr><td>array_contains(arr,expr)</td><td>returns 1 if the array contains the element specified by expr, or contains all elements specified by expr if expr is an array, else 0</td></tr>
+<tr><td>array_overlap(arr1,arr2)</td><td>returns 1 if arr1 and arr2 have any elements in common, else 0</td></tr>
+<tr><td>array_offset_of(arr,expr)</td><td>returns the 0 based index of the first occurrence of expr in the array, or <code>-1</code> or <code>null</code> if <code>druid.generic.useDefaultValueForNull=false</code>if no matching elements exist in the array.</td></tr>
+<tr><td>array_ordinal_of(arr,expr)</td><td>returns the 1 based index of the first occurrence of expr in the array, or <code>-1</code> or <code>null</code> if <code>druid.generic.useDefaultValueForNull=false</code> if no matching elements exist in the array.</td></tr>
+<tr><td>array_prepend(expr,arr)</td><td>adds expr to arr at the beginning, the resulting array type determined by the type of the array</td></tr>
+<tr><td>array_append(arr1,expr)</td><td>appends expr to arr, the resulting array type determined by the type of the first array</td></tr>
+<tr><td>array_concat(arr1,arr2)</td><td>concatenates 2 arrays, the resulting array type determined by the type of the first array</td></tr>
+<tr><td>array_slice(arr,start,end)</td><td>return the subarray of arr from the 0 based index start(inclusive) to end(exclusive), or <code>null</code>, if start is less than 0, greater than length of arr or less than end</td></tr>
+<tr><td>array_to_string(arr,str)</td><td>joins all elements of arr by the delimiter specified by str</td></tr>
+<tr><td>string_to_array(str1,str2)</td><td>splits str1 into an array on the delimiter specified by str2</td></tr>
+</tbody>
+</table>
+<h2><a class="anchor" aria-hidden="true" id="apply-functions"></a><a href="#apply-functions" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Apply functions</h2>
+<table>
+<thead>
+<tr><th>function</th><th>description</th></tr>
+</thead>
+<tbody>
+<tr><td>map(lambda,arr)</td><td>applies a transform specified by a single argument lambda expression to all elements of arr, returning a new array</td></tr>
+<tr><td>cartesian_map(lambda,arr1,arr2,...)</td><td>applies a transform specified by a multi argument lambda expression to all elements of the Cartesian product of all input arrays, returning a new array; the number of lambda arguments and array inputs must be the same</td></tr>
+<tr><td>filter(lambda,arr)</td><td>filters arr by a single argument lambda, returning a new array with all matching elements, or null if no elements match</td></tr>
+<tr><td>fold(lambda,arr)</td><td>folds a 2 argument lambda across arr. The first argument of the lambda is the array element and the second the accumulator, returning a single accumulated value.</td></tr>
+<tr><td>cartesian_fold(lambda,arr1,arr2,...)</td><td>folds a multi argument lambda across the Cartesian product of all input arrays. The first arguments of the lambda is the array element and the last is the accumulator, returning a single accumulated value.</td></tr>
+<tr><td>any(lambda,arr)</td><td>returns 1 if any element in the array matches the lambda expression, else 0</td></tr>
+<tr><td>all(lambda,arr)</td><td>returns 1 if all elements in the array matches the lambda expression, else 0</td></tr>
+</tbody>
+</table>
+<h2><a class="anchor" aria-hidden="true" id="reduction-functions"></a><a href="#reduction-functions" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Reduction functions</h2>
+<p>Reduction functions operate on zero or more expressions and return a single expression. If no expressions are passed as
+arguments, then the result is <code>NULL</code>. The expressions must all be convertible to a common data type, which will be the
+type of the result:</p>
+<ul>
+<li>If all arguments are <code>NULL</code>, the result is <code>NULL</code>. Otherwise, <code>NULL</code> arguments are ignored.</li>
+<li>If the arguments comprise a mix of numbers and strings, the arguments are interpreted as strings.</li>
+<li>If all arguments are integer numbers, the arguments are interpreted as longs.</li>
+<li>If all arguments are numbers and at least one argument is a double, the arguments are interpreted as doubles.</li>
+</ul>
+<table>
+<thead>
+<tr><th>function</th><th>description</th></tr>
+</thead>
+<tbody>
+<tr><td>greatest([expr1, ...])</td><td>Evaluates zero or more expressions and returns the maximum value based on comparisons as described above.</td></tr>
+<tr><td>least([expr1, ...])</td><td>Evaluates zero or more expressions and returns the minimum value based on comparisons as described above.</td></tr>
+</tbody>
+</table>
+<h2><a class="anchor" aria-hidden="true" id="ip-address-functions"></a><a href="#ip-address-functions" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>IP address functions</h2>
+<p>For the IPv4 address functions, the <code>address</code> argument can either be an IPv4 dotted-decimal string (e.g., &quot;192.168.0.1&quot;) or an IP address represented as a long (e.g., 3232235521). The <code>subnet</code> argument should be a string formatted as an IPv4 address subnet in CIDR notation (e.g., &quot;192.168.0.0/16&quot;).</p>
+<table>
+<thead>
+<tr><th>function</th><th>description</th></tr>
+</thead>
+<tbody>
+<tr><td>ipv4_match(address, subnet)</td><td>Returns 1 if the <code>address</code> belongs to the <code>subnet</code> literal, else 0. If <code>address</code> is not a valid IPv4 address, then 0 is returned. This function is more efficient if <code>address</code> is a long instead of a string.</td></tr>
+<tr><td>ipv4_parse(address)</td><td>Parses <code>address</code> into an IPv4 address stored as a long. If <code>address</code> is a long that is a valid IPv4 address, then it is passed through. Returns null if <code>address</code> cannot be represented as an IPv4 address.</td></tr>
+<tr><td>ipv4_stringify(address)</td><td>Converts <code>address</code> into an IPv4 address dotted-decimal string. If <code>address</code> is a string that is a valid IPv4 address, then it is passed through. Returns null if <code>address</code> cannot be represented as an IPv4 address.</td></tr>
+</tbody>
+</table>
+<h2><a class="anchor" aria-hidden="true" id="vectorization-support"></a><a href="#vectorization-support" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Vectorization Support</h2>
+<p>A number of expressions support <a href="/docs/0.20.0/querying/query-context.html#vectorization-parameters">'vectorized' query engines</a></p>
+<p>supported features:</p>
+<ul>
+<li>constants and identifiers are supported for any column type</li>
+<li><code>cast</code> is supported for numeric and string types</li>
+<li>math operators: <code>+</code>,<code>-</code>,<code>*</code>,<code>/</code>,<code>%</code>,<code>^</code> are supported for numeric types</li>
+<li>comparison operators: <code>=</code>, <code>!=</code>, <code>&gt;</code>, <code>&gt;=</code>, <code>&lt;</code>, <code>&lt;=</code> are supported for numeric types</li>
+<li>math functions: <code>abs</code>, <code>acos</code>, <code>asin</code>, <code>atan</code>, <code>cbrt</code>, <code>ceil</code>, <code>cos</code>, <code>cosh</code>, <code>cot</code>, <code>exp</code>, <code>expm1</code>, <code>floor</code>, <code>getExponent</code>, <code>log</code>, <code>log10</code>, <code>log1p</code>, <code>nextUp</code>, <code>rint</code>, <code>signum</code>, <code>sin</code>, <code>sinh</code>, <code>sqrt</code>, <code>tan</code>, <code>tanh</code>, <code>toDegrees</code>, <code>toRadians</code>, <code>ulp</code>, <code>atan2</code>, <code>copySign</code>, <code>div</code>, <code>hypot</code>, <code>max</code>, <code>min</code>, <code>nextAfter</code>,  <code>pow</code>, <code>remainder</code>, <code>scalb</code> are supported for numeric types</li>
+<li>time functions: <code>timestamp_floor</code> (with constant granularity argument) is supported for numeric types</li>
+<li>other: <code>parse_long</code> is supported for numeric and string types</li>
+</ul>
+</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/0.20.0/querying/post-aggregations.html"><span class="arrow-prev">← </span><span>Post-aggregations</span></a><a class="docs-next button" href="/docs/0.20.0/querying/having.html"><span class="function-name-prevnext">Having filters (groupBy)</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#general-functions">General functions</a></li><li><a href="#string-functions">String functions</a></li><li><a href="#time-functions">Time functions</a></li><li><a href="#math-functions">Math functions</a></li><li><a href="#array-functions">Array functions</a></li><li><a href="#apply-functions">Apply functions</a></li><li><a href="#reduction-functions">Reduction functions</a></li><li><a href="#ip-address-functions">IP address functions</a></li><li><a href="#vectorization-support">Vectorization Support</a></li></ul></nav></div><footer class="nav-footer druid-footer" id="footer"><div class="container"><div class="text-center"><p><a href="/technology">Technology</a> · <a href="/use-cases">Use Cases</a> · <a href="/druid-powered">Powered by Druid</a> · <a href="/docs/0.20.0/latest">Docs</a> · <a href="/community/">Community</a> · <a href="/downloads.html">Download</a> · <a href="/faq">FAQ</a></p></div><div class="text-center"><a title="Join the user group" href="https://groups.google.com/forum/#!forum/druid-user" target="_blank"><span class="fa fa-comments"></span></a> · <a title="Follow Druid" href="https://twitter.com/druidio" target="_blank"><span class="fab fa-twitter"></span></a> · <a title="Download via Apache" href="https://www.apache.org/dyn/closer.cgi?path=/incubator/druid/{{ site.druid_versions[0].versions[0].version }}/apache-druid-{{ site.druid_versions[0].versions[0].version }}-bin.tar.gz" target="_blank"><span class="fas fa-feather"></span></a> · <a title="GitHub" href="https://github.com/apache/druid" target="_blank"><span class="fab fa-github"></span></a></div><div class="text-center license">Copyright © 2019 <a href="https://www.apache.org/" target="_blank">Apache Software Foundation</a>.<br/>Except where otherwise noted, licensed under <a rel="license" href="http://creativecommons.org/licenses/by-sa/4.0/">CC BY-SA 4.0</a>.<br/>Apache Druid, Druid, and the Druid logo are either registered trademarks or trademarks of The Apache Software Foundation in the United States and other countries.</div></div></footer></div><script type="text/javascript" src="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.js"></script><script>
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+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Papers · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/0.20.0/misc/papers-and-talks.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.20.0" /><meta property="og:title" content="Papers · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
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+  -->
+<h2><a class="anchor" aria-hidden="true" id="papers"></a><a href="#papers" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Papers</h2>
+<ul>
+<li><p><a href="http://static.druid.io/docs/druid.pdf">Druid: A Real-time Analytical Data Store</a> - Discusses the Druid architecture in detail.</p></li>
+<li><p><a href="http://static.druid.io/docs/radstack.pdf">The RADStack: Open Source Lambda Architecture for Interactive Analytics</a> - Discusses how Druid supports real-time and batch workflows.</p></li>
+</ul>
+<h2><a class="anchor" aria-hidden="true" id="presentations"></a><a href="#presentations" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Presentations</h2>
+<ul>
+<li><p><a href="https://www.youtube.com/watch?v=hgmxVPx4vVw">Introduction to Druid</a> - Discusses the motivations behind Druid and the architecture of the system.</p></li>
+<li><p><a href="https://www.youtube.com/watch?v=Dlqj34l2upk">Druid: Interactive Queries Meet Real-Time Data</a> - Discusses how real-time ingestion in Druid works and use cases at Netflix.</p></li>
+<li><p><a href="https://www.youtube.com/watch?v=Hpd3f_MLdXo">Not Exactly! Fast Queries via Approximation Algorithms</a> - Discusses how approximate algorithms work in Druid.</p></li>
+<li><p><a href="https://www.youtube.com/watch?v=kJMYVpnW_AQ">Real-time Analytics with Open Source Technologies</a> - Discusses Lambda architectures with Druid.</p></li>
+<li><p><a href="https://www.youtube.com/watch?v=Sz4w75xRrYM">Stories from the Trenches - The Challenges of Building an Analytics Stack</a> - Discusses features that were added to scale Druid.</p></li>
+<li><p><a href="https://www.youtube.com/watch?v=bZ3LqG3iHbM">Building Interactive Applications at Scale</a> - Discusses building applications on top of Druid.</p></li>
+</ul>
+</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/0.20.0/development/experimental.html"><span class="arrow-prev">← </span><span>Experimental features</span></a><a class="docs-next button" href="/docs/0.20.0/comparisons/druid-vs-elasticsearch.html"><span>Apache Druid vs Elasticsearch</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#papers">Papers</a></li><li><a href="#presentations">Presentations</a></li></ul></nav></div><footer class="nav-footer druid-footer" id="footer"><div class="container"><div class="text-center"><p><a href="/technology">Technology</a> · <a href="/use-cases">Use Cases</a> · <a href="/druid-powered">Powered by Druid</a> · <a href="/docs/0.20.0/latest">Docs</a> · <a href="/community/">Community</a> · <a href="/downloads.html">Download</a> · <a href="/faq">FAQ</a></p></div><div class="text-center"><a title="Join the user group" href="https://groups.google.com/forum/#!forum/druid-user" target="_blank"><span class="fa fa-comments"></span></a> · <a title="Follow Druid" href="https://twitter.com/druidio" target="_blank"><span class="fab fa-twitter"></span></a> · <a title="Download via Apache" href="https://www.apache.org/dyn/closer.cgi?path=/incubator/druid/{{ site.druid_versions[0].versions[0].version }}/apache-druid-{{ site.druid_versions[0].versions[0].version }}-bin.tar.gz" target="_blank"><span class="fas fa-feather"></span></a> · <a title="GitHub" href="https://github.com/apache/druid" target="_blank"><span class="fab fa-github"></span></a></div><div class="text-center license">Copyright © 2019 <a href="https://www.apache.org/" target="_blank">Apache Software Foundation</a>.<br/>Except where otherwise noted, licensed under <a rel="license" href="http://creativecommons.org/licenses/by-sa/4.0/">CC BY-SA 4.0</a>.<br/>Apache Druid, Druid, and the Druid logo are either registered trademarks or trademarks of The Apache Software Foundation in the United States and other countries.</div></div></footer></div><script type="text/javascript" src="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.js"></script><script>
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+<meta charset="utf-8">
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diff --git a/docs/0.20.0/operations/alerts.html b/docs/0.20.0/operations/alerts.html
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+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Alerts · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/0.20.0/operations/alerts.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.20.0" /><meta property="og:title" content="Alerts · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
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+  ~ Licensed to the Apache Software Foundation (ASF) under one
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+<p>Druid generates alerts on getting into unexpected situations.</p>
+<p>Alerts are emitted as JSON objects to a runtime log file or over HTTP (to a service such as Apache Kafka). Alert emission is disabled by default.</p>
+<p>All Druid alerts share a common set of fields:</p>
+<ul>
+<li><code>timestamp</code> - the time the alert was created</li>
+<li><code>service</code> - the service name that emitted the alert</li>
+<li><code>host</code> - the host name that emitted the alert</li>
+<li><code>severity</code> - severity of the alert e.g. anomaly, component-failure, service-failure etc.</li>
+<li><code>description</code> - a description of the alert</li>
+<li><code>data</code> - if there was an exception then a JSON object with fields <code>exceptionType</code>, <code>exceptionMessage</code> and <code>exceptionStackTrace</code></li>
+</ul>
+</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/0.20.0/operations/metrics.html"><span class="arrow-prev">← </span><span>Metrics</span></a><a class="docs-next button" href="/docs/0.20.0/operations/other-hadoop.html"><span>Working with different versions of Apache Hadoop</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"></nav></div><footer class="nav-footer druid-footer" id="footer"><div class="container"><div class="text-center"><p><a href="/technology">Technology</a> · <a href="/use-cases">Use Cases</a> · <a href="/druid-powered">Powered by Druid</a> · <a href="/docs/0.20.0/latest">Docs</a> · <a href="/community/">Community</a> · <a href="/downloads.html">Download</a> · <a href="/faq">FAQ</a></p></div><div class="text-center"><a title="Join the user group" href="https://groups.google.com/forum/#!forum/druid-user" target="_blank"><span class="fa fa-comments"></span></a> · <a title="Follow Druid" href="https://twitter.com/druidio" target="_blank"><span class="fab fa-twitter"></span></a> · <a title="Download via Apache" href="https://www.apache.org/dyn/closer.cgi?path=/incubator/druid/{{ site.druid_versions[0].versions[0].version }}/apache-druid-{{ site.druid_versions[0].versions[0].version }}-bin.tar.gz" target="_blank"><span class="fas fa-feather"></span></a> · <a title="GitHub" href="https://github.com/apache/druid" target="_blank"><span class="fab fa-github"></span></a></div><div class="text-center license">Copyright © 2019 <a href="https://www.apache.org/" target="_blank">Apache Software Foundation</a>.<br/>Except where otherwise noted, licensed under <a rel="license" href="http://creativecommons.org/licenses/by-sa/4.0/">CC BY-SA 4.0</a>.<br/>Apache Druid, Druid, and the Druid logo are either registered trademarks or trademarks of The Apache Software Foundation in the United States and other countries.</div></div></footer></div><script type="text/javascript" src="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.js"></script><script>
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+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>API reference · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/0.20.0/operations/api-reference.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.20.0" /><meta property="og:title" content="API reference · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
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+  ~ or more contributor license agreements.  See the NOTICE file
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+<p>This page documents all of the API endpoints for each Druid service type.</p>
+<h2><a class="anchor" aria-hidden="true" id="common"></a><a href="#common" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Common</h2>
+<p>The following endpoints are supported by all processes.</p>
+<h3><a class="anchor" aria-hidden="true" id="process-information"></a><a href="#process-information" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Process information</h3>
+<h4><a class="anchor" aria-hidden="true" id="get"></a><a href="#get" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>GET</h4>
+<ul>
+<li><code>/status</code></li>
+</ul>
+<p>Returns the Druid version, loaded extensions, memory used, total memory and other useful information about the process.</p>
+<ul>
+<li><code>/status/health</code></li>
+</ul>
+<p>An endpoint that always returns a boolean &quot;true&quot; value with a 200 OK response, useful for automated health checks.</p>
+<ul>
+<li><code>/status/properties</code></li>
+</ul>
+<p>Returns the current configuration properties of the process.</p>
+<ul>
+<li><code>/status/selfDiscovered/status</code></li>
+</ul>
+<p>Returns a JSON map of the form <code>{&quot;selfDiscovered&quot;: true/false}</code>, indicating whether the node has received a confirmation
+from the central node discovery mechanism (currently ZooKeeper) of the Druid cluster that the node has been added to the
+cluster. It is recommended to not consider a Druid node &quot;healthy&quot; or &quot;ready&quot; in automated deployment/container
+management systems until it returns <code>{&quot;selfDiscovered&quot;: true}</code> from this endpoint. This is because a node may be
+isolated from the rest of the cluster due to network issues and it doesn't make sense to consider nodes &quot;healthy&quot; in
+this case. Also, when nodes such as Brokers use ZooKeeper segment discovery for building their view of the Druid cluster
+(as opposed to HTTP segment discovery), they may be unusable until the ZooKeeper client is fully initialized and starts
+to receive data from the ZooKeeper cluster. <code>{&quot;selfDiscovered&quot;: true}</code> is a proxy event indicating that the ZooKeeper
+client on the node has started to receive data from the ZooKeeper cluster and it's expected that all segments and other
+nodes will be discovered by this node timely from this point.</p>
+<ul>
+<li><code>/status/selfDiscovered</code></li>
+</ul>
+<p>Similar to <code>/status/selfDiscovered/status</code>, but returns 200 OK response with empty body if the node has discovered itself
+and 503 SERVICE UNAVAILABLE if the node hasn't discovered itself yet. This endpoint might be useful because some
+monitoring checks such as AWS load balancer health checks are not able to look at the response body.</p>
+<h2><a class="anchor" aria-hidden="true" id="master-server"></a><a href="#master-server" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Master Server</h2>
+<p>This section documents the API endpoints for the processes that reside on Master servers (Coordinators and Overlords)
+in the suggested <a href="../design/processes.html#server-types">three-server configuration</a>.</p>
+<h3><a class="anchor" aria-hidden="true" id="coordinator"></a><a href="#coordinator" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Coordinator</h3>
+<h4><a class="anchor" aria-hidden="true" id="leadership"></a><a href="#leadership" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Leadership</h4>
+<h5><a class="anchor" aria-hidden="true" id="get-1"></a><a href="#get-1" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>GET</h5>
+<ul>
+<li><code>/druid/coordinator/v1/leader</code></li>
+</ul>
+<p>Returns the current leader Coordinator of the cluster.</p>
+<ul>
+<li><code>/druid/coordinator/v1/isLeader</code></li>
+</ul>
+<p>Returns a JSON object with field &quot;leader&quot;, either true or false, indicating if this server is the current leader
+Coordinator of the cluster. In addition, returns HTTP 200 if the server is the current leader and HTTP 404 if not.
+This is suitable for use as a load balancer status check if you only want the active leader to be considered in-service
+at the load balancer.</p>
+<h4><a class="anchor" aria-hidden="true" id="segment-loading"></a><a href="#segment-loading" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Segment Loading</h4>
+<h5><a class="anchor" aria-hidden="true" id="get-2"></a><a href="#get-2" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>GET</h5>
+<ul>
+<li><code>/druid/coordinator/v1/loadstatus</code></li>
+</ul>
+<p>Returns the percentage of segments actually loaded in the cluster versus segments that should be loaded in the cluster.</p>
+<ul>
+<li><code>/druid/coordinator/v1/loadstatus?simple</code></li>
+</ul>
+<p>Returns the number of segments left to load until segments that should be loaded in the cluster are available for queries. This does not include segment replication counts.</p>
+<ul>
+<li><code>/druid/coordinator/v1/loadstatus?full</code></li>
+</ul>
+<p>Returns the number of segments left to load in each tier until segments that should be loaded in the cluster are all available. This includes segment replication counts.</p>
+<ul>
+<li><code>/druid/coordinator/v1/loadqueue</code></li>
+</ul>
+<p>Returns the ids of segments to load and drop for each Historical process.</p>
+<ul>
+<li><code>/druid/coordinator/v1/loadqueue?simple</code></li>
+</ul>
+<p>Returns the number of segments to load and drop, as well as the total segment load and drop size in bytes for each Historical process.</p>
+<ul>
+<li><code>/druid/coordinator/v1/loadqueue?full</code></li>
+</ul>
+<p>Returns the serialized JSON of segments to load and drop for each Historical process.</p>
+<h4><a class="anchor" aria-hidden="true" id="segment-loading-by-datasource"></a><a href="#segment-loading-by-datasource" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Segment Loading by Datasource</h4>
+<p>Note that all <em>interval</em> query parameters are ISO 8601 strings (e.g., 2016-06-27/2016-06-28).
+Also note that these APIs only guarantees that the segments are available at the time of the call.
+Segments can still become missing because of historical process failures or any other reasons afterward.</p>
+<h5><a class="anchor" aria-hidden="true" id="get-3"></a><a href="#get-3" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>GET</h5>
+<ul>
+<li><code>/druid/coordinator/v1/datasources/{dataSourceName}/loadstatus?forceMetadataRefresh={boolean}&amp;interval={myInterval}</code></li>
+</ul>
+<p>Returns the percentage of segments actually loaded in the cluster versus segments that should be loaded in the cluster for the given
+datasource over the given interval (or last 2 weeks if interval is not given). <code>forceMetadataRefresh</code> is required to be set.
+Setting <code>forceMetadataRefresh</code> to true will force the coordinator to poll latest segment metadata from the metadata store
+(Note: <code>forceMetadataRefresh=true</code> refreshes Coordinator's metadata cache of all datasources. This can be a heavy operation in terms
+of the load on the metadata store but can be necessary to make sure that we verify all the latest segments' load status)
+Setting <code>forceMetadataRefresh</code> to false will use the metadata cached on the coordinator from the last force/periodic refresh.
+If no used segments are found for the given inputs, this API returns <code>204 No Content</code></p>
+<ul>
+<li><code>/druid/coordinator/v1/datasources/{dataSourceName}/loadstatus?simple&amp;forceMetadataRefresh={boolean}&amp;interval={myInterval}</code></li>
+</ul>
+<p>Returns the number of segments left to load until segments that should be loaded in the cluster are available for the given datasource
+over the given interval (or last 2 weeks if interval is not given). This does not include segment replication counts. <code>forceMetadataRefresh</code> is required to be set.
+Setting <code>forceMetadataRefresh</code> to true will force the coordinator to poll latest segment metadata from the metadata store
+(Note: <code>forceMetadataRefresh=true</code> refreshes Coordinator's metadata cache of all datasources. This can be a heavy operation in terms
+of the load on the metadata store but can be necessary to make sure that we verify all the latest segments' load status)
+Setting <code>forceMetadataRefresh</code> to false will use the metadata cached on the coordinator from the last force/periodic refresh.
+If no used segments are found for the given inputs, this API returns <code>204 No Content</code></p>
+<ul>
+<li><code>/druid/coordinator/v1/datasources/{dataSourceName}/loadstatus?full&amp;forceMetadataRefresh={boolean}&amp;interval={myInterval}</code></li>
+</ul>
+<p>Returns the number of segments left to load in each tier until segments that should be loaded in the cluster are all available for the given datasource
+over the given interval (or last 2 weeks if interval is not given). This includes segment replication counts. <code>forceMetadataRefresh</code> is required to be set.
+Setting <code>forceMetadataRefresh</code> to true will force the coordinator to poll latest segment metadata from the metadata store
+(Note: <code>forceMetadataRefresh=true</code> refreshes Coordinator's metadata cache of all datasources. This can be a heavy operation in terms
+of the load on the metadata store but can be necessary to make sure that we verify all the latest segments' load status)
+Setting <code>forceMetadataRefresh</code> to false will use the metadata cached on the coordinator from the last force/periodic refresh.
+If no used segments are found for the given inputs, this API returns <code>204 No Content</code></p>
+<h4><a class="anchor" aria-hidden="true" id="metadata-store-information"></a><a href="#metadata-store-information" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Metadata store information</h4>
+<h5><a class="anchor" aria-hidden="true" id="get-4"></a><a href="#get-4" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>GET</h5>
+<ul>
+<li><code>/druid/coordinator/v1/metadata/datasources</code></li>
+</ul>
+<p>Returns a list of the names of data sources with at least one used segment in the cluster.</p>
+<ul>
+<li><code>/druid/coordinator/v1/metadata/datasources?includeUnused</code></li>
+</ul>
+<p>Returns a list of the names of data sources, regardless of whether there are used segments belonging to those data
+sources in the cluster or not.</p>
+<ul>
+<li><code>/druid/coordinator/v1/metadata/datasources?full</code></li>
+</ul>
+<p>Returns a list of all data sources with at least one used segment in the cluster. Returns all metadata about those data
+sources as stored in the metadata store.</p>
+<ul>
+<li><code>/druid/coordinator/v1/metadata/datasources/{dataSourceName}</code></li>
+</ul>
+<p>Returns full metadata for a datasource as stored in the metadata store.</p>
+<ul>
+<li><code>/druid/coordinator/v1/metadata/datasources/{dataSourceName}/segments</code></li>
+</ul>
+<p>Returns a list of all segments for a datasource as stored in the metadata store.</p>
+<ul>
+<li><code>/druid/coordinator/v1/metadata/datasources/{dataSourceName}/segments?full</code></li>
+</ul>
+<p>Returns a list of all segments for a datasource with the full segment metadata as stored in the metadata store.</p>
+<ul>
+<li><code>/druid/coordinator/v1/metadata/datasources/{dataSourceName}/segments/{segmentId}</code></li>
+</ul>
+<p>Returns full segment metadata for a specific segment as stored in the metadata store, if the segment is used. If the
+segment is unused, or is unknown, a 404 response is returned.</p>
+<h5><a class="anchor" aria-hidden="true" id="post"></a><a href="#post" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>POST</h5>
+<ul>
+<li><code>/druid/coordinator/v1/metadata/datasources/{dataSourceName}/segments</code></li>
+</ul>
+<p>Returns a list of all segments, overlapping with any of given intervals,  for a datasource as stored in the metadata store. Request body is array of string IS0 8601 intervals like [interval1, interval2,...] for example [&quot;2012-01-01T00:00:00.000/2012-01-03T00:00:00.000&quot;, &quot;2012-01-05T00:00:00.000/2012-01-07T00:00:00.000&quot;]</p>
+<ul>
+<li><code>/druid/coordinator/v1/metadata/datasources/{dataSourceName}/segments?full</code></li>
+</ul>
+<p>Returns a list of all segments, overlapping with any of given intervals, for a datasource with the full segment metadata as stored in the metadata store. Request body is array of string ISO 8601 intervals like [interval1, interval2,...] for example [&quot;2012-01-01T00:00:00.000/2012-01-03T00:00:00.000&quot;, &quot;2012-01-05T00:00:00.000/2012-01-07T00:00:00.000&quot;]</p>
+<p><a name="coordinator-datasources"></a></p>
+<h4><a class="anchor" aria-hidden="true" id="datasources"></a><a href="#datasources" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Datasources</h4>
+<p>Note that all <em>interval</em> URL parameters are ISO 8601 strings delimited by a <code>_</code> instead of a <code>/</code>
+(e.g., 2016-06-27_2016-06-28).</p>
+<h5><a class="anchor" aria-hidden="true" id="get-5"></a><a href="#get-5" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>GET</h5>
+<ul>
+<li><code>/druid/coordinator/v1/datasources</code></li>
+</ul>
+<p>Returns a list of datasource names found in the cluster.</p>
+<ul>
+<li><code>/druid/coordinator/v1/datasources?simple</code></li>
+</ul>
+<p>Returns a list of JSON objects containing the name and properties of datasources found in the cluster.  Properties include segment count, total segment byte size, replicated total segment byte size, minTime, and maxTime.</p>
+<ul>
+<li><code>/druid/coordinator/v1/datasources?full</code></li>
+</ul>
+<p>Returns a list of datasource names found in the cluster with all metadata about those datasources.</p>
+<ul>
+<li><code>/druid/coordinator/v1/datasources/{dataSourceName}</code></li>
+</ul>
+<p>Returns a JSON object containing the name and properties of a datasource. Properties include segment count, total segment byte size, replicated total segment byte size, minTime, and maxTime.</p>
+<ul>
+<li><code>/druid/coordinator/v1/datasources/{dataSourceName}?full</code></li>
+</ul>
+<p>Returns full metadata for a datasource .</p>
+<ul>
+<li><code>/druid/coordinator/v1/datasources/{dataSourceName}/intervals</code></li>
+</ul>
+<p>Returns a set of segment intervals.</p>
+<ul>
+<li><code>/druid/coordinator/v1/datasources/{dataSourceName}/intervals?simple</code></li>
+</ul>
+<p>Returns a map of an interval to a JSON object containing the total byte size of segments and number of segments for that interval.</p>
+<ul>
+<li><code>/druid/coordinator/v1/datasources/{dataSourceName}/intervals?full</code></li>
+</ul>
+<p>Returns a map of an interval to a map of segment metadata to a set of server names that contain the segment for that interval.</p>
+<ul>
+<li><code>/druid/coordinator/v1/datasources/{dataSourceName}/intervals/{interval}</code></li>
+</ul>
+<p>Returns a set of segment ids for an interval.</p>
+<ul>
+<li><code>/druid/coordinator/v1/datasources/{dataSourceName}/intervals/{interval}?simple</code></li>
+</ul>
+<p>Returns a map of segment intervals contained within the specified interval to a JSON object containing the total byte size of segments and number of segments for an interval.</p>
+<ul>
+<li><code>/druid/coordinator/v1/datasources/{dataSourceName}/intervals/{interval}?full</code></li>
+</ul>
+<p>Returns a map of segment intervals contained within the specified interval to a map of segment metadata to a set of server names that contain the segment for an interval.</p>
+<ul>
+<li><code>/druid/coordinator/v1/datasources/{dataSourceName}/intervals/{interval}/serverview</code></li>
+</ul>
+<p>Returns a map of segment intervals contained within the specified interval to information about the servers that contain the segment for an interval.</p>
+<ul>
+<li><code>/druid/coordinator/v1/datasources/{dataSourceName}/segments</code></li>
+</ul>
+<p>Returns a list of all segments for a datasource in the cluster.</p>
+<ul>
+<li><code>/druid/coordinator/v1/datasources/{dataSourceName}/segments?full</code></li>
+</ul>
+<p>Returns a list of all segments for a datasource in the cluster with the full segment metadata.</p>
+<ul>
+<li><code>/druid/coordinator/v1/datasources/{dataSourceName}/segments/{segmentId}</code></li>
+</ul>
+<p>Returns full segment metadata for a specific segment in the cluster.</p>
+<ul>
+<li><code>/druid/coordinator/v1/datasources/{dataSourceName}/tiers</code></li>
+</ul>
+<p>Return the tiers that a datasource exists in.</p>
+<h4><a class="anchor" aria-hidden="true" id="note-for-coordinators-post-and-delete-apis"></a><a href="#note-for-coordinators-post-and-delete-apis" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Note for coordinator's POST and DELETE API's</h4>
+<p>The segments would be enabled when these API's are called, but then can be disabled again by the coordinator if any dropRule matches. Segments enabled by these API's might not be loaded by historical processes if no loadRule matches.  If an indexing or kill task runs at the same time as these API's are invoked, the behavior is undefined. Some segments might be killed and others might be enabled. It's also possible that all segments might be disabled but at the same time, the indexing task is able to read data from those segments and succeed.</p>
+<p>Caution : Avoid using indexing or kill tasks and these API's at the same time for the same datasource and time chunk. (It's fine if the time chunks or datasource don't overlap)</p>
+<h5><a class="anchor" aria-hidden="true" id="post-1"></a><a href="#post-1" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>POST</h5>
+<ul>
+<li><code>/druid/coordinator/v1/datasources/{dataSourceName}</code></li>
+</ul>
+<p>Marks as used all segments belonging to a data source. Returns a JSON object of the form
+<code>{&quot;numChangedSegments&quot;: &lt;number&gt;}</code> with the number of segments in the database whose state has been changed (that is,
+the segments were marked as used) as the result of this API call.</p>
+<ul>
+<li><code>/druid/coordinator/v1/datasources/{dataSourceName}/segments/{segmentId}</code></li>
+</ul>
+<p>Marks as used a segment of a data source. Returns a JSON object of the form <code>{&quot;segmentStateChanged&quot;: &lt;boolean&gt;}</code> with
+the boolean indicating if the state of the segment has been changed (that is, the segment was marked as used) as the
+result of this API call.</p>
+<ul>
+<li><p><code>/druid/coordinator/v1/datasources/{dataSourceName}/markUsed</code></p></li>
+<li><p><code>/druid/coordinator/v1/datasources/{dataSourceName}/markUnused</code></p></li>
+</ul>
+<p>Marks segments (un)used for a datasource by interval or set of segment Ids.</p>
+<p>When marking used only segments that are not overshadowed will be updated.</p>
+<p>The request payload contains the interval or set of segment Ids to be marked unused.
+Either interval or segment ids should be provided, if both or none are provided in the payload, the API would throw an error (400 BAD REQUEST).</p>
+<p>Interval specifies the start and end times as IS0 8601 strings. <code>interval=(start/end)</code> where start and end both are inclusive and only the segments completely contained within the specified interval will be disabled, partially overlapping segments will not be affected.</p>
+<p>JSON Request Payload:</p>
+<table>
+<thead>
+<tr><th>Key</th><th>Description</th><th>Example</th></tr>
+</thead>
+<tbody>
+<tr><td><code>interval</code></td><td>The interval for which to mark segments unused</td><td>&quot;2015-09-12T03:00:00.000Z/2015-09-12T05:00:00.000Z&quot;</td></tr>
+<tr><td><code>segmentIds</code></td><td>Set of segment Ids to be marked unused</td><td>[&quot;segmentId1&quot;, &quot;segmentId2&quot;]</td></tr>
+</tbody>
+</table>
+<h5><a class="anchor" aria-hidden="true" id="delete"></a><a href="#delete" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>DELETE</h5>
+<ul>
+<li><code>/druid/coordinator/v1/datasources/{dataSourceName}</code></li>
+</ul>
+<p>Marks as unused all segments belonging to a data source. Returns a JSON object of the form
+<code>{&quot;numChangedSegments&quot;: &lt;number&gt;}</code> with the number of segments in the database whose state has been changed (that is,
+the segments were marked as unused) as the result of this API call.</p>
+<ul>
+<li><code>/druid/coordinator/v1/datasources/{dataSourceName}/intervals/{interval}</code></li>
+<li><code>@Deprecated. /druid/coordinator/v1/datasources/{dataSourceName}?kill=true&amp;interval={myInterval}</code></li>
+</ul>
+<p>Runs a <a href="/docs/0.20.0/ingestion/tasks.html">Kill task</a> for a given interval and datasource.</p>
+<ul>
+<li><code>/druid/coordinator/v1/datasources/{dataSourceName}/segments/{segmentId}</code></li>
+</ul>
+<p>Marks as unused a segment of a data source. Returns a JSON object of the form <code>{&quot;segmentStateChanged&quot;: &lt;boolean&gt;}</code> with
+the boolean indicating if the state of the segment has been changed (that is, the segment was marked as unused) as the
+result of this API call.</p>
+<h4><a class="anchor" aria-hidden="true" id="retention-rules"></a><a href="#retention-rules" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Retention Rules</h4>
+<p>Note that all <em>interval</em> URL parameters are ISO 8601 strings delimited by a <code>_</code> instead of a <code>/</code>
+(e.g., 2016-06-27_2016-06-28).</p>
+<h5><a class="anchor" aria-hidden="true" id="get-6"></a><a href="#get-6" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>GET</h5>
+<ul>
+<li><code>/druid/coordinator/v1/rules</code></li>
+</ul>
+<p>Returns all rules as JSON objects for all datasources in the cluster including the default datasource.</p>
+<ul>
+<li><code>/druid/coordinator/v1/rules/{dataSourceName}</code></li>
+</ul>
+<p>Returns all rules for a specified datasource.</p>
+<ul>
+<li><code>/druid/coordinator/v1/rules/{dataSourceName}?full</code></li>
+</ul>
+<p>Returns all rules for a specified datasource and includes default datasource.</p>
+<ul>
+<li><code>/druid/coordinator/v1/rules/history?interval=&lt;interval&gt;</code></li>
+</ul>
+<p>Returns audit history of rules for all datasources. default value of interval can be specified by setting <code>druid.audit.manager.auditHistoryMillis</code> (1 week if not configured) in Coordinator runtime.properties</p>
+<ul>
+<li><code>/druid/coordinator/v1/rules/history?count=&lt;n&gt;</code></li>
+</ul>
+<p>Returns last <n> entries of audit history of rules for all datasources.</p>
+<ul>
+<li><code>/druid/coordinator/v1/rules/{dataSourceName}/history?interval=&lt;interval&gt;</code></li>
+</ul>
+<p>Returns audit history of rules for a specified datasource. default value of interval can be specified by setting <code>druid.audit.manager.auditHistoryMillis</code> (1 week if not configured) in Coordinator runtime.properties</p>
+<ul>
+<li><code>/druid/coordinator/v1/rules/{dataSourceName}/history?count=&lt;n&gt;</code></li>
+</ul>
+<p>Returns last <n> entries of audit history of rules for a specified datasource.</p>
+<h5><a class="anchor" aria-hidden="true" id="post-2"></a><a href="#post-2" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>POST</h5>
+<ul>
+<li><code>/druid/coordinator/v1/rules/{dataSourceName}</code></li>
+</ul>
+<p>POST with a list of rules in JSON form to update rules.</p>
+<p>Optional Header Parameters for auditing the config change can also be specified.</p>
+<table>
+<thead>
+<tr><th>Header Param Name</th><th>Description</th><th>Default</th></tr>
+</thead>
+<tbody>
+<tr><td><code>X-Druid-Author</code></td><td>author making the config change</td><td>&quot;&quot;</td></tr>
+<tr><td><code>X-Druid-Comment</code></td><td>comment describing the change being done</td><td>&quot;&quot;</td></tr>
+</tbody>
+</table>
+<h4><a class="anchor" aria-hidden="true" id="intervals"></a><a href="#intervals" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Intervals</h4>
+<p>Note that all <em>interval</em> URL parameters are ISO 8601 strings delimited by a <code>_</code> instead of a <code>/</code>
+(e.g., 2016-06-27_2016-06-28).</p>
+<h5><a class="anchor" aria-hidden="true" id="get-7"></a><a href="#get-7" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>GET</h5>
+<ul>
+<li><code>/druid/coordinator/v1/intervals</code></li>
+</ul>
+<p>Returns all intervals for all datasources with total size and count.</p>
+<ul>
+<li><code>/druid/coordinator/v1/intervals/{interval}</code></li>
+</ul>
+<p>Returns aggregated total size and count for all intervals that intersect given isointerval.</p>
+<ul>
+<li><code>/druid/coordinator/v1/intervals/{interval}?simple</code></li>
+</ul>
+<p>Returns total size and count for each interval within given isointerval.</p>
+<ul>
+<li><code>/druid/coordinator/v1/intervals/{interval}?full</code></li>
+</ul>
+<p>Returns total size and count for each datasource for each interval within given isointerval.</p>
+<h4><a class="anchor" aria-hidden="true" id="compaction-status"></a><a href="#compaction-status" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Compaction Status</h4>
+<h5><a class="anchor" aria-hidden="true" id="get-8"></a><a href="#get-8" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>GET</h5>
+<ul>
+<li><code>/druid/coordinator/v1/compaction/progress?dataSource={dataSource}</code></li>
+</ul>
+<p>Returns the total size of segments awaiting compaction for the given dataSource.
+This is only valid for dataSource which has compaction enabled.</p>
+<h4><a class="anchor" aria-hidden="true" id="compaction-configuration"></a><a href="#compaction-configuration" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Compaction Configuration</h4>
+<h5><a class="anchor" aria-hidden="true" id="get-9"></a><a href="#get-9" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>GET</h5>
+<ul>
+<li><code>/druid/coordinator/v1/config/compaction</code></li>
+</ul>
+<p>Returns all compaction configs.</p>
+<ul>
+<li><code>/druid/coordinator/v1/config/compaction/{dataSource}</code></li>
+</ul>
+<p>Returns a compaction config of a dataSource.</p>
+<h5><a class="anchor" aria-hidden="true" id="post-3"></a><a href="#post-3" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>POST</h5>
+<ul>
+<li><code>/druid/coordinator/v1/config/compaction/taskslots?ratio={someRatio}&amp;max={someMaxSlots}</code></li>
+</ul>
+<p>Update the capacity for compaction tasks. <code>ratio</code> and <code>max</code> are used to limit the max number of compaction tasks.
+They mean the ratio of the total task slots to the compaction task slots and the maximum number of task slots for compaction tasks, respectively.
+The actual max number of compaction tasks is <code>min(max, ratio * total task slots)</code>.
+Note that <code>ratio</code> and <code>max</code> are optional and can be omitted. If they are omitted, default values (0.1 and unbounded)
+will be set for them.</p>
+<ul>
+<li><code>/druid/coordinator/v1/config/compaction</code></li>
+</ul>
+<p>Creates or updates the compaction config for a dataSource.
+See <a href="../configuration/index.html#compaction-dynamic-configuration">Compaction Configuration</a> for configuration details.</p>
+<h5><a class="anchor" aria-hidden="true" id="delete-1"></a><a href="#delete-1" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>DELETE</h5>
+<ul>
+<li><code>/druid/coordinator/v1/config/compaction/{dataSource}</code></li>
+</ul>
+<p>Removes the compaction config for a dataSource.</p>
+<h4><a class="anchor" aria-hidden="true" id="server-information"></a><a href="#server-information" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Server information</h4>
+<h5><a class="anchor" aria-hidden="true" id="get-10"></a><a href="#get-10" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>GET</h5>
+<ul>
+<li><code>/druid/coordinator/v1/servers</code></li>
+</ul>
+<p>Returns a list of servers URLs using the format <code>{hostname}:{port}</code>. Note that
+processes that run with different types will appear multiple times with different
+ports.</p>
+<ul>
+<li><code>/druid/coordinator/v1/servers?simple</code></li>
+</ul>
+<p>Returns a list of server data objects in which each object has the following keys:</p>
+<ul>
+<li><code>host</code>: host URL include (<code>{hostname}:{port}</code>)</li>
+<li><code>type</code>: process type (<code>indexer-executor</code>, <code>historical</code>)</li>
+<li><code>currSize</code>: storage size currently used</li>
+<li><code>maxSize</code>: maximum storage size</li>
+<li><code>priority</code></li>
+<li><code>tier</code></li>
+</ul>
+<h3><a class="anchor" aria-hidden="true" id="overlord"></a><a href="#overlord" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Overlord</h3>
+<h4><a class="anchor" aria-hidden="true" id="leadership-1"></a><a href="#leadership-1" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Leadership</h4>
+<h5><a class="anchor" aria-hidden="true" id="get-11"></a><a href="#get-11" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>GET</h5>
+<ul>
+<li><code>/druid/indexer/v1/leader</code></li>
+</ul>
+<p>Returns the current leader Overlord of the cluster. If you have multiple Overlords, just one is leading at any given time. The others are on standby.</p>
+<ul>
+<li><code>/druid/indexer/v1/isLeader</code></li>
+</ul>
+<p>This returns a JSON object with field &quot;leader&quot;, either true or false. In addition, this call returns HTTP 200 if the
+server is the current leader and HTTP 404 if not. This is suitable for use as a load balancer status check if you
+only want the active leader to be considered in-service at the load balancer.</p>
+<h4><a class="anchor" aria-hidden="true" id="tasks"></a><a href="#tasks" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Tasks</h4>
+<p>Note that all <em>interval</em> URL parameters are ISO 8601 strings delimited by a <code>_</code> instead of a <code>/</code>
+(e.g., 2016-06-27_2016-06-28).</p>
+<h5><a class="anchor" aria-hidden="true" id="get-12"></a><a href="#get-12" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>GET</h5>
+<ul>
+<li><code>/druid/indexer/v1/tasks</code></li>
+</ul>
+<p>Retrieve list of tasks. Accepts query string parameters <code>state</code>, <code>datasource</code>, <code>createdTimeInterval</code>, <code>max</code>, and <code>type</code>.</p>
+<table>
+<thead>
+<tr><th>Query Parameter</th><th>Description</th></tr>
+</thead>
+<tbody>
+<tr><td><code>state</code></td><td>filter list of tasks by task state, valid options are <code>running</code>, <code>complete</code>, <code>waiting</code>, and <code>pending</code>.</td></tr>
+<tr><td><code>datasource</code></td><td>return tasks filtered by Druid datasource.</td></tr>
+<tr><td><code>createdTimeInterval</code></td><td>return tasks created within the specified interval.</td></tr>
+<tr><td><code>max</code></td><td>maximum number of <code>&quot;complete&quot;</code> tasks to return. Only applies when <code>state</code> is set to <code>&quot;complete&quot;</code>.</td></tr>
+<tr><td><code>type</code></td><td>filter tasks by task type. See <a href="/docs/0.20.0/ingestion/tasks.html">task documentation</a> for more details.</td></tr>
+</tbody>
+</table>
+<ul>
+<li><code>/druid/indexer/v1/completeTasks</code></li>
+</ul>
+<p>Retrieve list of complete tasks. Equivalent to <code>/druid/indexer/v1/tasks?state=complete</code>.</p>
+<ul>
+<li><code>/druid/indexer/v1/runningTasks</code></li>
+</ul>
+<p>Retrieve list of running tasks. Equivalent to <code>/druid/indexer/v1/tasks?state=running</code>.</p>
+<ul>
+<li><code>/druid/indexer/v1/waitingTasks</code></li>
+</ul>
+<p>Retrieve list of waiting tasks. Equivalent to <code>/druid/indexer/v1/tasks?state=waiting</code>.</p>
+<ul>
+<li><code>/druid/indexer/v1/pendingTasks</code></li>
+</ul>
+<p>Retrieve list of pending tasks. Equivalent to <code>/druid/indexer/v1/tasks?state=pending</code>.</p>
+<ul>
+<li><code>/druid/indexer/v1/task/{taskId}</code></li>
+</ul>
+<p>Retrieve the 'payload' of a task.</p>
+<ul>
+<li><code>/druid/indexer/v1/task/{taskId}/status</code></li>
+</ul>
+<p>Retrieve the status of a task.</p>
+<ul>
+<li><code>/druid/indexer/v1/task/{taskId}/segments</code></li>
+</ul>
+<p>Retrieve information about the segments of a task.</p>
+<blockquote>
+<p>This API is deprecated and will be removed in future releases.</p>
+</blockquote>
+<ul>
+<li><code>/druid/indexer/v1/task/{taskId}/reports</code></li>
+</ul>
+<p>Retrieve a <a href="/docs/0.20.0/ingestion/tasks.html#task-reports">task completion report</a> for a task. Only works for completed tasks.</p>
+<h5><a class="anchor" aria-hidden="true" id="post-4"></a><a href="#post-4" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>POST</h5>
+<ul>
+<li><code>/druid/indexer/v1/task</code></li>
+</ul>
+<p>Endpoint for submitting tasks and supervisor specs to the Overlord. Returns the taskId of the submitted task.</p>
+<ul>
+<li><code>/druid/indexer/v1/task/{taskId}/shutdown</code></li>
+</ul>
+<p>Shuts down a task.</p>
+<ul>
+<li><code>/druid/indexer/v1/datasources/{dataSource}/shutdownAllTasks</code></li>
+</ul>
+<p>Shuts down all tasks for a dataSource.</p>
+<ul>
+<li><code>/druid/indexer/v1/taskStatus</code></li>
+</ul>
+<p>Retrieve list of task status objects for list of task id strings in request body.</p>
+<h5><a class="anchor" aria-hidden="true" id="delete-2"></a><a href="#delete-2" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>DELETE</h5>
+<ul>
+<li><code>/druid/indexer/v1/pendingSegments/{dataSource}</code></li>
+</ul>
+<p>Manually clean up pending segments table in metadata storage for <code>datasource</code>. Returns a JSON object response with
+<code>numDeleted</code> and count of rows deleted from the pending segments table. This API is used by the
+<code>druid.coordinator.kill.pendingSegments.on</code> <a href="../configuration/index.html#coordinator-operation">coordinator setting</a>
+which automates this operation to perform periodically.</p>
+<h4><a class="anchor" aria-hidden="true" id="supervisors"></a><a href="#supervisors" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Supervisors</h4>
+<h5><a class="anchor" aria-hidden="true" id="get-13"></a><a href="#get-13" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>GET</h5>
+<ul>
+<li><code>/druid/indexer/v1/supervisor</code></li>
+</ul>
+<p>Returns a list of strings of the currently active supervisor ids.</p>
+<ul>
+<li><code>/druid/indexer/v1/supervisor?full</code></li>
+</ul>
+<p>Returns a list of objects of the currently active supervisors.</p>
+<table>
+<thead>
+<tr><th>Field</th><th>Type</th><th>Description</th></tr>
+</thead>
+<tbody>
+<tr><td><code>id</code></td><td>String</td><td>supervisor unique identifier</td></tr>
+<tr><td><code>state</code></td><td>String</td><td>basic state of the supervisor. Available states:<code>UNHEALTHY_SUPERVISOR</code>, <code>UNHEALTHY_TASKS</code>, <code>PENDING</code>, <code>RUNNING</code>, <code>SUSPENDED</code>, <code>STOPPING</code>. Check <a href="../development/extensions-core/kafka-ingestion.html#operations">Kafka Docs</a> for details.</td></tr>
+<tr><td><code>detailedState</code></td><td>String</td><td>supervisor specific state. (See documentation of specific supervisor for details), e.g. <a href="../development/extensions-core/kafka-ingestion.html">Kafka</a> or <a href="../development/extensions-core/kinesis-ingestion.html">Kinesis</a>)</td></tr>
+<tr><td><code>healthy</code></td><td>Boolean</td><td>true or false indicator of overall supervisor health</td></tr>
+<tr><td><code>spec</code></td><td>SupervisorSpec</td><td>json specification of supervisor (See Supervisor Configuration for details)</td></tr>
+</tbody>
+</table>
+<ul>
+<li><code>/druid/indexer/v1/supervisor?state=true</code></li>
+</ul>
+<p>Returns a list of objects of the currently active supervisors and their current state.</p>
+<table>
+<thead>
+<tr><th>Field</th><th>Type</th><th>Description</th></tr>
+</thead>
+<tbody>
+<tr><td><code>id</code></td><td>String</td><td>supervisor unique identifier</td></tr>
+<tr><td><code>state</code></td><td>String</td><td>basic state of the supervisor. Available states: <code>UNHEALTHY_SUPERVISOR</code>, <code>UNHEALTHY_TASKS</code>, <code>PENDING</code>, <code>RUNNING</code>, <code>SUSPENDED</code>, <code>STOPPING</code>. Check <a href="../development/extensions-core/kafka-ingestion.html#operations">Kafka Docs</a> for details.</td></tr>
+<tr><td><code>detailedState</code></td><td>String</td><td>supervisor specific state. (See documentation of the specific supervisor for details, e.g. <a href="../development/extensions-core/kafka-ingestion.html">Kafka</a> or <a href="../development/extensions-core/kinesis-ingestion.html">Kinesis</a>)</td></tr>
+<tr><td><code>healthy</code></td><td>Boolean</td><td>true or false indicator of overall supervisor health</td></tr>
+<tr><td><code>suspended</code></td><td>Boolean</td><td>true or false indicator of whether the supervisor is in suspended state</td></tr>
+</tbody>
+</table>
+<ul>
+<li><code>/druid/indexer/v1/supervisor/&lt;supervisorId&gt;</code></li>
+</ul>
+<p>Returns the current spec for the supervisor with the provided ID.</p>
+<ul>
+<li><code>/druid/indexer/v1/supervisor/&lt;supervisorId&gt;/status</code></li>
+</ul>
+<p>Returns the current status of the supervisor with the provided ID.</p>
+<ul>
+<li><code>/druid/indexer/v1/supervisor/history</code></li>
+</ul>
+<p>Returns an audit history of specs for all supervisors (current and past).</p>
+<ul>
+<li><code>/druid/indexer/v1/supervisor/&lt;supervisorId&gt;/history</code></li>
+</ul>
+<p>Returns an audit history of specs for the supervisor with the provided ID.</p>
+<h5><a class="anchor" aria-hidden="true" id="post-5"></a><a href="#post-5" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>POST</h5>
+<ul>
+<li><code>/druid/indexer/v1/supervisor</code></li>
+</ul>
+<p>Create a new supervisor or update an existing one.</p>
+<ul>
+<li><code>/druid/indexer/v1/supervisor/&lt;supervisorId&gt;/suspend</code></li>
+</ul>
+<p>Suspend the current running supervisor of the provided ID. Responds with updated SupervisorSpec.</p>
+<ul>
+<li><code>/druid/indexer/v1/supervisor/suspendAll</code></li>
+</ul>
+<p>Suspend all supervisors at once.</p>
+<ul>
+<li><code>/druid/indexer/v1/supervisor/&lt;supervisorId&gt;/resume</code></li>
+</ul>
+<p>Resume indexing tasks for a supervisor. Responds with updated SupervisorSpec.</p>
+<ul>
+<li><code>/druid/indexer/v1/supervisor/resumeAll</code></li>
+</ul>
+<p>Resume all supervisors at once.</p>
+<ul>
+<li><code>/druid/indexer/v1/supervisor/&lt;supervisorId&gt;/reset</code></li>
+</ul>
+<p>Reset the specified supervisor.</p>
+<ul>
+<li><code>/druid/indexer/v1/supervisor/&lt;supervisorId&gt;/terminate</code></li>
+</ul>
+<p>Terminate a supervisor of the provided ID.</p>
+<ul>
+<li><code>/druid/indexer/v1/supervisor/terminateAll</code></li>
+</ul>
+<p>Terminate all supervisors at once.</p>
+<ul>
+<li><code>/druid/indexer/v1/supervisor/&lt;supervisorId&gt;/shutdown</code></li>
+</ul>
+<p>Shutdown a supervisor.</p>
+<blockquote>
+<p>This API is deprecated and will be removed in future releases.
+Please use the equivalent 'terminate' instead.</p>
+</blockquote>
+<h4><a class="anchor" aria-hidden="true" id="dynamic-configuration"></a><a href="#dynamic-configuration" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Dynamic configuration</h4>
+<p>See <a href="../configuration/index.html#overlord-dynamic-configuration">Overlord Dynamic Configuration</a> for details.</p>
+<p>Note that all <em>interval</em> URL parameters are ISO 8601 strings delimited by a <code>_</code> instead of a <code>/</code>
+(e.g., 2016-06-27_2016-06-28).</p>
+<h5><a class="anchor" aria-hidden="true" id="get-14"></a><a href="#get-14" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>GET</h5>
+<ul>
+<li><code>/druid/indexer/v1/worker</code></li>
+</ul>
+<p>Retrieves current overlord dynamic configuration.</p>
+<ul>
+<li><code>/druid/indexer/v1/worker/history?interval={interval}&amp;counter={count}</code></li>
+</ul>
+<p>Retrieves history of changes to overlord dynamic configuration. Accepts <code>interval</code> and  <code>count</code> query string parameters
+to filter by interval and limit the number of results respectively.</p>
+<ul>
+<li><code>/druid/indexer/v1/scaling</code></li>
+</ul>
+<p>Retrieves overlord scaling events if auto-scaling runners are in use.</p>
+<h5><a class="anchor" aria-hidden="true" id="post-6"></a><a href="#post-6" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>POST</h5>
+<ul>
+<li>/druid/indexer/v1/worker</li>
+</ul>
+<p>Update overlord dynamic worker configuration.</p>
+<h2><a class="anchor" aria-hidden="true" id="data-server"></a><a href="#data-server" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Data Server</h2>
+<p>This section documents the API endpoints for the processes that reside on Data servers (MiddleManagers/Peons and Historicals)
+in the suggested <a href="../design/processes.html#server-types">three-server configuration</a>.</p>
+<h3><a class="anchor" aria-hidden="true" id="middlemanager"></a><a href="#middlemanager" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>MiddleManager</h3>
+<h5><a class="anchor" aria-hidden="true" id="get-15"></a><a href="#get-15" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>GET</h5>
+<ul>
+<li><code>/druid/worker/v1/enabled</code></li>
+</ul>
+<p>Check whether a MiddleManager is in an enabled or disabled state. Returns JSON object keyed by the combined <code>druid.host</code>
+and <code>druid.port</code> with the boolean state as the value.</p>
+<pre><code class="hljs css language-json">{<span class="hljs-attr">"localhost:8091"</span>:<span class="hljs-literal">true</span>}
+</code></pre>
+<ul>
+<li><code>/druid/worker/v1/tasks</code></li>
+</ul>
+<p>Retrieve a list of active tasks being run on MiddleManager. Returns JSON list of taskid strings.  Normal usage should
+prefer to use the <code>/druid/indexer/v1/tasks</code> <a href="#overlord">Overlord API</a> or one of it's task state specific variants instead.</p>
+<pre><code class="hljs css language-json">[<span class="hljs-string">"index_wikiticker_2019-02-11T02:20:15.316Z"</span>]
+</code></pre>
+<ul>
+<li><code>/druid/worker/v1/task/{taskid}/log</code></li>
+</ul>
+<p>Retrieve task log output stream by task id. Normal usage should prefer to use the <code>/druid/indexer/v1/task/{taskId}/log</code>
+<a href="#overlord">Overlord API</a> instead.</p>
+<h5><a class="anchor" aria-hidden="true" id="post-7"></a><a href="#post-7" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>POST</h5>
+<ul>
+<li><code>/druid/worker/v1/disable</code></li>
+</ul>
+<p>'Disable' a MiddleManager, causing it to stop accepting new tasks but complete all existing tasks. Returns JSON  object
+keyed by the combined <code>druid.host</code> and <code>druid.port</code>:</p>
+<pre><code class="hljs css language-json">{<span class="hljs-attr">"localhost:8091"</span>:<span class="hljs-string">"disabled"</span>}
+</code></pre>
+<ul>
+<li><code>/druid/worker/v1/enable</code></li>
+</ul>
+<p>'Enable' a MiddleManager, allowing it to accept new tasks again if it was previously disabled. Returns JSON  object
+keyed by the combined <code>druid.host</code> and <code>druid.port</code>:</p>
+<pre><code class="hljs css language-json">{<span class="hljs-attr">"localhost:8091"</span>:<span class="hljs-string">"enabled"</span>}
+</code></pre>
+<ul>
+<li><code>/druid/worker/v1/task/{taskid}/shutdown</code></li>
+</ul>
+<p>Shutdown a running task by <code>taskid</code>. Normal usage should prefer to use the <code>/druid/indexer/v1/task/{taskId}/shutdown</code>
+<a href="#overlord">Overlord API</a> instead. Returns JSON:</p>
+<pre><code class="hljs css language-json">{<span class="hljs-attr">"task"</span>:<span class="hljs-string">"index_kafka_wikiticker_f7011f8ffba384b_fpeclode"</span>}
+</code></pre>
+<h3><a class="anchor" aria-hidden="true" id="peon"></a><a href="#peon" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Peon</h3>
+<h4><a class="anchor" aria-hidden="true" id="get-16"></a><a href="#get-16" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>GET</h4>
+<ul>
+<li><code>/druid/worker/v1/chat/{taskId}/rowStats</code></li>
+</ul>
+<p>Retrieve a live row stats report from a Peon. See <a href="/docs/0.20.0/ingestion/tasks.html#task-reports">task reports</a> for more details.</p>
+<ul>
+<li><code>/druid/worker/v1/chat/{taskId}/unparseableEvents</code></li>
+</ul>
+<p>Retrieve an unparseable events report from a Peon. See <a href="/docs/0.20.0/ingestion/tasks.html#task-reports">task reports</a> for more details.</p>
+<h3><a class="anchor" aria-hidden="true" id="historical"></a><a href="#historical" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Historical</h3>
+<h4><a class="anchor" aria-hidden="true" id="segment-loading-1"></a><a href="#segment-loading-1" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Segment Loading</h4>
+<h5><a class="anchor" aria-hidden="true" id="get-17"></a><a href="#get-17" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>GET</h5>
+<ul>
+<li><code>/druid/historical/v1/loadstatus</code></li>
+</ul>
+<p>Returns JSON of the form <code>{&quot;cacheInitialized&quot;:&lt;value&gt;}</code>, where value is either <code>true</code> or <code>false</code> indicating if all
+segments in the local cache have been loaded. This can be used to know when a Historical process is ready
+to be queried after a restart.</p>
+<ul>
+<li><code>/druid/historical/v1/readiness</code></li>
+</ul>
+<p>Similar to <code>/druid/historical/v1/loadstatus</code>, but instead of returning JSON with a flag, responses 200 OK if segments
+in the local cache have been loaded, and 503 SERVICE UNAVAILABLE, if they haven't.</p>
+<h2><a class="anchor" aria-hidden="true" id="query-server"></a><a href="#query-server" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Query Server</h2>
+<p>This section documents the API endpoints for the processes that reside on Query servers (Brokers) in the suggested <a href="../design/processes.html#server-types">three-server configuration</a>.</p>
+<h3><a class="anchor" aria-hidden="true" id="broker"></a><a href="#broker" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Broker</h3>
+<h4><a class="anchor" aria-hidden="true" id="datasource-information"></a><a href="#datasource-information" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Datasource Information</h4>
+<p>Note that all <em>interval</em> URL parameters are ISO 8601 strings delimited by a <code>_</code> instead of a <code>/</code>
+(e.g., 2016-06-27_2016-06-28).</p>
+<h5><a class="anchor" aria-hidden="true" id="get-18"></a><a href="#get-18" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>GET</h5>
+<ul>
+<li><code>/druid/v2/datasources</code></li>
+</ul>
+<p>Returns a list of queryable datasources.</p>
+<ul>
+<li><code>/druid/v2/datasources/{dataSourceName}</code></li>
+</ul>
+<p>Returns the dimensions and metrics of the datasource. Optionally, you can provide request parameter &quot;full&quot; to get list of served intervals with dimensions and metrics being served for those intervals. You can also provide request param &quot;interval&quot; explicitly to refer to a particular interval.</p>
+<p>If no interval is specified, a default interval spanning a configurable period before the current time will be used. The default duration of this interval is specified in ISO 8601 duration format via:</p>
+<p>druid.query.segmentMetadata.defaultHistory</p>
+<ul>
+<li><code>/druid/v2/datasources/{dataSourceName}/dimensions</code></li>
+</ul>
+<p>Returns the dimensions of the datasource.</p>
+<blockquote>
+<p>This API is deprecated and will be removed in future releases. Please use <a href="/docs/0.20.0/querying/segmentmetadataquery.html">SegmentMetadataQuery</a> instead
+which provides more comprehensive information and supports all dataSource types including streaming dataSources. It's also encouraged to use <a href="/docs/0.20.0/querying/sql.html#metadata-tables">INFORMATION_SCHEMA tables</a>
+if you're using SQL.</p>
+</blockquote>
+<ul>
+<li><code>/druid/v2/datasources/{dataSourceName}/metrics</code></li>
+</ul>
+<p>Returns the metrics of the datasource.</p>
+<blockquote>
+<p>This API is deprecated and will be removed in future releases. Please use <a href="/docs/0.20.0/querying/segmentmetadataquery.html">SegmentMetadataQuery</a> instead
+which provides more comprehensive information and supports all dataSource types including streaming dataSources. It's also encouraged to use <a href="/docs/0.20.0/querying/sql.html#metadata-tables">INFORMATION_SCHEMA tables</a>
+if you're using SQL.</p>
+</blockquote>
+<ul>
+<li><code>/druid/v2/datasources/{dataSourceName}/candidates?intervals={comma-separated-intervals}&amp;numCandidates={numCandidates}</code></li>
+</ul>
+<p>Returns segment information lists including server locations for the given datasource and intervals. If &quot;numCandidates&quot; is not specified, it will return all servers for each interval.</p>
+<h4><a class="anchor" aria-hidden="true" id="load-status"></a><a href="#load-status" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Load Status</h4>
+<h5><a class="anchor" aria-hidden="true" id="get-19"></a><a href="#get-19" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>GET</h5>
+<ul>
+<li><code>/druid/broker/v1/loadstatus</code></li>
+</ul>
+<p>Returns a flag indicating if the Broker knows about all segments in the cluster. This can be used to know when a Broker process is ready to be queried after a restart.</p>
+<ul>
+<li><code>/druid/broker/v1/readiness</code></li>
+</ul>
+<p>Similar to <code>/druid/broker/v1/loadstatus</code>, but instead of returning a JSON, responses 200 OK if its ready and otherwise 503 SERVICE UNAVAILABLE.</p>
+<h4><a class="anchor" aria-hidden="true" id="queries"></a><a href="#queries" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Queries</h4>
+<h5><a class="anchor" aria-hidden="true" id="post-8"></a><a href="#post-8" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>POST</h5>
+<ul>
+<li><code>/druid/v2/</code></li>
+</ul>
+<p>The endpoint for submitting queries. Accepts an option <code>?pretty</code> that pretty prints the results.</p>
+<ul>
+<li><code>/druid/v2/candidates/</code></li>
+</ul>
+<p>Returns segment information lists including server locations for the given query..</p>
+<h3><a class="anchor" aria-hidden="true" id="router"></a><a href="#router" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Router</h3>
+<h4><a class="anchor" aria-hidden="true" id="get-20"></a><a href="#get-20" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>GET</h4>
+<ul>
+<li><code>/druid/v2/datasources</code></li>
+</ul>
+<p>Returns a list of queryable datasources.</p>
+<ul>
+<li><code>/druid/v2/datasources/{dataSourceName}</code></li>
+</ul>
+<p>Returns the dimensions and metrics of the datasource.</p>
+<ul>
+<li><code>/druid/v2/datasources/{dataSourceName}/dimensions</code></li>
+</ul>
+<p>Returns the dimensions of the datasource.</p>
+<ul>
+<li><code>/druid/v2/datasources/{dataSourceName}/metrics</code></li>
+</ul>
+<p>Returns the metrics of the datasource.</p>
+</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/0.20.0/operations/basic-cluster-tuning.html"><span class="arrow-prev">← </span><span>Basic cluster tuning</span></a><a class="docs-next button" href="/docs/0.20.0/operations/high-availability.html"><span>High availability</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#common">Common</a><ul class="toc-headings"><li><a href="#process-information">Process information</a></li></ul></li><li><a href="#master-server">Master Server</a><ul class="toc-headings"><li><a href="#coordinator">Coordinator</a></li><li><a href="#overlord">Overlord</a></li></ul></li><li><a href="#data-server">Data Server</a><ul class="toc-headings"><li><a href="#middlemanager">MiddleManager</a></li><li><a href="#peon">Peon</a></li><li><a href="#historical">Historical</a></li></ul></li><li><a href="#query-server">Query Server</a><ul class="toc-headings"><li><a href="#broker">Broker</a></li><li><a href="#router">Router</a></li></ul></li></ul></nav></div><footer class="nav-footer druid-footer" id="footer"><div class="container"><div class="text-center"><p><a href="/technology">Technology</a> · <a href="/use-cases">Use Cases</a> · <a href="/druid-powered">Powered by Druid</a> · <a href="/docs/0.20.0/latest">Docs</a> · <a href="/community/">Community</a> · <a href="/downloads.html">Download</a> · <a href="/faq">FAQ</a></p></div><div class="text-center"><a title="Join the user group" href="https://groups.google.com/forum/#!forum/druid-user" target="_blank"><span class="fa fa-comments"></span></a> · <a title="Follow Druid" href="https://twitter.com/druidio" target="_blank"><span class="fab fa-twitter"></span></a> · <a title="Download via Apache" href="https://www.apache.org/dyn/closer.cgi?path=/incubator/druid/{{ site.druid_versions[0].versions[0].version }}/apache-druid-{{ site.druid_versions[0].versions[0].version }}-bin.tar.gz" target="_blank"><span class="fas fa-feather"></span></a> · <a title="GitHub" href="https://github.com/apache/druid" target="_blank"><span class="fab fa-github"></span></a></div><div class="text-center license">Copyright © 2019 <a href="https://www.apache.org/" target="_blank">Apache Software Foundation</a>.<br/>Except where otherwise noted, licensed under <a rel="license" href="http://creativecommons.org/licenses/by-sa/4.0/">CC BY-SA 4.0</a>.<br/>Apache Druid, Druid, and the Druid logo are either registered trademarks or trademarks of The Apache Software Foundation in the United States and other countries.</div></div></footer></div><script type="text/javascript" src="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.js"></script><script>
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@@ -0,0 +1,359 @@
+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Basic cluster tuning · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/0.20.0/operations/basic-cluster-tuning.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.20.0" /><meta property="og:title" content="Basic cluster tuning · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
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+<p>This document provides basic guidelines for configuration properties and cluster architecture considerations related to performance tuning of an Apache Druid deployment.</p>
+<p>Please note that this document provides general guidelines and rules-of-thumb: these are not absolute, universal rules for cluster tuning, and this introductory guide is not an exhaustive description of all Druid tuning properties, which are described in the <a href="/docs/0.20.0/configuration/index.html">configuration reference</a>.</p>
+<p>If you have questions on tuning Druid for specific use cases, or questions on configuration properties not covered in this guide, please ask the <a href="https://druid.apache.org/community/">Druid user mailing list or other community channels</a>.</p>
+<h2><a class="anchor" aria-hidden="true" id="process-specific-guidelines"></a><a href="#process-specific-guidelines" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Process-specific guidelines</h2>
+<h3><a class="anchor" aria-hidden="true" id="historical"></a><a href="#historical" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Historical</h3>
+<h4><a class="anchor" aria-hidden="true" id="heap-sizing"></a><a href="#heap-sizing" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Heap sizing</h4>
+<p>The biggest contributions to heap usage on Historicals are:</p>
+<ul>
+<li>Partial unmerged query results from segments</li>
+<li>The stored maps for <a href="/docs/0.20.0/querying/lookups.html">lookups</a>.</li>
+</ul>
+<p>A general rule-of-thumb for sizing the Historical heap is <code>(0.5GB * number of CPU cores)</code>, with an upper limit of ~24GB.</p>
+<p>This rule-of-thumb scales using the number of CPU cores as a convenient proxy for hardware size and level of concurrency (note: this formula is not a hard rule for sizing Historical heaps).</p>
+<p>Having a heap that is too large can result in excessively long GC collection pauses, the ~24GB upper limit is imposed to avoid this.</p>
+<p>If caching is enabled on Historicals, the cache is stored on heap, sized by <code>druid.cache.sizeInBytes</code>.</p>
+<p>Running out of heap on the Historicals can indicate misconfiguration or usage patterns that are overloading the cluster.</p>
+<h5><a class="anchor" aria-hidden="true" id="lookups"></a><a href="#lookups" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Lookups</h5>
+<p>If you are using lookups, calculate the total size of the lookup maps being loaded.</p>
+<p>Druid performs an atomic swap when updating lookup maps (both the old map and the new map will exist in heap during the swap), so the maximum potential heap usage from lookup maps will be (2 * total size of all loaded lookups).</p>
+<p>Be sure to add <code>(2 * total size of all loaded lookups)</code> to your heap size in addition to the <code>(0.5GB * number of CPU cores)</code> guideline.</p>
+<h4><a class="anchor" aria-hidden="true" id="processing-threads-and-buffers"></a><a href="#processing-threads-and-buffers" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Processing Threads and Buffers</h4>
+<p>Please see the <a href="#processing-threads-buffers">General Guidelines for Processing Threads and Buffers</a> section for an overview of processing thread/buffer configuration.</p>
+<p>On Historicals:</p>
+<ul>
+<li><code>druid.processing.numThreads</code> should generally be set to <code>(number of cores - 1)</code>: a smaller value can result in CPU underutilization, while going over the number of cores can result in unnecessary CPU contention.</li>
+<li><code>druid.processing.buffer.sizeBytes</code> can be set to 500MB.</li>
+<li><code>druid.processing.numMergeBuffers</code>, a 1:4 ratio of  merge buffers to processing threads is a reasonable choice for general use.</li>
+</ul>
+<h4><a class="anchor" aria-hidden="true" id="direct-memory-sizing"></a><a href="#direct-memory-sizing" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Direct Memory Sizing</h4>
+<p>The processing and merge buffers described above are direct memory buffers.</p>
+<p>When a historical processes a query, it must open a set of segments for reading. This also requires some direct memory space, described in <a href="#segment-decompression">segment decompression buffers</a>.</p>
+<p>A formula for estimating direct memory usage follows:</p>
+<p>(<code>druid.processing.numThreads</code> + <code>druid.processing.numMergeBuffers</code> + 1) * <code>druid.processing.buffer.sizeBytes</code></p>
+<p>The <code>+ 1</code> factor is a fuzzy estimate meant to account for the segment decompression buffers.</p>
+<h4><a class="anchor" aria-hidden="true" id="connection-pool-sizing"></a><a href="#connection-pool-sizing" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Connection pool sizing</h4>
+<p>Please see the <a href="#connection-pool">General Connection Pool Guidelines</a> section for an overview of connection pool configuration.</p>
+<p>For Historicals, <code>druid.server.http.numThreads</code> should be set to a value slightly higher than the sum of <code>druid.broker.http.numConnections</code> across all the Brokers in the cluster.</p>
+<p>Tuning the cluster so that each Historical can accept 50 queries and 10 non-queries is a reasonable starting point.</p>
+<h4><a class="anchor" aria-hidden="true" id="segment-cache-size"></a><a href="#segment-cache-size" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Segment Cache Size</h4>
+<p><code>druid.segmentCache.locations</code> specifies locations where segment data can be stored on the Historical. The sum of available disk space across these locations is set as the default value for property: <code>druid.server.maxSize</code>, which controls the total size of segment data that can be assigned by the Coordinator to a Historical.</p>
+<p>Segments are memory-mapped by Historical processes using any available free system memory (i.e., memory not used by the Historical JVM and heap/direct memory buffers or other processes on the system). Segments that are not currently in memory will be paged from disk when queried.</p>
+<p>Therefore, the size of cache locations set within <code>druid.segmentCache.locations</code> should be such that a Historical is not allocated an excessive amount of segment data. As the value of (<code>free system memory</code> / total size of all <code>druid.segmentCache.locations</code>) increases, a greater proportion of segments can be kept in memory, allowing for better query performance. The total segment data size assigned to a Historical can be overridden with <code>druid.server.maxSize</code>, but this is not required for most of the use cases.</p>
+<h4><a class="anchor" aria-hidden="true" id="number-of-historicals"></a><a href="#number-of-historicals" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Number of Historicals</h4>
+<p>The number of Historicals needed in a cluster depends on how much data the cluster has. For good performance, you will want enough Historicals such that each Historical has a good (<code>free system memory</code> / total size of all <code>druid.segmentCache.locations</code>) ratio, as described in the segment cache size section above.</p>
+<p>Having a smaller number of big servers is generally better than having a large number of small servers, as long as you have enough fault tolerance for your use case.</p>
+<h4><a class="anchor" aria-hidden="true" id="ssd-storage"></a><a href="#ssd-storage" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>SSD storage</h4>
+<p>We recommend using SSDs for storage on the Historicals, as they handle segment data stored on disk.</p>
+<h4><a class="anchor" aria-hidden="true" id="total-memory-usage"></a><a href="#total-memory-usage" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Total memory usage</h4>
+<p>To estimate total memory usage of the Historical under these guidelines:</p>
+<ul>
+<li>Heap: <code>(0.5GB * number of CPU cores) + (2 * total size of lookup maps) + druid.cache.sizeInBytes</code></li>
+<li>Direct Memory: <code>(druid.processing.numThreads + druid.processing.numMergeBuffers + 1) * druid.processing.buffer.sizeBytes</code></li>
+</ul>
+<p>The Historical will use any available free system memory (i.e., memory not used by the Historical JVM and heap/direct memory buffers or other processes on the system) for memory-mapping of segments on disk. For better query performance, you will want to ensure a good (<code>free system memory</code> / total size of all <code>druid.segmentCache.locations</code>) ratio so that a greater proportion of segments can be kept in memory.</p>
+<h4><a class="anchor" aria-hidden="true" id="segment-sizes-matter"></a><a href="#segment-sizes-matter" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Segment sizes matter</h4>
+<p>Be sure to check out <a href="/docs/0.20.0/operations/segment-optimization.html">segment size optimization</a> to help tune your Historical processes for maximum performance.</p>
+<h3><a class="anchor" aria-hidden="true" id="broker"></a><a href="#broker" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Broker</h3>
+<h4><a class="anchor" aria-hidden="true" id="heap-sizing-1"></a><a href="#heap-sizing-1" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Heap sizing</h4>
+<p>The biggest contributions to heap usage on Brokers are:</p>
+<ul>
+<li>Partial unmerged query results from Historicals and Tasks</li>
+<li>The segment timeline: this consists of location information (which Historical/Task is serving a segment) for all currently <a href="/docs/0.20.0/design/architecture.html#segment-lifecycle">available</a> segments.</li>
+<li>Cached segment metadata: this consists of metadata, such as per-segment schemas, for all currently available segments.</li>
+</ul>
+<p>The Broker heap requirements scale based on the number of segments in the cluster, and the total data size of the segments.</p>
+<p>The heap size will vary based on data size and usage patterns, but 4G to 8G is a good starting point for a small or medium cluster (~15 servers or less). For a rough estimate of memory requirements on the high end, very large clusters with a node count on the order of ~100 nodes may need Broker heaps of 30GB-60GB.</p>
+<p>If caching is enabled on the Broker, the cache is stored on heap, sized by <code>druid.cache.sizeInBytes</code>.</p>
+<h4><a class="anchor" aria-hidden="true" id="direct-memory-sizing-1"></a><a href="#direct-memory-sizing-1" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Direct memory sizing</h4>
+<p>On the Broker, the amount of direct memory needed depends on how many merge buffers (used for merging GroupBys) are configured. The Broker does not generally need processing threads or processing buffers, as query results are merged on-heap in the HTTP connection threads instead.</p>
+<ul>
+<li><code>druid.processing.buffer.sizeBytes</code> can be set to 500MB.</li>
+<li><code>druid.processing.numThreads</code>: set this to 1 (the minimum allowed)</li>
+<li><code>druid.processing.numMergeBuffers</code>: set this to the same value as on Historicals or a bit higher</li>
+</ul>
+<h4><a class="anchor" aria-hidden="true" id="connection-pool-sizing-1"></a><a href="#connection-pool-sizing-1" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Connection pool sizing</h4>
+<p>Please see the <a href="#connection-pool">General Connection Pool Guidelines</a> section for an overview of connection pool configuration.</p>
+<p>On the Brokers, please ensure that the sum of <code>druid.broker.http.numConnections</code> across all the Brokers is slightly lower than the value of <code>druid.server.http.numThreads</code> on your Historicals and Tasks.</p>
+<p><code>druid.server.http.numThreads</code> on the Broker should be set to a value slightly higher than <code>druid.broker.http.numConnections</code> on the same Broker.</p>
+<p>Tuning the cluster so that each Historical can accept 50 queries and 10 non-queries, adjusting the Brokers accordingly, is a reasonable starting point.</p>
+<h4><a class="anchor" aria-hidden="true" id="broker-backpressure"></a><a href="#broker-backpressure" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Broker backpressure</h4>
+<p>When retrieving query results from Historical processes or Tasks, the Broker can optionally specify a maximum buffer size for queued, unread data, and exert backpressure on the channel to the Historical or Tasks when limit is reached (causing writes to the channel to block on the Historical/Task side until the Broker is able to drain some data from the channel).</p>
+<p>This buffer size is controlled by the <code>druid.broker.http.maxQueuedBytes</code> setting.</p>
+<p>The limit is divided across the number of Historicals/Tasks that a query would hit: suppose I have <code>druid.broker.http.maxQueuedBytes</code> set to 5MB, and the Broker receives a query that needs to be fanned out to 2 Historicals. Each per-historical channel would get a 2.5MB buffer in this case.</p>
+<p>You can generally set this to a value of approximately <code>2MB * number of Historicals</code>. As your cluster scales up with more Historicals and Tasks, consider increasing this buffer size and increasing the Broker heap accordingly.</p>
+<ul>
+<li>If the buffer is too small, this can lead to inefficient queries due to the buffer filling up rapidly and stalling the channel</li>
+<li>If the buffer is too large, this puts more memory pressure on the Broker due to more queued result data in the HTTP channels.</li>
+</ul>
+<h4><a class="anchor" aria-hidden="true" id="number-of-brokers"></a><a href="#number-of-brokers" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Number of brokers</h4>
+<p>A 1:15 ratio of Brokers to Historicals is a reasonable starting point (this is not a hard rule).</p>
+<p>If you need Broker HA, you can deploy 2 initially and then use the 1:15 ratio guideline for additional Brokers.</p>
+<h4><a class="anchor" aria-hidden="true" id="total-memory-usage-1"></a><a href="#total-memory-usage-1" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Total memory usage</h4>
+<p>To estimate total memory usage of the Broker under these guidelines:</p>
+<ul>
+<li>Heap: allocated heap size</li>
+<li>Direct Memory: <code>(druid.processing.numThreads + druid.processing.numMergeBuffers + 1) * druid.processing.buffer.sizeBytes</code></li>
+</ul>
+<h3><a class="anchor" aria-hidden="true" id="middlemanager"></a><a href="#middlemanager" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>MiddleManager</h3>
+<p>The MiddleManager is a lightweight task controller/manager that launches Task processes, which perform ingestion work.</p>
+<h4><a class="anchor" aria-hidden="true" id="middlemanager-heap-sizing"></a><a href="#middlemanager-heap-sizing" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>MiddleManager heap sizing</h4>
+<p>The MiddleManager itself does not require much resources, you can set the heap to ~128MB generally.</p>
+<h4><a class="anchor" aria-hidden="true" id="ssd-storage-1"></a><a href="#ssd-storage-1" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>SSD storage</h4>
+<p>We recommend using SSDs for storage on the MiddleManagers, as the Tasks launched by MiddleManagers handle segment data stored on disk.</p>
+<h4><a class="anchor" aria-hidden="true" id="task-count"></a><a href="#task-count" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Task Count</h4>
+<p>The number of tasks a MiddleManager can launch is controlled by the <code>druid.worker.capacity</code> setting.</p>
+<p>The number of workers needed in your cluster depends on how many concurrent ingestion tasks you need to run for your use cases. The number of workers that can be launched on a given machine depends on the size of resources allocated per worker and available system resources.</p>
+<p>You can allocate more MiddleManager machines to your cluster to add task capacity.</p>
+<h4><a class="anchor" aria-hidden="true" id="task-configurations"></a><a href="#task-configurations" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Task configurations</h4>
+<p>The following section below describes configuration for Tasks launched by the MiddleManager. The Tasks can be queried and perform ingestion workloads, so they require more resources than the MM.</p>
+<h5><a class="anchor" aria-hidden="true" id="task-heap-sizing"></a><a href="#task-heap-sizing" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Task heap sizing</h5>
+<p>A 1GB heap is usually enough for Tasks.</p>
+<h6><a class="anchor" aria-hidden="true" id="lookups-1"></a><a href="#lookups-1" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Lookups</h6>
+<p>If you are using lookups, calculate the total size of the lookup maps being loaded.</p>
+<p>Druid performs an atomic swap when updating lookup maps (both the old map and the new map will exist in heap during the swap), so the maximum potential heap usage from lookup maps will be (2 * total size of all loaded lookups).</p>
+<p>Be sure to add <code>(2 * total size of all loaded lookups)</code> to your Task heap size if you are using lookups.</p>
+<h5><a class="anchor" aria-hidden="true" id="task-processing-threads-and-buffers"></a><a href="#task-processing-threads-and-buffers" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Task processing threads and buffers</h5>
+<p>For Tasks, 1 or 2 processing threads are often enough, as the Tasks tend to hold much less queryable data than Historical processes.</p>
+<ul>
+<li><code>druid.indexer.fork.property.druid.processing.numThreads</code>: set this to 1 or 2</li>
+<li><code>druid.indexer.fork.property.druid.processing.numMergeBuffers</code>: set this to 2</li>
+<li><code>druid.indexer.fork.property.druid.processing.buffer.sizeBytes</code>: can be set to 100MB</li>
+</ul>
+<h5><a class="anchor" aria-hidden="true" id="direct-memory-sizing-2"></a><a href="#direct-memory-sizing-2" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Direct memory sizing</h5>
+<p>The processing and merge buffers described above are direct memory buffers.</p>
+<p>When a Task processes a query, it must open a set of segments for reading. This also requires some direct memory space, described in <a href="#segment-decompression">segment decompression buffers</a>.</p>
+<p>An ingestion Task also needs to merge partial ingestion results, which requires direct memory space, described in <a href="#segment-merging">segment merging</a>.</p>
+<p>A formula for estimating direct memory usage follows:</p>
+<p>(<code>druid.processing.numThreads</code> + <code>druid.processing.numMergeBuffers</code> + 1) * <code>druid.processing.buffer.sizeBytes</code></p>
+<p>The <code>+ 1</code> factor is a fuzzy estimate meant to account for the segment decompression buffers and dictionary merging buffers.</p>
+<h5><a class="anchor" aria-hidden="true" id="connection-pool-sizing-2"></a><a href="#connection-pool-sizing-2" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Connection pool sizing</h5>
+<p>Please see the <a href="#connection-pool">General Connection Pool Guidelines</a> section for an overview of connection pool configuration.</p>
+<p>For Tasks, <code>druid.server.http.numThreads</code> should be set to a value slightly higher than the sum of <code>druid.broker.http.numConnections</code> across all the Brokers in the cluster.</p>
+<p>Tuning the cluster so that each Task can accept 50 queries and 10 non-queries is a reasonable starting point.</p>
+<h4><a class="anchor" aria-hidden="true" id="total-memory-usage-2"></a><a href="#total-memory-usage-2" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Total memory usage</h4>
+<p>To estimate total memory usage of a Task under these guidelines:</p>
+<ul>
+<li>Heap: <code>1GB + (2 * total size of lookup maps)</code></li>
+<li>Direct Memory: <code>(druid.processing.numThreads + druid.processing.numMergeBuffers + 1) * druid.processing.buffer.sizeBytes</code></li>
+</ul>
+<p>The total memory usage of the MiddleManager + Tasks:</p>
+<p><code>MM heap size + druid.worker.capacity * (single task memory usage)</code></p>
+<h5><a class="anchor" aria-hidden="true" id="configuration-guidelines-for-specific-ingestion-types"></a><a href="#configuration-guidelines-for-specific-ingestion-types" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Configuration guidelines for specific ingestion types</h5>
+<h6><a class="anchor" aria-hidden="true" id="kafkakinesis-ingestion"></a><a href="#kafkakinesis-ingestion" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Kafka/Kinesis ingestion</h6>
+<p>If you use the <a href="/docs/0.20.0/development/extensions-core/kafka-ingestion.html">Kafka Indexing Service</a> or <a href="/docs/0.20.0/development/extensions-core/kinesis-ingestion.html">Kinesis Indexing Service</a>, the number of tasks required will depend on the number of partitions and your taskCount/replica settings.</p>
+<p>On top of those requirements, allocating more task slots in your cluster is a good idea, so that you have free task
+slots available for other tasks, such as <a href="/docs/0.20.0/ingestion/data-management.html#compact">compaction tasks</a>.</p>
+<h6><a class="anchor" aria-hidden="true" id="hadoop-ingestion"></a><a href="#hadoop-ingestion" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Hadoop ingestion</h6>
+<p>If you are only using <a href="/docs/0.20.0/ingestion/hadoop.html">Hadoop-based batch ingestion</a> with no other ingestion types, you can lower the amount of resources allocated per Task. Batch ingestion tasks do not need to answer queries, and the bulk of the ingestion workload will be executed on the Hadoop cluster, so the Tasks do not require much resources.</p>
+<h6><a class="anchor" aria-hidden="true" id="parallel-native-ingestion"></a><a href="#parallel-native-ingestion" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Parallel native ingestion</h6>
+<p>If you are using <a href="/docs/0.20.0/ingestion/native-batch.html#parallel-task">parallel native batch ingestion</a>, allocating more available task slots is a good idea and will allow greater ingestion concurrency.</p>
+<h3><a class="anchor" aria-hidden="true" id="coordinator"></a><a href="#coordinator" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Coordinator</h3>
+<p>The main performance-related setting on the Coordinator is the heap size.</p>
+<p>The heap requirements of the Coordinator scale with the number of servers, segments, and tasks in the cluster.</p>
+<p>You can set the Coordinator heap to the same size as your Broker heap, or slightly smaller: both services have to process cluster-wide state and answer API requests about this state.</p>
+<h3><a class="anchor" aria-hidden="true" id="overlord"></a><a href="#overlord" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Overlord</h3>
+<p>The main performance-related setting on the Overlord is the heap size.</p>
+<p>The heap requirements of the Overlord scale primarily with the number of running Tasks.</p>
+<p>The Overlord tends to require less resources than the Coordinator or Broker. You can generally set the Overlord heap to a value that's 25-50% of your Coordinator heap.</p>
+<h3><a class="anchor" aria-hidden="true" id="router"></a><a href="#router" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Router</h3>
+<p>The Router has light resource requirements, as it proxies requests to Brokers without performing much computational work itself.</p>
+<p>You can assign it 256MB heap as a starting point, growing it if needed.</p>
+<p><a name="processing-threads-buffers"></a></p>
+<h2><a class="anchor" aria-hidden="true" id="guidelines-for-processing-threads-and-buffers"></a><a href="#guidelines-for-processing-threads-and-buffers" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Guidelines for processing threads and buffers</h2>
+<h3><a class="anchor" aria-hidden="true" id="processing-threads"></a><a href="#processing-threads" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Processing threads</h3>
+<p>The <code>druid.processing.numThreads</code> configuration controls the size of the processing thread pool used for computing query results. The size of this pool limits how many queries can be concurrently processed.</p>
+<h3><a class="anchor" aria-hidden="true" id="processing-buffers"></a><a href="#processing-buffers" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Processing buffers</h3>
+<p><code>druid.processing.buffer.sizeBytes</code> is a closely related property that controls the size of the off-heap buffers allocated to the processing threads.</p>
+<p>One buffer is allocated for each processing thread. A size between 500MB and 1GB is a reasonable choice for general use.</p>
+<p>The TopN and GroupBy queries use these buffers to store intermediate computed results. As the buffer size increases, more data can be processed in a single pass.</p>
+<h3><a class="anchor" aria-hidden="true" id="groupby-merging-buffers"></a><a href="#groupby-merging-buffers" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>GroupBy merging buffers</h3>
+<p>If you plan to issue GroupBy V2 queries, <code>druid.processing.numMergeBuffers</code> is an important configuration property.</p>
+<p>GroupBy V2 queries use an additional pool of off-heap buffers for merging query results. These buffers have the same size as the processing buffers described above, set by the <code>druid.processing.buffer.sizeBytes</code> property.</p>
+<p>Non-nested GroupBy V2 queries require 1 merge buffer per query, while a nested GroupBy V2 query requires 2 merge buffers (regardless of the depth of nesting).</p>
+<p>The number of merge buffers determines the number of GroupBy V2 queries that can be processed concurrently.</p>
+<p><a name="connection-pool"></a></p>
+<h2><a class="anchor" aria-hidden="true" id="connection-pool-guidelines"></a><a href="#connection-pool-guidelines" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Connection pool guidelines</h2>
+<p>Each Druid process has a configuration property for the number of HTTP connection handling threads, <code>druid.server.http.numThreads</code>.</p>
+<p>The number of HTTP server threads limits how many concurrent HTTP API requests a given process can handle.</p>
+<h3><a class="anchor" aria-hidden="true" id="sizing-the-connection-pool-for-queries"></a><a href="#sizing-the-connection-pool-for-queries" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Sizing the connection pool for queries</h3>
+<p>The Broker has a setting <code>druid.broker.http.numConnections</code> that controls how many outgoing connections it can make to a given Historical or Task process.</p>
+<p>These connections are used to send queries to the Historicals or Tasks, with one connection per query; the value of <code>druid.broker.http.numConnections</code> is effectively a limit on the number of concurrent queries that a given broker can process.</p>
+<p>Suppose we have a cluster with 3 Brokers and <code>druid.broker.http.numConnections</code> is set to 10.</p>
+<p>This means that each Broker in the cluster will open up to 10 connections to each individual Historical or Task (for a total of 30 incoming query connections per Historical/Task).</p>
+<p>On the Historical/Task side, this means that <code>druid.server.http.numThreads</code> must be set to a value at least as high as the sum of <code>druid.broker.http.numConnections</code> across all the Brokers in the cluster.</p>
+<p>In practice, you will want to allocate additional server threads for non-query API requests such as status checks; adding 10 threads for those is a good general guideline. Using the example with 3 Brokers in the cluster and <code>druid.broker.http.numConnections</code> set to 10, a value of 40 would be appropriate for <code>druid.server.http.numThreads</code> on Historicals and Tasks.</p>
+<p>As a starting point, allowing for 50 concurrent queries (requests that read segment data from datasources) + 10 non-query requests (other requests like status checks) on Historicals and Tasks is reasonable (i.e., set <code>druid.server.http.numThreads</code> to 60 there), while sizing <code>druid.broker.http.numConnections</code> based on the number of Brokers in the cluster to fit within the 50 query connection limit per Historical/Task.</p>
+<ul>
+<li>If the connection pool across Brokers and Historicals/Tasks is too small, the cluster will be underutilized as there are too few concurrent query slots.</li>
+<li>If the connection pool is too large, you may get out-of-memory errors due to excessive concurrent load, and increased resource contention.</li>
+<li>The connection pool sizing matters most when you require QoS-type guarantees and use query priorities; otherwise, these settings can be more loosely configured.</li>
+<li>If your cluster usage patterns are heavily biased towards a high number of small concurrent queries (where each query takes less than ~15ms), enlarging the connection pool can be a good idea.</li>
+<li>The 50/10 general guideline here is a rough starting point, since different queries impose different amounts of load on the system. To size the connection pool more exactly for your cluster, you would need to know the execution times for your queries and ensure that the rate of incoming queries does not exceed your &quot;drain&quot; rate.</li>
+</ul>
+<h2><a class="anchor" aria-hidden="true" id="per-segment-direct-memory-buffers"></a><a href="#per-segment-direct-memory-buffers" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Per-segment direct memory buffers</h2>
+<h3><a class="anchor" aria-hidden="true" id="segment-decompression"></a><a href="#segment-decompression" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Segment decompression</h3>
+<p>When opening a segment for reading during segment merging or query processing, Druid allocates a 64KB off-heap decompression buffer for each column being read.</p>
+<p>Thus, there is additional direct memory overhead of (64KB * number of columns read per segment * number of segments read) when reading segments.</p>
+<h3><a class="anchor" aria-hidden="true" id="segment-merging"></a><a href="#segment-merging" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Segment merging</h3>
+<p>In addition to the segment decompression overhead described above, when a set of segments are merged during ingestion, a direct buffer is allocated for every String typed column, for every segment in the set to be merged.</p>
+<p>The size of these buffers are equal to the cardinality of the String column within its segment, times 4 bytes (the buffers store integers).</p>
+<p>For example, if two segments are being merged, the first segment having a single String column with cardinality 1000, and the second segment having a String column with cardinality 500, the merge step would allocate (1000 + 500) * 4 = 6000 bytes of direct memory.</p>
+<p>These buffers are used for merging the value dictionaries of the String column across segments. These &quot;dictionary merging buffers&quot; are independent of the &quot;merge buffers&quot; configured by <code>druid.processing.numMergeBuffers</code>.</p>
+<h2><a class="anchor" aria-hidden="true" id="general-recommendations"></a><a href="#general-recommendations" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>General recommendations</h2>
+<h3><a class="anchor" aria-hidden="true" id="jvm-tuning"></a><a href="#jvm-tuning" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>JVM tuning</h3>
+<h4><a class="anchor" aria-hidden="true" id="garbage-collection"></a><a href="#garbage-collection" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Garbage Collection</h4>
+<p>We recommend using the G1GC garbage collector:</p>
+<p><code>-XX:+UseG1GC</code></p>
+<p>Enabling process termination on out-of-memory errors is useful as well, since the process generally will not recover from such a state, and it's better to restart the process:</p>
+<p><code>-XX:+ExitOnOutOfMemoryError</code></p>
+<h4><a class="anchor" aria-hidden="true" id="other-useful-jvm-flags"></a><a href="#other-useful-jvm-flags" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Other useful JVM flags</h4>
+<pre><code class="hljs">-Duser.<span class="hljs-attribute">timezone</span>=UTC
+-Dfile.<span class="hljs-attribute">encoding</span>=UTF-8
+-Djava.io.<span class="hljs-attribute">tmpdir</span>=&lt;should <span class="hljs-keyword">not</span> be volatile tmpfs <span class="hljs-keyword">and</span> also has good read <span class="hljs-keyword">and</span> write speed. Strongly recommended <span class="hljs-keyword">to</span> avoid using NFS mount&gt;
+-Djava.util.logging.<span class="hljs-attribute">manager</span>=org.apache.logging.log4j.jul.LogManager
+-Dorg.jboss.logging.<span class="hljs-attribute">provider</span>=slf4j
+-Dnet.spy.log.<span class="hljs-attribute">LoggerImpl</span>=net.spy.memcached.compat.log.SLF4JLogger
+-Dlog4j.<span class="hljs-attribute">shutdownCallbackRegistry</span>=org.apache.druid.common.config.Log4jShutdown
+-Dlog4j.<span class="hljs-attribute">shutdownHookEnabled</span>=<span class="hljs-literal">true</span>
+-XX:+PrintGCDetails
+-XX:+PrintGCDateStamps
+-XX:+PrintGCTimeStamps
+-XX:+PrintGCApplicationStoppedTime
+-XX:+PrintGCApplicationConcurrentTime
+-Xloggc:/var/logs/druid/historical.gc.log
+-XX:+UseGCLogFileRotation
+-XX:<span class="hljs-attribute">NumberOfGCLogFiles</span>=50
+-XX:<span class="hljs-attribute">GCLogFileSize</span>=10m
+-XX:+ExitOnOutOfMemoryError
+-XX:+HeapDumpOnOutOfMemoryError
+-XX:<span class="hljs-attribute">HeapDumpPath</span>=/var/logs/druid/historical.hprof
+-XX:<span class="hljs-attribute">MaxDirectMemorySize</span>=1g
+</code></pre>
+<blockquote>
+<p>Please note that the flag settings above represent sample, general guidelines only. Be careful to use values appropriate
+for your specific scenario and be sure to test any changes in staging environments.</p>
+</blockquote>
+<p><code>ExitOnOutOfMemoryError</code> flag is only supported starting JDK 8u92 . For older versions, <code>-XX:OnOutOfMemoryError='kill -9 %p'</code> can be used.</p>
+<p><code>MaxDirectMemorySize</code> restricts JVM from allocating more than specified limit, by setting it to unlimited JVM restriction is lifted and OS level memory limits would still be effective. It's still important to make sure that Druid is not configured to allocate more off-heap memory than your machine has available. Important settings here include <code>druid.processing.numThreads</code>, <code>druid.processing.numMergeBuffers</code>, and <code>druid.processing.buffer.sizeBytes</code>.</p>
+<p>Additionally, for large JVM heaps, here are a few Garbage Collection efficiency guidelines that have been known to help in some cases.</p>
+<ul>
+<li>Mount /tmp on tmpfs ( See <a href="http://www.evanjones.ca/jvm-mmap-pause.html">http://www.evanjones.ca/jvm-mmap-pause.html</a> )</li>
+<li>On Disk-IO intensive processes (e.g. Historical and MiddleManager), GC and Druid logs should be written to a different disk than where data is written.</li>
+<li>Disable Transparent Huge Pages ( See <a href="https://blogs.oracle.com/linux/performance-issues-with-transparent-huge-pages-thp">https://blogs.oracle.com/linux/performance-issues-with-transparent-huge-pages-thp</a> )</li>
+<li>Try disabling biased locking by using <code>-XX:-UseBiasedLocking</code> JVM flag. ( See <a href="https://dzone.com/articles/logging-stop-world-pauses-jvm">https://dzone.com/articles/logging-stop-world-pauses-jvm</a> )</li>
+</ul>
+<h3><a class="anchor" aria-hidden="true" id="use-utc-timezone"></a><a href="#use-utc-timezone" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Use UTC timezone</h3>
+<p>We recommend using UTC timezone for all your events and across your hosts, not just for Druid, but for all data infrastructure. This can greatly mitigate potential query problems with inconsistent timezones. To query in a non-UTC timezone see <a href="../querying/granularities.html#period-granularities">query granularities</a></p>
+<h3><a class="anchor" aria-hidden="true" id="system-configuration"></a><a href="#system-configuration" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>System configuration</h3>
+<h4><a class="anchor" aria-hidden="true" id="ssds"></a><a href="#ssds" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>SSDs</h4>
+<p>SSDs are highly recommended for Historical, MiddleManager, and Indexer processes if you are not running a cluster that is entirely in memory. SSDs can greatly mitigate the time required to page data in and out of memory.</p>
+<h4><a class="anchor" aria-hidden="true" id="jbod-vs-raid"></a><a href="#jbod-vs-raid" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>JBOD vs RAID</h4>
+<p>Historical processes store large number of segments on Disk and support specifying multiple paths for storing those. Typically, hosts have multiple disks configured with RAID which makes them look like a single disk to OS. RAID might have overheads specially if its not hardware controller based but software based. So, Historicals might get improved disk throughput with JBOD.</p>
+<h4><a class="anchor" aria-hidden="true" id="swap-space"></a><a href="#swap-space" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Swap space</h4>
+<p>We recommend <em>not</em> using swap space for Historical, MiddleManager, and Indexer processes since due to the large number of memory mapped segment files can lead to poor and unpredictable performance.</p>
+<h4><a class="anchor" aria-hidden="true" id="linux-limits"></a><a href="#linux-limits" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Linux limits</h4>
+<p>For Historical, MiddleManager, and Indexer processes (and for really large clusters, Broker processes), you might need to adjust some Linux system limits to account for a large number of open files, a large number of network connections, or a large number of memory mapped files.</p>
+<h5><a class="anchor" aria-hidden="true" id="ulimit"></a><a href="#ulimit" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>ulimit</h5>
+<p>The limit on the number of open files can be set permanently by editing <code>/etc/security/limits.conf</code>. This value should be substantially greater than the number of segment files that will exist on the server.</p>
+<h5><a class="anchor" aria-hidden="true" id="max_map_count"></a><a href="#max_map_count" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>max_map_count</h5>
+<p>Historical processes and to a lesser extent, MiddleManager and Indexer processes memory map segment files, so depending on the number of segments per server, <code>/proc/sys/vm/max_map_count</code> might also need to be adjusted. Depending on the variant of Linux, this might be done via <code>sysctl</code> by placing a file in <code>/etc/sysctl.d/</code> that sets <code>vm.max_map_count</code>.</p>
+</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/0.20.0/operations/getting-started.html"><span class="arrow-prev">← </span><span>Getting started with Apache Druid</span></a><a class="docs-next button" href="/docs/0.20.0/operations/api-reference.html"><span>API reference</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#process-specific-guidelines">Process-specific guidelines</a><ul class="toc-headings"><li><a href="#historical">Historical</a></li><li><a href="#broker">Broker</a></li><li><a href="#middlemanager">MiddleManager</a></li><li><a href="#coordinator">Coordinator</a></li><li><a href="#overlord">Overlord</a></li><li><a href="#router">Router</a></li></ul></li><li><a href="#guidelines-for-processing-threads-and-buffers">Guidelines for processing threads and buffers</a><ul class="toc-headings"><li><a href="#processing-threads">Processing threads</a></li><li><a href="#processing-buffers">Processing buffers</a></li><li><a href="#groupby-merging-buffers">GroupBy merging buffers</a></li></ul></li><li><a href="#connection-pool-guidelines">Connection pool guidelines</a><ul class="toc-headings"><li><a href="#sizing-the-connection-pool-for-queries">Sizing the connection pool for queries</a></li></ul></li><li><a href="#per-segment-direct-memory-buffers">Per-segment direct memory buffers</a><ul class="toc-headings"><li><a href="#segment-decompression">Segment decompression</a></li><li><a href="#segment-merging">Segment merging</a></li></ul></li><li><a href="#general-recommendations">General recommendations</a><ul class="toc-headings"><li><a href="#jvm-tuning">JVM tuning</a></li><li><a href="#use-utc-timezone">Use UTC timezone</a></li><li><a href="#system-configuration">System configuration</a></li></ul></li></ul></nav></div><footer class="nav-footer druid-footer" id="footer"><div class="container"><div class="text-center"><p><a href="/technology">Technology</a> · <a href="/use-cases">Use Cases</a> · <a href="/druid-powered">Powered by Druid</a> · <a href="/docs/0.20.0/latest">Docs</a> · <a href="/community/">Community</a> · <a href="/downloads.html">Download</a> · <a href="/faq">FAQ</a></p></div><div class="text-center"><a title="Join the user group" href="https://groups.google.com/forum/#!forum/druid-user" target="_blank"><span class="fa fa-comments"></span></a> · <a title="Follow Druid" href="https://twitter.com/druidio" target="_blank"><span class="fab fa-twitter"></span></a> · <a title="Download via Apache" href="https://www.apache.org/dyn/closer.cgi?path=/incubator/druid/{{ site.druid_versions[0].versions[0].version }}/apache-druid-{{ site.druid_versions[0].versions[0].version }}-bin.tar.gz" target="_blank"><span class="fas fa-feather"></span></a> · <a title="GitHub" href="https://github.com/apache/druid" target="_blank"><span class="fab fa-github"></span></a></div><div class="text-center license">Copyright © 2019 <a href="https://www.apache.org/" target="_blank">Apache Software Foundation</a>.<br/>Except where otherwise noted, licensed under <a rel="license" href="http://creativecommons.org/licenses/by-sa/4.0/">CC BY-SA 4.0</a>.<br/>Apache Druid, Druid, and the Druid logo are either registered trademarks or trademarks of The Apache Software Foundation in the United States and other countries.</div></div></footer></div><script type="text/javascript" src="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.js"></script><script>
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+<p>If you have been running an evaluation Druid cluster using local deep storage and wish to migrate to a
+more production-capable deep storage system such as S3 or HDFS, this document describes the necessary steps.</p>
+<p>Migration of deep storage involves the following steps at a high level:</p>
+<ul>
+<li>Copying segments from local deep storage to the new deep storage</li>
+<li>Exporting Druid's segments table from metadata</li>
+<li>Rewriting the load specs in the exported segment data to reflect the new deep storage location</li>
+<li>Reimporting the edited segments into metadata</li>
+</ul>
+<h2><a class="anchor" aria-hidden="true" id="shut-down-cluster-services"></a><a href="#shut-down-cluster-services" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Shut down cluster services</h2>
+<p>To ensure a clean migration, shut down the non-coordinator services to ensure that metadata state will not
+change as you do the migration.</p>
+<p>When migrating from Derby, the coordinator processes will still need to be up initially, as they host the Derby database.</p>
+<h2><a class="anchor" aria-hidden="true" id="copy-segments-from-old-deep-storage-to-new-deep-storage"></a><a href="#copy-segments-from-old-deep-storage-to-new-deep-storage" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Copy segments from old deep storage to new deep storage.</h2>
+<p>Before migrating, you will need to copy your old segments to the new deep storage.</p>
+<p>For information on what path structure to use in the new deep storage, please see <a href="../operations/export-metadata.html#deep-storage-migration">deep storage migration options</a>.</p>
+<h2><a class="anchor" aria-hidden="true" id="export-segments-with-rewritten-load-specs"></a><a href="#export-segments-with-rewritten-load-specs" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Export segments with rewritten load specs</h2>
+<p>Druid provides an <a href="/docs/0.20.0/operations/export-metadata.html">Export Metadata Tool</a> for exporting metadata from Derby into CSV files
+which can then be reimported.</p>
+<p>By setting <a href="../operations/export-metadata.html#deep-storage-migration">deep storage migration options</a>, the <code>export-metadata</code> tool will export CSV files where the segment load specs have been rewritten to load from your new deep storage location.</p>
+<p>Run the <code>export-metadata</code> tool on your existing cluster, using the migration options appropriate for your new deep storage location, and save the CSV files it generates. After a successful export, you can shut down the coordinator.</p>
+<h3><a class="anchor" aria-hidden="true" id="import-metadata"></a><a href="#import-metadata" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Import metadata</h3>
+<p>After generating the CSV exports with the modified segment data, you can reimport the contents of the Druid segments table from the generated CSVs.</p>
+<p>Please refer to <a href="../operations/export-metadata.html#importing-metadata">import commands</a> for examples. Only the <code>druid_segments</code> table needs to be imported.</p>
+<h3><a class="anchor" aria-hidden="true" id="restart-cluster"></a><a href="#restart-cluster" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Restart cluster</h3>
+<p>After importing the segment table successfully, you can now restart your cluster.</p>
+</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/0.20.0/operations/management-uis.html"><span class="arrow-prev">← </span><span>Legacy Management UIs</span></a><a class="docs-next button" href="/docs/0.20.0/operations/export-metadata.html"><span>Export Metadata Tool</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#shut-down-cluster-services">Shut down cluster services</a></li><li><a href="#copy-segments-from-old-deep-storage-to-new-deep-storage">Copy segments from old deep storage to new deep storage.</a></li><li><a href="#export-segments-with-rewritten-load-specs">Export segments with rewritten load specs</a><ul class="toc-headings"><li><a href="#import-metadata">Import metadata</a></li><li><a href="#restart-cluster">Restart cluster</a></li></ul></li></ul></nav></div><footer class="nav-footer druid-footer" id="footer"><div class="container"><div class="text-center"><p><a href="/technology">Technology</a> · <a href="/use-cases">Use Cases</a> · <a href="/druid-powered">Powered by Druid</a> · <a href="/docs/0.20.0/latest">Docs</a> · <a href="/community/">Community</a> · <a href="/downloads.html">Download</a> · <a href="/faq">FAQ</a></p></div><div class="text-center"><a title="Join the user group" href="https://groups.google.com/forum/#!forum/druid-user" target="_blank"><span class="fa fa-comments"></span></a> · <a title="Follow Druid" href="https://twitter.com/druidio" target="_blank"><span class="fab fa-twitter"></span></a> · <a title="Download via Apache" href="https://www.apache.org/dyn/closer.cgi?path=/incubator/druid/{{ site.druid_versions[0].versions[0].version }}/apache-druid-{{ site.druid_versions[0].versions[0].version }}-bin.tar.gz" target="_blank"><span class="fas fa-feather"></span></a> · <a title="GitHub" href="https://github.com/apache/druid" target="_blank"><span class="fab fa-github"></span></a></div><div class="text-center license">Copyright © 2019 <a href="https://www.apache.org/" target="_blank">Apache Software Foundation</a>.<br/>Except where otherwise noted, licensed under <a rel="license" href="http://creativecommons.org/licenses/by-sa/4.0/">CC BY-SA 4.0</a>.<br/>Apache Druid, Druid, and the Druid logo are either registered trademarks or trademarks of The Apache Software Foundation in the United States and other countries.</div></div></footer></div><script type="text/javascript" src="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.js"></script><script>
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href="/docs/0.20.0/ingestion/tranquility.html">Tranquility</a></li></ul></div><div class="navGroup subNavGroup"><h4 class="navGroupSubcategoryTitle">Batch ingestion</h4><ul><li class="navListItem"><a class="navItem" href="/docs/0.20.0/ingestion/native-batch.html">Native batch</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/ingestion/hadoop.html">Hadoop-based</a></li></ul></div><li class="navListItem"><a class="navItem" href="/docs/0.20.0/ingestion/tasks.html">Task reference</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/ingestion/faq.html">Troubleshooting FAQ</a></li></ul></div><div class="navGroup"><h3 class="navGroupCategoryTitle collapsible">Querying<span class="arrow"><svg width="24" height="24" viewBox="0 0 24 24"><path fill="#565656" d="M7.41 15.41L12 10.83l4.59 4.58L18 14l-6-6-6 6z"></path><path d="M0 0h24v24H0z" fill="none"></path></svg></span></h3><ul class="hide"><li class="navListItem"><a class="navItem" href="/docs/0.20.0/querying/sql.html">Druid SQL</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/querying/querying.html">Native queries</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/querying/query-execution.html">Query execution</a></li><div class="navGroup subNavGroup"><h4 class="navGroupSubcategoryTitle">Concepts</h4><ul><li class="navListItem"><a class="navItem" href="/docs/0.20.0/querying/datasource.html">Datasources</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/querying/joins.html">Joins</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/querying/lookups.html">Lookups</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/querying/multi-value-dimensions.html">Multi-value dimensions</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/querying/multitenancy.html">Multitenancy</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/querying/caching.html">Query caching</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/querying/query-context.html">Context parameters</a></li></ul></div><div class="navGroup subNavGroup"><h4 class="navGroupSubcategoryTitle">Native query types</h4><ul><li class="navListItem"><a class="navItem" href="/docs/0.20.0/querying/timeseriesquery.html">Timeseries</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/querying/topnquery.html">TopN</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/querying/groupbyquery.html">GroupBy</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/querying/scan-query.html">Scan</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/querying/searchquery.html">Search</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/querying/timeboundaryquery.html">TimeBoundary</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/querying/segmentmetadataquery.html">SegmentMetadata</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/querying/datasourcemetadataquery.html">DatasourceMetadata</a></li></ul></div><div class="navGroup subNavGroup"><h4 class="navGroupSubcategoryTitle">Native query components</h4><ul><li class="navListItem"><a class="navItem" href="/docs/0.20.0/querying/filters.html">Filters</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/querying/granularities.html">Granularities</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/querying/dimensionspecs.html">Dimensions</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/querying/aggregations.html">Aggregations</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/querying/post-aggregations.html">Post-aggregations</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/misc/math-expr.html">Expressions</a></li><li 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Management UIs</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/operations/deep-storage-migration.html">Deep storage migration</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/operations/export-metadata.html">Export Metadata Tool</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/operations/metadata-migration.html">Metadata Migration</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/operations/segment-optimization.html">Segment Size Optimization</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/operations/use_sbt_to_build_fat_jar.html">Content for build.sbt</a></li></ul></div></ul></div><div class="navGroup"><h3 class="navGroupCategoryTitle collapsible">Development<span class="arrow"><svg width="24" height="24" viewBox="0 0 24 24"><path fill="#565656" d="M7.41 15.41L12 10.83l4.59 4.58L18 14l-6-6-6 6z"></path><path d="M0 0h24v24H0z" fill="none"></path></svg></span></h3><ul class="hide"><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/overview.html">Developing on Druid</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/modules.html">Creating extensions</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/javascript.html">JavaScript functionality</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/build.html">Build from source</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/versioning.html">Versioning</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/experimental.html">Experimental features</a></li></ul></div><div class="navGroup"><h3 class="navGroupCategoryTitle collapsible">Misc<span class="arrow"><svg width="24" height="24" viewBox="0 0 24 24"><path fill="#565656" d="M7.41 15.41L12 10.83l4.59 4.58L18 14l-6-6-6 6z"></path><path d="M0 0h24v24H0z" fill="none"></path></svg></span></h3><ul class="hide"><li class="navListItem"><a class="navItem" href="/docs/0.20.0/misc/papers-and-talks.html">Papers</a></li></ul></div><div class="navGroup"><h3 class="navGroupCategoryTitle collapsible">Hidden<span class="arrow"><svg width="24" height="24" viewBox="0 0 24 24"><path fill="#565656" d="M7.41 15.41L12 10.83l4.59 4.58L18 14l-6-6-6 6z"></path><path d="M0 0h24v24H0z" fill="none"></path></svg></span></h3><ul class="hide"><li class="navListItem"><a class="navItem" href="/docs/0.20.0/comparisons/druid-vs-elasticsearch.html">Apache Druid vs Elasticsearch</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/comparisons/druid-vs-key-value.html">Apache Druid vs. Key/Value Stores (HBase/Cassandra/OpenTSDB)</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/comparisons/druid-vs-kudu.html">Apache Druid vs Kudu</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/comparisons/druid-vs-redshift.html">Apache Druid vs Redshift</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/comparisons/druid-vs-spark.html">Apache Druid vs Spark</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/comparisons/druid-vs-sql-on-hadoop.html">Apache Druid vs SQL-on-Hadoop</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/design/auth.html">Authentication and Authorization</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/design/broker.html">Broker</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/design/coordinator.html">Coordinator Process</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/design/historical.html">Historical Process</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/design/indexer.html">Indexer Process</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/design/indexing-service.html">Indexing Service</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/design/middlemanager.html">MiddleManager Process</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/design/overlord.html">Overlord Process</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/design/router.html">Router Process</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/design/peons.html">Peons</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-core/approximate-histograms.html">Approximate Histogram aggregators</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-core/avro.html">Apache Avro</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-core/azure.html">Microsoft Azure</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-core/bloom-filter.html">Bloom Filter</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-core/datasketches-extension.html">DataSketches extension</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-core/datasketches-hll.html">DataSketches HLL Sketch module</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-core/datasketches-quantiles.html">DataSketches Quantiles Sketch module</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-core/datasketches-theta.html">DataSketches Theta Sketch module</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-core/datasketches-tuple.html">DataSketches Tuple Sketch module</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-core/druid-basic-security.html">Basic Security</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-core/druid-kerberos.html">Kerberos</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-core/druid-lookups.html">Cached Lookup Module</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-core/druid-ranger-security.html">Apache Ranger Security</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-core/google.html">Google Cloud Storage</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-core/hdfs.html">HDFS</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-core/kafka-extraction-namespace.html">Apache Kafka Lookups</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-core/lookups-cached-global.html">Globally Cached Lookups</a></li><li 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href="/docs/0.20.0/development/extensions-core/simple-client-sslcontext.html">Simple SSLContext Provider Module</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-core/stats.html">Stats aggregator</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-core/test-stats.html">Test Stats Aggregators</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-contrib/ambari-metrics-emitter.html">Ambari Metrics Emitter</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-contrib/cassandra.html">Apache Cassandra</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-contrib/cloudfiles.html">Rackspace Cloud Files</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-contrib/distinctcount.html">DistinctCount Aggregator</a></li><li class="navListItem"><a class="navItem" 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class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-contrib/gce-extensions.html">GCE Extensions</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-contrib/aliyun-oss.html">Aliyun OSS</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/querying/hll-old.html">Cardinality/HyperUnique aggregators</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/querying/select-query.html">Select</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/ingestion/standalone-realtime.html">Realtime Process</a></li></ul></div></div></section></div><script>
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+<p>Druid include a console for managing datasources, segments, tasks, data processes (Historicals and MiddleManagers), and coordinator dynamic configuration. Users can also run SQL and native Druid queries in the console.</p>
+<p>The Druid Console is hosted by the <a href="/docs/0.20.0/design/router.html">Router</a> process.</p>
+<p>The following cluster settings must be enabled, as they are by default:</p>
+<ul>
+<li>the Router's <a href="../design/router.html#enabling-the-management-proxy">management proxy</a> must be enabled.</li>
+<li>the Broker processes in the cluster must have <a href="/docs/0.20.0/querying/sql.html">Druid SQL</a> enabled.</li>
+</ul>
+<p>The Druid console can be accessed at:</p>
+<pre><code class="hljs">http://<span class="hljs-tag">&lt;<span class="hljs-name">ROUTER_IP</span>&gt;</span>:<span class="hljs-tag">&lt;<span class="hljs-name">ROUTER_PORT</span>&gt;</span>
+</code></pre>
+<blockquote>
+<p>It is important to note that any Druid console user will have, effectively, the same file permissions as the user under which Druid runs. One way these permissions are surfaced is in the file browser dialog. The dialog
+will show console users the files that the underlying user has permissions to. In general, avoid running Druid as
+root user. Consider creating a dedicated user account for running Druid.</p>
+</blockquote>
+<p>Below is a description of the high-level features and functionality of the Druid Console</p>
+<h2><a class="anchor" aria-hidden="true" id="home"></a><a href="#home" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Home</h2>
+<p>The home view provides a high level overview of the cluster.
+Each card is clickable and links to the appropriate view.
+The legacy menu allows you to go to the <a href="./management-uis.html#legacy-consoles">legacy coordinator and overlord consoles</a> should you need them.</p>
+<p><img src="../assets/web-console-01-home-view.png" alt="home-view"></p>
+<h2><a class="anchor" aria-hidden="true" id="data-loader"></a><a href="#data-loader" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Data loader</h2>
+<p>The data loader view allows you to load data by building an ingestion spec with a step-by-step wizard.</p>
+<p><img src="../assets/web-console-02-data-loader-1.png" alt="data-loader-1"></p>
+<p>After selecting the location of your data just follow the series for steps that will show you incremental previews of the data as it will be ingested.
+After filling in the required details on every step you can navigate to the next step by clicking the <code>Next</code> button.
+You can also freely navigate between the steps from the top navigation.</p>
+<p>Navigating with the top navigation will leave the underlying spec unmodified while clicking the <code>Next</code> button will attempt to fill in the subsequent steps with appropriate defaults.</p>
+<p><img src="../assets/web-console-03-data-loader-2.png" alt="data-loader-2"></p>
+<h2><a class="anchor" aria-hidden="true" id="datasources"></a><a href="#datasources" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Datasources</h2>
+<p>The datasources view shows all the currently enabled datasources.
+From this view you can see the sizes and availability of the different datasources.
+You can edit the retention rules, configure automatic compaction, and drop data.
+Like any view that is powered by a DruidSQL query you can click <code>View SQL query for table</code> from the <code>...</code> menu to run the underlying SQL query directly.</p>
+<p><img src="../assets/web-console-04-datasources.png" alt="datasources"></p>
+<p>You can view and edit retention rules to determine the general availability of a datasource.</p>
+<p><img src="../assets/web-console-05-retention.png" alt="retention"></p>
+<h2><a class="anchor" aria-hidden="true" id="segments"></a><a href="#segments" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Segments</h2>
+<p>The segment view shows all the segments in the cluster.
+Each segment can be has a detail view that provides more information.
+The Segment ID is also conveniently broken down into Datasource, Start, End, Version, and Partition columns for ease of filtering and sorting.</p>
+<p><img src="../assets/web-console-06-segments.png" alt="segments"></p>
+<h2><a class="anchor" aria-hidden="true" id="tasks-and-supervisors"></a><a href="#tasks-and-supervisors" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Tasks and supervisors</h2>
+<p>From this view you can check the status of existing supervisors as well as suspend, resume, and reset them.
+The tasks table allows you see the currently running and recently completed tasks.
+To make managing a lot of tasks more accessible, you can group the tasks by their <code>Type</code>, <code>Datasource</code>, or <code>Status</code> to make navigation easier.</p>
+<p><img src="../assets/web-console-07-supervisors.png" alt="supervisors"></p>
+<p>Click on the magnifying glass for any supervisor to see detailed reports of its progress.</p>
+<p><img src="../assets/web-console-08-supervisor-status.png" alt="supervisor-status"></p>
+<p>Click on the magnifying glass for any task to see more detail about it.</p>
+<p><img src="../assets/web-console-09-task-status.png" alt="tasks-status"></p>
+<h2><a class="anchor" aria-hidden="true" id="servers"></a><a href="#servers" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Servers</h2>
+<p>The servers tab lets you see the current status of the nodes making up your cluster.
+You can group the nodes by type or by tier to get meaningful summary statistics.</p>
+<p><img src="../assets/web-console-10-servers.png" alt="servers"></p>
+<h2><a class="anchor" aria-hidden="true" id="query"></a><a href="#query" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Query</h2>
+<p>The query view lets you issue <a href="/docs/0.20.0/querying/sql.html">DruidSQL</a> queries and display the results as a table.
+The view will attempt to infer your query and let you modify via contextual actions such as adding filters and changing the sort order when possible.</p>
+<p><img src="../assets/web-console-11-query-sql.png" alt="query-sql"></p>
+<p>The query view can also issue queries in Druid's <a href="/docs/0.20.0/querying/querying.html">native query format</a>, which is JSON over HTTP.
+To send a native Druid query, you must start your query with <code>{</code> and format it as JSON.</p>
+<p><img src="../assets/web-console-12-query-rune.png" alt="query-rune"></p>
+<h2><a class="anchor" aria-hidden="true" id="lookups"></a><a href="#lookups" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Lookups</h2>
+<p>You can create and edit query time lookups via the lookup view.</p>
+<p><img src="../assets/web-console-13-lookups.png" alt="lookups"></p>
+</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/0.20.0/configuration/logging.html"><span class="arrow-prev">← </span><span>Logging</span></a><a class="docs-next button" href="/docs/0.20.0/operations/getting-started.html"><span>Getting started with Apache Druid</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#home">Home</a></li><li><a href="#data-loader">Data loader</a></li><li><a href="#datasources">Datasources</a></li><li><a href="#segments">Segments</a></li><li><a href="#tasks-and-supervisors">Tasks and supervisors</a></li><li><a href="#servers">Servers</a></li><li><a href="#query">Query</a></li><li><a href="#lookups">Lookups</a></li></ul></nav></div><footer class="nav-footer druid-footer" id="footer"><div class="container"><div class="text-center"><p><a href="/technology">Technology</a> · <a href="/use-cases">Use Cases</a> · <a href="/druid-powered">Powered by Druid</a> · <a href="/docs/0.20.0/latest">Docs</a> · <a href="/community/">Community</a> · <a href="/downloads.html">Download</a> · <a href="/faq">FAQ</a></p></div><div class="text-center"><a title="Join the user group" href="https://groups.google.com/forum/#!forum/druid-user" target="_blank"><span class="fa fa-comments"></span></a> · <a title="Follow Druid" href="https://twitter.com/druidio" target="_blank"><span class="fab fa-twitter"></span></a> · <a title="Download via Apache" href="https://www.apache.org/dyn/closer.cgi?path=/incubator/druid/{{ site.druid_versions[0].versions[0].version }}/apache-druid-{{ site.druid_versions[0].versions[0].version }}-bin.tar.gz" target="_blank"><span class="fas fa-feather"></span></a> · <a title="GitHub" href="https://github.com/apache/druid" target="_blank"><span class="fab fa-github"></span></a></div><div class="text-center license">Copyright © 2019 <a href="https://www.apache.org/" target="_blank">Apache Software Foundation</a>.<br/>Except where otherwise noted, licensed under <a rel="license" href="http://creativecommons.org/licenses/by-sa/4.0/">CC BY-SA 4.0</a>.<br/>Apache Druid, Druid, and the Druid logo are either registered trademarks or trademarks of The Apache Software Foundation in the United States and other countries.</div></div></footer></div><script type="text/javascript" src="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.js"></script><script>
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+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>dump-segment tool · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/0.20.0/operations/dump-segment.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.20.0" /><meta property="og:title" content="dump-segment tool · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
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+        </script></nav></div><div class="container mainContainer docsContainer"><div class="wrapper"><div class="post"><header class="postHeader"><a class="edit-page-link button" href="https://github.com/apache/druid/edit/master/docs/operations/dump-segment.md" target="_blank" rel="noreferrer noopener">Edit</a><h1 id="__docusaurus" class="postHeaderTitle">dump-segment tool</h1></header><article><div><span><!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+  -->
+<p>The DumpSegment tool can be used to dump the metadata or contents of an Apache Druid segment for debugging purposes. Note that the
+dump is not necessarily a full-fidelity translation of the segment. In particular, not all metadata is included, and
+complex metric values may not be complete.</p>
+<p>To run the tool, point it at a segment directory and provide a file for writing output:</p>
+<pre><code class="hljs">java -classpath <span class="hljs-string">"/my/druid/lib/*"</span> -Ddruid<span class="hljs-selector-class">.extensions</span>.loadList=<span class="hljs-string">"[]"</span> org<span class="hljs-selector-class">.apache</span><span class="hljs-selector-class">.druid</span><span class="hljs-selector-class">.cli</span><span class="hljs-selector-class">.Main</span> \
+  tools dump-segment \
+  --directory /home/druid/path/to/segment/ \
+  --out /home/druid/output<span class="hljs-selector-class">.txt</span>
+</code></pre>
+<h3><a class="anchor" aria-hidden="true" id="output-format"></a><a href="#output-format" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Output format</h3>
+<h4><a class="anchor" aria-hidden="true" id="data-dumps"></a><a href="#data-dumps" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Data dumps</h4>
+<p>By default, or with <code>--dump rows</code>, this tool dumps rows of the segment as newline-separate JSON objects, with one
+object per line, using the default serialization for each column. Normally all columns are included, but if you like,
+you can limit the dump to specific columns with <code>--column name</code>.</p>
+<p>For example, one line might look like this when pretty-printed:</p>
+<pre><code class="hljs">{
+  <span class="hljs-attr">"__time"</span>: <span class="hljs-number">1442018818771</span>,
+  <span class="hljs-attr">"added"</span>: <span class="hljs-number">36</span>,
+  <span class="hljs-attr">"channel"</span>: <span class="hljs-string">"#en.wikipedia"</span>,
+  <span class="hljs-attr">"cityName"</span>: <span class="hljs-literal">null</span>,
+  <span class="hljs-attr">"comment"</span>: <span class="hljs-string">"added project"</span>,
+  <span class="hljs-attr">"count"</span>: <span class="hljs-number">1</span>,
+  <span class="hljs-attr">"countryIsoCode"</span>: <span class="hljs-literal">null</span>,
+  <span class="hljs-attr">"countryName"</span>: <span class="hljs-literal">null</span>,
+  <span class="hljs-attr">"deleted"</span>: <span class="hljs-number">0</span>,
+  <span class="hljs-attr">"delta"</span>: <span class="hljs-number">36</span>,
+  <span class="hljs-attr">"isAnonymous"</span>: <span class="hljs-string">"false"</span>,
+  <span class="hljs-attr">"isMinor"</span>: <span class="hljs-string">"false"</span>,
+  <span class="hljs-attr">"isNew"</span>: <span class="hljs-string">"false"</span>,
+  <span class="hljs-attr">"isRobot"</span>: <span class="hljs-string">"false"</span>,
+  <span class="hljs-attr">"isUnpatrolled"</span>: <span class="hljs-string">"false"</span>,
+  <span class="hljs-attr">"iuser"</span>: <span class="hljs-string">"00001553"</span>,
+  <span class="hljs-attr">"metroCode"</span>: <span class="hljs-literal">null</span>,
+  <span class="hljs-attr">"namespace"</span>: <span class="hljs-string">"Talk"</span>,
+  <span class="hljs-attr">"page"</span>: <span class="hljs-string">"Talk:Oswald Tilghman"</span>,
+  <span class="hljs-attr">"regionIsoCode"</span>: <span class="hljs-literal">null</span>,
+  <span class="hljs-attr">"regionName"</span>: <span class="hljs-literal">null</span>,
+  <span class="hljs-attr">"user"</span>: <span class="hljs-string">"GELongstreet"</span>
+}
+</code></pre>
+<h4><a class="anchor" aria-hidden="true" id="metadata-dumps"></a><a href="#metadata-dumps" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Metadata dumps</h4>
+<p>With <code>--dump metadata</code>, this tool dumps metadata instead of rows. Metadata dumps generated by this tool are in the same
+format as returned by the <a href="/docs/0.20.0/querying/segmentmetadataquery.html">SegmentMetadata query</a>.</p>
+<h4><a class="anchor" aria-hidden="true" id="bitmap-dumps"></a><a href="#bitmap-dumps" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Bitmap dumps</h4>
+<p>With <code>--dump bitmaps</code>, this tool dump bitmap indexes instead of rows. Bitmap dumps generated by this tool include
+dictionary-encoded string columns only. The output contains a field &quot;bitmapSerdeFactory&quot; describing the type of bitmaps
+used in the segment, and a field &quot;bitmaps&quot; containing the bitmaps for each value of each column. These are base64
+encoded by default, but you can also dump them as lists of row numbers with <code>--decompress-bitmaps</code>.</p>
+<p>Normally all columns are included, but if you like, you can limit the dump to specific columns with <code>--column name</code>.</p>
+<p>Sample output:</p>
+<pre><code class="hljs">{
+  <span class="hljs-attr">"bitmapSerdeFactory"</span>: {
+    <span class="hljs-attr">"type"</span>: <span class="hljs-string">"roaring"</span>,
+    <span class="hljs-attr">"compressRunOnSerialization"</span>: <span class="hljs-literal">true</span>
+  },
+  <span class="hljs-attr">"bitmaps"</span>: {
+    <span class="hljs-attr">"isRobot"</span>: {
+      <span class="hljs-attr">"false"</span>: <span class="hljs-string">"//aExfu+Nv3X..."</span>,
+      <span class="hljs-attr">"true"</span>: <span class="hljs-string">"gAl7OoRByQ..."</span>
+    }
+  }
+}
+</code></pre>
+<h3><a class="anchor" aria-hidden="true" id="command-line-arguments"></a><a href="#command-line-arguments" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Command line arguments</h3>
+<table>
+<thead>
+<tr><th>argument</th><th>description</th><th>required?</th></tr>
+</thead>
+<tbody>
+<tr><td>--directory file</td><td>Directory containing segment data. This could be generated by unzipping an &quot;index.zip&quot; from deep storage.</td><td>yes</td></tr>
+<tr><td>--output file</td><td>File to write to, or omit to write to stdout.</td><td>yes</td></tr>
+<tr><td>--dump TYPE</td><td>Dump either 'rows' (default), 'metadata', or 'bitmaps'</td><td>no</td></tr>
+<tr><td>--column columnName</td><td>Column to include. Specify multiple times for multiple columns, or omit to include all columns.</td><td>no</td></tr>
+<tr><td>--filter json</td><td>JSON-encoded <a href="/docs/0.20.0/querying/filters.html">query filter</a>. Omit to include all rows. Only used if dumping rows.</td><td>no</td></tr>
+<tr><td>--time-iso8601</td><td>Format __time column in ISO8601 format rather than long. Only used if dumping rows.</td><td>no</td></tr>
+<tr><td>--decompress-bitmaps</td><td>Dump bitmaps as arrays rather than base64-encoded compressed bitmaps. Only used if dumping bitmaps.</td><td>no</td></tr>
+</tbody>
+</table>
+</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/0.20.0/operations/password-provider.html"><span class="arrow-prev">← </span><span>Password providers</span></a><a class="docs-next button" href="/docs/0.20.0/operations/reset-cluster.html"><span>reset-cluster tool</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"></nav></div><footer class="nav-footer druid-footer" id="footer"><div class="container"><div class="text-center"><p><a href="/technology">Technology</a> · <a href="/use-cases">Use Cases</a> · <a href="/druid-powered">Powered by Druid</a> · <a href="/docs/0.20.0/latest">Docs</a> · <a href="/community/">Community</a> · <a href="/downloads.html">Download</a> · <a href="/faq">FAQ</a></p></div><div class="text-center"><a title="Join the user group" href="https://groups.google.com/forum/#!forum/druid-user" target="_blank"><span class="fa fa-comments"></span></a> · <a title="Follow Druid" href="https://twitter.com/druidio" target="_blank"><span class="fab fa-twitter"></span></a> · <a title="Download via Apache" href="https://www.apache.org/dyn/closer.cgi?path=/incubator/druid/{{ site.druid_versions[0].versions[0].version }}/apache-druid-{{ site.druid_versions[0].versions[0].version }}-bin.tar.gz" target="_blank"><span class="fas fa-feather"></span></a> · <a title="GitHub" href="https://github.com/apache/druid" target="_blank"><span class="fab fa-github"></span></a></div><div class="text-center license">Copyright © 2019 <a href="https://www.apache.org/" target="_blank">Apache Software Foundation</a>.<br/>Except where otherwise noted, licensed under <a rel="license" href="http://creativecommons.org/licenses/by-sa/4.0/">CC BY-SA 4.0</a>.<br/>Apache Druid, Druid, and the Druid logo are either registered trademarks or trademarks of The Apache Software Foundation in the United States and other countries.</div></div></footer></div><script type="text/javascript" src="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.js"></script><script>
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diff --git a/docs/0.20.0/operations/export-metadata.html b/docs/0.20.0/operations/export-metadata.html
new file mode 100644
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--- /dev/null
+++ b/docs/0.20.0/operations/export-metadata.html
@@ -0,0 +1,223 @@
+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Export Metadata Tool · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/0.20.0/operations/export-metadata.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.20.0" /><meta property="og:title" content="Export Metadata Tool · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
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+        </script></nav></div><div class="container mainContainer docsContainer"><div class="wrapper"><div class="post"><header class="postHeader"><a class="edit-page-link button" href="https://github.com/apache/druid/edit/master/docs/operations/export-metadata.md" target="_blank" rel="noreferrer noopener">Edit</a><h1 id="__docusaurus" class="postHeaderTitle">Export Metadata Tool</h1></header><article><div><span><!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+  -->
+<p>Druid includes an <code>export-metadata</code> tool for assisting with migration of cluster metadata and deep storage.</p>
+<p>This tool exports the contents of the following Druid metadata tables:</p>
+<ul>
+<li>segments</li>
+<li>rules</li>
+<li>config</li>
+<li>datasource</li>
+<li>supervisors</li>
+</ul>
+<p>Additionally, the tool can rewrite the local deep storage location descriptors in the rows of the segments table
+to point to new deep storage locations (S3, HDFS, and local rewrite paths are supported).</p>
+<p>The tool has the following limitations:</p>
+<ul>
+<li>Only exporting from Derby metadata is currently supported</li>
+<li>If rewriting load specs for deep storage migration, only migrating from local deep storage is currently supported.</li>
+</ul>
+<h2><a class="anchor" aria-hidden="true" id="export-metadata-options"></a><a href="#export-metadata-options" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a><code>export-metadata</code> Options</h2>
+<p>The <code>export-metadata</code> tool provides the following options:</p>
+<h3><a class="anchor" aria-hidden="true" id="connection-properties"></a><a href="#connection-properties" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Connection Properties</h3>
+<ul>
+<li><code>--connectURI</code>: The URI of the Derby database, e.g. <code>jdbc:derby://localhost:1527/var/druid/metadata.db;create=true</code></li>
+<li><code>--user</code>: Username</li>
+<li><code>--password</code>: Password</li>
+<li><code>--base</code>: corresponds to the value of <code>druid.metadata.storage.tables.base</code> in the configuration, <code>druid</code> by default.</li>
+</ul>
+<h3><a class="anchor" aria-hidden="true" id="output-path"></a><a href="#output-path" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Output Path</h3>
+<ul>
+<li><code>--output-path</code>, <code>-o</code>: The output directory of the tool. CSV files for the Druid segments, rules, config, datasource, and supervisors tables will be written to this directory.</li>
+</ul>
+<h3><a class="anchor" aria-hidden="true" id="export-format-options"></a><a href="#export-format-options" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Export Format Options</h3>
+<ul>
+<li><code>--use-hex-blobs</code>, <code>-x</code>: If set, export BLOB payload columns as hexadecimal strings. This needs to be set if importing back into Derby. Default is false.</li>
+<li><code>--booleans-as-strings</code>, <code>-t</code>: If set, write boolean values as &quot;true&quot; or &quot;false&quot; instead of &quot;1&quot; and &quot;0&quot;. This needs to be set if importing back into Derby. Default is false.</li>
+</ul>
+<h3><a class="anchor" aria-hidden="true" id="deep-storage-migration"></a><a href="#deep-storage-migration" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Deep Storage Migration</h3>
+<h4><a class="anchor" aria-hidden="true" id="migration-to-s3-deep-storage"></a><a href="#migration-to-s3-deep-storage" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Migration to S3 Deep Storage</h4>
+<p>By setting the options below, the tool will rewrite the segment load specs to point to a new S3 deep storage location.</p>
+<p>This helps users migrate segments stored in local deep storage to S3.</p>
+<ul>
+<li><code>--s3bucket</code>, <code>-b</code>: The S3 bucket that will hold the migrated segments</li>
+<li><code>--s3baseKey</code>, <code>-k</code>: The base S3 key where the migrated segments will be stored</li>
+</ul>
+<p>When copying the local deep storage segments to S3, the rewrite performed by this tool requires that the directory structure of the segments be unchanged.</p>
+<p>For example, if the cluster had the following local deep storage configuration:</p>
+<pre><code class="hljs"><span class="hljs-attr">druid.storage.type</span>=local
+<span class="hljs-attr">druid.storage.storageDirectory</span>=/druid/segments
+</code></pre>
+<p>If the target S3 bucket was <code>migration</code>, with a base key of <code>example</code>, the contents of <code>s3://migration/example/</code> must be identical to that of <code>/druid/segments</code> on the old local filesystem.</p>
+<h4><a class="anchor" aria-hidden="true" id="migration-to-hdfs-deep-storage"></a><a href="#migration-to-hdfs-deep-storage" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Migration to HDFS Deep Storage</h4>
+<p>By setting the options below, the tool will rewrite the segment load specs to point to a new HDFS deep storage location.</p>
+<p>This helps users migrate segments stored in local deep storage to HDFS.</p>
+<p><code>--hadoopStorageDirectory</code>, <code>-h</code>: The HDFS path that will hold the migrated segments</p>
+<p>When copying the local deep storage segments to HDFS, the rewrite performed by this tool requires that the directory structure of the segments be unchanged, with the exception of directory names containing colons (<code>:</code>).</p>
+<p>For example, if the cluster had the following local deep storage configuration:</p>
+<pre><code class="hljs"><span class="hljs-attr">druid.storage.type</span>=local
+<span class="hljs-attr">druid.storage.storageDirectory</span>=/druid/segments
+</code></pre>
+<p>If the target hadoopStorageDirectory was <code>/migration/example</code>, the contents of <code>hdfs:///migration/example/</code> must be identical to that of <code>/druid/segments</code> on the old local filesystem.</p>
+<p>Additionally, the segments paths in local deep storage contain colons(<code>:</code>) in their names, e.g.:</p>
+<p><code>wikipedia/2016-06-27T02:00:00.000Z_2016-06-27T03:00:00.000Z/2019-05-03T21:57:15.950Z/1/index.zip</code></p>
+<p>HDFS cannot store files containing colons, and this tool expects the colons to be replaced with underscores (<code>_</code>) in HDFS.</p>
+<p>In this example, the <code>wikipedia</code> segment above under <code>/druid/segments</code> in local deep storage would need to be migrated to HDFS under <code>hdfs:///migration/example/</code> with the following path:</p>
+<p><code>wikipedia/2016-06-27T02_00_00.000Z_2016-06-27T03_00_00.000Z/2019-05-03T21_57_15.950Z/1/index.zip</code></p>
+<h4><a class="anchor" aria-hidden="true" id="migration-to-new-local-deep-storage-path"></a><a href="#migration-to-new-local-deep-storage-path" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Migration to New Local Deep Storage Path</h4>
+<p>By setting the options below, the tool will rewrite the segment load specs to point to a new local deep storage location.</p>
+<p>This helps users migrate segments stored in local deep storage to a new path (e.g., a new NFS mount).</p>
+<p><code>--newLocalPath</code>, <code>-n</code>: The new path on the local filesystem that will hold the migrated segments</p>
+<p>When copying the local deep storage segments to a new path, the rewrite performed by this tool requires that the directory structure of the segments be unchanged.</p>
+<p>For example, if the cluster had the following local deep storage configuration:</p>
+<pre><code class="hljs"><span class="hljs-attr">druid.storage.type</span>=local
+<span class="hljs-attr">druid.storage.storageDirectory</span>=/druid/segments
+</code></pre>
+<p>If the new path  was <code>/migration/example</code>, the contents of <code>/migration/example/</code> must be identical to that of <code>/druid/segments</code> on the local filesystem.</p>
+<h2><a class="anchor" aria-hidden="true" id="running-the-tool"></a><a href="#running-the-tool" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Running the tool</h2>
+<p>To use the tool, you can run the following from the root of the Druid package:</p>
+<pre><code class="hljs css language-bash"><span class="hljs-built_in">cd</span> <span class="hljs-variable">${DRUID_ROOT}</span>
+mkdir -p /tmp/csv
+java -classpath <span class="hljs-string">"lib/*"</span> -Dlog4j.configurationFile=conf/druid/cluster/_common/log4j2.xml -Ddruid.extensions.directory=<span class="hljs-string">"extensions"</span> -Ddruid.extensions.loadList=[] org.apache.druid.cli.Main tools <span class="hljs-built_in">export</span>-metadata --connectURI <span class="hljs-string">"jdbc:derby://localhost:1527/var/druid/metadata.db;"</span> -o /tmp/csv
+</code></pre>
+<p>In the example command above:</p>
+<ul>
+<li><code>lib</code> is the Druid lib directory</li>
+<li><code>extensions</code> is the Druid extensions directory</li>
+<li><code>/tmp/csv</code> is the output directory. Please make sure that this directory exists.</li>
+</ul>
+<h2><a class="anchor" aria-hidden="true" id="importing-metadata"></a><a href="#importing-metadata" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Importing Metadata</h2>
+<p>After running the tool, the output directory will contain <code>&lt;table-name&gt;_raw.csv</code> and <code>&lt;table-name&gt;.csv</code> files.</p>
+<p>The <code>&lt;table-name&gt;_raw.csv</code> files are intermediate files used by the tool, containing the table data as exported by Derby without modification.</p>
+<p>The <code>&lt;table-name&gt;.csv</code> files are used for import into another database such as MySQL and PostgreSQL and have any configured deep storage location rewrites applied.</p>
+<p>Example import commands for Derby, MySQL, and PostgreSQL are shown below.</p>
+<p>These example import commands expect <code>/tmp/csv</code> and its contents to be accessible from the server. For other options, such as importing from the client filesystem, please refer to the database's documentation.</p>
+<h3><a class="anchor" aria-hidden="true" id="derby"></a><a href="#derby" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Derby</h3>
+<pre><code class="hljs css language-sql"><span class="hljs-keyword">CALL</span> SYSCS_UTIL.SYSCS_IMPORT_TABLE (<span class="hljs-literal">null</span>,<span class="hljs-string">'DRUID_SEGMENTS'</span>,<span class="hljs-string">'/tmp/csv/druid_segments.csv'</span>,<span class="hljs-string">','</span>,<span class="hljs-string">'"'</span>,<span class="hljs-literal">null</span>,<span class="hljs-number">0</span>);
+
+<span class="hljs-keyword">CALL</span> SYSCS_UTIL.SYSCS_IMPORT_TABLE (<span class="hljs-literal">null</span>,<span class="hljs-string">'DRUID_RULES'</span>,<span class="hljs-string">'/tmp/csv/druid_rules.csv'</span>,<span class="hljs-string">','</span>,<span class="hljs-string">'"'</span>,<span class="hljs-literal">null</span>,<span class="hljs-number">0</span>);
+
+<span class="hljs-keyword">CALL</span> SYSCS_UTIL.SYSCS_IMPORT_TABLE (<span class="hljs-literal">null</span>,<span class="hljs-string">'DRUID_CONFIG'</span>,<span class="hljs-string">'/tmp/csv/druid_config.csv'</span>,<span class="hljs-string">','</span>,<span class="hljs-string">'"'</span>,<span class="hljs-literal">null</span>,<span class="hljs-number">0</span>);
+
+<span class="hljs-keyword">CALL</span> SYSCS_UTIL.SYSCS_IMPORT_TABLE (<span class="hljs-literal">null</span>,<span class="hljs-string">'DRUID_DATASOURCE'</span>,<span class="hljs-string">'/tmp/csv/druid_dataSource.csv'</span>,<span class="hljs-string">','</span>,<span class="hljs-string">'"'</span>,<span class="hljs-literal">null</span>,<span class="hljs-number">0</span>);
+
+<span class="hljs-keyword">CALL</span> SYSCS_UTIL.SYSCS_IMPORT_TABLE (<span class="hljs-literal">null</span>,<span class="hljs-string">'DRUID_SUPERVISORS'</span>,<span class="hljs-string">'/tmp/csv/druid_supervisors.csv'</span>,<span class="hljs-string">','</span>,<span class="hljs-string">'"'</span>,<span class="hljs-literal">null</span>,<span class="hljs-number">0</span>);
+</code></pre>
+<h3><a class="anchor" aria-hidden="true" id="mysql"></a><a href="#mysql" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>MySQL</h3>
+<pre><code class="hljs css language-sql"><span class="hljs-keyword">LOAD</span> <span class="hljs-keyword">DATA</span> <span class="hljs-keyword">INFILE</span> <span class="hljs-string">'/tmp/csv/druid_segments.csv'</span> <span class="hljs-keyword">INTO</span> <span class="hljs-keyword">TABLE</span> druid_segments <span class="hljs-keyword">FIELDS</span> <span class="hljs-keyword">TERMINATED</span> <span class="hljs-keyword">BY</span> <span class="hljs-string">','</span> <span class="hljs-keyword">OPTIONALLY</span> <span class="hljs-keyword">ENCLOSED</span> <span class="hljs-keyword">BY</span> <span class="hljs-string">'\"'</span> (<span class="hljs-keyword">id</span>,dataSource,created_date,<span class="hljs-keyword">start</span>,<span class="hljs-keyword">end</span>,partitioned,<span class="hljs-keyword">version</span>,used,payload); <span class="hljs-keyword">SHOW</span> <span class="hljs-keyword">WARNINGS</span>;
+
+<span class="hljs-keyword">LOAD</span> <span class="hljs-keyword">DATA</span> <span class="hljs-keyword">INFILE</span> <span class="hljs-string">'/tmp/csv/druid_rules.csv'</span> <span class="hljs-keyword">INTO</span> <span class="hljs-keyword">TABLE</span> druid_rules <span class="hljs-keyword">FIELDS</span> <span class="hljs-keyword">TERMINATED</span> <span class="hljs-keyword">BY</span> <span class="hljs-string">','</span> <span class="hljs-keyword">OPTIONALLY</span> <span class="hljs-keyword">ENCLOSED</span> <span class="hljs-keyword">BY</span> <span class="hljs-string">'\"'</span> (<span class="hljs-keyword">id</span>,dataSource,<span class="hljs-keyword">version</span>,payload); <span class="hljs-keyword">SHOW</span> <span class="hljs-keyword">WARNINGS</span>;
+
+<span class="hljs-keyword">LOAD</span> <span class="hljs-keyword">DATA</span> <span class="hljs-keyword">INFILE</span> <span class="hljs-string">'/tmp/csv/druid_config.csv'</span> <span class="hljs-keyword">INTO</span> <span class="hljs-keyword">TABLE</span> druid_config <span class="hljs-keyword">FIELDS</span> <span class="hljs-keyword">TERMINATED</span> <span class="hljs-keyword">BY</span> <span class="hljs-string">','</span> <span class="hljs-keyword">OPTIONALLY</span> <span class="hljs-keyword">ENCLOSED</span> <span class="hljs-keyword">BY</span> <span class="hljs-string">'\"'</span> (<span class="hljs-keyword">name</span>,payload); <span class="hljs-keyword">SHOW</span> <span class="hljs-keyword">WARNINGS</span>;
+
+<span class="hljs-keyword">LOAD</span> <span class="hljs-keyword">DATA</span> <span class="hljs-keyword">INFILE</span> <span class="hljs-string">'/tmp/csv/druid_dataSource.csv'</span> <span class="hljs-keyword">INTO</span> <span class="hljs-keyword">TABLE</span> druid_dataSource <span class="hljs-keyword">FIELDS</span> <span class="hljs-keyword">TERMINATED</span> <span class="hljs-keyword">BY</span> <span class="hljs-string">','</span> <span class="hljs-keyword">OPTIONALLY</span> <span class="hljs-keyword">ENCLOSED</span> <span class="hljs-keyword">BY</span> <span class="hljs-string">'\"'</span> (dataSource,created_date,commit_metadata_payload,commit_metadata_sha1); <span class="hljs-keyword">SHOW</span> <span class="hljs-keyword">WARNINGS</span>;
+
+<span class="hljs-keyword">LOAD</span> <span class="hljs-keyword">DATA</span> <span class="hljs-keyword">INFILE</span> <span class="hljs-string">'/tmp/csv/druid_supervisors.csv'</span> <span class="hljs-keyword">INTO</span> <span class="hljs-keyword">TABLE</span> druid_supervisors <span class="hljs-keyword">FIELDS</span> <span class="hljs-keyword">TERMINATED</span> <span class="hljs-keyword">BY</span> <span class="hljs-string">','</span> <span class="hljs-keyword">OPTIONALLY</span> <span class="hljs-keyword">ENCLOSED</span> <span class="hljs-keyword">BY</span> <span class="hljs-string">'\"'</span> (<span class="hljs-keyword">id</span>,spec_id,created_date,payload); <span class="hljs-keyword">SHOW</span> <span class="hljs-keyword">WARNINGS</span>;
+</code></pre>
+<h3><a class="anchor" aria-hidden="true" id="postgresql"></a><a href="#postgresql" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>PostgreSQL</h3>
+<pre><code class="hljs css language-sql">COPY druid_segments(id,dataSource,created_date,<span class="hljs-keyword">start</span>,<span class="hljs-string">"end"</span>,partitioned,<span class="hljs-keyword">version</span>,used,payload) <span class="hljs-keyword">FROM</span> <span class="hljs-string">'/tmp/csv/druid_segments.csv'</span> DELIMITER <span class="hljs-string">','</span> CSV;
+
+COPY druid_rules(id,dataSource,version,payload) FROM '/tmp/csv/druid_rules.csv' DELIMITER ',' CSV;
+
+COPY druid_config(name,payload) FROM '/tmp/csv/druid_config.csv' DELIMITER ',' CSV;
+
+COPY druid_dataSource(dataSource,created_date,commit_metadata_payload,commit_metadata_sha1) FROM '/tmp/csv/druid_dataSource.csv' DELIMITER ',' CSV;
+
+COPY druid_supervisors(id,spec_id,created_date,payload) FROM '/tmp/csv/druid_supervisors.csv' DELIMITER ',' CSV;
+</code></pre>
+</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/0.20.0/operations/deep-storage-migration.html"><span class="arrow-prev">← </span><span>Deep storage migration</span></a><a class="docs-next button" href="/docs/0.20.0/operations/metadata-migration.html"><span>Metadata Migration</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#export-metadata-options"><code>export-metadata</code> Options</a><ul class="toc-headings"><li><a href="#connection-properties">Connection Properties</a></li><li><a href="#output-path">Output Path</a></li><li><a href="#export-format-options">Export Format Options</a></li><li><a href="#deep-storage-migration">Deep Storage Migration</a></li></ul></li><li><a href="#running-the-tool">Running the tool</a></li><li><a href="#importing-metadata">Importing Metadata</a><ul class="toc-headings"><li><a href="#derby">Derby</a></li><li><a href="#mysql">MySQL</a></li><li><a href="#postgresql">PostgreSQL</a></li></ul></li></ul></nav></div><footer class="nav-footer druid-footer" id="footer"><div class="container"><div class="text-center"><p><a href="/technology">Technology</a> · <a href="/use-cases">Use Cases</a> · <a href="/druid-powered">Powered by Druid</a> · <a href="/docs/0.20.0/latest">Docs</a> · <a href="/community/">Community</a> · <a href="/downloads.html">Download</a> · <a href="/faq">FAQ</a></p></div><div class="text-center"><a title="Join the user group" href="https://groups.google.com/forum/#!forum/druid-user" target="_blank"><span class="fa fa-comments"></span></a> · <a title="Follow Druid" href="https://twitter.com/druidio" target="_blank"><span class="fab fa-twitter"></span></a> · <a title="Download via Apache" href="https://www.apache.org/dyn/closer.cgi?path=/incubator/druid/{{ site.druid_versions[0].versions[0].version }}/apache-druid-{{ site.druid_versions[0].versions[0].version }}-bin.tar.gz" target="_blank"><span class="fas fa-feather"></span></a> · <a title="GitHub" href="https://github.com/apache/druid" target="_blank"><span class="fab fa-github"></span></a></div><div class="text-center license">Copyright © 2019 <a href="https://www.apache.org/" target="_blank">Apache Software Foundation</a>.<br/>Except where otherwise noted, licensed under <a rel="license" href="http://creativecommons.org/licenses/by-sa/4.0/">CC BY-SA 4.0</a>.<br/>Apache Druid, Druid, and the Druid logo are either registered trademarks or trademarks of The Apache Software Foundation in the United States and other countries.</div></div></footer></div><script type="text/javascript" src="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.js"></script><script>
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+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Getting started with Apache Druid · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/0.20.0/operations/getting-started.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.20.0" /><meta property="og:title" content="Getting started with Apache Druid · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
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collapsible">Tutorials<span class="arrow"><svg width="24" height="24" viewBox="0 0 24 24"><path fill="#565656" d="M7.41 15.41L12 10.83l4.59 4.58L18 14l-6-6-6 6z"></path><path d="M0 0h24v24H0z" fill="none"></path></svg></span></h3><ul class="hide"><li class="navListItem"><a class="navItem" href="/docs/0.20.0/tutorials/tutorial-batch.html">Loading files natively</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/tutorials/tutorial-kafka.html">Load from Apache Kafka</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/tutorials/tutorial-batch-hadoop.html">Load from Apache Hadoop</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/tutorials/tutorial-query.html">Querying data</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/tutorials/tutorial-rollup.html">Roll-up</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/tutorials/tutorial-retention.html">Configuring data retention</a></li><li 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+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+  -->
+<h2><a class="anchor" aria-hidden="true" id="overview"></a><a href="#overview" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Overview</h2>
+<p>If you are new to Druid, we recommend reading the <a href="/docs/0.20.0/design/index.html">Design Overview</a> and the <a href="/docs/0.20.0/ingestion/index.html">Ingestion Overview</a> first for a basic understanding of Druid.</p>
+<h2><a class="anchor" aria-hidden="true" id="single-server-quickstart-and-tutorials"></a><a href="#single-server-quickstart-and-tutorials" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Single-server Quickstart and Tutorials</h2>
+<p>To get started with running Druid, the simplest and quickest way is to try the <a href="/docs/0.20.0/tutorials/index.html">single-server quickstart and tutorials</a>.</p>
+<h2><a class="anchor" aria-hidden="true" id="deploying-a-druid-cluster"></a><a href="#deploying-a-druid-cluster" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Deploying a Druid cluster</h2>
+<p>If you wish to jump straight to deploying Druid as a cluster, or if you have an existing single-server deployment that you wish to migrate to a clustered deployment, please see the <a href="/docs/0.20.0/tutorials/cluster.html">Clustered Deployment Guide</a>.</p>
+<h2><a class="anchor" aria-hidden="true" id="operating-druid"></a><a href="#operating-druid" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Operating Druid</h2>
+<p>The <a href="/docs/0.20.0/configuration/index.html">configuration reference</a> describes all of Druid's configuration properties.</p>
+<p>The <a href="/docs/0.20.0/operations/api-reference.html">API reference</a> describes the APIs available on each Druid process.</p>
+<p>The <a href="/docs/0.20.0/operations/basic-cluster-tuning.html">basic cluster tuning guide</a> is an introductory guide for tuning your Druid cluster.</p>
+<h2><a class="anchor" aria-hidden="true" id="need-help-with-druid"></a><a href="#need-help-with-druid" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Need help with Druid?</h2>
+<p>If you have questions about using Druid, please reach out to the <a href="https://druid.apache.org/community/">Druid user mailing list or other community channels</a>!</p>
+</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/0.20.0/operations/druid-console.html"><span class="arrow-prev">← </span><span>Web console</span></a><a class="docs-next button" href="/docs/0.20.0/operations/basic-cluster-tuning.html"><span>Basic cluster tuning</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#overview">Overview</a></li><li><a href="#single-server-quickstart-and-tutorials">Single-server Quickstart and Tutorials</a></li><li><a href="#deploying-a-druid-cluster">Deploying a Druid cluster</a></li><li><a href="#operating-druid">Operating Druid</a></li><li><a href="#need-help-with-druid">Need help with Druid?</a></li></ul></nav></div><footer class="nav-footer druid-footer" id="footer"><div class="container"><div class="text-center"><p><a href="/technology">Technology</a> · <a href="/use-cases">Use Cases</a> · <a href="/druid-powered">Powered by Druid</a> · <a href="/docs/0.20.0/latest">Docs</a> · <a href="/community/">Community</a> · <a href="/downloads.html">Download</a> · <a href="/faq">FAQ</a></p></div><div class="text-center"><a title="Join the user group" href="https://groups.google.com/forum/#!forum/druid-user" target="_blank"><span class="fa fa-comments"></span></a> · <a title="Follow Druid" href="https://twitter.com/druidio" target="_blank"><span class="fab fa-twitter"></span></a> · <a title="Download via Apache" href="https://www.apache.org/dyn/closer.cgi?path=/incubator/druid/{{ site.druid_versions[0].versions[0].version }}/apache-druid-{{ site.druid_versions[0].versions[0].version }}-bin.tar.gz" target="_blank"><span class="fas fa-feather"></span></a> · <a title="GitHub" href="https://github.com/apache/druid" target="_blank"><span class="fab fa-github"></span></a></div><div class="text-center license">Copyright © 2019 <a href="https://www.apache.org/" target="_blank">Apache Software Foundation</a>.<br/>Except where otherwise noted, licensed under <a rel="license" href="http://creativecommons.org/licenses/by-sa/4.0/">CC BY-SA 4.0</a>.<br/>Apache Druid, Druid, and the Druid logo are either registered trademarks or trademarks of The Apache Software Foundation in the United States and other countries.</div></div></footer></div><script type="text/javascript" src="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.js"></script><script>
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+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>High availability · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/0.20.0/operations/high-availability.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.20.0" /><meta property="og:title" content="High availability · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
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class="icon-toc"></i></div></div><div class="navGroups"><div class="navGroup"><h3 class="navGroupCategoryTitle collapsible">Getting started<span class="arrow"><svg width="24" height="24" viewBox="0 0 24 24"><path fill="#565656" d="M7.41 15.41L12 10.83l4.59 4.58L18 14l-6-6-6 6z"></path><path d="M0 0h24v24H0z" fill="none"></path></svg></span></h3><ul class="hide"><li class="navListItem"><a class="navItem" href="/docs/0.20.0/design/index.html">Introduction to Apache Druid</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/tutorials/index.html">Quickstart</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/tutorials/docker.html">Docker</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/operations/single-server.html">Single server deployment</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/tutorials/cluster.html">Clustered deployment</a></li></ul></div><div class="navGroup"><h3 class="navGroupCategoryTitle 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+        </script></nav></div><div class="container mainContainer docsContainer"><div class="wrapper"><div class="post"><header class="postHeader"><a class="edit-page-link button" href="https://github.com/apache/druid/edit/master/docs/operations/high-availability.md" target="_blank" rel="noreferrer noopener">Edit</a><h1 id="__docusaurus" class="postHeaderTitle">High availability</h1></header><article><div><span><!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
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+<p>Apache ZooKeeper, metadata store, the coordinator, the overlord, and brokers are recommended to set up a high availability environment.</p>
+<ul>
+<li>For highly-available ZooKeeper, you will need a cluster of 3 or 5 ZooKeeper nodes.
+We recommend either installing ZooKeeper on its own hardware, or running 3 or 5 Master servers (where overlords or coordinators are running)
+and configuring ZooKeeper on them appropriately. See the <a href="https://zookeeper.apache.org/doc/current/zookeeperAdmin.html">ZooKeeper admin guide</a> for more details.</li>
+<li>For highly-available metadata storage, we recommend MySQL or PostgreSQL with replication and failover enabled.
+See <a href="https://dev.mysql.com/doc/mysql-ha-scalability/en/">MySQL HA/Scalability Guide</a>
+and <a href="https://www.postgresql.org/docs/9.5/high-availability.html">PostgreSQL's High Availability, Load Balancing, and Replication</a> for MySQL and PostgreSQL, respectively.</li>
+<li>For highly-available Apache Druid Coordinators and Overlords, we recommend to run multiple servers.
+If they are all configured to use the same ZooKeeper cluster and metadata storage,
+then they will automatically failover between each other as necessary.
+Only one will be active at a time, but inactive servers will redirect to the currently active server.</li>
+<li>Druid Brokers can be scaled out and all running servers will be active and queryable.
+We recommend placing them behind a load balancer.</li>
+</ul>
+</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/0.20.0/operations/api-reference.html"><span class="arrow-prev">← </span><span>API reference</span></a><a class="docs-next button" href="/docs/0.20.0/operations/rolling-updates.html"><span>Rolling updates</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"></nav></div><footer class="nav-footer druid-footer" id="footer"><div class="container"><div class="text-center"><p><a href="/technology">Technology</a> · <a href="/use-cases">Use Cases</a> · <a href="/druid-powered">Powered by Druid</a> · <a href="/docs/0.20.0/latest">Docs</a> · <a href="/community/">Community</a> · <a href="/downloads.html">Download</a> · <a href="/faq">FAQ</a></p></div><div class="text-center"><a title="Join the user group" href="https://groups.google.com/forum/#!forum/druid-user" target="_blank"><span class="fa fa-comments"></span></a> · <a title="Follow Druid" href="https://twitter.com/druidio" target="_blank"><span class="fab fa-twitter"></span></a> · <a title="Download via Apache" href="https://www.apache.org/dyn/closer.cgi?path=/incubator/druid/{{ site.druid_versions[0].versions[0].version }}/apache-druid-{{ site.druid_versions[0].versions[0].version }}-bin.tar.gz" target="_blank"><span class="fas fa-feather"></span></a> · <a title="GitHub" href="https://github.com/apache/druid" target="_blank"><span class="fab fa-github"></span></a></div><div class="text-center license">Copyright © 2019 <a href="https://www.apache.org/" target="_blank">Apache Software Foundation</a>.<br/>Except where otherwise noted, licensed under <a rel="license" href="http://creativecommons.org/licenses/by-sa/4.0/">CC BY-SA 4.0</a>.<br/>Apache Druid, Druid, and the Druid logo are either registered trademarks or trademarks of The Apache Software Foundation in the United States and other countries.</div></div></footer></div><script type="text/javascript" src="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.js"></script><script>
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+  ~ Licensed to the Apache Software Foundation (ASF) under one
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+  -->
+<p>Apache Druid supports http request decompression and response compression, to use this, http request header <code>Content-Encoding:gzip</code> and  <code>Accept-Encoding:gzip</code> is needed to be set.</p>
+<table>
+<thead>
+<tr><th>Property</th><th>Description</th><th>Default</th></tr>
+</thead>
+<tbody>
+<tr><td><code>druid.server.http.compressionLevel</code></td><td>The compression level. Value should be between [-1,9], -1 for default level, 0 for no compression.</td><td>-1 (default compression level)</td></tr>
+<tr><td><code>druid.server.http.inflateBufferSize</code></td><td>The buffer size used by gzip decoder. Set to 0 to disable request decompression.</td><td>4096</td></tr>
+</tbody>
+</table>
+</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/0.20.0/operations/other-hadoop.html"><span class="arrow-prev">← </span><span>Working with different versions of Apache Hadoop</span></a><a class="docs-next button" href="/docs/0.20.0/operations/tls-support.html"><span>TLS support</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"></nav></div><footer class="nav-footer druid-footer" id="footer"><div class="container"><div class="text-center"><p><a href="/technology">Technology</a> · <a href="/use-cases">Use Cases</a> · <a href="/druid-powered">Powered by Druid</a> · <a href="/docs/0.20.0/latest">Docs</a> · <a href="/community/">Community</a> · <a href="/downloads.html">Download</a> · <a href="/faq">FAQ</a></p></div><div class="text-center"><a title="Join the user group" href="https://groups.google.com/forum/#!forum/druid-user" target="_blank"><span class="fa fa-comments"></span></a> · <a title="Follow Druid" href="https://twitter.com/druidio" target="_blank"><span class="fab fa-twitter"></span></a> · <a title="Download via Apache" href="https://www.apache.org/dyn/closer.cgi?path=/incubator/druid/{{ site.druid_versions[0].versions[0].version }}/apache-druid-{{ site.druid_versions[0].versions[0].version }}-bin.tar.gz" target="_blank"><span class="fas fa-feather"></span></a> · <a title="GitHub" href="https://github.com/apache/druid" target="_blank"><span class="fab fa-github"></span></a></div><div class="text-center license">Copyright © 2019 <a href="https://www.apache.org/" target="_blank">Apache Software Foundation</a>.<br/>Except where otherwise noted, licensed under <a rel="license" href="http://creativecommons.org/licenses/by-sa/4.0/">CC BY-SA 4.0</a>.<br/>Apache Druid, Druid, and the Druid logo are either registered trademarks or trademarks of The Apache Software Foundation in the United States and other countries.</div></div></footer></div><script type="text/javascript" src="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.js"></script><script>
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diff --git a/docs/0.20.0/operations/including-extensions.html b/docs/0.20.0/operations/including-extensions.html
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+<meta charset="utf-8">
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diff --git a/docs/0.20.0/operations/insert-segment-to-db.html b/docs/0.20.0/operations/insert-segment-to-db.html
new file mode 100644
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+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>insert-segment-to-db tool · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/0.20.0/operations/insert-segment-to-db.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.20.0" /><meta property="og:title" content="insert-segment-to-db tool · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
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+<p>In older versions of Apache Druid, <code>insert-segment-to-db</code> was a tool that could scan deep storage and
+insert data from there into Druid metadata storage. It was intended to be used to update the segment table in the
+metadata storage after manually migrating segments from one place to another, or even to recover lost metadata storage
+by telling it where the segments are stored.</p>
+<p>In Druid 0.14.x and earlier, Druid wrote segment metadata to two places: the metadata store's <code>druid_segments</code> table, and
+<code>descriptor.json</code> files in deep storage. This practice was stopped in Druid 0.15.0 as part of
+<a href="https://github.com/apache/druid/issues/6849">consolidated metadata management</a>, for the following reasons:</p>
+<ol>
+<li>If any segments are manually dropped or re-enabled by cluster operators, this information is not reflected in
+deep storage. Restoring metadata from deep storage would undo any such drops or re-enables.</li>
+<li>Ingestion methods that allocate segments optimistically (such as native Kafka or Kinesis stream ingestion, or native
+batch ingestion in 'append' mode) can write segments to deep storage that are not meant to actually be used by the
+Druid cluster. There is no way, while purely looking at deep storage, to differentiate the segments that made it into
+the metadata store originally (and therefore <em>should</em> be used) from the segments that did not (and therefore
+<em>should not</em> be used).</li>
+<li>Nothing in Druid other than the <code>insert-segment-to-db</code> tool read the <code>descriptor.json</code> files.</li>
+</ol>
+<p>After this change, Druid stopped writing <code>descriptor.json</code> files to deep storage, and now only writes segment metadata
+to the metadata store. This meant the <code>insert-segment-to-db</code> tool is no longer useful, so it was removed in Druid 0.15.0.</p>
+<p>It is highly recommended that you take regular backups of your metadata store, since it is difficult to recover Druid
+clusters properly without it.</p>
+</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/0.20.0/operations/reset-cluster.html"><span class="arrow-prev">← </span><span>reset-cluster tool</span></a><a class="docs-next button" href="/docs/0.20.0/operations/pull-deps.html"><span>pull-deps tool</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"></nav></div><footer class="nav-footer druid-footer" id="footer"><div class="container"><div class="text-center"><p><a href="/technology">Technology</a> · <a href="/use-cases">Use Cases</a> · <a href="/druid-powered">Powered by Druid</a> · <a href="/docs/0.20.0/latest">Docs</a> · <a href="/community/">Community</a> · <a href="/downloads.html">Download</a> · <a href="/faq">FAQ</a></p></div><div class="text-center"><a title="Join the user group" href="https://groups.google.com/forum/#!forum/druid-user" target="_blank"><span class="fa fa-comments"></span></a> · <a title="Follow Druid" href="https://twitter.com/druidio" target="_blank"><span class="fab fa-twitter"></span></a> · <a title="Download via Apache" href="https://www.apache.org/dyn/closer.cgi?path=/incubator/druid/{{ site.druid_versions[0].versions[0].version }}/apache-druid-{{ site.druid_versions[0].versions[0].version }}-bin.tar.gz" target="_blank"><span class="fas fa-feather"></span></a> · <a title="GitHub" href="https://github.com/apache/druid" target="_blank"><span class="fab fa-github"></span></a></div><div class="text-center license">Copyright © 2019 <a href="https://www.apache.org/" target="_blank">Apache Software Foundation</a>.<br/>Except where otherwise noted, licensed under <a rel="license" href="http://creativecommons.org/licenses/by-sa/4.0/">CC BY-SA 4.0</a>.<br/>Apache Druid, Druid, and the Druid logo are either registered trademarks or trademarks of The Apache Software Foundation in the United States and other countries.</div></div></footer></div><script type="text/javascript" src="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.js"></script><script>
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+                    return;
+                  }
+                  // keyCode for '/' (slash)
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+                    const search = document.getElementById('search_input_react');
+                    search && search.focus();
+                  }
+                });
+              </script><script>
+              var search = docsearch({
+                
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+              });
+            </script></body></html>
\ No newline at end of file
diff --git a/docs/0.20.0/operations/kubernetes.html b/docs/0.20.0/operations/kubernetes.html
new file mode 100644
index 0000000..ce6e863
--- /dev/null
+++ b/docs/0.20.0/operations/kubernetes.html
@@ -0,0 +1,47 @@
+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>kubernetes · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/0.20.0/operations/kubernetes.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.20.0" /><meta property="og:title" content="kubernetes · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
+              window.dataLayer = window.dataLayer || [];
+              function gtag(){dataLayer.push(arguments); }
+              gtag('js', new Date());
+              gtag('config', 'UA-131010415-1');
+            </script><link rel="stylesheet" href="https://use.fontawesome.com/releases/v5.7.2/css/all.css"/><link rel="stylesheet" href="/css/code-block-buttons.css"/><script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/clipboard.js/2.0.4/clipboard.min.js"></script><script type="text/javascript" src="/js/code-block-buttons.js"></script><script src="/js/scrollSpy.js"></script><link rel="stylesheet" href="/css/main.css"/><script src="/js/codetabs.js"></script></head><body class="sideNavVisible separateOnPageNav"><div class="fixedHeaderContainer"><div class="headerWrapper wrapper"><header><a href="/"><img class="logo" src="/img/druid_nav.png" alt="Apache Druid"/></a><div class="navigationWrapper navigationSlider"><nav class="slidingNav"><ul class="nav-site nav-site-internal"><li class=""><a href="/technology" target="_self">Technology</a></li><li class=""><a href="/use-cases" target="_self">Use Cases</a></li><li class=""><a href="/druid-powered" target="_self">Powered By</a></li><li class=""><a href="/docs/0.20.0/design/index.html" target="_self">Docs</a></li><li class=""><a href="/community/" target="_self">Community</a></li><li class=""><a href="https://www.apache.org" target="_self">Apache</a></li><li class=""><a href="/downloads.html" target="_self">Download</a></li><li class="navSearchWrapper reactNavSearchWrapper"><input type="text" id="search_input_react" placeholder="Search" title="Search"/></li></ul></nav></div></header></div></div><div class="navPusher"><div class="docMainWrapper wrapper"><div class="container mainContainer docsContainer"><div class="wrapper"><div class="post"><header class="postHeader"><a class="edit-page-link button" href="https://github.com/apache/druid/edit/master/docs/operations/kubernetes.md" target="_blank" rel="noreferrer noopener">Edit</a><h1 id="__docusaurus" class="postHeaderTitle">kubernetes</h1></header><article><div><span><!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+  -->
+<p>Apache Druid distribution is also available as <a href="https://www.docker.com/">Docker</a> image from <a href="https://hub.docker.com/r/apache/druid">Docker Hub</a> . For example, you can obtain release 0.16.0-incubating using the command below.</p>
+<pre><code class="hljs">$docker pull apache/druid:<span class="hljs-number">0.16</span><span class="hljs-number">.0</span>-incubating
+</code></pre>
+<p><a href="https://github.com/druid-io/druid-operator">druid-operator</a> can be used to manage a Druid cluster on <a href="https://kubernetes.io/">Kubernetes</a> .</p>
+</span></div></article></div><div class="docs-prevnext"></div></div></div><nav class="onPageNav"></nav></div><footer class="nav-footer druid-footer" id="footer"><div class="container"><div class="text-center"><p><a href="/technology">Technology</a> · <a href="/use-cases">Use Cases</a> · <a href="/druid-powered">Powered by Druid</a> · <a href="/docs/0.20.0/latest">Docs</a> · <a href="/community/">Community</a> · <a href="/downloads.html">Download</a> · <a href="/faq">FAQ</a></p></div><div class="text-center"><a title="Join the user group" href="https://groups.google.com/forum/#!forum/druid-user" target="_blank"><span class="fa fa-comments"></span></a> · <a title="Follow Druid" href="https://twitter.com/druidio" target="_blank"><span class="fab fa-twitter"></span></a> · <a title="Download via Apache" href="https://www.apache.org/dyn/closer.cgi?path=/incubator/druid/{{ site.druid_versions[0].versions[0].version }}/apache-druid-{{ site.druid_versions[0].versions[0].version }}-bin.tar.gz" target="_blank"><span class="fas fa-feather"></span></a> · <a title="GitHub" href="https://github.com/apache/druid" target="_blank"><span class="fab fa-github"></span></a></div><div class="text-center license">Copyright © 2019 <a href="https://www.apache.org/" target="_blank">Apache Software Foundation</a>.<br/>Except where otherwise noted, licensed under <a rel="license" href="http://creativecommons.org/licenses/by-sa/4.0/">CC BY-SA 4.0</a>.<br/>Apache Druid, Druid, and the Druid logo are either registered trademarks or trademarks of The Apache Software Foundation in the United States and other countries.</div></div></footer></div><script type="text/javascript" src="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.js"></script><script>
+                document.addEventListener('keyup', function(e) {
+                  if (e.target !== document.body) {
+                    return;
+                  }
+                  // keyCode for '/' (slash)
+                  if (e.keyCode === 191) {
+                    const search = document.getElementById('search_input_react');
+                    search && search.focus();
+                  }
+                });
+              </script><script>
+              var search = docsearch({
+                
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+                indexName: 'apache_druid',
+                inputSelector: '#search_input_react',
+                algoliaOptions: {"facetFilters":["language:en","version:0.20.0"]}
+              });
+            </script></body></html>
\ No newline at end of file
diff --git a/docs/0.20.0/operations/management-uis.html b/docs/0.20.0/operations/management-uis.html
new file mode 100644
index 0000000..94517b7
--- /dev/null
+++ b/docs/0.20.0/operations/management-uis.html
@@ -0,0 +1,119 @@
+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Legacy Management UIs · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/0.20.0/operations/management-uis.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.20.0" /><meta property="og:title" content="Legacy Management UIs · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
+              window.dataLayer = window.dataLayer || [];
+              function gtag(){dataLayer.push(arguments); }
+              gtag('js', new Date());
+              gtag('config', 'UA-131010415-1');
+            </script><link rel="stylesheet" href="https://use.fontawesome.com/releases/v5.7.2/css/all.css"/><link rel="stylesheet" href="/css/code-block-buttons.css"/><script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/clipboard.js/2.0.4/clipboard.min.js"></script><script type="text/javascript" src="/js/code-block-buttons.js"></script><script src="/js/scrollSpy.js"></script><link rel="stylesheet" href="/css/main.css"/><script src="/js/codetabs.js"></script></head><body class="sideNavVisible separateOnPageNav"><div class="fixedHeaderContainer"><div class="headerWrapper wrapper"><header><a href="/"><img class="logo" src="/img/druid_nav.png" alt="Apache Druid"/></a><div class="navigationWrapper navigationSlider"><nav class="slidingNav"><ul class="nav-site nav-site-internal"><li class=""><a href="/technology" target="_self">Technology</a></li><li class=""><a href="/use-cases" target="_self">Use Cases</a></li><li class=""><a href="/druid-powered" 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class="icon-toc"></i></div></div><div class="navGroups"><div class="navGroup"><h3 class="navGroupCategoryTitle collapsible">Getting started<span class="arrow"><svg width="24" height="24" viewBox="0 0 24 24"><path fill="#565656" d="M7.41 15.41L12 10.83l4.59 4.58L18 14l-6-6-6 6z"></path><path d="M0 0h24v24H0z" fill="none"></path></svg></span></h3><ul class="hide"><li class="navListItem"><a class="navItem" href="/docs/0.20.0/design/index.html">Introduction to Apache Druid</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/tutorials/index.html">Quickstart</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/tutorials/docker.html">Docker</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/operations/single-server.html">Single server deployment</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/tutorials/cluster.html">Clustered deployment</a></li></ul></div><div class="navGroup"><h3 class="navGroupCategoryTitle 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Management UIs</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/operations/deep-storage-migration.html">Deep storage migration</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/operations/export-metadata.html">Export Metadata Tool</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/operations/metadata-migration.html">Metadata Migration</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/operations/segment-optimization.html">Segment Size Optimization</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/operations/use_sbt_to_build_fat_jar.html">Content for build.sbt</a></li></ul></div></ul></div><div class="navGroup"><h3 class="navGroupCategoryTitle collapsible">Development<span class="arrow"><svg width="24" height="24" viewBox="0 0 24 24"><path fill="#565656" d="M7.41 15.41L12 10.83l4.59 4.58L18 14l-6-6-6 6z"></path><path d="M0 0h24v24H0z" fill="none"></path></svg></span></h3><ul 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+<h2><a class="anchor" aria-hidden="true" id="legacy-consoles"></a><a href="#legacy-consoles" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Legacy consoles</h2>
+<p>Druid provides a console for managing datasources, segments, tasks, data processes (Historicals and MiddleManagers), and coordinator dynamic configuration. The user can also run SQL and native Druid queries within the console.</p>
+<p>For more information on the Druid Console, have a look at the <a href="/docs/0.20.0/operations/druid-console.html">Druid Console overview</a></p>
+<p>The Druid Console contains all of the functionality provided by the older consoles described below, which are still available if needed. The legacy consoles may be replaced by the Druid Console in the future.</p>
+<p>These older consoles provide a subset of the functionality of the Druid Console. We recommend using the Druid Console if possible.</p>
+<h3><a class="anchor" aria-hidden="true" id="coordinator-consoles"></a><a href="#coordinator-consoles" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Coordinator consoles</h3>
+<h4><a class="anchor" aria-hidden="true" id="version-2"></a><a href="#version-2" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Version 2</h4>
+<p>The Druid Coordinator exposes a web console for displaying cluster information and rule configuration. After the Coordinator starts, the console can be accessed at:</p>
+<pre><code class="hljs">http://<span class="hljs-tag">&lt;<span class="hljs-name">COORDINATOR_IP</span>&gt;</span>:<span class="hljs-tag">&lt;<span class="hljs-name">COORDINATOR_PORT</span>&gt;</span>
+</code></pre>
+<p>There exists a full cluster view (which shows indexing tasks and Historical processes), as well as views for individual Historical processes, datasources and segments themselves. Segment information can be displayed in raw JSON form or as part of a sortable and filterable table.</p>
+<p>The Coordinator console also exposes an interface to creating and editing rules. All valid datasources configured in the segment database, along with a default datasource, are available for configuration. Rules of different types can be added, deleted or edited.</p>
+<h4><a class="anchor" aria-hidden="true" id="version-1"></a><a href="#version-1" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Version 1</h4>
+<p>The oldest version of Druid's Coordinator console is still available for backwards compatibility at:</p>
+<pre><code class="hljs">http://<span class="hljs-tag">&lt;<span class="hljs-name">COORDINATOR_IP</span>&gt;</span>:<span class="hljs-tag">&lt;<span class="hljs-name">COORDINATOR_PORT</span>&gt;</span>/old-console
+</code></pre>
+<h3><a class="anchor" aria-hidden="true" id="overlord-console"></a><a href="#overlord-console" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Overlord console</h3>
+<p>The Overlord console can be used to view pending tasks, running tasks, available workers, and recent worker creation and termination. The console can be accessed at:</p>
+<pre><code class="hljs">http://<span class="hljs-tag">&lt;<span class="hljs-name">OVERLORD_IP</span>&gt;</span>:<span class="hljs-tag">&lt;<span class="hljs-name">OVERLORD_PORT</span>&gt;</span>/console.html
+</code></pre>
+</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/0.20.0/operations/pull-deps.html"><span class="arrow-prev">← </span><span>pull-deps tool</span></a><a class="docs-next button" href="/docs/0.20.0/operations/deep-storage-migration.html"><span>Deep storage migration</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#legacy-consoles">Legacy consoles</a><ul class="toc-headings"><li><a href="#coordinator-consoles">Coordinator consoles</a></li><li><a href="#overlord-console">Overlord console</a></li></ul></li></ul></nav></div><footer class="nav-footer druid-footer" id="footer"><div class="container"><div class="text-center"><p><a href="/technology">Technology</a> · <a href="/use-cases">Use Cases</a> · <a href="/druid-powered">Powered by Druid</a> · <a href="/docs/0.20.0/latest">Docs</a> · <a href="/community/">Community</a> · <a href="/downloads.html">Download</a> · <a href="/faq">FAQ</a></p></div><div class="text-center"><a title="Join the user group" href="https://groups.google.com/forum/#!forum/druid-user" target="_blank"><span class="fa fa-comments"></span></a> · <a title="Follow Druid" href="https://twitter.com/druidio" target="_blank"><span class="fab fa-twitter"></span></a> · <a title="Download via Apache" href="https://www.apache.org/dyn/closer.cgi?path=/incubator/druid/{{ site.druid_versions[0].versions[0].version }}/apache-druid-{{ site.druid_versions[0].versions[0].version }}-bin.tar.gz" target="_blank"><span class="fas fa-feather"></span></a> · <a title="GitHub" href="https://github.com/apache/druid" target="_blank"><span class="fab fa-github"></span></a></div><div class="text-center license">Copyright © 2019 <a href="https://www.apache.org/" target="_blank">Apache Software Foundation</a>.<br/>Except where otherwise noted, licensed under <a rel="license" href="http://creativecommons.org/licenses/by-sa/4.0/">CC BY-SA 4.0</a>.<br/>Apache Druid, Druid, and the Druid logo are either registered trademarks or trademarks of The Apache Software Foundation in the United States and other countries.</div></div></footer></div><script type="text/javascript" src="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.js"></script><script>
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+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Metadata Migration · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/0.20.0/operations/metadata-migration.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.20.0" /><meta property="og:title" content="Metadata Migration · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
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+<p>If you have been running an evaluation Druid cluster using the built-in Derby metadata storage and wish to migrate to a
+more production-capable metadata store such as MySQL or PostgreSQL, this document describes the necessary steps.</p>
+<h2><a class="anchor" aria-hidden="true" id="shut-down-cluster-services"></a><a href="#shut-down-cluster-services" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Shut down cluster services</h2>
+<p>To ensure a clean migration, shut down the non-coordinator services to ensure that metadata state will not
+change as you do the migration.</p>
+<p>When migrating from Derby, the coordinator processes will still need to be up initially, as they host the Derby database.</p>
+<h2><a class="anchor" aria-hidden="true" id="exporting-metadata"></a><a href="#exporting-metadata" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Exporting metadata</h2>
+<p>Druid provides an <a href="/docs/0.20.0/operations/export-metadata.html">Export Metadata Tool</a> for exporting metadata from Derby into CSV files
+which can then be imported into your new metadata store.</p>
+<p>The tool also provides options for rewriting the deep storage locations of segments; this is useful
+for <a href="/docs/0.20.0/operations/deep-storage-migration.html">deep storage migration</a>.</p>
+<p>Run the <code>export-metadata</code> tool on your existing cluster, and save the CSV files it generates. After a successful export, you can shut down the coordinator.</p>
+<h2><a class="anchor" aria-hidden="true" id="initializing-the-new-metadata-store"></a><a href="#initializing-the-new-metadata-store" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Initializing the new metadata store</h2>
+<h3><a class="anchor" aria-hidden="true" id="create-database"></a><a href="#create-database" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Create database</h3>
+<p>Before importing the existing cluster metadata, you will need to set up the new metadata store.</p>
+<p>The <a href="/docs/0.20.0/development/extensions-core/mysql.html">MySQL extension</a> and <a href="/docs/0.20.0/development/extensions-core/postgresql.html">PostgreSQL extension</a> docs have instructions for initial database setup.</p>
+<h3><a class="anchor" aria-hidden="true" id="update-configuration"></a><a href="#update-configuration" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Update configuration</h3>
+<p>Update your Druid runtime properties with the new metadata configuration.</p>
+<h3><a class="anchor" aria-hidden="true" id="create-druid-tables"></a><a href="#create-druid-tables" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Create Druid tables</h3>
+<p>Druid provides a <code>metadata-init</code> tool for creating Druid's metadata tables. After initializing the Druid database, you can run the commands shown below from the root of the Druid package to initialize the tables.</p>
+<p>In the example commands below:</p>
+<ul>
+<li><code>lib</code> is the Druid lib directory</li>
+<li><code>extensions</code> is the Druid extensions directory</li>
+<li><code>base</code> corresponds to the value of <code>druid.metadata.storage.tables.base</code> in the configuration, <code>druid</code> by default.</li>
+<li>The <code>--connectURI</code> parameter corresponds to the value of <code>druid.metadata.storage.connector.connectURI</code>.</li>
+<li>The <code>--user</code> parameter corresponds to the value of <code>druid.metadata.storage.connector.user</code>.</li>
+<li>The <code>--password</code> parameter corresponds to the value of <code>druid.metadata.storage.connector.password</code>.</li>
+</ul>
+<h4><a class="anchor" aria-hidden="true" id="mysql"></a><a href="#mysql" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>MySQL</h4>
+<pre><code class="hljs css language-bash"><span class="hljs-built_in">cd</span> <span class="hljs-variable">${DRUID_ROOT}</span>
+java -classpath <span class="hljs-string">"lib/*"</span> -Dlog4j.configurationFile=conf/druid/cluster/_common/log4j2.xml -Ddruid.extensions.directory=<span class="hljs-string">"extensions"</span> -Ddruid.extensions.loadList=[\"mysql-metadata-storage\"] -Ddruid.metadata.storage.type=mysql org.apache.druid.cli.Main tools metadata-init --connectURI=<span class="hljs-string">"&lt;mysql-uri&gt;"</span> --user &lt;user&gt; --password &lt;pass&gt; --base druid
+</code></pre>
+<h4><a class="anchor" aria-hidden="true" id="postgresql"></a><a href="#postgresql" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>PostgreSQL</h4>
+<pre><code class="hljs css language-bash"><span class="hljs-built_in">cd</span> <span class="hljs-variable">${DRUID_ROOT}</span>
+java -classpath <span class="hljs-string">"lib/*"</span> -Dlog4j.configurationFile=conf/druid/cluster/_common/log4j2.xml -Ddruid.extensions.directory=<span class="hljs-string">"extensions"</span> -Ddruid.extensions.loadList=[\"postgresql-metadata-storage\"] -Ddruid.metadata.storage.type=postgresql org.apache.druid.cli.Main tools metadata-init --connectURI=<span class="hljs-string">"&lt;postgresql-uri&gt;"</span> --user &lt;user&gt; --password &lt;pass&gt; --base druid
+</code></pre>
+<h3><a class="anchor" aria-hidden="true" id="import-metadata"></a><a href="#import-metadata" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Import metadata</h3>
+<p>After initializing the tables, please refer to the <a href="../operations/export-metadata.html#importing-metadata">import commands</a> for your target database.</p>
+<h3><a class="anchor" aria-hidden="true" id="restart-cluster"></a><a href="#restart-cluster" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Restart cluster</h3>
+<p>After importing the metadata successfully, you can now restart your cluster.</p>
+</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/0.20.0/operations/export-metadata.html"><span class="arrow-prev">← </span><span>Export Metadata Tool</span></a><a class="docs-next button" href="/docs/0.20.0/operations/segment-optimization.html"><span>Segment Size Optimization</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#shut-down-cluster-services">Shut down cluster services</a></li><li><a href="#exporting-metadata">Exporting metadata</a></li><li><a href="#initializing-the-new-metadata-store">Initializing the new metadata store</a><ul class="toc-headings"><li><a href="#create-database">Create database</a></li><li><a href="#update-configuration">Update configuration</a></li><li><a href="#create-druid-tables">Create Druid tables</a></li><li><a href="#import-metadata">Import metadata</a></li><li><a href="#restart-cluster">Restart cluster</a></li></ul></li></ul></nav></div><footer class="nav-footer druid-footer" id="footer"><div class="container"><div class="text-center"><p><a href="/technology">Technology</a> · <a href="/use-cases">Use Cases</a> · <a href="/druid-powered">Powered by Druid</a> · <a href="/docs/0.20.0/latest">Docs</a> · <a href="/community/">Community</a> · <a href="/downloads.html">Download</a> · <a href="/faq">FAQ</a></p></div><div class="text-center"><a title="Join the user group" href="https://groups.google.com/forum/#!forum/druid-user" target="_blank"><span class="fa fa-comments"></span></a> · <a title="Follow Druid" href="https://twitter.com/druidio" target="_blank"><span class="fab fa-twitter"></span></a> · <a title="Download via Apache" href="https://www.apache.org/dyn/closer.cgi?path=/incubator/druid/{{ site.druid_versions[0].versions[0].version }}/apache-druid-{{ site.druid_versions[0].versions[0].version }}-bin.tar.gz" target="_blank"><span class="fas fa-feather"></span></a> · <a title="GitHub" href="https://github.com/apache/druid" target="_blank"><span class="fab fa-github"></span></a></div><div class="text-center license">Copyright © 2019 <a href="https://www.apache.org/" target="_blank">Apache Software Foundation</a>.<br/>Except where otherwise noted, licensed under <a rel="license" href="http://creativecommons.org/licenses/by-sa/4.0/">CC BY-SA 4.0</a>.<br/>Apache Druid, Druid, and the Druid logo are either registered trademarks or trademarks of The Apache Software Foundation in the United States and other countries.</div></div></footer></div><script type="text/javascript" src="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.js"></script><script>
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+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Metrics · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/0.20.0/operations/metrics.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.20.0" /><meta property="og:title" content="Metrics · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
+              window.dataLayer = window.dataLayer || [];
+              function gtag(){dataLayer.push(arguments); }
+              gtag('js', new Date());
+              gtag('config', 'UA-131010415-1');
+            </script><link rel="stylesheet" href="https://use.fontawesome.com/releases/v5.7.2/css/all.css"/><link rel="stylesheet" href="/css/code-block-buttons.css"/><script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/clipboard.js/2.0.4/clipboard.min.js"></script><script type="text/javascript" src="/js/code-block-buttons.js"></script><script src="/js/scrollSpy.js"></script><link rel="stylesheet" href="/css/main.css"/><script src="/js/codetabs.js"></script></head><body class="sideNavVisible separateOnPageNav"><div class="fixedHeaderContainer"><div class="headerWrapper wrapper"><header><a href="/"><img class="logo" src="/img/druid_nav.png" alt="Apache Druid"/></a><div class="navigationWrapper navigationSlider"><nav class="slidingNav"><ul class="nav-site nav-site-internal"><li class=""><a href="/technology" target="_self">Technology</a></li><li class=""><a href="/use-cases" target="_self">Use Cases</a></li><li class=""><a href="/druid-powered" 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+<p>Druid generates metrics related to queries, ingestion, and coordination.</p>
+<p>Metrics are emitted as JSON objects to a runtime log file or over HTTP (to a service such as Apache Kafka). Metric emission is disabled by default.</p>
+<p>All Druid metrics share a common set of fields:</p>
+<ul>
+<li><code>timestamp</code> - the time the metric was created</li>
+<li><code>metric</code> - the name of the metric</li>
+<li><code>service</code> - the service name that emitted the metric</li>
+<li><code>host</code> - the host name that emitted the metric</li>
+<li><code>value</code> - some numeric value associated with the metric</li>
+</ul>
+<p>Metrics may have additional dimensions beyond those listed above.</p>
+<p>Most metric values reset each emission period. By default druid emission period is 1 minute, this can be changed by setting the property <code>druid.monitoring.emissionPeriod</code>.</p>
+<h2><a class="anchor" aria-hidden="true" id="available-metrics"></a><a href="#available-metrics" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Available Metrics</h2>
+<h2><a class="anchor" aria-hidden="true" id="query-metrics"></a><a href="#query-metrics" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Query metrics</h2>
+<h3><a class="anchor" aria-hidden="true" id="broker"></a><a href="#broker" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Broker</h3>
+<table>
+<thead>
+<tr><th>Metric</th><th>Description</th><th>Dimensions</th><th>Normal Value</th></tr>
+</thead>
+<tbody>
+<tr><td><code>query/time</code></td><td>Milliseconds taken to complete a query.</td><td>Common: dataSource, type, interval, hasFilters, duration, context, remoteAddress, id. Aggregation Queries: numMetrics, numComplexMetrics. GroupBy: numDimensions. TopN: threshold, dimension.</td><td>&lt; 1s</td></tr>
+<tr><td><code>query/bytes</code></td><td>number of bytes returned in query response.</td><td>Common: dataSource, type, interval, hasFilters, duration, context, remoteAddress, id. Aggregation Queries: numMetrics, numComplexMetrics. GroupBy: numDimensions. TopN: threshold, dimension.</td><td></td></tr>
+<tr><td><code>query/node/time</code></td><td>Milliseconds taken to query individual historical/realtime processes.</td><td>id, status, server.</td><td>&lt; 1s</td></tr>
+<tr><td><code>query/node/bytes</code></td><td>number of bytes returned from querying individual historical/realtime processes.</td><td>id, status, server.</td><td></td></tr>
+<tr><td><code>query/node/ttfb</code></td><td>Time to first byte. Milliseconds elapsed until Broker starts receiving the response from individual historical/realtime processes.</td><td>id, status, server.</td><td>&lt; 1s</td></tr>
+<tr><td><code>query/node/backpressure</code></td><td>Milliseconds that the channel to this process has spent suspended due to backpressure.</td><td>id, status, server.</td><td></td></tr>
+<tr><td><code>query/count</code></td><td>number of total queries</td><td>This metric is only available if the QueryCountStatsMonitor module is included.</td><td></td></tr>
+<tr><td><code>query/success/count</code></td><td>number of queries successfully processed</td><td>This metric is only available if the QueryCountStatsMonitor module is included.</td><td></td></tr>
+<tr><td><code>query/failed/count</code></td><td>number of failed queries</td><td>This metric is only available if the QueryCountStatsMonitor module is included.</td><td></td></tr>
+<tr><td><code>query/interrupted/count</code></td><td>number of queries interrupted due to cancellation or timeout</td><td>This metric is only available if the QueryCountStatsMonitor module is included.</td><td></td></tr>
+<tr><td><code>sqlQuery/time</code></td><td>Milliseconds taken to complete a SQL query.</td><td>id, nativeQueryIds, dataSource, remoteAddress, success.</td><td>&lt; 1s</td></tr>
+<tr><td><code>sqlQuery/bytes</code></td><td>number of bytes returned in SQL query response.</td><td>id, nativeQueryIds, dataSource, remoteAddress, success.</td><td></td></tr>
+</tbody>
+</table>
+<h3><a class="anchor" aria-hidden="true" id="historical"></a><a href="#historical" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Historical</h3>
+<table>
+<thead>
+<tr><th>Metric</th><th>Description</th><th>Dimensions</th><th>Normal Value</th></tr>
+</thead>
+<tbody>
+<tr><td><code>query/time</code></td><td>Milliseconds taken to complete a query.</td><td>Common: dataSource, type, interval, hasFilters, duration, context, remoteAddress, id. Aggregation Queries: numMetrics, numComplexMetrics. GroupBy: numDimensions. TopN: threshold, dimension.</td><td>&lt; 1s</td></tr>
+<tr><td><code>query/segment/time</code></td><td>Milliseconds taken to query individual segment. Includes time to page in the segment from disk.</td><td>id, status, segment.</td><td>several hundred milliseconds</td></tr>
+<tr><td><code>query/wait/time</code></td><td>Milliseconds spent waiting for a segment to be scanned.</td><td>id, segment.</td><td>&lt; several hundred milliseconds</td></tr>
+<tr><td><code>segment/scan/pending</code></td><td>Number of segments in queue waiting to be scanned.</td><td></td><td>Close to 0</td></tr>
+<tr><td><code>query/segmentAndCache/time</code></td><td>Milliseconds taken to query individual segment or hit the cache (if it is enabled on the Historical process).</td><td>id, segment.</td><td>several hundred milliseconds</td></tr>
+<tr><td><code>query/cpu/time</code></td><td>Microseconds of CPU time taken to complete a query</td><td>Common: dataSource, type, interval, hasFilters, duration, context, remoteAddress, id. Aggregation Queries: numMetrics, numComplexMetrics. GroupBy: numDimensions. TopN: threshold, dimension.</td><td>Varies</td></tr>
+<tr><td><code>query/count</code></td><td>number of total queries</td><td>This metric is only available if the QueryCountStatsMonitor module is included.</td><td></td></tr>
+<tr><td><code>query/success/count</code></td><td>number of queries successfully processed</td><td>This metric is only available if the QueryCountStatsMonitor module is included.</td><td></td></tr>
+<tr><td><code>query/failed/count</code></td><td>number of failed queries</td><td>This metric is only available if the QueryCountStatsMonitor module is included.</td><td></td></tr>
+<tr><td><code>query/interrupted/count</code></td><td>number of queries interrupted due to cancellation or timeout</td><td>This metric is only available if the QueryCountStatsMonitor module is included.</td><td></td></tr>
+</tbody>
+</table>
+<h3><a class="anchor" aria-hidden="true" id="real-time"></a><a href="#real-time" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Real-time</h3>
+<table>
+<thead>
+<tr><th>Metric</th><th>Description</th><th>Dimensions</th><th>Normal Value</th></tr>
+</thead>
+<tbody>
+<tr><td><code>query/time</code></td><td>Milliseconds taken to complete a query.</td><td>Common: dataSource, type, interval, hasFilters, duration, context, remoteAddress, id. Aggregation Queries: numMetrics, numComplexMetrics. GroupBy: numDimensions. TopN: threshold, dimension.</td><td>&lt; 1s</td></tr>
+<tr><td><code>query/wait/time</code></td><td>Milliseconds spent waiting for a segment to be scanned.</td><td>id, segment.</td><td>several hundred milliseconds</td></tr>
+<tr><td><code>segment/scan/pending</code></td><td>Number of segments in queue waiting to be scanned.</td><td></td><td>Close to 0</td></tr>
+<tr><td><code>query/count</code></td><td>number of total queries</td><td>This metric is only available if the QueryCountStatsMonitor module is included.</td><td></td></tr>
+<tr><td><code>query/success/count</code></td><td>number of queries successfully processed</td><td>This metric is only available if the QueryCountStatsMonitor module is included.</td><td></td></tr>
+<tr><td><code>query/failed/count</code></td><td>number of failed queries</td><td>This metric is only available if the QueryCountStatsMonitor module is included.</td><td></td></tr>
+<tr><td><code>query/interrupted/count</code></td><td>number of queries interrupted due to cancellation or timeout</td><td>This metric is only available if the QueryCountStatsMonitor module is included.</td><td></td></tr>
+</tbody>
+</table>
+<h3><a class="anchor" aria-hidden="true" id="jetty"></a><a href="#jetty" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Jetty</h3>
+<table>
+<thead>
+<tr><th>Metric</th><th>Description</th><th>Normal Value</th></tr>
+</thead>
+<tbody>
+<tr><td><code>jetty/numOpenConnections</code></td><td>Number of open jetty connections.</td><td>Not much higher than number of jetty threads.</td></tr>
+</tbody>
+</table>
+<h3><a class="anchor" aria-hidden="true" id="cache"></a><a href="#cache" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Cache</h3>
+<table>
+<thead>
+<tr><th>Metric</th><th>Description</th><th>Normal Value</th></tr>
+</thead>
+<tbody>
+<tr><td><code>query/cache/delta/*</code></td><td>Cache metrics since the last emission.</td><td></td><td>N/A</td></tr>
+<tr><td><code>query/cache/total/*</code></td><td>Total cache metrics.</td><td></td><td>N/A</td></tr>
+</tbody>
+</table>
+<table>
+<thead>
+<tr><th>Metric</th><th>Description</th><th>Dimensions</th><th>Normal Value</th></tr>
+</thead>
+<tbody>
+<tr><td><code>*/numEntries</code></td><td>Number of cache entries.</td><td></td><td>Varies.</td></tr>
+<tr><td><code>*/sizeBytes</code></td><td>Size in bytes of cache entries.</td><td></td><td>Varies.</td></tr>
+<tr><td><code>*/hits</code></td><td>Number of cache hits.</td><td></td><td>Varies.</td></tr>
+<tr><td><code>*/misses</code></td><td>Number of cache misses.</td><td></td><td>Varies.</td></tr>
+<tr><td><code>*/evictions</code></td><td>Number of cache evictions.</td><td></td><td>Varies.</td></tr>
+<tr><td><code>*/hitRate</code></td><td>Cache hit rate.</td><td></td><td>~40%</td></tr>
+<tr><td><code>*/averageByte</code></td><td>Average cache entry byte size.</td><td></td><td>Varies.</td></tr>
+<tr><td><code>*/timeouts</code></td><td>Number of cache timeouts.</td><td></td><td>0</td></tr>
+<tr><td><code>*/errors</code></td><td>Number of cache errors.</td><td></td><td>0</td></tr>
+<tr><td><code>*/put/ok</code></td><td>Number of new cache entries successfully cached.</td><td></td><td>Varies, but more than zero.</td></tr>
+<tr><td><code>*/put/error</code></td><td>Number of new cache entries that could not be cached due to errors.</td><td></td><td>Varies, but more than zero.</td></tr>
+<tr><td><code>*/put/oversized</code></td><td>Number of potential new cache entries that were skipped due to being too large (based on <code>druid.{broker,historical,realtime}.cache.maxEntrySize</code> properties).</td><td></td><td>Varies.</td></tr>
+</tbody>
+</table>
+<h4><a class="anchor" aria-hidden="true" id="memcached-only-metrics"></a><a href="#memcached-only-metrics" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Memcached only metrics</h4>
+<p>Memcached client metrics are reported as per the following. These metrics come directly from the client as opposed to from the cache retrieval layer.</p>
+<table>
+<thead>
+<tr><th>Metric</th><th>Description</th><th>Dimensions</th><th>Normal Value</th></tr>
+</thead>
+<tbody>
+<tr><td><code>query/cache/memcached/total</code></td><td>Cache metrics unique to memcached (only if <code>druid.cache.type=memcached</code>) as their actual values</td><td>Variable</td><td>N/A</td></tr>
+<tr><td><code>query/cache/memcached/delta</code></td><td>Cache metrics unique to memcached (only if <code>druid.cache.type=memcached</code>) as their delta from the prior event emission</td><td>Variable</td><td>N/A</td></tr>
+</tbody>
+</table>
+<h2><a class="anchor" aria-hidden="true" id="sql-metrics"></a><a href="#sql-metrics" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>SQL Metrics</h2>
+<p>If SQL is enabled, the Broker will emit the following metrics for SQL.</p>
+<table>
+<thead>
+<tr><th>Metric</th><th>Description</th><th>Dimensions</th><th>Normal Value</th></tr>
+</thead>
+<tbody>
+<tr><td><code>sqlQuery/time</code></td><td>Milliseconds taken to complete a SQL.</td><td>id, nativeQueryIds, dataSource, remoteAddress, success.</td><td>&lt; 1s</td></tr>
+<tr><td><code>sqlQuery/bytes</code></td><td>number of bytes returned in SQL response.</td><td>id, nativeQueryIds, dataSource, remoteAddress, success.</td><td></td></tr>
+</tbody>
+</table>
+<h2><a class="anchor" aria-hidden="true" id="ingestion-metrics-kafka-indexing-service"></a><a href="#ingestion-metrics-kafka-indexing-service" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Ingestion Metrics (Kafka Indexing Service)</h2>
+<p>These metrics are applicable for the Kafka Indexing Service.</p>
+<table>
+<thead>
+<tr><th>Metric</th><th>Description</th><th>Dimensions</th><th>Normal Value</th></tr>
+</thead>
+<tbody>
+<tr><td><code>ingest/kafka/lag</code></td><td>Total lag between the offsets consumed by the Kafka indexing tasks and latest offsets in Kafka brokers across all partitions. Minimum emission period for this metric is a minute.</td><td>dataSource.</td><td>Greater than 0, should not be a very high number</td></tr>
+<tr><td><code>ingest/kafka/maxLag</code></td><td>Max lag between the offsets consumed by the Kafka indexing tasks and latest offsets in Kafka brokers across all partitions. Minimum emission period for this metric is a minute.</td><td>dataSource.</td><td>Greater than 0, should not be a very high number</td></tr>
+<tr><td><code>ingest/kafka/avgLag</code></td><td>Average lag between the offsets consumed by the Kafka indexing tasks and latest offsets in Kafka brokers across all partitions. Minimum emission period for this metric is a minute.</td><td>dataSource.</td><td>Greater than 0, should not be a very high number</td></tr>
+</tbody>
+</table>
+<h2><a class="anchor" aria-hidden="true" id="ingestion-metrics-kinesis-indexing-service"></a><a href="#ingestion-metrics-kinesis-indexing-service" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Ingestion Metrics (Kinesis Indexing Service)</h2>
+<p>These metrics are applicable for the Kinesis Indexing Service.</p>
+<table>
+<thead>
+<tr><th>Metric</th><th>Description</th><th>Dimensions</th><th>Normal Value</th></tr>
+</thead>
+<tbody>
+<tr><td><code>ingest/kinesis/lag/time</code></td><td>Total lag time in milliseconds between the current message sequence number consumed by the Kinesis indexing tasks and latest sequence number in Kinesis across all shards. Minimum emission period for this metric is a minute.</td><td>dataSource.</td><td>Greater than 0, up to max Kinesis retention period in milliseconds</td></tr>
+<tr><td><code>ingest/kinesis/maxLag/time</code></td><td>Max lag time in milliseconds between the current message sequence number consumed by the Kinesis indexing tasks and latest sequence number in Kinesis across all shards. Minimum emission period for this metric is a minute.</td><td>dataSource.</td><td>Greater than 0, up to max Kinesis retention period in milliseconds</td></tr>
+<tr><td><code>ingest/kinesis/avgLag/time</code></td><td>Average lag time in milliseconds between the current message sequence number consumed by the Kinesis indexing tasks and latest sequence number in Kinesis across all shards. Minimum emission period for this metric is a minute.</td><td>dataSource.</td><td>Greater than 0, up to max Kinesis retention period in milliseconds</td></tr>
+</tbody>
+</table>
+<h2><a class="anchor" aria-hidden="true" id="ingestion-metrics-realtime-process"></a><a href="#ingestion-metrics-realtime-process" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Ingestion metrics (Realtime process)</h2>
+<p>These metrics are only available if the RealtimeMetricsMonitor is included in the monitors list for the Realtime process. These metrics are deltas for each emission period.</p>
+<table>
+<thead>
+<tr><th>Metric</th><th>Description</th><th>Dimensions</th><th>Normal Value</th></tr>
+</thead>
+<tbody>
+<tr><td><code>ingest/events/thrownAway</code></td><td>Number of events rejected because they are outside the windowPeriod.</td><td>dataSource, taskId, taskType.</td><td>0</td></tr>
+<tr><td><code>ingest/events/unparseable</code></td><td>Number of events rejected because the events are unparseable.</td><td>dataSource, taskId, taskType.</td><td>0</td></tr>
+<tr><td><code>ingest/events/duplicate</code></td><td>Number of events rejected because the events are duplicated.</td><td>dataSource, taskId, taskType.</td><td>0</td></tr>
+<tr><td><code>ingest/events/processed</code></td><td>Number of events successfully processed per emission period.</td><td>dataSource, taskId, taskType.</td><td>Equal to your # of events per emission period.</td></tr>
+<tr><td><code>ingest/rows/output</code></td><td>Number of Druid rows persisted.</td><td>dataSource, taskId, taskType.</td><td>Your # of events with rollup.</td></tr>
+<tr><td><code>ingest/persists/count</code></td><td>Number of times persist occurred.</td><td>dataSource, taskId, taskType.</td><td>Depends on configuration.</td></tr>
+<tr><td><code>ingest/persists/time</code></td><td>Milliseconds spent doing intermediate persist.</td><td>dataSource, taskId, taskType.</td><td>Depends on configuration. Generally a few minutes at most.</td></tr>
+<tr><td><code>ingest/persists/cpu</code></td><td>Cpu time in Nanoseconds spent on doing intermediate persist.</td><td>dataSource, taskId, taskType.</td><td>Depends on configuration. Generally a few minutes at most.</td></tr>
+<tr><td><code>ingest/persists/backPressure</code></td><td>Milliseconds spent creating persist tasks and blocking waiting for them to finish.</td><td>dataSource, taskId, taskType.</td><td>0 or very low</td></tr>
+<tr><td><code>ingest/persists/failed</code></td><td>Number of persists that failed.</td><td>dataSource, taskId, taskType.</td><td>0</td></tr>
+<tr><td><code>ingest/handoff/failed</code></td><td>Number of handoffs that failed.</td><td>dataSource, taskId, taskType.</td><td>0</td></tr>
+<tr><td><code>ingest/merge/time</code></td><td>Milliseconds spent merging intermediate segments</td><td>dataSource, taskId, taskType.</td><td>Depends on configuration. Generally a few minutes at most.</td></tr>
+<tr><td><code>ingest/merge/cpu</code></td><td>Cpu time in Nanoseconds spent on merging intermediate segments.</td><td>dataSource, taskId, taskType.</td><td>Depends on configuration. Generally a few minutes at most.</td></tr>
+<tr><td><code>ingest/handoff/count</code></td><td>Number of handoffs that happened.</td><td>dataSource, taskId, taskType.</td><td>Varies. Generally greater than 0 once every segment granular period if cluster operating normally</td></tr>
+<tr><td><code>ingest/sink/count</code></td><td>Number of sinks not handoffed.</td><td>dataSource, taskId, taskType.</td><td>1~3</td></tr>
+<tr><td><code>ingest/events/messageGap</code></td><td>Time gap between the data time in event and current system time.</td><td>dataSource, taskId, taskType.</td><td>Greater than 0, depends on the time carried in event</td></tr>
+</tbody>
+</table>
+<p>Note: If the JVM does not support CPU time measurement for the current thread, ingest/merge/cpu and ingest/persists/cpu will be 0.</p>
+<h3><a class="anchor" aria-hidden="true" id="indexing-service"></a><a href="#indexing-service" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Indexing service</h3>
+<table>
+<thead>
+<tr><th>Metric</th><th>Description</th><th>Dimensions</th><th>Normal Value</th></tr>
+</thead>
+<tbody>
+<tr><td><code>task/run/time</code></td><td>Milliseconds taken to run a task.</td><td>dataSource, taskId, taskType, taskStatus.</td><td>Varies.</td></tr>
+<tr><td><code>task/action/log/time</code></td><td>Milliseconds taken to log a task action to the audit log.</td><td>dataSource, taskId, taskType</td><td>&lt; 1000 (subsecond)</td></tr>
+<tr><td><code>task/action/run/time</code></td><td>Milliseconds taken to execute a task action.</td><td>dataSource, taskId, taskType</td><td>Varies from subsecond to a few seconds, based on action type.</td></tr>
+<tr><td><code>segment/added/bytes</code></td><td>Size in bytes of new segments created.</td><td>dataSource, taskId, taskType, interval.</td><td>Varies.</td></tr>
+<tr><td><code>segment/moved/bytes</code></td><td>Size in bytes of segments moved/archived via the Move Task.</td><td>dataSource, taskId, taskType, interval.</td><td>Varies.</td></tr>
+<tr><td><code>segment/nuked/bytes</code></td><td>Size in bytes of segments deleted via the Kill Task.</td><td>dataSource, taskId, taskType, interval.</td><td>Varies.</td></tr>
+<tr><td><code>task/success/count</code></td><td>Number of successful tasks per emission period. This metric is only available if the TaskCountStatsMonitor module is included.</td><td>dataSource.</td><td>Varies.</td></tr>
+<tr><td><code>task/failed/count</code></td><td>Number of failed tasks per emission period. This metric is only available if the TaskCountStatsMonitor module is included.</td><td>dataSource.</td><td>Varies.</td></tr>
+<tr><td><code>task/running/count</code></td><td>Number of current running tasks. This metric is only available if the TaskCountStatsMonitor module is included.</td><td>dataSource.</td><td>Varies.</td></tr>
+<tr><td><code>task/pending/count</code></td><td>Number of current pending tasks. This metric is only available if the TaskCountStatsMonitor module is included.</td><td>dataSource.</td><td>Varies.</td></tr>
+<tr><td><code>task/waiting/count</code></td><td>Number of current waiting tasks. This metric is only available if the TaskCountStatsMonitor module is included.</td><td>dataSource.</td><td>Varies.</td></tr>
+<tr><td><code>taskSlot/total/count</code></td><td>Number of total task slots per emission period. This metric is only available if the TaskSlotCountStatsMonitor module is included.</td><td></td><td>Varies.</td></tr>
+<tr><td><code>taskSlot/idle/count</code></td><td>Number of idle task slots per emission period. This metric is only available if the TaskSlotCountStatsMonitor module is included.</td><td></td><td>Varies.</td></tr>
+<tr><td><code>taskSlot/used/count</code></td><td>Number of busy task slots per emission period. This metric is only available if the TaskSlotCountStatsMonitor module is included.</td><td></td><td>Varies.</td></tr>
+<tr><td><code>taskSlot/lazy/count</code></td><td>Number of total task slots in lazy marked MiddleManagers and Indexers per emission period. This metric is only available if the TaskSlotCountStatsMonitor module is included.</td><td></td><td>Varies.</td></tr>
+<tr><td><code>taskSlot/blacklisted/count</code></td><td>Number of total task slots in blacklisted MiddleManagers and Indexers per emission period. This metric is only available if the TaskSlotCountStatsMonitor module is included.</td><td></td><td>Varies.</td></tr>
+</tbody>
+</table>
+<h2><a class="anchor" aria-hidden="true" id="coordination"></a><a href="#coordination" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Coordination</h2>
+<p>These metrics are for the Druid Coordinator and are reset each time the Coordinator runs the coordination logic.</p>
+<table>
+<thead>
+<tr><th>Metric</th><th>Description</th><th>Dimensions</th><th>Normal Value</th></tr>
+</thead>
+<tbody>
+<tr><td><code>segment/assigned/count</code></td><td>Number of segments assigned to be loaded in the cluster.</td><td>tier.</td><td>Varies.</td></tr>
+<tr><td><code>segment/moved/count</code></td><td>Number of segments moved in the cluster.</td><td>tier.</td><td>Varies.</td></tr>
+<tr><td><code>segment/dropped/count</code></td><td>Number of segments dropped due to being overshadowed.</td><td>tier.</td><td>Varies.</td></tr>
+<tr><td><code>segment/deleted/count</code></td><td>Number of segments dropped due to rules.</td><td>tier.</td><td>Varies.</td></tr>
+<tr><td><code>segment/unneeded/count</code></td><td>Number of segments dropped due to being marked as unused.</td><td>tier.</td><td>Varies.</td></tr>
+<tr><td><code>segment/cost/raw</code></td><td>Used in cost balancing. The raw cost of hosting segments.</td><td>tier.</td><td>Varies.</td></tr>
+<tr><td><code>segment/cost/normalization</code></td><td>Used in cost balancing. The normalization of hosting segments.</td><td>tier.</td><td>Varies.</td></tr>
+<tr><td><code>segment/cost/normalized</code></td><td>Used in cost balancing. The normalized cost of hosting segments.</td><td>tier.</td><td>Varies.</td></tr>
+<tr><td><code>segment/loadQueue/size</code></td><td>Size in bytes of segments to load.</td><td>server.</td><td>Varies.</td></tr>
+<tr><td><code>segment/loadQueue/failed</code></td><td>Number of segments that failed to load.</td><td>server.</td><td>0</td></tr>
+<tr><td><code>segment/loadQueue/count</code></td><td>Number of segments to load.</td><td>server.</td><td>Varies.</td></tr>
+<tr><td><code>segment/dropQueue/count</code></td><td>Number of segments to drop.</td><td>server.</td><td>Varies.</td></tr>
+<tr><td><code>segment/size</code></td><td>Total size of used segments in a data source. Emitted only for data sources to which at least one used segment belongs.</td><td>dataSource.</td><td>Varies.</td></tr>
+<tr><td><code>segment/count</code></td><td>Number of used segments belonging to a data source. Emitted only for data sources to which at least one used segment belongs.</td><td>dataSource.</td><td>&lt; max</td></tr>
+<tr><td><code>segment/overShadowed/count</code></td><td>Number of overshadowed segments.</td><td></td><td>Varies.</td></tr>
+<tr><td><code>segment/unavailable/count</code></td><td>Number of segments (not including replicas) left to load until segments that should be loaded in the cluster are available for queries.</td><td>dataSource.</td><td>0</td></tr>
+<tr><td><code>segment/underReplicated/count</code></td><td>Number of segments (including replicas) left to load until segments that should be loaded in the cluster are available for queries.</td><td>tier, dataSource.</td><td>0</td></tr>
+<tr><td><code>tier/historical/count</code></td><td>Number of available historical nodes in each tier.</td><td>tier.</td><td>Varies.</td></tr>
+<tr><td><code>tier/replication/factor</code></td><td>Configured maximum replication factor in each tier.</td><td>tier.</td><td>Varies.</td></tr>
+<tr><td><code>tier/required/capacity</code></td><td>Total capacity in bytes required in each tier.</td><td>tier.</td><td>Varies.</td></tr>
+<tr><td><code>tier/total/capacity</code></td><td>Total capacity in bytes available in each tier.</td><td>tier.</td><td>Varies.</td></tr>
+</tbody>
+</table>
+<p>If <code>emitBalancingStats</code> is set to <code>true</code> in the Coordinator <a href="../configuration/index.html#dynamic-configuration">dynamic configuration</a>, then <a href="/docs/0.20.0/configuration/logging.html">log entries</a> for class
+<code>org.apache.druid.server.coordinator.duty.EmitClusterStatsAndMetrics</code> will have extra information on balancing
+decisions.</p>
+<h2><a class="anchor" aria-hidden="true" id="general-health"></a><a href="#general-health" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>General Health</h2>
+<h3><a class="anchor" aria-hidden="true" id="historical-1"></a><a href="#historical-1" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Historical</h3>
+<table>
+<thead>
+<tr><th>Metric</th><th>Description</th><th>Dimensions</th><th>Normal Value</th></tr>
+</thead>
+<tbody>
+<tr><td><code>segment/max</code></td><td>Maximum byte limit available for segments.</td><td></td><td>Varies.</td></tr>
+<tr><td><code>segment/used</code></td><td>Bytes used for served segments.</td><td>dataSource, tier, priority.</td><td>&lt; max</td></tr>
+<tr><td><code>segment/usedPercent</code></td><td>Percentage of space used by served segments.</td><td>dataSource, tier, priority.</td><td>&lt; 100%</td></tr>
+<tr><td><code>segment/count</code></td><td>Number of served segments.</td><td>dataSource, tier, priority.</td><td>Varies.</td></tr>
+<tr><td><code>segment/pendingDelete</code></td><td>On-disk size in bytes of segments that are waiting to be cleared out</td><td>Varies.</td></tr>
+</tbody>
+</table>
+<h3><a class="anchor" aria-hidden="true" id="jvm"></a><a href="#jvm" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>JVM</h3>
+<p>These metrics are only available if the JVMMonitor module is included.</p>
+<table>
+<thead>
+<tr><th>Metric</th><th>Description</th><th>Dimensions</th><th>Normal Value</th></tr>
+</thead>
+<tbody>
+<tr><td><code>jvm/pool/committed</code></td><td>Committed pool.</td><td>poolKind, poolName.</td><td>close to max pool</td></tr>
+<tr><td><code>jvm/pool/init</code></td><td>Initial pool.</td><td>poolKind, poolName.</td><td>Varies.</td></tr>
+<tr><td><code>jvm/pool/max</code></td><td>Max pool.</td><td>poolKind, poolName.</td><td>Varies.</td></tr>
+<tr><td><code>jvm/pool/used</code></td><td>Pool used.</td><td>poolKind, poolName.</td><td>&lt; max pool</td></tr>
+<tr><td><code>jvm/bufferpool/count</code></td><td>Bufferpool count.</td><td>bufferpoolName.</td><td>Varies.</td></tr>
+<tr><td><code>jvm/bufferpool/used</code></td><td>Bufferpool used.</td><td>bufferpoolName.</td><td>close to capacity</td></tr>
+<tr><td><code>jvm/bufferpool/capacity</code></td><td>Bufferpool capacity.</td><td>bufferpoolName.</td><td>Varies.</td></tr>
+<tr><td><code>jvm/mem/init</code></td><td>Initial memory.</td><td>memKind.</td><td>Varies.</td></tr>
+<tr><td><code>jvm/mem/max</code></td><td>Max memory.</td><td>memKind.</td><td>Varies.</td></tr>
+<tr><td><code>jvm/mem/used</code></td><td>Used memory.</td><td>memKind.</td><td>&lt; max memory</td></tr>
+<tr><td><code>jvm/mem/committed</code></td><td>Committed memory.</td><td>memKind.</td><td>close to max memory</td></tr>
+<tr><td><code>jvm/gc/count</code></td><td>Garbage collection count.</td><td>gcName (cms/g1/parallel/etc.), gcGen (old/young)</td><td>Varies.</td></tr>
+<tr><td><code>jvm/gc/cpu</code></td><td>Count of CPU time in Nanoseconds spent on garbage collection. Note: <code>jvm/gc/cpu</code> represents the total time over multiple GC cycles; divide by <code>jvm/gc/count</code> to get the mean GC time per cycle</td><td>gcName, gcGen</td><td>Sum of <code>jvm/gc/cpu</code> should be within 10-30% of sum of <code>jvm/cpu/total</code>, depending on the GC algorithm used (reported by <a href="../configuration/index.html#enabling-metrics"><code>JvmCpuMonitor</code></a>)</td></tr>
+</tbody>
+</table>
+<h3><a class="anchor" aria-hidden="true" id="eventreceiverfirehose"></a><a href="#eventreceiverfirehose" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>EventReceiverFirehose</h3>
+<p>The following metric is only available if the EventReceiverFirehoseMonitor module is included.</p>
+<table>
+<thead>
+<tr><th>Metric</th><th>Description</th><th>Dimensions</th><th>Normal Value</th></tr>
+</thead>
+<tbody>
+<tr><td><code>ingest/events/buffered</code></td><td>Number of events queued in the EventReceiverFirehose's buffer</td><td>serviceName, dataSource, taskId, taskType, bufferCapacity.</td><td>Equal to current # of events in the buffer queue.</td></tr>
+<tr><td><code>ingest/bytes/received</code></td><td>Number of bytes received by the EventReceiverFirehose.</td><td>serviceName, dataSource, taskId, taskType.</td><td>Varies.</td></tr>
+</tbody>
+</table>
+<h2><a class="anchor" aria-hidden="true" id="sys"></a><a href="#sys" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Sys</h2>
+<p>These metrics are only available if the SysMonitor module is included.</p>
+<table>
+<thead>
+<tr><th>Metric</th><th>Description</th><th>Dimensions</th><th>Normal Value</th></tr>
+</thead>
+<tbody>
+<tr><td><code>sys/swap/free</code></td><td>Free swap.</td><td></td><td>Varies.</td></tr>
+<tr><td><code>sys/swap/max</code></td><td>Max swap.</td><td></td><td>Varies.</td></tr>
+<tr><td><code>sys/swap/pageIn</code></td><td>Paged in swap.</td><td></td><td>Varies.</td></tr>
+<tr><td><code>sys/swap/pageOut</code></td><td>Paged out swap.</td><td></td><td>Varies.</td></tr>
+<tr><td><code>sys/disk/write/count</code></td><td>Writes to disk.</td><td>fsDevName, fsDirName, fsTypeName, fsSysTypeName, fsOptions.</td><td>Varies.</td></tr>
+<tr><td><code>sys/disk/read/count</code></td><td>Reads from disk.</td><td>fsDevName, fsDirName, fsTypeName, fsSysTypeName, fsOptions.</td><td>Varies.</td></tr>
+<tr><td><code>sys/disk/write/size</code></td><td>Bytes written to disk. Can we used to determine how much paging is occurring with regards to segments.</td><td>fsDevName, fsDirName, fsTypeName, fsSysTypeName, fsOptions.</td><td>Varies.</td></tr>
+<tr><td><code>sys/disk/read/size</code></td><td>Bytes read from disk. Can we used to determine how much paging is occurring with regards to segments.</td><td>fsDevName, fsDirName, fsTypeName, fsSysTypeName, fsOptions.</td><td>Varies.</td></tr>
+<tr><td><code>sys/net/write/size</code></td><td>Bytes written to the network.</td><td>netName, netAddress, netHwaddr</td><td>Varies.</td></tr>
+<tr><td><code>sys/net/read/size</code></td><td>Bytes read from the network.</td><td>netName, netAddress, netHwaddr</td><td>Varies.</td></tr>
+<tr><td><code>sys/fs/used</code></td><td>Filesystem bytes used.</td><td>fsDevName, fsDirName, fsTypeName, fsSysTypeName, fsOptions.</td><td>&lt; max</td></tr>
+<tr><td><code>sys/fs/max</code></td><td>Filesystesm bytes max.</td><td>fsDevName, fsDirName, fsTypeName, fsSysTypeName, fsOptions.</td><td>Varies.</td></tr>
+<tr><td><code>sys/mem/used</code></td><td>Memory used.</td><td></td><td>&lt; max</td></tr>
+<tr><td><code>sys/mem/max</code></td><td>Memory max.</td><td></td><td>Varies.</td></tr>
+<tr><td><code>sys/storage/used</code></td><td>Disk space used.</td><td>fsDirName.</td><td>Varies.</td></tr>
+<tr><td><code>sys/cpu</code></td><td>CPU used.</td><td>cpuName, cpuTime.</td><td>Varies.</td></tr>
+</tbody>
+</table>
+</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/0.20.0/operations/rule-configuration.html"><span class="arrow-prev">← </span><span>Retaining or automatically dropping data</span></a><a class="docs-next button" href="/docs/0.20.0/operations/alerts.html"><span>Alerts</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#available-metrics">Available Metrics</a></li><li><a href="#query-metrics">Query metrics</a><ul class="toc-headings"><li><a href="#broker">Broker</a></li><li><a href="#historical">Historical</a></li><li><a href="#real-time">Real-time</a></li><li><a href="#jetty">Jetty</a></li><li><a href="#cache">Cache</a></li></ul></li><li><a href="#sql-metrics">SQL Metrics</a></li><li><a href="#ingestion-metrics-kafka-indexing-service">Ingestion Metrics (Kafka Indexing Service)</a></li><li><a href="#ingestion-metrics-kinesis-indexing-service">Ingestion Metrics (Kinesis Indexing Service)</a></li><li><a href="#ingestion-metrics-realtime-process">Ingestion metrics (Realtime process)</a><ul class="toc-headings"><li><a href="#indexing-service">Indexing service</a></li></ul></li><li><a href="#coordination">Coordination</a></li><li><a href="#general-health">General Health</a><ul class="toc-headings"><li><a href="#historical-1">Historical</a></li><li><a href="#jvm">JVM</a></li><li><a href="#eventreceiverfirehose">EventReceiverFirehose</a></li></ul></li><li><a href="#sys">Sys</a></li></ul></nav></div><footer class="nav-footer druid-footer" id="footer"><div class="container"><div class="text-center"><p><a href="/technology">Technology</a> · <a href="/use-cases">Use Cases</a> · <a href="/druid-powered">Powered by Druid</a> · <a href="/docs/0.20.0/latest">Docs</a> · <a href="/community/">Community</a> · <a href="/downloads.html">Download</a> · <a href="/faq">FAQ</a></p></div><div class="text-center"><a title="Join the user group" href="https://groups.google.com/forum/#!forum/druid-user" target="_blank"><span class="fa fa-comments"></span></a> · <a title="Follow Druid" href="https://twitter.com/druidio" target="_blank"><span class="fab fa-twitter"></span></a> · <a title="Download via Apache" href="https://www.apache.org/dyn/closer.cgi?path=/incubator/druid/{{ site.druid_versions[0].versions[0].version }}/apache-druid-{{ site.druid_versions[0].versions[0].version }}-bin.tar.gz" target="_blank"><span class="fas fa-feather"></span></a> · <a title="GitHub" href="https://github.com/apache/druid" target="_blank"><span class="fab fa-github"></span></a></div><div class="text-center license">Copyright © 2019 <a href="https://www.apache.org/" target="_blank">Apache Software Foundation</a>.<br/>Except where otherwise noted, licensed under <a rel="license" href="http://creativecommons.org/licenses/by-sa/4.0/">CC BY-SA 4.0</a>.<br/>Apache Druid, Druid, and the Druid logo are either registered trademarks or trademarks of The Apache Software Foundation in the United States and other countries.</div></div></footer></div><script type="text/javascript" src="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.js"></script><script>
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+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>Redirecting...</title>
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href="/docs/0.20.0/development/extensions-contrib/graphite.html">Graphite Emitter</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-contrib/influx.html">InfluxDB Line Protocol Parser</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-contrib/influxdb-emitter.html">InfluxDB Emitter</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-contrib/kafka-emitter.html">Kafka Emitter</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-contrib/materialized-view.html">Materialized View</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-contrib/momentsketch-quantiles.html">Moment Sketches for Approximate Quantiles module</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-contrib/moving-average-query.html">Moving Average Query</a></li><li 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+        </script></nav></div><div class="container mainContainer docsContainer"><div class="wrapper"><div class="post"><header class="postHeader"><a class="edit-page-link button" href="https://github.com/apache/druid/edit/master/docs/operations/other-hadoop.md" target="_blank" rel="noreferrer noopener">Edit</a><h1 id="__docusaurus" class="postHeaderTitle">Working with different versions of Apache Hadoop</h1></header><article><div><span><!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
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+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
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+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+  -->
+<p>Apache Druid can interact with Hadoop in two ways:</p>
+<ol>
+<li><a href="/docs/0.20.0/development/extensions-core/hdfs.html">Use HDFS for deep storage</a> using the druid-hdfs-storage extension.</li>
+<li><a href="/docs/0.20.0/ingestion/hadoop.html">Batch-load data from Hadoop</a> using Map/Reduce jobs.</li>
+</ol>
+<p>These are not necessarily linked together; you can load data with Hadoop jobs into a non-HDFS deep storage (like S3),
+and you can use HDFS for deep storage even if you're loading data from streams rather than using Hadoop jobs.</p>
+<p>For best results, use these tips when configuring Druid to interact with your favorite Hadoop distribution.</p>
+<h2><a class="anchor" aria-hidden="true" id="tip-1-place-hadoop-xmls-on-druid-classpath"></a><a href="#tip-1-place-hadoop-xmls-on-druid-classpath" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Tip #1: Place Hadoop XMLs on Druid classpath</h2>
+<p>Place your Hadoop configuration XMLs (core-site.xml, hdfs-site.xml, yarn-site.xml, mapred-site.xml) on the classpath
+of your Druid processes. You can do this by copying them into <code>conf/druid/_common/core-site.xml</code>,
+<code>conf/druid/_common/hdfs-site.xml</code>, and so on. This allows Druid to find your Hadoop cluster and properly submit jobs.</p>
+<h2><a class="anchor" aria-hidden="true" id="tip-2-classloader-modification-on-hadoop-mapreduce-jobs-only"></a><a href="#tip-2-classloader-modification-on-hadoop-mapreduce-jobs-only" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Tip #2: Classloader modification on Hadoop (Map/Reduce jobs only)</h2>
+<p>Druid uses a number of libraries that are also likely present on your Hadoop cluster, and if these libraries conflict,
+your Map/Reduce jobs can fail. This problem can be avoided by enabling classloader isolation using the Hadoop job
+property <code>mapreduce.job.classloader = true</code>. This instructs Hadoop to use a separate classloader for Druid dependencies
+and for Hadoop's own dependencies.</p>
+<p>If your version of Hadoop does not support this functionality, you can also try setting the property
+<code>mapreduce.job.user.classpath.first = true</code>. This instructs Hadoop to prefer loading Druid's version of a library when
+there is a conflict.</p>
+<p>Generally, you should only set one of these parameters, not both.</p>
+<p>These properties can be set in either one of the following ways:</p>
+<ul>
+<li>Using the task definition, e.g. add <code>&quot;mapreduce.job.classloader&quot;: &quot;true&quot;</code> to the <code>jobProperties</code> of the <code>tuningConfig</code> of your indexing task (see the <a href="/docs/0.20.0/ingestion/hadoop.html">Hadoop batch ingestion documentation</a>).</li>
+<li>Using system properties, e.g. on the MiddleManager set <code>druid.indexer.runner.javaOpts=... -Dhadoop.mapreduce.job.classloader=true</code> in <a href="/docs/0.20.0/configuration/index.html#middlemanager-configuration">Middle Manager configuration</a>.</li>
+</ul>
+<h3><a class="anchor" aria-hidden="true" id="overriding-specific-classes"></a><a href="#overriding-specific-classes" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Overriding specific classes</h3>
+<p>When <code>mapreduce.job.classloader = true</code>, it is also possible to specifically define which classes should be loaded from the hadoop system classpath and which should be loaded from job-supplied JARs.</p>
+<p>This is controlled by defining class inclusion/exclusion patterns in the <code>mapreduce.job.classloader.system.classes</code> property in the <code>jobProperties</code> of <code>tuningConfig</code>.</p>
+<p>For example, some community members have reported version incompatibility errors with the Validator class:</p>
+<pre><code class="hljs"><span class="hljs-keyword">Error: </span>java.lang.ClassNotFoundException: javax.validation.Validator
+</code></pre>
+<p>The following <code>jobProperties</code> excludes <code>javax.validation.</code> classes from being loaded from the system classpath, while including those from <code>java.,javax.,org.apache.commons.logging.,org.apache.log4j.,org.apache.hadoop.</code>.</p>
+<pre><code class="hljs"><span class="hljs-string">"jobProperties"</span>: {
+  <span class="hljs-string">"mapreduce.job.classloader"</span>: <span class="hljs-string">"true"</span>,
+  <span class="hljs-string">"mapreduce.job.classloader.system.classes"</span>: <span class="hljs-string">"-javax.validation.,java.,javax.,org.apache.commons.logging.,org.apache.log4j.,org.apache.hadoop."</span>
+}
+</code></pre>
+<p><a href="https://hadoop.apache.org/docs/current/hadoop-mapreduce-client/hadoop-mapreduce-client-core/mapred-default.xml">mapred-default.xml</a> documentation contains more information about this property.</p>
+<h2><a class="anchor" aria-hidden="true" id="tip-3-use-specific-versions-of-hadoop-libraries"></a><a href="#tip-3-use-specific-versions-of-hadoop-libraries" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Tip #3: Use specific versions of Hadoop libraries</h2>
+<p>Druid loads Hadoop client libraries from two different locations. Each set of libraries is loaded in an isolated
+classloader.</p>
+<ol>
+<li>HDFS deep storage uses jars from <code>extensions/druid-hdfs-storage/</code> to read and write Druid data on HDFS.</li>
+<li>Batch ingestion uses jars from <code>hadoop-dependencies/</code> to submit Map/Reduce jobs (location customizable via the
+<code>druid.extensions.hadoopDependenciesDir</code> runtime property; see <a href="../configuration/index.html#extensions">Configuration</a>).</li>
+</ol>
+<p><code>hadoop-client:2.8.5</code> is the default version of the Hadoop client bundled with Druid for both purposes. This works with
+many Hadoop distributions (the version does not necessarily need to match), but if you run into issues, you can instead
+have Druid load libraries that exactly match your distribution. To do this, either copy the jars from your Hadoop
+cluster, or use the <code>pull-deps</code> tool to download the jars from a Maven repository.</p>
+<h3><a class="anchor" aria-hidden="true" id="preferred-load-using-druids-standard-mechanism"></a><a href="#preferred-load-using-druids-standard-mechanism" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Preferred: Load using Druid's standard mechanism</h3>
+<p>If you have issues with HDFS deep storage, you can switch your Hadoop client libraries by recompiling the
+druid-hdfs-storage extension using an alternate version of the Hadoop client libraries. You can do this by editing
+the main Druid pom.xml and rebuilding the distribution by running <code>mvn package</code>.</p>
+<p>If you have issues with Map/Reduce jobs, you can switch your Hadoop client libraries without rebuilding Druid. You can
+do this by adding a new set of libraries to the <code>hadoop-dependencies/</code> directory (or another directory specified by
+druid.extensions.hadoopDependenciesDir) and then using <code>hadoopDependencyCoordinates</code> in the
+<a href="/docs/0.20.0/ingestion/hadoop.html">Hadoop Index Task</a> to specify the Hadoop dependencies you want Druid to load.</p>
+<p>Example:</p>
+<p>Suppose you specify <code>druid.extensions.hadoopDependenciesDir=/usr/local/druid_tarball/hadoop-dependencies</code>, and you have downloaded
+<code>hadoop-client</code> 2.3.0 and 2.4.0, either by copying them from your Hadoop cluster or by using <code>pull-deps</code> to download
+the jars from a Maven repository. Then underneath <code>hadoop-dependencies</code>, your jars should look like this:</p>
+<pre><code class="hljs">hadoop-dependencies/
+└── hadoop-client
+    ├── <span class="hljs-number">2.3</span><span class="hljs-number">.0</span>
+    │   ├── activation<span class="hljs-number">-1.1</span>.jar
+    │   ├── avro<span class="hljs-number">-1.7</span><span class="hljs-number">.4</span>.jar
+    │   ├── commons-beanutils<span class="hljs-number">-1.7</span><span class="hljs-number">.0</span>.jar
+    │   ├── commons-beanutils-core<span class="hljs-number">-1.8</span><span class="hljs-number">.0</span>.jar
+    │   ├── commons-cli<span class="hljs-number">-1.2</span>.jar
+    │   ├── commons-codec<span class="hljs-number">-1.4</span>.jar
+    ..... lots of jars
+    └── <span class="hljs-number">2.4</span><span class="hljs-number">.0</span>
+        ├── activation<span class="hljs-number">-1.1</span>.jar
+        ├── avro<span class="hljs-number">-1.7</span><span class="hljs-number">.4</span>.jar
+        ├── commons-beanutils<span class="hljs-number">-1.7</span><span class="hljs-number">.0</span>.jar
+        ├── commons-beanutils-core<span class="hljs-number">-1.8</span><span class="hljs-number">.0</span>.jar
+        ├── commons-cli<span class="hljs-number">-1.2</span>.jar
+        ├── commons-codec<span class="hljs-number">-1.4</span>.jar
+    ..... lots of jars
+</code></pre>
+<p>As you can see, under <code>hadoop-client</code>, there are two sub-directories, each denotes a version of <code>hadoop-client</code>.</p>
+<p>Next, use <code>hadoopDependencyCoordinates</code> in <a href="/docs/0.20.0/ingestion/hadoop.html">Hadoop Index Task</a> to specify the Hadoop dependencies you want Druid to load.</p>
+<p>For example, in your Hadoop Index Task spec file, you can write:</p>
+<p><code>&quot;hadoopDependencyCoordinates&quot;: [&quot;org.apache.hadoop:hadoop-client:2.4.0&quot;]</code></p>
+<p>This instructs Druid to load hadoop-client 2.4.0 when processing the task. What happens behind the scene is that Druid first looks for a folder
+called <code>hadoop-client</code> underneath <code>druid.extensions.hadoopDependenciesDir</code>, then looks for a folder called <code>2.4.0</code>
+underneath <code>hadoop-client</code>, and upon successfully locating these folders, hadoop-client 2.4.0 is loaded.</p>
+<h3><a class="anchor" aria-hidden="true" id="alternative-append-your-hadoop-jars-to-the-druid-classpath"></a><a href="#alternative-append-your-hadoop-jars-to-the-druid-classpath" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Alternative: Append your Hadoop jars to the Druid classpath</h3>
+<p>You can also load Hadoop client libraries in Druid's main classloader, rather than an isolated classloader. This
+mechanism is relatively easy to reason about, but it also means that you have to ensure that all dependency jars on the
+classpath are compatible. That is, Druid makes no provisions while using this method to maintain class loader isolation
+so you must make sure that the jars on your classpath are mutually compatible.</p>
+<ol>
+<li>Set <code>druid.indexer.task.defaultHadoopCoordinates=[]</code>. By setting this to an empty list, Druid will not load any other Hadoop dependencies except the ones specified in the classpath.</li>
+<li>Append your Hadoop jars to Druid's classpath. Druid will load them into the system.</li>
+</ol>
+<h2><a class="anchor" aria-hidden="true" id="notes-on-specific-hadoop-distributions"></a><a href="#notes-on-specific-hadoop-distributions" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Notes on specific Hadoop distributions</h2>
+<p>If the tips above do not solve any issues you are having with HDFS deep storage or Hadoop batch indexing, you may
+have luck with one of the following suggestions contributed by the Druid community.</p>
+<h3><a class="anchor" aria-hidden="true" id="cdh"></a><a href="#cdh" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>CDH</h3>
+<p>Members of the community have reported dependency conflicts between the version of Jackson used in CDH and Druid when running a Mapreduce job like:</p>
+<pre><code class="hljs">java.lang.VerifyError: <span class="hljs-keyword">class</span> com.fasterxml.jackson.datatype.guava.deser.HostAndPortDeserializer overrides <span class="hljs-keyword">final</span> <span class="hljs-function"><span class="hljs-keyword">method</span> <span class="hljs-title">deserialize</span>.<span class="hljs-params">(Lcom/fasterxml/jackson/core/JsonParser;Lcom/fasterxml/jackson/databind/DeserializationContext;)</span><span class="hljs-title">Ljava</span>/<span class="hljs-title">lang</span>/<span class="hljs-title">Object</span>;</span>
+</code></pre>
+<p><strong>Preferred workaround</strong></p>
+<p>First, try the tip under &quot;Classloader modification on Hadoop&quot; above. More recent versions of CDH have been reported to
+work with the classloader isolation option (<code>mapreduce.job.classloader = true</code>).</p>
+<p><strong>Alternate workaround - 1</strong></p>
+<p>You can try editing Druid's pom.xml dependencies to match the version of Jackson in your Hadoop version and recompile Druid.</p>
+<p>For more about building Druid, please see <a href="/docs/0.20.0/development/build.html">Building Druid</a>.</p>
+<p><strong>Alternate workaround - 2</strong></p>
+<p>Another workaround solution is to build a custom fat jar of Druid using <a href="http://www.scala-sbt.org/">sbt</a>, which manually excludes all the conflicting Jackson dependencies, and then put this fat jar in the classpath of the command that starts Overlord indexing service. To do this, please follow the following steps.</p>
+<p>(1) Download and install sbt.</p>
+<p>(2) Make a new directory named 'druid_build'.</p>
+<p>(3) Cd to 'druid_build' and create the build.sbt file with the content <a href="/docs/0.20.0/operations/use_sbt_to_build_fat_jar.html">here</a>.</p>
+<p>You can always add more building targets or remove the ones you don't need.</p>
+<p>(4) In the same directory create a new directory named 'project'.</p>
+<p>(5) Put the druid source code into 'druid_build/project'.</p>
+<p>(6) Create a file 'druid_build/project/assembly.sbt' with content as follows.</p>
+<pre><code class="hljs"><span class="hljs-function"><span class="hljs-title">addSbtPlugin</span><span class="hljs-params">(<span class="hljs-string">"com.eed3si9n"</span> % <span class="hljs-string">"sbt-assembly"</span> % <span class="hljs-string">"0.13.0"</span>)</span></span>
+</code></pre>
+<p>(7) In the 'druid_build' directory, run 'sbt assembly'.</p>
+<p>(8) In the 'druid_build/target/scala-2.10' folder, you will find the fat jar you just build.</p>
+<p>(9) Make sure the jars you've uploaded has been completely removed. The HDFS directory is by default '/tmp/druid-indexing/classpath'.</p>
+<p>(10) Include the fat jar in the classpath when you start the indexing service. Make sure you've removed 'lib/*' from your classpath because now the fat jar includes all you need.</p>
+<p><strong>Alternate workaround - 3</strong></p>
+<p>If sbt is not your choice, you can also use <code>maven-shade-plugin</code> to make a fat jar: relocation all Jackson packages will resolve it too. In this way, druid will not be affected by Jackson library embedded in hadoop. Please follow the steps below:</p>
+<p>(1) Add all extensions you needed to <code>services/pom.xml</code> like</p>
+<pre><code class="hljs css language-xml"><span class="hljs-tag">&lt;<span class="hljs-name">dependency</span>&gt;</span>
+     <span class="hljs-tag">&lt;<span class="hljs-name">groupId</span>&gt;</span>org.apache.druid.extensions<span class="hljs-tag">&lt;/<span class="hljs-name">groupId</span>&gt;</span>
+     <span class="hljs-tag">&lt;<span class="hljs-name">artifactId</span>&gt;</span>druid-avro-extensions<span class="hljs-tag">&lt;/<span class="hljs-name">artifactId</span>&gt;</span>
+     <span class="hljs-tag">&lt;<span class="hljs-name">version</span>&gt;</span>${project.parent.version}<span class="hljs-tag">&lt;/<span class="hljs-name">version</span>&gt;</span>
+ <span class="hljs-tag">&lt;/<span class="hljs-name">dependency</span>&gt;</span>
+
+ <span class="hljs-tag">&lt;<span class="hljs-name">dependency</span>&gt;</span>
+     <span class="hljs-tag">&lt;<span class="hljs-name">groupId</span>&gt;</span>org.apache.druid.extensions<span class="hljs-tag">&lt;/<span class="hljs-name">groupId</span>&gt;</span>
+     <span class="hljs-tag">&lt;<span class="hljs-name">artifactId</span>&gt;</span>druid-parquet-extensions<span class="hljs-tag">&lt;/<span class="hljs-name">artifactId</span>&gt;</span>
+     <span class="hljs-tag">&lt;<span class="hljs-name">version</span>&gt;</span>${project.parent.version}<span class="hljs-tag">&lt;/<span class="hljs-name">version</span>&gt;</span>
+ <span class="hljs-tag">&lt;/<span class="hljs-name">dependency</span>&gt;</span>
+
+ <span class="hljs-tag">&lt;<span class="hljs-name">dependency</span>&gt;</span>
+     <span class="hljs-tag">&lt;<span class="hljs-name">groupId</span>&gt;</span>org.apache.druid.extensions<span class="hljs-tag">&lt;/<span class="hljs-name">groupId</span>&gt;</span>
+     <span class="hljs-tag">&lt;<span class="hljs-name">artifactId</span>&gt;</span>druid-hdfs-storage<span class="hljs-tag">&lt;/<span class="hljs-name">artifactId</span>&gt;</span>
+     <span class="hljs-tag">&lt;<span class="hljs-name">version</span>&gt;</span>${project.parent.version}<span class="hljs-tag">&lt;/<span class="hljs-name">version</span>&gt;</span>
+ <span class="hljs-tag">&lt;/<span class="hljs-name">dependency</span>&gt;</span>
+
+ <span class="hljs-tag">&lt;<span class="hljs-name">dependency</span>&gt;</span>
+     <span class="hljs-tag">&lt;<span class="hljs-name">groupId</span>&gt;</span>org.apache.druid.extensions<span class="hljs-tag">&lt;/<span class="hljs-name">groupId</span>&gt;</span>
+     <span class="hljs-tag">&lt;<span class="hljs-name">artifactId</span>&gt;</span>mysql-metadata-storage<span class="hljs-tag">&lt;/<span class="hljs-name">artifactId</span>&gt;</span>
+     <span class="hljs-tag">&lt;<span class="hljs-name">version</span>&gt;</span>${project.parent.version}<span class="hljs-tag">&lt;/<span class="hljs-name">version</span>&gt;</span>
+ <span class="hljs-tag">&lt;/<span class="hljs-name">dependency</span>&gt;</span>
+</code></pre>
+<p>(2) Shade Jackson packages and assemble a fat jar.</p>
+<pre><code class="hljs css language-xml"><span class="hljs-tag">&lt;<span class="hljs-name">plugin</span>&gt;</span>
+     <span class="hljs-tag">&lt;<span class="hljs-name">groupId</span>&gt;</span>org.apache.maven.plugins<span class="hljs-tag">&lt;/<span class="hljs-name">groupId</span>&gt;</span>
+     <span class="hljs-tag">&lt;<span class="hljs-name">artifactId</span>&gt;</span>maven-shade-plugin<span class="hljs-tag">&lt;/<span class="hljs-name">artifactId</span>&gt;</span>
+     <span class="hljs-tag">&lt;<span class="hljs-name">executions</span>&gt;</span>
+         <span class="hljs-tag">&lt;<span class="hljs-name">execution</span>&gt;</span>
+             <span class="hljs-tag">&lt;<span class="hljs-name">phase</span>&gt;</span>package<span class="hljs-tag">&lt;/<span class="hljs-name">phase</span>&gt;</span>
+             <span class="hljs-tag">&lt;<span class="hljs-name">goals</span>&gt;</span>
+                 <span class="hljs-tag">&lt;<span class="hljs-name">goal</span>&gt;</span>shade<span class="hljs-tag">&lt;/<span class="hljs-name">goal</span>&gt;</span>
+             <span class="hljs-tag">&lt;/<span class="hljs-name">goals</span>&gt;</span>
+             <span class="hljs-tag">&lt;<span class="hljs-name">configuration</span>&gt;</span>
+                 <span class="hljs-tag">&lt;<span class="hljs-name">outputFile</span>&gt;</span>
+                     ${project.build.directory}/${project.artifactId}-${project.version}-selfcontained.jar
+                 <span class="hljs-tag">&lt;/<span class="hljs-name">outputFile</span>&gt;</span>
+                 <span class="hljs-tag">&lt;<span class="hljs-name">relocations</span>&gt;</span>
+                     <span class="hljs-tag">&lt;<span class="hljs-name">relocation</span>&gt;</span>
+                         <span class="hljs-tag">&lt;<span class="hljs-name">pattern</span>&gt;</span>com.fasterxml.jackson<span class="hljs-tag">&lt;/<span class="hljs-name">pattern</span>&gt;</span>
+                         <span class="hljs-tag">&lt;<span class="hljs-name">shadedPattern</span>&gt;</span>shade.com.fasterxml.jackson<span class="hljs-tag">&lt;/<span class="hljs-name">shadedPattern</span>&gt;</span>
+                     <span class="hljs-tag">&lt;/<span class="hljs-name">relocation</span>&gt;</span>
+                 <span class="hljs-tag">&lt;/<span class="hljs-name">relocations</span>&gt;</span>
+                 <span class="hljs-tag">&lt;<span class="hljs-name">artifactSet</span>&gt;</span>
+                     <span class="hljs-tag">&lt;<span class="hljs-name">includes</span>&gt;</span>
+                         <span class="hljs-tag">&lt;<span class="hljs-name">include</span>&gt;</span>*:*<span class="hljs-tag">&lt;/<span class="hljs-name">include</span>&gt;</span>
+                     <span class="hljs-tag">&lt;/<span class="hljs-name">includes</span>&gt;</span>
+                 <span class="hljs-tag">&lt;/<span class="hljs-name">artifactSet</span>&gt;</span>
+                 <span class="hljs-tag">&lt;<span class="hljs-name">filters</span>&gt;</span>
+                     <span class="hljs-tag">&lt;<span class="hljs-name">filter</span>&gt;</span>
+                         <span class="hljs-tag">&lt;<span class="hljs-name">artifact</span>&gt;</span>*:*<span class="hljs-tag">&lt;/<span class="hljs-name">artifact</span>&gt;</span>
+                         <span class="hljs-tag">&lt;<span class="hljs-name">excludes</span>&gt;</span>
+                             <span class="hljs-tag">&lt;<span class="hljs-name">exclude</span>&gt;</span>META-INF/*.SF<span class="hljs-tag">&lt;/<span class="hljs-name">exclude</span>&gt;</span>
+                             <span class="hljs-tag">&lt;<span class="hljs-name">exclude</span>&gt;</span>META-INF/*.DSA<span class="hljs-tag">&lt;/<span class="hljs-name">exclude</span>&gt;</span>
+                             <span class="hljs-tag">&lt;<span class="hljs-name">exclude</span>&gt;</span>META-INF/*.RSA<span class="hljs-tag">&lt;/<span class="hljs-name">exclude</span>&gt;</span>
+                         <span class="hljs-tag">&lt;/<span class="hljs-name">excludes</span>&gt;</span>
+                     <span class="hljs-tag">&lt;/<span class="hljs-name">filter</span>&gt;</span>
+                 <span class="hljs-tag">&lt;/<span class="hljs-name">filters</span>&gt;</span>
+                 <span class="hljs-tag">&lt;<span class="hljs-name">transformers</span>&gt;</span>
+                     <span class="hljs-tag">&lt;<span class="hljs-name">transformer</span> <span class="hljs-attr">implementation</span>=<span class="hljs-string">"org.apache.maven.plugins.shade.resource.ServicesResourceTransformer"</span>/&gt;</span>
+                 <span class="hljs-tag">&lt;/<span class="hljs-name">transformers</span>&gt;</span>
+             <span class="hljs-tag">&lt;/<span class="hljs-name">configuration</span>&gt;</span>
+         <span class="hljs-tag">&lt;/<span class="hljs-name">execution</span>&gt;</span>
+     <span class="hljs-tag">&lt;/<span class="hljs-name">executions</span>&gt;</span>
+ <span class="hljs-tag">&lt;/<span class="hljs-name">plugin</span>&gt;</span>
+</code></pre>
+<p>Copy out <code>services/target/xxxxx-selfcontained.jar</code> after <code>mvn install</code> in project root for further usage.</p>
+<p>(3) run hadoop indexer (post an indexing task is not possible now) as below. <code>lib</code> is not needed anymore. As hadoop indexer is a standalone tool, you don't have to replace the jars of your running services:</p>
+<pre><code class="hljs css language-bash">java -Xmx32m \
+  -Dfile.encoding=UTF-8 -Duser.timezone=UTC \
+  -classpath config/hadoop:config/overlord:config/_common:<span class="hljs-variable">$SELF_CONTAINED_JAR</span>:<span class="hljs-variable">$HADOOP_DISTRIBUTION</span>/etc/hadoop \
+  -Djava.security.krb5.conf=<span class="hljs-variable">$KRB5</span> \
+  org.apache.druid.cli.Main index hadoop \
+  <span class="hljs-variable">$config_path</span>
+</code></pre>
+</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/0.20.0/operations/alerts.html"><span class="arrow-prev">← </span><span>Alerts</span></a><a class="docs-next button" href="/docs/0.20.0/operations/http-compression.html"><span>HTTP compression</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#tip-1-place-hadoop-xmls-on-druid-classpath">Tip #1: Place Hadoop XMLs on Druid classpath</a></li><li><a href="#tip-2-classloader-modification-on-hadoop-mapreduce-jobs-only">Tip #2: Classloader modification on Hadoop (Map/Reduce jobs only)</a><ul class="toc-headings"><li><a href="#overriding-specific-classes">Overriding specific classes</a></li></ul></li><li><a href="#tip-3-use-specific-versions-of-hadoop-libraries">Tip #3: Use specific versions of Hadoop libraries</a><ul class="toc-headings"><li><a href="#preferred-load-using-druids-standard-mechanism">Preferred: Load using Druid's standard mechanism</a></li><li><a href="#alternative-append-your-hadoop-jars-to-the-druid-classpath">Alternative: Append your Hadoop jars to the Druid classpath</a></li></ul></li><li><a href="#notes-on-specific-hadoop-distributions">Notes on specific Hadoop distributions</a><ul class="toc-headings"><li><a href="#cdh">CDH</a></li></ul></li></ul></nav></div><footer class="nav-footer druid-footer" id="footer"><div class="container"><div class="text-center"><p><a href="/technology">Technology</a> · <a href="/use-cases">Use Cases</a> · <a href="/druid-powered">Powered by Druid</a> · <a href="/docs/0.20.0/latest">Docs</a> · <a href="/community/">Community</a> · <a href="/downloads.html">Download</a> · <a href="/faq">FAQ</a></p></div><div class="text-center"><a title="Join the user group" href="https://groups.google.com/forum/#!forum/druid-user" target="_blank"><span class="fa fa-comments"></span></a> · <a title="Follow Druid" href="https://twitter.com/druidio" target="_blank"><span class="fab fa-twitter"></span></a> · <a title="Download via Apache" href="https://www.apache.org/dyn/closer.cgi?path=/incubator/druid/{{ site.druid_versions[0].versions[0].version }}/apache-druid-{{ site.druid_versions[0].versions[0].version }}-bin.tar.gz" target="_blank"><span class="fas fa-feather"></span></a> · <a title="GitHub" href="https://github.com/apache/druid" target="_blank"><span class="fab fa-github"></span></a></div><div class="text-center license">Copyright © 2019 <a href="https://www.apache.org/" target="_blank">Apache Software Foundation</a>.<br/>Except where otherwise noted, licensed under <a rel="license" href="http://creativecommons.org/licenses/by-sa/4.0/">CC BY-SA 4.0</a>.<br/>Apache Druid, Druid, and the Druid logo are either registered trademarks or trademarks of The Apache Software Foundation in the United States and other countries.</div></div></footer></div><script type="text/javascript" src="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.js"></script><script>
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+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Password providers · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/0.20.0/operations/password-provider.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.20.0" /><meta property="og:title" content="Password providers · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
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class="icon-toc"></i></div></div><div class="navGroups"><div class="navGroup"><h3 class="navGroupCategoryTitle collapsible">Getting started<span class="arrow"><svg width="24" height="24" viewBox="0 0 24 24"><path fill="#565656" d="M7.41 15.41L12 10.83l4.59 4.58L18 14l-6-6-6 6z"></path><path d="M0 0h24v24H0z" fill="none"></path></svg></span></h3><ul class="hide"><li class="navListItem"><a class="navItem" href="/docs/0.20.0/design/index.html">Introduction to Apache Druid</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/tutorials/index.html">Quickstart</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/tutorials/docker.html">Docker</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/operations/single-server.html">Single server deployment</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/tutorials/cluster.html">Clustered deployment</a></li></ul></div><div class="navGroup"><h3 class="navGroupCategoryTitle collapsible">Tutorials<span class="arrow"><svg width="24" height="24" viewBox="0 0 24 24"><path fill="#565656" d="M7.41 15.41L12 10.83l4.59 4.58L18 14l-6-6-6 6z"></path><path d="M0 0h24v24H0z" fill="none"></path></svg></span></h3><ul class="hide"><li class="navListItem"><a class="navItem" href="/docs/0.20.0/tutorials/tutorial-batch.html">Loading files natively</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/tutorials/tutorial-kafka.html">Load from Apache Kafka</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/tutorials/tutorial-batch-hadoop.html">Load from Apache Hadoop</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/tutorials/tutorial-query.html">Querying data</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/tutorials/tutorial-rollup.html">Roll-up</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/tutorials/tutorial-retention.html">Configuring data retention</a></li><li 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href="/docs/0.20.0/ingestion/tranquility.html">Tranquility</a></li></ul></div><div class="navGroup subNavGroup"><h4 class="navGroupSubcategoryTitle">Batch ingestion</h4><ul><li class="navListItem"><a class="navItem" href="/docs/0.20.0/ingestion/native-batch.html">Native batch</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/ingestion/hadoop.html">Hadoop-based</a></li></ul></div><li class="navListItem"><a class="navItem" href="/docs/0.20.0/ingestion/tasks.html">Task reference</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/ingestion/faq.html">Troubleshooting FAQ</a></li></ul></div><div class="navGroup"><h3 class="navGroupCategoryTitle collapsible">Querying<span class="arrow"><svg width="24" height="24" viewBox="0 0 24 24"><path fill="#565656" d="M7.41 15.41L12 10.83l4.59 4.58L18 14l-6-6-6 6z"></path><path d="M0 0h24v24H0z" fill="none"></path></svg></span></h3><ul class="hide"><li class="navListItem"><a class="navItem" href="/docs/0.20.0/querying/sql.html">Druid SQL</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/querying/querying.html">Native queries</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/querying/query-execution.html">Query execution</a></li><div class="navGroup subNavGroup"><h4 class="navGroupSubcategoryTitle">Concepts</h4><ul><li class="navListItem"><a class="navItem" href="/docs/0.20.0/querying/datasource.html">Datasources</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/querying/joins.html">Joins</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/querying/lookups.html">Lookups</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/querying/multi-value-dimensions.html">Multi-value dimensions</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/querying/multitenancy.html">Multitenancy</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/querying/caching.html">Query caching</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/querying/query-context.html">Context parameters</a></li></ul></div><div class="navGroup subNavGroup"><h4 class="navGroupSubcategoryTitle">Native query types</h4><ul><li class="navListItem"><a class="navItem" href="/docs/0.20.0/querying/timeseriesquery.html">Timeseries</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/querying/topnquery.html">TopN</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/querying/groupbyquery.html">GroupBy</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/querying/scan-query.html">Scan</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/querying/searchquery.html">Search</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/querying/timeboundaryquery.html">TimeBoundary</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/querying/segmentmetadataquery.html">SegmentMetadata</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/querying/datasourcemetadataquery.html">DatasourceMetadata</a></li></ul></div><div class="navGroup subNavGroup"><h4 class="navGroupSubcategoryTitle">Native query components</h4><ul><li class="navListItem"><a class="navItem" href="/docs/0.20.0/querying/filters.html">Filters</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/querying/granularities.html">Granularities</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/querying/dimensionspecs.html">Dimensions</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/querying/aggregations.html">Aggregations</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/querying/post-aggregations.html">Post-aggregations</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/misc/math-expr.html">Expressions</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/querying/having.html">Having filters (groupBy)</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/querying/limitspec.html">Sorting and limiting (groupBy)</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/querying/topnmetricspec.html">Sorting (topN)</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/querying/sorting-orders.html">String comparators</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/querying/virtual-columns.html">Virtual columns</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/geo.html">Spatial filters</a></li></ul></div></ul></div><div class="navGroup"><h3 class="navGroupCategoryTitle collapsible">Configuration<span class="arrow"><svg width="24" height="24" viewBox="0 0 24 24"><path fill="#565656" d="M7.41 15.41L12 10.83l4.59 4.58L18 14l-6-6-6 6z"></path><path d="M0 0h24v24H0z" fill="none"></path></svg></span></h3><ul class="hide"><li class="navListItem"><a class="navItem" href="/docs/0.20.0/configuration/index.html">Configuration reference</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions.html">Extensions</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/configuration/logging.html">Logging</a></li></ul></div><div class="navGroup"><h3 class="navGroupCategoryTitle collapsible">Operations<span class="arrow"><svg width="24" height="24" viewBox="0 0 24 24"><path fill="#565656" d="M7.41 15.41L12 10.83l4.59 4.58L18 14l-6-6-6 6z"></path><path d="M0 0h24v24H0z" fill="none"></path></svg></span></h3><ul class="hide"><li class="navListItem"><a class="navItem" href="/docs/0.20.0/operations/druid-console.html">Web console</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/operations/getting-started.html">Getting started with Apache Druid</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/operations/basic-cluster-tuning.html">Basic cluster tuning</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/operations/api-reference.html">API reference</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/operations/high-availability.html">High availability</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/operations/rolling-updates.html">Rolling updates</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/operations/rule-configuration.html">Retaining or automatically dropping data</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/operations/metrics.html">Metrics</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/operations/alerts.html">Alerts</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/operations/other-hadoop.html">Working with different versions of Apache Hadoop</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/operations/http-compression.html">HTTP compression</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/operations/tls-support.html">TLS support</a></li><li class="navListItem navListItemActive"><a class="navItem" href="/docs/0.20.0/operations/password-provider.html">Password providers</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/operations/dump-segment.html">dump-segment tool</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/operations/reset-cluster.html">reset-cluster tool</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/operations/insert-segment-to-db.html">insert-segment-to-db tool</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/operations/pull-deps.html">pull-deps tool</a></li><div class="navGroup subNavGroup"><h4 class="navGroupSubcategoryTitle">Misc</h4><ul><li class="navListItem"><a class="navItem" href="/docs/0.20.0/operations/management-uis.html">Legacy Management UIs</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/operations/deep-storage-migration.html">Deep storage migration</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/operations/export-metadata.html">Export Metadata Tool</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/operations/metadata-migration.html">Metadata Migration</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/operations/segment-optimization.html">Segment Size Optimization</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/operations/use_sbt_to_build_fat_jar.html">Content for build.sbt</a></li></ul></div></ul></div><div class="navGroup"><h3 class="navGroupCategoryTitle collapsible">Development<span class="arrow"><svg width="24" height="24" viewBox="0 0 24 24"><path fill="#565656" d="M7.41 15.41L12 10.83l4.59 4.58L18 14l-6-6-6 6z"></path><path d="M0 0h24v24H0z" fill="none"></path></svg></span></h3><ul class="hide"><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/overview.html">Developing on Druid</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/modules.html">Creating extensions</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/javascript.html">JavaScript functionality</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/build.html">Build from source</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/versioning.html">Versioning</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/experimental.html">Experimental features</a></li></ul></div><div class="navGroup"><h3 class="navGroupCategoryTitle collapsible">Misc<span class="arrow"><svg width="24" height="24" viewBox="0 0 24 24"><path fill="#565656" d="M7.41 15.41L12 10.83l4.59 4.58L18 14l-6-6-6 6z"></path><path d="M0 0h24v24H0z" fill="none"></path></svg></span></h3><ul class="hide"><li class="navListItem"><a class="navItem" href="/docs/0.20.0/misc/papers-and-talks.html">Papers</a></li></ul></div><div class="navGroup"><h3 class="navGroupCategoryTitle collapsible">Hidden<span class="arrow"><svg width="24" height="24" viewBox="0 0 24 24"><path fill="#565656" d="M7.41 15.41L12 10.83l4.59 4.58L18 14l-6-6-6 6z"></path><path d="M0 0h24v24H0z" fill="none"></path></svg></span></h3><ul class="hide"><li class="navListItem"><a class="navItem" href="/docs/0.20.0/comparisons/druid-vs-elasticsearch.html">Apache Druid vs Elasticsearch</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/comparisons/druid-vs-key-value.html">Apache Druid vs. Key/Value Stores (HBase/Cassandra/OpenTSDB)</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/comparisons/druid-vs-kudu.html">Apache Druid vs Kudu</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/comparisons/druid-vs-redshift.html">Apache Druid vs Redshift</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/comparisons/druid-vs-spark.html">Apache Druid vs Spark</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/comparisons/druid-vs-sql-on-hadoop.html">Apache Druid vs SQL-on-Hadoop</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/design/auth.html">Authentication and Authorization</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/design/broker.html">Broker</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/design/coordinator.html">Coordinator Process</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/design/historical.html">Historical Process</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/design/indexer.html">Indexer Process</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/design/indexing-service.html">Indexing Service</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/design/middlemanager.html">MiddleManager Process</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/design/overlord.html">Overlord Process</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/design/router.html">Router Process</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/design/peons.html">Peons</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-core/approximate-histograms.html">Approximate Histogram aggregators</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-core/avro.html">Apache Avro</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-core/azure.html">Microsoft Azure</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-core/bloom-filter.html">Bloom Filter</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-core/datasketches-extension.html">DataSketches extension</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-core/datasketches-hll.html">DataSketches HLL Sketch module</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-core/datasketches-quantiles.html">DataSketches Quantiles Sketch module</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-core/datasketches-theta.html">DataSketches Theta Sketch module</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-core/datasketches-tuple.html">DataSketches Tuple Sketch module</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-core/druid-basic-security.html">Basic Security</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-core/druid-kerberos.html">Kerberos</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-core/druid-lookups.html">Cached Lookup Module</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-core/druid-ranger-security.html">Apache Ranger Security</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-core/google.html">Google Cloud Storage</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-core/hdfs.html">HDFS</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-core/kafka-extraction-namespace.html">Apache Kafka Lookups</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-core/lookups-cached-global.html">Globally Cached Lookups</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-core/mysql.html">MySQL Metadata Store</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-core/orc.html">ORC Extension</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-core/druid-pac4j.html">Druid pac4j based Security extension</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-core/parquet.html">Apache Parquet Extension</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-core/postgresql.html">PostgreSQL Metadata Store</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-core/protobuf.html">Protobuf</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-core/s3.html">S3-compatible</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-core/simple-client-sslcontext.html">Simple SSLContext Provider Module</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-core/stats.html">Stats aggregator</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-core/test-stats.html">Test Stats Aggregators</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-contrib/ambari-metrics-emitter.html">Ambari Metrics Emitter</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-contrib/cassandra.html">Apache Cassandra</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-contrib/cloudfiles.html">Rackspace Cloud Files</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-contrib/distinctcount.html">DistinctCount Aggregator</a></li><li class="navListItem"><a class="navItem" 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+        </script></nav></div><div class="container mainContainer docsContainer"><div class="wrapper"><div class="post"><header class="postHeader"><a class="edit-page-link button" href="https://github.com/apache/druid/edit/master/docs/operations/password-provider.md" target="_blank" rel="noreferrer noopener">Edit</a><h1 id="__docusaurus" class="postHeaderTitle">Password providers</h1></header><article><div><span><!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
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+<p>Apache Druid needs some passwords for accessing various secured systems like metadata store, Key Store containing server certificates etc.
+All these passwords have corresponding runtime properties associated with them, for example <code>druid.metadata.storage.connector.password</code> corresponds to the metadata store password.</p>
+<p>By default users can directly set the passwords in plaintext for these runtime properties, for example <code>druid.metadata.storage.connector.password=pwd</code> sets the metadata store password
+to be used by Druid to connect to metadata store to <code>pwd</code>. Apart from this, users can use environment variables to get password in following way -</p>
+<p>Environment variable password provider provides password by looking at specified environment variable. Use this in order to avoid specifying password in runtime.properties file.
+e.g</p>
+<pre><code class="hljs css language-json">druid.metadata.storage.connector.password={ "type": "environment", "variable": "METADATA_STORAGE_PASSWORD" }
+</code></pre>
+<p>The values are described below.</p>
+<table>
+<thead>
+<tr><th>Field</th><th>Type</th><th>Description</th><th>Required</th></tr>
+</thead>
+<tbody>
+<tr><td><code>type</code></td><td>String</td><td>password provider type</td><td>Yes: <code>environment</code></td></tr>
+<tr><td><code>variable</code></td><td>String</td><td>environment variable to read password from</td><td>Yes</td></tr>
+</tbody>
+</table>
+<p>However, many times users may want their own way to optionally securely fetch password during runtime of the Druid process.
+Druid allows this by users to implement their own <code>PasswordProvider</code> interface and create a Druid extension to register this implementation at Druid process startup.
+Please have a look at &quot;Adding a new Password Provider implementation&quot; on this <a href="/docs/0.20.0/development/modules.html">page</a> to learn more.</p>
+<p>To use this implementation, simply set the relevant password runtime property to something similar as was done for Environment variable password provider like -</p>
+<pre><code class="hljs css language-json">druid.metadata.storage.connector.password={ "type": "&lt;registered_password_provider_name&gt;", "&lt;jackson_property&gt;": "&lt;value&gt;", ... }
+</code></pre>
+</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/0.20.0/operations/tls-support.html"><span class="arrow-prev">← </span><span>TLS support</span></a><a class="docs-next button" href="/docs/0.20.0/operations/dump-segment.html"><span>dump-segment tool</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"></nav></div><footer class="nav-footer druid-footer" id="footer"><div class="container"><div class="text-center"><p><a href="/technology">Technology</a> · <a href="/use-cases">Use Cases</a> · <a href="/druid-powered">Powered by Druid</a> · <a href="/docs/0.20.0/latest">Docs</a> · <a href="/community/">Community</a> · <a href="/downloads.html">Download</a> · <a href="/faq">FAQ</a></p></div><div class="text-center"><a title="Join the user group" href="https://groups.google.com/forum/#!forum/druid-user" target="_blank"><span class="fa fa-comments"></span></a> · <a title="Follow Druid" href="https://twitter.com/druidio" target="_blank"><span class="fab fa-twitter"></span></a> · <a title="Download via Apache" href="https://www.apache.org/dyn/closer.cgi?path=/incubator/druid/{{ site.druid_versions[0].versions[0].version }}/apache-druid-{{ site.druid_versions[0].versions[0].version }}-bin.tar.gz" target="_blank"><span class="fas fa-feather"></span></a> · <a title="GitHub" href="https://github.com/apache/druid" target="_blank"><span class="fab fa-github"></span></a></div><div class="text-center license">Copyright © 2019 <a href="https://www.apache.org/" target="_blank">Apache Software Foundation</a>.<br/>Except where otherwise noted, licensed under <a rel="license" href="http://creativecommons.org/licenses/by-sa/4.0/">CC BY-SA 4.0</a>.<br/>Apache Druid, Druid, and the Druid logo are either registered trademarks or trademarks of The Apache Software Foundation in the United States and other countries.</div></div></footer></div><script type="text/javascript" src="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.js"></script><script>
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+  ~ Licensed to the Apache Software Foundation (ASF) under one
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+<p><code>pull-deps</code> is an Apache Druid tool that can pull down dependencies to the local repository and lay dependencies out into the extension directory as needed.</p>
+<p><code>pull-deps</code> has several command line options, they are as follows:</p>
+<p><code>-c</code> or <code>--coordinate</code> (Can be specified multiple times)</p>
+<p>Extension coordinate to pull down, followed by a maven coordinate, e.g. org.apache.druid.extensions:mysql-metadata-storage</p>
+<p><code>-h</code> or <code>--hadoop-coordinate</code> (Can be specified multiply times)</p>
+<p>Apache Hadoop dependency to pull down, followed by a maven coordinate, e.g. org.apache.hadoop:hadoop-client:2.4.0</p>
+<p><code>--no-default-hadoop</code></p>
+<p>Don't pull down the default hadoop coordinate, i.e., org.apache.hadoop:hadoop-client:2.3.0. If <code>-h</code> option is supplied, then default hadoop coordinate will not be downloaded.</p>
+<p><code>--clean</code></p>
+<p>Remove existing extension and hadoop dependencies directories before pulling down dependencies.</p>
+<p><code>-l</code> or <code>--localRepository</code></p>
+<p>A local repository that Maven will use to put downloaded files. Then pull-deps will lay these files out into the extensions directory as needed.</p>
+<p><code>-r</code> or <code>--remoteRepository</code></p>
+<p>Add a remote repository. Unless --no-default-remote-repositories is provided, these will be used after <a href="https://repo1.maven.org/maven2/">https://repo1.maven.org/maven2/</a> and <a href="https://metamx.artifactoryonline.com/metamx/pub-libs-releases-local">https://metamx.artifactoryonline.com/metamx/pub-libs-releases-local</a></p>
+<p><code>--no-default-remote-repositories</code></p>
+<p>Don't use the default remote repositories, only use the repositories provided directly via --remoteRepository.</p>
+<p><code>-d</code> or <code>--defaultVersion</code></p>
+<p>Version to use for extension coordinate that doesn't have a version information. For example, if extension coordinate is <code>org.apache.druid.extensions:mysql-metadata-storage</code>, and default version is <code>0.20.0</code>, then this coordinate will be treated as <code>org.apache.druid.extensions:mysql-metadata-storage:0.20.0</code></p>
+<p><code>--use-proxy</code></p>
+<p>Use http/https proxy to send request to the remote repository servers. <code>--proxy-host</code> and <code>--proxy-port</code> must be set explicitly if this option is enabled.</p>
+<p><code>--proxy-type</code></p>
+<p>Set the proxy type, Should be either <em>http</em> or <em>https</em>, default value is <em>https</em>.</p>
+<p><code>--proxy-host</code></p>
+<p>Set the proxy host. e.g. proxy.com.</p>
+<p><code>--proxy-port</code></p>
+<p>Set the proxy port number. e.g. 8080.</p>
+<p><code>--proxy-username</code></p>
+<p>Set a username to connect to the proxy, this option is only required if the proxy server uses authentication.</p>
+<p><code>--proxy-password</code></p>
+<p>Set a password to connect to the proxy, this option is only required if the proxy server uses authentication.</p>
+<p>To run <code>pull-deps</code>, you should</p>
+<ol>
+<li><p>Specify <code>druid.extensions.directory</code> and <code>druid.extensions.hadoopDependenciesDir</code>, these two properties tell <code>pull-deps</code> where to put extensions. If you don't specify them,  default values will be used, see <a href="/docs/0.20.0/configuration/index.html">Configuration</a>.</p></li>
+<li><p>Tell <code>pull-deps</code> what to download using <code>-c</code> or <code>-h</code> option, which are followed by a maven coordinate.</p></li>
+</ol>
+<p>Example:</p>
+<p>Suppose you want to download <code>mysql-metadata-storage</code> and <code>hadoop-client</code>(both 2.3.0 and 2.4.0) with a specific version, you can run <code>pull-deps</code> command with <code>-c org.apache.druid.extensions:mysql-metadata-storage:0.20.0</code>, <code>-h org.apache.hadoop:hadoop-client:2.3.0</code> and <code>-h org.apache.hadoop:hadoop-client:2.4.0</code>, an example command would be:</p>
+<pre><code class="hljs">java -classpath <span class="hljs-string">"/my/druid/lib/*"</span> org<span class="hljs-selector-class">.apache</span><span class="hljs-selector-class">.druid</span><span class="hljs-selector-class">.cli</span><span class="hljs-selector-class">.Main</span> tools pull-deps --clean -c org<span class="hljs-selector-class">.apache</span><span class="hljs-selector-class">.druid</span><span class="hljs-selector-class">.extensions</span>:mysql-metadata-storage:0.20.0 -h org<span class="hljs-selector-class">.apache</span><span class="hljs-selector-class">.hadoop</span>:hadoop-client:<span class="hljs-number">2.3</span>.<span class="hljs-number">0</span> -h org<span class="hljs-selector-class">.apache</span><span class="hljs-selector-class">.hadoop</span>:hadoop-client:<span class="hljs-number">2.4</span>.<span class="hljs-number">0</span>
+</code></pre>
+<p>Because <code>--clean</code> is supplied, this command will first remove the directories specified at <code>druid.extensions.directory</code> and <code>druid.extensions.hadoopDependenciesDir</code>, then recreate them and start downloading the extensions there. After finishing downloading, if you go to the extension directories you specified, you will see</p>
+<pre><code class="hljs">tree <span class="hljs-keyword">extensions
+</span><span class="hljs-keyword">extensions
+</span>└── mysql-metadata-storage
+    └── mysql-metadata-storage-0.20.0.<span class="hljs-keyword">jar
+</span></code></pre>
+<pre><code class="hljs">tree hadoop-dependencies
+hadoop-dependencies/
+└── hadoop-client
+    ├── <span class="hljs-number">2.3</span><span class="hljs-number">.0</span>
+    │   ├── activation<span class="hljs-number">-1.1</span>.jar
+    │   ├── avro<span class="hljs-number">-1.7</span><span class="hljs-number">.4</span>.jar
+    │   ├── commons-beanutils<span class="hljs-number">-1.7</span><span class="hljs-number">.0</span>.jar
+    │   ├── commons-beanutils-core<span class="hljs-number">-1.8</span><span class="hljs-number">.0</span>.jar
+    │   ├── commons-cli<span class="hljs-number">-1.2</span>.jar
+    │   ├── commons-codec<span class="hljs-number">-1.4</span>.jar
+    ..... lots of jars
+    └── <span class="hljs-number">2.4</span><span class="hljs-number">.0</span>
+        ├── activation<span class="hljs-number">-1.1</span>.jar
+        ├── avro<span class="hljs-number">-1.7</span><span class="hljs-number">.4</span>.jar
+        ├── commons-beanutils<span class="hljs-number">-1.7</span><span class="hljs-number">.0</span>.jar
+        ├── commons-beanutils-core<span class="hljs-number">-1.8</span><span class="hljs-number">.0</span>.jar
+        ├── commons-cli<span class="hljs-number">-1.2</span>.jar
+        ├── commons-codec<span class="hljs-number">-1.4</span>.jar
+    ..... lots of jars
+</code></pre>
+<p>Note that if you specify <code>--defaultVersion</code>, you don't have to put version information in the coordinate. For example, if you want <code>mysql-metadata-storage</code> to use version <code>0.20.0</code>,  you can change the command above to</p>
+<pre><code class="hljs">java -classpath <span class="hljs-string">"/my/druid/lib/*"</span> org<span class="hljs-selector-class">.apache</span><span class="hljs-selector-class">.druid</span><span class="hljs-selector-class">.cli</span><span class="hljs-selector-class">.Main</span> tools pull-deps --defaultVersion 0.20.0 --clean -c org<span class="hljs-selector-class">.apache</span><span class="hljs-selector-class">.druid</span><span class="hljs-selector-class">.extensions</span>:mysql-metadata-storage -h org<span class="hljs-selector-class">.apache</span><span class="hljs-selector-class">.hadoop</span>:hadoop-client:<span class="hljs-number">2.3</span>.<span class="hljs-number">0</span> -h org<span class="hljs-selector-class">.apache</span><span class="hljs-selector-class">.hadoop</span>:hadoop-client:<span class="hljs-number">2.4</span>.<span class="hljs-number">0</span>
+</code></pre>
+<blockquote>
+<p>Please note to use the pull-deps tool you must know the Maven groupId, artifactId, and version of your extension.</p>
+<p>For Druid community extensions listed <a href="/docs/0.20.0/development/extensions.html">here</a>, the groupId is &quot;org.apache.druid.extensions.contrib&quot; and the artifactId is the name of the extension.</p>
+</blockquote>
+</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/0.20.0/operations/insert-segment-to-db.html"><span class="arrow-prev">← </span><span>insert-segment-to-db tool</span></a><a class="docs-next button" href="/docs/0.20.0/operations/management-uis.html"><span>Legacy Management UIs</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"></nav></div><footer class="nav-footer druid-footer" id="footer"><div class="container"><div class="text-center"><p><a href="/technology">Technology</a> · <a href="/use-cases">Use Cases</a> · <a href="/druid-powered">Powered by Druid</a> · <a href="/docs/0.20.0/latest">Docs</a> · <a href="/community/">Community</a> · <a href="/downloads.html">Download</a> · <a href="/faq">FAQ</a></p></div><div class="text-center"><a title="Join the user group" href="https://groups.google.com/forum/#!forum/druid-user" target="_blank"><span class="fa fa-comments"></span></a> · <a title="Follow Druid" href="https://twitter.com/druidio" target="_blank"><span class="fab fa-twitter"></span></a> · <a title="Download via Apache" href="https://www.apache.org/dyn/closer.cgi?path=/incubator/druid/{{ site.druid_versions[0].versions[0].version }}/apache-druid-{{ site.druid_versions[0].versions[0].version }}-bin.tar.gz" target="_blank"><span class="fas fa-feather"></span></a> · <a title="GitHub" href="https://github.com/apache/druid" target="_blank"><span class="fab fa-github"></span></a></div><div class="text-center license">Copyright © 2019 <a href="https://www.apache.org/" target="_blank">Apache Software Foundation</a>.<br/>Except where otherwise noted, licensed under <a rel="license" href="http://creativecommons.org/licenses/by-sa/4.0/">CC BY-SA 4.0</a>.<br/>Apache Druid, Druid, and the Druid logo are either registered trademarks or trademarks of The Apache Software Foundation in the United States and other countries.</div></div></footer></div><script type="text/javascript" src="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.js"></script><script>
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+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>reset-cluster tool · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/0.20.0/operations/reset-cluster.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.20.0" /><meta property="og:title" content="reset-cluster tool · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
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+        </script></nav></div><div class="container mainContainer docsContainer"><div class="wrapper"><div class="post"><header class="postHeader"><a class="edit-page-link button" href="https://github.com/apache/druid/edit/master/docs/operations/reset-cluster.md" target="_blank" rel="noreferrer noopener">Edit</a><h1 id="__docusaurus" class="postHeaderTitle">reset-cluster tool</h1></header><article><div><span><!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
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+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+  -->
+<p>The <code>reset-cluster</code> tool can be used to completely wipe out Apache Druid cluster state stored on Metadata and Deep storage. This is
+intended to be used in dev/test environments where you typically want to reset the cluster before running
+the test suite.
+<code>reset-cluster</code> automatically figures out necessary information from Druid cluster configuration. So the java classpath
+used in the command must have all the necessary druid configuration files.</p>
+<p>It can be run in one of the following ways.</p>
+<pre><code class="hljs"><span class="hljs-selector-tag">java</span> <span class="hljs-selector-tag">org</span><span class="hljs-selector-class">.apache</span><span class="hljs-selector-class">.druid</span><span class="hljs-selector-class">.cli</span><span class="hljs-selector-class">.Main</span> <span class="hljs-selector-tag">tools</span> <span class="hljs-selector-tag">reset-cluster</span> <span class="hljs-selector-attr">[--metadataStore]</span> <span class="hljs-selector-attr">[--segmentFiles]</span> <span class="hljs-selector-attr">[--taskLogs]</span> <span class="hljs-selector-attr">[--hadoopWorkingPath]</span>
+</code></pre>
+<p>or</p>
+<pre><code class="hljs"><span class="hljs-selector-tag">java</span> <span class="hljs-selector-tag">org</span><span class="hljs-selector-class">.apache</span><span class="hljs-selector-class">.druid</span><span class="hljs-selector-class">.cli</span><span class="hljs-selector-class">.Main</span> <span class="hljs-selector-tag">tools</span> <span class="hljs-selector-tag">reset-cluster</span> <span class="hljs-selector-tag">--all</span>
+</code></pre>
+<p>Usage documentation can be printed by running following command.</p>
+<pre><code class="hljs">$ java org.apache.druid.cli.Main help tools <span class="hljs-keyword">reset</span>-<span class="hljs-keyword">cluster</span>
+
+<span class="hljs-type">NAME</span>
+        druid tools <span class="hljs-keyword">reset</span>-<span class="hljs-keyword">cluster</span> - Cleanup <span class="hljs-keyword">all</span> persisted state <span class="hljs-keyword">from</span> metadata
+        <span class="hljs-keyword">and</span> deep <span class="hljs-keyword">storage</span>.
+
+SYNOPSIS
+        druid tools <span class="hljs-keyword">reset</span>-<span class="hljs-keyword">cluster</span> [<span class="hljs-comment">--all] [--hadoopWorkingPath]</span>
+                [<span class="hljs-comment">--metadataStore] [--segmentFiles] [--taskLogs]</span>
+
+<span class="hljs-keyword">OPTIONS</span>
+        <span class="hljs-comment">--all</span>
+            <span class="hljs-keyword">delete</span> <span class="hljs-keyword">all</span> state stored <span class="hljs-keyword">in</span> metadata <span class="hljs-keyword">and</span> deep <span class="hljs-keyword">storage</span>
+
+        <span class="hljs-comment">--hadoopWorkingPath</span>
+            <span class="hljs-keyword">delete</span> hadoopWorkingPath
+
+        <span class="hljs-comment">--metadataStore</span>
+            <span class="hljs-keyword">delete</span> <span class="hljs-keyword">all</span> records <span class="hljs-keyword">in</span> metadata <span class="hljs-keyword">storage</span>
+
+        <span class="hljs-comment">--segmentFiles</span>
+            <span class="hljs-keyword">delete</span> <span class="hljs-keyword">all</span> segment files <span class="hljs-keyword">from</span> deep <span class="hljs-keyword">storage</span>
+
+        <span class="hljs-comment">--taskLogs</span>
+            <span class="hljs-keyword">delete</span> <span class="hljs-keyword">all</span> tasklogs
+</code></pre>
+</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/0.20.0/operations/dump-segment.html"><span class="arrow-prev">← </span><span>dump-segment tool</span></a><a class="docs-next button" href="/docs/0.20.0/operations/insert-segment-to-db.html"><span>insert-segment-to-db tool</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"></nav></div><footer class="nav-footer druid-footer" id="footer"><div class="container"><div class="text-center"><p><a href="/technology">Technology</a> · <a href="/use-cases">Use Cases</a> · <a href="/druid-powered">Powered by Druid</a> · <a href="/docs/0.20.0/latest">Docs</a> · <a href="/community/">Community</a> · <a href="/downloads.html">Download</a> · <a href="/faq">FAQ</a></p></div><div class="text-center"><a title="Join the user group" href="https://groups.google.com/forum/#!forum/druid-user" target="_blank"><span class="fa fa-comments"></span></a> · <a title="Follow Druid" href="https://twitter.com/druidio" target="_blank"><span class="fab fa-twitter"></span></a> · <a title="Download via Apache" href="https://www.apache.org/dyn/closer.cgi?path=/incubator/druid/{{ site.druid_versions[0].versions[0].version }}/apache-druid-{{ site.druid_versions[0].versions[0].version }}-bin.tar.gz" target="_blank"><span class="fas fa-feather"></span></a> · <a title="GitHub" href="https://github.com/apache/druid" target="_blank"><span class="fab fa-github"></span></a></div><div class="text-center license">Copyright © 2019 <a href="https://www.apache.org/" target="_blank">Apache Software Foundation</a>.<br/>Except where otherwise noted, licensed under <a rel="license" href="http://creativecommons.org/licenses/by-sa/4.0/">CC BY-SA 4.0</a>.<br/>Apache Druid, Druid, and the Druid logo are either registered trademarks or trademarks of The Apache Software Foundation in the United States and other countries.</div></div></footer></div><script type="text/javascript" src="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.js"></script><script>
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+<p>For rolling Apache Druid cluster updates with no downtime, we recommend updating Druid processes in the
+following order:</p>
+<ol>
+<li>Historical</li>
+<li>*Overlord (if any)</li>
+<li>*Middle Manager/Indexers (if any)</li>
+<li>Standalone Real-time (if any)</li>
+<li>Broker</li>
+<li>Coordinator ( or merged Coordinator+Overlord )</li>
+</ol>
+<p>* In 0.12.0, there are protocol changes between the Kafka supervisor and Kafka Indexing task and also some changes to the metadata formats persisted on disk. Therefore, to support rolling upgrade, all the Middle Managers will need to be upgraded first before the Overlord. Note that this ordering is different from the standard order of upgrade, also note that this ordering is only necessary when using the Kafka Indexing Service. If one is not using Kafka Indexing Service or can handle down time for Kafka Supervisor then one can upgrade in any order.</p>
+<h2><a class="anchor" aria-hidden="true" id="historical"></a><a href="#historical" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Historical</h2>
+<p>Historical processes can be updated one at a time. Each Historical process has a startup time to memory map
+all the segments it was serving before the update. The startup time typically takes a few seconds to
+a few minutes, depending on the hardware of the host. As long as each Historical process is updated
+with a sufficient delay (greater than the time required to start a single process), you can rolling
+update the entire Historical cluster.</p>
+<h2><a class="anchor" aria-hidden="true" id="overlord"></a><a href="#overlord" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Overlord</h2>
+<p>Overlord processes can be updated one at a time in a rolling fashion.</p>
+<h2><a class="anchor" aria-hidden="true" id="middle-managersindexers"></a><a href="#middle-managersindexers" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Middle Managers/Indexers</h2>
+<p>Middle Managers or Indexer nodes run both batch and real-time indexing tasks. Generally you want to update Middle
+Managers in such a way that real-time indexing tasks do not fail. There are three strategies for
+doing that.</p>
+<h3><a class="anchor" aria-hidden="true" id="rolling-restart-restore-based"></a><a href="#rolling-restart-restore-based" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Rolling restart (restore-based)</h3>
+<p>Middle Managers can be updated one at a time in a rolling fashion when you set
+<code>druid.indexer.task.restoreTasksOnRestart=true</code>. In this case, indexing tasks that support restoring
+will restore their state on Middle Manager restart, and will not fail.</p>
+<p>Currently, only realtime tasks support restoring, so non-realtime indexing tasks will fail and will
+need to be resubmitted.</p>
+<h3><a class="anchor" aria-hidden="true" id="rolling-restart-graceful-termination-based"></a><a href="#rolling-restart-graceful-termination-based" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Rolling restart (graceful-termination-based)</h3>
+<p>Middle Managers can be gracefully terminated using the &quot;disable&quot; API. This works for all task types,
+even tasks that are not restorable.</p>
+<p>To prepare a Middle Manager for update, send a POST request to
+<code>&lt;MiddleManager_IP:PORT&gt;/druid/worker/v1/disable</code>. The Overlord will now no longer send tasks to
+this Middle Manager. Tasks that have already started will run to completion. Current state can be checked
+using <code>&lt;MiddleManager_IP:PORT&gt;/druid/worker/v1/enabled</code> .</p>
+<p>To view all existing tasks, send a GET request to <code>&lt;MiddleManager_IP:PORT&gt;/druid/worker/v1/tasks</code>.
+When this list is empty, you can safely update the Middle Manager. After the Middle Manager starts
+back up, it is automatically enabled again. You can also manually enable Middle Managers by POSTing
+to <code>&lt;MiddleManager_IP:PORT&gt;/druid/worker/v1/enable</code>.</p>
+<h3><a class="anchor" aria-hidden="true" id="autoscaling-based-replacement"></a><a href="#autoscaling-based-replacement" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Autoscaling-based replacement</h3>
+<p>If autoscaling is enabled on your Overlord, then Overlord processes can launch new Middle Manager processes
+en masse and then gracefully terminate old ones as their tasks finish. This process is configured by
+setting <code>druid.indexer.runner.minWorkerVersion=#{VERSION}</code>. Each time you update your Overlord process,
+the <code>VERSION</code> value should be increased, which will trigger a mass launch of new Middle Managers.</p>
+<p>The config <code>druid.indexer.autoscale.workerVersion=#{VERSION}</code> also needs to be set.</p>
+<h2><a class="anchor" aria-hidden="true" id="standalone-real-time"></a><a href="#standalone-real-time" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Standalone Real-time</h2>
+<p>Standalone real-time processes can be updated one at a time in a rolling fashion.</p>
+<h2><a class="anchor" aria-hidden="true" id="broker"></a><a href="#broker" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Broker</h2>
+<p>Broker processes can be updated one at a time in a rolling fashion. There needs to be some delay between
+updating each process as Brokers must load the entire state of the cluster before they return valid
+results.</p>
+<h2><a class="anchor" aria-hidden="true" id="coordinator"></a><a href="#coordinator" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Coordinator</h2>
+<p>Coordinator processes can be updated one at a time in a rolling fashion.</p>
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+        </script></nav></div><div class="container mainContainer docsContainer"><div class="wrapper"><div class="post"><header class="postHeader"><a class="edit-page-link button" href="https://github.com/apache/druid/edit/master/docs/operations/rule-configuration.md" target="_blank" rel="noreferrer noopener">Edit</a><h1 id="__docusaurus" class="postHeaderTitle">Retaining or automatically dropping data</h1></header><article><div><span><!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
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+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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+<p>In Apache Druid, Coordinator processes use rules to determine what data should be loaded to or dropped from the cluster. Rules are used for data retention and query execution, and are set on the Coordinator console (<a href="http://coordinator">http://coordinator</a>_ip:port).</p>
+<p>There are three types of rules, i.e., load rules, drop rules, and broadcast rules. Load rules indicate how segments should be assigned to different historical process tiers and how many replicas of a segment should exist in each tier.
+Drop rules indicate when segments should be dropped entirely from the cluster. Finally, broadcast rules indicate how segments of different datasources should be co-located in Historical processes.</p>
+<p>The Coordinator loads a set of rules from the metadata storage. Rules may be specific to a certain datasource and/or a
+default set of rules can be configured. Rules are read in order and hence the ordering of rules is important. The
+Coordinator will cycle through all used segments and match each segment with the first rule that applies. Each segment
+may only match a single rule.</p>
+<p>Note: It is recommended that the Coordinator console is used to configure rules. However, the Coordinator process does have HTTP endpoints to programmatically configure rules.</p>
+<h2><a class="anchor" aria-hidden="true" id="load-rules"></a><a href="#load-rules" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Load rules</h2>
+<p>Load rules indicate how many replicas of a segment should exist in a server tier. <strong>Please note</strong>: If a Load rule is used to retain only data from a certain interval or period, it must be accompanied by a Drop rule. If a Drop rule is not included, data not within the specified interval or period will be retained by the default rule (loadForever).</p>
+<h3><a class="anchor" aria-hidden="true" id="forever-load-rule"></a><a href="#forever-load-rule" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Forever Load Rule</h3>
+<p>Forever load rules are of the form:</p>
+<pre><code class="hljs css language-json">{
+  <span class="hljs-attr">"type"</span> : <span class="hljs-string">"loadForever"</span>,
+  <span class="hljs-attr">"tieredReplicants"</span>: {
+    <span class="hljs-attr">"hot"</span>: <span class="hljs-number">1</span>,
+    <span class="hljs-attr">"_default_tier"</span> : <span class="hljs-number">1</span>
+  }
+}
+</code></pre>
+<ul>
+<li><code>type</code> - this should always be &quot;loadForever&quot;</li>
+<li><code>tieredReplicants</code> - A JSON Object where the keys are the tier names and values are the number of replicas for that tier.</li>
+</ul>
+<h3><a class="anchor" aria-hidden="true" id="interval-load-rule"></a><a href="#interval-load-rule" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Interval Load Rule</h3>
+<p>Interval load rules are of the form:</p>
+<pre><code class="hljs css language-json">{
+  <span class="hljs-attr">"type"</span> : <span class="hljs-string">"loadByInterval"</span>,
+  <span class="hljs-attr">"interval"</span>: <span class="hljs-string">"2012-01-01/2013-01-01"</span>,
+  <span class="hljs-attr">"tieredReplicants"</span>: {
+    <span class="hljs-attr">"hot"</span>: <span class="hljs-number">1</span>,
+    <span class="hljs-attr">"_default_tier"</span> : <span class="hljs-number">1</span>
+  }
+}
+</code></pre>
+<ul>
+<li><code>type</code> - this should always be &quot;loadByInterval&quot;</li>
+<li><code>interval</code> - A JSON Object representing ISO-8601 Intervals</li>
+<li><code>tieredReplicants</code> - A JSON Object where the keys are the tier names and values are the number of replicas for that tier.</li>
+</ul>
+<h3><a class="anchor" aria-hidden="true" id="period-load-rule"></a><a href="#period-load-rule" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Period Load Rule</h3>
+<p>Period load rules are of the form:</p>
+<pre><code class="hljs css language-json">{
+  <span class="hljs-attr">"type"</span> : <span class="hljs-string">"loadByPeriod"</span>,
+  <span class="hljs-attr">"period"</span> : <span class="hljs-string">"P1M"</span>,
+  <span class="hljs-attr">"includeFuture"</span> : <span class="hljs-literal">true</span>,
+  <span class="hljs-attr">"tieredReplicants"</span>: {
+      <span class="hljs-attr">"hot"</span>: <span class="hljs-number">1</span>,
+      <span class="hljs-attr">"_default_tier"</span> : <span class="hljs-number">1</span>
+  }
+}
+</code></pre>
+<ul>
+<li><code>type</code> - this should always be &quot;loadByPeriod&quot;</li>
+<li><code>period</code> - A JSON Object representing ISO-8601 Periods</li>
+<li><code>includeFuture</code> - A JSON Boolean indicating whether the load period should include the future. This property is optional, Default is true.</li>
+<li><code>tieredReplicants</code> - A JSON Object where the keys are the tier names and values are the number of replicas for that tier.</li>
+</ul>
+<p>The interval of a segment will be compared against the specified period. The period is from some time in the past to the future or to the current time, which depends on <code>includeFuture</code> is true or false. The rule matches if the period <em>overlaps</em> the interval.</p>
+<h2><a class="anchor" aria-hidden="true" id="drop-rules"></a><a href="#drop-rules" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Drop Rules</h2>
+<p>Drop rules indicate when segments should be dropped from the cluster.</p>
+<h3><a class="anchor" aria-hidden="true" id="forever-drop-rule"></a><a href="#forever-drop-rule" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Forever Drop Rule</h3>
+<p>Forever drop rules are of the form:</p>
+<pre><code class="hljs css language-json">{
+  <span class="hljs-attr">"type"</span> : <span class="hljs-string">"dropForever"</span>
+}
+</code></pre>
+<ul>
+<li><code>type</code> - this should always be &quot;dropForever&quot;</li>
+</ul>
+<p>All segments that match this rule are dropped from the cluster.</p>
+<h3><a class="anchor" aria-hidden="true" id="interval-drop-rule"></a><a href="#interval-drop-rule" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Interval Drop Rule</h3>
+<p>Interval drop rules are of the form:</p>
+<pre><code class="hljs css language-json">{
+  <span class="hljs-attr">"type"</span> : <span class="hljs-string">"dropByInterval"</span>,
+  <span class="hljs-attr">"interval"</span> : <span class="hljs-string">"2012-01-01/2013-01-01"</span>
+}
+</code></pre>
+<ul>
+<li><code>type</code> - this should always be &quot;dropByInterval&quot;</li>
+<li><code>interval</code> - A JSON Object representing ISO-8601 Periods</li>
+</ul>
+<p>A segment is dropped if the interval contains the interval of the segment.</p>
+<h3><a class="anchor" aria-hidden="true" id="period-drop-rule"></a><a href="#period-drop-rule" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Period Drop Rule</h3>
+<p>Period drop rules are of the form:</p>
+<pre><code class="hljs css language-json">{
+  <span class="hljs-attr">"type"</span> : <span class="hljs-string">"dropByPeriod"</span>,
+  <span class="hljs-attr">"period"</span> : <span class="hljs-string">"P1M"</span>,
+  <span class="hljs-attr">"includeFuture"</span> : <span class="hljs-literal">true</span>
+}
+</code></pre>
+<ul>
+<li><code>type</code> - this should always be &quot;dropByPeriod&quot;</li>
+<li><code>period</code> - A JSON Object representing ISO-8601 Periods</li>
+<li><code>includeFuture</code> - A JSON Boolean indicating whether the load period should include the future. This property is optional, Default is true.</li>
+</ul>
+<p>The interval of a segment will be compared against the specified period. The period is from some time in the past to the future or to the current time, which depends on <code>includeFuture</code> is true or false. The rule matches if the period <em>contains</em> the interval. This drop rule always dropping recent data.</p>
+<h3><a class="anchor" aria-hidden="true" id="period-drop-before-rule"></a><a href="#period-drop-before-rule" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Period Drop Before Rule</h3>
+<p>Period drop before rules are of the form:</p>
+<pre><code class="hljs css language-json">{
+  <span class="hljs-attr">"type"</span> : <span class="hljs-string">"dropBeforeByPeriod"</span>,
+  <span class="hljs-attr">"period"</span> : <span class="hljs-string">"P1M"</span>
+}
+</code></pre>
+<ul>
+<li><code>type</code> - this should always be &quot;dropBeforeByPeriod&quot;</li>
+<li><code>period</code> - A JSON Object representing ISO-8601 Periods</li>
+</ul>
+<p>The interval of a segment will be compared against the specified period. The period is from some time in the past to the current time. The rule matches if the interval before the period. If you just want to retain recent data, you can use this rule to drop the old data that before a specified period and add a <code>loadForever</code> rule to follow it. Notes, <code>dropBeforeByPeriod + loadForever</code> is equivalent to <code>loadByPeriod(includeFuture = true) + dropForever</code>.</p>
+<h2><a class="anchor" aria-hidden="true" id="broadcast-rules"></a><a href="#broadcast-rules" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Broadcast Rules</h2>
+<p>Broadcast rules indicate that segments of a data source should be loaded by all servers of a cluster of the following types: historicals, brokers, tasks, and indexers.</p>
+<p>Note that the broadcast segments are only directly queryable through the historicals, but they are currently loaded on other server types to support join queries.</p>
+<h3><a class="anchor" aria-hidden="true" id="forever-broadcast-rule"></a><a href="#forever-broadcast-rule" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Forever Broadcast Rule</h3>
+<p>Forever broadcast rules are of the form:</p>
+<pre><code class="hljs css language-json">{
+  <span class="hljs-attr">"type"</span> : <span class="hljs-string">"broadcastForever"</span>
+}
+</code></pre>
+<ul>
+<li><code>type</code> - this should always be &quot;broadcastForever&quot;</li>
+</ul>
+<p>This rule applies to all segments of a datasource, covering all intervals.</p>
+<h3><a class="anchor" aria-hidden="true" id="interval-broadcast-rule"></a><a href="#interval-broadcast-rule" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Interval Broadcast Rule</h3>
+<p>Interval broadcast rules are of the form:</p>
+<pre><code class="hljs css language-json">{
+  <span class="hljs-attr">"type"</span> : <span class="hljs-string">"broadcastByInterval"</span>,
+  <span class="hljs-attr">"interval"</span> : <span class="hljs-string">"2012-01-01/2013-01-01"</span>
+}
+</code></pre>
+<ul>
+<li><code>type</code> - this should always be &quot;broadcastByInterval&quot;</li>
+<li><code>interval</code> - A JSON Object representing ISO-8601 Periods. Only the segments of the interval will be broadcasted.</li>
+</ul>
+<h3><a class="anchor" aria-hidden="true" id="period-broadcast-rule"></a><a href="#period-broadcast-rule" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Period Broadcast Rule</h3>
+<p>Period broadcast rules are of the form:</p>
+<pre><code class="hljs css language-json">{
+  <span class="hljs-attr">"type"</span> : <span class="hljs-string">"broadcastByPeriod"</span>,
+  <span class="hljs-attr">"period"</span> : <span class="hljs-string">"P1M"</span>,
+  <span class="hljs-attr">"includeFuture"</span> : <span class="hljs-literal">true</span>
+}
+</code></pre>
+<ul>
+<li><code>type</code> - this should always be &quot;broadcastByPeriod&quot;</li>
+<li><code>period</code> - A JSON Object representing ISO-8601 Periods</li>
+<li><code>includeFuture</code> - A JSON Boolean indicating whether the load period should include the future. This property is optional, Default is true.</li>
+</ul>
+<p>The interval of a segment will be compared against the specified period. The period is from some time in the past to the future or to the current time, which depends on <code>includeFuture</code> is true or false. The rule matches if the period <em>overlaps</em> the interval.</p>
+<h2><a class="anchor" aria-hidden="true" id="permanently-deleting-data"></a><a href="#permanently-deleting-data" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Permanently deleting data</h2>
+<p>Druid can fully drop data from the cluster, wipe the metadata store entry, and remove the data from deep storage for any
+segments that are marked as unused (segments dropped from the cluster via rules are always marked as unused). You can
+submit a <a href="/docs/0.20.0/ingestion/tasks.html">kill task</a> to the <a href="/docs/0.20.0/design/overlord.html">Overlord</a> to do this.</p>
+<h2><a class="anchor" aria-hidden="true" id="reloading-dropped-data"></a><a href="#reloading-dropped-data" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Reloading dropped data</h2>
+<p>Data that has been dropped from a Druid cluster cannot be reloaded using only rules. To reload dropped data in Druid,
+you must first set your retention period (i.e. changing the retention period from 1 month to 2 months), and then mark as
+used all segments belonging to the datasource in the Druid Coordinator console, or through the Druid Coordinator
+endpoints.</p>
+</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/0.20.0/operations/rolling-updates.html"><span class="arrow-prev">← </span><span>Rolling updates</span></a><a class="docs-next button" href="/docs/0.20.0/operations/metrics.html"><span>Metrics</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#load-rules">Load rules</a><ul class="toc-headings"><li><a href="#forever-load-rule">Forever Load Rule</a></li><li><a href="#interval-load-rule">Interval Load Rule</a></li><li><a href="#period-load-rule">Period Load Rule</a></li></ul></li><li><a href="#drop-rules">Drop Rules</a><ul class="toc-headings"><li><a href="#forever-drop-rule">Forever Drop Rule</a></li><li><a href="#interval-drop-rule">Interval Drop Rule</a></li><li><a href="#period-drop-rule">Period Drop Rule</a></li><li><a href="#period-drop-before-rule">Period Drop Before Rule</a></li></ul></li><li><a href="#broadcast-rules">Broadcast Rules</a><ul class="toc-headings"><li><a href="#forever-broadcast-rule">Forever Broadcast Rule</a></li><li><a href="#interval-broadcast-rule">Interval Broadcast Rule</a></li><li><a href="#period-broadcast-rule">Period Broadcast Rule</a></li></ul></li><li><a href="#permanently-deleting-data">Permanently deleting data</a></li><li><a href="#reloading-dropped-data">Reloading dropped data</a></li></ul></nav></div><footer class="nav-footer druid-footer" id="footer"><div class="container"><div class="text-center"><p><a href="/technology">Technology</a> · <a href="/use-cases">Use Cases</a> · <a href="/druid-powered">Powered by Druid</a> · <a href="/docs/0.20.0/latest">Docs</a> · <a href="/community/">Community</a> · <a href="/downloads.html">Download</a> · <a href="/faq">FAQ</a></p></div><div class="text-center"><a title="Join the user group" href="https://groups.google.com/forum/#!forum/druid-user" target="_blank"><span class="fa fa-comments"></span></a> · <a title="Follow Druid" href="https://twitter.com/druidio" target="_blank"><span class="fab fa-twitter"></span></a> · <a title="Download via Apache" href="https://www.apache.org/dyn/closer.cgi?path=/incubator/druid/{{ site.druid_versions[0].versions[0].version }}/apache-druid-{{ site.druid_versions[0].versions[0].version }}-bin.tar.gz" target="_blank"><span class="fas fa-feather"></span></a> · <a title="GitHub" href="https://github.com/apache/druid" target="_blank"><span class="fab fa-github"></span></a></div><div class="text-center license">Copyright © 2019 <a href="https://www.apache.org/" target="_blank">Apache Software Foundation</a>.<br/>Except where otherwise noted, licensed under <a rel="license" href="http://creativecommons.org/licenses/by-sa/4.0/">CC BY-SA 4.0</a>.<br/>Apache Druid, Druid, and the Druid logo are either registered trademarks or trademarks of The Apache Software Foundation in the United States and other countries.</div></div></footer></div><script type="text/javascript" src="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.js"></script><script>
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@@ -0,0 +1,169 @@
+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Segment Size Optimization · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/0.20.0/operations/segment-optimization.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.20.0" /><meta property="og:title" content="Segment Size Optimization · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
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+<p>In Apache Druid, it's important to optimize the segment size because</p>
+<ol>
+<li>Druid stores data in segments. If you're using the <a href="/docs/0.20.0/ingestion/index.html#rollup">best-effort roll-up</a> mode,
+increasing the segment size might introduce further aggregation which reduces the dataSource size.</li>
+<li>When a query is submitted, that query is distributed to all Historicals and realtime tasks
+which hold the input segments of the query. Each process and task picks a thread from its own processing thread pool
+to process a single segment. If segment sizes are too large, data might not be well distributed between data
+servers, decreasing the degree of parallelism possible during query processing.
+At the other extreme where segment sizes are too small, the scheduling
+overhead of processing a larger number of segments per query can reduce
+performance, as the threads that process each segment compete for the fixed
+slots of the processing pool.</li>
+</ol>
+<p>It would be best if you can optimize the segment size at ingestion time, but sometimes it's not easy
+especially when it comes to stream ingestion because the amount of data ingested might vary over time. In this case,
+you can create segments with a sub-optimized size first and optimize them later.</p>
+<p>You may need to consider the followings to optimize your segments.</p>
+<ul>
+<li>Number of rows per segment: it's generally recommended for each segment to have around 5 million rows.
+This setting is usually <em>more</em> important than the below &quot;segment byte size&quot;.
+This is because Druid uses a single thread to process each segment,
+and thus this setting can directly control how many rows each thread processes,
+which in turn means how well the query execution is parallelized.</li>
+<li>Segment byte size: it's recommended to set 300 ~ 700MB. If this value
+doesn't match with the &quot;number of rows per segment&quot;, please consider optimizing
+number of rows per segment rather than this value.</li>
+</ul>
+<blockquote>
+<p>The above recommendation works in general, but the optimal setting can
+vary based on your workload. For example, if most of your queries
+are heavy and take a long time to process each row, you may want to make
+segments smaller so that the query processing can be more parallelized.
+If you still see some performance issue after optimizing segment size,
+you may need to find the optimal settings for your workload.</p>
+</blockquote>
+<p>There might be several ways to check if the compaction is necessary. One way
+is using the <a href="../querying/sql.html#system-schema">System Schema</a>. The
+system schema provides several tables about the current system status including the <code>segments</code> table.
+By running the below query, you can get the average number of rows and average size for published segments.</p>
+<pre><code class="hljs css language-sql"><span class="hljs-keyword">SELECT</span>
+  <span class="hljs-string">"start"</span>,
+  <span class="hljs-string">"end"</span>,
+  <span class="hljs-keyword">version</span>,
+  <span class="hljs-keyword">COUNT</span>(*) <span class="hljs-keyword">AS</span> num_segments,
+  <span class="hljs-keyword">AVG</span>(<span class="hljs-string">"num_rows"</span>) <span class="hljs-keyword">AS</span> avg_num_rows,
+  <span class="hljs-keyword">SUM</span>(<span class="hljs-string">"num_rows"</span>) <span class="hljs-keyword">AS</span> total_num_rows,
+  <span class="hljs-keyword">AVG</span>(<span class="hljs-string">"size"</span>) <span class="hljs-keyword">AS</span> avg_size,
+  <span class="hljs-keyword">SUM</span>(<span class="hljs-string">"size"</span>) <span class="hljs-keyword">AS</span> total_size
+<span class="hljs-keyword">FROM</span>
+  sys.segments A
+<span class="hljs-keyword">WHERE</span>
+  datasource = <span class="hljs-string">'your_dataSource'</span> <span class="hljs-keyword">AND</span>
+  is_published = <span class="hljs-number">1</span>
+<span class="hljs-keyword">GROUP</span> <span class="hljs-keyword">BY</span> <span class="hljs-number">1</span>, <span class="hljs-number">2</span>, <span class="hljs-number">3</span>
+<span class="hljs-keyword">ORDER</span> <span class="hljs-keyword">BY</span> <span class="hljs-number">1</span>, <span class="hljs-number">2</span>, <span class="hljs-number">3</span> <span class="hljs-keyword">DESC</span>;
+</code></pre>
+<p>Please note that the query result might include overshadowed segments.
+In this case, you may want to see only rows of the max version per interval (pair of <code>start</code> and <code>end</code>).</p>
+<p>Once you find your segments need compaction, you can consider the below two options:</p>
+<ul>
+<li>Turning on the <a href="../design/coordinator.html#compacting-segments">automatic compaction of Coordinators</a>.
+The Coordinator periodically submits <a href="/docs/0.20.0/ingestion/tasks.html#compact">compaction tasks</a> to re-index small segments.
+To enable the automatic compaction, you need to configure it for each dataSource via Coordinator's dynamic configuration.
+See <a href="../operations/api-reference.html#compaction-configuration">Compaction Configuration API</a>
+and <a href="../configuration/index.html#compaction-dynamic-configuration">Compaction Configuration</a> for details.</li>
+<li>Running periodic Hadoop batch ingestion jobs and using a <code>dataSource</code>
+inputSpec to read from the segments generated by the Kafka indexing tasks. This might be helpful if you want to compact a lot of segments in parallel.
+Details on how to do this can be found on the <a href="/docs/0.20.0/ingestion/data-management.html#update">Updating existing data</a> section
+of the data management page.</li>
+</ul>
+</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/0.20.0/operations/metadata-migration.html"><span class="arrow-prev">← </span><span>Metadata Migration</span></a><a class="docs-next button" href="/docs/0.20.0/operations/use_sbt_to_build_fat_jar.html"><span>Content for build.sbt</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"></nav></div><footer class="nav-footer druid-footer" id="footer"><div class="container"><div class="text-center"><p><a href="/technology">Technology</a> · <a href="/use-cases">Use Cases</a> · <a href="/druid-powered">Powered by Druid</a> · <a href="/docs/0.20.0/latest">Docs</a> · <a href="/community/">Community</a> · <a href="/downloads.html">Download</a> · <a href="/faq">FAQ</a></p></div><div class="text-center"><a title="Join the user group" href="https://groups.google.com/forum/#!forum/druid-user" target="_blank"><span class="fa fa-comments"></span></a> · <a title="Follow Druid" href="https://twitter.com/druidio" target="_blank"><span class="fab fa-twitter"></span></a> · <a title="Download via Apache" href="https://www.apache.org/dyn/closer.cgi?path=/incubator/druid/{{ site.druid_versions[0].versions[0].version }}/apache-druid-{{ site.druid_versions[0].versions[0].version }}-bin.tar.gz" target="_blank"><span class="fas fa-feather"></span></a> · <a title="GitHub" href="https://github.com/apache/druid" target="_blank"><span class="fab fa-github"></span></a></div><div class="text-center license">Copyright © 2019 <a href="https://www.apache.org/" target="_blank">Apache Software Foundation</a>.<br/>Except where otherwise noted, licensed under <a rel="license" href="http://creativecommons.org/licenses/by-sa/4.0/">CC BY-SA 4.0</a>.<br/>Apache Druid, Druid, and the Druid logo are either registered trademarks or trademarks of The Apache Software Foundation in the United States and other countries.</div></div></footer></div><script type="text/javascript" src="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.js"></script><script>
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+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+  -->
+<p>Druid includes a set of reference configurations and launch scripts for single-machine deployments:</p>
+<ul>
+<li><code>nano-quickstart</code></li>
+<li><code>micro-quickstart</code></li>
+<li><code>small</code></li>
+<li><code>medium</code></li>
+<li><code>large</code></li>
+<li><code>xlarge</code></li>
+</ul>
+<p>The <code>micro-quickstart</code> is sized for small machines like laptops and is intended for quick evaluation use-cases.</p>
+<p>The <code>nano-quickstart</code> is an even smaller configuration, targeting a machine with 1 CPU and 4GB memory. It is meant for limited evaluations in resource constrained environments, such as small Docker containers.</p>
+<p>The other configurations are intended for general use single-machine deployments. They are sized for hardware roughly based on Amazon's i3 series of EC2 instances.</p>
+<p>The startup scripts for these example configurations run a single ZK instance along with the Druid services. You can choose to deploy ZK separately as well.</p>
+<p>The example configurations run the Druid Coordinator and Overlord together in a single process using the optional configuration <code>druid.coordinator.asOverlord.enabled=true</code>, described in the <a href="../configuration/index.html#coordinator-operation">Coordinator configuration documentation</a>.</p>
+<p>While example configurations are provided for very large single machines, at higher scales we recommend running Druid in a <a href="/docs/0.20.0/tutorials/cluster.html">clustered deployment</a>, for fault-tolerance and reduced resource contention.</p>
+<h2><a class="anchor" aria-hidden="true" id="single-server-reference-configurations"></a><a href="#single-server-reference-configurations" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Single server reference configurations</h2>
+<h3><a class="anchor" aria-hidden="true" id="nano-quickstart-1-cpu-4gb-ram"></a><a href="#nano-quickstart-1-cpu-4gb-ram" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Nano-Quickstart: 1 CPU, 4GB RAM</h3>
+<ul>
+<li>Launch command: <code>bin/start-nano-quickstart</code></li>
+<li>Configuration directory: <code>conf/druid/single-server/nano-quickstart</code></li>
+</ul>
+<h3><a class="anchor" aria-hidden="true" id="micro-quickstart-4-cpu-16gb-ram"></a><a href="#micro-quickstart-4-cpu-16gb-ram" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Micro-Quickstart: 4 CPU, 16GB RAM</h3>
+<ul>
+<li>Launch command: <code>bin/start-micro-quickstart</code></li>
+<li>Configuration directory: <code>conf/druid/single-server/micro-quickstart</code></li>
+</ul>
+<h3><a class="anchor" aria-hidden="true" id="small-8-cpu-64gb-ram-i32xlarge"></a><a href="#small-8-cpu-64gb-ram-i32xlarge" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Small: 8 CPU, 64GB RAM (~i3.2xlarge)</h3>
+<ul>
+<li>Launch command: <code>bin/start-small</code></li>
+<li>Configuration directory: <code>conf/druid/single-server/small</code></li>
+</ul>
+<h3><a class="anchor" aria-hidden="true" id="medium-16-cpu-128gb-ram-i34xlarge"></a><a href="#medium-16-cpu-128gb-ram-i34xlarge" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Medium: 16 CPU, 128GB RAM (~i3.4xlarge)</h3>
+<ul>
+<li>Launch command: <code>bin/start-medium</code></li>
+<li>Configuration directory: <code>conf/druid/single-server/medium</code></li>
+</ul>
+<h3><a class="anchor" aria-hidden="true" id="large-32-cpu-256gb-ram-i38xlarge"></a><a href="#large-32-cpu-256gb-ram-i38xlarge" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Large: 32 CPU, 256GB RAM (~i3.8xlarge)</h3>
+<ul>
+<li>Launch command: <code>bin/start-large</code></li>
+<li>Configuration directory: <code>conf/druid/single-server/large</code></li>
+</ul>
+<h3><a class="anchor" aria-hidden="true" id="x-large-64-cpu-512gb-ram-i316xlarge"></a><a href="#x-large-64-cpu-512gb-ram-i316xlarge" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>X-Large: 64 CPU, 512GB RAM (~i3.16xlarge)</h3>
+<ul>
+<li>Launch command: <code>bin/start-xlarge</code></li>
+<li>Configuration directory: <code>conf/druid/single-server/xlarge</code></li>
+</ul>
+</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/0.20.0/tutorials/docker.html"><span class="arrow-prev">← </span><span>Docker</span></a><a class="docs-next button" href="/docs/0.20.0/tutorials/cluster.html"><span>Clustered deployment</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#single-server-reference-configurations">Single server reference configurations</a><ul class="toc-headings"><li><a href="#nano-quickstart-1-cpu-4gb-ram">Nano-Quickstart: 1 CPU, 4GB RAM</a></li><li><a href="#micro-quickstart-4-cpu-16gb-ram">Micro-Quickstart: 4 CPU, 16GB RAM</a></li><li><a href="#small-8-cpu-64gb-ram-i32xlarge">Small: 8 CPU, 64GB RAM (~i3.2xlarge)</a></li><li><a href="#medium-16-cpu-128gb-ram-i34xlarge">Medium: 16 CPU, 128GB RAM (~i3.4xlarge)</a></li><li><a href="#large-32-cpu-256gb-ram-i38xlarge">Large: 32 CPU, 256GB RAM (~i3.8xlarge)</a></li><li><a href="#x-large-64-cpu-512gb-ram-i316xlarge">X-Large: 64 CPU, 512GB RAM (~i3.16xlarge)</a></li></ul></li></ul></nav></div><footer class="nav-footer druid-footer" id="footer"><div class="container"><div class="text-center"><p><a href="/technology">Technology</a> · <a href="/use-cases">Use Cases</a> · <a href="/druid-powered">Powered by Druid</a> · <a href="/docs/0.20.0/latest">Docs</a> · <a href="/community/">Community</a> · <a href="/downloads.html">Download</a> · <a href="/faq">FAQ</a></p></div><div class="text-center"><a title="Join the user group" href="https://groups.google.com/forum/#!forum/druid-user" target="_blank"><span class="fa fa-comments"></span></a> · <a title="Follow Druid" href="https://twitter.com/druidio" target="_blank"><span class="fab fa-twitter"></span></a> · <a title="Download via Apache" href="https://www.apache.org/dyn/closer.cgi?path=/incubator/druid/{{ site.druid_versions[0].versions[0].version }}/apache-druid-{{ site.druid_versions[0].versions[0].version }}-bin.tar.gz" target="_blank"><span class="fas fa-feather"></span></a> · <a title="GitHub" href="https://github.com/apache/druid" target="_blank"><span class="fab fa-github"></span></a></div><div class="text-center license">Copyright © 2019 <a href="https://www.apache.org/" target="_blank">Apache Software Foundation</a>.<br/>Except where otherwise noted, licensed under <a rel="license" href="http://creativecommons.org/licenses/by-sa/4.0/">CC BY-SA 4.0</a>.<br/>Apache Druid, Druid, and the Druid logo are either registered trademarks or trademarks of The Apache Software Foundation in the United States and other countries.</div></div></footer></div><script type="text/javascript" src="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.js"></script><script>
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@@ -0,0 +1,184 @@
+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>TLS support · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/0.20.0/operations/tls-support.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.20.0" /><meta property="og:title" content="TLS support · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
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class="icon-toc"></i></div></div><div class="navGroups"><div class="navGroup"><h3 class="navGroupCategoryTitle collapsible">Getting started<span class="arrow"><svg width="24" height="24" viewBox="0 0 24 24"><path fill="#565656" d="M7.41 15.41L12 10.83l4.59 4.58L18 14l-6-6-6 6z"></path><path d="M0 0h24v24H0z" fill="none"></path></svg></span></h3><ul class="hide"><li class="navListItem"><a class="navItem" href="/docs/0.20.0/design/index.html">Introduction to Apache Druid</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/tutorials/index.html">Quickstart</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/tutorials/docker.html">Docker</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/operations/single-server.html">Single server deployment</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/tutorials/cluster.html">Clustered deployment</a></li></ul></div><div class="navGroup"><h3 class="navGroupCategoryTitle collapsible">Tutorials<span class="arrow"><svg width="24" height="24" viewBox="0 0 24 24"><path fill="#565656" d="M7.41 15.41L12 10.83l4.59 4.58L18 14l-6-6-6 6z"></path><path d="M0 0h24v24H0z" fill="none"></path></svg></span></h3><ul class="hide"><li class="navListItem"><a class="navItem" href="/docs/0.20.0/tutorials/tutorial-batch.html">Loading files natively</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/tutorials/tutorial-kafka.html">Load from Apache Kafka</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/tutorials/tutorial-batch-hadoop.html">Load from Apache Hadoop</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/tutorials/tutorial-query.html">Querying data</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/tutorials/tutorial-rollup.html">Roll-up</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/tutorials/tutorial-retention.html">Configuring data retention</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/tutorials/tutorial-update-data.html">Updating existing data</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/tutorials/tutorial-compaction.html">Compacting segments</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/tutorials/tutorial-delete-data.html">Deleting data</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/tutorials/tutorial-ingestion-spec.html">Writing an ingestion spec</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/tutorials/tutorial-transform-spec.html">Transforming input data</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/tutorials/tutorial-kerberos-hadoop.html">Kerberized HDFS deep storage</a></li></ul></div><div class="navGroup"><h3 class="navGroupCategoryTitle collapsible">Design<span class="arrow"><svg width="24" height="24" viewBox="0 0 24 24"><path fill="#565656" d="M7.41 15.41L12 10.83l4.59 4.58L18 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+  ~ under the License.
+  -->
+<h2><a class="anchor" aria-hidden="true" id="general-configuration"></a><a href="#general-configuration" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>General configuration</h2>
+<table>
+<thead>
+<tr><th>Property</th><th>Description</th><th>Default</th></tr>
+</thead>
+<tbody>
+<tr><td><code>druid.enablePlaintextPort</code></td><td>Enable/Disable HTTP connector.</td><td><code>true</code></td></tr>
+<tr><td><code>druid.enableTlsPort</code></td><td>Enable/Disable HTTPS connector.</td><td><code>false</code></td></tr>
+</tbody>
+</table>
+<p>Although not recommended but both HTTP and HTTPS connectors can be enabled at a time and respective ports are configurable using <code>druid.plaintextPort</code>
+and <code>druid.tlsPort</code> properties on each process. Please see <code>Configuration</code> section of individual processes to check the valid and default values for these ports.</p>
+<h2><a class="anchor" aria-hidden="true" id="jetty-server-configuration"></a><a href="#jetty-server-configuration" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Jetty server configuration</h2>
+<p>Apache Druid uses Jetty as an embedded web server. To get familiar with TLS/SSL in general and related concepts like Certificates etc.
+reading this <a href="http://www.eclipse.org/jetty/documentation/9.4.x/configuring-ssl.html">Jetty documentation</a> might be helpful.
+To get more in depth knowledge of TLS/SSL support in Java in general, please refer to this <a href="http://docs.oracle.com/javase/8/docs/technotes/guides/security/jsse/JSSERefGuide.html">guide</a>.
+The documentation <a href="http://www.eclipse.org/jetty/documentation/9.4.x/configuring-ssl.html#configuring-sslcontextfactory">here</a>
+can help in understanding TLS/SSL configurations listed below. This <a href="http://docs.oracle.com/javase/8/docs/technotes/guides/security/StandardNames.html">document</a> lists all the possible
+values for the below mentioned configs among others provided by Java implementation.</p>
+<table>
+<thead>
+<tr><th>Property</th><th>Description</th><th>Default</th><th>Required</th></tr>
+</thead>
+<tbody>
+<tr><td><code>druid.server.https.keyStorePath</code></td><td>The file path or URL of the TLS/SSL Key store.</td><td>none</td><td>yes</td></tr>
+<tr><td><code>druid.server.https.keyStoreType</code></td><td>The type of the key store.</td><td>none</td><td>yes</td></tr>
+<tr><td><code>druid.server.https.certAlias</code></td><td>Alias of TLS/SSL certificate for the connector.</td><td>none</td><td>yes</td></tr>
+<tr><td><code>druid.server.https.keyStorePassword</code></td><td>The <a href="/docs/0.20.0/operations/password-provider.html">Password Provider</a> or String password for the Key Store.</td><td>none</td><td>yes</td></tr>
+</tbody>
+</table>
+<p>The following table contains configuration options related to client certificate authentication.</p>
+<table>
+<thead>
+<tr><th>Property</th><th>Description</th><th>Default</th><th>Required</th></tr>
+</thead>
+<tbody>
+<tr><td><code>druid.server.https.requireClientCertificate</code></td><td>If set to true, clients must identify themselves by providing a TLS certificate, without which connections will fail.</td><td>false</td><td>no</td></tr>
+<tr><td><code>druid.server.https.requestClientCertificate</code></td><td>If set to true, clients may optionally identify themselves by providing a TLS certificate. Connections will not fail if TLS certificate is not provided. This property is ignored if <code>requireClientCertificate</code> is set to true. If <code>requireClientCertificate</code> and <code>requestClientCertificate</code> are false, the rest of the options in this table are ignored.</td><td>false</td><td>no</td></tr>
+<tr><td><code>druid.server.https.trustStoreType</code></td><td>The type of the trust store containing certificates used to validate client certificates. Not needed if <code>requireClientCertificate</code> and <code>requestClientCertificate</code> are false.</td><td><code>java.security.KeyStore.getDefaultType()</code></td><td>no</td></tr>
+<tr><td><code>druid.server.https.trustStorePath</code></td><td>The file path or URL of the trust store containing certificates used to validate client certificates. Not needed if <code>requireClientCertificate</code> and <code>requestClientCertificate</code> are false.</td><td>none</td><td>yes, only if <code>requireClientCertificate</code> is true</td></tr>
+<tr><td><code>druid.server.https.trustStoreAlgorithm</code></td><td>Algorithm to be used by TrustManager to validate client certificate chains. Not needed if <code>requireClientCertificate</code> and <code>requestClientCertificate</code> are false.</td><td><code>javax.net.ssl.TrustManagerFactory.getDefaultAlgorithm()</code></td><td>no</td></tr>
+<tr><td><code>druid.server.https.trustStorePassword</code></td><td>The <a href="/docs/0.20.0/operations/password-provider.html">password provider</a> or String password for the Trust Store.  Not needed if <code>requireClientCertificate</code> and <code>requestClientCertificate</code> are false.</td><td>none</td><td>no</td></tr>
+<tr><td><code>druid.server.https.validateHostnames</code></td><td>If set to true, check that the client's hostname matches the CN/subjectAltNames in the client certificate.  Not used if <code>requireClientCertificate</code> and <code>requestClientCertificate</code> are false.</td><td>true</td><td>no</td></tr>
+<tr><td><code>druid.server.https.crlPath</code></td><td>Specifies a path to a file containing static <a href="https://en.wikipedia.org/wiki/Certificate_revocation_list">Certificate Revocation Lists</a>, used to check if a client certificate has been revoked. Not used if <code>requireClientCertificate</code> and <code>requestClientCertificate</code> are false.</td><td>null</td><td>no</td></tr>
+</tbody>
+</table>
+<p>The following table contains non-mandatory advanced configuration options, use caution.</p>
+<table>
+<thead>
+<tr><th>Property</th><th>Description</th><th>Default</th><th>Required</th></tr>
+</thead>
+<tbody>
+<tr><td><code>druid.server.https.keyManagerFactoryAlgorithm</code></td><td>Algorithm to use for creating KeyManager, more details <a href="https://docs.oracle.com/javase/7/docs/technotes/guides/security/jsse/JSSERefGuide.html#KeyManager">here</a>.</td><td><code>javax.net.ssl.KeyManagerFactory.getDefaultAlgorithm()</code></td><td>no</td></tr>
+<tr><td><code>druid.server.https.keyManagerPassword</code></td><td>The <a href="/docs/0.20.0/operations/password-provider.html">Password Provider</a> or String password for the Key Manager.</td><td>none</td><td>no</td></tr>
+<tr><td><code>druid.server.https.includeCipherSuites</code></td><td>List of cipher suite names to include. You can either use the exact cipher suite name or a regular expression.</td><td>Jetty's default include cipher list</td><td>no</td></tr>
+<tr><td><code>druid.server.https.excludeCipherSuites</code></td><td>List of cipher suite names to exclude. You can either use the exact cipher suite name or a regular expression.</td><td>Jetty's default exclude cipher list</td><td>no</td></tr>
+<tr><td><code>druid.server.https.includeProtocols</code></td><td>List of exact protocols names to include.</td><td>Jetty's default include protocol list</td><td>no</td></tr>
+<tr><td><code>druid.server.https.excludeProtocols</code></td><td>List of exact protocols names to exclude.</td><td>Jetty's default exclude protocol list</td><td>no</td></tr>
+</tbody>
+</table>
+<h2><a class="anchor" aria-hidden="true" id="internal-communication-over-tls"></a><a href="#internal-communication-over-tls" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Internal communication over TLS</h2>
+<p>Whenever possible Druid processes will use HTTPS to talk to each other. To enable this communication Druid's HttpClient needs to
+be configured with a proper <a href="http://docs.oracle.com/javase/8/docs/api/javax/net/ssl/SSLContext.html">SSLContext</a> that is able
+to validate the Server Certificates, otherwise communication will fail.</p>
+<p>Since, there are various ways to configure SSLContext, by default, Druid looks for an instance of SSLContext Guice binding
+while creating the HttpClient. This binding can be achieved writing a <a href="/docs/0.20.0/development/extensions.html">Druid extension</a>
+which can provide an instance of SSLContext. Druid comes with a simple extension present <a href="/docs/0.20.0/development/extensions-core/simple-client-sslcontext.html">here</a>
+which should be useful enough for most simple cases, see <a href="/docs/0.20.0/development/extensions.html#loading-extensions">this</a> for how to include extensions.
+If this extension does not satisfy the requirements then please follow the extension <a href="https://github.com/apache/druid/tree/master/extensions-core/simple-client-sslcontext">implementation</a>
+to create your own extension.</p>
+<p>When Druid Coordinator/Overlord have both HTTP and HTTPS enabled and Client sends request to non-leader process, then Client is always redirected to the HTTPS endpoint on leader process.
+So, Clients should be first upgraded to be able to handle redirect to HTTPS. Then Druid Overlord/Coordinator should be upgraded and configured to run both HTTP and HTTPS ports. Then Client configuration should be changed to refer to Druid Coordinator/Overlord via the HTTPS endpoint and then HTTP port on Druid Coordinator/Overlord should be disabled.</p>
+<h2><a class="anchor" aria-hidden="true" id="custom-certificate-checks"></a><a href="#custom-certificate-checks" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Custom certificate checks</h2>
+<p>Druid supports custom certificate check extensions. Please refer to the <code>org.apache.druid.server.security.TLSCertificateChecker</code> interface for details on the methods to be implemented.</p>
+<p>To use a custom TLS certificate checker, specify the following property:</p>
+<table>
+<thead>
+<tr><th>Property</th><th>Description</th><th>Default</th><th>Required</th></tr>
+</thead>
+<tbody>
+<tr><td><code>druid.tls.certificateChecker</code></td><td>Type name of custom TLS certificate checker, provided by extensions. Please refer to extension documentation for the type name that should be specified.</td><td>&quot;default&quot;</td><td>no</td></tr>
+</tbody>
+</table>
+<p>The default checker delegates to the standard trust manager and performs no additional actions or checks.</p>
+<p>If using a non-default certificate checker, please refer to the extension documentation for additional configuration properties needed.</p>
+</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/0.20.0/operations/http-compression.html"><span class="arrow-prev">← </span><span>HTTP compression</span></a><a class="docs-next button" href="/docs/0.20.0/operations/password-provider.html"><span>Password providers</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#general-configuration">General configuration</a></li><li><a href="#jetty-server-configuration">Jetty server configuration</a></li><li><a href="#internal-communication-over-tls">Internal communication over TLS</a></li><li><a href="#custom-certificate-checks">Custom certificate checks</a></li></ul></nav></div><footer class="nav-footer druid-footer" id="footer"><div class="container"><div class="text-center"><p><a href="/technology">Technology</a> · <a href="/use-cases">Use Cases</a> · <a href="/druid-powered">Powered by Druid</a> · <a href="/docs/0.20.0/latest">Docs</a> · <a href="/community/">Community</a> · <a href="/downloads.html">Download</a> · <a href="/faq">FAQ</a></p></div><div class="text-center"><a title="Join the user group" href="https://groups.google.com/forum/#!forum/druid-user" target="_blank"><span class="fa fa-comments"></span></a> · <a title="Follow Druid" href="https://twitter.com/druidio" target="_blank"><span class="fab fa-twitter"></span></a> · <a title="Download via Apache" href="https://www.apache.org/dyn/closer.cgi?path=/incubator/druid/{{ site.druid_versions[0].versions[0].version }}/apache-druid-{{ site.druid_versions[0].versions[0].version }}-bin.tar.gz" target="_blank"><span class="fas fa-feather"></span></a> · <a title="GitHub" href="https://github.com/apache/druid" target="_blank"><span class="fab fa-github"></span></a></div><div class="text-center license">Copyright © 2019 <a href="https://www.apache.org/" target="_blank">Apache Software Foundation</a>.<br/>Except where otherwise noted, licensed under <a rel="license" href="http://creativecommons.org/licenses/by-sa/4.0/">CC BY-SA 4.0</a>.<br/>Apache Druid, Druid, and the Druid logo are either registered trademarks or trademarks of The Apache Software Foundation in the United States and other countries.</div></div></footer></div><script type="text/javascript" src="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.js"></script><script>
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+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Content for build.sbt · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/0.20.0/operations/use_sbt_to_build_fat_jar.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.20.0" /><meta property="og:title" content="Content for build.sbt · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
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class="icon-toc"></i></div></div><div class="navGroups"><div class="navGroup"><h3 class="navGroupCategoryTitle collapsible">Getting started<span class="arrow"><svg width="24" height="24" viewBox="0 0 24 24"><path fill="#565656" d="M7.41 15.41L12 10.83l4.59 4.58L18 14l-6-6-6 6z"></path><path d="M0 0h24v24H0z" fill="none"></path></svg></span></h3><ul class="hide"><li class="navListItem"><a class="navItem" href="/docs/0.20.0/design/index.html">Introduction to Apache Druid</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/tutorials/index.html">Quickstart</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/tutorials/docker.html">Docker</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/operations/single-server.html">Single server deployment</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/tutorials/cluster.html">Clustered deployment</a></li></ul></div><div class="navGroup"><h3 class="navGroupCategoryTitle 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+        </script></nav></div><div class="container mainContainer docsContainer"><div class="wrapper"><div class="post"><header class="postHeader"><a class="edit-page-link button" href="https://github.com/apache/druid/edit/master/docs/operations/use_sbt_to_build_fat_jar.md" target="_blank" rel="noreferrer noopener">Edit</a><h1 id="__docusaurus" class="postHeaderTitle">Content for build.sbt</h1></header><article><div><span><!--
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+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+  -->
+<pre><code class="hljs css language-scala">libraryDependencies ++= <span class="hljs-type">Seq</span>(
+  <span class="hljs-string">"com.amazonaws"</span> % <span class="hljs-string">"aws-java-sdk"</span> % <span class="hljs-string">"1.9.23"</span> exclude(<span class="hljs-string">"common-logging"</span>, <span class="hljs-string">"common-logging"</span>),
+  <span class="hljs-string">"org.joda"</span> % <span class="hljs-string">"joda-convert"</span> % <span class="hljs-string">"1.7"</span>,
+  <span class="hljs-string">"joda-time"</span> % <span class="hljs-string">"joda-time"</span> % <span class="hljs-string">"2.7"</span>,
+  <span class="hljs-string">"org.apache.druid"</span> % <span class="hljs-string">"druid"</span> % <span class="hljs-string">"0.8.1"</span> excludeAll (
+    <span class="hljs-type">ExclusionRule</span>(<span class="hljs-string">"org.ow2.asm"</span>),
+    <span class="hljs-type">ExclusionRule</span>(<span class="hljs-string">"com.fasterxml.jackson.core"</span>),
+    <span class="hljs-type">ExclusionRule</span>(<span class="hljs-string">"com.fasterxml.jackson.datatype"</span>),
+    <span class="hljs-type">ExclusionRule</span>(<span class="hljs-string">"com.fasterxml.jackson.dataformat"</span>),
+    <span class="hljs-type">ExclusionRule</span>(<span class="hljs-string">"com.fasterxml.jackson.jaxrs"</span>),
+    <span class="hljs-type">ExclusionRule</span>(<span class="hljs-string">"com.fasterxml.jackson.module"</span>)
+  ),
+  <span class="hljs-string">"org.apache.druid"</span> % <span class="hljs-string">"druid-services"</span> % <span class="hljs-string">"0.8.1"</span> excludeAll (
+    <span class="hljs-type">ExclusionRule</span>(<span class="hljs-string">"org.ow2.asm"</span>),
+    <span class="hljs-type">ExclusionRule</span>(<span class="hljs-string">"com.fasterxml.jackson.core"</span>),
+    <span class="hljs-type">ExclusionRule</span>(<span class="hljs-string">"com.fasterxml.jackson.datatype"</span>),
+    <span class="hljs-type">ExclusionRule</span>(<span class="hljs-string">"com.fasterxml.jackson.dataformat"</span>),
+    <span class="hljs-type">ExclusionRule</span>(<span class="hljs-string">"com.fasterxml.jackson.jaxrs"</span>),
+    <span class="hljs-type">ExclusionRule</span>(<span class="hljs-string">"com.fasterxml.jackson.module"</span>)
+  ),
+  <span class="hljs-string">"org.apache.druid"</span> % <span class="hljs-string">"druid-indexing-service"</span> % <span class="hljs-string">"0.8.1"</span> excludeAll (
+    <span class="hljs-type">ExclusionRule</span>(<span class="hljs-string">"org.ow2.asm"</span>),
+    <span class="hljs-type">ExclusionRule</span>(<span class="hljs-string">"com.fasterxml.jackson.core"</span>),
+    <span class="hljs-type">ExclusionRule</span>(<span class="hljs-string">"com.fasterxml.jackson.datatype"</span>),
+    <span class="hljs-type">ExclusionRule</span>(<span class="hljs-string">"com.fasterxml.jackson.dataformat"</span>),
+    <span class="hljs-type">ExclusionRule</span>(<span class="hljs-string">"com.fasterxml.jackson.jaxrs"</span>),
+    <span class="hljs-type">ExclusionRule</span>(<span class="hljs-string">"com.fasterxml.jackson.module"</span>)
+  ),
+  <span class="hljs-string">"org.apache.druid"</span> % <span class="hljs-string">"druid-indexing-hadoop"</span> % <span class="hljs-string">"0.8.1"</span> excludeAll (
+    <span class="hljs-type">ExclusionRule</span>(<span class="hljs-string">"org.ow2.asm"</span>),
+    <span class="hljs-type">ExclusionRule</span>(<span class="hljs-string">"com.fasterxml.jackson.core"</span>),
+    <span class="hljs-type">ExclusionRule</span>(<span class="hljs-string">"com.fasterxml.jackson.datatype"</span>),
+    <span class="hljs-type">ExclusionRule</span>(<span class="hljs-string">"com.fasterxml.jackson.dataformat"</span>),
+    <span class="hljs-type">ExclusionRule</span>(<span class="hljs-string">"com.fasterxml.jackson.jaxrs"</span>),
+    <span class="hljs-type">ExclusionRule</span>(<span class="hljs-string">"com.fasterxml.jackson.module"</span>)
+  ),
+  <span class="hljs-string">"org.apache.druid.extensions"</span> % <span class="hljs-string">"mysql-metadata-storage"</span> % <span class="hljs-string">"0.8.1"</span> excludeAll (
+    <span class="hljs-type">ExclusionRule</span>(<span class="hljs-string">"org.ow2.asm"</span>),
+    <span class="hljs-type">ExclusionRule</span>(<span class="hljs-string">"com.fasterxml.jackson.core"</span>),
+    <span class="hljs-type">ExclusionRule</span>(<span class="hljs-string">"com.fasterxml.jackson.datatype"</span>),
+    <span class="hljs-type">ExclusionRule</span>(<span class="hljs-string">"com.fasterxml.jackson.dataformat"</span>),
+    <span class="hljs-type">ExclusionRule</span>(<span class="hljs-string">"com.fasterxml.jackson.jaxrs"</span>),
+    <span class="hljs-type">ExclusionRule</span>(<span class="hljs-string">"com.fasterxml.jackson.module"</span>)
+  ),
+  <span class="hljs-string">"org.apache.druid.extensions"</span> % <span class="hljs-string">"druid-s3-extensions"</span> % <span class="hljs-string">"0.8.1"</span> excludeAll (
+    <span class="hljs-type">ExclusionRule</span>(<span class="hljs-string">"org.ow2.asm"</span>),
+    <span class="hljs-type">ExclusionRule</span>(<span class="hljs-string">"com.fasterxml.jackson.core"</span>),
+    <span class="hljs-type">ExclusionRule</span>(<span class="hljs-string">"com.fasterxml.jackson.datatype"</span>),
+    <span class="hljs-type">ExclusionRule</span>(<span class="hljs-string">"com.fasterxml.jackson.dataformat"</span>),
+    <span class="hljs-type">ExclusionRule</span>(<span class="hljs-string">"com.fasterxml.jackson.jaxrs"</span>),
+    <span class="hljs-type">ExclusionRule</span>(<span class="hljs-string">"com.fasterxml.jackson.module"</span>)
+  ),
+  <span class="hljs-string">"org.apache.druid.extensions"</span> % <span class="hljs-string">"druid-histogram"</span> % <span class="hljs-string">"0.8.1"</span> excludeAll (
+    <span class="hljs-type">ExclusionRule</span>(<span class="hljs-string">"org.ow2.asm"</span>),
+    <span class="hljs-type">ExclusionRule</span>(<span class="hljs-string">"com.fasterxml.jackson.core"</span>),
+    <span class="hljs-type">ExclusionRule</span>(<span class="hljs-string">"com.fasterxml.jackson.datatype"</span>),
+    <span class="hljs-type">ExclusionRule</span>(<span class="hljs-string">"com.fasterxml.jackson.dataformat"</span>),
+    <span class="hljs-type">ExclusionRule</span>(<span class="hljs-string">"com.fasterxml.jackson.jaxrs"</span>),
+    <span class="hljs-type">ExclusionRule</span>(<span class="hljs-string">"com.fasterxml.jackson.module"</span>)
+  ),
+  <span class="hljs-string">"org.apache.druid.extensions"</span> % <span class="hljs-string">"druid-hdfs-storage"</span> % <span class="hljs-string">"0.8.1"</span> excludeAll (
+    <span class="hljs-type">ExclusionRule</span>(<span class="hljs-string">"org.ow2.asm"</span>),
+    <span class="hljs-type">ExclusionRule</span>(<span class="hljs-string">"com.fasterxml.jackson.core"</span>),
+    <span class="hljs-type">ExclusionRule</span>(<span class="hljs-string">"com.fasterxml.jackson.datatype"</span>),
+    <span class="hljs-type">ExclusionRule</span>(<span class="hljs-string">"com.fasterxml.jackson.dataformat"</span>),
+    <span class="hljs-type">ExclusionRule</span>(<span class="hljs-string">"com.fasterxml.jackson.jaxrs"</span>),
+    <span class="hljs-type">ExclusionRule</span>(<span class="hljs-string">"com.fasterxml.jackson.module"</span>)
+  ),
+  <span class="hljs-string">"com.fasterxml.jackson.core"</span> % <span class="hljs-string">"jackson-annotations"</span> % <span class="hljs-string">"2.3.0"</span>,
+  <span class="hljs-string">"com.fasterxml.jackson.core"</span> % <span class="hljs-string">"jackson-core"</span> % <span class="hljs-string">"2.3.0"</span>,
+  <span class="hljs-string">"com.fasterxml.jackson.core"</span> % <span class="hljs-string">"jackson-databind"</span> % <span class="hljs-string">"2.3.0"</span>,
+  <span class="hljs-string">"com.fasterxml.jackson.datatype"</span> % <span class="hljs-string">"jackson-datatype-guava"</span> % <span class="hljs-string">"2.3.0"</span>,
+  <span class="hljs-string">"com.fasterxml.jackson.datatype"</span> % <span class="hljs-string">"jackson-datatype-joda"</span> % <span class="hljs-string">"2.3.0"</span>,
+  <span class="hljs-string">"com.fasterxml.jackson.jaxrs"</span> % <span class="hljs-string">"jackson-jaxrs-base"</span> % <span class="hljs-string">"2.3.0"</span>,
+  <span class="hljs-string">"com.fasterxml.jackson.jaxrs"</span> % <span class="hljs-string">"jackson-jaxrs-json-provider"</span> % <span class="hljs-string">"2.3.0"</span>,
+  <span class="hljs-string">"com.fasterxml.jackson.jaxrs"</span> % <span class="hljs-string">"jackson-jaxrs-smile-provider"</span> % <span class="hljs-string">"2.3.0"</span>,
+  <span class="hljs-string">"com.fasterxml.jackson.module"</span> % <span class="hljs-string">"jackson-module-jaxb-annotations"</span> % <span class="hljs-string">"2.3.0"</span>,
+  <span class="hljs-string">"com.sun.jersey"</span> % <span class="hljs-string">"jersey-servlet"</span> % <span class="hljs-string">"1.17.1"</span>,
+  <span class="hljs-string">"mysql"</span> % <span class="hljs-string">"mysql-connector-java"</span> % <span class="hljs-string">"5.1.34"</span>,
+  <span class="hljs-string">"org.scalatest"</span> %% <span class="hljs-string">"scalatest"</span> % <span class="hljs-string">"2.2.3"</span> % <span class="hljs-string">"test"</span>,
+  <span class="hljs-string">"org.mockito"</span> % <span class="hljs-string">"mockito-core"</span> % <span class="hljs-string">"1.10.19"</span> % <span class="hljs-string">"test"</span>
+)
+
+assemblyMergeStrategy in assembly := {
+  <span class="hljs-keyword">case</span> path <span class="hljs-keyword">if</span> path contains <span class="hljs-string">"pom."</span> =&gt; <span class="hljs-type">MergeStrategy</span>.first
+  <span class="hljs-keyword">case</span> path <span class="hljs-keyword">if</span> path contains <span class="hljs-string">"javax.inject.Named"</span> =&gt; <span class="hljs-type">MergeStrategy</span>.first
+  <span class="hljs-keyword">case</span> path <span class="hljs-keyword">if</span> path contains <span class="hljs-string">"mime.types"</span> =&gt; <span class="hljs-type">MergeStrategy</span>.first
+  <span class="hljs-keyword">case</span> path <span class="hljs-keyword">if</span> path contains <span class="hljs-string">"org/apache/commons/logging/impl/SimpleLog.class"</span> =&gt; <span class="hljs-type">MergeStrategy</span>.first
+  <span class="hljs-keyword">case</span> path <span class="hljs-keyword">if</span> path contains <span class="hljs-string">"org/apache/commons/logging/impl/SimpleLog$1.class"</span> =&gt; <span class="hljs-type">MergeStrategy</span>.first
+  <span class="hljs-keyword">case</span> path <span class="hljs-keyword">if</span> path contains <span class="hljs-string">"org/apache/commons/logging/impl/NoOpLog.class"</span> =&gt; <span class="hljs-type">MergeStrategy</span>.first
+  <span class="hljs-keyword">case</span> path <span class="hljs-keyword">if</span> path contains <span class="hljs-string">"org/apache/commons/logging/LogFactory.class"</span> =&gt; <span class="hljs-type">MergeStrategy</span>.first
+  <span class="hljs-keyword">case</span> path <span class="hljs-keyword">if</span> path contains <span class="hljs-string">"org/apache/commons/logging/LogConfigurationException.class"</span> =&gt; <span class="hljs-type">MergeStrategy</span>.first
+  <span class="hljs-keyword">case</span> path <span class="hljs-keyword">if</span> path contains <span class="hljs-string">"org/apache/commons/logging/Log.class"</span> =&gt; <span class="hljs-type">MergeStrategy</span>.first
+  <span class="hljs-keyword">case</span> path <span class="hljs-keyword">if</span> path contains <span class="hljs-string">"META-INF/jersey-module-version"</span> =&gt; <span class="hljs-type">MergeStrategy</span>.first
+  <span class="hljs-keyword">case</span> path <span class="hljs-keyword">if</span> path contains <span class="hljs-string">".properties"</span> =&gt; <span class="hljs-type">MergeStrategy</span>.first
+  <span class="hljs-keyword">case</span> path <span class="hljs-keyword">if</span> path contains <span class="hljs-string">".class"</span> =&gt; <span class="hljs-type">MergeStrategy</span>.first
+  <span class="hljs-keyword">case</span> x =&gt;
+    <span class="hljs-keyword">val</span> oldStrategy = (assemblyMergeStrategy in assembly).value
+    oldStrategy(x)
+}
+</code></pre>
+</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/0.20.0/operations/segment-optimization.html"><span class="arrow-prev">← </span><span>Segment Size Optimization</span></a><a class="docs-next button" href="/docs/0.20.0/development/overview.html"><span>Developing on Druid</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"></nav></div><footer class="nav-footer druid-footer" id="footer"><div class="container"><div class="text-center"><p><a href="/technology">Technology</a> · <a href="/use-cases">Use Cases</a> · <a href="/druid-powered">Powered by Druid</a> · <a href="/docs/0.20.0/latest">Docs</a> · <a href="/community/">Community</a> · <a href="/downloads.html">Download</a> · <a href="/faq">FAQ</a></p></div><div class="text-center"><a title="Join the user group" href="https://groups.google.com/forum/#!forum/druid-user" target="_blank"><span class="fa fa-comments"></span></a> · <a title="Follow Druid" href="https://twitter.com/druidio" target="_blank"><span class="fab fa-twitter"></span></a> · <a title="Download via Apache" href="https://www.apache.org/dyn/closer.cgi?path=/incubator/druid/{{ site.druid_versions[0].versions[0].version }}/apache-druid-{{ site.druid_versions[0].versions[0].version }}-bin.tar.gz" target="_blank"><span class="fas fa-feather"></span></a> · <a title="GitHub" href="https://github.com/apache/druid" target="_blank"><span class="fab fa-github"></span></a></div><div class="text-center license">Copyright © 2019 <a href="https://www.apache.org/" target="_blank">Apache Software Foundation</a>.<br/>Except where otherwise noted, licensed under <a rel="license" href="http://creativecommons.org/licenses/by-sa/4.0/">CC BY-SA 4.0</a>.<br/>Apache Druid, Druid, and the Druid logo are either registered trademarks or trademarks of The Apache Software Foundation in the United States and other countries.</div></div></footer></div><script type="text/javascript" src="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.js"></script><script>
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diff --git a/docs/0.20.0/querying/aggregations.html b/docs/0.20.0/querying/aggregations.html
new file mode 100644
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+++ b/docs/0.20.0/querying/aggregations.html
@@ -0,0 +1,358 @@
+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Aggregations · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/0.20.0/querying/aggregations.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.20.0" /><meta property="og:title" content="Aggregations · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
+              window.dataLayer = window.dataLayer || [];
+              function gtag(){dataLayer.push(arguments); }
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class="icon-toc"></i></div></div><div class="navGroups"><div class="navGroup"><h3 class="navGroupCategoryTitle collapsible">Getting started<span class="arrow"><svg width="24" height="24" viewBox="0 0 24 24"><path fill="#565656" d="M7.41 15.41L12 10.83l4.59 4.58L18 14l-6-6-6 6z"></path><path d="M0 0h24v24H0z" fill="none"></path></svg></span></h3><ul class="hide"><li class="navListItem"><a class="navItem" href="/docs/0.20.0/design/index.html">Introduction to Apache Druid</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/tutorials/index.html">Quickstart</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/tutorials/docker.html">Docker</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/operations/single-server.html">Single server deployment</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/tutorials/cluster.html">Clustered deployment</a></li></ul></div><div class="navGroup"><h3 class="navGroupCategoryTitle collapsible">Tutorials<span class="arrow"><svg width="24" height="24" viewBox="0 0 24 24"><path fill="#565656" d="M7.41 15.41L12 10.83l4.59 4.58L18 14l-6-6-6 6z"></path><path d="M0 0h24v24H0z" fill="none"></path></svg></span></h3><ul class="hide"><li class="navListItem"><a class="navItem" href="/docs/0.20.0/tutorials/tutorial-batch.html">Loading files natively</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/tutorials/tutorial-kafka.html">Load from Apache Kafka</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/tutorials/tutorial-batch-hadoop.html">Load from Apache Hadoop</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/tutorials/tutorial-query.html">Querying data</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/tutorials/tutorial-rollup.html">Roll-up</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/tutorials/tutorial-retention.html">Configuring data retention</a></li><li 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+<blockquote>
+<p>Apache Druid supports two query languages: <a href="/docs/0.20.0/querying/sql.html">Druid SQL</a> and <a href="/docs/0.20.0/querying/querying.html">native queries</a>.
+This document describes the native
+language. For information about aggregators available in SQL, refer to the
+<a href="/docs/0.20.0/querying/sql.html#aggregation-functions">SQL documentation</a>.</p>
+</blockquote>
+<p>Aggregations can be provided at ingestion time as part of the ingestion spec as a way of summarizing data before it enters Apache Druid.
+Aggregations can also be specified as part of many queries at query time.</p>
+<p>Available aggregations are:</p>
+<h3><a class="anchor" aria-hidden="true" id="count-aggregator"></a><a href="#count-aggregator" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Count aggregator</h3>
+<p><code>count</code> computes the count of Druid rows that match the filters.</p>
+<pre><code class="hljs css language-json">{ <span class="hljs-attr">"type"</span> : <span class="hljs-string">"count"</span>, <span class="hljs-attr">"name"</span> : &lt;output_name&gt; }
+</code></pre>
+<p>Please note the count aggregator counts the number of Druid rows, which does not always reflect the number of raw events ingested.
+This is because Druid can be configured to roll up data at ingestion time. To
+count the number of ingested rows of data, include a count aggregator at ingestion time, and a longSum aggregator at
+query time.</p>
+<h3><a class="anchor" aria-hidden="true" id="sum-aggregators"></a><a href="#sum-aggregators" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Sum aggregators</h3>
+<h4><a class="anchor" aria-hidden="true" id="longsum-aggregator"></a><a href="#longsum-aggregator" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a><code>longSum</code> aggregator</h4>
+<p>computes the sum of values as a 64-bit, signed integer</p>
+<pre><code class="hljs css language-json">{ <span class="hljs-attr">"type"</span> : <span class="hljs-string">"longSum"</span>, <span class="hljs-attr">"name"</span> : &lt;output_name&gt;, <span class="hljs-attr">"fieldName"</span> : &lt;metric_name&gt; }
+</code></pre>
+<p><code>name</code> – output name for the summed value
+<code>fieldName</code> – name of the metric column to sum over</p>
+<h4><a class="anchor" aria-hidden="true" id="doublesum-aggregator"></a><a href="#doublesum-aggregator" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a><code>doubleSum</code> aggregator</h4>
+<p>Computes and stores the sum of values as 64-bit floating point value. Similar to <code>longSum</code></p>
+<pre><code class="hljs css language-json">{ <span class="hljs-attr">"type"</span> : <span class="hljs-string">"doubleSum"</span>, <span class="hljs-attr">"name"</span> : &lt;output_name&gt;, <span class="hljs-attr">"fieldName"</span> : &lt;metric_name&gt; }
+</code></pre>
+<h4><a class="anchor" aria-hidden="true" id="floatsum-aggregator"></a><a href="#floatsum-aggregator" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a><code>floatSum</code> aggregator</h4>
+<p>Computes and stores the sum of values as 32-bit floating point value. Similar to <code>longSum</code> and <code>doubleSum</code></p>
+<pre><code class="hljs css language-json">{ <span class="hljs-attr">"type"</span> : <span class="hljs-string">"floatSum"</span>, <span class="hljs-attr">"name"</span> : &lt;output_name&gt;, <span class="hljs-attr">"fieldName"</span> : &lt;metric_name&gt; }
+</code></pre>
+<h3><a class="anchor" aria-hidden="true" id="min--max-aggregators"></a><a href="#min--max-aggregators" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Min / Max aggregators</h3>
+<h4><a class="anchor" aria-hidden="true" id="doublemin-aggregator"></a><a href="#doublemin-aggregator" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a><code>doubleMin</code> aggregator</h4>
+<p><code>doubleMin</code> computes the minimum of all metric values and Double.POSITIVE_INFINITY</p>
+<pre><code class="hljs css language-json">{ <span class="hljs-attr">"type"</span> : <span class="hljs-string">"doubleMin"</span>, <span class="hljs-attr">"name"</span> : &lt;output_name&gt;, <span class="hljs-attr">"fieldName"</span> : &lt;metric_name&gt; }
+</code></pre>
+<h4><a class="anchor" aria-hidden="true" id="doublemax-aggregator"></a><a href="#doublemax-aggregator" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a><code>doubleMax</code> aggregator</h4>
+<p><code>doubleMax</code> computes the maximum of all metric values and Double.NEGATIVE_INFINITY</p>
+<pre><code class="hljs css language-json">{ <span class="hljs-attr">"type"</span> : <span class="hljs-string">"doubleMax"</span>, <span class="hljs-attr">"name"</span> : &lt;output_name&gt;, <span class="hljs-attr">"fieldName"</span> : &lt;metric_name&gt; }
+</code></pre>
+<h4><a class="anchor" aria-hidden="true" id="floatmin-aggregator"></a><a href="#floatmin-aggregator" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a><code>floatMin</code> aggregator</h4>
+<p><code>floatMin</code> computes the minimum of all metric values and Float.POSITIVE_INFINITY</p>
+<pre><code class="hljs css language-json">{ <span class="hljs-attr">"type"</span> : <span class="hljs-string">"floatMin"</span>, <span class="hljs-attr">"name"</span> : &lt;output_name&gt;, <span class="hljs-attr">"fieldName"</span> : &lt;metric_name&gt; }
+</code></pre>
+<h4><a class="anchor" aria-hidden="true" id="floatmax-aggregator"></a><a href="#floatmax-aggregator" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a><code>floatMax</code> aggregator</h4>
+<p><code>floatMax</code> computes the maximum of all metric values and Float.NEGATIVE_INFINITY</p>
+<pre><code class="hljs css language-json">{ <span class="hljs-attr">"type"</span> : <span class="hljs-string">"floatMax"</span>, <span class="hljs-attr">"name"</span> : &lt;output_name&gt;, <span class="hljs-attr">"fieldName"</span> : &lt;metric_name&gt; }
+</code></pre>
+<h4><a class="anchor" aria-hidden="true" id="longmin-aggregator"></a><a href="#longmin-aggregator" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a><code>longMin</code> aggregator</h4>
+<p><code>longMin</code> computes the minimum of all metric values and Long.MAX_VALUE</p>
+<pre><code class="hljs css language-json">{ <span class="hljs-attr">"type"</span> : <span class="hljs-string">"longMin"</span>, <span class="hljs-attr">"name"</span> : &lt;output_name&gt;, <span class="hljs-attr">"fieldName"</span> : &lt;metric_name&gt; }
+</code></pre>
+<h4><a class="anchor" aria-hidden="true" id="longmax-aggregator"></a><a href="#longmax-aggregator" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a><code>longMax</code> aggregator</h4>
+<p><code>longMax</code> computes the maximum of all metric values and Long.MIN_VALUE</p>
+<pre><code class="hljs css language-json">{ <span class="hljs-attr">"type"</span> : <span class="hljs-string">"longMax"</span>, <span class="hljs-attr">"name"</span> : &lt;output_name&gt;, <span class="hljs-attr">"fieldName"</span> : &lt;metric_name&gt; }
+</code></pre>
+<h3><a class="anchor" aria-hidden="true" id="doublemean-aggregator"></a><a href="#doublemean-aggregator" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a><code>doubleMean</code> aggregator</h3>
+<p>Computes and returns arithmetic mean of a column values as 64 bit float value. This is a query time aggregator only and should not be used during indexing.</p>
+<pre><code class="hljs css language-json">{ <span class="hljs-attr">"type"</span> : <span class="hljs-string">"doubleMean"</span>, <span class="hljs-attr">"name"</span> : &lt;output_name&gt;, <span class="hljs-attr">"fieldName"</span> : &lt;metric_name&gt; }
+</code></pre>
+<h3><a class="anchor" aria-hidden="true" id="first--last-aggregator"></a><a href="#first--last-aggregator" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>First / Last aggregator</h3>
+<p>(Double/Float/Long) First and Last aggregator cannot be used in ingestion spec, and should only be specified as part of queries.</p>
+<p>Note that queries with first/last aggregators on a segment created with rollup enabled will return the rolled up value, and not the last value within the raw ingested data.</p>
+<h4><a class="anchor" aria-hidden="true" id="doublefirst-aggregator"></a><a href="#doublefirst-aggregator" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a><code>doubleFirst</code> aggregator</h4>
+<p><code>doubleFirst</code> computes the metric value with the minimum timestamp or 0 in default mode or <code>null</code> in SQL compatible mode if no row exist</p>
+<pre><code class="hljs css language-json">{
+  <span class="hljs-attr">"type"</span> : <span class="hljs-string">"doubleFirst"</span>,
+  <span class="hljs-attr">"name"</span> : &lt;output_name&gt;,
+  <span class="hljs-attr">"fieldName"</span> : &lt;metric_name&gt;
+}
+</code></pre>
+<h4><a class="anchor" aria-hidden="true" id="doublelast-aggregator"></a><a href="#doublelast-aggregator" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a><code>doubleLast</code> aggregator</h4>
+<p><code>doubleLast</code> computes the metric value with the maximum timestamp or 0 in default mode or <code>null</code> in SQL compatible mode if no row exist</p>
+<pre><code class="hljs css language-json">{
+  <span class="hljs-attr">"type"</span> : <span class="hljs-string">"doubleLast"</span>,
+  <span class="hljs-attr">"name"</span> : &lt;output_name&gt;,
+  <span class="hljs-attr">"fieldName"</span> : &lt;metric_name&gt;
+}
+</code></pre>
+<h4><a class="anchor" aria-hidden="true" id="floatfirst-aggregator"></a><a href="#floatfirst-aggregator" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a><code>floatFirst</code> aggregator</h4>
+<p><code>floatFirst</code> computes the metric value with the minimum timestamp or 0 in default mode or <code>null</code> in SQL compatible mode if no row exist</p>
+<pre><code class="hljs css language-json">{
+  <span class="hljs-attr">"type"</span> : <span class="hljs-string">"floatFirst"</span>,
+  <span class="hljs-attr">"name"</span> : &lt;output_name&gt;,
+  <span class="hljs-attr">"fieldName"</span> : &lt;metric_name&gt;
+}
+</code></pre>
+<h4><a class="anchor" aria-hidden="true" id="floatlast-aggregator"></a><a href="#floatlast-aggregator" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a><code>floatLast</code> aggregator</h4>
+<p><code>floatLast</code> computes the metric value with the maximum timestamp or 0 in default mode or <code>null</code> in SQL compatible mode if no row exist</p>
+<pre><code class="hljs css language-json">{
+  <span class="hljs-attr">"type"</span> : <span class="hljs-string">"floatLast"</span>,
+  <span class="hljs-attr">"name"</span> : &lt;output_name&gt;,
+  <span class="hljs-attr">"fieldName"</span> : &lt;metric_name&gt;
+}
+</code></pre>
+<h4><a class="anchor" aria-hidden="true" id="longfirst-aggregator"></a><a href="#longfirst-aggregator" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a><code>longFirst</code> aggregator</h4>
+<p><code>longFirst</code> computes the metric value with the minimum timestamp or 0 in default mode or <code>null</code> in SQL compatible mode if no row exist</p>
+<pre><code class="hljs css language-json">{
+  <span class="hljs-attr">"type"</span> : <span class="hljs-string">"longFirst"</span>,
+  <span class="hljs-attr">"name"</span> : &lt;output_name&gt;,
+  <span class="hljs-attr">"fieldName"</span> : &lt;metric_name&gt;
+}
+</code></pre>
+<h4><a class="anchor" aria-hidden="true" id="longlast-aggregator"></a><a href="#longlast-aggregator" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a><code>longLast</code> aggregator</h4>
+<p><code>longLast</code> computes the metric value with the maximum timestamp or 0 in default mode or <code>null</code> in SQL compatible mode if no row exist</p>
+<pre><code class="hljs css language-json">{
+  <span class="hljs-attr">"type"</span> : <span class="hljs-string">"longLast"</span>,
+  <span class="hljs-attr">"name"</span> : &lt;output_name&gt;,
+  <span class="hljs-attr">"fieldName"</span> : &lt;metric_name&gt;,
+}
+</code></pre>
+<h4><a class="anchor" aria-hidden="true" id="stringfirst-aggregator"></a><a href="#stringfirst-aggregator" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a><code>stringFirst</code> aggregator</h4>
+<p><code>stringFirst</code> computes the metric value with the minimum timestamp or <code>null</code> if no row exist</p>
+<pre><code class="hljs css language-json">{
+  "type" : "stringFirst",
+  "name" : &lt;output_name&gt;,
+  "fieldName" : &lt;metric_name&gt;,
+  "maxStringBytes" : &lt;integer&gt; # (optional, defaults to 1024)
+}
+</code></pre>
+<h4><a class="anchor" aria-hidden="true" id="stringlast-aggregator"></a><a href="#stringlast-aggregator" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a><code>stringLast</code> aggregator</h4>
+<p><code>stringLast</code> computes the metric value with the maximum timestamp or <code>null</code> if no row exist</p>
+<pre><code class="hljs css language-json">{
+  "type" : "stringLast",
+  "name" : &lt;output_name&gt;,
+  "fieldName" : &lt;metric_name&gt;,
+  "maxStringBytes" : &lt;integer&gt; # (optional, defaults to 1024)
+}
+</code></pre>
+<h3><a class="anchor" aria-hidden="true" id="any-aggregator"></a><a href="#any-aggregator" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>ANY aggregator</h3>
+<p>(Double/Float/Long/String) ANY aggregator cannot be used in ingestion spec, and should only be specified as part of queries.</p>
+<p>Returns any value including null. This aggregator can simplify and optimize the performance by returning the first encountered value (including null)</p>
+<h4><a class="anchor" aria-hidden="true" id="doubleany-aggregator"></a><a href="#doubleany-aggregator" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a><code>doubleAny</code> aggregator</h4>
+<p><code>doubleAny</code> returns any double metric value</p>
+<pre><code class="hljs css language-json">{
+  <span class="hljs-attr">"type"</span> : <span class="hljs-string">"doubleAny"</span>,
+  <span class="hljs-attr">"name"</span> : &lt;output_name&gt;,
+  <span class="hljs-attr">"fieldName"</span> : &lt;metric_name&gt;
+}
+</code></pre>
+<h4><a class="anchor" aria-hidden="true" id="floatany-aggregator"></a><a href="#floatany-aggregator" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a><code>floatAny</code> aggregator</h4>
+<p><code>floatAny</code> returns any float metric value</p>
+<pre><code class="hljs css language-json">{
+  <span class="hljs-attr">"type"</span> : <span class="hljs-string">"floatAny"</span>,
+  <span class="hljs-attr">"name"</span> : &lt;output_name&gt;,
+  <span class="hljs-attr">"fieldName"</span> : &lt;metric_name&gt;
+}
+</code></pre>
+<h4><a class="anchor" aria-hidden="true" id="longany-aggregator"></a><a href="#longany-aggregator" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a><code>longAny</code> aggregator</h4>
+<p><code>longAny</code> returns any long metric value</p>
+<pre><code class="hljs css language-json">{
+  <span class="hljs-attr">"type"</span> : <span class="hljs-string">"longAny"</span>,
+  <span class="hljs-attr">"name"</span> : &lt;output_name&gt;,
+  <span class="hljs-attr">"fieldName"</span> : &lt;metric_name&gt;,
+}
+</code></pre>
+<h4><a class="anchor" aria-hidden="true" id="stringany-aggregator"></a><a href="#stringany-aggregator" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a><code>stringAny</code> aggregator</h4>
+<p><code>stringAny</code> returns any string metric value</p>
+<pre><code class="hljs css language-json">{
+  "type" : "stringAny",
+  "name" : &lt;output_name&gt;,
+  "fieldName" : &lt;metric_name&gt;,
+  "maxStringBytes" : &lt;integer&gt; # (optional, defaults to 1024),
+}
+</code></pre>
+<h3><a class="anchor" aria-hidden="true" id="javascript-aggregator"></a><a href="#javascript-aggregator" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>JavaScript aggregator</h3>
+<p>Computes an arbitrary JavaScript function over a set of columns (both metrics and dimensions are allowed). Your
+JavaScript functions are expected to return floating-point values.</p>
+<pre><code class="hljs css language-json">{ "type": "javascript",
+  "name": "&lt;output_name&gt;",
+  "fieldNames"  : [ &lt;column1&gt;, &lt;column2&gt;, ... ],
+  "fnAggregate" : "function(current, column1, column2, ...) {
+                     &lt;updates partial aggregate (current) based on the current row values&gt;
+                     return &lt;updated partial aggregate&gt;
+                   }",
+  "fnCombine"   : "function(partialA, partialB) { return &lt;combined partial results&gt;; }",
+  "fnReset"     : "function()                   { return &lt;initial value&gt;; }"
+}
+</code></pre>
+<p><strong>Example</strong></p>
+<pre><code class="hljs css language-json">{
+  <span class="hljs-attr">"type"</span>: <span class="hljs-string">"javascript"</span>,
+  <span class="hljs-attr">"name"</span>: <span class="hljs-string">"sum(log(x)*y) + 10"</span>,
+  <span class="hljs-attr">"fieldNames"</span>: [<span class="hljs-string">"x"</span>, <span class="hljs-string">"y"</span>],
+  <span class="hljs-attr">"fnAggregate"</span> : <span class="hljs-string">"function(current, a, b)      { return current + (Math.log(a) * b); }"</span>,
+  <span class="hljs-attr">"fnCombine"</span>   : <span class="hljs-string">"function(partialA, partialB) { return partialA + partialB; }"</span>,
+  <span class="hljs-attr">"fnReset"</span>     : <span class="hljs-string">"function()                   { return 10; }"</span>
+}
+</code></pre>
+<blockquote>
+<p>JavaScript-based functionality is disabled by default. Please refer to the Druid <a href="/docs/0.20.0/development/javascript.html">JavaScript programming guide</a> for guidelines about using Druid's JavaScript functionality, including instructions on how to enable it.</p>
+</blockquote>
+<p><a name="approx"></a></p>
+<h2><a class="anchor" aria-hidden="true" id="approximate-aggregations"></a><a href="#approximate-aggregations" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Approximate Aggregations</h2>
+<h3><a class="anchor" aria-hidden="true" id="count-distinct"></a><a href="#count-distinct" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Count distinct</h3>
+<h4><a class="anchor" aria-hidden="true" id="apache-datasketches-theta-sketch"></a><a href="#apache-datasketches-theta-sketch" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Apache DataSketches Theta Sketch</h4>
+<p>The <a href="/docs/0.20.0/development/extensions-core/datasketches-theta.html">DataSketches Theta Sketch</a> extension-provided aggregator gives distinct count estimates with support for set union, intersection, and difference post-aggregators, using Theta sketches from the <a href="https://datasketches.apache.org/">Apache DataSketches</a> library.</p>
+<h4><a class="anchor" aria-hidden="true" id="apache-datasketches-hll-sketch"></a><a href="#apache-datasketches-hll-sketch" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Apache DataSketches HLL Sketch</h4>
+<p>The <a href="/docs/0.20.0/development/extensions-core/datasketches-hll.html">DataSketches HLL Sketch</a> extension-provided aggregator gives distinct count estimates using the HyperLogLog algorithm.</p>
+<p>Compared to the Theta sketch, the HLL sketch does not support set operations and has slightly slower update and merge speed, but requires significantly less space.</p>
+<h4><a class="anchor" aria-hidden="true" id="cardinality-hyperunique"></a><a href="#cardinality-hyperunique" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Cardinality, hyperUnique</h4>
+<blockquote>
+<p>For new use cases, we recommend evaluating <a href="/docs/0.20.0/development/extensions-core/datasketches-theta.html">DataSketches Theta Sketch</a> or <a href="/docs/0.20.0/development/extensions-core/datasketches-hll.html">DataSketches HLL Sketch</a> instead.
+The DataSketches aggregators are generally able to offer more flexibility and better accuracy than the classic Druid <code>cardinality</code> and <code>hyperUnique</code> aggregators.</p>
+</blockquote>
+<p>The <a href="/docs/0.20.0/querying/hll-old.html">Cardinality and HyperUnique</a> aggregators are older aggregator implementations available by default in Druid that also provide distinct count estimates using the HyperLogLog algorithm. The newer DataSketches Theta and HLL extension-provided aggregators described above have superior accuracy and performance and are recommended instead.</p>
+<p>The DataSketches team has published a <a href="https://datasketches.apache.org/docs/HLL/HllSketchVsDruidHyperLogLogCollector.html">comparison study</a> between Druid's original HLL algorithm and the DataSketches HLL algorithm. Based on the demonstrated advantages of the DataSketches implementation, we are recommending using them in preference to Druid's original HLL-based aggregators.
+However, to ensure backwards compatibility, we will continue to support the classic aggregators.</p>
+<p>Please note that <code>hyperUnique</code> aggregators are not mutually compatible with Datasketches HLL or Theta sketches.</p>
+<h5><a class="anchor" aria-hidden="true" id="multi-column-handling"></a><a href="#multi-column-handling" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Multi-column handling</h5>
+<p>Note the DataSketches Theta and HLL aggregators currently only support single-column inputs. If you were previously using the Cardinality aggregator with multiple-column inputs, equivalent operations using Theta or HLL sketches are described below:</p>
+<ul>
+<li>Multi-column <code>byValue</code> Cardinality can be replaced with a union of Theta sketches on the individual input columns</li>
+<li>Multi-column <code>byRow</code> Cardinality can be replaced with a Theta or HLL sketch on a single <a href="/docs/0.20.0/querying/virtual-columns.html">virtual column</a> that combines the individual input columns.</li>
+</ul>
+<h3><a class="anchor" aria-hidden="true" id="histograms-and-quantiles"></a><a href="#histograms-and-quantiles" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Histograms and quantiles</h3>
+<h4><a class="anchor" aria-hidden="true" id="datasketches-quantiles-sketch"></a><a href="#datasketches-quantiles-sketch" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>DataSketches Quantiles Sketch</h4>
+<p>The <a href="/docs/0.20.0/development/extensions-core/datasketches-quantiles.html">DataSketches Quantiles Sketch</a> extension-provided aggregator provides quantile estimates and histogram approximations using the numeric quantiles DoublesSketch from the <a href="https://datasketches.apache.org/">datasketches</a> library.</p>
+<p>We recommend this aggregator in general for quantiles/histogram use cases, as it provides formal error bounds and has distribution-independent accuracy.</p>
+<h4><a class="anchor" aria-hidden="true" id="moments-sketch-experimental"></a><a href="#moments-sketch-experimental" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Moments Sketch (Experimental)</h4>
+<p>The <a href="/docs/0.20.0/development/extensions-contrib/momentsketch-quantiles.html">Moments Sketch</a> extension-provided aggregator is an experimental aggregator that provides quantile estimates using the <a href="https://github.com/stanford-futuredata/momentsketch">Moments Sketch</a>.</p>
+<p>The Moments Sketch aggregator is provided as an experimental option. It is optimized for merging speed and it can have higher aggregation performance compared to the DataSketches quantiles aggregator. However, the accuracy of the Moments Sketch is distribution-dependent, so users will need to empirically verify that the aggregator is suitable for their input data.</p>
+<p>As a general guideline for experimentation, the <a href="https://arxiv.org/pdf/1803.01969.pdf">Moments Sketch paper</a> points out that this algorithm works better on inputs with high entropy. In particular, the algorithm is not a good fit when the input data consists of a small number of clustered discrete values.</p>
+<h4><a class="anchor" aria-hidden="true" id="fixed-buckets-histogram"></a><a href="#fixed-buckets-histogram" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Fixed Buckets Histogram</h4>
+<p>Druid also provides a <a href="../development/extensions-core/approximate-histograms.html#fixed-buckets-histogram">simple histogram implementation</a> that uses a fixed range and fixed number of buckets with support for quantile estimation, backed by an array of bucket count values.</p>
+<p>The fixed buckets histogram can perform well when the distribution of the input data allows a small number of buckets to be used.</p>
+<p>We do not recommend the fixed buckets histogram for general use, as its usefulness is extremely data dependent. However, it is made available for users that have already identified use cases where a fixed buckets histogram is suitable.</p>
+<h4><a class="anchor" aria-hidden="true" id="approximate-histogram-deprecated"></a><a href="#approximate-histogram-deprecated" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Approximate Histogram (deprecated)</h4>
+<blockquote>
+<p>The Approximate Histogram aggregator is deprecated.
+There are a number of other quantile estimation algorithms that offer better performance, accuracy, and memory footprint.
+We recommend using <a href="/docs/0.20.0/development/extensions-core/datasketches-quantiles.html">DataSketches Quantiles</a> instead.</p>
+</blockquote>
+<p>The <a href="/docs/0.20.0/development/extensions-core/approximate-histograms.html">Approximate Histogram</a> extension-provided aggregator also provides quantile estimates and histogram approximations, based on <a href="http://jmlr.org/papers/volume11/ben-haim10a/ben-haim10a.pdf">http://jmlr.org/papers/volume11/ben-haim10a/ben-haim10a.pdf</a>.</p>
+<p>The algorithm used by this deprecated aggregator is highly distribution-dependent and its output is subject to serious distortions when the input does not fit within the algorithm's limitations.</p>
+<p>A <a href="https://datasketches.apache.org/docs/Quantiles/DruidApproxHistogramStudy.html">study published by the DataSketches team</a> demonstrates some of the known failure modes of this algorithm:</p>
+<ul>
+<li>The algorithm's quantile calculations can fail to provide results for a large range of rank values (all ranks less than 0.89 in the example used in the study), returning all zeroes instead.</li>
+<li>The algorithm can completely fail to record spikes in the tail ends of the distribution</li>
+<li>In general, the histogram produced by the algorithm can deviate significantly from the true histogram, with no bounds on the errors.</li>
+</ul>
+<p>It is not possible to determine a priori how well this aggregator will behave for a given input stream, nor does the aggregator provide any indication that serious distortions are present in the output.</p>
+<p>For these reasons, we have deprecated this aggregator and recommend using the DataSketches Quantiles aggregator instead for new and existing use cases, although we will continue to support Approximate Histogram for backwards compatibility.</p>
+<h2><a class="anchor" aria-hidden="true" id="miscellaneous-aggregations"></a><a href="#miscellaneous-aggregations" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Miscellaneous Aggregations</h2>
+<h3><a class="anchor" aria-hidden="true" id="filtered-aggregator"></a><a href="#filtered-aggregator" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Filtered Aggregator</h3>
+<p>A filtered aggregator wraps any given aggregator, but only aggregates the values for which the given dimension filter matches.</p>
+<p>This makes it possible to compute the results of a filtered and an unfiltered aggregation simultaneously, without having to issue multiple queries, and use both results as part of post-aggregations.</p>
+<p><em>Note:</em> If only the filtered results are required, consider putting the filter on the query itself, which will be much faster since it does not require scanning all the data.</p>
+<pre><code class="hljs css language-json">{
+  <span class="hljs-attr">"type"</span> : <span class="hljs-string">"filtered"</span>,
+  <span class="hljs-attr">"filter"</span> : {
+    <span class="hljs-attr">"type"</span> : <span class="hljs-string">"selector"</span>,
+    <span class="hljs-attr">"dimension"</span> : &lt;dimension&gt;,
+    <span class="hljs-attr">"value"</span> : &lt;dimension value&gt;
+  }
+  <span class="hljs-string">"aggregator"</span> : &lt;aggregation&gt;
+}
+</code></pre>
+</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/0.20.0/querying/dimensionspecs.html"><span class="arrow-prev">← </span><span>Dimensions</span></a><a class="docs-next button" href="/docs/0.20.0/querying/post-aggregations.html"><span>Post-aggregations</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#approximate-aggregations">Approximate Aggregations</a><ul class="toc-headings"><li><a href="#count-distinct">Count distinct</a></li><li><a href="#histograms-and-quantiles">Histograms and quantiles</a></li></ul></li><li><a href="#miscellaneous-aggregations">Miscellaneous Aggregations</a><ul class="toc-headings"><li><a href="#filtered-aggregator">Filtered Aggregator</a></li></ul></li></ul></nav></div><footer class="nav-footer druid-footer" id="footer"><div class="container"><div class="text-center"><p><a href="/technology">Technology</a> · <a href="/use-cases">Use Cases</a> · <a href="/druid-powered">Powered by Druid</a> · <a href="/docs/0.20.0/latest">Docs</a> · <a href="/community/">Community</a> · <a href="/downloads.html">Download</a> · <a href="/faq">FAQ</a></p></div><div class="text-center"><a title="Join the user group" href="https://groups.google.com/forum/#!forum/druid-user" target="_blank"><span class="fa fa-comments"></span></a> · <a title="Follow Druid" href="https://twitter.com/druidio" target="_blank"><span class="fab fa-twitter"></span></a> · <a title="Download via Apache" href="https://www.apache.org/dyn/closer.cgi?path=/incubator/druid/{{ site.druid_versions[0].versions[0].version }}/apache-druid-{{ site.druid_versions[0].versions[0].version }}-bin.tar.gz" target="_blank"><span class="fas fa-feather"></span></a> · <a title="GitHub" href="https://github.com/apache/druid" target="_blank"><span class="fab fa-github"></span></a></div><div class="text-center license">Copyright © 2019 <a href="https://www.apache.org/" target="_blank">Apache Software Foundation</a>.<br/>Except where otherwise noted, licensed under <a rel="license" href="http://creativecommons.org/licenses/by-sa/4.0/">CC BY-SA 4.0</a>.<br/>Apache Druid, Druid, and the Druid logo are either registered trademarks or trademarks of The Apache Software Foundation in the United States and other countries.</div></div></footer></div><script type="text/javascript" src="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.js"></script><script>
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+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Query caching · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/0.20.0/querying/caching.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.20.0" /><meta property="og:title" content="Query caching · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
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class="icon-toc"></i></div></div><div class="navGroups"><div class="navGroup"><h3 class="navGroupCategoryTitle collapsible">Getting started<span class="arrow"><svg width="24" height="24" viewBox="0 0 24 24"><path fill="#565656" d="M7.41 15.41L12 10.83l4.59 4.58L18 14l-6-6-6 6z"></path><path d="M0 0h24v24H0z" fill="none"></path></svg></span></h3><ul class="hide"><li class="navListItem"><a class="navItem" href="/docs/0.20.0/design/index.html">Introduction to Apache Druid</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/tutorials/index.html">Quickstart</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/tutorials/docker.html">Docker</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/operations/single-server.html">Single server deployment</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/tutorials/cluster.html">Clustered deployment</a></li></ul></div><div class="navGroup"><h3 class="navGroupCategoryTitle 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href="/docs/0.20.0/ingestion/tranquility.html">Tranquility</a></li></ul></div><div class="navGroup subNavGroup"><h4 class="navGroupSubcategoryTitle">Batch ingestion</h4><ul><li class="navListItem"><a class="navItem" href="/docs/0.20.0/ingestion/native-batch.html">Native batch</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/ingestion/hadoop.html">Hadoop-based</a></li></ul></div><li class="navListItem"><a class="navItem" href="/docs/0.20.0/ingestion/tasks.html">Task reference</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/ingestion/faq.html">Troubleshooting FAQ</a></li></ul></div><div class="navGroup"><h3 class="navGroupCategoryTitle collapsible">Querying<span class="arrow"><svg width="24" height="24" viewBox="0 0 24 24"><path fill="#565656" d="M7.41 15.41L12 10.83l4.59 4.58L18 14l-6-6-6 6z"></path><path d="M0 0h24v24H0z" fill="none"></path></svg></span></h3><ul class="hide"><li class="navListItem"><a class="navItem" href="/docs/0.20.0/querying/sql.html">Druid SQL</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/querying/querying.html">Native queries</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/querying/query-execution.html">Query execution</a></li><div class="navGroup subNavGroup"><h4 class="navGroupSubcategoryTitle">Concepts</h4><ul><li class="navListItem"><a class="navItem" href="/docs/0.20.0/querying/datasource.html">Datasources</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/querying/joins.html">Joins</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/querying/lookups.html">Lookups</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/querying/multi-value-dimensions.html">Multi-value dimensions</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/querying/multitenancy.html">Multitenancy</a></li><li class="navListItem navListItemActive"><a class="navItem" href="/docs/0.20.0/querying/caching.html">Query caching</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/querying/query-context.html">Context parameters</a></li></ul></div><div class="navGroup subNavGroup"><h4 class="navGroupSubcategoryTitle">Native query types</h4><ul><li class="navListItem"><a class="navItem" href="/docs/0.20.0/querying/timeseriesquery.html">Timeseries</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/querying/topnquery.html">TopN</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/querying/groupbyquery.html">GroupBy</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/querying/scan-query.html">Scan</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/querying/searchquery.html">Search</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/querying/timeboundaryquery.html">TimeBoundary</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/querying/segmentmetadataquery.html">SegmentMetadata</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/querying/datasourcemetadataquery.html">DatasourceMetadata</a></li></ul></div><div class="navGroup subNavGroup"><h4 class="navGroupSubcategoryTitle">Native query components</h4><ul><li class="navListItem"><a class="navItem" href="/docs/0.20.0/querying/filters.html">Filters</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/querying/granularities.html">Granularities</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/querying/dimensionspecs.html">Dimensions</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/querying/aggregations.html">Aggregations</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/querying/post-aggregations.html">Post-aggregations</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/misc/math-expr.html">Expressions</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/querying/having.html">Having filters (groupBy)</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/querying/limitspec.html">Sorting and limiting (groupBy)</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/querying/topnmetricspec.html">Sorting (topN)</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/querying/sorting-orders.html">String comparators</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/querying/virtual-columns.html">Virtual columns</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/geo.html">Spatial filters</a></li></ul></div></ul></div><div class="navGroup"><h3 class="navGroupCategoryTitle collapsible">Configuration<span class="arrow"><svg width="24" height="24" viewBox="0 0 24 24"><path fill="#565656" d="M7.41 15.41L12 10.83l4.59 4.58L18 14l-6-6-6 6z"></path><path d="M0 0h24v24H0z" fill="none"></path></svg></span></h3><ul class="hide"><li class="navListItem"><a class="navItem" href="/docs/0.20.0/configuration/index.html">Configuration reference</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions.html">Extensions</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/configuration/logging.html">Logging</a></li></ul></div><div class="navGroup"><h3 class="navGroupCategoryTitle collapsible">Operations<span class="arrow"><svg width="24" height="24" viewBox="0 0 24 24"><path fill="#565656" d="M7.41 15.41L12 10.83l4.59 4.58L18 14l-6-6-6 6z"></path><path d="M0 0h24v24H0z" fill="none"></path></svg></span></h3><ul class="hide"><li class="navListItem"><a class="navItem" href="/docs/0.20.0/operations/druid-console.html">Web console</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/operations/getting-started.html">Getting started with Apache Druid</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/operations/basic-cluster-tuning.html">Basic cluster tuning</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/operations/api-reference.html">API reference</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/operations/high-availability.html">High availability</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/operations/rolling-updates.html">Rolling updates</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/operations/rule-configuration.html">Retaining or automatically dropping data</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/operations/metrics.html">Metrics</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/operations/alerts.html">Alerts</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/operations/other-hadoop.html">Working with different versions of Apache Hadoop</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/operations/http-compression.html">HTTP compression</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/operations/tls-support.html">TLS support</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/operations/password-provider.html">Password providers</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/operations/dump-segment.html">dump-segment tool</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/operations/reset-cluster.html">reset-cluster tool</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/operations/insert-segment-to-db.html">insert-segment-to-db tool</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/operations/pull-deps.html">pull-deps tool</a></li><div class="navGroup subNavGroup"><h4 class="navGroupSubcategoryTitle">Misc</h4><ul><li class="navListItem"><a class="navItem" href="/docs/0.20.0/operations/management-uis.html">Legacy Management UIs</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/operations/deep-storage-migration.html">Deep storage migration</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/operations/export-metadata.html">Export Metadata Tool</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/operations/metadata-migration.html">Metadata Migration</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/operations/segment-optimization.html">Segment Size Optimization</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/operations/use_sbt_to_build_fat_jar.html">Content for build.sbt</a></li></ul></div></ul></div><div class="navGroup"><h3 class="navGroupCategoryTitle collapsible">Development<span class="arrow"><svg width="24" height="24" viewBox="0 0 24 24"><path fill="#565656" d="M7.41 15.41L12 10.83l4.59 4.58L18 14l-6-6-6 6z"></path><path d="M0 0h24v24H0z" fill="none"></path></svg></span></h3><ul class="hide"><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/overview.html">Developing on Druid</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/modules.html">Creating extensions</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/javascript.html">JavaScript functionality</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/build.html">Build from source</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/versioning.html">Versioning</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/experimental.html">Experimental features</a></li></ul></div><div class="navGroup"><h3 class="navGroupCategoryTitle collapsible">Misc<span class="arrow"><svg width="24" height="24" viewBox="0 0 24 24"><path fill="#565656" d="M7.41 15.41L12 10.83l4.59 4.58L18 14l-6-6-6 6z"></path><path d="M0 0h24v24H0z" fill="none"></path></svg></span></h3><ul class="hide"><li class="navListItem"><a class="navItem" href="/docs/0.20.0/misc/papers-and-talks.html">Papers</a></li></ul></div><div class="navGroup"><h3 class="navGroupCategoryTitle collapsible">Hidden<span class="arrow"><svg width="24" height="24" viewBox="0 0 24 24"><path fill="#565656" d="M7.41 15.41L12 10.83l4.59 4.58L18 14l-6-6-6 6z"></path><path d="M0 0h24v24H0z" fill="none"></path></svg></span></h3><ul class="hide"><li class="navListItem"><a class="navItem" href="/docs/0.20.0/comparisons/druid-vs-elasticsearch.html">Apache Druid vs Elasticsearch</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/comparisons/druid-vs-key-value.html">Apache Druid vs. Key/Value Stores (HBase/Cassandra/OpenTSDB)</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/comparisons/druid-vs-kudu.html">Apache Druid vs Kudu</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/comparisons/druid-vs-redshift.html">Apache Druid vs Redshift</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/comparisons/druid-vs-spark.html">Apache Druid vs Spark</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/comparisons/druid-vs-sql-on-hadoop.html">Apache Druid vs SQL-on-Hadoop</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/design/auth.html">Authentication and Authorization</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/design/broker.html">Broker</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/design/coordinator.html">Coordinator Process</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/design/historical.html">Historical Process</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/design/indexer.html">Indexer Process</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/design/indexing-service.html">Indexing Service</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/design/middlemanager.html">MiddleManager Process</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/design/overlord.html">Overlord Process</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/design/router.html">Router Process</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/design/peons.html">Peons</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-core/approximate-histograms.html">Approximate Histogram aggregators</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-core/avro.html">Apache Avro</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-core/azure.html">Microsoft Azure</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-core/bloom-filter.html">Bloom Filter</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-core/datasketches-extension.html">DataSketches extension</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-core/datasketches-hll.html">DataSketches HLL Sketch module</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-core/datasketches-quantiles.html">DataSketches Quantiles Sketch module</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-core/datasketches-theta.html">DataSketches Theta Sketch module</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-core/datasketches-tuple.html">DataSketches Tuple Sketch module</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-core/druid-basic-security.html">Basic Security</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-core/druid-kerberos.html">Kerberos</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-core/druid-lookups.html">Cached Lookup Module</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-core/druid-ranger-security.html">Apache Ranger Security</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-core/google.html">Google Cloud Storage</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-core/hdfs.html">HDFS</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-core/kafka-extraction-namespace.html">Apache Kafka Lookups</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-core/lookups-cached-global.html">Globally Cached Lookups</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-core/mysql.html">MySQL Metadata Store</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-core/orc.html">ORC Extension</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-core/druid-pac4j.html">Druid pac4j based Security extension</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-core/parquet.html">Apache Parquet Extension</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-core/postgresql.html">PostgreSQL Metadata Store</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-core/protobuf.html">Protobuf</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-core/s3.html">S3-compatible</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-core/simple-client-sslcontext.html">Simple SSLContext Provider Module</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-core/stats.html">Stats aggregator</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-core/test-stats.html">Test Stats Aggregators</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-contrib/ambari-metrics-emitter.html">Ambari Metrics Emitter</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-contrib/cassandra.html">Apache Cassandra</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-contrib/cloudfiles.html">Rackspace Cloud Files</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-contrib/distinctcount.html">DistinctCount Aggregator</a></li><li class="navListItem"><a class="navItem" 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+<p>Apache Druid supports query result caching at both the segment and whole-query result level. Cache data can be stored in the
+local JVM heap or in an external distributed key/value store. In all cases, the Druid cache is a query result cache.
+The only difference is whether the result is a <em>partial result</em> for a particular segment, or the result for an entire
+query. In both cases, the cache is invalidated as soon as any underlying data changes; it will never return a stale
+result.</p>
+<p>Segment-level caching allows the cache to be leveraged even when some of the underling segments are mutable and
+undergoing real-time ingestion. In this case, Druid will potentially cache query results for immutable historical
+segments, while re-computing results for the real-time segments on each query. Whole-query result level caching is not
+useful in this scenario, since it would be continuously invalidated.</p>
+<p>Segment-level caching does require Druid to merge the per-segment results on each query, even when they are served
+from the cache. For this reason, whole-query result level caching can be more efficient if invalidation due to real-time
+ingestion is not an issue.</p>
+<h2><a class="anchor" aria-hidden="true" id="using-and-populating-cache"></a><a href="#using-and-populating-cache" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Using and populating cache</h2>
+<p>All caches have a pair of parameters that control the behavior of how individual queries interact with the cache, a 'use' cache parameter, and a 'populate' cache parameter. These settings must be enabled at the service level via <a href="/docs/0.20.0/configuration/index.html">runtime properties</a> to utilize cache, but can be controlled on a per query basis by setting them on the <a href="/docs/0.20.0/querying/query-context.html">query context</a>. The 'use' parameter obviously controls if a query will utilize cached results. The 'populate' parameter controls if a query will update cached results. These are separate parameters to allow queries on uncommon data to utilize cached results without polluting the cache with results that are unlikely to be re-used by other queries, for example large reports or very old data.</p>
+<h2><a class="anchor" aria-hidden="true" id="query-caching-on-brokers"></a><a href="#query-caching-on-brokers" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Query caching on Brokers</h2>
+<p>Brokers support both segment-level and whole-query result level caching. Segment-level caching is controlled by the
+parameters <code>useCache</code> and <code>populateCache</code>. Whole-query result level caching is controlled by the parameters
+<code>useResultLevelCache</code> and <code>populateResultLevelCache</code> and <a href="/docs/0.20.0/configuration/index.html">runtime properties</a>
+<code>druid.broker.cache.*</code>.</p>
+<p>Enabling segment-level caching on the Broker can yield faster results than if query caches were enabled on Historicals for small
+clusters. This is the recommended setup for smaller production clusters (&lt; 5 servers). Populating segment-level caches on
+the Broker is <em>not</em> recommended for large production clusters, since when the property <code>druid.broker.cache.populateCache</code> is
+set to <code>true</code> (and query context parameter <code>populateCache</code> is <em>not</em> set to <code>false</code>), results from Historicals are returned
+on a per segment basis, and Historicals will not be able to do any local result merging. This impairs the ability of the
+Druid cluster to scale well.</p>
+<h2><a class="anchor" aria-hidden="true" id="query-caching-on-historicals"></a><a href="#query-caching-on-historicals" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Query caching on Historicals</h2>
+<p>Historicals only support segment-level caching. Segment-level caching is controlled by the query context
+parameters <code>useCache</code> and <code>populateCache</code> and <a href="/docs/0.20.0/configuration/index.html">runtime properties</a>
+<code>druid.historical.cache.*</code>.</p>
+<p>Larger production clusters should enable segment-level cache population on Historicals only (not on Brokers) to avoid
+having to use Brokers to merge all query results. Enabling cache population on the Historicals instead of the Brokers
+enables the Historicals to do their own local result merging and puts less strain on the Brokers.</p>
+<h2><a class="anchor" aria-hidden="true" id="query-caching-on-ingestion-tasks"></a><a href="#query-caching-on-ingestion-tasks" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Query caching on Ingestion Tasks</h2>
+<p>Task executor processes such as the Peon or the experimental Indexer only support segment-level caching. Segment-level
+caching is controlled by the query context parameters <code>useCache</code> and <code>populateCache</code>
+and <a href="../configuration/index.html">runtime properties</a> <code>druid.realtime.cache.*</code>.</p>
+<p>Larger production clusters should enable segment-level cache population on task execution processes only
+(not on Brokers) to avoid having to use Brokers to merge all query results. Enabling cache population on the
+task execution processes instead of the Brokers enables the task execution processes to do their own local
+result merging and puts less strain on the Brokers.</p>
+<p>Note that the task executor processes only support caches that keep their data locally, such as the <code>caffeine</code> cache.
+This restriction exists because the cache stores results at the level of intermediate partial segments generated by the
+ingestion tasks. These intermediate partial segments will not necessarily be identical across task replicas, so
+remote cache types such as <code>memcached</code> will be ignored by task executor processes.</p>
+</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/0.20.0/querying/multitenancy.html"><span class="arrow-prev">← </span><span>Multitenancy</span></a><a class="docs-next button" href="/docs/0.20.0/querying/query-context.html"><span>Context parameters</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#using-and-populating-cache">Using and populating cache</a></li><li><a href="#query-caching-on-brokers">Query caching on Brokers</a></li><li><a href="#query-caching-on-historicals">Query caching on Historicals</a></li><li><a href="#query-caching-on-ingestion-tasks">Query caching on Ingestion Tasks</a></li></ul></nav></div><footer class="nav-footer druid-footer" id="footer"><div class="container"><div class="text-center"><p><a href="/technology">Technology</a> · <a href="/use-cases">Use Cases</a> · <a href="/druid-powered">Powered by Druid</a> · <a href="/docs/0.20.0/latest">Docs</a> · <a href="/community/">Community</a> · <a href="/downloads.html">Download</a> · <a href="/faq">FAQ</a></p></div><div class="text-center"><a title="Join the user group" href="https://groups.google.com/forum/#!forum/druid-user" target="_blank"><span class="fa fa-comments"></span></a> · <a title="Follow Druid" href="https://twitter.com/druidio" target="_blank"><span class="fab fa-twitter"></span></a> · <a title="Download via Apache" href="https://www.apache.org/dyn/closer.cgi?path=/incubator/druid/{{ site.druid_versions[0].versions[0].version }}/apache-druid-{{ site.druid_versions[0].versions[0].version }}-bin.tar.gz" target="_blank"><span class="fas fa-feather"></span></a> · <a title="GitHub" href="https://github.com/apache/druid" target="_blank"><span class="fab fa-github"></span></a></div><div class="text-center license">Copyright © 2019 <a href="https://www.apache.org/" target="_blank">Apache Software Foundation</a>.<br/>Except where otherwise noted, licensed under <a rel="license" href="http://creativecommons.org/licenses/by-sa/4.0/">CC BY-SA 4.0</a>.<br/>Apache Druid, Druid, and the Druid logo are either registered trademarks or trademarks of The Apache Software Foundation in the United States and other countries.</div></div></footer></div><script type="text/javascript" src="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.js"></script><script>
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+<p>Datasources in Apache Druid are things that you can query. The most common kind of datasource is a table datasource,
+and in many contexts the word &quot;datasource&quot; implicitly refers to table datasources. This is especially true
+<a href="../ingestion/index.html">during data ingestion</a>, where ingestion is always creating or writing into a table
+datasource. But at query time, there are many other types of datasources available.</p>
+<p>The word &quot;datasource&quot; is generally spelled <code>dataSource</code> (with a capital S) when it appears in API requests and
+responses.</p>
+<h2><a class="anchor" aria-hidden="true" id="datasource-type"></a><a href="#datasource-type" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Datasource type</h2>
+<h3><a class="anchor" aria-hidden="true" id="table"></a><a href="#table" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a><code>table</code></h3>
+<div class="tabs"><div class="nav-tabs"><div id="tab-group-1-tab-2" class="nav-link active" data-group="group_1" data-tab="tab-group-1-content-2">SQL</div><div id="tab-group-1-tab-3" class="nav-link" data-group="group_1" data-tab="tab-group-1-content-3">Native</div></div><div class="tab-content"><div id="tab-group-1-content-2" class="tab-pane active" data-group="group_1" tabindex="-1"><div><span><pre><code class="hljs css language-sql"><span class="hljs-keyword">SELECT</span> column1, column2 <span class="hljs-keyword">FROM</span> <span class="hljs-string">"druid"</span>.<span class="hljs-string">"dataSourceName"</span><br /></code></pre>
+</span></div></div><div id="tab-group-1-content-3" class="tab-pane" data-group="group_1" tabindex="-1"><div><span><pre><code class="hljs css language-json">{<br />  <span class="hljs-attr">"queryType"</span>: <span class="hljs-string">"scan"</span>,<br />  <span class="hljs-attr">"dataSource"</span>: <span class="hljs-string">"dataSourceName"</span>,<br />  <span class="hljs-attr">"columns"</span>: [<span class="hljs-string">"column1"</span>, <span class="hljs-string">"column2"</span>],<br />  <span class="hljs-attr">"intervals"</span>: [<span class="hljs-string">"0000/3000"</span>]<br />}<br /></code></pre>
+</span></div></div></div></div>
+<p>The table datasource is the most common type. This is the kind of datasource you get when you perform
+<a href="../ingestion/index.html">data ingestion</a>. They are split up into segments, distributed around the cluster,
+and queried in parallel.</p>
+<p>In <a href="sql.html#from">Druid SQL</a>, table datasources reside in the the <code>druid</code> schema. This is the default schema, so table
+datasources can be referenced as either <code>druid.dataSourceName</code> or simply <code>dataSourceName</code>.</p>
+<p>In native queries, table datasources can be referenced using their names as strings (as in the example above), or by
+using JSON objects of the form:</p>
+<pre><code class="hljs css language-json">"dataSource": {
+  "type": "table",
+  "name": "dataSourceName"
+}
+</code></pre>
+<p>To see a list of all table datasources, use the SQL query
+<code>SELECT * FROM INFORMATION_SCHEMA.TABLES WHERE TABLE_SCHEMA = 'druid'</code>.</p>
+<h3><a class="anchor" aria-hidden="true" id="lookup"></a><a href="#lookup" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a><code>lookup</code></h3>
+<div class="tabs"><div class="nav-tabs"><div id="tab-group-4-tab-5" class="nav-link active" data-group="group_4" data-tab="tab-group-4-content-5">SQL</div><div id="tab-group-4-tab-6" class="nav-link" data-group="group_4" data-tab="tab-group-4-content-6">Native</div></div><div class="tab-content"><div id="tab-group-4-content-5" class="tab-pane active" data-group="group_4" tabindex="-1"><div><span><pre><code class="hljs css language-sql"><span class="hljs-keyword">SELECT</span> k, v <span class="hljs-keyword">FROM</span> lookup.countries<br /></code></pre>
+</span></div></div><div id="tab-group-4-content-6" class="tab-pane" data-group="group_4" tabindex="-1"><div><span><pre><code class="hljs css language-json">{<br />  <span class="hljs-attr">"queryType"</span>: <span class="hljs-string">"scan"</span>,<br />  <span class="hljs-attr">"dataSource"</span>: {<br />    <span class="hljs-attr">"type"</span>: <span class="hljs-string">"lookup"</span>,<br />    <span class="hljs-attr">"lookup"</span>: <span class="hljs-string">"countries"</span><br />  },<br />  <span class="hljs-attr">"columns"</span>: [<span class="hljs-string">"k"</span>, <span class="hljs-string">"v"</span>],<br />  <span class="hljs-attr">"intervals"</span>: [<span class="hljs-string">"0000/3000"</span>]<br />}<br /></code></pre>
+</span></div></div></div></div>
+<p>Lookup datasources correspond to Druid's key-value <a href="lookups.html">lookup</a> objects. In <a href="sql.html#from">Druid SQL</a>,
+they reside in the the <code>lookup</code> schema. They are preloaded in memory on all servers, so they can be accessed rapidly.
+They can be joined onto regular tables using the <a href="#join">join operator</a>.</p>
+<p>Lookup datasources are key-value oriented and always have exactly two columns: <code>k</code> (the key) and <code>v</code> (the value), and
+both are always strings.</p>
+<p>To see a list of all lookup datasources, use the SQL query
+<code>SELECT * FROM INFORMATION_SCHEMA.TABLES WHERE TABLE_SCHEMA = 'lookup'</code>.</p>
+<blockquote>
+<p>Performance tip: Lookups can be joined with a base table either using an explicit <a href="#join">join</a>, or by using the
+SQL <a href="sql.html#string-functions"><code>LOOKUP</code> function</a>.
+However, the join operator must evaluate the condition on each row, whereas the
+<code>LOOKUP</code> function can defer evaluation until after an aggregation phase. This means that the <code>LOOKUP</code> function is
+usually faster than joining to a lookup datasource.</p>
+</blockquote>
+<p>Refer to the <a href="/docs/0.20.0/querying/query-execution.html#table">Query execution</a> page for more details on how queries are executed when you
+use table datasources.</p>
+<h3><a class="anchor" aria-hidden="true" id="union"></a><a href="#union" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a><code>union</code></h3>
+<div class="tabs"><div class="nav-tabs"><div id="tab-group-7-tab-8" class="nav-link active" data-group="group_7" data-tab="tab-group-7-content-8">Native</div></div><div class="tab-content"><div id="tab-group-7-content-8" class="tab-pane active" data-group="group_7" tabindex="-1"><div><span><pre><code class="hljs css language-json">{<br />  <span class="hljs-attr">"queryType"</span>: <span class="hljs-string">"scan"</span>,<br />  <span class="hljs-attr">"dataSource"</span>: {<br />    <span class="hljs-attr">"type"</span>: <span class="hljs-string">"union"</span>,<br />    <span class="hljs-attr">"dataSources"</span>: [<span class="hljs-string">"&lt;tableDataSourceName1&gt;"</span>, <span class="hljs-string">"&lt;tableDataSourceName2&gt;"</span>, <span class="hljs-string">"&lt;tableDataSourceName3&gt;"</span>]<br />  },<br />  <span class="hljs-attr">"columns"</span>: [<span class="hljs-string">"column1"</span>, <span class="hljs-string">"column2"</span>],<br />  <span class="hljs-attr">"intervals"</span>: [<span class="hljs-string">"0000/3000"</span>]<br />}<br /></code></pre>
+</span></div></div></div></div>
+<p>Union datasources allow you to treat two or more table datasources as a single datasource. The datasources being unioned
+do not need to have identical schemas. If they do not fully match up, then columns that exist in one table but not
+another will be treated as if they contained all null values in the tables where they do not exist.</p>
+<p>The list of &quot;dataSources&quot; must be nonempty. If you want to query an empty dataset, use an <a href="#inline"><code>inline</code> datasource</a>
+instead.</p>
+<p>Union datasources are not available in Druid SQL.</p>
+<p>Refer to the <a href="/docs/0.20.0/querying/query-execution.html#union">Query execution</a> page for more details on how queries are executed when you
+use union datasources.</p>
+<h3><a class="anchor" aria-hidden="true" id="inline"></a><a href="#inline" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a><code>inline</code></h3>
+<div class="tabs"><div class="nav-tabs"><div id="tab-group-9-tab-10" class="nav-link active" data-group="group_9" data-tab="tab-group-9-content-10">Native</div></div><div class="tab-content"><div id="tab-group-9-content-10" class="tab-pane active" data-group="group_9" tabindex="-1"><div><span><pre><code class="hljs css language-json">{<br />  <span class="hljs-attr">"queryType"</span>: <span class="hljs-string">"scan"</span>,<br />  <span class="hljs-attr">"dataSource"</span>: {<br />    <span class="hljs-attr">"type"</span>: <span class="hljs-string">"inline"</span>,<br />    <span class="hljs-attr">"columnNames"</span>: [<span class="hljs-string">"country"</span>, <span class="hljs-string">"city"</span>],<br />    <span class="hljs-attr">"rows"</span>: [<br />      [<span class="hljs-string">"United States"</span>, <span class="hljs-string">"San Francisco"</span>],<br />      [<span class="hljs-string">"Canada"</span>, <span class="hljs-string">"Calgary"</span>]<br />    ]<br />  },<br />  <span class="hljs-attr">"columns"</span>: [<span class="hljs-string">"country"</span>, <span class="hljs-string">"city"</span>],<br />  <span class="hljs-attr">"intervals"</span>: [<span class="hljs-string">"0000/3000"</span>]<br />}<br /></code></pre>
+</span></div></div></div></div>
+<p>Inline datasources allow you to query a small amount of data that is embedded in the query itself. They are useful when
+you want to write a query on a small amount of data without loading it first. They are also useful as inputs into a
+<a href="#join">join</a>. Druid also uses them internally to handle subqueries that need to be inlined on the Broker. See the
+<a href="#query"><code>query</code> datasource</a> documentation for more details.</p>
+<p>There are two fields in an inline datasource: an array of <code>columnNames</code> and an array of <code>rows</code>. Each row is an array
+that must be exactly as long as the list of <code>columnNames</code>. The first element in each row corresponds to the first
+column in <code>columnNames</code>, and so on.</p>
+<p>Inline datasources are not available in Druid SQL.</p>
+<p>Refer to the <a href="/docs/0.20.0/querying/query-execution.html#inline">Query execution</a> page for more details on how queries are executed when you
+use inline datasources.</p>
+<h3><a class="anchor" aria-hidden="true" id="query"></a><a href="#query" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a><code>query</code></h3>
+<div class="tabs"><div class="nav-tabs"><div id="tab-group-11-tab-12" class="nav-link active" data-group="group_11" data-tab="tab-group-11-content-12">SQL</div><div id="tab-group-11-tab-13" class="nav-link" data-group="group_11" data-tab="tab-group-11-content-13">Native</div></div><div class="tab-content"><div id="tab-group-11-content-12" class="tab-pane active" data-group="group_11" tabindex="-1"><div><span><pre><code class="hljs css language-sql"><span class="hljs-comment">-- Uses a subquery to count hits per page, then takes the average.</span><br /><span class="hljs-keyword">SELECT</span><br />  <span class="hljs-keyword">AVG</span>(cnt) <span class="hljs-keyword">AS</span> average_hits_per_page<br /><span class="hljs-keyword">FROM</span><br />  (<span class="hljs-keyword">SELECT</span> page, <span class="hljs-keyword">COUNT</span>(*) <span class="hljs-keyword">AS</span> hits <span class="hljs-keyword">FROM</span> site_traffic <span class="hljs-keyword">GROUP</span> <span class="hljs-keyword">BY</span> page)<br /></code></pre>
+</span></div></div><div id="tab-group-11-content-13" class="tab-pane" data-group="group_11" tabindex="-1"><div><span><pre><code class="hljs css language-json">{<br />  <span class="hljs-attr">"queryType"</span>: <span class="hljs-string">"timeseries"</span>,<br />  <span class="hljs-attr">"dataSource"</span>: {<br />    <span class="hljs-attr">"type"</span>: <span class="hljs-string">"query"</span>,<br />    <span class="hljs-attr">"query"</span>: {<br />      <span class="hljs-attr">"queryType"</span>: <span class="hljs-string">"groupBy"</span>,<br />      <span class="hljs-attr">"dataSource"</span>: <span class="hljs-string">"site_traffic"</span>,<br />      <span class="hljs-attr">"intervals"</span>: [<span class="hljs-string">"0000/3000"</span>],<br />      <span class="hljs-attr">"granularity"</span>: <span class="hljs-string">"all"</span>,<br />      <span class="hljs-attr">"dimensions"</span>: [<span class="hljs-string">"page"</span>],<br />      <span class="hljs-attr">"aggregations"</span>: [<br />        { <span class="hljs-attr">"type"</span>: <span class="hljs-string">"count"</span>, <span class="hljs-attr">"name"</span>: <span class="hljs-string">"hits"</span> }<br />      ]<br />    }<br />  },<br />  <span class="hljs-attr">"intervals"</span>: [<span class="hljs-string">"0000/3000"</span>],<br />  <span class="hljs-attr">"granularity"</span>: <span class="hljs-string">"all"</span>,<br />  <span class="hljs-attr">"aggregations"</span>: [<br />    { <span class="hljs-attr">"type"</span>: <span class="hljs-string">"longSum"</span>, <span class="hljs-attr">"name"</span>: <span class="hljs-string">"hits"</span>, <span class="hljs-attr">"fieldName"</span>: <span class="hljs-string">"hits"</span> },<br />    { <span class="hljs-attr">"type"</span>: <span class="hljs-string">"count"</span>, <span class="hljs-attr">"name"</span>: <span class="hljs-string">"pages"</span> }<br />  ],<br />  <span class="hljs-attr">"postAggregations"</span>: [<br />    { <span class="hljs-attr">"type"</span>: <span class="hljs-string">"expression"</span>, <span class="hljs-attr">"name"</span>: <span class="hljs-string">"average_hits_per_page"</span>, <span class="hljs-attr">"expression"</span>: <span class="hljs-string">"hits / pages"</span> }<br />  ]<br />}<br /></code></pre>
+</span></div></div></div></div>
+<p>Query datasources allow you to issue subqueries. In native queries, they can appear anywhere that accepts a
+<code>dataSource</code>. In SQL, they can appear in the following places, always surrounded by parentheses:</p>
+<ul>
+<li>The FROM clause: <code>FROM (&lt;subquery&gt;)</code>.</li>
+<li>As inputs to a JOIN: <code>&lt;table-or-subquery-1&gt; t1 INNER JOIN &lt;table-or-subquery-2&gt; t2 ON t1.&lt;col1&gt; = t2.&lt;col2&gt;</code>.</li>
+<li>In the WHERE clause: <code>WHERE &lt;column&gt; { IN | NOT IN } (&lt;subquery&gt;)</code>. These are translated to joins by the SQL planner.</li>
+</ul>
+<blockquote>
+<p>Performance tip: In most cases, subquery results are fully buffered in memory on the Broker and then further
+processing occurs on the Broker itself. This means that subqueries with large result sets can cause performance
+bottlenecks or run into memory usage limits on the Broker. See the <a href="/docs/0.20.0/querying/query-execution.html#query">Query execution</a>
+page for more details on how subqueries are executed and what limits will apply.</p>
+</blockquote>
+<h3><a class="anchor" aria-hidden="true" id="join"></a><a href="#join" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a><code>join</code></h3>
+<div class="tabs"><div class="nav-tabs"><div id="tab-group-14-tab-15" class="nav-link active" data-group="group_14" data-tab="tab-group-14-content-15">SQL</div><div id="tab-group-14-tab-16" class="nav-link" data-group="group_14" data-tab="tab-group-14-content-16">Native</div></div><div class="tab-content"><div id="tab-group-14-content-15" class="tab-pane active" data-group="group_14" tabindex="-1"><div><span><pre><code class="hljs css language-sql"><span class="hljs-comment">-- Joins "sales" with "countries" (using "store" as the join key) to get sales by country.</span><br /><span class="hljs-keyword">SELECT</span><br />  store_to_country.v <span class="hljs-keyword">AS</span> country,<br />  <span class="hljs-keyword">SUM</span>(sales.revenue) <span class="hljs-keyword">AS</span> country_revenue<br /><span class="hljs-keyword">FROM</span><br />  sales<br />  <span class="hljs-keyword">INNER</span> <span class="hljs-keyword">JOIN</span> lookup.store_to_country <span class="hljs-keyword">ON</span> sales.store = store_to_country.k<br /><span class="hljs-keyword">GROUP</span> <span class="hljs-keyword">BY</span><br />  countries.v<br /></code></pre>
+</span></div></div><div id="tab-group-14-content-16" class="tab-pane" data-group="group_14" tabindex="-1"><div><span><pre><code class="hljs css language-json">{<br />  <span class="hljs-attr">"queryType"</span>: <span class="hljs-string">"groupBy"</span>,<br />  <span class="hljs-attr">"dataSource"</span>: {<br />    <span class="hljs-attr">"type"</span>: <span class="hljs-string">"join"</span>,<br />    <span class="hljs-attr">"left"</span>: <span class="hljs-string">"sales"</span>,<br />    <span class="hljs-attr">"right"</span>: {<br />      <span class="hljs-attr">"type"</span>: <span class="hljs-string">"lookup"</span>,<br />      <span class="hljs-attr">"lookup"</span>: <span class="hljs-string">"store_to_country"</span><br />    },<br />    <span class="hljs-attr">"rightPrefix"</span>: <span class="hljs-string">"r."</span>,<br />    <span class="hljs-attr">"condition"</span>: <span class="hljs-string">"store == \"r.k\""</span>,<br />    <span class="hljs-attr">"joinType"</span>: <span class="hljs-string">"INNER"</span><br />  },<br />  <span class="hljs-attr">"intervals"</span>: [<span class="hljs-string">"0000/3000"</span>],<br />  <span class="hljs-attr">"granularity"</span>: <span class="hljs-string">"all"</span>,<br />  <span class="hljs-attr">"dimensions"</span>: [<br />    { <span class="hljs-attr">"type"</span>: <span class="hljs-string">"default"</span>, <span class="hljs-attr">"outputName"</span>: <span class="hljs-string">"country"</span>, <span class="hljs-attr">"dimension"</span>: <span class="hljs-string">"r.v"</span> }<br />  ],<br />  <span class="hljs-attr">"aggregations"</span>: [<br />    { <span class="hljs-attr">"type"</span>: <span class="hljs-string">"longSum"</span>, <span class="hljs-attr">"name"</span>: <span class="hljs-string">"country_revenue"</span>, <span class="hljs-attr">"fieldName"</span>: <span class="hljs-string">"revenue"</span> }<br />  ]<br />}<br /></code></pre>
+</span></div></div></div></div>
+<p>Join datasources allow you to do a SQL-style join of two datasources. Stacking joins on top of each other allows
+you to join arbitrarily many datasources.</p>
+<p>In Druid 0.20.0, joins are implemented with a broadcast hash-join algorithm. This means that all tables
+other than the leftmost &quot;base&quot; table must fit in memory. It also means that the join condition must be an equality. This
+feature is intended mainly to allow joining regular Druid tables with <a href="#lookup">lookup</a>, <a href="#inline">inline</a>, and
+<a href="#query">query</a> datasources.</p>
+<p>Refer to the <a href="/docs/0.20.0/querying/query-execution.html#join">Query execution</a> page for more details on how queries are executed when you
+use join datasources.</p>
+<h4><a class="anchor" aria-hidden="true" id="joins-in-sql"></a><a href="#joins-in-sql" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Joins in SQL</h4>
+<p>SQL joins take the form:</p>
+<pre><code class="hljs">&lt;o1&gt; [ <span class="hljs-keyword">INNER</span> | LEFT [<span class="hljs-keyword">OUTER</span>] ] <span class="hljs-keyword">JOIN</span> &lt;o2&gt; <span class="hljs-keyword">ON</span> &lt;condition&gt;
+</code></pre>
+<p>The condition must involve only equalities, but functions are okay, and there can be multiple equalities ANDed together.
+Conditions like <code>t1.x = t2.x</code>, or <code>LOWER(t1.x) = t2.x</code>, or <code>t1.x = t2.x AND t1.y = t2.y</code> can all be handled. Conditions
+like <code>t1.x &lt;&gt; t2.x</code> cannot currently be handled.</p>
+<p>Note that Druid SQL is less rigid than what native join datasources can handle. In cases where a SQL query does
+something that is not allowed as-is with a native join datasource, Druid SQL will generate a subquery. This can have
+a substantial effect on performance and scalability, so it is something to watch out for. Some examples of when the
+SQL layer will generate subqueries include:</p>
+<ul>
+<li><p>Joining a regular Druid table to itself, or to another regular Druid table. The native join datasource can accept
+a table on the left-hand side, but not the right, so a subquery is needed.</p></li>
+<li><p>Join conditions where the expressions on either side are of different types.</p></li>
+<li><p>Join conditions where the right-hand expression is not a direct column access.</p></li>
+</ul>
+<p>For more information about how Druid translates SQL to native queries, refer to the
+<a href="/docs/0.20.0/querying/sql.html#query-translation">Druid SQL</a> documentation.</p>
+<h4><a class="anchor" aria-hidden="true" id="joins-in-native-queries"></a><a href="#joins-in-native-queries" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Joins in native queries</h4>
+<p>Native join datasources have the following properties. All are required.</p>
+<table>
+<thead>
+<tr><th>Field</th><th>Description</th></tr>
+</thead>
+<tbody>
+<tr><td><code>left</code></td><td>Left-hand datasource. Must be of type <code>table</code>, <code>join</code>, <code>lookup</code>, <code>query</code>, or <code>inline</code>. Placing another join as the left datasource allows you to join arbitrarily many datasources.</td></tr>
+<tr><td><code>right</code></td><td>Right-hand datasource. Must be of type <code>lookup</code>, <code>query</code>, or <code>inline</code>. Note that this is more rigid than what Druid SQL requires.</td></tr>
+<tr><td><code>rightPrefix</code></td><td>String prefix that will be applied to all columns from the right-hand datasource, to prevent them from colliding with columns from the left-hand datasource. Can be any string, so long as it is nonempty and is not be a prefix of the string <code>__time</code>. Any columns from the left-hand side that start with your <code>rightPrefix</code> will be shadowed. It is up to you to provide a prefix that will not shadow any important columns from the left side.</td></tr>
+<tr><td><code>condition</code></td><td><a href="/docs/0.20.0/misc/math-expr.html">Expression</a> that must be an equality where one side is an expression of the left-hand side, and the other side is a simple column reference to the right-hand side. Note that this is more rigid than what Druid SQL requires: here, the right-hand reference must be a simple column reference; in SQL it can be an expression.</td></tr>
+<tr><td><code>joinType</code></td><td><code>INNER</code> or <code>LEFT</code>.</td></tr>
+</tbody>
+</table>
+<h4><a class="anchor" aria-hidden="true" id="join-performance"></a><a href="#join-performance" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Join performance</h4>
+<p>Joins are a feature that can significantly affect performance of your queries. Some performance tips and notes:</p>
+<ol>
+<li>Joins are especially useful with <a href="#lookup">lookup datasources</a>, but in most cases, the
+<a href="sql.html#string-functions"><code>LOOKUP</code> function</a> performs better than a join. Consider using the <code>LOOKUP</code> function if
+it is appropriate for your use case.</li>
+<li>When using joins in Druid SQL, keep in mind that it can generate subqueries that you did not explicitly include in
+your queries. Refer to the <a href="/docs/0.20.0/querying/sql.html#query-translation">Druid SQL</a> documentation for more details about when this happens
+and how to detect it.</li>
+<li>One common reason for implicit subquery generation is if the types of the two halves of an equality do not match.
+For example, since lookup keys are always strings, the condition <code>druid.d JOIN lookup.l ON d.field = l.field</code> will
+perform best if <code>d.field</code> is a string.</li>
+<li>As of Druid 0.20.0, the join operator must evaluate the condition for each row. In the future, we expect
+to implement both early and deferred condition evaluation, which we expect to improve performance considerably for
+common use cases.</li>
+<li>Currently, Druid does not support pushing down predicates (condition and filter) past a Join (i.e. into
+Join's children). Druid only supports pushing predicates into the join if they originated from
+above the join. Hence, the location of predicates and filters in your Druid SQL is very important.
+Also, as a result of this, comma joins should be avoided.</li>
+</ol>
+<h4><a class="anchor" aria-hidden="true" id="future-work-for-joins"></a><a href="#future-work-for-joins" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Future work for joins</h4>
+<p>Joins are an area of active development in Druid. The following features are missing today but may appear in
+future versions:</p>
+<ul>
+<li>Reordering of predicates and filters (pushing up and/or pushing down) to get the most performant plan.</li>
+<li>Preloaded dimension tables that are wider than lookups (i.e. supporting more than a single key and single value).</li>
+<li>RIGHT OUTER and FULL OUTER joins. Currently, they are partially implemented. Queries will run but results will not
+always be correct.</li>
+<li>Performance-related optimizations as mentioned in the <a href="#join-performance">previous section</a>.</li>
+<li>Join algorithms other than broadcast hash-joins.</li>
+<li>Join condition on a column compared to a constant value.</li>
+<li>Join conditions on a column containing a multi-value dimension.</li>
+</ul>
+</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/0.20.0/querying/query-execution.html"><span class="arrow-prev">← </span><span>Query execution</span></a><a class="docs-next button" href="/docs/0.20.0/querying/joins.html"><span>Joins</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#datasource-type">Datasource type</a><ul class="toc-headings"><li><a href="#table"><code>table</code></a></li><li><a href="#lookup"><code>lookup</code></a></li><li><a href="#union"><code>union</code></a></li><li><a href="#inline"><code>inline</code></a></li><li><a href="#query"><code>query</code></a></li><li><a href="#join"><code>join</code></a></li></ul></li></ul></nav></div><footer class="nav-footer druid-footer" id="footer"><div class="container"><div class="text-center"><p><a href="/technology">Technology</a> · <a href="/use-cases">Use Cases</a> · <a href="/druid-powered">Powered by Druid</a> · <a href="/docs/0.20.0/latest">Docs</a> · <a href="/community/">Community</a> · <a href="/downloads.html">Download</a> · <a href="/faq">FAQ</a></p></div><div class="text-center"><a title="Join the user group" href="https://groups.google.com/forum/#!forum/druid-user" target="_blank"><span class="fa fa-comments"></span></a> · <a title="Follow Druid" href="https://twitter.com/druidio" target="_blank"><span class="fab fa-twitter"></span></a> · <a title="Download via Apache" href="https://www.apache.org/dyn/closer.cgi?path=/incubator/druid/{{ site.druid_versions[0].versions[0].version }}/apache-druid-{{ site.druid_versions[0].versions[0].version }}-bin.tar.gz" target="_blank"><span class="fas fa-feather"></span></a> · <a title="GitHub" href="https://github.com/apache/druid" target="_blank"><span class="fab fa-github"></span></a></div><div class="text-center license">Copyright © 2019 <a href="https://www.apache.org/" target="_blank">Apache Software Foundation</a>.<br/>Except where otherwise noted, licensed under <a rel="license" href="http://creativecommons.org/licenses/by-sa/4.0/">CC BY-SA 4.0</a>.<br/>Apache Druid, Druid, and the Druid logo are either registered trademarks or trademarks of The Apache Software Foundation in the United States and other countries.</div></div></footer></div><script type="text/javascript" src="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.js"></script><script>
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+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>DatasourceMetadata queries · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/0.20.0/querying/datasourcemetadataquery.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.20.0" /><meta property="og:title" content="DatasourceMetadata queries · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
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+                    checkActiveCategory = false;
+                    break;
+                  }
+                }
+              }
+
+              coll[i].addEventListener('click', function() {
+                var arrow = this.childNodes[1];
+                arrow.classList.toggle('rotate');
+                var content = this.nextElementSibling;
+                content.classList.toggle('hide');
+              });
+            }
+
+            document.addEventListener('DOMContentLoaded', function() {
+              createToggler('#navToggler', '#docsNav', 'docsSliderActive');
+              createToggler('#tocToggler', 'body', 'tocActive');
+
+              var headings = document.querySelector('.toc-headings');
+              headings && headings.addEventListener('click', function(event) {
+                var el = event.target;
+                while(el !== headings){
+                  if (el.tagName === 'A') {
+                    document.body.classList.remove('tocActive');
+                    break;
+                  } else{
+                    el = el.parentNode;
+                  }
+                }
+              }, false);
+
+              function createToggler(togglerSelector, targetSelector, className) {
+                var toggler = document.querySelector(togglerSelector);
+                var target = document.querySelector(targetSelector);
+
+                if (!toggler) {
+                  return;
+                }
+
+                toggler.onclick = function(event) {
+                  event.preventDefault();
+
+                  target.classList.toggle(className);
+                };
+              }
+            });
+        </script></nav></div><div class="container mainContainer docsContainer"><div class="wrapper"><div class="post"><header class="postHeader"><a class="edit-page-link button" href="https://github.com/apache/druid/edit/master/docs/querying/datasourcemetadataquery.md" target="_blank" rel="noreferrer noopener">Edit</a><h1 id="__docusaurus" class="postHeaderTitle">DatasourceMetadata queries</h1></header><article><div><span><!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+  -->
+<blockquote>
+<p>Apache Druid supports two query languages: <a href="/docs/0.20.0/querying/sql.html">Druid SQL</a> and <a href="/docs/0.20.0/querying/querying.html">native queries</a>.
+This document describes a query
+type that is only available in the native language.</p>
+</blockquote>
+<p>Data Source Metadata queries return metadata information for a dataSource.  These queries return information about:</p>
+<ul>
+<li>The timestamp of latest ingested event for the dataSource. This is the ingested event without any consideration of rollup.</li>
+</ul>
+<p>The grammar for these queries is:</p>
+<pre><code class="hljs css language-json">{
+    <span class="hljs-attr">"queryType"</span> : <span class="hljs-string">"dataSourceMetadata"</span>,
+    <span class="hljs-attr">"dataSource"</span>: <span class="hljs-string">"sample_datasource"</span>
+}
+</code></pre>
+<p>There are 2 main parts to a Data Source Metadata query:</p>
+<table>
+<thead>
+<tr><th>property</th><th>description</th><th>required?</th></tr>
+</thead>
+<tbody>
+<tr><td>queryType</td><td>This String should always be &quot;dataSourceMetadata&quot;; this is the first thing Apache Druid looks at to figure out how to interpret the query</td><td>yes</td></tr>
+<tr><td>dataSource</td><td>A String or Object defining the data source to query, very similar to a table in a relational database. See <a href="/docs/0.20.0/querying/datasource.html">DataSource</a> for more information.</td><td>yes</td></tr>
+<tr><td>context</td><td>See <a href="/docs/0.20.0/querying/query-context.html">Context</a></td><td>no</td></tr>
+</tbody>
+</table>
+<p>The format of the result is:</p>
+<pre><code class="hljs css language-json">[ {
+  <span class="hljs-attr">"timestamp"</span> : <span class="hljs-string">"2013-05-09T18:24:00.000Z"</span>,
+  <span class="hljs-attr">"result"</span> : {
+    <span class="hljs-attr">"maxIngestedEventTime"</span> : <span class="hljs-string">"2013-05-09T18:24:09.007Z"</span>
+  }
+} ]
+</code></pre>
+</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/0.20.0/querying/segmentmetadataquery.html"><span class="arrow-prev">← </span><span class="function-name-prevnext">SegmentMetadata</span></a><a class="docs-next button" href="/docs/0.20.0/querying/filters.html"><span>Filters</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"></nav></div><footer class="nav-footer druid-footer" id="footer"><div class="container"><div class="text-center"><p><a href="/technology">Technology</a> · <a href="/use-cases">Use Cases</a> · <a href="/druid-powered">Powered by Druid</a> · <a href="/docs/0.20.0/latest">Docs</a> · <a href="/community/">Community</a> · <a href="/downloads.html">Download</a> · <a href="/faq">FAQ</a></p></div><div class="text-center"><a title="Join the user group" href="https://groups.google.com/forum/#!forum/druid-user" target="_blank"><span class="fa fa-comments"></span></a> · <a title="Follow Druid" href="https://twitter.com/druidio" target="_blank"><span class="fab fa-twitter"></span></a> · <a title="Download via Apache" href="https://www.apache.org/dyn/closer.cgi?path=/incubator/druid/{{ site.druid_versions[0].versions[0].version }}/apache-druid-{{ site.druid_versions[0].versions[0].version }}-bin.tar.gz" target="_blank"><span class="fas fa-feather"></span></a> · <a title="GitHub" href="https://github.com/apache/druid" target="_blank"><span class="fab fa-github"></span></a></div><div class="text-center license">Copyright © 2019 <a href="https://www.apache.org/" target="_blank">Apache Software Foundation</a>.<br/>Except where otherwise noted, licensed under <a rel="license" href="http://creativecommons.org/licenses/by-sa/4.0/">CC BY-SA 4.0</a>.<br/>Apache Druid, Druid, and the Druid logo are either registered trademarks or trademarks of The Apache Software Foundation in the United States and other countries.</div></div></footer></div><script type="text/javascript" src="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.js"></script><script>
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diff --git a/docs/0.20.0/querying/dimensionspecs.html b/docs/0.20.0/querying/dimensionspecs.html
new file mode 100644
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--- /dev/null
+++ b/docs/0.20.0/querying/dimensionspecs.html
@@ -0,0 +1,474 @@
+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Query dimensions · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/0.20.0/querying/dimensionspecs.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.20.0" /><meta property="og:title" content="Query dimensions · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
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+<blockquote>
+<p>Apache Druid supports two query languages: <a href="/docs/0.20.0/querying/sql.html">Druid SQL</a> and <a href="/docs/0.20.0/querying/querying.html">native queries</a>.
+This document describes the native
+language. For information about functions available in SQL, refer to the
+<a href="/docs/0.20.0/querying/sql.html#scalar-functions">SQL documentation</a>.</p>
+</blockquote>
+<p>The following JSON fields can be used in a query to operate on dimension values.</p>
+<h2><a class="anchor" aria-hidden="true" id="dimensionspec"></a><a href="#dimensionspec" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>DimensionSpec</h2>
+<p><code>DimensionSpec</code>s define how dimension values get transformed prior to aggregation.</p>
+<h3><a class="anchor" aria-hidden="true" id="default-dimensionspec"></a><a href="#default-dimensionspec" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Default DimensionSpec</h3>
+<p>Returns dimension values as is and optionally renames the dimension.</p>
+<pre><code class="hljs css language-json">{
+  <span class="hljs-attr">"type"</span> : <span class="hljs-string">"default"</span>,
+  <span class="hljs-attr">"dimension"</span> : &lt;dimension&gt;,
+  <span class="hljs-attr">"outputName"</span>: &lt;output_name&gt;,
+  <span class="hljs-attr">"outputType"</span>: &lt;<span class="hljs-string">"STRING"</span>|<span class="hljs-string">"LONG"</span>|<span class="hljs-string">"FLOAT"</span>&gt;
+}
+</code></pre>
+<p>When specifying a DimensionSpec on a numeric column, the user should include the type of the column in the <code>outputType</code> field. If left unspecified, the <code>outputType</code> defaults to STRING.</p>
+<p>Please refer to the <a href="#output-types">Output Types</a> section for more details.</p>
+<h3><a class="anchor" aria-hidden="true" id="extraction-dimensionspec"></a><a href="#extraction-dimensionspec" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Extraction DimensionSpec</h3>
+<p>Returns dimension values transformed using the given <a href="#extraction-functions">extraction function</a>.</p>
+<pre><code class="hljs css language-json">{
+  <span class="hljs-attr">"type"</span> : <span class="hljs-string">"extraction"</span>,
+  <span class="hljs-attr">"dimension"</span> : &lt;dimension&gt;,
+  <span class="hljs-attr">"outputName"</span> :  &lt;output_name&gt;,
+  <span class="hljs-attr">"outputType"</span>: &lt;<span class="hljs-string">"STRING"</span>|<span class="hljs-string">"LONG"</span>|<span class="hljs-string">"FLOAT"</span>&gt;,
+  <span class="hljs-attr">"extractionFn"</span> : &lt;extraction_function&gt;
+}
+</code></pre>
+<p><code>outputType</code> may also be specified in an ExtractionDimensionSpec to apply type conversion to results before merging. If left unspecified, the <code>outputType</code> defaults to STRING.</p>
+<p>Please refer to the <a href="#output-types">Output Types</a> section for more details.</p>
+<h3><a class="anchor" aria-hidden="true" id="filtered-dimensionspecs"></a><a href="#filtered-dimensionspecs" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Filtered DimensionSpecs</h3>
+<p>These are only useful for multi-value dimensions. If you have a row in Apache Druid that has a multi-value dimension with values [&quot;v1&quot;, &quot;v2&quot;, &quot;v3&quot;] and you send a groupBy/topN query grouping by that dimension with <a href="filters.html">query filter</a> for value &quot;v1&quot;. In the response you will get 3 rows containing &quot;v1&quot;, &quot;v2&quot; and &quot;v3&quot;. This behavior might be unintuitive for some use cases.</p>
+<p>It happens because &quot;query filter&quot; is internally used on the bitmaps and only used to match the row to be included in the query result processing. With multi-value dimensions, &quot;query filter&quot; behaves like a contains check, which will match the row with dimension value [&quot;v1&quot;, &quot;v2&quot;, &quot;v3&quot;]. Please see the section on &quot;Multi-value columns&quot; in <a href="/docs/0.20.0/design/segments.html">segment</a> for more details.
+Then groupBy/topN processing pipeline &quot;explodes&quot; all multi-value dimensions resulting 3 rows for &quot;v1&quot;, &quot;v2&quot; and &quot;v3&quot; each.</p>
+<p>In addition to &quot;query filter&quot; which efficiently selects the rows to be processed, you can use the filtered dimension spec to filter for specific values within the values of a multi-value dimension. These dimensionSpecs take a delegate DimensionSpec and a filtering criteria. From the &quot;exploded&quot; rows, only rows matching the given filtering criteria are returned in the query result.</p>
+<p>The following filtered dimension spec acts as a whitelist or blacklist for values as per the &quot;isWhitelist&quot; attribute value.</p>
+<pre><code class="hljs css language-json">{ "type" : "listFiltered", "delegate" : &lt;dimensionSpec&gt;, "values": &lt;array of strings&gt;, "isWhitelist": &lt;optional attribute for true/false, default is true&gt; }
+</code></pre>
+<p>Following filtered dimension spec retains only the values matching regex. Note that <code>listFiltered</code> is faster than this and one should use that for whitelist or blacklist use case.</p>
+<pre><code class="hljs css language-json">{ <span class="hljs-attr">"type"</span> : <span class="hljs-string">"regexFiltered"</span>, <span class="hljs-attr">"delegate"</span> : &lt;dimensionSpec&gt;, <span class="hljs-attr">"pattern"</span>: &lt;java regex pattern&gt; }
+</code></pre>
+<p>Following filtered dimension spec retains only the values starting with the same prefix.</p>
+<pre><code class="hljs css language-json">{ <span class="hljs-attr">"type"</span> : <span class="hljs-string">"prefixFiltered"</span>, <span class="hljs-attr">"delegate"</span> : &lt;dimensionSpec&gt;, <span class="hljs-attr">"prefix"</span>: &lt;prefix string&gt; }
+</code></pre>
+<p>For more details and examples, see <a href="multi-value-dimensions.html">multi-value dimensions</a>.</p>
+<h3><a class="anchor" aria-hidden="true" id="lookup-dimensionspecs"></a><a href="#lookup-dimensionspecs" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Lookup DimensionSpecs</h3>
+<blockquote>
+<p>Lookups are an <a href="/docs/0.20.0/development/experimental.html">experimental</a> feature.</p>
+</blockquote>
+<p>Lookup DimensionSpecs can be used to define directly a lookup implementation as dimension spec.
+Generally speaking there is two different kind of lookups implementations.
+The first kind is passed at the query time like <code>map</code> implementation.</p>
+<pre><code class="hljs css language-json">{
+  <span class="hljs-attr">"type"</span>:<span class="hljs-string">"lookup"</span>,
+  <span class="hljs-attr">"dimension"</span>:<span class="hljs-string">"dimensionName"</span>,
+  <span class="hljs-attr">"outputName"</span>:<span class="hljs-string">"dimensionOutputName"</span>,
+  <span class="hljs-attr">"replaceMissingValueWith"</span>:<span class="hljs-string">"missing_value"</span>,
+  <span class="hljs-attr">"retainMissingValue"</span>:<span class="hljs-literal">false</span>,
+  <span class="hljs-attr">"lookup"</span>:{<span class="hljs-attr">"type"</span>: <span class="hljs-string">"map"</span>, <span class="hljs-attr">"map"</span>:{<span class="hljs-attr">"key"</span>:<span class="hljs-string">"value"</span>}, <span class="hljs-attr">"isOneToOne"</span>:<span class="hljs-literal">false</span>}
+}
+</code></pre>
+<p>A property of <code>retainMissingValue</code> and <code>replaceMissingValueWith</code> can be specified at query time to hint how to handle missing values. Setting <code>replaceMissingValueWith</code> to <code>&quot;&quot;</code> has the same effect as setting it to <code>null</code> or omitting the property.
+Setting <code>retainMissingValue</code> to true will use the dimension's original value if it is not found in the lookup.
+The default values are <code>replaceMissingValueWith = null</code> and <code>retainMissingValue = false</code> which causes missing values to be treated as missing.</p>
+<p>It is illegal to set <code>retainMissingValue = true</code> and also specify a <code>replaceMissingValueWith</code>.</p>
+<p>A property <code>optimize</code> can be supplied to allow optimization of lookup based extraction filter (by default <code>optimize = true</code>).</p>
+<p>The second kind where it is not possible to pass at query time due to their size, will be based on an external lookup table or resource that is already registered via configuration file or/and Coordinator.</p>
+<pre><code class="hljs css language-json">{
+  <span class="hljs-attr">"type"</span>:<span class="hljs-string">"lookup"</span>,
+  <span class="hljs-attr">"dimension"</span>:<span class="hljs-string">"dimensionName"</span>,
+  <span class="hljs-attr">"outputName"</span>:<span class="hljs-string">"dimensionOutputName"</span>,
+  <span class="hljs-attr">"name"</span>:<span class="hljs-string">"lookupName"</span>
+}
+</code></pre>
+<h2><a class="anchor" aria-hidden="true" id="output-types"></a><a href="#output-types" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Output Types</h2>
+<p>The dimension specs provide an option to specify the output type of a column's values. This is necessary as it is possible for a column with given name to have different value types in different segments; results will be converted to the type specified by <code>outputType</code> before merging.</p>
+<p>Note that not all use cases for DimensionSpec currently support <code>outputType</code>, the table below shows which use cases support this option:</p>
+<table>
+<thead>
+<tr><th>Query Type</th><th>Supported?</th></tr>
+</thead>
+<tbody>
+<tr><td>GroupBy (v1)</td><td>no</td></tr>
+<tr><td>GroupBy (v2)</td><td>yes</td></tr>
+<tr><td>TopN</td><td>yes</td></tr>
+<tr><td>Search</td><td>no</td></tr>
+<tr><td>Select</td><td>no</td></tr>
+<tr><td>Cardinality Aggregator</td><td>no</td></tr>
+</tbody>
+</table>
+<h2><a class="anchor" aria-hidden="true" id="extraction-functions"></a><a href="#extraction-functions" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Extraction Functions</h2>
+<p>Extraction functions define the transformation applied to each dimension value.</p>
+<p>Transformations can be applied to both regular (string) dimensions, as well
+as the special <code>__time</code> dimension, which represents the current time bucket
+according to the query <a href="/docs/0.20.0/querying/granularities.html">aggregation granularity</a>.</p>
+<p><strong>Note</strong>: for functions taking string values (such as regular expressions),
+<code>__time</code> dimension values will be formatted in <a href="https://en.wikipedia.org/wiki/ISO_8601">ISO-8601 format</a>
+before getting passed to the extraction function.</p>
+<h3><a class="anchor" aria-hidden="true" id="regular-expression-extraction-function"></a><a href="#regular-expression-extraction-function" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Regular Expression Extraction Function</h3>
+<p>Returns the first matching group for the given regular expression.
+If there is no match, it returns the dimension value as is.</p>
+<pre><code class="hljs css language-json">{
+  "type" : "regex",
+  "expr" : &lt;regular_expression&gt;,
+  "index" : &lt;group to extract, default 1&gt;
+  "replaceMissingValue" : true,
+  "replaceMissingValueWith" : "foobar"
+}
+</code></pre>
+<p>For example, using <code>&quot;expr&quot; : &quot;(\\w\\w\\w).*&quot;</code> will transform
+<code>'Monday'</code>, <code>'Tuesday'</code>, <code>'Wednesday'</code> into <code>'Mon'</code>, <code>'Tue'</code>, <code>'Wed'</code>.</p>
+<p>If &quot;index&quot; is set, it will control which group from the match to extract. Index zero extracts the string matching the
+entire pattern.</p>
+<p>If the <code>replaceMissingValue</code> property is true, the extraction function will transform dimension values that do not match the regex pattern to a user-specified String. Default value is <code>false</code>.</p>
+<p>The <code>replaceMissingValueWith</code> property sets the String that unmatched dimension values will be replaced with, if <code>replaceMissingValue</code> is true. If <code>replaceMissingValueWith</code> is not specified, unmatched dimension values will be replaced with nulls.</p>
+<p>For example, if <code>expr</code> is <code>&quot;(a\w+)&quot;</code> in the example JSON above, a regex that matches words starting with the letter <code>a</code>, the extraction function will convert a dimension value like <code>banana</code> to <code>foobar</code>.</p>
+<h3><a class="anchor" aria-hidden="true" id="partial-extraction-function"></a><a href="#partial-extraction-function" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Partial Extraction Function</h3>
+<p>Returns the dimension value unchanged if the regular expression matches, otherwise returns null.</p>
+<pre><code class="hljs css language-json">{ <span class="hljs-attr">"type"</span> : <span class="hljs-string">"partial"</span>, <span class="hljs-attr">"expr"</span> : &lt;regular_expression&gt; }
+</code></pre>
+<h3><a class="anchor" aria-hidden="true" id="search-query-extraction-function"></a><a href="#search-query-extraction-function" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Search query extraction function</h3>
+<p>Returns the dimension value unchanged if the given <a href="../querying/searchquery.html#searchqueryspec"><code>SearchQuerySpec</code></a>
+matches, otherwise returns null.</p>
+<pre><code class="hljs css language-json">{ <span class="hljs-attr">"type"</span> : <span class="hljs-string">"searchQuery"</span>, <span class="hljs-attr">"query"</span> : &lt;search_query_spec&gt; }
+</code></pre>
+<h3><a class="anchor" aria-hidden="true" id="substring-extraction-function"></a><a href="#substring-extraction-function" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Substring Extraction Function</h3>
+<p>Returns a substring of the dimension value starting from the supplied index and of the desired length. Both index
+and length are measured in the number of Unicode code units present in the string as if it were encoded in UTF-16.
+Note that some Unicode characters may be represented by two code units. This is the same behavior as the Java String
+class's &quot;substring&quot; method.</p>
+<p>If the desired length exceeds the length of the dimension value, the remainder of the string starting at index will
+be returned. If index is greater than the length of the dimension value, null will be returned.</p>
+<pre><code class="hljs css language-json">{ <span class="hljs-attr">"type"</span> : <span class="hljs-string">"substring"</span>, <span class="hljs-attr">"index"</span> : <span class="hljs-number">1</span>, <span class="hljs-attr">"length"</span> : <span class="hljs-number">4</span> }
+</code></pre>
+<p>The length may be omitted for substring to return the remainder of the dimension value starting from index,
+or null if index greater than the length of the dimension value.</p>
+<pre><code class="hljs css language-json">{ <span class="hljs-attr">"type"</span> : <span class="hljs-string">"substring"</span>, <span class="hljs-attr">"index"</span> : <span class="hljs-number">3</span> }
+</code></pre>
+<h3><a class="anchor" aria-hidden="true" id="strlen-extraction-function"></a><a href="#strlen-extraction-function" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Strlen Extraction Function</h3>
+<p>Returns the length of dimension values, as measured in the number of Unicode code units present in the string as if it
+were encoded in UTF-16. Note that some Unicode characters may be represented by two code units. This is the same
+behavior as the Java String class's &quot;length&quot; method.</p>
+<p>null strings are considered as having zero length.</p>
+<pre><code class="hljs css language-json">{ <span class="hljs-attr">"type"</span> : <span class="hljs-string">"strlen"</span> }
+</code></pre>
+<h3><a class="anchor" aria-hidden="true" id="time-format-extraction-function"></a><a href="#time-format-extraction-function" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Time Format Extraction Function</h3>
+<p>Returns the dimension value formatted according to the given format string, time zone, and locale.</p>
+<p>For <code>__time</code> dimension values, this formats the time value bucketed by the
+<a href="/docs/0.20.0/querying/granularities.html">aggregation granularity</a></p>
+<p>For a regular dimension, it assumes the string is formatted in
+<a href="https://en.wikipedia.org/wiki/ISO_8601">ISO-8601 date and time format</a>.</p>
+<ul>
+<li><code>format</code> : date time format for the resulting dimension value, in <a href="http://www.joda.org/joda-time/apidocs/org/joda/time/format/DateTimeFormat.html">Joda Time DateTimeFormat</a>, or null to use the default ISO8601 format.</li>
+<li><code>locale</code> : locale (language and country) to use, given as a <a href="http://www.oracle.com/technetwork/java/javase/java8locales-2095355.html#util-text">IETF BCP 47 language tag</a>, e.g. <code>en-US</code>, <code>en-GB</code>, <code>fr-FR</code>, <code>fr-CA</code>, etc.</li>
+<li><code>timeZone</code> : time zone to use in <a href="http://en.wikipedia.org/wiki/List_of_tz_database_time_zones">IANA tz database format</a>, e.g. <code>Europe/Berlin</code> (this can possibly be different than the aggregation time-zone)</li>
+<li><code>granularity</code> : <a href="granularities.html">granularity</a> to apply before formatting, or omit to not apply any granularity.</li>
+<li><code>asMillis</code> : boolean value, set to true to treat input strings as millis rather than ISO8601 strings. Additionally, if <code>format</code> is null or not specified, output will be in millis rather than ISO8601.</li>
+</ul>
+<pre><code class="hljs css language-json">{ "type" : "timeFormat",
+  "format" : &lt;output_format&gt; (optional),
+  "timeZone" : &lt;time_zone&gt; (optional, default UTC),
+  "locale" : &lt;locale&gt; (optional, default current locale),
+  "granularity" : &lt;granularity&gt; (optional, default none) },
+  "asMillis" : &lt;true or false&gt; (optional) }
+</code></pre>
+<p>For example, the following dimension spec returns the day of the week for Montréal in French:</p>
+<pre><code class="hljs css language-json">{
+  <span class="hljs-attr">"type"</span> : <span class="hljs-string">"extraction"</span>,
+  <span class="hljs-attr">"dimension"</span> : <span class="hljs-string">"__time"</span>,
+  <span class="hljs-attr">"outputName"</span> :  <span class="hljs-string">"dayOfWeek"</span>,
+  <span class="hljs-attr">"extractionFn"</span> : {
+    <span class="hljs-attr">"type"</span> : <span class="hljs-string">"timeFormat"</span>,
+    <span class="hljs-attr">"format"</span> : <span class="hljs-string">"EEEE"</span>,
+    <span class="hljs-attr">"timeZone"</span> : <span class="hljs-string">"America/Montreal"</span>,
+    <span class="hljs-attr">"locale"</span> : <span class="hljs-string">"fr"</span>
+  }
+}
+</code></pre>
+<h3><a class="anchor" aria-hidden="true" id="time-parsing-extraction-function"></a><a href="#time-parsing-extraction-function" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Time Parsing Extraction Function</h3>
+<p>Parses dimension values as timestamps using the given input format,
+and returns them formatted using the given output format.</p>
+<p>Note, if you are working with the <code>__time</code> dimension, you should consider using the
+<a href="#time-format-extraction-function">time extraction function instead</a> instead,
+which works on time value directly as opposed to string values.</p>
+<p>If &quot;joda&quot; is true, time formats are described in the <a href="http://www.joda.org/joda-time/apidocs/org/joda/time/format/DateTimeFormat.html">Joda DateTimeFormat documentation</a>.
+If &quot;joda&quot; is false (or unspecified) then formats are described in the <a href="http://icu-project.org/apiref/icu4j/com/ibm/icu/text/SimpleDateFormat.html">SimpleDateFormat documentation</a>.
+In general, we recommend setting &quot;joda&quot; to true since Joda format strings are more common in Druid APIs and since Joda handles certain edge cases (like weeks and weekyears near
+the start and end of calendar years) in a more ISO8601 compliant way.</p>
+<p>If a value cannot be parsed using the provided timeFormat, it will be returned as-is.</p>
+<pre><code class="hljs css language-json">{ "type" : "time",
+  "timeFormat" : &lt;input_format&gt;,
+  "resultFormat" : &lt;output_format&gt;,
+  "joda" : &lt;true, false&gt; }
+</code></pre>
+<h3><a class="anchor" aria-hidden="true" id="javascript-extraction-function"></a><a href="#javascript-extraction-function" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>JavaScript Extraction Function</h3>
+<p>Returns the dimension value, as transformed by the given JavaScript function.</p>
+<p>For regular dimensions, the input value is passed as a string.</p>
+<p>For the <code>__time</code> dimension, the input value is passed as a number
+representing the number of milliseconds since January 1, 1970 UTC.</p>
+<p>Example for a regular dimension</p>
+<pre><code class="hljs css language-json">{
+  <span class="hljs-attr">"type"</span> : <span class="hljs-string">"javascript"</span>,
+  <span class="hljs-attr">"function"</span> : <span class="hljs-string">"function(str) { return str.substr(0, 3); }"</span>
+}
+</code></pre>
+<pre><code class="hljs css language-json">{
+  <span class="hljs-attr">"type"</span> : <span class="hljs-string">"javascript"</span>,
+  <span class="hljs-attr">"function"</span> : <span class="hljs-string">"function(str) { return str + '!!!'; }"</span>,
+  <span class="hljs-attr">"injective"</span> : <span class="hljs-literal">true</span>
+}
+</code></pre>
+<p>A property of <code>injective</code> specifies if the JavaScript function preserves uniqueness. The default value is <code>false</code> meaning uniqueness is not preserved</p>
+<p>Example for the <code>__time</code> dimension:</p>
+<pre><code class="hljs css language-json">{
+  <span class="hljs-attr">"type"</span> : <span class="hljs-string">"javascript"</span>,
+  <span class="hljs-attr">"function"</span> : <span class="hljs-string">"function(t) { return 'Second ' + Math.floor((t % 60000) / 1000); }"</span>
+}
+</code></pre>
+<blockquote>
+<p>JavaScript-based functionality is disabled by default. Please refer to the Druid <a href="/docs/0.20.0/development/javascript.html">JavaScript programming guide</a> for guidelines about using Druid's JavaScript functionality, including instructions on how to enable it.</p>
+</blockquote>
+<h3><a class="anchor" aria-hidden="true" id="registered-lookup-extraction-function"></a><a href="#registered-lookup-extraction-function" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Registered lookup extraction function</h3>
+<p>Lookups are a concept in Druid where dimension values are (optionally) replaced with new values.
+For more documentation on using lookups, please see <a href="/docs/0.20.0/querying/lookups.html">Lookups</a>.
+The &quot;registeredLookup&quot; extraction function lets you refer to a lookup that has been registered in the cluster-wide
+configuration.</p>
+<p>An example:</p>
+<pre><code class="hljs css language-json">{
+  <span class="hljs-attr">"type"</span>:<span class="hljs-string">"registeredLookup"</span>,
+  <span class="hljs-attr">"lookup"</span>:<span class="hljs-string">"some_lookup_name"</span>,
+  <span class="hljs-attr">"retainMissingValue"</span>:<span class="hljs-literal">true</span>
+}
+</code></pre>
+<p>A property of <code>retainMissingValue</code> and <code>replaceMissingValueWith</code> can be specified at query time to hint how to handle
+missing values. Setting <code>replaceMissingValueWith</code> to <code>&quot;&quot;</code> has the same effect as setting it to <code>null</code> or omitting the
+property. Setting <code>retainMissingValue</code> to true will use the dimension's original value if it is not found in the lookup.
+The default values are <code>replaceMissingValueWith = null</code> and <code>retainMissingValue = false</code> which causes missing values to
+be treated as missing.</p>
+<p>It is illegal to set <code>retainMissingValue = true</code> and also specify a <code>replaceMissingValueWith</code>.</p>
+<p>A property of <code>injective</code> can override the lookup's own sense of whether or not it is
+<a href="lookups.html#query-execution">injective</a>. If left unspecified, Druid will use the registered cluster-wide lookup
+configuration.</p>
+<p>A property <code>optimize</code> can be supplied to allow optimization of lookup based extraction filter (by default <code>optimize = true</code>).
+The optimization layer will run on the Broker and it will rewrite the extraction filter as clause of selector filters.
+For instance the following filter</p>
+<pre><code class="hljs css language-json">{
+    <span class="hljs-attr">"filter"</span>: {
+        <span class="hljs-attr">"type"</span>: <span class="hljs-string">"selector"</span>,
+        <span class="hljs-attr">"dimension"</span>: <span class="hljs-string">"product"</span>,
+        <span class="hljs-attr">"value"</span>: <span class="hljs-string">"bar_1"</span>,
+        <span class="hljs-attr">"extractionFn"</span>: {
+            <span class="hljs-attr">"type"</span>: <span class="hljs-string">"registeredLookup"</span>,
+            <span class="hljs-attr">"optimize"</span>: <span class="hljs-literal">true</span>,
+            <span class="hljs-attr">"lookup"</span>: <span class="hljs-string">"some_lookup_name"</span>
+        }
+    }
+}
+</code></pre>
+<p>will be rewritten as the following simpler query, assuming a lookup that maps &quot;product_1&quot; and &quot;product_3&quot; to the value
+&quot;bar_1&quot;:</p>
+<pre><code class="hljs css language-json">{
+   <span class="hljs-attr">"filter"</span>:{
+      <span class="hljs-attr">"type"</span>:<span class="hljs-string">"or"</span>,
+      <span class="hljs-attr">"fields"</span>:[
+         {
+            <span class="hljs-attr">"filter"</span>:{
+               <span class="hljs-attr">"type"</span>:<span class="hljs-string">"selector"</span>,
+               <span class="hljs-attr">"dimension"</span>:<span class="hljs-string">"product"</span>,
+               <span class="hljs-attr">"value"</span>:<span class="hljs-string">"product_1"</span>
+            }
+         },
+         {
+            <span class="hljs-attr">"filter"</span>:{
+               <span class="hljs-attr">"type"</span>:<span class="hljs-string">"selector"</span>,
+               <span class="hljs-attr">"dimension"</span>:<span class="hljs-string">"product"</span>,
+               <span class="hljs-attr">"value"</span>:<span class="hljs-string">"product_3"</span>
+            }
+         }
+      ]
+   }
+}
+</code></pre>
+<p>A null dimension value can be mapped to a specific value by specifying the empty string as the key in your lookup file.
+This allows distinguishing between a null dimension and a lookup resulting in a null.
+For example, specifying <code>{&quot;&quot;:&quot;bar&quot;,&quot;bat&quot;:&quot;baz&quot;}</code> with dimension values <code>[null, &quot;foo&quot;, &quot;bat&quot;]</code> and replacing missing values with <code>&quot;oof&quot;</code> will yield results of <code>[&quot;bar&quot;, &quot;oof&quot;, &quot;baz&quot;]</code>.
+Omitting the empty string key will cause the missing value to take over. For example, specifying <code>{&quot;bat&quot;:&quot;baz&quot;}</code> with dimension values <code>[null, &quot;foo&quot;, &quot;bat&quot;]</code> and replacing missing values with <code>&quot;oof&quot;</code> will yield results of <code>[&quot;oof&quot;, &quot;oof&quot;, &quot;baz&quot;]</code>.</p>
+<h3><a class="anchor" aria-hidden="true" id="inline-lookup-extraction-function"></a><a href="#inline-lookup-extraction-function" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Inline lookup extraction function</h3>
+<p>Lookups are a concept in Druid where dimension values are (optionally) replaced with new values.
+For more documentation on using lookups, please see <a href="/docs/0.20.0/querying/lookups.html">Lookups</a>.
+The &quot;lookup&quot; extraction function lets you specify an inline lookup map without registering one in the cluster-wide
+configuration.</p>
+<p>Examples:</p>
+<pre><code class="hljs css language-json">{
+  <span class="hljs-attr">"type"</span>:<span class="hljs-string">"lookup"</span>,
+  <span class="hljs-attr">"lookup"</span>:{
+    <span class="hljs-attr">"type"</span>:<span class="hljs-string">"map"</span>,
+    <span class="hljs-attr">"map"</span>:{<span class="hljs-attr">"foo"</span>:<span class="hljs-string">"bar"</span>, <span class="hljs-attr">"baz"</span>:<span class="hljs-string">"bat"</span>}
+  },
+  <span class="hljs-attr">"retainMissingValue"</span>:<span class="hljs-literal">true</span>,
+  <span class="hljs-attr">"injective"</span>:<span class="hljs-literal">true</span>
+}
+</code></pre>
+<pre><code class="hljs css language-json">{
+  <span class="hljs-attr">"type"</span>:<span class="hljs-string">"lookup"</span>,
+  <span class="hljs-attr">"lookup"</span>:{
+    <span class="hljs-attr">"type"</span>:<span class="hljs-string">"map"</span>,
+    <span class="hljs-attr">"map"</span>:{<span class="hljs-attr">"foo"</span>:<span class="hljs-string">"bar"</span>, <span class="hljs-attr">"baz"</span>:<span class="hljs-string">"bat"</span>}
+  },
+  <span class="hljs-attr">"retainMissingValue"</span>:<span class="hljs-literal">false</span>,
+  <span class="hljs-attr">"injective"</span>:<span class="hljs-literal">false</span>,
+  <span class="hljs-attr">"replaceMissingValueWith"</span>:<span class="hljs-string">"MISSING"</span>
+}
+</code></pre>
+<p>The inline lookup should be of type <code>map</code>.</p>
+<p>The properties <code>retainMissingValue</code>, <code>replaceMissingValueWith</code>, <code>injective</code>, and <code>optimize</code> behave similarly to the
+<a href="#registered-lookup-extraction-function">registered lookup extraction function</a>.</p>
+<h3><a class="anchor" aria-hidden="true" id="cascade-extraction-function"></a><a href="#cascade-extraction-function" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Cascade Extraction Function</h3>
+<p>Provides chained execution of extraction functions.</p>
+<p>A property of <code>extractionFns</code> contains an array of any extraction functions, which is executed in the array index order.</p>
+<p>Example for chaining <a href="#regular-expression-extraction-function">regular expression extraction function</a>, <a href="#javascript-extraction-function">JavaScript extraction function</a>, and <a href="#substring-extraction-function">substring extraction function</a> is as followings.</p>
+<pre><code class="hljs css language-json">{
+  <span class="hljs-attr">"type"</span> : <span class="hljs-string">"cascade"</span>,
+  <span class="hljs-attr">"extractionFns"</span>: [
+    {
+      <span class="hljs-attr">"type"</span> : <span class="hljs-string">"regex"</span>,
+      <span class="hljs-attr">"expr"</span> : <span class="hljs-string">"/([^/]+)/"</span>,
+      <span class="hljs-attr">"replaceMissingValue"</span>: <span class="hljs-literal">false</span>,
+      <span class="hljs-attr">"replaceMissingValueWith"</span>: <span class="hljs-literal">null</span>
+    },
+    {
+      <span class="hljs-attr">"type"</span> : <span class="hljs-string">"javascript"</span>,
+      <span class="hljs-attr">"function"</span> : <span class="hljs-string">"function(str) { return \"the \".concat(str) }"</span>
+    },
+    {
+      <span class="hljs-attr">"type"</span> : <span class="hljs-string">"substring"</span>,
+      <span class="hljs-attr">"index"</span> : <span class="hljs-number">0</span>, <span class="hljs-attr">"length"</span> : <span class="hljs-number">7</span>
+    }
+  ]
+}
+</code></pre>
+<p>It will transform dimension values with specified extraction functions in the order named.
+For example, <code>'/druid/prod/historical'</code> is transformed to <code>'the dru'</code> as regular expression extraction function first transforms it to <code>'druid'</code> and then, JavaScript extraction function transforms it to <code>'the druid'</code>, and lastly, substring extraction function transforms it to <code>'the dru'</code>.</p>
+<h3><a class="anchor" aria-hidden="true" id="string-format-extraction-function"></a><a href="#string-format-extraction-function" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>String Format Extraction Function</h3>
+<p>Returns the dimension value formatted according to the given format string.</p>
+<pre><code class="hljs css language-json">{ <span class="hljs-attr">"type"</span> : <span class="hljs-string">"stringFormat"</span>, <span class="hljs-attr">"format"</span> : &lt;sprintf_expression&gt;, <span class="hljs-attr">"nullHandling"</span> : &lt;optional attribute for handling <span class="hljs-literal">null</span> value&gt; }
+</code></pre>
+<p>For example if you want to concat &quot;[&quot; and &quot;]&quot; before and after the actual dimension value, you need to specify &quot;[%s]&quot; as format string. &quot;nullHandling&quot; can be one of <code>nullString</code>, <code>emptyString</code> or <code>returnNull</code>. With &quot;[%s]&quot; format, each configuration will result <code>[null]</code>, <code>[]</code>, <code>null</code>. Default is <code>nullString</code>.</p>
+<h3><a class="anchor" aria-hidden="true" id="upper-and-lower-extraction-functions"></a><a href="#upper-and-lower-extraction-functions" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Upper and Lower extraction functions.</h3>
+<p>Returns the dimension values as all upper case or lower case.
+Optionally user can specify the language to use in order to perform upper or lower transformation</p>
+<pre><code class="hljs css language-json">{
+  <span class="hljs-attr">"type"</span> : <span class="hljs-string">"upper"</span>,
+  <span class="hljs-attr">"locale"</span>:<span class="hljs-string">"fr"</span>
+}
+</code></pre>
+<p>or without setting &quot;locale&quot; (in this case, the current value of the default locale for this instance of the Java Virtual Machine.)</p>
+<pre><code class="hljs css language-json">{
+  <span class="hljs-attr">"type"</span> : <span class="hljs-string">"lower"</span>
+}
+</code></pre>
+<h3><a class="anchor" aria-hidden="true" id="bucket-extraction-function"></a><a href="#bucket-extraction-function" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Bucket Extraction Function</h3>
+<p>Bucket extraction function is used to bucket numerical values in each range of the given size by converting them to the same base value. Non numeric values are converted to null.</p>
+<ul>
+<li><code>size</code> : the size of the buckets (optional, default 1)</li>
+<li><code>offset</code> : the offset for the buckets (optional, default 0)</li>
+</ul>
+<p>The following extraction function creates buckets of 5 starting from 2. In this case, values in the range of [2, 7) will be converted to 2, values in [7, 12) will be converted to 7, etc.</p>
+<pre><code class="hljs css language-json">{
+  <span class="hljs-attr">"type"</span> : <span class="hljs-string">"bucket"</span>,
+  <span class="hljs-attr">"size"</span> : <span class="hljs-number">5</span>,
+  <span class="hljs-attr">"offset"</span> : <span class="hljs-number">2</span>
+}
+</code></pre>
+</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/0.20.0/querying/granularities.html"><span class="arrow-prev">← </span><span>Granularities</span></a><a class="docs-next button" href="/docs/0.20.0/querying/aggregations.html"><span>Aggregations</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#dimensionspec">DimensionSpec</a><ul class="toc-headings"><li><a href="#default-dimensionspec">Default DimensionSpec</a></li><li><a href="#extraction-dimensionspec">Extraction DimensionSpec</a></li><li><a href="#filtered-dimensionspecs">Filtered DimensionSpecs</a></li><li><a href="#lookup-dimensionspecs">Lookup DimensionSpecs</a></li></ul></li><li><a href="#output-types">Output Types</a></li><li><a href="#extraction-functions">Extraction Functions</a><ul class="toc-headings"><li><a href="#regular-expression-extraction-function">Regular Expression Extraction Function</a></li><li><a href="#partial-extraction-function">Partial Extraction Function</a></li><li><a href="#search-query-extraction-function">Search query extraction function</a></li><li><a href="#substring-extraction-function">Substring Extraction Function</a></li><li><a href="#strlen-extraction-function">Strlen Extraction Function</a></li><li><a href="#time-format-extraction-function">Time Format Extraction Function</a></li><li><a href="#time-parsing-extraction-function">Time Parsing Extraction Function</a></li><li><a href="#javascript-extraction-function">JavaScript Extraction Function</a></li><li><a href="#registered-lookup-extraction-function">Registered lookup extraction function</a></li><li><a href="#inline-lookup-extraction-function">Inline lookup extraction function</a></li><li><a href="#cascade-extraction-function">Cascade Extraction Function</a></li><li><a href="#string-format-extraction-function">String Format Extraction Function</a></li><li><a href="#upper-and-lower-extraction-functions">Upper and Lower extraction functions.</a></li><li><a href="#bucket-extraction-function">Bucket Extraction Function</a></li></ul></li></ul></nav></div><footer class="nav-footer druid-footer" id="footer"><div class="container"><div class="text-center"><p><a href="/technology">Technology</a> · <a href="/use-cases">Use Cases</a> · <a href="/druid-powered">Powered by Druid</a> · <a href="/docs/0.20.0/latest">Docs</a> · <a href="/community/">Community</a> · <a href="/downloads.html">Download</a> · <a href="/faq">FAQ</a></p></div><div class="text-center"><a title="Join the user group" href="https://groups.google.com/forum/#!forum/druid-user" target="_blank"><span class="fa fa-comments"></span></a> · <a title="Follow Druid" href="https://twitter.com/druidio" target="_blank"><span class="fab fa-twitter"></span></a> · <a title="Download via Apache" href="https://www.apache.org/dyn/closer.cgi?path=/incubator/druid/{{ site.druid_versions[0].versions[0].version }}/apache-druid-{{ site.druid_versions[0].versions[0].version }}-bin.tar.gz" target="_blank"><span class="fas fa-feather"></span></a> · <a title="GitHub" href="https://github.com/apache/druid" target="_blank"><span class="fab fa-github"></span></a></div><div class="text-center license">Copyright © 2019 <a href="https://www.apache.org/" target="_blank">Apache Software Foundation</a>.<br/>Except where otherwise noted, licensed under <a rel="license" href="http://creativecommons.org/licenses/by-sa/4.0/">CC BY-SA 4.0</a>.<br/>Apache Druid, Druid, and the Druid logo are either registered trademarks or trademarks of The Apache Software Foundation in the United States and other countries.</div></div></footer></div><script type="text/javascript" src="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.js"></script><script>
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+  ~ Licensed to the Apache Software Foundation (ASF) under one
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+  -->
+<blockquote>
+<p>Apache Druid supports two query languages: <a href="/docs/0.20.0/querying/sql.html">Druid SQL</a> and <a href="/docs/0.20.0/querying/querying.html">native queries</a>.
+This document describes the native
+language. For information about aggregators available in SQL, refer to the
+<a href="/docs/0.20.0/querying/sql.html#scalar-functions">SQL documentation</a>.</p>
+</blockquote>
+<p>A filter is a JSON object indicating which rows of data should be included in the computation for a query. It’s essentially the equivalent of the WHERE clause in SQL. Apache Druid supports the following types of filters.</p>
+<p><strong>Note</strong></p>
+<p>Filters are commonly applied on dimensions, but can be applied on aggregated metrics, for example, see <a href="/docs/0.20.0/querying/aggregations.html#filtered-aggregator">filtered-aggregator</a> and <a href="/docs/0.20.0/querying/having.html">having-filters</a>.</p>
+<h3><a class="anchor" aria-hidden="true" id="selector-filter"></a><a href="#selector-filter" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Selector filter</h3>
+<p>The simplest filter is a selector filter. The selector filter will match a specific dimension with a specific value. Selector filters can be used as the base filters for more complex Boolean expressions of filters.</p>
+<p>The grammar for a SELECTOR filter is as follows:</p>
+<pre><code class="hljs css language-json">"filter": { "type": "selector", "dimension": &lt;dimension_string&gt;, "value": &lt;dimension_value_string&gt; }
+</code></pre>
+<p>This is the equivalent of <code>WHERE &lt;dimension_string&gt; = '&lt;dimension_value_string&gt;'</code>.</p>
+<p>The selector filter supports the use of extraction functions, see <a href="#filtering-with-extraction-functions">Filtering with Extraction Functions</a> for details.</p>
+<h3><a class="anchor" aria-hidden="true" id="column-comparison-filter"></a><a href="#column-comparison-filter" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Column Comparison filter</h3>
+<p>The column comparison filter is similar to the selector filter, but instead compares dimensions to each other. For example:</p>
+<pre><code class="hljs css language-json">"filter": { "type": "columnComparison", "dimensions": [&lt;dimension_a&gt;, &lt;dimension_b&gt;] }
+</code></pre>
+<p>This is the equivalent of <code>WHERE &lt;dimension_a&gt; = &lt;dimension_b&gt;</code>.</p>
+<p><code>dimensions</code> is list of <a href="/docs/0.20.0/querying/dimensionspecs.html">DimensionSpecs</a>, making it possible to apply an extraction function if needed.</p>
+<h3><a class="anchor" aria-hidden="true" id="regular-expression-filter"></a><a href="#regular-expression-filter" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Regular expression filter</h3>
+<p>The regular expression filter is similar to the selector filter, but using regular expressions. It matches the specified dimension with the given pattern. The pattern can be any standard <a href="http://docs.oracle.com/javase/6/docs/api/java/util/regex/Pattern.html">Java regular expression</a>.</p>
+<pre><code class="hljs css language-json">"filter": { "type": "regex", "dimension": &lt;dimension_string&gt;, "pattern": &lt;pattern_string&gt; }
+</code></pre>
+<p>The regex filter supports the use of extraction functions, see <a href="#filtering-with-extraction-functions">Filtering with Extraction Functions</a> for details.</p>
+<h3><a class="anchor" aria-hidden="true" id="logical-expression-filters"></a><a href="#logical-expression-filters" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Logical expression filters</h3>
+<h4><a class="anchor" aria-hidden="true" id="and"></a><a href="#and" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>AND</h4>
+<p>The grammar for an AND filter is as follows:</p>
+<pre><code class="hljs css language-json">"filter": { "type": "and", "fields": [&lt;filter&gt;, &lt;filter&gt;, ...] }
+</code></pre>
+<p>The filters in fields can be any other filter defined on this page.</p>
+<h4><a class="anchor" aria-hidden="true" id="or"></a><a href="#or" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>OR</h4>
+<p>The grammar for an OR filter is as follows:</p>
+<pre><code class="hljs css language-json">"filter": { "type": "or", "fields": [&lt;filter&gt;, &lt;filter&gt;, ...] }
+</code></pre>
+<p>The filters in fields can be any other filter defined on this page.</p>
+<h4><a class="anchor" aria-hidden="true" id="not"></a><a href="#not" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>NOT</h4>
+<p>The grammar for a NOT filter is as follows:</p>
+<pre><code class="hljs css language-json">"filter": { "type": "not", "field": &lt;filter&gt; }
+</code></pre>
+<p>The filter specified at field can be any other filter defined on this page.</p>
+<h3><a class="anchor" aria-hidden="true" id="javascript-filter"></a><a href="#javascript-filter" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>JavaScript filter</h3>
+<p>The JavaScript filter matches a dimension against the specified JavaScript function predicate. The filter matches values for which the function returns true.</p>
+<p>The function takes a single argument, the dimension value, and returns either true or false.</p>
+<pre><code class="hljs css language-json">{
+  <span class="hljs-attr">"type"</span> : <span class="hljs-string">"javascript"</span>,
+  <span class="hljs-attr">"dimension"</span> : &lt;dimension_string&gt;,
+  <span class="hljs-attr">"function"</span> : <span class="hljs-string">"function(value) { &lt;...&gt; }"</span>
+}
+</code></pre>
+<p><strong>Example</strong>
+The following matches any dimension values for the dimension <code>name</code> between <code>'bar'</code> and <code>'foo'</code></p>
+<pre><code class="hljs css language-json">{
+  <span class="hljs-attr">"type"</span> : <span class="hljs-string">"javascript"</span>,
+  <span class="hljs-attr">"dimension"</span> : <span class="hljs-string">"name"</span>,
+  <span class="hljs-attr">"function"</span> : <span class="hljs-string">"function(x) { return(x &gt;= 'bar' &amp;&amp; x &lt;= 'foo') }"</span>
+}
+</code></pre>
+<p>The JavaScript filter supports the use of extraction functions, see <a href="#filtering-with-extraction-functions">Filtering with Extraction Functions</a> for details.</p>
+<blockquote>
+<p>JavaScript-based functionality is disabled by default. Please refer to the Druid <a href="/docs/0.20.0/development/javascript.html">JavaScript programming guide</a> for guidelines about using Druid's JavaScript functionality, including instructions on how to enable it.</p>
+</blockquote>
+<h3><a class="anchor" aria-hidden="true" id="extraction-filter"></a><a href="#extraction-filter" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Extraction filter</h3>
+<blockquote>
+<p>The extraction filter is now deprecated. The selector filter with an extraction function specified
+provides identical functionality and should be used instead.</p>
+</blockquote>
+<p>Extraction filter matches a dimension using some specific <a href="./dimensionspecs.html#extraction-functions">Extraction function</a>.
+The following filter matches the values for which the extraction function has transformation entry <code>input_key=output_value</code> where
+<code>output_value</code> is equal to the filter <code>value</code> and <code>input_key</code> is present as dimension.</p>
+<p><strong>Example</strong>
+The following matches dimension values in <code>[product_1, product_3, product_5]</code> for the column <code>product</code></p>
+<pre><code class="hljs css language-json">{
+    <span class="hljs-attr">"filter"</span>: {
+        <span class="hljs-attr">"type"</span>: <span class="hljs-string">"extraction"</span>,
+        <span class="hljs-attr">"dimension"</span>: <span class="hljs-string">"product"</span>,
+        <span class="hljs-attr">"value"</span>: <span class="hljs-string">"bar_1"</span>,
+        <span class="hljs-attr">"extractionFn"</span>: {
+            <span class="hljs-attr">"type"</span>: <span class="hljs-string">"lookup"</span>,
+            <span class="hljs-attr">"lookup"</span>: {
+                <span class="hljs-attr">"type"</span>: <span class="hljs-string">"map"</span>,
+                <span class="hljs-attr">"map"</span>: {
+                    <span class="hljs-attr">"product_1"</span>: <span class="hljs-string">"bar_1"</span>,
+                    <span class="hljs-attr">"product_5"</span>: <span class="hljs-string">"bar_1"</span>,
+                    <span class="hljs-attr">"product_3"</span>: <span class="hljs-string">"bar_1"</span>
+                }
+            }
+        }
+    }
+}
+</code></pre>
+<h3><a class="anchor" aria-hidden="true" id="search-filter"></a><a href="#search-filter" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Search filter</h3>
+<p>Search filters can be used to filter on partial string matches.</p>
+<pre><code class="hljs css language-json">{
+    <span class="hljs-attr">"filter"</span>: {
+        <span class="hljs-attr">"type"</span>: <span class="hljs-string">"search"</span>,
+        <span class="hljs-attr">"dimension"</span>: <span class="hljs-string">"product"</span>,
+        <span class="hljs-attr">"query"</span>: {
+          <span class="hljs-attr">"type"</span>: <span class="hljs-string">"insensitive_contains"</span>,
+          <span class="hljs-attr">"value"</span>: <span class="hljs-string">"foo"</span>
+        }
+    }
+}
+</code></pre>
+<table>
+<thead>
+<tr><th>property</th><th>description</th><th>required?</th></tr>
+</thead>
+<tbody>
+<tr><td>type</td><td>This String should always be &quot;search&quot;.</td><td>yes</td></tr>
+<tr><td>dimension</td><td>The dimension to perform the search over.</td><td>yes</td></tr>
+<tr><td>query</td><td>A JSON object for the type of search. See below for more information.</td><td>yes</td></tr>
+<tr><td>extractionFn</td><td><a href="#filtering-with-extraction-functions">Extraction function</a> to apply to the dimension</td><td>no</td></tr>
+</tbody>
+</table>
+<p>The search filter supports the use of extraction functions, see <a href="#filtering-with-extraction-functions">Filtering with Extraction Functions</a> for details.</p>
+<h4><a class="anchor" aria-hidden="true" id="search-query-spec"></a><a href="#search-query-spec" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Search query spec</h4>
+<h5><a class="anchor" aria-hidden="true" id="contains"></a><a href="#contains" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Contains</h5>
+<table>
+<thead>
+<tr><th>property</th><th>description</th><th>required?</th></tr>
+</thead>
+<tbody>
+<tr><td>type</td><td>This String should always be &quot;contains&quot;.</td><td>yes</td></tr>
+<tr><td>value</td><td>A String value to run the search over.</td><td>yes</td></tr>
+<tr><td>caseSensitive</td><td>Whether two string should be compared as case sensitive or not</td><td>no (default == false)</td></tr>
+</tbody>
+</table>
+<h5><a class="anchor" aria-hidden="true" id="insensitive-contains"></a><a href="#insensitive-contains" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Insensitive Contains</h5>
+<table>
+<thead>
+<tr><th>property</th><th>description</th><th>required?</th></tr>
+</thead>
+<tbody>
+<tr><td>type</td><td>This String should always be &quot;insensitive_contains&quot;.</td><td>yes</td></tr>
+<tr><td>value</td><td>A String value to run the search over.</td><td>yes</td></tr>
+</tbody>
+</table>
+<p>Note that an &quot;insensitive_contains&quot; search is equivalent to a &quot;contains&quot; search with &quot;caseSensitive&quot;: false (or not
+provided).</p>
+<h5><a class="anchor" aria-hidden="true" id="fragment"></a><a href="#fragment" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Fragment</h5>
+<table>
+<thead>
+<tr><th>property</th><th>description</th><th>required?</th></tr>
+</thead>
+<tbody>
+<tr><td>type</td><td>This String should always be &quot;fragment&quot;.</td><td>yes</td></tr>
+<tr><td>values</td><td>A JSON array of String values to run the search over.</td><td>yes</td></tr>
+<tr><td>caseSensitive</td><td>Whether strings should be compared as case sensitive or not. Default: false(insensitive)</td><td>no</td></tr>
+</tbody>
+</table>
+<h3><a class="anchor" aria-hidden="true" id="in-filter"></a><a href="#in-filter" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>In filter</h3>
+<p>In filter can be used to express the following SQL query:</p>
+<pre><code class="hljs css language-sql"> <span class="hljs-keyword">SELECT</span> <span class="hljs-keyword">COUNT</span>(*) <span class="hljs-keyword">AS</span> <span class="hljs-string">'Count'</span> <span class="hljs-keyword">FROM</span> <span class="hljs-string">`table`</span> <span class="hljs-keyword">WHERE</span> <span class="hljs-string">`outlaw`</span> <span class="hljs-keyword">IN</span> (<span class="hljs-string">'Good'</span>, <span class="hljs-string">'Bad'</span>, <span class="hljs-string">'Ugly'</span>)
+</code></pre>
+<p>The grammar for a IN filter is as follows:</p>
+<pre><code class="hljs css language-json">{
+    <span class="hljs-attr">"type"</span>: <span class="hljs-string">"in"</span>,
+    <span class="hljs-attr">"dimension"</span>: <span class="hljs-string">"outlaw"</span>,
+    <span class="hljs-attr">"values"</span>: [<span class="hljs-string">"Good"</span>, <span class="hljs-string">"Bad"</span>, <span class="hljs-string">"Ugly"</span>]
+}
+</code></pre>
+<p>The IN filter supports the use of extraction functions, see <a href="#filtering-with-extraction-functions">Filtering with Extraction Functions</a> for details.</p>
+<p>If an empty <code>values</code> array is passed to the IN filter, it will simply return an empty result.
+If the <code>dimension</code> is a multi-valued dimension, the IN filter will return true if one of the dimension values is
+in the <code>values</code> array.</p>
+<h3><a class="anchor" aria-hidden="true" id="like-filter"></a><a href="#like-filter" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Like filter</h3>
+<p>Like filters can be used for basic wildcard searches. They are equivalent to the SQL LIKE operator. Special characters
+supported are &quot;%&quot; (matches any number of characters) and &quot;_&quot; (matches any one character).</p>
+<table>
+<thead>
+<tr><th>property</th><th>type</th><th>description</th><th>required?</th></tr>
+</thead>
+<tbody>
+<tr><td>type</td><td>String</td><td>This should always be &quot;like&quot;.</td><td>yes</td></tr>
+<tr><td>dimension</td><td>String</td><td>The dimension to filter on</td><td>yes</td></tr>
+<tr><td>pattern</td><td>String</td><td>LIKE pattern, such as &quot;foo%&quot; or &quot;___bar&quot;.</td><td>yes</td></tr>
+<tr><td>escape</td><td>String</td><td>An escape character that can be used to escape special characters.</td><td>no</td></tr>
+<tr><td>extractionFn</td><td><a href="#filtering-with-extraction-functions">Extraction function</a></td><td>Extraction function to apply to the dimension</td><td>no</td></tr>
+</tbody>
+</table>
+<p>Like filters support the use of extraction functions, see <a href="#filtering-with-extraction-functions">Filtering with Extraction Functions</a> for details.</p>
+<p>This Like filter expresses the condition <code>last_name LIKE &quot;D%&quot;</code> (i.e. last_name starts with &quot;D&quot;).</p>
+<pre><code class="hljs css language-json">{
+    <span class="hljs-attr">"type"</span>: <span class="hljs-string">"like"</span>,
+    <span class="hljs-attr">"dimension"</span>: <span class="hljs-string">"last_name"</span>,
+    <span class="hljs-attr">"pattern"</span>: <span class="hljs-string">"D%"</span>
+}
+</code></pre>
+<h3><a class="anchor" aria-hidden="true" id="bound-filter"></a><a href="#bound-filter" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Bound filter</h3>
+<p>Bound filters can be used to filter on ranges of dimension values. It can be used for comparison filtering like
+greater than, less than, greater than or equal to, less than or equal to, and &quot;between&quot; (if both &quot;lower&quot; and
+&quot;upper&quot; are set).</p>
+<table>
+<thead>
+<tr><th>property</th><th>type</th><th>description</th><th>required?</th></tr>
+</thead>
+<tbody>
+<tr><td>type</td><td>String</td><td>This should always be &quot;bound&quot;.</td><td>yes</td></tr>
+<tr><td>dimension</td><td>String</td><td>The dimension to filter on</td><td>yes</td></tr>
+<tr><td>lower</td><td>String</td><td>The lower bound for the filter</td><td>no</td></tr>
+<tr><td>upper</td><td>String</td><td>The upper bound for the filter</td><td>no</td></tr>
+<tr><td>lowerStrict</td><td>Boolean</td><td>Perform strict comparison on the lower bound (&quot;&gt;&quot; instead of &quot;&gt;=&quot;)</td><td>no, default: false</td></tr>
+<tr><td>upperStrict</td><td>Boolean</td><td>Perform strict comparison on the upper bound (&quot;&lt;&quot; instead of &quot;&lt;=&quot;)</td><td>no, default: false</td></tr>
+<tr><td>ordering</td><td>String</td><td>Specifies the sorting order to use when comparing values against the bound. Can be one of the following values: &quot;lexicographic&quot;, &quot;alphanumeric&quot;, &quot;numeric&quot;, &quot;strlen&quot;, &quot;version&quot;. See <a href="/docs/0.20.0/querying/sorting-orders.html">Sorting Orders</a> for more details.</td><td>no, default: &quot;lexicographic&quot;</td></tr>
+<tr><td>extractionFn</td><td><a href="#filtering-with-extraction-functions">Extraction function</a></td><td>Extraction function to apply to the dimension</td><td>no</td></tr>
+</tbody>
+</table>
+<p>Bound filters support the use of extraction functions, see <a href="#filtering-with-extraction-functions">Filtering with Extraction Functions</a> for details.</p>
+<p>The following bound filter expresses the condition <code>21 &lt;= age &lt;= 31</code>:</p>
+<pre><code class="hljs css language-json">{
+    <span class="hljs-attr">"type"</span>: <span class="hljs-string">"bound"</span>,
+    <span class="hljs-attr">"dimension"</span>: <span class="hljs-string">"age"</span>,
+    <span class="hljs-attr">"lower"</span>: <span class="hljs-string">"21"</span>,
+    <span class="hljs-attr">"upper"</span>: <span class="hljs-string">"31"</span> ,
+    <span class="hljs-attr">"ordering"</span>: <span class="hljs-string">"numeric"</span>
+}
+</code></pre>
+<p>This filter expresses the condition <code>foo &lt;= name &lt;= hoo</code>, using the default lexicographic sorting order.</p>
+<pre><code class="hljs css language-json">{
+    <span class="hljs-attr">"type"</span>: <span class="hljs-string">"bound"</span>,
+    <span class="hljs-attr">"dimension"</span>: <span class="hljs-string">"name"</span>,
+    <span class="hljs-attr">"lower"</span>: <span class="hljs-string">"foo"</span>,
+    <span class="hljs-attr">"upper"</span>: <span class="hljs-string">"hoo"</span>
+}
+</code></pre>
+<p>Using strict bounds, this filter expresses the condition <code>21 &lt; age &lt; 31</code></p>
+<pre><code class="hljs css language-json">{
+    <span class="hljs-attr">"type"</span>: <span class="hljs-string">"bound"</span>,
+    <span class="hljs-attr">"dimension"</span>: <span class="hljs-string">"age"</span>,
+    <span class="hljs-attr">"lower"</span>: <span class="hljs-string">"21"</span>,
+    <span class="hljs-attr">"lowerStrict"</span>: <span class="hljs-literal">true</span>,
+    <span class="hljs-attr">"upper"</span>: <span class="hljs-string">"31"</span> ,
+    <span class="hljs-attr">"upperStrict"</span>: <span class="hljs-literal">true</span>,
+    <span class="hljs-attr">"ordering"</span>: <span class="hljs-string">"numeric"</span>
+}
+</code></pre>
+<p>The user can also specify a one-sided bound by omitting &quot;upper&quot; or &quot;lower&quot;. This filter expresses <code>age &lt; 31</code>.</p>
+<pre><code class="hljs css language-json">{
+    <span class="hljs-attr">"type"</span>: <span class="hljs-string">"bound"</span>,
+    <span class="hljs-attr">"dimension"</span>: <span class="hljs-string">"age"</span>,
+    <span class="hljs-attr">"upper"</span>: <span class="hljs-string">"31"</span> ,
+    <span class="hljs-attr">"upperStrict"</span>: <span class="hljs-literal">true</span>,
+    <span class="hljs-attr">"ordering"</span>: <span class="hljs-string">"numeric"</span>
+}
+</code></pre>
+<p>Likewise, this filter expresses <code>age &gt;= 18</code></p>
+<pre><code class="hljs css language-json">{
+    <span class="hljs-attr">"type"</span>: <span class="hljs-string">"bound"</span>,
+    <span class="hljs-attr">"dimension"</span>: <span class="hljs-string">"age"</span>,
+    <span class="hljs-attr">"lower"</span>: <span class="hljs-string">"18"</span> ,
+    <span class="hljs-attr">"ordering"</span>: <span class="hljs-string">"numeric"</span>
+}
+</code></pre>
+<h3><a class="anchor" aria-hidden="true" id="interval-filter"></a><a href="#interval-filter" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Interval Filter</h3>
+<p>The Interval filter enables range filtering on columns that contain long millisecond values, with the boundaries specified as ISO 8601 time intervals. It is suitable for the <code>__time</code> column, long metric columns, and dimensions with values that can be parsed as long milliseconds.</p>
+<p>This filter converts the ISO 8601 intervals to long millisecond start/end ranges and translates to an OR of Bound filters on those millisecond ranges, with numeric comparison. The Bound filters will have left-closed and right-open matching (i.e., start &lt;= time &lt; end).</p>
+<table>
+<thead>
+<tr><th>property</th><th>type</th><th>description</th><th>required?</th></tr>
+</thead>
+<tbody>
+<tr><td>type</td><td>String</td><td>This should always be &quot;interval&quot;.</td><td>yes</td></tr>
+<tr><td>dimension</td><td>String</td><td>The dimension to filter on</td><td>yes</td></tr>
+<tr><td>intervals</td><td>Array</td><td>A JSON array containing ISO-8601 interval strings. This defines the time ranges to filter on.</td><td>yes</td></tr>
+<tr><td>extractionFn</td><td><a href="#filtering-with-extraction-functions">Extraction function</a></td><td>Extraction function to apply to the dimension</td><td>no</td></tr>
+</tbody>
+</table>
+<p>The interval filter supports the use of extraction functions, see <a href="#filtering-with-extraction-functions">Filtering with Extraction Functions</a> for details.</p>
+<p>If an extraction function is used with this filter, the extraction function should output values that are parseable as long milliseconds.</p>
+<p>The following example filters on the time ranges of October 1-7, 2014 and November 15-16, 2014.</p>
+<pre><code class="hljs css language-json">{
+    <span class="hljs-attr">"type"</span> : <span class="hljs-string">"interval"</span>,
+    <span class="hljs-attr">"dimension"</span> : <span class="hljs-string">"__time"</span>,
+    <span class="hljs-attr">"intervals"</span> : [
+      <span class="hljs-string">"2014-10-01T00:00:00.000Z/2014-10-07T00:00:00.000Z"</span>,
+      <span class="hljs-string">"2014-11-15T00:00:00.000Z/2014-11-16T00:00:00.000Z"</span>
+    ]
+}
+</code></pre>
+<p>The filter above is equivalent to the following OR of Bound filters:</p>
+<pre><code class="hljs css language-json">{
+    <span class="hljs-attr">"type"</span>: <span class="hljs-string">"or"</span>,
+    <span class="hljs-attr">"fields"</span>: [
+      {
+        <span class="hljs-attr">"type"</span>: <span class="hljs-string">"bound"</span>,
+        <span class="hljs-attr">"dimension"</span>: <span class="hljs-string">"__time"</span>,
+        <span class="hljs-attr">"lower"</span>: <span class="hljs-string">"1412121600000"</span>,
+        <span class="hljs-attr">"lowerStrict"</span>: <span class="hljs-literal">false</span>,
+        <span class="hljs-attr">"upper"</span>: <span class="hljs-string">"1412640000000"</span> ,
+        <span class="hljs-attr">"upperStrict"</span>: <span class="hljs-literal">true</span>,
+        <span class="hljs-attr">"ordering"</span>: <span class="hljs-string">"numeric"</span>
+      },
+      {
+         <span class="hljs-attr">"type"</span>: <span class="hljs-string">"bound"</span>,
+         <span class="hljs-attr">"dimension"</span>: <span class="hljs-string">"__time"</span>,
+         <span class="hljs-attr">"lower"</span>: <span class="hljs-string">"1416009600000"</span>,
+         <span class="hljs-attr">"lowerStrict"</span>: <span class="hljs-literal">false</span>,
+         <span class="hljs-attr">"upper"</span>: <span class="hljs-string">"1416096000000"</span> ,
+         <span class="hljs-attr">"upperStrict"</span>: <span class="hljs-literal">true</span>,
+         <span class="hljs-attr">"ordering"</span>: <span class="hljs-string">"numeric"</span>
+      }
+    ]
+}
+</code></pre>
+<h3><a class="anchor" aria-hidden="true" id="filtering-with-extraction-functions"></a><a href="#filtering-with-extraction-functions" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Filtering with Extraction Functions</h3>
+<p>All filters except the &quot;spatial&quot; filter support extraction functions.
+An extraction function is defined by setting the &quot;extractionFn&quot; field on a filter.
+See <a href="./dimensionspecs.html#extraction-functions">Extraction function</a> for more details on extraction functions.</p>
+<p>If specified, the extraction function will be used to transform input values before the filter is applied.
+The example below shows a selector filter combined with an extraction function. This filter will transform input values
+according to the values defined in the lookup map; transformed values will then be matched with the string &quot;bar_1&quot;.</p>
+<p><strong>Example</strong>
+The following matches dimension values in <code>[product_1, product_3, product_5]</code> for the column <code>product</code></p>
+<pre><code class="hljs css language-json">{
+    <span class="hljs-attr">"filter"</span>: {
+        <span class="hljs-attr">"type"</span>: <span class="hljs-string">"selector"</span>,
+        <span class="hljs-attr">"dimension"</span>: <span class="hljs-string">"product"</span>,
+        <span class="hljs-attr">"value"</span>: <span class="hljs-string">"bar_1"</span>,
+        <span class="hljs-attr">"extractionFn"</span>: {
+            <span class="hljs-attr">"type"</span>: <span class="hljs-string">"lookup"</span>,
+            <span class="hljs-attr">"lookup"</span>: {
+                <span class="hljs-attr">"type"</span>: <span class="hljs-string">"map"</span>,
+                <span class="hljs-attr">"map"</span>: {
+                    <span class="hljs-attr">"product_1"</span>: <span class="hljs-string">"bar_1"</span>,
+                    <span class="hljs-attr">"product_5"</span>: <span class="hljs-string">"bar_1"</span>,
+                    <span class="hljs-attr">"product_3"</span>: <span class="hljs-string">"bar_1"</span>
+                }
+            }
+        }
+    }
+}
+</code></pre>
+<h2><a class="anchor" aria-hidden="true" id="column-types"></a><a href="#column-types" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Column types</h2>
+<p>Druid supports filtering on timestamp, string, long, and float columns.</p>
+<p>Note that only string columns have bitmap indexes. Therefore, queries that filter on other column types will need to
+scan those columns.</p>
+<h3><a class="anchor" aria-hidden="true" id="filtering-on-numeric-columns"></a><a href="#filtering-on-numeric-columns" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Filtering on numeric columns</h3>
+<p>When filtering on numeric columns, you can write filters as if they were strings. In most cases, your filter will be
+converted into a numeric predicate and will be applied to the numeric column values directly. In some cases (such as
+the &quot;regex&quot; filter) the numeric column values will be converted to strings during the scan.</p>
+<p>For example, filtering on a specific value, <code>myFloatColumn = 10.1</code>:</p>
+<pre><code class="hljs css language-json">"filter": {
+  "type": "selector",
+  "dimension": "myFloatColumn",
+  "value": "10.1"
+}
+</code></pre>
+<p>Filtering on a range of values, <code>10 &lt;= myFloatColumn &lt; 20</code>:</p>
+<pre><code class="hljs css language-json">"filter": {
+  "type": "bound",
+  "dimension": "myFloatColumn",
+  "ordering": "numeric",
+  "lower": "10",
+  "lowerStrict": false,
+  "upper": "20",
+  "upperStrict": true
+}
+</code></pre>
+<h3><a class="anchor" aria-hidden="true" id="filtering-on-the-timestamp-column"></a><a href="#filtering-on-the-timestamp-column" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Filtering on the Timestamp Column</h3>
+<p>Query filters can also be applied to the timestamp column. The timestamp column has long millisecond values. To refer
+to the timestamp column, use the string <code>__time</code> as the dimension name. Like numeric dimensions, timestamp filters
+should be specified as if the timestamp values were strings.</p>
+<p>If the user wishes to interpret the timestamp with a specific format, timezone, or locale, the <a href="./dimensionspecs.html#time-format-extraction-function">Time Format Extraction Function</a> is useful.</p>
+<p>For example, filtering on a long timestamp value:</p>
+<pre><code class="hljs css language-json">"filter": {
+  "type": "selector",
+  "dimension": "__time",
+  "value": "124457387532"
+}
+</code></pre>
+<p>Filtering on day of week:</p>
+<pre><code class="hljs css language-json">"filter": {
+  "type": "selector",
+  "dimension": "__time",
+  "value": "Friday",
+  "extractionFn": {
+    "type": "timeFormat",
+    "format": "EEEE",
+    "timeZone": "America/New_York",
+    "locale": "en"
+  }
+}
+</code></pre>
+<p>Filtering on a set of ISO 8601 intervals:</p>
+<pre><code class="hljs css language-json">{
+    <span class="hljs-attr">"type"</span> : <span class="hljs-string">"interval"</span>,
+    <span class="hljs-attr">"dimension"</span> : <span class="hljs-string">"__time"</span>,
+    <span class="hljs-attr">"intervals"</span> : [
+      <span class="hljs-string">"2014-10-01T00:00:00.000Z/2014-10-07T00:00:00.000Z"</span>,
+      <span class="hljs-string">"2014-11-15T00:00:00.000Z/2014-11-16T00:00:00.000Z"</span>
+    ]
+}
+</code></pre>
+<h3><a class="anchor" aria-hidden="true" id="true-filter"></a><a href="#true-filter" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>True Filter</h3>
+<p>The true filter is a filter which matches all values.  It can be used to temporarily disable other filters without removing the filter.</p>
+<pre><code class="hljs css language-json">
+{ <span class="hljs-attr">"type"</span> : <span class="hljs-string">"true"</span> }
+</code></pre>
+</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/0.20.0/querying/datasourcemetadataquery.html"><span class="arrow-prev">← </span><span class="function-name-prevnext">DatasourceMetadata</span></a><a class="docs-next button" href="/docs/0.20.0/querying/granularities.html"><span>Granularities</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#column-types">Column types</a><ul class="toc-headings"><li><a href="#filtering-on-numeric-columns">Filtering on numeric columns</a></li><li><a href="#filtering-on-the-timestamp-column">Filtering on the Timestamp Column</a></li><li><a href="#true-filter">True Filter</a></li></ul></li></ul></nav></div><footer class="nav-footer druid-footer" id="footer"><div class="container"><div class="text-center"><p><a href="/technology">Technology</a> · <a href="/use-cases">Use Cases</a> · <a href="/druid-powered">Powered by Druid</a> · <a href="/docs/0.20.0/latest">Docs</a> · <a href="/community/">Community</a> · <a href="/downloads.html">Download</a> · <a href="/faq">FAQ</a></p></div><div class="text-center"><a title="Join the user group" href="https://groups.google.com/forum/#!forum/druid-user" target="_blank"><span class="fa fa-comments"></span></a> · <a title="Follow Druid" href="https://twitter.com/druidio" target="_blank"><span class="fab fa-twitter"></span></a> · <a title="Download via Apache" href="https://www.apache.org/dyn/closer.cgi?path=/incubator/druid/{{ site.druid_versions[0].versions[0].version }}/apache-druid-{{ site.druid_versions[0].versions[0].version }}-bin.tar.gz" target="_blank"><span class="fas fa-feather"></span></a> · <a title="GitHub" href="https://github.com/apache/druid" target="_blank"><span class="fab fa-github"></span></a></div><div class="text-center license">Copyright © 2019 <a href="https://www.apache.org/" target="_blank">Apache Software Foundation</a>.<br/>Except where otherwise noted, licensed under <a rel="license" href="http://creativecommons.org/licenses/by-sa/4.0/">CC BY-SA 4.0</a>.<br/>Apache Druid, Druid, and the Druid logo are either registered trademarks or trademarks of The Apache Software Foundation in the United States and other countries.</div></div></footer></div><script type="text/javascript" src="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.js"></script><script>
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+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Query granularities · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/0.20.0/querying/granularities.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.20.0" /><meta property="og:title" content="Query granularities · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
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+<blockquote>
+<p>Apache Druid supports two query languages: <a href="/docs/0.20.0/querying/sql.html">Druid SQL</a> and <a href="/docs/0.20.0/querying/querying.html">native queries</a>.
+This document describes the native
+language. For information about time functions available in SQL, refer to the
+<a href="/docs/0.20.0/querying/sql.html#time-functions">SQL documentation</a>.</p>
+</blockquote>
+<p>The granularity field determines how data gets bucketed across the time dimension, or how it gets aggregated by hour, day, minute, etc.</p>
+<p>It can be specified either as a string for simple granularities or as an object for arbitrary granularities.</p>
+<h3><a class="anchor" aria-hidden="true" id="simple-granularities"></a><a href="#simple-granularities" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Simple Granularities</h3>
+<p>Simple granularities are specified as a string and bucket timestamps by their UTC time (e.g., days start at 00:00 UTC).</p>
+<p>Supported granularity strings are: <code>all</code>, <code>none</code>, <code>second</code>, <code>minute</code>, <code>fifteen_minute</code>, <code>thirty_minute</code>, <code>hour</code>, <code>day</code>, <code>week</code>, <code>month</code>, <code>quarter</code> and <code>year</code>.</p>
+<ul>
+<li><code>all</code> buckets everything into a single bucket</li>
+<li><code>none</code> does not bucket data (it actually uses the granularity of the index - minimum here is <code>none</code> which means millisecond granularity). Using <code>none</code> in a <a href="/docs/0.20.0/querying/timeseriesquery.html">TimeseriesQuery</a> is currently not recommended (the system will try to generate 0 values for all milliseconds that didn’t exist, which is often a lot).</li>
+</ul>
+<h4><a class="anchor" aria-hidden="true" id="example"></a><a href="#example" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Example:</h4>
+<p>Suppose you have data below stored in Apache Druid with millisecond ingestion granularity,</p>
+<pre><code class="hljs css language-json">{<span class="hljs-attr">"timestamp"</span>: <span class="hljs-string">"2013-08-31T01:02:33Z"</span>, <span class="hljs-attr">"page"</span>: <span class="hljs-string">"AAA"</span>, <span class="hljs-attr">"language"</span> : <span class="hljs-string">"en"</span>}
+{<span class="hljs-attr">"timestamp"</span>: <span class="hljs-string">"2013-09-01T01:02:33Z"</span>, <span class="hljs-attr">"page"</span>: <span class="hljs-string">"BBB"</span>, <span class="hljs-attr">"language"</span> : <span class="hljs-string">"en"</span>}
+{<span class="hljs-attr">"timestamp"</span>: <span class="hljs-string">"2013-09-02T23:32:45Z"</span>, <span class="hljs-attr">"page"</span>: <span class="hljs-string">"CCC"</span>, <span class="hljs-attr">"language"</span> : <span class="hljs-string">"en"</span>}
+{<span class="hljs-attr">"timestamp"</span>: <span class="hljs-string">"2013-09-03T03:32:45Z"</span>, <span class="hljs-attr">"page"</span>: <span class="hljs-string">"DDD"</span>, <span class="hljs-attr">"language"</span> : <span class="hljs-string">"en"</span>}
+</code></pre>
+<p>After submitting a groupBy query with <code>hour</code> granularity,</p>
+<pre><code class="hljs css language-json">{
+   <span class="hljs-attr">"queryType"</span>:<span class="hljs-string">"groupBy"</span>,
+   <span class="hljs-attr">"dataSource"</span>:<span class="hljs-string">"my_dataSource"</span>,
+   <span class="hljs-attr">"granularity"</span>:<span class="hljs-string">"hour"</span>,
+   <span class="hljs-attr">"dimensions"</span>:[
+      <span class="hljs-string">"language"</span>
+   ],
+   <span class="hljs-attr">"aggregations"</span>:[
+      {
+         <span class="hljs-attr">"type"</span>:<span class="hljs-string">"count"</span>,
+         <span class="hljs-attr">"name"</span>:<span class="hljs-string">"count"</span>
+      }
+   ],
+   <span class="hljs-attr">"intervals"</span>:[
+      <span class="hljs-string">"2000-01-01T00:00Z/3000-01-01T00:00Z"</span>
+   ]
+}
+</code></pre>
+<p>you will get</p>
+<pre><code class="hljs css language-json">[ {
+  <span class="hljs-attr">"version"</span> : <span class="hljs-string">"v1"</span>,
+  <span class="hljs-attr">"timestamp"</span> : <span class="hljs-string">"2013-08-31T01:00:00.000Z"</span>,
+  <span class="hljs-attr">"event"</span> : {
+    <span class="hljs-attr">"count"</span> : <span class="hljs-number">1</span>,
+    <span class="hljs-attr">"language"</span> : <span class="hljs-string">"en"</span>
+  }
+}, {
+  <span class="hljs-attr">"version"</span> : <span class="hljs-string">"v1"</span>,
+  <span class="hljs-attr">"timestamp"</span> : <span class="hljs-string">"2013-09-01T01:00:00.000Z"</span>,
+  <span class="hljs-attr">"event"</span> : {
+    <span class="hljs-attr">"count"</span> : <span class="hljs-number">1</span>,
+    <span class="hljs-attr">"language"</span> : <span class="hljs-string">"en"</span>
+  }
+}, {
+  <span class="hljs-attr">"version"</span> : <span class="hljs-string">"v1"</span>,
+  <span class="hljs-attr">"timestamp"</span> : <span class="hljs-string">"2013-09-02T23:00:00.000Z"</span>,
+  <span class="hljs-attr">"event"</span> : {
+    <span class="hljs-attr">"count"</span> : <span class="hljs-number">1</span>,
+    <span class="hljs-attr">"language"</span> : <span class="hljs-string">"en"</span>
+  }
+}, {
+  <span class="hljs-attr">"version"</span> : <span class="hljs-string">"v1"</span>,
+  <span class="hljs-attr">"timestamp"</span> : <span class="hljs-string">"2013-09-03T03:00:00.000Z"</span>,
+  <span class="hljs-attr">"event"</span> : {
+    <span class="hljs-attr">"count"</span> : <span class="hljs-number">1</span>,
+    <span class="hljs-attr">"language"</span> : <span class="hljs-string">"en"</span>
+  }
+} ]
+</code></pre>
+<p>Note that all the empty buckets are discarded.</p>
+<p>If you change the granularity to <code>day</code>, you will get</p>
+<pre><code class="hljs css language-json">[ {
+  <span class="hljs-attr">"version"</span> : <span class="hljs-string">"v1"</span>,
+  <span class="hljs-attr">"timestamp"</span> : <span class="hljs-string">"2013-08-31T00:00:00.000Z"</span>,
+  <span class="hljs-attr">"event"</span> : {
+    <span class="hljs-attr">"count"</span> : <span class="hljs-number">1</span>,
+    <span class="hljs-attr">"language"</span> : <span class="hljs-string">"en"</span>
+  }
+}, {
+  <span class="hljs-attr">"version"</span> : <span class="hljs-string">"v1"</span>,
+  <span class="hljs-attr">"timestamp"</span> : <span class="hljs-string">"2013-09-01T00:00:00.000Z"</span>,
+  <span class="hljs-attr">"event"</span> : {
+    <span class="hljs-attr">"count"</span> : <span class="hljs-number">1</span>,
+    <span class="hljs-attr">"language"</span> : <span class="hljs-string">"en"</span>
+  }
+}, {
+  <span class="hljs-attr">"version"</span> : <span class="hljs-string">"v1"</span>,
+  <span class="hljs-attr">"timestamp"</span> : <span class="hljs-string">"2013-09-02T00:00:00.000Z"</span>,
+  <span class="hljs-attr">"event"</span> : {
+    <span class="hljs-attr">"count"</span> : <span class="hljs-number">1</span>,
+    <span class="hljs-attr">"language"</span> : <span class="hljs-string">"en"</span>
+  }
+}, {
+  <span class="hljs-attr">"version"</span> : <span class="hljs-string">"v1"</span>,
+  <span class="hljs-attr">"timestamp"</span> : <span class="hljs-string">"2013-09-03T00:00:00.000Z"</span>,
+  <span class="hljs-attr">"event"</span> : {
+    <span class="hljs-attr">"count"</span> : <span class="hljs-number">1</span>,
+    <span class="hljs-attr">"language"</span> : <span class="hljs-string">"en"</span>
+  }
+} ]
+</code></pre>
+<p>If you change the granularity to <code>none</code>, you will get the same results as setting it to the ingestion granularity.</p>
+<pre><code class="hljs css language-json">[ {
+  <span class="hljs-attr">"version"</span> : <span class="hljs-string">"v1"</span>,
+  <span class="hljs-attr">"timestamp"</span> : <span class="hljs-string">"2013-08-31T01:02:33.000Z"</span>,
+  <span class="hljs-attr">"event"</span> : {
+    <span class="hljs-attr">"count"</span> : <span class="hljs-number">1</span>,
+    <span class="hljs-attr">"language"</span> : <span class="hljs-string">"en"</span>
+  }
+}, {
+  <span class="hljs-attr">"version"</span> : <span class="hljs-string">"v1"</span>,
+  <span class="hljs-attr">"timestamp"</span> : <span class="hljs-string">"2013-09-01T01:02:33.000Z"</span>,
+  <span class="hljs-attr">"event"</span> : {
+    <span class="hljs-attr">"count"</span> : <span class="hljs-number">1</span>,
+    <span class="hljs-attr">"language"</span> : <span class="hljs-string">"en"</span>
+  }
+}, {
+  <span class="hljs-attr">"version"</span> : <span class="hljs-string">"v1"</span>,
+  <span class="hljs-attr">"timestamp"</span> : <span class="hljs-string">"2013-09-02T23:32:45.000Z"</span>,
+  <span class="hljs-attr">"event"</span> : {
+    <span class="hljs-attr">"count"</span> : <span class="hljs-number">1</span>,
+    <span class="hljs-attr">"language"</span> : <span class="hljs-string">"en"</span>
+  }
+}, {
+  <span class="hljs-attr">"version"</span> : <span class="hljs-string">"v1"</span>,
+  <span class="hljs-attr">"timestamp"</span> : <span class="hljs-string">"2013-09-03T03:32:45.000Z"</span>,
+  <span class="hljs-attr">"event"</span> : {
+    <span class="hljs-attr">"count"</span> : <span class="hljs-number">1</span>,
+    <span class="hljs-attr">"language"</span> : <span class="hljs-string">"en"</span>
+  }
+} ]
+</code></pre>
+<p>Having a query time <code>granularity</code> that is smaller than the <code>queryGranularity</code> parameter set at
+<a href="/docs/0.20.0/ingestion/index.html#granularityspec">ingestion time</a> is unreasonable because information about that
+smaller granularity is not present in the indexed data. So, if the query time granularity is smaller than the ingestion
+time query granularity, Druid produces results that are equivalent to having set <code>granularity</code> to <code>queryGranularity</code>.</p>
+<p>If you change the granularity to <code>all</code>, you will get everything aggregated in 1 bucket,</p>
+<pre><code class="hljs css language-json">[ {
+  <span class="hljs-attr">"version"</span> : <span class="hljs-string">"v1"</span>,
+  <span class="hljs-attr">"timestamp"</span> : <span class="hljs-string">"2000-01-01T00:00:00.000Z"</span>,
+  <span class="hljs-attr">"event"</span> : {
+    <span class="hljs-attr">"count"</span> : <span class="hljs-number">4</span>,
+    <span class="hljs-attr">"language"</span> : <span class="hljs-string">"en"</span>
+  }
+} ]
+</code></pre>
+<h3><a class="anchor" aria-hidden="true" id="duration-granularities"></a><a href="#duration-granularities" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Duration Granularities</h3>
+<p>Duration granularities are specified as an exact duration in milliseconds and timestamps are returned as UTC. Duration granularity values are in millis.</p>
+<p>They also support specifying an optional origin, which defines where to start counting time buckets from (defaults to 1970-01-01T00:00:00Z).</p>
+<pre><code class="hljs css language-javascript">{<span class="hljs-string">"type"</span>: <span class="hljs-string">"duration"</span>, <span class="hljs-string">"duration"</span>: <span class="hljs-number">7200000</span>}
+</code></pre>
+<p>This chunks up every 2 hours.</p>
+<pre><code class="hljs css language-javascript">{<span class="hljs-string">"type"</span>: <span class="hljs-string">"duration"</span>, <span class="hljs-string">"duration"</span>: <span class="hljs-number">3600000</span>, <span class="hljs-string">"origin"</span>: <span class="hljs-string">"2012-01-01T00:30:00Z"</span>}
+</code></pre>
+<p>This chunks up every hour on the half-hour.</p>
+<h4><a class="anchor" aria-hidden="true" id="example-1"></a><a href="#example-1" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Example:</h4>
+<p>Reusing the data in the previous example, after submitting a groupBy query with 24 hours duration,</p>
+<pre><code class="hljs css language-json">{
+   <span class="hljs-attr">"queryType"</span>:<span class="hljs-string">"groupBy"</span>,
+   <span class="hljs-attr">"dataSource"</span>:<span class="hljs-string">"my_dataSource"</span>,
+   <span class="hljs-attr">"granularity"</span>:{<span class="hljs-attr">"type"</span>: <span class="hljs-string">"duration"</span>, <span class="hljs-attr">"duration"</span>: <span class="hljs-string">"86400000"</span>},
+   <span class="hljs-attr">"dimensions"</span>:[
+      <span class="hljs-string">"language"</span>
+   ],
+   <span class="hljs-attr">"aggregations"</span>:[
+      {
+         <span class="hljs-attr">"type"</span>:<span class="hljs-string">"count"</span>,
+         <span class="hljs-attr">"name"</span>:<span class="hljs-string">"count"</span>
+      }
+   ],
+   <span class="hljs-attr">"intervals"</span>:[
+      <span class="hljs-string">"2000-01-01T00:00Z/3000-01-01T00:00Z"</span>
+   ]
+}
+</code></pre>
+<p>you will get</p>
+<pre><code class="hljs css language-json">[ {
+  <span class="hljs-attr">"version"</span> : <span class="hljs-string">"v1"</span>,
+  <span class="hljs-attr">"timestamp"</span> : <span class="hljs-string">"2013-08-31T00:00:00.000Z"</span>,
+  <span class="hljs-attr">"event"</span> : {
+    <span class="hljs-attr">"count"</span> : <span class="hljs-number">1</span>,
+    <span class="hljs-attr">"language"</span> : <span class="hljs-string">"en"</span>
+  }
+}, {
+  <span class="hljs-attr">"version"</span> : <span class="hljs-string">"v1"</span>,
+  <span class="hljs-attr">"timestamp"</span> : <span class="hljs-string">"2013-09-01T00:00:00.000Z"</span>,
+  <span class="hljs-attr">"event"</span> : {
+    <span class="hljs-attr">"count"</span> : <span class="hljs-number">1</span>,
+    <span class="hljs-attr">"language"</span> : <span class="hljs-string">"en"</span>
+  }
+}, {
+  <span class="hljs-attr">"version"</span> : <span class="hljs-string">"v1"</span>,
+  <span class="hljs-attr">"timestamp"</span> : <span class="hljs-string">"2013-09-02T00:00:00.000Z"</span>,
+  <span class="hljs-attr">"event"</span> : {
+    <span class="hljs-attr">"count"</span> : <span class="hljs-number">1</span>,
+    <span class="hljs-attr">"language"</span> : <span class="hljs-string">"en"</span>
+  }
+}, {
+  <span class="hljs-attr">"version"</span> : <span class="hljs-string">"v1"</span>,
+  <span class="hljs-attr">"timestamp"</span> : <span class="hljs-string">"2013-09-03T00:00:00.000Z"</span>,
+  <span class="hljs-attr">"event"</span> : {
+    <span class="hljs-attr">"count"</span> : <span class="hljs-number">1</span>,
+    <span class="hljs-attr">"language"</span> : <span class="hljs-string">"en"</span>
+  }
+} ]
+</code></pre>
+<p>if you set the origin for the granularity to <code>2012-01-01T00:30:00Z</code>,</p>
+<pre><code class="hljs css language-javascript">   <span class="hljs-string">"granularity"</span>:{<span class="hljs-string">"type"</span>: <span class="hljs-string">"duration"</span>, <span class="hljs-string">"duration"</span>: <span class="hljs-string">"86400000"</span>, <span class="hljs-string">"origin"</span>:<span class="hljs-string">"2012-01-01T00:30:00Z"</span>}
+</code></pre>
+<p>you will get</p>
+<pre><code class="hljs css language-json">[ {
+  <span class="hljs-attr">"version"</span> : <span class="hljs-string">"v1"</span>,
+  <span class="hljs-attr">"timestamp"</span> : <span class="hljs-string">"2013-08-31T00:30:00.000Z"</span>,
+  <span class="hljs-attr">"event"</span> : {
+    <span class="hljs-attr">"count"</span> : <span class="hljs-number">1</span>,
+    <span class="hljs-attr">"language"</span> : <span class="hljs-string">"en"</span>
+  }
+}, {
+  <span class="hljs-attr">"version"</span> : <span class="hljs-string">"v1"</span>,
+  <span class="hljs-attr">"timestamp"</span> : <span class="hljs-string">"2013-09-01T00:30:00.000Z"</span>,
+  <span class="hljs-attr">"event"</span> : {
+    <span class="hljs-attr">"count"</span> : <span class="hljs-number">1</span>,
+    <span class="hljs-attr">"language"</span> : <span class="hljs-string">"en"</span>
+  }
+}, {
+  <span class="hljs-attr">"version"</span> : <span class="hljs-string">"v1"</span>,
+  <span class="hljs-attr">"timestamp"</span> : <span class="hljs-string">"2013-09-02T00:30:00.000Z"</span>,
+  <span class="hljs-attr">"event"</span> : {
+    <span class="hljs-attr">"count"</span> : <span class="hljs-number">1</span>,
+    <span class="hljs-attr">"language"</span> : <span class="hljs-string">"en"</span>
+  }
+}, {
+  <span class="hljs-attr">"version"</span> : <span class="hljs-string">"v1"</span>,
+  <span class="hljs-attr">"timestamp"</span> : <span class="hljs-string">"2013-09-03T00:30:00.000Z"</span>,
+  <span class="hljs-attr">"event"</span> : {
+    <span class="hljs-attr">"count"</span> : <span class="hljs-number">1</span>,
+    <span class="hljs-attr">"language"</span> : <span class="hljs-string">"en"</span>
+  }
+} ]
+</code></pre>
+<p>Note that the timestamp for each bucket starts at the 30th minute.</p>
+<h3><a class="anchor" aria-hidden="true" id="period-granularities"></a><a href="#period-granularities" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Period Granularities</h3>
+<p>Period granularities are specified as arbitrary period combinations of years, months, weeks, hours, minutes and seconds (e.g. P2W, P3M, PT1H30M, PT0.750S) in <a href="https://en.wikipedia.org/wiki/ISO_8601">ISO8601</a> format. They support specifying a time zone which determines where period boundaries start as well as the timezone of the returned timestamps. By default, years start on the first of January, months start on the first of the month and weeks start on Mondays unless an origin is specified.</p>
+<p>Time zone is optional (defaults to UTC). Origin is optional (defaults to 1970-01-01T00:00:00 in the given time zone).</p>
+<pre><code class="hljs css language-javascript">{<span class="hljs-string">"type"</span>: <span class="hljs-string">"period"</span>, <span class="hljs-string">"period"</span>: <span class="hljs-string">"P2D"</span>, <span class="hljs-string">"timeZone"</span>: <span class="hljs-string">"America/Los_Angeles"</span>}
+</code></pre>
+<p>This will bucket by two-day chunks in the Pacific timezone.</p>
+<pre><code class="hljs css language-javascript">{<span class="hljs-string">"type"</span>: <span class="hljs-string">"period"</span>, <span class="hljs-string">"period"</span>: <span class="hljs-string">"P3M"</span>, <span class="hljs-string">"timeZone"</span>: <span class="hljs-string">"America/Los_Angeles"</span>, <span class="hljs-string">"origin"</span>: <span class="hljs-string">"2012-02-01T00:00:00-08:00"</span>}
+</code></pre>
+<p>This will bucket by 3-month chunks in the Pacific timezone where the three-month quarters are defined as starting from February.</p>
+<h4><a class="anchor" aria-hidden="true" id="example-2"></a><a href="#example-2" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Example</h4>
+<p>Reusing the data in the previous example, if you submit a groupBy query with 1 day period in Pacific timezone,</p>
+<pre><code class="hljs css language-json">{
+   <span class="hljs-attr">"queryType"</span>:<span class="hljs-string">"groupBy"</span>,
+   <span class="hljs-attr">"dataSource"</span>:<span class="hljs-string">"my_dataSource"</span>,
+   <span class="hljs-attr">"granularity"</span>:{<span class="hljs-attr">"type"</span>: <span class="hljs-string">"period"</span>, <span class="hljs-attr">"period"</span>: <span class="hljs-string">"P1D"</span>, <span class="hljs-attr">"timeZone"</span>: <span class="hljs-string">"America/Los_Angeles"</span>},
+   <span class="hljs-attr">"dimensions"</span>:[
+      <span class="hljs-string">"language"</span>
+   ],
+   <span class="hljs-attr">"aggregations"</span>:[
+      {
+         <span class="hljs-attr">"type"</span>:<span class="hljs-string">"count"</span>,
+         <span class="hljs-attr">"name"</span>:<span class="hljs-string">"count"</span>
+      }
+   ],
+   <span class="hljs-attr">"intervals"</span>:[
+      <span class="hljs-string">"1999-12-31T16:00:00.000-08:00/2999-12-31T16:00:00.000-08:00"</span>
+   ]
+}
+</code></pre>
+<p>you will get</p>
+<pre><code class="hljs css language-json">[ {
+  <span class="hljs-attr">"version"</span> : <span class="hljs-string">"v1"</span>,
+  <span class="hljs-attr">"timestamp"</span> : <span class="hljs-string">"2013-08-30T00:00:00.000-07:00"</span>,
+  <span class="hljs-attr">"event"</span> : {
+    <span class="hljs-attr">"count"</span> : <span class="hljs-number">1</span>,
+    <span class="hljs-attr">"language"</span> : <span class="hljs-string">"en"</span>
+  }
+}, {
+  <span class="hljs-attr">"version"</span> : <span class="hljs-string">"v1"</span>,
+  <span class="hljs-attr">"timestamp"</span> : <span class="hljs-string">"2013-08-31T00:00:00.000-07:00"</span>,
+  <span class="hljs-attr">"event"</span> : {
+    <span class="hljs-attr">"count"</span> : <span class="hljs-number">1</span>,
+    <span class="hljs-attr">"language"</span> : <span class="hljs-string">"en"</span>
+  }
+}, {
+  <span class="hljs-attr">"version"</span> : <span class="hljs-string">"v1"</span>,
+  <span class="hljs-attr">"timestamp"</span> : <span class="hljs-string">"2013-09-02T00:00:00.000-07:00"</span>,
+  <span class="hljs-attr">"event"</span> : {
+    <span class="hljs-attr">"count"</span> : <span class="hljs-number">2</span>,
+    <span class="hljs-attr">"language"</span> : <span class="hljs-string">"en"</span>
+  }
+} ]
+</code></pre>
+<p>Note that the timestamp for each bucket has been converted to Pacific time. Row <code>{&quot;timestamp&quot;: &quot;2013-09-02T23:32:45Z&quot;, &quot;page&quot;: &quot;CCC&quot;, &quot;language&quot; : &quot;en&quot;}</code> and
+<code>{&quot;timestamp&quot;: &quot;2013-09-03T03:32:45Z&quot;, &quot;page&quot;: &quot;DDD&quot;, &quot;language&quot; : &quot;en&quot;}</code> are put in the same bucket because they are in the same day in Pacific time.</p>
+<p>Also note that the <code>intervals</code> in groupBy query will not be converted to the timezone specified, the timezone specified in granularity is only applied on the
+query results.</p>
+<p>If you set the origin for the granularity to <code>1970-01-01T20:30:00-08:00</code>,</p>
+<pre><code class="hljs css language-javascript">   <span class="hljs-string">"granularity"</span>:{<span class="hljs-string">"type"</span>: <span class="hljs-string">"period"</span>, <span class="hljs-string">"period"</span>: <span class="hljs-string">"P1D"</span>, <span class="hljs-string">"timeZone"</span>: <span class="hljs-string">"America/Los_Angeles"</span>, <span class="hljs-string">"origin"</span>: <span class="hljs-string">"1970-01-01T20:30:00-08:00"</span>}
+</code></pre>
+<p>you will get</p>
+<pre><code class="hljs css language-json">[ {
+  <span class="hljs-attr">"version"</span> : <span class="hljs-string">"v1"</span>,
+  <span class="hljs-attr">"timestamp"</span> : <span class="hljs-string">"2013-08-29T20:30:00.000-07:00"</span>,
+  <span class="hljs-attr">"event"</span> : {
+    <span class="hljs-attr">"count"</span> : <span class="hljs-number">1</span>,
+    <span class="hljs-attr">"language"</span> : <span class="hljs-string">"en"</span>
+  }
+}, {
+  <span class="hljs-attr">"version"</span> : <span class="hljs-string">"v1"</span>,
+  <span class="hljs-attr">"timestamp"</span> : <span class="hljs-string">"2013-08-30T20:30:00.000-07:00"</span>,
+  <span class="hljs-attr">"event"</span> : {
+    <span class="hljs-attr">"count"</span> : <span class="hljs-number">1</span>,
+    <span class="hljs-attr">"language"</span> : <span class="hljs-string">"en"</span>
+  }
+}, {
+  <span class="hljs-attr">"version"</span> : <span class="hljs-string">"v1"</span>,
+  <span class="hljs-attr">"timestamp"</span> : <span class="hljs-string">"2013-09-01T20:30:00.000-07:00"</span>,
+  <span class="hljs-attr">"event"</span> : {
+    <span class="hljs-attr">"count"</span> : <span class="hljs-number">1</span>,
+    <span class="hljs-attr">"language"</span> : <span class="hljs-string">"en"</span>
+  }
+}, {
+  <span class="hljs-attr">"version"</span> : <span class="hljs-string">"v1"</span>,
+  <span class="hljs-attr">"timestamp"</span> : <span class="hljs-string">"2013-09-02T20:30:00.000-07:00"</span>,
+  <span class="hljs-attr">"event"</span> : {
+    <span class="hljs-attr">"count"</span> : <span class="hljs-number">1</span>,
+    <span class="hljs-attr">"language"</span> : <span class="hljs-string">"en"</span>
+  }
+} ]
+</code></pre>
+<p>Note that the <code>origin</code> you specified has nothing to do with the timezone, it only serves as a starting point for locating the very first granularity bucket.
+In this case, Row <code>{&quot;timestamp&quot;: &quot;2013-09-02T23:32:45Z&quot;, &quot;page&quot;: &quot;CCC&quot;, &quot;language&quot; : &quot;en&quot;}</code> and <code>{&quot;timestamp&quot;: &quot;2013-09-03T03:32:45Z&quot;, &quot;page&quot;: &quot;DDD&quot;, &quot;language&quot; : &quot;en&quot;}</code>
+are not in the same bucket.</p>
+<h4><a class="anchor" aria-hidden="true" id="supported-time-zones"></a><a href="#supported-time-zones" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Supported Time Zones</h4>
+<p>Timezone support is provided by the <a href="http://www.joda.org">Joda Time library</a>, which uses the standard IANA time zones. See the <a href="http://joda-time.sourceforge.net/timezones.html">Joda Time supported timezones</a>.</p>
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+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>GroupBy queries · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/0.20.0/querying/groupbyquery.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.20.0" /><meta property="og:title" content="GroupBy queries · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
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+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
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+<blockquote>
+<p>Apache Druid supports two query languages: <a href="/docs/0.20.0/querying/sql.html">Druid SQL</a> and <a href="/docs/0.20.0/querying/querying.html">native queries</a>.
+This document describes a query
+type in the native language. For information about when Druid SQL will use this query type, refer to the
+<a href="/docs/0.20.0/querying/sql.html#query-types">SQL documentation</a>.</p>
+</blockquote>
+<p>These types of Apache Druid queries take a groupBy query object and return an array of JSON objects where each object represents a
+grouping asked for by the query.</p>
+<blockquote>
+<p>Note: If you are doing aggregations with time as your only grouping, or an ordered groupBy over a single dimension,
+consider <a href="/docs/0.20.0/querying/timeseriesquery.html">Timeseries</a> and <a href="/docs/0.20.0/querying/topnquery.html">TopN</a> queries as well as
+groupBy. Their performance may be better in some cases. See <a href="#alternatives">Alternatives</a> below for more details.</p>
+</blockquote>
+<p>An example groupBy query object is shown below:</p>
+<pre><code class="hljs css language-json">{
+  <span class="hljs-attr">"queryType"</span>: <span class="hljs-string">"groupBy"</span>,
+  <span class="hljs-attr">"dataSource"</span>: <span class="hljs-string">"sample_datasource"</span>,
+  <span class="hljs-attr">"granularity"</span>: <span class="hljs-string">"day"</span>,
+  <span class="hljs-attr">"dimensions"</span>: [<span class="hljs-string">"country"</span>, <span class="hljs-string">"device"</span>],
+  <span class="hljs-attr">"limitSpec"</span>: { <span class="hljs-attr">"type"</span>: <span class="hljs-string">"default"</span>, <span class="hljs-attr">"limit"</span>: <span class="hljs-number">5000</span>, <span class="hljs-attr">"columns"</span>: [<span class="hljs-string">"country"</span>, <span class="hljs-string">"data_transfer"</span>] },
+  <span class="hljs-attr">"filter"</span>: {
+    <span class="hljs-attr">"type"</span>: <span class="hljs-string">"and"</span>,
+    <span class="hljs-attr">"fields"</span>: [
+      { <span class="hljs-attr">"type"</span>: <span class="hljs-string">"selector"</span>, <span class="hljs-attr">"dimension"</span>: <span class="hljs-string">"carrier"</span>, <span class="hljs-attr">"value"</span>: <span class="hljs-string">"AT&amp;T"</span> },
+      { <span class="hljs-attr">"type"</span>: <span class="hljs-string">"or"</span>,
+        <span class="hljs-attr">"fields"</span>: [
+          { <span class="hljs-attr">"type"</span>: <span class="hljs-string">"selector"</span>, <span class="hljs-attr">"dimension"</span>: <span class="hljs-string">"make"</span>, <span class="hljs-attr">"value"</span>: <span class="hljs-string">"Apple"</span> },
+          { <span class="hljs-attr">"type"</span>: <span class="hljs-string">"selector"</span>, <span class="hljs-attr">"dimension"</span>: <span class="hljs-string">"make"</span>, <span class="hljs-attr">"value"</span>: <span class="hljs-string">"Samsung"</span> }
+        ]
+      }
+    ]
+  },
+  <span class="hljs-attr">"aggregations"</span>: [
+    { <span class="hljs-attr">"type"</span>: <span class="hljs-string">"longSum"</span>, <span class="hljs-attr">"name"</span>: <span class="hljs-string">"total_usage"</span>, <span class="hljs-attr">"fieldName"</span>: <span class="hljs-string">"user_count"</span> },
+    { <span class="hljs-attr">"type"</span>: <span class="hljs-string">"doubleSum"</span>, <span class="hljs-attr">"name"</span>: <span class="hljs-string">"data_transfer"</span>, <span class="hljs-attr">"fieldName"</span>: <span class="hljs-string">"data_transfer"</span> }
+  ],
+  <span class="hljs-attr">"postAggregations"</span>: [
+    { <span class="hljs-attr">"type"</span>: <span class="hljs-string">"arithmetic"</span>,
+      <span class="hljs-attr">"name"</span>: <span class="hljs-string">"avg_usage"</span>,
+      <span class="hljs-attr">"fn"</span>: <span class="hljs-string">"/"</span>,
+      <span class="hljs-attr">"fields"</span>: [
+        { <span class="hljs-attr">"type"</span>: <span class="hljs-string">"fieldAccess"</span>, <span class="hljs-attr">"fieldName"</span>: <span class="hljs-string">"data_transfer"</span> },
+        { <span class="hljs-attr">"type"</span>: <span class="hljs-string">"fieldAccess"</span>, <span class="hljs-attr">"fieldName"</span>: <span class="hljs-string">"total_usage"</span> }
+      ]
+    }
+  ],
+  <span class="hljs-attr">"intervals"</span>: [ <span class="hljs-string">"2012-01-01T00:00:00.000/2012-01-03T00:00:00.000"</span> ],
+  <span class="hljs-attr">"having"</span>: {
+    <span class="hljs-attr">"type"</span>: <span class="hljs-string">"greaterThan"</span>,
+    <span class="hljs-attr">"aggregation"</span>: <span class="hljs-string">"total_usage"</span>,
+    <span class="hljs-attr">"value"</span>: <span class="hljs-number">100</span>
+  }
+}
+</code></pre>
+<p>Following are main parts to a groupBy query:</p>
+<table>
+<thead>
+<tr><th>property</th><th>description</th><th>required?</th></tr>
+</thead>
+<tbody>
+<tr><td>queryType</td><td>This String should always be &quot;groupBy&quot;; this is the first thing Druid looks at to figure out how to interpret the query</td><td>yes</td></tr>
+<tr><td>dataSource</td><td>A String or Object defining the data source to query, very similar to a table in a relational database. See <a href="/docs/0.20.0/querying/datasource.html">DataSource</a> for more information.</td><td>yes</td></tr>
+<tr><td>dimensions</td><td>A JSON list of dimensions to do the groupBy over; or see <a href="/docs/0.20.0/querying/dimensionspecs.html">DimensionSpec</a> for ways to extract dimensions.</td><td>yes</td></tr>
+<tr><td>limitSpec</td><td>See <a href="/docs/0.20.0/querying/limitspec.html">LimitSpec</a>.</td><td>no</td></tr>
+<tr><td>having</td><td>See <a href="/docs/0.20.0/querying/having.html">Having</a>.</td><td>no</td></tr>
+<tr><td>granularity</td><td>Defines the granularity of the query. See <a href="/docs/0.20.0/querying/granularities.html">Granularities</a></td><td>yes</td></tr>
+<tr><td>filter</td><td>See <a href="/docs/0.20.0/querying/filters.html">Filters</a></td><td>no</td></tr>
+<tr><td>aggregations</td><td>See <a href="/docs/0.20.0/querying/aggregations.html">Aggregations</a></td><td>no</td></tr>
+<tr><td>postAggregations</td><td>See <a href="/docs/0.20.0/querying/post-aggregations.html">Post Aggregations</a></td><td>no</td></tr>
+<tr><td>intervals</td><td>A JSON Object representing ISO-8601 Intervals. This defines the time ranges to run the query over.</td><td>yes</td></tr>
+<tr><td>subtotalsSpec</td><td>A JSON array of arrays to return additional result sets for groupings of subsets of top level <code>dimensions</code>. It is <a href="groupbyquery.html#more-on-subtotalsspec">described later</a> in more detail.</td><td>no</td></tr>
+<tr><td>context</td><td>An additional JSON Object which can be used to specify certain flags.</td><td>no</td></tr>
+</tbody>
+</table>
+<p>To pull it all together, the above query would return <em>n*m</em> data points, up to a maximum of 5000 points, where n is the cardinality of the <code>country</code> dimension, m is the cardinality of the <code>device</code> dimension, each day between 2012-01-01 and 2012-01-03, from the <code>sample_datasource</code> table. Each data point contains the (long) sum of <code>total_usage</code> if the value of the data point is greater than 100, the (double) sum of <code>data_transfer</code> and the (double) result of <code>total_usage</code> divided by <code>data_transfer</code> for the filter set for a particular grouping of <code>country</code> and <code>device</code>. The output looks like this:</p>
+<pre><code class="hljs css language-json">[
+  {
+    <span class="hljs-attr">"version"</span> : <span class="hljs-string">"v1"</span>,
+    <span class="hljs-attr">"timestamp"</span> : <span class="hljs-string">"2012-01-01T00:00:00.000Z"</span>,
+    <span class="hljs-attr">"event"</span> : {
+      <span class="hljs-attr">"country"</span> : &lt;some_dim_value_one&gt;,
+      <span class="hljs-attr">"device"</span> : &lt;some_dim_value_two&gt;,
+      <span class="hljs-attr">"total_usage"</span> : &lt;some_value_one&gt;,
+      <span class="hljs-attr">"data_transfer"</span> :&lt;some_value_two&gt;,
+      <span class="hljs-attr">"avg_usage"</span> : &lt;some_avg_usage_value&gt;
+    }
+  },
+  {
+    <span class="hljs-attr">"version"</span> : <span class="hljs-string">"v1"</span>,
+    <span class="hljs-attr">"timestamp"</span> : <span class="hljs-string">"2012-01-01T00:00:12.000Z"</span>,
+    <span class="hljs-attr">"event"</span> : {
+      <span class="hljs-attr">"dim1"</span> : &lt;some_other_dim_value_one&gt;,
+      <span class="hljs-attr">"dim2"</span> : &lt;some_other_dim_value_two&gt;,
+      <span class="hljs-attr">"sample_name1"</span> : &lt;some_other_value_one&gt;,
+      <span class="hljs-attr">"sample_name2"</span> :&lt;some_other_value_two&gt;,
+      <span class="hljs-attr">"avg_usage"</span> : &lt;some_other_avg_usage_value&gt;
+    }
+  },
+...
+]
+</code></pre>
+<h2><a class="anchor" aria-hidden="true" id="behavior-on-multi-value-dimensions"></a><a href="#behavior-on-multi-value-dimensions" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Behavior on multi-value dimensions</h2>
+<p>groupBy queries can group on multi-value dimensions. When grouping on a multi-value dimension, <em>all</em> values
+from matching rows will be used to generate one group per value. It's possible for a query to return more groups than
+there are rows. For example, a groupBy on the dimension <code>tags</code> with filter <code>&quot;t1&quot; AND &quot;t3&quot;</code> would match only row1, and
+generate a result with three groups: <code>t1</code>, <code>t2</code>, and <code>t3</code>. If you only need to include values that match
+your filter, you can use a <a href="dimensionspecs.html#filtered-dimensionspecs">filtered dimensionSpec</a>. This can also
+improve performance.</p>
+<p>See <a href="multi-value-dimensions.html">Multi-value dimensions</a> for more details.</p>
+<h2><a class="anchor" aria-hidden="true" id="more-on-subtotalsspec"></a><a href="#more-on-subtotalsspec" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>More on subtotalsSpec</h2>
+<p>The subtotals feature allows computation of multiple sub-groupings in a single query. To use this feature, add a &quot;subtotalsSpec&quot; to your query as a list of subgroup dimension sets. It should contain the <code>outputName</code> from dimensions in your <code>dimensions</code> attribute, in the same order as they appear in the <code>dimensions</code> attribute (although, of course, you may skip some).</p>
+<p>For example, consider a groupBy query like this one:</p>
+<pre><code class="hljs css language-json">{
+"type": "groupBy",
+ ...
+ ...
+"dimensions": [
+  {
+  "type" : "default",
+  "dimension" : "d1col",
+  "outputName": "D1"
+  },
+  {
+  "type" : "extraction",
+  "dimension" : "d2col",
+  "outputName" :  "D2",
+  "extractionFn" : extraction_func
+  },
+  {
+  "type":"lookup",
+  "dimension":"d3col",
+  "outputName":"D3",
+  "name":"my_lookup"
+  }
+],
+...
+...
+"subtotalsSpec":[ ["D1", "D2", D3"], ["D1", "D3"], ["D3"]],
+..
+
+}
+</code></pre>
+<p>The result of the subtotalsSpec would be equivalent to concatenating the result of three groupBy queries, with the &quot;dimensions&quot; field being <code>[&quot;D1&quot;, &quot;D2&quot;, D3&quot;]</code>, <code>[&quot;D1&quot;, &quot;D3&quot;]</code> and <code>[&quot;D3&quot;]</code>, given the <code>DimensionSpec</code> shown above.
+The response for the query above would look something like:</p>
+<pre><code class="hljs css language-json">[
+  {
+    <span class="hljs-attr">"version"</span> : <span class="hljs-string">"v1"</span>,
+    <span class="hljs-attr">"timestamp"</span> : <span class="hljs-string">"t1"</span>,
+    <span class="hljs-attr">"event"</span> : { <span class="hljs-attr">"D1"</span>: <span class="hljs-string">".."</span>, <span class="hljs-attr">"D2"</span>: <span class="hljs-string">".."</span>, <span class="hljs-attr">"D3"</span>: <span class="hljs-string">".."</span> }
+    }
+  },
+    {
+    <span class="hljs-attr">"version"</span> : <span class="hljs-string">"v1"</span>,
+    <span class="hljs-attr">"timestamp"</span> : <span class="hljs-string">"t2"</span>,
+    <span class="hljs-attr">"event"</span> : { <span class="hljs-attr">"D1"</span>: <span class="hljs-string">".."</span>, <span class="hljs-attr">"D2"</span>: <span class="hljs-string">".."</span>, <span class="hljs-attr">"D3"</span>: <span class="hljs-string">".."</span> }
+    }
+  },
+  ...
+  ...
+
+   {
+    <span class="hljs-attr">"version"</span> : <span class="hljs-string">"v1"</span>,
+    <span class="hljs-attr">"timestamp"</span> : <span class="hljs-string">"t1"</span>,
+    <span class="hljs-attr">"event"</span> : { <span class="hljs-attr">"D1"</span>: <span class="hljs-string">".."</span>, <span class="hljs-attr">"D2"</span>: <span class="hljs-literal">null</span>, <span class="hljs-attr">"D3"</span>: <span class="hljs-string">".."</span> }
+    }
+  },
+    {
+    <span class="hljs-attr">"version"</span> : <span class="hljs-string">"v1"</span>,
+    <span class="hljs-attr">"timestamp"</span> : <span class="hljs-string">"t2"</span>,
+    <span class="hljs-attr">"event"</span> : { <span class="hljs-attr">"D1"</span>: <span class="hljs-string">".."</span>, <span class="hljs-attr">"D2"</span>: <span class="hljs-literal">null</span>, <span class="hljs-attr">"D3"</span>: <span class="hljs-string">".."</span> }
+    }
+  },
+  ...
+  ...
+
+  {
+    <span class="hljs-attr">"version"</span> : <span class="hljs-string">"v1"</span>,
+    <span class="hljs-attr">"timestamp"</span> : <span class="hljs-string">"t1"</span>,
+    <span class="hljs-attr">"event"</span> : { <span class="hljs-attr">"D1"</span>: <span class="hljs-literal">null</span>, <span class="hljs-attr">"D2"</span>: <span class="hljs-literal">null</span>, <span class="hljs-attr">"D3"</span>: <span class="hljs-string">".."</span> }
+    }
+  },
+    {
+    <span class="hljs-attr">"version"</span> : <span class="hljs-string">"v1"</span>,
+    <span class="hljs-attr">"timestamp"</span> : <span class="hljs-string">"t2"</span>,
+    <span class="hljs-attr">"event"</span> : { <span class="hljs-attr">"D1"</span>: <span class="hljs-literal">null</span>, <span class="hljs-attr">"D2"</span>: <span class="hljs-literal">null</span>, <span class="hljs-attr">"D3"</span>: <span class="hljs-string">".."</span> }
+    }
+  },
+...
+]
+</code></pre>
+<blockquote>
+<p>Notice that dimensions that are not included in an individual subtotalsSpec grouping are returned with a <code>null</code> value. This response format represents a behavior change as of Apache Druid 0.18.0. In release 0.17.0 and earlier, such dimensions were entirely excluded from the result.</p>
+</blockquote>
+<h2><a class="anchor" aria-hidden="true" id="implementation-details"></a><a href="#implementation-details" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Implementation details</h2>
+<h3><a class="anchor" aria-hidden="true" id="strategies"></a><a href="#strategies" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Strategies</h3>
+<p>GroupBy queries can be executed using two different strategies. The default strategy for a cluster is determined by the
+&quot;druid.query.groupBy.defaultStrategy&quot; runtime property on the Broker. This can be overridden using &quot;groupByStrategy&quot; in
+the query context. If neither the context field nor the property is set, the &quot;v2&quot; strategy will be used.</p>
+<ul>
+<li><p>&quot;v2&quot;, the default, is designed to offer better performance and memory management. This strategy generates
+per-segment results using a fully off-heap map. Data processes merge the per-segment results using a fully off-heap
+concurrent facts map combined with an on-heap string dictionary. This may optionally involve spilling to disk. Data
+processes return sorted results to the Broker, which merges result streams using an N-way merge. The broker materializes
+the results if necessary (e.g. if the query sorts on columns other than its dimensions). Otherwise, it streams results
+back as they are merged.</p></li>
+<li><p>&quot;v1&quot;, a legacy engine, generates per-segment results on data processes (Historical, realtime, MiddleManager) using a map which
+is partially on-heap (dimension keys and the map itself) and partially off-heap (the aggregated values). Data processes then
+merge the per-segment results using Druid's indexing mechanism. This merging is multi-threaded by default, but can
+optionally be single-threaded. The Broker merges the final result set using Druid's indexing mechanism again. The broker
+merging is always single-threaded. Because the Broker merges results using the indexing mechanism, it must materialize
+the full result set before returning any results. On both the data processes and the Broker, the merging index is fully
+on-heap by default, but it can optionally store aggregated values off-heap.</p></li>
+</ul>
+<h3><a class="anchor" aria-hidden="true" id="differences-between-v1-and-v2"></a><a href="#differences-between-v1-and-v2" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Differences between v1 and v2</h3>
+<p>Query API and results are compatible between the two engines; however, there are some differences from a cluster
+configuration perspective:</p>
+<ul>
+<li>groupBy v1 controls resource usage using a row-based limit (maxResults) whereas groupBy v2 uses bytes-based limits.
+In addition, groupBy v1 merges results on-heap, whereas groupBy v2 merges results off-heap. These factors mean that
+memory tuning and resource limits behave differently between v1 and v2. In particular, due to this, some queries
+that can complete successfully in one engine may exceed resource limits and fail with the other engine. See the
+&quot;Memory tuning and resource limits&quot; section for more details.</li>
+<li>groupBy v1 imposes no limit on the number of concurrently running queries, whereas groupBy v2 controls memory usage
+by using a finite-sized merge buffer pool. By default, the number of merge buffers is 1/4 the number of processing
+threads. You can adjust this as necessary to balance concurrency and memory usage.</li>
+<li>groupBy v1 supports caching on either the Broker or Historical processes, whereas groupBy v2 only supports caching on
+Historical processes.</li>
+<li>groupBy v2 supports both array-based aggregation and hash-based aggregation. The array-based aggregation is used only
+when the grouping key is a single indexed string column. In array-based aggregation, the dictionary-encoded value is used
+as the index, so the aggregated values in the array can be accessed directly without finding buckets based on hashing.</li>
+</ul>
+<h3><a class="anchor" aria-hidden="true" id="memory-tuning-and-resource-limits"></a><a href="#memory-tuning-and-resource-limits" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Memory tuning and resource limits</h3>
+<p>When using groupBy v2, three parameters control resource usage and limits:</p>
+<ul>
+<li><code>druid.processing.buffer.sizeBytes</code>: size of the off-heap hash table used for aggregation, per query, in bytes. At
+most <code>druid.processing.numMergeBuffers</code> of these will be created at once, which also serves as an upper limit on the
+number of concurrently running groupBy queries.</li>
+<li><code>druid.query.groupBy.maxMergingDictionarySize</code>: size of the on-heap dictionary used when grouping on strings, per query,
+in bytes. Note that this is based on a rough estimate of the dictionary size, not the actual size.</li>
+<li><code>druid.query.groupBy.maxOnDiskStorage</code>: amount of space on disk used for aggregation, per query, in bytes. By default,
+this is 0, which means aggregation will not use disk.</li>
+</ul>
+<p>If <code>maxOnDiskStorage</code> is 0 (the default) then a query that exceeds either the on-heap dictionary limit, or the off-heap
+aggregation table limit, will fail with a &quot;Resource limit exceeded&quot; error describing the limit that was exceeded.</p>
+<p>If <code>maxOnDiskStorage</code> is greater than 0, queries that exceed the in-memory limits will start using disk for aggregation.
+In this case, when either the on-heap dictionary or off-heap hash table fills up, partially aggregated records will be
+sorted and flushed to disk. Then, both in-memory structures will be cleared out for further aggregation. Queries that
+then go on to exceed <code>maxOnDiskStorage</code> will fail with a &quot;Resource limit exceeded&quot; error indicating that they ran out of
+disk space.</p>
+<p>With groupBy v2, cluster operators should make sure that the off-heap hash tables and on-heap merging dictionaries
+will not exceed available memory for the maximum possible concurrent query load (given by
+<code>druid.processing.numMergeBuffers</code>). See the <a href="/docs/0.20.0/operations/basic-cluster-tuning.html">basic cluster tuning guide</a>
+for more details about direct memory usage, organized by Druid process type.</p>
+<p>Brokers do not need merge buffers for basic groupBy queries. Queries with subqueries (using a <code>query</code> dataSource) require one merge buffer if there is a single subquery, or two merge buffers if there is more than one layer of nested subqueries. Queries with <a href="groupbyquery.html#more-on-subtotalsspec">subtotals</a> need one merge buffer. These can stack on top of each other: a groupBy query with multiple layers of nested subqueries, and that also uses subtotals, will need three merge buffers.</p>
+<p>Historicals and ingestion tasks need one merge buffer for each groupBy query, unless <a href="groupbyquery.html#parallel-combine">parallel combination</a> is enabled, in which case they need two merge buffers per query.</p>
+<p>When using groupBy v1, all aggregation is done on-heap, and resource limits are done through the parameter
+<code>druid.query.groupBy.maxResults</code>. This is a cap on the maximum number of results in a result set. Queries that exceed
+this limit will fail with a &quot;Resource limit exceeded&quot; error indicating they exceeded their row limit. Cluster
+operators should make sure that the on-heap aggregations will not exceed available JVM heap space for the expected
+concurrent query load.</p>
+<h3><a class="anchor" aria-hidden="true" id="performance-tuning-for-groupby-v2"></a><a href="#performance-tuning-for-groupby-v2" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Performance tuning for groupBy v2</h3>
+<h4><a class="anchor" aria-hidden="true" id="limit-pushdown-optimization"></a><a href="#limit-pushdown-optimization" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Limit pushdown optimization</h4>
+<p>Druid pushes down the <code>limit</code> spec in groupBy queries to the segments on Historicals wherever possible to early prune unnecessary intermediate results and minimize the amount of data transferred to Brokers. By default, this technique is applied only when all fields in the <code>orderBy</code> spec is a subset of the grouping keys. This is because the <code>limitPushDown</code> doesn't guarantee the exact results if the <code>orderBy</code> spec includes any fields that are not in the grouping keys. However, you can enable this technique even in such cases if you can sacrifice some accuracy for fast query processing like in topN queries. See <code>forceLimitPushDown</code> in <a href="#groupby-v2-configurations">advanced groupBy v2 configurations</a>.</p>
+<h4><a class="anchor" aria-hidden="true" id="optimizing-hash-table"></a><a href="#optimizing-hash-table" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Optimizing hash table</h4>
+<p>The groupBy v2 engine uses an open addressing hash table for aggregation. The hash table is initialized with a given initial bucket number and gradually grows on buffer full. On hash collisions, the linear probing technique is used.</p>
+<p>The default number of initial buckets is 1024 and the default max load factor of the hash table is 0.7. If you can see too many collisions in the hash table, you can adjust these numbers. See <code>bufferGrouperInitialBuckets</code> and <code>bufferGrouperMaxLoadFactor</code> in <a href="#groupby-v2-configurations">Advanced groupBy v2 configurations</a>.</p>
+<h4><a class="anchor" aria-hidden="true" id="parallel-combine"></a><a href="#parallel-combine" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Parallel combine</h4>
+<p>Once a Historical finishes aggregation using the hash table, it sorts the aggregated results and merges them before sending to the
+Broker for N-way merge aggregation in the broker. By default, Historicals use all their available processing threads
+(configured by <code>druid.processing.numThreads</code>) for aggregation, but use a single thread for sorting and merging
+aggregates which is an http thread to send data to Brokers.</p>
+<p>This is to prevent some heavy groupBy queries from blocking other queries. In Druid, the processing threads are shared
+between all submitted queries and they are <em>not interruptible</em>. It means, if a heavy query takes all available
+processing threads, all other queries might be blocked until the heavy query is finished. GroupBy queries usually take
+longer time than timeseries or topN queries, they should release processing threads as soon as possible.</p>
+<p>However, you might care about the performance of some really heavy groupBy queries. Usually, the performance bottleneck
+of heavy groupBy queries is merging sorted aggregates. In such cases, you can use processing threads for it as well.
+This is called <em>parallel combine</em>. To enable parallel combine, see <code>numParallelCombineThreads</code> in
+<a href="#groupby-v2-configurations">Advanced groupBy v2 configurations</a>. Note that parallel combine can be enabled only when
+data is actually spilled (see <a href="#memory-tuning-and-resource-limits">Memory tuning and resource limits</a>).</p>
+<p>Once parallel combine is enabled, the groupBy v2 engine can create a combining tree for merging sorted aggregates. Each
+intermediate node of the tree is a thread merging aggregates from the child nodes. The leaf node threads read and merge
+aggregates from hash tables including spilled ones. Usually, leaf processes are slower than intermediate nodes because they
+need to read data from disk. As a result, less threads are used for intermediate nodes by default. You can change the
+degree of intermediate nodes. See <code>intermediateCombineDegree</code> in <a href="#groupby-v2-configurations">Advanced groupBy v2 configurations</a>.</p>
+<p>Please note that each Historical needs two merge buffers to process a groupBy v2 query with parallel combine: one for
+computing intermediate aggregates from each segment and another for combining intermediate aggregates in parallel.</p>
+<h3><a class="anchor" aria-hidden="true" id="alternatives"></a><a href="#alternatives" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Alternatives</h3>
+<p>There are some situations where other query types may be a better choice than groupBy.</p>
+<ul>
+<li><p>For queries with no &quot;dimensions&quot; (i.e. grouping by time only) the <a href="timeseriesquery.html">Timeseries query</a> will
+generally be faster than groupBy. The major differences are that it is implemented in a fully streaming manner (taking
+advantage of the fact that segments are already sorted on time) and does not need to use a hash table for merging.</p></li>
+<li><p>For queries with a single &quot;dimensions&quot; element (i.e. grouping by one string dimension), the <a href="topnquery.html">TopN query</a>
+will sometimes be faster than groupBy. This is especially true if you are ordering by a metric and find approximate
+results acceptable.</p></li>
+</ul>
+<h3><a class="anchor" aria-hidden="true" id="nested-groupbys"></a><a href="#nested-groupbys" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Nested groupBys</h3>
+<p>Nested groupBys (dataSource of type &quot;query&quot;) are performed differently for &quot;v1&quot; and &quot;v2&quot;. The Broker first runs the
+inner groupBy query in the usual way. &quot;v1&quot; strategy then materializes the inner query's results on-heap with Druid's
+indexing mechanism, and runs the outer query on these materialized results. &quot;v2&quot; strategy runs the outer query on the
+inner query's results stream with off-heap fact map and on-heap string dictionary that can spill to disk. Both
+strategy perform the outer query on the Broker in a single-threaded fashion.</p>
+<h3><a class="anchor" aria-hidden="true" id="configurations"></a><a href="#configurations" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Configurations</h3>
+<p>This section describes the configurations for groupBy queries. You can set the runtime properties in the <code>runtime.properties</code> file on Broker, Historical, and MiddleManager processes. You can set the query context parameters through the <a href="query-context.html">query context</a>.</p>
+<h4><a class="anchor" aria-hidden="true" id="configurations-for-groupby-v2"></a><a href="#configurations-for-groupby-v2" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Configurations for groupBy v2</h4>
+<p>Supported runtime properties:</p>
+<table>
+<thead>
+<tr><th>Property</th><th>Description</th><th>Default</th></tr>
+</thead>
+<tbody>
+<tr><td><code>druid.query.groupBy.maxMergingDictionarySize</code></td><td>Maximum amount of heap space (approximately) to use for the string dictionary during merging. When the dictionary exceeds this size, a spill to disk will be triggered.</td><td>100000000</td></tr>
+<tr><td><code>druid.query.groupBy.maxOnDiskStorage</code></td><td>Maximum amount of disk space to use, per-query, for spilling result sets to disk when either the merging buffer or the dictionary fills up. Queries that exceed this limit will fail. Set to zero to disable disk spilling.</td><td>0 (disabled)</td></tr>
+</tbody>
+</table>
+<p>Supported query contexts:</p>
+<table>
+<thead>
+<tr><th>Key</th><th>Description</th></tr>
+</thead>
+<tbody>
+<tr><td><code>maxMergingDictionarySize</code></td><td>Can be used to lower the value of <code>druid.query.groupBy.maxMergingDictionarySize</code> for this query.</td></tr>
+<tr><td><code>maxOnDiskStorage</code></td><td>Can be used to lower the value of <code>druid.query.groupBy.maxOnDiskStorage</code> for this query.</td></tr>
+</tbody>
+</table>
+<h3><a class="anchor" aria-hidden="true" id="advanced-configurations"></a><a href="#advanced-configurations" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Advanced configurations</h3>
+<h4><a class="anchor" aria-hidden="true" id="common-configurations-for-all-groupby-strategies"></a><a href="#common-configurations-for-all-groupby-strategies" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Common configurations for all groupBy strategies</h4>
+<p>Supported runtime properties:</p>
+<table>
+<thead>
+<tr><th>Property</th><th>Description</th><th>Default</th></tr>
+</thead>
+<tbody>
+<tr><td><code>druid.query.groupBy.defaultStrategy</code></td><td>Default groupBy query strategy.</td><td>v2</td></tr>
+<tr><td><code>druid.query.groupBy.singleThreaded</code></td><td>Merge results using a single thread.</td><td>false</td></tr>
+</tbody>
+</table>
+<p>Supported query contexts:</p>
+<table>
+<thead>
+<tr><th>Key</th><th>Description</th></tr>
+</thead>
+<tbody>
+<tr><td><code>groupByStrategy</code></td><td>Overrides the value of <code>druid.query.groupBy.defaultStrategy</code> for this query.</td></tr>
+<tr><td><code>groupByIsSingleThreaded</code></td><td>Overrides the value of <code>druid.query.groupBy.singleThreaded</code> for this query.</td></tr>
+</tbody>
+</table>
+<h4><a class="anchor" aria-hidden="true" id="groupby-v2-configurations"></a><a href="#groupby-v2-configurations" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>GroupBy v2 configurations</h4>
+<p>Supported runtime properties:</p>
+<table>
+<thead>
+<tr><th>Property</th><th>Description</th><th>Default</th></tr>
+</thead>
+<tbody>
+<tr><td><code>druid.query.groupBy.bufferGrouperInitialBuckets</code></td><td>Initial number of buckets in the off-heap hash table used for grouping results. Set to 0 to use a reasonable default (1024).</td><td>0</td></tr>
+<tr><td><code>druid.query.groupBy.bufferGrouperMaxLoadFactor</code></td><td>Maximum load factor of the off-heap hash table used for grouping results. When the load factor exceeds this size, the table will be grown or spilled to disk. Set to 0 to use a reasonable default (0.7).</td><td>0</td></tr>
+<tr><td><code>druid.query.groupBy.forceHashAggregation</code></td><td>Force to use hash-based aggregation.</td><td>false</td></tr>
+<tr><td><code>druid.query.groupBy.intermediateCombineDegree</code></td><td>Number of intermediate nodes combined together in the combining tree. Higher degrees will need less threads which might be helpful to improve the query performance by reducing the overhead of too many threads if the server has sufficiently powerful cpu cores.</td><td>8</td></tr>
+<tr><td><code>druid.query.groupBy.numParallelCombineThreads</code></td><td>Hint for the number of parallel combining threads. This should be larger than 1 to turn on the parallel combining feature. The actual number of threads used for parallel combining is min(<code>druid.query.groupBy.numParallelCombineThreads</code>, <code>druid.processing.numThreads</code>).</td><td>1 (disabled)</td></tr>
+<tr><td><code>druid.query.groupBy.applyLimitPushDownToSegment</code></td><td>If Broker pushes limit down to queryable data server (historicals, peons) then limit results during segment scan. If typically there are a large number of segments taking part in a query on a data server, this setting may counterintuitively reduce performance if enabled.</td><td>false (disabled)</td></tr>
+</tbody>
+</table>
+<p>Supported query contexts:</p>
+<table>
+<thead>
+<tr><th>Key</th><th>Description</th><th>Default</th></tr>
+</thead>
+<tbody>
+<tr><td><code>bufferGrouperInitialBuckets</code></td><td>Overrides the value of <code>druid.query.groupBy.bufferGrouperInitialBuckets</code> for this query.</td><td>None</td></tr>
+<tr><td><code>bufferGrouperMaxLoadFactor</code></td><td>Overrides the value of <code>druid.query.groupBy.bufferGrouperMaxLoadFactor</code> for this query.</td><td>None</td></tr>
+<tr><td><code>forceHashAggregation</code></td><td>Overrides the value of <code>druid.query.groupBy.forceHashAggregation</code></td><td>None</td></tr>
+<tr><td><code>intermediateCombineDegree</code></td><td>Overrides the value of <code>druid.query.groupBy.intermediateCombineDegree</code></td><td>None</td></tr>
+<tr><td><code>numParallelCombineThreads</code></td><td>Overrides the value of <code>druid.query.groupBy.numParallelCombineThreads</code></td><td>None</td></tr>
+<tr><td><code>sortByDimsFirst</code></td><td>Sort the results first by dimension values and then by timestamp.</td><td>false</td></tr>
+<tr><td><code>forceLimitPushDown</code></td><td>When all fields in the orderby are part of the grouping key, the Broker will push limit application down to the Historical processes. When the sorting order uses fields that are not in the grouping key, applying this optimization can result in approximate results with unknown accuracy, so this optimization is disabled by default in that case. Enabling this context flag turns on limit push down for limit/orderbys that contain non-grouping key columns.</td><td>false</td></tr>
+<tr><td><code>applyLimitPushDownToSegment</code></td><td>If Broker pushes limit down to queryable nodes (historicals, peons) then limit results during segment scan. This context value can be used to override <code>druid.query.groupBy.applyLimitPushDownToSegment</code>.</td><td>true</td></tr>
+</tbody>
+</table>
+<h4><a class="anchor" aria-hidden="true" id="groupby-v1-configurations"></a><a href="#groupby-v1-configurations" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>GroupBy v1 configurations</h4>
+<p>Supported runtime properties:</p>
+<table>
+<thead>
+<tr><th>Property</th><th>Description</th><th>Default</th></tr>
+</thead>
+<tbody>
+<tr><td><code>druid.query.groupBy.maxIntermediateRows</code></td><td>Maximum number of intermediate rows for the per-segment grouping engine. This is a tuning parameter that does not impose a hard limit; rather, it potentially shifts merging work from the per-segment engine to the overall merging index. Queries that exceed this limit will not fail.</td><td>50000</td></tr>
+<tr><td><code>druid.query.groupBy.maxResults</code></td><td>Maximum number of results. Queries that exceed this limit will fail.</td><td>500000</td></tr>
+</tbody>
+</table>
+<p>Supported query contexts:</p>
+<table>
+<thead>
+<tr><th>Key</th><th>Description</th><th>Default</th></tr>
+</thead>
+<tbody>
+<tr><td><code>maxIntermediateRows</code></td><td>Can be used to lower the value of <code>druid.query.groupBy.maxIntermediateRows</code> for this query.</td><td>None</td></tr>
+<tr><td><code>maxResults</code></td><td>Can be used to lower the value of <code>druid.query.groupBy.maxResults</code> for this query.</td><td>None</td></tr>
+<tr><td><code>useOffheap</code></td><td>Set to true to store aggregations off-heap when merging results.</td><td>false</td></tr>
+</tbody>
+</table>
+<h4><a class="anchor" aria-hidden="true" id="array-based-result-rows"></a><a href="#array-based-result-rows" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Array based result rows</h4>
+<p>Internally Druid always uses an array based representation of groupBy result rows, but by default this is translated
+into a map based result format at the Broker. To reduce the overhead of this translation, results may also be returned
+from the Broker directly in the array based format if <code>resultAsArray</code> is set to <code>true</code> on the query context.</p>
+<p>Each row is positional, and has the following fields, in order:</p>
+<ul>
+<li>Timestamp (optional; only if granularity != ALL)</li>
+<li>Dimensions (in order)</li>
+<li>Aggregators (in order)</li>
+<li>Post-aggregators (optional; in order, if present)</li>
+</ul>
+<p>This schema is not available on the response, so it must be computed from the issued query in order to properly read
+the results.</p>
+</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/0.20.0/querying/topnquery.html"><span class="arrow-prev">← </span><span class="function-name-prevnext">TopN</span></a><a class="docs-next button" href="/docs/0.20.0/querying/scan-query.html"><span>Scan</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#behavior-on-multi-value-dimensions">Behavior on multi-value dimensions</a></li><li><a href="#more-on-subtotalsspec">More on subtotalsSpec</a></li><li><a href="#implementation-details">Implementation details</a><ul class="toc-headings"><li><a href="#strategies">Strategies</a></li><li><a href="#differences-between-v1-and-v2">Differences between v1 and v2</a></li><li><a href="#memory-tuning-and-resource-limits">Memory tuning and resource limits</a></li><li><a href="#performance-tuning-for-groupby-v2">Performance tuning for groupBy v2</a></li><li><a href="#alternatives">Alternatives</a></li><li><a href="#nested-groupbys">Nested groupBys</a></li><li><a href="#configurations">Configurations</a></li><li><a href="#advanced-configurations">Advanced configurations</a></li></ul></li></ul></nav></div><footer class="nav-footer druid-footer" id="footer"><div class="container"><div class="text-center"><p><a href="/technology">Technology</a> · <a href="/use-cases">Use Cases</a> · <a href="/druid-powered">Powered by Druid</a> · <a href="/docs/0.20.0/latest">Docs</a> · <a href="/community/">Community</a> · <a href="/downloads.html">Download</a> · <a href="/faq">FAQ</a></p></div><div class="text-center"><a title="Join the user group" href="https://groups.google.com/forum/#!forum/druid-user" target="_blank"><span class="fa fa-comments"></span></a> · <a title="Follow Druid" href="https://twitter.com/druidio" target="_blank"><span class="fab fa-twitter"></span></a> · <a title="Download via Apache" href="https://www.apache.org/dyn/closer.cgi?path=/incubator/druid/{{ site.druid_versions[0].versions[0].version }}/apache-druid-{{ site.druid_versions[0].versions[0].version }}-bin.tar.gz" target="_blank"><span class="fas fa-feather"></span></a> · <a title="GitHub" href="https://github.com/apache/druid" target="_blank"><span class="fab fa-github"></span></a></div><div class="text-center license">Copyright © 2019 <a href="https://www.apache.org/" target="_blank">Apache Software Foundation</a>.<br/>Except where otherwise noted, licensed under <a rel="license" href="http://creativecommons.org/licenses/by-sa/4.0/">CC BY-SA 4.0</a>.<br/>Apache Druid, Druid, and the Druid logo are either registered trademarks or trademarks of The Apache Software Foundation in the United States and other countries.</div></div></footer></div><script type="text/javascript" src="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.js"></script><script>
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@@ -0,0 +1,287 @@
+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Having filters (groupBy) · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/0.20.0/querying/having.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.20.0" /><meta property="og:title" content="Having filters (groupBy) · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
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+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
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+  ~ regarding copyright ownership.  The ASF licenses this file
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+  ~ KIND, either express or implied.  See the License for the
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+  ~ under the License.
+  -->
+<blockquote>
+<p>Apache Druid supports two query languages: <a href="/docs/0.20.0/querying/sql.html">Druid SQL</a> and <a href="/docs/0.20.0/querying/querying.html">native queries</a>.
+This document describes the native
+language. For information about functions available in SQL, refer to the
+<a href="/docs/0.20.0/querying/sql.html#scalar-functions">SQL documentation</a>.</p>
+</blockquote>
+<p>A having clause is a JSON object identifying which rows from a groupBy query should be returned, by specifying conditions on aggregated values.</p>
+<p>It is essentially the equivalent of the HAVING clause in SQL.</p>
+<p>Apache Druid supports the following types of having clauses.</p>
+<h3><a class="anchor" aria-hidden="true" id="query-filters"></a><a href="#query-filters" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Query filters</h3>
+<p>Query filter HavingSpecs allow all <a href="filters.html">Druid query filters</a> to be used in the Having part of the query.</p>
+<p>The grammar for a query filter HavingSpec is:</p>
+<pre><code class="hljs css language-json">{
+    "queryType": "groupBy",
+    "dataSource": "sample_datasource",
+    ...
+    "having":
+        {
+            "type" : "filter",
+            "filter" : &lt;any Druid query filter&gt;
+        }
+}
+</code></pre>
+<p>For example, to use a selector filter:</p>
+<pre><code class="hljs css language-json">{
+    "queryType": "groupBy",
+    "dataSource": "sample_datasource",
+    ...
+    "having":
+        {
+            "type" : "filter",
+            "filter" : {
+              "type": "selector",
+              "dimension" : "&lt;dimension&gt;",
+              "value" : "&lt;dimension_value&gt;"
+            }
+        }
+}
+</code></pre>
+<p>You can use &quot;filter&quot; HavingSpecs to filter on the timestamp of result rows by applying a filter to the &quot;__time&quot;
+column.</p>
+<h3><a class="anchor" aria-hidden="true" id="numeric-filters"></a><a href="#numeric-filters" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Numeric filters</h3>
+<p>The simplest having clause is a numeric filter.
+Numeric filters can be used as the base filters for more complex boolean expressions of filters.</p>
+<p>Here's an example of a having-clause numeric filter:</p>
+<pre><code class="hljs css language-json">{
+    "queryType": "groupBy",
+    "dataSource": "sample_datasource",
+    ...
+    "having":
+        {
+            "type": "greaterThan",
+            "aggregation": "&lt;aggregate_metric&gt;",
+            "value": &lt;numeric_value&gt;
+        }
+}
+</code></pre>
+<h4><a class="anchor" aria-hidden="true" id="equal-to"></a><a href="#equal-to" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Equal To</h4>
+<p>The equalTo filter will match rows with a specific aggregate value.
+The grammar for an <code>equalTo</code> filter is as follows:</p>
+<pre><code class="hljs css language-json">{
+    "queryType": "groupBy",
+    "dataSource": "sample_datasource",
+    ...
+    "having":
+        {
+            "type": "equalTo",
+            "aggregation": "&lt;aggregate_metric&gt;",
+            "value": &lt;numeric_value&gt;
+        }
+}
+</code></pre>
+<p>This is the equivalent of <code>HAVING &lt;aggregate&gt; = &lt;value&gt;</code>.</p>
+<h4><a class="anchor" aria-hidden="true" id="greater-than"></a><a href="#greater-than" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Greater Than</h4>
+<p>The greaterThan filter will match rows with aggregate values greater than the given value.
+The grammar for a <code>greaterThan</code> filter is as follows:</p>
+<pre><code class="hljs css language-json">{
+    "queryType": "groupBy",
+    "dataSource": "sample_datasource",
+    ...
+    "having":
+        {
+            "type": "greaterThan",
+            "aggregation": "&lt;aggregate_metric&gt;",
+            "value": &lt;numeric_value&gt;
+        }
+}
+</code></pre>
+<p>This is the equivalent of <code>HAVING &lt;aggregate&gt; &gt; &lt;value&gt;</code>.</p>
+<h4><a class="anchor" aria-hidden="true" id="less-than"></a><a href="#less-than" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Less Than</h4>
+<p>The lessThan filter will match rows with aggregate values less than the specified value.
+The grammar for a <code>greaterThan</code> filter is as follows:</p>
+<pre><code class="hljs css language-json">{
+    "queryType": "groupBy",
+    "dataSource": "sample_datasource",
+    ...
+    "having":
+        {
+            "type": "lessThan",
+            "aggregation": "&lt;aggregate_metric&gt;",
+            "value": &lt;numeric_value&gt;
+        }
+}
+</code></pre>
+<p>This is the equivalent of <code>HAVING &lt;aggregate&gt; &lt; &lt;value&gt;</code>.</p>
+<h3><a class="anchor" aria-hidden="true" id="dimension-selector-filter"></a><a href="#dimension-selector-filter" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Dimension Selector Filter</h3>
+<h4><a class="anchor" aria-hidden="true" id="dimselector"></a><a href="#dimselector" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>dimSelector</h4>
+<p>The dimSelector filter will match rows with dimension values equal to the specified value.
+The grammar for a <code>dimSelector</code> filter is as follows:</p>
+<pre><code class="hljs css language-json">{
+    "queryType": "groupBy",
+    "dataSource": "sample_datasource",
+    ...
+    "having":
+       {
+            "type": "dimSelector",
+            "dimension": "&lt;dimension&gt;",
+            "value": &lt;dimension_value&gt;
+        }
+}
+</code></pre>
+<h3><a class="anchor" aria-hidden="true" id="logical-expression-filters"></a><a href="#logical-expression-filters" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Logical expression filters</h3>
+<h4><a class="anchor" aria-hidden="true" id="and"></a><a href="#and" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>AND</h4>
+<p>The grammar for an AND filter is as follows:</p>
+<pre><code class="hljs css language-json">{
+    "queryType": "groupBy",
+    "dataSource": "sample_datasource",
+    ...
+    "having":
+        {
+            "type": "and",
+            "havingSpecs": [
+                {
+                    "type": "greaterThan",
+                    "aggregation": "&lt;aggregate_metric&gt;",
+                    "value": &lt;numeric_value&gt;
+                },
+                {
+                    "type": "lessThan",
+                    "aggregation": "&lt;aggregate_metric&gt;",
+                    "value": &lt;numeric_value&gt;
+                }
+            ]
+        }
+}
+</code></pre>
+<h4><a class="anchor" aria-hidden="true" id="or"></a><a href="#or" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>OR</h4>
+<p>The grammar for an OR filter is as follows:</p>
+<pre><code class="hljs css language-json">{
+    "queryType": "groupBy",
+    "dataSource": "sample_datasource",
+    ...
+    "having":
+        {
+            "type": "or",
+            "havingSpecs": [
+                {
+                    "type": "greaterThan",
+                    "aggregation": "&lt;aggregate_metric&gt;",
+                    "value": &lt;numeric_value&gt;
+                },
+                {
+                    "type": "equalTo",
+                    "aggregation": "&lt;aggregate_metric&gt;",
+                    "value": &lt;numeric_value&gt;
+                }
+            ]
+        }
+}
+</code></pre>
+<h4><a class="anchor" aria-hidden="true" id="not"></a><a href="#not" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>NOT</h4>
+<p>The grammar for a NOT filter is as follows:</p>
+<pre><code class="hljs css language-json">{
+    "queryType": "groupBy",
+    "dataSource": "sample_datasource",
+    ...
+    "having":
+        {
+        "type": "not",
+        "havingSpec":
+            {
+                "type": "equalTo",
+                "aggregation": "&lt;aggregate_metric&gt;",
+                "value": &lt;numeric_value&gt;
+            }
+        }
+}
+</code></pre>
+</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/0.20.0/misc/math-expr.html"><span class="arrow-prev">← </span><span>Expressions</span></a><a class="docs-next button" href="/docs/0.20.0/querying/limitspec.html"><span class="function-name-prevnext">Sorting and limiting (groupBy)</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"></nav></div><footer class="nav-footer druid-footer" id="footer"><div class="container"><div class="text-center"><p><a href="/technology">Technology</a> · <a href="/use-cases">Use Cases</a> · <a href="/druid-powered">Powered by Druid</a> · <a href="/docs/0.20.0/latest">Docs</a> · <a href="/community/">Community</a> · <a href="/downloads.html">Download</a> · <a href="/faq">FAQ</a></p></div><div class="text-center"><a title="Join the user group" href="https://groups.google.com/forum/#!forum/druid-user" target="_blank"><span class="fa fa-comments"></span></a> · <a title="Follow Druid" href="https://twitter.com/druidio" target="_blank"><span class="fab fa-twitter"></span></a> · <a title="Download via Apache" href="https://www.apache.org/dyn/closer.cgi?path=/incubator/druid/{{ site.druid_versions[0].versions[0].version }}/apache-druid-{{ site.druid_versions[0].versions[0].version }}-bin.tar.gz" target="_blank"><span class="fas fa-feather"></span></a> · <a title="GitHub" href="https://github.com/apache/druid" target="_blank"><span class="fab fa-github"></span></a></div><div class="text-center license">Copyright © 2019 <a href="https://www.apache.org/" target="_blank">Apache Software Foundation</a>.<br/>Except where otherwise noted, licensed under <a rel="license" href="http://creativecommons.org/licenses/by-sa/4.0/">CC BY-SA 4.0</a>.<br/>Apache Druid, Druid, and the Druid logo are either registered trademarks or trademarks of The Apache Software Foundation in the United States and other countries.</div></div></footer></div><script type="text/javascript" src="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.js"></script><script>
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+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Cardinality/HyperUnique aggregators · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/0.20.0/querying/hll-old.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.20.0" /><meta property="og:title" content="Cardinality/HyperUnique aggregators · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
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+<h2><a class="anchor" aria-hidden="true" id="cardinality-aggregator"></a><a href="#cardinality-aggregator" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Cardinality aggregator</h2>
+<p>Computes the cardinality of a set of Apache Druid dimensions, using HyperLogLog to estimate the cardinality. Please note that this
+aggregator will be much slower than indexing a column with the hyperUnique aggregator. This aggregator also runs over a dimension column, which
+means the string dimension cannot be removed from the dataset to improve rollup. In general, we strongly recommend using the hyperUnique aggregator
+instead of the cardinality aggregator if you do not care about the individual values of a dimension.</p>
+<pre><code class="hljs css language-json">{
+  "type": "cardinality",
+  "name": "&lt;output_name&gt;",
+  "fields": [ &lt;dimension1&gt;, &lt;dimension2&gt;, ... ],
+  "byRow": &lt;false | true&gt; # (optional, defaults to false),
+  "round": &lt;false | true&gt; # (optional, defaults to false)
+}
+</code></pre>
+<p>Each individual element of the &quot;fields&quot; list can be a String or <a href="/docs/0.20.0/querying/dimensionspecs.html">DimensionSpec</a>. A String dimension in the fields list is equivalent to a DefaultDimensionSpec (no transformations).</p>
+<p>The HyperLogLog algorithm generates decimal estimates with some error. &quot;round&quot; can be set to true to round off estimated
+values to whole numbers. Note that even with rounding, the cardinality is still an estimate. The &quot;round&quot; field only
+affects query-time behavior, and is ignored at ingestion-time.</p>
+<h3><a class="anchor" aria-hidden="true" id="cardinality-by-value"></a><a href="#cardinality-by-value" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Cardinality by value</h3>
+<p>When setting <code>byRow</code> to <code>false</code> (the default) it computes the cardinality of the set composed of the union of all dimension values for all the given dimensions.</p>
+<ul>
+<li>For a single dimension, this is equivalent to</li>
+</ul>
+<pre><code class="hljs css language-sql"><span class="hljs-keyword">SELECT</span> <span class="hljs-keyword">COUNT</span>(<span class="hljs-keyword">DISTINCT</span>(<span class="hljs-keyword">dimension</span>)) <span class="hljs-keyword">FROM</span> &lt;datasource&gt;
+</code></pre>
+<ul>
+<li>For multiple dimensions, this is equivalent to something akin to</li>
+</ul>
+<pre><code class="hljs css language-sql"><span class="hljs-keyword">SELECT</span> <span class="hljs-keyword">COUNT</span>(<span class="hljs-keyword">DISTINCT</span>(<span class="hljs-keyword">value</span>)) <span class="hljs-keyword">FROM</span> (
+  <span class="hljs-keyword">SELECT</span> dim_1 <span class="hljs-keyword">as</span> <span class="hljs-keyword">value</span> <span class="hljs-keyword">FROM</span> &lt;datasource&gt;
+  <span class="hljs-keyword">UNION</span>
+  <span class="hljs-keyword">SELECT</span> dim_2 <span class="hljs-keyword">as</span> <span class="hljs-keyword">value</span> <span class="hljs-keyword">FROM</span> &lt;datasource&gt;
+  <span class="hljs-keyword">UNION</span>
+  <span class="hljs-keyword">SELECT</span> dim_3 <span class="hljs-keyword">as</span> <span class="hljs-keyword">value</span> <span class="hljs-keyword">FROM</span> &lt;datasource&gt;
+)
+</code></pre>
+<h3><a class="anchor" aria-hidden="true" id="cardinality-by-row"></a><a href="#cardinality-by-row" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Cardinality by row</h3>
+<p>When setting <code>byRow</code> to <code>true</code> it computes the cardinality by row, i.e. the cardinality of distinct dimension combinations.
+This is equivalent to something akin to</p>
+<pre><code class="hljs css language-sql"><span class="hljs-keyword">SELECT</span> <span class="hljs-keyword">COUNT</span>(*) <span class="hljs-keyword">FROM</span> ( <span class="hljs-keyword">SELECT</span> DIM1, DIM2, DIM3 <span class="hljs-keyword">FROM</span> &lt;datasource&gt; <span class="hljs-keyword">GROUP</span> <span class="hljs-keyword">BY</span> DIM1, DIM2, DIM3 )
+</code></pre>
+<p><strong>Example</strong></p>
+<p>Determine the number of distinct countries people are living in or have come from.</p>
+<pre><code class="hljs css language-json">{
+  <span class="hljs-attr">"type"</span>: <span class="hljs-string">"cardinality"</span>,
+  <span class="hljs-attr">"name"</span>: <span class="hljs-string">"distinct_countries"</span>,
+  <span class="hljs-attr">"fields"</span>: [ <span class="hljs-string">"country_of_origin"</span>, <span class="hljs-string">"country_of_residence"</span> ]
+}
+</code></pre>
+<p>Determine the number of distinct people (i.e. combinations of first and last name).</p>
+<pre><code class="hljs css language-json">{
+  <span class="hljs-attr">"type"</span>: <span class="hljs-string">"cardinality"</span>,
+  <span class="hljs-attr">"name"</span>: <span class="hljs-string">"distinct_people"</span>,
+  <span class="hljs-attr">"fields"</span>: [ <span class="hljs-string">"first_name"</span>, <span class="hljs-string">"last_name"</span> ],
+  <span class="hljs-attr">"byRow"</span> : <span class="hljs-literal">true</span>
+}
+</code></pre>
+<p>Determine the number of distinct starting characters of last names</p>
+<pre><code class="hljs css language-json">{
+  <span class="hljs-attr">"type"</span>: <span class="hljs-string">"cardinality"</span>,
+  <span class="hljs-attr">"name"</span>: <span class="hljs-string">"distinct_last_name_first_char"</span>,
+  <span class="hljs-attr">"fields"</span>: [
+    {
+     <span class="hljs-attr">"type"</span> : <span class="hljs-string">"extraction"</span>,
+     <span class="hljs-attr">"dimension"</span> : <span class="hljs-string">"last_name"</span>,
+     <span class="hljs-attr">"outputName"</span> :  <span class="hljs-string">"last_name_first_char"</span>,
+     <span class="hljs-attr">"extractionFn"</span> : { <span class="hljs-attr">"type"</span> : <span class="hljs-string">"substring"</span>, <span class="hljs-attr">"index"</span> : <span class="hljs-number">0</span>, <span class="hljs-attr">"length"</span> : <span class="hljs-number">1</span> }
+    }
+  ],
+  <span class="hljs-attr">"byRow"</span> : <span class="hljs-literal">true</span>
+}
+</code></pre>
+<h2><a class="anchor" aria-hidden="true" id="hyperunique-aggregator"></a><a href="#hyperunique-aggregator" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>HyperUnique aggregator</h2>
+<p>Uses <a href="http://algo.inria.fr/flajolet/Publications/FlFuGaMe07.pdf">HyperLogLog</a> to compute the estimated cardinality of a dimension that has been aggregated as a &quot;hyperUnique&quot; metric at indexing time.</p>
+<pre><code class="hljs css language-json">{
+  <span class="hljs-attr">"type"</span> : <span class="hljs-string">"hyperUnique"</span>,
+  <span class="hljs-attr">"name"</span> : &lt;output_name&gt;,
+  <span class="hljs-attr">"fieldName"</span> : &lt;metric_name&gt;,
+  <span class="hljs-attr">"isInputHyperUnique"</span> : <span class="hljs-literal">false</span>,
+  <span class="hljs-attr">"round"</span> : <span class="hljs-literal">false</span>
+}
+</code></pre>
+<p>&quot;isInputHyperUnique&quot; can be set to true to index precomputed HLL (Base64 encoded output from druid-hll is expected).
+The &quot;isInputHyperUnique&quot; field only affects ingestion-time behavior, and is ignored at query-time.</p>
+<p>The HyperLogLog algorithm generates decimal estimates with some error. &quot;round&quot; can be set to true to round off estimated
+values to whole numbers. Note that even with rounding, the cardinality is still an estimate. The &quot;round&quot; field only
+affects query-time behavior, and is ignored at ingestion-time.</p>
+</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/0.20.0/development/extensions-contrib/aliyun-oss.html"><span class="arrow-prev">← </span><span>Aliyun OSS</span></a><a class="docs-next button" href="/docs/0.20.0/querying/select-query.html"><span>Select</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#cardinality-aggregator">Cardinality aggregator</a><ul class="toc-headings"><li><a href="#cardinality-by-value">Cardinality by value</a></li><li><a href="#cardinality-by-row">Cardinality by row</a></li></ul></li><li><a href="#hyperunique-aggregator">HyperUnique aggregator</a></li></ul></nav></div><footer class="nav-footer druid-footer" id="footer"><div class="container"><div class="text-center"><p><a href="/technology">Technology</a> · <a href="/use-cases">Use Cases</a> · <a href="/druid-powered">Powered by Druid</a> · <a href="/docs/0.20.0/latest">Docs</a> · <a href="/community/">Community</a> · <a href="/downloads.html">Download</a> · <a href="/faq">FAQ</a></p></div><div class="text-center"><a title="Join the user group" href="https://groups.google.com/forum/#!forum/druid-user" target="_blank"><span class="fa fa-comments"></span></a> · <a title="Follow Druid" href="https://twitter.com/druidio" target="_blank"><span class="fab fa-twitter"></span></a> · <a title="Download via Apache" href="https://www.apache.org/dyn/closer.cgi?path=/incubator/druid/{{ site.druid_versions[0].versions[0].version }}/apache-druid-{{ site.druid_versions[0].versions[0].version }}-bin.tar.gz" target="_blank"><span class="fas fa-feather"></span></a> · <a title="GitHub" href="https://github.com/apache/druid" target="_blank"><span class="fab fa-github"></span></a></div><div class="text-center license">Copyright © 2019 <a href="https://www.apache.org/" target="_blank">Apache Software Foundation</a>.<br/>Except where otherwise noted, licensed under <a rel="license" href="http://creativecommons.org/licenses/by-sa/4.0/">CC BY-SA 4.0</a>.<br/>Apache Druid, Druid, and the Druid logo are either registered trademarks or trademarks of The Apache Software Foundation in the United States and other countries.</div></div></footer></div><script type="text/javascript" src="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.js"></script><script>
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+        </script></nav></div><div class="container mainContainer docsContainer"><div class="wrapper"><div class="post"><header class="postHeader"><a class="edit-page-link button" href="https://github.com/apache/druid/edit/master/docs/querying/joins.md" target="_blank" rel="noreferrer noopener">Edit</a><h1 id="__docusaurus" class="postHeaderTitle">Joins</h1></header><article><div><span><!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
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+  ~ regarding copyright ownership.  The ASF licenses this file
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+<p>Druid has two features related to joining of data:</p>
+<ol>
+<li><a href="/docs/0.20.0/querying/datasource.html#join">Join</a> operators. These are available using a <a href="/docs/0.20.0/querying/datasource.html#join">join datasource</a> in native
+queries, or using the <a href="/docs/0.20.0/querying/sql.html#query-syntax">JOIN operator</a> in Druid SQL. Refer to the
+<a href="/docs/0.20.0/querying/datasource.html#join">join datasource</a> documentation for information about how joins work in Druid.</li>
+<li><a href="/docs/0.20.0/querying/lookups.html">Query-time lookups</a>, simple key-to-value mappings. These are preloaded on all servers that are involved
+in queries and can be accessed with or without an explicit join operator. Refer to the <a href="/docs/0.20.0/querying/lookups.html">lookups</a>
+documentation for more details.</li>
+</ol>
+<p>Whenever possible, for best performance it is good to avoid joins at query time. Often this can be accomplished by
+joining data before it is loaded into Druid. However, there are situations where joins or lookups are the best solution
+available despite the performance overhead, including:</p>
+<ul>
+<li>The fact-to-dimension (star and snowflake schema) case: you need to change dimension values after initial ingestion,
+and aren't able to reingest to do this. In this case, you can use lookups for your dimension tables.</li>
+<li>Your workload requires joins or filters on subqueries.</li>
+</ul>
+</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/0.20.0/querying/datasource.html"><span class="arrow-prev">← </span><span>Datasources</span></a><a class="docs-next button" href="/docs/0.20.0/querying/lookups.html"><span>Lookups</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"></nav></div><footer class="nav-footer druid-footer" id="footer"><div class="container"><div class="text-center"><p><a href="/technology">Technology</a> · <a href="/use-cases">Use Cases</a> · <a href="/druid-powered">Powered by Druid</a> · <a href="/docs/0.20.0/latest">Docs</a> · <a href="/community/">Community</a> · <a href="/downloads.html">Download</a> · <a href="/faq">FAQ</a></p></div><div class="text-center"><a title="Join the user group" href="https://groups.google.com/forum/#!forum/druid-user" target="_blank"><span class="fa fa-comments"></span></a> · <a title="Follow Druid" href="https://twitter.com/druidio" target="_blank"><span class="fab fa-twitter"></span></a> · <a title="Download via Apache" href="https://www.apache.org/dyn/closer.cgi?path=/incubator/druid/{{ site.druid_versions[0].versions[0].version }}/apache-druid-{{ site.druid_versions[0].versions[0].version }}-bin.tar.gz" target="_blank"><span class="fas fa-feather"></span></a> · <a title="GitHub" href="https://github.com/apache/druid" target="_blank"><span class="fab fa-github"></span></a></div><div class="text-center license">Copyright © 2019 <a href="https://www.apache.org/" target="_blank">Apache Software Foundation</a>.<br/>Except where otherwise noted, licensed under <a rel="license" href="http://creativecommons.org/licenses/by-sa/4.0/">CC BY-SA 4.0</a>.<br/>Apache Druid, Druid, and the Druid logo are either registered trademarks or trademarks of The Apache Software Foundation in the United States and other countries.</div></div></footer></div><script type="text/javascript" src="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.js"></script><script>
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+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
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+<blockquote>
+<p>Apache Druid supports two query languages: <a href="/docs/0.20.0/querying/sql.html">Druid SQL</a> and <a href="/docs/0.20.0/querying/querying.html">native queries</a>.
+This document describes the native
+language. For information about sorting in SQL, refer to the <a href="/docs/0.20.0/querying/sql.html#order-by">SQL documentation</a>.</p>
+</blockquote>
+<p>The limitSpec field provides the functionality to sort and limit the set of results from a groupBy query. If you group by a single dimension and are ordering by a single metric, we highly recommend using <a href="/docs/0.20.0/querying/topnquery.html">TopN Queries</a> instead. The performance will be substantially better. Available options are:</p>
+<h3><a class="anchor" aria-hidden="true" id="defaultlimitspec"></a><a href="#defaultlimitspec" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>DefaultLimitSpec</h3>
+<p>The default limit spec takes a limit and the list of columns to do an orderBy operation over. The grammar is:</p>
+<pre><code class="hljs css language-json">{
+    <span class="hljs-attr">"type"</span>    : <span class="hljs-string">"default"</span>,
+    <span class="hljs-attr">"limit"</span>   : &lt;optional integer&gt;,
+    <span class="hljs-attr">"offset"</span>  : &lt;optional integer&gt;,
+    <span class="hljs-attr">"columns"</span> : [&lt;optional list of OrderByColumnSpec&gt;],
+}
+</code></pre>
+<p>The &quot;limit&quot; parameter is the maximum number of rows to return.</p>
+<p>The &quot;offset&quot; parameter tells Druid to skip this many rows when returning results. If both &quot;limit&quot; and &quot;offset&quot; are
+provided, then &quot;offset&quot; will be applied first, followed by &quot;limit&quot;. For example, a spec with limit 100 and offset 10
+will return 100 rows starting from row number 10. Internally, the query is executed by extending the limit by the offset
+and then discarding a number of rows equal to the offset. This means that raising the offset will increase resource
+usage by an amount similar to increasing the limit.</p>
+<p>Together, &quot;limit&quot; and &quot;offset&quot; can be used to implement pagination. However, note that if the underlying datasource is
+modified in between page fetches in ways that affect overall query results, then the different pages will not
+necessarily align with each other.</p>
+<h4><a class="anchor" aria-hidden="true" id="orderbycolumnspec"></a><a href="#orderbycolumnspec" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>OrderByColumnSpec</h4>
+<p>OrderByColumnSpecs indicate how to do order by operations. Each order-by condition can be a <code>jsonString</code> or a map of the following form:</p>
+<pre><code class="hljs css language-json">{
+    <span class="hljs-attr">"dimension"</span> : <span class="hljs-string">"&lt;Any dimension or metric name&gt;"</span>,
+    <span class="hljs-attr">"direction"</span> : &lt;<span class="hljs-string">"ascending"</span>|<span class="hljs-string">"descending"</span>&gt;,
+    <span class="hljs-attr">"dimensionOrder"</span> : &lt;<span class="hljs-string">"lexicographic"</span>(default)|<span class="hljs-string">"alphanumeric"</span>|<span class="hljs-string">"strlen"</span>|<span class="hljs-string">"numeric"</span>&gt;
+}
+</code></pre>
+<p>If only the dimension is provided (as a JSON string), the default order-by is ascending with lexicographic sorting.</p>
+<p>See <a href="/docs/0.20.0/querying/sorting-orders.html">Sorting Orders</a> for more information on the sorting orders specified by &quot;dimensionOrder&quot;.</p>
+</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/0.20.0/querying/having.html"><span class="arrow-prev">← </span><span class="function-name-prevnext">Having filters (groupBy)</span></a><a class="docs-next button" href="/docs/0.20.0/querying/topnmetricspec.html"><span class="function-name-prevnext">Sorting (topN)</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"></nav></div><footer class="nav-footer druid-footer" id="footer"><div class="container"><div class="text-center"><p><a href="/technology">Technology</a> · <a href="/use-cases">Use Cases</a> · <a href="/druid-powered">Powered by Druid</a> · <a href="/docs/0.20.0/latest">Docs</a> · <a href="/community/">Community</a> · <a href="/downloads.html">Download</a> · <a href="/faq">FAQ</a></p></div><div class="text-center"><a title="Join the user group" href="https://groups.google.com/forum/#!forum/druid-user" target="_blank"><span class="fa fa-comments"></span></a> · <a title="Follow Druid" href="https://twitter.com/druidio" target="_blank"><span class="fab fa-twitter"></span></a> · <a title="Download via Apache" href="https://www.apache.org/dyn/closer.cgi?path=/incubator/druid/{{ site.druid_versions[0].versions[0].version }}/apache-druid-{{ site.druid_versions[0].versions[0].version }}-bin.tar.gz" target="_blank"><span class="fas fa-feather"></span></a> · <a title="GitHub" href="https://github.com/apache/druid" target="_blank"><span class="fab fa-github"></span></a></div><div class="text-center license">Copyright © 2019 <a href="https://www.apache.org/" target="_blank">Apache Software Foundation</a>.<br/>Except where otherwise noted, licensed under <a rel="license" href="http://creativecommons.org/licenses/by-sa/4.0/">CC BY-SA 4.0</a>.<br/>Apache Druid, Druid, and the Druid logo are either registered trademarks or trademarks of The Apache Software Foundation in the United States and other countries.</div></div></footer></div><script type="text/javascript" src="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.js"></script><script>
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+        </script></nav></div><div class="container mainContainer docsContainer"><div class="wrapper"><div class="post"><header class="postHeader"><a class="edit-page-link button" href="https://github.com/apache/druid/edit/master/docs/querying/lookups.md" target="_blank" rel="noreferrer noopener">Edit</a><h1 id="__docusaurus" class="postHeaderTitle">Lookups</h1></header><article><div><span><!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
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+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
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+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+  -->
+<blockquote>
+<p>Lookups are an <a href="/docs/0.20.0/development/experimental.html">experimental</a> feature.</p>
+</blockquote>
+<p>Lookups are a concept in Apache Druid where dimension values are (optionally) replaced with new values, allowing join-like
+functionality. Applying lookups in Druid is similar to joining a dimension table in a data warehouse. See
+<a href="/docs/0.20.0/querying/dimensionspecs.html">dimension specs</a> for more information. For the purpose of these documents, a &quot;key&quot;
+refers to a dimension value to match, and a &quot;value&quot; refers to its replacement. So if you wanted to map
+<code>appid-12345</code> to <code>Super Mega Awesome App</code> then the key would be <code>appid-12345</code> and the value would be
+<code>Super Mega Awesome App</code>.</p>
+<p>It is worth noting that lookups support not just use cases where keys map one-to-one to unique values, such as country
+code and country name, but also support use cases where multiple IDs map to the same value, e.g. multiple app-ids
+mapping to a single account manager. When lookups are one-to-one, Druid is able to apply additional optimizations at
+query time; see <a href="#query-execution">Query execution</a> below for more details.</p>
+<p>Lookups do not have history. They always use the current data. This means that if the chief account manager for a
+particular app-id changes, and you issue a query with a lookup to store the app-id to account manager relationship,
+it will return the current account manager for that app-id REGARDLESS of the time range over which you query.</p>
+<p>If you require data time range sensitive lookups, such a use case is not currently supported dynamically at query time,
+and such data belongs in the raw denormalized data for use in Druid.</p>
+<p>Lookups are generally preloaded in-memory on all servers. But very small lookups (on the order of a few dozen to a few
+hundred entries) can also be passed inline in native queries time using the &quot;map&quot; lookup type. Refer to the
+<a href="/docs/0.20.0/querying/dimensionspecs.html">dimension specs</a> documentation for details.</p>
+<p>Other lookup types are available as extensions, including:</p>
+<ul>
+<li>Globally cached lookups from local files, remote URIs, or JDBC through <a href="/docs/0.20.0/development/extensions-core/lookups-cached-global.html">lookups-cached-global</a>.</li>
+<li>Globally cached lookups from a Kafka topic through <a href="/docs/0.20.0/development/extensions-core/kafka-extraction-namespace.html">kafka-extraction-namespace</a>.</li>
+</ul>
+<h2><a class="anchor" aria-hidden="true" id="query-syntax"></a><a href="#query-syntax" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Query Syntax</h2>
+<p>In <a href="sql.html">Druid SQL</a>, lookups can be queried using the <a href="/docs/0.20.0/querying/sql.html#string-functions"><code>LOOKUP</code> function</a>, for example:</p>
+<pre><code class="hljs css language-sql"><span class="hljs-keyword">SELECT</span>
+  LOOKUP(<span class="hljs-keyword">store</span>, <span class="hljs-string">'store_to_country'</span>) <span class="hljs-keyword">AS</span> country,
+  <span class="hljs-keyword">SUM</span>(revenue)
+<span class="hljs-keyword">FROM</span> sales
+<span class="hljs-keyword">GROUP</span> <span class="hljs-keyword">BY</span> <span class="hljs-number">1</span>
+</code></pre>
+<p>They can also be queried using the <a href="/docs/0.20.0/querying/datasource.html#join">JOIN operator</a>:</p>
+<pre><code class="hljs css language-sql"><span class="hljs-keyword">SELECT</span>
+  store_to_country.v <span class="hljs-keyword">AS</span> country,
+  <span class="hljs-keyword">SUM</span>(sales.revenue) <span class="hljs-keyword">AS</span> country_revenue
+<span class="hljs-keyword">FROM</span>
+  sales
+  <span class="hljs-keyword">INNER</span> <span class="hljs-keyword">JOIN</span> lookup.store_to_country <span class="hljs-keyword">ON</span> sales.store = store_to_country.k
+<span class="hljs-keyword">GROUP</span> <span class="hljs-keyword">BY</span> <span class="hljs-number">1</span>
+</code></pre>
+<p>In native queries, lookups can be queried with <a href="dimensionspecs.html">dimension specs or extraction functions</a>.</p>
+<h2><a class="anchor" aria-hidden="true" id="query-execution"></a><a href="#query-execution" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Query Execution</h2>
+<p>When executing an aggregation query involving lookup functions (like the SQL <a href="/docs/0.20.0/querying/sql.html#string-functions"><code>LOOKUP</code> function</a>,
+Druid can decide to apply them while scanning and aggregating rows, or to apply them after aggregation is complete. It
+is more efficient to apply lookups after aggregation is complete, so Druid will do this if it can. Druid decides this
+by checking if the lookup is marked as &quot;injective&quot; or not. In general, you should set this property for any lookup that
+is naturally one-to-one, to allow Druid to run your queries as fast as possible.</p>
+<p>Injective lookups should include <em>all</em> possible keys that may show up in your dataset, and should also map all keys to
+<em>unique values</em>. This matters because non-injective lookups may map different keys to the same value, which must be
+accounted for during aggregation, lest query results contain two result values that should have been aggregated into
+one.</p>
+<p>This lookup is injective (assuming it contains all possible keys from your data):</p>
+<pre><code class="hljs"><span class="hljs-symbol">1 </span>-&gt; Foo
+<span class="hljs-symbol">2 </span>-&gt; Bar
+<span class="hljs-symbol">3 </span>-&gt; Billy
+</code></pre>
+<p>But this one is not, since both &quot;2&quot; and &quot;3&quot; map to the same key:</p>
+<pre><code class="hljs"><span class="hljs-symbol">1 </span>-&gt; Foo
+<span class="hljs-symbol">2 </span>-&gt; Bar
+<span class="hljs-symbol">3 </span>-&gt; Bar
+</code></pre>
+<p>To tell Druid that your lookup is injective, you must specify <code>&quot;injective&quot; : true</code> in the lookup configuration. Druid
+will not detect this automatically.</p>
+<blockquote>
+<p>Currently, the injective lookup optimization is not triggered when lookups are inputs to a
+<a href="/docs/0.20.0/querying/datasource.html#join">join datasource</a>. It is only used when lookup functions are used directly, without the join
+operator.</p>
+</blockquote>
+<h2><a class="anchor" aria-hidden="true" id="dynamic-configuration"></a><a href="#dynamic-configuration" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Dynamic Configuration</h2>
+<blockquote>
+<p>Dynamic lookup configuration is an <a href="/docs/0.20.0/development/experimental.html">experimental</a> feature. Static
+configuration is no longer supported.
+The following documents the behavior of the cluster-wide config which is accessible through the Coordinator.
+The configuration is propagated through the concept of &quot;tier&quot; of servers.
+A &quot;tier&quot; is defined as a group of services which should receive a set of lookups.
+For example, you might have all Historicals be part of <code>__default</code>, and Peons be part of individual tiers for the datasources they are tasked with.
+The tiers for lookups are completely independent of Historical tiers.</p>
+</blockquote>
+<p>These configs are accessed using JSON through the following URI template</p>
+<pre><code class="hljs"><span class="xml">http://<span class="hljs-tag">&lt;<span class="hljs-name">COORDINATOR_IP</span>&gt;</span>:<span class="hljs-tag">&lt;<span class="hljs-name">PORT</span>&gt;</span>/druid/coordinator/v1/lookups/config/</span><span class="hljs-template-variable">{tier}</span><span class="xml">/</span><span class="hljs-template-variable">{id}</span><span class="xml">
+</span></code></pre>
+<p>All URIs below are assumed to have <code>http://&lt;COORDINATOR_IP&gt;:&lt;PORT&gt;</code> prepended.</p>
+<p>If you have NEVER configured lookups before, you MUST post an empty json object <code>{}</code> to <code>/druid/coordinator/v1/lookups/config</code> to initialize the configuration.</p>
+<p>These endpoints will return one of the following results:</p>
+<ul>
+<li>404 if the resource is not found</li>
+<li>400 if there is a problem in the formatting of the request</li>
+<li>202 if the request was accepted asynchronously (<code>POST</code> and <code>DELETE</code>)</li>
+<li>200 if the request succeeded (<code>GET</code> only)</li>
+</ul>
+<h2><a class="anchor" aria-hidden="true" id="configuration-propagation-behavior"></a><a href="#configuration-propagation-behavior" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Configuration propagation behavior</h2>
+<p>The configuration is propagated to the query serving processes (Broker / Router / Peon / Historical) by the Coordinator.
+The query serving processes have an internal API for managing lookups on the process and those are used by the Coordinator.
+The Coordinator periodically checks if any of the processes need to load/drop lookups and updates them appropriately.</p>
+<p>Please note that only 2 simultaneous lookup configuration propagation requests can be concurrently handled by a single query serving process. This limit is applied to prevent lookup handling from consuming too many server HTTP connections.</p>
+<h2><a class="anchor" aria-hidden="true" id="api-for-configuring-lookups"></a><a href="#api-for-configuring-lookups" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>API for configuring lookups</h2>
+<h3><a class="anchor" aria-hidden="true" id="bulk-update"></a><a href="#bulk-update" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Bulk update</h3>
+<p>Lookups can be updated in bulk by posting a JSON object to <code>/druid/coordinator/v1/lookups/config</code>. The format of the json object is as follows:</p>
+<pre><code class="hljs css language-json">{
+    <span class="hljs-attr">"&lt;tierName&gt;"</span>: {
+        <span class="hljs-attr">"&lt;lookupName&gt;"</span>: {
+          <span class="hljs-attr">"version"</span>: <span class="hljs-string">"&lt;version&gt;"</span>,
+          <span class="hljs-attr">"lookupExtractorFactory"</span>: {
+            <span class="hljs-attr">"type"</span>: <span class="hljs-string">"&lt;someExtractorFactoryType&gt;"</span>,
+            <span class="hljs-attr">"&lt;someExtractorField&gt;"</span>: <span class="hljs-string">"&lt;someExtractorValue&gt;"</span>
+          }
+        }
+    }
+}
+</code></pre>
+<p>Note that &quot;version&quot; is an arbitrary string assigned by the user, when making updates to existing lookup then user would need to specify a lexicographically higher version.</p>
+<p>For example, a config might look something like:</p>
+<pre><code class="hljs css language-json">{
+  <span class="hljs-attr">"__default"</span>: {
+    <span class="hljs-attr">"country_code"</span>: {
+      <span class="hljs-attr">"version"</span>: <span class="hljs-string">"v0"</span>,
+      <span class="hljs-attr">"lookupExtractorFactory"</span>: {
+        <span class="hljs-attr">"type"</span>: <span class="hljs-string">"map"</span>,
+        <span class="hljs-attr">"map"</span>: {
+          <span class="hljs-attr">"77483"</span>: <span class="hljs-string">"United States"</span>
+        }
+      }
+    },
+    <span class="hljs-attr">"site_id"</span>: {
+      <span class="hljs-attr">"version"</span>: <span class="hljs-string">"v0"</span>,
+      <span class="hljs-attr">"lookupExtractorFactory"</span>: {
+        <span class="hljs-attr">"type"</span>: <span class="hljs-string">"cachedNamespace"</span>,
+        <span class="hljs-attr">"extractionNamespace"</span>: {
+          <span class="hljs-attr">"type"</span>: <span class="hljs-string">"jdbc"</span>,
+          <span class="hljs-attr">"connectorConfig"</span>: {
+            <span class="hljs-attr">"createTables"</span>: <span class="hljs-literal">true</span>,
+            <span class="hljs-attr">"connectURI"</span>: <span class="hljs-string">"jdbc:mysql:\/\/localhost:3306\/druid"</span>,
+            <span class="hljs-attr">"user"</span>: <span class="hljs-string">"druid"</span>,
+            <span class="hljs-attr">"password"</span>: <span class="hljs-string">"diurd"</span>
+          },
+          <span class="hljs-attr">"table"</span>: <span class="hljs-string">"lookupTable"</span>,
+          <span class="hljs-attr">"keyColumn"</span>: <span class="hljs-string">"country_id"</span>,
+          <span class="hljs-attr">"valueColumn"</span>: <span class="hljs-string">"country_name"</span>,
+          <span class="hljs-attr">"tsColumn"</span>: <span class="hljs-string">"timeColumn"</span>
+        },
+        <span class="hljs-attr">"firstCacheTimeout"</span>: <span class="hljs-number">120000</span>,
+        <span class="hljs-attr">"injective"</span>: <span class="hljs-literal">true</span>
+      }
+    },
+    <span class="hljs-attr">"site_id_customer1"</span>: {
+      <span class="hljs-attr">"version"</span>: <span class="hljs-string">"v0"</span>,
+      <span class="hljs-attr">"lookupExtractorFactory"</span>: {
+        <span class="hljs-attr">"type"</span>: <span class="hljs-string">"map"</span>,
+        <span class="hljs-attr">"map"</span>: {
+          <span class="hljs-attr">"847632"</span>: <span class="hljs-string">"Internal Use Only"</span>
+        }
+      }
+    },
+    <span class="hljs-attr">"site_id_customer2"</span>: {
+      <span class="hljs-attr">"version"</span>: <span class="hljs-string">"v0"</span>,
+      <span class="hljs-attr">"lookupExtractorFactory"</span>: {
+        <span class="hljs-attr">"type"</span>: <span class="hljs-string">"map"</span>,
+        <span class="hljs-attr">"map"</span>: {
+          <span class="hljs-attr">"AHF77"</span>: <span class="hljs-string">"Home"</span>
+        }
+      }
+    }
+  },
+  <span class="hljs-attr">"realtime_customer1"</span>: {
+    <span class="hljs-attr">"country_code"</span>: {
+      <span class="hljs-attr">"version"</span>: <span class="hljs-string">"v0"</span>,
+      <span class="hljs-attr">"lookupExtractorFactory"</span>: {
+        <span class="hljs-attr">"type"</span>: <span class="hljs-string">"map"</span>,
+        <span class="hljs-attr">"map"</span>: {
+          <span class="hljs-attr">"77483"</span>: <span class="hljs-string">"United States"</span>
+        }
+      }
+    },
+    <span class="hljs-attr">"site_id_customer1"</span>: {
+      <span class="hljs-attr">"version"</span>: <span class="hljs-string">"v0"</span>,
+      <span class="hljs-attr">"lookupExtractorFactory"</span>: {
+        <span class="hljs-attr">"type"</span>: <span class="hljs-string">"map"</span>,
+        <span class="hljs-attr">"map"</span>: {
+          <span class="hljs-attr">"847632"</span>: <span class="hljs-string">"Internal Use Only"</span>
+        }
+      }
+    }
+  },
+  <span class="hljs-attr">"realtime_customer2"</span>: {
+    <span class="hljs-attr">"country_code"</span>: {
+      <span class="hljs-attr">"version"</span>: <span class="hljs-string">"v0"</span>,
+      <span class="hljs-attr">"lookupExtractorFactory"</span>: {
+        <span class="hljs-attr">"type"</span>: <span class="hljs-string">"map"</span>,
+        <span class="hljs-attr">"map"</span>: {
+          <span class="hljs-attr">"77483"</span>: <span class="hljs-string">"United States"</span>
+        }
+      }
+    },
+    <span class="hljs-attr">"site_id_customer2"</span>: {
+      <span class="hljs-attr">"version"</span>: <span class="hljs-string">"v0"</span>,
+      <span class="hljs-attr">"lookupExtractorFactory"</span>: {
+        <span class="hljs-attr">"type"</span>: <span class="hljs-string">"map"</span>,
+        <span class="hljs-attr">"map"</span>: {
+          <span class="hljs-attr">"AHF77"</span>: <span class="hljs-string">"Home"</span>
+        }
+      }
+    }
+  }
+}
+</code></pre>
+<p>All entries in the map will UPDATE existing entries. No entries will be deleted.</p>
+<h3><a class="anchor" aria-hidden="true" id="update-lookup"></a><a href="#update-lookup" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Update lookup</h3>
+<p>A <code>POST</code> to a particular lookup extractor factory via <code>/druid/coordinator/v1/lookups/config/{tier}/{id}</code> will update that specific extractor factory.</p>
+<p>For example, a post to <code>/druid/coordinator/v1/lookups/config/realtime_customer1/site_id_customer1</code> might contain the following:</p>
+<pre><code class="hljs css language-json">{
+  <span class="hljs-attr">"version"</span>: <span class="hljs-string">"v1"</span>,
+  <span class="hljs-attr">"lookupExtractorFactory"</span>: {
+    <span class="hljs-attr">"type"</span>: <span class="hljs-string">"map"</span>,
+    <span class="hljs-attr">"map"</span>: {
+      <span class="hljs-attr">"847632"</span>: <span class="hljs-string">"Internal Use Only"</span>
+    }
+  }
+}
+</code></pre>
+<p>This will replace the <code>site_id_customer1</code> lookup in the <code>realtime_customer1</code> with the definition above.</p>
+<h3><a class="anchor" aria-hidden="true" id="get-all-lookups"></a><a href="#get-all-lookups" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Get all lookups</h3>
+<p>A <code>GET</code> to <code>/druid/coordinator/v1/lookups/config/all</code> will return all known lookup specs for all tiers.</p>
+<h3><a class="anchor" aria-hidden="true" id="get-lookup"></a><a href="#get-lookup" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Get lookup</h3>
+<p>A <code>GET</code> to a particular lookup extractor factory is accomplished via <code>/druid/coordinator/v1/lookups/config/{tier}/{id}</code></p>
+<p>Using the prior example, a <code>GET</code> to <code>/druid/coordinator/v1/lookups/config/realtime_customer2/site_id_customer2</code> should return</p>
+<pre><code class="hljs css language-json">{
+  <span class="hljs-attr">"version"</span>: <span class="hljs-string">"v1"</span>,
+  <span class="hljs-attr">"lookupExtractorFactory"</span>: {
+    <span class="hljs-attr">"type"</span>: <span class="hljs-string">"map"</span>,
+    <span class="hljs-attr">"map"</span>: {
+      <span class="hljs-attr">"AHF77"</span>: <span class="hljs-string">"Home"</span>
+    }
+  }
+}
+</code></pre>
+<h3><a class="anchor" aria-hidden="true" id="delete-lookup"></a><a href="#delete-lookup" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Delete lookup</h3>
+<p>A <code>DELETE</code> to <code>/druid/coordinator/v1/lookups/config/{tier}/{id}</code> will remove that lookup from the cluster. If it was last lookup in the tier, then tier is deleted as well.</p>
+<h3><a class="anchor" aria-hidden="true" id="delete-tier"></a><a href="#delete-tier" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Delete tier</h3>
+<p>A <code>DELETE</code> to <code>/druid/coordinator/v1/lookups/config/{tier}</code> will remove that tier from the cluster.</p>
+<h3><a class="anchor" aria-hidden="true" id="list-tier-names"></a><a href="#list-tier-names" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>List tier names</h3>
+<p>A <code>GET</code> to <code>/druid/coordinator/v1/lookups/config</code> will return a list of known tier names in the dynamic configuration.
+To discover a list of tiers currently active in the cluster in addition to ones known in the dynamic configuration, the parameter <code>discover=true</code> can be added as per <code>/druid/coordinator/v1/lookups/config?discover=true</code>.</p>
+<h3><a class="anchor" aria-hidden="true" id="list-lookup-names"></a><a href="#list-lookup-names" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>List lookup names</h3>
+<p>A <code>GET</code> to <code>/druid/coordinator/v1/lookups/config/{tier}</code> will return a list of known lookup names for that tier.</p>
+<p>These end points can be used to get the propagation status of configured lookups to processes using lookups such as Historicals.</p>
+<h2><a class="anchor" aria-hidden="true" id="api-for-lookup-status"></a><a href="#api-for-lookup-status" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>API for lookup status</h2>
+<h3><a class="anchor" aria-hidden="true" id="list-load-status-of-all-lookups"></a><a href="#list-load-status-of-all-lookups" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>List load status of all lookups</h3>
+<p><code>GET /druid/coordinator/v1/lookups/status</code> with optional query parameter <code>detailed</code>.</p>
+<h3><a class="anchor" aria-hidden="true" id="list-load-status-of-lookups-in-a-tier"></a><a href="#list-load-status-of-lookups-in-a-tier" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>List load status of lookups in a tier</h3>
+<p><code>GET /druid/coordinator/v1/lookups/status/{tier}</code> with optional query parameter <code>detailed</code>.</p>
+<h3><a class="anchor" aria-hidden="true" id="list-load-status-of-single-lookup"></a><a href="#list-load-status-of-single-lookup" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>List load status of single lookup</h3>
+<p><code>GET /druid/coordinator/v1/lookups/status/{tier}/{lookup}</code> with optional query parameter <code>detailed</code>.</p>
+<h3><a class="anchor" aria-hidden="true" id="list-lookup-state-of-all-processes"></a><a href="#list-lookup-state-of-all-processes" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>List lookup state of all processes</h3>
+<p><code>GET /druid/coordinator/v1/lookups/nodeStatus</code> with optional query parameter <code>discover</code> to discover tiers advertised by other Druid nodes, or by default, returning all configured lookup tiers. The default response will also include the lookups which are loaded, being loaded, or being dropped on each node, for each tier, including the complete lookup spec. Add the optional query parameter <code>detailed=false</code> to only include the 'version' of the lookup instead of the complete spec.</p>
+<h3><a class="anchor" aria-hidden="true" id="list-lookup-state-of-processes-in-a-tier"></a><a href="#list-lookup-state-of-processes-in-a-tier" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>List lookup state of processes in a tier</h3>
+<p><code>GET /druid/coordinator/v1/lookups/nodeStatus/{tier}</code></p>
+<h3><a class="anchor" aria-hidden="true" id="list-lookup-state-of-single-process"></a><a href="#list-lookup-state-of-single-process" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>List lookup state of single process</h3>
+<p><code>GET /druid/coordinator/v1/lookups/nodeStatus/{tier}/{host:port}</code></p>
+<h2><a class="anchor" aria-hidden="true" id="internal-api"></a><a href="#internal-api" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Internal API</h2>
+<p>The Peon, Router, Broker, and Historical processes all have the ability to consume lookup configuration.
+There is an internal API these processes use to list/load/drop their lookups starting at <code>/druid/listen/v1/lookups</code>.
+These follow the same convention for return values as the cluster wide dynamic configuration. Following endpoints
+can be used for debugging purposes but not otherwise.</p>
+<h3><a class="anchor" aria-hidden="true" id="get-lookups"></a><a href="#get-lookups" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Get lookups</h3>
+<p>A <code>GET</code> to the process at <code>/druid/listen/v1/lookups</code> will return a json map of all the lookups currently active on the process.
+The return value will be a json map of the lookups to their extractor factories.</p>
+<pre><code class="hljs css language-json">{
+  <span class="hljs-attr">"site_id_customer2"</span>: {
+    <span class="hljs-attr">"version"</span>: <span class="hljs-string">"v1"</span>,
+    <span class="hljs-attr">"lookupExtractorFactory"</span>: {
+      <span class="hljs-attr">"type"</span>: <span class="hljs-string">"map"</span>,
+      <span class="hljs-attr">"map"</span>: {
+        <span class="hljs-attr">"AHF77"</span>: <span class="hljs-string">"Home"</span>
+      }
+    }
+  }
+}
+</code></pre>
+<h3><a class="anchor" aria-hidden="true" id="get-lookup-1"></a><a href="#get-lookup-1" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Get lookup</h3>
+<p>A <code>GET</code> to the process at <code>/druid/listen/v1/lookups/some_lookup_name</code> will return the LookupExtractorFactory for the lookup identified by <code>some_lookup_name</code>.
+The return value will be the json representation of the factory.</p>
+<pre><code class="hljs css language-json">{
+  <span class="hljs-attr">"version"</span>: <span class="hljs-string">"v1"</span>,
+  <span class="hljs-attr">"lookupExtractorFactory"</span>: {
+    <span class="hljs-attr">"type"</span>: <span class="hljs-string">"map"</span>,
+    <span class="hljs-attr">"map"</span>: {
+      <span class="hljs-attr">"AHF77"</span>: <span class="hljs-string">"Home"</span>
+    }
+  }
+}
+</code></pre>
+<h2><a class="anchor" aria-hidden="true" id="configuration"></a><a href="#configuration" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Configuration</h2>
+<p>See <a href="/docs/0.20.0/configuration/index.html#lookups-dynamic-configuration">Lookups Dynamic Configuration</a> for Coordinator configuration.</p>
+<p>To configure a Broker / Router / Historical / Peon to announce itself as part of a lookup tier, use following properties.</p>
+<table>
+<thead>
+<tr><th>Property</th><th>Description</th><th>Default</th></tr>
+</thead>
+<tbody>
+<tr><td><code>druid.lookup.lookupTier</code></td><td>The tier for <strong>lookups</strong> for this process. This is independent of other tiers.</td><td><code>__default</code></td></tr>
+<tr><td><code>druid.lookup.lookupTierIsDatasource</code></td><td>For some things like indexing service tasks, the datasource is passed in the runtime properties of a task. This option fetches the tierName from the same value as the datasource for the task. It is suggested to only use this as Peon options for the indexing service, if at all. If true, <code>druid.lookup.lookupTier</code> MUST NOT be specified</td><td><code>&quot;false&quot;</code></td></tr>
+</tbody>
+</table>
+<p>To configure the behavior of the dynamic configuration manager, use the following properties on the Coordinator:</p>
+<table>
+<thead>
+<tr><th>Property</th><th>Description</th><th>Default</th></tr>
+</thead>
+<tbody>
+<tr><td><code>druid.manager.lookups.hostTimeout</code></td><td>Timeout (in ms) PER HOST for processing request</td><td><code>2000</code>(2 seconds)</td></tr>
+<tr><td><code>druid.manager.lookups.allHostTimeout</code></td><td>Timeout (in ms) to finish lookup management on all the processes.</td><td><code>900000</code>(15 mins)</td></tr>
+<tr><td><code>druid.manager.lookups.period</code></td><td>How long to pause between management cycles</td><td><code>120000</code>(2 mins)</td></tr>
+<tr><td><code>druid.manager.lookups.threadPoolSize</code></td><td>Number of service processes that can be managed concurrently</td><td><code>10</code></td></tr>
+</tbody>
+</table>
+<h2><a class="anchor" aria-hidden="true" id="saving-configuration-across-restarts"></a><a href="#saving-configuration-across-restarts" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Saving configuration across restarts</h2>
+<p>It is possible to save the configuration across restarts such that a process will not have to wait for Coordinator action to re-populate its lookups. To do this the following property is set:</p>
+<table>
+<thead>
+<tr><th>Property</th><th>Description</th><th>Default</th></tr>
+</thead>
+<tbody>
+<tr><td><code>druid.lookup.snapshotWorkingDir</code></td><td>Working path used to store snapshot of current lookup configuration, leaving this property null will disable snapshot/bootstrap utility</td><td>null</td></tr>
+<tr><td><code>druid.lookup.enableLookupSyncOnStartup</code></td><td>Enable the lookup synchronization process with Coordinator on startup. The queryable processes will fetch and load the lookups from the Coordinator instead of waiting for the Coordinator to load the lookups for them. Users may opt to disable this option if there are no lookups configured in the cluster.</td><td>true</td></tr>
+<tr><td><code>druid.lookup.numLookupLoadingThreads</code></td><td>Number of threads for loading the lookups in parallel on startup. This thread pool is destroyed once startup is done. It is not kept during the lifetime of the JVM</td><td>Available Processors / 2</td></tr>
+<tr><td><code>druid.lookup.coordinatorFetchRetries</code></td><td>How many times to retry to fetch the lookup bean list from Coordinator, during the sync on startup.</td><td>3</td></tr>
+<tr><td><code>druid.lookup.lookupStartRetries</code></td><td>How many times to retry to start each lookup, either during the sync on startup, or during the runtime.</td><td>3</td></tr>
+<tr><td><code>druid.lookup.coordinatorRetryDelay</code></td><td>How long to delay (in millis) between retries to fetch lookup list from the Coordinator during the sync on startup.</td><td>60_000</td></tr>
+</tbody>
+</table>
+<h2><a class="anchor" aria-hidden="true" id="introspect-a-lookup"></a><a href="#introspect-a-lookup" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Introspect a Lookup</h2>
+<p>The Broker provides an API for lookup introspection if the lookup type implements a <code>LookupIntrospectHandler</code>.</p>
+<p>A <code>GET</code> request to <code>/druid/v1/lookups/introspect/{lookupId}</code> will return the map of complete values.</p>
+<p>ex: <code>GET /druid/v1/lookups/introspect/nato-phonetic</code></p>
+<pre><code class="hljs">{
+    <span class="hljs-string">"A"</span>: <span class="hljs-string">"Alfa"</span>,
+    <span class="hljs-string">"B"</span>: <span class="hljs-string">"Bravo"</span>,
+    <span class="hljs-string">"C"</span>: <span class="hljs-string">"Charlie"</span>,
+    ...
+    <span class="hljs-string">"Y"</span>: <span class="hljs-string">"Yankee"</span>,
+    <span class="hljs-string">"Z"</span>: <span class="hljs-string">"Zulu"</span>,
+    <span class="hljs-string">"-"</span>: <span class="hljs-string">"Dash"</span>
+}
+
+</code></pre>
+<p>The list of keys can be retrieved via <code>GET</code> to <code>/druid/v1/lookups/introspect/{lookupId}/keys&quot;</code></p>
+<p>ex: <code>GET /druid/v1/lookups/introspect/nato-phonetic/keys</code></p>
+<pre><code class="hljs">[
+    <span class="hljs-string">"A"</span>,
+    <span class="hljs-string">"B"</span>,
+    <span class="hljs-string">"C"</span>,
+    ...
+    <span class="hljs-string">"Y"</span>,
+    <span class="hljs-string">"Z"</span>,
+    <span class="hljs-string">"-"</span>
+]
+</code></pre>
+<p>A <code>GET</code> request to <code>/druid/v1/lookups/introspect/{lookupId}/values&quot;</code> will return the list of values.</p>
+<p>ex: <code>GET /druid/v1/lookups/introspect/nato-phonetic/values</code></p>
+<pre><code class="hljs">[
+    <span class="hljs-string">"Alfa"</span>,
+    <span class="hljs-string">"Bravo"</span>,
+    <span class="hljs-string">"Charlie"</span>,
+    ...
+    <span class="hljs-string">"Yankee"</span>,
+    <span class="hljs-string">"Zulu"</span>,
+    <span class="hljs-string">"Dash"</span>
+]
+</code></pre>
+<h2><a class="anchor" aria-hidden="true" id="druid-version-0100-to-0101-upgradedowngrade"></a><a href="#druid-version-0100-to-0101-upgradedowngrade" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Druid version 0.10.0 to 0.10.1 upgrade/downgrade</h2>
+<p>Overall druid cluster lookups configuration is persisted in metadata store and also individual lookup processes optionally persist a snapshot of loaded lookups on disk.
+If upgrading from druid version 0.10.0 to 0.10.1, then migration for all persisted metadata is handled automatically.
+If downgrading from 0.10.1 to 0.9.0 then lookups updates done via Coordinator while 0.10.1 was running, would be lost.</p>
+</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/0.20.0/querying/joins.html"><span class="arrow-prev">← </span><span>Joins</span></a><a class="docs-next button" href="/docs/0.20.0/querying/multi-value-dimensions.html"><span>Multi-value dimensions</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#query-syntax">Query Syntax</a></li><li><a href="#query-execution">Query Execution</a></li><li><a href="#dynamic-configuration">Dynamic Configuration</a></li><li><a href="#configuration-propagation-behavior">Configuration propagation behavior</a></li><li><a href="#api-for-configuring-lookups">API for configuring lookups</a><ul class="toc-headings"><li><a href="#bulk-update">Bulk update</a></li><li><a href="#update-lookup">Update lookup</a></li><li><a href="#get-all-lookups">Get all lookups</a></li><li><a href="#get-lookup">Get lookup</a></li><li><a href="#delete-lookup">Delete lookup</a></li><li><a href="#delete-tier">Delete tier</a></li><li><a href="#list-tier-names">List tier names</a></li><li><a href="#list-lookup-names">List lookup names</a></li></ul></li><li><a href="#api-for-lookup-status">API for lookup status</a><ul class="toc-headings"><li><a href="#list-load-status-of-all-lookups">List load status of all lookups</a></li><li><a href="#list-load-status-of-lookups-in-a-tier">List load status of lookups in a tier</a></li><li><a href="#list-load-status-of-single-lookup">List load status of single lookup</a></li><li><a href="#list-lookup-state-of-all-processes">List lookup state of all processes</a></li><li><a href="#list-lookup-state-of-processes-in-a-tier">List lookup state of processes in a tier</a></li><li><a href="#list-lookup-state-of-single-process">List lookup state of single process</a></li></ul></li><li><a href="#internal-api">Internal API</a><ul class="toc-headings"><li><a href="#get-lookups">Get lookups</a></li><li><a href="#get-lookup-1">Get lookup</a></li></ul></li><li><a href="#configuration">Configuration</a></li><li><a href="#saving-configuration-across-restarts">Saving configuration across restarts</a></li><li><a href="#introspect-a-lookup">Introspect a Lookup</a></li><li><a href="#druid-version-0100-to-0101-upgradedowngrade">Druid version 0.10.0 to 0.10.1 upgrade/downgrade</a></li></ul></nav></div><footer class="nav-footer druid-footer" id="footer"><div class="container"><div class="text-center"><p><a href="/technology">Technology</a> · <a href="/use-cases">Use Cases</a> · <a href="/druid-powered">Powered by Druid</a> · <a href="/docs/0.20.0/latest">Docs</a> · <a href="/community/">Community</a> · <a href="/downloads.html">Download</a> · <a href="/faq">FAQ</a></p></div><div class="text-center"><a title="Join the user group" href="https://groups.google.com/forum/#!forum/druid-user" target="_blank"><span class="fa fa-comments"></span></a> · <a title="Follow Druid" href="https://twitter.com/druidio" target="_blank"><span class="fab fa-twitter"></span></a> · <a title="Download via Apache" href="https://www.apache.org/dyn/closer.cgi?path=/incubator/druid/{{ site.druid_versions[0].versions[0].version }}/apache-druid-{{ site.druid_versions[0].versions[0].version }}-bin.tar.gz" target="_blank"><span class="fas fa-feather"></span></a> · <a title="GitHub" href="https://github.com/apache/druid" target="_blank"><span class="fab fa-github"></span></a></div><div class="text-center license">Copyright © 2019 <a href="https://www.apache.org/" target="_blank">Apache Software Foundation</a>.<br/>Except where otherwise noted, licensed under <a rel="license" href="http://creativecommons.org/licenses/by-sa/4.0/">CC BY-SA 4.0</a>.<br/>Apache Druid, Druid, and the Druid logo are either registered trademarks or trademarks of The Apache Software Foundation in the United States and other countries.</div></div></footer></div><script type="text/javascript" src="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.js"></script><script>
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+<p>Apache Druid supports &quot;multi-value&quot; string dimensions. These are generated when an input field contains an
+array of values instead of a single value (e.g. JSON arrays, or a TSV field containing one or more <code>listDelimiter</code>
+characters).</p>
+<p>This document describes the behavior of groupBy (topN has similar behavior) queries on multi-value dimensions when they
+are used as a dimension being grouped by. See the section on multi-value columns in
+<a href="../design/segments.html#multi-value-columns">segments</a> for internal representation details. Examples in this document
+are in the form of <a href="querying.html">native Druid queries</a>. Refer to the <a href="sql.html">Druid SQL documentation</a> for details
+about using multi-value string dimensions in SQL.</p>
+<h2><a class="anchor" aria-hidden="true" id="querying-multi-value-dimensions"></a><a href="#querying-multi-value-dimensions" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Querying multi-value dimensions</h2>
+<p>Suppose, you have a dataSource with a segment that contains the following rows, with a multi-value dimension
+called <code>tags</code>.</p>
+<pre><code class="hljs">{<span class="hljs-string">"timestamp"</span>: <span class="hljs-string">"2011-01-12T00:00:00.000Z"</span>, <span class="hljs-string">"tags"</span>: [<span class="hljs-string">"t1"</span>,<span class="hljs-string">"t2"</span>,<span class="hljs-string">"t3"</span>]}  <span class="hljs-meta">#row1</span>
+{<span class="hljs-string">"timestamp"</span>: <span class="hljs-string">"2011-01-13T00:00:00.000Z"</span>, <span class="hljs-string">"tags"</span>: [<span class="hljs-string">"t3"</span>,<span class="hljs-string">"t4"</span>,<span class="hljs-string">"t5"</span>]}  <span class="hljs-meta">#row2</span>
+{<span class="hljs-string">"timestamp"</span>: <span class="hljs-string">"2011-01-14T00:00:00.000Z"</span>, <span class="hljs-string">"tags"</span>: [<span class="hljs-string">"t5"</span>,<span class="hljs-string">"t6"</span>,<span class="hljs-string">"t7"</span>]}  <span class="hljs-meta">#row3</span>
+{<span class="hljs-string">"timestamp"</span>: <span class="hljs-string">"2011-01-14T00:00:00.000Z"</span>, <span class="hljs-string">"tags"</span>: []}                <span class="hljs-meta">#row4</span>
+</code></pre>
+<h3><a class="anchor" aria-hidden="true" id="filtering"></a><a href="#filtering" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Filtering</h3>
+<p>All query types, as well as <a href="aggregations.html#filtered-aggregator">filtered aggregators</a>, can filter on multi-value
+dimensions. Filters follow these rules on multi-value dimensions:</p>
+<ul>
+<li>Value filters (like &quot;selector&quot;, &quot;bound&quot;, and &quot;in&quot;) match a row if any of the values of a multi-value dimension match
+the filter.</li>
+<li>The Column Comparison filter will match a row if the dimensions have any overlap.</li>
+<li>Value filters that match <code>null</code> or <code>&quot;&quot;</code> (empty string) will match empty cells in a multi-value dimension.</li>
+<li>Logical expression filters behave the same way they do on single-value dimensions: &quot;and&quot; matches a row if all
+underlying filters match that row; &quot;or&quot; matches a row if any underlying filters match that row; &quot;not&quot; matches a row
+if the underlying filter does not match the row.</li>
+</ul>
+<p>For example, this &quot;or&quot; filter would match row1 and row2 of the dataset above, but not row3:</p>
+<pre><code class="hljs">{
+  <span class="hljs-attr">"type"</span>: <span class="hljs-string">"or"</span>,
+  <span class="hljs-attr">"fields"</span>: [
+    {
+      <span class="hljs-attr">"type"</span>: <span class="hljs-string">"selector"</span>,
+      <span class="hljs-attr">"dimension"</span>: <span class="hljs-string">"tags"</span>,
+      <span class="hljs-attr">"value"</span>: <span class="hljs-string">"t1"</span>
+    },
+    {
+      <span class="hljs-attr">"type"</span>: <span class="hljs-string">"selector"</span>,
+      <span class="hljs-attr">"dimension"</span>: <span class="hljs-string">"tags"</span>,
+      <span class="hljs-attr">"value"</span>: <span class="hljs-string">"t3"</span>
+    }
+  ]
+}
+</code></pre>
+<p>This &quot;and&quot; filter would match only row1 of the dataset above:</p>
+<pre><code class="hljs">{
+  <span class="hljs-attr">"type"</span>: <span class="hljs-string">"and"</span>,
+  <span class="hljs-attr">"fields"</span>: [
+    {
+      <span class="hljs-attr">"type"</span>: <span class="hljs-string">"selector"</span>,
+      <span class="hljs-attr">"dimension"</span>: <span class="hljs-string">"tags"</span>,
+      <span class="hljs-attr">"value"</span>: <span class="hljs-string">"t1"</span>
+    },
+    {
+      <span class="hljs-attr">"type"</span>: <span class="hljs-string">"selector"</span>,
+      <span class="hljs-attr">"dimension"</span>: <span class="hljs-string">"tags"</span>,
+      <span class="hljs-attr">"value"</span>: <span class="hljs-string">"t3"</span>
+    }
+  ]
+}
+</code></pre>
+<p>This &quot;selector&quot; filter would match row4 of the dataset above:</p>
+<pre><code class="hljs">{
+  <span class="hljs-attr">"type"</span>: <span class="hljs-string">"selector"</span>,
+  <span class="hljs-attr">"dimension"</span>: <span class="hljs-string">"tags"</span>,
+  <span class="hljs-attr">"value"</span>: <span class="hljs-literal">null</span>
+}
+</code></pre>
+<h3><a class="anchor" aria-hidden="true" id="grouping"></a><a href="#grouping" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Grouping</h3>
+<p>topN and groupBy queries can group on multi-value dimensions. When grouping on a multi-value dimension, <em>all</em> values
+from matching rows will be used to generate one group per value. This can be thought of as the equivalent to the
+<code>UNNEST</code> operator used on an <code>ARRAY</code> type that many SQL dialects support. This means it's possible for a query to return
+more groups than there are rows. For example, a topN on the dimension <code>tags</code> with filter <code>&quot;t1&quot; AND &quot;t3&quot;</code> would match
+only row1, and generate a result with three groups: <code>t1</code>, <code>t2</code>, and <code>t3</code>. If you only need to include values that match
+your filter, you can use a <a href="dimensionspecs.html#filtered-dimensionspecs">filtered dimensionSpec</a>. This can also
+improve performance.</p>
+<h3><a class="anchor" aria-hidden="true" id="example-groupby-query-with-no-filtering"></a><a href="#example-groupby-query-with-no-filtering" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Example: GroupBy query with no filtering</h3>
+<p>See <a href="groupbyquery.html">GroupBy querying</a> for details.</p>
+<pre><code class="hljs css language-json">{
+  <span class="hljs-attr">"queryType"</span>: <span class="hljs-string">"groupBy"</span>,
+  <span class="hljs-attr">"dataSource"</span>: <span class="hljs-string">"test"</span>,
+  <span class="hljs-attr">"intervals"</span>: [
+    <span class="hljs-string">"1970-01-01T00:00:00.000Z/3000-01-01T00:00:00.000Z"</span>
+  ],
+  <span class="hljs-attr">"granularity"</span>: {
+    <span class="hljs-attr">"type"</span>: <span class="hljs-string">"all"</span>
+  },
+  <span class="hljs-attr">"dimensions"</span>: [
+    {
+      <span class="hljs-attr">"type"</span>: <span class="hljs-string">"default"</span>,
+      <span class="hljs-attr">"dimension"</span>: <span class="hljs-string">"tags"</span>,
+      <span class="hljs-attr">"outputName"</span>: <span class="hljs-string">"tags"</span>
+    }
+  ],
+  <span class="hljs-attr">"aggregations"</span>: [
+    {
+      <span class="hljs-attr">"type"</span>: <span class="hljs-string">"count"</span>,
+      <span class="hljs-attr">"name"</span>: <span class="hljs-string">"count"</span>
+    }
+  ]
+}
+</code></pre>
+<p>returns following result.</p>
+<pre><code class="hljs css language-json">[
+  {
+    <span class="hljs-attr">"timestamp"</span>: <span class="hljs-string">"1970-01-01T00:00:00.000Z"</span>,
+    <span class="hljs-attr">"event"</span>: {
+      <span class="hljs-attr">"count"</span>: <span class="hljs-number">1</span>,
+      <span class="hljs-attr">"tags"</span>: <span class="hljs-string">"t1"</span>
+    }
+  },
+  {
+    <span class="hljs-attr">"timestamp"</span>: <span class="hljs-string">"1970-01-01T00:00:00.000Z"</span>,
+    <span class="hljs-attr">"event"</span>: {
+      <span class="hljs-attr">"count"</span>: <span class="hljs-number">1</span>,
+      <span class="hljs-attr">"tags"</span>: <span class="hljs-string">"t2"</span>
+    }
+  },
+  {
+    <span class="hljs-attr">"timestamp"</span>: <span class="hljs-string">"1970-01-01T00:00:00.000Z"</span>,
+    <span class="hljs-attr">"event"</span>: {
+      <span class="hljs-attr">"count"</span>: <span class="hljs-number">2</span>,
+      <span class="hljs-attr">"tags"</span>: <span class="hljs-string">"t3"</span>
+    }
+  },
+  {
+    <span class="hljs-attr">"timestamp"</span>: <span class="hljs-string">"1970-01-01T00:00:00.000Z"</span>,
+    <span class="hljs-attr">"event"</span>: {
+      <span class="hljs-attr">"count"</span>: <span class="hljs-number">1</span>,
+      <span class="hljs-attr">"tags"</span>: <span class="hljs-string">"t4"</span>
+    }
+  },
+  {
+    <span class="hljs-attr">"timestamp"</span>: <span class="hljs-string">"1970-01-01T00:00:00.000Z"</span>,
+    <span class="hljs-attr">"event"</span>: {
+      <span class="hljs-attr">"count"</span>: <span class="hljs-number">2</span>,
+      <span class="hljs-attr">"tags"</span>: <span class="hljs-string">"t5"</span>
+    }
+  },
+  {
+    <span class="hljs-attr">"timestamp"</span>: <span class="hljs-string">"1970-01-01T00:00:00.000Z"</span>,
+    <span class="hljs-attr">"event"</span>: {
+      <span class="hljs-attr">"count"</span>: <span class="hljs-number">1</span>,
+      <span class="hljs-attr">"tags"</span>: <span class="hljs-string">"t6"</span>
+    }
+  },
+  {
+    <span class="hljs-attr">"timestamp"</span>: <span class="hljs-string">"1970-01-01T00:00:00.000Z"</span>,
+    <span class="hljs-attr">"event"</span>: {
+      <span class="hljs-attr">"count"</span>: <span class="hljs-number">1</span>,
+      <span class="hljs-attr">"tags"</span>: <span class="hljs-string">"t7"</span>
+    }
+  }
+]
+</code></pre>
+<p>notice how original rows are &quot;exploded&quot; into multiple rows and merged.</p>
+<h3><a class="anchor" aria-hidden="true" id="example-groupby-query-with-a-selector-query-filter"></a><a href="#example-groupby-query-with-a-selector-query-filter" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Example: GroupBy query with a selector query filter</h3>
+<p>See <a href="filters.html">query filters</a> for details of selector query filter.</p>
+<pre><code class="hljs css language-json">{
+  <span class="hljs-attr">"queryType"</span>: <span class="hljs-string">"groupBy"</span>,
+  <span class="hljs-attr">"dataSource"</span>: <span class="hljs-string">"test"</span>,
+  <span class="hljs-attr">"intervals"</span>: [
+    <span class="hljs-string">"1970-01-01T00:00:00.000Z/3000-01-01T00:00:00.000Z"</span>
+  ],
+  <span class="hljs-attr">"filter"</span>: {
+    <span class="hljs-attr">"type"</span>: <span class="hljs-string">"selector"</span>,
+    <span class="hljs-attr">"dimension"</span>: <span class="hljs-string">"tags"</span>,
+    <span class="hljs-attr">"value"</span>: <span class="hljs-string">"t3"</span>
+  },
+  <span class="hljs-attr">"granularity"</span>: {
+    <span class="hljs-attr">"type"</span>: <span class="hljs-string">"all"</span>
+  },
+  <span class="hljs-attr">"dimensions"</span>: [
+    {
+      <span class="hljs-attr">"type"</span>: <span class="hljs-string">"default"</span>,
+      <span class="hljs-attr">"dimension"</span>: <span class="hljs-string">"tags"</span>,
+      <span class="hljs-attr">"outputName"</span>: <span class="hljs-string">"tags"</span>
+    }
+  ],
+  <span class="hljs-attr">"aggregations"</span>: [
+    {
+      <span class="hljs-attr">"type"</span>: <span class="hljs-string">"count"</span>,
+      <span class="hljs-attr">"name"</span>: <span class="hljs-string">"count"</span>
+    }
+  ]
+}
+</code></pre>
+<p>returns following result.</p>
+<pre><code class="hljs css language-json">[
+  {
+    <span class="hljs-attr">"timestamp"</span>: <span class="hljs-string">"1970-01-01T00:00:00.000Z"</span>,
+    <span class="hljs-attr">"event"</span>: {
+      <span class="hljs-attr">"count"</span>: <span class="hljs-number">1</span>,
+      <span class="hljs-attr">"tags"</span>: <span class="hljs-string">"t1"</span>
+    }
+  },
+  {
+    <span class="hljs-attr">"timestamp"</span>: <span class="hljs-string">"1970-01-01T00:00:00.000Z"</span>,
+    <span class="hljs-attr">"event"</span>: {
+      <span class="hljs-attr">"count"</span>: <span class="hljs-number">1</span>,
+      <span class="hljs-attr">"tags"</span>: <span class="hljs-string">"t2"</span>
+    }
+  },
+  {
+    <span class="hljs-attr">"timestamp"</span>: <span class="hljs-string">"1970-01-01T00:00:00.000Z"</span>,
+    <span class="hljs-attr">"event"</span>: {
+      <span class="hljs-attr">"count"</span>: <span class="hljs-number">2</span>,
+      <span class="hljs-attr">"tags"</span>: <span class="hljs-string">"t3"</span>
+    }
+  },
+  {
+    <span class="hljs-attr">"timestamp"</span>: <span class="hljs-string">"1970-01-01T00:00:00.000Z"</span>,
+    <span class="hljs-attr">"event"</span>: {
+      <span class="hljs-attr">"count"</span>: <span class="hljs-number">1</span>,
+      <span class="hljs-attr">"tags"</span>: <span class="hljs-string">"t4"</span>
+    }
+  },
+  {
+    <span class="hljs-attr">"timestamp"</span>: <span class="hljs-string">"1970-01-01T00:00:00.000Z"</span>,
+    <span class="hljs-attr">"event"</span>: {
+      <span class="hljs-attr">"count"</span>: <span class="hljs-number">1</span>,
+      <span class="hljs-attr">"tags"</span>: <span class="hljs-string">"t5"</span>
+    }
+  }
+]
+</code></pre>
+<p>You might be surprised to see inclusion of &quot;t1&quot;, &quot;t2&quot;, &quot;t4&quot; and &quot;t5&quot; in the results. It happens because query filter is
+applied on the row before explosion. For multi-value dimensions, selector filter for &quot;t3&quot; would match row1 and row2,
+after which exploding is done. For multi-value dimensions, query filter matches a row if any individual value inside
+the multiple values matches the query filter.</p>
+<h3><a class="anchor" aria-hidden="true" id="example-groupby-query-with-a-selector-query-filter-and-additional-filter-in-dimensions-attributes"></a><a href="#example-groupby-query-with-a-selector-query-filter-and-additional-filter-in-dimensions-attributes" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Example: GroupBy query with a selector query filter and additional filter in &quot;dimensions&quot; attributes</h3>
+<p>To solve the problem above and to get only rows for &quot;t3&quot; returned, you would have to use a &quot;filtered dimension spec&quot; as
+in the query below.</p>
+<p>See section on filtered dimensionSpecs in <a href="dimensionspecs.html#filtered-dimensionspecs">dimensionSpecs</a> for details.</p>
+<pre><code class="hljs css language-json">{
+  <span class="hljs-attr">"queryType"</span>: <span class="hljs-string">"groupBy"</span>,
+  <span class="hljs-attr">"dataSource"</span>: <span class="hljs-string">"test"</span>,
+  <span class="hljs-attr">"intervals"</span>: [
+    <span class="hljs-string">"1970-01-01T00:00:00.000Z/3000-01-01T00:00:00.000Z"</span>
+  ],
+  <span class="hljs-attr">"filter"</span>: {
+    <span class="hljs-attr">"type"</span>: <span class="hljs-string">"selector"</span>,
+    <span class="hljs-attr">"dimension"</span>: <span class="hljs-string">"tags"</span>,
+    <span class="hljs-attr">"value"</span>: <span class="hljs-string">"t3"</span>
+  },
+  <span class="hljs-attr">"granularity"</span>: {
+    <span class="hljs-attr">"type"</span>: <span class="hljs-string">"all"</span>
+  },
+  <span class="hljs-attr">"dimensions"</span>: [
+    {
+      <span class="hljs-attr">"type"</span>: <span class="hljs-string">"listFiltered"</span>,
+      <span class="hljs-attr">"delegate"</span>: {
+        <span class="hljs-attr">"type"</span>: <span class="hljs-string">"default"</span>,
+        <span class="hljs-attr">"dimension"</span>: <span class="hljs-string">"tags"</span>,
+        <span class="hljs-attr">"outputName"</span>: <span class="hljs-string">"tags"</span>
+      },
+      <span class="hljs-attr">"values"</span>: [<span class="hljs-string">"t3"</span>]
+    }
+  ],
+  <span class="hljs-attr">"aggregations"</span>: [
+    {
+      <span class="hljs-attr">"type"</span>: <span class="hljs-string">"count"</span>,
+      <span class="hljs-attr">"name"</span>: <span class="hljs-string">"count"</span>
+    }
+  ]
+}
+</code></pre>
+<p>returns the following result.</p>
+<pre><code class="hljs css language-json">[
+  {
+    <span class="hljs-attr">"timestamp"</span>: <span class="hljs-string">"1970-01-01T00:00:00.000Z"</span>,
+    <span class="hljs-attr">"event"</span>: {
+      <span class="hljs-attr">"count"</span>: <span class="hljs-number">2</span>,
+      <span class="hljs-attr">"tags"</span>: <span class="hljs-string">"t3"</span>
+    }
+  }
+]
+</code></pre>
+<p>Note that, for groupBy queries, you could get similar result with a <a href="having.html">having spec</a> but using a filtered
+dimensionSpec is much more efficient because that gets applied at the lowest level in the query processing pipeline.
+Having specs are applied at the outermost level of groupBy query processing.</p>
+</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/0.20.0/querying/lookups.html"><span class="arrow-prev">← </span><span>Lookups</span></a><a class="docs-next button" href="/docs/0.20.0/querying/multitenancy.html"><span>Multitenancy</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#querying-multi-value-dimensions">Querying multi-value dimensions</a><ul class="toc-headings"><li><a href="#filtering">Filtering</a></li><li><a href="#grouping">Grouping</a></li><li><a href="#example-groupby-query-with-no-filtering">Example: GroupBy query with no filtering</a></li><li><a href="#example-groupby-query-with-a-selector-query-filter">Example: GroupBy query with a selector query filter</a></li><li><a href="#example-groupby-query-with-a-selector-query-filter-and-additional-filter-in-dimensions-attributes">Example: GroupBy query with a selector query filter and additional filter in &quot;dimensions&quot; attributes</a></li></ul></li></ul></nav></div><footer class="nav-footer druid-footer" id="footer"><div class="container"><div class="text-center"><p><a href="/technology">Technology</a> · <a href="/use-cases">Use Cases</a> · <a href="/druid-powered">Powered by Druid</a> · <a href="/docs/0.20.0/latest">Docs</a> · <a href="/community/">Community</a> · <a href="/downloads.html">Download</a> · <a href="/faq">FAQ</a></p></div><div class="text-center"><a title="Join the user group" href="https://groups.google.com/forum/#!forum/druid-user" target="_blank"><span class="fa fa-comments"></span></a> · <a title="Follow Druid" href="https://twitter.com/druidio" target="_blank"><span class="fab fa-twitter"></span></a> · <a title="Download via Apache" href="https://www.apache.org/dyn/closer.cgi?path=/incubator/druid/{{ site.druid_versions[0].versions[0].version }}/apache-druid-{{ site.druid_versions[0].versions[0].version }}-bin.tar.gz" target="_blank"><span class="fas fa-feather"></span></a> · <a title="GitHub" href="https://github.com/apache/druid" target="_blank"><span class="fab fa-github"></span></a></div><div class="text-center license">Copyright © 2019 <a href="https://www.apache.org/" target="_blank">Apache Software Foundation</a>.<br/>Except where otherwise noted, licensed under <a rel="license" href="http://creativecommons.org/licenses/by-sa/4.0/">CC BY-SA 4.0</a>.<br/>Apache Druid, Druid, and the Druid logo are either registered trademarks or trademarks of The Apache Software Foundation in the United States and other countries.</div></div></footer></div><script type="text/javascript" src="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.js"></script><script>
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+<p>Apache Druid is often used to power user-facing data applications, where multitenancy is an important requirement. This
+document outlines Druid's multitenant storage and querying features.</p>
+<h2><a class="anchor" aria-hidden="true" id="shared-datasources-or-datasource-per-tenant"></a><a href="#shared-datasources-or-datasource-per-tenant" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Shared datasources or datasource-per-tenant?</h2>
+<p>A datasource is the Druid equivalent of a database table. Multitenant workloads can either use a separate datasource
+for each tenant, or can share one or more datasources between tenants using a &quot;tenant_id&quot; dimension. When deciding
+which path to go down, consider that each path has pros and cons.</p>
+<p>Pros of datasources per tenant:</p>
+<ul>
+<li>Each datasource can have its own schema, its own backfills, its own partitioning rules, and its own data loading
+and expiration rules.</li>
+<li>Queries can be faster since there will be fewer segments to examine for a typical tenant's query.</li>
+<li>You get the most flexibility.</li>
+</ul>
+<p>Pros of shared datasources:</p>
+<ul>
+<li>Each datasource requires its own JVMs for realtime indexing.</li>
+<li>Each datasource requires its own YARN resources for Hadoop batch jobs.</li>
+<li>Each datasource requires its own segment files on disk.</li>
+<li>For these reasons it can be wasteful to have a very large number of small datasources.</li>
+</ul>
+<p>One compromise is to use more than one datasource, but a smaller number than tenants. For example, you could have some
+tenants with partitioning rules A and some with partitioning rules B; you could use two datasources and split your
+tenants between them.</p>
+<h2><a class="anchor" aria-hidden="true" id="partitioning-shared-datasources"></a><a href="#partitioning-shared-datasources" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Partitioning shared datasources</h2>
+<p>If your multitenant cluster uses shared datasources, most of your queries will likely filter on a &quot;tenant_id&quot;
+dimension. These sorts of queries perform best when data is well-partitioned by tenant. There are a few ways to
+accomplish this.</p>
+<p>With batch indexing, you can use <a href="../ingestion/hadoop.html#single-dimension-range-partitioning">single-dimension partitioning</a>
+to partition your data by tenant_id. Druid always partitions by time first, but the secondary partition within each
+time bucket will be on tenant_id.</p>
+<p>With realtime indexing, you'd do this by tweaking the stream you send to Druid. For example, if you're using Kafka then
+you can have your Kafka producer partition your topic by a hash of tenant_id.</p>
+<h2><a class="anchor" aria-hidden="true" id="customizing-data-distribution"></a><a href="#customizing-data-distribution" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Customizing data distribution</h2>
+<p>Druid additionally supports multitenancy by providing configurable means of distributing data. Druid's Historical processes
+can be configured into <a href="/docs/0.20.0/operations/rule-configuration.html">tiers</a>, and <a href="/docs/0.20.0/operations/rule-configuration.html">rules</a>
+can be set that determines which segments go into which tiers. One use case of this is that recent data tends to be accessed
+more frequently than older data. Tiering enables more recent segments to be hosted on more powerful hardware for better performance.
+A second copy of recent segments can be replicated on cheaper hardware (a different tier), and older segments can also be
+stored on this tier.</p>
+<h2><a class="anchor" aria-hidden="true" id="supporting-high-query-concurrency"></a><a href="#supporting-high-query-concurrency" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Supporting high query concurrency</h2>
+<p>Druid's fundamental unit of computation is a <a href="/docs/0.20.0/design/segments.html">segment</a>. Processes scan segments in parallel and a
+given process can scan <code>druid.processing.numThreads</code> concurrently. To
+process more data in parallel and increase performance, more cores can be added to a cluster. Druid segments
+should be sized such that any computation over any given segment should complete in at most 500ms.</p>
+<p>Druid internally stores requests to scan segments in a priority queue. If a given query requires scanning
+more segments than the total number of available processors in a cluster, and many similarly expensive queries are concurrently
+running, we don't want any query to be starved out. Druid's internal processing logic will scan a set of segments from one query and release resources as soon as the scans complete.
+This allows for a second set of segments from another query to be scanned. By keeping segment computation time very small, we ensure
+that resources are constantly being yielded, and segments pertaining to different queries are all being processed.</p>
+<p>Druid queries can optionally set a <code>priority</code> flag in the <a href="/docs/0.20.0/querying/query-context.html">query context</a>. Queries known to be
+slow (download or reporting style queries) can be de-prioritized and more interactive queries can have higher priority.</p>
+<p>Broker processes can also be dedicated to a given tier. For example, one set of Broker processes can be dedicated to fast interactive queries,
+and a second set of Broker processes can be dedicated to slower reporting queries. Druid also provides a <a href="/docs/0.20.0/design/router.html">Router</a>
+process that can route queries to different Brokers based on various query parameters (datasource, interval, etc.).</p>
+</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/0.20.0/querying/multi-value-dimensions.html"><span class="arrow-prev">← </span><span>Multi-value dimensions</span></a><a class="docs-next button" href="/docs/0.20.0/querying/caching.html"><span>Query caching</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#shared-datasources-or-datasource-per-tenant">Shared datasources or datasource-per-tenant?</a></li><li><a href="#partitioning-shared-datasources">Partitioning shared datasources</a></li><li><a href="#customizing-data-distribution">Customizing data distribution</a></li><li><a href="#supporting-high-query-concurrency">Supporting high query concurrency</a></li></ul></nav></div><footer class="nav-footer druid-footer" id="footer"><div class="container"><div class="text-center"><p><a href="/technology">Technology</a> · <a href="/use-cases">Use Cases</a> · <a href="/druid-powered">Powered by Druid</a> · <a href="/docs/0.20.0/latest">Docs</a> · <a href="/community/">Community</a> · <a href="/downloads.html">Download</a> · <a href="/faq">FAQ</a></p></div><div class="text-center"><a title="Join the user group" href="https://groups.google.com/forum/#!forum/druid-user" target="_blank"><span class="fa fa-comments"></span></a> · <a title="Follow Druid" href="https://twitter.com/druidio" target="_blank"><span class="fab fa-twitter"></span></a> · <a title="Download via Apache" href="https://www.apache.org/dyn/closer.cgi?path=/incubator/druid/{{ site.druid_versions[0].versions[0].version }}/apache-druid-{{ site.druid_versions[0].versions[0].version }}-bin.tar.gz" target="_blank"><span class="fas fa-feather"></span></a> · <a title="GitHub" href="https://github.com/apache/druid" target="_blank"><span class="fab fa-github"></span></a></div><div class="text-center license">Copyright © 2019 <a href="https://www.apache.org/" target="_blank">Apache Software Foundation</a>.<br/>Except where otherwise noted, licensed under <a rel="license" href="http://creativecommons.org/licenses/by-sa/4.0/">CC BY-SA 4.0</a>.<br/>Apache Druid, Druid, and the Druid logo are either registered trademarks or trademarks of The Apache Software Foundation in the United States and other countries.</div></div></footer></div><script type="text/javascript" src="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.js"></script><script>
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href="/docs/0.20.0/querying/sql.html">Druid SQL</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/querying/querying.html">Native queries</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/querying/query-execution.html">Query execution</a></li><div class="navGroup subNavGroup"><h4 class="navGroupSubcategoryTitle">Concepts</h4><ul><li class="navListItem"><a class="navItem" href="/docs/0.20.0/querying/datasource.html">Datasources</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/querying/joins.html">Joins</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/querying/lookups.html">Lookups</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/querying/multi-value-dimensions.html">Multi-value dimensions</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/querying/multitenancy.html">Multitenancy</a></li><li class="navListItem"><a class="navItem" 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href="/docs/0.20.0/operations/management-uis.html">Legacy Management UIs</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/operations/deep-storage-migration.html">Deep storage migration</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/operations/export-metadata.html">Export Metadata Tool</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/operations/metadata-migration.html">Metadata Migration</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/operations/segment-optimization.html">Segment Size Optimization</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/operations/use_sbt_to_build_fat_jar.html">Content for build.sbt</a></li></ul></div></ul></div><div class="navGroup"><h3 class="navGroupCategoryTitle collapsible">Development<span class="arrow"><svg width="24" height="24" viewBox="0 0 24 24"><path fill="#565656" d="M7.41 15.41L12 10.83l4.59 4.58L18 14l-6-6-6 6z"></path><path d="M0 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href="/docs/0.20.0/comparisons/druid-vs-redshift.html">Apache Druid vs Redshift</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/comparisons/druid-vs-spark.html">Apache Druid vs Spark</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/comparisons/druid-vs-sql-on-hadoop.html">Apache Druid vs SQL-on-Hadoop</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/design/auth.html">Authentication and Authorization</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/design/broker.html">Broker</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/design/coordinator.html">Coordinator Process</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/design/historical.html">Historical Process</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/design/indexer.html">Indexer Process</a></li><li class="navListItem"><a class="navItem" 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href="/docs/0.20.0/development/extensions-core/bloom-filter.html">Bloom Filter</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-core/datasketches-extension.html">DataSketches extension</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-core/datasketches-hll.html">DataSketches HLL Sketch module</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-core/datasketches-quantiles.html">DataSketches Quantiles Sketch module</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-core/datasketches-theta.html">DataSketches Theta Sketch module</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-core/datasketches-tuple.html">DataSketches Tuple Sketch module</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-core/druid-basic-security.html">Basic Security</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-core/druid-kerberos.html">Kerberos</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-core/druid-lookups.html">Cached Lookup Module</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-core/druid-ranger-security.html">Apache Ranger Security</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-core/google.html">Google Cloud Storage</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-core/hdfs.html">HDFS</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-core/kafka-extraction-namespace.html">Apache Kafka Lookups</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-core/lookups-cached-global.html">Globally Cached Lookups</a></li><li 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+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
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+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+  -->
+<blockquote>
+<p>Apache Druid supports two query languages: <a href="/docs/0.20.0/querying/sql.html">Druid SQL</a> and <a href="/docs/0.20.0/querying/querying.html">native queries</a>.
+This document describes the native
+language. For information about functions available in SQL, refer to the
+<a href="/docs/0.20.0/querying/sql.html#aggregation-functions">SQL documentation</a>.</p>
+</blockquote>
+<p>Post-aggregations are specifications of processing that should happen on aggregated values as they come out of Apache Druid. If you include a post aggregation as part of a query, make sure to include all aggregators the post-aggregator requires.</p>
+<p>There are several post-aggregators available.</p>
+<h3><a class="anchor" aria-hidden="true" id="arithmetic-post-aggregator"></a><a href="#arithmetic-post-aggregator" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Arithmetic post-aggregator</h3>
+<p>The arithmetic post-aggregator applies the provided function to the given
+fields from left to right. The fields can be aggregators or other post aggregators.</p>
+<p>Supported functions are <code>+</code>, <code>-</code>, <code>*</code>, <code>/</code>, and <code>quotient</code>.</p>
+<p><strong>Note</strong>:</p>
+<ul>
+<li><code>/</code> division always returns <code>0</code> if dividing by<code>0</code>, regardless of the numerator.</li>
+<li><code>quotient</code> division behaves like regular floating point division</li>
+</ul>
+<p>Arithmetic post-aggregators may also specify an <code>ordering</code>, which defines the order
+of resulting values when sorting results (this can be useful for topN queries for instance):</p>
+<ul>
+<li>If no ordering (or <code>null</code>) is specified, the default floating point ordering is used.</li>
+<li><code>numericFirst</code> ordering always returns finite values first, followed by <code>NaN</code>, and infinite values last.</li>
+</ul>
+<p>The grammar for an arithmetic post aggregation is:</p>
+<pre><code class="hljs css language-json">postAggregation : {
+  "type"  : "arithmetic",
+  "name"  : &lt;output_name&gt;,
+  "fn"    : &lt;arithmetic_function&gt;,
+  "fields": [&lt;post_aggregator&gt;, &lt;post_aggregator&gt;, ...],
+  "ordering" : &lt;null (default), or "numericFirst"&gt;
+}
+</code></pre>
+<h3><a class="anchor" aria-hidden="true" id="field-accessor-post-aggregators"></a><a href="#field-accessor-post-aggregators" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Field accessor post-aggregators</h3>
+<p>These post-aggregators return the value produced by the specified <a href="/docs/0.20.0/querying/aggregations.html">aggregator</a>.</p>
+<p><code>fieldName</code> refers to the output name of the aggregator given in the <a href="/docs/0.20.0/querying/aggregations.html">aggregations</a> portion of the query.
+For complex aggregators, like &quot;cardinality&quot; and &quot;hyperUnique&quot;, the <code>type</code> of the post-aggregator determines what
+the post-aggregator will return. Use type &quot;fieldAccess&quot; to return the raw aggregation object, or use type
+&quot;finalizingFieldAccess&quot; to return a finalized value, such as an estimated cardinality.</p>
+<pre><code class="hljs css language-json">{ <span class="hljs-attr">"type"</span> : <span class="hljs-string">"fieldAccess"</span>, <span class="hljs-attr">"name"</span>: &lt;output_name&gt;, <span class="hljs-attr">"fieldName"</span> : &lt;aggregator_name&gt; }
+</code></pre>
+<p>or</p>
+<pre><code class="hljs css language-json">{ <span class="hljs-attr">"type"</span> : <span class="hljs-string">"finalizingFieldAccess"</span>, <span class="hljs-attr">"name"</span>: &lt;output_name&gt;, <span class="hljs-attr">"fieldName"</span> : &lt;aggregator_name&gt; }
+</code></pre>
+<h3><a class="anchor" aria-hidden="true" id="constant-post-aggregator"></a><a href="#constant-post-aggregator" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Constant post-aggregator</h3>
+<p>The constant post-aggregator always returns the specified value.</p>
+<pre><code class="hljs css language-json">{ <span class="hljs-attr">"type"</span>  : <span class="hljs-string">"constant"</span>, <span class="hljs-attr">"name"</span>  : &lt;output_name&gt;, <span class="hljs-attr">"value"</span> : &lt;numerical_value&gt; }
+</code></pre>
+<h3><a class="anchor" aria-hidden="true" id="greatest--least-post-aggregators"></a><a href="#greatest--least-post-aggregators" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Greatest / Least post-aggregators</h3>
+<p><code>doubleGreatest</code> and <code>longGreatest</code> computes the maximum of all fields and Double.NEGATIVE_INFINITY.
+<code>doubleLeast</code> and <code>longLeast</code> computes the minimum of all fields and Double.POSITIVE_INFINITY.</p>
+<p>The difference between the <code>doubleMax</code> aggregator and the <code>doubleGreatest</code> post-aggregator is that <code>doubleMax</code> returns the highest value of
+all rows for one specific column while <code>doubleGreatest</code> returns the highest value of multiple columns in one row. These are similar to the
+SQL <a href="https://dev.mysql.com/doc/refman/5.7/en/group-by-functions.html#function_max">MAX</a> and
+<a href="https://dev.mysql.com/doc/refman/5.7/en/comparison-operators.html#function_greatest">GREATEST</a> functions.</p>
+<p>Example:</p>
+<pre><code class="hljs css language-json">{
+  <span class="hljs-attr">"type"</span>  : <span class="hljs-string">"doubleGreatest"</span>,
+  <span class="hljs-attr">"name"</span>  : &lt;output_name&gt;,
+  <span class="hljs-attr">"fields"</span>: [&lt;post_aggregator&gt;, &lt;post_aggregator&gt;, ...]
+}
+</code></pre>
+<h3><a class="anchor" aria-hidden="true" id="javascript-post-aggregator"></a><a href="#javascript-post-aggregator" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>JavaScript post-aggregator</h3>
+<p>Applies the provided JavaScript function to the given fields. Fields are passed as arguments to the JavaScript function in the given order.</p>
+<pre><code class="hljs css language-json">postAggregation : {
+  "type": "javascript",
+  "name": &lt;output_name&gt;,
+  "fieldNames" : [&lt;aggregator_name&gt;, &lt;aggregator_name&gt;, ...],
+  "function": &lt;javascript function&gt;
+}
+</code></pre>
+<p>Example JavaScript aggregator:</p>
+<pre><code class="hljs css language-json">{
+  <span class="hljs-attr">"type"</span>: <span class="hljs-string">"javascript"</span>,
+  <span class="hljs-attr">"name"</span>: <span class="hljs-string">"absPercent"</span>,
+  <span class="hljs-attr">"fieldNames"</span>: [<span class="hljs-string">"delta"</span>, <span class="hljs-string">"total"</span>],
+  <span class="hljs-attr">"function"</span>: <span class="hljs-string">"function(delta, total) { return 100 * Math.abs(delta) / total; }"</span>
+}
+</code></pre>
+<blockquote>
+<p>JavaScript-based functionality is disabled by default. Please refer to the Druid <a href="/docs/0.20.0/development/javascript.html">JavaScript programming guide</a> for guidelines about using Druid's JavaScript functionality, including instructions on how to enable it.</p>
+</blockquote>
+<h3><a class="anchor" aria-hidden="true" id="hyperunique-cardinality-post-aggregator"></a><a href="#hyperunique-cardinality-post-aggregator" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>HyperUnique Cardinality post-aggregator</h3>
+<p>The hyperUniqueCardinality post aggregator is used to wrap a hyperUnique object such that it can be used in post aggregations.</p>
+<pre><code class="hljs css language-json">{
+  <span class="hljs-attr">"type"</span>  : <span class="hljs-string">"hyperUniqueCardinality"</span>,
+  <span class="hljs-attr">"name"</span>: &lt;output name&gt;,
+  <span class="hljs-attr">"fieldName"</span>  : &lt;the name field value of the hyperUnique aggregator&gt;
+}
+</code></pre>
+<p>It can be used in a sample calculation as so:</p>
+<pre><code class="hljs css language-json">  "aggregations" : [{
+    {"type" : "count", "name" : "rows"},
+    {"type" : "hyperUnique", "name" : "unique_users", "fieldName" : "uniques"}
+  }],
+  "postAggregations" : [{
+    "type"   : "arithmetic",
+    "name"   : "average_users_per_row",
+    "fn"     : "/",
+    "fields" : [
+      { "type" : "hyperUniqueCardinality", "fieldName" : "unique_users" },
+      { "type" : "fieldAccess", "name" : "rows", "fieldName" : "rows" }
+    ]
+  }]
+</code></pre>
+<p>This post-aggregator will inherit the rounding behavior of the aggregator it references. Note that this inheritance
+is only effective if you directly reference an aggregator. Going through another post-aggregator, for example, will
+cause the user-specified rounding behavior to get lost and default to &quot;no rounding&quot;.</p>
+<h2><a class="anchor" aria-hidden="true" id="example-usage"></a><a href="#example-usage" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Example Usage</h2>
+<p>In this example, let’s calculate a simple percentage using post aggregators. Let’s imagine our data set has a metric called &quot;total&quot;.</p>
+<p>The format of the query JSON is as follows:</p>
+<pre><code class="hljs css language-json">{
+  ...
+  "aggregations" : [
+    { "type" : "count", "name" : "rows" },
+    { "type" : "doubleSum", "name" : "tot", "fieldName" : "total" }
+  ],
+  "postAggregations" : [{
+    "type"   : "arithmetic",
+    "name"   : "average",
+    "fn"     : "/",
+    "fields" : [
+           { "type" : "fieldAccess", "name" : "tot", "fieldName" : "tot" },
+           { "type" : "fieldAccess", "name" : "rows", "fieldName" : "rows" }
+         ]
+  }]
+  ...
+}
+</code></pre>
+<pre><code class="hljs css language-json">{
+  ...
+  "aggregations" : [
+    { "type" : "doubleSum", "name" : "tot", "fieldName" : "total" },
+    { "type" : "doubleSum", "name" : "part", "fieldName" : "part" }
+  ],
+  "postAggregations" : [{
+    "type"   : "arithmetic",
+    "name"   : "part_percentage",
+    "fn"     : "*",
+    "fields" : [
+       { "type"   : "arithmetic",
+         "name"   : "ratio",
+         "fn"     : "/",
+         "fields" : [
+           { "type" : "fieldAccess", "name" : "part", "fieldName" : "part" },
+           { "type" : "fieldAccess", "name" : "tot", "fieldName" : "tot" }
+         ]
+       },
+       { "type" : "constant", "name": "const", "value" : 100 }
+    ]
+  }]
+  ...
+}
+</code></pre>
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+<h2><a class="anchor" aria-hidden="true" id="general-parameters"></a><a href="#general-parameters" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>General parameters</h2>
+<p>The query context is used for various query configuration parameters. Query context parameters can be specified in
+the following ways:</p>
+<ul>
+<li>For <a href="/docs/0.20.0/querying/sql.html#client-apis">Druid SQL</a>, context parameters are provided either as a JSON object named <code>context</code> to the
+HTTP POST API, or as properties to the JDBC connection.</li>
+<li>For <a href="/docs/0.20.0/querying/querying.html">native queries</a>, context parameters are provided as a JSON object named <code>context</code>.</li>
+</ul>
+<p>Note that setting query context will override both the default value and the runtime properties value in the format of
+<code>druid.query.default.context.{property_key}</code> (if set).</p>
+<p>These parameters apply to all query types.</p>
+<table>
+<thead>
+<tr><th>property</th><th>default</th><th>description</th></tr>
+</thead>
+<tbody>
+<tr><td>timeout</td><td><code>druid.server.http.defaultQueryTimeout</code></td><td>Query timeout in millis, beyond which unfinished queries will be cancelled. 0 timeout means <code>no timeout</code>. To set the default timeout, see <a href="../configuration/index.html#broker">Broker configuration</a></td></tr>
+<tr><td>priority</td><td><code>0</code></td><td>Query Priority. Queries with higher priority get precedence for computational resources.</td></tr>
+<tr><td>lane</td><td><code>null</code></td><td>Query lane, used to control usage limits on classes of queries. See <a href="../configuration/index.html#broker">Broker configuration</a> for more details.</td></tr>
+<tr><td>queryId</td><td>auto-generated</td><td>Unique identifier given to this query. If a query ID is set or known, this can be used to cancel the query</td></tr>
+<tr><td>useCache</td><td><code>true</code></td><td>Flag indicating whether to leverage the query cache for this query. When set to false, it disables reading from the query cache for this query. When set to true, Apache Druid uses <code>druid.broker.cache.useCache</code> or <code>druid.historical.cache.useCache</code> to determine whether or not to read from the query cache</td></tr>
+<tr><td>populateCache</td><td><code>true</code></td><td>Flag indicating whether to save the results of the query to the query cache. Primarily used for debugging. When set to false, it disables saving the results of this query to the query cache. When set to true, Druid uses <code>druid.broker.cache.populateCache</code> or <code>druid.historical.cache.populateCache</code> to determine whether or not to save the results of this query to the query cache</td></tr>
+<tr><td>useResultLevelCache</td><td><code>true</code></td><td>Flag indicating whether to leverage the result level cache for this query. When set to false, it disables reading from the query cache for this query. When set to true, Druid uses <code>druid.broker.cache.useResultLevelCache</code> to determine whether or not to read from the result-level query cache</td></tr>
+<tr><td>populateResultLevelCache</td><td><code>true</code></td><td>Flag indicating whether to save the results of the query to the result level cache. Primarily used for debugging. When set to false, it disables saving the results of this query to the query cache. When set to true, Druid uses <code>druid.broker.cache.populateResultLevelCache</code> to determine whether or not to save the results of this query to the result-level query cache</td></tr>
+<tr><td>bySegment</td><td><code>false</code></td><td>Return &quot;by segment&quot; results. Primarily used for debugging, setting it to <code>true</code> returns results associated with the data segment they came from</td></tr>
+<tr><td>finalize</td><td><code>true</code></td><td>Flag indicating whether to &quot;finalize&quot; aggregation results. Primarily used for debugging. For instance, the <code>hyperUnique</code> aggregator will return the full HyperLogLog sketch instead of the estimated cardinality when this flag is set to <code>false</code></td></tr>
+<tr><td>maxScatterGatherBytes</td><td><code>druid.server.http.maxScatterGatherBytes</code></td><td>Maximum number of bytes gathered from data processes such as Historicals and realtime processes to execute a query. This parameter can be used to further reduce <code>maxScatterGatherBytes</code> limit at query time. See <a href="../configuration/index.html#broker">Broker configuration</a> for more details.</td></tr>
+<tr><td>maxQueuedBytes</td><td><code>druid.broker.http.maxQueuedBytes</code></td><td>Maximum number of bytes queued per query before exerting backpressure on the channel to the data server. Similar to <code>maxScatterGatherBytes</code>, except unlike that configuration, this one will trigger backpressure rather than query failure. Zero means disabled.</td></tr>
+<tr><td>serializeDateTimeAsLong</td><td><code>false</code></td><td>If true, DateTime is serialized as long in the result returned by Broker and the data transportation between Broker and compute process</td></tr>
+<tr><td>serializeDateTimeAsLongInner</td><td><code>false</code></td><td>If true, DateTime is serialized as long in the data transportation between Broker and compute process</td></tr>
+<tr><td>enableParallelMerge</td><td><code>true</code></td><td>Enable parallel result merging on the Broker. Note that <code>druid.processing.merge.useParallelMergePool</code> must be enabled for this setting to be set to <code>true</code>. See <a href="../configuration/index.html#broker">Broker configuration</a> for more details.</td></tr>
+<tr><td>parallelMergeParallelism</td><td><code>druid.processing.merge.pool.parallelism</code></td><td>Maximum number of parallel threads to use for parallel result merging on the Broker. See <a href="../configuration/index.html#broker">Broker configuration</a> for more details.</td></tr>
+<tr><td>parallelMergeInitialYieldRows</td><td><code>druid.processing.merge.task.initialYieldNumRows</code></td><td>Number of rows to yield per ForkJoinPool merge task for parallel result merging on the Broker, before forking off a new task to continue merging sequences. See <a href="../configuration/index.html#broker">Broker configuration</a> for more details.</td></tr>
+<tr><td>parallelMergeSmallBatchRows</td><td><code>druid.processing.merge.task.smallBatchNumRows</code></td><td>Size of result batches to operate on in ForkJoinPool merge tasks for parallel result merging on the Broker. See <a href="../configuration/index.html#broker">Broker configuration</a> for more details.</td></tr>
+<tr><td>useFilterCNF</td><td><code>false</code></td><td>If true, Druid will attempt to convert the query filter to Conjunctive Normal Form (CNF). During query processing, columns can be pre-filtered by intersecting the bitmap indexes of all values that match the eligible filters, often greatly reducing the raw number of rows which need to be scanned. But this effect only happens for the top level filter, or individual clauses of a top level 'and' filter. As such, filters in CNF potentially have a higher chance to utilize a large amount of bitmap indexes on string columns during pre-filtering. However, this setting should be used with great caution, as it can sometimes have a negative effect on performance, and in some cases, the act of computing CNF of a filter can be expensive. We recommend hand tuning your filters to produce an optimal form if possible, or at least verifying through experimentation that using this parameter actually improves your query performance with no ill-effects.</td></tr>
+<tr><td>secondaryPartitionPruning</td><td><code>true</code></td><td>Enable secondary partition pruning on the Broker. The Broker will always prune unnecessary segments from the input scan based on a filter on time intervals, but if the data is further partitioned with hash or range partitioning, this option will enable additional pruning based on a filter on secondary partition dimensions.</td></tr>
+</tbody>
+</table>
+<h2><a class="anchor" aria-hidden="true" id="query-type-specific-parameters"></a><a href="#query-type-specific-parameters" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Query-type-specific parameters</h2>
+<p>In addition, some query types offer context parameters specific to that query type.</p>
+<h3><a class="anchor" aria-hidden="true" id="topn"></a><a href="#topn" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>TopN</h3>
+<table>
+<thead>
+<tr><th>property</th><th>default</th><th>description</th></tr>
+</thead>
+<tbody>
+<tr><td>minTopNThreshold</td><td><code>1000</code></td><td>The top minTopNThreshold local results from each segment are returned for merging to determine the global topN.</td></tr>
+</tbody>
+</table>
+<h3><a class="anchor" aria-hidden="true" id="timeseries"></a><a href="#timeseries" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Timeseries</h3>
+<table>
+<thead>
+<tr><th>property</th><th>default</th><th>description</th></tr>
+</thead>
+<tbody>
+<tr><td>skipEmptyBuckets</td><td><code>false</code></td><td>Disable timeseries zero-filling behavior, so only buckets with results will be returned.</td></tr>
+</tbody>
+</table>
+<h3><a class="anchor" aria-hidden="true" id="groupby"></a><a href="#groupby" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>GroupBy</h3>
+<p>See the list of <a href="/docs/0.20.0/querying/groupbyquery.html#advanced-configurations">GroupBy query context</a> parameters available on the groupBy
+query page.</p>
+<h2><a class="anchor" aria-hidden="true" id="vectorization-parameters"></a><a href="#vectorization-parameters" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Vectorization parameters</h2>
+<p>The GroupBy and Timeseries query types can run in <em>vectorized</em> mode, which speeds up query execution by processing
+batches of rows at a time. Not all queries can be vectorized. In particular, vectorization currently has the following
+requirements:</p>
+<ul>
+<li>All query-level filters must either be able to run on bitmap indexes or must offer vectorized row-matchers. These
+include &quot;selector&quot;, &quot;bound&quot;, &quot;in&quot;, &quot;like&quot;, &quot;regex&quot;, &quot;search&quot;, &quot;and&quot;, &quot;or&quot;, and &quot;not&quot;.</li>
+<li>All filters in filtered aggregators must offer vectorized row-matchers.</li>
+<li>All aggregators must offer vectorized implementations. These include &quot;count&quot;, &quot;doubleSum&quot;, &quot;floatSum&quot;, &quot;longSum&quot;, &quot;longMin&quot;,
+&quot;longMax&quot;, &quot;doubleMin&quot;, &quot;doubleMax&quot;, &quot;floatMin&quot;, &quot;floatMax&quot;, &quot;longAny&quot;, &quot;doubleAny&quot;, &quot;floatAny&quot;, &quot;stringAny&quot;,
+&quot;hyperUnique&quot;, &quot;filtered&quot;, &quot;approxHistogram&quot;, &quot;approxHistogramFold&quot;, and &quot;fixedBucketsHistogram&quot; (with numerical input).</li>
+<li>All virtual columns must offer vectorized implementations. Currently for expression virtual columns, support for vectorization is decided on a per expression basis, depending on the type of input and the functions used by the expression. See the currently supported list in the <a href="/docs/0.20.0/misc/math-expr.html#vectorization-support">expression documentation</a>.</li>
+<li>For GroupBy: All dimension specs must be &quot;default&quot; (no extraction functions or filtered dimension specs).</li>
+<li>For GroupBy: No multi-value dimensions.</li>
+<li>For Timeseries: No &quot;descending&quot; order.</li>
+<li>Only immutable segments (not real-time).</li>
+<li>Only <a href="datasource.html#table">table datasources</a> (not joins, subqueries, lookups, or inline datasources).</li>
+</ul>
+<p>Other query types (like TopN, Scan, Select, and Search) ignore the &quot;vectorize&quot; parameter, and will execute without
+vectorization. These query types will ignore the &quot;vectorize&quot; parameter even if it is set to <code>&quot;force&quot;</code>.</p>
+<table>
+<thead>
+<tr><th>property</th><th>default</th><th>description</th></tr>
+</thead>
+<tbody>
+<tr><td>vectorize</td><td><code>true</code></td><td>Enables or disables vectorized query execution. Possible values are <code>false</code> (disabled), <code>true</code> (enabled if possible, disabled otherwise, on a per-segment basis), and <code>force</code> (enabled, and groupBy or timeseries queries that cannot be vectorized will fail). The <code>&quot;force&quot;</code> setting is meant to aid in testing, and is not generally useful in production (since real-time segments can never be processed with vectorized execution, any queries on real-time data will fail). This will override <code>druid.query.default.context.vectorize</code> if it's set.</td></tr>
+<tr><td>vectorSize</td><td><code>512</code></td><td>Sets the row batching size for a particular query. This will override <code>druid.query.default.context.vectorSize</code> if it's set.</td></tr>
+<tr><td>vectorizeVirtualColumns</td><td><code>false</code></td><td>Enables or disables vectorized query processing of queries with virtual columns, layered on top of <code>vectorize</code> (<code>vectorize</code> must also be set to true for a query to utilize vectorization). Possible values are <code>false</code> (disabled), <code>true</code> (enabled if possible, disabled otherwise, on a per-segment basis), and <code>force</code> (enabled, and groupBy or timeseries queries with virtual columns that cannot be vectorized will fail). The <code>&quot;force&quot;</code> setting is meant to aid in testing, and is not generally useful in production. This will override <code>druid.query.default.context.vectorizeVirtualColumns</code> if it's set.</td></tr>
+</tbody>
+</table>
+</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/0.20.0/querying/caching.html"><span class="arrow-prev">← </span><span>Query caching</span></a><a class="docs-next button" href="/docs/0.20.0/querying/timeseriesquery.html"><span>Timeseries</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#general-parameters">General parameters</a></li><li><a href="#query-type-specific-parameters">Query-type-specific parameters</a><ul class="toc-headings"><li><a href="#topn">TopN</a></li><li><a href="#timeseries">Timeseries</a></li><li><a href="#groupby">GroupBy</a></li></ul></li><li><a href="#vectorization-parameters">Vectorization parameters</a></li></ul></nav></div><footer class="nav-footer druid-footer" id="footer"><div class="container"><div class="text-center"><p><a href="/technology">Technology</a> · <a href="/use-cases">Use Cases</a> · <a href="/druid-powered">Powered by Druid</a> · <a href="/docs/0.20.0/latest">Docs</a> · <a href="/community/">Community</a> · <a href="/downloads.html">Download</a> · <a href="/faq">FAQ</a></p></div><div class="text-center"><a title="Join the user group" href="https://groups.google.com/forum/#!forum/druid-user" target="_blank"><span class="fa fa-comments"></span></a> · <a title="Follow Druid" href="https://twitter.com/druidio" target="_blank"><span class="fab fa-twitter"></span></a> · <a title="Download via Apache" href="https://www.apache.org/dyn/closer.cgi?path=/incubator/druid/{{ site.druid_versions[0].versions[0].version }}/apache-druid-{{ site.druid_versions[0].versions[0].version }}-bin.tar.gz" target="_blank"><span class="fas fa-feather"></span></a> · <a title="GitHub" href="https://github.com/apache/druid" target="_blank"><span class="fab fa-github"></span></a></div><div class="text-center license">Copyright © 2019 <a href="https://www.apache.org/" target="_blank">Apache Software Foundation</a>.<br/>Except where otherwise noted, licensed under <a rel="license" href="http://creativecommons.org/licenses/by-sa/4.0/">CC BY-SA 4.0</a>.<br/>Apache Druid, Druid, and the Druid logo are either registered trademarks or trademarks of The Apache Software Foundation in the United States and other countries.</div></div></footer></div><script type="text/javascript" src="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.js"></script><script>
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+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Query execution · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/0.20.0/querying/query-execution.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.20.0" /><meta property="og:title" content="Query execution · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
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+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
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+<blockquote>
+<p>This document describes how Druid executes <a href="/docs/0.20.0/querying/querying.html">native queries</a>, but since <a href="/docs/0.20.0/querying/sql.html">Druid SQL</a> queries
+are translated to native queries, this document applies to the SQL runtime as well. Refer to the SQL
+<a href="/docs/0.20.0/querying/sql.html#query-translation">Query translation</a> page for information about how SQL queries are translated to native
+queries.</p>
+</blockquote>
+<p>Druid's approach to query execution varies depending on the kind of <a href="/docs/0.20.0/querying/datasource.html">datasource</a> you are querying.</p>
+<h2><a class="anchor" aria-hidden="true" id="datasource-type"></a><a href="#datasource-type" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Datasource type</h2>
+<h3><a class="anchor" aria-hidden="true" id="table"></a><a href="#table" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a><code>table</code></h3>
+<p>Queries that operate directly on <a href="/docs/0.20.0/querying/datasource.html#table">table datasources</a> are executed using a scatter-gather approach
+led by the Broker process. The process looks like this:</p>
+<ol>
+<li><p>The Broker identifies which <a href="/docs/0.20.0/design/segments.html">segments</a> are relevant to the query based on the <code>&quot;intervals&quot;</code>
+parameter. Segments are always partitioned by time, so any segment whose interval overlaps the query interval is
+potentially relevant.</p></li>
+<li><p>The Broker may additionally further prune the segment list based on the <code>&quot;filter&quot;</code>, if the input data was partitioned
+by range using the <a href="/docs/0.20.0/ingestion/native-batch.html#partitionsspec"><code>single_dim</code> partitionsSpec</a>, and if the filter matches
+the dimension used for partitioning.</p></li>
+<li><p>The Broker, having pruned the list of segments for the query, forwards the query to data servers (like Historicals
+and tasks running on MiddleManagers) that are currently serving those segments.</p></li>
+<li><p>For all query types except <a href="/docs/0.20.0/querying/scan-query.html">Scan</a>, data servers process each segment in parallel and generate partial
+results for each segment. The specific processing that is done depends on the query type. These partial results may be
+cached if <a href="/docs/0.20.0/querying/caching.html">query caching</a> is enabled. For Scan queries, segments are processed in order by a single thread,
+and results are not cached.</p></li>
+<li><p>The Broker receives partial results from each data server, merges them into the final result set, and returns them
+to the caller. For Timeseries and Scan queries, and for GroupBy queries where there is no sorting, the Broker is able to
+do this in a streaming fashion. Otherwise, the Broker fully computes the result set before returning anything.</p></li>
+</ol>
+<h3><a class="anchor" aria-hidden="true" id="lookup"></a><a href="#lookup" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a><code>lookup</code></h3>
+<p>Queries that operate directly on <a href="/docs/0.20.0/querying/datasource.html#lookup">lookup datasources</a> (without a join) are executed on the Broker
+that received the query, using its local copy of the lookup. All registered lookup tables are preloaded in-memory on the
+Broker. The query runs single-threaded.</p>
+<p>Execution of queries that use lookups as right-hand inputs to a join are executed in a way that depends on their
+&quot;base&quot; (bottom-leftmost) datasource, as described in the <a href="#join">join</a> section below.</p>
+<h3><a class="anchor" aria-hidden="true" id="union"></a><a href="#union" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a><code>union</code></h3>
+<p>Queries that operate directly on <a href="/docs/0.20.0/querying/datasource.html#union">union datasources</a> are split up on the Broker into a separate
+query for each table that is part of the union. Each of these queries runs separately, and the Broker merges their
+results together.</p>
+<h3><a class="anchor" aria-hidden="true" id="inline"></a><a href="#inline" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a><code>inline</code></h3>
+<p>Queries that operate directly on <a href="/docs/0.20.0/querying/datasource.html#inline">inline datasources</a> are executed on the Broker that received the
+query. The query runs single-threaded.</p>
+<p>Execution of queries that use inline datasources as right-hand inputs to a join are executed in a way that depends on
+their &quot;base&quot; (bottom-leftmost) datasource, as described in the <a href="#join">join</a> section below.</p>
+<h3><a class="anchor" aria-hidden="true" id="query"></a><a href="#query" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a><code>query</code></h3>
+<p><a href="/docs/0.20.0/querying/datasource.html#query">Query datasources</a> are subqueries. Each subquery is executed as if it was its own query and
+the results are brought back to the Broker. Then, the Broker continues on with the rest of the query as if the subquery
+was replaced with an inline datasource.</p>
+<p>In most cases, subquery results are fully buffered in memory on the Broker before the rest of the query proceeds,
+meaning subqueries execute sequentially. The total number of rows buffered across all subqueries of a given query
+in this way cannot exceed the <a href="/docs/0.20.0/configuration/index.html"><code>druid.server.http.maxSubqueryRows</code> property</a>.</p>
+<p>There is one exception: if the outer query and all subqueries are the <a href="/docs/0.20.0/querying/groupbyquery.html">groupBy</a> type, then subquery
+results can be processed in a streaming fashion and the <code>druid.server.http.maxSubqueryRows</code> limit does not apply.</p>
+<h3><a class="anchor" aria-hidden="true" id="join"></a><a href="#join" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a><code>join</code></h3>
+<p><a href="/docs/0.20.0/querying/datasource.html#join">Join datasources</a> are handled using a broadcast hash-join approach.</p>
+<ol>
+<li><p>The Broker executes any subqueries that are inputs the join, as described in the <a href="#query">query</a> section, and
+replaces them with inline datasources.</p></li>
+<li><p>The Broker flattens a join tree, if present, into a &quot;base&quot; datasource (the bottom-leftmost one) and other leaf
+datasources (the rest).</p></li>
+<li><p>Query execution proceeds using the same structure that the base datasource would use on its own. If the base
+datasource is a <a href="#table">table</a>, segments are pruned based on <code>&quot;intervals&quot;</code> as usual, and the query is executed on the
+cluster by forwarding it to all relevant data servers in parallel. If the base datasource is a <a href="#lookup">lookup</a> or
+<a href="#inline">inline</a> datasource (including an inline datasource that was the result of inlining a subquery), the query is
+executed on the Broker itself. The base query cannot be a union, because unions are not currently supported as inputs to
+a join.</p></li>
+<li><p>Before beginning to process the base datasource, the server(s) that will execute the query first inspect all the
+non-base leaf datasources to determine if a new hash table needs to be built for the upcoming hash join. Currently,
+lookups do not require new hash tables to be built (because they are preloaded), but inline datasources do.</p></li>
+<li><p>Query execution proceeds again using the same structure that the base datasource would use on its own, with one
+addition: while processing the base datasource, Druid servers will use the hash tables built from the other join inputs
+to produce the join result row-by-row, and query engines will operate on the joined rows rather than the base rows.</p></li>
+</ol>
+</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/0.20.0/querying/querying.html"><span class="arrow-prev">← </span><span>Native queries</span></a><a class="docs-next button" href="/docs/0.20.0/querying/datasource.html"><span>Datasources</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#datasource-type">Datasource type</a><ul class="toc-headings"><li><a href="#table"><code>table</code></a></li><li><a href="#lookup"><code>lookup</code></a></li><li><a href="#union"><code>union</code></a></li><li><a href="#inline"><code>inline</code></a></li><li><a href="#query"><code>query</code></a></li><li><a href="#join"><code>join</code></a></li></ul></li></ul></nav></div><footer class="nav-footer druid-footer" id="footer"><div class="container"><div class="text-center"><p><a href="/technology">Technology</a> · <a href="/use-cases">Use Cases</a> · <a href="/druid-powered">Powered by Druid</a> · <a href="/docs/0.20.0/latest">Docs</a> · <a href="/community/">Community</a> · <a href="/downloads.html">Download</a> · <a href="/faq">FAQ</a></p></div><div class="text-center"><a title="Join the user group" href="https://groups.google.com/forum/#!forum/druid-user" target="_blank"><span class="fa fa-comments"></span></a> · <a title="Follow Druid" href="https://twitter.com/druidio" target="_blank"><span class="fab fa-twitter"></span></a> · <a title="Download via Apache" href="https://www.apache.org/dyn/closer.cgi?path=/incubator/druid/{{ site.druid_versions[0].versions[0].version }}/apache-druid-{{ site.druid_versions[0].versions[0].version }}-bin.tar.gz" target="_blank"><span class="fas fa-feather"></span></a> · <a title="GitHub" href="https://github.com/apache/druid" target="_blank"><span class="fab fa-github"></span></a></div><div class="text-center license">Copyright © 2019 <a href="https://www.apache.org/" target="_blank">Apache Software Foundation</a>.<br/>Except where otherwise noted, licensed under <a rel="license" href="http://creativecommons.org/licenses/by-sa/4.0/">CC BY-SA 4.0</a>.<br/>Apache Druid, Druid, and the Druid logo are either registered trademarks or trademarks of The Apache Software Foundation in the United States and other countries.</div></div></footer></div><script type="text/javascript" src="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.js"></script><script>
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+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Native queries · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/0.20.0/querying/querying.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.20.0" /><meta property="og:title" content="Native queries · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
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+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
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+<blockquote>
+<p>Apache Druid supports two query languages: <a href="/docs/0.20.0/querying/sql.html">Druid SQL</a> and <a href="/docs/0.20.0/querying/querying.html">native queries</a>.
+This document describes the
+native query language. For information about how Druid SQL chooses which native query types to use when
+it runs a SQL query, refer to the <a href="/docs/0.20.0/querying/sql.html#query-types">SQL documentation</a>.</p>
+</blockquote>
+<p>Native queries in Druid are JSON objects and are typically issued to the Broker or Router processes. Queries can be
+posted like this:</p>
+<pre><code class="hljs css language-bash">curl -X POST <span class="hljs-string">'&lt;queryable_host&gt;:&lt;port&gt;/druid/v2/?pretty'</span> -H <span class="hljs-string">'Content-Type:application/json'</span> -H <span class="hljs-string">'Accept:application/json'</span> -d @&lt;query_json_file&gt;
+</code></pre>
+<blockquote>
+<p>Replace <code>&lt;queryable_host&gt;:&lt;port&gt;</code> with the appropriate address and port for your system. For example, if running the quickstart configuration, replace <code>&lt;queryable_host&gt;:&lt;port&gt;</code> with localhost:8888.</p>
+</blockquote>
+<p>You can also enter them directly in the Druid console's Query view. Simply pasting a native query into the console switches the editor into JSON mode.</p>
+<p><img src="../assets/native-queries-01.png" alt="Native query" title="Native query"></p>
+<p>Druid's native query language is JSON over HTTP, although many members of the community have contributed different
+<a href="/libraries.html">client libraries</a> in other languages to query Druid.</p>
+<p>The Content-Type/Accept Headers can also take 'application/x-jackson-smile'.</p>
+<pre><code class="hljs css language-bash">curl -X POST <span class="hljs-string">'&lt;queryable_host&gt;:&lt;port&gt;/druid/v2/?pretty'</span> -H <span class="hljs-string">'Content-Type:application/json'</span> -H <span class="hljs-string">'Accept:application/x-jackson-smile'</span> -d @&lt;query_json_file&gt;
+</code></pre>
+<blockquote>
+<p>If the Accept header is not provided, it defaults to the value of 'Content-Type' header.</p>
+</blockquote>
+<p>Druid's native query is relatively low level, mapping closely to how computations are performed internally. Druid queries
+are designed to be lightweight and complete very quickly. This means that for more complex analysis, or to build
+more complex visualizations, multiple Druid queries may be required.</p>
+<p>Even though queries are typically made to Brokers or Routers, they can also be accepted by
+<a href="/docs/0.20.0/design/historical.html">Historical</a> processes and by <a href="/docs/0.20.0/design/peons.html">Peons (task JVMs)</a>) that are running
+stream ingestion tasks. This may be valuable if you want to query results for specific segments that are served by
+specific processes.</p>
+<h2><a class="anchor" aria-hidden="true" id="available-queries"></a><a href="#available-queries" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Available queries</h2>
+<p>Druid has numerous query types for various use cases. Queries are composed of various JSON properties and Druid has different types of queries for different use cases. The documentation for the various query types describe all the JSON properties that can be set.</p>
+<h3><a class="anchor" aria-hidden="true" id="aggregation-queries"></a><a href="#aggregation-queries" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Aggregation queries</h3>
+<ul>
+<li><a href="/docs/0.20.0/querying/timeseriesquery.html">Timeseries</a></li>
+<li><a href="/docs/0.20.0/querying/topnquery.html">TopN</a></li>
+<li><a href="/docs/0.20.0/querying/groupbyquery.html">GroupBy</a></li>
+</ul>
+<h3><a class="anchor" aria-hidden="true" id="metadata-queries"></a><a href="#metadata-queries" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Metadata queries</h3>
+<ul>
+<li><a href="/docs/0.20.0/querying/timeboundaryquery.html">TimeBoundary</a></li>
+<li><a href="/docs/0.20.0/querying/segmentmetadataquery.html">SegmentMetadata</a></li>
+<li><a href="/docs/0.20.0/querying/datasourcemetadataquery.html">DatasourceMetadata</a></li>
+</ul>
+<h3><a class="anchor" aria-hidden="true" id="other-queries"></a><a href="#other-queries" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Other queries</h3>
+<ul>
+<li><a href="/docs/0.20.0/querying/scan-query.html">Scan</a></li>
+<li><a href="/docs/0.20.0/querying/searchquery.html">Search</a></li>
+</ul>
+<h2><a class="anchor" aria-hidden="true" id="which-query-type-should-i-use"></a><a href="#which-query-type-should-i-use" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Which query type should I use?</h2>
+<p>For aggregation queries, if more than one would satisfy your needs, we generally recommend using Timeseries or TopN
+whenever possible, as they are specifically optimized for their use cases. If neither is a good fit, you should use
+the GroupBy query, which is the most flexible.</p>
+<h2><a class="anchor" aria-hidden="true" id="query-cancellation"></a><a href="#query-cancellation" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Query cancellation</h2>
+<p>Queries can be cancelled explicitly using their unique identifier.  If the
+query identifier is set at the time of query, or is otherwise known, the following
+endpoint can be used on the Broker or Router to cancel the query.</p>
+<pre><code class="hljs css language-sh">DELETE /druid/v2/{queryId}
+</code></pre>
+<p>For example, if the query ID is <code>abc123</code>, the query can be cancelled as follows:</p>
+<pre><code class="hljs css language-sh">curl -X DELETE <span class="hljs-string">"http://host:port/druid/v2/abc123"</span>
+</code></pre>
+<h2><a class="anchor" aria-hidden="true" id="query-errors"></a><a href="#query-errors" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Query errors</h2>
+<p>If a query fails, you will get an HTTP 500 response containing a JSON object with the following structure:</p>
+<pre><code class="hljs css language-json">{
+  <span class="hljs-attr">"error"</span> : <span class="hljs-string">"Query timeout"</span>,
+  <span class="hljs-attr">"errorMessage"</span> : <span class="hljs-string">"Timeout waiting for task."</span>,
+  <span class="hljs-attr">"errorClass"</span> : <span class="hljs-string">"java.util.concurrent.TimeoutException"</span>,
+  <span class="hljs-attr">"host"</span> : <span class="hljs-string">"druid1.example.com:8083"</span>
+}
+</code></pre>
+<p>If a query request fails due to being limited by the <a href="/docs/0.20.0/configuration/index.html#broker">query scheduler laning configuration</a>, an HTTP 429 response with the same JSON object schema as an error response, but with <code>errorMessage</code> of the form: &quot;Total query capacity exceeded&quot; or &quot;Query capacity exceeded for lane 'low'&quot;.</p>
+<p>The fields in the response are:</p>
+<table>
+<thead>
+<tr><th>field</th><th>description</th></tr>
+</thead>
+<tbody>
+<tr><td>error</td><td>A well-defined error code (see below).</td></tr>
+<tr><td>errorMessage</td><td>A free-form message with more information about the error. May be null.</td></tr>
+<tr><td>errorClass</td><td>The class of the exception that caused this error. May be null.</td></tr>
+<tr><td>host</td><td>The host on which this error occurred. May be null.</td></tr>
+</tbody>
+</table>
+<p>Possible codes for the <em>error</em> field include:</p>
+<table>
+<thead>
+<tr><th>code</th><th>description</th></tr>
+</thead>
+<tbody>
+<tr><td><code>Query timeout</code></td><td>The query timed out.</td></tr>
+<tr><td><code>Query interrupted</code></td><td>The query was interrupted, possibly due to JVM shutdown.</td></tr>
+<tr><td><code>Query cancelled</code></td><td>The query was cancelled through the query cancellation API.</td></tr>
+<tr><td><code>Resource limit exceeded</code></td><td>The query exceeded a configured resource limit (e.g. groupBy maxResults).</td></tr>
+<tr><td><code>Unauthorized request.</code></td><td>The query was denied due to security policy. Either the user was not recognized, or the user was recognized but does not have access to the requested resource.</td></tr>
+<tr><td><code>Unsupported operation</code></td><td>The query attempted to perform an unsupported operation. This may occur when using undocumented features or when using an incompletely implemented extension.</td></tr>
+<tr><td><code>Truncated response context</code></td><td>An intermediate response context for the query exceeded the built-in limit of 7KB.<br/><br/>The response context is an internal data structure that Druid servers use to share out-of-band information when sending query results to each other. It is serialized in an HTTP header with a maximum length of 7KB. This error occurs when an intermediate response context sent from a data server (like a Historical) to the Broker exceeds this limit.<br/><br/>The response context is used for a variety of purposes, but the one most likely to generate a large context is sharing details about segments that move during a query. That means this error can potentially indicate that a very large number of segments moved in between the time a Broker issued a query and the time it was processed on Historicals. This should rarely, if ever, occur during normal operation.</td></tr>
+<tr><td><code>Unknown exception</code></td><td>Some other exception occurred. Check errorMessage and errorClass for details, although keep in mind that the contents of those fields are free-form and may change from release to release.</td></tr>
+</tbody>
+</table>
+</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/0.20.0/querying/sql.html"><span class="arrow-prev">← </span><span>Druid SQL</span></a><a class="docs-next button" href="/docs/0.20.0/querying/query-execution.html"><span>Query execution</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#available-queries">Available queries</a><ul class="toc-headings"><li><a href="#aggregation-queries">Aggregation queries</a></li><li><a href="#metadata-queries">Metadata queries</a></li><li><a href="#other-queries">Other queries</a></li></ul></li><li><a href="#which-query-type-should-i-use">Which query type should I use?</a></li><li><a href="#query-cancellation">Query cancellation</a></li><li><a href="#query-errors">Query errors</a></li></ul></nav></div><footer class="nav-footer druid-footer" id="footer"><div class="container"><div class="text-center"><p><a href="/technology">Technology</a> · <a href="/use-cases">Use Cases</a> · <a href="/druid-powered">Powered by Druid</a> · <a href="/docs/0.20.0/latest">Docs</a> · <a href="/community/">Community</a> · <a href="/downloads.html">Download</a> · <a href="/faq">FAQ</a></p></div><div class="text-center"><a title="Join the user group" href="https://groups.google.com/forum/#!forum/druid-user" target="_blank"><span class="fa fa-comments"></span></a> · <a title="Follow Druid" href="https://twitter.com/druidio" target="_blank"><span class="fab fa-twitter"></span></a> · <a title="Download via Apache" href="https://www.apache.org/dyn/closer.cgi?path=/incubator/druid/{{ site.druid_versions[0].versions[0].version }}/apache-druid-{{ site.druid_versions[0].versions[0].version }}-bin.tar.gz" target="_blank"><span class="fas fa-feather"></span></a> · <a title="GitHub" href="https://github.com/apache/druid" target="_blank"><span class="fab fa-github"></span></a></div><div class="text-center license">Copyright © 2019 <a href="https://www.apache.org/" target="_blank">Apache Software Foundation</a>.<br/>Except where otherwise noted, licensed under <a rel="license" href="http://creativecommons.org/licenses/by-sa/4.0/">CC BY-SA 4.0</a>.<br/>Apache Druid, Druid, and the Druid logo are either registered trademarks or trademarks of The Apache Software Foundation in the United States and other countries.</div></div></footer></div><script type="text/javascript" src="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.js"></script><script>
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@@ -0,0 +1,291 @@
+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Scan queries · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/0.20.0/querying/scan-query.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.20.0" /><meta property="og:title" content="Scan queries · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
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+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+  -->
+<blockquote>
+<p>Apache Druid supports two query languages: <a href="/docs/0.20.0/querying/sql.html">Druid SQL</a> and <a href="/docs/0.20.0/querying/querying.html">native queries</a>.
+This document describes a query
+type in the native language. For information about when Druid SQL will use this query type, refer to the
+<a href="/docs/0.20.0/querying/sql.html#query-types">SQL documentation</a>.</p>
+</blockquote>
+<p>The Scan query returns raw Apache Druid rows in streaming mode.</p>
+<p>In addition to straightforward usage where a Scan query is issued to the Broker, the Scan query can also be issued
+directly to Historical processes or streaming ingestion tasks. This can be useful if you want to retrieve large
+amounts of data in parallel.</p>
+<p>An example Scan query object is shown below:</p>
+<pre><code class="hljs css language-json"> {
+   <span class="hljs-attr">"queryType"</span>: <span class="hljs-string">"scan"</span>,
+   <span class="hljs-attr">"dataSource"</span>: <span class="hljs-string">"wikipedia"</span>,
+   <span class="hljs-attr">"resultFormat"</span>: <span class="hljs-string">"list"</span>,
+   <span class="hljs-attr">"columns"</span>:[],
+   <span class="hljs-attr">"intervals"</span>: [
+     <span class="hljs-string">"2013-01-01/2013-01-02"</span>
+   ],
+   <span class="hljs-attr">"batchSize"</span>:<span class="hljs-number">20480</span>,
+   <span class="hljs-attr">"limit"</span>:<span class="hljs-number">3</span>
+ }
+</code></pre>
+<p>The following are the main parameters for Scan queries:</p>
+<table>
+<thead>
+<tr><th>property</th><th>description</th><th>required?</th></tr>
+</thead>
+<tbody>
+<tr><td>queryType</td><td>This String should always be &quot;scan&quot;; this is the first thing Druid looks at to figure out how to interpret the query</td><td>yes</td></tr>
+<tr><td>dataSource</td><td>A String or Object defining the data source to query, very similar to a table in a relational database. See <a href="/docs/0.20.0/querying/datasource.html">DataSource</a> for more information.</td><td>yes</td></tr>
+<tr><td>intervals</td><td>A JSON Object representing ISO-8601 Intervals. This defines the time ranges to run the query over.</td><td>yes</td></tr>
+<tr><td>resultFormat</td><td>How the results are represented: list, compactedList or valueVector. Currently only <code>list</code> and <code>compactedList</code> are supported. Default is <code>list</code></td><td>no</td></tr>
+<tr><td>filter</td><td>See <a href="/docs/0.20.0/querying/filters.html">Filters</a></td><td>no</td></tr>
+<tr><td>columns</td><td>A String array of dimensions and metrics to scan. If left empty, all dimensions and metrics are returned.</td><td>no</td></tr>
+<tr><td>batchSize</td><td>The maximum number of rows buffered before being returned to the client. Default is <code>20480</code></td><td>no</td></tr>
+<tr><td>limit</td><td>How many rows to return. If not specified, all rows will be returned.</td><td>no</td></tr>
+<tr><td>offset</td><td>Skip this many rows when returning results. Skipped rows will still need to be generated internally and then discarded, meaning that raising offsets to high values can cause queries to use additional resources.<br /><br />Together, &quot;limit&quot; and &quot;offset&quot; can be used to implement pagination. However, note that if the underlying datasource is modified in between page fetches in ways that affect overall query results, then the different pages will not necessarily align with each other.</td><td>no</td></tr>
+<tr><td>order</td><td>The ordering of returned rows based on timestamp.  &quot;ascending&quot;, &quot;descending&quot;, and &quot;none&quot; (default) are supported.  Currently, &quot;ascending&quot; and &quot;descending&quot; are only supported for queries where the <code>__time</code> column is included in the <code>columns</code> field and the requirements outlined in the <a href="#time-ordering">time ordering</a> section are met.</td><td>none</td></tr>
+<tr><td>legacy</td><td>Return results consistent with the legacy &quot;scan-query&quot; contrib extension. Defaults to the value set by <code>druid.query.scan.legacy</code>, which in turn defaults to false. See <a href="#legacy-mode">Legacy mode</a> for details.</td><td>no</td></tr>
+<tr><td>context</td><td>An additional JSON Object which can be used to specify certain flags (see the <code>query context properties</code> section below).</td><td>no</td></tr>
+</tbody>
+</table>
+<h2><a class="anchor" aria-hidden="true" id="example-results"></a><a href="#example-results" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Example results</h2>
+<p>The format of the result when resultFormat equals <code>list</code>:</p>
+<pre><code class="hljs css language-json"> [{
+    <span class="hljs-attr">"segmentId"</span> : <span class="hljs-string">"wikipedia_editstream_2012-12-29T00:00:00.000Z_2013-01-10T08:00:00.000Z_2013-01-10T08:13:47.830Z_v9"</span>,
+    <span class="hljs-attr">"columns"</span> : [
+      <span class="hljs-string">"timestamp"</span>,
+      <span class="hljs-string">"robot"</span>,
+      <span class="hljs-string">"namespace"</span>,
+      <span class="hljs-string">"anonymous"</span>,
+      <span class="hljs-string">"unpatrolled"</span>,
+      <span class="hljs-string">"page"</span>,
+      <span class="hljs-string">"language"</span>,
+      <span class="hljs-string">"newpage"</span>,
+      <span class="hljs-string">"user"</span>,
+      <span class="hljs-string">"count"</span>,
+      <span class="hljs-string">"added"</span>,
+      <span class="hljs-string">"delta"</span>,
+      <span class="hljs-string">"variation"</span>,
+      <span class="hljs-string">"deleted"</span>
+    ],
+    <span class="hljs-attr">"events"</span> : [ {
+        <span class="hljs-attr">"timestamp"</span> : <span class="hljs-string">"2013-01-01T00:00:00.000Z"</span>,
+        <span class="hljs-attr">"robot"</span> : <span class="hljs-string">"1"</span>,
+        <span class="hljs-attr">"namespace"</span> : <span class="hljs-string">"article"</span>,
+        <span class="hljs-attr">"anonymous"</span> : <span class="hljs-string">"0"</span>,
+        <span class="hljs-attr">"unpatrolled"</span> : <span class="hljs-string">"0"</span>,
+        <span class="hljs-attr">"page"</span> : <span class="hljs-string">"11._korpus_(NOVJ)"</span>,
+        <span class="hljs-attr">"language"</span> : <span class="hljs-string">"sl"</span>,
+        <span class="hljs-attr">"newpage"</span> : <span class="hljs-string">"0"</span>,
+        <span class="hljs-attr">"user"</span> : <span class="hljs-string">"EmausBot"</span>,
+        <span class="hljs-attr">"count"</span> : <span class="hljs-number">1.0</span>,
+        <span class="hljs-attr">"added"</span> : <span class="hljs-number">39.0</span>,
+        <span class="hljs-attr">"delta"</span> : <span class="hljs-number">39.0</span>,
+        <span class="hljs-attr">"variation"</span> : <span class="hljs-number">39.0</span>,
+        <span class="hljs-attr">"deleted"</span> : <span class="hljs-number">0.0</span>
+    }, {
+        <span class="hljs-attr">"timestamp"</span> : <span class="hljs-string">"2013-01-01T00:00:00.000Z"</span>,
+        <span class="hljs-attr">"robot"</span> : <span class="hljs-string">"0"</span>,
+        <span class="hljs-attr">"namespace"</span> : <span class="hljs-string">"article"</span>,
+        <span class="hljs-attr">"anonymous"</span> : <span class="hljs-string">"0"</span>,
+        <span class="hljs-attr">"unpatrolled"</span> : <span class="hljs-string">"0"</span>,
+        <span class="hljs-attr">"page"</span> : <span class="hljs-string">"112_U.S._580"</span>,
+        <span class="hljs-attr">"language"</span> : <span class="hljs-string">"en"</span>,
+        <span class="hljs-attr">"newpage"</span> : <span class="hljs-string">"1"</span>,
+        <span class="hljs-attr">"user"</span> : <span class="hljs-string">"MZMcBride"</span>,
+        <span class="hljs-attr">"count"</span> : <span class="hljs-number">1.0</span>,
+        <span class="hljs-attr">"added"</span> : <span class="hljs-number">70.0</span>,
+        <span class="hljs-attr">"delta"</span> : <span class="hljs-number">70.0</span>,
+        <span class="hljs-attr">"variation"</span> : <span class="hljs-number">70.0</span>,
+        <span class="hljs-attr">"deleted"</span> : <span class="hljs-number">0.0</span>
+    }, {
+        <span class="hljs-attr">"timestamp"</span> : <span class="hljs-string">"2013-01-01T00:00:00.000Z"</span>,
+        <span class="hljs-attr">"robot"</span> : <span class="hljs-string">"0"</span>,
+        <span class="hljs-attr">"namespace"</span> : <span class="hljs-string">"article"</span>,
+        <span class="hljs-attr">"anonymous"</span> : <span class="hljs-string">"0"</span>,
+        <span class="hljs-attr">"unpatrolled"</span> : <span class="hljs-string">"0"</span>,
+        <span class="hljs-attr">"page"</span> : <span class="hljs-string">"113_U.S._243"</span>,
+        <span class="hljs-attr">"language"</span> : <span class="hljs-string">"en"</span>,
+        <span class="hljs-attr">"newpage"</span> : <span class="hljs-string">"1"</span>,
+        <span class="hljs-attr">"user"</span> : <span class="hljs-string">"MZMcBride"</span>,
+        <span class="hljs-attr">"count"</span> : <span class="hljs-number">1.0</span>,
+        <span class="hljs-attr">"added"</span> : <span class="hljs-number">77.0</span>,
+        <span class="hljs-attr">"delta"</span> : <span class="hljs-number">77.0</span>,
+        <span class="hljs-attr">"variation"</span> : <span class="hljs-number">77.0</span>,
+        <span class="hljs-attr">"deleted"</span> : <span class="hljs-number">0.0</span>
+    } ]
+} ]
+</code></pre>
+<p>The format of the result when resultFormat equals <code>compactedList</code>:</p>
+<pre><code class="hljs css language-json"> [{
+    <span class="hljs-attr">"segmentId"</span> : <span class="hljs-string">"wikipedia_editstream_2012-12-29T00:00:00.000Z_2013-01-10T08:00:00.000Z_2013-01-10T08:13:47.830Z_v9"</span>,
+    <span class="hljs-attr">"columns"</span> : [
+      <span class="hljs-string">"timestamp"</span>, <span class="hljs-string">"robot"</span>, <span class="hljs-string">"namespace"</span>, <span class="hljs-string">"anonymous"</span>, <span class="hljs-string">"unpatrolled"</span>, <span class="hljs-string">"page"</span>, <span class="hljs-string">"language"</span>, <span class="hljs-string">"newpage"</span>, <span class="hljs-string">"user"</span>, <span class="hljs-string">"count"</span>, <span class="hljs-string">"added"</span>, <span class="hljs-string">"delta"</span>, <span class="hljs-string">"variation"</span>, <span class="hljs-string">"deleted"</span>
+    ],
+    <span class="hljs-attr">"events"</span> : [
+     [<span class="hljs-string">"2013-01-01T00:00:00.000Z"</span>, <span class="hljs-string">"1"</span>, <span class="hljs-string">"article"</span>, <span class="hljs-string">"0"</span>, <span class="hljs-string">"0"</span>, <span class="hljs-string">"11._korpus_(NOVJ)"</span>, <span class="hljs-string">"sl"</span>, <span class="hljs-string">"0"</span>, <span class="hljs-string">"EmausBot"</span>, <span class="hljs-number">1.0</span>, <span class="hljs-number">39.0</span>, <span class="hljs-number">39.0</span>, <span class="hljs-number">39.0</span>, <span class="hljs-number">0.0</span>],
+     [<span class="hljs-string">"2013-01-01T00:00:00.000Z"</span>, <span class="hljs-string">"0"</span>, <span class="hljs-string">"article"</span>, <span class="hljs-string">"0"</span>, <span class="hljs-string">"0"</span>, <span class="hljs-string">"112_U.S._580"</span>, <span class="hljs-string">"en"</span>, <span class="hljs-string">"1"</span>, <span class="hljs-string">"MZMcBride"</span>, <span class="hljs-number">1.0</span>, <span class="hljs-number">70.0</span>, <span class="hljs-number">70.0</span>, <span class="hljs-number">70.0</span>, <span class="hljs-number">0.0</span>],
+     [<span class="hljs-string">"2013-01-01T00:00:00.000Z"</span>, <span class="hljs-string">"0"</span>, <span class="hljs-string">"article"</span>, <span class="hljs-string">"0"</span>, <span class="hljs-string">"0"</span>, <span class="hljs-string">"113_U.S._243"</span>, <span class="hljs-string">"en"</span>, <span class="hljs-string">"1"</span>, <span class="hljs-string">"MZMcBride"</span>, <span class="hljs-number">1.0</span>, <span class="hljs-number">77.0</span>, <span class="hljs-number">77.0</span>, <span class="hljs-number">77.0</span>, <span class="hljs-number">0.0</span>]
+    ]
+} ]
+</code></pre>
+<h2><a class="anchor" aria-hidden="true" id="time-ordering"></a><a href="#time-ordering" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Time ordering</h2>
+<p>The Scan query currently supports ordering based on timestamp for non-legacy queries.  Note that using time ordering
+will yield results that do not indicate which segment rows are from (<code>segmentId</code> will show up as <code>null</code>).  Furthermore,
+time ordering is only supported where the result set limit is less than <code>druid.query.scan.maxRowsQueuedForOrdering</code>
+rows <strong>or</strong> all segments scanned have fewer than <code>druid.query.scan.maxSegmentPartitionsOrderedInMemory</code> partitions.  Also,
+time ordering is not supported for queries issued directly to historicals unless a list of segments is specified.  The
+reasoning behind these limitations is that the implementation of time ordering uses two strategies that can consume too
+much heap memory if left unbounded.  These strategies (listed below) are chosen on a per-Historical basis depending on
+query result set limit and the number of segments being scanned.</p>
+<ol>
+<li><p>Priority Queue: Each segment on a Historical is opened sequentially.  Every row is added to a bounded priority
+queue which is ordered by timestamp.  For every row above the result set limit, the row with the earliest (if descending)
+or latest (if ascending) timestamp will be dequeued.  After every row has been processed, the sorted contents of the
+priority queue are streamed back to the Broker(s) in batches.  Attempting to load too many rows into memory runs the
+risk of Historical nodes running out of memory.  The <code>druid.query.scan.maxRowsQueuedForOrdering</code> property protects
+from this by limiting the number of rows in the query result set when time ordering is used.</p></li>
+<li><p>N-Way Merge: For each segment, each partition is opened in parallel.  Since each partition's rows are already
+time-ordered, an n-way merge can be performed on the results from each partition.  This approach doesn't persist the entire
+result set in memory (like the Priority Queue) as it streams back batches as they are returned from the merge function.
+However, attempting to query too many partition could also result in high memory usage due to the need to open
+decompression and decoding buffers for each.  The <code>druid.query.scan.maxSegmentPartitionsOrderedInMemory</code> limit protects
+from this by capping the number of partitions opened at any times when time ordering is used.</p></li>
+</ol>
+<p>Both <code>druid.query.scan.maxRowsQueuedForOrdering</code> and <code>druid.query.scan.maxSegmentPartitionsOrderedInMemory</code> are
+configurable and can be tuned based on hardware specs and number of dimensions being queried.  These config properties
+can also be overridden using the <code>maxRowsQueuedForOrdering</code> and <code>maxSegmentPartitionsOrderedInMemory</code> properties in
+the query context (see the Query Context Properties section).</p>
+<h2><a class="anchor" aria-hidden="true" id="legacy-mode"></a><a href="#legacy-mode" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Legacy mode</h2>
+<p>The Scan query supports a legacy mode designed for protocol compatibility with the former scan-query contrib extension.
+In legacy mode you can expect the following behavior changes:</p>
+<ul>
+<li>The <code>__time</code> column is returned as <code>&quot;timestamp&quot;</code> rather than <code>&quot;__time&quot;</code>. This will take precedence over any other column
+you may have that is named <code>&quot;timestamp&quot;</code>.</li>
+<li>The <code>__time</code> column is included in the list of columns even if you do not specifically ask for it.</li>
+<li>Timestamps are returned as ISO8601 time strings rather than integers (milliseconds since 1970-01-01 00:00:00 UTC).</li>
+</ul>
+<p>Legacy mode can be triggered either by passing <code>&quot;legacy&quot; : true</code> in your query JSON, or by setting
+<code>druid.query.scan.legacy = true</code> on your Druid processes. If you were previously using the scan-query contrib extension,
+the best way to migrate is to activate legacy mode during a rolling upgrade, then switch it off after the upgrade
+is complete.</p>
+<h2><a class="anchor" aria-hidden="true" id="configuration-properties"></a><a href="#configuration-properties" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Configuration Properties</h2>
+<p>Configuration properties:</p>
+<table>
+<thead>
+<tr><th>property</th><th>description</th><th>values</th><th>default</th></tr>
+</thead>
+<tbody>
+<tr><td>druid.query.scan.maxRowsQueuedForOrdering</td><td>The maximum number of rows returned when time ordering is used</td><td>An integer in [1, 2147483647]</td><td>100000</td></tr>
+<tr><td>druid.query.scan.maxSegmentPartitionsOrderedInMemory</td><td>The maximum number of segments scanned per historical when time ordering is used</td><td>An integer in [1, 2147483647]</td><td>50</td></tr>
+<tr><td>druid.query.scan.legacy</td><td>Whether legacy mode should be turned on for Scan queries</td><td>true or false</td><td>false</td></tr>
+</tbody>
+</table>
+<h2><a class="anchor" aria-hidden="true" id="query-context-properties"></a><a href="#query-context-properties" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Query context properties</h2>
+<table>
+<thead>
+<tr><th>property</th><th>description</th><th>values</th><th>default</th></tr>
+</thead>
+<tbody>
+<tr><td>maxRowsQueuedForOrdering</td><td>The maximum number of rows returned when time ordering is used.  Overrides the identically named config.</td><td>An integer in [1, 2147483647]</td><td><code>druid.query.scan.maxRowsQueuedForOrdering</code></td></tr>
+<tr><td>maxSegmentPartitionsOrderedInMemory</td><td>The maximum number of segments scanned per historical when time ordering is used.  Overrides the identically named config.</td><td>An integer in [1, 2147483647]</td><td><code>druid.query.scan.maxSegmentPartitionsOrderedInMemory</code></td></tr>
+</tbody>
+</table>
+<p>Sample query context JSON object:</p>
+<pre><code class="hljs css language-json">{
+  <span class="hljs-attr">"maxRowsQueuedForOrdering"</span>: <span class="hljs-number">100001</span>,
+  <span class="hljs-attr">"maxSegmentPartitionsOrderedInMemory"</span>: <span class="hljs-number">100</span>
+}
+</code></pre>
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+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+  -->
+<blockquote>
+<p>Apache Druid supports two query languages: <a href="/docs/0.20.0/querying/sql.html">Druid SQL</a> and <a href="/docs/0.20.0/querying/querying.html">native queries</a>.
+This document describes a query
+type that is only available in the native language.</p>
+</blockquote>
+<p>A search query returns dimension values that match the search specification.</p>
+<pre><code class="hljs css language-json">{
+  <span class="hljs-attr">"queryType"</span>: <span class="hljs-string">"search"</span>,
+  <span class="hljs-attr">"dataSource"</span>: <span class="hljs-string">"sample_datasource"</span>,
+  <span class="hljs-attr">"granularity"</span>: <span class="hljs-string">"day"</span>,
+  <span class="hljs-attr">"searchDimensions"</span>: [
+    <span class="hljs-string">"dim1"</span>,
+    <span class="hljs-string">"dim2"</span>
+  ],
+  <span class="hljs-attr">"query"</span>: {
+    <span class="hljs-attr">"type"</span>: <span class="hljs-string">"insensitive_contains"</span>,
+    <span class="hljs-attr">"value"</span>: <span class="hljs-string">"Ke"</span>
+  },
+  <span class="hljs-attr">"sort"</span> : {
+    <span class="hljs-attr">"type"</span>: <span class="hljs-string">"lexicographic"</span>
+  },
+  <span class="hljs-attr">"intervals"</span>: [
+    <span class="hljs-string">"2013-01-01T00:00:00.000/2013-01-03T00:00:00.000"</span>
+  ]
+}
+</code></pre>
+<p>There are several main parts to a search query:</p>
+<table>
+<thead>
+<tr><th>property</th><th>description</th><th>required?</th></tr>
+</thead>
+<tbody>
+<tr><td>queryType</td><td>This String should always be &quot;search&quot;; this is the first thing Apache Druid looks at to figure out how to interpret the query.</td><td>yes</td></tr>
+<tr><td>dataSource</td><td>A String or Object defining the data source to query, very similar to a table in a relational database. See <a href="/docs/0.20.0/querying/datasource.html">DataSource</a> for more information.</td><td>yes</td></tr>
+<tr><td>granularity</td><td>Defines the granularity of the query. See <a href="/docs/0.20.0/querying/granularities.html">Granularities</a>.</td><td>yes</td></tr>
+<tr><td>filter</td><td>See <a href="/docs/0.20.0/querying/filters.html">Filters</a>.</td><td>no</td></tr>
+<tr><td>limit</td><td>Defines the maximum number per Historical process (parsed as int) of search results to return.</td><td>no (default to 1000)</td></tr>
+<tr><td>intervals</td><td>A JSON Object representing ISO-8601 Intervals. This defines the time ranges to run the query over.</td><td>yes</td></tr>
+<tr><td>searchDimensions</td><td>The dimensions to run the search over. Excluding this means the search is run over all dimensions.</td><td>no</td></tr>
+<tr><td>query</td><td>See <a href="#searchqueryspec">SearchQuerySpec</a>.</td><td>yes</td></tr>
+<tr><td>sort</td><td>An object specifying how the results of the search should be sorted.<br/>Possible types are &quot;lexicographic&quot; (the default sort), &quot;alphanumeric&quot;, &quot;strlen&quot;, and &quot;numeric&quot;.<br/>See <a href="/docs/0.20.0/querying/sorting-orders.html">Sorting Orders</a> for more details.</td><td>no</td></tr>
+<tr><td>context</td><td>See <a href="/docs/0.20.0/querying/query-context.html">Context</a></td><td>no</td></tr>
+</tbody>
+</table>
+<p>The format of the result is:</p>
+<pre><code class="hljs css language-json">[
+  {
+    <span class="hljs-attr">"timestamp"</span>: <span class="hljs-string">"2013-01-01T00:00:00.000Z"</span>,
+    <span class="hljs-attr">"result"</span>: [
+      {
+        <span class="hljs-attr">"dimension"</span>: <span class="hljs-string">"dim1"</span>,
+        <span class="hljs-attr">"value"</span>: <span class="hljs-string">"Ke$ha"</span>,
+        <span class="hljs-attr">"count"</span>: <span class="hljs-number">3</span>
+      },
+      {
+        <span class="hljs-attr">"dimension"</span>: <span class="hljs-string">"dim2"</span>,
+        <span class="hljs-attr">"value"</span>: <span class="hljs-string">"Ke$haForPresident"</span>,
+        <span class="hljs-attr">"count"</span>: <span class="hljs-number">1</span>
+      }
+    ]
+  },
+  {
+    <span class="hljs-attr">"timestamp"</span>: <span class="hljs-string">"2013-01-02T00:00:00.000Z"</span>,
+    <span class="hljs-attr">"result"</span>: [
+      {
+        <span class="hljs-attr">"dimension"</span>: <span class="hljs-string">"dim1"</span>,
+        <span class="hljs-attr">"value"</span>: <span class="hljs-string">"SomethingThatContainsKe"</span>,
+        <span class="hljs-attr">"count"</span>: <span class="hljs-number">1</span>
+      },
+      {
+        <span class="hljs-attr">"dimension"</span>: <span class="hljs-string">"dim2"</span>,
+        <span class="hljs-attr">"value"</span>: <span class="hljs-string">"SomethingElseThatContainsKe"</span>,
+        <span class="hljs-attr">"count"</span>: <span class="hljs-number">2</span>
+      }
+    ]
+  }
+]
+</code></pre>
+<h3><a class="anchor" aria-hidden="true" id="implementation-details"></a><a href="#implementation-details" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Implementation details</h3>
+<h4><a class="anchor" aria-hidden="true" id="strategies"></a><a href="#strategies" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Strategies</h4>
+<p>Search queries can be executed using two different strategies. The default strategy is determined by the
+&quot;druid.query.search.searchStrategy&quot; runtime property on the Broker. This can be overridden using &quot;searchStrategy&quot; in the
+query context. If neither the context field nor the property is set, the &quot;useIndexes&quot; strategy will be used.</p>
+<ul>
+<li><p>&quot;useIndexes&quot; strategy, the default, first categorizes search dimensions into two groups according to their support for
+bitmap indexes. And then, it applies index-only and cursor-based execution plans to the group of dimensions supporting
+bitmaps and others, respectively. The index-only plan uses only indexes for search query processing. For each dimension,
+it reads the bitmap index for each dimension value, evaluates the search predicate, and finally checks the time interval
+and filter predicates. For the cursor-based execution plan, please refer to the &quot;cursorOnly&quot; strategy. The index-only
+plan shows low performance for the search dimensions of large cardinality which means most values of search dimensions
+are unique.</p></li>
+<li><p>&quot;cursorOnly&quot; strategy generates a cursor-based execution plan. This plan creates a cursor which reads a row from a
+queryableIndexSegment, and then evaluates search predicates. If some filters support bitmap indexes, the cursor can read
+only the rows which satisfy those filters, thereby saving I/O cost. However, it might be slow with filters of low selectivity.</p></li>
+<li><p>&quot;auto&quot; strategy uses a cost-based planner for choosing an optimal search strategy. It estimates the cost of index-only
+and cursor-based execution plans, and chooses the optimal one. Currently, it is not enabled by default due to the overhead
+of cost estimation.</p></li>
+</ul>
+<h2><a class="anchor" aria-hidden="true" id="server-configuration"></a><a href="#server-configuration" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Server configuration</h2>
+<p>The following runtime properties apply:</p>
+<table>
+<thead>
+<tr><th>Property</th><th>Description</th><th>Default</th></tr>
+</thead>
+<tbody>
+<tr><td><code>druid.query.search.searchStrategy</code></td><td>Default search query strategy.</td><td>useIndexes</td></tr>
+</tbody>
+</table>
+<h2><a class="anchor" aria-hidden="true" id="query-context"></a><a href="#query-context" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Query context</h2>
+<p>The following query context parameters apply:</p>
+<table>
+<thead>
+<tr><th>Property</th><th>Description</th></tr>
+</thead>
+<tbody>
+<tr><td><code>searchStrategy</code></td><td>Overrides the value of <code>druid.query.search.searchStrategy</code> for this query.</td></tr>
+</tbody>
+</table>
+<h2><a class="anchor" aria-hidden="true" id="searchqueryspec"></a><a href="#searchqueryspec" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>SearchQuerySpec</h2>
+<h3><a class="anchor" aria-hidden="true" id="insensitive_contains"></a><a href="#insensitive_contains" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a><code>insensitive_contains</code></h3>
+<p>If any part of a dimension value contains the value specified in this search query spec, regardless of case, a &quot;match&quot; occurs. The grammar is:</p>
+<pre><code class="hljs css language-json">{
+  <span class="hljs-attr">"type"</span>  : <span class="hljs-string">"insensitive_contains"</span>,
+  <span class="hljs-attr">"value"</span> : <span class="hljs-string">"some_value"</span>
+}
+</code></pre>
+<h3><a class="anchor" aria-hidden="true" id="fragment"></a><a href="#fragment" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a><code>fragment</code></h3>
+<p>If any part of a dimension value contains all of the values specified in this search query spec, regardless of case by default, a &quot;match&quot; occurs. The grammar is:</p>
+<pre><code class="hljs css language-json">{
+  <span class="hljs-attr">"type"</span> : <span class="hljs-string">"fragment"</span>,
+  <span class="hljs-attr">"case_sensitive"</span> : <span class="hljs-literal">false</span>,
+  <span class="hljs-attr">"values"</span> : [<span class="hljs-string">"fragment1"</span>, <span class="hljs-string">"fragment2"</span>]
+}
+</code></pre>
+<h3><a class="anchor" aria-hidden="true" id="contains"></a><a href="#contains" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a><code>contains</code></h3>
+<p>If any part of a dimension value contains the value specified in this search query spec, a &quot;match&quot; occurs. The grammar is:</p>
+<pre><code class="hljs css language-json">{
+  <span class="hljs-attr">"type"</span>  : <span class="hljs-string">"contains"</span>,
+  <span class="hljs-attr">"case_sensitive"</span> : <span class="hljs-literal">true</span>,
+  <span class="hljs-attr">"value"</span> : <span class="hljs-string">"some_value"</span>
+}
+</code></pre>
+<h3><a class="anchor" aria-hidden="true" id="regex"></a><a href="#regex" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a><code>regex</code></h3>
+<p>If any part of a dimension value contains the pattern specified in this search query spec, a &quot;match&quot; occurs. The grammar is:</p>
+<pre><code class="hljs css language-json">{
+  <span class="hljs-attr">"type"</span>  : <span class="hljs-string">"regex"</span>,
+  <span class="hljs-attr">"pattern"</span> : <span class="hljs-string">"some_pattern"</span>
+}
+</code></pre>
+</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/0.20.0/querying/scan-query.html"><span class="arrow-prev">← </span><span>Scan</span></a><a class="docs-next button" href="/docs/0.20.0/querying/timeboundaryquery.html"><span class="function-name-prevnext">TimeBoundary</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#server-configuration">Server configuration</a></li><li><a href="#query-context">Query context</a></li><li><a href="#searchqueryspec">SearchQuerySpec</a><ul class="toc-headings"><li><a href="#insensitive_contains"><code>insensitive_contains</code></a></li><li><a href="#fragment"><code>fragment</code></a></li><li><a href="#contains"><code>contains</code></a></li><li><a href="#regex"><code>regex</code></a></li></ul></li></ul></nav></div><footer class="nav-footer druid-footer" id="footer"><div class="container"><div class="text-center"><p><a href="/technology">Technology</a> · <a href="/use-cases">Use Cases</a> · <a href="/druid-powered">Powered by Druid</a> · <a href="/docs/0.20.0/latest">Docs</a> · <a href="/community/">Community</a> · <a href="/downloads.html">Download</a> · <a href="/faq">FAQ</a></p></div><div class="text-center"><a title="Join the user group" href="https://groups.google.com/forum/#!forum/druid-user" target="_blank"><span class="fa fa-comments"></span></a> · <a title="Follow Druid" href="https://twitter.com/druidio" target="_blank"><span class="fab fa-twitter"></span></a> · <a title="Download via Apache" href="https://www.apache.org/dyn/closer.cgi?path=/incubator/druid/{{ site.druid_versions[0].versions[0].version }}/apache-druid-{{ site.druid_versions[0].versions[0].version }}-bin.tar.gz" target="_blank"><span class="fas fa-feather"></span></a> · <a title="GitHub" href="https://github.com/apache/druid" target="_blank"><span class="fab fa-github"></span></a></div><div class="text-center license">Copyright © 2019 <a href="https://www.apache.org/" target="_blank">Apache Software Foundation</a>.<br/>Except where otherwise noted, licensed under <a rel="license" href="http://creativecommons.org/licenses/by-sa/4.0/">CC BY-SA 4.0</a>.<br/>Apache Druid, Druid, and the Druid logo are either registered trademarks or trademarks of The Apache Software Foundation in the United States and other countries.</div></div></footer></div><script type="text/javascript" src="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.js"></script><script>
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diff --git a/docs/0.20.0/querying/searchqueryspec.html b/docs/0.20.0/querying/searchqueryspec.html
new file mode 100644
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--- /dev/null
+++ b/docs/0.20.0/querying/searchqueryspec.html
@@ -0,0 +1,8 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>Redirecting...</title>
+<link rel="canonical" href="searchquery.html">
+<meta http-equiv="refresh" content="0; url=searchquery.html">
+<h1>Redirecting...</h1>
+<a href="searchquery.html">Click here if you are not redirected.</a>
+<script>location="searchquery.html"</script>
diff --git a/docs/0.20.0/querying/segmentmetadataquery.html b/docs/0.20.0/querying/segmentmetadataquery.html
new file mode 100644
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+++ b/docs/0.20.0/querying/segmentmetadataquery.html
@@ -0,0 +1,239 @@
+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>SegmentMetadata queries · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/0.20.0/querying/segmentmetadataquery.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.20.0" /><meta property="og:title" content="SegmentMetadata queries · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
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+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
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+  ~ regarding copyright ownership.  The ASF licenses this file
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+<blockquote>
+<p>Apache Druid supports two query languages: <a href="/docs/0.20.0/querying/sql.html">Druid SQL</a> and <a href="/docs/0.20.0/querying/querying.html">native queries</a>.
+This document describes a query
+type that is only available in the native language. However, Druid SQL contains similar functionality in
+its <a href="/docs/0.20.0/querying/sql.html#metadata-tables">metadata tables</a>.</p>
+</blockquote>
+<p>Segment metadata queries return per-segment information about:</p>
+<ul>
+<li>Number of rows stored inside the segment</li>
+<li>Interval the segment covers</li>
+<li>Estimated total segment byte size in if it was stored in a 'flat format' (e.g. a csv file)</li>
+<li>Segment id</li>
+<li>Is the segment rolled up</li>
+<li>Detailed per column information such as:
+<ul>
+<li>type</li>
+<li>cardinality</li>
+<li>min/max values</li>
+<li>presence of null values</li>
+<li>estimated 'flat format' byte size</li>
+</ul></li>
+</ul>
+<pre><code class="hljs css language-json">{
+  <span class="hljs-attr">"queryType"</span>:<span class="hljs-string">"segmentMetadata"</span>,
+  <span class="hljs-attr">"dataSource"</span>:<span class="hljs-string">"sample_datasource"</span>,
+  <span class="hljs-attr">"intervals"</span>:[<span class="hljs-string">"2013-01-01/2014-01-01"</span>]
+}
+</code></pre>
+<p>There are several main parts to a segment metadata query:</p>
+<table>
+<thead>
+<tr><th>property</th><th>description</th><th>required?</th></tr>
+</thead>
+<tbody>
+<tr><td>queryType</td><td>This String should always be &quot;segmentMetadata&quot;; this is the first thing Apache Druid looks at to figure out how to interpret the query</td><td>yes</td></tr>
+<tr><td>dataSource</td><td>A String or Object defining the data source to query, very similar to a table in a relational database. See <a href="/docs/0.20.0/querying/datasource.html">DataSource</a> for more information.</td><td>yes</td></tr>
+<tr><td>intervals</td><td>A JSON Object representing ISO-8601 Intervals. This defines the time ranges to run the query over.</td><td>no</td></tr>
+<tr><td>toInclude</td><td>A JSON Object representing what columns should be included in the result. Defaults to &quot;all&quot;.</td><td>no</td></tr>
+<tr><td>merge</td><td>Merge all individual segment metadata results into a single result</td><td>no</td></tr>
+<tr><td>context</td><td>See <a href="/docs/0.20.0/querying/query-context.html">Context</a></td><td>no</td></tr>
+<tr><td>analysisTypes</td><td>A list of Strings specifying what column properties (e.g. cardinality, size) should be calculated and returned in the result. Defaults to [&quot;cardinality&quot;, &quot;interval&quot;, &quot;minmax&quot;], but can be overridden with using the <a href="/docs/0.20.0/configuration/index.html#segmentmetadata-query-config">segment metadata query config</a>. See section <a href="#analysistypes">analysisTypes</a> for more details.</td><td>no</td></tr>
+<tr><td>lenientAggregatorMerge</td><td>If true, and if the &quot;aggregators&quot; analysisType is enabled, aggregators will be merged leniently. See below for details.</td><td>no</td></tr>
+</tbody>
+</table>
+<p>The format of the result is:</p>
+<pre><code class="hljs css language-json">[ {
+  <span class="hljs-attr">"id"</span> : <span class="hljs-string">"some_id"</span>,
+  <span class="hljs-attr">"intervals"</span> : [ <span class="hljs-string">"2013-05-13T00:00:00.000Z/2013-05-14T00:00:00.000Z"</span> ],
+  <span class="hljs-attr">"columns"</span> : {
+    <span class="hljs-attr">"__time"</span> : { <span class="hljs-attr">"type"</span> : <span class="hljs-string">"LONG"</span>, <span class="hljs-attr">"hasMultipleValues"</span> : <span class="hljs-literal">false</span>, <span class="hljs-attr">"hasNulls"</span>: <span class="hljs-literal">false</span>, <span class="hljs-attr">"size"</span> : <span class="hljs-number">407240380</span>, <span class="hljs-attr">"cardinality"</span> : <span class="hljs-literal">null</span>, <span class="hljs-attr">"errorMessage"</span> : <span class="hljs-literal">null</span> },
+    <span class="hljs-attr">"dim1"</span> : { <span class="hljs-attr">"type"</span> : <span class="hljs-string">"STRING"</span>, <span class="hljs-attr">"hasMultipleValues"</span> : <span class="hljs-literal">false</span>, <span class="hljs-attr">"hasNulls"</span>: <span class="hljs-literal">false</span>, <span class="hljs-attr">"size"</span> : <span class="hljs-number">100000</span>, <span class="hljs-attr">"cardinality"</span> : <span class="hljs-number">1944</span>, <span class="hljs-attr">"errorMessage"</span> : <span class="hljs-literal">null</span> },
+    <span class="hljs-attr">"dim2"</span> : { <span class="hljs-attr">"type"</span> : <span class="hljs-string">"STRING"</span>, <span class="hljs-attr">"hasMultipleValues"</span> : <span class="hljs-literal">true</span>, <span class="hljs-attr">"hasNulls"</span>: <span class="hljs-literal">true</span>, <span class="hljs-attr">"size"</span> : <span class="hljs-number">100000</span>, <span class="hljs-attr">"cardinality"</span> : <span class="hljs-number">1504</span>, <span class="hljs-attr">"errorMessage"</span> : <span class="hljs-literal">null</span> },
+    <span class="hljs-attr">"metric1"</span> : { <span class="hljs-attr">"type"</span> : <span class="hljs-string">"FLOAT"</span>, <span class="hljs-attr">"hasMultipleValues"</span> : <span class="hljs-literal">false</span>, <span class="hljs-attr">"hasNulls"</span>: <span class="hljs-literal">false</span>, <span class="hljs-attr">"size"</span> : <span class="hljs-number">100000</span>, <span class="hljs-attr">"cardinality"</span> : <span class="hljs-literal">null</span>, <span class="hljs-attr">"errorMessage"</span> : <span class="hljs-literal">null</span> }
+  },
+  <span class="hljs-attr">"aggregators"</span> : {
+    <span class="hljs-attr">"metric1"</span> : { <span class="hljs-attr">"type"</span> : <span class="hljs-string">"longSum"</span>, <span class="hljs-attr">"name"</span> : <span class="hljs-string">"metric1"</span>, <span class="hljs-attr">"fieldName"</span> : <span class="hljs-string">"metric1"</span> }
+  },
+  <span class="hljs-attr">"queryGranularity"</span> : {
+    <span class="hljs-attr">"type"</span>: <span class="hljs-string">"none"</span>
+  },
+  <span class="hljs-attr">"size"</span> : <span class="hljs-number">300000</span>,
+  <span class="hljs-attr">"numRows"</span> : <span class="hljs-number">5000000</span>
+} ]
+</code></pre>
+<p>Dimension columns will have type <code>STRING</code>, <code>FLOAT</code>, <code>DOUBLE</code>, or <code>LONG</code>.
+Metric columns will have type <code>FLOAT</code>, <code>DOUBLE</code>, or <code>LONG</code>, or the name of the underlying complex type such as <code>hyperUnique</code> in case of COMPLEX metric.
+Timestamp column will have type <code>LONG</code>.</p>
+<p>If the <code>errorMessage</code> field is non-null, you should not trust the other fields in the response. Their contents are
+undefined.</p>
+<p>Only columns which are dictionary encoded (i.e., have type <code>STRING</code>) will have any cardinality. Rest of the columns (timestamp and metric columns) will show cardinality as <code>null</code>.</p>
+<h2><a class="anchor" aria-hidden="true" id="intervals"></a><a href="#intervals" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>intervals</h2>
+<p>If an interval is not specified, the query will use a default interval that spans a configurable period before the end time of the most recent segment.</p>
+<p>The length of this default time period is set in the Broker configuration via:
+druid.query.segmentMetadata.defaultHistory</p>
+<h2><a class="anchor" aria-hidden="true" id="toinclude"></a><a href="#toinclude" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>toInclude</h2>
+<p>There are 3 types of toInclude objects.</p>
+<h3><a class="anchor" aria-hidden="true" id="all"></a><a href="#all" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>All</h3>
+<p>The grammar is as follows:</p>
+<pre><code class="hljs css language-json">"toInclude": { "type": "all"}
+</code></pre>
+<h3><a class="anchor" aria-hidden="true" id="none"></a><a href="#none" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>None</h3>
+<p>The grammar is as follows:</p>
+<pre><code class="hljs css language-json">"toInclude": { "type": "none"}
+</code></pre>
+<h3><a class="anchor" aria-hidden="true" id="list"></a><a href="#list" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>List</h3>
+<p>The grammar is as follows:</p>
+<pre><code class="hljs css language-json">"toInclude": { "type": "list", "columns": [&lt;string list of column names&gt;]}
+</code></pre>
+<h2><a class="anchor" aria-hidden="true" id="analysistypes"></a><a href="#analysistypes" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>analysisTypes</h2>
+<p>This is a list of properties that determines the amount of information returned about the columns, i.e. analyses to be performed on the columns.</p>
+<p>By default, the &quot;cardinality&quot;, &quot;interval&quot;, and &quot;minmax&quot; types will be used. If a property is not needed, omitting it from this list will result in a more efficient query.</p>
+<p>The default analysis types can be set in the Broker configuration via:
+<code>druid.query.segmentMetadata.defaultAnalysisTypes</code></p>
+<p>Types of column analyses are described below:</p>
+<h3><a class="anchor" aria-hidden="true" id="cardinality"></a><a href="#cardinality" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>cardinality</h3>
+<ul>
+<li><code>cardinality</code> in the result will return the estimated floor of cardinality for each column. Only relevant for
+dimension columns.</li>
+</ul>
+<h3><a class="anchor" aria-hidden="true" id="minmax"></a><a href="#minmax" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>minmax</h3>
+<ul>
+<li>Estimated min/max values for each column. Only relevant for dimension columns.</li>
+</ul>
+<h3><a class="anchor" aria-hidden="true" id="size"></a><a href="#size" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>size</h3>
+<ul>
+<li><code>size</code> in the result will contain the estimated total segment byte size as if the data were stored in text format</li>
+</ul>
+<h3><a class="anchor" aria-hidden="true" id="interval"></a><a href="#interval" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>interval</h3>
+<ul>
+<li><code>intervals</code> in the result will contain the list of intervals associated with the queried segments.</li>
+</ul>
+<h3><a class="anchor" aria-hidden="true" id="timestampspec"></a><a href="#timestampspec" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>timestampSpec</h3>
+<ul>
+<li><code>timestampSpec</code> in the result will contain timestampSpec of data stored in segments. this can be null if timestampSpec of segments was unknown or unmergeable (if merging is enabled).</li>
+</ul>
+<h3><a class="anchor" aria-hidden="true" id="querygranularity"></a><a href="#querygranularity" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>queryGranularity</h3>
+<ul>
+<li><code>queryGranularity</code> in the result will contain query granularity of data stored in segments. this can be null if query granularity of segments was unknown or unmergeable (if merging is enabled).</li>
+</ul>
+<h3><a class="anchor" aria-hidden="true" id="aggregators"></a><a href="#aggregators" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>aggregators</h3>
+<ul>
+<li><p><code>aggregators</code> in the result will contain the list of aggregators usable for querying metric columns. This may be
+null if the aggregators are unknown or unmergeable (if merging is enabled).</p></li>
+<li><p>Merging can be strict or lenient. See <em>lenientAggregatorMerge</em> below for details.</p></li>
+<li><p>The form of the result is a map of column name to aggregator.</p></li>
+</ul>
+<h3><a class="anchor" aria-hidden="true" id="rollup"></a><a href="#rollup" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>rollup</h3>
+<ul>
+<li><code>rollup</code> in the result is true/false/null.</li>
+<li>When merging is enabled, if some are rollup, others are not, result is null.</li>
+</ul>
+<h2><a class="anchor" aria-hidden="true" id="lenientaggregatormerge"></a><a href="#lenientaggregatormerge" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>lenientAggregatorMerge</h2>
+<p>Conflicts between aggregator metadata across segments can occur if some segments have unknown aggregators, or if
+two segments use incompatible aggregators for the same column (e.g. longSum changed to doubleSum).</p>
+<p>Aggregators can be merged strictly (the default) or leniently. With strict merging, if there are any segments
+with unknown aggregators, or any conflicts of any kind, the merged aggregators list will be <code>null</code>. With lenient
+merging, segments with unknown aggregators will be ignored, and conflicts between aggregators will only null out
+the aggregator for that particular column.</p>
+<p>In particular, with lenient merging, it is possible for an individual column's aggregator to be <code>null</code>. This will not
+occur with strict merging.</p>
+</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/0.20.0/querying/timeboundaryquery.html"><span class="arrow-prev">← </span><span class="function-name-prevnext">TimeBoundary</span></a><a class="docs-next button" href="/docs/0.20.0/querying/datasourcemetadataquery.html"><span class="function-name-prevnext">DatasourceMetadata</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#intervals">intervals</a></li><li><a href="#toinclude">toInclude</a><ul class="toc-headings"><li><a href="#all">All</a></li><li><a href="#none">None</a></li><li><a href="#list">List</a></li></ul></li><li><a href="#analysistypes">analysisTypes</a><ul class="toc-headings"><li><a href="#cardinality">cardinality</a></li><li><a href="#minmax">minmax</a></li><li><a href="#size">size</a></li><li><a href="#interval">interval</a></li><li><a href="#timestampspec">timestampSpec</a></li><li><a href="#querygranularity">queryGranularity</a></li><li><a href="#aggregators">aggregators</a></li><li><a href="#rollup">rollup</a></li></ul></li><li><a href="#lenientaggregatormerge">lenientAggregatorMerge</a></li></ul></nav></div><footer class="nav-footer druid-footer" id="footer"><div class="container"><div class="text-center"><p><a href="/technology">Technology</a> · <a href="/use-cases">Use Cases</a> · <a href="/druid-powered">Powered by Druid</a> · <a href="/docs/0.20.0/latest">Docs</a> · <a href="/community/">Community</a> · <a href="/downloads.html">Download</a> · <a href="/faq">FAQ</a></p></div><div class="text-center"><a title="Join the user group" href="https://groups.google.com/forum/#!forum/druid-user" target="_blank"><span class="fa fa-comments"></span></a> · <a title="Follow Druid" href="https://twitter.com/druidio" target="_blank"><span class="fab fa-twitter"></span></a> · <a title="Download via Apache" href="https://www.apache.org/dyn/closer.cgi?path=/incubator/druid/{{ site.druid_versions[0].versions[0].version }}/apache-druid-{{ site.druid_versions[0].versions[0].version }}-bin.tar.gz" target="_blank"><span class="fas fa-feather"></span></a> · <a title="GitHub" href="https://github.com/apache/druid" target="_blank"><span class="fab fa-github"></span></a></div><div class="text-center license">Copyright © 2019 <a href="https://www.apache.org/" target="_blank">Apache Software Foundation</a>.<br/>Except where otherwise noted, licensed under <a rel="license" href="http://creativecommons.org/licenses/by-sa/4.0/">CC BY-SA 4.0</a>.<br/>Apache Druid, Druid, and the Druid logo are either registered trademarks or trademarks of The Apache Software Foundation in the United States and other countries.</div></div></footer></div><script type="text/javascript" src="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.js"></script><script>
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+<p>Older versions of Apache Druid included a Select query type. Since Druid 0.17.0, it has been removed and replaced by the <a href="/docs/0.20.0/querying/scan-query.html">Scan query</a>, which offers improved memory usage and performance. This solves issues that users had with Select queries causing Druid to run out of memory or slow down.</p>
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+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>String comparators · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/0.20.0/querying/sorting-orders.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.20.0" /><meta property="og:title" content="String comparators · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
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class="icon-toc"></i></div></div><div class="navGroups"><div class="navGroup"><h3 class="navGroupCategoryTitle collapsible">Getting started<span class="arrow"><svg width="24" height="24" viewBox="0 0 24 24"><path fill="#565656" d="M7.41 15.41L12 10.83l4.59 4.58L18 14l-6-6-6 6z"></path><path d="M0 0h24v24H0z" fill="none"></path></svg></span></h3><ul class="hide"><li class="navListItem"><a class="navItem" href="/docs/0.20.0/design/index.html">Introduction to Apache Druid</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/tutorials/index.html">Quickstart</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/tutorials/docker.html">Docker</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/operations/single-server.html">Single server deployment</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/tutorials/cluster.html">Clustered deployment</a></li></ul></div><div class="navGroup"><h3 class="navGroupCategoryTitle 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+                  return;
+                }
+
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+                  event.preventDefault();
+
+                  target.classList.toggle(className);
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+              }
+            });
+        </script></nav></div><div class="container mainContainer docsContainer"><div class="wrapper"><div class="post"><header class="postHeader"><a class="edit-page-link button" href="https://github.com/apache/druid/edit/master/docs/querying/sorting-orders.md" target="_blank" rel="noreferrer noopener">Edit</a><h1 id="__docusaurus" class="postHeaderTitle">String comparators</h1></header><article><div><span><!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
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+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+  -->
+<blockquote>
+<p>Apache Druid supports two query languages: <a href="/docs/0.20.0/querying/sql.html">Druid SQL</a> and <a href="/docs/0.20.0/querying/querying.html">native queries</a>.
+This document describes the native
+language. For information about functions available in SQL, refer to the
+<a href="/docs/0.20.0/querying/sql.html#scalar-functions">SQL documentation</a>.</p>
+</blockquote>
+<p>These sorting orders are used by the <a href="/docs/0.20.0/querying/topnmetricspec.html">TopNMetricSpec</a>, <a href="/docs/0.20.0/querying/searchquery.html">SearchQuery</a>, GroupByQuery's <a href="/docs/0.20.0/querying/limitspec.html">LimitSpec</a>, and <a href="./filters.html#bound-filter">BoundFilter</a>.</p>
+<h2><a class="anchor" aria-hidden="true" id="lexicographic"></a><a href="#lexicographic" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Lexicographic</h2>
+<p>Sorts values by converting Strings to their UTF-8 byte array representations and comparing lexicographically, byte-by-byte.</p>
+<h2><a class="anchor" aria-hidden="true" id="alphanumeric"></a><a href="#alphanumeric" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Alphanumeric</h2>
+<p>Suitable for strings with both numeric and non-numeric content, e.g.: &quot;file12 sorts after file2&quot;</p>
+<p>See <a href="https://github.com/amjjd/java-alphanum">https://github.com/amjjd/java-alphanum</a> for more details on how this ordering sorts values.</p>
+<p>This ordering is not suitable for numbers with decimal points or negative numbers.</p>
+<ul>
+<li>For example, &quot;1.3&quot; precedes &quot;1.15&quot; in this ordering because &quot;15&quot; has more significant digits than &quot;3&quot;.</li>
+<li>Negative numbers are sorted after positive numbers (because numeric characters precede the &quot;-&quot; in the negative numbers).</li>
+</ul>
+<h2><a class="anchor" aria-hidden="true" id="numeric"></a><a href="#numeric" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Numeric</h2>
+<p>Sorts values as numbers, supports integers and floating point values. Negative values are supported.</p>
+<p>This sorting order will try to parse all string values as numbers. Unparseable values are treated as nulls, and nulls precede numbers.</p>
+<p>When comparing two unparseable values (e.g., &quot;hello&quot; and &quot;world&quot;), this ordering will sort by comparing the unparsed strings lexicographically.</p>
+<h2><a class="anchor" aria-hidden="true" id="strlen"></a><a href="#strlen" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Strlen</h2>
+<p>Sorts values by the their string lengths. When there is a tie, this comparator falls back to using the String compareTo method.</p>
+<h2><a class="anchor" aria-hidden="true" id="version"></a><a href="#version" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Version</h2>
+<p>Sorts values as versions, e.g.: &quot;10.0 sorts after 9.0&quot;, &quot;1.0.0-SNAPSHOT sorts after 1.0.0&quot;.</p>
+<p>See <a href="https://maven.apache.org/ref/3.6.0/maven-artifact/apidocs/org/apache/maven/artifact/versioning/ComparableVersion.html">https://maven.apache.org/ref/3.6.0/maven-artifact/apidocs/org/apache/maven/artifact/versioning/ComparableVersion.html</a> for more details on how this ordering sorts values.</p>
+</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/0.20.0/querying/topnmetricspec.html"><span class="arrow-prev">← </span><span class="function-name-prevnext">Sorting (topN)</span></a><a class="docs-next button" href="/docs/0.20.0/querying/virtual-columns.html"><span>Virtual columns</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#lexicographic">Lexicographic</a></li><li><a href="#alphanumeric">Alphanumeric</a></li><li><a href="#numeric">Numeric</a></li><li><a href="#strlen">Strlen</a></li><li><a href="#version">Version</a></li></ul></nav></div><footer class="nav-footer druid-footer" id="footer"><div class="container"><div class="text-center"><p><a href="/technology">Technology</a> · <a href="/use-cases">Use Cases</a> · <a href="/druid-powered">Powered by Druid</a> · <a href="/docs/0.20.0/latest">Docs</a> · <a href="/community/">Community</a> · <a href="/downloads.html">Download</a> · <a href="/faq">FAQ</a></p></div><div class="text-center"><a title="Join the user group" href="https://groups.google.com/forum/#!forum/druid-user" target="_blank"><span class="fa fa-comments"></span></a> · <a title="Follow Druid" href="https://twitter.com/druidio" target="_blank"><span class="fab fa-twitter"></span></a> · <a title="Download via Apache" href="https://www.apache.org/dyn/closer.cgi?path=/incubator/druid/{{ site.druid_versions[0].versions[0].version }}/apache-druid-{{ site.druid_versions[0].versions[0].version }}-bin.tar.gz" target="_blank"><span class="fas fa-feather"></span></a> · <a title="GitHub" href="https://github.com/apache/druid" target="_blank"><span class="fab fa-github"></span></a></div><div class="text-center license">Copyright © 2019 <a href="https://www.apache.org/" target="_blank">Apache Software Foundation</a>.<br/>Except where otherwise noted, licensed under <a rel="license" href="http://creativecommons.org/licenses/by-sa/4.0/">CC BY-SA 4.0</a>.<br/>Apache Druid, Druid, and the Druid logo are either registered trademarks or trademarks of The Apache Software Foundation in the United States and other countries.</div></div></footer></div><script type="text/javascript" src="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.js"></script><script>
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+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>SQL · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/0.20.0/querying/sql.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.20.0" /><meta property="og:title" content="SQL · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
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+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
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+<!--
+  The format of the tables that describe the functions and operators
+  should not be changed without updating the script create-sql-function-doc
+  in web-console/script/create-sql-function-doc, because the script detects
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+<blockquote>
+<p>Apache Druid supports two query languages: Druid SQL and <a href="/docs/0.20.0/querying/querying.html">native queries</a>.
+This document describes the SQL language.</p>
+</blockquote>
+<p>Druid SQL is a built-in SQL layer and an alternative to Druid's native JSON-based query language, and is powered by a
+parser and planner based on <a href="https://calcite.apache.org/">Apache Calcite</a>. Druid SQL translates SQL into native Druid
+queries on the query Broker (the first process you query), which are then passed down to data processes as native Druid
+queries. Other than the (slight) overhead of <a href="#query-translation">translating</a> SQL on the Broker, there isn't an
+additional performance penalty versus native queries.</p>
+<h2><a class="anchor" aria-hidden="true" id="query-syntax"></a><a href="#query-syntax" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Query syntax</h2>
+<p>Druid SQL supports SELECT queries with the following structure:</p>
+<pre><code class="hljs">[ <span class="hljs-keyword">EXPLAIN</span> PLAN <span class="hljs-keyword">FOR</span> ]
+[ <span class="hljs-keyword">WITH</span> tableName [ ( column1, column2, ... ) ] <span class="hljs-keyword">AS</span> ( <span class="hljs-keyword">query</span> ) ]
+<span class="hljs-keyword">SELECT</span> [ <span class="hljs-keyword">ALL</span> | <span class="hljs-keyword">DISTINCT</span> ] { * | exprs }
+<span class="hljs-keyword">FROM</span> { &lt;<span class="hljs-keyword">table</span>&gt; | (&lt;subquery&gt;) | &lt;o1&gt; [ <span class="hljs-keyword">INNER</span> | <span class="hljs-keyword">LEFT</span> ] <span class="hljs-keyword">JOIN</span> &lt;o2&gt; <span class="hljs-keyword">ON</span> condition }
+[ <span class="hljs-keyword">WHERE</span> expr ]
+[ <span class="hljs-keyword">GROUP</span> <span class="hljs-keyword">BY</span> [ exprs | <span class="hljs-keyword">GROUPING</span> <span class="hljs-keyword">SETS</span> ( (exprs), ... ) | <span class="hljs-keyword">ROLLUP</span> (exprs) | <span class="hljs-keyword">CUBE</span> (exprs) ] ]
+[ <span class="hljs-keyword">HAVING</span> expr ]
+[ <span class="hljs-keyword">ORDER</span> <span class="hljs-keyword">BY</span> expr [ <span class="hljs-keyword">ASC</span> | <span class="hljs-keyword">DESC</span> ], expr [ <span class="hljs-keyword">ASC</span> | <span class="hljs-keyword">DESC</span> ], ... ]
+[ <span class="hljs-keyword">LIMIT</span> <span class="hljs-keyword">limit</span> ]
+[ <span class="hljs-keyword">OFFSET</span> <span class="hljs-keyword">offset</span> ]
+[ <span class="hljs-keyword">UNION</span> <span class="hljs-keyword">ALL</span> &lt;another <span class="hljs-keyword">query</span>&gt; ]
+</code></pre>
+<h3><a class="anchor" aria-hidden="true" id="from"></a><a href="#from" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>FROM</h3>
+<p>The FROM clause can refer to any of the following:</p>
+<ul>
+<li><a href="datasource.html#table">Table datasources</a> from the <code>druid</code> schema. This is the default schema, so Druid table
+datasources can be referenced as either <code>druid.dataSourceName</code> or simply <code>dataSourceName</code>.</li>
+<li><a href="datasource.html#lookup">Lookups</a> from the <code>lookup</code> schema, for example <code>lookup.countries</code>. Note that lookups can
+also be queried using the <a href="#string-functions"><code>LOOKUP</code> function</a>.</li>
+<li><a href="datasource.html#query">Subqueries</a>.</li>
+<li><a href="datasource.html#join">Joins</a> between anything in this list, except between native datasources (table, lookup,
+query) and system tables. The join condition must be an equality between expressions from the left- and right-hand side
+of the join.</li>
+<li><a href="#metadata-tables">Metadata tables</a> from the <code>INFORMATION_SCHEMA</code> or <code>sys</code> schemas. Unlike the other options for the
+FROM clause, metadata tables are not considered datasources. They exist only in the SQL layer.</li>
+</ul>
+<p>For more information about table, lookup, query, and join datasources, refer to the <a href="datasource.html">Datasources</a>
+documentation.</p>
+<h3><a class="anchor" aria-hidden="true" id="where"></a><a href="#where" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>WHERE</h3>
+<p>The WHERE clause refers to columns in the FROM table, and will be translated to <a href="filters.html">native filters</a>. The
+WHERE clause can also reference a subquery, like <code>WHERE col1 IN (SELECT foo FROM ...)</code>. Queries like this are executed
+as a join on the subquery, described below in the <a href="#subqueries">Query translation</a> section.</p>
+<h3><a class="anchor" aria-hidden="true" id="group-by"></a><a href="#group-by" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>GROUP BY</h3>
+<p>The GROUP BY clause refers to columns in the FROM table. Using GROUP BY, DISTINCT, or any aggregation functions will
+trigger an aggregation query using one of Druid's <a href="#query-types">three native aggregation query types</a>. GROUP BY
+can refer to an expression or a select clause ordinal position (like <code>GROUP BY 2</code> to group by the second selected
+column).</p>
+<p>The GROUP BY clause can also refer to multiple grouping sets in three ways. The most flexible is GROUP BY GROUPING SETS,
+for example <code>GROUP BY GROUPING SETS ( (country, city), () )</code>. This example is equivalent to a <code>GROUP BY country, city</code>
+followed by <code>GROUP BY ()</code> (a grand total). With GROUPING SETS, the underlying data is only scanned one time, leading to
+better efficiency. Second, GROUP BY ROLLUP computes a grouping set for each level of the grouping expressions. For
+example <code>GROUP BY ROLLUP (country, city)</code> is equivalent to <code>GROUP BY GROUPING SETS ( (country, city), (country), () )</code>
+and will produce grouped rows for each country / city pair, along with subtotals for each country, along with a grand
+total. Finally, GROUP BY CUBE computes a grouping set for each combination of grouping expressions. For example,
+<code>GROUP BY CUBE (country, city)</code> is equivalent to <code>GROUP BY GROUPING SETS ( (country, city), (country), (city), () )</code>.
+Grouping columns that do not apply to a particular row will contain <code>NULL</code>. For example, when computing
+<code>GROUP BY GROUPING SETS ( (country, city), () )</code>, the grand total row corresponding to <code>()</code> will have <code>NULL</code> for the
+&quot;country&quot; and &quot;city&quot; columns.</p>
+<p>When using GROUP BY GROUPING SETS, GROUP BY ROLLUP, or GROUP BY CUBE, be aware that results may not be generated in the
+order that you specify your grouping sets in the query. If you need results to be generated in a particular order, use
+the ORDER BY clause.</p>
+<h3><a class="anchor" aria-hidden="true" id="having"></a><a href="#having" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>HAVING</h3>
+<p>The HAVING clause refers to columns that are present after execution of GROUP BY. It can be used to filter on either
+grouping expressions or aggregated values. It can only be used together with GROUP BY.</p>
+<h3><a class="anchor" aria-hidden="true" id="order-by"></a><a href="#order-by" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>ORDER BY</h3>
+<p>The ORDER BY clause refers to columns that are present after execution of GROUP BY. It can be used to order the results
+based on either grouping expressions or aggregated values. ORDER BY can refer to an expression or a select clause
+ordinal position (like <code>ORDER BY 2</code> to order by the second selected column). For non-aggregation queries, ORDER BY
+can only order by the <code>__time</code> column. For aggregation queries, ORDER BY can order by any column.</p>
+<h3><a class="anchor" aria-hidden="true" id="limit"></a><a href="#limit" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>LIMIT</h3>
+<p>The LIMIT clause limits the number of rows returned. In some situations Druid will push down this limit to data servers,
+which boosts performance. Limits are always pushed down for queries that run with the native Scan or TopN query types.
+With the native GroupBy query type, it is pushed down when ordering on a column that you are grouping by. If you notice
+that adding a limit doesn't change performance very much, then it's possible that Druid wasn't able to push down the
+limit for your query.</p>
+<h3><a class="anchor" aria-hidden="true" id="offset"></a><a href="#offset" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>OFFSET</h3>
+<p>The OFFSET clause skips a certain number of rows when returning results.</p>
+<p>If both LIMIT and OFFSET are provided, then OFFSET will be applied first, followed by LIMIT. For example, using
+LIMIT 100 OFFSET 10 will return 100 rows, starting from row number 10.</p>
+<p>Together, LIMIT and OFFSET can be used to implement pagination. However, note that if the underlying datasource is
+modified between page fetches, then the different pages will not necessarily align with each other.</p>
+<p>There are two important factors that can affect the performance of queries that use OFFSET:</p>
+<ul>
+<li>Skipped rows still need to be generated internally and then discarded, meaning that raising offsets to high values
+can cause queries to use additional resources.</li>
+<li>OFFSET is only supported by the Scan and GroupBy <a href="#query-types">native query types</a>. Therefore, a query with OFFSET
+will use one of those two types, even if it might otherwise have run as a Timeseries or TopN. Switching query engines
+in this way can affect performance.</li>
+</ul>
+<h3><a class="anchor" aria-hidden="true" id="union-all"></a><a href="#union-all" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>UNION ALL</h3>
+<p>The &quot;UNION ALL&quot; operator fuses multiple queries together. Druid SQL supports the UNION ALL operator in two situations:
+top-level and table-level. Queries that use UNION ALL in any other way will not be able to execute.</p>
+<h4><a class="anchor" aria-hidden="true" id="top-level"></a><a href="#top-level" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Top-level</h4>
+<p>UNION ALL can be used at the very top outer layer of a SQL query (not in a subquery, and not in the FROM clause). In
+this case, the underlying queries will be run separately, back to back, and their results will all be returned in
+one result set.</p>
+<p>For example:</p>
+<pre><code class="hljs"><span class="hljs-keyword">SELECT</span> COUNT<span class="hljs-comment">(*) FROM tbl WHERE my_column = 'value1'
+UNION ALL
+SELECT COUNT(*)</span> <span class="hljs-keyword">FROM</span> tbl <span class="hljs-keyword">WHERE</span> my_column = <span class="hljs-string">'value2'</span>
+</code></pre>
+<p>When UNION ALL occurs at the top level of a query like this, the results from the unioned queries are concatenated
+together and appear one after the other.</p>
+<h4><a class="anchor" aria-hidden="true" id="table-level"></a><a href="#table-level" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Table-level</h4>
+<p>UNION ALL can be used to query multiple tables at the same time. In this case, it must appear in the FROM clause,
+and the subqueries that are inputs to the UNION ALL operator must be simple table SELECTs (no expressions, column
+aliasing, etc). The query will run natively using a <a href="/docs/0.20.0/querying/datasource.html#union">union datasource</a>.</p>
+<p>The same columns must be selected from each table in the same order, and those columns must either have the same types,
+or types that can be implicitly cast to each other (such as different numeric types). For this reason, it is generally
+more robust to write your queries to select specific columns. If you use <code>SELECT *</code>, you will need to modify your
+queries if a new column is added to one of the tables but not to the others.</p>
+<p>For example:</p>
+<pre><code class="hljs">SELECT col1, COUNT(*)
+<span class="hljs-keyword">FROM</span> (
+  SELECT col1, col2, col3 <span class="hljs-keyword">FROM</span> tbl1
+  UNION ALL
+  SELECT col1, col2, col3 <span class="hljs-keyword">FROM</span> tbl2
+)<span class="hljs-built_in">
+GROUP </span>BY col1
+</code></pre>
+<p>When UNION ALL occurs at the table level, the rows from the unioned tables are not guaranteed to be processed in
+any particular order. They may be processed in an interleaved fashion. If you need a particular result ordering,
+use <a href="#order-by">ORDER BY</a>.</p>
+<h3><a class="anchor" aria-hidden="true" id="explain-plan"></a><a href="#explain-plan" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>EXPLAIN PLAN</h3>
+<p>Add &quot;EXPLAIN PLAN FOR&quot; to the beginning of any query to get information about how it will be translated. In this case,
+the query will not actually be executed. Refer to the <a href="#query-translation">Query translation</a> documentation for help
+interpreting EXPLAIN PLAN output.</p>
+<h3><a class="anchor" aria-hidden="true" id="identifiers-and-literals"></a><a href="#identifiers-and-literals" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Identifiers and literals</h3>
+<p>Identifiers like datasource and column names can optionally be quoted using double quotes. To escape a double quote
+inside an identifier, use another double quote, like <code>&quot;My &quot;&quot;very own&quot;&quot; identifier&quot;</code>. All identifiers are case-sensitive
+and no implicit case conversions are performed.</p>
+<p>Literal strings should be quoted with single quotes, like <code>'foo'</code>. Literal strings with Unicode escapes can be written
+like <code>U&amp;'fo\00F6'</code>, where character codes in hex are prefixed by a backslash. Literal numbers can be written in forms
+like <code>100</code> (denoting an integer), <code>100.0</code> (denoting a floating point value), or <code>1.0e5</code> (scientific notation). Literal
+timestamps can be written like <code>TIMESTAMP '2000-01-01 00:00:00'</code>. Literal intervals, used for time arithmetic, can be
+written like <code>INTERVAL '1' HOUR</code>, <code>INTERVAL '1 02:03' DAY TO MINUTE</code>, <code>INTERVAL '1-2' YEAR TO MONTH</code>, and so on.</p>
+<h3><a class="anchor" aria-hidden="true" id="dynamic-parameters"></a><a href="#dynamic-parameters" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Dynamic parameters</h3>
+<p>Druid SQL supports dynamic parameters using question mark (<code>?</code>) syntax, where parameters are bound to <code>?</code> placeholders
+at execution time. To use dynamic parameters, replace any literal in the query with a <code>?</code> character and provide a
+corresponding parameter value when you execute the query. Parameters are bound to the placeholders in the order in
+which they are passed. Parameters are supported in both the <a href="#http-post">HTTP POST</a> and <a href="#jdbc">JDBC</a> APIs.</p>
+<h2><a class="anchor" aria-hidden="true" id="data-types"></a><a href="#data-types" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Data types</h2>
+<h3><a class="anchor" aria-hidden="true" id="standard-types"></a><a href="#standard-types" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Standard types</h3>
+<p>Druid natively supports five basic column types: &quot;long&quot; (64 bit signed int), &quot;float&quot; (32 bit float), &quot;double&quot; (64 bit
+float) &quot;string&quot; (UTF-8 encoded strings and string arrays), and &quot;complex&quot; (catch-all for more exotic data types like
+hyperUnique and approxHistogram columns).</p>
+<p>Timestamps (including the <code>__time</code> column) are treated by Druid as longs, with the value being the number of
+milliseconds since 1970-01-01 00:00:00 UTC, not counting leap seconds. Therefore, timestamps in Druid do not carry any
+timezone information, but only carry information about the exact moment in time they represent. See the
+<a href="#time-functions">Time functions</a> section for more information about timestamp handling.</p>
+<p>The following table describes how Druid maps SQL types onto native types at query runtime. Casts between two SQL types
+that have the same Druid runtime type will have no effect, other than exceptions noted in the table. Casts between two
+SQL types that have different Druid runtime types will generate a runtime cast in Druid. If a value cannot be properly
+cast to another value, as in <code>CAST('foo' AS BIGINT)</code>, the runtime will substitute a default value. NULL values cast
+to non-nullable types will also be substituted with a default value (for example, nulls cast to numbers will be
+converted to zeroes).</p>
+<table>
+<thead>
+<tr><th>SQL type</th><th>Druid runtime type</th><th>Default value</th><th>Notes</th></tr>
+</thead>
+<tbody>
+<tr><td>CHAR</td><td>STRING</td><td><code>''</code></td><td></td></tr>
+<tr><td>VARCHAR</td><td>STRING</td><td><code>''</code></td><td>Druid STRING columns are reported as VARCHAR. Can include <a href="#multi-value-strings">multi-value strings</a> as well.</td></tr>
+<tr><td>DECIMAL</td><td>DOUBLE</td><td><code>0.0</code></td><td>DECIMAL uses floating point, not fixed point math</td></tr>
+<tr><td>FLOAT</td><td>FLOAT</td><td><code>0.0</code></td><td>Druid FLOAT columns are reported as FLOAT</td></tr>
+<tr><td>REAL</td><td>DOUBLE</td><td><code>0.0</code></td><td></td></tr>
+<tr><td>DOUBLE</td><td>DOUBLE</td><td><code>0.0</code></td><td>Druid DOUBLE columns are reported as DOUBLE</td></tr>
+<tr><td>BOOLEAN</td><td>LONG</td><td><code>false</code></td><td></td></tr>
+<tr><td>TINYINT</td><td>LONG</td><td><code>0</code></td><td></td></tr>
+<tr><td>SMALLINT</td><td>LONG</td><td><code>0</code></td><td></td></tr>
+<tr><td>INTEGER</td><td>LONG</td><td><code>0</code></td><td></td></tr>
+<tr><td>BIGINT</td><td>LONG</td><td><code>0</code></td><td>Druid LONG columns (except <code>__time</code>) are reported as BIGINT</td></tr>
+<tr><td>TIMESTAMP</td><td>LONG</td><td><code>0</code>, meaning 1970-01-01 00:00:00 UTC</td><td>Druid's <code>__time</code> column is reported as TIMESTAMP. Casts between string and timestamp types assume standard SQL formatting, e.g. <code>2000-01-02 03:04:05</code>, <em>not</em> ISO8601 formatting. For handling other formats, use one of the <a href="#time-functions">time functions</a></td></tr>
+<tr><td>DATE</td><td>LONG</td><td><code>0</code>, meaning 1970-01-01</td><td>Casting TIMESTAMP to DATE rounds down the timestamp to the nearest day. Casts between string and date types assume standard SQL formatting, e.g. <code>2000-01-02</code>. For handling other formats, use one of the <a href="#time-functions">time functions</a></td></tr>
+<tr><td>OTHER</td><td>COMPLEX</td><td>none</td><td>May represent various Druid column types such as hyperUnique, approxHistogram, etc</td></tr>
+</tbody>
+</table>
+<h3><a class="anchor" aria-hidden="true" id="multi-value-strings"></a><a href="#multi-value-strings" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Multi-value strings</h3>
+<p>Druid's native type system allows strings to potentially have multiple values. These
+<a href="multi-value-dimensions.html">multi-value string dimensions</a> will be reported in SQL as <code>VARCHAR</code> typed, and can be
+syntactically used like any other VARCHAR. Regular string functions that refer to multi-value string dimensions will be
+applied to all values for each row individually. Multi-value string dimensions can also be treated as arrays via special
+<a href="#multi-value-string-functions">multi-value string functions</a>, which can perform powerful array-aware operations.</p>
+<p>Grouping by a multi-value expression will observe the native Druid multi-value aggregation behavior, which is similar to
+the <code>UNNEST</code> functionality available in some other SQL dialects. Refer to the documentation on
+<a href="multi-value-dimensions.html">multi-value string dimensions</a> for additional details.</p>
+<blockquote>
+<p>Because multi-value dimensions are treated by the SQL planner as <code>VARCHAR</code>, there are some inconsistencies between how
+they are handled in Druid SQL and in native queries. For example, expressions involving multi-value dimensions may be
+incorrectly optimized by the Druid SQL planner: <code>multi_val_dim = 'a' AND multi_val_dim = 'b'</code> will be optimized to
+<code>false</code>, even though it is possible for a single row to have both &quot;a&quot; and &quot;b&quot; as values for <code>multi_val_dim</code>. The
+SQL behavior of multi-value dimensions will change in a future release to more closely align with their behavior
+in native queries.</p>
+</blockquote>
+<h3><a class="anchor" aria-hidden="true" id="null-values"></a><a href="#null-values" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>NULL values</h3>
+<p>The <code>druid.generic.useDefaultValueForNull</code> <a href="../configuration/index.html#sql-compatible-null-handling">runtime property</a>
+controls Druid's NULL handling mode.</p>
+<p>In the default mode (<code>true</code>), Druid treats NULLs and empty strings interchangeably, rather than according to the SQL
+standard. In this mode Druid SQL only has partial support for NULLs. For example, the expressions <code>col IS NULL</code> and
+<code>col = ''</code> are equivalent, and both will evaluate to true if <code>col</code> contains an empty string. Similarly, the expression
+<code>COALESCE(col1, col2)</code> will return <code>col2</code> if <code>col1</code> is an empty string. While the <code>COUNT(*)</code> aggregator counts all rows,
+the <code>COUNT(expr)</code> aggregator will count the number of rows where expr is neither null nor the empty string. Numeric
+columns in this mode are not nullable; any null or missing values will be treated as zeroes.</p>
+<p>In SQL compatible mode (<code>false</code>), NULLs are treated more closely to the SQL standard. The property affects both storage
+and querying, so for best behavior, it should be set at both ingestion time and query time. There is some overhead
+associated with the ability to handle NULLs; see the <a href="/docs/0.20.0/design/segments.html#sql-compatible-null-handling">segment internals</a>
+documentation for more details.</p>
+<h2><a class="anchor" aria-hidden="true" id="aggregation-functions"></a><a href="#aggregation-functions" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Aggregation functions</h2>
+<p>Aggregation functions can appear in the SELECT clause of any query. Any aggregator can be filtered using syntax like
+<code>AGG(expr) FILTER(WHERE whereExpr)</code>. Filtered aggregators will only aggregate rows that match their filter. It's
+possible for two aggregators in the same SQL query to have different filters.</p>
+<p>Only the COUNT aggregation can accept DISTINCT.</p>
+<blockquote>
+<p>The order of aggregation operations across segments is not deterministic. This means that non-commutative aggregation
+functions can produce inconsistent results across the same query.</p>
+<p>Functions that operate on an input type of &quot;float&quot; or &quot;double&quot; may also see these differences in aggregation
+results across multiple query runs because of this. If precisely the same value is desired across multiple query runs,
+consider using the <code>ROUND</code> function to smooth out the inconsistencies between queries.</p>
+</blockquote>
+<table>
+<thead>
+<tr><th>Function</th><th>Notes</th></tr>
+</thead>
+<tbody>
+<tr><td><code>COUNT(*)</code></td><td>Counts the number of rows.</td></tr>
+<tr><td><code>COUNT(DISTINCT expr)</code></td><td>Counts distinct values of expr, which can be string, numeric, or hyperUnique. By default this is approximate, using a variant of <a href="http://algo.inria.fr/flajolet/Publications/FlFuGaMe07.pdf">HyperLogLog</a>. To get exact counts set &quot;useApproximateCountDistinct&quot; to &quot;false&quot;. If you do this, expr must be string or numeric, since exact counts are not possible using hyperUnique columns. See also <code>APPROX_COUNT_DISTINCT(expr)</code>. In exact mode, only one distinct count per query is permitted.</td></tr>
+<tr><td><code>SUM(expr)</code></td><td>Sums numbers.</td></tr>
+<tr><td><code>MIN(expr)</code></td><td>Takes the minimum of numbers.</td></tr>
+<tr><td><code>MAX(expr)</code></td><td>Takes the maximum of numbers.</td></tr>
+<tr><td><code>AVG(expr)</code></td><td>Averages numbers.</td></tr>
+<tr><td><code>APPROX_COUNT_DISTINCT(expr)</code></td><td>Counts distinct values of expr, which can be a regular column or a hyperUnique column. This is always approximate, regardless of the value of &quot;useApproximateCountDistinct&quot;. This uses Druid's built-in &quot;cardinality&quot; or &quot;hyperUnique&quot; aggregators. See also <code>COUNT(DISTINCT expr)</code>.</td></tr>
+<tr><td><code>APPROX_COUNT_DISTINCT_DS_HLL(expr, [lgK, tgtHllType])</code></td><td>Counts distinct values of expr, which can be a regular column or an <a href="../development/extensions-core/datasketches-hll.html">HLL sketch</a> column. The <code>lgK</code> and <code>tgtHllType</code> parameters are described in the HLL sketch documentation. This is always approximate, regardless of the value of &quot;useApproximateCountDistinct&quot;. See also <code>COUNT(DISTINCT expr)</code>. The <a href="../development/extensions-core/datasketches-extension.html">DataSketches extension</a> must be loaded to use this function.</td></tr>
+<tr><td><code>APPROX_COUNT_DISTINCT_DS_THETA(expr, [size])</code></td><td>Counts distinct values of expr, which can be a regular column or a <a href="../development/extensions-core/datasketches-theta.html">Theta sketch</a> column. The <code>size</code> parameter is described in the Theta sketch documentation. This is always approximate, regardless of the value of &quot;useApproximateCountDistinct&quot;. See also <code>COUNT(DISTINCT expr)</code>. The <a href="../development/extensions-core/datasketches-extension.html">DataSketches extension</a> must be loaded to use this function.</td></tr>
+<tr><td><code>DS_HLL(expr, [lgK, tgtHllType])</code></td><td>Creates an <a href="../development/extensions-core/datasketches-hll.html">HLL sketch</a> on the values of expr, which can be a regular column or a column containing HLL sketches. The <code>lgK</code> and <code>tgtHllType</code> parameters are described in the HLL sketch documentation. The <a href="../development/extensions-core/datasketches-extension.html">DataSketches extension</a> must be loaded to use this function.</td></tr>
+<tr><td><code>DS_THETA(expr, [size])</code></td><td>Creates a <a href="../development/extensions-core/datasketches-theta.html">Theta sketch</a> on the values of expr, which can be a regular column or a column containing Theta sketches. The <code>size</code> parameter is described in the Theta sketch documentation. The <a href="../development/extensions-core/datasketches-extension.html">DataSketches extension</a> must be loaded to use this function.</td></tr>
+<tr><td><code>APPROX_QUANTILE(expr, probability, [resolution])</code></td><td>Computes approximate quantiles on numeric or <a href="../development/extensions-core/approximate-histograms.html#approximate-histogram-aggregator">approxHistogram</a> exprs. The &quot;probability&quot; should be between 0 and 1 (exclusive). The &quot;resolution&quot; is the number of centroids to use for the computation. Higher resolutions will give more precise results but also have higher overhead. If not provided, the default resolution is 50. The <a href="../development/extensions-core/approximate-histograms.html">approximate histogram extension</a> must be loaded to use this function.</td></tr>
+<tr><td><code>APPROX_QUANTILE_DS(expr, probability, [k])</code></td><td>Computes approximate quantiles on numeric or <a href="../development/extensions-core/datasketches-quantiles.html">Quantiles sketch</a> exprs. The &quot;probability&quot; should be between 0 and 1 (exclusive). The <code>k</code> parameter is described in the Quantiles sketch documentation. The <a href="../development/extensions-core/datasketches-extension.html">DataSketches extension</a> must be loaded to use this function.</td></tr>
+<tr><td><code>APPROX_QUANTILE_FIXED_BUCKETS(expr, probability, numBuckets, lowerLimit, upperLimit, [outlierHandlingMode])</code></td><td>Computes approximate quantiles on numeric or <a href="../development/extensions-core/approximate-histograms.html#fixed-buckets-histogram">fixed buckets histogram</a> exprs. The &quot;probability&quot; should be between 0 and 1 (exclusive). The <code>numBuckets</code>, <code>lowerLimit</code>, <code>upperLimit</code>, and <code>outlierHandlingMode</code> parameters are described in the fixed buckets histogram documentation. The <a href="../development/extensions-core/approximate-histograms.html">approximate histogram extension</a> must be loaded to use this function.</td></tr>
+<tr><td><code>DS_QUANTILES_SKETCH(expr, [k])</code></td><td>Creates a <a href="../development/extensions-core/datasketches-quantiles.html">Quantiles sketch</a> on the values of expr, which can be a regular column or a column containing quantiles sketches. The <code>k</code> parameter is described in the Quantiles sketch documentation. The <a href="../development/extensions-core/datasketches-extension.html">DataSketches extension</a> must be loaded to use this function.</td></tr>
+<tr><td><code>BLOOM_FILTER(expr, numEntries)</code></td><td>Computes a bloom filter from values produced by <code>expr</code>, with <code>numEntries</code> maximum number of distinct values before false positive rate increases. See <a href="../development/extensions-core/bloom-filter.html">bloom filter extension</a> documentation for additional details.</td></tr>
+<tr><td><code>TDIGEST_QUANTILE(expr, quantileFraction, [compression])</code></td><td>Builds a T-Digest sketch on values produced by <code>expr</code> and returns the value for the quantile. Compression parameter (default value 100) determines the accuracy and size of the sketch. Higher compression means higher accuracy but more space to store sketches. See <a href="../development/extensions-contrib/tdigestsketch-quantiles.html">t-digest extension</a> documentation for additional details.</td></tr>
+<tr><td><code>TDIGEST_GENERATE_SKETCH(expr, [compression])</code></td><td>Builds a T-Digest sketch on values produced by <code>expr</code>. Compression parameter (default value 100) determines the accuracy and size of the sketch Higher compression means higher accuracy but more space to store sketches. See <a href="../development/extensions-contrib/tdigestsketch-quantiles.html">t-digest extension</a> documentation for additional details.</td></tr>
+<tr><td><code>VAR_POP(expr)</code></td><td>Computes variance population of <code>expr</code>. See <a href="../development/extensions-core/stats.html">stats extension</a> documentation for additional details.</td></tr>
+<tr><td><code>VAR_SAMP(expr)</code></td><td>Computes variance sample of <code>expr</code>. See <a href="../development/extensions-core/stats.html">stats extension</a> documentation for additional details.</td></tr>
+<tr><td><code>VARIANCE(expr)</code></td><td>Computes variance sample of <code>expr</code>. See <a href="../development/extensions-core/stats.html">stats extension</a> documentation for additional details.</td></tr>
+<tr><td><code>STDDEV_POP(expr)</code></td><td>Computes standard deviation population of <code>expr</code>. See <a href="../development/extensions-core/stats.html">stats extension</a> documentation for additional details.</td></tr>
+<tr><td><code>STDDEV_SAMP(expr)</code></td><td>Computes standard deviation sample of <code>expr</code>. See <a href="../development/extensions-core/stats.html">stats extension</a> documentation for additional details.</td></tr>
+<tr><td><code>STDDEV(expr)</code></td><td>Computes standard deviation sample of <code>expr</code>. See <a href="../development/extensions-core/stats.html">stats extension</a> documentation for additional details.</td></tr>
+<tr><td><code>EARLIEST(expr)</code></td><td>Returns the earliest value of <code>expr</code>, which must be numeric. If <code>expr</code> comes from a relation with a timestamp column (like a Druid datasource) then &quot;earliest&quot; is the value first encountered with the minimum overall timestamp of all values being aggregated. If <code>expr</code> does not come from a relation with a timestamp, then it is simply the first value encountered.</td></tr>
+<tr><td><code>EARLIEST(expr, maxBytesPerString)</code></td><td>Like <code>EARLIEST(expr)</code>, but for strings. The <code>maxBytesPerString</code> parameter determines how much aggregation space to allocate per string. Strings longer than this limit will be truncated. This parameter should be set as low as possible, since high values will lead to wasted memory.</td></tr>
+<tr><td><code>LATEST(expr)</code></td><td>Returns the latest value of <code>expr</code>, which must be numeric. If <code>expr</code> comes from a relation with a timestamp column (like a Druid datasource) then &quot;latest&quot; is the value last encountered with the maximum overall timestamp of all values being aggregated. If <code>expr</code> does not come from a relation with a timestamp, then it is simply the last value encountered.</td></tr>
+<tr><td><code>LATEST(expr, maxBytesPerString)</code></td><td>Like <code>LATEST(expr)</code>, but for strings. The <code>maxBytesPerString</code> parameter determines how much aggregation space to allocate per string. Strings longer than this limit will be truncated. This parameter should be set as low as possible, since high values will lead to wasted memory.</td></tr>
+<tr><td><code>ANY_VALUE(expr)</code></td><td>Returns any value of <code>expr</code> including null. <code>expr</code> must be numeric. This aggregator can simplify and optimize the performance by returning the first encountered value (including null)</td></tr>
+<tr><td><code>ANY_VALUE(expr, maxBytesPerString)</code></td><td>Like <code>ANY_VALUE(expr)</code>, but for strings. The <code>maxBytesPerString</code> parameter determines how much aggregation space to allocate per string. Strings longer than this limit will be truncated. This parameter should be set as low as possible, since high values will lead to wasted memory.</td></tr>
+</tbody>
+</table>
+<p>For advice on choosing approximate aggregation functions, check out our <a href="aggregations.html#approx">approximate aggregations documentation</a>.</p>
+<h2><a class="anchor" aria-hidden="true" id="scalar-functions"></a><a href="#scalar-functions" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Scalar functions</h2>
+<h3><a class="anchor" aria-hidden="true" id="numeric-functions"></a><a href="#numeric-functions" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Numeric functions</h3>
+<p>For mathematical operations, Druid SQL will use integer math if all operands involved in an expression are integers.
+Otherwise, Druid will switch to floating point math. You can force this to happen by casting one of your operands
+to FLOAT. At runtime, Druid will widen 32-bit floats to 64-bit for most expressions.</p>
+<table>
+<thead>
+<tr><th>Function</th><th>Notes</th></tr>
+</thead>
+<tbody>
+<tr><td><code>ABS(expr)</code></td><td>Absolute value.</td></tr>
+<tr><td><code>CEIL(expr)</code></td><td>Ceiling.</td></tr>
+<tr><td><code>EXP(expr)</code></td><td>e to the power of expr.</td></tr>
+<tr><td><code>FLOOR(expr)</code></td><td>Floor.</td></tr>
+<tr><td><code>LN(expr)</code></td><td>Logarithm (base e).</td></tr>
+<tr><td><code>LOG10(expr)</code></td><td>Logarithm (base 10).</td></tr>
+<tr><td><code>POWER(expr, power)</code></td><td>expr to a power.</td></tr>
+<tr><td><code>SQRT(expr)</code></td><td>Square root.</td></tr>
+<tr><td><code>TRUNCATE(expr[, digits])</code></td><td>Truncate expr to a specific number of decimal digits. If digits is negative, then this truncates that many places to the left of the decimal point. Digits defaults to zero if not specified.</td></tr>
+<tr><td><code>TRUNC(expr[, digits])</code></td><td>Synonym for <code>TRUNCATE</code>.</td></tr>
+<tr><td><code>ROUND(expr[, digits])</code></td><td><code>ROUND(x, y)</code> would return the value of the x rounded to the y decimal places. While x can be an integer or floating-point number, y must be an integer. The type of the return value is specified by that of x. y defaults to 0 if omitted. When y is negative, x is rounded on the left side of the y decimal points. If <code>expr</code> evaluates to either <code>NaN</code>, <code>expr</code> will be converted to 0. If <code>expr</code> is infinity, <code>expr</code> will be converted to the nearest finite double.</td></tr>
+<tr><td><code>x + y</code></td><td>Addition.</td></tr>
+<tr><td><code>x - y</code></td><td>Subtraction.</td></tr>
+<tr><td><code>x * y</code></td><td>Multiplication.</td></tr>
+<tr><td><code>x / y</code></td><td>Division.</td></tr>
+<tr><td><code>MOD(x, y)</code></td><td>Modulo (remainder of x divided by y).</td></tr>
+<tr><td><code>SIN(expr)</code></td><td>Trigonometric sine of an angle expr.</td></tr>
+<tr><td><code>COS(expr)</code></td><td>Trigonometric cosine of an angle expr.</td></tr>
+<tr><td><code>TAN(expr)</code></td><td>Trigonometric tangent of an angle expr.</td></tr>
+<tr><td><code>COT(expr)</code></td><td>Trigonometric cotangent of an angle expr.</td></tr>
+<tr><td><code>ASIN(expr)</code></td><td>Arc sine of expr.</td></tr>
+<tr><td><code>ACOS(expr)</code></td><td>Arc cosine of expr.</td></tr>
+<tr><td><code>ATAN(expr)</code></td><td>Arc tangent of expr.</td></tr>
+<tr><td><code>ATAN2(y, x)</code></td><td>Angle theta from the conversion of rectangular coordinates (x, y) to polar * coordinates (r, theta).</td></tr>
+<tr><td><code>DEGREES(expr)</code></td><td>Converts an angle measured in radians to an approximately equivalent angle measured in degrees</td></tr>
+<tr><td><code>RADIANS(expr)</code></td><td>Converts an angle measured in degrees to an approximately equivalent angle measured in radians</td></tr>
+</tbody>
+</table>
+<h3><a class="anchor" aria-hidden="true" id="string-functions"></a><a href="#string-functions" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>String functions</h3>
+<p>String functions accept strings, and return a type appropriate to the function.</p>
+<table>
+<thead>
+<tr><th>Function</th><th>Notes</th></tr>
+</thead>
+<tbody>
+<tr><td><code>x || y</code></td><td>Concat strings x and y.</td></tr>
+<tr><td><code>CONCAT(expr, expr...)</code></td><td>Concats a list of expressions.</td></tr>
+<tr><td><code>TEXTCAT(expr, expr)</code></td><td>Two argument version of CONCAT.</td></tr>
+<tr><td><code>STRING_FORMAT(pattern[, args...])</code></td><td>Returns a string formatted in the manner of Java's <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html#format-java.lang.String-java.lang.Object...-">String.format</a>.</td></tr>
+<tr><td><code>LENGTH(expr)</code></td><td>Length of expr in UTF-16 code units.</td></tr>
+<tr><td><code>CHAR_LENGTH(expr)</code></td><td>Synonym for <code>LENGTH</code>.</td></tr>
+<tr><td><code>CHARACTER_LENGTH(expr)</code></td><td>Synonym for <code>LENGTH</code>.</td></tr>
+<tr><td><code>STRLEN(expr)</code></td><td>Synonym for <code>LENGTH</code>.</td></tr>
+<tr><td><code>LOOKUP(expr, lookupName)</code></td><td>Look up expr in a registered <a href="lookups.html">query-time lookup table</a>. Note that lookups can also be queried directly using the <a href="#from"><code>lookup</code> schema</a>.</td></tr>
+<tr><td><code>LOWER(expr)</code></td><td>Returns expr in all lowercase.</td></tr>
+<tr><td><code>PARSE_LONG(string[, radix])</code></td><td>Parses a string into a long (BIGINT) with the given radix, or 10 (decimal) if a radix is not provided.</td></tr>
+<tr><td><code>POSITION(needle IN haystack [FROM fromIndex])</code></td><td>Returns the index of needle within haystack, with indexes starting from 1. The search will begin at fromIndex, or 1 if fromIndex is not specified. If the needle is not found, returns 0.</td></tr>
+<tr><td><code>REGEXP_EXTRACT(expr, pattern, [index])</code></td><td>Apply regular expression <code>pattern</code> to <code>expr</code> and extract a capture group, or <code>NULL</code> if there is no match. If index is unspecified or zero, returns the first substring that matched the pattern. The pattern may match anywhere inside <code>expr</code>; if you want to match the entire string instead, use the <code>^</code> and <code>$</code> markers at the start and end of your pattern. Note: when <code>druid.generic.useDefaultValueForNull = true</code>, it is not possible to differentiate an empty-string match from a non-match (both will return <code>NULL</code>).</td></tr>
+<tr><td><code>REGEXP_LIKE(expr, pattern)</code></td><td>Returns whether <code>expr</code> matches regular expression <code>pattern</code>. The pattern may match anywhere inside <code>expr</code>; if you want to match the entire string instead, use the <code>^</code> and <code>$</code> markers at the start and end of your pattern. Similar to <a href="#comparison-operators"><code>LIKE</code></a>, but uses regexps instead of LIKE patterns. Especially useful in WHERE clauses.</td></tr>
+<tr><td><code>CONTAINS_STRING(&lt;expr&gt;, str)</code></td><td>Returns true if the <code>str</code> is a substring of <code>expr</code>.</td></tr>
+<tr><td><code>ICONTAINS_STRING(&lt;expr&gt;, str)</code></td><td>Returns true if the <code>str</code> is a substring of <code>expr</code>. The match is case-insensitive.</td></tr>
+<tr><td><code>REPLACE(expr, pattern, replacement)</code></td><td>Replaces pattern with replacement in expr, and returns the result.</td></tr>
+<tr><td><code>STRPOS(haystack, needle)</code></td><td>Returns the index of needle within haystack, with indexes starting from 1. If the needle is not found, returns 0.</td></tr>
+<tr><td><code>SUBSTRING(expr, index, [length])</code></td><td>Returns a substring of expr starting at index, with a max length, both measured in UTF-16 code units.</td></tr>
+<tr><td><code>RIGHT(expr, [length])</code></td><td>Returns the rightmost length characters from expr.</td></tr>
+<tr><td><code>LEFT(expr, [length])</code></td><td>Returns the leftmost length characters from expr.</td></tr>
+<tr><td><code>SUBSTR(expr, index, [length])</code></td><td>Synonym for SUBSTRING.</td></tr>
+<tr><td><code>TRIM([BOTH | LEADING | TRAILING] [<chars> FROM] expr)</code></td><td>Returns expr with characters removed from the leading, trailing, or both ends of &quot;expr&quot; if they are in &quot;chars&quot;. If &quot;chars&quot; is not provided, it defaults to &quot; &quot; (a space). If the directional argument is not provided, it defaults to &quot;BOTH&quot;.</td></tr>
+<tr><td><code>BTRIM(expr[, chars])</code></td><td>Alternate form of <code>TRIM(BOTH &lt;chars&gt; FROM &lt;expr&gt;)</code>.</td></tr>
+<tr><td><code>LTRIM(expr[, chars])</code></td><td>Alternate form of <code>TRIM(LEADING &lt;chars&gt; FROM &lt;expr&gt;)</code>.</td></tr>
+<tr><td><code>RTRIM(expr[, chars])</code></td><td>Alternate form of <code>TRIM(TRAILING &lt;chars&gt; FROM &lt;expr&gt;)</code>.</td></tr>
+<tr><td><code>UPPER(expr)</code></td><td>Returns expr in all uppercase.</td></tr>
+<tr><td><code>REVERSE(expr)</code></td><td>Reverses expr.</td></tr>
+<tr><td><code>REPEAT(expr, [N])</code></td><td>Repeats expr N times</td></tr>
+<tr><td><code>LPAD(expr, length[, chars])</code></td><td>Returns a string of <code>length</code> from <code>expr</code> left-padded with <code>chars</code>. If <code>length</code> is shorter than the length of <code>expr</code>, the result is <code>expr</code> which is truncated to <code>length</code>. The result will be null if either <code>expr</code> or <code>chars</code> is null. If <code>chars</code> is an empty string, no padding is added, however <code>expr</code> may be trimmed if necessary.</td></tr>
+<tr><td><code>RPAD(expr, length[, chars])</code></td><td>Returns a string of <code>length</code> from <code>expr</code> right-padded with <code>chars</code>. If <code>length</code> is shorter than the length of <code>expr</code>, the result is <code>expr</code> which is truncated to <code>length</code>. The result will be null if either <code>expr</code> or <code>chars</code> is null. If <code>chars</code> is an empty string, no padding is added, however <code>expr</code> may be trimmed if necessary.</td></tr>
+</tbody>
+</table>
+<h3><a class="anchor" aria-hidden="true" id="time-functions"></a><a href="#time-functions" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Time functions</h3>
+<p>Time functions can be used with Druid's <code>__time</code> column, with any column storing millisecond timestamps through use
+of the <code>MILLIS_TO_TIMESTAMP</code> function, or with any column storing string timestamps through use of the <code>TIME_PARSE</code>
+function. By default, time operations use the UTC time zone. You can change the time zone by setting the connection
+context parameter &quot;sqlTimeZone&quot; to the name of another time zone, like &quot;America/Los_Angeles&quot;, or to an offset like
+&quot;-08:00&quot;. If you need to mix multiple time zones in the same query, or if you need to use a time zone other than
+the connection time zone, some functions also accept time zones as parameters. These parameters always take precedence
+over the connection time zone.</p>
+<p>Literal timestamps in the connection time zone can be written using <code>TIMESTAMP '2000-01-01 00:00:00'</code> syntax. The
+simplest way to write literal timestamps in other time zones is to use TIME_PARSE, like
+<code>TIME_PARSE('2000-02-01 00:00:00', NULL, 'America/Los_Angeles')</code>.</p>
+<table>
+<thead>
+<tr><th>Function</th><th>Notes</th></tr>
+</thead>
+<tbody>
+<tr><td><code>CURRENT_TIMESTAMP</code></td><td>Current timestamp in the connection's time zone.</td></tr>
+<tr><td><code>CURRENT_DATE</code></td><td>Current date in the connection's time zone.</td></tr>
+<tr><td><code>DATE_TRUNC(&lt;unit&gt;, &lt;timestamp_expr&gt;)</code></td><td>Rounds down a timestamp, returning it as a new timestamp. Unit can be 'milliseconds', 'second', 'minute', 'hour', 'day', 'week', 'month', 'quarter', 'year', 'decade', 'century', or 'millennium'.</td></tr>
+<tr><td><code>TIME_CEIL(&lt;timestamp_expr&gt;, &lt;period&gt;, [&lt;origin&gt;, [&lt;timezone&gt;]])</code></td><td>Rounds up a timestamp, returning it as a new timestamp. Period can be any ISO8601 period, like P3M (quarters) or PT12H (half-days). The time zone, if provided, should be a time zone name like &quot;America/Los_Angeles&quot; or offset like &quot;-08:00&quot;. This function is similar to <code>CEIL</code> but is more flexible.</td></tr>
+<tr><td><code>TIME_FLOOR(&lt;timestamp_expr&gt;, &lt;period&gt;, [&lt;origin&gt;, [&lt;timezone&gt;]])</code></td><td>Rounds down a timestamp, returning it as a new timestamp. Period can be any ISO8601 period, like P3M (quarters) or PT12H (half-days). The time zone, if provided, should be a time zone name like &quot;America/Los_Angeles&quot; or offset like &quot;-08:00&quot;. This function is similar to <code>FLOOR</code> but is more flexible.</td></tr>
+<tr><td><code>TIME_SHIFT(&lt;timestamp_expr&gt;, &lt;period&gt;, &lt;step&gt;, [&lt;timezone&gt;])</code></td><td>Shifts a timestamp by a period (step times), returning it as a new timestamp. Period can be any ISO8601 period. Step may be negative. The time zone, if provided, should be a time zone name like &quot;America/Los_Angeles&quot; or offset like &quot;-08:00&quot;.</td></tr>
+<tr><td><code>TIME_EXTRACT(&lt;timestamp_expr&gt;, [&lt;unit&gt;, [&lt;timezone&gt;]])</code></td><td>Extracts a time part from expr, returning it as a number. Unit can be EPOCH, SECOND, MINUTE, HOUR, DAY (day of month), DOW (day of week), DOY (day of year), WEEK (week of <a href="https://en.wikipedia.org/wiki/ISO_week_date">week year</a>), MONTH (1 through 12), QUARTER (1 through 4), or YEAR. The time zone, if provided, should be a time zone name like &quot;America/Los_Angeles&quot; or offset like &quot;-08:00&quot;. This function is similar to <code>EXTRACT</code> but is more flexible. Unit and time zone must be literals, and must be provided quoted, like <code>TIME_EXTRACT(__time, 'HOUR')</code> or <code>TIME_EXTRACT(__time, 'HOUR', 'America/Los_Angeles')</code>.</td></tr>
+<tr><td><code>TIME_PARSE(&lt;string_expr&gt;, [&lt;pattern&gt;, [&lt;timezone&gt;]])</code></td><td>Parses a string into a timestamp using a given <a href="http://www.joda.org/joda-time/apidocs/org/joda/time/format/DateTimeFormat.html">Joda DateTimeFormat pattern</a>, or ISO8601 (e.g. <code>2000-01-02T03:04:05Z</code>) if the pattern is not provided. The time zone, if provided, should be a time zone name like &quot;America/Los_Angeles&quot; or offset like &quot;-08:00&quot;, and will be used as the time zone for strings that do not include a time zone offset. Pattern and time zone must be literals. Strings that cannot be parsed as timestamps will be returned as NULL.</td></tr>
+<tr><td><code>TIME_FORMAT(&lt;timestamp_expr&gt;, [&lt;pattern&gt;, [&lt;timezone&gt;]])</code></td><td>Formats a timestamp as a string with a given <a href="http://www.joda.org/joda-time/apidocs/org/joda/time/format/DateTimeFormat.html">Joda DateTimeFormat pattern</a>, or ISO8601 (e.g. <code>2000-01-02T03:04:05Z</code>) if the pattern is not provided. The time zone, if provided, should be a time zone name like &quot;America/Los_Angeles&quot; or offset like &quot;-08:00&quot;. Pattern and time zone must be literals.</td></tr>
+<tr><td><code>MILLIS_TO_TIMESTAMP(millis_expr)</code></td><td>Converts a number of milliseconds since the epoch into a timestamp.</td></tr>
+<tr><td><code>TIMESTAMP_TO_MILLIS(timestamp_expr)</code></td><td>Converts a timestamp into a number of milliseconds since the epoch.</td></tr>
+<tr><td><code>EXTRACT(&lt;unit&gt; FROM timestamp_expr)</code></td><td>Extracts a time part from expr, returning it as a number. Unit can be EPOCH, MICROSECOND, MILLISECOND, SECOND, MINUTE, HOUR, DAY (day of month), DOW (day of week), ISODOW (ISO day of week), DOY (day of year), WEEK (week of year), MONTH, QUARTER, YEAR, ISOYEAR, DECADE, CENTURY or MILLENNIUM. Units must be provided unquoted, like <code>EXTRACT(HOUR FROM __time)</code>.</td></tr>
+<tr><td><code>FLOOR(timestamp_expr TO &lt;unit&gt;)</code></td><td>Rounds down a timestamp, returning it as a new timestamp. Unit can be SECOND, MINUTE, HOUR, DAY, WEEK, MONTH, QUARTER, or YEAR.</td></tr>
+<tr><td><code>CEIL(timestamp_expr TO &lt;unit&gt;)</code></td><td>Rounds up a timestamp, returning it as a new timestamp. Unit can be SECOND, MINUTE, HOUR, DAY, WEEK, MONTH, QUARTER, or YEAR.</td></tr>
+<tr><td><code>TIMESTAMPADD(&lt;unit&gt;, &lt;count&gt;, &lt;timestamp&gt;)</code></td><td>Equivalent to <code>timestamp + count * INTERVAL '1' UNIT</code>.</td></tr>
+<tr><td><code>TIMESTAMPDIFF(&lt;unit&gt;, &lt;timestamp1&gt;, &lt;timestamp2&gt;)</code></td><td>Returns the (signed) number of <code>unit</code> between <code>timestamp1</code> and <code>timestamp2</code>. Unit can be SECOND, MINUTE, HOUR, DAY, WEEK, MONTH, QUARTER, or YEAR.</td></tr>
+<tr><td><code>timestamp_expr { + | - } &lt;interval_expr&gt;<code></td><td>Add or subtract an amount of time from a timestamp. interval_expr can include interval literals like <code>INTERVAL '2' HOUR</code>, and may include interval arithmetic as well. This operator treats days as uniformly 86400 seconds long, and does not take into account daylight savings time. To account for daylight savings time, use TIME_SHIFT instead.</td></tr>
+</tbody>
+</table>
+<h3><a class="anchor" aria-hidden="true" id="reduction-functions"></a><a href="#reduction-functions" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Reduction functions</h3>
+<p>Reduction functions operate on zero or more expressions and return a single expression. If no expressions are passed as
+arguments, then the result is <code>NULL</code>. The expressions must all be convertible to a common data type, which will be the
+type of the result:</p>
+<ul>
+<li>If all argument are <code>NULL</code>, the result is <code>NULL</code>. Otherwise, <code>NULL</code> arguments are ignored.</li>
+<li>If the arguments comprise a mix of numbers and strings, the arguments are interpreted as strings.</li>
+<li>If all arguments are integer numbers, the arguments are interpreted as longs.</li>
+<li>If all arguments are numbers and at least one argument is a double, the arguments are interpreted as doubles.</li>
+</ul>
+<table>
+<thead>
+<tr><th>Function</th><th>Notes</th></tr>
+</thead>
+<tbody>
+<tr><td><code>GREATEST([expr1, ...])</code></td><td>Evaluates zero or more expressions and returns the maximum value based on comparisons as described above.</td></tr>
+<tr><td><code>LEAST([expr1, ...])</code></td><td>Evaluates zero or more expressions and returns the minimum value based on comparisons as described above.</td></tr>
+</tbody>
+</table>
+<h3><a class="anchor" aria-hidden="true" id="ip-address-functions"></a><a href="#ip-address-functions" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>IP address functions</h3>
+<p>For the IPv4 address functions, the <code>address</code> argument can either be an IPv4 dotted-decimal string
+(e.g., '192.168.0.1') or an IP address represented as an integer (e.g., 3232235521). The <code>subnet</code>
+argument should be a string formatted as an IPv4 address subnet in CIDR notation (e.g.,
+'192.168.0.0/16').</p>
+<table>
+<thead>
+<tr><th>Function</th><th>Notes</th></tr>
+</thead>
+<tbody>
+<tr><td><code>IPV4_MATCH(address, subnet)</code></td><td>Returns true if the <code>address</code> belongs to the <code>subnet</code> literal, else false. If <code>address</code> is not a valid IPv4 address, then false is returned. This function is more efficient if <code>address</code> is an integer instead of a string.</td></tr>
+<tr><td><code>IPV4_PARSE(address)</code></td><td>Parses <code>address</code> into an IPv4 address stored as an integer . If <code>address</code> is an integer that is a valid IPv4 address, then it is passed through. Returns null if <code>address</code> cannot be represented as an IPv4 address.</td></tr>
+<tr><td><code>IPV4_STRINGIFY(address)</code></td><td>Converts <code>address</code> into an IPv4 address dotted-decimal string. If <code>address</code> is a string that is a valid IPv4 address, then it is passed through. Returns null if <code>address</code> cannot be represented as an IPv4 address.</td></tr>
+</tbody>
+</table>
+<h3><a class="anchor" aria-hidden="true" id="comparison-operators"></a><a href="#comparison-operators" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Comparison operators</h3>
+<table>
+<thead>
+<tr><th>Function</th><th>Notes</th></tr>
+</thead>
+<tbody>
+<tr><td><code>x = y</code></td><td>Equals.</td></tr>
+<tr><td><code>x &lt;&gt; y</code></td><td>Not-equals.</td></tr>
+<tr><td><code>x &gt; y</code></td><td>Greater than.</td></tr>
+<tr><td><code>x &gt;= y</code></td><td>Greater than or equal to.</td></tr>
+<tr><td><code>x &lt; y</code></td><td>Less than.</td></tr>
+<tr><td><code>x &lt;= y</code></td><td>Less than or equal to.</td></tr>
+<tr><td><code>x BETWEEN y AND z</code></td><td>Equivalent to <code>x &gt;= y AND x &lt;= z</code>.</td></tr>
+<tr><td><code>x NOT BETWEEN y AND z</code></td><td>Equivalent to <code>x &lt; y OR x &gt; z</code>.</td></tr>
+<tr><td><code>x LIKE pattern [ESCAPE esc]</code></td><td>True if x matches a SQL LIKE pattern (with an optional escape).</td></tr>
+<tr><td><code>x NOT LIKE pattern [ESCAPE esc]</code></td><td>True if x does not match a SQL LIKE pattern (with an optional escape).</td></tr>
+<tr><td><code>x IS NULL</code></td><td>True if x is NULL or empty string.</td></tr>
+<tr><td><code>x IS NOT NULL</code></td><td>True if x is neither NULL nor empty string.</td></tr>
+<tr><td><code>x IS TRUE</code></td><td>True if x is true.</td></tr>
+<tr><td><code>x IS NOT TRUE</code></td><td>True if x is not true.</td></tr>
+<tr><td><code>x IS FALSE</code></td><td>True if x is false.</td></tr>
+<tr><td><code>x IS NOT FALSE</code></td><td>True if x is not false.</td></tr>
+<tr><td><code>x IN (values)</code></td><td>True if x is one of the listed values.</td></tr>
+<tr><td><code>x NOT IN (values)</code></td><td>True if x is not one of the listed values.</td></tr>
+<tr><td><code>x IN (subquery)</code></td><td>True if x is returned by the subquery. This will be translated into a join; see <a href="#query-translation">Query translation</a> for details.</td></tr>
+<tr><td><code>x NOT IN (subquery)</code></td><td>True if x is not returned by the subquery. This will be translated into a join; see <a href="#query-translation">Query translation</a> for details.</td></tr>
+<tr><td><code>x AND y</code></td><td>Boolean AND.</td></tr>
+<tr><td><code>x OR y</code></td><td>Boolean OR.</td></tr>
+<tr><td><code>NOT x</code></td><td>Boolean NOT.</td></tr>
+</tbody>
+</table>
+<h3><a class="anchor" aria-hidden="true" id="sketch-functions"></a><a href="#sketch-functions" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Sketch functions</h3>
+<p>These functions operate on expressions or columns that return sketch objects.</p>
+<h4><a class="anchor" aria-hidden="true" id="hll-sketch-functions"></a><a href="#hll-sketch-functions" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>HLL sketch functions</h4>
+<p>The following functions operate on <a href="../development/extensions-core/datasketches-hll.html">DataSketches HLL sketches</a>.
+The <a href="../development/extensions-core/datasketches-extension.html">DataSketches extension</a> must be loaded to use the following functions.</p>
+<table>
+<thead>
+<tr><th>Function</th><th>Notes</th></tr>
+</thead>
+<tbody>
+<tr><td><code>HLL_SKETCH_ESTIMATE(expr, [round])</code></td><td>Returns the distinct count estimate from an HLL sketch. <code>expr</code> must return an HLL sketch. The optional <code>round</code> boolean parameter will round the estimate if set to <code>true</code>, with a default of <code>false</code>.</td></tr>
+<tr><td><code>HLL_SKETCH_ESTIMATE_WITH_ERROR_BOUNDS(expr, [numStdDev])</code></td><td>Returns the distinct count estimate and error bounds from an HLL sketch. <code>expr</code> must return an HLL sketch. An optional <code>numStdDev</code> argument can be provided.</td></tr>
+<tr><td><code>HLL_SKETCH_UNION([lgK, tgtHllType], expr0, expr1, ...)</code></td><td>Returns a union of HLL sketches, where each input expression must return an HLL sketch. The <code>lgK</code> and <code>tgtHllType</code> can be optionally specified as the first parameter; if provided, both optional parameters must be specified.</td></tr>
+<tr><td><code>HLL_SKETCH_TO_STRING(expr)</code></td><td>Returns a human-readable string representation of an HLL sketch for debugging. <code>expr</code> must return an HLL sketch.</td></tr>
+</tbody>
+</table>
+<h4><a class="anchor" aria-hidden="true" id="theta-sketch-functions"></a><a href="#theta-sketch-functions" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Theta sketch functions</h4>
+<p>The following functions operate on <a href="../development/extensions-core/datasketches-theta.html">theta sketches</a>.
+The <a href="../development/extensions-core/datasketches-extension.html">DataSketches extension</a> must be loaded to use the following functions.</p>
+<table>
+<thead>
+<tr><th>Function</th><th>Notes</th></tr>
+</thead>
+<tbody>
+<tr><td><code>THETA_SKETCH_ESTIMATE(expr)</code></td><td>Returns the distinct count estimate from a theta sketch. <code>expr</code> must return a theta sketch.</td></tr>
+<tr><td><code>THETA_SKETCH_ESTIMATE_WITH_ERROR_BOUNDS(expr, errorBoundsStdDev)</code></td><td>Returns the distinct count estimate and error bounds from a theta sketch. <code>expr</code> must return a theta sketch.</td></tr>
+<tr><td><code>THETA_SKETCH_UNION([size], expr0, expr1, ...)</code></td><td>Returns a union of theta sketches, where each input expression must return a theta sketch. The <code>size</code> can be optionally specified as the first parameter.</td></tr>
+<tr><td><code>THETA_SKETCH_INTERSECT([size], expr0, expr1, ...)</code></td><td>Returns an intersection of theta sketches, where each input expression must return a theta sketch. The <code>size</code> can be optionally specified as the first parameter.</td></tr>
+<tr><td><code>THETA_SKETCH_NOT([size], expr0, expr1, ...)</code></td><td>Returns a set difference of theta sketches, where each input expression must return a theta sketch. The <code>size</code> can be optionally specified as the first parameter.</td></tr>
+</tbody>
+</table>
+<h4><a class="anchor" aria-hidden="true" id="quantiles-sketch-functions"></a><a href="#quantiles-sketch-functions" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Quantiles sketch functions</h4>
+<p>The following functions operate on <a href="../development/extensions-core/datasketches-quantiles.html">quantiles sketches</a>.
+The <a href="../development/extensions-core/datasketches-extension.html">DataSketches extension</a> must be loaded to use the following functions.</p>
+<table>
+<thead>
+<tr><th>Function</th><th>Notes</th></tr>
+</thead>
+<tbody>
+<tr><td><code>DS_GET_QUANTILE(expr, fraction)</code></td><td>Returns the quantile estimate corresponding to <code>fraction</code> from a quantiles sketch. <code>expr</code> must return a quantiles sketch.</td></tr>
+<tr><td><code>DS_GET_QUANTILES(expr, fraction0, fraction1, ...)</code></td><td>Returns a string representing an array of quantile estimates corresponding to a list of fractions from a quantiles sketch. <code>expr</code> must return a quantiles sketch.</td></tr>
+<tr><td><code>DS_HISTOGRAM(expr, splitPoint0, splitPoint1, ...)</code></td><td>Returns a string representing an approximation to the histogram given a list of split points that define the histogram bins from a quantiles sketch. <code>expr</code> must return a quantiles sketch.</td></tr>
+<tr><td><code>DS_CDF(expr, splitPoint0, splitPoint1, ...)</code></td><td>Returns a string representing approximation to the Cumulative Distribution Function given a list of split points that define the edges of the bins from a quantiles sketch. <code>expr</code> must return a quantiles sketch.</td></tr>
+<tr><td><code>DS_RANK(expr, value)</code></td><td>Returns an approximation to the rank of a given value that is the fraction of the distribution less than that value from a quantiles sketch. <code>expr</code> must return a quantiles sketch.</td></tr>
+<tr><td><code>DS_QUANTILE_SUMMARY(expr)</code></td><td>Returns a string summary of a quantiles sketch, useful for debugging. <code>expr</code> must return a quantiles sketch.</td></tr>
+</tbody>
+</table>
+<h3><a class="anchor" aria-hidden="true" id="other-scalar-functions"></a><a href="#other-scalar-functions" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Other scalar functions</h3>
+<table>
+<thead>
+<tr><th>Function</th><th>Notes</th></tr>
+</thead>
+<tbody>
+<tr><td><code>CAST(value AS TYPE)</code></td><td>Cast value to another type. See <a href="#data-types">Data types</a> for details about how Druid SQL handles CAST.</td></tr>
+<tr><td><code>CASE expr WHEN value1 THEN result1 \[ WHEN value2 THEN result2 ... \] \[ ELSE resultN \] END</code></td><td>Simple CASE.</td></tr>
+<tr><td><code>CASE WHEN boolean_expr1 THEN result1 \[ WHEN boolean_expr2 THEN result2 ... \] \[ ELSE resultN \] END</code></td><td>Searched CASE.</td></tr>
+<tr><td><code>NULLIF(value1, value2)</code></td><td>Returns NULL if value1 and value2 match, else returns value1.</td></tr>
+<tr><td><code>COALESCE(value1, value2, ...)</code></td><td>Returns the first value that is neither NULL nor empty string.</td></tr>
+<tr><td><code>NVL(expr,expr-for-null)</code></td><td>Returns 'expr-for-null' if 'expr' is null (or empty string for string type).</td></tr>
+<tr><td><code>BLOOM_FILTER_TEST(&lt;expr&gt;, &lt;serialized-filter&gt;)</code></td><td>Returns true if the value is contained in a Base64-serialized bloom filter. See the <a href="../development/extensions-core/bloom-filter.html">Bloom filter extension</a> documentation for additional details.</td></tr>
+</tbody>
+</table>
+<h2><a class="anchor" aria-hidden="true" id="multi-value-string-functions"></a><a href="#multi-value-string-functions" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Multi-value string functions</h2>
+<p>All 'array' references in the multi-value string function documentation can refer to multi-value string columns or
+<code>ARRAY</code> literals.</p>
+<table>
+<thead>
+<tr><th>Function</th><th>Notes</th></tr>
+</thead>
+<tbody>
+<tr><td><code>ARRAY(expr1,expr ...)</code></td><td>constructs a SQL ARRAY literal from the expression arguments, using the type of the first argument as the output array type</td></tr>
+<tr><td><code>MV_LENGTH(arr)</code></td><td>returns length of array expression</td></tr>
+<tr><td><code>MV_OFFSET(arr,long)</code></td><td>returns the array element at the 0 based index supplied, or null for an out of range index</td></tr>
+<tr><td><code>MV_ORDINAL(arr,long)</code></td><td>returns the array element at the 1 based index supplied, or null for an out of range index</td></tr>
+<tr><td><code>MV_CONTAINS(arr,expr)</code></td><td>returns 1 if the array contains the element specified by expr, or contains all elements specified by expr if expr is an array, else 0</td></tr>
+<tr><td><code>MV_OVERLAP(arr1,arr2)</code></td><td>returns 1 if arr1 and arr2 have any elements in common, else 0</td></tr>
+<tr><td><code>MV_OFFSET_OF(arr,expr)</code></td><td>returns the 0 based index of the first occurrence of expr in the array, or <code>-1</code> or <code>null</code> if <code>druid.generic.useDefaultValueForNull=false</code> if no matching elements exist in the array.</td></tr>
+<tr><td><code>MV_ORDINAL_OF(arr,expr)</code></td><td>returns the 1 based index of the first occurrence of expr in the array, or <code>-1</code> or <code>null</code> if <code>druid.generic.useDefaultValueForNull=false</code> if no matching elements exist in the array.</td></tr>
+<tr><td><code>MV_PREPEND(expr,arr)</code></td><td>adds expr to arr at the beginning, the resulting array type determined by the type of the array</td></tr>
+<tr><td><code>MV_APPEND(arr1,expr)</code></td><td>appends expr to arr, the resulting array type determined by the type of the first array</td></tr>
+<tr><td><code>MV_CONCAT(arr1,arr2)</code></td><td>concatenates 2 arrays, the resulting array type determined by the type of the first array</td></tr>
+<tr><td><code>MV_SLICE(arr,start,end)</code></td><td>return the subarray of arr from the 0 based index start(inclusive) to end(exclusive), or <code>null</code>, if start is less than 0, greater than length of arr or less than end</td></tr>
+<tr><td><code>MV_TO_STRING(arr,str)</code></td><td>joins all elements of arr by the delimiter specified by str</td></tr>
+<tr><td><code>STRING_TO_MV(str1,str2)</code></td><td>splits str1 into an array on the delimiter specified by str2</td></tr>
+</tbody>
+</table>
+<h2><a class="anchor" aria-hidden="true" id="query-translation"></a><a href="#query-translation" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Query translation</h2>
+<p>Druid SQL translates SQL queries to <a href="/docs/0.20.0/querying/querying.html">native queries</a> before running them, and understanding how this
+translation works is key to getting good performance.</p>
+<h3><a class="anchor" aria-hidden="true" id="best-practices"></a><a href="#best-practices" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Best practices</h3>
+<p>Consider this (non-exhaustive) list of things to look out for when looking into the performance implications of
+how your SQL queries are translated to native queries.</p>
+<ol>
+<li><p>If you wrote a filter on the primary time column <code>__time</code>, make sure it is being correctly translated to an
+<code>&quot;intervals&quot;</code> filter, as described in the <a href="#time-filters">Time filters</a> section below. If not, you may need to change
+the way you write the filter.</p></li>
+<li><p>Try to avoid subqueries underneath joins: they affect both performance and scalability. This includes implicit
+subqueries generated by conditions on mismatched types, and implicit subqueries generated by conditions that use
+expressions to refer to the right-hand side.</p></li>
+<li><p>Currently, Druid does not support pushing down predicates (condition and filter) past a Join (i.e. into
+Join's children). Druid only supports pushing predicates into the join if they originated from
+above the join. Hence, the location of predicates and filters in your Druid SQL is very important.
+Also, as a result of this, comma joins should be avoided.</p></li>
+<li><p>Read through the <a href="/docs/0.20.0/querying/query-execution.html">Query execution</a> page to understand how various types of native queries
+will be executed.</p></li>
+<li><p>Be careful when interpreting EXPLAIN PLAN output, and use request logging if in doubt. Request logs will show the
+exact native query that was run. See the <a href="#interpreting-explain-plan-output">next section</a> for more details.</p></li>
+<li><p>If you encounter a query that could be planned better, feel free to
+<a href="https://github.com/apache/druid/issues/new/choose">raise an issue on GitHub</a>. A reproducible test case is always
+appreciated.</p></li>
+</ol>
+<h3><a class="anchor" aria-hidden="true" id="interpreting-explain-plan-output"></a><a href="#interpreting-explain-plan-output" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Interpreting EXPLAIN PLAN output</h3>
+<p>The <a href="#explain-plan">EXPLAIN PLAN</a> functionality can help you understand how a given SQL query will
+be translated to native. For simple queries that do not involve subqueries or joins, the output of EXPLAIN PLAN
+is easy to interpret. The native query that will run is embedded as JSON inside a &quot;DruidQueryRel&quot; line:</p>
+<pre><code class="hljs">&gt; EXPLAIN PLAN FOR SELECT COUNT(<span class="hljs-name">*</span>) FROM wikipedia
+
+DruidQueryRel(<span class="hljs-name">query=</span>[{<span class="hljs-string">"queryType"</span>:<span class="hljs-string">"timeseries"</span>,<span class="hljs-string">"dataSource"</span>:<span class="hljs-string">"wikipedia"</span>,<span class="hljs-string">"intervals"</span>:<span class="hljs-string">"-146136543-09-08T08:23:32.096Z/146140482-04-24T15:36:27.903Z"</span>,<span class="hljs-string">"granularity"</span>:<span class="hljs-string">"all"</span>,<span class="hljs-string">"aggregations"</span>:[{<span class="hljs-string">"type"</span>:<span class="hljs-string">"count"</span>,<span class="hljs-string">"name"</span>:<span class="hljs-string">"a0"</span>}]}], signature=[{a0<span class="hljs-symbol">:LONG</span>}])
+</code></pre>
+<p>For more complex queries that do involve subqueries or joins, EXPLAIN PLAN is somewhat more difficult to interpret.
+For example, consider this query:</p>
+<pre><code class="hljs">&gt; EXPLAIN PLAN <span class="hljs-keyword">FOR</span>
+&gt; SELECT
+&gt;     channel,
+&gt;     COUNT(*)
+&gt; <span class="hljs-keyword">FROM</span> wikipedia
+&gt; WHERE channel <span class="hljs-keyword">IN</span> (SELECT<span class="hljs-built_in"> page </span><span class="hljs-keyword">FROM</span> wikipedia<span class="hljs-built_in"> GROUP </span>BY<span class="hljs-built_in"> page </span>ORDER BY COUNT(*) DESC LIMIT 10)
+&gt;<span class="hljs-built_in"> GROUP </span>BY channel
+
+DruidJoinQueryRel(condition=[=(<span class="hljs-variable">$1</span>, <span class="hljs-variable">$3</span>)], joinType=[inner], query=[{<span class="hljs-string">"queryType"</span>:<span class="hljs-string">"groupBy"</span>,<span class="hljs-string">"dataSource"</span>:{<span class="hljs-string">"type"</span>:<span class="hljs-string">"table"</span>,<span class="hljs-string">"name"</span>:<span class="hljs-string">"__join__"</span>},<span class="hljs-string">"intervals"</span>:{<span class="hljs-string">"type"</span>:<span class="hljs-string">"intervals"</span>,<span class="hljs-string">"intervals"</span>:[<span class="hljs-string">"-146136543-09-08T08:23:32.096Z/146140482-04-24T15:36:27.903Z"</span>]},<span class="hljs-string">"granularity"</span>:<span class="hljs-string">"all"</span>,<span class="hljs-string">"dimensions"</span>:[<span class="hljs-string">"channel"</span>],<span class="hljs-string">"aggregations"</span>:[{<span class="hljs-string">"type"</span>:<span class="hljs-string">"count"</span>,<span class="hljs-string">"name"</span>:<span class="hljs-string">"a0"</span>}]}], signature=[{d0:STRING, a0:LONG}])
+  DruidQueryRel(query=[{<span class="hljs-string">"queryType"</span>:<span class="hljs-string">"scan"</span>,<span class="hljs-string">"dataSource"</span>:{<span class="hljs-string">"type"</span>:<span class="hljs-string">"table"</span>,<span class="hljs-string">"name"</span>:<span class="hljs-string">"wikipedia"</span>},<span class="hljs-string">"intervals"</span>:{<span class="hljs-string">"type"</span>:<span class="hljs-string">"intervals"</span>,<span class="hljs-string">"intervals"</span>:[<span class="hljs-string">"-146136543-09-08T08:23:32.096Z/146140482-04-24T15:36:27.903Z"</span>]},<span class="hljs-string">"resultFormat"</span>:<span class="hljs-string">"compactedList"</span>,<span class="hljs-string">"columns"</span>:[<span class="hljs-string">"__time"</span>,<span class="hljs-string">"channel"</span>,<span class="hljs-string">"page"</span>],<span class="hljs-string">"granularity"</span>:<span class="hljs-string">"all"</span>}], signature=[{__time:LONG, channel:STRING, page:STRING}])
+  DruidQueryRel(query=[{<span class="hljs-string">"queryType"</span>:<span class="hljs-string">"topN"</span>,<span class="hljs-string">"dataSource"</span>:{<span class="hljs-string">"type"</span>:<span class="hljs-string">"table"</span>,<span class="hljs-string">"name"</span>:<span class="hljs-string">"wikipedia"</span>},<span class="hljs-string">"dimension"</span>:<span class="hljs-string">"page"</span>,<span class="hljs-string">"metric"</span>:{<span class="hljs-string">"type"</span>:<span class="hljs-string">"numeric"</span>,<span class="hljs-string">"metric"</span>:<span class="hljs-string">"a0"</span>},<span class="hljs-string">"threshold"</span>:10,<span class="hljs-string">"intervals"</span>:{<span class="hljs-string">"type"</span>:<span class="hljs-string">"intervals"</span>,<span class="hljs-string">"intervals"</span>:[<span class="hljs-string">"-146136543-09-08T08:23:32.096Z/146140482-04-24T15:36:27.903Z"</span>]},<span class="hljs-string">"granularity"</span>:<span class="hljs-string">"all"</span>,<span class="hljs-string">"aggregations"</span>:[{<span class="hljs-string">"type"</span>:<span class="hljs-string">"count"</span>,<span class="hljs-string">"name"</span>:<span class="hljs-string">"a0"</span>}]}], signature=[{d0:STRING}])
+</code></pre>
+<p>Here, there is a join with two inputs. The way to read this is to consider each line of the EXPLAIN PLAN output as
+something that might become a query, or might just become a simple datasource. The <code>query</code> field they all have is
+called a &quot;partial query&quot; and represents what query would be run on the datasource represented by that line, if that
+line ran by itself. In some cases — like the &quot;scan&quot; query in the second line of this example — the query does not
+actually run, and it ends up being translated to a simple table datasource. See the <a href="#joins">Join translation</a> section
+for more details about how this works.</p>
+<p>We can see this for ourselves using Druid's <a href="/docs/0.20.0/configuration/index.html#request-logging">request logging</a> feature. After
+enabling logging and running this query, we can see that it actually runs as the following native query.</p>
+<pre><code class="hljs css language-json">{
+  <span class="hljs-attr">"queryType"</span>: <span class="hljs-string">"groupBy"</span>,
+  <span class="hljs-attr">"dataSource"</span>: {
+    <span class="hljs-attr">"type"</span>: <span class="hljs-string">"join"</span>,
+    <span class="hljs-attr">"left"</span>: <span class="hljs-string">"wikipedia"</span>,
+    <span class="hljs-attr">"right"</span>: {
+      <span class="hljs-attr">"type"</span>: <span class="hljs-string">"query"</span>,
+      <span class="hljs-attr">"query"</span>: {
+        <span class="hljs-attr">"queryType"</span>: <span class="hljs-string">"topN"</span>,
+        <span class="hljs-attr">"dataSource"</span>: <span class="hljs-string">"wikipedia"</span>,
+        <span class="hljs-attr">"dimension"</span>: {<span class="hljs-attr">"type"</span>: <span class="hljs-string">"default"</span>, <span class="hljs-attr">"dimension"</span>: <span class="hljs-string">"page"</span>, <span class="hljs-attr">"outputName"</span>: <span class="hljs-string">"d0"</span>},
+        <span class="hljs-attr">"metric"</span>: {<span class="hljs-attr">"type"</span>: <span class="hljs-string">"numeric"</span>, <span class="hljs-attr">"metric"</span>: <span class="hljs-string">"a0"</span>},
+        <span class="hljs-attr">"threshold"</span>: <span class="hljs-number">10</span>,
+        <span class="hljs-attr">"intervals"</span>: <span class="hljs-string">"-146136543-09-08T08:23:32.096Z/146140482-04-24T15:36:27.903Z"</span>,
+        <span class="hljs-attr">"granularity"</span>: <span class="hljs-string">"all"</span>,
+        <span class="hljs-attr">"aggregations"</span>: [
+          { <span class="hljs-attr">"type"</span>: <span class="hljs-string">"count"</span>, <span class="hljs-attr">"name"</span>: <span class="hljs-string">"a0"</span>}
+        ]
+      }
+    },
+    <span class="hljs-attr">"rightPrefix"</span>: <span class="hljs-string">"j0."</span>,
+    <span class="hljs-attr">"condition"</span>: <span class="hljs-string">"(\"page\" == \"j0.d0\")"</span>,
+    <span class="hljs-attr">"joinType"</span>: <span class="hljs-string">"INNER"</span>
+  },
+  <span class="hljs-attr">"intervals"</span>: <span class="hljs-string">"-146136543-09-08T08:23:32.096Z/146140482-04-24T15:36:27.903Z"</span>,
+  <span class="hljs-attr">"granularity"</span>: <span class="hljs-string">"all"</span>,
+  <span class="hljs-attr">"dimensions"</span>: [
+    {<span class="hljs-attr">"type"</span>: <span class="hljs-string">"default"</span>, <span class="hljs-attr">"dimension"</span>: <span class="hljs-string">"channel"</span>, <span class="hljs-attr">"outputName"</span>: <span class="hljs-string">"d0"</span>}
+  ],
+  <span class="hljs-attr">"aggregations"</span>: [
+    { <span class="hljs-attr">"type"</span>: <span class="hljs-string">"count"</span>, <span class="hljs-attr">"name"</span>: <span class="hljs-string">"a0"</span>}
+  ]
+}
+</code></pre>
+<h3><a class="anchor" aria-hidden="true" id="query-types"></a><a href="#query-types" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Query types</h3>
+<p>Druid SQL uses four different native query types.</p>
+<ul>
+<li><p><a href="scan-query.html">Scan</a> is used for queries that do not aggregate (no GROUP BY, no DISTINCT).</p></li>
+<li><p><a href="timeseriesquery.html">Timeseries</a> is used for queries that GROUP BY <code>FLOOR(__time TO &lt;unit&gt;)</code> or <code>TIME_FLOOR(__time, period)</code>, have no other grouping expressions, no HAVING or LIMIT clauses, no nesting, and either no ORDER BY, or an
+ORDER BY that orders by same expression as present in GROUP BY. It also uses Timeseries for &quot;grand total&quot; queries that
+have aggregation functions but no GROUP BY. This query type takes advantage of the fact that Druid segments are sorted
+by time.</p></li>
+<li><p><a href="topnquery.html">TopN</a> is used by default for queries that group by a single expression, do have ORDER BY and LIMIT
+clauses, do not have HAVING clauses, and are not nested. However, the TopN query type will deliver approximate ranking
+and results in some cases; if you want to avoid this, set &quot;useApproximateTopN&quot; to &quot;false&quot;. TopN results are always
+computed in memory. See the TopN documentation for more details.</p></li>
+<li><p><a href="groupbyquery.html">GroupBy</a> is used for all other aggregations, including any nested aggregation queries. Druid's
+GroupBy is a traditional aggregation engine: it delivers exact results and rankings and supports a wide variety of
+features. GroupBy aggregates in memory if it can, but it may spill to disk if it doesn't have enough memory to complete
+your query. Results are streamed back from data processes through the Broker if you ORDER BY the same expressions in your
+GROUP BY clause, or if you don't have an ORDER BY at all. If your query has an ORDER BY referencing expressions that
+don't appear in the GROUP BY clause (like aggregation functions) then the Broker will materialize a list of results in
+memory, up to a max of your LIMIT, if any. See the GroupBy documentation for details about tuning performance and memory
+use.</p></li>
+</ul>
+<h3><a class="anchor" aria-hidden="true" id="time-filters"></a><a href="#time-filters" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Time filters</h3>
+<p>For all native query types, filters on the <code>__time</code> column will be translated into top-level query &quot;intervals&quot; whenever
+possible, which allows Druid to use its global time index to quickly prune the set of data that must be scanned.
+Consider this (non-exhaustive) list of time filters that will be recognized and translated to &quot;intervals&quot;:</p>
+<ul>
+<li><code>__time &gt;= TIMESTAMP '2000-01-01 00:00:00'</code> (comparison to absolute time)</li>
+<li><code>__time &gt;= CURRENT_TIMESTAMP - INTERVAL '8' HOUR</code> (comparison to relative time)</li>
+<li><code>FLOOR(__time TO DAY) = TIMESTAMP '2000-01-01 00:00:00'</code> (specific day)</li>
+</ul>
+<p>Refer to the <a href="#interpreting-explain-plan-output">Interpreting EXPLAIN PLAN output</a> section for details on confirming
+that time filters are being translated as you expect.</p>
+<h3><a class="anchor" aria-hidden="true" id="joins"></a><a href="#joins" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Joins</h3>
+<p>SQL join operators are translated to native join datasources as follows:</p>
+<ol>
+<li><p>Joins that the native layer can handle directly are translated literally, to a <a href="/docs/0.20.0/querying/datasource.html#join">join datasource</a>
+whose <code>left</code>, <code>right</code>, and <code>condition</code> are faithful translations of the original SQL. This includes any SQL join where
+the right-hand side is a lookup or subquery, and where the condition is an equality where one side is an expression based
+on the left-hand table, the other side is a simple column reference to the right-hand table, and both sides of the
+equality are the same data type.</p></li>
+<li><p>If a join cannot be handled directly by a native <a href="/docs/0.20.0/querying/datasource.html#join">join datasource</a> as written, Druid SQL
+will insert subqueries to make it runnable. For example, <code>foo INNER JOIN bar ON foo.abc = LOWER(bar.def)</code> cannot be
+directly translated, because there is an expression on the right-hand side instead of a simple column access. A subquery
+will be inserted that effectively transforms this clause to
+<code>foo INNER JOIN (SELECT LOWER(def) AS def FROM bar) t ON foo.abc = t.def</code>.</p></li>
+<li><p>Druid SQL does not currently reorder joins to optimize queries.</p></li>
+</ol>
+<p>Refer to the <a href="#interpreting-explain-plan-output">Interpreting EXPLAIN PLAN output</a> section for details on confirming
+that joins are being translated as you expect.</p>
+<p>Refer to the <a href="/docs/0.20.0/querying/query-execution.html#join">Query execution</a> page for information about how joins are executed.</p>
+<h3><a class="anchor" aria-hidden="true" id="subqueries"></a><a href="#subqueries" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Subqueries</h3>
+<p>Subqueries in SQL are generally translated to native query datasources. Refer to the
+<a href="/docs/0.20.0/querying/query-execution.html#query">Query execution</a> page for information about how subqueries are executed.</p>
+<blockquote>
+<p>Note: Subqueries in the WHERE clause, like <code>WHERE col1 IN (SELECT foo FROM ...)</code> are translated to inner joins.</p>
+</blockquote>
+<h3><a class="anchor" aria-hidden="true" id="approximations"></a><a href="#approximations" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Approximations</h3>
+<p>Druid SQL will use approximate algorithms in some situations:</p>
+<ul>
+<li><p>The <code>COUNT(DISTINCT col)</code> aggregation functions by default uses a variant of
+<a href="http://algo.inria.fr/flajolet/Publications/FlFuGaMe07.pdf">HyperLogLog</a>, a fast approximate distinct counting
+algorithm. Druid SQL will switch to exact distinct counts if you set &quot;useApproximateCountDistinct&quot; to &quot;false&quot;, either
+through query context or through Broker configuration.</p></li>
+<li><p>GROUP BY queries over a single column with ORDER BY and LIMIT may be executed using the TopN engine, which uses an
+approximate algorithm. Druid SQL will switch to an exact grouping algorithm if you set &quot;useApproximateTopN&quot; to &quot;false&quot;,
+either through query context or through Broker configuration.</p></li>
+<li><p>Aggregation functions that are labeled as using sketches or approximations, such as APPROX_COUNT_DISTINCT, are always
+approximate, regardless of configuration.</p></li>
+</ul>
+<h3><a class="anchor" aria-hidden="true" id="unsupported-features"></a><a href="#unsupported-features" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Unsupported features</h3>
+<p>Druid does not support all SQL features. In particular, the following features are not supported.</p>
+<ul>
+<li>JOIN between native datasources (table, lookup, subquery) and <a href="#metadata-tables">system tables</a>.</li>
+<li>JOIN conditions that are not an equality between expressions from the left- and right-hand sides.</li>
+<li>JOIN conditions containing a constant value inside the condition.</li>
+<li>JOIN conditions on a column which contains a multi-value dimension.</li>
+<li>OVER clauses, and analytic functions such as <code>LAG</code> and <code>LEAD</code>.</li>
+<li>ORDER BY for a non-aggregating query, except for <code>ORDER BY __time</code> or <code>ORDER BY __time DESC</code>, which are supported.
+This restriction only applies to non-aggregating queries; you can ORDER BY any column in an aggregating query.</li>
+<li>DDL and DML.</li>
+<li>Using Druid-specific functions like <code>TIME_PARSE</code> and <code>APPROX_QUANTILE_DS</code> on <a href="#metadata-tables">system tables</a>.</li>
+</ul>
+<p>Additionally, some Druid native query features are not supported by the SQL language. Some unsupported Druid features
+include:</p>
+<ul>
+<li><a href="datasource.html#inline">Inline datasources</a>.</li>
+<li><a href="../development/geo.html">Spatial filters</a>.</li>
+<li><a href="querying.html#query-cancellation">Query cancellation</a>.</li>
+<li><a href="#multi-value-strings">Multi-value dimensions</a> are only partially implemented in Druid SQL. There are known
+inconsistencies between their behavior in SQL queries and in native queries due to how they are currently treated by
+the SQL planner.</li>
+</ul>
+<h2><a class="anchor" aria-hidden="true" id="client-apis"></a><a href="#client-apis" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Client APIs</h2>
+<p><a name="json-over-http"></a></p>
+<h3><a class="anchor" aria-hidden="true" id="http-post"></a><a href="#http-post" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>HTTP POST</h3>
+<p>You can make Druid SQL queries using HTTP via POST to the endpoint <code>/druid/v2/sql/</code>. The request should
+be a JSON object with a &quot;query&quot; field, like <code>{&quot;query&quot; : &quot;SELECT COUNT(*) FROM data_source WHERE foo = 'bar'&quot;}</code>.</p>
+<h5><a class="anchor" aria-hidden="true" id="request"></a><a href="#request" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Request</h5>
+<table>
+<thead>
+<tr><th>Property</th><th>Description</th><th>Default</th></tr>
+</thead>
+<tbody>
+<tr><td><code>query</code></td><td>SQL query string.</td><td>none (required)</td></tr>
+<tr><td><code>resultFormat</code></td><td>Format of query results. See <a href="#responses">Responses</a> for details.</td><td><code>&quot;object&quot;</code></td></tr>
+<tr><td><code>header</code></td><td>Whether or not to include a header. See [Responses] for details.</td><td><code>false</code></td></tr>
+<tr><td><code>context</code></td><td>JSON object containing <a href="#connection-context">connection context parameters</a>.</td><td><code>{}</code> (empty)</td></tr>
+<tr><td><code>parameters</code></td><td>List of query parameters for parameterized queries. Each parameter in the list should be a JSON object like <code>{&quot;type&quot;: &quot;VARCHAR&quot;, &quot;value&quot;: &quot;foo&quot;}</code>. The type should be a SQL type; see <a href="#data-types">Data types</a> for a list of supported SQL types.</td><td><code>[]</code> (empty)</td></tr>
+</tbody>
+</table>
+<p>You can use <em>curl</em> to send SQL queries from the command-line:</p>
+<pre><code class="hljs css language-bash">$ cat query.json
+{<span class="hljs-string">"query"</span>:<span class="hljs-string">"SELECT COUNT(*) AS TheCount FROM data_source"</span>}
+
+$ curl -XPOST -H<span class="hljs-string">'Content-Type: application/json'</span> http://BROKER:8082/druid/v2/sql/ -d @query.json
+[{<span class="hljs-string">"TheCount"</span>:24433}]
+</code></pre>
+<p>There are a variety of <a href="#connection-context">connection context parameters</a> you can provide by adding a &quot;context&quot; map,
+like:</p>
+<pre><code class="hljs css language-json">{
+  <span class="hljs-attr">"query"</span> : <span class="hljs-string">"SELECT COUNT(*) FROM data_source WHERE foo = 'bar' AND __time &gt; TIMESTAMP '2000-01-01 00:00:00'"</span>,
+  <span class="hljs-attr">"context"</span> : {
+    <span class="hljs-attr">"sqlTimeZone"</span> : <span class="hljs-string">"America/Los_Angeles"</span>
+  }
+}
+</code></pre>
+<p>Parameterized SQL queries are also supported:</p>
+<pre><code class="hljs css language-json">{
+  <span class="hljs-attr">"query"</span> : <span class="hljs-string">"SELECT COUNT(*) FROM data_source WHERE foo = ? AND __time &gt; ?"</span>,
+  <span class="hljs-attr">"parameters"</span>: [
+    { <span class="hljs-attr">"type"</span>: <span class="hljs-string">"VARCHAR"</span>, <span class="hljs-attr">"value"</span>: <span class="hljs-string">"bar"</span>},
+    { <span class="hljs-attr">"type"</span>: <span class="hljs-string">"TIMESTAMP"</span>, <span class="hljs-attr">"value"</span>: <span class="hljs-string">"2000-01-01 00:00:00"</span> }
+  ]
+}
+</code></pre>
+<p>Metadata is available over HTTP POST by querying <a href="#metadata-tables">metadata tables</a>.</p>
+<h4><a class="anchor" aria-hidden="true" id="responses"></a><a href="#responses" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Responses</h4>
+<p>Druid SQL's HTTP POST API supports a variety of result formats. You can specify these by adding a &quot;resultFormat&quot;
+parameter, like:</p>
+<pre><code class="hljs css language-json">{
+  <span class="hljs-attr">"query"</span> : <span class="hljs-string">"SELECT COUNT(*) FROM data_source WHERE foo = 'bar' AND __time &gt; TIMESTAMP '2000-01-01 00:00:00'"</span>,
+  <span class="hljs-attr">"resultFormat"</span> : <span class="hljs-string">"object"</span>
+}
+</code></pre>
+<p>The supported result formats are:</p>
+<table>
+<thead>
+<tr><th>Format</th><th>Description</th><th>Content-Type</th></tr>
+</thead>
+<tbody>
+<tr><td><code>object</code></td><td>The default, a JSON array of JSON objects. Each object's field names match the columns returned by the SQL query, and are provided in the same order as the SQL query.</td><td>application/json</td></tr>
+<tr><td><code>array</code></td><td>JSON array of JSON arrays. Each inner array has elements matching the columns returned by the SQL query, in order.</td><td>application/json</td></tr>
+<tr><td><code>objectLines</code></td><td>Like &quot;object&quot;, but the JSON objects are separated by newlines instead of being wrapped in a JSON array. This can make it easier to parse the entire response set as a stream, if you do not have ready access to a streaming JSON parser. To make it possible to detect a truncated response, this format includes a trailer of one blank line.</td><td>text/plain</td></tr>
+<tr><td><code>arrayLines</code></td><td>Like &quot;array&quot;, but the JSON arrays are separated by newlines instead of being wrapped in a JSON array. This can make it easier to parse the entire response set as a stream, if you do not have ready access to a streaming JSON parser. To make it possible to detect a truncated response, this format includes a trailer of one blank line.</td><td>text/plain</td></tr>
+<tr><td><code>csv</code></td><td>Comma-separated values, with one row per line. Individual field values may be escaped by being surrounded in double quotes. If double quotes appear in a field value, they will be escaped by replacing them with double-double-quotes like <code>&quot;&quot;this&quot;&quot;</code>. To make it possible to detect a truncated response, this format includes a trailer of one blank line.</td><td>text/csv</td></tr>
+</tbody>
+</table>
+<p>You can additionally request a header by setting &quot;header&quot; to true in your request, like:</p>
+<pre><code class="hljs css language-json">{
+  <span class="hljs-attr">"query"</span> : <span class="hljs-string">"SELECT COUNT(*) FROM data_source WHERE foo = 'bar' AND __time &gt; TIMESTAMP '2000-01-01 00:00:00'"</span>,
+  <span class="hljs-attr">"resultFormat"</span> : <span class="hljs-string">"arrayLines"</span>,
+  <span class="hljs-attr">"header"</span> : <span class="hljs-literal">true</span>
+}
+</code></pre>
+<p>In this case, the first result returned will be a header. For the <code>csv</code>, <code>array</code>, and <code>arrayLines</code> formats, the header
+will be a list of column names. For the <code>object</code> and <code>objectLines</code> formats, the header will be an object where the
+keys are column names, and the values are null.</p>
+<p>Errors that occur before the response body is sent will be reported in JSON, with an HTTP 500 status code, in the
+same format as <a href="../querying/querying.html#query-errors">native Druid query errors</a>. If an error occurs while the response body is
+being sent, at that point it is too late to change the HTTP status code or report a JSON error, so the response will
+simply end midstream and an error will be logged by the Druid server that was handling your request.</p>
+<p>As a caller, it is important that you properly handle response truncation. This is easy for the &quot;object&quot; and &quot;array&quot;
+formats, since truncated responses will be invalid JSON. For the line-oriented formats, you should check the
+trailer they all include: one blank line at the end of the result set. If you detect a truncated response, either
+through a JSON parsing error or through a missing trailing newline, you should assume the response was not fully
+delivered due to an error.</p>
+<h3><a class="anchor" aria-hidden="true" id="jdbc"></a><a href="#jdbc" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>JDBC</h3>
+<p>You can make Druid SQL queries using the <a href="https://calcite.apache.org/avatica/downloads/">Avatica JDBC driver</a>. We recommend using Avatica JDBC driver version 1.17.0 or later. Note that as of the time of this writing, Avatica 1.17.0, the latest version, does not support passing connection string parameters from the URL to Druid, so you must pass them using a <code>Properties</code> object. Once you've downloaded the Avatica client jar, add it to your classpath and use the connect string <code>jdbc:avatica:remote:url=http://BROKER:8082/druid/v2/sql/avatica/</code>.</p>
+<p>Example code:</p>
+<pre><code class="hljs css language-java"><span class="hljs-comment">// Connect to /druid/v2/sql/avatica/ on your Broker.</span>
+String url = <span class="hljs-string">"jdbc:avatica:remote:url=http://localhost:8082/druid/v2/sql/avatica/"</span>;
+
+<span class="hljs-comment">// Set any connection context parameters you need here (see "Connection context" below).</span>
+<span class="hljs-comment">// Or leave empty for default behavior.</span>
+Properties connectionProperties = <span class="hljs-keyword">new</span> Properties();
+
+<span class="hljs-keyword">try</span> (Connection connection = DriverManager.getConnection(url, connectionProperties)) {
+  <span class="hljs-keyword">try</span> (
+      <span class="hljs-keyword">final</span> Statement statement = connection.createStatement();
+      <span class="hljs-keyword">final</span> ResultSet resultSet = statement.executeQuery(query)
+  ) {
+    <span class="hljs-keyword">while</span> (resultSet.next()) {
+      <span class="hljs-comment">// process result set</span>
+    }
+  }
+}
+</code></pre>
+<p>Table metadata is available over JDBC using <code>connection.getMetaData()</code> or by querying the
+<a href="#metadata-tables">&quot;INFORMATION_SCHEMA&quot; tables</a>.</p>
+<h4><a class="anchor" aria-hidden="true" id="connection-stickiness"></a><a href="#connection-stickiness" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Connection stickiness</h4>
+<p>Druid's JDBC server does not share connection state between Brokers. This means that if you're using JDBC and have
+multiple Druid Brokers, you should either connect to a specific Broker, or use a load balancer with sticky sessions
+enabled. The Druid Router process provides connection stickiness when balancing JDBC requests, and can be used to achieve
+the necessary stickiness even with a normal non-sticky load balancer. Please see the
+<a href="/docs/0.20.0/design/router.html">Router</a> documentation for more details.</p>
+<p>Note that the non-JDBC <a href="#http-post">JSON over HTTP</a> API is stateless and does not require stickiness.</p>
+<h3><a class="anchor" aria-hidden="true" id="dynamic-parameters-1"></a><a href="#dynamic-parameters-1" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Dynamic Parameters</h3>
+<p>You can also use parameterized queries in JDBC code, as in this example;</p>
+<pre><code class="hljs css language-java">PreparedStatement statement = connection.prepareStatement(<span class="hljs-string">"SELECT COUNT(*) AS cnt FROM druid.foo WHERE dim1 = ? OR dim1 = ?"</span>);
+statement.setString(<span class="hljs-number">1</span>, <span class="hljs-string">"abc"</span>);
+statement.setString(<span class="hljs-number">2</span>, <span class="hljs-string">"def"</span>);
+<span class="hljs-keyword">final</span> ResultSet resultSet = statement.executeQuery();
+</code></pre>
+<h3><a class="anchor" aria-hidden="true" id="connection-context"></a><a href="#connection-context" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Connection context</h3>
+<p>Druid SQL supports setting connection parameters on the client. The parameters in the table below affect SQL planning.
+All other context parameters you provide will be attached to Druid queries and can affect how they run. See
+<a href="query-context.html">Query context</a> for details on the possible options.</p>
+<pre><code class="hljs css language-java">String url = <span class="hljs-string">"jdbc:avatica:remote:url=http://localhost:8082/druid/v2/sql/avatica/"</span>;
+
+<span class="hljs-comment">// Set any query context parameters you need here.</span>
+Properties connectionProperties = <span class="hljs-keyword">new</span> Properties();
+connectionProperties.setProperty(<span class="hljs-string">"sqlTimeZone"</span>, <span class="hljs-string">"America/Los_Angeles"</span>);
+connectionProperties.setProperty(<span class="hljs-string">"useCache"</span>, <span class="hljs-string">"false"</span>);
+
+<span class="hljs-keyword">try</span> (Connection connection = DriverManager.getConnection(url, connectionProperties)) {
+  <span class="hljs-comment">// create and execute statements, process result sets, etc</span>
+}
+</code></pre>
+<p>Note that to specify an unique identifier for SQL query, use <code>sqlQueryId</code> instead of <code>queryId</code>. Setting <code>queryId</code> for a SQL
+request has no effect, all native queries underlying SQL will use auto-generated queryId.</p>
+<p>Connection context can be specified as JDBC connection properties or as a &quot;context&quot; object in the JSON API.</p>
+<table>
+<thead>
+<tr><th>Parameter</th><th>Description</th><th>Default value</th></tr>
+</thead>
+<tbody>
+<tr><td><code>sqlQueryId</code></td><td>Unique identifier given to this SQL query. For HTTP client, it will be returned in <code>X-Druid-SQL-Query-Id</code> header.</td><td>auto-generated</td></tr>
+<tr><td><code>sqlTimeZone</code></td><td>Sets the time zone for this connection, which will affect how time functions and timestamp literals behave. Should be a time zone name like &quot;America/Los_Angeles&quot; or offset like &quot;-08:00&quot;.</td><td>druid.sql.planner.sqlTimeZone on the Broker (default: UTC)</td></tr>
+<tr><td><code>useApproximateCountDistinct</code></td><td>Whether to use an approximate cardinality algorithm for <code>COUNT(DISTINCT foo)</code>.</td><td>druid.sql.planner.useApproximateCountDistinct on the Broker (default: true)</td></tr>
+<tr><td><code>useApproximateTopN</code></td><td>Whether to use approximate <a href="topnquery.html">TopN queries</a> when a SQL query could be expressed as such. If false, exact <a href="groupbyquery.html">GroupBy queries</a> will be used instead.</td><td>druid.sql.planner.useApproximateTopN on the Broker (default: true)</td></tr>
+</tbody>
+</table>
+<h2><a class="anchor" aria-hidden="true" id="metadata-tables"></a><a href="#metadata-tables" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Metadata tables</h2>
+<p>Druid Brokers infer table and column metadata for each datasource from segments loaded in the cluster, and use this to
+plan SQL queries. This metadata is cached on Broker startup and also updated periodically in the background through
+<a href="segmentmetadataquery.html">SegmentMetadata queries</a>. Background metadata refreshing is triggered by
+segments entering and exiting the cluster, and can also be throttled through configuration.</p>
+<p>Druid exposes system information through special system tables. There are two such schemas available: Information Schema and Sys Schema.
+Information schema provides details about table and column types. The &quot;sys&quot; schema provides information about Druid internals like segments/tasks/servers.</p>
+<h3><a class="anchor" aria-hidden="true" id="information-schema"></a><a href="#information-schema" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>INFORMATION SCHEMA</h3>
+<p>You can access table and column metadata through JDBC using <code>connection.getMetaData()</code>, or through the
+INFORMATION_SCHEMA tables described below. For example, to retrieve metadata for the Druid
+datasource &quot;foo&quot;, use the query:</p>
+<pre><code class="hljs css language-sql"><span class="hljs-keyword">SELECT</span> * <span class="hljs-keyword">FROM</span> INFORMATION_SCHEMA.COLUMNS <span class="hljs-keyword">WHERE</span> TABLE_SCHEMA = <span class="hljs-string">'druid'</span> <span class="hljs-keyword">AND</span> TABLE_NAME = <span class="hljs-string">'foo'</span>
+</code></pre>
+<blockquote>
+<p>Note: INFORMATION_SCHEMA tables do not currently support Druid-specific functions like <code>TIME_PARSE</code> and
+<code>APPROX_QUANTILE_DS</code>. Only standard SQL functions can be used.</p>
+</blockquote>
+<h4><a class="anchor" aria-hidden="true" id="schemata-table"></a><a href="#schemata-table" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>SCHEMATA table</h4>
+<p><code>INFORMATION_SCHEMA.SCHEMATA</code> provides a list of all known schemas, which include <code>druid</code> for standard <a href="/docs/0.20.0/querying/datasource.html#table">Druid Table datasources</a>, <code>lookup</code> for <a href="/docs/0.20.0/querying/datasource.html#lookup">Lookups</a>, <code>sys</code> for the virtual <a href="#system-schema">System metadata tables</a>, and <code>INFORMATION_SCHEMA</code> for these virtual tables. Tables are allowed to have the same name across different schemas, so the schema may be included in an SQL statement to distinguish them, e.g. <code>lookup.table</code> vs <code>druid.table</code>.</p>
+<table>
+<thead>
+<tr><th>Column</th><th>Notes</th></tr>
+</thead>
+<tbody>
+<tr><td>CATALOG_NAME</td><td>Always set as <code>druid</code></td></tr>
+<tr><td>SCHEMA_NAME</td><td><code>druid</code>, <code>lookup</code>, <code>sys</code>, or <code>INFORMATION_SCHEMA</code></td></tr>
+<tr><td>SCHEMA_OWNER</td><td>Unused</td></tr>
+<tr><td>DEFAULT_CHARACTER_SET_CATALOG</td><td>Unused</td></tr>
+<tr><td>DEFAULT_CHARACTER_SET_SCHEMA</td><td>Unused</td></tr>
+<tr><td>DEFAULT_CHARACTER_SET_NAME</td><td>Unused</td></tr>
+<tr><td>SQL_PATH</td><td>Unused</td></tr>
+</tbody>
+</table>
+<h4><a class="anchor" aria-hidden="true" id="tables-table"></a><a href="#tables-table" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>TABLES table</h4>
+<p><code>INFORMATION_SCHEMA.TABLES</code> provides a list of all known tables and schemas.</p>
+<table>
+<thead>
+<tr><th>Column</th><th>Notes</th></tr>
+</thead>
+<tbody>
+<tr><td>TABLE_CATALOG</td><td>Always set as <code>druid</code></td></tr>
+<tr><td>TABLE_SCHEMA</td><td>The 'schema' which the table falls under, see <a href="#schemata-table">SCHEMATA table for details</a></td></tr>
+<tr><td>TABLE_NAME</td><td>Table name. For the <code>druid</code> schema, this is the <code>dataSource</code>.</td></tr>
+<tr><td>TABLE_TYPE</td><td>&quot;TABLE&quot; or &quot;SYSTEM_TABLE&quot;</td></tr>
+<tr><td>IS_JOINABLE</td><td>If a table is directly joinable if on the right hand side of a <code>JOIN</code> statement, without performing a subquery, this value will be set to <code>YES</code>, otherwise <code>NO</code>. Lookups are always joinable because they are globally distributed among Druid query processing nodes, but Druid datasources are not, and will use a less efficient subquery join.</td></tr>
+<tr><td>IS_BROADCAST</td><td>If a table is 'broadcast' and distributed among all Druid query processing nodes, this value will be set to <code>YES</code>, such as lookups and Druid datasources which have a 'broadcast' load rule, else <code>NO</code>.</td></tr>
+</tbody>
+</table>
+<h4><a class="anchor" aria-hidden="true" id="columns-table"></a><a href="#columns-table" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>COLUMNS table</h4>
+<p><code>INFORMATION_SCHEMA.COLUMNS</code> provides a list of all known columns across all tables and schema.</p>
+<table>
+<thead>
+<tr><th>Column</th><th>Notes</th></tr>
+</thead>
+<tbody>
+<tr><td>TABLE_CATALOG</td><td>Always set as <code>druid</code></td></tr>
+<tr><td>TABLE_SCHEMA</td><td>The 'schema' which the table column falls under, see <a href="#schemata-table">SCHEMATA table for details</a></td></tr>
+<tr><td>TABLE_NAME</td><td>The 'table' which the column belongs to, see <a href="#tables-table">TABLES table for details</a></td></tr>
+<tr><td>COLUMN_NAME</td><td>The column name</td></tr>
+<tr><td>ORDINAL_POSITION</td><td>The order in which the column is stored in a table</td></tr>
+<tr><td>COLUMN_DEFAULT</td><td>Unused</td></tr>
+<tr><td>IS_NULLABLE</td><td></td></tr>
+<tr><td>DATA_TYPE</td><td></td></tr>
+<tr><td>CHARACTER_MAXIMUM_LENGTH</td><td>Unused</td></tr>
+<tr><td>CHARACTER_OCTET_LENGTH</td><td>Unused</td></tr>
+<tr><td>NUMERIC_PRECISION</td><td></td></tr>
+<tr><td>NUMERIC_PRECISION_RADIX</td><td></td></tr>
+<tr><td>NUMERIC_SCALE</td><td></td></tr>
+<tr><td>DATETIME_PRECISION</td><td></td></tr>
+<tr><td>CHARACTER_SET_NAME</td><td></td></tr>
+<tr><td>COLLATION_NAME</td><td></td></tr>
+<tr><td>JDBC_TYPE</td><td>Type code from java.sql.Types (Druid extension)</td></tr>
+</tbody>
+</table>
+<h3><a class="anchor" aria-hidden="true" id="system-schema"></a><a href="#system-schema" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>SYSTEM SCHEMA</h3>
+<p>The &quot;sys&quot; schema provides visibility into Druid segments, servers and tasks.</p>
+<blockquote>
+<p>Note: &quot;sys&quot; tables do not currently support Druid-specific functions like <code>TIME_PARSE</code> and
+<code>APPROX_QUANTILE_DS</code>. Only standard SQL functions can be used.</p>
+</blockquote>
+<h4><a class="anchor" aria-hidden="true" id="segments-table"></a><a href="#segments-table" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>SEGMENTS table</h4>
+<p>Segments table provides details on all Druid segments, whether they are published yet or not.</p>
+<table>
+<thead>
+<tr><th>Column</th><th>Type</th><th>Notes</th></tr>
+</thead>
+<tbody>
+<tr><td>segment_id</td><td>STRING</td><td>Unique segment identifier</td></tr>
+<tr><td>datasource</td><td>STRING</td><td>Name of datasource</td></tr>
+<tr><td>start</td><td>STRING</td><td>Interval start time (in ISO 8601 format)</td></tr>
+<tr><td>end</td><td>STRING</td><td>Interval end time (in ISO 8601 format)</td></tr>
+<tr><td>size</td><td>LONG</td><td>Size of segment in bytes</td></tr>
+<tr><td>version</td><td>STRING</td><td>Version string (generally an ISO8601 timestamp corresponding to when the segment set was first started). Higher version means the more recently created segment. Version comparing is based on string comparison.</td></tr>
+<tr><td>partition_num</td><td>LONG</td><td>Partition number (an integer, unique within a datasource+interval+version; may not necessarily be contiguous)</td></tr>
+<tr><td>num_replicas</td><td>LONG</td><td>Number of replicas of this segment currently being served</td></tr>
+<tr><td>num_rows</td><td>LONG</td><td>Number of rows in current segment, this value could be null if unknown to Broker at query time</td></tr>
+<tr><td>is_published</td><td>LONG</td><td>Boolean is represented as long type where 1 = true, 0 = false. 1 represents this segment has been published to the metadata store with <code>used=1</code>. See the <a href="/docs/0.20.0/design/architecture.html#segment-lifecycle">Architecture page</a> for more details.</td></tr>
+<tr><td>is_available</td><td>LONG</td><td>Boolean is represented as long type where 1 = true, 0 = false. 1 if this segment is currently being served by any process(Historical or realtime). See the <a href="/docs/0.20.0/design/architecture.html#segment-lifecycle">Architecture page</a> for more details.</td></tr>
+<tr><td>is_realtime</td><td>LONG</td><td>Boolean is represented as long type where 1 = true, 0 = false. 1 if this segment is <em>only</em> served by realtime tasks, and 0 if any historical process is serving this segment.</td></tr>
+<tr><td>is_overshadowed</td><td>LONG</td><td>Boolean is represented as long type where 1 = true, 0 = false. 1 if this segment is published and is <em>fully</em> overshadowed by some other published segments. Currently, is_overshadowed is always false for unpublished segments, although this may change in the future. You can filter for segments that &quot;should be published&quot; by filtering for <code>is_published = 1 AND is_overshadowed = 0</code>. Segments can briefly be both published and overshadowed if they were recently replaced, but have not been unpublished yet. See the <a href="/docs/0.20.0/design/architecture.html#segment-lifecycle">Architecture page</a> for more details.</td></tr>
+<tr><td>shardSpec</td><td>STRING</td><td>The toString of specific <code>ShardSpec</code></td></tr>
+<tr><td>dimensions</td><td>STRING</td><td>The dimensions of the segment</td></tr>
+<tr><td>metrics</td><td>STRING</td><td>The metrics of the segment</td></tr>
+<tr><td>last_compaction_state</td><td>STRING</td><td>The configurations of the compaction task which created this segment. May be null if segment was not created by compaction task.</td></tr>
+</tbody>
+</table>
+<p>For example to retrieve all segments for datasource &quot;wikipedia&quot;, use the query:</p>
+<pre><code class="hljs css language-sql"><span class="hljs-keyword">SELECT</span> * <span class="hljs-keyword">FROM</span> sys.segments <span class="hljs-keyword">WHERE</span> datasource = <span class="hljs-string">'wikipedia'</span>
+</code></pre>
+<p>Another example to retrieve segments total_size, avg_size, avg_num_rows and num_segments per datasource:</p>
+<pre><code class="hljs css language-sql"><span class="hljs-keyword">SELECT</span>
+    datasource,
+    <span class="hljs-keyword">SUM</span>(<span class="hljs-string">"size"</span>) <span class="hljs-keyword">AS</span> total_size,
+    <span class="hljs-keyword">CASE</span> <span class="hljs-keyword">WHEN</span> <span class="hljs-keyword">SUM</span>(<span class="hljs-string">"size"</span>) = <span class="hljs-number">0</span> <span class="hljs-keyword">THEN</span> <span class="hljs-number">0</span> <span class="hljs-keyword">ELSE</span> <span class="hljs-keyword">SUM</span>(<span class="hljs-string">"size"</span>) / (<span class="hljs-keyword">COUNT</span>(*) FILTER(<span class="hljs-keyword">WHERE</span> <span class="hljs-string">"size"</span> &gt; <span class="hljs-number">0</span>)) <span class="hljs-keyword">END</span> <span class="hljs-keyword">AS</span> avg_size,
+    <span class="hljs-keyword">CASE</span> <span class="hljs-keyword">WHEN</span> <span class="hljs-keyword">SUM</span>(num_rows) = <span class="hljs-number">0</span> <span class="hljs-keyword">THEN</span> <span class="hljs-number">0</span> <span class="hljs-keyword">ELSE</span> <span class="hljs-keyword">SUM</span>(<span class="hljs-string">"num_rows"</span>) / (<span class="hljs-keyword">COUNT</span>(*) FILTER(<span class="hljs-keyword">WHERE</span> num_rows &gt; <span class="hljs-number">0</span>)) <span class="hljs-keyword">END</span> <span class="hljs-keyword">AS</span> avg_num_rows,
+    <span class="hljs-keyword">COUNT</span>(*) <span class="hljs-keyword">AS</span> num_segments
+<span class="hljs-keyword">FROM</span> sys.segments
+<span class="hljs-keyword">GROUP</span> <span class="hljs-keyword">BY</span> <span class="hljs-number">1</span>
+<span class="hljs-keyword">ORDER</span> <span class="hljs-keyword">BY</span> <span class="hljs-number">2</span> <span class="hljs-keyword">DESC</span>
+</code></pre>
+<p>If you want to retrieve segment that was compacted (ANY compaction):</p>
+<pre><code class="hljs css language-sql"><span class="hljs-keyword">SELECT</span> * <span class="hljs-keyword">FROM</span> sys.segments <span class="hljs-keyword">WHERE</span> last_compaction_state <span class="hljs-keyword">is</span> <span class="hljs-keyword">not</span> <span class="hljs-literal">null</span>
+</code></pre>
+<p>or if you want to retrieve segment that was compacted only by a particular compaction spec (such as that of the auto compaction):</p>
+<pre><code class="hljs css language-sql"><span class="hljs-keyword">SELECT</span> * <span class="hljs-keyword">FROM</span> sys.segments <span class="hljs-keyword">WHERE</span> last_compaction_state == <span class="hljs-string">'SELECT * FROM sys.segments where last_compaction_state = '</span>CompactionState{partitionsSpec=DynamicPartitionsSpec{maxRowsPerSegment=<span class="hljs-number">5000000</span>, maxTotalRows=<span class="hljs-number">9223372036854775807</span>}, indexSpec={<span class="hljs-keyword">bitmap</span>={<span class="hljs-keyword">type</span>=roaring, compressRunOnSerialization=<span class="hljs-literal">true</span>}, dimensionCompression=lz4, metricCompression=lz4, longEncoding=longs, segmentLoader=<span class="hljs-literal">null</span>}}<span class="hljs-string">'
+</span></code></pre>
+<p><em>Caveat:</em> Note that a segment can be served by more than one stream ingestion tasks or Historical processes, in that case it would have multiple replicas. These replicas are weakly consistent with each other when served by multiple ingestion tasks, until a segment is eventually served by a Historical, at that point the segment is immutable. Broker prefers to query a segment from Historical over an ingestion task. But if a segment has multiple realtime replicas, for e.g.. Kafka index tasks, and one task is slower than other, then the sys.segments query results can vary for the duration of the tasks because only one of the ingestion tasks is queried by the Broker and it is not guaranteed that the same task gets picked every time. The <code>num_rows</code> column of segments table can have inconsistent values during this period. There is an open <a href="https://github.com/apache/druid/issues/5915">issue</a> about this inconsistency with stream ingestion tasks.</p>
+<h4><a class="anchor" aria-hidden="true" id="servers-table"></a><a href="#servers-table" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>SERVERS table</h4>
+<p>Servers table lists all discovered servers in the cluster.</p>
+<table>
+<thead>
+<tr><th>Column</th><th>Type</th><th>Notes</th></tr>
+</thead>
+<tbody>
+<tr><td>server</td><td>STRING</td><td>Server name in the form host:port</td></tr>
+<tr><td>host</td><td>STRING</td><td>Hostname of the server</td></tr>
+<tr><td>plaintext_port</td><td>LONG</td><td>Unsecured port of the server, or -1 if plaintext traffic is disabled</td></tr>
+<tr><td>tls_port</td><td>LONG</td><td>TLS port of the server, or -1 if TLS is disabled</td></tr>
+<tr><td>server_type</td><td>STRING</td><td>Type of Druid service. Possible values include: COORDINATOR, OVERLORD,  BROKER, ROUTER, HISTORICAL, MIDDLE_MANAGER or PEON.</td></tr>
+<tr><td>tier</td><td>STRING</td><td>Distribution tier see <a href="../configuration/index.html#historical-general-configuration">druid.server.tier</a>. Only valid for HISTORICAL type, for other types it's null</td></tr>
+<tr><td>current_size</td><td>LONG</td><td>Current size of segments in bytes on this server. Only valid for HISTORICAL type, for other types it's 0</td></tr>
+<tr><td>max_size</td><td>LONG</td><td>Max size in bytes this server recommends to assign to segments see <a href="../configuration/index.html#historical-general-configuration">druid.server.maxSize</a>. Only valid for HISTORICAL type, for other types it's 0</td></tr>
+</tbody>
+</table>
+<p>To retrieve information about all servers, use the query:</p>
+<pre><code class="hljs css language-sql"><span class="hljs-keyword">SELECT</span> * <span class="hljs-keyword">FROM</span> sys.servers;
+</code></pre>
+<h4><a class="anchor" aria-hidden="true" id="server_segments-table"></a><a href="#server_segments-table" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>SERVER_SEGMENTS table</h4>
+<p>SERVER_SEGMENTS is used to join servers with segments table</p>
+<table>
+<thead>
+<tr><th>Column</th><th>Type</th><th>Notes</th></tr>
+</thead>
+<tbody>
+<tr><td>server</td><td>STRING</td><td>Server name in format host:port (Primary key of <a href="#servers-table">servers table</a>)</td></tr>
+<tr><td>segment_id</td><td>STRING</td><td>Segment identifier (Primary key of <a href="#segments-table">segments table</a>)</td></tr>
+</tbody>
+</table>
+<p>JOIN between &quot;servers&quot; and &quot;segments&quot; can be used to query the number of segments for a specific datasource,
+grouped by server, example query:</p>
+<pre><code class="hljs css language-sql"><span class="hljs-keyword">SELECT</span> <span class="hljs-keyword">count</span>(segments.segment_id) <span class="hljs-keyword">as</span> num_segments <span class="hljs-keyword">from</span> sys.segments <span class="hljs-keyword">as</span> segments
+<span class="hljs-keyword">INNER</span> <span class="hljs-keyword">JOIN</span> sys.server_segments <span class="hljs-keyword">as</span> server_segments
+<span class="hljs-keyword">ON</span> segments.segment_id  = server_segments.segment_id
+<span class="hljs-keyword">INNER</span> <span class="hljs-keyword">JOIN</span> sys.servers <span class="hljs-keyword">as</span> servers
+<span class="hljs-keyword">ON</span> servers.server = server_segments.server
+<span class="hljs-keyword">WHERE</span> segments.datasource = <span class="hljs-string">'wikipedia'</span>
+<span class="hljs-keyword">GROUP</span> <span class="hljs-keyword">BY</span> servers.server;
+</code></pre>
+<h4><a class="anchor" aria-hidden="true" id="tasks-table"></a><a href="#tasks-table" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>TASKS table</h4>
+<p>The tasks table provides information about active and recently-completed indexing tasks. For more information
+check out the documentation for <a href="../ingestion/tasks.html">ingestion tasks</a>.</p>
+<table>
+<thead>
+<tr><th>Column</th><th>Type</th><th>Notes</th></tr>
+</thead>
+<tbody>
+<tr><td>task_id</td><td>STRING</td><td>Unique task identifier</td></tr>
+<tr><td>group_id</td><td>STRING</td><td>Task group ID for this task, the value depends on the task <code>type</code>. For example, for native index tasks, it's same as <code>task_id</code>, for sub tasks, this value is the parent task's ID</td></tr>
+<tr><td>type</td><td>STRING</td><td>Task type, for example this value is &quot;index&quot; for indexing tasks. See <a href="../ingestion/tasks.html">tasks-overview</a></td></tr>
+<tr><td>datasource</td><td>STRING</td><td>Datasource name being indexed</td></tr>
+<tr><td>created_time</td><td>STRING</td><td>Timestamp in ISO8601 format corresponding to when the ingestion task was created. Note that this value is populated for completed and waiting tasks. For running and pending tasks this value is set to 1970-01-01T00:00:00Z</td></tr>
+<tr><td>queue_insertion_time</td><td>STRING</td><td>Timestamp in ISO8601 format corresponding to when this task was added to the queue on the Overlord</td></tr>
+<tr><td>status</td><td>STRING</td><td>Status of a task can be RUNNING, FAILED, SUCCESS</td></tr>
+<tr><td>runner_status</td><td>STRING</td><td>Runner status of a completed task would be NONE, for in-progress tasks this can be RUNNING, WAITING, PENDING</td></tr>
+<tr><td>duration</td><td>LONG</td><td>Time it took to finish the task in milliseconds, this value is present only for completed tasks</td></tr>
+<tr><td>location</td><td>STRING</td><td>Server name where this task is running in the format host:port, this information is present only for RUNNING tasks</td></tr>
+<tr><td>host</td><td>STRING</td><td>Hostname of the server where task is running</td></tr>
+<tr><td>plaintext_port</td><td>LONG</td><td>Unsecured port of the server, or -1 if plaintext traffic is disabled</td></tr>
+<tr><td>tls_port</td><td>LONG</td><td>TLS port of the server, or -1 if TLS is disabled</td></tr>
+<tr><td>error_msg</td><td>STRING</td><td>Detailed error message in case of FAILED tasks</td></tr>
+</tbody>
+</table>
+<p>For example, to retrieve tasks information filtered by status, use the query</p>
+<pre><code class="hljs css language-sql"><span class="hljs-keyword">SELECT</span> * <span class="hljs-keyword">FROM</span> sys.tasks <span class="hljs-keyword">WHERE</span> <span class="hljs-keyword">status</span>=<span class="hljs-string">'FAILED'</span>;
+</code></pre>
+<h4><a class="anchor" aria-hidden="true" id="supervisors-table"></a><a href="#supervisors-table" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>SUPERVISORS table</h4>
+<p>The supervisors table provides information about supervisors.</p>
+<table>
+<thead>
+<tr><th>Column</th><th>Type</th><th>Notes</th></tr>
+</thead>
+<tbody>
+<tr><td>supervisor_id</td><td>STRING</td><td>Supervisor task identifier</td></tr>
+<tr><td>state</td><td>STRING</td><td>Basic state of the supervisor. Available states: <code>UNHEALTHY_SUPERVISOR</code>, <code>UNHEALTHY_TASKS</code>, <code>PENDING</code>, <code>RUNNING</code>, <code>SUSPENDED</code>, <code>STOPPING</code>. Check <a href="../development/extensions-core/kafka-ingestion.html#operations">Kafka Docs</a> for details.</td></tr>
+<tr><td>detailed_state</td><td>STRING</td><td>Supervisor specific state. (See documentation of the specific supervisor for details, e.g. <a href="../development/extensions-core/kafka-ingestion.html">Kafka</a> or <a href="../development/extensions-core/kinesis-ingestion.html">Kinesis</a>)</td></tr>
+<tr><td>healthy</td><td>LONG</td><td>Boolean represented as long type where 1 = true, 0 = false. 1 indicates a healthy supervisor</td></tr>
+<tr><td>type</td><td>STRING</td><td>Type of supervisor, e.g. <code>kafka</code>, <code>kinesis</code> or <code>materialized_view</code></td></tr>
+<tr><td>source</td><td>STRING</td><td>Source of the supervisor, e.g. Kafka topic or Kinesis stream</td></tr>
+<tr><td>suspended</td><td>LONG</td><td>Boolean represented as long type where 1 = true, 0 = false. 1 indicates supervisor is in suspended state</td></tr>
+<tr><td>spec</td><td>STRING</td><td>JSON-serialized supervisor spec</td></tr>
+</tbody>
+</table>
+<p>For example, to retrieve supervisor tasks information filtered by health status, use the query</p>
+<pre><code class="hljs css language-sql"><span class="hljs-keyword">SELECT</span> * <span class="hljs-keyword">FROM</span> sys.supervisors <span class="hljs-keyword">WHERE</span> healthy=<span class="hljs-number">0</span>;
+</code></pre>
+<h2><a class="anchor" aria-hidden="true" id="server-configuration"></a><a href="#server-configuration" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Server configuration</h2>
+<p>Druid SQL planning occurs on the Broker and is configured by
+<a href="../configuration/index.html#sql">Broker runtime properties</a>.</p>
+<h2><a class="anchor" aria-hidden="true" id="security"></a><a href="#security" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Security</h2>
+<p>Please see <a href="../development/extensions-core/druid-basic-security.html#sql-permissions">Defining SQL permissions</a> in the
+basic security documentation for information on what permissions are needed for making SQL queries.</p>
+</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/0.20.0/ingestion/faq.html"><span class="arrow-prev">← </span><span>Troubleshooting FAQ</span></a><a class="docs-next button" href="/docs/0.20.0/querying/querying.html"><span>Native queries</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#query-syntax">Query syntax</a><ul class="toc-headings"><li><a href="#from">FROM</a></li><li><a href="#where">WHERE</a></li><li><a href="#group-by">GROUP BY</a></li><li><a href="#having">HAVING</a></li><li><a href="#order-by">ORDER BY</a></li><li><a href="#limit">LIMIT</a></li><li><a href="#offset">OFFSET</a></li><li><a href="#union-all">UNION ALL</a></li><li><a href="#explain-plan">EXPLAIN PLAN</a></li><li><a href="#identifiers-and-literals">Identifiers and literals</a></li><li><a href="#dynamic-parameters">Dynamic parameters</a></li></ul></li><li><a href="#data-types">Data types</a><ul class="toc-headings"><li><a href="#standard-types">Standard types</a></li><li><a href="#multi-value-strings">Multi-value strings</a></li><li><a href="#null-values">NULL values</a></li></ul></li><li><a href="#aggregation-functions">Aggregation functions</a></li><li><a href="#scalar-functions">Scalar functions</a><ul class="toc-headings"><li><a href="#numeric-functions">Numeric functions</a></li><li><a href="#string-functions">String functions</a></li><li><a href="#time-functions">Time functions</a></li><li><a href="#reduction-functions">Reduction functions</a></li><li><a href="#ip-address-functions">IP address functions</a></li><li><a href="#comparison-operators">Comparison operators</a></li><li><a href="#sketch-functions">Sketch functions</a></li><li><a href="#other-scalar-functions">Other scalar functions</a></li></ul></li><li><a href="#multi-value-string-functions">Multi-value string functions</a></li><li><a href="#query-translation">Query translation</a><ul class="toc-headings"><li><a href="#best-practices">Best practices</a></li><li><a href="#interpreting-explain-plan-output">Interpreting EXPLAIN PLAN output</a></li><li><a href="#query-types">Query types</a></li><li><a href="#time-filters">Time filters</a></li><li><a href="#joins">Joins</a></li><li><a href="#subqueries">Subqueries</a></li><li><a href="#approximations">Approximations</a></li><li><a href="#unsupported-features">Unsupported features</a></li></ul></li><li><a href="#client-apis">Client APIs</a><ul class="toc-headings"><li><a href="#http-post">HTTP POST</a></li><li><a href="#jdbc">JDBC</a></li><li><a href="#dynamic-parameters-1">Dynamic Parameters</a></li><li><a href="#connection-context">Connection context</a></li></ul></li><li><a href="#metadata-tables">Metadata tables</a><ul class="toc-headings"><li><a href="#information-schema">INFORMATION SCHEMA</a></li><li><a href="#system-schema">SYSTEM SCHEMA</a></li></ul></li><li><a href="#server-configuration">Server configuration</a></li><li><a href="#security">Security</a></li></ul></nav></div><footer class="nav-footer druid-footer" id="footer"><div class="container"><div class="text-center"><p><a href="/technology">Technology</a> · <a href="/use-cases">Use Cases</a> · <a href="/druid-powered">Powered by Druid</a> · <a href="/docs/0.20.0/latest">Docs</a> · <a href="/community/">Community</a> · <a href="/downloads.html">Download</a> · <a href="/faq">FAQ</a></p></div><div class="text-center"><a title="Join the user group" href="https://groups.google.com/forum/#!forum/druid-user" target="_blank"><span class="fa fa-comments"></span></a> · <a title="Follow Druid" href="https://twitter.com/druidio" target="_blank"><span class="fab fa-twitter"></span></a> · <a title="Download via Apache" href="https://www.apache.org/dyn/closer.cgi?path=/incubator/druid/{{ site.druid_versions[0].versions[0].version }}/apache-druid-{{ site.druid_versions[0].versions[0].version }}-bin.tar.gz" target="_blank"><span class="fas fa-feather"></span></a> · <a title="GitHub" href="https://github.com/apache/druid" target="_blank"><span class="fab fa-github"></span></a></div><div class="text-center license">Copyright © 2019 <a href="https://www.apache.org/" target="_blank">Apache Software Foundation</a>.<br/>Except where otherwise noted, licensed under <a rel="license" href="http://creativecommons.org/licenses/by-sa/4.0/">CC BY-SA 4.0</a>.<br/>Apache Druid, Druid, and the Druid logo are either registered trademarks or trademarks of The Apache Software Foundation in the United States and other countries.</div></div></footer></div><script type="text/javascript" src="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.js"></script><script>
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+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>TimeBoundary queries · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/0.20.0/querying/timeboundaryquery.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.20.0" /><meta property="og:title" content="TimeBoundary queries · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
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+        </script></nav></div><div class="container mainContainer docsContainer"><div class="wrapper"><div class="post"><header class="postHeader"><a class="edit-page-link button" href="https://github.com/apache/druid/edit/master/docs/querying/timeboundaryquery.md" target="_blank" rel="noreferrer noopener">Edit</a><h1 id="__docusaurus" class="postHeaderTitle">TimeBoundary queries</h1></header><article><div><span><!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
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+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+  -->
+<blockquote>
+<p>Apache Druid supports two query languages: <a href="/docs/0.20.0/querying/sql.html">Druid SQL</a> and <a href="/docs/0.20.0/querying/querying.html">native queries</a>.
+This document describes a query
+type that is only available in the native language.</p>
+</blockquote>
+<p>Time boundary queries return the earliest and latest data points of a data set. The grammar is:</p>
+<pre><code class="hljs css language-json">{
+    "queryType" : "timeBoundary",
+    "dataSource": "sample_datasource",
+    "bound"     : &lt; "maxTime" | "minTime" &gt; # optional, defaults to returning both timestamps if not set
+    "filter"    : { "type": "and", "fields": [&lt;filter&gt;, &lt;filter&gt;, ...] } # optional
+}
+</code></pre>
+<p>There are 3 main parts to a time boundary query:</p>
+<table>
+<thead>
+<tr><th>property</th><th>description</th><th>required?</th></tr>
+</thead>
+<tbody>
+<tr><td>queryType</td><td>This String should always be &quot;timeBoundary&quot;; this is the first thing Apache Druid looks at to figure out how to interpret the query</td><td>yes</td></tr>
+<tr><td>dataSource</td><td>A String or Object defining the data source to query, very similar to a table in a relational database. See <a href="/docs/0.20.0/querying/datasource.html">DataSource</a> for more information.</td><td>yes</td></tr>
+<tr><td>bound</td><td>Optional, set to <code>maxTime</code> or <code>minTime</code> to return only the latest or earliest timestamp. Default to returning both if not set</td><td>no</td></tr>
+<tr><td>filter</td><td>See <a href="/docs/0.20.0/querying/filters.html">Filters</a></td><td>no</td></tr>
+<tr><td>context</td><td>See <a href="/docs/0.20.0/querying/query-context.html">Context</a></td><td>no</td></tr>
+</tbody>
+</table>
+<p>The format of the result is:</p>
+<pre><code class="hljs css language-json">[ {
+  <span class="hljs-attr">"timestamp"</span> : <span class="hljs-string">"2013-05-09T18:24:00.000Z"</span>,
+  <span class="hljs-attr">"result"</span> : {
+    <span class="hljs-attr">"minTime"</span> : <span class="hljs-string">"2013-05-09T18:24:00.000Z"</span>,
+    <span class="hljs-attr">"maxTime"</span> : <span class="hljs-string">"2013-05-09T18:37:00.000Z"</span>
+  }
+} ]
+</code></pre>
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+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
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+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+  -->
+<blockquote>
+<p>Apache Druid supports two query languages: <a href="/docs/0.20.0/querying/sql.html">Druid SQL</a> and <a href="/docs/0.20.0/querying/querying.html">native queries</a>.
+This document describes a query
+type in the native language. For information about when Druid SQL will use this query type, refer to the
+<a href="/docs/0.20.0/querying/sql.html#query-types">SQL documentation</a>.</p>
+</blockquote>
+<p>These types of queries take a timeseries query object and return an array of JSON objects where each object represents a value asked for by the timeseries query.</p>
+<p>An example timeseries query object is shown below:</p>
+<pre><code class="hljs css language-json">{
+  <span class="hljs-attr">"queryType"</span>: <span class="hljs-string">"timeseries"</span>,
+  <span class="hljs-attr">"dataSource"</span>: <span class="hljs-string">"sample_datasource"</span>,
+  <span class="hljs-attr">"granularity"</span>: <span class="hljs-string">"day"</span>,
+  <span class="hljs-attr">"descending"</span>: <span class="hljs-string">"true"</span>,
+  <span class="hljs-attr">"filter"</span>: {
+    <span class="hljs-attr">"type"</span>: <span class="hljs-string">"and"</span>,
+    <span class="hljs-attr">"fields"</span>: [
+      { <span class="hljs-attr">"type"</span>: <span class="hljs-string">"selector"</span>, <span class="hljs-attr">"dimension"</span>: <span class="hljs-string">"sample_dimension1"</span>, <span class="hljs-attr">"value"</span>: <span class="hljs-string">"sample_value1"</span> },
+      { <span class="hljs-attr">"type"</span>: <span class="hljs-string">"or"</span>,
+        <span class="hljs-attr">"fields"</span>: [
+          { <span class="hljs-attr">"type"</span>: <span class="hljs-string">"selector"</span>, <span class="hljs-attr">"dimension"</span>: <span class="hljs-string">"sample_dimension2"</span>, <span class="hljs-attr">"value"</span>: <span class="hljs-string">"sample_value2"</span> },
+          { <span class="hljs-attr">"type"</span>: <span class="hljs-string">"selector"</span>, <span class="hljs-attr">"dimension"</span>: <span class="hljs-string">"sample_dimension3"</span>, <span class="hljs-attr">"value"</span>: <span class="hljs-string">"sample_value3"</span> }
+        ]
+      }
+    ]
+  },
+  <span class="hljs-attr">"aggregations"</span>: [
+    { <span class="hljs-attr">"type"</span>: <span class="hljs-string">"longSum"</span>, <span class="hljs-attr">"name"</span>: <span class="hljs-string">"sample_name1"</span>, <span class="hljs-attr">"fieldName"</span>: <span class="hljs-string">"sample_fieldName1"</span> },
+    { <span class="hljs-attr">"type"</span>: <span class="hljs-string">"doubleSum"</span>, <span class="hljs-attr">"name"</span>: <span class="hljs-string">"sample_name2"</span>, <span class="hljs-attr">"fieldName"</span>: <span class="hljs-string">"sample_fieldName2"</span> }
+  ],
+  <span class="hljs-attr">"postAggregations"</span>: [
+    { <span class="hljs-attr">"type"</span>: <span class="hljs-string">"arithmetic"</span>,
+      <span class="hljs-attr">"name"</span>: <span class="hljs-string">"sample_divide"</span>,
+      <span class="hljs-attr">"fn"</span>: <span class="hljs-string">"/"</span>,
+      <span class="hljs-attr">"fields"</span>: [
+        { <span class="hljs-attr">"type"</span>: <span class="hljs-string">"fieldAccess"</span>, <span class="hljs-attr">"name"</span>: <span class="hljs-string">"postAgg__sample_name1"</span>, <span class="hljs-attr">"fieldName"</span>: <span class="hljs-string">"sample_name1"</span> },
+        { <span class="hljs-attr">"type"</span>: <span class="hljs-string">"fieldAccess"</span>, <span class="hljs-attr">"name"</span>: <span class="hljs-string">"postAgg__sample_name2"</span>, <span class="hljs-attr">"fieldName"</span>: <span class="hljs-string">"sample_name2"</span> }
+      ]
+    }
+  ],
+  <span class="hljs-attr">"intervals"</span>: [ <span class="hljs-string">"2012-01-01T00:00:00.000/2012-01-03T00:00:00.000"</span> ]
+}
+</code></pre>
+<p>There are 7 main parts to a timeseries query:</p>
+<table>
+<thead>
+<tr><th>property</th><th>description</th><th>required?</th></tr>
+</thead>
+<tbody>
+<tr><td>queryType</td><td>This String should always be &quot;timeseries&quot;; this is the first thing Apache Druid looks at to figure out how to interpret the query</td><td>yes</td></tr>
+<tr><td>dataSource</td><td>A String or Object defining the data source to query, very similar to a table in a relational database. See <a href="/docs/0.20.0/querying/datasource.html">DataSource</a> for more information.</td><td>yes</td></tr>
+<tr><td>descending</td><td>Whether to make descending ordered result. Default is <code>false</code>(ascending).</td><td>no</td></tr>
+<tr><td>intervals</td><td>A JSON Object representing ISO-8601 Intervals. This defines the time ranges to run the query over.</td><td>yes</td></tr>
+<tr><td>granularity</td><td>Defines the granularity to bucket query results. See <a href="/docs/0.20.0/querying/granularities.html">Granularities</a></td><td>yes</td></tr>
+<tr><td>filter</td><td>See <a href="/docs/0.20.0/querying/filters.html">Filters</a></td><td>no</td></tr>
+<tr><td>aggregations</td><td>See <a href="/docs/0.20.0/querying/aggregations.html">Aggregations</a></td><td>no</td></tr>
+<tr><td>postAggregations</td><td>See <a href="/docs/0.20.0/querying/post-aggregations.html">Post Aggregations</a></td><td>no</td></tr>
+<tr><td>limit</td><td>An integer that limits the number of results. The default is unlimited.</td><td>no</td></tr>
+<tr><td>context</td><td>Can be used to modify query behavior, including <a href="#grand-totals">grand totals</a> and <a href="#zero-filling">zero-filling</a>. See also <a href="/docs/0.20.0/querying/query-context.html">Context</a> for parameters that apply to all query types.</td><td>no</td></tr>
+</tbody>
+</table>
+<p>To pull it all together, the above query would return 2 data points, one for each day between 2012-01-01 and 2012-01-03, from the &quot;sample_datasource&quot; table. Each data point would be the (long) sum of sample_fieldName1, the (double) sum of sample_fieldName2 and the (double) result of sample_fieldName1 divided by sample_fieldName2 for the filter set. The output looks like this:</p>
+<pre><code class="hljs css language-json">[
+  {
+    <span class="hljs-attr">"timestamp"</span>: <span class="hljs-string">"2012-01-01T00:00:00.000Z"</span>,
+    <span class="hljs-attr">"result"</span>: { <span class="hljs-attr">"sample_name1"</span>: &lt;some_value&gt;, <span class="hljs-attr">"sample_name2"</span>: &lt;some_value&gt;, <span class="hljs-attr">"sample_divide"</span>: &lt;some_value&gt; }
+  },
+  {
+    <span class="hljs-attr">"timestamp"</span>: <span class="hljs-string">"2012-01-02T00:00:00.000Z"</span>,
+    <span class="hljs-attr">"result"</span>: { <span class="hljs-attr">"sample_name1"</span>: &lt;some_value&gt;, <span class="hljs-attr">"sample_name2"</span>: &lt;some_value&gt;, <span class="hljs-attr">"sample_divide"</span>: &lt;some_value&gt; }
+  }
+]
+</code></pre>
+<h2><a class="anchor" aria-hidden="true" id="grand-totals"></a><a href="#grand-totals" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Grand totals</h2>
+<p>Druid can include an extra &quot;grand totals&quot; row as the last row of a timeseries result set. To enable this, add
+<code>&quot;grandTotal&quot; : true</code> to your query context. For example:</p>
+<pre><code class="hljs css language-json">{
+  <span class="hljs-attr">"queryType"</span>: <span class="hljs-string">"timeseries"</span>,
+  <span class="hljs-attr">"dataSource"</span>: <span class="hljs-string">"sample_datasource"</span>,
+  <span class="hljs-attr">"intervals"</span>: [ <span class="hljs-string">"2012-01-01T00:00:00.000/2012-01-03T00:00:00.000"</span> ],
+  <span class="hljs-attr">"granularity"</span>: <span class="hljs-string">"day"</span>,
+  <span class="hljs-attr">"aggregations"</span>: [
+    { <span class="hljs-attr">"type"</span>: <span class="hljs-string">"longSum"</span>, <span class="hljs-attr">"name"</span>: <span class="hljs-string">"sample_name1"</span>, <span class="hljs-attr">"fieldName"</span>: <span class="hljs-string">"sample_fieldName1"</span> },
+    { <span class="hljs-attr">"type"</span>: <span class="hljs-string">"doubleSum"</span>, <span class="hljs-attr">"name"</span>: <span class="hljs-string">"sample_name2"</span>, <span class="hljs-attr">"fieldName"</span>: <span class="hljs-string">"sample_fieldName2"</span> }
+  ],
+  <span class="hljs-attr">"context"</span>: {
+    <span class="hljs-attr">"grandTotal"</span>: <span class="hljs-literal">true</span>
+  }
+}
+</code></pre>
+<p>The grand totals row will appear as the last row in the result array, and will have no timestamp. It will be the last
+row even if the query is run in &quot;descending&quot; mode. Post-aggregations in the grand totals row will be computed based
+upon the grand total aggregations.</p>
+<h2><a class="anchor" aria-hidden="true" id="zero-filling"></a><a href="#zero-filling" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Zero-filling</h2>
+<p>Timeseries queries normally fill empty interior time buckets with zeroes. For example, if you issue a &quot;day&quot; granularity
+timeseries query for the interval 2012-01-01/2012-01-04, and no data exists for 2012-01-02, you will receive:</p>
+<pre><code class="hljs css language-json">[
+  {
+    <span class="hljs-attr">"timestamp"</span>: <span class="hljs-string">"2012-01-01T00:00:00.000Z"</span>,
+    <span class="hljs-attr">"result"</span>: { <span class="hljs-attr">"sample_name1"</span>: &lt;some_value&gt; }
+  },
+  {
+   <span class="hljs-attr">"timestamp"</span>: <span class="hljs-string">"2012-01-02T00:00:00.000Z"</span>,
+   <span class="hljs-attr">"result"</span>: { <span class="hljs-attr">"sample_name1"</span>: <span class="hljs-number">0</span> }
+  },
+  {
+    <span class="hljs-attr">"timestamp"</span>: <span class="hljs-string">"2012-01-03T00:00:00.000Z"</span>,
+    <span class="hljs-attr">"result"</span>: { <span class="hljs-attr">"sample_name1"</span>: &lt;some_value&gt; }
+  }
+]
+</code></pre>
+<p>Time buckets that lie completely outside the data interval are not zero-filled.</p>
+<p>You can disable all zero-filling with the context flag &quot;skipEmptyBuckets&quot;. In this mode, the data point for 2012-01-02
+would be omitted from the results.</p>
+<p>A query with this context flag set would look like:</p>
+<pre><code class="hljs css language-json">{
+  <span class="hljs-attr">"queryType"</span>: <span class="hljs-string">"timeseries"</span>,
+  <span class="hljs-attr">"dataSource"</span>: <span class="hljs-string">"sample_datasource"</span>,
+  <span class="hljs-attr">"granularity"</span>: <span class="hljs-string">"day"</span>,
+  <span class="hljs-attr">"aggregations"</span>: [
+    { <span class="hljs-attr">"type"</span>: <span class="hljs-string">"longSum"</span>, <span class="hljs-attr">"name"</span>: <span class="hljs-string">"sample_name1"</span>, <span class="hljs-attr">"fieldName"</span>: <span class="hljs-string">"sample_fieldName1"</span> }
+  ],
+  <span class="hljs-attr">"intervals"</span>: [ <span class="hljs-string">"2012-01-01T00:00:00.000/2012-01-04T00:00:00.000"</span> ],
+  <span class="hljs-attr">"context"</span> : {
+    <span class="hljs-attr">"skipEmptyBuckets"</span>: <span class="hljs-string">"true"</span>
+  }
+}
+</code></pre>
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+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
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+<blockquote>
+<p>Apache Druid supports two query languages: <a href="/docs/0.20.0/querying/sql.html">Druid SQL</a> and <a href="/docs/0.20.0/querying/querying.html">native queries</a>.
+This document describes the native
+language. For information about sorting in SQL, refer to the <a href="/docs/0.20.0/querying/sql.html#order-by">SQL documentation</a>.</p>
+</blockquote>
+<p>In Apache Druid, the topN metric spec specifies how topN values should be sorted.</p>
+<h2><a class="anchor" aria-hidden="true" id="numeric-topnmetricspec"></a><a href="#numeric-topnmetricspec" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Numeric TopNMetricSpec</h2>
+<p>The simplest metric specification is a String value indicating the metric to sort topN results by. They are included in a topN query with:</p>
+<pre><code class="hljs css language-json">"metric": "&lt;metric_name&gt;"
+</code></pre>
+<p>The metric field can also be given as a JSON object. The grammar for dimension values sorted by numeric value is shown below:</p>
+<pre><code class="hljs css language-json">"metric": {
+    "type": "numeric",
+    "metric": "&lt;metric_name&gt;"
+}
+</code></pre>
+<table>
+<thead>
+<tr><th>property</th><th>description</th><th>required?</th></tr>
+</thead>
+<tbody>
+<tr><td>type</td><td>this indicates a numeric sort</td><td>yes</td></tr>
+<tr><td>metric</td><td>the actual metric field in which results will be sorted by</td><td>yes</td></tr>
+</tbody>
+</table>
+<h2><a class="anchor" aria-hidden="true" id="dimension-topnmetricspec"></a><a href="#dimension-topnmetricspec" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Dimension TopNMetricSpec</h2>
+<p>This metric specification sorts TopN results by dimension value, using one of the sorting orders described here: <a href="/docs/0.20.0/querying/sorting-orders.html">Sorting Orders</a></p>
+<table>
+<thead>
+<tr><th>property</th><th>type</th><th>description</th><th>required?</th></tr>
+</thead>
+<tbody>
+<tr><td>type</td><td>String</td><td>this indicates a sort a dimension's values</td><td>yes, must be 'dimension'</td></tr>
+<tr><td>ordering</td><td>String</td><td>Specifies the sorting order. Can be one of the following values: &quot;lexicographic&quot;, &quot;alphanumeric&quot;, &quot;numeric&quot;, &quot;strlen&quot;. See <a href="/docs/0.20.0/querying/sorting-orders.html">Sorting Orders</a> for more details.</td><td>no, default: &quot;lexicographic&quot;</td></tr>
+<tr><td>previousStop</td><td>String</td><td>the starting point of the sort. For example, if a previousStop value is 'b', all values before 'b' are discarded. This field can be used to paginate through all the dimension values.</td><td>no</td></tr>
+</tbody>
+</table>
+<p>The following metricSpec uses lexicographic sorting.</p>
+<pre><code class="hljs css language-json">"metric": {
+    "type": "dimension",
+    "ordering": "lexicographic",
+    "previousStop": "&lt;previousStop_value&gt;"
+}
+</code></pre>
+<p>Note that in earlier versions of Druid, the functionality provided by the DimensionTopNMetricSpec was handled by two separate spec types, Lexicographic and Alphanumeric (when only two sorting orders were supported). These spec types have been deprecated but are still usable.</p>
+<h2><a class="anchor" aria-hidden="true" id="inverted-topnmetricspec"></a><a href="#inverted-topnmetricspec" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Inverted TopNMetricSpec</h2>
+<p>Sort dimension values in inverted order, i.e inverts the order of the delegate metric spec. It can be used to sort the values in ascending order.</p>
+<pre><code class="hljs css language-json">"metric": {
+    "type": "inverted",
+    "metric": &lt;delegate_top_n_metric_spec&gt;
+}
+</code></pre>
+<table>
+<thead>
+<tr><th>property</th><th>description</th><th>required?</th></tr>
+</thead>
+<tbody>
+<tr><td>type</td><td>this indicates an inverted sort</td><td>yes</td></tr>
+<tr><td>metric</td><td>the delegate metric spec.</td><td>yes</td></tr>
+</tbody>
+</table>
+</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/0.20.0/querying/limitspec.html"><span class="arrow-prev">← </span><span class="function-name-prevnext">Sorting and limiting (groupBy)</span></a><a class="docs-next button" href="/docs/0.20.0/querying/sorting-orders.html"><span>String comparators</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#numeric-topnmetricspec">Numeric TopNMetricSpec</a></li><li><a href="#dimension-topnmetricspec">Dimension TopNMetricSpec</a></li><li><a href="#inverted-topnmetricspec">Inverted TopNMetricSpec</a></li></ul></nav></div><footer class="nav-footer druid-footer" id="footer"><div class="container"><div class="text-center"><p><a href="/technology">Technology</a> · <a href="/use-cases">Use Cases</a> · <a href="/druid-powered">Powered by Druid</a> · <a href="/docs/0.20.0/latest">Docs</a> · <a href="/community/">Community</a> · <a href="/downloads.html">Download</a> · <a href="/faq">FAQ</a></p></div><div class="text-center"><a title="Join the user group" href="https://groups.google.com/forum/#!forum/druid-user" target="_blank"><span class="fa fa-comments"></span></a> · <a title="Follow Druid" href="https://twitter.com/druidio" target="_blank"><span class="fab fa-twitter"></span></a> · <a title="Download via Apache" href="https://www.apache.org/dyn/closer.cgi?path=/incubator/druid/{{ site.druid_versions[0].versions[0].version }}/apache-druid-{{ site.druid_versions[0].versions[0].version }}-bin.tar.gz" target="_blank"><span class="fas fa-feather"></span></a> · <a title="GitHub" href="https://github.com/apache/druid" target="_blank"><span class="fab fa-github"></span></a></div><div class="text-center license">Copyright © 2019 <a href="https://www.apache.org/" target="_blank">Apache Software Foundation</a>.<br/>Except where otherwise noted, licensed under <a rel="license" href="http://creativecommons.org/licenses/by-sa/4.0/">CC BY-SA 4.0</a>.<br/>Apache Druid, Druid, and the Druid logo are either registered trademarks or trademarks of The Apache Software Foundation in the United States and other countries.</div></div></footer></div><script type="text/javascript" src="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.js"></script><script>
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UIs</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/operations/deep-storage-migration.html">Deep storage migration</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/operations/export-metadata.html">Export Metadata Tool</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/operations/metadata-migration.html">Metadata Migration</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/operations/segment-optimization.html">Segment Size Optimization</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/operations/use_sbt_to_build_fat_jar.html">Content for build.sbt</a></li></ul></div></ul></div><div class="navGroup"><h3 class="navGroupCategoryTitle collapsible">Development<span class="arrow"><svg width="24" height="24" viewBox="0 0 24 24"><path fill="#565656" d="M7.41 15.41L12 10.83l4.59 4.58L18 14l-6-6-6 6z"></path><path d="M0 0h24v24H0z" fill="none"></path></svg></span></h3><ul class="hide"><li 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class="navListItem"><a class="navItem" href="/docs/0.20.0/comparisons/druid-vs-spark.html">Apache Druid vs Spark</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/comparisons/druid-vs-sql-on-hadoop.html">Apache Druid vs SQL-on-Hadoop</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/design/auth.html">Authentication and Authorization</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/design/broker.html">Broker</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/design/coordinator.html">Coordinator Process</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/design/historical.html">Historical Process</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/design/indexer.html">Indexer Process</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/design/indexing-service.html">Indexing Service</a></li><li class="navListItem"><a class="navItem" 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href="/docs/0.20.0/development/extensions-core/datasketches-extension.html">DataSketches extension</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-core/datasketches-hll.html">DataSketches HLL Sketch module</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-core/datasketches-quantiles.html">DataSketches Quantiles Sketch module</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-core/datasketches-theta.html">DataSketches Theta Sketch module</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-core/datasketches-tuple.html">DataSketches Tuple Sketch module</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/extensions-core/druid-basic-security.html">Basic Security</a></li><li class="navListItem"><a class="navItem" 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+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
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+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+  -->
+<blockquote>
+<p>Apache Druid supports two query languages: <a href="/docs/0.20.0/querying/sql.html">Druid SQL</a> and <a href="/docs/0.20.0/querying/querying.html">native queries</a>.
+This document describes a query
+type in the native language. For information about when Druid SQL will use this query type, refer to the
+<a href="/docs/0.20.0/querying/sql.html#query-types">SQL documentation</a>.</p>
+</blockquote>
+<p>Apache Druid TopN queries return a sorted set of results for the values in a given dimension according to some criteria. Conceptually, they can be thought of as an approximate <a href="/docs/0.20.0/querying/groupbyquery.html">GroupByQuery</a> over a single dimension with an <a href="/docs/0.20.0/querying/limitspec.html">Ordering</a> spec. TopNs are much faster and resource efficient than GroupBys for this use case. These types of queries take a topN query object and return an array of JSON objects where each object represents a value asked for by the topN query.</p>
+<p>TopNs are approximate in that each data process will rank their top K results and only return those top K results to the Broker. K, by default in Druid, is <code>max(1000, threshold)</code>. In practice, this means that if you ask for the top 1000 items ordered, the correctness of the first ~900 items will be 100%, and the ordering of the results after that is not guaranteed. TopNs can be made more accurate by increasing the threshold.</p>
+<p>A topN query object looks like:</p>
+<pre><code class="hljs css language-json">{
+  <span class="hljs-attr">"queryType"</span>: <span class="hljs-string">"topN"</span>,
+  <span class="hljs-attr">"dataSource"</span>: <span class="hljs-string">"sample_data"</span>,
+  <span class="hljs-attr">"dimension"</span>: <span class="hljs-string">"sample_dim"</span>,
+  <span class="hljs-attr">"threshold"</span>: <span class="hljs-number">5</span>,
+  <span class="hljs-attr">"metric"</span>: <span class="hljs-string">"count"</span>,
+  <span class="hljs-attr">"granularity"</span>: <span class="hljs-string">"all"</span>,
+  <span class="hljs-attr">"filter"</span>: {
+    <span class="hljs-attr">"type"</span>: <span class="hljs-string">"and"</span>,
+    <span class="hljs-attr">"fields"</span>: [
+      {
+        <span class="hljs-attr">"type"</span>: <span class="hljs-string">"selector"</span>,
+        <span class="hljs-attr">"dimension"</span>: <span class="hljs-string">"dim1"</span>,
+        <span class="hljs-attr">"value"</span>: <span class="hljs-string">"some_value"</span>
+      },
+      {
+        <span class="hljs-attr">"type"</span>: <span class="hljs-string">"selector"</span>,
+        <span class="hljs-attr">"dimension"</span>: <span class="hljs-string">"dim2"</span>,
+        <span class="hljs-attr">"value"</span>: <span class="hljs-string">"some_other_val"</span>
+      }
+    ]
+  },
+  <span class="hljs-attr">"aggregations"</span>: [
+    {
+      <span class="hljs-attr">"type"</span>: <span class="hljs-string">"longSum"</span>,
+      <span class="hljs-attr">"name"</span>: <span class="hljs-string">"count"</span>,
+      <span class="hljs-attr">"fieldName"</span>: <span class="hljs-string">"count"</span>
+    },
+    {
+      <span class="hljs-attr">"type"</span>: <span class="hljs-string">"doubleSum"</span>,
+      <span class="hljs-attr">"name"</span>: <span class="hljs-string">"some_metric"</span>,
+      <span class="hljs-attr">"fieldName"</span>: <span class="hljs-string">"some_metric"</span>
+    }
+  ],
+  <span class="hljs-attr">"postAggregations"</span>: [
+    {
+      <span class="hljs-attr">"type"</span>: <span class="hljs-string">"arithmetic"</span>,
+      <span class="hljs-attr">"name"</span>: <span class="hljs-string">"average"</span>,
+      <span class="hljs-attr">"fn"</span>: <span class="hljs-string">"/"</span>,
+      <span class="hljs-attr">"fields"</span>: [
+        {
+          <span class="hljs-attr">"type"</span>: <span class="hljs-string">"fieldAccess"</span>,
+          <span class="hljs-attr">"name"</span>: <span class="hljs-string">"some_metric"</span>,
+          <span class="hljs-attr">"fieldName"</span>: <span class="hljs-string">"some_metric"</span>
+        },
+        {
+          <span class="hljs-attr">"type"</span>: <span class="hljs-string">"fieldAccess"</span>,
+          <span class="hljs-attr">"name"</span>: <span class="hljs-string">"count"</span>,
+          <span class="hljs-attr">"fieldName"</span>: <span class="hljs-string">"count"</span>
+        }
+      ]
+    }
+  ],
+  <span class="hljs-attr">"intervals"</span>: [
+    <span class="hljs-string">"2013-08-31T00:00:00.000/2013-09-03T00:00:00.000"</span>
+  ]
+}
+</code></pre>
+<p>There are 11 parts to a topN query.</p>
+<table>
+<thead>
+<tr><th>property</th><th>description</th><th>required?</th></tr>
+</thead>
+<tbody>
+<tr><td>queryType</td><td>This String should always be &quot;topN&quot;; this is the first thing Druid looks at to figure out how to interpret the query</td><td>yes</td></tr>
+<tr><td>dataSource</td><td>A String or Object defining the data source to query, very similar to a table in a relational database. See <a href="/docs/0.20.0/querying/datasource.html">DataSource</a> for more information.</td><td>yes</td></tr>
+<tr><td>intervals</td><td>A JSON Object representing ISO-8601 Intervals. This defines the time ranges to run the query over.</td><td>yes</td></tr>
+<tr><td>granularity</td><td>Defines the granularity to bucket query results. See <a href="/docs/0.20.0/querying/granularities.html">Granularities</a></td><td>yes</td></tr>
+<tr><td>filter</td><td>See <a href="/docs/0.20.0/querying/filters.html">Filters</a></td><td>no</td></tr>
+<tr><td>aggregations</td><td>See <a href="/docs/0.20.0/querying/aggregations.html">Aggregations</a></td><td>for numeric metricSpec, aggregations or postAggregations should be specified. Otherwise no.</td></tr>
+<tr><td>postAggregations</td><td>See <a href="/docs/0.20.0/querying/post-aggregations.html">Post Aggregations</a></td><td>for numeric metricSpec, aggregations or postAggregations should be specified. Otherwise no.</td></tr>
+<tr><td>dimension</td><td>A String or JSON object defining the dimension that you want the top taken for. For more info, see <a href="/docs/0.20.0/querying/dimensionspecs.html">DimensionSpecs</a></td><td>yes</td></tr>
+<tr><td>threshold</td><td>An integer defining the N in the topN (i.e. how many results you want in the top list)</td><td>yes</td></tr>
+<tr><td>metric</td><td>A String or JSON object specifying the metric to sort by for the top list. For more info, see <a href="/docs/0.20.0/querying/topnmetricspec.html">TopNMetricSpec</a>.</td><td>yes</td></tr>
+<tr><td>context</td><td>See <a href="/docs/0.20.0/querying/query-context.html">Context</a></td><td>no</td></tr>
+</tbody>
+</table>
+<p>Please note the context JSON object is also available for topN queries and should be used with the same caution as the timeseries case.
+The format of the results would look like so:</p>
+<pre><code class="hljs css language-json">[
+  {
+    <span class="hljs-attr">"timestamp"</span>: <span class="hljs-string">"2013-08-31T00:00:00.000Z"</span>,
+    <span class="hljs-attr">"result"</span>: [
+      {
+        <span class="hljs-attr">"dim1"</span>: <span class="hljs-string">"dim1_val"</span>,
+        <span class="hljs-attr">"count"</span>: <span class="hljs-number">111</span>,
+        <span class="hljs-attr">"some_metrics"</span>: <span class="hljs-number">10669</span>,
+        <span class="hljs-attr">"average"</span>: <span class="hljs-number">96.11711711711712</span>
+      },
+      {
+        <span class="hljs-attr">"dim1"</span>: <span class="hljs-string">"another_dim1_val"</span>,
+        <span class="hljs-attr">"count"</span>: <span class="hljs-number">88</span>,
+        <span class="hljs-attr">"some_metrics"</span>: <span class="hljs-number">28344</span>,
+        <span class="hljs-attr">"average"</span>: <span class="hljs-number">322.09090909090907</span>
+      },
+      {
+        <span class="hljs-attr">"dim1"</span>: <span class="hljs-string">"dim1_val3"</span>,
+        <span class="hljs-attr">"count"</span>: <span class="hljs-number">70</span>,
+        <span class="hljs-attr">"some_metrics"</span>: <span class="hljs-number">871</span>,
+        <span class="hljs-attr">"average"</span>: <span class="hljs-number">12.442857142857143</span>
+      },
+      {
+        <span class="hljs-attr">"dim1"</span>: <span class="hljs-string">"dim1_val4"</span>,
+        <span class="hljs-attr">"count"</span>: <span class="hljs-number">62</span>,
+        <span class="hljs-attr">"some_metrics"</span>: <span class="hljs-number">815</span>,
+        <span class="hljs-attr">"average"</span>: <span class="hljs-number">13.14516129032258</span>
+      },
+      {
+        <span class="hljs-attr">"dim1"</span>: <span class="hljs-string">"dim1_val5"</span>,
+        <span class="hljs-attr">"count"</span>: <span class="hljs-number">60</span>,
+        <span class="hljs-attr">"some_metrics"</span>: <span class="hljs-number">2787</span>,
+        <span class="hljs-attr">"average"</span>: <span class="hljs-number">46.45</span>
+      }
+    ]
+  }
+]
+</code></pre>
+<h2><a class="anchor" aria-hidden="true" id="behavior-on-multi-value-dimensions"></a><a href="#behavior-on-multi-value-dimensions" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Behavior on multi-value dimensions</h2>
+<p>topN queries can group on multi-value dimensions. When grouping on a multi-value dimension, <em>all</em> values
+from matching rows will be used to generate one group per value. It's possible for a query to return more groups than
+there are rows. For example, a topN on the dimension <code>tags</code> with filter <code>&quot;t1&quot; AND &quot;t3&quot;</code> would match only row1, and
+generate a result with three groups: <code>t1</code>, <code>t2</code>, and <code>t3</code>. If you only need to include values that match
+your filter, you can use a <a href="dimensionspecs.html#filtered-dimensionspecs">filtered dimensionSpec</a>. This can also
+improve performance.</p>
+<p>See <a href="multi-value-dimensions.html">Multi-value dimensions</a> for more details.</p>
+<h2><a class="anchor" aria-hidden="true" id="aliasing"></a><a href="#aliasing" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Aliasing</h2>
+<p>The current TopN algorithm is an approximate algorithm. The top 1000 local results from each segment are returned for merging to determine the global topN. As such, the topN algorithm is approximate in both rank and results. Approximate results <em>ONLY APPLY WHEN THERE ARE MORE THAN 1000 DIM VALUES</em>. A topN over a dimension with fewer than 1000 unique dimension values can be considered accurate in rank and accurate in aggregates.</p>
+<p>The threshold can be modified from it's default 1000 via the server parameter <code>druid.query.topN.minTopNThreshold</code> which need to restart servers to take effect or set <code>minTopNThreshold</code> in query context which take effect per query.</p>
+<p>If you are wanting the top 100 of a high cardinality, uniformly distributed dimension ordered by some low-cardinality, uniformly distributed dimension, you are potentially going to get aggregates back that are missing data.</p>
+<p>To put it another way, the best use cases for topN are when you can have confidence that the overall results are uniformly in the top. For example, if a particular site ID is in the top 10 for some metric for every hour of every day, then it will probably be accurate in the topN over multiple days. But if a site barely in the top 1000 for any given hour, but over the whole query granularity is in the top 500 (example: a site which gets highly uniform traffic co-mingling in the dataset with sites with highly periodic data), then a top500 query may not have that particular site a the exact rank, and may not be accurate for that particular site's aggregates.</p>
+<p>Before continuing in this section, please consider if you really need exact results. Getting exact results is a very resource intensive process. For the vast majority of &quot;useful&quot; data results, an approximate topN algorithm supplies plenty of accuracy.</p>
+<p>Users wishing to get an <em>exact rank and exact aggregates</em> topN over a dimension with greater than 1000 unique values should issue a groupBy query and sort the results themselves. This is very computationally expensive for high-cardinality dimensions.</p>
+<p>Users who can tolerate <em>approximate rank</em> topN over a dimension with greater than 1000 unique values, but require <em>exact aggregates</em> can issue two queries. One to get the approximate topN dimension values, and another topN with dimension selection filters which only use the topN results of the first.</p>
+<h3><a class="anchor" aria-hidden="true" id="example-first-query"></a><a href="#example-first-query" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Example First query</h3>
+<pre><code class="hljs css language-json">{
+    <span class="hljs-attr">"aggregations"</span>: [
+         {
+             <span class="hljs-attr">"fieldName"</span>: <span class="hljs-string">"L_QUANTITY_longSum"</span>,
+             <span class="hljs-attr">"name"</span>: <span class="hljs-string">"L_QUANTITY_"</span>,
+             <span class="hljs-attr">"type"</span>: <span class="hljs-string">"longSum"</span>
+         }
+    ],
+    <span class="hljs-attr">"dataSource"</span>: <span class="hljs-string">"tpch_year"</span>,
+    <span class="hljs-attr">"dimension"</span>:<span class="hljs-string">"l_orderkey"</span>,
+    <span class="hljs-attr">"granularity"</span>: <span class="hljs-string">"all"</span>,
+    <span class="hljs-attr">"intervals"</span>: [
+        <span class="hljs-string">"1900-01-09T00:00:00.000Z/2992-01-10T00:00:00.000Z"</span>
+    ],
+    <span class="hljs-attr">"metric"</span>: <span class="hljs-string">"L_QUANTITY_"</span>,
+    <span class="hljs-attr">"queryType"</span>: <span class="hljs-string">"topN"</span>,
+    <span class="hljs-attr">"threshold"</span>: <span class="hljs-number">2</span>
+}
+</code></pre>
+<h3><a class="anchor" aria-hidden="true" id="example-second-query"></a><a href="#example-second-query" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Example second query</h3>
+<pre><code class="hljs css language-json">{
+    <span class="hljs-attr">"aggregations"</span>: [
+         {
+             <span class="hljs-attr">"fieldName"</span>: <span class="hljs-string">"L_TAX_doubleSum"</span>,
+             <span class="hljs-attr">"name"</span>: <span class="hljs-string">"L_TAX_"</span>,
+             <span class="hljs-attr">"type"</span>: <span class="hljs-string">"doubleSum"</span>
+         },
+         {
+             <span class="hljs-attr">"fieldName"</span>: <span class="hljs-string">"L_DISCOUNT_doubleSum"</span>,
+             <span class="hljs-attr">"name"</span>: <span class="hljs-string">"L_DISCOUNT_"</span>,
+             <span class="hljs-attr">"type"</span>: <span class="hljs-string">"doubleSum"</span>
+         },
+         {
+             <span class="hljs-attr">"fieldName"</span>: <span class="hljs-string">"L_EXTENDEDPRICE_doubleSum"</span>,
+             <span class="hljs-attr">"name"</span>: <span class="hljs-string">"L_EXTENDEDPRICE_"</span>,
+             <span class="hljs-attr">"type"</span>: <span class="hljs-string">"doubleSum"</span>
+         },
+         {
+             <span class="hljs-attr">"fieldName"</span>: <span class="hljs-string">"L_QUANTITY_longSum"</span>,
+             <span class="hljs-attr">"name"</span>: <span class="hljs-string">"L_QUANTITY_"</span>,
+             <span class="hljs-attr">"type"</span>: <span class="hljs-string">"longSum"</span>
+         },
+         {
+             <span class="hljs-attr">"name"</span>: <span class="hljs-string">"count"</span>,
+             <span class="hljs-attr">"type"</span>: <span class="hljs-string">"count"</span>
+         }
+    ],
+    <span class="hljs-attr">"dataSource"</span>: <span class="hljs-string">"tpch_year"</span>,
+    <span class="hljs-attr">"dimension"</span>:<span class="hljs-string">"l_orderkey"</span>,
+    <span class="hljs-attr">"filter"</span>: {
+        <span class="hljs-attr">"fields"</span>: [
+            {
+                <span class="hljs-attr">"dimension"</span>: <span class="hljs-string">"l_orderkey"</span>,
+                <span class="hljs-attr">"type"</span>: <span class="hljs-string">"selector"</span>,
+                <span class="hljs-attr">"value"</span>: <span class="hljs-string">"103136"</span>
+            },
+            {
+                <span class="hljs-attr">"dimension"</span>: <span class="hljs-string">"l_orderkey"</span>,
+                <span class="hljs-attr">"type"</span>: <span class="hljs-string">"selector"</span>,
+                <span class="hljs-attr">"value"</span>: <span class="hljs-string">"1648672"</span>
+            }
+        ],
+        <span class="hljs-attr">"type"</span>: <span class="hljs-string">"or"</span>
+    },
+    <span class="hljs-attr">"granularity"</span>: <span class="hljs-string">"all"</span>,
+    <span class="hljs-attr">"intervals"</span>: [
+        <span class="hljs-string">"1900-01-09T00:00:00.000Z/2992-01-10T00:00:00.000Z"</span>
+    ],
+    <span class="hljs-attr">"metric"</span>: <span class="hljs-string">"L_QUANTITY_"</span>,
+    <span class="hljs-attr">"queryType"</span>: <span class="hljs-string">"topN"</span>,
+    <span class="hljs-attr">"threshold"</span>: <span class="hljs-number">2</span>
+}
+</code></pre>
+</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/0.20.0/querying/timeseriesquery.html"><span class="arrow-prev">← </span><span>Timeseries</span></a><a class="docs-next button" href="/docs/0.20.0/querying/groupbyquery.html"><span class="function-name-prevnext">GroupBy</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#behavior-on-multi-value-dimensions">Behavior on multi-value dimensions</a></li><li><a href="#aliasing">Aliasing</a><ul class="toc-headings"><li><a href="#example-first-query">Example First query</a></li><li><a href="#example-second-query">Example second query</a></li></ul></li></ul></nav></div><footer class="nav-footer druid-footer" id="footer"><div class="container"><div class="text-center"><p><a href="/technology">Technology</a> · <a href="/use-cases">Use Cases</a> · <a href="/druid-powered">Powered by Druid</a> · <a href="/docs/0.20.0/latest">Docs</a> · <a href="/community/">Community</a> · <a href="/downloads.html">Download</a> · <a href="/faq">FAQ</a></p></div><div class="text-center"><a title="Join the user group" href="https://groups.google.com/forum/#!forum/druid-user" target="_blank"><span class="fa fa-comments"></span></a> · <a title="Follow Druid" href="https://twitter.com/druidio" target="_blank"><span class="fab fa-twitter"></span></a> · <a title="Download via Apache" href="https://www.apache.org/dyn/closer.cgi?path=/incubator/druid/{{ site.druid_versions[0].versions[0].version }}/apache-druid-{{ site.druid_versions[0].versions[0].version }}-bin.tar.gz" target="_blank"><span class="fas fa-feather"></span></a> · <a title="GitHub" href="https://github.com/apache/druid" target="_blank"><span class="fab fa-github"></span></a></div><div class="text-center license">Copyright © 2019 <a href="https://www.apache.org/" target="_blank">Apache Software Foundation</a>.<br/>Except where otherwise noted, licensed under <a rel="license" href="http://creativecommons.org/licenses/by-sa/4.0/">CC BY-SA 4.0</a>.<br/>Apache Druid, Druid, and the Druid logo are either registered trademarks or trademarks of The Apache Software Foundation in the United States and other countries.</div></div></footer></div><script type="text/javascript" src="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.js"></script><script>
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@@ -0,0 +1,152 @@
+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Virtual columns · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/0.20.0/querying/virtual-columns.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.20.0" /><meta property="og:title" content="Virtual columns · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
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+  ~ or more contributor license agreements.  See the NOTICE file
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+<blockquote>
+<p>Apache Druid supports two query languages: <a href="/docs/0.20.0/querying/sql.html">Druid SQL</a> and <a href="/docs/0.20.0/querying/querying.html">native queries</a>.
+This document describes the native
+language. For information about functions available in SQL, refer to the
+<a href="/docs/0.20.0/querying/sql.html#scalar-functions">SQL documentation</a>.</p>
+</blockquote>
+<p>Virtual columns are queryable column &quot;views&quot; created from a set of columns during a query.</p>
+<p>A virtual column can potentially draw from multiple underlying columns, although a virtual column always presents itself as a single column.</p>
+<p>Virtual columns can be used as dimensions or as inputs to aggregators.</p>
+<p>Each Apache Druid query can accept a list of virtual columns as a parameter. The following scan query is provided as an example:</p>
+<pre><code class="hljs">{
+ <span class="hljs-attr">"queryType"</span>: <span class="hljs-string">"scan"</span>,
+ <span class="hljs-attr">"dataSource"</span>: <span class="hljs-string">"page_data"</span>,
+ <span class="hljs-attr">"columns"</span>:[],
+ <span class="hljs-attr">"virtualColumns"</span>: [
+    {
+      <span class="hljs-attr">"type"</span>: <span class="hljs-string">"expression"</span>,
+      <span class="hljs-attr">"name"</span>: <span class="hljs-string">"fooPage"</span>,
+      <span class="hljs-attr">"expression"</span>: <span class="hljs-string">"concat('foo' + page)"</span>,
+      <span class="hljs-attr">"outputType"</span>: <span class="hljs-string">"STRING"</span>
+    },
+    {
+      <span class="hljs-attr">"type"</span>: <span class="hljs-string">"expression"</span>,
+      <span class="hljs-attr">"name"</span>: <span class="hljs-string">"tripleWordCount"</span>,
+      <span class="hljs-attr">"expression"</span>: <span class="hljs-string">"wordCount * 3"</span>,
+      <span class="hljs-attr">"outputType"</span>: <span class="hljs-string">"LONG"</span>
+    }
+  ],
+ <span class="hljs-attr">"intervals"</span>: [
+   <span class="hljs-string">"2013-01-01/2019-01-02"</span>
+ ]
+}
+</code></pre>
+<h2><a class="anchor" aria-hidden="true" id="virtual-column-types"></a><a href="#virtual-column-types" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Virtual column types</h2>
+<h3><a class="anchor" aria-hidden="true" id="expression-virtual-column"></a><a href="#expression-virtual-column" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Expression virtual column</h3>
+<p>The expression virtual column has the following syntax:</p>
+<pre><code class="hljs">{
+  <span class="hljs-string">"type"</span>: <span class="hljs-string">"expression"</span>,
+  <span class="hljs-string">"name"</span>: &lt;name of the virtual column&gt;,
+  <span class="hljs-string">"expression"</span>: &lt;row expression&gt;,
+  <span class="hljs-string">"outputType"</span>: &lt;output value<span class="hljs-built_in"> type </span>of expression&gt;
+}
+</code></pre>
+<table>
+<thead>
+<tr><th>property</th><th>description</th><th>required?</th></tr>
+</thead>
+<tbody>
+<tr><td>name</td><td>The name of the virtual column.</td><td>yes</td></tr>
+<tr><td>expression</td><td>An <a href="/docs/0.20.0/misc/math-expr.html">expression</a> that takes a row as input and outputs a value for the virtual column.</td><td>yes</td></tr>
+<tr><td>outputType</td><td>The expression's output will be coerced to this type. Can be LONG, FLOAT, DOUBLE, or STRING.</td><td>no, default is FLOAT</td></tr>
+</tbody>
+</table>
+</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/0.20.0/querying/sorting-orders.html"><span class="arrow-prev">← </span><span>String comparators</span></a><a class="docs-next button" href="/docs/0.20.0/development/geo.html"><span>Spatial filters</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#virtual-column-types">Virtual column types</a><ul class="toc-headings"><li><a href="#expression-virtual-column">Expression virtual column</a></li></ul></li></ul></nav></div><footer class="nav-footer druid-footer" id="footer"><div class="container"><div class="text-center"><p><a href="/technology">Technology</a> · <a href="/use-cases">Use Cases</a> · <a href="/druid-powered">Powered by Druid</a> · <a href="/docs/0.20.0/latest">Docs</a> · <a href="/community/">Community</a> · <a href="/downloads.html">Download</a> · <a href="/faq">FAQ</a></p></div><div class="text-center"><a title="Join the user group" href="https://groups.google.com/forum/#!forum/druid-user" target="_blank"><span class="fa fa-comments"></span></a> · <a title="Follow Druid" href="https://twitter.com/druidio" target="_blank"><span class="fab fa-twitter"></span></a> · <a title="Download via Apache" href="https://www.apache.org/dyn/closer.cgi?path=/incubator/druid/{{ site.druid_versions[0].versions[0].version }}/apache-druid-{{ site.druid_versions[0].versions[0].version }}-bin.tar.gz" target="_blank"><span class="fas fa-feather"></span></a> · <a title="GitHub" href="https://github.com/apache/druid" target="_blank"><span class="fab fa-github"></span></a></div><div class="text-center license">Copyright © 2019 <a href="https://www.apache.org/" target="_blank">Apache Software Foundation</a>.<br/>Except where otherwise noted, licensed under <a rel="license" href="http://creativecommons.org/licenses/by-sa/4.0/">CC BY-SA 4.0</a>.<br/>Apache Druid, Druid, and the Druid logo are either registered trademarks or trademarks of The Apache Software Foundation in the United States and other countries.</div></div></footer></div><script type="text/javascript" src="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.js"></script><script>
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diff --git a/docs/0.20.0/tutorials/booting-a-production-cluster.html b/docs/0.20.0/tutorials/booting-a-production-cluster.html
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+++ b/docs/0.20.0/tutorials/booting-a-production-cluster.html
@@ -0,0 +1,8 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>Redirecting...</title>
+<link rel="canonical" href="cluster.html">
+<meta http-equiv="refresh" content="0; url=cluster.html">
+<h1>Redirecting...</h1>
+<a href="cluster.html">Click here if you are not redirected.</a>
+<script>location="cluster.html"</script>
diff --git a/docs/0.20.0/tutorials/cluster.html b/docs/0.20.0/tutorials/cluster.html
new file mode 100644
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+++ b/docs/0.20.0/tutorials/cluster.html
@@ -0,0 +1,415 @@
+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Clustered deployment · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/0.20.0/tutorials/cluster.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.20.0" /><meta property="og:title" content="Clustered deployment · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
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+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
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+<p>Apache Druid is designed to be deployed as a scalable, fault-tolerant cluster.</p>
+<p>In this document, we'll set up a simple cluster and discuss how it can be further configured to meet
+your needs.</p>
+<p>This simple cluster will feature:</p>
+<ul>
+<li>A Master server to host the Coordinator and Overlord processes</li>
+<li>Two scalable, fault-tolerant Data servers running Historical and MiddleManager processes</li>
+<li>A query server, hosting the Druid Broker and Router processes</li>
+</ul>
+<p>In production, we recommend deploying multiple Master servers and multiple Query servers in a fault-tolerant configuration based on your specific fault-tolerance needs, but you can get started quickly with one Master and one Query server and add more servers later.</p>
+<h2><a class="anchor" aria-hidden="true" id="select-hardware"></a><a href="#select-hardware" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Select hardware</h2>
+<h3><a class="anchor" aria-hidden="true" id="fresh-deployment"></a><a href="#fresh-deployment" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Fresh Deployment</h3>
+<p>If you do not have an existing Druid cluster, and wish to start running Druid in a clustered deployment, this guide provides an example clustered deployment with pre-made configurations.</p>
+<h4><a class="anchor" aria-hidden="true" id="master-server"></a><a href="#master-server" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Master server</h4>
+<p>The Coordinator and Overlord processes are responsible for handling the metadata and coordination needs of your cluster. They can be colocated together on the same server.</p>
+<p>In this example, we will be deploying the equivalent of one AWS <a href="https://aws.amazon.com/ec2/instance-types/m5/">m5.2xlarge</a> instance.</p>
+<p>This hardware offers:</p>
+<ul>
+<li>8 vCPUs</li>
+<li>31 GB RAM</li>
+</ul>
+<p>Example Master server configurations that have been sized for this hardware can be found under <code>conf/druid/cluster/master</code>.</p>
+<h4><a class="anchor" aria-hidden="true" id="data-server"></a><a href="#data-server" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Data server</h4>
+<p>Historicals and MiddleManagers can be colocated on the same server to handle the actual data in your cluster. These servers benefit greatly from CPU, RAM,
+and SSDs.</p>
+<p>In this example, we will be deploying the equivalent of two AWS <a href="https://aws.amazon.com/ec2/instance-types/i3/">i3.4xlarge</a> instances.</p>
+<p>This hardware offers:</p>
+<ul>
+<li>16 vCPUs</li>
+<li>122 GB RAM</li>
+<li>2 * 1.9TB SSD storage</li>
+</ul>
+<p>Example Data server configurations that have been sized for this hardware can be found under <code>conf/druid/cluster/data</code>.</p>
+<h4><a class="anchor" aria-hidden="true" id="query-server"></a><a href="#query-server" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Query server</h4>
+<p>Druid Brokers accept queries and farm them out to the rest of the cluster. They also optionally maintain an
+in-memory query cache. These servers benefit greatly from CPU and RAM.</p>
+<p>In this example, we will be deploying the equivalent of one AWS <a href="https://aws.amazon.com/ec2/instance-types/m5/">m5.2xlarge</a> instance.</p>
+<p>This hardware offers:</p>
+<ul>
+<li>8 vCPUs</li>
+<li>31 GB RAM</li>
+</ul>
+<p>You can consider co-locating any open source UIs or query libraries on the same server that the Broker is running on.</p>
+<p>Example Query server configurations that have been sized for this hardware can be found under <code>conf/druid/cluster/query</code>.</p>
+<h4><a class="anchor" aria-hidden="true" id="other-hardware-sizes"></a><a href="#other-hardware-sizes" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Other Hardware Sizes</h4>
+<p>The example cluster above is chosen as a single example out of many possible ways to size a Druid cluster.</p>
+<p>You can choose smaller/larger hardware or less/more servers for your specific needs and constraints.</p>
+<p>If your use case has complex scaling requirements, you can also choose to not co-locate Druid processes (e.g., standalone Historical servers).</p>
+<p>The information in the <a href="/docs/0.20.0/operations/basic-cluster-tuning.html">basic cluster tuning guide</a> can help with your decision-making process and with sizing your configurations.</p>
+<h3><a class="anchor" aria-hidden="true" id="migrating-from-a-single-server-deployment"></a><a href="#migrating-from-a-single-server-deployment" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Migrating from a single-server deployment</h3>
+<p>If you have an existing single-server deployment, such as the ones from the <a href="/docs/0.20.0/operations/single-server.html">single-server deployment examples</a>, and you wish to migrate to a clustered deployment of similar scale, the following section contains guidelines for choosing equivalent hardware using the Master/Data/Query server organization.</p>
+<h4><a class="anchor" aria-hidden="true" id="master-server-1"></a><a href="#master-server-1" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Master server</h4>
+<p>The main considerations for the Master server are available CPUs and RAM for the Coordinator and Overlord heaps.</p>
+<p>Sum up the allocated heap sizes for your Coordinator and Overlord from the single-server deployment, and choose Master server hardware with enough RAM for the combined heaps, with some extra RAM for other processes on the machine.</p>
+<p>For CPU cores, you can choose hardware with approximately 1/4th of the cores of the single-server deployment.</p>
+<h4><a class="anchor" aria-hidden="true" id="data-server-1"></a><a href="#data-server-1" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Data server</h4>
+<p>When choosing Data server hardware for the cluster, the main considerations are available CPUs and RAM, and using SSD storage if feasible.</p>
+<p>In a clustered deployment, having multiple Data servers is a good idea for fault-tolerance purposes.</p>
+<p>When choosing the Data server hardware, you can choose a split factor <code>N</code>, divide the original CPU/RAM of the single-server deployment by <code>N</code>, and deploy <code>N</code> Data servers of reduced size in the new cluster.</p>
+<p>Instructions for adjusting the Historical/MiddleManager configs for the split are described in a later section in this guide.</p>
+<h4><a class="anchor" aria-hidden="true" id="query-server-1"></a><a href="#query-server-1" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Query server</h4>
+<p>The main considerations for the Query server are available CPUs and RAM for the Broker heap + direct memory, and Router heap.</p>
+<p>Sum up the allocated memory sizes for your Broker and Router from the single-server deployment, and choose Query server hardware with enough RAM to cover the Broker/Router, with some extra RAM for other processes on the machine.</p>
+<p>For CPU cores, you can choose hardware with approximately 1/4th of the cores of the single-server deployment.</p>
+<p>The <a href="/docs/0.20.0/operations/basic-cluster-tuning.html">basic cluster tuning guide</a> has information on how to calculate Broker/Router memory usage.</p>
+<h2><a class="anchor" aria-hidden="true" id="select-os"></a><a href="#select-os" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Select OS</h2>
+<p>We recommend running your favorite Linux distribution. You will also need:</p>
+<ul>
+<li><strong>Java 8 or later</strong></li>
+</ul>
+<blockquote>
+<p><strong>Warning:</strong> Druid only officially supports Java 8. Any Java version later than 8 is still experimental.</p>
+<p>If needed, you can specify where to find Java using the environment variables <code>DRUID_JAVA_HOME</code> or <code>JAVA_HOME</code>. For more details run the verify-java script.</p>
+</blockquote>
+<p>Your OS package manager should be able to help for both Java. If your Ubuntu-based OS
+does not have a recent enough version of Java, WebUpd8 offers <a href="http://www.webupd8.org/2012/09/install-oracle-java-8-in-ubuntu-via-ppa.html">packages for those
+OSes</a>.</p>
+<h2><a class="anchor" aria-hidden="true" id="download-the-distribution"></a><a href="#download-the-distribution" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Download the distribution</h2>
+<p>First, download and unpack the release archive. It's best to do this on a single machine at first,
+since you will be editing the configurations and then copying the modified distribution out to all
+of your servers.</p>
+<p><a href="https://www.apache.org/dyn/closer.cgi?path=/druid/0.20.0/apache-druid-0.20.0-bin.tar.gz">Download</a>
+the 0.20.0 release.</p>
+<p>Extract Druid by running the following commands in your terminal:</p>
+<pre><code class="hljs css language-bash">tar -xzf apache-druid-0.20.0-bin.tar.gz
+<span class="hljs-built_in">cd</span> apache-druid-0.20.0
+</code></pre>
+<p>In the package, you should find:</p>
+<ul>
+<li><code>LICENSE</code> and <code>NOTICE</code> files</li>
+<li><code>bin/*</code> - scripts related to the <a href="index.html">single-machine quickstart</a></li>
+<li><code>conf/druid/cluster/*</code> - template configurations for a clustered setup</li>
+<li><code>extensions/*</code> - core Druid extensions</li>
+<li><code>hadoop-dependencies/*</code> - Druid Hadoop dependencies</li>
+<li><code>lib/*</code> - libraries and dependencies for core Druid</li>
+<li><code>quickstart/*</code> - files related to the <a href="index.html">single-machine quickstart</a></li>
+</ul>
+<p>We'll be editing the files in <code>conf/druid/cluster/</code> in order to get things running.</p>
+<h3><a class="anchor" aria-hidden="true" id="migrating-from-single-server-deployments"></a><a href="#migrating-from-single-server-deployments" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Migrating from Single-Server Deployments</h3>
+<p>In the following sections we will be editing the configs under <code>conf/druid/cluster</code>.</p>
+<p>If you have an existing single-server deployment, please copy your existing configs to <code>conf/druid/cluster</code> to preserve any config changes you have made.</p>
+<h2><a class="anchor" aria-hidden="true" id="configure-metadata-storage-and-deep-storage"></a><a href="#configure-metadata-storage-and-deep-storage" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Configure metadata storage and deep storage</h2>
+<h3><a class="anchor" aria-hidden="true" id="migrating-from-single-server-deployments-1"></a><a href="#migrating-from-single-server-deployments-1" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Migrating from Single-Server Deployments</h3>
+<p>If you have an existing single-server deployment and you wish to preserve your data across the migration, please follow the instructions at <a href="/docs/0.20.0/operations/metadata-migration.html">metadata migration</a> and <a href="/docs/0.20.0/operations/deep-storage-migration.html">deep storage migration</a> before updating your metadata/deep storage configs.</p>
+<p>These guides are targeted at single-server deployments that use the Derby metadata store and local deep storage. If you are already using a non-Derby metadata store in your single-server cluster, you can reuse the existing metadata store for the new cluster.</p>
+<p>These guides also provide information on migrating segments from local deep storage. A clustered deployment requires distributed deep storage like S3 or HDFS. If your single-server deployment was already using distributed deep storage, you can reuse the existing deep storage for the new cluster.</p>
+<h3><a class="anchor" aria-hidden="true" id="metadata-storage"></a><a href="#metadata-storage" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Metadata storage</h3>
+<p>In <code>conf/druid/cluster/_common/common.runtime.properties</code>, replace
+&quot;metadata.storage.*&quot; with the address of the machine that you will use as your metadata store:</p>
+<ul>
+<li><code>druid.metadata.storage.connector.connectURI</code></li>
+<li><code>druid.metadata.storage.connector.host</code></li>
+</ul>
+<p>In a production deployment, we recommend running a dedicated metadata store such as MySQL or PostgreSQL with replication, deployed separately from the Druid servers.</p>
+<p>The <a href="/docs/0.20.0/development/extensions-core/mysql.html">MySQL extension</a> and <a href="/docs/0.20.0/development/extensions-core/postgresql.html">PostgreSQL extension</a> docs have instructions for extension configuration and initial database setup.</p>
+<h3><a class="anchor" aria-hidden="true" id="deep-storage"></a><a href="#deep-storage" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Deep storage</h3>
+<p>Druid relies on a distributed filesystem or large object (blob) store for data storage. The most
+commonly used deep storage implementations are S3 (popular for those on AWS) and HDFS (popular if
+you already have a Hadoop deployment).</p>
+<h4><a class="anchor" aria-hidden="true" id="s3"></a><a href="#s3" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>S3</h4>
+<p>In <code>conf/druid/cluster/_common/common.runtime.properties</code>,</p>
+<ul>
+<li><p>Add &quot;druid-s3-extensions&quot; to <code>druid.extensions.loadList</code>.</p></li>
+<li><p>Comment out the configurations for local storage under &quot;Deep Storage&quot; and &quot;Indexing service logs&quot;.</p></li>
+<li><p>Uncomment and configure appropriate values in the &quot;For S3&quot; sections of &quot;Deep Storage&quot; and
+&quot;Indexing service logs&quot;.</p></li>
+</ul>
+<p>After this, you should have made the following changes:</p>
+<pre><code class="hljs"><span class="hljs-attr">druid.extensions.loadList</span>=[<span class="hljs-string">"druid-s3-extensions"</span>]
+
+<span class="hljs-comment">#druid.storage.type=local</span>
+<span class="hljs-comment">#druid.storage.storageDirectory=var/druid/segments</span>
+
+<span class="hljs-attr">druid.storage.type</span>=s3
+<span class="hljs-attr">druid.storage.bucket</span>=your-bucket
+<span class="hljs-attr">druid.storage.baseKey</span>=druid/segments
+<span class="hljs-attr">druid.s3.accessKey</span>=...
+<span class="hljs-attr">druid.s3.secretKey</span>=...
+
+<span class="hljs-comment">#druid.indexer.logs.type=file</span>
+<span class="hljs-comment">#druid.indexer.logs.directory=var/druid/indexing-logs</span>
+
+<span class="hljs-attr">druid.indexer.logs.type</span>=s3
+<span class="hljs-attr">druid.indexer.logs.s3Bucket</span>=your-bucket
+<span class="hljs-attr">druid.indexer.logs.s3Prefix</span>=druid/indexing-logs
+</code></pre>
+<p>Please see the <a href="/docs/0.20.0/development/extensions-core/s3.html">S3 extension</a> documentation for more info.</p>
+<h4><a class="anchor" aria-hidden="true" id="hdfs"></a><a href="#hdfs" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>HDFS</h4>
+<p>In <code>conf/druid/cluster/_common/common.runtime.properties</code>,</p>
+<ul>
+<li><p>Add &quot;druid-hdfs-storage&quot; to <code>druid.extensions.loadList</code>.</p></li>
+<li><p>Comment out the configurations for local storage under &quot;Deep Storage&quot; and &quot;Indexing service logs&quot;.</p></li>
+<li><p>Uncomment and configure appropriate values in the &quot;For HDFS&quot; sections of &quot;Deep Storage&quot; and
+&quot;Indexing service logs&quot;.</p></li>
+</ul>
+<p>After this, you should have made the following changes:</p>
+<pre><code class="hljs">druid<span class="hljs-selector-class">.extensions</span>.loadList=[<span class="hljs-string">"druid-hdfs-storage"</span>]
+
+<span class="hljs-selector-id">#druid</span><span class="hljs-selector-class">.storage</span>.type=local
+<span class="hljs-selector-id">#druid</span><span class="hljs-selector-class">.storage</span>.storageDirectory=var/druid/segments
+
+druid<span class="hljs-selector-class">.storage</span>.type=hdfs
+druid<span class="hljs-selector-class">.storage</span>.storageDirectory=/druid/segments
+
+<span class="hljs-selector-id">#druid</span><span class="hljs-selector-class">.indexer</span><span class="hljs-selector-class">.logs</span>.type=file
+<span class="hljs-selector-id">#druid</span><span class="hljs-selector-class">.indexer</span><span class="hljs-selector-class">.logs</span>.directory=var/druid/indexing-logs
+
+druid<span class="hljs-selector-class">.indexer</span><span class="hljs-selector-class">.logs</span>.type=hdfs
+druid<span class="hljs-selector-class">.indexer</span><span class="hljs-selector-class">.logs</span>.directory=/druid/indexing-logs
+</code></pre>
+<p>Also,</p>
+<ul>
+<li>Place your Hadoop configuration XMLs (core-site.xml, hdfs-site.xml, yarn-site.xml,
+mapred-site.xml) on the classpath of your Druid processes. You can do this by copying them into
+<code>conf/druid/cluster/_common/</code>.</li>
+</ul>
+<p>Please see the <a href="/docs/0.20.0/development/extensions-core/hdfs.html">HDFS extension</a> documentation for more info.</p>
+<p><a name="hadoop"></a></p>
+<h2><a class="anchor" aria-hidden="true" id="configure-for-connecting-to-hadoop-optional"></a><a href="#configure-for-connecting-to-hadoop-optional" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Configure for connecting to Hadoop (optional)</h2>
+<p>If you will be loading data from a Hadoop cluster, then at this point you should configure Druid to be aware
+of your cluster:</p>
+<ul>
+<li><p>Update <code>druid.indexer.task.hadoopWorkingPath</code> in <code>conf/druid/cluster/middleManager/runtime.properties</code> to
+a path on HDFS that you'd like to use for temporary files required during the indexing process.
+<code>druid.indexer.task.hadoopWorkingPath=/tmp/druid-indexing</code> is a common choice.</p></li>
+<li><p>Place your Hadoop configuration XMLs (core-site.xml, hdfs-site.xml, yarn-site.xml,
+mapred-site.xml) on the classpath of your Druid processes. You can do this by copying them into
+<code>conf/druid/cluster/_common/core-site.xml</code>, <code>conf/druid/cluster/_common/hdfs-site.xml</code>, and so on.</p></li>
+</ul>
+<p>Note that you don't need to use HDFS deep storage in order to load data from Hadoop. For example, if
+your cluster is running on Amazon Web Services, we recommend using S3 for deep storage even if you
+are loading data using Hadoop or Elastic MapReduce.</p>
+<p>For more info, please see the <a href="/docs/0.20.0/ingestion/hadoop.html">Hadoop-based ingestion</a> page.</p>
+<h2><a class="anchor" aria-hidden="true" id="configure-zookeeper-connection"></a><a href="#configure-zookeeper-connection" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Configure Zookeeper connection</h2>
+<p>In a production cluster, we recommend using a dedicated ZK cluster in a quorum, deployed separately from the Druid servers.</p>
+<p>In <code>conf/druid/cluster/_common/common.runtime.properties</code>, set
+<code>druid.zk.service.host</code> to a <a href="https://zookeeper.apache.org/doc/current/zookeeperProgrammers.html">connection string</a>
+containing a comma separated list of host:port pairs, each corresponding to a ZooKeeper server in your ZK quorum.
+(e.g. &quot;127.0.0.1:4545&quot; or &quot;127.0.0.1:3000,127.0.0.1:3001,127.0.0.1:3002&quot;)</p>
+<p>You can also choose to run ZK on the Master servers instead of having a dedicated ZK cluster. If doing so, we recommend deploying 3 Master servers so that you have a ZK quorum.</p>
+<h2><a class="anchor" aria-hidden="true" id="configuration-tuning"></a><a href="#configuration-tuning" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Configuration Tuning</h2>
+<h3><a class="anchor" aria-hidden="true" id="migrating-from-a-single-server-deployment-1"></a><a href="#migrating-from-a-single-server-deployment-1" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Migrating from a Single-Server Deployment</h3>
+<h4><a class="anchor" aria-hidden="true" id="master"></a><a href="#master" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Master</h4>
+<p>If you are using an example configuration from <a href="/docs/0.20.0/operations/single-server.html">single-server deployment examples</a>, these examples combine the Coordinator and Overlord processes into one combined process.</p>
+<p>The example configs under <code>conf/druid/cluster/master/coordinator-overlord</code> also combine the Coordinator and Overlord processes.</p>
+<p>You can copy your existing <code>coordinator-overlord</code> configs from the single-server deployment to <code>conf/druid/cluster/master/coordinator-overlord</code>.</p>
+<h4><a class="anchor" aria-hidden="true" id="data"></a><a href="#data" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Data</h4>
+<p>Suppose we are migrating from a single-server deployment that had 32 CPU and 256GB RAM. In the old deployment, the following configurations for Historicals and MiddleManagers were applied:</p>
+<p>Historical (Single-server)</p>
+<pre><code class="hljs"><span class="hljs-attr">druid.processing.buffer.sizeBytes</span>=<span class="hljs-number">500000000</span>
+<span class="hljs-attr">druid.processing.numMergeBuffers</span>=<span class="hljs-number">8</span>
+<span class="hljs-attr">druid.processing.numThreads</span>=<span class="hljs-number">31</span>
+</code></pre>
+<p>MiddleManager (Single-server)</p>
+<pre><code class="hljs">druid<span class="hljs-selector-class">.worker</span>.capacity=<span class="hljs-number">8</span>
+druid<span class="hljs-selector-class">.indexer</span><span class="hljs-selector-class">.fork</span><span class="hljs-selector-class">.property</span><span class="hljs-selector-class">.druid</span><span class="hljs-selector-class">.processing</span>.numMergeBuffers=<span class="hljs-number">2</span>
+druid<span class="hljs-selector-class">.indexer</span><span class="hljs-selector-class">.fork</span><span class="hljs-selector-class">.property</span><span class="hljs-selector-class">.druid</span><span class="hljs-selector-class">.processing</span><span class="hljs-selector-class">.buffer</span>.sizeBytes=<span class="hljs-number">100000000</span>
+druid<span class="hljs-selector-class">.indexer</span><span class="hljs-selector-class">.fork</span><span class="hljs-selector-class">.property</span><span class="hljs-selector-class">.druid</span><span class="hljs-selector-class">.processing</span>.numThreads=<span class="hljs-number">1</span>
+</code></pre>
+<p>In the clustered deployment, we can choose a split factor (2 in this example), and deploy 2 Data servers with 16CPU and 128GB RAM each. The areas to scale are the following:</p>
+<p>Historical</p>
+<ul>
+<li><code>druid.processing.numThreads</code>: Set to <code>(num_cores - 1)</code> based on the new hardware</li>
+<li><code>druid.processing.numMergeBuffers</code>: Divide the old value from the single-server deployment by the split factor</li>
+<li><code>druid.processing.buffer.sizeBytes</code>: Keep this unchanged</li>
+</ul>
+<p>MiddleManager:</p>
+<ul>
+<li><code>druid.worker.capacity</code>: Divide the old value from the single-server deployment by the split factor</li>
+<li><code>druid.indexer.fork.property.druid.processing.numMergeBuffers</code>: Keep this unchanged</li>
+<li><code>druid.indexer.fork.property.druid.processing.buffer.sizeBytes</code>: Keep this unchanged</li>
+<li><code>druid.indexer.fork.property.druid.processing.numThreads</code>: Keep this unchanged</li>
+</ul>
+<p>The resulting configs after the split:</p>
+<p>New Historical (on 2 Data servers)</p>
+<pre><code class="hljs"> druid.processing.buffer.<span class="hljs-attribute">sizeBytes</span>=500000000
+ druid.processing.<span class="hljs-attribute">numMergeBuffers</span>=8
+ druid.processing.<span class="hljs-attribute">numThreads</span>=31
+</code></pre>
+<p>New MiddleManager (on 2 Data servers)</p>
+<pre><code class="hljs">druid<span class="hljs-selector-class">.worker</span>.capacity=<span class="hljs-number">4</span>
+druid<span class="hljs-selector-class">.indexer</span><span class="hljs-selector-class">.fork</span><span class="hljs-selector-class">.property</span><span class="hljs-selector-class">.druid</span><span class="hljs-selector-class">.processing</span>.numMergeBuffers=<span class="hljs-number">2</span>
+druid<span class="hljs-selector-class">.indexer</span><span class="hljs-selector-class">.fork</span><span class="hljs-selector-class">.property</span><span class="hljs-selector-class">.druid</span><span class="hljs-selector-class">.processing</span><span class="hljs-selector-class">.buffer</span>.sizeBytes=<span class="hljs-number">100000000</span>
+druid<span class="hljs-selector-class">.indexer</span><span class="hljs-selector-class">.fork</span><span class="hljs-selector-class">.property</span><span class="hljs-selector-class">.druid</span><span class="hljs-selector-class">.processing</span>.numThreads=<span class="hljs-number">1</span>
+</code></pre>
+<h4><a class="anchor" aria-hidden="true" id="query"></a><a href="#query" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Query</h4>
+<p>You can copy your existing Broker and Router configs to the directories under <code>conf/druid/cluster/query</code>, no modifications are needed, as long as the new hardware is sized accordingly.</p>
+<h3><a class="anchor" aria-hidden="true" id="fresh-deployment-1"></a><a href="#fresh-deployment-1" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Fresh deployment</h3>
+<p>If you are using the example cluster described above:</p>
+<ul>
+<li>1 Master server (m5.2xlarge)</li>
+<li>2 Data servers (i3.4xlarge)</li>
+<li>1 Query server (m5.2xlarge)</li>
+</ul>
+<p>The configurations under <code>conf/druid/cluster</code> have already been sized for this hardware and you do not need to make further modifications for general use cases.</p>
+<p>If you have chosen different hardware, the <a href="/docs/0.20.0/operations/basic-cluster-tuning.html">basic cluster tuning guide</a> can help you size your configurations.</p>
+<h2><a class="anchor" aria-hidden="true" id="open-ports-if-using-a-firewall"></a><a href="#open-ports-if-using-a-firewall" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Open ports (if using a firewall)</h2>
+<p>If you're using a firewall or some other system that only allows traffic on specific ports, allow
+inbound connections on the following:</p>
+<h3><a class="anchor" aria-hidden="true" id="master-server-2"></a><a href="#master-server-2" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Master Server</h3>
+<ul>
+<li>1527 (Derby metadata store; not needed if you are using a separate metadata store like MySQL or PostgreSQL)</li>
+<li>2181 (ZooKeeper; not needed if you are using a separate ZooKeeper cluster)</li>
+<li>8081 (Coordinator)</li>
+<li>8090 (Overlord)</li>
+</ul>
+<h3><a class="anchor" aria-hidden="true" id="data-server-2"></a><a href="#data-server-2" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Data Server</h3>
+<ul>
+<li>8083 (Historical)</li>
+<li>8091, 8100–8199 (Druid Middle Manager; you may need higher than port 8199 if you have a very high <code>druid.worker.capacity</code>)</li>
+</ul>
+<h3><a class="anchor" aria-hidden="true" id="query-server-2"></a><a href="#query-server-2" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Query Server</h3>
+<ul>
+<li>8082 (Broker)</li>
+<li>8088 (Router, if used)</li>
+</ul>
+<blockquote>
+<p>In production, we recommend deploying ZooKeeper and your metadata store on their own dedicated hardware,
+rather than on the Master server.</p>
+</blockquote>
+<h2><a class="anchor" aria-hidden="true" id="start-master-server"></a><a href="#start-master-server" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Start Master Server</h2>
+<p>Copy the Druid distribution and your edited configurations to your Master server.</p>
+<p>If you have been editing the configurations on your local machine, you can use <em>rsync</em> to copy them:</p>
+<pre><code class="hljs css language-bash">rsync -az apache-druid-0.20.0/ MASTER_SERVER:apache-druid-0.20.0/
+</code></pre>
+<h3><a class="anchor" aria-hidden="true" id="no-zookeeper-on-master"></a><a href="#no-zookeeper-on-master" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>No Zookeeper on Master</h3>
+<p>From the distribution root, run the following command to start the Master server:</p>
+<pre><code class="hljs">bin/<span class="hljs-keyword">start</span>-<span class="hljs-keyword">cluster</span>-master-<span class="hljs-keyword">no</span>-zk-<span class="hljs-keyword">server</span>
+</code></pre>
+<h3><a class="anchor" aria-hidden="true" id="with-zookeeper-on-master"></a><a href="#with-zookeeper-on-master" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>With Zookeeper on Master</h3>
+<p>If you plan to run ZK on Master servers, first update <code>conf/zoo.cfg</code> to reflect how you plan to run ZK. Then, you
+can start the Master server processes together with ZK using:</p>
+<pre><code class="hljs">bin/<span class="hljs-keyword">start</span>-<span class="hljs-keyword">cluster</span>-master-<span class="hljs-keyword">with</span>-zk-<span class="hljs-keyword">server</span>
+</code></pre>
+<blockquote>
+<p>In production, we also recommend running a ZooKeeper cluster on its own dedicated hardware.</p>
+</blockquote>
+<h2><a class="anchor" aria-hidden="true" id="start-data-server"></a><a href="#start-data-server" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Start Data Server</h2>
+<p>Copy the Druid distribution and your edited configurations to your Data servers.</p>
+<p>From the distribution root, run the following command to start the Data server:</p>
+<pre><code class="hljs">bin/<span class="hljs-keyword">start</span>-<span class="hljs-keyword">cluster</span>-data-<span class="hljs-keyword">server</span>
+</code></pre>
+<p>You can add more Data servers as needed.</p>
+<blockquote>
+<p>For clusters with complex resource allocation needs, you can break apart Historicals and MiddleManagers and scale the components individually.
+This also allows you take advantage of Druid's built-in MiddleManager autoscaling facility.</p>
+</blockquote>
+<h2><a class="anchor" aria-hidden="true" id="start-query-server"></a><a href="#start-query-server" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Start Query Server</h2>
+<p>Copy the Druid distribution and your edited configurations to your Query servers.</p>
+<p>From the distribution root, run the following command to start the Query server:</p>
+<pre><code class="hljs">bin/<span class="hljs-keyword">start</span>-<span class="hljs-keyword">cluster</span>-query-<span class="hljs-keyword">server</span>
+</code></pre>
+<p>You can add more Query servers as needed based on query load. If you increase the number of Query servers, be sure to adjust the connection pools on your Historicals and Tasks as described in the <a href="/docs/0.20.0/operations/basic-cluster-tuning.html">basic cluster tuning guide</a>.</p>
+<h2><a class="anchor" aria-hidden="true" id="loading-data"></a><a href="#loading-data" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Loading data</h2>
+<p>Congratulations, you now have a Druid cluster! The next step is to learn about recommended ways to load data into
+Druid based on your use case. Read more about <a href="/docs/0.20.0/ingestion/index.html">loading data</a>.</p>
+</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/0.20.0/operations/single-server.html"><span class="arrow-prev">← </span><span>Single server deployment</span></a><a class="docs-next button" href="/docs/0.20.0/tutorials/tutorial-batch.html"><span>Loading files natively</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#select-hardware">Select hardware</a><ul class="toc-headings"><li><a href="#fresh-deployment">Fresh Deployment</a></li><li><a href="#migrating-from-a-single-server-deployment">Migrating from a single-server deployment</a></li></ul></li><li><a href="#select-os">Select OS</a></li><li><a href="#download-the-distribution">Download the distribution</a><ul class="toc-headings"><li><a href="#migrating-from-single-server-deployments">Migrating from Single-Server Deployments</a></li></ul></li><li><a href="#configure-metadata-storage-and-deep-storage">Configure metadata storage and deep storage</a><ul class="toc-headings"><li><a href="#migrating-from-single-server-deployments-1">Migrating from Single-Server Deployments</a></li><li><a href="#metadata-storage">Metadata storage</a></li><li><a href="#deep-storage">Deep storage</a></li></ul></li><li><a href="#configure-for-connecting-to-hadoop-optional">Configure for connecting to Hadoop (optional)</a></li><li><a href="#configure-zookeeper-connection">Configure Zookeeper connection</a></li><li><a href="#configuration-tuning">Configuration Tuning</a><ul class="toc-headings"><li><a href="#migrating-from-a-single-server-deployment-1">Migrating from a Single-Server Deployment</a></li><li><a href="#fresh-deployment-1">Fresh deployment</a></li></ul></li><li><a href="#open-ports-if-using-a-firewall">Open ports (if using a firewall)</a><ul class="toc-headings"><li><a href="#master-server-2">Master Server</a></li><li><a href="#data-server-2">Data Server</a></li><li><a href="#query-server-2">Query Server</a></li></ul></li><li><a href="#start-master-server">Start Master Server</a><ul class="toc-headings"><li><a href="#no-zookeeper-on-master">No Zookeeper on Master</a></li><li><a href="#with-zookeeper-on-master">With Zookeeper on Master</a></li></ul></li><li><a href="#start-data-server">Start Data Server</a></li><li><a href="#start-query-server">Start Query Server</a></li><li><a href="#loading-data">Loading data</a></li></ul></nav></div><footer class="nav-footer druid-footer" id="footer"><div class="container"><div class="text-center"><p><a href="/technology">Technology</a> · <a href="/use-cases">Use Cases</a> · <a href="/druid-powered">Powered by Druid</a> · <a href="/docs/0.20.0/latest">Docs</a> · <a href="/community/">Community</a> · <a href="/downloads.html">Download</a> · <a href="/faq">FAQ</a></p></div><div class="text-center"><a title="Join the user group" href="https://groups.google.com/forum/#!forum/druid-user" target="_blank"><span class="fa fa-comments"></span></a> · <a title="Follow Druid" href="https://twitter.com/druidio" target="_blank"><span class="fab fa-twitter"></span></a> · <a title="Download via Apache" href="https://www.apache.org/dyn/closer.cgi?path=/incubator/druid/{{ site.druid_versions[0].versions[0].version }}/apache-druid-{{ site.druid_versions[0].versions[0].version }}-bin.tar.gz" target="_blank"><span class="fas fa-feather"></span></a> · <a title="GitHub" href="https://github.com/apache/druid" target="_blank"><span class="fab fa-github"></span></a></div><div class="text-center license">Copyright © 2019 <a href="https://www.apache.org/" target="_blank">Apache Software Foundation</a>.<br/>Except where otherwise noted, licensed under <a rel="license" href="http://creativecommons.org/licenses/by-sa/4.0/">CC BY-SA 4.0</a>.<br/>Apache Druid, Druid, and the Druid logo are either registered trademarks or trademarks of The Apache Software Foundation in the United States and other countries.</div></div></footer></div><script type="text/javascript" src="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.js"></script><script>
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+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Docker · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/0.20.0/tutorials/docker.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.20.0" /><meta property="og:title" content="Docker · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
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UIs</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/operations/deep-storage-migration.html">Deep storage migration</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/operations/export-metadata.html">Export Metadata Tool</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/operations/metadata-migration.html">Metadata Migration</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/operations/segment-optimization.html">Segment Size Optimization</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/operations/use_sbt_to_build_fat_jar.html">Content for build.sbt</a></li></ul></div></ul></div><div class="navGroup"><h3 class="navGroupCategoryTitle collapsible">Development<span class="arrow"><svg width="24" height="24" viewBox="0 0 24 24"><path fill="#565656" d="M7.41 15.41L12 10.83l4.59 4.58L18 14l-6-6-6 6z"></path><path d="M0 0h24v24H0z" fill="none"></path></svg></span></h3><ul class="hide"><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/overview.html">Developing on Druid</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/modules.html">Creating extensions</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/javascript.html">JavaScript functionality</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/build.html">Build from source</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/versioning.html">Versioning</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/experimental.html">Experimental features</a></li></ul></div><div class="navGroup"><h3 class="navGroupCategoryTitle collapsible">Misc<span class="arrow"><svg width="24" height="24" viewBox="0 0 24 24"><path fill="#565656" d="M7.41 15.41L12 10.83l4.59 4.58L18 14l-6-6-6 6z"></path><path d="M0 0h24v24H0z" fill="none"></path></svg></span></h3><ul class="hide"><li class="navListItem"><a class="navItem" href="/docs/0.20.0/misc/papers-and-talks.html">Papers</a></li></ul></div><div class="navGroup"><h3 class="navGroupCategoryTitle collapsible">Hidden<span class="arrow"><svg width="24" height="24" viewBox="0 0 24 24"><path fill="#565656" d="M7.41 15.41L12 10.83l4.59 4.58L18 14l-6-6-6 6z"></path><path d="M0 0h24v24H0z" fill="none"></path></svg></span></h3><ul class="hide"><li class="navListItem"><a class="navItem" href="/docs/0.20.0/comparisons/druid-vs-elasticsearch.html">Apache Druid vs Elasticsearch</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/comparisons/druid-vs-key-value.html">Apache Druid vs. Key/Value Stores (HBase/Cassandra/OpenTSDB)</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/comparisons/druid-vs-kudu.html">Apache Druid vs Kudu</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/comparisons/druid-vs-redshift.html">Apache Druid vs Redshift</a></li><li 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+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
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+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
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+  -->
+<p>In this quickstart, we will download the Apache Druid image from <a href="https://hub.docker.com/r/apache/druid">Docker Hub</a> and set it up on a single machine using <a href="https://www.docker.com/get-started">Docker</a> and <a href="https://docs.docker.com/compose/">Docker Compose</a>. The cluster will be ready to load data after completing this initial setup.</p>
+<p>Before beginning the quickstart, it is helpful to read the <a href="/docs/0.20.0/design/index.html">general Druid overview</a> and the <a href="/docs/0.20.0/ingestion/index.html">ingestion overview</a>, as the tutorials will refer to concepts discussed on those pages. Additionally, familiarity with Docker is recommended.</p>
+<h2><a class="anchor" aria-hidden="true" id="prerequisites"></a><a href="#prerequisites" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Prerequisites</h2>
+<ul>
+<li>Docker</li>
+</ul>
+<h2><a class="anchor" aria-hidden="true" id="getting-started"></a><a href="#getting-started" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Getting started</h2>
+<p>The Druid source code contains <a href="https://github.com/apache/druid/blob/master/distribution/docker/docker-compose.yml">an example <code>docker-compose.yml</code></a> which can pull an image from Docker Hub and is suited to be used as an example environment and to experiment with Docker based Druid configuration and deployments.</p>
+<h3><a class="anchor" aria-hidden="true" id="compose-file"></a><a href="#compose-file" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Compose file</h3>
+<p>The example <code>docker-compose.yml</code> will create a container for each Druid service, as well as Zookeeper and a PostgreSQL container as the metadata store. Deep storage will be a local directory, by default configured as <code>./storage</code> relative to your <code>docker-compose.yml</code> file, and will be mounted as <code>/opt/data</code> and shared between Druid containers which require access to deep storage. The Druid containers are configured via an <a href="https://github.com/apache/druid/blob/master/distribution/docker/environment">environment file</a>.</p>
+<h3><a class="anchor" aria-hidden="true" id="configuration"></a><a href="#configuration" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Configuration</h3>
+<p>Configuration of the Druid Docker container is done via environment variables, which may additionally specify paths to <a href="/docs/0.20.0/configuration/index.html">the standard Druid configuration files</a></p>
+<p>Special environment variables:</p>
+<ul>
+<li><code>JAVA_OPTS</code> -- set java options</li>
+<li><code>DRUID_LOG4J</code> -- set the entire <code>log4j.xml</code> verbatim</li>
+<li><code>DRUID_LOG_LEVEL</code> -- override the default log level in default log4j</li>
+<li><code>DRUID_XMX</code> -- set Java <code>Xmx</code></li>
+<li><code>DRUID_XMS</code> -- set Java <code>Xms</code></li>
+<li><code>DRUID_MAXNEWSIZE</code> -- set Java max new size</li>
+<li><code>DRUID_NEWSIZE</code> -- set Java new size</li>
+<li><code>DRUID_MAXDIRECTMEMORYSIZE</code> -- set Java max direct memory size</li>
+<li><code>DRUID_CONFIG_COMMON</code> -- full path to a file for druid 'common' properties</li>
+<li><code>DRUID_CONFIG_${service}</code> -- full path to a file for druid 'service' properties</li>
+</ul>
+<p>In addition to the special environment variables, the script which launches Druid in the container will also attempt to use any environment variable starting with the <code>druid_</code> prefix as a command-line configuration. For example, an environment variable</p>
+<p><code>druid_metadata_storage_type=postgresql</code></p>
+<p>would be translated into</p>
+<p><code>-Ddruid.metadata.storage.type=postgresql</code></p>
+<p>for the Druid process in the container.</p>
+<p>The Druid <code>docker-compose.yml</code> example utilizes a single environment file to specify the complete Druid configuration; however, in production use cases we suggest using either <code>DRUID_COMMON_CONFIG</code> and <code>DRUID_CONFIG_${service}</code> or specially tailored, service-specific environment files.</p>
+<h2><a class="anchor" aria-hidden="true" id="launching-the-cluster"></a><a href="#launching-the-cluster" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Launching the cluster</h2>
+<p>Run <code>docker-compose up</code> to launch the cluster with a shell attached, or <code>docker-compose up -d</code> to run the cluster in the background. If using the example files directly, this command should be run from <code>distribution/docker/</code> in your Druid installation directory.</p>
+<p>Once the cluster has started, you can navigate to <a href="http://localhost:8888">http://localhost:8888</a>.
+The <a href="/docs/0.20.0/design/router.html">Druid router process</a>, which serves the <a href="/docs/0.20.0/operations/druid-console.html">Druid console</a>, resides at this address.</p>
+<p><img src="../assets/tutorial-quickstart-01.png" alt="Druid console" title="Druid console"></p>
+<p>It takes a few seconds for all the Druid processes to fully start up. If you open the console immediately after starting the services, you may see some errors that you can safely ignore.</p>
+<p>From here you can follow along with the <a href="/docs/0.20.0/tutorials/index.html#step-4-load-data">Quickstart</a>, or elaborate on your <code>docker-compose.yml</code> to add any additional external service dependencies as necessary.</p>
+<h2><a class="anchor" aria-hidden="true" id="docker-memory-requirements"></a><a href="#docker-memory-requirements" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Docker Memory Requirements</h2>
+<p>If you experience any processes crashing with a 137 error code you likely don't have enough memory allocated to Docker. 6 GB may be a good place to start.</p>
+</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/0.20.0/tutorials/index.html"><span class="arrow-prev">← </span><span>Quickstart</span></a><a class="docs-next button" href="/docs/0.20.0/operations/single-server.html"><span>Single server deployment</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#prerequisites">Prerequisites</a></li><li><a href="#getting-started">Getting started</a><ul class="toc-headings"><li><a href="#compose-file">Compose file</a></li><li><a href="#configuration">Configuration</a></li></ul></li><li><a href="#launching-the-cluster">Launching the cluster</a></li><li><a href="#docker-memory-requirements">Docker Memory Requirements</a></li></ul></nav></div><footer class="nav-footer druid-footer" id="footer"><div class="container"><div class="text-center"><p><a href="/technology">Technology</a> · <a href="/use-cases">Use Cases</a> · <a href="/druid-powered">Powered by Druid</a> · <a href="/docs/0.20.0/latest">Docs</a> · <a href="/community/">Community</a> · <a href="/downloads.html">Download</a> · <a href="/faq">FAQ</a></p></div><div class="text-center"><a title="Join the user group" href="https://groups.google.com/forum/#!forum/druid-user" target="_blank"><span class="fa fa-comments"></span></a> · <a title="Follow Druid" href="https://twitter.com/druidio" target="_blank"><span class="fab fa-twitter"></span></a> · <a title="Download via Apache" href="https://www.apache.org/dyn/closer.cgi?path=/incubator/druid/{{ site.druid_versions[0].versions[0].version }}/apache-druid-{{ site.druid_versions[0].versions[0].version }}-bin.tar.gz" target="_blank"><span class="fas fa-feather"></span></a> · <a title="GitHub" href="https://github.com/apache/druid" target="_blank"><span class="fab fa-github"></span></a></div><div class="text-center license">Copyright © 2019 <a href="https://www.apache.org/" target="_blank">Apache Software Foundation</a>.<br/>Except where otherwise noted, licensed under <a rel="license" href="http://creativecommons.org/licenses/by-sa/4.0/">CC BY-SA 4.0</a>.<br/>Apache Druid, Druid, and the Druid logo are either registered trademarks or trademarks of The Apache Software Foundation in the United States and other countries.</div></div></footer></div><script type="text/javascript" src="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.js"></script><script>
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+<title>Redirecting...</title>
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+<script>location="index.html"</script>
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+<meta charset="utf-8">
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+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Quickstart · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/0.20.0/tutorials/index.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.20.0" /><meta property="og:title" content="Quickstart · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
+              window.dataLayer = window.dataLayer || [];
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+              gtag('js', new Date());
+              gtag('config', 'UA-131010415-1');
+            </script><link rel="stylesheet" href="https://use.fontawesome.com/releases/v5.7.2/css/all.css"/><link rel="stylesheet" href="/css/code-block-buttons.css"/><script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/clipboard.js/2.0.4/clipboard.min.js"></script><script type="text/javascript" src="/js/code-block-buttons.js"></script><script src="/js/scrollSpy.js"></script><link rel="stylesheet" href="/css/main.css"/><script src="/js/codetabs.js"></script></head><body class="sideNavVisible separateOnPageNav"><div class="fixedHeaderContainer"><div class="headerWrapper wrapper"><header><a href="/"><img class="logo" src="/img/druid_nav.png" alt="Apache Druid"/></a><div class="navigationWrapper navigationSlider"><nav class="slidingNav"><ul class="nav-site nav-site-internal"><li class=""><a href="/technology" target="_self">Technology</a></li><li class=""><a href="/use-cases" target="_self">Use Cases</a></li><li class=""><a href="/druid-powered" 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class="icon-toc"></i></div></div><div class="navGroups"><div class="navGroup"><h3 class="navGroupCategoryTitle collapsible">Getting started<span class="arrow"><svg width="24" height="24" viewBox="0 0 24 24"><path fill="#565656" d="M7.41 15.41L12 10.83l4.59 4.58L18 14l-6-6-6 6z"></path><path d="M0 0h24v24H0z" fill="none"></path></svg></span></h3><ul class="hide"><li class="navListItem"><a class="navItem" href="/docs/0.20.0/design/index.html">Introduction to Apache Druid</a></li><li class="navListItem navListItemActive"><a class="navItem" href="/docs/0.20.0/tutorials/index.html">Quickstart</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/tutorials/docker.html">Docker</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/operations/single-server.html">Single server deployment</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/tutorials/cluster.html">Clustered deployment</a></li></ul></div><div class="navGroup"><h3 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class="navListItem"><a class="navItem" href="/docs/0.20.0/querying/having.html">Having filters (groupBy)</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/querying/limitspec.html">Sorting and limiting (groupBy)</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/querying/topnmetricspec.html">Sorting (topN)</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/querying/sorting-orders.html">String comparators</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/querying/virtual-columns.html">Virtual columns</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/development/geo.html">Spatial filters</a></li></ul></div></ul></div><div class="navGroup"><h3 class="navGroupCategoryTitle collapsible">Configuration<span class="arrow"><svg width="24" height="24" viewBox="0 0 24 24"><path fill="#565656" d="M7.41 15.41L12 10.83l4.59 4.58L18 14l-6-6-6 6z"></path><path d="M0 0h24v24H0z" 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+  -->
+<p>This quickstart gets you started with Apache Druid and introduces you to some of its basic features.
+Following these steps, you will install Druid and load sample
+data using its native batch ingestion feature.</p>
+<p>Before starting, you may want to read the <a href="/docs/0.20.0/design/index.html">general Druid overview</a> and
+<a href="/docs/0.20.0/ingestion/index.html">ingestion overview</a>, as the tutorials refer to concepts discussed on those pages.</p>
+<h2><a class="anchor" aria-hidden="true" id="requirements"></a><a href="#requirements" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Requirements</h2>
+<p>You can follow these steps on a relatively small machine, such as a laptop with around 4 CPU and 16 GB of RAM.</p>
+<p>Druid comes with several startup configuration profiles for a range of machine sizes.
+The <code>micro-quickstart</code>configuration profile shown here is suitable for evaluating Druid. If you want to
+try out Druid's performance or scaling capabilities, you'll need a larger machine and configuration profile.</p>
+<p>The configuration profiles included with Druid range from the even smaller <em>Nano-Quickstart</em> configuration (1 CPU, 4GB RAM)
+to the <em>X-Large</em> configuration (64 CPU, 512GB RAM). For more information, see
+<a href="/docs/0.20.0/operations/single-server.html">Single server deployment</a>. Alternatively, see <a href="/docs/0.20.0/tutorials/cluster.html">Clustered deployment</a> for
+information on deploying Druid services across clustered machines.</p>
+<p>The software requirements for the installation machine are:</p>
+<ul>
+<li>Linux, Mac OS X, or other Unix-like OS (Windows is not supported)</li>
+<li>Java 8, Update 92 or later (8u92+)</li>
+</ul>
+<blockquote>
+<p>Druid officially supports Java 8 only. Support for later major versions of Java is currently in experimental status.</p>
+</blockquote>
+<blockquote>
+<p>Druid relies on the environment variables <code>JAVA_HOME</code> or <code>DRUID_JAVA_HOME</code> to find Java on the machine. You can set
+<code>DRUID_JAVA_HOME</code> if there is more than one instance of Java. To verify Java requirements for your environment, run the
+<code>bin/verify-java</code> script.</p>
+</blockquote>
+<p>Before installing a production Druid instance, be sure to consider the user account on the operating system under
+which Druid will run. This is important because any Druid console user will have, effectively, the same permissions as
+that user. So, for example, the file browser UI will show console users the files that the underlying user can
+access. In general, avoid running Druid as root user. Consider creating a dedicated user account for running Druid.</p>
+<h2><a class="anchor" aria-hidden="true" id="step-1-install-druid"></a><a href="#step-1-install-druid" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Step 1. Install Druid</h2>
+<p>After confirming the <a href="#requirements">requirements</a>, follow these steps:</p>
+<ol>
+<li><p>Download
+the <a href="https://www.apache.org/dyn/closer.cgi?path=/druid/0.20.0/apache-druid-0.20.0-bin.tar.gz">0.20.0 release</a>.</p></li>
+<li><p>In your terminal, extract Druid and change directories to the distribution directory:</p>
+<pre><code class="hljs css language-bash">tar -xzf apache-druid-0.20.0-bin.tar.gz
+<span class="hljs-built_in">cd</span> apache-druid-0.20.0
+</code></pre></li>
+</ol>
+<p>In the directory, you'll find <code>LICENSE</code> and <code>NOTICE</code> files and subdirectories for executable files, configuration files, sample data and more.</p>
+<h2><a class="anchor" aria-hidden="true" id="step-2-start-up-druid-services"></a><a href="#step-2-start-up-druid-services" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Step 2: Start up Druid services</h2>
+<p>Start up Druid services using the <code>micro-quickstart</code> single-machine configuration.</p>
+<p>From the apache-druid-0.20.0 package root, run the following command:</p>
+<pre><code class="hljs css language-bash">./bin/start-micro-quickstart
+</code></pre>
+<p>This brings up instances of ZooKeeper and the Druid services:</p>
+<pre><code class="hljs css language-bash">$ ./bin/start-micro-quickstart
+[Fri May  3 11:40:50 2019] Running <span class="hljs-built_in">command</span>[zk], logging to[/apache-druid-0.20.0/var/sv/zk.log]: bin/run-zk conf
+[Fri May  3 11:40:50 2019] Running <span class="hljs-built_in">command</span>[coordinator-overlord], logging to[/apache-druid-0.20.0/var/sv/coordinator-overlord.log]: bin/run-druid coordinator-overlord conf/druid/single-server/micro-quickstart
+[Fri May  3 11:40:50 2019] Running <span class="hljs-built_in">command</span>[broker], logging to[/apache-druid-0.20.0/var/sv/broker.log]: bin/run-druid broker conf/druid/single-server/micro-quickstart
+[Fri May  3 11:40:50 2019] Running <span class="hljs-built_in">command</span>[router], logging to[/apache-druid-0.20.0/var/sv/router.log]: bin/run-druid router conf/druid/single-server/micro-quickstart
+[Fri May  3 11:40:50 2019] Running <span class="hljs-built_in">command</span>[historical], logging to[/apache-druid-0.20.0/var/sv/historical.log]: bin/run-druid historical conf/druid/single-server/micro-quickstart
+[Fri May  3 11:40:50 2019] Running <span class="hljs-built_in">command</span>[middleManager], logging to[/apache-druid-0.20.0/var/sv/middleManager.log]: bin/run-druid middleManager conf/druid/single-server/micro-quickstart
+</code></pre>
+<p>All persistent state, such as the cluster metadata store and segments for the services, are kept in the <code>var</code> directory under
+the Druid root directory, apache-druid-0.20.0. Each service writes to a log file under <code>var/sv</code>, as noted in the startup script output above.</p>
+<p>At any time, you can revert Druid to its original, post-installation state by deleting the entire <code>var</code> directory. You may
+want to do this, for example, between Druid tutorials or after experimentation, to start with a fresh instance.</p>
+<p>To stop Druid at any time, use CTRL-C in the terminal. This exits the <code>bin/start-micro-quickstart</code> script and
+terminates all Druid processes.</p>
+<h2><a class="anchor" aria-hidden="true" id="step-3-open-the-druid-console"></a><a href="#step-3-open-the-druid-console" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Step 3. Open the Druid console</h2>
+<p>After the Druid services finish startup, open the <a href="/docs/0.20.0/operations/druid-console.html">Druid console</a> at <a href="http://localhost:8888">http://localhost:8888</a>.</p>
+<p><img src="../assets/tutorial-quickstart-01.png" alt="Druid console" title="Druid console"></p>
+<p>It may take a few seconds for all Druid services to finish starting, including the <a href="/docs/0.20.0/design/router.html">Druid router</a>, which serves the console. If you attempt to open the Druid console before startup is complete, you may see errors in the browser. Wait a few moments and try again.</p>
+<h2><a class="anchor" aria-hidden="true" id="step-4-load-data"></a><a href="#step-4-load-data" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Step 4. Load data</h2>
+<p>Ingestion specs define the schema of the data Druid reads and stores. You can write ingestion specs by hand or using the <em>data loader</em>,
+as we'll do here to perform batch file loading with Druid's native batch ingestion.</p>
+<p>The Druid distribution bundles sample data we can use. The sample data located in <code>quickstart/tutorial/wikiticker-2015-09-12-sampled.json.gz</code>
+in the Druid root directory represents Wikipedia page edits for a given day.</p>
+<ol>
+<li><p>Click <strong>Load data</strong> from the Druid console header (<img src="../assets/tutorial-batch-data-loader-00.png" alt="Load data">).</p></li>
+<li><p>Select the <strong>Local disk</strong> tile and then click <strong>Connect data</strong>.</p>
+<p><img src="../assets/tutorial-batch-data-loader-01.png" alt="Data loader init" title="Data loader init"></p></li>
+<li><p>Enter the following values:</p>
+<ul>
+<li><p><strong>Base directory</strong>: <code>quickstart/tutorial/</code></p></li>
+<li><p><strong>File filter</strong>: <code>wikiticker-2015-09-12-sampled.json.gz</code></p></li>
+</ul>
+<p><img src="../assets/tutorial-batch-data-loader-015.png" alt="Data location" title="Data location"></p>
+<p>Entering the base directory and <a href="https://commons.apache.org/proper/commons-io/apidocs/org/apache/commons/io/filefilter/WildcardFileFilter.html">wildcard file filter</a> separately, as afforded by the UI, allows you to specify multiple files for ingestion at once.</p></li>
+<li><p>Click <strong>Apply</strong>.</p>
+<p>The data loader displays the raw data, giving you a chance to verify that the data
+appears as expected.</p>
+<p><img src="../assets/tutorial-batch-data-loader-02.png" alt="Data loader sample" title="Data loader sample"></p>
+<p>Notice that your position in the sequence of steps to load data, <strong>Connect</strong> in our case, appears at the top of the console, as shown below.
+You can click other steps to move forward or backward in the sequence at any time.</p>
+<p><img src="../assets/tutorial-batch-data-loader-12.png" alt="Load data"></p></li>
+</ol>
+<ol start="5">
+<li><p>Click <strong>Next: Parse data</strong>.</p>
+<p>The data loader tries to determine the parser appropriate for the data format automatically. In this case
+it identifies the data format as <code>json</code>, as shown in the <strong>Input format</strong> field at the bottom right.</p>
+<p><img src="../assets/tutorial-batch-data-loader-03.png" alt="Data loader parse data" title="Data loader parse data"></p>
+<p>Feel free to select other <strong>Input format</strong> options to get a sense of their configuration settings
+and how Druid parses other types of data.</p></li>
+<li><p>With the JSON parser selected, click <strong>Next: Parse time</strong>. The <strong>Parse time</strong> settings are where you view and adjust the
+primary timestamp column for the data.</p>
+<p><img src="../assets/tutorial-batch-data-loader-04.png" alt="Data loader parse time" title="Data loader parse time"></p>
+<p>Druid requires data to have a primary timestamp column (internally stored in a column called <code>__time</code>).
+If you do not have a timestamp in your data, select <code>Constant value</code>. In our example, the data loader
+determines that the <code>time</code> column is the only candidate that can be used as the primary time column.</p></li>
+<li><p>Click <strong>Next: Transform</strong>, <strong>Next: Filter</strong>, and then <strong>Next: Configure schema</strong>, skipping a few steps.</p>
+<p>You do not need to adjust transformation or filtering settings, as applying ingestion time transforms and
+filters are out of scope for this tutorial.</p></li>
+<li><p>The Configure schema settings are where you configure what <a href="/docs/0.20.0/ingestion/index.html#dimensions">dimensions</a>
+and <a href="/docs/0.20.0/ingestion/index.html#metrics">metrics</a> are ingested. The outcome of this configuration represents exactly how the
+data will appear in Druid after ingestion.</p>
+<p>Since our dataset is very small, you can turn off <a href="/docs/0.20.0/ingestion/index.html#rollup">rollup</a>
+by unsetting the <strong>Rollup</strong> switch and confirming the change when prompted.</p>
+<p><img src="../assets/tutorial-batch-data-loader-05.png" alt="Data loader schema" title="Data loader schema"></p></li>
+</ol>
+<ol start="10">
+<li><p>Click <strong>Next: Partition</strong> to configure how the data will be split into segments. In this case, choose <code>DAY</code> as
+the <strong>Segment granularity</strong>.</p>
+<p><img src="../assets/tutorial-batch-data-loader-06.png" alt="Data loader partition" title="Data loader partition"></p>
+<p>Since this is a small dataset, we can have just a single segment, which is what selecting <code>DAY</code> as the
+segment granularity gives us.</p></li>
+<li><p>Click <strong>Next: Tune</strong> and <strong>Next: Publish</strong>.</p></li>
+<li><p>The Publish settings are where you specify the datasource name in Druid. Let's change the default name from
+<code>wikiticker-2015-09-12-sampled</code> to <code>wikipedia</code>.</p>
+<p><img src="../assets/tutorial-batch-data-loader-07.png" alt="Data loader publish" title="Data loader publish"></p></li>
+</ol>
+<ol start="13">
+<li><p>Click <strong>Next: Edit spec</strong> to review the ingestion spec we've constructed with the data loader.</p>
+<p><img src="../assets/tutorial-batch-data-loader-08.png" alt="Data loader spec" title="Data loader spec"></p>
+<p>Feel free to go back and change settings from previous steps to see how doing so updates the spec.
+Similarly, you can edit the spec directly and see it reflected in the previous steps.</p>
+<blockquote>
+<p>For other ways to load ingestion specs in Druid, see <a href="/docs/0.20.0/tutorials/tutorial-batch.html">Tutorial: Loading a file</a>.</p>
+</blockquote></li>
+<li><p>Once you are satisfied with the spec, click <strong>Submit</strong>.</p>
+<p>The new task for our wikipedia datasource now appears in the Ingestion view.</p>
+<p><img src="../assets/tutorial-batch-data-loader-09.png" alt="Tasks view" title="Tasks view"></p>
+<p>The task may take a minute or two to complete. When done, the task status should be &quot;SUCCESS&quot;, with
+the duration of the task indicated. Note that the view is set to automatically
+refresh, so you do not need to refresh the browser to see the status change.</p>
+<p>A successful task means that one or more segments have been built and are now picked up by our data servers.</p></li>
+</ol>
+<h2><a class="anchor" aria-hidden="true" id="step-5-query-the-data"></a><a href="#step-5-query-the-data" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Step 5. Query the data</h2>
+<p>You can now see the data as a datasource in the console and try out a query, as follows:</p>
+<ol>
+<li><p>Click <strong>Datasources</strong> from the console header.</p>
+<p>If the wikipedia datasource doesn't appear, wait a few moments for the segment to finish loading. A datasource is
+queryable once it is shown to be &quot;Fully available&quot; in the <strong>Availability</strong> column.</p></li>
+<li><p>When the datasource is available, open the Actions menu (<img src="../assets/datasources-action-button.png" alt="Actions">) for that
+datasource and choose <strong>Query with SQL</strong>.</p>
+<p><img src="../assets/tutorial-batch-data-loader-10.png" alt="Datasource view" title="Datasource view"></p>
+<blockquote>
+<p>Notice the other actions you can perform for a datasource, including configuring retention rules, compaction, and more.</p>
+</blockquote></li>
+<li><p>Run the prepopulated query, <code>SELECT * FROM &quot;wikipedia&quot;</code> to see the results.</p>
+<p><img src="../assets/tutorial-batch-data-loader-11.png" alt="Query view" title="Query view"></p></li>
+</ol>
+<p>Congratulations! You've gone from downloading Druid to querying data in just one quickstart. See the following
+section for what to do next.</p>
+<h2><a class="anchor" aria-hidden="true" id="next-steps"></a><a href="#next-steps" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Next steps</h2>
+<p>After finishing the quickstart, check out the <a href="/docs/0.20.0/tutorials/tutorial-query.html">query tutorial</a> to further explore
+Query features in the Druid console.</p>
+<p>Alternatively, learn about other ways to ingest data in one of these tutorials:</p>
+<ul>
+<li><a href="/docs/0.20.0/tutorials/tutorial-kafka.html">Loading stream data from Apache Kafka</a> – How to load streaming data from a Kafka topic.</li>
+<li><a href="/docs/0.20.0/tutorials/tutorial-batch-hadoop.html">Loading a file using Apache Hadoop</a> – How to perform a batch file load, using a remote Hadoop cluster.</li>
+<li><a href="/docs/0.20.0/tutorials/tutorial-ingestion-spec.html">Writing your own ingestion spec</a> – How to write a new ingestion spec and use it to load data.</li>
+</ul>
+<p>Remember that after stopping Druid services, you can start clean next time by deleting the <code>var</code> directory from the Druid root directory and
+running the <code>bin/start-micro-quickstart</code> script again. You will likely want to do this before taking other data ingestion tutorials,
+since in them you will create the same wikipedia datasource.</p>
+</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/0.20.0/design/index.html"><span class="arrow-prev">← </span><span>Introduction to Apache Druid</span></a><a class="docs-next button" href="/docs/0.20.0/tutorials/docker.html"><span>Docker</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#requirements">Requirements</a></li><li><a href="#step-1-install-druid">Step 1. Install Druid</a></li><li><a href="#step-2-start-up-druid-services">Step 2: Start up Druid services</a></li><li><a href="#step-3-open-the-druid-console">Step 3. Open the Druid console</a></li><li><a href="#step-4-load-data">Step 4. Load data</a></li><li><a href="#step-5-query-the-data">Step 5. Query the data</a></li><li><a href="#next-steps">Next steps</a></li></ul></nav></div><footer class="nav-footer druid-footer" id="footer"><div class="container"><div class="text-center"><p><a href="/technology">Technology</a> · <a href="/use-cases">Use Cases</a> · <a href="/druid-powered">Powered by Druid</a> · <a href="/docs/0.20.0/latest">Docs</a> · <a href="/community/">Community</a> · <a href="/downloads.html">Download</a> · <a href="/faq">FAQ</a></p></div><div class="text-center"><a title="Join the user group" href="https://groups.google.com/forum/#!forum/druid-user" target="_blank"><span class="fa fa-comments"></span></a> · <a title="Follow Druid" href="https://twitter.com/druidio" target="_blank"><span class="fab fa-twitter"></span></a> · <a title="Download via Apache" href="https://www.apache.org/dyn/closer.cgi?path=/incubator/druid/{{ site.druid_versions[0].versions[0].version }}/apache-druid-{{ site.druid_versions[0].versions[0].version }}-bin.tar.gz" target="_blank"><span class="fas fa-feather"></span></a> · <a title="GitHub" href="https://github.com/apache/druid" target="_blank"><span class="fab fa-github"></span></a></div><div class="text-center license">Copyright © 2019 <a href="https://www.apache.org/" target="_blank">Apache Software Foundation</a>.<br/>Except where otherwise noted, licensed under <a rel="license" href="http://creativecommons.org/licenses/by-sa/4.0/">CC BY-SA 4.0</a>.<br/>Apache Druid, Druid, and the Druid logo are either registered trademarks or trademarks of The Apache Software Foundation in the United States and other countries.</div></div></footer></div><script type="text/javascript" src="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.js"></script><script>
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+        </script></nav></div><div class="container mainContainer docsContainer"><div class="wrapper"><div class="post"><header class="postHeader"><a class="edit-page-link button" href="https://github.com/apache/druid/edit/master/docs/tutorials/tutorial-batch-hadoop.md" target="_blank" rel="noreferrer noopener">Edit</a><h1 id="__docusaurus" class="postHeaderTitle">Tutorial: Load batch data using Apache Hadoop</h1></header><article><div><span><!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
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+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+  -->
+<p>This tutorial shows you how to load data files into Apache Druid using a remote Hadoop cluster.</p>
+<p>For this tutorial, we'll assume that you've already completed the previous
+<a href="tutorial-batch.html">batch ingestion tutorial</a> using Druid's native batch ingestion system and are using the
+<code>micro-quickstart</code> single-machine configuration as described in the <a href="index.html">quickstart</a>.</p>
+<h2><a class="anchor" aria-hidden="true" id="install-docker"></a><a href="#install-docker" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Install Docker</h2>
+<p>This tutorial requires <a href="https://docs.docker.com/install/">Docker</a> to be installed on the tutorial machine.</p>
+<p>Once the Docker install is complete, please proceed to the next steps in the tutorial.</p>
+<h2><a class="anchor" aria-hidden="true" id="build-the-hadoop-docker-image"></a><a href="#build-the-hadoop-docker-image" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Build the Hadoop docker image</h2>
+<p>For this tutorial, we've provided a Dockerfile for a Hadoop 2.8.5 cluster, which we'll use to run the batch indexing task.</p>
+<p>This Dockerfile and related files are located at <code>quickstart/tutorial/hadoop/docker</code>.</p>
+<p>From the apache-druid-0.20.0 package root, run the following commands to build a Docker image named &quot;druid-hadoop-demo&quot; with version tag &quot;2.8.5&quot;:</p>
+<pre><code class="hljs css language-bash"><span class="hljs-built_in">cd</span> quickstart/tutorial/hadoop/docker
+docker build -t druid-hadoop-demo:2.8.5 .
+</code></pre>
+<p>This will start building the Hadoop image. Once the image build is done, you should see the message <code>Successfully tagged druid-hadoop-demo:2.8.5</code> printed to the console.</p>
+<h2><a class="anchor" aria-hidden="true" id="setup-the-hadoop-docker-cluster"></a><a href="#setup-the-hadoop-docker-cluster" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Setup the Hadoop docker cluster</h2>
+<h3><a class="anchor" aria-hidden="true" id="create-temporary-shared-directory"></a><a href="#create-temporary-shared-directory" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Create temporary shared directory</h3>
+<p>We'll need a shared folder between the host and the Hadoop container for transferring some files.</p>
+<p>Let's create some folders under <code>/tmp</code>, we will use these later when starting the Hadoop container:</p>
+<pre><code class="hljs css language-bash">mkdir -p /tmp/shared
+mkdir -p /tmp/shared/hadoop_xml
+</code></pre>
+<h3><a class="anchor" aria-hidden="true" id="configure-etchosts"></a><a href="#configure-etchosts" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Configure /etc/hosts</h3>
+<p>On the host machine, add the following entry to <code>/etc/hosts</code>:</p>
+<pre><code class="hljs"><span class="hljs-number">127.0.0.1</span> druid-hadoop-demo
+</code></pre>
+<h3><a class="anchor" aria-hidden="true" id="start-the-hadoop-container"></a><a href="#start-the-hadoop-container" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Start the Hadoop container</h3>
+<p>Once the <code>/tmp/shared</code> folder has been created and the <code>etc/hosts</code> entry has been added, run the following command to start the Hadoop container.</p>
+<pre><code class="hljs css language-bash">docker run -it  -h druid-hadoop-demo --name druid-hadoop-demo -p 2049:2049 -p 2122:2122 -p 8020:8020 -p 8021:8021 -p 8030:8030 -p 8031:8031 -p 8032:8032 -p 8033:8033 -p 8040:8040 -p 8042:8042 -p 8088:8088 -p 8443:8443 -p 9000:9000 -p 10020:10020 -p 19888:19888 -p 34455:34455 -p 49707:49707 -p 50010:50010 -p 50020:50020 -p 50030:50030 -p 50060:50060 -p 50070:50070 -p 50075:50075 -p 50090:50090 -p 51111:51111 -v /tmp/shared:/shared druid-hadoop-demo:2.8.5 /etc/bootstrap.sh -bash
+</code></pre>
+<p>Once the container is started, your terminal will attach to a bash shell running inside the container:</p>
+<pre><code class="hljs css language-bash">Starting sshd:                                             [  OK  ]
+18/07/26 17:27:15 WARN util.NativeCodeLoader: Unable to load native-hadoop library <span class="hljs-keyword">for</span> your platform... using <span class="hljs-built_in">builtin</span>-java classes <span class="hljs-built_in">where</span> applicable
+Starting namenodes on [druid-hadoop-demo]
+druid-hadoop-demo: starting namenode, logging to /usr/<span class="hljs-built_in">local</span>/hadoop/logs/hadoop-root-namenode-druid-hadoop-demo.out
+localhost: starting datanode, logging to /usr/<span class="hljs-built_in">local</span>/hadoop/logs/hadoop-root-datanode-druid-hadoop-demo.out
+Starting secondary namenodes [0.0.0.0]
+0.0.0.0: starting secondarynamenode, logging to /usr/<span class="hljs-built_in">local</span>/hadoop/logs/hadoop-root-secondarynamenode-druid-hadoop-demo.out
+18/07/26 17:27:31 WARN util.NativeCodeLoader: Unable to load native-hadoop library <span class="hljs-keyword">for</span> your platform... using <span class="hljs-built_in">builtin</span>-java classes <span class="hljs-built_in">where</span> applicable
+starting yarn daemons
+starting resourcemanager, logging to /usr/<span class="hljs-built_in">local</span>/hadoop/logs/yarn--resourcemanager-druid-hadoop-demo.out
+localhost: starting nodemanager, logging to /usr/<span class="hljs-built_in">local</span>/hadoop/logs/yarn-root-nodemanager-druid-hadoop-demo.out
+starting historyserver, logging to /usr/<span class="hljs-built_in">local</span>/hadoop/logs/mapred--historyserver-druid-hadoop-demo.out
+bash-4.1<span class="hljs-comment">#</span>
+</code></pre>
+<p>The <code>Unable to load native-hadoop library for your platform... using builtin-java classes where applicable</code> warning messages can be safely ignored.</p>
+<h4><a class="anchor" aria-hidden="true" id="accessing-the-hadoop-container-shell"></a><a href="#accessing-the-hadoop-container-shell" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Accessing the Hadoop container shell</h4>
+<p>To open another shell to the Hadoop container, run the following command:</p>
+<pre><code class="hljs"><span class="hljs-symbol">docker</span> exec -<span class="hljs-keyword">it </span>druid-hadoop-demo <span class="hljs-keyword">bash
+</span></code></pre>
+<h3><a class="anchor" aria-hidden="true" id="copy-input-data-to-the-hadoop-container"></a><a href="#copy-input-data-to-the-hadoop-container" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Copy input data to the Hadoop container</h3>
+<p>From the apache-druid-0.20.0 package root on the host, copy the <code>quickstart/tutorial/wikiticker-2015-09-12-sampled.json.gz</code> sample data to the shared folder:</p>
+<pre><code class="hljs css language-bash">cp quickstart/tutorial/wikiticker-2015-09-12-sampled.json.gz /tmp/shared/wikiticker-2015-09-12-sampled.json.gz
+</code></pre>
+<h3><a class="anchor" aria-hidden="true" id="setup-hdfs-directories"></a><a href="#setup-hdfs-directories" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Setup HDFS directories</h3>
+<p>In the Hadoop container's shell, run the following commands to setup the HDFS directories needed by this tutorial and copy the input data to HDFS.</p>
+<pre><code class="hljs css language-bash"><span class="hljs-built_in">cd</span> /usr/<span class="hljs-built_in">local</span>/hadoop/bin
+./hdfs dfs -mkdir /druid
+./hdfs dfs -mkdir /druid/segments
+./hdfs dfs -mkdir /quickstart
+./hdfs dfs -chmod 777 /druid
+./hdfs dfs -chmod 777 /druid/segments
+./hdfs dfs -chmod 777 /quickstart
+./hdfs dfs -chmod -R 777 /tmp
+./hdfs dfs -chmod -R 777 /user
+./hdfs dfs -put /shared/wikiticker-2015-09-12-sampled.json.gz /quickstart/wikiticker-2015-09-12-sampled.json.gz
+</code></pre>
+<p>If you encounter namenode errors when running this command, the Hadoop container may not be finished initializing. When this occurs, wait a couple of minutes and retry the commands.</p>
+<h2><a class="anchor" aria-hidden="true" id="configure-druid-to-use-hadoop"></a><a href="#configure-druid-to-use-hadoop" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Configure Druid to use Hadoop</h2>
+<p>Some additional steps are needed to configure the Druid cluster for Hadoop batch indexing.</p>
+<h3><a class="anchor" aria-hidden="true" id="copy-hadoop-configuration-to-druid-classpath"></a><a href="#copy-hadoop-configuration-to-druid-classpath" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Copy Hadoop configuration to Druid classpath</h3>
+<p>From the Hadoop container's shell, run the following command to copy the Hadoop .xml configuration files to the shared folder:</p>
+<pre><code class="hljs css language-bash">cp /usr/<span class="hljs-built_in">local</span>/hadoop/etc/hadoop/*.xml /shared/hadoop_xml
+</code></pre>
+<p>From the host machine, run the following, where {PATH_TO_DRUID} is replaced by the path to the Druid package.</p>
+<pre><code class="hljs css language-bash">mkdir -p {PATH_TO_DRUID}/conf/druid/single-server/micro-quickstart/_common/hadoop-xml
+cp /tmp/shared/hadoop_xml/*.xml {PATH_TO_DRUID}/conf/druid/single-server/micro-quickstart/_common/hadoop-xml/
+</code></pre>
+<h3><a class="anchor" aria-hidden="true" id="update-druid-segment-and-log-storage"></a><a href="#update-druid-segment-and-log-storage" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Update Druid segment and log storage</h3>
+<p>In your favorite text editor, open <code>conf/druid/single-server/micro-quickstart/_common/common.runtime.properties</code>, and make the following edits:</p>
+<h4><a class="anchor" aria-hidden="true" id="disable-local-deep-storage-and-enable-hdfs-deep-storage"></a><a href="#disable-local-deep-storage-and-enable-hdfs-deep-storage" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Disable local deep storage and enable HDFS deep storage</h4>
+<pre><code class="hljs"><span class="hljs-meta">#</span>
+<span class="hljs-meta"># Deep storage</span>
+<span class="hljs-meta">#</span>
+
+<span class="hljs-meta"># For local disk (only viable in a cluster if this is a network mount):</span>
+<span class="hljs-meta">#druid.storage.type=local</span>
+<span class="hljs-meta">#druid.storage.storageDirectory=var/druid/segments</span>
+
+<span class="hljs-meta"># For HDFS:</span>
+druid.storage.type=hdfs
+druid.storage.storageDirectory=/druid/segments
+</code></pre>
+<h4><a class="anchor" aria-hidden="true" id="disable-local-log-storage-and-enable-hdfs-log-storage"></a><a href="#disable-local-log-storage-and-enable-hdfs-log-storage" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Disable local log storage and enable HDFS log storage</h4>
+<pre><code class="hljs"><span class="hljs-meta">#</span>
+<span class="hljs-meta"># Indexing service logs</span>
+<span class="hljs-meta">#</span>
+
+<span class="hljs-meta"># For local disk (only viable in a cluster if this is a network mount):</span>
+<span class="hljs-meta">#druid.indexer.logs.type=file</span>
+<span class="hljs-meta">#druid.indexer.logs.directory=var/druid/indexing-logs</span>
+
+<span class="hljs-meta"># For HDFS:</span>
+druid.indexer.logs.type=hdfs
+druid.indexer.logs.directory=/druid/indexing-logs
+
+</code></pre>
+<h3><a class="anchor" aria-hidden="true" id="restart-druid-cluster"></a><a href="#restart-druid-cluster" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Restart Druid cluster</h3>
+<p>Once the Hadoop .xml files have been copied to the Druid cluster and the segment/log storage configuration has been updated to use HDFS, the Druid cluster needs to be restarted for the new configurations to take effect.</p>
+<p>If the cluster is still running, CTRL-C to terminate the <code>bin/start-micro-quickstart</code> script, and re-run it to bring the Druid services back up.</p>
+<h2><a class="anchor" aria-hidden="true" id="load-batch-data"></a><a href="#load-batch-data" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Load batch data</h2>
+<p>We've included a sample of Wikipedia edits from September 12, 2015 to get you started.</p>
+<p>To load this data into Druid, you can submit an <em>ingestion task</em> pointing to the file. We've included
+a task that loads the <code>wikiticker-2015-09-12-sampled.json.gz</code> file included in the archive.</p>
+<p>Let's submit the <code>wikipedia-index-hadoop.json</code> task:</p>
+<pre><code class="hljs css language-bash">bin/post-index-task --file quickstart/tutorial/wikipedia-index-hadoop.json --url http://localhost:8081
+</code></pre>
+<h2><a class="anchor" aria-hidden="true" id="querying-your-data"></a><a href="#querying-your-data" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Querying your data</h2>
+<p>After the data load is complete, please follow the <a href="/docs/0.20.0/tutorials/tutorial-query.html">query tutorial</a> to run some example queries on the newly loaded data.</p>
+<h2><a class="anchor" aria-hidden="true" id="cleanup"></a><a href="#cleanup" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Cleanup</h2>
+<p>This tutorial is only meant to be used together with the <a href="/docs/0.20.0/tutorials/tutorial-query.html">query tutorial</a>.</p>
+<p>If you wish to go through any of the other tutorials, you will need to:</p>
+<ul>
+<li>Shut down the cluster and reset the cluster state by removing the contents of the <code>var</code> directory under the druid package.</li>
+<li>Revert the deep storage and task storage config back to local types in <code>conf/druid/single-server/micro-quickstart/_common/common.runtime.properties</code></li>
+<li>Restart the cluster</li>
+</ul>
+<p>This is necessary because the other ingestion tutorials will write to the same &quot;wikipedia&quot; datasource, and later tutorials expect the cluster to use local deep storage.</p>
+<p>Example reverted config:</p>
+<pre><code class="hljs"><span class="hljs-meta">#</span>
+<span class="hljs-meta"># Deep storage</span>
+<span class="hljs-meta">#</span>
+
+<span class="hljs-meta"># For local disk (only viable in a cluster if this is a network mount):</span>
+druid.storage.type=local
+druid.storage.storageDirectory=<span class="hljs-keyword">var</span>/druid/segments
+
+<span class="hljs-meta"># For HDFS:</span>
+<span class="hljs-meta">#druid.storage.type=hdfs</span>
+<span class="hljs-meta">#druid.storage.storageDirectory=/druid/segments</span>
+
+<span class="hljs-meta">#</span>
+<span class="hljs-meta"># Indexing service logs</span>
+<span class="hljs-meta">#</span>
+
+<span class="hljs-meta"># For local disk (only viable in a cluster if this is a network mount):</span>
+druid.indexer.logs.type=file
+druid.indexer.logs.directory=<span class="hljs-keyword">var</span>/druid/indexing-logs
+
+<span class="hljs-meta"># For HDFS:</span>
+<span class="hljs-meta">#druid.indexer.logs.type=hdfs</span>
+<span class="hljs-meta">#druid.indexer.logs.directory=/druid/indexing-logs</span>
+
+</code></pre>
+<h2><a class="anchor" aria-hidden="true" id="further-reading"></a><a href="#further-reading" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Further reading</h2>
+<p>For more information on loading batch data with Hadoop, please see <a href="/docs/0.20.0/ingestion/hadoop.html">the Hadoop batch ingestion documentation</a>.</p>
+</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/0.20.0/tutorials/tutorial-kafka.html"><span class="arrow-prev">← </span><span>Load from Apache Kafka</span></a><a class="docs-next button" href="/docs/0.20.0/tutorials/tutorial-query.html"><span>Querying data</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#install-docker">Install Docker</a></li><li><a href="#build-the-hadoop-docker-image">Build the Hadoop docker image</a></li><li><a href="#setup-the-hadoop-docker-cluster">Setup the Hadoop docker cluster</a><ul class="toc-headings"><li><a href="#create-temporary-shared-directory">Create temporary shared directory</a></li><li><a href="#configure-etchosts">Configure /etc/hosts</a></li><li><a href="#start-the-hadoop-container">Start the Hadoop container</a></li><li><a href="#copy-input-data-to-the-hadoop-container">Copy input data to the Hadoop container</a></li><li><a href="#setup-hdfs-directories">Setup HDFS directories</a></li></ul></li><li><a href="#configure-druid-to-use-hadoop">Configure Druid to use Hadoop</a><ul class="toc-headings"><li><a href="#copy-hadoop-configuration-to-druid-classpath">Copy Hadoop configuration to Druid classpath</a></li><li><a href="#update-druid-segment-and-log-storage">Update Druid segment and log storage</a></li><li><a href="#restart-druid-cluster">Restart Druid cluster</a></li></ul></li><li><a href="#load-batch-data">Load batch data</a></li><li><a href="#querying-your-data">Querying your data</a></li><li><a href="#cleanup">Cleanup</a></li><li><a href="#further-reading">Further reading</a></li></ul></nav></div><footer class="nav-footer druid-footer" id="footer"><div class="container"><div class="text-center"><p><a href="/technology">Technology</a> · <a href="/use-cases">Use Cases</a> · <a href="/druid-powered">Powered by Druid</a> · <a href="/docs/0.20.0/latest">Docs</a> · <a href="/community/">Community</a> · <a href="/downloads.html">Download</a> · <a href="/faq">FAQ</a></p></div><div class="text-center"><a title="Join the user group" href="https://groups.google.com/forum/#!forum/druid-user" target="_blank"><span class="fa fa-comments"></span></a> · <a title="Follow Druid" href="https://twitter.com/druidio" target="_blank"><span class="fab fa-twitter"></span></a> · <a title="Download via Apache" href="https://www.apache.org/dyn/closer.cgi?path=/incubator/druid/{{ site.druid_versions[0].versions[0].version }}/apache-druid-{{ site.druid_versions[0].versions[0].version }}-bin.tar.gz" target="_blank"><span class="fas fa-feather"></span></a> · <a title="GitHub" href="https://github.com/apache/druid" target="_blank"><span class="fab fa-github"></span></a></div><div class="text-center license">Copyright © 2019 <a href="https://www.apache.org/" target="_blank">Apache Software Foundation</a>.<br/>Except where otherwise noted, licensed under <a rel="license" href="http://creativecommons.org/licenses/by-sa/4.0/">CC BY-SA 4.0</a>.<br/>Apache Druid, Druid, and the Druid logo are either registered trademarks or trademarks of The Apache Software Foundation in the United States and other countries.</div></div></footer></div><script type="text/javascript" src="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.js"></script><script>
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+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Tutorial: Loading a file · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/0.20.0/tutorials/tutorial-batch.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.20.0" /><meta property="og:title" content="Tutorial: Loading a file · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
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+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
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+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+  -->
+<p>This tutorial demonstrates how to load data into Apache Druid from a file using Apache Druid's native batch ingestion feature.</p>
+<p>You initiate data loading in Druid by submitting an <em>ingestion task</em> spec to the Druid Overlord. You can write ingestion
+specs by hand or using the <em>data loader</em> built into the Druid console.</p>
+<p>The <a href="/docs/0.20.0/tutorials/index.html">Quickstart</a> shows you how to use the data loader to build an ingestion spec. For production environments, it's
+likely that you'll want to automate data ingestion. This tutorial starts by showing you how to submit an ingestion spec
+directly in the Druid console, and then introduces ways to ingest batch data that lend themselves to
+automation—from the command line and from a script.</p>
+<h2><a class="anchor" aria-hidden="true" id="loading-data-with-a-spec-via-console"></a><a href="#loading-data-with-a-spec-via-console" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Loading data with a spec (via console)</h2>
+<p>The Druid package includes the following sample native batch ingestion task spec at <code>quickstart/tutorial/wikipedia-index.json</code>, shown here for convenience,
+which has been configured to read the <code>quickstart/tutorial/wikiticker-2015-09-12-sampled.json.gz</code> input file:</p>
+<pre><code class="hljs css language-json">{
+  <span class="hljs-attr">"type"</span> : <span class="hljs-string">"index_parallel"</span>,
+  <span class="hljs-attr">"spec"</span> : {
+    <span class="hljs-attr">"dataSchema"</span> : {
+      <span class="hljs-attr">"dataSource"</span> : <span class="hljs-string">"wikipedia"</span>,
+      <span class="hljs-attr">"dimensionsSpec"</span> : {
+        <span class="hljs-attr">"dimensions"</span> : [
+          <span class="hljs-string">"channel"</span>,
+          <span class="hljs-string">"cityName"</span>,
+          <span class="hljs-string">"comment"</span>,
+          <span class="hljs-string">"countryIsoCode"</span>,
+          <span class="hljs-string">"countryName"</span>,
+          <span class="hljs-string">"isAnonymous"</span>,
+          <span class="hljs-string">"isMinor"</span>,
+          <span class="hljs-string">"isNew"</span>,
+          <span class="hljs-string">"isRobot"</span>,
+          <span class="hljs-string">"isUnpatrolled"</span>,
+          <span class="hljs-string">"metroCode"</span>,
+          <span class="hljs-string">"namespace"</span>,
+          <span class="hljs-string">"page"</span>,
+          <span class="hljs-string">"regionIsoCode"</span>,
+          <span class="hljs-string">"regionName"</span>,
+          <span class="hljs-string">"user"</span>,
+          { <span class="hljs-attr">"name"</span>: <span class="hljs-string">"added"</span>, <span class="hljs-attr">"type"</span>: <span class="hljs-string">"long"</span> },
+          { <span class="hljs-attr">"name"</span>: <span class="hljs-string">"deleted"</span>, <span class="hljs-attr">"type"</span>: <span class="hljs-string">"long"</span> },
+          { <span class="hljs-attr">"name"</span>: <span class="hljs-string">"delta"</span>, <span class="hljs-attr">"type"</span>: <span class="hljs-string">"long"</span> }
+        ]
+      },
+      <span class="hljs-attr">"timestampSpec"</span>: {
+        <span class="hljs-attr">"column"</span>: <span class="hljs-string">"time"</span>,
+        <span class="hljs-attr">"format"</span>: <span class="hljs-string">"iso"</span>
+      },
+      <span class="hljs-attr">"metricsSpec"</span> : [],
+      <span class="hljs-attr">"granularitySpec"</span> : {
+        <span class="hljs-attr">"type"</span> : <span class="hljs-string">"uniform"</span>,
+        <span class="hljs-attr">"segmentGranularity"</span> : <span class="hljs-string">"day"</span>,
+        <span class="hljs-attr">"queryGranularity"</span> : <span class="hljs-string">"none"</span>,
+        <span class="hljs-attr">"intervals"</span> : [<span class="hljs-string">"2015-09-12/2015-09-13"</span>],
+        <span class="hljs-attr">"rollup"</span> : <span class="hljs-literal">false</span>
+      }
+    },
+    <span class="hljs-attr">"ioConfig"</span> : {
+      <span class="hljs-attr">"type"</span> : <span class="hljs-string">"index_parallel"</span>,
+      <span class="hljs-attr">"inputSource"</span> : {
+        <span class="hljs-attr">"type"</span> : <span class="hljs-string">"local"</span>,
+        <span class="hljs-attr">"baseDir"</span> : <span class="hljs-string">"quickstart/tutorial/"</span>,
+        <span class="hljs-attr">"filter"</span> : <span class="hljs-string">"wikiticker-2015-09-12-sampled.json.gz"</span>
+      },
+      <span class="hljs-attr">"inputFormat"</span> :  {
+        <span class="hljs-attr">"type"</span>: <span class="hljs-string">"json"</span>
+      },
+      <span class="hljs-attr">"appendToExisting"</span> : <span class="hljs-literal">false</span>
+    },
+    <span class="hljs-attr">"tuningConfig"</span> : {
+      <span class="hljs-attr">"type"</span> : <span class="hljs-string">"index_parallel"</span>,
+      <span class="hljs-attr">"maxRowsPerSegment"</span> : <span class="hljs-number">5000000</span>,
+      <span class="hljs-attr">"maxRowsInMemory"</span> : <span class="hljs-number">25000</span>
+    }
+  }
+}
+</code></pre>
+<p>This spec creates a datasource named &quot;wikipedia&quot;.</p>
+<p>From the Ingestion view, click the ellipses next to Tasks and choose <code>Submit JSON task</code>.</p>
+<p><img src="../assets/tutorial-batch-submit-task-01.png" alt="Tasks view add task" title="Tasks view add task"></p>
+<p>This brings up the spec submission dialog where you can paste the spec above.</p>
+<p><img src="../assets/tutorial-batch-submit-task-02.png" alt="Query view" title="Query view"></p>
+<p>Once the spec is submitted, wait a few moments for the data to load, after which you can query it.</p>
+<h2><a class="anchor" aria-hidden="true" id="loading-data-with-a-spec-via-command-line"></a><a href="#loading-data-with-a-spec-via-command-line" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Loading data with a spec (via command line)</h2>
+<p>For convenience, the Druid package includes a batch ingestion helper script at <code>bin/post-index-task</code>.</p>
+<p>This script will POST an ingestion task to the Druid Overlord and poll Druid until the data is available for querying.</p>
+<p>Run the following command from Druid package root:</p>
+<pre><code class="hljs css language-bash">bin/post-index-task --file quickstart/tutorial/wikipedia-index.json --url http://localhost:8081
+</code></pre>
+<p>You should see output like the following:</p>
+<pre><code class="hljs css language-bash">Beginning indexing data <span class="hljs-keyword">for</span> wikipedia
+Task started: index_wikipedia_2018-07-27T06:37:44.323Z
+Task <span class="hljs-built_in">log</span>:     http://localhost:8081/druid/indexer/v1/task/index_wikipedia_2018-07-27T06:37:44.323Z/<span class="hljs-built_in">log</span>
+Task status:  http://localhost:8081/druid/indexer/v1/task/index_wikipedia_2018-07-27T06:37:44.323Z/status
+Task index_wikipedia_2018-07-27T06:37:44.323Z still running...
+Task index_wikipedia_2018-07-27T06:37:44.323Z still running...
+Task finished with status: SUCCESS
+Completed indexing data <span class="hljs-keyword">for</span> wikipedia. Now loading indexed data onto the cluster...
+wikipedia loading complete! You may now query your data
+</code></pre>
+<p>Once the spec is submitted, you can follow the same instructions as above to wait for the data to load and then query it.</p>
+<h2><a class="anchor" aria-hidden="true" id="loading-data-without-the-script"></a><a href="#loading-data-without-the-script" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Loading data without the script</h2>
+<p>Let's briefly discuss how we would've submitted the ingestion task without using the script. You do not need to run these commands.</p>
+<p>To submit the task, POST it to Druid in a new terminal window from the apache-druid-0.20.0 directory:</p>
+<pre><code class="hljs css language-bash">curl -X <span class="hljs-string">'POST'</span> -H <span class="hljs-string">'Content-Type:application/json'</span> -d @quickstart/tutorial/wikipedia-index.json http://localhost:8081/druid/indexer/v1/task
+</code></pre>
+<p>Which will print the ID of the task if the submission was successful:</p>
+<pre><code class="hljs css language-bash">{<span class="hljs-string">"task"</span>:<span class="hljs-string">"index_wikipedia_2018-06-09T21:30:32.802Z"</span>}
+</code></pre>
+<p>You can monitor the status of this task from the console as outlined above.</p>
+<h2><a class="anchor" aria-hidden="true" id="querying-your-data"></a><a href="#querying-your-data" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Querying your data</h2>
+<p>Once the data is loaded, please follow the <a href="/docs/0.20.0/tutorials/tutorial-query.html">query tutorial</a> to run some example queries on the newly loaded data.</p>
+<h2><a class="anchor" aria-hidden="true" id="cleanup"></a><a href="#cleanup" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Cleanup</h2>
+<p>If you wish to go through any of the other ingestion tutorials, you will need to shut down the cluster and reset the cluster state by removing the contents of the <code>var</code> directory under the druid package, as the other tutorials will write to the same &quot;wikipedia&quot; datasource.</p>
+<h2><a class="anchor" aria-hidden="true" id="further-reading"></a><a href="#further-reading" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Further reading</h2>
+<p>For more information on loading batch data, please see <a href="/docs/0.20.0/ingestion/native-batch.html">the native batch ingestion documentation</a>.</p>
+</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/0.20.0/tutorials/cluster.html"><span class="arrow-prev">← </span><span>Clustered deployment</span></a><a class="docs-next button" href="/docs/0.20.0/tutorials/tutorial-kafka.html"><span>Load from Apache Kafka</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#loading-data-with-a-spec-via-console">Loading data with a spec (via console)</a></li><li><a href="#loading-data-with-a-spec-via-command-line">Loading data with a spec (via command line)</a></li><li><a href="#loading-data-without-the-script">Loading data without the script</a></li><li><a href="#querying-your-data">Querying your data</a></li><li><a href="#cleanup">Cleanup</a></li><li><a href="#further-reading">Further reading</a></li></ul></nav></div><footer class="nav-footer druid-footer" id="footer"><div class="container"><div class="text-center"><p><a href="/technology">Technology</a> · <a href="/use-cases">Use Cases</a> · <a href="/druid-powered">Powered by Druid</a> · <a href="/docs/0.20.0/latest">Docs</a> · <a href="/community/">Community</a> · <a href="/downloads.html">Download</a> · <a href="/faq">FAQ</a></p></div><div class="text-center"><a title="Join the user group" href="https://groups.google.com/forum/#!forum/druid-user" target="_blank"><span class="fa fa-comments"></span></a> · <a title="Follow Druid" href="https://twitter.com/druidio" target="_blank"><span class="fab fa-twitter"></span></a> · <a title="Download via Apache" href="https://www.apache.org/dyn/closer.cgi?path=/incubator/druid/{{ site.druid_versions[0].versions[0].version }}/apache-druid-{{ site.druid_versions[0].versions[0].version }}-bin.tar.gz" target="_blank"><span class="fas fa-feather"></span></a> · <a title="GitHub" href="https://github.com/apache/druid" target="_blank"><span class="fab fa-github"></span></a></div><div class="text-center license">Copyright © 2019 <a href="https://www.apache.org/" target="_blank">Apache Software Foundation</a>.<br/>Except where otherwise noted, licensed under <a rel="license" href="http://creativecommons.org/licenses/by-sa/4.0/">CC BY-SA 4.0</a>.<br/>Apache Druid, Druid, and the Druid logo are either registered trademarks or trademarks of The Apache Software Foundation in the United States and other countries.</div></div></footer></div><script type="text/javascript" src="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.js"></script><script>
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+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Tutorial: Compacting segments · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/0.20.0/tutorials/tutorial-compaction.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.20.0" /><meta property="og:title" content="Tutorial: Compacting segments · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
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+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
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+  ~ to you under the Apache License, Version 2.0 (the
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+<p>This tutorial demonstrates how to compact existing segments into fewer but larger segments.</p>
+<p>Because there is some per-segment memory and processing overhead, it can sometimes be beneficial to reduce the total number of segments.
+Please check <a href="/docs/0.20.0/operations/segment-optimization.html">Segment size optimization</a> for details.</p>
+<p>For this tutorial, we'll assume you've already downloaded Apache Druid as described in
+the <a href="index.html">single-machine quickstart</a> and have it running on your local machine.</p>
+<p>It will also be helpful to have finished <a href="/docs/0.20.0/tutorials/tutorial-batch.html">Tutorial: Loading a file</a> and <a href="/docs/0.20.0/tutorials/tutorial-query.html">Tutorial: Querying data</a>.</p>
+<h2><a class="anchor" aria-hidden="true" id="load-the-initial-data"></a><a href="#load-the-initial-data" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Load the initial data</h2>
+<p>For this tutorial, we'll be using the Wikipedia edits sample data, with an ingestion task spec that will create 1-3 segments per hour in the input data.</p>
+<p>The ingestion spec can be found at <code>quickstart/tutorial/compaction-init-index.json</code>. Let's submit that spec, which will create a datasource called <code>compaction-tutorial</code>:</p>
+<pre><code class="hljs css language-bash">bin/post-index-task --file quickstart/tutorial/compaction-init-index.json --url http://localhost:8081
+</code></pre>
+<blockquote>
+<p>Please note that <code>maxRowsPerSegment</code> in the ingestion spec is set to 1000. This is to generate multiple segments per hour and <em>NOT</em> recommended in production.
+It's 5000000 by default and may need to be adjusted to make your segments optimized.</p>
+</blockquote>
+<p>After the ingestion completes, go to <a href="http://localhost:8888/unified-console.html#datasources">http://localhost:8888/unified-console.html#datasources</a> in a browser to see the new datasource in the Druid Console.</p>
+<p><img src="../assets/tutorial-compaction-01.png" alt="compaction-tutorial datasource" title="compaction-tutorial datasource"></p>
+<p>Click the <code>51 segments</code> link next to &quot;Fully Available&quot; for the <code>compaction-tutorial</code> datasource to view information about the datasource's segments:</p>
+<p>There will be 51 segments for this datasource, 1-3 segments per hour in the input data:</p>
+<p><img src="../assets/tutorial-compaction-02.png" alt="Original segments" title="Original segments"></p>
+<p>Running a COUNT(*) query on this datasource shows that there are 39,244 rows:</p>
+<pre><code class="hljs css language-bash">dsql&gt; select count(*) from <span class="hljs-string">"compaction-tutorial"</span>;
+┌────────┐
+│ EXPR<span class="hljs-variable">$0</span> │
+├────────┤
+│  39244 │
+└────────┘
+Retrieved 1 row <span class="hljs-keyword">in</span> 1.38s.
+</code></pre>
+<h2><a class="anchor" aria-hidden="true" id="compact-the-data"></a><a href="#compact-the-data" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Compact the data</h2>
+<p>Let's now compact these 51 small segments.</p>
+<p>We have included a compaction task spec for this tutorial datasource at <code>quickstart/tutorial/compaction-keep-granularity.json</code>:</p>
+<pre><code class="hljs css language-json">{
+  <span class="hljs-attr">"type"</span>: <span class="hljs-string">"compact"</span>,
+  <span class="hljs-attr">"dataSource"</span>: <span class="hljs-string">"compaction-tutorial"</span>,
+  <span class="hljs-attr">"interval"</span>: <span class="hljs-string">"2015-09-12/2015-09-13"</span>,
+  <span class="hljs-attr">"tuningConfig"</span> : {
+    <span class="hljs-attr">"type"</span> : <span class="hljs-string">"index_parallel"</span>,
+    <span class="hljs-attr">"maxRowsPerSegment"</span> : <span class="hljs-number">5000000</span>,
+    <span class="hljs-attr">"maxRowsInMemory"</span> : <span class="hljs-number">25000</span>
+  }
+}
+</code></pre>
+<p>This will compact all segments for the interval <code>2015-09-12/2015-09-13</code> in the <code>compaction-tutorial</code> datasource.</p>
+<p>The parameters in the <code>tuningConfig</code> control how many segments will be present in the compacted set of segments.</p>
+<p>In this tutorial example, only one compacted segment will be created per hour, as each hour has less rows than the 5000000 <code>maxRowsPerSegment</code> (note that the total number of rows is 39244).</p>
+<p>Let's submit this task now:</p>
+<pre><code class="hljs css language-bash">bin/post-index-task --file quickstart/tutorial/compaction-keep-granularity.json --url http://localhost:8081
+</code></pre>
+<p>After the task finishes, refresh the <a href="http://localhost:8888/unified-console.html#segments">segments view</a>.</p>
+<p>The original 51 segments will eventually be marked as &quot;unused&quot; by the Coordinator and removed, with the new compacted segments remaining.</p>
+<p>By default, the Druid Coordinator will not mark segments as unused until the Coordinator process has been up for at least 15 minutes, so you may see the old segment set and the new compacted set at the same time in the Druid Console, with 75 total segments:</p>
+<p><img src="../assets/tutorial-compaction-03.png" alt="Compacted segments intermediate state 1" title="Compacted segments intermediate state 1"></p>
+<p><img src="../assets/tutorial-compaction-04.png" alt="Compacted segments intermediate state 2" title="Compacted segments intermediate state 2"></p>
+<p>The new compacted segments have a more recent version than the original segments, so even when both sets of segments are shown in the Druid Console, queries will only read from the new compacted segments.</p>
+<p>Let's try running a COUNT(*) on <code>compaction-tutorial</code> again, where the row count should still be 39,244:</p>
+<pre><code class="hljs css language-bash">dsql&gt; select count(*) from <span class="hljs-string">"compaction-tutorial"</span>;
+┌────────┐
+│ EXPR<span class="hljs-variable">$0</span> │
+├────────┤
+│  39244 │
+└────────┘
+Retrieved 1 row <span class="hljs-keyword">in</span> 1.30s.
+</code></pre>
+<p>After the Coordinator has been running for at least 15 minutes, the <a href="http://localhost:8888/unified-console.html#segments">segments view</a> should show there are 24 segments, one per hour:</p>
+<p><img src="../assets/tutorial-compaction-05.png" alt="Compacted segments hourly granularity 1" title="Compacted segments hourly granularity 1"></p>
+<p><img src="../assets/tutorial-compaction-06.png" alt="Compacted segments hourly granularity 2" title="Compacted segments hourly granularity 2"></p>
+<h2><a class="anchor" aria-hidden="true" id="compact-the-data-with-new-segment-granularity"></a><a href="#compact-the-data-with-new-segment-granularity" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Compact the data with new segment granularity</h2>
+<p>The compaction task can also produce compacted segments with a granularity different from the granularity of the input segments.</p>
+<p>We have included a compaction task spec that will create DAY granularity segments at <code>quickstart/tutorial/compaction-day-granularity.json</code>:</p>
+<pre><code class="hljs css language-json">{
+  <span class="hljs-attr">"type"</span>: <span class="hljs-string">"compact"</span>,
+  <span class="hljs-attr">"dataSource"</span>: <span class="hljs-string">"compaction-tutorial"</span>,
+  <span class="hljs-attr">"interval"</span>: <span class="hljs-string">"2015-09-12/2015-09-13"</span>,
+  <span class="hljs-attr">"segmentGranularity"</span>: <span class="hljs-string">"DAY"</span>,
+  <span class="hljs-attr">"tuningConfig"</span> : {
+    <span class="hljs-attr">"type"</span> : <span class="hljs-string">"index_parallel"</span>,
+    <span class="hljs-attr">"maxRowsPerSegment"</span> : <span class="hljs-number">5000000</span>,
+    <span class="hljs-attr">"maxRowsInMemory"</span> : <span class="hljs-number">25000</span>,
+    <span class="hljs-attr">"forceExtendableShardSpecs"</span> : <span class="hljs-literal">true</span>
+  }
+}
+</code></pre>
+<p>Note that <code>segmentGranularity</code> is set to <code>DAY</code> in this compaction task spec.</p>
+<p>Let's submit this task now:</p>
+<pre><code class="hljs css language-bash">bin/post-index-task --file quickstart/tutorial/compaction-day-granularity.json --url http://localhost:8081
+</code></pre>
+<p>It will take a bit of time before the Coordinator marks the old input segments as unused, so you may see an intermediate state with 25 total segments. Eventually, there will only be one DAY granularity segment:</p>
+<p><img src="../assets/tutorial-compaction-07.png" alt="Compacted segments day granularity 1" title="Compacted segments day granularity 1"></p>
+<p><img src="../assets/tutorial-compaction-08.png" alt="Compacted segments day granularity 2" title="Compacted segments day granularity 2"></p>
+<h2><a class="anchor" aria-hidden="true" id="further-reading"></a><a href="#further-reading" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Further reading</h2>
+<p><a href="/docs/0.20.0/ingestion/tasks.html">Task documentation</a></p>
+<p><a href="/docs/0.20.0/operations/segment-optimization.html">Segment optimization</a></p>
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+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
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+  ~   http://www.apache.org/licenses/LICENSE-2.0
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+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+  -->
+<p>This tutorial demonstrates how to delete existing data.</p>
+<p>For this tutorial, we'll assume you've already downloaded Apache Druid as described in
+the <a href="index.html">single-machine quickstart</a> and have it running on your local machine.</p>
+<h2><a class="anchor" aria-hidden="true" id="load-initial-data"></a><a href="#load-initial-data" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Load initial data</h2>
+<p>In this tutorial, we will use the Wikipedia edits data, with an indexing spec that creates hourly segments. This spec is located at <code>quickstart/tutorial/deletion-index.json</code>, and it creates a datasource called <code>deletion-tutorial</code>.</p>
+<p>Let's load this initial data:</p>
+<pre><code class="hljs css language-bash">bin/post-index-task --file quickstart/tutorial/deletion-index.json --url http://localhost:8081
+</code></pre>
+<p>When the load finishes, open <a href="http://localhost:8888/unified-console.html#datasources">http://localhost:8888/unified-console.html#datasources</a> in a browser.</p>
+<h2><a class="anchor" aria-hidden="true" id="how-to-permanently-delete-data"></a><a href="#how-to-permanently-delete-data" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>How to permanently delete data</h2>
+<p>Permanent deletion of a Druid segment has two steps:</p>
+<ol>
+<li>The segment must first be marked as &quot;unused&quot;. This occurs when a user manually disables a segment through the Coordinator API.</li>
+<li>After segments have been marked as &quot;unused&quot;, a Kill Task will delete any &quot;unused&quot; segments from Druid's metadata store as well as deep storage.</li>
+</ol>
+<p>Let's drop some segments now, by using the coordinator API to drop data by interval and segmentIds.</p>
+<h2><a class="anchor" aria-hidden="true" id="disable-segments-by-interval"></a><a href="#disable-segments-by-interval" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Disable segments by interval</h2>
+<p>Let's disable segments in a specified interval. This will mark all segments in the interval as &quot;unused&quot;, but not remove them from deep storage.
+Let's disable segments in interval <code>2015-09-12T18:00:00.000Z/2015-09-12T20:00:00.000Z</code> i.e. between hour 18 and 20.</p>
+<pre><code class="hljs css language-bash">curl -X <span class="hljs-string">'POST'</span> -H <span class="hljs-string">'Content-Type:application/json'</span> -d <span class="hljs-string">'{ "interval" : "2015-09-12T18:00:00.000Z/2015-09-12T20:00:00.000Z" }'</span> http://localhost:8081/druid/coordinator/v1/datasources/deletion-tutorial/markUnused
+</code></pre>
+<p>After that command completes, you should see that the segment for hour 18 and 19 have been disabled:</p>
+<p><img src="../assets/tutorial-deletion-02.png" alt="Segments 2" title="Segments 2"></p>
+<p>Note that the hour 18 and 19 segments are still present in deep storage:</p>
+<pre><code class="hljs css language-bash">$ ls -l1 var/druid/segments/deletion-tutorial/
+2015-09-12T00:00:00.000Z_2015-09-12T01:00:00.000Z
+2015-09-12T01:00:00.000Z_2015-09-12T02:00:00.000Z
+2015-09-12T02:00:00.000Z_2015-09-12T03:00:00.000Z
+2015-09-12T03:00:00.000Z_2015-09-12T04:00:00.000Z
+2015-09-12T04:00:00.000Z_2015-09-12T05:00:00.000Z
+2015-09-12T05:00:00.000Z_2015-09-12T06:00:00.000Z
+2015-09-12T06:00:00.000Z_2015-09-12T07:00:00.000Z
+2015-09-12T07:00:00.000Z_2015-09-12T08:00:00.000Z
+2015-09-12T08:00:00.000Z_2015-09-12T09:00:00.000Z
+2015-09-12T09:00:00.000Z_2015-09-12T10:00:00.000Z
+2015-09-12T10:00:00.000Z_2015-09-12T11:00:00.000Z
+2015-09-12T11:00:00.000Z_2015-09-12T12:00:00.000Z
+2015-09-12T12:00:00.000Z_2015-09-12T13:00:00.000Z
+2015-09-12T13:00:00.000Z_2015-09-12T14:00:00.000Z
+2015-09-12T14:00:00.000Z_2015-09-12T15:00:00.000Z
+2015-09-12T15:00:00.000Z_2015-09-12T16:00:00.000Z
+2015-09-12T16:00:00.000Z_2015-09-12T17:00:00.000Z
+2015-09-12T17:00:00.000Z_2015-09-12T18:00:00.000Z
+2015-09-12T18:00:00.000Z_2015-09-12T19:00:00.000Z
+2015-09-12T19:00:00.000Z_2015-09-12T20:00:00.000Z
+2015-09-12T20:00:00.000Z_2015-09-12T21:00:00.000Z
+2015-09-12T21:00:00.000Z_2015-09-12T22:00:00.000Z
+2015-09-12T22:00:00.000Z_2015-09-12T23:00:00.000Z
+2015-09-12T23:00:00.000Z_2015-09-13T00:00:00.000Z
+</code></pre>
+<h2><a class="anchor" aria-hidden="true" id="disable-segments-by-segment-ids"></a><a href="#disable-segments-by-segment-ids" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Disable segments by segment IDs</h2>
+<p>Let's disable some segments by their segmentID. This will again mark the segments as &quot;unused&quot;, but not remove them from deep storage. You can see the full segmentID for a segment from UI as explained below.</p>
+<p>In the <a href="http://localhost:8888/unified-console.html#segments">segments view</a>, click the arrow on the left side of one of the remaining segments to expand the segment entry:</p>
+<p><img src="../assets/tutorial-deletion-01.png" alt="Segments" title="Segments"></p>
+<p>The top of the info box shows the full segment ID, e.g. <code>deletion-tutorial_2015-09-12T14:00:00.000Z_2015-09-12T15:00:00.000Z_2019-02-28T01:11:51.606Z</code> for the segment of hour 14.</p>
+<p>Let's disable the hour 13 and 14 segments by sending a POST request to the Coordinator with this payload</p>
+<pre><code class="hljs css language-json">{
+  <span class="hljs-attr">"segmentIds"</span>:
+  [
+    <span class="hljs-string">"deletion-tutorial_2015-09-12T13:00:00.000Z_2015-09-12T14:00:00.000Z_2019-05-01T17:38:46.961Z"</span>,
+    <span class="hljs-string">"deletion-tutorial_2015-09-12T14:00:00.000Z_2015-09-12T15:00:00.000Z_2019-05-01T17:38:46.961Z"</span>
+  ]
+}
+</code></pre>
+<p>This payload json has been provided at <code>quickstart/tutorial/deletion-disable-segments.json</code>. Submit the POST request to Coordinator like this:</p>
+<pre><code class="hljs css language-bash">curl -X <span class="hljs-string">'POST'</span> -H <span class="hljs-string">'Content-Type:application/json'</span> -d @quickstart/tutorial/deletion-disable-segments.json http://localhost:8081/druid/coordinator/v1/datasources/deletion-tutorial/markUnused
+</code></pre>
+<p>After that command completes, you should see that the segments for hour 13 and 14 have been disabled:</p>
+<p><img src="../assets/tutorial-deletion-03.png" alt="Segments 3" title="Segments 3"></p>
+<p>Note that the hour 13 and 14 segments are still in deep storage:</p>
+<pre><code class="hljs css language-bash">$ ls -l1 var/druid/segments/deletion-tutorial/
+2015-09-12T00:00:00.000Z_2015-09-12T01:00:00.000Z
+2015-09-12T01:00:00.000Z_2015-09-12T02:00:00.000Z
+2015-09-12T02:00:00.000Z_2015-09-12T03:00:00.000Z
+2015-09-12T03:00:00.000Z_2015-09-12T04:00:00.000Z
+2015-09-12T04:00:00.000Z_2015-09-12T05:00:00.000Z
+2015-09-12T05:00:00.000Z_2015-09-12T06:00:00.000Z
+2015-09-12T06:00:00.000Z_2015-09-12T07:00:00.000Z
+2015-09-12T07:00:00.000Z_2015-09-12T08:00:00.000Z
+2015-09-12T08:00:00.000Z_2015-09-12T09:00:00.000Z
+2015-09-12T09:00:00.000Z_2015-09-12T10:00:00.000Z
+2015-09-12T10:00:00.000Z_2015-09-12T11:00:00.000Z
+2015-09-12T11:00:00.000Z_2015-09-12T12:00:00.000Z
+2015-09-12T12:00:00.000Z_2015-09-12T13:00:00.000Z
+2015-09-12T13:00:00.000Z_2015-09-12T14:00:00.000Z
+2015-09-12T14:00:00.000Z_2015-09-12T15:00:00.000Z
+2015-09-12T15:00:00.000Z_2015-09-12T16:00:00.000Z
+2015-09-12T16:00:00.000Z_2015-09-12T17:00:00.000Z
+2015-09-12T17:00:00.000Z_2015-09-12T18:00:00.000Z
+2015-09-12T18:00:00.000Z_2015-09-12T19:00:00.000Z
+2015-09-12T19:00:00.000Z_2015-09-12T20:00:00.000Z
+2015-09-12T20:00:00.000Z_2015-09-12T21:00:00.000Z
+2015-09-12T21:00:00.000Z_2015-09-12T22:00:00.000Z
+2015-09-12T22:00:00.000Z_2015-09-12T23:00:00.000Z
+2015-09-12T23:00:00.000Z_2015-09-13T00:00:00.000Z
+</code></pre>
+<h2><a class="anchor" aria-hidden="true" id="run-a-kill-task"></a><a href="#run-a-kill-task" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Run a kill task</h2>
+<p>Now that we have disabled some segments, we can submit a Kill Task, which will delete the disabled segments from metadata and deep storage.</p>
+<p>A Kill Task spec has been provided at <code>quickstart/tutorial/deletion-kill.json</code>. Submit this task to the Overlord with the following command:</p>
+<pre><code class="hljs css language-bash">curl -X <span class="hljs-string">'POST'</span> -H <span class="hljs-string">'Content-Type:application/json'</span> -d @quickstart/tutorial/deletion-kill.json http://localhost:8081/druid/indexer/v1/task
+</code></pre>
+<p>After this task completes, you can see that the disabled segments have now been removed from deep storage:</p>
+<pre><code class="hljs css language-bash">$ ls -l1 var/druid/segments/deletion-tutorial/
+2015-09-12T12:00:00.000Z_2015-09-12T13:00:00.000Z
+2015-09-12T15:00:00.000Z_2015-09-12T16:00:00.000Z
+2015-09-12T16:00:00.000Z_2015-09-12T17:00:00.000Z
+2015-09-12T17:00:00.000Z_2015-09-12T18:00:00.000Z
+2015-09-12T20:00:00.000Z_2015-09-12T21:00:00.000Z
+2015-09-12T21:00:00.000Z_2015-09-12T22:00:00.000Z
+2015-09-12T22:00:00.000Z_2015-09-12T23:00:00.000Z
+2015-09-12T23:00:00.000Z_2015-09-13T00:00:00.000Z
+</code></pre>
+</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/0.20.0/tutorials/tutorial-compaction.html"><span class="arrow-prev">← </span><span>Compacting segments</span></a><a class="docs-next button" href="/docs/0.20.0/tutorials/tutorial-ingestion-spec.html"><span>Writing an ingestion spec</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#load-initial-data">Load initial data</a></li><li><a href="#how-to-permanently-delete-data">How to permanently delete data</a></li><li><a href="#disable-segments-by-interval">Disable segments by interval</a></li><li><a href="#disable-segments-by-segment-ids">Disable segments by segment IDs</a></li><li><a href="#run-a-kill-task">Run a kill task</a></li></ul></nav></div><footer class="nav-footer druid-footer" id="footer"><div class="container"><div class="text-center"><p><a href="/technology">Technology</a> · <a href="/use-cases">Use Cases</a> · <a href="/druid-powered">Powered by Druid</a> · <a href="/docs/0.20.0/latest">Docs</a> · <a href="/community/">Community</a> · <a href="/downloads.html">Download</a> · <a href="/faq">FAQ</a></p></div><div class="text-center"><a title="Join the user group" href="https://groups.google.com/forum/#!forum/druid-user" target="_blank"><span class="fa fa-comments"></span></a> · <a title="Follow Druid" href="https://twitter.com/druidio" target="_blank"><span class="fab fa-twitter"></span></a> · <a title="Download via Apache" href="https://www.apache.org/dyn/closer.cgi?path=/incubator/druid/{{ site.druid_versions[0].versions[0].version }}/apache-druid-{{ site.druid_versions[0].versions[0].version }}-bin.tar.gz" target="_blank"><span class="fas fa-feather"></span></a> · <a title="GitHub" href="https://github.com/apache/druid" target="_blank"><span class="fab fa-github"></span></a></div><div class="text-center license">Copyright © 2019 <a href="https://www.apache.org/" target="_blank">Apache Software Foundation</a>.<br/>Except where otherwise noted, licensed under <a rel="license" href="http://creativecommons.org/licenses/by-sa/4.0/">CC BY-SA 4.0</a>.<br/>Apache Druid, Druid, and the Druid logo are either registered trademarks or trademarks of The Apache Software Foundation in the United States and other countries.</div></div></footer></div><script type="text/javascript" src="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.js"></script><script>
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+<p>This tutorial will guide the reader through the process of defining an ingestion spec, pointing out key considerations and guidelines.</p>
+<p>For this tutorial, we'll assume you've already downloaded Apache Druid as described in
+the <a href="index.html">single-machine quickstart</a> and have it running on your local machine.</p>
+<p>It will also be helpful to have finished <a href="/docs/0.20.0/tutorials/tutorial-batch.html">Tutorial: Loading a file</a>, <a href="/docs/0.20.0/tutorials/tutorial-query.html">Tutorial: Querying data</a>, and <a href="/docs/0.20.0/tutorials/tutorial-rollup.html">Tutorial: Rollup</a>.</p>
+<h2><a class="anchor" aria-hidden="true" id="example-data"></a><a href="#example-data" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Example data</h2>
+<p>Suppose we have the following network flow data:</p>
+<ul>
+<li><code>srcIP</code>: IP address of sender</li>
+<li><code>srcPort</code>: Port of sender</li>
+<li><code>dstIP</code>: IP address of receiver</li>
+<li><code>dstPort</code>: Port of receiver</li>
+<li><code>protocol</code>: IP protocol number</li>
+<li><code>packets</code>: number of packets transmitted</li>
+<li><code>bytes</code>: number of bytes transmitted</li>
+<li><code>cost</code>: the cost of sending the traffic</li>
+</ul>
+<pre><code class="hljs css language-json">{<span class="hljs-attr">"ts"</span>:<span class="hljs-string">"2018-01-01T01:01:35Z"</span>,<span class="hljs-attr">"srcIP"</span>:<span class="hljs-string">"1.1.1.1"</span>, <span class="hljs-attr">"dstIP"</span>:<span class="hljs-string">"2.2.2.2"</span>, <span class="hljs-attr">"srcPort"</span>:<span class="hljs-number">2000</span>, <span class="hljs-attr">"dstPort"</span>:<span class="hljs-number">3000</span>, <span class="hljs-attr">"protocol"</span>: <span class="hljs-number">6</span>, <span class="hljs-attr">"packets"</span>:<span class="hljs-number">10</span>, <span class="hljs-attr">"bytes"</span>:<span class="hljs-number">1000</span>, <span class="hljs-attr">"cost"</span>: <span class="hljs-number">1.4</span>}
+{<span class="hljs-attr">"ts"</span>:<span class="hljs-string">"2018-01-01T01:01:51Z"</span>,<span class="hljs-attr">"srcIP"</span>:<span class="hljs-string">"1.1.1.1"</span>, <span class="hljs-attr">"dstIP"</span>:<span class="hljs-string">"2.2.2.2"</span>, <span class="hljs-attr">"srcPort"</span>:<span class="hljs-number">2000</span>, <span class="hljs-attr">"dstPort"</span>:<span class="hljs-number">3000</span>, <span class="hljs-attr">"protocol"</span>: <span class="hljs-number">6</span>, <span class="hljs-attr">"packets"</span>:<span class="hljs-number">20</span>, <span class="hljs-attr">"bytes"</span>:<span class="hljs-number">2000</span>, <span class="hljs-attr">"cost"</span>: <span class="hljs-number">3.1</span>}
+{<span class="hljs-attr">"ts"</span>:<span class="hljs-string">"2018-01-01T01:01:59Z"</span>,<span class="hljs-attr">"srcIP"</span>:<span class="hljs-string">"1.1.1.1"</span>, <span class="hljs-attr">"dstIP"</span>:<span class="hljs-string">"2.2.2.2"</span>, <span class="hljs-attr">"srcPort"</span>:<span class="hljs-number">2000</span>, <span class="hljs-attr">"dstPort"</span>:<span class="hljs-number">3000</span>, <span class="hljs-attr">"protocol"</span>: <span class="hljs-number">6</span>, <span class="hljs-attr">"packets"</span>:<span class="hljs-number">30</span>, <span class="hljs-attr">"bytes"</span>:<span class="hljs-number">3000</span>, <span class="hljs-attr">"cost"</span>: <span class="hljs-number">0.4</span>}
+{<span class="hljs-attr">"ts"</span>:<span class="hljs-string">"2018-01-01T01:02:14Z"</span>,<span class="hljs-attr">"srcIP"</span>:<span class="hljs-string">"1.1.1.1"</span>, <span class="hljs-attr">"dstIP"</span>:<span class="hljs-string">"2.2.2.2"</span>, <span class="hljs-attr">"srcPort"</span>:<span class="hljs-number">5000</span>, <span class="hljs-attr">"dstPort"</span>:<span class="hljs-number">7000</span>, <span class="hljs-attr">"protocol"</span>: <span class="hljs-number">6</span>, <span class="hljs-attr">"packets"</span>:<span class="hljs-number">40</span>, <span class="hljs-attr">"bytes"</span>:<span class="hljs-number">4000</span>, <span class="hljs-attr">"cost"</span>: <span class="hljs-number">7.9</span>}
+{<span class="hljs-attr">"ts"</span>:<span class="hljs-string">"2018-01-01T01:02:29Z"</span>,<span class="hljs-attr">"srcIP"</span>:<span class="hljs-string">"1.1.1.1"</span>, <span class="hljs-attr">"dstIP"</span>:<span class="hljs-string">"2.2.2.2"</span>, <span class="hljs-attr">"srcPort"</span>:<span class="hljs-number">5000</span>, <span class="hljs-attr">"dstPort"</span>:<span class="hljs-number">7000</span>, <span class="hljs-attr">"protocol"</span>: <span class="hljs-number">6</span>, <span class="hljs-attr">"packets"</span>:<span class="hljs-number">50</span>, <span class="hljs-attr">"bytes"</span>:<span class="hljs-number">5000</span>, <span class="hljs-attr">"cost"</span>: <span class="hljs-number">10.2</span>}
+{<span class="hljs-attr">"ts"</span>:<span class="hljs-string">"2018-01-01T01:03:29Z"</span>,<span class="hljs-attr">"srcIP"</span>:<span class="hljs-string">"1.1.1.1"</span>, <span class="hljs-attr">"dstIP"</span>:<span class="hljs-string">"2.2.2.2"</span>, <span class="hljs-attr">"srcPort"</span>:<span class="hljs-number">5000</span>, <span class="hljs-attr">"dstPort"</span>:<span class="hljs-number">7000</span>, <span class="hljs-attr">"protocol"</span>: <span class="hljs-number">6</span>, <span class="hljs-attr">"packets"</span>:<span class="hljs-number">60</span>, <span class="hljs-attr">"bytes"</span>:<span class="hljs-number">6000</span>, <span class="hljs-attr">"cost"</span>: <span class="hljs-number">4.3</span>}
+{<span class="hljs-attr">"ts"</span>:<span class="hljs-string">"2018-01-01T02:33:14Z"</span>,<span class="hljs-attr">"srcIP"</span>:<span class="hljs-string">"7.7.7.7"</span>, <span class="hljs-attr">"dstIP"</span>:<span class="hljs-string">"8.8.8.8"</span>, <span class="hljs-attr">"srcPort"</span>:<span class="hljs-number">4000</span>, <span class="hljs-attr">"dstPort"</span>:<span class="hljs-number">5000</span>, <span class="hljs-attr">"protocol"</span>: <span class="hljs-number">17</span>, <span class="hljs-attr">"packets"</span>:<span class="hljs-number">100</span>, <span class="hljs-attr">"bytes"</span>:<span class="hljs-number">10000</span>, <span class="hljs-attr">"cost"</span>: <span class="hljs-number">22.4</span>}
+{<span class="hljs-attr">"ts"</span>:<span class="hljs-string">"2018-01-01T02:33:45Z"</span>,<span class="hljs-attr">"srcIP"</span>:<span class="hljs-string">"7.7.7.7"</span>, <span class="hljs-attr">"dstIP"</span>:<span class="hljs-string">"8.8.8.8"</span>, <span class="hljs-attr">"srcPort"</span>:<span class="hljs-number">4000</span>, <span class="hljs-attr">"dstPort"</span>:<span class="hljs-number">5000</span>, <span class="hljs-attr">"protocol"</span>: <span class="hljs-number">17</span>, <span class="hljs-attr">"packets"</span>:<span class="hljs-number">200</span>, <span class="hljs-attr">"bytes"</span>:<span class="hljs-number">20000</span>, <span class="hljs-attr">"cost"</span>: <span class="hljs-number">34.5</span>}
+{<span class="hljs-attr">"ts"</span>:<span class="hljs-string">"2018-01-01T02:35:45Z"</span>,<span class="hljs-attr">"srcIP"</span>:<span class="hljs-string">"7.7.7.7"</span>, <span class="hljs-attr">"dstIP"</span>:<span class="hljs-string">"8.8.8.8"</span>, <span class="hljs-attr">"srcPort"</span>:<span class="hljs-number">4000</span>, <span class="hljs-attr">"dstPort"</span>:<span class="hljs-number">5000</span>, <span class="hljs-attr">"protocol"</span>: <span class="hljs-number">17</span>, <span class="hljs-attr">"packets"</span>:<span class="hljs-number">300</span>, <span class="hljs-attr">"bytes"</span>:<span class="hljs-number">30000</span>, <span class="hljs-attr">"cost"</span>: <span class="hljs-number">46.3</span>}
+</code></pre>
+<p>Save the JSON contents above into a file called <code>ingestion-tutorial-data.json</code> in <code>quickstart/</code>.</p>
+<p>Let's walk through the process of defining an ingestion spec that can load this data.</p>
+<p>For this tutorial, we will be using the native batch indexing task. When using other task types, some aspects of the ingestion spec will differ, and this tutorial will point out such areas.</p>
+<h2><a class="anchor" aria-hidden="true" id="defining-the-schema"></a><a href="#defining-the-schema" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Defining the schema</h2>
+<p>The core element of a Druid ingestion spec is the <code>dataSchema</code>. The <code>dataSchema</code> defines how to parse input data into a set of columns that will be stored in Druid.</p>
+<p>Let's start with an empty <code>dataSchema</code> and add fields to it as we progress through the tutorial.</p>
+<p>Create a new file called <code>ingestion-tutorial-index.json</code> in <code>quickstart/</code> with the following contents:</p>
+<pre><code class="hljs css language-json">"dataSchema" : {}
+</code></pre>
+<p>We will be making successive edits to this ingestion spec as we progress through the tutorial.</p>
+<h3><a class="anchor" aria-hidden="true" id="datasource-name"></a><a href="#datasource-name" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Datasource name</h3>
+<p>The datasource name is specified by the <code>dataSource</code> parameter in the <code>dataSchema</code>.</p>
+<pre><code class="hljs css language-json">"dataSchema" : {
+  "dataSource" : "ingestion-tutorial",
+}
+</code></pre>
+<p>Let's call the tutorial datasource <code>ingestion-tutorial</code>.</p>
+<h3><a class="anchor" aria-hidden="true" id="time-column"></a><a href="#time-column" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Time column</h3>
+<p>The <code>dataSchema</code> needs to know how to extract the main timestamp field from the input data.</p>
+<p>The timestamp column in our input data is named &quot;ts&quot;, containing ISO 8601 timestamps, so let's add a <code>timestampSpec</code> with that information to the <code>dataSchema</code>:</p>
+<pre><code class="hljs css language-json">"dataSchema" : {
+  "dataSource" : "ingestion-tutorial",
+  "timestampSpec" : {
+    "format" : "iso",
+    "column" : "ts"
+  }
+}
+</code></pre>
+<h3><a class="anchor" aria-hidden="true" id="column-types"></a><a href="#column-types" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Column types</h3>
+<p>Now that we've defined the time column, let's look at definitions for other columns.</p>
+<p>Druid supports the following column types: String, Long, Float, Double. We will see how these are used in the following sections.</p>
+<p>Before we move on to how we define our other non-time columns, let's discuss <code>rollup</code> first.</p>
+<h3><a class="anchor" aria-hidden="true" id="rollup"></a><a href="#rollup" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Rollup</h3>
+<p>When ingesting data, we must consider whether we wish to use rollup or not.</p>
+<ul>
+<li><p>If rollup is enabled, we will need to separate the input columns into two categories, &quot;dimensions&quot; and &quot;metrics&quot;. &quot;Dimensions&quot; are the grouping columns for rollup, while &quot;metrics&quot; are the columns that will be aggregated.</p></li>
+<li><p>If rollup is disabled, then all columns are treated as &quot;dimensions&quot; and no pre-aggregation occurs.</p></li>
+</ul>
+<p>For this tutorial, let's enable rollup. This is specified with a <code>granularitySpec</code> on the <code>dataSchema</code>.</p>
+<pre><code class="hljs css language-json">"dataSchema" : {
+  "dataSource" : "ingestion-tutorial",
+  "timestampSpec" : {
+    "format" : "iso",
+    "column" : "ts"
+  },
+  "granularitySpec" : {
+    "rollup" : true
+  }
+}
+</code></pre>
+<h4><a class="anchor" aria-hidden="true" id="choosing-dimensions-and-metrics"></a><a href="#choosing-dimensions-and-metrics" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Choosing dimensions and metrics</h4>
+<p>For this example dataset, the following is a sensible split for &quot;dimensions&quot; and &quot;metrics&quot;:</p>
+<ul>
+<li>Dimensions: srcIP, srcPort, dstIP, dstPort, protocol</li>
+<li>Metrics: packets, bytes, cost</li>
+</ul>
+<p>The dimensions here are a group of properties that identify a unidirectional flow of IP traffic, while the metrics represent facts about the IP traffic flow specified by a dimension grouping.</p>
+<p>Let's look at how to define these dimensions and metrics within the ingestion spec.</p>
+<h4><a class="anchor" aria-hidden="true" id="dimensions"></a><a href="#dimensions" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Dimensions</h4>
+<p>Dimensions are specified with a <code>dimensionsSpec</code> inside the <code>dataSchema</code>.</p>
+<pre><code class="hljs css language-json">"dataSchema" : {
+  "dataSource" : "ingestion-tutorial",
+  "timestampSpec" : {
+    "format" : "iso",
+    "column" : "ts"
+  },
+  "dimensionsSpec" : {
+    "dimensions": [
+      "srcIP",
+      { "name" : "srcPort", "type" : "long" },
+      { "name" : "dstIP", "type" : "string" },
+      { "name" : "dstPort", "type" : "long" },
+      { "name" : "protocol", "type" : "string" }
+    ]
+  },
+  "granularitySpec" : {
+    "rollup" : true
+  }
+}
+</code></pre>
+<p>Each dimension has a <code>name</code> and a <code>type</code>, where <code>type</code> can be &quot;long&quot;, &quot;float&quot;, &quot;double&quot;, or &quot;string&quot;.</p>
+<p>Note that <code>srcIP</code> is a &quot;string&quot; dimension; for string dimensions, it is enough to specify just a dimension name, since &quot;string&quot; is the default dimension type.</p>
+<p>Also note that <code>protocol</code> is a numeric value in the input data, but we are ingesting it as a &quot;string&quot; column; Druid will coerce the input longs to strings during ingestion.</p>
+<h5><a class="anchor" aria-hidden="true" id="strings-vs-numerics"></a><a href="#strings-vs-numerics" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Strings vs. Numerics</h5>
+<p>Should a numeric input be ingested as a numeric dimension or as a string dimension?</p>
+<p>Numeric dimensions have the following pros/cons relative to String dimensions:</p>
+<ul>
+<li>Pros: Numeric representation can result in smaller column sizes on disk and lower processing overhead when reading values from the column</li>
+<li>Cons: Numeric dimensions do not have indices, so filtering on them will often be slower than filtering on an equivalent String dimension (which has bitmap indices)</li>
+</ul>
+<h4><a class="anchor" aria-hidden="true" id="metrics"></a><a href="#metrics" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Metrics</h4>
+<p>Metrics are specified with a <code>metricsSpec</code> inside the <code>dataSchema</code>:</p>
+<pre><code class="hljs css language-json">"dataSchema" : {
+  "dataSource" : "ingestion-tutorial",
+  "timestampSpec" : {
+    "format" : "iso",
+    "column" : "ts"
+  },
+  "dimensionsSpec" : {
+    "dimensions": [
+      "srcIP",
+      { "name" : "srcPort", "type" : "long" },
+      { "name" : "dstIP", "type" : "string" },
+      { "name" : "dstPort", "type" : "long" },
+      { "name" : "protocol", "type" : "string" }
+    ]
+  },
+  "metricsSpec" : [
+    { "type" : "count", "name" : "count" },
+    { "type" : "longSum", "name" : "packets", "fieldName" : "packets" },
+    { "type" : "longSum", "name" : "bytes", "fieldName" : "bytes" },
+    { "type" : "doubleSum", "name" : "cost", "fieldName" : "cost" }
+  ],
+  "granularitySpec" : {
+    "rollup" : true
+  }
+}
+</code></pre>
+<p>When defining a metric, it is necessary to specify what type of aggregation should be performed on that column during rollup.</p>
+<p>Here we have defined long sum aggregations on the two long metric columns, <code>packets</code> and <code>bytes</code>, and a double sum aggregation for the <code>cost</code> column.</p>
+<p>Note that the <code>metricsSpec</code> is on a different nesting level than <code>dimensionSpec</code> or <code>parseSpec</code>; it belongs on the same nesting level as <code>parser</code> within the <code>dataSchema</code>.</p>
+<p>Note that we have also defined a <code>count</code> aggregator. The count aggregator will track how many rows in the original input data contributed to a &quot;rolled up&quot; row in the final ingested data.</p>
+<h3><a class="anchor" aria-hidden="true" id="no-rollup"></a><a href="#no-rollup" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>No rollup</h3>
+<p>If we were not using rollup, all columns would be specified in the <code>dimensionsSpec</code>, e.g.:</p>
+<pre><code class="hljs css language-json">      "dimensionsSpec" : {
+        "dimensions": [
+          "srcIP",
+          { "name" : "srcPort", "type" : "long" },
+          { "name" : "dstIP", "type" : "string" },
+          { "name" : "dstPort", "type" : "long" },
+          { "name" : "protocol", "type" : "string" },
+          { "name" : "packets", "type" : "long" },
+          { "name" : "bytes", "type" : "long" },
+          { "name" : "srcPort", "type" : "double" }
+        ]
+      },
+</code></pre>
+<h3><a class="anchor" aria-hidden="true" id="define-granularities"></a><a href="#define-granularities" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Define granularities</h3>
+<p>At this point, we are done defining the <code>parser</code> and <code>metricsSpec</code> within the <code>dataSchema</code> and we are almost done writing the ingestion spec.</p>
+<p>There are some additional properties we need to set in the <code>granularitySpec</code>:</p>
+<ul>
+<li>Type of granularitySpec: <code>uniform</code> and <code>arbitrary</code> are the two supported types. For this tutorial, we will use a <code>uniform</code> granularity spec, where all segments have uniform interval sizes (for example, all segments cover an hour's worth of data).</li>
+<li>The segment granularity: what size of time interval should a single segment contain data for? e.g., <code>DAY</code>, <code>WEEK</code></li>
+<li>The bucketing granularity of the timestamps in the time column (referred to as <code>queryGranularity</code>)</li>
+</ul>
+<h4><a class="anchor" aria-hidden="true" id="segment-granularity"></a><a href="#segment-granularity" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Segment granularity</h4>
+<p>Segment granularity is configured by the <code>segmentGranularity</code> property in the <code>granularitySpec</code>. For this tutorial, we'll create hourly segments:</p>
+<pre><code class="hljs css language-json">"dataSchema" : {
+  "dataSource" : "ingestion-tutorial",
+  "timestampSpec" : {
+    "format" : "iso",
+    "column" : "ts"
+  },
+  "dimensionsSpec" : {
+    "dimensions": [
+      "srcIP",
+      { "name" : "srcPort", "type" : "long" },
+      { "name" : "dstIP", "type" : "string" },
+      { "name" : "dstPort", "type" : "long" },
+      { "name" : "protocol", "type" : "string" }
+    ]
+  },
+  "metricsSpec" : [
+    { "type" : "count", "name" : "count" },
+    { "type" : "longSum", "name" : "packets", "fieldName" : "packets" },
+    { "type" : "longSum", "name" : "bytes", "fieldName" : "bytes" },
+    { "type" : "doubleSum", "name" : "cost", "fieldName" : "cost" }
+  ],
+  "granularitySpec" : {
+    "type" : "uniform",
+    "segmentGranularity" : "HOUR",
+    "rollup" : true
+  }
+}
+</code></pre>
+<p>Our input data has events from two separate hours, so this task will generate two segments.</p>
+<h4><a class="anchor" aria-hidden="true" id="query-granularity"></a><a href="#query-granularity" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Query granularity</h4>
+<p>The query granularity is configured by the <code>queryGranularity</code> property in the <code>granularitySpec</code>. For this tutorial, let's use minute granularity:</p>
+<pre><code class="hljs css language-json">"dataSchema" : {
+  "dataSource" : "ingestion-tutorial",
+  "timestampSpec" : {
+    "format" : "iso",
+    "column" : "ts"
+  },
+  "dimensionsSpec" : {
+    "dimensions": [
+      "srcIP",
+      { "name" : "srcPort", "type" : "long" },
+      { "name" : "dstIP", "type" : "string" },
+      { "name" : "dstPort", "type" : "long" },
+      { "name" : "protocol", "type" : "string" }
+    ]
+  },
+  "metricsSpec" : [
+    { "type" : "count", "name" : "count" },
+    { "type" : "longSum", "name" : "packets", "fieldName" : "packets" },
+    { "type" : "longSum", "name" : "bytes", "fieldName" : "bytes" },
+    { "type" : "doubleSum", "name" : "cost", "fieldName" : "cost" }
+  ],
+  "granularitySpec" : {
+    "type" : "uniform",
+    "segmentGranularity" : "HOUR",
+    "queryGranularity" : "MINUTE",
+    "rollup" : true
+  }
+}
+</code></pre>
+<p>To see the effect of the query granularity, let's look at this row from the raw input data:</p>
+<pre><code class="hljs css language-json">{<span class="hljs-attr">"ts"</span>:<span class="hljs-string">"2018-01-01T01:03:29Z"</span>,<span class="hljs-attr">"srcIP"</span>:<span class="hljs-string">"1.1.1.1"</span>, <span class="hljs-attr">"dstIP"</span>:<span class="hljs-string">"2.2.2.2"</span>, <span class="hljs-attr">"srcPort"</span>:<span class="hljs-number">5000</span>, <span class="hljs-attr">"dstPort"</span>:<span class="hljs-number">7000</span>, <span class="hljs-attr">"protocol"</span>: <span class="hljs-number">6</span>, <span class="hljs-attr">"packets"</span>:<span class="hljs-number">60</span>, <span class="hljs-attr">"bytes"</span>:<span class="hljs-number">6000</span>, <span class="hljs-attr">"cost"</span>: <span class="hljs-number">4.3</span>}
+</code></pre>
+<p>When this row is ingested with minute queryGranularity, Druid will floor the row's timestamp to minute buckets:</p>
+<pre><code class="hljs css language-json">{<span class="hljs-attr">"ts"</span>:<span class="hljs-string">"2018-01-01T01:03:00Z"</span>,<span class="hljs-attr">"srcIP"</span>:<span class="hljs-string">"1.1.1.1"</span>, <span class="hljs-attr">"dstIP"</span>:<span class="hljs-string">"2.2.2.2"</span>, <span class="hljs-attr">"srcPort"</span>:<span class="hljs-number">5000</span>, <span class="hljs-attr">"dstPort"</span>:<span class="hljs-number">7000</span>, <span class="hljs-attr">"protocol"</span>: <span class="hljs-number">6</span>, <span class="hljs-attr">"packets"</span>:<span class="hljs-number">60</span>, <span class="hljs-attr">"bytes"</span>:<span class="hljs-number">6000</span>, <span class="hljs-attr">"cost"</span>: <span class="hljs-number">4.3</span>}
+</code></pre>
+<h4><a class="anchor" aria-hidden="true" id="define-an-interval-batch-only"></a><a href="#define-an-interval-batch-only" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Define an interval (batch only)</h4>
+<p>For batch tasks, it is necessary to define a time interval. Input rows with timestamps outside of the time interval will not be ingested.</p>
+<p>The interval is also specified in the <code>granularitySpec</code>:</p>
+<pre><code class="hljs css language-json">"dataSchema" : {
+  "dataSource" : "ingestion-tutorial",
+  "timestampSpec" : {
+    "format" : "iso",
+    "column" : "ts"
+  },
+  "dimensionsSpec" : {
+    "dimensions": [
+      "srcIP",
+      { "name" : "srcPort", "type" : "long" },
+      { "name" : "dstIP", "type" : "string" },
+      { "name" : "dstPort", "type" : "long" },
+      { "name" : "protocol", "type" : "string" }
+    ]
+  },
+  "metricsSpec" : [
+    { "type" : "count", "name" : "count" },
+    { "type" : "longSum", "name" : "packets", "fieldName" : "packets" },
+    { "type" : "longSum", "name" : "bytes", "fieldName" : "bytes" },
+    { "type" : "doubleSum", "name" : "cost", "fieldName" : "cost" }
+  ],
+  "granularitySpec" : {
+    "type" : "uniform",
+    "segmentGranularity" : "HOUR",
+    "queryGranularity" : "MINUTE",
+    "intervals" : ["2018-01-01/2018-01-02"],
+    "rollup" : true
+  }
+}
+</code></pre>
+<h2><a class="anchor" aria-hidden="true" id="define-the-task-type"></a><a href="#define-the-task-type" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Define the task type</h2>
+<p>We've now finished defining our <code>dataSchema</code>. The remaining steps are to place the <code>dataSchema</code> we created into an ingestion task spec, and specify the input source.</p>
+<p>The <code>dataSchema</code> is shared across all task types, but each task type has its own specification format. For this tutorial, we will use the native batch ingestion task:</p>
+<pre><code class="hljs css language-json">{
+  <span class="hljs-attr">"type"</span> : <span class="hljs-string">"index_parallel"</span>,
+  <span class="hljs-attr">"spec"</span> : {
+    <span class="hljs-attr">"dataSchema"</span> : {
+      <span class="hljs-attr">"dataSource"</span> : <span class="hljs-string">"ingestion-tutorial"</span>,
+      <span class="hljs-attr">"timestampSpec"</span> : {
+        <span class="hljs-attr">"format"</span> : <span class="hljs-string">"iso"</span>,
+        <span class="hljs-attr">"column"</span> : <span class="hljs-string">"ts"</span>
+      },
+      <span class="hljs-attr">"dimensionsSpec"</span> : {
+        <span class="hljs-attr">"dimensions"</span>: [
+          <span class="hljs-string">"srcIP"</span>,
+          { <span class="hljs-attr">"name"</span> : <span class="hljs-string">"srcPort"</span>, <span class="hljs-attr">"type"</span> : <span class="hljs-string">"long"</span> },
+          { <span class="hljs-attr">"name"</span> : <span class="hljs-string">"dstIP"</span>, <span class="hljs-attr">"type"</span> : <span class="hljs-string">"string"</span> },
+          { <span class="hljs-attr">"name"</span> : <span class="hljs-string">"dstPort"</span>, <span class="hljs-attr">"type"</span> : <span class="hljs-string">"long"</span> },
+          { <span class="hljs-attr">"name"</span> : <span class="hljs-string">"protocol"</span>, <span class="hljs-attr">"type"</span> : <span class="hljs-string">"string"</span> }
+        ]
+      },
+      <span class="hljs-attr">"metricsSpec"</span> : [
+        { <span class="hljs-attr">"type"</span> : <span class="hljs-string">"count"</span>, <span class="hljs-attr">"name"</span> : <span class="hljs-string">"count"</span> },
+        { <span class="hljs-attr">"type"</span> : <span class="hljs-string">"longSum"</span>, <span class="hljs-attr">"name"</span> : <span class="hljs-string">"packets"</span>, <span class="hljs-attr">"fieldName"</span> : <span class="hljs-string">"packets"</span> },
+        { <span class="hljs-attr">"type"</span> : <span class="hljs-string">"longSum"</span>, <span class="hljs-attr">"name"</span> : <span class="hljs-string">"bytes"</span>, <span class="hljs-attr">"fieldName"</span> : <span class="hljs-string">"bytes"</span> },
+        { <span class="hljs-attr">"type"</span> : <span class="hljs-string">"doubleSum"</span>, <span class="hljs-attr">"name"</span> : <span class="hljs-string">"cost"</span>, <span class="hljs-attr">"fieldName"</span> : <span class="hljs-string">"cost"</span> }
+      ],
+      <span class="hljs-attr">"granularitySpec"</span> : {
+        <span class="hljs-attr">"type"</span> : <span class="hljs-string">"uniform"</span>,
+        <span class="hljs-attr">"segmentGranularity"</span> : <span class="hljs-string">"HOUR"</span>,
+        <span class="hljs-attr">"queryGranularity"</span> : <span class="hljs-string">"MINUTE"</span>,
+        <span class="hljs-attr">"intervals"</span> : [<span class="hljs-string">"2018-01-01/2018-01-02"</span>],
+        <span class="hljs-attr">"rollup"</span> : <span class="hljs-literal">true</span>
+      }
+    }
+  }
+}
+</code></pre>
+<h2><a class="anchor" aria-hidden="true" id="define-the-input-source"></a><a href="#define-the-input-source" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Define the input source</h2>
+<p>Now let's define our input source, which is specified in an <code>ioConfig</code> object. Each task type has its own type of <code>ioConfig</code>. To read input data, we need to specify an <code>inputSource</code>. The example netflow data we saved earlier needs to be read from a local file, which is configured below:</p>
+<pre><code class="hljs css language-json">    "ioConfig" : {
+      "type" : "index_parallel",
+      "inputSource" : {
+        "type" : "local",
+        "baseDir" : "quickstart/",
+        "filter" : "ingestion-tutorial-data.json"
+      }
+    }
+</code></pre>
+<h3><a class="anchor" aria-hidden="true" id="define-the-format-of-the-data"></a><a href="#define-the-format-of-the-data" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Define the format of the data</h3>
+<p>Since our input data is represented as JSON strings, we'll use a <code>inputFormat</code> to <code>json</code> format:</p>
+<pre><code class="hljs css language-json">    "ioConfig" : {
+      "type" : "index_parallel",
+      "inputSource" : {
+        "type" : "local",
+        "baseDir" : "quickstart/",
+        "filter" : "ingestion-tutorial-data.json"
+      },
+      "inputFormat" : {
+        "type" : "json"
+      }
+    }
+</code></pre>
+<pre><code class="hljs css language-json">{
+  <span class="hljs-attr">"type"</span> : <span class="hljs-string">"index_parallel"</span>,
+  <span class="hljs-attr">"spec"</span> : {
+    <span class="hljs-attr">"dataSchema"</span> : {
+      <span class="hljs-attr">"dataSource"</span> : <span class="hljs-string">"ingestion-tutorial"</span>,
+      <span class="hljs-attr">"timestampSpec"</span> : {
+        <span class="hljs-attr">"format"</span> : <span class="hljs-string">"iso"</span>,
+        <span class="hljs-attr">"column"</span> : <span class="hljs-string">"ts"</span>
+      },
+      <span class="hljs-attr">"dimensionsSpec"</span> : {
+        <span class="hljs-attr">"dimensions"</span>: [
+          <span class="hljs-string">"srcIP"</span>,
+          { <span class="hljs-attr">"name"</span> : <span class="hljs-string">"srcPort"</span>, <span class="hljs-attr">"type"</span> : <span class="hljs-string">"long"</span> },
+          { <span class="hljs-attr">"name"</span> : <span class="hljs-string">"dstIP"</span>, <span class="hljs-attr">"type"</span> : <span class="hljs-string">"string"</span> },
+          { <span class="hljs-attr">"name"</span> : <span class="hljs-string">"dstPort"</span>, <span class="hljs-attr">"type"</span> : <span class="hljs-string">"long"</span> },
+          { <span class="hljs-attr">"name"</span> : <span class="hljs-string">"protocol"</span>, <span class="hljs-attr">"type"</span> : <span class="hljs-string">"string"</span> }
+        ]
+      },
+      <span class="hljs-attr">"metricsSpec"</span> : [
+        { <span class="hljs-attr">"type"</span> : <span class="hljs-string">"count"</span>, <span class="hljs-attr">"name"</span> : <span class="hljs-string">"count"</span> },
+        { <span class="hljs-attr">"type"</span> : <span class="hljs-string">"longSum"</span>, <span class="hljs-attr">"name"</span> : <span class="hljs-string">"packets"</span>, <span class="hljs-attr">"fieldName"</span> : <span class="hljs-string">"packets"</span> },
+        { <span class="hljs-attr">"type"</span> : <span class="hljs-string">"longSum"</span>, <span class="hljs-attr">"name"</span> : <span class="hljs-string">"bytes"</span>, <span class="hljs-attr">"fieldName"</span> : <span class="hljs-string">"bytes"</span> },
+        { <span class="hljs-attr">"type"</span> : <span class="hljs-string">"doubleSum"</span>, <span class="hljs-attr">"name"</span> : <span class="hljs-string">"cost"</span>, <span class="hljs-attr">"fieldName"</span> : <span class="hljs-string">"cost"</span> }
+      ],
+      <span class="hljs-attr">"granularitySpec"</span> : {
+        <span class="hljs-attr">"type"</span> : <span class="hljs-string">"uniform"</span>,
+        <span class="hljs-attr">"segmentGranularity"</span> : <span class="hljs-string">"HOUR"</span>,
+        <span class="hljs-attr">"queryGranularity"</span> : <span class="hljs-string">"MINUTE"</span>,
+        <span class="hljs-attr">"intervals"</span> : [<span class="hljs-string">"2018-01-01/2018-01-02"</span>],
+        <span class="hljs-attr">"rollup"</span> : <span class="hljs-literal">true</span>
+      }
+    },
+    <span class="hljs-attr">"ioConfig"</span> : {
+      <span class="hljs-attr">"type"</span> : <span class="hljs-string">"index_parallel"</span>,
+      <span class="hljs-attr">"inputSource"</span> : {
+        <span class="hljs-attr">"type"</span> : <span class="hljs-string">"local"</span>,
+        <span class="hljs-attr">"baseDir"</span> : <span class="hljs-string">"quickstart/"</span>,
+        <span class="hljs-attr">"filter"</span> : <span class="hljs-string">"ingestion-tutorial-data.json"</span>
+      },
+      <span class="hljs-attr">"inputFormat"</span> : {
+        <span class="hljs-attr">"type"</span> : <span class="hljs-string">"json"</span>
+      }
+    }
+  }
+}
+</code></pre>
+<h2><a class="anchor" aria-hidden="true" id="additional-tuning"></a><a href="#additional-tuning" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Additional tuning</h2>
+<p>Each ingestion task has a <code>tuningConfig</code> section that allows users to tune various ingestion parameters.</p>
+<p>As an example, let's add a <code>tuningConfig</code> that sets a target segment size for the native batch ingestion task:</p>
+<pre><code class="hljs css language-json">    "tuningConfig" : {
+      "type" : "index_parallel",
+      "maxRowsPerSegment" : 5000000
+    }
+</code></pre>
+<p>Note that each ingestion task has its own type of <code>tuningConfig</code>.</p>
+<h2><a class="anchor" aria-hidden="true" id="final-spec"></a><a href="#final-spec" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Final spec</h2>
+<p>We've finished defining the ingestion spec, it should now look like the following:</p>
+<pre><code class="hljs css language-json">{
+  <span class="hljs-attr">"type"</span> : <span class="hljs-string">"index_parallel"</span>,
+  <span class="hljs-attr">"spec"</span> : {
+    <span class="hljs-attr">"dataSchema"</span> : {
+      <span class="hljs-attr">"dataSource"</span> : <span class="hljs-string">"ingestion-tutorial"</span>,
+      <span class="hljs-attr">"timestampSpec"</span> : {
+        <span class="hljs-attr">"format"</span> : <span class="hljs-string">"iso"</span>,
+        <span class="hljs-attr">"column"</span> : <span class="hljs-string">"ts"</span>
+      },
+      <span class="hljs-attr">"dimensionsSpec"</span> : {
+        <span class="hljs-attr">"dimensions"</span>: [
+          <span class="hljs-string">"srcIP"</span>,
+          { <span class="hljs-attr">"name"</span> : <span class="hljs-string">"srcPort"</span>, <span class="hljs-attr">"type"</span> : <span class="hljs-string">"long"</span> },
+          { <span class="hljs-attr">"name"</span> : <span class="hljs-string">"dstIP"</span>, <span class="hljs-attr">"type"</span> : <span class="hljs-string">"string"</span> },
+          { <span class="hljs-attr">"name"</span> : <span class="hljs-string">"dstPort"</span>, <span class="hljs-attr">"type"</span> : <span class="hljs-string">"long"</span> },
+          { <span class="hljs-attr">"name"</span> : <span class="hljs-string">"protocol"</span>, <span class="hljs-attr">"type"</span> : <span class="hljs-string">"string"</span> }
+        ]
+      },
+      <span class="hljs-attr">"metricsSpec"</span> : [
+        { <span class="hljs-attr">"type"</span> : <span class="hljs-string">"count"</span>, <span class="hljs-attr">"name"</span> : <span class="hljs-string">"count"</span> },
+        { <span class="hljs-attr">"type"</span> : <span class="hljs-string">"longSum"</span>, <span class="hljs-attr">"name"</span> : <span class="hljs-string">"packets"</span>, <span class="hljs-attr">"fieldName"</span> : <span class="hljs-string">"packets"</span> },
+        { <span class="hljs-attr">"type"</span> : <span class="hljs-string">"longSum"</span>, <span class="hljs-attr">"name"</span> : <span class="hljs-string">"bytes"</span>, <span class="hljs-attr">"fieldName"</span> : <span class="hljs-string">"bytes"</span> },
+        { <span class="hljs-attr">"type"</span> : <span class="hljs-string">"doubleSum"</span>, <span class="hljs-attr">"name"</span> : <span class="hljs-string">"cost"</span>, <span class="hljs-attr">"fieldName"</span> : <span class="hljs-string">"cost"</span> }
+      ],
+      <span class="hljs-attr">"granularitySpec"</span> : {
+        <span class="hljs-attr">"type"</span> : <span class="hljs-string">"uniform"</span>,
+        <span class="hljs-attr">"segmentGranularity"</span> : <span class="hljs-string">"HOUR"</span>,
+        <span class="hljs-attr">"queryGranularity"</span> : <span class="hljs-string">"MINUTE"</span>,
+        <span class="hljs-attr">"intervals"</span> : [<span class="hljs-string">"2018-01-01/2018-01-02"</span>],
+        <span class="hljs-attr">"rollup"</span> : <span class="hljs-literal">true</span>
+      }
+    },
+    <span class="hljs-attr">"ioConfig"</span> : {
+      <span class="hljs-attr">"type"</span> : <span class="hljs-string">"index_parallel"</span>,
+      <span class="hljs-attr">"inputSource"</span> : {
+        <span class="hljs-attr">"type"</span> : <span class="hljs-string">"local"</span>,
+        <span class="hljs-attr">"baseDir"</span> : <span class="hljs-string">"quickstart/"</span>,
+        <span class="hljs-attr">"filter"</span> : <span class="hljs-string">"ingestion-tutorial-data.json"</span>
+      },
+      <span class="hljs-attr">"inputFormat"</span> : {
+        <span class="hljs-attr">"type"</span> : <span class="hljs-string">"json"</span>
+      }
+    },
+    <span class="hljs-attr">"tuningConfig"</span> : {
+      <span class="hljs-attr">"type"</span> : <span class="hljs-string">"index_parallel"</span>,
+      <span class="hljs-attr">"maxRowsPerSegment"</span> : <span class="hljs-number">5000000</span>
+    }
+  }
+}
+</code></pre>
+<h2><a class="anchor" aria-hidden="true" id="submit-the-task-and-query-the-data"></a><a href="#submit-the-task-and-query-the-data" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Submit the task and query the data</h2>
+<p>From the apache-druid-0.20.0 package root, run the following command:</p>
+<pre><code class="hljs css language-bash">bin/post-index-task --file quickstart/ingestion-tutorial-index.json --url http://localhost:8081
+</code></pre>
+<p>After the script completes, we will query the data.</p>
+<p>Let's run <code>bin/dsql</code> and issue a <code>select * from &quot;ingestion-tutorial&quot;;</code> query to see what data was ingested.</p>
+<pre><code class="hljs css language-bash">$ bin/dsql
+Welcome to dsql, the <span class="hljs-built_in">command</span>-line client <span class="hljs-keyword">for</span> Druid SQL.
+Type <span class="hljs-string">"\h"</span> <span class="hljs-keyword">for</span> <span class="hljs-built_in">help</span>.
+dsql&gt; select * from <span class="hljs-string">"ingestion-tutorial"</span>;
+
+┌──────────────────────────┬───────┬──────┬───────┬─────────┬─────────┬─────────┬──────────┬─────────┬─────────┐
+│ __time                   │ bytes │ cost │ count │ dstIP   │ dstPort │ packets │ protocol │ srcIP   │ srcPort │
+├──────────────────────────┼───────┼──────┼───────┼─────────┼─────────┼─────────┼──────────┼─────────┼─────────┤
+│ 2018-01-01T01:01:00.000Z │  6000 │  4.9 │     3 │ 2.2.2.2 │    3000 │      60 │ 6        │ 1.1.1.1 │    2000 │
+│ 2018-01-01T01:02:00.000Z │  9000 │ 18.1 │     2 │ 2.2.2.2 │    7000 │      90 │ 6        │ 1.1.1.1 │    5000 │
+│ 2018-01-01T01:03:00.000Z │  6000 │  4.3 │     1 │ 2.2.2.2 │    7000 │      60 │ 6        │ 1.1.1.1 │    5000 │
+│ 2018-01-01T02:33:00.000Z │ 30000 │ 56.9 │     2 │ 8.8.8.8 │    5000 │     300 │ 17       │ 7.7.7.7 │    4000 │
+│ 2018-01-01T02:35:00.000Z │ 30000 │ 46.3 │     1 │ 8.8.8.8 │    5000 │     300 │ 17       │ 7.7.7.7 │    4000 │
+└──────────────────────────┴───────┴──────┴───────┴─────────┴─────────┴─────────┴──────────┴─────────┴─────────┘
+Retrieved 5 rows <span class="hljs-keyword">in</span> 0.12s.
+
+dsql&gt;
+</code></pre>
+</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/0.20.0/tutorials/tutorial-delete-data.html"><span class="arrow-prev">← </span><span>Deleting data</span></a><a class="docs-next button" href="/docs/0.20.0/tutorials/tutorial-transform-spec.html"><span>Transforming input data</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#example-data">Example data</a></li><li><a href="#defining-the-schema">Defining the schema</a><ul class="toc-headings"><li><a href="#datasource-name">Datasource name</a></li><li><a href="#time-column">Time column</a></li><li><a href="#column-types">Column types</a></li><li><a href="#rollup">Rollup</a></li><li><a href="#no-rollup">No rollup</a></li><li><a href="#define-granularities">Define granularities</a></li></ul></li><li><a href="#define-the-task-type">Define the task type</a></li><li><a href="#define-the-input-source">Define the input source</a><ul class="toc-headings"><li><a href="#define-the-format-of-the-data">Define the format of the data</a></li></ul></li><li><a href="#additional-tuning">Additional tuning</a></li><li><a href="#final-spec">Final spec</a></li><li><a href="#submit-the-task-and-query-the-data">Submit the task and query the data</a></li></ul></nav></div><footer class="nav-footer druid-footer" id="footer"><div class="container"><div class="text-center"><p><a href="/technology">Technology</a> · <a href="/use-cases">Use Cases</a> · <a href="/druid-powered">Powered by Druid</a> · <a href="/docs/0.20.0/latest">Docs</a> · <a href="/community/">Community</a> · <a href="/downloads.html">Download</a> · <a href="/faq">FAQ</a></p></div><div class="text-center"><a title="Join the user group" href="https://groups.google.com/forum/#!forum/druid-user" target="_blank"><span class="fa fa-comments"></span></a> · <a title="Follow Druid" href="https://twitter.com/druidio" target="_blank"><span class="fab fa-twitter"></span></a> · <a title="Download via Apache" href="https://www.apache.org/dyn/closer.cgi?path=/incubator/druid/{{ site.druid_versions[0].versions[0].version }}/apache-druid-{{ site.druid_versions[0].versions[0].version }}-bin.tar.gz" target="_blank"><span class="fas fa-feather"></span></a> · <a title="GitHub" href="https://github.com/apache/druid" target="_blank"><span class="fab fa-github"></span></a></div><div class="text-center license">Copyright © 2019 <a href="https://www.apache.org/" target="_blank">Apache Software Foundation</a>.<br/>Except where otherwise noted, licensed under <a rel="license" href="http://creativecommons.org/licenses/by-sa/4.0/">CC BY-SA 4.0</a>.<br/>Apache Druid, Druid, and the Druid logo are either registered trademarks or trademarks of The Apache Software Foundation in the United States and other countries.</div></div></footer></div><script type="text/javascript" src="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.js"></script><script>
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+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Tutorial: Load streaming data from Apache Kafka · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/0.20.0/tutorials/tutorial-kafka.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.20.0" /><meta property="og:title" content="Tutorial: Load streaming data from Apache Kafka · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
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+  ~ Licensed to the Apache Software Foundation (ASF) under one
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+<h2><a class="anchor" aria-hidden="true" id="getting-started"></a><a href="#getting-started" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Getting started</h2>
+<p>This tutorial demonstrates how to load data into Apache Druid from a Kafka stream, using Druid's Kafka indexing service.</p>
+<p>For this tutorial, we'll assume you've already downloaded Druid as described in
+the <a href="index.html">quickstart</a> using the <code>micro-quickstart</code> single-machine configuration and have it
+running on your local machine. You don't need to have loaded any data yet.</p>
+<h2><a class="anchor" aria-hidden="true" id="download-and-start-kafka"></a><a href="#download-and-start-kafka" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Download and start Kafka</h2>
+<p><a href="http://kafka.apache.org/">Apache Kafka</a> is a high throughput message bus that works well with
+Druid.  For this tutorial, we will use Kafka 2.6.0. To download Kafka, issue the following
+commands in your terminal:</p>
+<pre><code class="hljs css language-bash">curl -O https://archive.apache.org/dist/kafka/2.6.0/kafka_2.13-2.6.0.tgz
+tar -xzf kafka_2.13-2.6.0.tgz
+<span class="hljs-built_in">cd</span> kafka_2.13-2.6.0
+</code></pre>
+<p>Start a Kafka broker by running the following command in a new terminal:</p>
+<pre><code class="hljs css language-bash">./bin/kafka-server-start.sh config/server.properties
+</code></pre>
+<p>Run this command to create a Kafka topic called <em>wikipedia</em>, to which we'll send data:</p>
+<pre><code class="hljs css language-bash">./bin/kafka-topics.sh --create --topic wikipedia --bootstrap-server localhost:9092
+</code></pre>
+<h2><a class="anchor" aria-hidden="true" id="load-data-into-kafka"></a><a href="#load-data-into-kafka" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Load data into Kafka</h2>
+<p>Let's launch a producer for our topic and send some data!</p>
+<p>In your Druid directory, run the following command:</p>
+<pre><code class="hljs css language-bash"><span class="hljs-built_in">cd</span> quickstart/tutorial
+gunzip -c wikiticker-2015-09-12-sampled.json.gz &gt; wikiticker-2015-09-12-sampled.json
+</code></pre>
+<p>In your Kafka directory, run the following command, where {PATH_TO_DRUID} is replaced by the path to the Druid directory:</p>
+<pre><code class="hljs css language-bash"><span class="hljs-built_in">export</span> KAFKA_OPTS=<span class="hljs-string">"-Dfile.encoding=UTF-8"</span>
+./bin/kafka-console-producer.sh --broker-list localhost:9092 --topic wikipedia &lt; {PATH_TO_DRUID}/quickstart/tutorial/wikiticker-2015-09-12-sampled.json
+</code></pre>
+<p>The previous command posted sample events to the <em>wikipedia</em> Kafka topic.
+Now we will use Druid's Kafka indexing service to ingest messages from our newly created topic.</p>
+<h2><a class="anchor" aria-hidden="true" id="loading-data-with-the-data-loader"></a><a href="#loading-data-with-the-data-loader" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Loading data with the data loader</h2>
+<p>Navigate to <a href="http://localhost:8888">localhost:8888</a> and click <code>Load data</code> in the console header.</p>
+<p><img src="../assets/tutorial-kafka-data-loader-01.png" alt="Data loader init" title="Data loader init"></p>
+<p>Select <code>Apache Kafka</code> and click <code>Connect data</code>.</p>
+<p><img src="../assets/tutorial-kafka-data-loader-02.png" alt="Data loader sample" title="Data loader sample"></p>
+<p>Enter <code>localhost:9092</code> as the bootstrap server and <code>wikipedia</code> as the topic.</p>
+<p>Click <code>Apply</code> and make sure that the data you are seeing is correct.</p>
+<p>Once the data is located, you can click &quot;Next: Parse data&quot; to go to the next step.</p>
+<p><img src="../assets/tutorial-kafka-data-loader-03.png" alt="Data loader parse data" title="Data loader parse data"></p>
+<p>The data loader will try to automatically determine the correct parser for the data.
+In this case it will successfully determine <code>json</code>.
+Feel free to play around with different parser options to get a preview of how Druid will parse your data.</p>
+<p>With the <code>json</code> parser selected, click <code>Next: Parse time</code> to get to the step centered around determining your primary timestamp column.</p>
+<p><img src="../assets/tutorial-kafka-data-loader-04.png" alt="Data loader parse time" title="Data loader parse time"></p>
+<p>Druid's architecture requires a primary timestamp column (internally stored in a column called <code>__time</code>).
+If you do not have a timestamp in your data, select <code>Constant value</code>.
+In our example, the data loader will determine that the <code>time</code> column in our raw data is the only candidate that can be used as the primary time column.</p>
+<p>Click <code>Next: ...</code> twice to go past the <code>Transform</code> and <code>Filter</code> steps.
+You do not need to enter anything in these steps as applying ingestion time transforms and filters are out of scope for this tutorial.</p>
+<p><img src="../assets/tutorial-kafka-data-loader-05.png" alt="Data loader schema" title="Data loader schema"></p>
+<p>In the <code>Configure schema</code> step, you can configure which <a href="/docs/0.20.0/ingestion/index.html#dimensions">dimensions</a> and <a href="/docs/0.20.0/ingestion/index.html#metrics">metrics</a> will be ingested into Druid.
+This is exactly what the data will appear like in Druid once it is ingested.
+Since our dataset is very small, go ahead and turn off <a href="/docs/0.20.0/ingestion/index.html#rollup"><code>Rollup</code></a> by clicking on the switch and confirming the change.</p>
+<p>Once you are satisfied with the schema, click <code>Next</code> to go to the <code>Partition</code> step where you can fine tune how the data will be partitioned into segments.</p>
+<p><img src="../assets/tutorial-kafka-data-loader-06.png" alt="Data loader partition" title="Data loader partition"></p>
+<p>Here, you can adjust how the data will be split up into segments in Druid.
+Since this is a small dataset, there are no adjustments that need to be made in this step.</p>
+<p>Click <code>Next: Tune</code> to go to the tuning step.</p>
+<p><img src="../assets/tutorial-kafka-data-loader-07.png" alt="Data loader tune" title="Data loader tune"></p>
+<p>In the <code>Tune</code> step is it <em>very important</em> to set <code>Use earliest offset</code> to <code>True</code> since we want to consume the data from the start of the stream.
+There are no other changes that need to be made here, so click <code>Next: Publish</code> to go to the <code>Publish</code> step.</p>
+<p><img src="../assets/tutorial-kafka-data-loader-08.png" alt="Data loader publish" title="Data loader publish"></p>
+<p>Let's name this datasource <code>wikipedia-kafka</code>.</p>
+<p>Finally, click <code>Next</code> to review your spec.</p>
+<p><img src="../assets/tutorial-kafka-data-loader-09.png" alt="Data loader spec" title="Data loader spec"></p>
+<p>This is the spec you have constructed.
+Feel free to go back and make changes in previous steps to see how changes will update the spec.
+Similarly, you can also edit the spec directly and see it reflected in the previous steps.</p>
+<p>Once you are satisfied with the spec, click <code>Submit</code> and an ingestion task will be created.</p>
+<p><img src="../assets/tutorial-kafka-data-loader-10.png" alt="Tasks view" title="Tasks view"></p>
+<p>You will be taken to the task view with the focus on the newly created supervisor.</p>
+<p>The task view is set to auto refresh, wait until your supervisor launches a task.</p>
+<p>When a tasks starts running, it will also start serving the data that it is ingesting.</p>
+<p>Navigate to the <code>Datasources</code> view from the header.</p>
+<p><img src="../assets/tutorial-kafka-data-loader-11.png" alt="Datasource view" title="Datasource view"></p>
+<p>When the <code>wikipedia-kafka</code> datasource appears here it can be queried.</p>
+<p><em>Note:</em> if the datasource does not appear after a minute you might have not set the supervisor to read from the start of the stream (in the <code>Tune</code> step).</p>
+<p>At this point, you can go to the <code>Query</code> view to run SQL queries against the datasource.</p>
+<p>Since this is a small dataset, you can simply run a <code>SELECT * FROM &quot;wikipedia-kafka&quot;</code> query to see your results.</p>
+<p><img src="../assets/tutorial-kafka-data-loader-12.png" alt="Query view" title="Query view"></p>
+<p>Check out the <a href="/docs/0.20.0/tutorials/tutorial-query.html">query tutorial</a> to run some example queries on the newly loaded data.</p>
+<h3><a class="anchor" aria-hidden="true" id="submit-a-supervisor-via-the-console"></a><a href="#submit-a-supervisor-via-the-console" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Submit a supervisor via the console</h3>
+<p>In the console, click <code>Submit supervisor</code> to open the submit supervisor dialog.</p>
+<p><img src="../assets/tutorial-kafka-submit-supervisor-01.png" alt="Submit supervisor" title="Submit supervisor"></p>
+<p>Paste in this spec and click <code>Submit</code>.</p>
+<pre><code class="hljs css language-json">{
+  <span class="hljs-attr">"type"</span>: <span class="hljs-string">"kafka"</span>,
+  <span class="hljs-attr">"spec"</span> : {
+    <span class="hljs-attr">"dataSchema"</span>: {
+      <span class="hljs-attr">"dataSource"</span>: <span class="hljs-string">"wikipedia"</span>,
+      <span class="hljs-attr">"timestampSpec"</span>: {
+        <span class="hljs-attr">"column"</span>: <span class="hljs-string">"time"</span>,
+        <span class="hljs-attr">"format"</span>: <span class="hljs-string">"auto"</span>
+      },
+      <span class="hljs-attr">"dimensionsSpec"</span>: {
+        <span class="hljs-attr">"dimensions"</span>: [
+          <span class="hljs-string">"channel"</span>,
+          <span class="hljs-string">"cityName"</span>,
+          <span class="hljs-string">"comment"</span>,
+          <span class="hljs-string">"countryIsoCode"</span>,
+          <span class="hljs-string">"countryName"</span>,
+          <span class="hljs-string">"isAnonymous"</span>,
+          <span class="hljs-string">"isMinor"</span>,
+          <span class="hljs-string">"isNew"</span>,
+          <span class="hljs-string">"isRobot"</span>,
+          <span class="hljs-string">"isUnpatrolled"</span>,
+          <span class="hljs-string">"metroCode"</span>,
+          <span class="hljs-string">"namespace"</span>,
+          <span class="hljs-string">"page"</span>,
+          <span class="hljs-string">"regionIsoCode"</span>,
+          <span class="hljs-string">"regionName"</span>,
+          <span class="hljs-string">"user"</span>,
+          { <span class="hljs-attr">"name"</span>: <span class="hljs-string">"added"</span>, <span class="hljs-attr">"type"</span>: <span class="hljs-string">"long"</span> },
+          { <span class="hljs-attr">"name"</span>: <span class="hljs-string">"deleted"</span>, <span class="hljs-attr">"type"</span>: <span class="hljs-string">"long"</span> },
+          { <span class="hljs-attr">"name"</span>: <span class="hljs-string">"delta"</span>, <span class="hljs-attr">"type"</span>: <span class="hljs-string">"long"</span> }
+        ]
+      },
+      <span class="hljs-attr">"metricsSpec"</span> : [],
+      <span class="hljs-attr">"granularitySpec"</span>: {
+        <span class="hljs-attr">"type"</span>: <span class="hljs-string">"uniform"</span>,
+        <span class="hljs-attr">"segmentGranularity"</span>: <span class="hljs-string">"DAY"</span>,
+        <span class="hljs-attr">"queryGranularity"</span>: <span class="hljs-string">"NONE"</span>,
+        <span class="hljs-attr">"rollup"</span>: <span class="hljs-literal">false</span>
+      }
+    },
+    <span class="hljs-attr">"tuningConfig"</span>: {
+      <span class="hljs-attr">"type"</span>: <span class="hljs-string">"kafka"</span>,
+      <span class="hljs-attr">"reportParseExceptions"</span>: <span class="hljs-literal">false</span>
+    },
+    <span class="hljs-attr">"ioConfig"</span>: {
+      <span class="hljs-attr">"topic"</span>: <span class="hljs-string">"wikipedia"</span>,
+      <span class="hljs-attr">"inputFormat"</span>: {
+        <span class="hljs-attr">"type"</span>: <span class="hljs-string">"json"</span>
+      },
+      <span class="hljs-attr">"replicas"</span>: <span class="hljs-number">2</span>,
+      <span class="hljs-attr">"taskDuration"</span>: <span class="hljs-string">"PT10M"</span>,
+      <span class="hljs-attr">"completionTimeout"</span>: <span class="hljs-string">"PT20M"</span>,
+      <span class="hljs-attr">"consumerProperties"</span>: {
+        <span class="hljs-attr">"bootstrap.servers"</span>: <span class="hljs-string">"localhost:9092"</span>
+      }
+    }
+  }
+}
+</code></pre>
+<p>This will start the supervisor that will in turn spawn some tasks that will start listening for incoming data.</p>
+<h3><a class="anchor" aria-hidden="true" id="submit-a-supervisor-directly"></a><a href="#submit-a-supervisor-directly" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Submit a supervisor directly</h3>
+<p>To start the service directly, we will need to submit a supervisor spec to the Druid overlord by running the following from the Druid package root:</p>
+<pre><code class="hljs css language-bash">curl -XPOST -H<span class="hljs-string">'Content-Type: application/json'</span> -d @quickstart/tutorial/wikipedia-kafka-supervisor.json http://localhost:8081/druid/indexer/v1/supervisor
+</code></pre>
+<p>If the supervisor was successfully created, you will get a response containing the ID of the supervisor; in our case we should see <code>{&quot;id&quot;:&quot;wikipedia&quot;}</code>.</p>
+<p>For more details about what's going on here, check out the
+<a href="/docs/0.20.0/development/extensions-core/kafka-ingestion.html">Druid Kafka indexing service documentation</a>.</p>
+<p>You can view the current supervisors and tasks in the Druid Console: <a href="http://localhost:8888/unified-console.html#tasks">http://localhost:8888/unified-console.html#tasks</a>.</p>
+<h2><a class="anchor" aria-hidden="true" id="querying-your-data"></a><a href="#querying-your-data" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Querying your data</h2>
+<p>After data is sent to the Kafka stream, it is immediately available for querying.</p>
+<p>Please follow the <a href="/docs/0.20.0/tutorials/tutorial-query.html">query tutorial</a> to run some example queries on the newly loaded data.</p>
+<h2><a class="anchor" aria-hidden="true" id="cleanup"></a><a href="#cleanup" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Cleanup</h2>
+<p>To go through any of the other ingestion tutorials, you will need to shut down the cluster and reset the cluster state by removing the contents of the <code>var</code> directory in the Druid home, as the other tutorials will write to the same &quot;wikipedia&quot; datasource.</p>
+<p>You should additionally clear out any Kafka state. Do so by shutting down the Kafka broker with CTRL-C before stopping ZooKeeper and the Druid services, and then deleting the Kafka log directory at <code>/tmp/kafka-logs</code>:</p>
+<pre><code class="hljs css language-bash">rm -rf /tmp/kafka-logs
+</code></pre>
+<h2><a class="anchor" aria-hidden="true" id="further-reading"></a><a href="#further-reading" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Further reading</h2>
+<p>For more information on loading data from Kafka streams, please see the <a href="/docs/0.20.0/development/extensions-core/kafka-ingestion.html">Druid Kafka indexing service documentation</a>.</p>
+</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/0.20.0/tutorials/tutorial-batch.html"><span class="arrow-prev">← </span><span>Loading files natively</span></a><a class="docs-next button" href="/docs/0.20.0/tutorials/tutorial-batch-hadoop.html"><span>Load from Apache Hadoop</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#getting-started">Getting started</a></li><li><a href="#download-and-start-kafka">Download and start Kafka</a></li><li><a href="#load-data-into-kafka">Load data into Kafka</a></li><li><a href="#loading-data-with-the-data-loader">Loading data with the data loader</a><ul class="toc-headings"><li><a href="#submit-a-supervisor-via-the-console">Submit a supervisor via the console</a></li><li><a href="#submit-a-supervisor-directly">Submit a supervisor directly</a></li></ul></li><li><a href="#querying-your-data">Querying your data</a></li><li><a href="#cleanup">Cleanup</a></li><li><a href="#further-reading">Further reading</a></li></ul></nav></div><footer class="nav-footer druid-footer" id="footer"><div class="container"><div class="text-center"><p><a href="/technology">Technology</a> · <a href="/use-cases">Use Cases</a> · <a href="/druid-powered">Powered by Druid</a> · <a href="/docs/0.20.0/latest">Docs</a> · <a href="/community/">Community</a> · <a href="/downloads.html">Download</a> · <a href="/faq">FAQ</a></p></div><div class="text-center"><a title="Join the user group" href="https://groups.google.com/forum/#!forum/druid-user" target="_blank"><span class="fa fa-comments"></span></a> · <a title="Follow Druid" href="https://twitter.com/druidio" target="_blank"><span class="fab fa-twitter"></span></a> · <a title="Download via Apache" href="https://www.apache.org/dyn/closer.cgi?path=/incubator/druid/{{ site.druid_versions[0].versions[0].version }}/apache-druid-{{ site.druid_versions[0].versions[0].version }}-bin.tar.gz" target="_blank"><span class="fas fa-feather"></span></a> · <a title="GitHub" href="https://github.com/apache/druid" target="_blank"><span class="fab fa-github"></span></a></div><div class="text-center license">Copyright © 2019 <a href="https://www.apache.org/" target="_blank">Apache Software Foundation</a>.<br/>Except where otherwise noted, licensed under <a rel="license" href="http://creativecommons.org/licenses/by-sa/4.0/">CC BY-SA 4.0</a>.<br/>Apache Druid, Druid, and the Druid logo are either registered trademarks or trademarks of The Apache Software Foundation in the United States and other countries.</div></div></footer></div><script type="text/javascript" src="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.js"></script><script>
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+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Configuring Apache Druid to use Kerberized Apache Hadoop as deep storage · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/0.20.0/tutorials/tutorial-kerberos-hadoop.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.20.0" /><meta property="og:title" content="Configuring Apache Druid to use Kerberized Apache Hadoop as deep storage · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
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UIs</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/operations/deep-storage-migration.html">Deep storage migration</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/operations/export-metadata.html">Export Metadata Tool</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/operations/metadata-migration.html">Metadata Migration</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/operations/segment-optimization.html">Segment Size Optimization</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/operations/use_sbt_to_build_fat_jar.html">Content for build.sbt</a></li></ul></div></ul></div><div class="navGroup"><h3 class="navGroupCategoryTitle collapsible">Development<span class="arrow"><svg width="24" height="24" viewBox="0 0 24 24"><path fill="#565656" d="M7.41 15.41L12 10.83l4.59 4.58L18 14l-6-6-6 6z"></path><path d="M0 0h24v24H0z" fill="none"></path></svg></span></h3><ul class="hide"><li 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+<h2><a class="anchor" aria-hidden="true" id="hadoop-setup"></a><a href="#hadoop-setup" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Hadoop Setup</h2>
+<p>Following are the configurations files required to be copied over to Druid conf folders:</p>
+<ol>
+<li>For HDFS as a deep storage, hdfs-site.xml, core-site.xml</li>
+<li>For ingestion, mapred-site.xml, yarn-site.xml</li>
+</ol>
+<h3><a class="anchor" aria-hidden="true" id="hdfs-folders-and-permissions"></a><a href="#hdfs-folders-and-permissions" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>HDFS Folders and permissions</h3>
+<ol>
+<li><p>Choose any folder name for the druid deep storage, for example 'druid'</p></li>
+<li><p>Create the folder in hdfs under the required parent folder. For example,
+<code>hdfs dfs -mkdir /druid</code>
+OR
+<code>hdfs dfs -mkdir /apps/druid</code></p></li>
+<li><p>Give druid processes appropriate permissions for the druid processes to access this folder. This would ensure that druid is able to create necessary folders like data and indexing_log in HDFS.
+For example, if druid processes run as user 'root', then</p>
+<p><code>hdfs dfs -chown root:root /apps/druid</code></p>
+<p>OR</p>
+<p><code>hdfs dfs -chmod 777 /apps/druid</code></p></li>
+</ol>
+<p>Druid creates necessary sub-folders to store data and index under this newly created folder.</p>
+<h2><a class="anchor" aria-hidden="true" id="druid-setup"></a><a href="#druid-setup" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Druid Setup</h2>
+<p>Edit common.runtime.properties at conf/druid/_common/common.runtime.properties to include the HDFS properties. Folders used for the location are same as the ones used for example above.</p>
+<h3><a class="anchor" aria-hidden="true" id="commonruntimeproperties"></a><a href="#commonruntimeproperties" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>common.runtime.properties</h3>
+<pre><code class="hljs css language-properties"><span class="hljs-comment"># Deep storage</span>
+<span class="hljs-comment">#</span>
+<span class="hljs-comment"># For HDFS:</span>
+<span class="hljs-meta">druid.storage.type</span>=<span class="hljs-string">hdfs</span>
+<span class="hljs-meta">druid.storage.storageDirectory</span>=<span class="hljs-string">/druid/segments</span>
+<span class="hljs-comment"># OR</span>
+<span class="hljs-comment"># druid.storage.storageDirectory=/apps/druid/segments</span>
+<span class="hljs-comment">
+#</span>
+<span class="hljs-comment"># Indexing service logs</span>
+<span class="hljs-comment">#</span>
+<span class="hljs-comment">
+# For HDFS:</span>
+<span class="hljs-meta">druid.indexer.logs.type</span>=<span class="hljs-string">hdfs</span>
+<span class="hljs-meta">druid.indexer.logs.directory</span>=<span class="hljs-string">/druid/indexing-logs</span>
+<span class="hljs-comment"># OR</span>
+<span class="hljs-comment"># druid.storage.storageDirectory=/apps/druid/indexing-logs</span>
+</code></pre>
+<p>Note: Comment out Local storage and S3 Storage parameters in the file</p>
+<p>Also include hdfs-storage core extension to <code>conf/druid/_common/common.runtime.properties</code></p>
+<pre><code class="hljs css language-properties"><span class="hljs-comment">#</span>
+<span class="hljs-comment"># Extensions</span>
+<span class="hljs-comment">#</span>
+
+<span class="hljs-meta">druid.extensions.directory</span>=<span class="hljs-string">dist/druid/extensions</span>
+<span class="hljs-meta">druid.extensions.hadoopDependenciesDir</span>=<span class="hljs-string">dist/druid/hadoop-dependencies</span>
+<span class="hljs-meta">druid.extensions.loadList</span>=<span class="hljs-string">["mysql-metadata-storage", "druid-hdfs-storage", "druid-kerberos"]</span>
+</code></pre>
+<h3><a class="anchor" aria-hidden="true" id="hadoop-jars"></a><a href="#hadoop-jars" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Hadoop Jars</h3>
+<p>Ensure that Druid has necessary jars to support the Hadoop version.</p>
+<p>Find the hadoop version using command, <code>hadoop version</code></p>
+<p>In case there is other software used with hadoop, like <code>WanDisco</code>, ensure that</p>
+<ol>
+<li>the necessary libraries are available</li>
+<li>add the requisite extensions to <code>druid.extensions.loadlist</code> in <code>conf/druid/_common/common.runtime.properties</code></li>
+</ol>
+<h3><a class="anchor" aria-hidden="true" id="kerberos-setup"></a><a href="#kerberos-setup" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Kerberos setup</h3>
+<p>Create a headless keytab which would have access to the druid data and index.</p>
+<p>Edit conf/druid/_common/common.runtime.properties and add the following properties:</p>
+<pre><code class="hljs css language-properties"><span class="hljs-attr">druid.hadoop.security.kerberos.principal</span>
+<span class="hljs-attr">druid.hadoop.security.kerberos.keytab</span>
+</code></pre>
+<p>For example</p>
+<pre><code class="hljs css language-properties"><span class="hljs-meta">druid.hadoop.security.kerberos.principal</span>=<span class="hljs-string">hdfs-test@EXAMPLE.IO</span>
+<span class="hljs-meta">druid.hadoop.security.kerberos.keytab</span>=<span class="hljs-string">/etc/security/keytabs/hdfs.headless.keytab</span>
+</code></pre>
+<h3><a class="anchor" aria-hidden="true" id="restart-druid-services"></a><a href="#restart-druid-services" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Restart Druid Services</h3>
+<p>With the above changes, restart Druid. This would ensure that Druid works with Kerberized Hadoop</p>
+</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/0.20.0/tutorials/tutorial-transform-spec.html"><span class="arrow-prev">← </span><span>Transforming input data</span></a><a class="docs-next button" href="/docs/0.20.0/design/architecture.html"><span>Design</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#hadoop-setup">Hadoop Setup</a><ul class="toc-headings"><li><a href="#hdfs-folders-and-permissions">HDFS Folders and permissions</a></li></ul></li><li><a href="#druid-setup">Druid Setup</a><ul class="toc-headings"><li><a href="#commonruntimeproperties">common.runtime.properties</a></li><li><a href="#hadoop-jars">Hadoop Jars</a></li><li><a href="#kerberos-setup">Kerberos setup</a></li><li><a href="#restart-druid-services">Restart Druid Services</a></li></ul></li></ul></nav></div><footer class="nav-footer druid-footer" id="footer"><div class="container"><div class="text-center"><p><a href="/technology">Technology</a> · <a href="/use-cases">Use Cases</a> · <a href="/druid-powered">Powered by Druid</a> · <a href="/docs/0.20.0/latest">Docs</a> · <a href="/community/">Community</a> · <a href="/downloads.html">Download</a> · <a href="/faq">FAQ</a></p></div><div class="text-center"><a title="Join the user group" href="https://groups.google.com/forum/#!forum/druid-user" target="_blank"><span class="fa fa-comments"></span></a> · <a title="Follow Druid" href="https://twitter.com/druidio" target="_blank"><span class="fab fa-twitter"></span></a> · <a title="Download via Apache" href="https://www.apache.org/dyn/closer.cgi?path=/incubator/druid/{{ site.druid_versions[0].versions[0].version }}/apache-druid-{{ site.druid_versions[0].versions[0].version }}-bin.tar.gz" target="_blank"><span class="fas fa-feather"></span></a> · <a title="GitHub" href="https://github.com/apache/druid" target="_blank"><span class="fab fa-github"></span></a></div><div class="text-center license">Copyright © 2019 <a href="https://www.apache.org/" target="_blank">Apache Software Foundation</a>.<br/>Except where otherwise noted, licensed under <a rel="license" href="http://creativecommons.org/licenses/by-sa/4.0/">CC BY-SA 4.0</a>.<br/>Apache Druid, Druid, and the Druid logo are either registered trademarks or trademarks of The Apache Software Foundation in the United States and other countries.</div></div></footer></div><script type="text/javascript" src="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.js"></script><script>
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+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
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+<p>This tutorial demonstrates how to query data in Apache Druid using SQL.</p>
+<p>It assumes that you've completed the <a href="/docs/0.20.0/tutorials/index.html">Quickstart</a>
+or one of the following tutorials, since we'll query datasources that you would have created
+by following one of them:</p>
+<ul>
+<li><a href="/docs/0.20.0/tutorials/tutorial-batch.html">Tutorial: Loading a file</a></li>
+<li><a href="/docs/0.20.0/tutorials/tutorial-kafka.html">Tutorial: Loading stream data from Kafka</a></li>
+<li><a href="/docs/0.20.0/tutorials/tutorial-batch-hadoop.html">Tutorial: Loading a file using Hadoop</a></li>
+</ul>
+<p>There are various ways to run Druid SQL queries: from the Druid console, using a command line utility
+and by posting the query by HTTP. We'll look at each of these.</p>
+<h2><a class="anchor" aria-hidden="true" id="query-sql-from-the-druid-console"></a><a href="#query-sql-from-the-druid-console" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Query SQL from the Druid console</h2>
+<p>The Druid console includes a view that makes it easier to build and test queries, and
+view their results.</p>
+<ol>
+<li><p>Start up the Druid cluster, if it's not already running, and open the Druid console in your web
+browser.</p></li>
+<li><p>Click <strong>Query</strong> from the header to open the Query view:</p>
+<p><img src="../assets/tutorial-query-01.png" alt="Query view" title="Query view"></p>
+<p>You can always write queries directly in the edit pane, but the Query view also provides
+facilities to help you construct SQL queries, which we will use to generate a starter query.</p></li>
+<li><p>Expand the wikipedia datasource tree in the left pane. We'll
+create a query for the page dimension.</p></li>
+<li><p>Click <code>page</code> and then <strong>Show:page</strong> from the menu:</p>
+<p><img src="../assets/tutorial-query-02.png" alt="Query select page" title="Query select page"></p>
+<p>A SELECT query appears in the query edit pane and immediately runs. However, in this case, the query
+returns no data, since by default the query filters for data from the last day, while our data is considerably
+older than that. Let's remove the filter.</p></li>
+<li><p>In the datasource tree, click <code>__time</code> and <strong>Remove Filter</strong>.</p>
+<p><img src="../assets/tutorial-query-03.png" alt="Clear WHERE filter" title="Clear WHERE filter"></p></li>
+<li><p>Click <strong>Run</strong> to run the query.</p>
+<p>You should now see two columns of data, a page name and the count:</p>
+<p><img src="../assets/tutorial-query-04.png" alt="Query results" title="Query results"></p>
+<p>Notice that the results are limited in the console to about a hundred, by default, due to the <strong>Smart query limit</strong>
+feature. This helps users avoid inadvertently running queries that return an excessive amount of data, possibly
+overwhelming their system.</p></li>
+<li><p>Let's edit the query directly and take a look at a few more query building features in the editor.
+Click in the query edit pane and make the following changes:</p>
+<ol>
+<li><p>Add a line after the first column, <code>&quot;page&quot;</code> and Start typing the name of a new column, <code>&quot;countryName&quot;</code>. Notice that the autocomplete menu suggests column names, functions, keywords, and more. Choose &quot;countryName&quot; and
+add the new column to the GROUP BY clause as well, either by name or by reference to its position, <code>2</code>.</p></li>
+<li><p>For readability, replace <code>Count</code> column name with <code>Edits</code>, since the <code>COUNT()</code> function actually
+returns the number of edits for the page. Make the same column name change in the ORDER BY clause as well.</p>
+<p>The <code>COUNT()</code> function is one of many functions available for use in Druid SQL queries. You can mouse over a function name
+in the autocomplete menu to see a brief description of a function. Also, you can find more information in the Druid
+documentation; for example, the <code>COUNT()</code> function is documented in
+<a href="/docs/0.20.0/querying/sql.html#aggregation-functions">Aggregation functions</a>.</p></li>
+</ol>
+<p>The query should now be:</p>
+<pre><code class="hljs css language-sql"><span class="hljs-keyword">SELECT</span>
+  <span class="hljs-string">"page"</span>,
+  <span class="hljs-string">"countryName"</span>,
+  <span class="hljs-keyword">COUNT</span>(*) <span class="hljs-keyword">AS</span> <span class="hljs-string">"Edits"</span>
+<span class="hljs-keyword">FROM</span> <span class="hljs-string">"wikipedia"</span>
+<span class="hljs-keyword">GROUP</span> <span class="hljs-keyword">BY</span> <span class="hljs-number">1</span>, <span class="hljs-number">2</span>
+<span class="hljs-keyword">ORDER</span> <span class="hljs-keyword">BY</span> <span class="hljs-string">"Edits"</span> <span class="hljs-keyword">DESC</span>
+</code></pre>
+<p>When you run the query again, notice that we're getting the new dimension,<code>countryName</code>, but for most of the rows, its value
+is null. Let's
+show only rows with a <code>countryName</code> value.</p></li>
+<li><p>Click the countryName dimension in the left pane and choose the first filtering option. It's not exactly what we want, but
+we'll edit it by hand. The new WHERE clause should appear in your query.</p></li>
+<li><p>Modify the WHERE clause to exclude results that do not have a value for countryName:</p>
+<pre><code class="hljs css language-sql">WHERE "countryName" IS NOT NULL
+</code></pre>
+<p>Run the query again. You should now see the top edits by country:</p>
+<p><img src="../assets/tutorial-query-035.png" alt="Finished query" title="Finished query"></p></li>
+<li><p>Under the covers, every Druid SQL query is translated into a query in the JSON-based <em>Druid native query</em> format before it runs
+on data nodes. You can view the native query for this query by clicking <code>...</code> and <strong>Explain SQL Query</strong>.</p>
+<p>While you can use Druid SQL for most purposes, familiarity with native query is useful for composing complex queries and for troubleshooting
+performance issues. For more information, see <a href="/docs/0.20.0/querying/querying.html">Native queries</a>.</p>
+<p><img src="../assets/tutorial-query-06.png" alt="Explain query" title="Explain query"></p>
+<blockquote>
+<p>Another way to view the explain plan is by adding EXPLAIN PLAN FOR to the front of your query, as follows:</p>
+<pre><code class="hljs css language-sql"><span class="hljs-keyword">EXPLAIN</span> PLAN <span class="hljs-keyword">FOR</span>
+<span class="hljs-keyword">SELECT</span>
+ <span class="hljs-string">"page"</span>,
+ <span class="hljs-string">"countryName"</span>,
+ <span class="hljs-keyword">COUNT</span>(*) <span class="hljs-keyword">AS</span> <span class="hljs-string">"Edits"</span>
+<span class="hljs-keyword">FROM</span> <span class="hljs-string">"wikipedia"</span>
+<span class="hljs-keyword">WHERE</span> <span class="hljs-string">"countryName"</span> <span class="hljs-keyword">IS</span> <span class="hljs-keyword">NOT</span> <span class="hljs-literal">NULL</span>
+<span class="hljs-keyword">GROUP</span> <span class="hljs-keyword">BY</span> <span class="hljs-number">1</span>, <span class="hljs-number">2</span>
+<span class="hljs-keyword">ORDER</span> <span class="hljs-keyword">BY</span> <span class="hljs-string">"Edits"</span> <span class="hljs-keyword">DESC</span>
+</code></pre>
+<p>This is particularly useful when running queries
+from the command line or over HTTP.</p>
+</blockquote></li>
+</ol>
+<ol start="9">
+<li>Finally, click  <code>...</code>  and <strong>Edit context</strong> to see how you can add additional parameters controlling the execution of the query execution. In the field, enter query context options as JSON key-value pairs, as described in <a href="/docs/0.20.0/querying/query-context.html">Context flags</a>.</li>
+</ol>
+<p>That's it! We've built a simple query using some of the query builder features built into the Druid Console. The following
+sections provide a few more example queries you can try. Also, see <a href="#other-ways-to-invoke-sql-queries">Other ways to invoke SQL queries</a> to learn how
+to run Druid SQL from the command line or over HTTP.</p>
+<h2><a class="anchor" aria-hidden="true" id="more-druid-sql-examples"></a><a href="#more-druid-sql-examples" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>More Druid SQL examples</h2>
+<p>Here is a collection of queries to try out:</p>
+<h3><a class="anchor" aria-hidden="true" id="query-over-time"></a><a href="#query-over-time" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Query over time</h3>
+<pre><code class="hljs css language-sql"><span class="hljs-keyword">SELECT</span> <span class="hljs-keyword">FLOOR</span>(__time <span class="hljs-keyword">to</span> <span class="hljs-keyword">HOUR</span>) <span class="hljs-keyword">AS</span> HourTime, <span class="hljs-keyword">SUM</span>(deleted) <span class="hljs-keyword">AS</span> LinesDeleted
+<span class="hljs-keyword">FROM</span> wikipedia <span class="hljs-keyword">WHERE</span> <span class="hljs-string">"__time"</span> <span class="hljs-keyword">BETWEEN</span> <span class="hljs-built_in">TIMESTAMP</span> <span class="hljs-string">'2015-09-12 00:00:00'</span> <span class="hljs-keyword">AND</span> <span class="hljs-built_in">TIMESTAMP</span> <span class="hljs-string">'2015-09-13 00:00:00'</span>
+<span class="hljs-keyword">GROUP</span> <span class="hljs-keyword">BY</span> <span class="hljs-number">1</span>
+</code></pre>
+<p><img src="../assets/tutorial-query-07.png" alt="Query example" title="Query example"></p>
+<h3><a class="anchor" aria-hidden="true" id="general-group-by"></a><a href="#general-group-by" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>General group by</h3>
+<pre><code class="hljs css language-sql"><span class="hljs-keyword">SELECT</span> channel, page, <span class="hljs-keyword">SUM</span>(added)
+<span class="hljs-keyword">FROM</span> wikipedia <span class="hljs-keyword">WHERE</span> <span class="hljs-string">"__time"</span> <span class="hljs-keyword">BETWEEN</span> <span class="hljs-built_in">TIMESTAMP</span> <span class="hljs-string">'2015-09-12 00:00:00'</span> <span class="hljs-keyword">AND</span> <span class="hljs-built_in">TIMESTAMP</span> <span class="hljs-string">'2015-09-13 00:00:00'</span>
+<span class="hljs-keyword">GROUP</span> <span class="hljs-keyword">BY</span> channel, page
+<span class="hljs-keyword">ORDER</span> <span class="hljs-keyword">BY</span> <span class="hljs-keyword">SUM</span>(added) <span class="hljs-keyword">DESC</span>
+</code></pre>
+<p><img src="../assets/tutorial-query-08.png" alt="Query example" title="Query example"></p>
+<h2><a class="anchor" aria-hidden="true" id="other-ways-to-invoke-sql-queries"></a><a href="#other-ways-to-invoke-sql-queries" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Other ways to invoke SQL queries</h2>
+<h3><a class="anchor" aria-hidden="true" id="query-sql-via-dsql"></a><a href="#query-sql-via-dsql" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Query SQL via dsql</h3>
+<p>For convenience, the Druid package includes a SQL command-line client, located at <code>bin/dsql</code> in the Druid package root.</p>
+<p>Let's now run <code>bin/dsql</code>; you should see the following prompt:</p>
+<pre><code class="hljs css language-bash">Welcome to dsql, the <span class="hljs-built_in">command</span>-line client <span class="hljs-keyword">for</span> Druid SQL.
+Type <span class="hljs-string">"\h"</span> <span class="hljs-keyword">for</span> <span class="hljs-built_in">help</span>.
+dsql&gt;
+</code></pre>
+<p>To submit the query, paste it to the <code>dsql</code> prompt and press enter:</p>
+<pre><code class="hljs css language-bash">dsql&gt; SELECT page, COUNT(*) AS Edits FROM wikipedia WHERE <span class="hljs-string">"__time"</span> BETWEEN TIMESTAMP <span class="hljs-string">'2015-09-12 00:00:00'</span> AND TIMESTAMP <span class="hljs-string">'2015-09-13 00:00:00'</span> GROUP BY page ORDER BY Edits DESC LIMIT 10;
+┌──────────────────────────────────────────────────────────┬───────┐
+│ page                                                     │ Edits │
+├──────────────────────────────────────────────────────────┼───────┤
+│ Wikipedia:Vandalismusmeldung                             │    33 │
+│ User:Cyde/List of candidates <span class="hljs-keyword">for</span> speedy deletion/Subpage │    28 │
+│ Jeremy Corbyn                                            │    27 │
+│ Wikipedia:Administrators<span class="hljs-string">' noticeboard/Incidents          │    21 │
+│ Flavia Pennetta                                          │    20 │
+│ Total Drama Presents: The Ridonculous Race               │    18 │
+│ User talk:Dudeperson176123                               │    18 │
+│ Wikipédia:Le Bistro/12 septembre 2015                    │    18 │
+│ Wikipedia:In the news/Candidates                         │    17 │
+│ Wikipedia:Requests for page protection                   │    17 │
+└──────────────────────────────────────────────────────────┴───────┘
+Retrieved 10 rows in 0.06s.
+</span></code></pre>
+<h3><a class="anchor" aria-hidden="true" id="query-sql-over-http"></a><a href="#query-sql-over-http" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Query SQL over HTTP</h3>
+<p>You can submit queries directly to the Druid Broker over HTTP.</p>
+<p>The tutorial package includes an example file that contains the SQL query shown above at <code>quickstart/tutorial/wikipedia-top-pages-sql.json</code>. Let's submit that query to the Druid Broker:</p>
+<pre><code class="hljs css language-bash">curl -X <span class="hljs-string">'POST'</span> -H <span class="hljs-string">'Content-Type:application/json'</span> -d @quickstart/tutorial/wikipedia-top-pages-sql.json http://localhost:8888/druid/v2/sql
+</code></pre>
+<p>The following results should be returned:</p>
+<pre><code class="hljs css language-json">[
+  {
+    <span class="hljs-attr">"page"</span>: <span class="hljs-string">"Wikipedia:Vandalismusmeldung"</span>,
+    <span class="hljs-attr">"Edits"</span>: <span class="hljs-number">33</span>
+  },
+  {
+    <span class="hljs-attr">"page"</span>: <span class="hljs-string">"User:Cyde/List of candidates for speedy deletion/Subpage"</span>,
+    <span class="hljs-attr">"Edits"</span>: <span class="hljs-number">28</span>
+  },
+  {
+    <span class="hljs-attr">"page"</span>: <span class="hljs-string">"Jeremy Corbyn"</span>,
+    <span class="hljs-attr">"Edits"</span>: <span class="hljs-number">27</span>
+  },
+  {
+    <span class="hljs-attr">"page"</span>: <span class="hljs-string">"Wikipedia:Administrators' noticeboard/Incidents"</span>,
+    <span class="hljs-attr">"Edits"</span>: <span class="hljs-number">21</span>
+  },
+  {
+    <span class="hljs-attr">"page"</span>: <span class="hljs-string">"Flavia Pennetta"</span>,
+    <span class="hljs-attr">"Edits"</span>: <span class="hljs-number">20</span>
+  },
+  {
+    <span class="hljs-attr">"page"</span>: <span class="hljs-string">"Total Drama Presents: The Ridonculous Race"</span>,
+    <span class="hljs-attr">"Edits"</span>: <span class="hljs-number">18</span>
+  },
+  {
+    <span class="hljs-attr">"page"</span>: <span class="hljs-string">"User talk:Dudeperson176123"</span>,
+    <span class="hljs-attr">"Edits"</span>: <span class="hljs-number">18</span>
+  },
+  {
+    <span class="hljs-attr">"page"</span>: <span class="hljs-string">"Wikipédia:Le Bistro/12 septembre 2015"</span>,
+    <span class="hljs-attr">"Edits"</span>: <span class="hljs-number">18</span>
+  },
+  {
+    <span class="hljs-attr">"page"</span>: <span class="hljs-string">"Wikipedia:In the news/Candidates"</span>,
+    <span class="hljs-attr">"Edits"</span>: <span class="hljs-number">17</span>
+  },
+  {
+    <span class="hljs-attr">"page"</span>: <span class="hljs-string">"Wikipedia:Requests for page protection"</span>,
+    <span class="hljs-attr">"Edits"</span>: <span class="hljs-number">17</span>
+  }
+]
+</code></pre>
+<h2><a class="anchor" aria-hidden="true" id="further-reading"></a><a href="#further-reading" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Further reading</h2>
+<p>See the <a href="/docs/0.20.0/querying/sql.html">Druid SQL documentation</a> for more information on using Druid SQL queries.</p>
+<p>See the <a href="/docs/0.20.0/querying/querying.html">Queries documentation</a> for more information on Druid native queries.</p>
+</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/0.20.0/tutorials/tutorial-batch-hadoop.html"><span class="arrow-prev">← </span><span>Load from Apache Hadoop</span></a><a class="docs-next button" href="/docs/0.20.0/tutorials/tutorial-rollup.html"><span>Roll-up</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#query-sql-from-the-druid-console">Query SQL from the Druid console</a></li><li><a href="#more-druid-sql-examples">More Druid SQL examples</a><ul class="toc-headings"><li><a href="#query-over-time">Query over time</a></li><li><a href="#general-group-by">General group by</a></li></ul></li><li><a href="#other-ways-to-invoke-sql-queries">Other ways to invoke SQL queries</a><ul class="toc-headings"><li><a href="#query-sql-via-dsql">Query SQL via dsql</a></li><li><a href="#query-sql-over-http">Query SQL over HTTP</a></li></ul></li><li><a href="#further-reading">Further reading</a></li></ul></nav></div><footer class="nav-footer druid-footer" id="footer"><div class="container"><div class="text-center"><p><a href="/technology">Technology</a> · <a href="/use-cases">Use Cases</a> · <a href="/druid-powered">Powered by Druid</a> · <a href="/docs/0.20.0/latest">Docs</a> · <a href="/community/">Community</a> · <a href="/downloads.html">Download</a> · <a href="/faq">FAQ</a></p></div><div class="text-center"><a title="Join the user group" href="https://groups.google.com/forum/#!forum/druid-user" target="_blank"><span class="fa fa-comments"></span></a> · <a title="Follow Druid" href="https://twitter.com/druidio" target="_blank"><span class="fab fa-twitter"></span></a> · <a title="Download via Apache" href="https://www.apache.org/dyn/closer.cgi?path=/incubator/druid/{{ site.druid_versions[0].versions[0].version }}/apache-druid-{{ site.druid_versions[0].versions[0].version }}-bin.tar.gz" target="_blank"><span class="fas fa-feather"></span></a> · <a title="GitHub" href="https://github.com/apache/druid" target="_blank"><span class="fab fa-github"></span></a></div><div class="text-center license">Copyright © 2019 <a href="https://www.apache.org/" target="_blank">Apache Software Foundation</a>.<br/>Except where otherwise noted, licensed under <a rel="license" href="http://creativecommons.org/licenses/by-sa/4.0/">CC BY-SA 4.0</a>.<br/>Apache Druid, Druid, and the Druid logo are either registered trademarks or trademarks of The Apache Software Foundation in the United States and other countries.</div></div></footer></div><script type="text/javascript" src="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.js"></script><script>
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+<p>This tutorial demonstrates how to configure retention rules on a datasource to set the time intervals of data that will be retained or dropped.</p>
+<p>For this tutorial, we'll assume you've already downloaded Apache Druid as described in
+the <a href="index.html">single-machine quickstart</a> and have it running on your local machine.</p>
+<p>It will also be helpful to have finished <a href="/docs/0.20.0/tutorials/tutorial-batch.html">Tutorial: Loading a file</a> and <a href="/docs/0.20.0/tutorials/tutorial-query.html">Tutorial: Querying data</a>.</p>
+<h2><a class="anchor" aria-hidden="true" id="load-the-example-data"></a><a href="#load-the-example-data" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Load the example data</h2>
+<p>For this tutorial, we'll be using the Wikipedia edits sample data, with an ingestion task spec that will create a separate segment for each hour in the input data.</p>
+<p>The ingestion spec can be found at <code>quickstart/tutorial/retention-index.json</code>. Let's submit that spec, which will create a datasource called <code>retention-tutorial</code>:</p>
+<pre><code class="hljs css language-bash">bin/post-index-task --file quickstart/tutorial/retention-index.json --url http://localhost:8081
+</code></pre>
+<p>After the ingestion completes, go to <a href="http://localhost:8888/unified-console.html#datasources">http://localhost:8888/unified-console.html#datasources</a> in a browser to access the Druid Console's datasource view.</p>
+<p>This view shows the available datasources and a summary of the retention rules for each datasource:</p>
+<p><img src="../assets/tutorial-retention-01.png" alt="Summary" title="Summary"></p>
+<p>Currently there are no rules set for the <code>retention-tutorial</code> datasource. Note that there are default rules for the cluster: load forever with 2 replicas in <code>_default_tier</code>.</p>
+<p>This means that all data will be loaded regardless of timestamp, and each segment will be replicated to two Historical processes in the default tier.</p>
+<p>In this tutorial, we will ignore the tiering and redundancy concepts for now.</p>
+<p>Let's view the segments for the <code>retention-tutorial</code> datasource by clicking the &quot;24 Segments&quot; link next to &quot;Fully Available&quot;.</p>
+<p>The segments view (<a href="http://localhost:8888/unified-console.html#segments">http://localhost:8888/unified-console.html#segments</a>) provides information about what segments a datasource contains. The page shows that there are 24 segments, each one containing data for a specific hour of 2015-09-12:</p>
+<p><img src="../assets/tutorial-retention-02.png" alt="Original segments" title="Original segments"></p>
+<h2><a class="anchor" aria-hidden="true" id="set-retention-rules"></a><a href="#set-retention-rules" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Set retention rules</h2>
+<p>Suppose we want to drop data for the first 12 hours of 2015-09-12 and keep data for the later 12 hours of 2015-09-12.</p>
+<p>Go to the <a href="http://localhost:8888/unified-console.html#datasources">datasources view</a> and click the blue pencil icon next to <code>Cluster default: loadForever</code> for the <code>retention-tutorial</code> datasource.</p>
+<p>A rule configuration window will appear:</p>
+<p><img src="../assets/tutorial-retention-03.png" alt="Rule configuration" title="Rule configuration"></p>
+<p>Now click the <code>+ New rule</code> button twice.</p>
+<p>In the upper rule box, select <code>Load</code> and <code>by interval</code>, and then enter <code>2015-09-12T12:00:00.000Z/2015-09-13T00:00:00.000Z</code> in field next to <code>by interval</code>. Replicas can remain at 2 in the <code>_default_tier</code>.</p>
+<p>In the lower rule box, select <code>Drop</code> and <code>forever</code>.</p>
+<p>The rules should look like this:</p>
+<p><img src="../assets/tutorial-retention-04.png" alt="Set rules" title="Set rules"></p>
+<p>Now click <code>Next</code>. The rule configuration process will ask for a user name and comment, for change logging purposes. You can enter <code>tutorial</code> for both.</p>
+<p>Now click <code>Save</code>. You can see the new rules in the datasources view:</p>
+<p><img src="../assets/tutorial-retention-05.png" alt="New rules" title="New rules"></p>
+<p>Give the cluster a few minutes to apply the rule change, and go to the <a href="http://localhost:8888/unified-console.html#segments">segments view</a> in the Druid Console.
+The segments for the first 12 hours of 2015-09-12 are now gone:</p>
+<p><img src="../assets/tutorial-retention-06.png" alt="New segments" title="New segments"></p>
+<p>The resulting retention rule chain is the following:</p>
+<ol>
+<li><p>loadByInterval 2015-09-12T12/2015-09-13 (12 hours)</p></li>
+<li><p>dropForever</p></li>
+<li><p>loadForever (default rule)</p></li>
+</ol>
+<p>The rule chain is evaluated from top to bottom, with the default rule chain always added at the bottom.</p>
+<p>The tutorial rule chain we just created loads data if it is within the specified 12 hour interval.</p>
+<p>If data is not within the 12 hour interval, the rule chain evaluates <code>dropForever</code> next, which will drop any data.</p>
+<p>The <code>dropForever</code> terminates the rule chain, effectively overriding the default <code>loadForever</code> rule, which will never be reached in this rule chain.</p>
+<p>Note that in this tutorial we defined a load rule on a specific interval.</p>
+<p>If instead you want to retain data based on how old it is (e.g., retain data that ranges from 3 months in the past to the present time), you would define a Period load rule instead.</p>
+<h2><a class="anchor" aria-hidden="true" id="further-reading"></a><a href="#further-reading" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Further reading</h2>
+<ul>
+<li><a href="/docs/0.20.0/operations/rule-configuration.html">Load rules</a></li>
+</ul>
+</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/0.20.0/tutorials/tutorial-rollup.html"><span class="arrow-prev">← </span><span>Roll-up</span></a><a class="docs-next button" href="/docs/0.20.0/tutorials/tutorial-update-data.html"><span>Updating existing data</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#load-the-example-data">Load the example data</a></li><li><a href="#set-retention-rules">Set retention rules</a></li><li><a href="#further-reading">Further reading</a></li></ul></nav></div><footer class="nav-footer druid-footer" id="footer"><div class="container"><div class="text-center"><p><a href="/technology">Technology</a> · <a href="/use-cases">Use Cases</a> · <a href="/druid-powered">Powered by Druid</a> · <a href="/docs/0.20.0/latest">Docs</a> · <a href="/community/">Community</a> · <a href="/downloads.html">Download</a> · <a href="/faq">FAQ</a></p></div><div class="text-center"><a title="Join the user group" href="https://groups.google.com/forum/#!forum/druid-user" target="_blank"><span class="fa fa-comments"></span></a> · <a title="Follow Druid" href="https://twitter.com/druidio" target="_blank"><span class="fab fa-twitter"></span></a> · <a title="Download via Apache" href="https://www.apache.org/dyn/closer.cgi?path=/incubator/druid/{{ site.druid_versions[0].versions[0].version }}/apache-druid-{{ site.druid_versions[0].versions[0].version }}-bin.tar.gz" target="_blank"><span class="fas fa-feather"></span></a> · <a title="GitHub" href="https://github.com/apache/druid" target="_blank"><span class="fab fa-github"></span></a></div><div class="text-center license">Copyright © 2019 <a href="https://www.apache.org/" target="_blank">Apache Software Foundation</a>.<br/>Except where otherwise noted, licensed under <a rel="license" href="http://creativecommons.org/licenses/by-sa/4.0/">CC BY-SA 4.0</a>.<br/>Apache Druid, Druid, and the Druid logo are either registered trademarks or trademarks of The Apache Software Foundation in the United States and other countries.</div></div></footer></div><script type="text/javascript" src="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.js"></script><script>
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+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Tutorial: Roll-up · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/0.20.0/tutorials/tutorial-rollup.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.20.0" /><meta property="og:title" content="Tutorial: Roll-up · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
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+  ~ Licensed to the Apache Software Foundation (ASF) under one
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+<p>Apache Druid can summarize raw data at ingestion time using a process we refer to as &quot;roll-up&quot;. Roll-up is a first-level aggregation operation over a selected set of columns that reduces the size of stored data.</p>
+<p>This tutorial will demonstrate the effects of roll-up on an example dataset.</p>
+<p>For this tutorial, we'll assume you've already downloaded Druid as described in
+the <a href="index.html">single-machine quickstart</a> and have it running on your local machine.</p>
+<p>It will also be helpful to have finished <a href="/docs/0.20.0/tutorials/tutorial-batch.html">Tutorial: Loading a file</a> and <a href="/docs/0.20.0/tutorials/tutorial-query.html">Tutorial: Querying data</a>.</p>
+<h2><a class="anchor" aria-hidden="true" id="example-data"></a><a href="#example-data" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Example data</h2>
+<p>For this tutorial, we'll use a small sample of network flow event data, representing packet and byte counts for traffic from a source to a destination IP address that occurred within a particular second.</p>
+<pre><code class="hljs css language-json">{<span class="hljs-attr">"timestamp"</span>:<span class="hljs-string">"2018-01-01T01:01:35Z"</span>,<span class="hljs-attr">"srcIP"</span>:<span class="hljs-string">"1.1.1.1"</span>, <span class="hljs-attr">"dstIP"</span>:<span class="hljs-string">"2.2.2.2"</span>,<span class="hljs-attr">"packets"</span>:<span class="hljs-number">20</span>,<span class="hljs-attr">"bytes"</span>:<span class="hljs-number">9024</span>}
+{<span class="hljs-attr">"timestamp"</span>:<span class="hljs-string">"2018-01-01T01:01:51Z"</span>,<span class="hljs-attr">"srcIP"</span>:<span class="hljs-string">"1.1.1.1"</span>, <span class="hljs-attr">"dstIP"</span>:<span class="hljs-string">"2.2.2.2"</span>,<span class="hljs-attr">"packets"</span>:<span class="hljs-number">255</span>,<span class="hljs-attr">"bytes"</span>:<span class="hljs-number">21133</span>}
+{<span class="hljs-attr">"timestamp"</span>:<span class="hljs-string">"2018-01-01T01:01:59Z"</span>,<span class="hljs-attr">"srcIP"</span>:<span class="hljs-string">"1.1.1.1"</span>, <span class="hljs-attr">"dstIP"</span>:<span class="hljs-string">"2.2.2.2"</span>,<span class="hljs-attr">"packets"</span>:<span class="hljs-number">11</span>,<span class="hljs-attr">"bytes"</span>:<span class="hljs-number">5780</span>}
+{<span class="hljs-attr">"timestamp"</span>:<span class="hljs-string">"2018-01-01T01:02:14Z"</span>,<span class="hljs-attr">"srcIP"</span>:<span class="hljs-string">"1.1.1.1"</span>, <span class="hljs-attr">"dstIP"</span>:<span class="hljs-string">"2.2.2.2"</span>,<span class="hljs-attr">"packets"</span>:<span class="hljs-number">38</span>,<span class="hljs-attr">"bytes"</span>:<span class="hljs-number">6289</span>}
+{<span class="hljs-attr">"timestamp"</span>:<span class="hljs-string">"2018-01-01T01:02:29Z"</span>,<span class="hljs-attr">"srcIP"</span>:<span class="hljs-string">"1.1.1.1"</span>, <span class="hljs-attr">"dstIP"</span>:<span class="hljs-string">"2.2.2.2"</span>,<span class="hljs-attr">"packets"</span>:<span class="hljs-number">377</span>,<span class="hljs-attr">"bytes"</span>:<span class="hljs-number">359971</span>}
+{<span class="hljs-attr">"timestamp"</span>:<span class="hljs-string">"2018-01-01T01:03:29Z"</span>,<span class="hljs-attr">"srcIP"</span>:<span class="hljs-string">"1.1.1.1"</span>, <span class="hljs-attr">"dstIP"</span>:<span class="hljs-string">"2.2.2.2"</span>,<span class="hljs-attr">"packets"</span>:<span class="hljs-number">49</span>,<span class="hljs-attr">"bytes"</span>:<span class="hljs-number">10204</span>}
+{<span class="hljs-attr">"timestamp"</span>:<span class="hljs-string">"2018-01-02T21:33:14Z"</span>,<span class="hljs-attr">"srcIP"</span>:<span class="hljs-string">"7.7.7.7"</span>, <span class="hljs-attr">"dstIP"</span>:<span class="hljs-string">"8.8.8.8"</span>,<span class="hljs-attr">"packets"</span>:<span class="hljs-number">38</span>,<span class="hljs-attr">"bytes"</span>:<span class="hljs-number">6289</span>}
+{<span class="hljs-attr">"timestamp"</span>:<span class="hljs-string">"2018-01-02T21:33:45Z"</span>,<span class="hljs-attr">"srcIP"</span>:<span class="hljs-string">"7.7.7.7"</span>, <span class="hljs-attr">"dstIP"</span>:<span class="hljs-string">"8.8.8.8"</span>,<span class="hljs-attr">"packets"</span>:<span class="hljs-number">123</span>,<span class="hljs-attr">"bytes"</span>:<span class="hljs-number">93999</span>}
+{<span class="hljs-attr">"timestamp"</span>:<span class="hljs-string">"2018-01-02T21:35:45Z"</span>,<span class="hljs-attr">"srcIP"</span>:<span class="hljs-string">"7.7.7.7"</span>, <span class="hljs-attr">"dstIP"</span>:<span class="hljs-string">"8.8.8.8"</span>,<span class="hljs-attr">"packets"</span>:<span class="hljs-number">12</span>,<span class="hljs-attr">"bytes"</span>:<span class="hljs-number">2818</span>}
+</code></pre>
+<p>A file containing this sample input data is located at <code>quickstart/tutorial/rollup-data.json</code>.</p>
+<p>We'll ingest this data using the following ingestion task spec, located at <code>quickstart/tutorial/rollup-index.json</code>.</p>
+<pre><code class="hljs css language-json">{
+  <span class="hljs-attr">"type"</span> : <span class="hljs-string">"index_parallel"</span>,
+  <span class="hljs-attr">"spec"</span> : {
+    <span class="hljs-attr">"dataSchema"</span> : {
+      <span class="hljs-attr">"dataSource"</span> : <span class="hljs-string">"rollup-tutorial"</span>,
+      <span class="hljs-attr">"dimensionsSpec"</span> : {
+        <span class="hljs-attr">"dimensions"</span> : [
+          <span class="hljs-string">"srcIP"</span>,
+          <span class="hljs-string">"dstIP"</span>
+        ]
+      },
+      <span class="hljs-attr">"timestampSpec"</span>: {
+        <span class="hljs-attr">"column"</span>: <span class="hljs-string">"timestamp"</span>,
+        <span class="hljs-attr">"format"</span>: <span class="hljs-string">"iso"</span>
+      },
+      <span class="hljs-attr">"metricsSpec"</span> : [
+        { <span class="hljs-attr">"type"</span> : <span class="hljs-string">"count"</span>, <span class="hljs-attr">"name"</span> : <span class="hljs-string">"count"</span> },
+        { <span class="hljs-attr">"type"</span> : <span class="hljs-string">"longSum"</span>, <span class="hljs-attr">"name"</span> : <span class="hljs-string">"packets"</span>, <span class="hljs-attr">"fieldName"</span> : <span class="hljs-string">"packets"</span> },
+        { <span class="hljs-attr">"type"</span> : <span class="hljs-string">"longSum"</span>, <span class="hljs-attr">"name"</span> : <span class="hljs-string">"bytes"</span>, <span class="hljs-attr">"fieldName"</span> : <span class="hljs-string">"bytes"</span> }
+      ],
+      <span class="hljs-attr">"granularitySpec"</span> : {
+        <span class="hljs-attr">"type"</span> : <span class="hljs-string">"uniform"</span>,
+        <span class="hljs-attr">"segmentGranularity"</span> : <span class="hljs-string">"week"</span>,
+        <span class="hljs-attr">"queryGranularity"</span> : <span class="hljs-string">"minute"</span>,
+        <span class="hljs-attr">"intervals"</span> : [<span class="hljs-string">"2018-01-01/2018-01-03"</span>],
+        <span class="hljs-attr">"rollup"</span> : <span class="hljs-literal">true</span>
+      }
+    },
+    <span class="hljs-attr">"ioConfig"</span> : {
+      <span class="hljs-attr">"type"</span> : <span class="hljs-string">"index_parallel"</span>,
+      <span class="hljs-attr">"inputSource"</span> : {
+        <span class="hljs-attr">"type"</span> : <span class="hljs-string">"local"</span>,
+        <span class="hljs-attr">"baseDir"</span> : <span class="hljs-string">"quickstart/tutorial"</span>,
+        <span class="hljs-attr">"filter"</span> : <span class="hljs-string">"rollup-data.json"</span>
+      },
+      <span class="hljs-attr">"inputFormat"</span> : {
+        <span class="hljs-attr">"type"</span> : <span class="hljs-string">"json"</span>
+      },
+      <span class="hljs-attr">"appendToExisting"</span> : <span class="hljs-literal">false</span>
+    },
+    <span class="hljs-attr">"tuningConfig"</span> : {
+      <span class="hljs-attr">"type"</span> : <span class="hljs-string">"index_parallel"</span>,
+      <span class="hljs-attr">"maxRowsPerSegment"</span> : <span class="hljs-number">5000000</span>,
+      <span class="hljs-attr">"maxRowsInMemory"</span> : <span class="hljs-number">25000</span>
+    }
+  }
+}
+</code></pre>
+<p>Roll-up has been enabled by setting <code>&quot;rollup&quot; : true</code> in the <code>granularitySpec</code>.</p>
+<p>Note that we have <code>srcIP</code> and <code>dstIP</code> defined as dimensions, a longSum metric is defined for the <code>packets</code> and <code>bytes</code> columns, and the <code>queryGranularity</code> has been defined as <code>minute</code>.</p>
+<p>We will see how these definitions are used after we load this data.</p>
+<h2><a class="anchor" aria-hidden="true" id="load-the-example-data"></a><a href="#load-the-example-data" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Load the example data</h2>
+<p>From the apache-druid-0.20.0 package root, run the following command:</p>
+<pre><code class="hljs css language-bash">bin/post-index-task --file quickstart/tutorial/rollup-index.json --url http://localhost:8081
+</code></pre>
+<p>After the script completes, we will query the data.</p>
+<h2><a class="anchor" aria-hidden="true" id="query-the-example-data"></a><a href="#query-the-example-data" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Query the example data</h2>
+<p>Let's run <code>bin/dsql</code> and issue a <code>select * from &quot;rollup-tutorial&quot;;</code> query to see what data was ingested.</p>
+<pre><code class="hljs css language-bash">$ bin/dsql
+Welcome to dsql, the <span class="hljs-built_in">command</span>-line client <span class="hljs-keyword">for</span> Druid SQL.
+Type <span class="hljs-string">"\h"</span> <span class="hljs-keyword">for</span> <span class="hljs-built_in">help</span>.
+dsql&gt; select * from <span class="hljs-string">"rollup-tutorial"</span>;
+┌──────────────────────────┬────────┬───────┬─────────┬─────────┬─────────┐
+│ __time                   │ bytes  │ count │ dstIP   │ packets │ srcIP   │
+├──────────────────────────┼────────┼───────┼─────────┼─────────┼─────────┤
+│ 2018-01-01T01:01:00.000Z │  35937 │     3 │ 2.2.2.2 │     286 │ 1.1.1.1 │
+│ 2018-01-01T01:02:00.000Z │ 366260 │     2 │ 2.2.2.2 │     415 │ 1.1.1.1 │
+│ 2018-01-01T01:03:00.000Z │  10204 │     1 │ 2.2.2.2 │      49 │ 1.1.1.1 │
+│ 2018-01-02T21:33:00.000Z │ 100288 │     2 │ 8.8.8.8 │     161 │ 7.7.7.7 │
+│ 2018-01-02T21:35:00.000Z │   2818 │     1 │ 8.8.8.8 │      12 │ 7.7.7.7 │
+└──────────────────────────┴────────┴───────┴─────────┴─────────┴─────────┘
+Retrieved 5 rows <span class="hljs-keyword">in</span> 1.18s.
+
+dsql&gt;
+</code></pre>
+<p>Let's look at the three events in the original input data that occurred during <code>2018-01-01T01:01</code>:</p>
+<pre><code class="hljs css language-json">{<span class="hljs-attr">"timestamp"</span>:<span class="hljs-string">"2018-01-01T01:01:35Z"</span>,<span class="hljs-attr">"srcIP"</span>:<span class="hljs-string">"1.1.1.1"</span>, <span class="hljs-attr">"dstIP"</span>:<span class="hljs-string">"2.2.2.2"</span>,<span class="hljs-attr">"packets"</span>:<span class="hljs-number">20</span>,<span class="hljs-attr">"bytes"</span>:<span class="hljs-number">9024</span>}
+{<span class="hljs-attr">"timestamp"</span>:<span class="hljs-string">"2018-01-01T01:01:51Z"</span>,<span class="hljs-attr">"srcIP"</span>:<span class="hljs-string">"1.1.1.1"</span>, <span class="hljs-attr">"dstIP"</span>:<span class="hljs-string">"2.2.2.2"</span>,<span class="hljs-attr">"packets"</span>:<span class="hljs-number">255</span>,<span class="hljs-attr">"bytes"</span>:<span class="hljs-number">21133</span>}
+{<span class="hljs-attr">"timestamp"</span>:<span class="hljs-string">"2018-01-01T01:01:59Z"</span>,<span class="hljs-attr">"srcIP"</span>:<span class="hljs-string">"1.1.1.1"</span>, <span class="hljs-attr">"dstIP"</span>:<span class="hljs-string">"2.2.2.2"</span>,<span class="hljs-attr">"packets"</span>:<span class="hljs-number">11</span>,<span class="hljs-attr">"bytes"</span>:<span class="hljs-number">5780</span>}
+</code></pre>
+<p>These three rows have been &quot;rolled up&quot; into the following row:</p>
+<pre><code class="hljs css language-bash">┌──────────────────────────┬────────┬───────┬─────────┬─────────┬─────────┐
+│ __time                   │ bytes  │ count │ dstIP   │ packets │ srcIP   │
+├──────────────────────────┼────────┼───────┼─────────┼─────────┼─────────┤
+│ 2018-01-01T01:01:00.000Z │  35937 │     3 │ 2.2.2.2 │     286 │ 1.1.1.1 │
+└──────────────────────────┴────────┴───────┴─────────┴─────────┴─────────┘
+</code></pre>
+<p>The input rows have been grouped by the timestamp and dimension columns <code>{timestamp, srcIP, dstIP}</code> with sum aggregations on the metric columns <code>packets</code> and <code>bytes</code>.</p>
+<p>Before the grouping occurs, the timestamps of the original input data are bucketed/floored by minute, due to the <code>&quot;queryGranularity&quot;:&quot;minute&quot;</code> setting in the ingestion spec.</p>
+<p>Likewise, these two events that occurred during <code>2018-01-01T01:02</code> have been rolled up:</p>
+<pre><code class="hljs css language-json">{<span class="hljs-attr">"timestamp"</span>:<span class="hljs-string">"2018-01-01T01:02:14Z"</span>,<span class="hljs-attr">"srcIP"</span>:<span class="hljs-string">"1.1.1.1"</span>, <span class="hljs-attr">"dstIP"</span>:<span class="hljs-string">"2.2.2.2"</span>,<span class="hljs-attr">"packets"</span>:<span class="hljs-number">38</span>,<span class="hljs-attr">"bytes"</span>:<span class="hljs-number">6289</span>}
+{<span class="hljs-attr">"timestamp"</span>:<span class="hljs-string">"2018-01-01T01:02:29Z"</span>,<span class="hljs-attr">"srcIP"</span>:<span class="hljs-string">"1.1.1.1"</span>, <span class="hljs-attr">"dstIP"</span>:<span class="hljs-string">"2.2.2.2"</span>,<span class="hljs-attr">"packets"</span>:<span class="hljs-number">377</span>,<span class="hljs-attr">"bytes"</span>:<span class="hljs-number">359971</span>}
+</code></pre>
+<pre><code class="hljs css language-bash">┌──────────────────────────┬────────┬───────┬─────────┬─────────┬─────────┐
+│ __time                   │ bytes  │ count │ dstIP   │ packets │ srcIP   │
+├──────────────────────────┼────────┼───────┼─────────┼─────────┼─────────┤
+│ 2018-01-01T01:02:00.000Z │ 366260 │     2 │ 2.2.2.2 │     415 │ 1.1.1.1 │
+└──────────────────────────┴────────┴───────┴─────────┴─────────┴─────────┘
+</code></pre>
+<p>For the last event recording traffic between 1.1.1.1 and 2.2.2.2, no roll-up took place, because this was the only event that occurred during <code>2018-01-01T01:03</code>:</p>
+<pre><code class="hljs css language-json">{<span class="hljs-attr">"timestamp"</span>:<span class="hljs-string">"2018-01-01T01:03:29Z"</span>,<span class="hljs-attr">"srcIP"</span>:<span class="hljs-string">"1.1.1.1"</span>, <span class="hljs-attr">"dstIP"</span>:<span class="hljs-string">"2.2.2.2"</span>,<span class="hljs-attr">"packets"</span>:<span class="hljs-number">49</span>,<span class="hljs-attr">"bytes"</span>:<span class="hljs-number">10204</span>}
+</code></pre>
+<pre><code class="hljs css language-bash">┌──────────────────────────┬────────┬───────┬─────────┬─────────┬─────────┐
+│ __time                   │ bytes  │ count │ dstIP   │ packets │ srcIP   │
+├──────────────────────────┼────────┼───────┼─────────┼─────────┼─────────┤
+│ 2018-01-01T01:03:00.000Z │  10204 │     1 │ 2.2.2.2 │      49 │ 1.1.1.1 │
+└──────────────────────────┴────────┴───────┴─────────┴─────────┴─────────┘
+</code></pre>
+<p>Note that the <code>count</code> metric shows how many rows in the original input data contributed to the final &quot;rolled up&quot; row.</p>
+</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/0.20.0/tutorials/tutorial-query.html"><span class="arrow-prev">← </span><span>Querying data</span></a><a class="docs-next button" href="/docs/0.20.0/tutorials/tutorial-retention.html"><span>Configuring data retention</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#example-data">Example data</a></li><li><a href="#load-the-example-data">Load the example data</a></li><li><a href="#query-the-example-data">Query the example data</a></li></ul></nav></div><footer class="nav-footer druid-footer" id="footer"><div class="container"><div class="text-center"><p><a href="/technology">Technology</a> · <a href="/use-cases">Use Cases</a> · <a href="/druid-powered">Powered by Druid</a> · <a href="/docs/0.20.0/latest">Docs</a> · <a href="/community/">Community</a> · <a href="/downloads.html">Download</a> · <a href="/faq">FAQ</a></p></div><div class="text-center"><a title="Join the user group" href="https://groups.google.com/forum/#!forum/druid-user" target="_blank"><span class="fa fa-comments"></span></a> · <a title="Follow Druid" href="https://twitter.com/druidio" target="_blank"><span class="fab fa-twitter"></span></a> · <a title="Download via Apache" href="https://www.apache.org/dyn/closer.cgi?path=/incubator/druid/{{ site.druid_versions[0].versions[0].version }}/apache-druid-{{ site.druid_versions[0].versions[0].version }}-bin.tar.gz" target="_blank"><span class="fas fa-feather"></span></a> · <a title="GitHub" href="https://github.com/apache/druid" target="_blank"><span class="fab fa-github"></span></a></div><div class="text-center license">Copyright © 2019 <a href="https://www.apache.org/" target="_blank">Apache Software Foundation</a>.<br/>Except where otherwise noted, licensed under <a rel="license" href="http://creativecommons.org/licenses/by-sa/4.0/">CC BY-SA 4.0</a>.<br/>Apache Druid, Druid, and the Druid logo are either registered trademarks or trademarks of The Apache Software Foundation in the United States and other countries.</div></div></footer></div><script type="text/javascript" src="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.js"></script><script>
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UIs</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/operations/deep-storage-migration.html">Deep storage migration</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/operations/export-metadata.html">Export Metadata Tool</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/operations/metadata-migration.html">Metadata Migration</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/operations/segment-optimization.html">Segment Size Optimization</a></li><li class="navListItem"><a class="navItem" href="/docs/0.20.0/operations/use_sbt_to_build_fat_jar.html">Content for build.sbt</a></li></ul></div></ul></div><div class="navGroup"><h3 class="navGroupCategoryTitle collapsible">Development<span class="arrow"><svg width="24" height="24" viewBox="0 0 24 24"><path fill="#565656" d="M7.41 15.41L12 10.83l4.59 4.58L18 14l-6-6-6 6z"></path><path d="M0 0h24v24H0z" fill="none"></path></svg></span></h3><ul class="hide"><li 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+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
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+<p>This tutorial will demonstrate how to use transform specs to filter and transform input data during ingestion.</p>
+<p>For this tutorial, we'll assume you've already downloaded Apache Druid as described in
+the <a href="index.html">single-machine quickstart</a> and have it running on your local machine.</p>
+<p>It will also be helpful to have finished <a href="/docs/0.20.0/tutorials/tutorial-batch.html">Tutorial: Loading a file</a> and <a href="/docs/0.20.0/tutorials/tutorial-query.html">Tutorial: Querying data</a>.</p>
+<h2><a class="anchor" aria-hidden="true" id="sample-data"></a><a href="#sample-data" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Sample data</h2>
+<p>We've included sample data for this tutorial at <code>quickstart/tutorial/transform-data.json</code>, reproduced here for convenience:</p>
+<pre><code class="hljs css language-json">{<span class="hljs-attr">"timestamp"</span>:<span class="hljs-string">"2018-01-01T07:01:35Z"</span>,<span class="hljs-attr">"animal"</span>:<span class="hljs-string">"octopus"</span>,  <span class="hljs-attr">"location"</span>:<span class="hljs-number">1</span>, <span class="hljs-attr">"number"</span>:<span class="hljs-number">100</span>}
+{<span class="hljs-attr">"timestamp"</span>:<span class="hljs-string">"2018-01-01T05:01:35Z"</span>,<span class="hljs-attr">"animal"</span>:<span class="hljs-string">"mongoose"</span>, <span class="hljs-attr">"location"</span>:<span class="hljs-number">2</span>,<span class="hljs-attr">"number"</span>:<span class="hljs-number">200</span>}
+{<span class="hljs-attr">"timestamp"</span>:<span class="hljs-string">"2018-01-01T06:01:35Z"</span>,<span class="hljs-attr">"animal"</span>:<span class="hljs-string">"snake"</span>, <span class="hljs-attr">"location"</span>:<span class="hljs-number">3</span>, <span class="hljs-attr">"number"</span>:<span class="hljs-number">300</span>}
+{<span class="hljs-attr">"timestamp"</span>:<span class="hljs-string">"2018-01-01T01:01:35Z"</span>,<span class="hljs-attr">"animal"</span>:<span class="hljs-string">"lion"</span>, <span class="hljs-attr">"location"</span>:<span class="hljs-number">4</span>, <span class="hljs-attr">"number"</span>:<span class="hljs-number">300</span>}
+</code></pre>
+<h2><a class="anchor" aria-hidden="true" id="load-data-with-transform-specs"></a><a href="#load-data-with-transform-specs" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Load data with transform specs</h2>
+<p>We will ingest the sample data using the following spec, which demonstrates the use of transform specs:</p>
+<pre><code class="hljs css language-json">{
+  <span class="hljs-attr">"type"</span> : <span class="hljs-string">"index_parallel"</span>,
+  <span class="hljs-attr">"spec"</span> : {
+    <span class="hljs-attr">"dataSchema"</span> : {
+      <span class="hljs-attr">"dataSource"</span> : <span class="hljs-string">"transform-tutorial"</span>,
+      <span class="hljs-attr">"timestampSpec"</span>: {
+        <span class="hljs-attr">"column"</span>: <span class="hljs-string">"timestamp"</span>,
+        <span class="hljs-attr">"format"</span>: <span class="hljs-string">"iso"</span>
+      },
+      <span class="hljs-attr">"dimensionsSpec"</span> : {
+        <span class="hljs-attr">"dimensions"</span> : [
+          <span class="hljs-string">"animal"</span>,
+          { <span class="hljs-attr">"name"</span>: <span class="hljs-string">"location"</span>, <span class="hljs-attr">"type"</span>: <span class="hljs-string">"long"</span> }
+        ]
+      },
+      <span class="hljs-attr">"metricsSpec"</span> : [
+        { <span class="hljs-attr">"type"</span> : <span class="hljs-string">"count"</span>, <span class="hljs-attr">"name"</span> : <span class="hljs-string">"count"</span> },
+        { <span class="hljs-attr">"type"</span> : <span class="hljs-string">"longSum"</span>, <span class="hljs-attr">"name"</span> : <span class="hljs-string">"number"</span>, <span class="hljs-attr">"fieldName"</span> : <span class="hljs-string">"number"</span> },
+        { <span class="hljs-attr">"type"</span> : <span class="hljs-string">"longSum"</span>, <span class="hljs-attr">"name"</span> : <span class="hljs-string">"triple-number"</span>, <span class="hljs-attr">"fieldName"</span> : <span class="hljs-string">"triple-number"</span> }
+      ],
+      <span class="hljs-attr">"granularitySpec"</span> : {
+        <span class="hljs-attr">"type"</span> : <span class="hljs-string">"uniform"</span>,
+        <span class="hljs-attr">"segmentGranularity"</span> : <span class="hljs-string">"week"</span>,
+        <span class="hljs-attr">"queryGranularity"</span> : <span class="hljs-string">"minute"</span>,
+        <span class="hljs-attr">"intervals"</span> : [<span class="hljs-string">"2018-01-01/2018-01-03"</span>],
+        <span class="hljs-attr">"rollup"</span> : <span class="hljs-literal">true</span>
+      },
+      <span class="hljs-attr">"transformSpec"</span>: {
+        <span class="hljs-attr">"transforms"</span>: [
+          {
+            <span class="hljs-attr">"type"</span>: <span class="hljs-string">"expression"</span>,
+            <span class="hljs-attr">"name"</span>: <span class="hljs-string">"animal"</span>,
+            <span class="hljs-attr">"expression"</span>: <span class="hljs-string">"concat('super-', animal)"</span>
+          },
+          {
+            <span class="hljs-attr">"type"</span>: <span class="hljs-string">"expression"</span>,
+            <span class="hljs-attr">"name"</span>: <span class="hljs-string">"triple-number"</span>,
+            <span class="hljs-attr">"expression"</span>: <span class="hljs-string">"number * 3"</span>
+          }
+        ],
+        <span class="hljs-attr">"filter"</span>: {
+          <span class="hljs-attr">"type"</span>:<span class="hljs-string">"or"</span>,
+          <span class="hljs-attr">"fields"</span>: [
+            { <span class="hljs-attr">"type"</span>: <span class="hljs-string">"selector"</span>, <span class="hljs-attr">"dimension"</span>: <span class="hljs-string">"animal"</span>, <span class="hljs-attr">"value"</span>: <span class="hljs-string">"super-mongoose"</span> },
+            { <span class="hljs-attr">"type"</span>: <span class="hljs-string">"selector"</span>, <span class="hljs-attr">"dimension"</span>: <span class="hljs-string">"triple-number"</span>, <span class="hljs-attr">"value"</span>: <span class="hljs-string">"300"</span> },
+            { <span class="hljs-attr">"type"</span>: <span class="hljs-string">"selector"</span>, <span class="hljs-attr">"dimension"</span>: <span class="hljs-string">"location"</span>, <span class="hljs-attr">"value"</span>: <span class="hljs-string">"3"</span> }
+          ]
+        }
+      }
+    },
+    <span class="hljs-attr">"ioConfig"</span> : {
+      <span class="hljs-attr">"type"</span> : <span class="hljs-string">"index_parallel"</span>,
+      <span class="hljs-attr">"inputSource"</span> : {
+        <span class="hljs-attr">"type"</span> : <span class="hljs-string">"local"</span>,
+        <span class="hljs-attr">"baseDir"</span> : <span class="hljs-string">"quickstart/tutorial"</span>,
+        <span class="hljs-attr">"filter"</span> : <span class="hljs-string">"transform-data.json"</span>
+      },
+      <span class="hljs-attr">"inputFormat"</span> : {
+        <span class="hljs-attr">"type"</span> :<span class="hljs-string">"json"</span>
+      },
+      <span class="hljs-attr">"appendToExisting"</span> : <span class="hljs-literal">false</span>
+    },
+    <span class="hljs-attr">"tuningConfig"</span> : {
+      <span class="hljs-attr">"type"</span> : <span class="hljs-string">"index_parallel"</span>,
+      <span class="hljs-attr">"maxRowsPerSegment"</span> : <span class="hljs-number">5000000</span>,
+      <span class="hljs-attr">"maxRowsInMemory"</span> : <span class="hljs-number">25000</span>
+    }
+  }
+}
+</code></pre>
+<p>In the transform spec, we have two expression transforms:</p>
+<ul>
+<li><code>super-animal</code>: prepends &quot;super-&quot; to the values in the <code>animal</code> column. This will override the <code>animal</code> column with the transformed version, since the transform's name is <code>animal</code>.</li>
+<li><code>triple-number</code>: multiplies the <code>number</code> column by 3. This will create a new <code>triple-number</code> column. Note that we are ingesting both the original and the transformed column.</li>
+</ul>
+<p>Additionally, we have an OR filter with three clauses:</p>
+<ul>
+<li><code>super-animal</code> values that match &quot;super-mongoose&quot;</li>
+<li><code>triple-number</code> values that match 300</li>
+<li><code>location</code> values that match 3</li>
+</ul>
+<p>This filter selects the first 3 rows, and it will exclude the final &quot;lion&quot; row in the input data. Note that the filter is applied after the transformation.</p>
+<p>Let's submit this task now, which has been included at <code>quickstart/tutorial/transform-index.json</code>:</p>
+<pre><code class="hljs css language-bash">bin/post-index-task --file quickstart/tutorial/transform-index.json --url http://localhost:8081
+</code></pre>
+<h2><a class="anchor" aria-hidden="true" id="query-the-transformed-data"></a><a href="#query-the-transformed-data" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Query the transformed data</h2>
+<p>Let's run <code>bin/dsql</code> and issue a <code>select * from &quot;transform-tutorial&quot;;</code> query to see what was ingested:</p>
+<pre><code class="hljs css language-bash">dsql&gt; select * from <span class="hljs-string">"transform-tutorial"</span>;
+┌──────────────────────────┬────────────────┬───────┬──────────┬────────┬───────────────┐
+│ __time                   │ animal         │ count │ location │ number │ triple-number │
+├──────────────────────────┼────────────────┼───────┼──────────┼────────┼───────────────┤
+│ 2018-01-01T05:01:00.000Z │ super-mongoose │     1 │        2 │    200 │           600 │
+│ 2018-01-01T06:01:00.000Z │ super-snake    │     1 │        3 │    300 │           900 │
+│ 2018-01-01T07:01:00.000Z │ super-octopus  │     1 │        1 │    100 │           300 │
+└──────────────────────────┴────────────────┴───────┴──────────┴────────┴───────────────┘
+Retrieved 3 rows <span class="hljs-keyword">in</span> 0.03s.
+</code></pre>
+<p>The &quot;lion&quot; row has been discarded, the <code>animal</code> column has been transformed, and we have both the original and transformed <code>number</code> column.</p>
+</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/0.20.0/tutorials/tutorial-ingestion-spec.html"><span class="arrow-prev">← </span><span>Writing an ingestion spec</span></a><a class="docs-next button" href="/docs/0.20.0/tutorials/tutorial-kerberos-hadoop.html"><span>Kerberized HDFS deep storage</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#sample-data">Sample data</a></li><li><a href="#load-data-with-transform-specs">Load data with transform specs</a></li><li><a href="#query-the-transformed-data">Query the transformed data</a></li></ul></nav></div><footer class="nav-footer druid-footer" id="footer"><div class="container"><div class="text-center"><p><a href="/technology">Technology</a> · <a href="/use-cases">Use Cases</a> · <a href="/druid-powered">Powered by Druid</a> · <a href="/docs/0.20.0/latest">Docs</a> · <a href="/community/">Community</a> · <a href="/downloads.html">Download</a> · <a href="/faq">FAQ</a></p></div><div class="text-center"><a title="Join the user group" href="https://groups.google.com/forum/#!forum/druid-user" target="_blank"><span class="fa fa-comments"></span></a> · <a title="Follow Druid" href="https://twitter.com/druidio" target="_blank"><span class="fab fa-twitter"></span></a> · <a title="Download via Apache" href="https://www.apache.org/dyn/closer.cgi?path=/incubator/druid/{{ site.druid_versions[0].versions[0].version }}/apache-druid-{{ site.druid_versions[0].versions[0].version }}-bin.tar.gz" target="_blank"><span class="fas fa-feather"></span></a> · <a title="GitHub" href="https://github.com/apache/druid" target="_blank"><span class="fab fa-github"></span></a></div><div class="text-center license">Copyright © 2019 <a href="https://www.apache.org/" target="_blank">Apache Software Foundation</a>.<br/>Except where otherwise noted, licensed under <a rel="license" href="http://creativecommons.org/licenses/by-sa/4.0/">CC BY-SA 4.0</a>.<br/>Apache Druid, Druid, and the Druid logo are either registered trademarks or trademarks of The Apache Software Foundation in the United States and other countries.</div></div></footer></div><script type="text/javascript" src="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.js"></script><script>
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+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
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+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+  -->
+<p>This tutorial demonstrates how to update existing data, showing both overwrites and appends.</p>
+<p>For this tutorial, we'll assume you've already downloaded Apache Druid as described in
+the <a href="index.html">single-machine quickstart</a> and have it running on your local machine.</p>
+<p>It will also be helpful to have finished <a href="/docs/0.20.0/tutorials/tutorial-batch.html">Tutorial: Loading a file</a>, <a href="/docs/0.20.0/tutorials/tutorial-query.html">Tutorial: Querying data</a>, and <a href="/docs/0.20.0/tutorials/tutorial-rollup.html">Tutorial: Rollup</a>.</p>
+<h2><a class="anchor" aria-hidden="true" id="overwrite"></a><a href="#overwrite" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Overwrite</h2>
+<p>This section of the tutorial will cover how to overwrite an existing interval of data.</p>
+<h3><a class="anchor" aria-hidden="true" id="load-initial-data"></a><a href="#load-initial-data" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Load initial data</h3>
+<p>Let's load an initial data set which we will overwrite and append to.</p>
+<p>The spec we'll use for this tutorial is located at <code>quickstart/tutorial/updates-init-index.json</code>. This spec creates a datasource called <code>updates-tutorial</code> from the <code>quickstart/tutorial/updates-data.json</code> input file.</p>
+<p>Let's submit that task:</p>
+<pre><code class="hljs css language-bash">bin/post-index-task --file quickstart/tutorial/updates-init-index.json --url http://localhost:8081
+</code></pre>
+<p>We have three initial rows containing an &quot;animal&quot; dimension and &quot;number&quot; metric:</p>
+<pre><code class="hljs css language-bash">dsql&gt; select * from <span class="hljs-string">"updates-tutorial"</span>;
+┌──────────────────────────┬──────────┬───────┬────────┐
+│ __time                   │ animal   │ count │ number │
+├──────────────────────────┼──────────┼───────┼────────┤
+│ 2018-01-01T01:01:00.000Z │ tiger    │     1 │    100 │
+│ 2018-01-01T03:01:00.000Z │ aardvark │     1 │     42 │
+│ 2018-01-01T03:01:00.000Z │ giraffe  │     1 │  14124 │
+└──────────────────────────┴──────────┴───────┴────────┘
+Retrieved 3 rows <span class="hljs-keyword">in</span> 1.42s.
+</code></pre>
+<h3><a class="anchor" aria-hidden="true" id="overwrite-the-initial-data"></a><a href="#overwrite-the-initial-data" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Overwrite the initial data</h3>
+<p>To overwrite this data, we can submit another task for the same interval, but with different input data.</p>
+<p>The <code>quickstart/tutorial/updates-overwrite-index.json</code> spec will perform an overwrite on the <code>updates-tutorial</code> datasource.</p>
+<p>Note that this task reads input from <code>quickstart/tutorial/updates-data2.json</code>, and <code>appendToExisting</code> is set to <code>false</code> (indicating this is an overwrite).</p>
+<p>Let's submit that task:</p>
+<pre><code class="hljs css language-bash">bin/post-index-task --file quickstart/tutorial/updates-overwrite-index.json --url http://localhost:8081
+</code></pre>
+<p>When Druid finishes loading the new segment from this overwrite task, the &quot;tiger&quot; row now has the value &quot;lion&quot;, the &quot;aardvark&quot; row has a different number, and the &quot;giraffe&quot; row has been replaced. It may take a couple of minutes for the changes to take effect:</p>
+<pre><code class="hljs css language-bash">dsql&gt; select * from <span class="hljs-string">"updates-tutorial"</span>;
+┌──────────────────────────┬──────────┬───────┬────────┐
+│ __time                   │ animal   │ count │ number │
+├──────────────────────────┼──────────┼───────┼────────┤
+│ 2018-01-01T01:01:00.000Z │ lion     │     1 │    100 │
+│ 2018-01-01T03:01:00.000Z │ aardvark │     1 │   9999 │
+│ 2018-01-01T04:01:00.000Z │ bear     │     1 │    111 │
+└──────────────────────────┴──────────┴───────┴────────┘
+Retrieved 3 rows <span class="hljs-keyword">in</span> 0.02s.
+</code></pre>
+<h2><a class="anchor" aria-hidden="true" id="combine-old-data-with-new-data-and-overwrite"></a><a href="#combine-old-data-with-new-data-and-overwrite" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Combine old data with new data and overwrite</h2>
+<p>Let's try appending some new data to the <code>updates-tutorial</code> datasource now. We will add the data from <code>quickstart/tutorial/updates-data3.json</code>.</p>
+<p>The <code>quickstart/tutorial/updates-append-index.json</code> task spec has been configured to read from the existing <code>updates-tutorial</code> datasource and the <code>quickstart/tutorial/updates-data3.json</code> file. The task will combine data from the two input sources, and then overwrite the original data with the new combined data.</p>
+<p>Let's submit that task:</p>
+<pre><code class="hljs css language-bash">bin/post-index-task --file quickstart/tutorial/updates-append-index.json --url http://localhost:8081
+</code></pre>
+<p>When Druid finishes loading the new segment from this overwrite task, the new rows will have been added to the datasource. Note that roll-up occurred for the &quot;lion&quot; row:</p>
+<pre><code class="hljs css language-bash">dsql&gt; select * from <span class="hljs-string">"updates-tutorial"</span>;
+┌──────────────────────────┬──────────┬───────┬────────┐
+│ __time                   │ animal   │ count │ number │
+├──────────────────────────┼──────────┼───────┼────────┤
+│ 2018-01-01T01:01:00.000Z │ lion     │     2 │    400 │
+│ 2018-01-01T03:01:00.000Z │ aardvark │     1 │   9999 │
+│ 2018-01-01T04:01:00.000Z │ bear     │     1 │    111 │
+│ 2018-01-01T05:01:00.000Z │ mongoose │     1 │    737 │
+│ 2018-01-01T06:01:00.000Z │ snake    │     1 │   1234 │
+│ 2018-01-01T07:01:00.000Z │ octopus  │     1 │    115 │
+└──────────────────────────┴──────────┴───────┴────────┘
+Retrieved 6 rows <span class="hljs-keyword">in</span> 0.02s.
+</code></pre>
+<h2><a class="anchor" aria-hidden="true" id="append-to-the-data"></a><a href="#append-to-the-data" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Append to the data</h2>
+<p>Let's try another way of appending data.</p>
+<p>The <code>quickstart/tutorial/updates-append-index2.json</code> task spec reads input from <code>quickstart/tutorial/updates-data4.json</code> and will append its data to the <code>updates-tutorial</code> datasource. Note that <code>appendToExisting</code> is set to <code>true</code> in this spec.</p>
+<p>Let's submit that task:</p>
+<pre><code class="hljs css language-bash">bin/post-index-task --file quickstart/tutorial/updates-append-index2.json --url http://localhost:8081
+</code></pre>
+<p>When the new data is loaded, we can see two additional rows after &quot;octopus&quot;. Note that the new &quot;bear&quot; row with number 222 has not been rolled up with the existing bear-111 row, because the new data is held in a separate segment.</p>
+<pre><code class="hljs css language-bash">dsql&gt; select * from <span class="hljs-string">"updates-tutorial"</span>;
+┌──────────────────────────┬──────────┬───────┬────────┐
+│ __time                   │ animal   │ count │ number │
+├──────────────────────────┼──────────┼───────┼────────┤
+│ 2018-01-01T01:01:00.000Z │ lion     │     2 │    400 │
+│ 2018-01-01T03:01:00.000Z │ aardvark │     1 │   9999 │
+│ 2018-01-01T04:01:00.000Z │ bear     │     1 │    111 │
+│ 2018-01-01T05:01:00.000Z │ mongoose │     1 │    737 │
+│ 2018-01-01T06:01:00.000Z │ snake    │     1 │   1234 │
+│ 2018-01-01T07:01:00.000Z │ octopus  │     1 │    115 │
+│ 2018-01-01T04:01:00.000Z │ bear     │     1 │    222 │
+│ 2018-01-01T09:01:00.000Z │ falcon   │     1 │   1241 │
+└──────────────────────────┴──────────┴───────┴────────┘
+Retrieved 8 rows <span class="hljs-keyword">in</span> 0.02s.
+
+</code></pre>
+<p>If we run a GroupBy query instead of a <code>select *</code>, we can see that the &quot;bear&quot; rows will group together at query time:</p>
+<pre><code class="hljs css language-bash">dsql&gt; select __time, animal, SUM(<span class="hljs-string">"count"</span>), SUM(<span class="hljs-string">"number"</span>) from <span class="hljs-string">"updates-tutorial"</span> group by __time, animal;
+┌──────────────────────────┬──────────┬────────┬────────┐
+│ __time                   │ animal   │ EXPR<span class="hljs-variable">$2</span> │ EXPR<span class="hljs-variable">$3</span> │
+├──────────────────────────┼──────────┼────────┼────────┤
+│ 2018-01-01T01:01:00.000Z │ lion     │      2 │    400 │
+│ 2018-01-01T03:01:00.000Z │ aardvark │      1 │   9999 │
+│ 2018-01-01T04:01:00.000Z │ bear     │      2 │    333 │
+│ 2018-01-01T05:01:00.000Z │ mongoose │      1 │    737 │
+│ 2018-01-01T06:01:00.000Z │ snake    │      1 │   1234 │
+│ 2018-01-01T07:01:00.000Z │ octopus  │      1 │    115 │
+│ 2018-01-01T09:01:00.000Z │ falcon   │      1 │   1241 │
+└──────────────────────────┴──────────┴────────┴────────┘
+Retrieved 7 rows <span class="hljs-keyword">in</span> 0.23s.
+</code></pre>
+</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/0.20.0/tutorials/tutorial-retention.html"><span class="arrow-prev">← </span><span>Configuring data retention</span></a><a class="docs-next button" href="/docs/0.20.0/tutorials/tutorial-compaction.html"><span>Compacting segments</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#overwrite">Overwrite</a><ul class="toc-headings"><li><a href="#load-initial-data">Load initial data</a></li><li><a href="#overwrite-the-initial-data">Overwrite the initial data</a></li></ul></li><li><a href="#combine-old-data-with-new-data-and-overwrite">Combine old data with new data and overwrite</a></li><li><a href="#append-to-the-data">Append to the data</a></li></ul></nav></div><footer class="nav-footer druid-footer" id="footer"><div class="container"><div class="text-center"><p><a href="/technology">Technology</a> · <a href="/use-cases">Use Cases</a> · <a href="/druid-powered">Powered by Druid</a> · <a href="/docs/0.20.0/latest">Docs</a> · <a href="/community/">Community</a> · <a href="/downloads.html">Download</a> · <a href="/faq">FAQ</a></p></div><div class="text-center"><a title="Join the user group" href="https://groups.google.com/forum/#!forum/druid-user" target="_blank"><span class="fa fa-comments"></span></a> · <a title="Follow Druid" href="https://twitter.com/druidio" target="_blank"><span class="fab fa-twitter"></span></a> · <a title="Download via Apache" href="https://www.apache.org/dyn/closer.cgi?path=/incubator/druid/{{ site.druid_versions[0].versions[0].version }}/apache-druid-{{ site.druid_versions[0].versions[0].version }}-bin.tar.gz" target="_blank"><span class="fas fa-feather"></span></a> · <a title="GitHub" href="https://github.com/apache/druid" target="_blank"><span class="fab fa-github"></span></a></div><div class="text-center license">Copyright © 2019 <a href="https://www.apache.org/" target="_blank">Apache Software Foundation</a>.<br/>Except where otherwise noted, licensed under <a rel="license" href="http://creativecommons.org/licenses/by-sa/4.0/">CC BY-SA 4.0</a>.<br/>Apache Druid, Druid, and the Druid logo are either registered trademarks or trademarks of The Apache Software Foundation in the United States and other countries.</div></div></footer></div><script type="text/javascript" src="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.js"></script><script>
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diff --git a/docs/latest/comparisons/druid-vs-elasticsearch.html b/docs/latest/comparisons/druid-vs-elasticsearch.html
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diff --git a/docs/latest/configuration/human-readable-byte.html b/docs/latest/configuration/human-readable-byte.html
new file mode 100644
index 0000000..bb632e9
--- /dev/null
+++ b/docs/latest/configuration/human-readable-byte.html
@@ -0,0 +1,88 @@
+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Human-readable Byte Configuration Reference · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/configuration/human-readable-byte.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.20.0" /><meta property="og:title" content="Human-readable Byte Configuration Reference · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
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+  ~ Licensed to the Apache Software Foundation (ASF) under one
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+  ~ under the License.
+  -->
+<p>This page documents configuration properties related to bytes.</p>
+<p>These properties can be configured through 2 ways:</p>
+<ol>
+<li>a simple number in bytes</li>
+<li>a number with a unit suffix</li>
+</ol>
+<h2><a class="anchor" aria-hidden="true" id="a-number-in-bytes"></a><a href="#a-number-in-bytes" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>A number in bytes</h2>
+<p>Given that cache size is 3G, there's a configuration as below</p>
+<pre><code class="hljs css language-properties"><span class="hljs-comment"># 3G bytes = 3_000_000_000 bytes</span>
+<span class="hljs-meta">druid.cache.sizeInBytes</span>=<span class="hljs-string">3000000000 </span>
+</code></pre>
+<h2><a class="anchor" aria-hidden="true" id="a-number-with-a-unit-suffix"></a><a href="#a-number-with-a-unit-suffix" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>A number with a unit suffix</h2>
+<p>When you have to put a large number for some configuration as above, it is easy to make a mistake such as extra or missing 0s. Druid supports a better way, a number with a unit suffix.</p>
+<p>Given a disk of 1T, the configuration can be</p>
+<pre><code class="hljs css language-properties"><span class="hljs-meta">druid.segmentCache.locations</span>=<span class="hljs-string">[{"path":"/segment-cache","maxSize":"1t"}]</span>
+</code></pre>
+<p>Note: in above example, both <code>1t</code> and <code>1T</code> are acceptable since it's case-insensitive.</p>
+<h3><a class="anchor" aria-hidden="true" id="supported-units"></a><a href="#supported-units" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Supported Units</h3>
+<p>In the world of computer, a unit like <code>K</code> is ambiguous. It means 1000 or 1024 in different contexts, for more information please see <a href="https://en.wikipedia.org/wiki/Binary_prefix">Here</a>.</p>
+<p>To make it clear, the base of units are defined in Druid as below</p>
+<table>
+<thead>
+<tr><th>Unit</th><th>Description</th><th>Base</th></tr>
+</thead>
+<tbody>
+<tr><td>K</td><td>Kilo Decimal Byte</td><td>1_000</td></tr>
+<tr><td>M</td><td>Mega Decimal Byte</td><td>1_000_000</td></tr>
+<tr><td>G</td><td>Giga Decimal Byte</td><td>1_000_000_000</td></tr>
+<tr><td>T</td><td>Tera Decimal Byte</td><td>1_000_000_000_000</td></tr>
+<tr><td>P</td><td>Peta Decimal Byte</td><td>1_000_000_000_000_000</td></tr>
+<tr><td>KiB</td><td>Kilo Binary Byte</td><td>1024</td></tr>
+<tr><td>MiB</td><td>Mega Binary Byte</td><td>1024 * 1024</td></tr>
+<tr><td>GiB</td><td>Giga Binary Byte</td><td>1024 * 1024 * 1024</td></tr>
+<tr><td>TiB</td><td>Tera Binary Byte</td><td>1024 * 1024 * 1024 * 1024</td></tr>
+<tr><td>PiB</td><td>Peta Binary Byte</td><td>1024 * 1024 * 1024 * 1024 * 1024</td></tr>
+</tbody>
+</table>
+<p>Unit is case-insensitive. <code>k</code>, <code>kib</code>, <code>KiB</code>, <code>kiB</code> are all acceptable.</p>
+<p>Here are two examples</p>
+<pre><code class="hljs css language-properties"><span class="hljs-comment"># 1G bytes = 1_000_000_000 bytes</span>
+<span class="hljs-meta">druid.cache.sizeInBytes</span>=<span class="hljs-string">1g </span>
+</code></pre>
+<pre><code class="hljs css language-properties"><span class="hljs-comment"># 256MiB bytes = 256 * 1024 * 1024 bytes</span>
+<span class="hljs-meta">druid.cache.sizeInBytes</span>=<span class="hljs-string">256MiB </span>
+</code></pre>
+</span></div></article></div><div class="docs-prevnext"></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#a-number-in-bytes">A number in bytes</a></li><li><a href="#a-number-with-a-unit-suffix">A number with a unit suffix</a><ul class="toc-headings"><li><a href="#supported-units">Supported Units</a></li></ul></li></ul></nav></div><footer class="nav-footer druid-footer" id="footer"><div class="container"><div class="text-center"><p><a href="/technology">Technology</a> · <a href="/use-cases">Use Cases</a> · <a href="/druid-powered">Powered by Druid</a> · <a href="/docs/latest/latest">Docs</a> · <a href="/community/">Community</a> · <a href="/downloads.html">Download</a> · <a href="/faq">FAQ</a></p></div><div class="text-center"><a title="Join the user group" href="https://groups.google.com/forum/#!forum/druid-user" target="_blank"><span class="fa fa-comments"></span></a> · <a title="Follow Druid" href="https://twitter.com/druidio" target="_blank"><span class="fab fa-twitter"></span></a> · <a title="Download via Apache" href="https://www.apache.org/dyn/closer.cgi?path=/incubator/druid/{{ site.druid_versions[0].versions[0].version }}/apache-druid-{{ site.druid_versions[0].versions[0].version }}-bin.tar.gz" target="_blank"><span class="fas fa-feather"></span></a> · <a title="GitHub" href="https://github.com/apache/druid" target="_blank"><span class="fab fa-github"></span></a></div><div class="text-center license">Copyright © 2019 <a href="https://www.apache.org/" target="_blank">Apache Software Foundation</a>.<br/>Except where otherwise noted, licensed under <a rel="license" href="http://creativecommons.org/licenses/by-sa/4.0/">CC BY-SA 4.0</a>.<br/>Apache Druid, Druid, and the Druid logo are either registered trademarks or trademarks of The Apache Software Foundation in the United States and other countries.</div></div></footer></div><script type="text/javascript" src="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.js"></script><script>
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diff --git a/docs/latest/configuration/index.html b/docs/latest/configuration/index.html
index 69cfcf9..d24c96e 100644
--- a/docs/latest/configuration/index.html
+++ b/docs/latest/configuration/index.html
@@ -1,4 +1,4 @@
-<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Configuration reference · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/configuration/index.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.19.0" /><meta property="og:title" content="Configuration reference · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Configuration reference · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/configuration/index.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.20.0" /><meta property="og:title" content="Configuration reference · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
               window.dataLayer = window.dataLayer || [];
               function gtag(){dataLayer.push(arguments); }
               gtag('js', new Date());
@@ -415,6 +415,17 @@
 <tr><td><code>druid.request.logging.sqlQueryLogger</code></td><td>request logger for emitting SQL query's request logs.</td><td>none</td></tr>
 </tbody>
 </table>
+<h3><a class="anchor" aria-hidden="true" id="audit-logging"></a><a href="#audit-logging" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Audit Logging</h3>
+<p>Coordinator and Overlord log changes to lookups, segment load/drop rules, dynamic configuration changes for auditing</p>
+<table>
+<thead>
+<tr><th>Property</th><th>Description</th><th>Default</th></tr>
+</thead>
+<tbody>
+<tr><td><code>druid.audit.manager.auditHistoryMillis</code></td><td>Default duration for querying audit history.</td><td>1 week</td></tr>
+<tr><td><code>druid.audit.manager.includePayloadAsDimensionInMetric</code></td><td>Boolean flag on whether to add <code>payload</code> column in service metric.</td><td>false</td></tr>
+</tbody>
+</table>
 <h3><a class="anchor" aria-hidden="true" id="enabling-metrics"></a><a href="#enabling-metrics" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Enabling Metrics</h3>
 <p>Druid processes periodically emit metrics and different metrics monitors can be included. Each process can overwrite the default list of monitors.</p>
 <table>
@@ -883,7 +894,7 @@
   <span class="hljs-attr">"killDataSourceWhitelist"</span>: [<span class="hljs-string">"wikipedia"</span>, <span class="hljs-string">"testDatasource"</span>],
   <span class="hljs-attr">"decommissioningNodes"</span>: [<span class="hljs-string">"localhost:8182"</span>, <span class="hljs-string">"localhost:8282"</span>],
   <span class="hljs-attr">"decommissioningMaxPercentOfMaxSegmentsToMove"</span>: <span class="hljs-number">70</span>,
-  <span class="hljs-attr">"pauseCoordinator"</span>: <span class="hljs-literal">false</span>
+  <span class="hljs-attr">"pauseCoordination"</span>: <span class="hljs-literal">false</span>
 }
 </code></pre>
 <p>Issuing a GET request at the same URL will return the spec that is currently in place. A description of the config setup spec is shown below.</p>
@@ -906,7 +917,7 @@
 <tr><td><code>maxSegmentsInNodeLoadingQueue</code></td><td>The maximum number of segments that could be queued for loading to any given server. This parameter could be used to speed up segments loading process, especially if there are &quot;slow&quot; nodes in the cluster (with low loading speed) or if too much segments scheduled to be replicated to some particular node (faster loading could be preferred to better segments distribution). Desired value depends on segments loading speed, acceptable replication time and number of nodes. Value 1000 could be a start point for a rather big cluster. Default value is 0 (loading queue is unbounded)</td><td>0</td></tr>
 <tr><td><code>decommissioningNodes</code></td><td>List of historical servers to 'decommission'. Coordinator will not assign new segments to 'decommissioning' servers,  and segments will be moved away from them to be placed on non-decommissioning servers at the maximum rate specified by <code>decommissioningMaxPercentOfMaxSegmentsToMove</code>.</td><td>none</td></tr>
 <tr><td><code>decommissioningMaxPercentOfMaxSegmentsToMove</code></td><td>The maximum number of segments that may be moved away from 'decommissioning' servers to non-decommissioning (that is, active) servers during one Coordinator run. This value is relative to the total maximum segment movements allowed during one run which is determined by <code>maxSegmentsToMove</code>. If <code>decommissioningMaxPercentOfMaxSegmentsToMove</code> is 0, segments will neither be moved from <em>or to</em> 'decommissioning' servers, effectively putting them in a sort of &quot;maintenance&quot; mode that will not participate in balancing or assignment by load rules. Decommissioning can also become stalled if there are no available active servers to place the segments. By leveraging the maximum percent of decommissioning segment movements, an operator can prevent active servers from overload by prioritizing balancing, or decrease decommissioning time instead. The value should be between 0 and 100.</td><td>70</td></tr>
-<tr><td><code>pauseCoordinator</code></td><td>Boolean flag for whether or not the coordinator should execute its various duties of coordinating the cluster. Setting this to true essentially pauses all coordination work while allowing the API to remain up. Duties that are paused include all classes that implement the <code>CoordinatorDuty</code> Interface. Such duties include: Segment balancing, Segment compaction, Emission of metrics controlled by the dynamic coordinator config <code>emitBalancingStats</code>, Submitting kill tasks for unused segments (if enabled), Logging of used segments in the cluster, Marking of newly unused or overshadowed segments, Matching and execution of load/drop rules for used segments, Unloading segments that are no longer marked as used from Historical servers. An example of when an admin may want to pause coordination would be if they are doing deep storage maintenance on HDFS Name Nodes with downtime and don't want the coordinator to be directing Historical Nodes to hit the Name Node with API requests until maintenance is done and the deep store is declared healthy for use again.</td><td>false</td></tr>
+<tr><td><code>pauseCoordination</code></td><td>Boolean flag for whether or not the coordinator should execute its various duties of coordinating the cluster. Setting this to true essentially pauses all coordination work while allowing the API to remain up. Duties that are paused include all classes that implement the <code>CoordinatorDuty</code> Interface. Such duties include: Segment balancing, Segment compaction, Emission of metrics controlled by the dynamic coordinator config <code>emitBalancingStats</code>, Submitting kill tasks for unused segments (if enabled), Logging of used segments in the cluster, Marking of newly unused or overshadowed segments, Matching and execution of load/drop rules for used segments, Unloading segments that are no longer marked as used from Historical servers. An example of when an admin may want to pause coordination would be if they are doing deep storage maintenance on HDFS Name Nodes with downtime and don't want the coordinator to be directing Historical Nodes to hit the Name Node with API requests until maintenance is done and the deep store is declared healthy for use again.</td><td>false</td></tr>
 </tbody>
 </table>
 <p>To view the audit history of Coordinator dynamic config issue a GET request to the URL -</p>
@@ -962,19 +973,30 @@
 This kind of problem may happen especially in Kafka/Kinesis indexing systems which allow late data arrival.
 If you see this problem, it's recommended to set <code>skipOffsetFromLatest</code> to some large enough value to avoid such conflicts between compaction tasks and realtime tasks.</p>
 <h6><a class="anchor" aria-hidden="true" id="compaction-tuningconfig"></a><a href="#compaction-tuningconfig" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Compaction TuningConfig</h6>
+<p>Auto compaction supports a subset of the <a href="/docs/latest/ingestion/native-batch.html#tuningconfig">tuningConfig for Parallel task</a>.
+The below is a list of the supported configurations for auto compaction.</p>
 <table>
 <thead>
 <tr><th>Property</th><th>Description</th><th>Required</th></tr>
 </thead>
 <tbody>
-<tr><td><code>maxRowsInMemory</code></td><td>See <a href="/docs/latest/ingestion/native-batch.html#tuningconfig">tuningConfig for indexTask</a></td><td>no (default = 1000000)</td></tr>
-<tr><td><code>maxBytesInMemory</code></td><td>See <a href="/docs/latest/ingestion/native-batch.html#tuningconfig">tuningConfig for indexTask</a></td><td>no (1/6 of max JVM memory)</td></tr>
-<tr><td><code>maxTotalRows</code></td><td>See <a href="/docs/latest/ingestion/native-batch.html#tuningconfig">tuningConfig for indexTask</a></td><td>no (default = 20000000)</td></tr>
-<tr><td><code>splitHintSpec</code></td><td>See <a href="/docs/latest/ingestion/native-batch.html#tuningconfig">tuningConfig for indexTask</a></td><td>no (default = null)</td></tr>
-<tr><td><code>indexSpec</code></td><td>See <a href="/docs/latest/ingestion/index.html#indexspec">IndexSpec</a></td><td>no</td></tr>
-<tr><td><code>maxPendingPersists</code></td><td>See <a href="/docs/latest/ingestion/native-batch.html#tuningconfig">tuningConfig for indexTask</a></td><td>no (default = 0 (meaning one persist can be running concurrently with ingestion, and none can be queued up))</td></tr>
-<tr><td><code>pushTimeout</code></td><td>See <a href="/docs/latest/ingestion/native-batch.html#tuningconfig">tuningConfig for indexTask</a></td><td>no (default = 0)</td></tr>
-<tr><td><code>maxNumConcurrentSubTasks</code></td><td>See <a href="/docs/latest/ingestion/native-batch.html#tuningconfig">tuningConfig for indexTask</a></td><td>no (default = 1)</td></tr>
+<tr><td>type</td><td>The task type, this should always be <code>index_parallel</code>.</td><td>yes</td></tr>
+<tr><td><code>maxRowsInMemory</code></td><td>Used in determining when intermediate persists to disk should occur. Normally user does not need to set this, but depending on the nature of data, if rows are short in terms of bytes, user may not want to store a million rows in memory and this value should be set.</td><td>no (default = 1000000)</td></tr>
+<tr><td><code>maxBytesInMemory</code></td><td>Used in determining when intermediate persists to disk should occur. Normally this is computed internally and user does not need to set it. This value represents number of bytes to aggregate in heap memory before persisting. This is based on a rough estimate of memory usage and not actual usage. The maximum heap memory usage for indexing is <code>maxBytesInMemory</code> * (2 + <code>maxPendingPersists</code>)</td><td>no (default = 1/6 of max JVM memory)</td></tr>
+<tr><td><code>splitHintSpec</code></td><td>Used to give a hint to control the amount of data that each first phase task reads. This hint could be ignored depending on the implementation of the input source. See <a href="/docs/latest/ingestion/native-batch.html#split-hint-spec">Split hint spec</a> for more details.</td><td>no (default = size-based split hint spec)</td></tr>
+<tr><td><code>partitionsSpec</code></td><td>Defines how to partition data in each time chunk, see <a href="/docs/latest/ingestion/native-batch.html#partitionsspec"><code>PartitionsSpec</code></a></td><td>no (default = <code>dynamic</code>)</td></tr>
+<tr><td><code>indexSpec</code></td><td>Defines segment storage format options to be used at indexing time, see <a href="/docs/latest/ingestion/index.html#indexspec">IndexSpec</a></td><td>no</td></tr>
+<tr><td><code>indexSpecForIntermediatePersists</code></td><td>Defines segment storage format options to be used at indexing time for intermediate persisted temporary segments. this can be used to disable dimension/metric compression on intermediate segments to reduce memory required for final merging. however, disabling compression on intermediate segments might increase page cache use while they are used before getting merged into final segment published, see <a href="/docs/latest/ingestion/index.html#indexspec">IndexSpec</a> for possible values.</td><td>no</td></tr>
+<tr><td><code>maxPendingPersists</code></td><td>Maximum number of persists that can be pending but not started. If this limit would be exceeded by a new intermediate persist, ingestion will block until the currently-running persist finishes. Maximum heap memory usage for indexing scales with <code>maxRowsInMemory</code> * (2 + <code>maxPendingPersists</code>).</td><td>no (default = 0, meaning one persist can be running concurrently with ingestion, and none can be queued up)</td></tr>
+<tr><td><code>pushTimeout</code></td><td>Milliseconds to wait for pushing segments. It must be &gt;= 0, where 0 means to wait forever.</td><td>no (default = 0)</td></tr>
+<tr><td><code>segmentWriteOutMediumFactory</code></td><td>Segment write-out medium to use when creating segments. See <a href="/docs/latest/ingestion/native-batch.html#segmentwriteoutmediumfactory">SegmentWriteOutMediumFactory</a>.</td><td>no (default is the value from <code>druid.peon.defaultSegmentWriteOutMediumFactory.type</code> is used)</td></tr>
+<tr><td><code>maxNumConcurrentSubTasks</code></td><td>Maximum number of worker tasks which can be run in parallel at the same time. The supervisor task would spawn worker tasks up to <code>maxNumConcurrentSubTasks</code> regardless of the current available task slots. If this value is set to 1, the supervisor task processes data ingestion on its own instead of spawning worker tasks. If this value is set to too large, too many worker tasks can be created which might block other ingestion. Check <a href="/docs/latest/ingestion/native-batch.html#capacity-planning">Capacity Planning</a> for more details.</td><td>no (default = 1)</td></tr>
+<tr><td><code>maxRetry</code></td><td>Maximum number of retries on task failures.</td><td>no (default = 3)</td></tr>
+<tr><td><code>maxNumSegmentsToMerge</code></td><td>Max limit for the number of segments that a single task can merge at the same time in the second phase. Used only with <code>hashed</code> or <code>single_dim</code> partitionsSpec.</td><td>no (default = 100)</td></tr>
+<tr><td><code>totalNumMergeTasks</code></td><td>Total number of tasks to merge segments in the merge phase when <code>partitionsSpec</code> is set to <code>hashed</code> or <code>single_dim</code>.</td><td>no (default = 10)</td></tr>
+<tr><td><code>taskStatusCheckPeriodMs</code></td><td>Polling period in milliseconds to check running task statuses.</td><td>no (default = 1000)</td></tr>
+<tr><td><code>chatHandlerTimeout</code></td><td>Timeout for reporting the pushed segments in worker tasks.</td><td>no (default = PT10S)</td></tr>
+<tr><td><code>chatHandlerNumRetries</code></td><td>Retries for reporting the pushed segments in worker tasks.</td><td>no (default = 5)</td></tr>
 </tbody>
 </table>
 <h3><a class="anchor" aria-hidden="true" id="overlord"></a><a href="#overlord" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Overlord</h3>
@@ -1019,7 +1041,7 @@
 <tr><td><code>druid.indexer.runner.taskAssignmentTimeout</code></td><td>How long to wait after a task as been assigned to a MiddleManager before throwing an error.</td><td>PT5M</td></tr>
 <tr><td><code>druid.indexer.runner.minWorkerVersion</code></td><td>The minimum MiddleManager version to send tasks to.</td><td>&quot;0&quot;</td></tr>
 <tr><td><code>druid.indexer.runner.compressZnodes</code></td><td>Indicates whether or not the Overlord should expect MiddleManagers to compress Znodes.</td><td>true</td></tr>
-<tr><td><code>druid.indexer.runner.maxZnodeBytes</code></td><td>The maximum size Znode in bytes that can be created in Zookeeper.</td><td>524288</td></tr>
+<tr><td><code>druid.indexer.runner.maxZnodeBytes</code></td><td>The maximum size Znode in bytes that can be created in Zookeeper. Human-readable format is supported, see <a href="/docs/latest/configuration/human-readable-byte.html">here</a>.</td><td>512 KiB</td></tr>
 <tr><td><code>druid.indexer.runner.taskCleanupTimeout</code></td><td>How long to wait before failing a task after a MiddleManager is disconnected from Zookeeper.</td><td>PT15M</td></tr>
 <tr><td><code>druid.indexer.runner.taskShutdownLinkTimeout</code></td><td>How long to wait on a shutdown request to a MiddleManager before timing out</td><td>PT1M</td></tr>
 <tr><td><code>druid.indexer.runner.pendingTasksRunnerNumThreads</code></td><td>Number of threads to allocate pending-tasks to workers, must be at least 1.</td><td>1</td></tr>
@@ -1325,7 +1347,7 @@
 <tr><th>Property</th><th>Description</th><th>Default</th></tr>
 </thead>
 <tbody>
-<tr><td><code>druid.processing.buffer.sizeBytes</code></td><td>This specifies a buffer size for the storage of intermediate results. The computation engine in both the Historical and Realtime processes will use a scratch buffer of this size to do all of their intermediate computations off-heap. Larger values allow for more aggregations in a single pass over the data while smaller values can require more passes depending on the query that is being executed.</td><td>auto (max 1GB)</td></tr>
+<tr><td><code>druid.processing.buffer.sizeBytes</code></td><td>This specifies a buffer size for the storage of intermediate results. The computation engine in both the Historical and Realtime processes will use a scratch buffer of this size to do all of their intermediate computations off-heap. Larger values allow for more aggregations in a single pass over the data while smaller values can require more passes depending on the query that is being executed. Human-readable format is supported, see <a href="/docs/latest/configuration/human-readable-byte.html">here</a>.</td><td>auto (max 1 GiB)</td></tr>
 <tr><td><code>druid.processing.buffer.poolCacheMaxCount</code></td><td>processing buffer pool caches the buffers for later use, this is the maximum count cache will grow to. note that pool can create more buffers than it can cache if necessary.</td><td>Integer.MAX_VALUE</td></tr>
 <tr><td><code>druid.processing.formatString</code></td><td>Realtime and Historical processes use this format string to name their processing threads.</td><td>processing-%s</td></tr>
 <tr><td><code>druid.processing.numMergeBuffers</code></td><td>The number of direct memory buffers available for merging query results. The buffers are sized by <code>druid.processing.buffer.sizeBytes</code>. This property is effectively a concurrency limit for queries that require merging buffers. If you are using any queries that require merge buffers (currently, just groupBy v2) then you should have at least two of these.</td><td><code>max(2, druid.processing.numThreads / 4)</code></td></tr>
@@ -1528,7 +1550,7 @@
 <tr><th>Property</th><th>Description</th><th>Default</th></tr>
 </thead>
 <tbody>
-<tr><td><code>druid.server.maxSize</code></td><td>The maximum number of bytes-worth of segments that the process wants assigned to it. The Coordinator process will attempt to assign segments to a Historical process only if this property is greater than the total size of segments served by it. Since this property defines the upper limit on the total segment size that can be assigned to a Historical, it can be set to the sum of all <code>maxSize</code> values specified within <code>druid.segmentCache.locations</code> property.</td><td>0</td></tr>
+<tr><td><code>druid.server.maxSize</code></td><td>The maximum number of bytes-worth of segments that the process wants assigned to it. The Coordinator process will attempt to assign segments to a Historical process only if this property is greater than the total size of segments served by it. Since this property defines the upper limit on the total segment size that can be assigned to a Historical, it is defaulted to the sum of all <code>maxSize</code> values specified within <code>druid.segmentCache.locations</code> property. Human-readable format is supported, see <a href="/docs/latest/configuration/human-readable-byte.html">here</a>.</td><td>Sum of <code>maxSize</code> values defined within <code>druid.segmentCache.locations</code></td></tr>
 <tr><td><code>druid.server.tier</code></td><td>A string to name the distribution tier that the storage process belongs to. Many of the <a href="/docs/latest/operations/rule-configuration.html">rules Coordinator processes use</a> to manage segments can be keyed on tiers.</td><td><code>_default_tier</code></td></tr>
 <tr><td><code>druid.server.priority</code></td><td>In a tiered architecture, the priority of the tier, thus allowing control over which processes are queried. Higher numbers mean higher priority. The default (no priority) works for architecture with no cross replication (tiers that have no data-storage overlap). Data centers typically have equal priority.</td><td>0</td></tr>
 </tbody>
@@ -1539,7 +1561,7 @@
 <tr><th>Property</th><th>Description</th><th>Default</th></tr>
 </thead>
 <tbody>
-<tr><td><code>druid.segmentCache.locations</code></td><td>Segments assigned to a Historical process are first stored on the local file system (in a disk cache) and then served by the Historical process. These locations define where that local cache resides. This value cannot be NULL or EMPTY. Here is an example <code>druid.segmentCache.locations=[{&quot;path&quot;: &quot;/mnt/druidSegments&quot;, &quot;maxSize&quot;: 10000, &quot;freeSpacePercent&quot;: 1.0}]</code>. &quot;freeSpacePercent&quot; is optional, if provided then enforces that much of free disk partition space while storing segments. But, it depends on File.getTotalSpace() and File.getFreeSpace() methods, so enable if only if they work for your File System.</td><td>none</td></tr>
+<tr><td><code>druid.segmentCache.locations</code></td><td>Segments assigned to a Historical process are first stored on the local file system (in a disk cache) and then served by the Historical process. These locations define where that local cache resides. This value cannot be NULL or EMPTY. Here is an example <code>druid.segmentCache.locations=[{&quot;path&quot;: &quot;/mnt/druidSegments&quot;, &quot;maxSize&quot;: &quot;10k&quot;, &quot;freeSpacePercent&quot;: 1.0}]</code>. &quot;freeSpacePercent&quot; is optional, if provided then enforces that much of free disk partition space while storing segments. But, it depends on File.getTotalSpace() and File.getFreeSpace() methods, so enable if only if they work for your File System.</td><td>none</td></tr>
 <tr><td><code>druid.segmentCache.locationSelectorStrategy</code></td><td>The strategy used to select a location from the configured <code>druid.segmentCache.locations</code> for segment distribution. Possible values are <code>leastBytesUsed</code>, <code>roundRobin</code>, <code>random</code>, or <code>mostAvailableSize</code>.</td><td>leastBytesUsed</td></tr>
 <tr><td><code>druid.segmentCache.deleteOnRemove</code></td><td>Delete segment files from cache once a process is no longer serving a segment.</td><td>true</td></tr>
 <tr><td><code>druid.segmentCache.dropSegmentDelayMillis</code></td><td>How long a process delays before completely dropping segment.</td><td>30000 (30 seconds)</td></tr>
@@ -1718,7 +1740,7 @@
 <tr><td><code>druid.server.http.maxIdleTime</code></td><td>The Jetty max idle time for a connection.</td><td>PT5M</td></tr>
 <tr><td><code>druid.server.http.enableRequestLimit</code></td><td>If enabled, no requests would be queued in jetty queue and &quot;HTTP 429 Too Many Requests&quot; error response would be sent.</td><td>false</td></tr>
 <tr><td><code>druid.server.http.defaultQueryTimeout</code></td><td>Query timeout in millis, beyond which unfinished queries will be cancelled</td><td>300000</td></tr>
-<tr><td><code>druid.server.http.maxScatterGatherBytes</code></td><td>Maximum number of bytes gathered from data processes such as Historicals and realtime processes to execute a query. Queries that exceed this limit will fail. This is an advance configuration that allows to protect in case Broker is under heavy load and not utilizing the data gathered in memory fast enough and leading to OOMs. This limit can be further reduced at query time using <code>maxScatterGatherBytes</code> in the context. Note that having large limit is not necessarily bad if broker is never under heavy concurrent load in which case data gathered is processed quickly and freeing up the memory used.</td><td>Long.MAX_VALUE</td></tr>
+<tr><td><code>druid.server.http.maxScatterGatherBytes</code></td><td>Maximum number of bytes gathered from data processes such as Historicals and realtime processes to execute a query. Queries that exceed this limit will fail. This is an advance configuration that allows to protect in case Broker is under heavy load and not utilizing the data gathered in memory fast enough and leading to OOMs. This limit can be further reduced at query time using <code>maxScatterGatherBytes</code> in the context. Note that having large limit is not necessarily bad if broker is never under heavy concurrent load in which case data gathered is processed quickly and freeing up the memory used. Human-readable format is supported, see <a href="/docs/latest/configuration/human-readable-byte.html">here</a>.</td><td>Long.MAX_VALUE</td></tr>
 <tr><td><code>druid.server.http.maxSubqueryRows</code></td><td>Maximum number of rows from subqueries per query. These rows are stored in memory.</td><td>100000</td></tr>
 <tr><td><code>druid.server.http.gracefulShutdownTimeout</code></td><td>The maximum amount of time Jetty waits after receiving shutdown signal. After this timeout the threads will be forcefully shutdown. This allows any queries that are executing to complete.</td><td><code>PT0S</code> (do not wait)</td></tr>
 <tr><td><code>druid.server.http.unannouncePropagationDelay</code></td><td>How long to wait for zookeeper unannouncements to propagate before shutting down Jetty. This is a minimum and <code>druid.server.http.gracefulShutdownTimeout</code> does not start counting down until after this period elapses.</td><td><code>PT0S</code> (do not wait)</td></tr>
@@ -1738,7 +1760,7 @@
 <tr><td><code>druid.broker.http.compressionCodec</code></td><td>Compression codec the Broker uses to communicate with Historical and real-time processes. May be &quot;gzip&quot; or &quot;identity&quot;.</td><td><code>gzip</code></td></tr>
 <tr><td><code>druid.broker.http.readTimeout</code></td><td>The timeout for data reads from Historical servers and real-time tasks.</td><td><code>PT15M</code></td></tr>
 <tr><td><code>druid.broker.http.unusedConnectionTimeout</code></td><td>The timeout for idle connections in connection pool. The connection in the pool will be closed after this timeout and a new one will be established. This timeout should be less than <code>druid.broker.http.readTimeout</code>. Set this timeout = ~90% of <code>druid.broker.http.readTimeout</code></td><td><code>PT4M</code></td></tr>
-<tr><td><code>druid.broker.http.maxQueuedBytes</code></td><td>Maximum number of bytes queued per query before exerting backpressure on the channel to the data server. Similar to <code>druid.server.http.maxScatterGatherBytes</code>, except unlike that configuration, this one will trigger backpressure rather than query failure. Zero means disabled. Can be overridden by the <a href="/docs/latest/querying/query-context.html">&quot;maxQueuedBytes&quot; query context parameter</a>.</td><td><code>0</code> (disabled)</td></tr>
+<tr><td><code>druid.broker.http.maxQueuedBytes</code></td><td>Maximum number of bytes queued per query before exerting backpressure on the channel to the data server. Similar to <code>druid.server.http.maxScatterGatherBytes</code>, except unlike that configuration, this one will trigger backpressure rather than query failure. Zero means disabled. Can be overridden by the <a href="/docs/latest/querying/query-context.html">&quot;maxQueuedBytes&quot; query context parameter</a>. Human-readable format is supported, see <a href="/docs/latest/configuration/human-readable-byte.html">here</a>.</td><td><code>0</code> (disabled)</td></tr>
 <tr><td><code>druid.broker.http.numMaxThreads</code></td><td>`Maximum number of I/O worker threads</td><td>max(10, ((number of cores * 17) / 16 + 2) + 30)`</td></tr>
 </tbody>
 </table>
@@ -1759,7 +1781,7 @@
 <tr><th>Property</th><th>Description</th><th>Default</th></tr>
 </thead>
 <tbody>
-<tr><td><code>druid.processing.buffer.sizeBytes</code></td><td>This specifies a buffer size for the storage of intermediate results. The computation engine in both the Historical and Realtime processes will use a scratch buffer of this size to do all of their intermediate computations off-heap. Larger values allow for more aggregations in a single pass over the data while smaller values can require more passes depending on the query that is being executed.</td><td>auto (max 1GB)</td></tr>
+<tr><td><code>druid.processing.buffer.sizeBytes</code></td><td>This specifies a buffer size for the storage of intermediate results. The computation engine in both the Historical and Realtime processes will use a scratch buffer of this size to do all of their intermediate computations off-heap. Larger values allow for more aggregations in a single pass over the data while smaller values can require more passes depending on the query that is being executed. It can be configured as described in <a href="/docs/latest/configuration/human-readable-byte.html">here</a>.</td><td>auto (max 1GiB)</td></tr>
 <tr><td><code>druid.processing.buffer.poolCacheMaxCount</code></td><td>processing buffer pool caches the buffers for later use, this is the maximum count cache will grow to. note that pool can create more buffers than it can cache if necessary.</td><td>Integer.MAX_VALUE</td></tr>
 <tr><td><code>druid.processing.formatString</code></td><td>Realtime and Historical processes use this format string to name their processing threads.</td><td>processing-%s</td></tr>
 <tr><td><code>druid.processing.numMergeBuffers</code></td><td>The number of direct memory buffers available for merging query results. The buffers are sized by <code>druid.processing.buffer.sizeBytes</code>. This property is effectively a concurrency limit for queries that require merging buffers. If you are using any queries that require merge buffers (currently, just groupBy v2) then you should have at least two of these.</td><td><code>max(2, druid.processing.numThreads / 4)</code></td></tr>
@@ -1885,7 +1907,7 @@
 </thead>
 <tbody>
 <tr><td><code>druid.cache.type</code></td><td>Set this to <code>caffeine</code> or leave out parameter</td><td><code>caffeine</code></td></tr>
-<tr><td><code>druid.cache.sizeInBytes</code></td><td>The maximum size of the cache in bytes on heap.</td><td>min(1GB, Runtime.maxMemory / 10)</td></tr>
+<tr><td><code>druid.cache.sizeInBytes</code></td><td>The maximum size of the cache in bytes on heap. It can be configured as described in <a href="/docs/latest/configuration/human-readable-byte.html">here</a>.</td><td>min(1GiB, Runtime.maxMemory / 10)</td></tr>
 <tr><td><code>druid.cache.expireAfter</code></td><td>The time (in ms) after an access for which a cache entry may be expired</td><td>None (no time limit)</td></tr>
 <tr><td><code>druid.cache.cacheExecutorFactory</code></td><td>The executor factory to use for Caffeine maintenance. One of <code>COMMON_FJP</code>, <code>SINGLE_THREAD</code>, or <code>SAME_THREAD</code></td><td>ForkJoinPool common pool (<code>COMMON_FJP</code>)</td></tr>
 <tr><td><code>druid.cache.evictOnClose</code></td><td>If a close of a namespace (ex: removing a segment from a process) should cause an eager eviction of associated cache values</td><td><code>false</code></td></tr>
@@ -1947,17 +1969,29 @@
 </table>
 <h2><a class="anchor" aria-hidden="true" id="general-query-configuration"></a><a href="#general-query-configuration" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>General query configuration</h2>
 <p>This section describes configurations that control behavior of Druid's query types, applicable to Broker, Historical, and MiddleManager processes.</p>
-<h3><a class="anchor" aria-hidden="true" id="query-vectorization-config"></a><a href="#query-vectorization-config" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Query vectorization config</h3>
-<p>The following configurations are to set the default behavior for query vectorization.</p>
-<table>
-<thead>
-<tr><th>Property</th><th>Description</th><th>Default</th></tr>
-</thead>
-<tbody>
-<tr><td><code>druid.query.vectorize</code></td><td>See <a href="../querying/query-context.html#vectorization-parameters">Vectorization parameters</a> for details. This value can be overridden by <code>vectorize</code> in the query contexts.</td><td><code>true</code></td></tr>
-<tr><td><code>druid.query.vectorSize</code></td><td>See <a href="../querying/query-context.html#vectorization-parameters">Vectorization parameters</a> for details. This value can be overridden by <code>vectorSize</code> in the query contexts.</td><td><code>512</code></td></tr>
-</tbody>
-</table>
+<h3><a class="anchor" aria-hidden="true" id="overriding-default-query-context-values"></a><a href="#overriding-default-query-context-values" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Overriding default query context values</h3>
+<p>Any <a href="../querying/query-context.html#general-parameters">Query Context General Parameter</a> default value can be
+overridden by setting runtime property in the format of <code>druid.query.default.context.{query_context_key}</code>.
+<code>druid.query.default.context.{query_context_key}</code> runtime property prefix applies to all current and future
+query context keys, the same as how query context parameter passed with the query works. Note that the runtime property
+value can be overridden if value for the same key is explicitly specify in the query contexts.</p>
+<p>The precedence chain for query context values is as follows:</p>
+<p>hard-coded default value in Druid code &lt;- runtime property not prefixed with <code>druid.query.default.context</code>
+&lt;- runtime property prefixed with <code>druid.query.default.context</code> &lt;- context parameter in the query</p>
+<p>Note that not all query context key has a runtime property not prefixed with <code>druid.query.default.context</code> that can
+override the hard-coded default value. For example, <code>maxQueuedBytes</code> has <code>druid.broker.http.maxQueuedBytes</code>
+but <code>joinFilterRewriteMaxSize</code> does not. Hence, the only way of overriding <code>joinFilterRewriteMaxSize</code> hard-coded default
+value is with runtime property <code>druid.query.default.context.joinFilterRewriteMaxSize</code>.</p>
+<p>To further elaborate on the previous example:</p>
+<p>If neither <code>druid.broker.http.maxQueuedBytes</code> or <code>druid.query.default.context.maxQueuedBytes</code> is set and
+the query does not have <code>maxQueuedBytes</code> in the context, then the hard-coded value in Druid code is use.
+If runtime property only contains <code>druid.broker.http.maxQueuedBytes=x</code> and query does not have <code>maxQueuedBytes</code> in the
+context, then the value of the property, <code>x</code>, is use. However, if query does have <code>maxQueuedBytes</code> in the context,
+then that value is use instead.
+If runtime property only contains <code>druid.query.default.context.maxQueuedBytes=y</code> OR runtime property contains both
+<code>druid.broker.http.maxQueuedBytes=x</code> and <code>druid.query.default.context.maxQueuedBytes=y</code>, then the value of
+<code>druid.query.default.context.maxQueuedBytes</code>, <code>y</code>, is use (given that query does not have <code>maxQueuedBytes</code> in the
+context). If query does have <code>maxQueuedBytes</code> in the context, then that value is use instead.</p>
 <h3><a class="anchor" aria-hidden="true" id="topn-query-config"></a><a href="#topn-query-config" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>TopN query config</h3>
 <table>
 <thead>
@@ -2117,7 +2151,7 @@
 <tr><td><code>druid.router.http.requestBuffersize</code></td><td>Size of the content buffer for receiving requests. These buffers are only used for active connections that have requests with bodies that will not fit within the header buffer</td><td><code>8 * 1024</code></td></tr>
 </tbody>
 </table>
-</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/latest/development/geo.html"><span class="arrow-prev">← </span><span>Spatial filters</span></a><a class="docs-next button" href="/docs/latest/development/extensions.html"><span>Extensions</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#recommended-configuration-file-organization">Recommended Configuration File Organization</a></li><li><a href="#common-configurations">Common Configurations</a><ul class="toc-headings"><li><a href="#jvm-configuration-best-practices">JVM Configuration Best Practices</a></li><li><a href="#extensions">Extensions</a></li><li><a href="#modules">Modules</a></li><li><a href="#zookeeper">Zookeeper</a></li><li><a href="#exhibitor">Exhibitor</a></li><li><a href="#tls">TLS</a></li><li><a href="#authentication-and-authorization">Authentication and Authorization</a></li><li><a href="#startup-logging">Startup Logging</a></li><li><a href="#request-logging">Request Logging</a></li><li><a href="#enabling-metrics">Enabling Metrics</a></li><li><a href="#emitting-metrics">Emitting Metrics</a></li><li><a href="#metadata-storage">Metadata storage</a></li><li><a href="#deep-storage">Deep storage</a></li><li><a href="#task-logging">Task Logging</a></li><li><a href="#overlord-discovery">Overlord Discovery</a></li><li><a href="#coordinator-discovery">Coordinator Discovery</a></li><li><a href="#announcing-segments">Announcing Segments</a></li><li><a href="#javascript">JavaScript</a></li><li><a href="#double-column-storage">Double Column storage</a></li><li><a href="#sql-compatible-null-handling">SQL compatible null handling</a></li><li><a href="#http-client">HTTP Client</a></li></ul></li><li><a href="#master-server">Master Server</a><ul class="toc-headings"><li><a href="#coordinator">Coordinator</a></li><li><a href="#overlord">Overlord</a></li></ul></li><li><a href="#data-server">Data Server</a><ul class="toc-headings"><li><a href="#middlemanager-and-peons">MiddleManager and Peons</a></li><li><a href="#indexer">Indexer</a></li><li><a href="#historical">Historical</a></li></ul></li><li><a href="#query-server">Query Server</a><ul class="toc-headings"><li><a href="#broker">Broker</a></li></ul></li><li><a href="#cache-configuration">Cache Configuration</a><ul class="toc-headings"><li><a href="#cache-type">Cache Type</a></li></ul></li><li><a href="#general-query-configuration">General query configuration</a><ul class="toc-headings"><li><a href="#query-vectorization-config">Query vectorization config</a></li><li><a href="#topn-query-config">TopN query config</a></li><li><a href="#search-query-config">Search query config</a></li><li><a href="#segmentmetadata-query-config">SegmentMetadata query config</a></li><li><a href="#groupby-query-config">GroupBy query config</a></li><li><a href="#advanced-configurations">Advanced configurations</a></li><li><a href="#router">Router</a></li></ul></li></ul></nav></div><footer class="nav-footer druid-footer" id="footer"><div class="container"><div class="text-center"><p><a href="/technology">Technology</a> · <a href="/use-cases">Use Cases</a> · <a href="/druid-powered">Powered by Druid</a> · <a href="/docs/latest/latest">Docs</a> · <a href="/community/">Community</a> · <a href="/downloads.html">Download</a> · <a href="/faq">FAQ</a></p></div><div class="text-center"><a title="Join the user group" href="https://groups.google.com/forum/#!forum/druid-user" target="_blank"><span class="fa fa-comments"></span></a> · <a title="Follow Druid" href="https://twitter.com/druidio" target="_blank"><span class="fab fa-twitter"></span></a> · <a title="Download via Apache" href="https://www.apache.org/dyn/closer.cgi?path=/incubator/druid/{{ site.druid_versions[0].versions[0].version }}/apache-druid-{{ site.druid_versions[0].versions[0].version }}-bin.tar.gz" target="_blank"><span class="fas fa-feather"></span></a> · <a title="GitHub" href="https://github.com/apache/druid" target="_blank"><span class="fab fa-github"></span></a></div><div class="text-center license">Copyright © 2019 <a href="https://www.apache.org/" target="_blank">Apache Software Foundation</a>.<br/>Except where otherwise noted, licensed under <a rel="license" href="http://creativecommons.org/licenses/by-sa/4.0/">CC BY-SA 4.0</a>.<br/>Apache Druid, Druid, and the Druid logo are either registered trademarks or trademarks of The Apache Software Foundation in the United States and other countries.</div></div></footer></div><script type="text/javascript" src="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.js"></script><script>
+</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/latest/development/geo.html"><span class="arrow-prev">← </span><span>Spatial filters</span></a><a class="docs-next button" href="/docs/latest/development/extensions.html"><span>Extensions</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#recommended-configuration-file-organization">Recommended Configuration File Organization</a></li><li><a href="#common-configurations">Common Configurations</a><ul class="toc-headings"><li><a href="#jvm-configuration-best-practices">JVM Configuration Best Practices</a></li><li><a href="#extensions">Extensions</a></li><li><a href="#modules">Modules</a></li><li><a href="#zookeeper">Zookeeper</a></li><li><a href="#exhibitor">Exhibitor</a></li><li><a href="#tls">TLS</a></li><li><a href="#authentication-and-authorization">Authentication and Authorization</a></li><li><a href="#startup-logging">Startup Logging</a></li><li><a href="#request-logging">Request Logging</a></li><li><a href="#audit-logging">Audit Logging</a></li><li><a href="#enabling-metrics">Enabling Metrics</a></li><li><a href="#emitting-metrics">Emitting Metrics</a></li><li><a href="#metadata-storage">Metadata storage</a></li><li><a href="#deep-storage">Deep storage</a></li><li><a href="#task-logging">Task Logging</a></li><li><a href="#overlord-discovery">Overlord Discovery</a></li><li><a href="#coordinator-discovery">Coordinator Discovery</a></li><li><a href="#announcing-segments">Announcing Segments</a></li><li><a href="#javascript">JavaScript</a></li><li><a href="#double-column-storage">Double Column storage</a></li><li><a href="#sql-compatible-null-handling">SQL compatible null handling</a></li><li><a href="#http-client">HTTP Client</a></li></ul></li><li><a href="#master-server">Master Server</a><ul class="toc-headings"><li><a href="#coordinator">Coordinator</a></li><li><a href="#overlord">Overlord</a></li></ul></li><li><a href="#data-server">Data Server</a><ul class="toc-headings"><li><a href="#middlemanager-and-peons">MiddleManager and Peons</a></li><li><a href="#indexer">Indexer</a></li><li><a href="#historical">Historical</a></li></ul></li><li><a href="#query-server">Query Server</a><ul class="toc-headings"><li><a href="#broker">Broker</a></li></ul></li><li><a href="#cache-configuration">Cache Configuration</a><ul class="toc-headings"><li><a href="#cache-type">Cache Type</a></li></ul></li><li><a href="#general-query-configuration">General query configuration</a><ul class="toc-headings"><li><a href="#overriding-default-query-context-values">Overriding default query context values</a></li><li><a href="#topn-query-config">TopN query config</a></li><li><a href="#search-query-config">Search query config</a></li><li><a href="#segmentmetadata-query-config">SegmentMetadata query config</a></li><li><a href="#groupby-query-config">GroupBy query config</a></li><li><a href="#advanced-configurations">Advanced configurations</a></li><li><a href="#router">Router</a></li></ul></li></ul></nav></div><footer class="nav-footer druid-footer" id="footer"><div class="container"><div class="text-center"><p><a href="/technology">Technology</a> · <a href="/use-cases">Use Cases</a> · <a href="/druid-powered">Powered by Druid</a> · <a href="/docs/latest/latest">Docs</a> · <a href="/community/">Community</a> · <a href="/downloads.html">Download</a> · <a href="/faq">FAQ</a></p></div><div class="text-center"><a title="Join the user group" href="https://groups.google.com/forum/#!forum/druid-user" target="_blank"><span class="fa fa-comments"></span></a> · <a title="Follow Druid" href="https://twitter.com/druidio" target="_blank"><span class="fab fa-twitter"></span></a> · <a title="Download via Apache" href="https://www.apache.org/dyn/closer.cgi?path=/incubator/druid/{{ site.druid_versions[0].versions[0].version }}/apache-druid-{{ site.druid_versions[0].versions[0].version }}-bin.tar.gz" target="_blank"><span class="fas fa-feather"></span></a> · <a title="GitHub" href="https://github.com/apache/druid" target="_blank"><span class="fab fa-github"></span></a></div><div class="text-center license">Copyright © 2019 <a href="https://www.apache.org/" target="_blank">Apache Software Foundation</a>.<br/>Except where otherwise noted, licensed under <a rel="license" href="http://creativecommons.org/licenses/by-sa/4.0/">CC BY-SA 4.0</a>.<br/>Apache Druid, Druid, and the Druid logo are either registered trademarks or trademarks of The Apache Software Foundation in the United States and other countries.</div></div></footer></div><script type="text/javascript" src="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.js"></script><script>
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             </script></body></html>
\ No newline at end of file
diff --git a/docs/latest/configuration/logging.html b/docs/latest/configuration/logging.html
index 8127b69..9a1f141 100644
--- a/docs/latest/configuration/logging.html
+++ b/docs/latest/configuration/logging.html
@@ -1,4 +1,4 @@
-<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Logging · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/configuration/logging.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.19.0" /><meta property="og:title" content="Logging · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Logging · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/configuration/logging.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.20.0" /><meta property="og:title" content="Logging · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
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+                algoliaOptions: {"facetFilters":["language:en","version:0.20.0"]}
               });
             </script></body></html>
\ No newline at end of file
diff --git a/docs/latest/dependencies/deep-storage.html b/docs/latest/dependencies/deep-storage.html
index f988c38..a0d77ad 100644
--- a/docs/latest/dependencies/deep-storage.html
+++ b/docs/latest/dependencies/deep-storage.html
@@ -1,4 +1,4 @@
-<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Deep storage · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/dependencies/deep-storage.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.19.0" /><meta property="og:title" content="Deep storage · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Deep storage · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/dependencies/deep-storage.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.20.0" /><meta property="og:title" content="Deep storage · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
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+                algoliaOptions: {"facetFilters":["language:en","version:0.20.0"]}
               });
             </script></body></html>
\ No newline at end of file
diff --git a/docs/latest/dependencies/metadata-storage.html b/docs/latest/dependencies/metadata-storage.html
index a47be37..09c7a7c 100644
--- a/docs/latest/dependencies/metadata-storage.html
+++ b/docs/latest/dependencies/metadata-storage.html
@@ -1,4 +1,4 @@
-<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Metadata storage · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/dependencies/metadata-storage.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.19.0" /><meta property="og:title" content="Metadata storage · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Metadata storage · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/dependencies/metadata-storage.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.20.0" /><meta property="og:title" content="Metadata storage · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
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             </script></body></html>
\ No newline at end of file
diff --git a/docs/latest/dependencies/zookeeper.html b/docs/latest/dependencies/zookeeper.html
index 503a444..fe2e14a 100644
--- a/docs/latest/dependencies/zookeeper.html
+++ b/docs/latest/dependencies/zookeeper.html
@@ -1,4 +1,4 @@
-<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>ZooKeeper · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/dependencies/zookeeper.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.19.0" /><meta property="og:title" content="ZooKeeper · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>ZooKeeper · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/dependencies/zookeeper.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.20.0" /><meta property="og:title" content="ZooKeeper · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
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               function gtag(){dataLayer.push(arguments); }
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@@ -124,6 +124,6 @@
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             </script></body></html>
\ No newline at end of file
diff --git a/docs/latest/design/architecture.html b/docs/latest/design/architecture.html
index b6d0c0b..a00a67b 100644
--- a/docs/latest/design/architecture.html
+++ b/docs/latest/design/architecture.html
@@ -1,4 +1,4 @@
-<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Design · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/design/architecture.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.19.0" /><meta property="og:title" content="Design · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Design · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/design/architecture.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.20.0" /><meta property="og:title" content="Design · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
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@@ -231,6 +231,67 @@
 published segments. Generally this is a transient state, and segments in this state will soon have their <code>used</code> flag
 automatically set to false.</li>
 </ul>
+<h3><a class="anchor" aria-hidden="true" id="availability-and-consistency"></a><a href="#availability-and-consistency" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Availability and consistency</h3>
+<p>Druid has an architectural separation between ingestion and querying, as described above in
+<a href="#indexing-and-handoff">Indexing and handoff</a>. This means that when understanding Druid's availability and
+consistency properties, we must look at each function separately.</p>
+<p>On the <strong>ingestion side</strong>, Druid's primary <a href="/docs/latest/ingestion/index.html#ingestion-methods">ingestion methods</a> are all
+pull-based and offer transactional guarantees. This means that you are guaranteed that ingestion using these will
+publish in an all-or-nothing manner:</p>
+<ul>
+<li>Supervised &quot;seekable-stream&quot; ingestion methods like <a href="/docs/latest/development/extensions-core/kafka-ingestion.html">Kafka</a> and
+<a href="/docs/latest/development/extensions-core/kinesis-ingestion.html">Kinesis</a>. With these methods, Druid commits stream offsets to its
+<a href="#metadata-storage">metadata store</a> alongside segment metadata, in the same transaction. Note that ingestion of data
+that has not yet been published can be rolled back if ingestion tasks fail. In this case, partially-ingested data is
+discarded, and Druid will resume ingestion from the last committed set of stream offsets. This ensures exactly-once
+publishing behavior.</li>
+<li><a href="../ingestion/hadoop.html">Hadoop-based batch ingestion</a>. Each task publishes all segment metadata in a single
+transaction.</li>
+<li><a href="../ingestion/native-batch.html">Native batch ingestion</a>. In parallel mode, the supervisor task publishes all segment
+metadata in a single transaction after the subtasks are finished. In simple (single-task) mode, the single task
+publishes all segment metadata in a single transaction after it is complete.</li>
+</ul>
+<p><a href="/docs/latest/ingestion/tranquility.html">Tranquility</a>, a streaming ingestion method that is no longer recommended, does not perform
+transactional loading.</p>
+<p>Additionally, some ingestion methods offer an <em>idempotency</em> guarantee. This means that repeated executions of the same
+ingestion will not cause duplicate data to be ingested:</p>
+<ul>
+<li>Supervised &quot;seekable-stream&quot; ingestion methods like <a href="/docs/latest/development/extensions-core/kafka-ingestion.html">Kafka</a> and
+<a href="/docs/latest/development/extensions-core/kinesis-ingestion.html">Kinesis</a> are idempotent due to the fact that stream offsets and
+segment metadata are stored together and updated in lock-step.</li>
+<li><a href="../ingestion/hadoop.html">Hadoop-based batch ingestion</a> is idempotent unless one of your input sources
+is the same Druid datasource that you are ingesting into. In this case, running the same task twice is non-idempotent,
+because you are adding to existing data instead of overwriting it.</li>
+<li><a href="../ingestion/native-batch.html">Native batch ingestion</a> is idempotent unless
+<a href="../ingestion/native-batch.html"><code>appendToExisting</code></a> is true, or one of your input sources is the same Druid datasource
+that you are ingesting into. In either of these two cases, running the same task twice is non-idempotent, because you
+are adding to existing data instead of overwriting it.</li>
+</ul>
+<p>On the <strong>query side</strong>, the Druid Broker is responsible for ensuring that a consistent set of segments is involved in a
+given query. It selects the appropriate set of segments to use when the query starts based on what is currently
+available. This is supported by <em>atomic replacement</em>, a feature that ensures that from a user's perspective, queries
+flip instantaneously from an older set of data to a newer set of data, with no consistency or performance impact.
+This is used for Hadoop-based batch ingestion, native batch ingestion when <code>appendToExisting</code> is false, and compaction.</p>
+<p>Note that atomic replacement happens for each time chunk individually. If a batch ingestion task or compaction
+involves multiple time chunks, then each time chunk will undergo atomic replacement soon after the task finishes, but
+the replacements will not all happen simultaneously.</p>
+<p>Typically, atomic replacement in Druid is based on a <em>core set</em> concept that works in conjunction with segment versions.
+When a time chunk is overwritten, a new core set of segments is created with a higher version number. The core set
+must <em>all</em> be available before the Broker will use them instead of the older set. There can also only be one core set
+per version per time chunk. Druid will also only use a single version at a time per time chunk. Together, these
+properties provide Druid's atomic replacement guarantees.</p>
+<p>Druid also supports an experimental <em>segment locking</em> mode that is activated by setting
+<a href="/docs/latest/ingestion/tasks.html#context"><code>forceTimeChunkLock</code></a> to false in the context of an ingestion task. In this case, Druid
+creates an <em>atomic update group</em> using the existing version for the time chunk, instead of creating a new core set
+with a new version number. There can be multiple atomic update groups with the same version number per time chunk. Each
+one replaces a specific set of earlier segments in the same time chunk and with the same version number. Druid will
+query the latest one that is fully available. This is a more powerful version of the core set concept, because it
+enables atomically replacing a subset of data for a time chunk, as well as doing atomic replacement and appending
+simultaneously.</p>
+<p>If segments become unavailable due to multiple Historicals going offline simultaneously (beyond your replication
+factor), then Druid queries will include only the segments that are still available. In the background, Druid will
+reload these unavailable segments on other Historicals as quickly as possible, at which point they will be included in
+queries again.</p>
 <h2><a class="anchor" aria-hidden="true" id="query-processing"></a><a href="#query-processing" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Query processing</h2>
 <p>Queries first enter the <a href="/docs/latest/design/broker.html">Broker</a>, where the Broker will identify which segments have data that may pertain to that query.
 The list of segments is always pruned by time, and may also be pruned by other attributes depending on how your
@@ -251,7 +312,7 @@
 </ul>
 <p>For more details about how Druid executes queries, refer to the <a href="/docs/latest/querying/query-execution.html">Query execution</a>
 documentation.</p>
-</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/latest/tutorials/tutorial-kerberos-hadoop.html"><span class="arrow-prev">← </span><span>Kerberized HDFS deep storage</span></a><a class="docs-next button" href="/docs/latest/design/segments.html"><span>Segments</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#processes-and-servers">Processes and Servers</a></li><li><a href="#external-dependencies">External dependencies</a><ul class="toc-headings"><li><a href="#deep-storage">Deep storage</a></li><li><a href="#metadata-storage">Metadata storage</a></li><li><a href="#zookeeper">ZooKeeper</a></li></ul></li><li><a href="#architecture-diagram">Architecture diagram</a></li><li><a href="#storage-design">Storage design</a><ul class="toc-headings"><li><a href="#datasources-and-segments">Datasources and segments</a></li><li><a href="#indexing-and-handoff">Indexing and handoff</a></li><li><a href="#segment-identifiers">Segment identifiers</a></li><li><a href="#segment-versioning">Segment versioning</a></li><li><a href="#segment-lifecycle">Segment lifecycle</a></li></ul></li><li><a href="#query-processing">Query processing</a></li></ul></nav></div><footer class="nav-footer druid-footer" id="footer"><div class="container"><div class="text-center"><p><a href="/technology">Technology</a> · <a href="/use-cases">Use Cases</a> · <a href="/druid-powered">Powered by Druid</a> · <a href="/docs/latest/latest">Docs</a> · <a href="/community/">Community</a> · <a href="/downloads.html">Download</a> · <a href="/faq">FAQ</a></p></div><div class="text-center"><a title="Join the user group" href="https://groups.google.com/forum/#!forum/druid-user" target="_blank"><span class="fa fa-comments"></span></a> · <a title="Follow Druid" href="https://twitter.com/druidio" target="_blank"><span class="fab fa-twitter"></span></a> · <a title="Download via Apache" href="https://www.apache.org/dyn/closer.cgi?path=/incubator/druid/{{ site.druid_versions[0].versions[0].version }}/apache-druid-{{ site.druid_versions[0].versions[0].version }}-bin.tar.gz" target="_blank"><span class="fas fa-feather"></span></a> · <a title="GitHub" href="https://github.com/apache/druid" target="_blank"><span class="fab fa-github"></span></a></div><div class="text-center license">Copyright © 2019 <a href="https://www.apache.org/" target="_blank">Apache Software Foundation</a>.<br/>Except where otherwise noted, licensed under <a rel="license" href="http://creativecommons.org/licenses/by-sa/4.0/">CC BY-SA 4.0</a>.<br/>Apache Druid, Druid, and the Druid logo are either registered trademarks or trademarks of The Apache Software Foundation in the United States and other countries.</div></div></footer></div><script type="text/javascript" src="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.js"></script><script>
+</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/latest/tutorials/tutorial-kerberos-hadoop.html"><span class="arrow-prev">← </span><span>Kerberized HDFS deep storage</span></a><a class="docs-next button" href="/docs/latest/design/segments.html"><span>Segments</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#processes-and-servers">Processes and Servers</a></li><li><a href="#external-dependencies">External dependencies</a><ul class="toc-headings"><li><a href="#deep-storage">Deep storage</a></li><li><a href="#metadata-storage">Metadata storage</a></li><li><a href="#zookeeper">ZooKeeper</a></li></ul></li><li><a href="#architecture-diagram">Architecture diagram</a></li><li><a href="#storage-design">Storage design</a><ul class="toc-headings"><li><a href="#datasources-and-segments">Datasources and segments</a></li><li><a href="#indexing-and-handoff">Indexing and handoff</a></li><li><a href="#segment-identifiers">Segment identifiers</a></li><li><a href="#segment-versioning">Segment versioning</a></li><li><a href="#segment-lifecycle">Segment lifecycle</a></li><li><a href="#availability-and-consistency">Availability and consistency</a></li></ul></li><li><a href="#query-processing">Query processing</a></li></ul></nav></div><footer class="nav-footer druid-footer" id="footer"><div class="container"><div class="text-center"><p><a href="/technology">Technology</a> · <a href="/use-cases">Use Cases</a> · <a href="/druid-powered">Powered by Druid</a> · <a href="/docs/latest/latest">Docs</a> · <a href="/community/">Community</a> · <a href="/downloads.html">Download</a> · <a href="/faq">FAQ</a></p></div><div class="text-center"><a title="Join the user group" href="https://groups.google.com/forum/#!forum/druid-user" target="_blank"><span class="fa fa-comments"></span></a> · <a title="Follow Druid" href="https://twitter.com/druidio" target="_blank"><span class="fab fa-twitter"></span></a> · <a title="Download via Apache" href="https://www.apache.org/dyn/closer.cgi?path=/incubator/druid/{{ site.druid_versions[0].versions[0].version }}/apache-druid-{{ site.druid_versions[0].versions[0].version }}-bin.tar.gz" target="_blank"><span class="fas fa-feather"></span></a> · <a title="GitHub" href="https://github.com/apache/druid" target="_blank"><span class="fab fa-github"></span></a></div><div class="text-center license">Copyright © 2019 <a href="https://www.apache.org/" target="_blank">Apache Software Foundation</a>.<br/>Except where otherwise noted, licensed under <a rel="license" href="http://creativecommons.org/licenses/by-sa/4.0/">CC BY-SA 4.0</a>.<br/>Apache Druid, Druid, and the Druid logo are either registered trademarks or trademarks of The Apache Software Foundation in the United States and other countries.</div></div></footer></div><script type="text/javascript" src="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.js"></script><script>
                 document.addEventListener('keyup', function(e) {
                   if (e.target !== document.body) {
                     return;
@@ -268,6 +329,6 @@
                 apiKey: '2de99082a9f38e49dfaa059bbe4c901d',
                 indexName: 'apache_druid',
                 inputSelector: '#search_input_react',
-                algoliaOptions: {"facetFilters":["language:en","version:0.19.0"]}
+                algoliaOptions: {"facetFilters":["language:en","version:0.20.0"]}
               });
             </script></body></html>
\ No newline at end of file
diff --git a/docs/latest/design/auth.html b/docs/latest/design/auth.html
index 0196468..e9a3bc1 100644
--- a/docs/latest/design/auth.html
+++ b/docs/latest/design/auth.html
@@ -1,4 +1,4 @@
-<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Authentication and Authorization · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/design/auth.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.19.0" /><meta property="og:title" content="Authentication and Authorization · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
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diff --git a/docs/latest/design/broker.html b/docs/latest/design/broker.html
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+++ b/docs/latest/design/broker.html
@@ -1,4 +1,4 @@
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+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Broker · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/design/broker.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.20.0" /><meta property="og:title" content="Broker · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
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diff --git a/docs/latest/design/coordinator.html b/docs/latest/design/coordinator.html
index 4f29cd7..a722f5e 100644
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+++ b/docs/latest/design/coordinator.html
@@ -1,4 +1,4 @@
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+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Coordinator Process · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/design/coordinator.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.20.0" /><meta property="og:title" content="Coordinator Process · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
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diff --git a/docs/latest/design/extensions-contrib/dropwizard.html b/docs/latest/design/extensions-contrib/dropwizard.html
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+++ b/docs/latest/design/extensions-contrib/dropwizard.html
@@ -1,4 +1,4 @@
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+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Dropwizard metrics emitter · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/design/extensions-contrib/dropwizard.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.20.0" /><meta property="og:title" content="Dropwizard metrics emitter · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
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\ No newline at end of file
diff --git a/docs/latest/design/historical.html b/docs/latest/design/historical.html
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+++ b/docs/latest/design/historical.html
@@ -1,4 +1,4 @@
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+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Historical Process · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/design/historical.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.20.0" /><meta property="og:title" content="Historical Process · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
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diff --git a/docs/latest/design/index.html b/docs/latest/design/index.html
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@@ -1,4 +1,4 @@
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+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Introduction to Apache Druid · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/design/index.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.20.0" /><meta property="og:title" content="Introduction to Apache Druid · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
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diff --git a/docs/latest/design/indexer.html b/docs/latest/design/indexer.html
index 70de6b4..65cc08c 100644
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+++ b/docs/latest/design/indexer.html
@@ -1,4 +1,4 @@
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+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Indexer Process · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/design/indexer.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.20.0" /><meta property="og:title" content="Indexer Process · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
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diff --git a/docs/latest/design/indexing-service.html b/docs/latest/design/indexing-service.html
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@@ -1,4 +1,4 @@
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+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Indexing Service · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/design/indexing-service.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.20.0" /><meta property="og:title" content="Indexing Service · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
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\ No newline at end of file
diff --git a/docs/latest/design/middlemanager.html b/docs/latest/design/middlemanager.html
index be0146d..ce8ce59 100644
--- a/docs/latest/design/middlemanager.html
+++ b/docs/latest/design/middlemanager.html
@@ -1,4 +1,4 @@
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+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>MiddleManager Process · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/design/middlemanager.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.20.0" /><meta property="og:title" content="MiddleManager Process · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
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\ No newline at end of file
diff --git a/docs/latest/design/overlord.html b/docs/latest/design/overlord.html
index c486462..d5456b1 100644
--- a/docs/latest/design/overlord.html
+++ b/docs/latest/design/overlord.html
@@ -1,4 +1,4 @@
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+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Overlord Process · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/design/overlord.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.20.0" /><meta property="og:title" content="Overlord Process · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
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\ No newline at end of file
diff --git a/docs/latest/design/peons.html b/docs/latest/design/peons.html
index 8167c59..5fc87cb 100644
--- a/docs/latest/design/peons.html
+++ b/docs/latest/design/peons.html
@@ -1,4 +1,4 @@
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+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Peons · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/design/peons.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.20.0" /><meta property="og:title" content="Peons · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
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\ No newline at end of file
diff --git a/docs/latest/design/processes.html b/docs/latest/design/processes.html
index 91416bc..f465491 100644
--- a/docs/latest/design/processes.html
+++ b/docs/latest/design/processes.html
@@ -1,4 +1,4 @@
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+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Processes and servers · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/design/processes.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.20.0" /><meta property="og:title" content="Processes and servers · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
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\ No newline at end of file
diff --git a/docs/latest/design/router.html b/docs/latest/design/router.html
index 392e38b..3592a9f 100644
--- a/docs/latest/design/router.html
+++ b/docs/latest/design/router.html
@@ -1,4 +1,4 @@
-<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Router Process · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/design/router.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.19.0" /><meta property="og:title" content="Router Process · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Router Process · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/design/router.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.20.0" /><meta property="og:title" content="Router Process · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
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\ No newline at end of file
diff --git a/docs/latest/design/segments.html b/docs/latest/design/segments.html
index d20c37c..7976f39 100644
--- a/docs/latest/design/segments.html
+++ b/docs/latest/design/segments.html
@@ -1,4 +1,4 @@
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+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Segments · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/design/segments.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.20.0" /><meta property="og:title" content="Segments · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
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\ No newline at end of file
diff --git a/docs/latest/development/build.html b/docs/latest/development/build.html
index 1ffd2ec..11e70fc 100644
--- a/docs/latest/development/build.html
+++ b/docs/latest/development/build.html
@@ -1,4 +1,4 @@
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+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Build from source · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/development/build.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.20.0" /><meta property="og:title" content="Build from source · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
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diff --git a/docs/latest/development/experimental.html b/docs/latest/development/experimental.html
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+++ b/docs/latest/development/experimental.html
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+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Experimental features · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/development/experimental.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.20.0" /><meta property="og:title" content="Experimental features · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
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diff --git a/docs/latest/development/extensions-contrib/aliyun-oss.html b/docs/latest/development/extensions-contrib/aliyun-oss.html
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+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Aliyun OSS · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/development/extensions-contrib/aliyun-oss.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.20.0" /><meta property="og:title" content="Aliyun OSS · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
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diff --git a/docs/latest/development/extensions-contrib/ambari-metrics-emitter.html b/docs/latest/development/extensions-contrib/ambari-metrics-emitter.html
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+++ b/docs/latest/development/extensions-contrib/ambari-metrics-emitter.html
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+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Ambari Metrics Emitter · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/development/extensions-contrib/ambari-metrics-emitter.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.20.0" /><meta property="og:title" content="Ambari Metrics Emitter · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
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\ No newline at end of file
diff --git a/docs/latest/development/extensions-contrib/cassandra.html b/docs/latest/development/extensions-contrib/cassandra.html
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@@ -1,4 +1,4 @@
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+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Apache Cassandra · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/development/extensions-contrib/cassandra.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.20.0" /><meta property="og:title" content="Apache Cassandra · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
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\ No newline at end of file
diff --git a/docs/latest/development/extensions-contrib/cloudfiles.html b/docs/latest/development/extensions-contrib/cloudfiles.html
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+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Rackspace Cloud Files · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/development/extensions-contrib/cloudfiles.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.20.0" /><meta property="og:title" content="Rackspace Cloud Files · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
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\ No newline at end of file
diff --git a/docs/latest/development/extensions-contrib/distinctcount.html b/docs/latest/development/extensions-contrib/distinctcount.html
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+++ b/docs/latest/development/extensions-contrib/distinctcount.html
@@ -1,4 +1,4 @@
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+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>DistinctCount Aggregator · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/development/extensions-contrib/distinctcount.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.20.0" /><meta property="og:title" content="DistinctCount Aggregator · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
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diff --git a/docs/latest/development/extensions-contrib/gce-extensions.html b/docs/latest/development/extensions-contrib/gce-extensions.html
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+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>GCE Extensions · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/development/extensions-contrib/gce-extensions.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.20.0" /><meta property="og:title" content="GCE Extensions · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
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diff --git a/docs/latest/development/extensions-contrib/graphite.html b/docs/latest/development/extensions-contrib/graphite.html
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+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Graphite Emitter · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/development/extensions-contrib/graphite.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.20.0" /><meta property="og:title" content="Graphite Emitter · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
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diff --git a/docs/latest/development/extensions-contrib/influx.html b/docs/latest/development/extensions-contrib/influx.html
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+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>InfluxDB Line Protocol Parser · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/development/extensions-contrib/influx.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.20.0" /><meta property="og:title" content="InfluxDB Line Protocol Parser · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
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diff --git a/docs/latest/development/extensions-contrib/influxdb-emitter.html b/docs/latest/development/extensions-contrib/influxdb-emitter.html
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+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>InfluxDB Emitter · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/development/extensions-contrib/influxdb-emitter.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.20.0" /><meta property="og:title" content="InfluxDB Emitter · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
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diff --git a/docs/latest/development/extensions-contrib/kafka-emitter.html b/docs/latest/development/extensions-contrib/kafka-emitter.html
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+++ b/docs/latest/development/extensions-contrib/kafka-emitter.html
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+++ b/docs/latest/development/extensions-contrib/materialized-view.html
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+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Materialized View · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/development/extensions-contrib/materialized-view.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.20.0" /><meta property="og:title" content="Materialized View · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
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\ No newline at end of file
diff --git a/docs/latest/development/extensions-contrib/momentsketch-quantiles.html b/docs/latest/development/extensions-contrib/momentsketch-quantiles.html
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+++ b/docs/latest/development/extensions-contrib/momentsketch-quantiles.html
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+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Moment Sketches for Approximate Quantiles module · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/development/extensions-contrib/momentsketch-quantiles.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.20.0" /><meta property="og:title" content="Moment Sketches for Approximate Quantiles module · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
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diff --git a/docs/latest/development/extensions-contrib/moving-average-query.html b/docs/latest/development/extensions-contrib/moving-average-query.html
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+++ b/docs/latest/development/extensions-contrib/moving-average-query.html
@@ -1,4 +1,4 @@
-<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Moving Average Query · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/development/extensions-contrib/moving-average-query.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.19.0" /><meta property="og:title" content="Moving Average Query · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Moving Average Query · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/development/extensions-contrib/moving-average-query.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.20.0" /><meta property="og:title" content="Moving Average Query · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
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               function gtag(){dataLayer.push(arguments); }
               gtag('js', new Date());
@@ -386,6 +386,6 @@
                 apiKey: '2de99082a9f38e49dfaa059bbe4c901d',
                 indexName: 'apache_druid',
                 inputSelector: '#search_input_react',
-                algoliaOptions: {"facetFilters":["language:en","version:0.19.0"]}
+                algoliaOptions: {"facetFilters":["language:en","version:0.20.0"]}
               });
             </script></body></html>
\ No newline at end of file
diff --git a/docs/latest/development/extensions-contrib/opentsdb-emitter.html b/docs/latest/development/extensions-contrib/opentsdb-emitter.html
index f8f87b2..34a82f7 100644
--- a/docs/latest/development/extensions-contrib/opentsdb-emitter.html
+++ b/docs/latest/development/extensions-contrib/opentsdb-emitter.html
@@ -1,4 +1,4 @@
-<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>OpenTSDB Emitter · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/development/extensions-contrib/opentsdb-emitter.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.19.0" /><meta property="og:title" content="OpenTSDB Emitter · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>OpenTSDB Emitter · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/development/extensions-contrib/opentsdb-emitter.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.20.0" /><meta property="og:title" content="OpenTSDB Emitter · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
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               function gtag(){dataLayer.push(arguments); }
               gtag('js', new Date());
@@ -126,6 +126,6 @@
                 apiKey: '2de99082a9f38e49dfaa059bbe4c901d',
                 indexName: 'apache_druid',
                 inputSelector: '#search_input_react',
-                algoliaOptions: {"facetFilters":["language:en","version:0.19.0"]}
+                algoliaOptions: {"facetFilters":["language:en","version:0.20.0"]}
               });
             </script></body></html>
\ No newline at end of file
diff --git a/docs/latest/development/extensions-contrib/redis-cache.html b/docs/latest/development/extensions-contrib/redis-cache.html
index 95c326f..79201fb 100644
--- a/docs/latest/development/extensions-contrib/redis-cache.html
+++ b/docs/latest/development/extensions-contrib/redis-cache.html
@@ -1,4 +1,4 @@
-<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Druid Redis Cache · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/development/extensions-contrib/redis-cache.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.19.0" /><meta property="og:title" content="Druid Redis Cache · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Druid Redis Cache · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/development/extensions-contrib/redis-cache.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.20.0" /><meta property="og:title" content="Druid Redis Cache · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
               window.dataLayer = window.dataLayer || [];
               function gtag(){dataLayer.push(arguments); }
               gtag('js', new Date());
@@ -77,28 +77,76 @@
   ~ specific language governing permissions and limitations
   ~ under the License.
   -->
-<p>To use this Apache Druid extension, make sure to <a href="/docs/latest/development/extensions.html#loading-extensions">include</a> <code>druid-redis-cache</code> extension.</p>
-<p>A cache implementation for Druid based on <a href="https://github.com/antirez/redis">Redis</a>.</p>
-<p>Below are the configuration options known to this module.</p>
-<p>Note that just adding these properties does not enable the cache. You still need to add the <code>druid.&lt;process-type&gt;.cache.useCache</code> and <code>druid.&lt;process-type&gt;.cache.populateCache</code> properties for the processes you want to enable the cache on as described in the <a href="../../configuration/index.html#cache-configuration">cache configuration docs</a>.</p>
-<p>A possible configuration would be to keep the properties below in your <code>common.runtime.properties</code> file (present on all processes) and then add <code>druid.&lt;nodetype&gt;.cache.useCache</code> and <code>druid.&lt;nodetype&gt;.cache.populateCache</code> in the <code>runtime.properties</code> file of the process types you want to enable caching on.</p>
+<p>A cache implementation for Druid based on <a href="https://github.com/redis/redis">Redis</a>.</p>
+<p>Below are guidance and configuration options known to this module.</p>
+<h2><a class="anchor" aria-hidden="true" id="installation"></a><a href="#installation" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Installation</h2>
+<p>Use <a href="/docs/latest/operations/pull-deps.html">pull-deps</a> tool shipped with Druid to install this <a href="/docs/latest/development/extensions.html#community-extensions">extension</a> on broker, historical and middle manager nodes.</p>
+<pre><code class="hljs css language-bash">java -classpath <span class="hljs-string">"druid_dir/lib/*"</span> org.apache.druid.cli.Main tools pull-deps -c org.apache.druid.extensions.contrib:druid-redis-cache:{VERSION}
+</code></pre>
+<h2><a class="anchor" aria-hidden="true" id="enabling"></a><a href="#enabling" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Enabling</h2>
+<p>To enable this extension after installation,</p>
+<ol>
+<li><a href="/docs/latest/development/extensions.html#loading-extensions">include</a> this <code>druid-redis-cache</code> extension</li>
+<li>to enable cache on broker nodes, follow <a href="../../configuration/index.html#broker-caching">broker caching docs</a> to set related properties</li>
+<li>to enable cache on historical nodes, follow <a href="../../configuration/index.html#historical-caching">historical caching docs</a> to set related properties</li>
+<li>to enable cache on middle manager nodes, follow <a href="../../configuration/index.html#peon-caching">peon caching docs</a> to set related properties</li>
+<li>set <code>druid.cache.type</code> to <code>redis</code></li>
+<li>add the following properties</li>
+</ol>
 <h2><a class="anchor" aria-hidden="true" id="configuration"></a><a href="#configuration" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Configuration</h2>
+<h3><a class="anchor" aria-hidden="true" id="cluster-mode"></a><a href="#cluster-mode" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Cluster mode</h3>
+<p>To utilize a redis cluster, following properties must be set.</p>
+<p>Note: some redis cloud service providers provide redis cluster service via a redis proxy, for these clusters, please follow the <a href="#standalone-mode">Standalone mode</a> configuration below.</p>
 <table>
 <thead>
-<tr><th><code>common.runtime.properties</code></th><th>Description</th><th>Default</th><th>Required</th></tr>
+<tr><th>Properties</th><th>Description</th><th>Default</th><th>Required</th></tr>
+</thead>
+<tbody>
+<tr><td><code>druid.cache.cluster.nodes</code></td><td>Redis nodes in a cluster, represented in comma separated string. See example below</td><td>None</td><td>yes</td></tr>
+<tr><td><code>druid.cache.cluster.maxRedirection</code></td><td>Max retry count</td><td>5</td><td>no</td></tr>
+</tbody>
+</table>
+<h4><a class="anchor" aria-hidden="true" id="example"></a><a href="#example" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Example</h4>
+<pre><code class="hljs css language-properties"><span class="hljs-comment"># a typical redis cluster with 6 nodes</span>
+<span class="hljs-meta">druid.cache.cluster.nodes</span>=<span class="hljs-string">127.0.0.1:7001,127.0.0.1:7002,127.0.0.1:7003,127.0.0.1:7004,127.0.0.1:7005,127.0.0.1:7006</span>
+</code></pre>
+<h3><a class="anchor" aria-hidden="true" id="standalone-mode"></a><a href="#standalone-mode" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Standalone mode</h3>
+<p>To use a standalone redis, following properties must be set.</p>
+<table>
+<thead>
+<tr><th>Properties</th><th>Description</th><th>Default</th><th>Required</th></tr>
 </thead>
 <tbody>
 <tr><td><code>druid.cache.host</code></td><td>Redis server host</td><td>None</td><td>yes</td></tr>
 <tr><td><code>druid.cache.port</code></td><td>Redis server port</td><td>None</td><td>yes</td></tr>
-<tr><td><code>druid.cache.expiration</code></td><td>Expiration(in milliseconds) for cache entries</td><td>24 * 3600 * 1000</td><td>no</td></tr>
-<tr><td><code>druid.cache.timeout</code></td><td>Timeout(in milliseconds) for get cache entries from Redis</td><td>2000</td><td>no</td></tr>
+<tr><td><code>druid.cache.database</code></td><td>Redis database index</td><td>0</td><td>no</td></tr>
+</tbody>
+</table>
+<p>Note: if both <code>druid.cache.cluster.nodes</code> and <code>druid.cache.host</code> are provided, cluster mode is preferred.</p>
+<h3><a class="anchor" aria-hidden="true" id="shared-properties"></a><a href="#shared-properties" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Shared Properties</h3>
+<p>Except for the properties above, there are some extra properties which can be customized to meet different needs.</p>
+<table>
+<thead>
+<tr><th>Properties</th><th>Description</th><th>Default</th><th>Required</th></tr>
+</thead>
+<tbody>
+<tr><td><code>druid.cache.password</code></td><td>Password to access redis server/cluster</td><td>None</td><td>no</td></tr>
+<tr><td><code>druid.cache.expiration</code></td><td>Expiration for cache entries</td><td>P1D</td><td>no</td></tr>
+<tr><td><code>druid.cache.timeout</code></td><td>Timeout for connecting to Redis and reading entries from Redis</td><td>PT2S</td><td>no</td></tr>
 <tr><td><code>druid.cache.maxTotalConnections</code></td><td>Max total connections to Redis</td><td>8</td><td>no</td></tr>
 <tr><td><code>druid.cache.maxIdleConnections</code></td><td>Max idle connections to Redis</td><td>8</td><td>no</td></tr>
 <tr><td><code>druid.cache.minIdleConnections</code></td><td>Min idle connections to Redis</td><td>0</td><td>no</td></tr>
 </tbody>
 </table>
-<h2><a class="anchor" aria-hidden="true" id="enabling"></a><a href="#enabling" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Enabling</h2>
-<p>To enable the redis cache, include this module on the loadList and set <code>druid.cache.type</code> to <code>redis</code> in your properties.</p>
+<p>For <code>druid.cache.expiration</code> and <code>druid.cache.timeout</code> properties, values can be format of <code>Period</code> or a number in milliseconds.</p>
+<pre><code class="hljs css language-properties"><span class="hljs-comment"># Period format(recomended)</span>
+<span class="hljs-comment"># cache expires after 1 hour</span>
+<span class="hljs-meta">druid.cache.expiration</span>=<span class="hljs-string">PT1H</span>
+<span class="hljs-comment">
+# or in number(milliseconds) format</span>
+<span class="hljs-comment"># 1 hour = 3_600_000 milliseconds</span>
+<span class="hljs-meta">druid.cache.expiration</span>=<span class="hljs-string">3600000</span>
+</code></pre>
 <h2><a class="anchor" aria-hidden="true" id="metrics"></a><a href="#metrics" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Metrics</h2>
 <p>In addition to the normal cache metrics, the redis cache implementation also reports the following in both <code>total</code> and <code>delta</code></p>
 <table>
@@ -109,7 +157,7 @@
 <tr><td><code>query/cache/redis/*/requests</code></td><td>Count of requests to redis cache</td><td>whatever request to redis will increase request count by 1</td></tr>
 </tbody>
 </table>
-</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/latest/development/extensions-contrib/opentsdb-emitter.html"><span class="arrow-prev">← </span><span class="function-name-prevnext">OpenTSDB Emitter</span></a><a class="docs-next button" href="/docs/latest/development/extensions-contrib/sqlserver.html"><span>Microsoft SQLServer</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#configuration">Configuration</a></li><li><a href="#enabling">Enabling</a></li><li><a href="#metrics">Metrics</a></li></ul></nav></div><footer class="nav-footer druid-footer" id="footer"><div class="container"><div class="text-center"><p><a href="/technology">Technology</a> · <a href="/use-cases">Use Cases</a> · <a href="/druid-powered">Powered by Druid</a> · <a href="/docs/latest/latest">Docs</a> · <a href="/community/">Community</a> · <a href="/downloads.html">Download</a> · <a href="/faq">FAQ</a></p></div><div class="text-center"><a title="Join the user group" href="https://groups.google.com/forum/#!forum/druid-user" target="_blank"><span class="fa fa-comments"></span></a> · <a title="Follow Druid" href="https://twitter.com/druidio" target="_blank"><span class="fab fa-twitter"></span></a> · <a title="Download via Apache" href="https://www.apache.org/dyn/closer.cgi?path=/incubator/druid/{{ site.druid_versions[0].versions[0].version }}/apache-druid-{{ site.druid_versions[0].versions[0].version }}-bin.tar.gz" target="_blank"><span class="fas fa-feather"></span></a> · <a title="GitHub" href="https://github.com/apache/druid" target="_blank"><span class="fab fa-github"></span></a></div><div class="text-center license">Copyright © 2019 <a href="https://www.apache.org/" target="_blank">Apache Software Foundation</a>.<br/>Except where otherwise noted, licensed under <a rel="license" href="http://creativecommons.org/licenses/by-sa/4.0/">CC BY-SA 4.0</a>.<br/>Apache Druid, Druid, and the Druid logo are either registered trademarks or trademarks of The Apache Software Foundation in the United States and other countries.</div></div></footer></div><script type="text/javascript" src="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.js"></script><script>
+</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/latest/development/extensions-contrib/opentsdb-emitter.html"><span class="arrow-prev">← </span><span class="function-name-prevnext">OpenTSDB Emitter</span></a><a class="docs-next button" href="/docs/latest/development/extensions-contrib/sqlserver.html"><span>Microsoft SQLServer</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#installation">Installation</a></li><li><a href="#enabling">Enabling</a></li><li><a href="#configuration">Configuration</a><ul class="toc-headings"><li><a href="#cluster-mode">Cluster mode</a></li><li><a href="#standalone-mode">Standalone mode</a></li><li><a href="#shared-properties">Shared Properties</a></li></ul></li><li><a href="#metrics">Metrics</a></li></ul></nav></div><footer class="nav-footer druid-footer" id="footer"><div class="container"><div class="text-center"><p><a href="/technology">Technology</a> · <a href="/use-cases">Use Cases</a> · <a href="/druid-powered">Powered by Druid</a> · <a href="/docs/latest/latest">Docs</a> · <a href="/community/">Community</a> · <a href="/downloads.html">Download</a> · <a href="/faq">FAQ</a></p></div><div class="text-center"><a title="Join the user group" href="https://groups.google.com/forum/#!forum/druid-user" target="_blank"><span class="fa fa-comments"></span></a> · <a title="Follow Druid" href="https://twitter.com/druidio" target="_blank"><span class="fab fa-twitter"></span></a> · <a title="Download via Apache" href="https://www.apache.org/dyn/closer.cgi?path=/incubator/druid/{{ site.druid_versions[0].versions[0].version }}/apache-druid-{{ site.druid_versions[0].versions[0].version }}-bin.tar.gz" target="_blank"><span class="fas fa-feather"></span></a> · <a title="GitHub" href="https://github.com/apache/druid" target="_blank"><span class="fab fa-github"></span></a></div><div class="text-center license">Copyright © 2019 <a href="https://www.apache.org/" target="_blank">Apache Software Foundation</a>.<br/>Except where otherwise noted, licensed under <a rel="license" href="http://creativecommons.org/licenses/by-sa/4.0/">CC BY-SA 4.0</a>.<br/>Apache Druid, Druid, and the Druid logo are either registered trademarks or trademarks of The Apache Software Foundation in the United States and other countries.</div></div></footer></div><script type="text/javascript" src="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.js"></script><script>
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\ No newline at end of file
diff --git a/docs/latest/development/extensions-contrib/sqlserver.html b/docs/latest/development/extensions-contrib/sqlserver.html
index 7ed1c63..463d0db 100644
--- a/docs/latest/development/extensions-contrib/sqlserver.html
+++ b/docs/latest/development/extensions-contrib/sqlserver.html
@@ -1,4 +1,4 @@
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+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Microsoft SQLServer · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/development/extensions-contrib/sqlserver.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.20.0" /><meta property="og:title" content="Microsoft SQLServer · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
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diff --git a/docs/latest/development/extensions-contrib/statsd.html b/docs/latest/development/extensions-contrib/statsd.html
index 5030226..a9ebd78 100644
--- a/docs/latest/development/extensions-contrib/statsd.html
+++ b/docs/latest/development/extensions-contrib/statsd.html
@@ -1,4 +1,4 @@
-<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>StatsD Emitter · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/development/extensions-contrib/statsd.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.19.0" /><meta property="og:title" content="StatsD Emitter · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>StatsD Emitter · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/development/extensions-contrib/statsd.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.20.0" /><meta property="og:title" content="StatsD Emitter · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
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diff --git a/docs/latest/development/extensions-contrib/tdigestsketch-quantiles.html b/docs/latest/development/extensions-contrib/tdigestsketch-quantiles.html
index 97b15f6..1a19d20 100644
--- a/docs/latest/development/extensions-contrib/tdigestsketch-quantiles.html
+++ b/docs/latest/development/extensions-contrib/tdigestsketch-quantiles.html
@@ -1,4 +1,4 @@
-<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>T-Digest Quantiles Sketch module · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/development/extensions-contrib/tdigestsketch-quantiles.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.19.0" /><meta property="og:title" content="T-Digest Quantiles Sketch module · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>T-Digest Quantiles Sketch module · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/development/extensions-contrib/tdigestsketch-quantiles.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.20.0" /><meta property="og:title" content="T-Digest Quantiles Sketch module · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
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diff --git a/docs/latest/development/extensions-contrib/thrift.html b/docs/latest/development/extensions-contrib/thrift.html
index 2aa57d2..87c2e8c 100644
--- a/docs/latest/development/extensions-contrib/thrift.html
+++ b/docs/latest/development/extensions-contrib/thrift.html
@@ -1,4 +1,4 @@
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+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Thrift · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/development/extensions-contrib/thrift.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.20.0" /><meta property="og:title" content="Thrift · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
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diff --git a/docs/latest/development/extensions-contrib/time-min-max.html b/docs/latest/development/extensions-contrib/time-min-max.html
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--- a/docs/latest/development/extensions-contrib/time-min-max.html
+++ b/docs/latest/development/extensions-contrib/time-min-max.html
@@ -1,4 +1,4 @@
-<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Timestamp Min/Max aggregators · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/development/extensions-contrib/time-min-max.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.19.0" /><meta property="og:title" content="Timestamp Min/Max aggregators · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Timestamp Min/Max aggregators · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/development/extensions-contrib/time-min-max.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.20.0" /><meta property="og:title" content="Timestamp Min/Max aggregators · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
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diff --git a/docs/latest/development/extensions-core/approximate-histograms.html b/docs/latest/development/extensions-core/approximate-histograms.html
index b5f9414..68add38 100644
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@@ -1,4 +1,4 @@
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diff --git a/docs/latest/development/extensions-core/google.html b/docs/latest/development/extensions-core/google.html
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@@ -1,4 +1,4 @@
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diff --git a/docs/latest/development/extensions-core/hdfs.html b/docs/latest/development/extensions-core/hdfs.html
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diff --git a/docs/latest/development/extensions-core/kafka-extraction-namespace.html b/docs/latest/development/extensions-core/kafka-extraction-namespace.html
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diff --git a/docs/latest/development/extensions-core/kafka-ingestion.html b/docs/latest/development/extensions-core/kafka-ingestion.html
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+++ b/docs/latest/development/extensions-core/kafka-ingestion.html
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diff --git a/docs/latest/development/extensions-core/kinesis-ingestion.html b/docs/latest/development/extensions-core/kinesis-ingestion.html
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--- a/docs/latest/development/extensions-core/kinesis-ingestion.html
+++ b/docs/latest/development/extensions-core/kinesis-ingestion.html
@@ -1,4 +1,4 @@
-<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Amazon Kinesis ingestion · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/development/extensions-core/kinesis-ingestion.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.19.0" /><meta property="og:title" content="Amazon Kinesis ingestion · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Amazon Kinesis ingestion · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/development/extensions-core/kinesis-ingestion.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.20.0" /><meta property="og:title" content="Amazon Kinesis ingestion · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
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 <h3><a class="anchor" aria-hidden="true" id="getting-supervisor-status-report"></a><a href="#getting-supervisor-status-report" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Getting Supervisor Status Report</h3>
 <p><code>GET /druid/indexer/v1/supervisor/&lt;supervisorId&gt;/status</code> returns a snapshot report of the current state of the tasks
 managed by the given supervisor. This includes the latest sequence numbers as reported by Kinesis. Unlike the Kafka
-Indexing Service, stats about lag are not yet supported.</p>
+Indexing Service, Kinesis reports lag metrics measured in time difference in milliseconds between the current sequence number and latest sequence number, rather than message count.</p>
 <p>The status report also contains the supervisor's state and a list of recently thrown exceptions (reported as
 <code>recentErrors</code>, whose max size can be controlled using the <code>druid.supervisor.maxStoredExceptionEvents</code> configuration).
 There are two fields related to the supervisor's state - <code>state</code> and <code>detailedState</code>. The <code>state</code> field will always be
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\ No newline at end of file
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+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Simple SSLContext Provider Module · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/development/extensions-core/simple-client-sslcontext.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.20.0" /><meta property="og:title" content="Simple SSLContext Provider Module · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
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\ No newline at end of file
diff --git a/docs/latest/development/extensions-core/stats.html b/docs/latest/development/extensions-core/stats.html
index 641d727..c61dc29 100644
--- a/docs/latest/development/extensions-core/stats.html
+++ b/docs/latest/development/extensions-core/stats.html
@@ -1,4 +1,4 @@
-<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Stats aggregator · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/development/extensions-core/stats.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.19.0" /><meta property="og:title" content="Stats aggregator · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Stats aggregator · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/development/extensions-core/stats.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.20.0" /><meta property="og:title" content="Stats aggregator · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
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@@ -91,6 +91,13 @@
 <p>This algorithm was proven to be numerically stable by J.L. Barlow in
 &quot;Error analysis of a pairwise summation algorithm to compute sample variance&quot;
 Numer. Math, 58 (1991) pp. 583--590</p>
+<blockquote>
+<p>As with all <a href="/docs/latest/querying/sql.html#aggregation-functions">aggregators</a>, the order of operations across segments is
+non-deterministic. This means that if this aggregator operates with an input type of &quot;float&quot; or &quot;double&quot;, the result
+of the aggregation may not be precisely the same across multiple runs of the query.</p>
+<p>To produce consistent results, round the variance to a fixed number of decimal places so that the results are
+precisely the same across query runs.</p>
+</blockquote>
 <h3><a class="anchor" aria-hidden="true" id="pre-aggregating-variance-at-ingestion-time"></a><a href="#pre-aggregating-variance-at-ingestion-time" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Pre-aggregating variance at ingestion time</h3>
 <p>To use this feature, an &quot;variance&quot; aggregator must be included at indexing time.
 The ingestion aggregator can only apply to numeric values. If you use &quot;variance&quot;
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\ No newline at end of file
diff --git a/docs/latest/development/extensions-core/test-stats.html b/docs/latest/development/extensions-core/test-stats.html
index 5f02a6b..ffc7269 100644
--- a/docs/latest/development/extensions-core/test-stats.html
+++ b/docs/latest/development/extensions-core/test-stats.html
@@ -1,4 +1,4 @@
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+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Test Stats Aggregators · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/development/extensions-core/test-stats.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.20.0" /><meta property="og:title" content="Test Stats Aggregators · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
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\ No newline at end of file
diff --git a/docs/latest/development/extensions.html b/docs/latest/development/extensions.html
index 8c838a2..d28b3ae 100644
--- a/docs/latest/development/extensions.html
+++ b/docs/latest/development/extensions.html
@@ -1,4 +1,4 @@
-<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Extensions · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/development/extensions.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.19.0" /><meta property="og:title" content="Extensions · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Extensions · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/development/extensions.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.20.0" /><meta property="og:title" content="Extensions · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
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\ No newline at end of file
diff --git a/docs/latest/development/geo.html b/docs/latest/development/geo.html
index c2e0272..4d3e484 100644
--- a/docs/latest/development/geo.html
+++ b/docs/latest/development/geo.html
@@ -1,4 +1,4 @@
-<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Spatial filters · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/development/geo.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.19.0" /><meta property="og:title" content="Spatial filters · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Spatial filters · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/development/geo.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.20.0" /><meta property="og:title" content="Spatial filters · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
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\ No newline at end of file
diff --git a/docs/latest/development/javascript.html b/docs/latest/development/javascript.html
index 52d1346..1572517 100644
--- a/docs/latest/development/javascript.html
+++ b/docs/latest/development/javascript.html
@@ -1,4 +1,4 @@
-<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>JavaScript programming guide · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/development/javascript.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.19.0" /><meta property="og:title" content="JavaScript programming guide · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>JavaScript programming guide · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/development/javascript.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.20.0" /><meta property="og:title" content="JavaScript programming guide · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
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\ No newline at end of file
diff --git a/docs/latest/development/modules.html b/docs/latest/development/modules.html
index d80630c..72def43 100644
--- a/docs/latest/development/modules.html
+++ b/docs/latest/development/modules.html
@@ -1,4 +1,4 @@
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diff --git a/docs/latest/development/overview.html b/docs/latest/development/overview.html
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+++ b/docs/latest/development/overview.html
@@ -1,4 +1,4 @@
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diff --git a/docs/latest/development/versioning.html b/docs/latest/development/versioning.html
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+++ b/docs/latest/development/versioning.html
@@ -1,4 +1,4 @@
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+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Versioning · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/development/versioning.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.20.0" /><meta property="og:title" content="Versioning · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
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diff --git a/docs/latest/ingestion/data-formats.html b/docs/latest/ingestion/data-formats.html
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@@ -1,4 +1,4 @@
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diff --git a/docs/latest/ingestion/data-management.html b/docs/latest/ingestion/data-management.html
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+++ b/docs/latest/ingestion/data-management.html
@@ -1,4 +1,4 @@
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diff --git a/docs/latest/ingestion/faq.html b/docs/latest/ingestion/faq.html
index 7103689..038cf70 100644
--- a/docs/latest/ingestion/faq.html
+++ b/docs/latest/ingestion/faq.html
@@ -1,4 +1,4 @@
-<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Ingestion troubleshooting FAQ · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/ingestion/faq.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.19.0" /><meta property="og:title" content="Ingestion troubleshooting FAQ · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Ingestion troubleshooting FAQ · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/ingestion/faq.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.20.0" /><meta property="og:title" content="Ingestion troubleshooting FAQ · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
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@@ -118,7 +118,6 @@
 <h2><a class="anchor" aria-hidden="true" id="i-dont-see-my-druid-segments-on-my-historical-processes"></a><a href="#i-dont-see-my-druid-segments-on-my-historical-processes" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>I don't see my Druid segments on my Historical processes</h2>
 <p>You can check the Coordinator console located at <code>&lt;COORDINATOR_IP&gt;:&lt;PORT&gt;</code>. Make sure that your segments have actually loaded on <a href="/docs/latest/design/historical.html">Historical processes</a>. If your segments are not present, check the Coordinator logs for messages about capacity of replication errors. One reason that segments are not downloaded is because Historical processes have maxSizes that are too small, making them incapable of downloading more data. You can change that with (for example):</p>
 <pre><code class="hljs"><span class="hljs-attr">-Ddruid.segmentCache.locations</span>=[{<span class="hljs-string">"path"</span>:<span class="hljs-string">"/tmp/druid/storageLocation"</span>,<span class="hljs-string">"maxSize"</span>:<span class="hljs-string">"500000000000"</span>}]
-<span class="hljs-attr">-Ddruid.server.maxSize</span>=<span class="hljs-number">500000000000</span>
 </code></pre>
 <h2><a class="anchor" aria-hidden="true" id="my-queries-are-returning-empty-results"></a><a href="#my-queries-are-returning-empty-results" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>My queries are returning empty results</h2>
 <p>You can use a <a href="/docs/latest/querying/segmentmetadataquery.html">segment metadata query</a> for the dimensions and metrics that have been created for your datasource. Make sure that the name of the aggregators you use in your query match one of these metrics. Also make sure that the query interval you specify match a valid time range where data exists.</p>
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diff --git a/docs/latest/ingestion/hadoop.html b/docs/latest/ingestion/hadoop.html
index b346214..c0b226a 100644
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+++ b/docs/latest/ingestion/hadoop.html
@@ -1,4 +1,4 @@
-<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Hadoop-based ingestion · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/ingestion/hadoop.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.19.0" /><meta property="og:title" content="Hadoop-based ingestion · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Hadoop-based ingestion · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/ingestion/hadoop.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.20.0" /><meta property="og:title" content="Hadoop-based ingestion · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
               window.dataLayer = window.dataLayer || [];
               function gtag(){dataLayer.push(arguments); }
               gtag('js', new Date());
@@ -411,6 +411,20 @@
 <tr><td>maxRowsPerSegment</td><td>Deprecated. Renamed to <code>targetRowsPerSegment</code>. Target number of rows to include in a partition, should be a number that targets segments of 500MB~1GB.</td><td>either this or <code>numShards</code></td></tr>
 <tr><td>numShards</td><td>Specify the number of partitions directly, instead of a target partition size. Ingestion will run faster, since it can skip the step necessary to select a number of partitions automatically.</td><td>either this or <code>maxRowsPerSegment</code></td></tr>
 <tr><td>partitionDimensions</td><td>The dimensions to partition on. Leave blank to select all dimensions. Only used with <code>numShards</code>, will be ignored when <code>targetRowsPerSegment</code> is set.</td><td>no</td></tr>
+<tr><td>partitionFunction</td><td>A function to compute hash of partition dimensions. See <a href="#hash-partition-function">Hash partition function</a></td><td><code>murmur3_32_abs</code></td><td>no</td></tr>
+</tbody>
+</table>
+<h5><a class="anchor" aria-hidden="true" id="hash-partition-function"></a><a href="#hash-partition-function" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Hash partition function</h5>
+<p>In hash partitioning, the partition function is used to compute hash of partition dimensions. The partition dimension
+values are first serialized into a byte array as a whole, and then the partition function is applied to compute hash of
+the byte array.
+Druid currently supports only one partition function.</p>
+<table>
+<thead>
+<tr><th>name</th><th>description</th></tr>
+</thead>
+<tbody>
+<tr><td><code>murmur3_32_abs</code></td><td>Applies an absolute value function to the result of <a href="https://guava.dev/releases/16.0/api/docs/com/google/common/hash/Hashing.html#murmur3_32()"><code>murmur3_32</code></a>.</td></tr>
 </tbody>
 </table>
 <h3><a class="anchor" aria-hidden="true" id="single-dimension-range-partitioning"></a><a href="#single-dimension-range-partitioning" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Single-dimension range partitioning</h3>
@@ -579,6 +593,6 @@
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                 indexName: 'apache_druid',
                 inputSelector: '#search_input_react',
-                algoliaOptions: {"facetFilters":["language:en","version:0.19.0"]}
+                algoliaOptions: {"facetFilters":["language:en","version:0.20.0"]}
               });
             </script></body></html>
\ No newline at end of file
diff --git a/docs/latest/ingestion/index.html b/docs/latest/ingestion/index.html
index cb23569..59e322f 100644
--- a/docs/latest/ingestion/index.html
+++ b/docs/latest/ingestion/index.html
@@ -1,4 +1,4 @@
-<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Ingestion · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/ingestion/index.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.19.0" /><meta property="og:title" content="Ingestion · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Ingestion · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/ingestion/index.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.20.0" /><meta property="og:title" content="Ingestion · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
               window.dataLayer = window.dataLayer || [];
               function gtag(){dataLayer.push(arguments); }
               gtag('js', new Date());
@@ -136,7 +136,7 @@
 <tr><td><strong>Input locations</strong></td><td>Any <a href="/docs/latest/ingestion/native-batch.html#input-sources"><code>inputSource</code></a>.</td><td>Any Hadoop FileSystem or Druid datasource.</td><td>Any <a href="/docs/latest/ingestion/native-batch.html#input-sources"><code>inputSource</code></a>.</td></tr>
 <tr><td><strong>File formats</strong></td><td>Any <a href="/docs/latest/ingestion/data-formats.html#input-format"><code>inputFormat</code></a>.</td><td>Any Hadoop InputFormat.</td><td>Any <a href="/docs/latest/ingestion/data-formats.html#input-format"><code>inputFormat</code></a>.</td></tr>
 <tr><td><strong><a href="#rollup">Rollup modes</a></strong></td><td>Perfect if <code>forceGuaranteedRollup</code> = true in the <a href="/docs/latest/ingestion/native-batch.html#tuningconfig"><code>tuningConfig</code></a>.</td><td>Always perfect.</td><td>Perfect if <code>forceGuaranteedRollup</code> = true in the <a href="/docs/latest/ingestion/native-batch.html#tuningconfig"><code>tuningConfig</code></a>.</td></tr>
-<tr><td><strong>Partitioning options</strong></td><td>Dynamic, hash-based, and range-based partitioning methods are available. See <a href="/docs/latest/ingestion/native-batch.html#partitionsspec">Partitions Spec</a> for details.</td><td>Hash-based or range-based partitioning via <a href="/docs/latest/ingestion/hadoop.html#partitionsspec"><code>partitionsSpec</code></a>.</td><td>Dynamic and hash-based partitioning methods are available. See <a href="/docs/latest/ingestion/native-batch.html#partitionsspec">Partitions Spec</a> for details.</td></tr>
+<tr><td><strong>Partitioning options</strong></td><td>Dynamic, hash-based, and range-based partitioning methods are available. See <a href="/docs/latest/ingestion/native-batch.html#partitionsspec">Partitions Spec</a> for details.</td><td>Hash-based or range-based partitioning via <a href="/docs/latest/ingestion/hadoop.html#partitionsspec"><code>partitionsSpec</code></a>.</td><td>Dynamic and hash-based partitioning methods are available. See <a href="/docs/latest/ingestion/native-batch.html#partitionsspec-1">Partitions Spec</a> for details.</td></tr>
 </tbody>
 </table>
 <p><a name="data-model"></a></p>
@@ -295,7 +295,7 @@
 <p><a name="spec"></a></p>
 <h2><a class="anchor" aria-hidden="true" id="ingestion-specs"></a><a href="#ingestion-specs" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Ingestion specs</h2>
 <p>No matter what ingestion method you use, data is loaded into Druid using either one-time <a href="tasks.html">tasks</a> or
-ongoing &quot;supervisors&quot; (which run and supervised a set of tasks over time). In any case, part of the task or supervisor
+ongoing &quot;supervisors&quot; (which run and supervise a set of tasks over time). In any case, part of the task or supervisor
 definition is an <em>ingestion spec</em>.</p>
 <p>Ingestion specs consists of three main components:</p>
 <ul>
@@ -461,8 +461,8 @@
 <tr><th>Field</th><th>Description</th><th>Default</th></tr>
 </thead>
 <tbody>
-<tr><td>dimensions</td><td>A list of <a href="#dimension-objects">dimension names or objects</a>. Cannot have the same column in both <code>dimensions</code> and <code>dimensionExclusions</code>.<br><br>If this is an empty array, Druid will treat all non-timestamp, non-metric columns that do not appear in <code>dimensionExclusions</code> as String-typed dimension columns (see <a href="#inclusions-and-exclusions">inclusions and exclusions</a> below).</td><td><code>[]</code></td></tr>
-<tr><td>dimensionExclusions</td><td>The names of dimensions to exclude from ingestion. Only names are supported here, not objects. Cannot have the same column in both <code>dimensions</code> and <code>dimensionExclusions</code>.</td><td><code>[]</code></td></tr>
+<tr><td>dimensions</td><td>A list of <a href="#dimension-objects">dimension names or objects</a>. Cannot have the same column in both <code>dimensions</code> and <code>dimensionExclusions</code>.<br><br>If this and <code>spatialDimensions</code> are both null or empty arrays, Druid will treat all non-timestamp, non-metric columns that do not appear in <code>dimensionExclusions</code> as String-typed dimension columns. See <a href="#inclusions-and-exclusions">inclusions and exclusions</a> below for details.</td><td><code>[]</code></td></tr>
+<tr><td>dimensionExclusions</td><td>The names of dimensions to exclude from ingestion. Only names are supported here, not objects.<br><br>This list is only used if the <code>dimensions</code> and <code>spatialDimensions</code> lists are both null or empty arrays; otherwise it is ignored. See <a href="#inclusions-and-exclusions">inclusions and exclusions</a> below for details.</td><td><code>[]</code></td></tr>
 <tr><td>spatialDimensions</td><td>An array of <a href="/docs/latest/development/geo.html">spatial dimensions</a>.</td><td><code>[]</code></td></tr>
 </tbody>
 </table>
@@ -482,7 +482,7 @@
 </table>
 <h4><a class="anchor" aria-hidden="true" id="inclusions-and-exclusions"></a><a href="#inclusions-and-exclusions" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Inclusions and exclusions</h4>
 <p>Druid will interpret a <code>dimensionsSpec</code> in two possible ways: <em>normal</em> or <em>schemaless</em>.</p>
-<p>Normal interpretation occurs when either <code>dimensions</code> or <code>spatialDimensions</code> is non-empty. In this case, the combination of the two lists will be taken as the set of dimensions to be ingested.</p>
+<p>Normal interpretation occurs when either <code>dimensions</code> or <code>spatialDimensions</code> is non-empty. In this case, the combination of the two lists will be taken as the set of dimensions to be ingested, and the list of <code>dimensionExclusions</code> will be ignored.</p>
 <p>Schemaless interpretation occurs when both <code>dimensions</code> and <code>spatialDimensions</code> are empty or null. In this case, the set of dimensions is determined in the following way:</p>
 <ol>
 <li>First, start from the set of all input fields from the <a href="/docs/latest/ingestion/data-formats.html"><code>inputFormat</code></a> (or the <a href="/docs/latest/ingestion/data-formats.html#flattenspec"><code>flattenSpec</code></a>, if one is being used).</li>
@@ -723,6 +723,6 @@
                 apiKey: '2de99082a9f38e49dfaa059bbe4c901d',
                 indexName: 'apache_druid',
                 inputSelector: '#search_input_react',
-                algoliaOptions: {"facetFilters":["language:en","version:0.19.0"]}
+                algoliaOptions: {"facetFilters":["language:en","version:0.20.0"]}
               });
             </script></body></html>
\ No newline at end of file
diff --git a/docs/latest/ingestion/native-batch.html b/docs/latest/ingestion/native-batch.html
index 061dc74..5675306 100644
--- a/docs/latest/ingestion/native-batch.html
+++ b/docs/latest/ingestion/native-batch.html
@@ -1,4 +1,4 @@
-<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Native batch ingestion · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/ingestion/native-batch.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.19.0" /><meta property="og:title" content="Native batch ingestion · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Native batch ingestion · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/ingestion/native-batch.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.20.0" /><meta property="og:title" content="Native batch ingestion · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
               window.dataLayer = window.dataLayer || [];
               function gtag(){dataLayer.push(arguments); }
               gtag('js', new Date());
@@ -114,6 +114,8 @@
 <p>Some other cloud storage types are supported with the legacy <a href="#firehoses-deprecated"><code>firehose</code></a>.
 The below <code>firehose</code> types are also splittable. Note that only text formats are supported
 with the <code>firehose</code>.</p>
+<h3><a class="anchor" aria-hidden="true" id="compression-formats-supported"></a><a href="#compression-formats-supported" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Compression formats supported</h3>
+<p>The supported compression formats for native batch ingestion are <code>bz2</code>, <code>gz</code>, <code>xz</code>, <code>zip</code>, <code>sz</code> (Snappy), and <code>zst</code> (ZSTD).</p>
 <ul>
 <li><a href="/docs/latest/development/extensions-contrib/cloudfiles.html#firehose"><code>static-cloudfiles</code></a></li>
 </ul>
@@ -278,7 +280,8 @@
 </thead>
 <tbody>
 <tr><td>type</td><td>This should always be <code>maxSize</code>.</td><td>none</td><td>yes</td></tr>
-<tr><td>maxSplitSize</td><td>Maximum number of bytes of input files to process in a single task. If a single file is larger than this number, it will be processed by itself in a single task (Files are never split across tasks yet).</td><td>500MB</td><td>no</td></tr>
+<tr><td>maxSplitSize</td><td>Maximum number of bytes of input files to process in a single subtask. If a single file is larger than this number, it will be processed by itself in a single subtask (Files are never split across tasks yet). Note that one subtask will not process more files than <code>maxNumFiles</code> even when their total size is smaller than <code>maxSplitSize</code>. <a href="/docs/latest/configuration/human-readable-byte.html">Human-readable format</a> is supported.</td><td>1GiB</td><td>no</td></tr>
+<tr><td>maxNumFiles</td><td>Maximum number of input files to process in a single subtask. This limit is to avoid task failures when the ingestion spec is too long. There are two known limits on the max size of serialized ingestion spec, i.e., the max ZNode size in ZooKeeper (<code>jute.maxbuffer</code>) and the max packet size in MySQL (<code>max_allowed_packet</code>). These can make ingestion tasks fail if the serialized ingestion spec size hits one of them. Note that one subtask will not process more data than <code>maxSplitSize</code> even when the total number of files is smaller than <code>maxNumFiles</code>.</td><td>1000</td><td>no</td></tr>
 </tbody>
 </table>
 <h4><a class="anchor" aria-hidden="true" id="segments-split-hint-spec"></a><a href="#segments-split-hint-spec" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Segments Split Hint Spec</h4>
@@ -289,7 +292,8 @@
 </thead>
 <tbody>
 <tr><td>type</td><td>This should always be <code>segments</code>.</td><td>none</td><td>yes</td></tr>
-<tr><td>maxInputSegmentBytesPerTask</td><td>Maximum number of bytes of input segments to process in a single task. If a single segment is larger than this number, it will be processed by itself in a single task (input segments are never split across tasks).</td><td>500MB</td><td>no</td></tr>
+<tr><td>maxInputSegmentBytesPerTask</td><td>Maximum number of bytes of input segments to process in a single subtask. If a single segment is larger than this number, it will be processed by itself in a single subtask (input segments are never split across tasks). Note that one subtask will not process more segments than <code>maxNumSegments</code> even when their total size is smaller than <code>maxInputSegmentBytesPerTask</code>. <a href="/docs/latest/configuration/human-readable-byte.html">Human-readable format</a> is supported.</td><td>1GiB</td><td>no</td></tr>
+<tr><td>maxNumSegments</td><td>Maximum number of input segments to process in a single subtask. This limit is to avoid task failures when the ingestion spec is too long. There are two known limits on the max size of serialized ingestion spec, i.e., the max ZNode size in ZooKeeper (<code>jute.maxbuffer</code>) and the max packet size in MySQL (<code>max_allowed_packet</code>). These can make ingestion tasks fail if the serialized ingestion spec size hits one of them. Note that one subtask will not process more data than <code>maxInputSegmentBytesPerTask</code> even when the total number of segments is smaller than <code>maxNumSegments</code>.</td><td>1000</td><td>no</td></tr>
 </tbody>
 </table>
 <h3><a class="anchor" aria-hidden="true" id="partitionsspec"></a><a href="#partitionsspec" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a><code>partitionsSpec</code></h3>
@@ -300,11 +304,11 @@
 <p>The three <code>partitionsSpec</code> types have different characteristics.</p>
 <table>
 <thead>
-<tr><th>PartitionsSpec</th><th>Ingestion speed</th><th>Partitioning method</th><th>Supported rollup mode</th><th>Segment pruning at query time</th></tr>
+<tr><th>PartitionsSpec</th><th>Ingestion speed</th><th>Partitioning method</th><th>Supported rollup mode</th><th>Secondary partition pruning at query time</th></tr>
 </thead>
 <tbody>
 <tr><td><code>dynamic</code></td><td>Fastest</td><td>Partitioning based on number of rows in segment.</td><td>Best-effort rollup</td><td>N/A</td></tr>
-<tr><td><code>hashed</code></td><td>Moderate</td><td>Partitioning based on the hash value of partition dimensions. This partitioning may reduce your datasource size and query latency by improving data locality. See <a href="/docs/latest/ingestion/index.html#partitioning">Partitioning</a> for more details.</td><td>Perfect rollup</td><td>N/A</td></tr>
+<tr><td><code>hashed</code></td><td>Moderate</td><td>Partitioning based on the hash value of partition dimensions. This partitioning may reduce your datasource size and query latency by improving data locality. See <a href="/docs/latest/ingestion/index.html#partitioning">Partitioning</a> for more details.</td><td>Perfect rollup</td><td>The broker can use the partition information to prune segments early to speed up queries. Since the broker knows how to hash <code>partitionDimensions</code> values to locate a segment, given a query including a filter on all the <code>partitionDimensions</code>, the broker can pick up only the segments holding the rows satisfying the filter on <code>partitionDimensions</code> for query processing.<br/><br/>Note that <code>partitionDimensions</code> must be set at ingestion time to enable secondary partition pruning at query time.</td></tr>
 <tr><td><code>single_dim</code></td><td>Slowest</td><td>Range partitioning based on the value of the partition dimension. Segment sizes may be skewed depending on the partition key distribution. This may reduce your datasource size and query latency by improving data locality. See <a href="/docs/latest/ingestion/index.html#partitioning">Partitioning</a> for more details.</td><td>Perfect rollup</td><td>The broker can use the partition information to prune segments early to speed up queries. Since the broker knows the range of <code>partitionDimension</code> values in each segment, given a query including a filter on the <code>partitionDimension</code>, the broker can pick up only the segments holding the rows satisfying the filter on <code>partitionDimension</code> for query processing.</td></tr>
 </tbody>
 </table>
@@ -312,7 +316,7 @@
 <ul>
 <li>If your data has a uniformly distributed column which is frequently used in your queries,
 consider using <code>single_dim</code> partitionsSpec to maximize the performance of most of your queries.</li>
-<li>If your data doesn't a uniformly distributed column, but is expected to have a <a href="/docs/latest/ingestion/index.html#maximizing-rollup-ratio">high rollup ratio</a>
+<li>If your data doesn't have a uniformly distributed column, but is expected to have a <a href="/docs/latest/ingestion/index.html#maximizing-rollup-ratio">high rollup ratio</a>
 when you roll up with some dimensions, consider using <code>hashed</code> partitionsSpec.
 It could reduce the size of datasource and query latency by improving data locality.</li>
 <li>If the above two scenarios are not the case or you don't need to roll up your datasource,
@@ -345,13 +349,21 @@
 </thead>
 <tbody>
 <tr><td>type</td><td>This should always be <code>hashed</code></td><td>none</td><td>yes</td></tr>
-<tr><td>numShards</td><td>Directly specify the number of shards to create. If this is specified and <code>intervals</code> is specified in the <code>granularitySpec</code>, the index task can skip the determine intervals/partitions pass through the data.</td><td>null</td><td>yes</td></tr>
+<tr><td>numShards</td><td>Directly specify the number of shards to create. If this is specified and <code>intervals</code> is specified in the <code>granularitySpec</code>, the index task can skip the determine intervals/partitions pass through the data. This property and <code>targetRowsPerSegment</code> cannot both be set.</td><td>none</td><td>no</td></tr>
+<tr><td>targetRowsPerSegment</td><td>A target row count for each partition. If <code>numShards</code> is left unspecified, the Parallel task will determine a partition count automatically such that each partition has a row count close to the target, assuming evenly distributed keys in the input data. A target per-segment row count of 5 million is used if both <code>numShards</code> and <code>targetRowsPerSegment</code> are null.</td><td>null (or 5,000,000 if both <code>numShards</code> and <code>targetRowsPerSegment</code> are null)</td><td>no</td></tr>
 <tr><td>partitionDimensions</td><td>The dimensions to partition on. Leave blank to select all dimensions.</td><td>null</td><td>no</td></tr>
+<tr><td>partitionFunction</td><td>A function to compute hash of partition dimensions. See <a href="#hash-partition-function">Hash partition function</a></td><td><code>murmur3_32_abs</code></td><td>no</td></tr>
 </tbody>
 </table>
 <p>The Parallel task with hash-based partitioning is similar to <a href="https://en.wikipedia.org/wiki/MapReduce">MapReduce</a>.
-The task runs in 2 phases, i.e., <code>partial segment generation</code> and <code>partial segment merge</code>.</p>
+The task runs in up to 3 phases: <code>partial dimension cardinality</code>, <code>partial segment generation</code> and <code>partial segment merge</code>.</p>
 <ul>
+<li>The <code>partial dimension cardinality</code> phase is an optional phase that only runs if <code>numShards</code> is not specified.
+The Parallel task splits the input data and assigns them to worker tasks based on the split hint spec.
+Each worker task (type <code>partial_dimension_cardinality</code>) gathers estimates of partitioning dimensions cardinality for
+each time chunk. The Parallel task will aggregate these estimates from the worker tasks and determine the highest
+cardinality across all of the time chunks in the input data, dividing this cardinality by <code>targetRowsPerSegment</code> to
+automatically determine <code>numShards</code>.</li>
 <li>In the <code>partial segment generation</code> phase, just like the Map phase in MapReduce,
 the Parallel task splits the input data based on the split hint spec
 and assigns each split to a worker task. Each worker task (type <code>partial_index_generate</code>) reads the assigned split,
@@ -366,10 +378,23 @@
 falling in the same time chunk and the same hash value from multiple MiddleManager/Indexer processes and merges
 them to create the final segments. Finally, they push the final segments to the deep storage at once.</li>
 </ul>
+<h5><a class="anchor" aria-hidden="true" id="hash-partition-function"></a><a href="#hash-partition-function" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Hash partition function</h5>
+<p>In hash partitioning, the partition function is used to compute hash of partition dimensions. The partition dimension
+values are first serialized into a byte array as a whole, and then the partition function is applied to compute hash of
+the byte array.
+Druid currently supports only one partition function.</p>
+<table>
+<thead>
+<tr><th>name</th><th>description</th></tr>
+</thead>
+<tbody>
+<tr><td><code>murmur3_32_abs</code></td><td>Applies an absolute value function to the result of <a href="https://guava.dev/releases/16.0/api/docs/com/google/common/hash/Hashing.html#murmur3_32()"><code>murmur3_32</code></a>.</td></tr>
+</tbody>
+</table>
 <h4><a class="anchor" aria-hidden="true" id="single-dimension-range-partitioning"></a><a href="#single-dimension-range-partitioning" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Single-dimension range partitioning</h4>
 <blockquote>
 <p>Single dimension range partitioning is currently not supported in the sequential mode of the Parallel task.
-Try set <code>maxNumConcurrentSubTasks</code> to larger than 1 to use this partitioning.</p>
+The Parallel task will use one subtask when you set <code>maxNumConcurrentSubTasks</code> to 1.</p>
 </blockquote>
 <table>
 <thead>
@@ -784,6 +809,7 @@
 <tr><td>maxRowsPerSegment</td><td>Used in sharding. Determines how many rows are in each segment.</td><td>5000000</td><td>no</td></tr>
 <tr><td>numShards</td><td>Directly specify the number of shards to create. If this is specified and <code>intervals</code> is specified in the <code>granularitySpec</code>, the index task can skip the determine intervals/partitions pass through the data. <code>numShards</code> cannot be specified if <code>maxRowsPerSegment</code> is set.</td><td>null</td><td>no</td></tr>
 <tr><td>partitionDimensions</td><td>The dimensions to partition on. Leave blank to select all dimensions.</td><td>null</td><td>no</td></tr>
+<tr><td>partitionFunction</td><td>A function to compute hash of partition dimensions. See <a href="#hash-partition-function">Hash partition function</a></td><td><code>murmur3_32_abs</code></td><td>no</td></tr>
 </tbody>
 </table>
 <p>For best-effort rollup, you should use <code>dynamic</code>.</p>
@@ -1379,6 +1405,45 @@
 <li><p>Pagination may be used on the SQL queries to ensure that each query pulls a similar amount of data, thereby improving the efficiency of the sub-tasks.</p></li>
 <li><p>Similar to file-based input formats, any updates to existing data will replace the data in segments specific to the intervals specified in the <code>granularitySpec</code>.</p></li>
 </ul>
+<h3><a class="anchor" aria-hidden="true" id="combining-input-source"></a><a href="#combining-input-source" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Combining Input Source</h3>
+<p>The Combining input source is used to read data from multiple InputSources. This input source should be only used if all the delegate input sources are
+<em>splittable</em> and can be used by the <a href="#parallel-task">Parallel task</a>. This input source will identify the splits from its delegates and each split will be processed by a worker task. Similar to other input sources, this input source supports a single <code>inputFormat</code>. Therefore, please note that delegate input sources requiring an <code>inputFormat</code> must have the same format for input data.</p>
+<table>
+<thead>
+<tr><th>property</th><th>description</th><th>required?</th></tr>
+</thead>
+<tbody>
+<tr><td>type</td><td>This should be &quot;combining&quot;.</td><td>Yes</td></tr>
+<tr><td>delegates</td><td>List of <em>splittable</em> InputSources to read data from.</td><td>Yes</td></tr>
+</tbody>
+</table>
+<p>Sample spec:</p>
+<pre><code class="hljs css language-json">...
+    "ioConfig": {
+      "type": "index_parallel",
+      "inputSource": {
+        "type": "combining",
+        "delegates" : [
+         {
+          "type": "local",
+          "filter" : "*.csv",
+          "baseDir": "/data/directory",
+          "files": ["/bar/foo", "/foo/bar"]
+         },
+         {
+          "type": "druid",
+          "dataSource": "wikipedia",
+          "interval": "2013-01-01/2013-01-02"
+         }
+        ]
+      },
+      "inputFormat": {
+        "type": "csv"
+      },
+      ...
+    },
+...
+</code></pre>
 <h3></h3>
 <h2><a class="anchor" aria-hidden="true" id="firehoses-deprecated"></a><a href="#firehoses-deprecated" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Firehoses (Deprecated)</h2>
 <p>Firehoses are deprecated in 0.17.0. It's highly recommended to use the <a href="#input-sources">Input source</a> instead.
@@ -1681,7 +1746,7 @@
 <tr><td>delegates</td><td>List of Firehoses to combine data from</td><td>yes</td></tr>
 </tbody>
 </table>
-</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/latest/ingestion/standalone-realtime.html"><span class="arrow-prev">← </span><span>Realtime Process</span></a><a class="docs-next button" href="/docs/latest/ingestion/hadoop.html"><span>Hadoop-based</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#tutorial">Tutorial</a></li><li><a href="#parallel-task">Parallel task</a><ul class="toc-headings"><li><a href="#task-syntax">Task syntax</a></li><li><a href="#dataschema"><code>dataSchema</code></a></li><li><a href="#ioconfig"><code>ioConfig</code></a></li><li><a href="#tuningconfig"><code>tuningConfig</code></a></li><li><a href="#split-hint-spec">Split Hint Spec</a></li><li><a href="#partitionsspec"><code>partitionsSpec</code></a></li><li><a href="#http-status-endpoints">HTTP status endpoints</a></li><li><a href="#capacity-planning">Capacity planning</a></li></ul></li><li><a href="#simple-task">Simple task</a><ul class="toc-headings"><li><a href="#task-syntax-1">Task syntax</a></li><li><a href="#dataschema-1"><code>dataSchema</code></a></li><li><a href="#ioconfig-1"><code>ioConfig</code></a></li><li><a href="#tuningconfig-1"><code>tuningConfig</code></a></li><li><a href="#partitionsspec-1"><code>partitionsSpec</code></a></li><li><a href="#segmentwriteoutmediumfactory"><code>segmentWriteOutMediumFactory</code></a></li><li><a href="#segment-pushing-modes">Segment pushing modes</a></li></ul></li><li><a href="#input-sources">Input Sources</a><ul class="toc-headings"><li><a href="#s3-input-source">S3 Input Source</a></li><li><a href="#google-cloud-storage-input-source">Google Cloud Storage Input Source</a></li><li><a href="#azure-input-source">Azure Input Source</a></li><li><a href="#hdfs-input-source">HDFS Input Source</a></li><li><a href="#http-input-source">HTTP Input Source</a></li><li><a href="#inline-input-source">Inline Input Source</a></li><li><a href="#local-input-source">Local Input Source</a></li><li><a href="#druid-input-source">Druid Input Source</a></li><li><a href="#sql-input-source">SQL Input Source</a></li></ul></li><li><a href="#firehoses-deprecated">Firehoses (Deprecated)</a><ul class="toc-headings"><li><a href="#statics3firehose">StaticS3Firehose</a></li><li><a href="#hdfsfirehose">HDFSFirehose</a></li><li><a href="#localfirehose">LocalFirehose</a></li><li><a href="#httpfirehose">HttpFirehose</a></li><li><a href="#ingestsegmentfirehose">IngestSegmentFirehose</a></li><li><a href="#sqlfirehose">SqlFirehose</a></li><li><a href="#inlinefirehose">InlineFirehose</a></li><li><a href="#combiningfirehose">CombiningFirehose</a></li></ul></li></ul></nav></div><footer class="nav-footer druid-footer" id="footer"><div class="container"><div class="text-center"><p><a href="/technology">Technology</a> · <a href="/use-cases">Use Cases</a> · <a href="/druid-powered">Powered by Druid</a> · <a href="/docs/latest/latest">Docs</a> · <a href="/community/">Community</a> · <a href="/downloads.html">Download</a> · <a href="/faq">FAQ</a></p></div><div class="text-center"><a title="Join the user group" href="https://groups.google.com/forum/#!forum/druid-user" target="_blank"><span class="fa fa-comments"></span></a> · <a title="Follow Druid" href="https://twitter.com/druidio" target="_blank"><span class="fab fa-twitter"></span></a> · <a title="Download via Apache" href="https://www.apache.org/dyn/closer.cgi?path=/incubator/druid/{{ site.druid_versions[0].versions[0].version }}/apache-druid-{{ site.druid_versions[0].versions[0].version }}-bin.tar.gz" target="_blank"><span class="fas fa-feather"></span></a> · <a title="GitHub" href="https://github.com/apache/druid" target="_blank"><span class="fab fa-github"></span></a></div><div class="text-center license">Copyright © 2019 <a href="https://www.apache.org/" target="_blank">Apache Software Foundation</a>.<br/>Except where otherwise noted, licensed under <a rel="license" href="http://creativecommons.org/licenses/by-sa/4.0/">CC BY-SA 4.0</a>.<br/>Apache Druid, Druid, and the Druid logo are either registered trademarks or trademarks of The Apache Software Foundation in the United States and other countries.</div></div></footer></div><script type="text/javascript" src="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.js"></script><script>
+</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/latest/ingestion/standalone-realtime.html"><span class="arrow-prev">← </span><span>Realtime Process</span></a><a class="docs-next button" href="/docs/latest/ingestion/hadoop.html"><span>Hadoop-based</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#tutorial">Tutorial</a></li><li><a href="#parallel-task">Parallel task</a><ul class="toc-headings"><li><a href="#compression-formats-supported">Compression formats supported</a></li><li><a href="#task-syntax">Task syntax</a></li><li><a href="#dataschema"><code>dataSchema</code></a></li><li><a href="#ioconfig"><code>ioConfig</code></a></li><li><a href="#tuningconfig"><code>tuningConfig</code></a></li><li><a href="#split-hint-spec">Split Hint Spec</a></li><li><a href="#partitionsspec"><code>partitionsSpec</code></a></li><li><a href="#http-status-endpoints">HTTP status endpoints</a></li><li><a href="#capacity-planning">Capacity planning</a></li></ul></li><li><a href="#simple-task">Simple task</a><ul class="toc-headings"><li><a href="#task-syntax-1">Task syntax</a></li><li><a href="#dataschema-1"><code>dataSchema</code></a></li><li><a href="#ioconfig-1"><code>ioConfig</code></a></li><li><a href="#tuningconfig-1"><code>tuningConfig</code></a></li><li><a href="#partitionsspec-1"><code>partitionsSpec</code></a></li><li><a href="#segmentwriteoutmediumfactory"><code>segmentWriteOutMediumFactory</code></a></li><li><a href="#segment-pushing-modes">Segment pushing modes</a></li></ul></li><li><a href="#input-sources">Input Sources</a><ul class="toc-headings"><li><a href="#s3-input-source">S3 Input Source</a></li><li><a href="#google-cloud-storage-input-source">Google Cloud Storage Input Source</a></li><li><a href="#azure-input-source">Azure Input Source</a></li><li><a href="#hdfs-input-source">HDFS Input Source</a></li><li><a href="#http-input-source">HTTP Input Source</a></li><li><a href="#inline-input-source">Inline Input Source</a></li><li><a href="#local-input-source">Local Input Source</a></li><li><a href="#druid-input-source">Druid Input Source</a></li><li><a href="#sql-input-source">SQL Input Source</a></li><li><a href="#combining-input-source">Combining Input Source</a></li></ul></li><li><a href="#firehoses-deprecated">Firehoses (Deprecated)</a><ul class="toc-headings"><li><a href="#statics3firehose">StaticS3Firehose</a></li><li><a href="#hdfsfirehose">HDFSFirehose</a></li><li><a href="#localfirehose">LocalFirehose</a></li><li><a href="#httpfirehose">HttpFirehose</a></li><li><a href="#ingestsegmentfirehose">IngestSegmentFirehose</a></li><li><a href="#sqlfirehose">SqlFirehose</a></li><li><a href="#inlinefirehose">InlineFirehose</a></li><li><a href="#combiningfirehose">CombiningFirehose</a></li></ul></li></ul></nav></div><footer class="nav-footer druid-footer" id="footer"><div class="container"><div class="text-center"><p><a href="/technology">Technology</a> · <a href="/use-cases">Use Cases</a> · <a href="/druid-powered">Powered by Druid</a> · <a href="/docs/latest/latest">Docs</a> · <a href="/community/">Community</a> · <a href="/downloads.html">Download</a> · <a href="/faq">FAQ</a></p></div><div class="text-center"><a title="Join the user group" href="https://groups.google.com/forum/#!forum/druid-user" target="_blank"><span class="fa fa-comments"></span></a> · <a title="Follow Druid" href="https://twitter.com/druidio" target="_blank"><span class="fab fa-twitter"></span></a> · <a title="Download via Apache" href="https://www.apache.org/dyn/closer.cgi?path=/incubator/druid/{{ site.druid_versions[0].versions[0].version }}/apache-druid-{{ site.druid_versions[0].versions[0].version }}-bin.tar.gz" target="_blank"><span class="fas fa-feather"></span></a> · <a title="GitHub" href="https://github.com/apache/druid" target="_blank"><span class="fab fa-github"></span></a></div><div class="text-center license">Copyright © 2019 <a href="https://www.apache.org/" target="_blank">Apache Software Foundation</a>.<br/>Except where otherwise noted, licensed under <a rel="license" href="http://creativecommons.org/licenses/by-sa/4.0/">CC BY-SA 4.0</a>.<br/>Apache Druid, Druid, and the Druid logo are either registered trademarks or trademarks of The Apache Software Foundation in the United States and other countries.</div></div></footer></div><script type="text/javascript" src="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.js"></script><script>
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@@ -1,4 +1,4 @@
-<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Expressions · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/misc/math-expr.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.19.0" /><meta property="og:title" content="Expressions · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Expressions · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/misc/math-expr.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.20.0" /><meta property="og:title" content="Expressions · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
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@@ -134,6 +134,8 @@
 <tr><td>parse_long</td><td>parse_long(string[, radix]) parses a string as a long with the given radix, or 10 (decimal) if a radix is not provided.</td></tr>
 <tr><td>regexp_extract</td><td>regexp_extract(expr, pattern[, index]) applies a regular expression pattern and extracts a capture group index, or null if there is no match. If index is unspecified or zero, returns the substring that matched the pattern. The pattern may match anywhere inside <code>expr</code>; if you want to match the entire string instead, use the <code>^</code> and <code>$</code> markers at the start and end of your pattern.</td></tr>
 <tr><td>regexp_like</td><td>regexp_like(expr, pattern) returns whether <code>expr</code> matches regular expression <code>pattern</code>. The pattern may match anywhere inside <code>expr</code>; if you want to match the entire string instead, use the <code>^</code> and <code>$</code> markers at the start and end of your pattern.</td></tr>
+<tr><td>contains_string</td><td>contains_string(expr, string) returns whether <code>expr</code> contains <code>string</code> as a substring. This method is case-sensitive.</td></tr>
+<tr><td>icontains_string</td><td>contains_string(expr, string) returns whether <code>expr</code> contains <code>string</code> as a substring. This method is case-insensitive.</td></tr>
 <tr><td>replace</td><td>replace(expr, pattern, replacement) replaces pattern with replacement</td></tr>
 <tr><td>substring</td><td>substring(expr, index, length) behaves like java.lang.String's substring</td></tr>
 <tr><td>right</td><td>right(expr, length) returns the rightmost length characters from a string</td></tr>
@@ -252,7 +254,7 @@
 <tr><td>all(lambda,arr)</td><td>returns 1 if all elements in the array matches the lambda expression, else 0</td></tr>
 </tbody>
 </table>
-<h3><a class="anchor" aria-hidden="true" id="reduction-functions"></a><a href="#reduction-functions" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Reduction functions</h3>
+<h2><a class="anchor" aria-hidden="true" id="reduction-functions"></a><a href="#reduction-functions" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Reduction functions</h2>
 <p>Reduction functions operate on zero or more expressions and return a single expression. If no expressions are passed as
 arguments, then the result is <code>NULL</code>. The expressions must all be convertible to a common data type, which will be the
 type of the result:</p>
@@ -283,7 +285,19 @@
 <tr><td>ipv4_stringify(address)</td><td>Converts <code>address</code> into an IPv4 address dotted-decimal string. If <code>address</code> is a string that is a valid IPv4 address, then it is passed through. Returns null if <code>address</code> cannot be represented as an IPv4 address.</td></tr>
 </tbody>
 </table>
-</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/latest/querying/post-aggregations.html"><span class="arrow-prev">← </span><span>Post-aggregations</span></a><a class="docs-next button" href="/docs/latest/querying/having.html"><span class="function-name-prevnext">Having filters (groupBy)</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#general-functions">General functions</a></li><li><a href="#string-functions">String functions</a></li><li><a href="#time-functions">Time functions</a></li><li><a href="#math-functions">Math functions</a></li><li><a href="#array-functions">Array functions</a></li><li><a href="#apply-functions">Apply functions</a><ul class="toc-headings"><li><a href="#reduction-functions">Reduction functions</a></li></ul></li><li><a href="#ip-address-functions">IP address functions</a></li></ul></nav></div><footer class="nav-footer druid-footer" id="footer"><div class="container"><div class="text-center"><p><a href="/technology">Technology</a> · <a href="/use-cases">Use Cases</a> · <a href="/druid-powered">Powered by Druid</a> · <a href="/docs/latest/latest">Docs</a> · <a href="/community/">Community</a> · <a href="/downloads.html">Download</a> · <a href="/faq">FAQ</a></p></div><div class="text-center"><a title="Join the user group" href="https://groups.google.com/forum/#!forum/druid-user" target="_blank"><span class="fa fa-comments"></span></a> · <a title="Follow Druid" href="https://twitter.com/druidio" target="_blank"><span class="fab fa-twitter"></span></a> · <a title="Download via Apache" href="https://www.apache.org/dyn/closer.cgi?path=/incubator/druid/{{ site.druid_versions[0].versions[0].version }}/apache-druid-{{ site.druid_versions[0].versions[0].version }}-bin.tar.gz" target="_blank"><span class="fas fa-feather"></span></a> · <a title="GitHub" href="https://github.com/apache/druid" target="_blank"><span class="fab fa-github"></span></a></div><div class="text-center license">Copyright © 2019 <a href="https://www.apache.org/" target="_blank">Apache Software Foundation</a>.<br/>Except where otherwise noted, licensed under <a rel="license" href="http://creativecommons.org/licenses/by-sa/4.0/">CC BY-SA 4.0</a>.<br/>Apache Druid, Druid, and the Druid logo are either registered trademarks or trademarks of The Apache Software Foundation in the United States and other countries.</div></div></footer></div><script type="text/javascript" src="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.js"></script><script>
+<h2><a class="anchor" aria-hidden="true" id="vectorization-support"></a><a href="#vectorization-support" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Vectorization Support</h2>
+<p>A number of expressions support <a href="/docs/latest/querying/query-context.html#vectorization-parameters">'vectorized' query engines</a></p>
+<p>supported features:</p>
+<ul>
+<li>constants and identifiers are supported for any column type</li>
+<li><code>cast</code> is supported for numeric and string types</li>
+<li>math operators: <code>+</code>,<code>-</code>,<code>*</code>,<code>/</code>,<code>%</code>,<code>^</code> are supported for numeric types</li>
+<li>comparison operators: <code>=</code>, <code>!=</code>, <code>&gt;</code>, <code>&gt;=</code>, <code>&lt;</code>, <code>&lt;=</code> are supported for numeric types</li>
+<li>math functions: <code>abs</code>, <code>acos</code>, <code>asin</code>, <code>atan</code>, <code>cbrt</code>, <code>ceil</code>, <code>cos</code>, <code>cosh</code>, <code>cot</code>, <code>exp</code>, <code>expm1</code>, <code>floor</code>, <code>getExponent</code>, <code>log</code>, <code>log10</code>, <code>log1p</code>, <code>nextUp</code>, <code>rint</code>, <code>signum</code>, <code>sin</code>, <code>sinh</code>, <code>sqrt</code>, <code>tan</code>, <code>tanh</code>, <code>toDegrees</code>, <code>toRadians</code>, <code>ulp</code>, <code>atan2</code>, <code>copySign</code>, <code>div</code>, <code>hypot</code>, <code>max</code>, <code>min</code>, <code>nextAfter</code>,  <code>pow</code>, <code>remainder</code>, <code>scalb</code> are supported for numeric types</li>
+<li>time functions: <code>timestamp_floor</code> (with constant granularity argument) is supported for numeric types</li>
+<li>other: <code>parse_long</code> is supported for numeric and string types</li>
+</ul>
+</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/latest/querying/post-aggregations.html"><span class="arrow-prev">← </span><span>Post-aggregations</span></a><a class="docs-next button" href="/docs/latest/querying/having.html"><span class="function-name-prevnext">Having filters (groupBy)</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#general-functions">General functions</a></li><li><a href="#string-functions">String functions</a></li><li><a href="#time-functions">Time functions</a></li><li><a href="#math-functions">Math functions</a></li><li><a href="#array-functions">Array functions</a></li><li><a href="#apply-functions">Apply functions</a></li><li><a href="#reduction-functions">Reduction functions</a></li><li><a href="#ip-address-functions">IP address functions</a></li><li><a href="#vectorization-support">Vectorization Support</a></li></ul></nav></div><footer class="nav-footer druid-footer" id="footer"><div class="container"><div class="text-center"><p><a href="/technology">Technology</a> · <a href="/use-cases">Use Cases</a> · <a href="/druid-powered">Powered by Druid</a> · <a href="/docs/latest/latest">Docs</a> · <a href="/community/">Community</a> · <a href="/downloads.html">Download</a> · <a href="/faq">FAQ</a></p></div><div class="text-center"><a title="Join the user group" href="https://groups.google.com/forum/#!forum/druid-user" target="_blank"><span class="fa fa-comments"></span></a> · <a title="Follow Druid" href="https://twitter.com/druidio" target="_blank"><span class="fab fa-twitter"></span></a> · <a title="Download via Apache" href="https://www.apache.org/dyn/closer.cgi?path=/incubator/druid/{{ site.druid_versions[0].versions[0].version }}/apache-druid-{{ site.druid_versions[0].versions[0].version }}-bin.tar.gz" target="_blank"><span class="fas fa-feather"></span></a> · <a title="GitHub" href="https://github.com/apache/druid" target="_blank"><span class="fab fa-github"></span></a></div><div class="text-center license">Copyright © 2019 <a href="https://www.apache.org/" target="_blank">Apache Software Foundation</a>.<br/>Except where otherwise noted, licensed under <a rel="license" href="http://creativecommons.org/licenses/by-sa/4.0/">CC BY-SA 4.0</a>.<br/>Apache Druid, Druid, and the Druid logo are either registered trademarks or trademarks of The Apache Software Foundation in the United States and other countries.</div></div></footer></div><script type="text/javascript" src="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.js"></script><script>
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\ No newline at end of file
diff --git a/docs/latest/misc/papers-and-talks.html b/docs/latest/misc/papers-and-talks.html
index 400457d..5ed8be4 100644
--- a/docs/latest/misc/papers-and-talks.html
+++ b/docs/latest/misc/papers-and-talks.html
@@ -1,4 +1,4 @@
-<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Papers · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/misc/papers-and-talks.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.19.0" /><meta property="og:title" content="Papers · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Papers · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/misc/papers-and-talks.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.20.0" /><meta property="og:title" content="Papers · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
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diff --git a/docs/latest/operations/alerts.html b/docs/latest/operations/alerts.html
index 2ca8178..0b8e8f3 100644
--- a/docs/latest/operations/alerts.html
+++ b/docs/latest/operations/alerts.html
@@ -1,4 +1,4 @@
-<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Alerts · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/operations/alerts.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.19.0" /><meta property="og:title" content="Alerts · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Alerts · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/operations/alerts.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.20.0" /><meta property="og:title" content="Alerts · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
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diff --git a/docs/latest/operations/api-reference.html b/docs/latest/operations/api-reference.html
index 246f4b5..9c46416 100644
--- a/docs/latest/operations/api-reference.html
+++ b/docs/latest/operations/api-reference.html
@@ -1,4 +1,4 @@
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+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>API reference · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/operations/api-reference.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.20.0" /><meta property="og:title" content="API reference · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
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diff --git a/docs/latest/operations/basic-cluster-tuning.html b/docs/latest/operations/basic-cluster-tuning.html
index af0e2fb..812d89f 100644
--- a/docs/latest/operations/basic-cluster-tuning.html
+++ b/docs/latest/operations/basic-cluster-tuning.html
@@ -1,4 +1,4 @@
-<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Basic cluster tuning · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/operations/basic-cluster-tuning.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.19.0" /><meta property="og:title" content="Basic cluster tuning · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Basic cluster tuning · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/operations/basic-cluster-tuning.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.20.0" /><meta property="og:title" content="Basic cluster tuning · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
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@@ -116,12 +116,11 @@
 <p>For Historicals, <code>druid.server.http.numThreads</code> should be set to a value slightly higher than the sum of <code>druid.broker.http.numConnections</code> across all the Brokers in the cluster.</p>
 <p>Tuning the cluster so that each Historical can accept 50 queries and 10 non-queries is a reasonable starting point.</p>
 <h4><a class="anchor" aria-hidden="true" id="segment-cache-size"></a><a href="#segment-cache-size" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Segment Cache Size</h4>
-<p><code>druid.server.maxSize</code> controls the total size of segment data that can be assigned by the Coordinator to a Historical.</p>
-<p><code>druid.segmentCache.locations</code> specifies locations where segment data can be stored on the Historical. The sum of available disk space across these locations should equal <code>druid.server.maxSize</code>.</p>
+<p><code>druid.segmentCache.locations</code> specifies locations where segment data can be stored on the Historical. The sum of available disk space across these locations is set as the default value for property: <code>druid.server.maxSize</code>, which controls the total size of segment data that can be assigned by the Coordinator to a Historical.</p>
 <p>Segments are memory-mapped by Historical processes using any available free system memory (i.e., memory not used by the Historical JVM and heap/direct memory buffers or other processes on the system). Segments that are not currently in memory will be paged from disk when queried.</p>
-<p>Therefore, <code>druid.server.maxSize</code> should be set such that a Historical is not allocated an excessive amount of segment data. As the value of (<code>free system memory</code> / <code>druid.server.maxSize</code>) increases, a greater proportion of segments can be kept in memory, allowing for better query performance.</p>
+<p>Therefore, the size of cache locations set within <code>druid.segmentCache.locations</code> should be such that a Historical is not allocated an excessive amount of segment data. As the value of (<code>free system memory</code> / total size of all <code>druid.segmentCache.locations</code>) increases, a greater proportion of segments can be kept in memory, allowing for better query performance. The total segment data size assigned to a Historical can be overridden with <code>druid.server.maxSize</code>, but this is not required for most of the use cases.</p>
 <h4><a class="anchor" aria-hidden="true" id="number-of-historicals"></a><a href="#number-of-historicals" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Number of Historicals</h4>
-<p>The number of Historicals needed in a cluster depends on how much data the cluster has. For good performance, you will want enough Historicals such that each Historical has a good (<code>free system memory</code> / <code>druid.server.maxSize</code>) ratio, as described in the segment cache size section above.</p>
+<p>The number of Historicals needed in a cluster depends on how much data the cluster has. For good performance, you will want enough Historicals such that each Historical has a good (<code>free system memory</code> / total size of all <code>druid.segmentCache.locations</code>) ratio, as described in the segment cache size section above.</p>
 <p>Having a smaller number of big servers is generally better than having a large number of small servers, as long as you have enough fault tolerance for your use case.</p>
 <h4><a class="anchor" aria-hidden="true" id="ssd-storage"></a><a href="#ssd-storage" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>SSD storage</h4>
 <p>We recommend using SSDs for storage on the Historicals, as they handle segment data stored on disk.</p>
@@ -131,7 +130,7 @@
 <li>Heap: <code>(0.5GB * number of CPU cores) + (2 * total size of lookup maps) + druid.cache.sizeInBytes</code></li>
 <li>Direct Memory: <code>(druid.processing.numThreads + druid.processing.numMergeBuffers + 1) * druid.processing.buffer.sizeBytes</code></li>
 </ul>
-<p>The Historical will use any available free system memory (i.e., memory not used by the Historical JVM and heap/direct memory buffers or other processes on the system) for memory-mapping of segments on disk. For better query performance, you will want to ensure a good (<code>free system memory</code> / <code>druid.server.maxSize</code>) ratio so that a greater proportion of segments can be kept in memory.</p>
+<p>The Historical will use any available free system memory (i.e., memory not used by the Historical JVM and heap/direct memory buffers or other processes on the system) for memory-mapping of segments on disk. For better query performance, you will want to ensure a good (<code>free system memory</code> / total size of all <code>druid.segmentCache.locations</code>) ratio so that a greater proportion of segments can be kept in memory.</p>
 <h4><a class="anchor" aria-hidden="true" id="segment-sizes-matter"></a><a href="#segment-sizes-matter" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Segment sizes matter</h4>
 <p>Be sure to check out <a href="/docs/latest/operations/segment-optimization.html">segment size optimization</a> to help tune your Historical processes for maximum performance.</p>
 <h3><a class="anchor" aria-hidden="true" id="broker"></a><a href="#broker" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Broker</h3>
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diff --git a/docs/latest/operations/deep-storage-migration.html b/docs/latest/operations/deep-storage-migration.html
index 85eb548..084c89e 100644
--- a/docs/latest/operations/deep-storage-migration.html
+++ b/docs/latest/operations/deep-storage-migration.html
@@ -1,4 +1,4 @@
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+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Deep storage migration · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/operations/deep-storage-migration.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.20.0" /><meta property="og:title" content="Deep storage migration · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
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diff --git a/docs/latest/operations/druid-console.html b/docs/latest/operations/druid-console.html
index bb3bd97..54bff05 100644
--- a/docs/latest/operations/druid-console.html
+++ b/docs/latest/operations/druid-console.html
@@ -1,4 +1,4 @@
-<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Web console · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/operations/druid-console.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.19.0" /><meta property="og:title" content="Web console · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Web console · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/operations/druid-console.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.20.0" /><meta property="og:title" content="Web console · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
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diff --git a/docs/latest/operations/dump-segment.html b/docs/latest/operations/dump-segment.html
index 8fd4b91..f431de3 100644
--- a/docs/latest/operations/dump-segment.html
+++ b/docs/latest/operations/dump-segment.html
@@ -1,4 +1,4 @@
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diff --git a/docs/latest/operations/getting-started.html b/docs/latest/operations/getting-started.html
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\ No newline at end of file
diff --git a/docs/latest/operations/high-availability.html b/docs/latest/operations/high-availability.html
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\ No newline at end of file
diff --git a/docs/latest/operations/http-compression.html b/docs/latest/operations/http-compression.html
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\ No newline at end of file
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\ No newline at end of file
diff --git a/docs/latest/operations/kubernetes.html b/docs/latest/operations/kubernetes.html
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\ No newline at end of file
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@@ -1,4 +1,4 @@
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+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Legacy Management UIs · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/operations/management-uis.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.20.0" /><meta property="og:title" content="Legacy Management UIs · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
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\ No newline at end of file
diff --git a/docs/latest/operations/metadata-migration.html b/docs/latest/operations/metadata-migration.html
index a75f657..bc21dab 100644
--- a/docs/latest/operations/metadata-migration.html
+++ b/docs/latest/operations/metadata-migration.html
@@ -1,4 +1,4 @@
-<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Metadata Migration · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/operations/metadata-migration.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.19.0" /><meta property="og:title" content="Metadata Migration · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Metadata Migration · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/operations/metadata-migration.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.20.0" /><meta property="og:title" content="Metadata Migration · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
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diff --git a/docs/latest/operations/metrics.html b/docs/latest/operations/metrics.html
index 300ae98..26c3943 100644
--- a/docs/latest/operations/metrics.html
+++ b/docs/latest/operations/metrics.html
@@ -1,4 +1,4 @@
-<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Metrics · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/operations/metrics.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.19.0" /><meta property="og:title" content="Metrics · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Metrics · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/operations/metrics.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.20.0" /><meta property="og:title" content="Metrics · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
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@@ -216,6 +216,18 @@
 <tr><td><code>ingest/kafka/avgLag</code></td><td>Average lag between the offsets consumed by the Kafka indexing tasks and latest offsets in Kafka brokers across all partitions. Minimum emission period for this metric is a minute.</td><td>dataSource.</td><td>Greater than 0, should not be a very high number</td></tr>
 </tbody>
 </table>
+<h2><a class="anchor" aria-hidden="true" id="ingestion-metrics-kinesis-indexing-service"></a><a href="#ingestion-metrics-kinesis-indexing-service" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Ingestion Metrics (Kinesis Indexing Service)</h2>
+<p>These metrics are applicable for the Kinesis Indexing Service.</p>
+<table>
+<thead>
+<tr><th>Metric</th><th>Description</th><th>Dimensions</th><th>Normal Value</th></tr>
+</thead>
+<tbody>
+<tr><td><code>ingest/kinesis/lag/time</code></td><td>Total lag time in milliseconds between the current message sequence number consumed by the Kinesis indexing tasks and latest sequence number in Kinesis across all shards. Minimum emission period for this metric is a minute.</td><td>dataSource.</td><td>Greater than 0, up to max Kinesis retention period in milliseconds</td></tr>
+<tr><td><code>ingest/kinesis/maxLag/time</code></td><td>Max lag time in milliseconds between the current message sequence number consumed by the Kinesis indexing tasks and latest sequence number in Kinesis across all shards. Minimum emission period for this metric is a minute.</td><td>dataSource.</td><td>Greater than 0, up to max Kinesis retention period in milliseconds</td></tr>
+<tr><td><code>ingest/kinesis/avgLag/time</code></td><td>Average lag time in milliseconds between the current message sequence number consumed by the Kinesis indexing tasks and latest sequence number in Kinesis across all shards. Minimum emission period for this metric is a minute.</td><td>dataSource.</td><td>Greater than 0, up to max Kinesis retention period in milliseconds</td></tr>
+</tbody>
+</table>
 <h2><a class="anchor" aria-hidden="true" id="ingestion-metrics-realtime-process"></a><a href="#ingestion-metrics-realtime-process" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Ingestion metrics (Realtime process)</h2>
 <p>These metrics are only available if the RealtimeMetricsMonitor is included in the monitors list for the Realtime process. These metrics are deltas for each emission period.</p>
 <table>
@@ -259,6 +271,11 @@
 <tr><td><code>task/running/count</code></td><td>Number of current running tasks. This metric is only available if the TaskCountStatsMonitor module is included.</td><td>dataSource.</td><td>Varies.</td></tr>
 <tr><td><code>task/pending/count</code></td><td>Number of current pending tasks. This metric is only available if the TaskCountStatsMonitor module is included.</td><td>dataSource.</td><td>Varies.</td></tr>
 <tr><td><code>task/waiting/count</code></td><td>Number of current waiting tasks. This metric is only available if the TaskCountStatsMonitor module is included.</td><td>dataSource.</td><td>Varies.</td></tr>
+<tr><td><code>taskSlot/total/count</code></td><td>Number of total task slots per emission period. This metric is only available if the TaskSlotCountStatsMonitor module is included.</td><td></td><td>Varies.</td></tr>
+<tr><td><code>taskSlot/idle/count</code></td><td>Number of idle task slots per emission period. This metric is only available if the TaskSlotCountStatsMonitor module is included.</td><td></td><td>Varies.</td></tr>
+<tr><td><code>taskSlot/used/count</code></td><td>Number of busy task slots per emission period. This metric is only available if the TaskSlotCountStatsMonitor module is included.</td><td></td><td>Varies.</td></tr>
+<tr><td><code>taskSlot/lazy/count</code></td><td>Number of total task slots in lazy marked MiddleManagers and Indexers per emission period. This metric is only available if the TaskSlotCountStatsMonitor module is included.</td><td></td><td>Varies.</td></tr>
+<tr><td><code>taskSlot/blacklisted/count</code></td><td>Number of total task slots in blacklisted MiddleManagers and Indexers per emission period. This metric is only available if the TaskSlotCountStatsMonitor module is included.</td><td></td><td>Varies.</td></tr>
 </tbody>
 </table>
 <h2><a class="anchor" aria-hidden="true" id="coordination"></a><a href="#coordination" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Coordination</h2>
@@ -366,7 +383,7 @@
 <tr><td><code>sys/cpu</code></td><td>CPU used.</td><td>cpuName, cpuTime.</td><td>Varies.</td></tr>
 </tbody>
 </table>
-</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/latest/operations/rule-configuration.html"><span class="arrow-prev">← </span><span>Retaining or automatically dropping data</span></a><a class="docs-next button" href="/docs/latest/operations/alerts.html"><span>Alerts</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#available-metrics">Available Metrics</a></li><li><a href="#query-metrics">Query metrics</a><ul class="toc-headings"><li><a href="#broker">Broker</a></li><li><a href="#historical">Historical</a></li><li><a href="#real-time">Real-time</a></li><li><a href="#jetty">Jetty</a></li><li><a href="#cache">Cache</a></li></ul></li><li><a href="#sql-metrics">SQL Metrics</a></li><li><a href="#ingestion-metrics-kafka-indexing-service">Ingestion Metrics (Kafka Indexing Service)</a></li><li><a href="#ingestion-metrics-realtime-process">Ingestion metrics (Realtime process)</a><ul class="toc-headings"><li><a href="#indexing-service">Indexing service</a></li></ul></li><li><a href="#coordination">Coordination</a></li><li><a href="#general-health">General Health</a><ul class="toc-headings"><li><a href="#historical-1">Historical</a></li><li><a href="#jvm">JVM</a></li><li><a href="#eventreceiverfirehose">EventReceiverFirehose</a></li></ul></li><li><a href="#sys">Sys</a></li></ul></nav></div><footer class="nav-footer druid-footer" id="footer"><div class="container"><div class="text-center"><p><a href="/technology">Technology</a> · <a href="/use-cases">Use Cases</a> · <a href="/druid-powered">Powered by Druid</a> · <a href="/docs/latest/latest">Docs</a> · <a href="/community/">Community</a> · <a href="/downloads.html">Download</a> · <a href="/faq">FAQ</a></p></div><div class="text-center"><a title="Join the user group" href="https://groups.google.com/forum/#!forum/druid-user" target="_blank"><span class="fa fa-comments"></span></a> · <a title="Follow Druid" href="https://twitter.com/druidio" target="_blank"><span class="fab fa-twitter"></span></a> · <a title="Download via Apache" href="https://www.apache.org/dyn/closer.cgi?path=/incubator/druid/{{ site.druid_versions[0].versions[0].version }}/apache-druid-{{ site.druid_versions[0].versions[0].version }}-bin.tar.gz" target="_blank"><span class="fas fa-feather"></span></a> · <a title="GitHub" href="https://github.com/apache/druid" target="_blank"><span class="fab fa-github"></span></a></div><div class="text-center license">Copyright © 2019 <a href="https://www.apache.org/" target="_blank">Apache Software Foundation</a>.<br/>Except where otherwise noted, licensed under <a rel="license" href="http://creativecommons.org/licenses/by-sa/4.0/">CC BY-SA 4.0</a>.<br/>Apache Druid, Druid, and the Druid logo are either registered trademarks or trademarks of The Apache Software Foundation in the United States and other countries.</div></div></footer></div><script type="text/javascript" src="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.js"></script><script>
+</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/latest/operations/rule-configuration.html"><span class="arrow-prev">← </span><span>Retaining or automatically dropping data</span></a><a class="docs-next button" href="/docs/latest/operations/alerts.html"><span>Alerts</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#available-metrics">Available Metrics</a></li><li><a href="#query-metrics">Query metrics</a><ul class="toc-headings"><li><a href="#broker">Broker</a></li><li><a href="#historical">Historical</a></li><li><a href="#real-time">Real-time</a></li><li><a href="#jetty">Jetty</a></li><li><a href="#cache">Cache</a></li></ul></li><li><a href="#sql-metrics">SQL Metrics</a></li><li><a href="#ingestion-metrics-kafka-indexing-service">Ingestion Metrics (Kafka Indexing Service)</a></li><li><a href="#ingestion-metrics-kinesis-indexing-service">Ingestion Metrics (Kinesis Indexing Service)</a></li><li><a href="#ingestion-metrics-realtime-process">Ingestion metrics (Realtime process)</a><ul class="toc-headings"><li><a href="#indexing-service">Indexing service</a></li></ul></li><li><a href="#coordination">Coordination</a></li><li><a href="#general-health">General Health</a><ul class="toc-headings"><li><a href="#historical-1">Historical</a></li><li><a href="#jvm">JVM</a></li><li><a href="#eventreceiverfirehose">EventReceiverFirehose</a></li></ul></li><li><a href="#sys">Sys</a></li></ul></nav></div><footer class="nav-footer druid-footer" id="footer"><div class="container"><div class="text-center"><p><a href="/technology">Technology</a> · <a href="/use-cases">Use Cases</a> · <a href="/druid-powered">Powered by Druid</a> · <a href="/docs/latest/latest">Docs</a> · <a href="/community/">Community</a> · <a href="/downloads.html">Download</a> · <a href="/faq">FAQ</a></p></div><div class="text-center"><a title="Join the user group" href="https://groups.google.com/forum/#!forum/druid-user" target="_blank"><span class="fa fa-comments"></span></a> · <a title="Follow Druid" href="https://twitter.com/druidio" target="_blank"><span class="fab fa-twitter"></span></a> · <a title="Download via Apache" href="https://www.apache.org/dyn/closer.cgi?path=/incubator/druid/{{ site.druid_versions[0].versions[0].version }}/apache-druid-{{ site.druid_versions[0].versions[0].version }}-bin.tar.gz" target="_blank"><span class="fas fa-feather"></span></a> · <a title="GitHub" href="https://github.com/apache/druid" target="_blank"><span class="fab fa-github"></span></a></div><div class="text-center license">Copyright © 2019 <a href="https://www.apache.org/" target="_blank">Apache Software Foundation</a>.<br/>Except where otherwise noted, licensed under <a rel="license" href="http://creativecommons.org/licenses/by-sa/4.0/">CC BY-SA 4.0</a>.<br/>Apache Druid, Druid, and the Druid logo are either registered trademarks or trademarks of The Apache Software Foundation in the United States and other countries.</div></div></footer></div><script type="text/javascript" src="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.js"></script><script>
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+                algoliaOptions: {"facetFilters":["language:en","version:0.20.0"]}
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             </script></body></html>
\ No newline at end of file
diff --git a/docs/latest/operations/other-hadoop.html b/docs/latest/operations/other-hadoop.html
index e52fa84..c5de1e9 100644
--- a/docs/latest/operations/other-hadoop.html
+++ b/docs/latest/operations/other-hadoop.html
@@ -1,4 +1,4 @@
-<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Working with different versions of Apache Hadoop · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/operations/other-hadoop.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.19.0" /><meta property="og:title" content="Working with different versions of Apache Hadoop · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Working with different versions of Apache Hadoop · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/operations/other-hadoop.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.20.0" /><meta property="og:title" content="Working with different versions of Apache Hadoop · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
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+                algoliaOptions: {"facetFilters":["language:en","version:0.20.0"]}
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             </script></body></html>
\ No newline at end of file
diff --git a/docs/latest/operations/password-provider.html b/docs/latest/operations/password-provider.html
index 257fa1e..20abea1 100644
--- a/docs/latest/operations/password-provider.html
+++ b/docs/latest/operations/password-provider.html
@@ -1,4 +1,4 @@
-<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Password providers · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/operations/password-provider.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.19.0" /><meta property="og:title" content="Password providers · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Password providers · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/operations/password-provider.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.20.0" /><meta property="og:title" content="Password providers · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
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@@ -118,6 +118,6 @@
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+                algoliaOptions: {"facetFilters":["language:en","version:0.20.0"]}
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             </script></body></html>
\ No newline at end of file
diff --git a/docs/latest/operations/pull-deps.html b/docs/latest/operations/pull-deps.html
index da52ba3..209a1c3 100644
--- a/docs/latest/operations/pull-deps.html
+++ b/docs/latest/operations/pull-deps.html
@@ -1,4 +1,4 @@
-<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>pull-deps tool · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/operations/pull-deps.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.19.0" /><meta property="og:title" content="pull-deps tool · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>pull-deps tool · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/operations/pull-deps.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.20.0" /><meta property="og:title" content="pull-deps tool · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
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@@ -79,7 +79,7 @@
   -->
 <p><code>pull-deps</code> is an Apache Druid tool that can pull down dependencies to the local repository and lay dependencies out into the extension directory as needed.</p>
 <p><code>pull-deps</code> has several command line options, they are as follows:</p>
-<p><code>-c</code> or <code>--coordinate</code> (Can be specified multiply times)</p>
+<p><code>-c</code> or <code>--coordinate</code> (Can be specified multiple times)</p>
 <p>Extension coordinate to pull down, followed by a maven coordinate, e.g. org.apache.druid.extensions:mysql-metadata-storage</p>
 <p><code>-h</code> or <code>--hadoop-coordinate</code> (Can be specified multiply times)</p>
 <p>Apache Hadoop dependency to pull down, followed by a maven coordinate, e.g. org.apache.hadoop:hadoop-client:2.4.0</p>
@@ -94,7 +94,7 @@
 <p><code>--no-default-remote-repositories</code></p>
 <p>Don't use the default remote repositories, only use the repositories provided directly via --remoteRepository.</p>
 <p><code>-d</code> or <code>--defaultVersion</code></p>
-<p>Version to use for extension coordinate that doesn't have a version information. For example, if extension coordinate is <code>org.apache.druid.extensions:mysql-metadata-storage</code>, and default version is <code>0.19.0</code>, then this coordinate will be treated as <code>org.apache.druid.extensions:mysql-metadata-storage:0.19.0</code></p>
+<p>Version to use for extension coordinate that doesn't have a version information. For example, if extension coordinate is <code>org.apache.druid.extensions:mysql-metadata-storage</code>, and default version is <code>0.20.0</code>, then this coordinate will be treated as <code>org.apache.druid.extensions:mysql-metadata-storage:0.20.0</code></p>
 <p><code>--use-proxy</code></p>
 <p>Use http/https proxy to send request to the remote repository servers. <code>--proxy-host</code> and <code>--proxy-port</code> must be set explicitly if this option is enabled.</p>
 <p><code>--proxy-type</code></p>
@@ -113,14 +113,14 @@
 <li><p>Tell <code>pull-deps</code> what to download using <code>-c</code> or <code>-h</code> option, which are followed by a maven coordinate.</p></li>
 </ol>
 <p>Example:</p>
-<p>Suppose you want to download <code>mysql-metadata-storage</code> and <code>hadoop-client</code>(both 2.3.0 and 2.4.0) with a specific version, you can run <code>pull-deps</code> command with <code>-c org.apache.druid.extensions:mysql-metadata-storage:0.19.0</code>, <code>-h org.apache.hadoop:hadoop-client:2.3.0</code> and <code>-h org.apache.hadoop:hadoop-client:2.4.0</code>, an example command would be:</p>
-<pre><code class="hljs">java -classpath <span class="hljs-string">"/my/druid/lib/*"</span> org<span class="hljs-selector-class">.apache</span><span class="hljs-selector-class">.druid</span><span class="hljs-selector-class">.cli</span><span class="hljs-selector-class">.Main</span> tools pull-deps --clean -c org<span class="hljs-selector-class">.apache</span><span class="hljs-selector-class">.druid</span><span class="hljs-selector-class">.extensions</span>:mysql-metadata-storage:0.19.0 -h org<span class="hljs-selector-class">.apache</span><span class="hljs-selector-class">.hadoop</span>:hadoop-client:<span class="hljs-number">2.3</span>.<span class="hljs-number">0</span> -h org<span class="hljs-selector-class">.apache</span><span class="hljs-selector-class">.hadoop</span>:hadoop-client:<span class="hljs-number">2.4</span>.<span class="hljs-number">0</span>
+<p>Suppose you want to download <code>mysql-metadata-storage</code> and <code>hadoop-client</code>(both 2.3.0 and 2.4.0) with a specific version, you can run <code>pull-deps</code> command with <code>-c org.apache.druid.extensions:mysql-metadata-storage:0.20.0</code>, <code>-h org.apache.hadoop:hadoop-client:2.3.0</code> and <code>-h org.apache.hadoop:hadoop-client:2.4.0</code>, an example command would be:</p>
+<pre><code class="hljs">java -classpath <span class="hljs-string">"/my/druid/lib/*"</span> org<span class="hljs-selector-class">.apache</span><span class="hljs-selector-class">.druid</span><span class="hljs-selector-class">.cli</span><span class="hljs-selector-class">.Main</span> tools pull-deps --clean -c org<span class="hljs-selector-class">.apache</span><span class="hljs-selector-class">.druid</span><span class="hljs-selector-class">.extensions</span>:mysql-metadata-storage:0.20.0 -h org<span class="hljs-selector-class">.apache</span><span class="hljs-selector-class">.hadoop</span>:hadoop-client:<span class="hljs-number">2.3</span>.<span class="hljs-number">0</span> -h org<span class="hljs-selector-class">.apache</span><span class="hljs-selector-class">.hadoop</span>:hadoop-client:<span class="hljs-number">2.4</span>.<span class="hljs-number">0</span>
 </code></pre>
 <p>Because <code>--clean</code> is supplied, this command will first remove the directories specified at <code>druid.extensions.directory</code> and <code>druid.extensions.hadoopDependenciesDir</code>, then recreate them and start downloading the extensions there. After finishing downloading, if you go to the extension directories you specified, you will see</p>
 <pre><code class="hljs">tree <span class="hljs-keyword">extensions
 </span><span class="hljs-keyword">extensions
 </span>└── mysql-metadata-storage
-    └── mysql-metadata-storage-0.19.0.<span class="hljs-keyword">jar
+    └── mysql-metadata-storage-0.20.0.<span class="hljs-keyword">jar
 </span></code></pre>
 <pre><code class="hljs">tree hadoop-dependencies
 hadoop-dependencies/
@@ -142,8 +142,8 @@
         ├── commons-codec<span class="hljs-number">-1.4</span>.jar
     ..... lots of jars
 </code></pre>
-<p>Note that if you specify <code>--defaultVersion</code>, you don't have to put version information in the coordinate. For example, if you want <code>mysql-metadata-storage</code> to use version <code>0.19.0</code>,  you can change the command above to</p>
-<pre><code class="hljs">java -classpath <span class="hljs-string">"/my/druid/lib/*"</span> org<span class="hljs-selector-class">.apache</span><span class="hljs-selector-class">.druid</span><span class="hljs-selector-class">.cli</span><span class="hljs-selector-class">.Main</span> tools pull-deps --defaultVersion 0.19.0 --clean -c org<span class="hljs-selector-class">.apache</span><span class="hljs-selector-class">.druid</span><span class="hljs-selector-class">.extensions</span>:mysql-metadata-storage -h org<span class="hljs-selector-class">.apache</span><span class="hljs-selector-class">.hadoop</span>:hadoop-client:<span class="hljs-number">2.3</span>.<span class="hljs-number">0</span> -h org<span class="hljs-selector-class">.apache</span><span class="hljs-selector-class">.hadoop</span>:hadoop-client:<span class="hljs-number">2.4</span>.<span class="hljs-number">0</span>
+<p>Note that if you specify <code>--defaultVersion</code>, you don't have to put version information in the coordinate. For example, if you want <code>mysql-metadata-storage</code> to use version <code>0.20.0</code>,  you can change the command above to</p>
+<pre><code class="hljs">java -classpath <span class="hljs-string">"/my/druid/lib/*"</span> org<span class="hljs-selector-class">.apache</span><span class="hljs-selector-class">.druid</span><span class="hljs-selector-class">.cli</span><span class="hljs-selector-class">.Main</span> tools pull-deps --defaultVersion 0.20.0 --clean -c org<span class="hljs-selector-class">.apache</span><span class="hljs-selector-class">.druid</span><span class="hljs-selector-class">.extensions</span>:mysql-metadata-storage -h org<span class="hljs-selector-class">.apache</span><span class="hljs-selector-class">.hadoop</span>:hadoop-client:<span class="hljs-number">2.3</span>.<span class="hljs-number">0</span> -h org<span class="hljs-selector-class">.apache</span><span class="hljs-selector-class">.hadoop</span>:hadoop-client:<span class="hljs-number">2.4</span>.<span class="hljs-number">0</span>
 </code></pre>
 <blockquote>
 <p>Please note to use the pull-deps tool you must know the Maven groupId, artifactId, and version of your extension.</p>
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\ No newline at end of file
diff --git a/docs/latest/operations/reset-cluster.html b/docs/latest/operations/reset-cluster.html
index 19a55b6..6a758b3 100644
--- a/docs/latest/operations/reset-cluster.html
+++ b/docs/latest/operations/reset-cluster.html
@@ -1,4 +1,4 @@
-<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>reset-cluster tool · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/operations/reset-cluster.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.19.0" /><meta property="og:title" content="reset-cluster tool · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>reset-cluster tool · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/operations/reset-cluster.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.20.0" /><meta property="og:title" content="reset-cluster tool · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
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+                algoliaOptions: {"facetFilters":["language:en","version:0.20.0"]}
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\ No newline at end of file
diff --git a/docs/latest/operations/rolling-updates.html b/docs/latest/operations/rolling-updates.html
index 23278b9..202bd45 100644
--- a/docs/latest/operations/rolling-updates.html
+++ b/docs/latest/operations/rolling-updates.html
@@ -1,4 +1,4 @@
-<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Rolling updates · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/operations/rolling-updates.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.19.0" /><meta property="og:title" content="Rolling updates · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Rolling updates · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/operations/rolling-updates.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.20.0" /><meta property="og:title" content="Rolling updates · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
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@@ -148,6 +148,6 @@
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+                algoliaOptions: {"facetFilters":["language:en","version:0.20.0"]}
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             </script></body></html>
\ No newline at end of file
diff --git a/docs/latest/operations/rule-configuration.html b/docs/latest/operations/rule-configuration.html
index 8e3ab90..9b22721 100644
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diff --git a/docs/latest/operations/segment-optimization.html b/docs/latest/operations/segment-optimization.html
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--- a/docs/latest/operations/segment-optimization.html
+++ b/docs/latest/operations/segment-optimization.html
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+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Segment Size Optimization · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/operations/segment-optimization.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.20.0" /><meta property="og:title" content="Segment Size Optimization · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
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diff --git a/docs/latest/operations/single-server.html b/docs/latest/operations/single-server.html
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+++ b/docs/latest/operations/single-server.html
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+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Single server deployment · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/operations/single-server.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.20.0" /><meta property="og:title" content="Single server deployment · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
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diff --git a/docs/latest/operations/tls-support.html b/docs/latest/operations/tls-support.html
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+++ b/docs/latest/operations/tls-support.html
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\ No newline at end of file
diff --git a/docs/latest/operations/use_sbt_to_build_fat_jar.html b/docs/latest/operations/use_sbt_to_build_fat_jar.html
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+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Content for build.sbt · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/operations/use_sbt_to_build_fat_jar.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.20.0" /><meta property="og:title" content="Content for build.sbt · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
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\ No newline at end of file
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+++ b/docs/latest/querying/aggregations.html
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+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Aggregations · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/querying/aggregations.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.20.0" /><meta property="og:title" content="Aggregations · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
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\ No newline at end of file
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index 36bc85a..b5691e0 100644
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+++ b/docs/latest/querying/caching.html
@@ -1,4 +1,4 @@
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+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Query caching · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/querying/caching.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.20.0" /><meta property="og:title" content="Query caching · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
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diff --git a/docs/latest/querying/datasource.html b/docs/latest/querying/datasource.html
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+++ b/docs/latest/querying/datasource.html
@@ -1,4 +1,4 @@
-<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Datasources · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/querying/datasource.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.19.0" /><meta property="og:title" content="Datasources · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Datasources · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/querying/datasource.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.20.0" /><meta property="og:title" content="Datasources · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
               window.dataLayer = window.dataLayer || [];
               function gtag(){dataLayer.push(arguments); }
               gtag('js', new Date());
@@ -128,6 +128,8 @@
 <p>Union datasources allow you to treat two or more table datasources as a single datasource. The datasources being unioned
 do not need to have identical schemas. If they do not fully match up, then columns that exist in one table but not
 another will be treated as if they contained all null values in the tables where they do not exist.</p>
+<p>The list of &quot;dataSources&quot; must be nonempty. If you want to query an empty dataset, use an <a href="#inline"><code>inline</code> datasource</a>
+instead.</p>
 <p>Union datasources are not available in Druid SQL.</p>
 <p>Refer to the <a href="/docs/latest/querying/query-execution.html#union">Query execution</a> page for more details on how queries are executed when you
 use union datasources.</p>
@@ -167,7 +169,7 @@
 </span></div></div></div></div>
 <p>Join datasources allow you to do a SQL-style join of two datasources. Stacking joins on top of each other allows
 you to join arbitrarily many datasources.</p>
-<p>In Druid 0.19.0, joins are implemented with a broadcast hash-join algorithm. This means that all tables
+<p>In Druid 0.20.0, joins are implemented with a broadcast hash-join algorithm. This means that all tables
 other than the leftmost &quot;base&quot; table must fit in memory. It also means that the join condition must be an equality. This
 feature is intended mainly to allow joining regular Druid tables with <a href="#lookup">lookup</a>, <a href="#inline">inline</a>, and
 <a href="#query">query</a> datasources.</p>
@@ -218,7 +220,7 @@
 <li>One common reason for implicit subquery generation is if the types of the two halves of an equality do not match.
 For example, since lookup keys are always strings, the condition <code>druid.d JOIN lookup.l ON d.field = l.field</code> will
 perform best if <code>d.field</code> is a string.</li>
-<li>As of Druid 0.19.0, the join operator must evaluate the condition for each row. In the future, we expect
+<li>As of Druid 0.20.0, the join operator must evaluate the condition for each row. In the future, we expect
 to implement both early and deferred condition evaluation, which we expect to improve performance considerably for
 common use cases.</li>
 <li>Currently, Druid does not support pushing down predicates (condition and filter) past a Join (i.e. into
@@ -256,6 +258,6 @@
                 apiKey: '2de99082a9f38e49dfaa059bbe4c901d',
                 indexName: 'apache_druid',
                 inputSelector: '#search_input_react',
-                algoliaOptions: {"facetFilters":["language:en","version:0.19.0"]}
+                algoliaOptions: {"facetFilters":["language:en","version:0.20.0"]}
               });
             </script></body></html>
\ No newline at end of file
diff --git a/docs/latest/querying/datasourcemetadataquery.html b/docs/latest/querying/datasourcemetadataquery.html
index fb890a4..a3da773 100644
--- a/docs/latest/querying/datasourcemetadataquery.html
+++ b/docs/latest/querying/datasourcemetadataquery.html
@@ -1,4 +1,4 @@
-<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>DatasourceMetadata queries · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/querying/datasourcemetadataquery.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.19.0" /><meta property="og:title" content="DatasourceMetadata queries · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>DatasourceMetadata queries · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/querying/datasourcemetadataquery.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.20.0" /><meta property="og:title" content="DatasourceMetadata queries · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
               window.dataLayer = window.dataLayer || [];
               function gtag(){dataLayer.push(arguments); }
               gtag('js', new Date());
@@ -128,6 +128,6 @@
                 apiKey: '2de99082a9f38e49dfaa059bbe4c901d',
                 indexName: 'apache_druid',
                 inputSelector: '#search_input_react',
-                algoliaOptions: {"facetFilters":["language:en","version:0.19.0"]}
+                algoliaOptions: {"facetFilters":["language:en","version:0.20.0"]}
               });
             </script></body></html>
\ No newline at end of file
diff --git a/docs/latest/querying/dimensionspecs.html b/docs/latest/querying/dimensionspecs.html
index ae35fc7..70724f6 100644
--- a/docs/latest/querying/dimensionspecs.html
+++ b/docs/latest/querying/dimensionspecs.html
@@ -1,4 +1,4 @@
-<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Query dimensions · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/querying/dimensionspecs.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.19.0" /><meta property="og:title" content="Query dimensions · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Query dimensions · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/querying/dimensionspecs.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.20.0" /><meta property="og:title" content="Query dimensions · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
               window.dataLayer = window.dataLayer || [];
               function gtag(){dataLayer.push(arguments); }
               gtag('js', new Date());
@@ -469,6 +469,6 @@
                 apiKey: '2de99082a9f38e49dfaa059bbe4c901d',
                 indexName: 'apache_druid',
                 inputSelector: '#search_input_react',
-                algoliaOptions: {"facetFilters":["language:en","version:0.19.0"]}
+                algoliaOptions: {"facetFilters":["language:en","version:0.20.0"]}
               });
             </script></body></html>
\ No newline at end of file
diff --git a/docs/latest/querying/filters.html b/docs/latest/querying/filters.html
index 88d31d1..133ec46 100644
--- a/docs/latest/querying/filters.html
+++ b/docs/latest/querying/filters.html
@@ -1,4 +1,4 @@
-<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Query filters · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/querying/filters.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.19.0" /><meta property="og:title" content="Query filters · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Query filters · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/querying/filters.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.20.0" /><meta property="og:title" content="Query filters · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
               window.dataLayer = window.dataLayer || [];
               function gtag(){dataLayer.push(arguments); }
               gtag('js', new Date());
@@ -495,6 +495,6 @@
                 apiKey: '2de99082a9f38e49dfaa059bbe4c901d',
                 indexName: 'apache_druid',
                 inputSelector: '#search_input_react',
-                algoliaOptions: {"facetFilters":["language:en","version:0.19.0"]}
+                algoliaOptions: {"facetFilters":["language:en","version:0.20.0"]}
               });
             </script></body></html>
\ No newline at end of file
diff --git a/docs/latest/querying/granularities.html b/docs/latest/querying/granularities.html
index a65ac72..62b104f 100644
--- a/docs/latest/querying/granularities.html
+++ b/docs/latest/querying/granularities.html
@@ -1,4 +1,4 @@
-<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Query granularities · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/querying/granularities.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.19.0" /><meta property="og:title" content="Query granularities · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Query granularities · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/querying/granularities.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.20.0" /><meta property="og:title" content="Query granularities · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
               window.dataLayer = window.dataLayer || [];
               function gtag(){dataLayer.push(arguments); }
               gtag('js', new Date());
@@ -434,6 +434,6 @@
                 apiKey: '2de99082a9f38e49dfaa059bbe4c901d',
                 indexName: 'apache_druid',
                 inputSelector: '#search_input_react',
-                algoliaOptions: {"facetFilters":["language:en","version:0.19.0"]}
+                algoliaOptions: {"facetFilters":["language:en","version:0.20.0"]}
               });
             </script></body></html>
\ No newline at end of file
diff --git a/docs/latest/querying/groupbyquery.html b/docs/latest/querying/groupbyquery.html
index 200afef..fb72bba 100644
--- a/docs/latest/querying/groupbyquery.html
+++ b/docs/latest/querying/groupbyquery.html
@@ -1,4 +1,4 @@
-<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>GroupBy queries · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/querying/groupbyquery.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.19.0" /><meta property="og:title" content="GroupBy queries · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>GroupBy queries · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/querying/groupbyquery.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.20.0" /><meta property="og:title" content="GroupBy queries · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
               window.dataLayer = window.dataLayer || [];
               function gtag(){dataLayer.push(arguments); }
               gtag('js', new Date());
@@ -187,7 +187,8 @@
 improve performance.</p>
 <p>See <a href="multi-value-dimensions.html">Multi-value dimensions</a> for more details.</p>
 <h2><a class="anchor" aria-hidden="true" id="more-on-subtotalsspec"></a><a href="#more-on-subtotalsspec" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>More on subtotalsSpec</h2>
-<p>The subtotals feature allows computation of multiple sub-groupings in a single query. To use this feature, add a &quot;subtotalsSpec&quot; to your query, which should be a list of subgroup dimension sets. It should contain the &quot;outputName&quot; from dimensions in your &quot;dimensions&quot; attribute, in the same order as they appear in the &quot;dimensions&quot; attribute (although, of course, you may skip some). For example, consider a groupBy query like this one:</p>
+<p>The subtotals feature allows computation of multiple sub-groupings in a single query. To use this feature, add a &quot;subtotalsSpec&quot; to your query as a list of subgroup dimension sets. It should contain the <code>outputName</code> from dimensions in your <code>dimensions</code> attribute, in the same order as they appear in the <code>dimensions</code> attribute (although, of course, you may skip some).</p>
+<p>For example, consider a groupBy query like this one:</p>
 <pre><code class="hljs css language-json">{
 "type": "groupBy",
  ...
@@ -218,8 +219,8 @@
 
 }
 </code></pre>
-<p>Response returned would be equivalent to concatenating result of 3 groupBy queries with &quot;dimensions&quot; field being [&quot;D1&quot;, &quot;D2&quot;, D3&quot;], [&quot;D1&quot;, &quot;D3&quot;] and [&quot;D3&quot;] with appropriate <code>DimensionSpec</code> json blob as used in above query.
-Response for above query would look something like below...</p>
+<p>The result of the subtotalsSpec would be equivalent to concatenating the result of three groupBy queries, with the &quot;dimensions&quot; field being <code>[&quot;D1&quot;, &quot;D2&quot;, D3&quot;]</code>, <code>[&quot;D1&quot;, &quot;D3&quot;]</code> and <code>[&quot;D3&quot;]</code>, given the <code>DimensionSpec</code> shown above.
+The response for the query above would look something like:</p>
 <pre><code class="hljs css language-json">[
   {
     <span class="hljs-attr">"version"</span> : <span class="hljs-string">"v1"</span>,
@@ -239,13 +240,13 @@
    {
     <span class="hljs-attr">"version"</span> : <span class="hljs-string">"v1"</span>,
     <span class="hljs-attr">"timestamp"</span> : <span class="hljs-string">"t1"</span>,
-    <span class="hljs-attr">"event"</span> : { <span class="hljs-attr">"D1"</span>: <span class="hljs-string">".."</span>, <span class="hljs-attr">"D3"</span>: <span class="hljs-string">".."</span> }
+    <span class="hljs-attr">"event"</span> : { <span class="hljs-attr">"D1"</span>: <span class="hljs-string">".."</span>, <span class="hljs-attr">"D2"</span>: <span class="hljs-literal">null</span>, <span class="hljs-attr">"D3"</span>: <span class="hljs-string">".."</span> }
     }
   },
     {
     <span class="hljs-attr">"version"</span> : <span class="hljs-string">"v1"</span>,
     <span class="hljs-attr">"timestamp"</span> : <span class="hljs-string">"t2"</span>,
-    <span class="hljs-attr">"event"</span> : { <span class="hljs-attr">"D1"</span>: <span class="hljs-string">".."</span>, <span class="hljs-attr">"D3"</span>: <span class="hljs-string">".."</span> }
+    <span class="hljs-attr">"event"</span> : { <span class="hljs-attr">"D1"</span>: <span class="hljs-string">".."</span>, <span class="hljs-attr">"D2"</span>: <span class="hljs-literal">null</span>, <span class="hljs-attr">"D3"</span>: <span class="hljs-string">".."</span> }
     }
   },
   ...
@@ -254,18 +255,21 @@
   {
     <span class="hljs-attr">"version"</span> : <span class="hljs-string">"v1"</span>,
     <span class="hljs-attr">"timestamp"</span> : <span class="hljs-string">"t1"</span>,
-    <span class="hljs-attr">"event"</span> : { <span class="hljs-attr">"D3"</span>: <span class="hljs-string">".."</span> }
+    <span class="hljs-attr">"event"</span> : { <span class="hljs-attr">"D1"</span>: <span class="hljs-literal">null</span>, <span class="hljs-attr">"D2"</span>: <span class="hljs-literal">null</span>, <span class="hljs-attr">"D3"</span>: <span class="hljs-string">".."</span> }
     }
   },
     {
     <span class="hljs-attr">"version"</span> : <span class="hljs-string">"v1"</span>,
     <span class="hljs-attr">"timestamp"</span> : <span class="hljs-string">"t2"</span>,
-    <span class="hljs-attr">"event"</span> : { <span class="hljs-attr">"D3"</span>: <span class="hljs-string">".."</span> }
+    <span class="hljs-attr">"event"</span> : { <span class="hljs-attr">"D1"</span>: <span class="hljs-literal">null</span>, <span class="hljs-attr">"D2"</span>: <span class="hljs-literal">null</span>, <span class="hljs-attr">"D3"</span>: <span class="hljs-string">".."</span> }
     }
   },
 ...
 ]
 </code></pre>
+<blockquote>
+<p>Notice that dimensions that are not included in an individual subtotalsSpec grouping are returned with a <code>null</code> value. This response format represents a behavior change as of Apache Druid 0.18.0. In release 0.17.0 and earlier, such dimensions were entirely excluded from the result.</p>
+</blockquote>
 <h2><a class="anchor" aria-hidden="true" id="implementation-details"></a><a href="#implementation-details" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Implementation details</h2>
 <h3><a class="anchor" aria-hidden="true" id="strategies"></a><a href="#strategies" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Strategies</h3>
 <p>GroupBy queries can be executed using two different strategies. The default strategy for a cluster is determined by the
@@ -504,6 +508,6 @@
                 apiKey: '2de99082a9f38e49dfaa059bbe4c901d',
                 indexName: 'apache_druid',
                 inputSelector: '#search_input_react',
-                algoliaOptions: {"facetFilters":["language:en","version:0.19.0"]}
+                algoliaOptions: {"facetFilters":["language:en","version:0.20.0"]}
               });
             </script></body></html>
\ No newline at end of file
diff --git a/docs/latest/querying/having.html b/docs/latest/querying/having.html
index 88056fa..4e54d09 100644
--- a/docs/latest/querying/having.html
+++ b/docs/latest/querying/having.html
@@ -1,4 +1,4 @@
-<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Having filters (groupBy) · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/querying/having.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.19.0" /><meta property="og:title" content="Having filters (groupBy) · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Having filters (groupBy) · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/querying/having.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.20.0" /><meta property="og:title" content="Having filters (groupBy) · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
               window.dataLayer = window.dataLayer || [];
               function gtag(){dataLayer.push(arguments); }
               gtag('js', new Date());
@@ -282,6 +282,6 @@
                 apiKey: '2de99082a9f38e49dfaa059bbe4c901d',
                 indexName: 'apache_druid',
                 inputSelector: '#search_input_react',
-                algoliaOptions: {"facetFilters":["language:en","version:0.19.0"]}
+                algoliaOptions: {"facetFilters":["language:en","version:0.20.0"]}
               });
             </script></body></html>
\ No newline at end of file
diff --git a/docs/latest/querying/hll-old.html b/docs/latest/querying/hll-old.html
index 158bca1..d16fd91 100644
--- a/docs/latest/querying/hll-old.html
+++ b/docs/latest/querying/hll-old.html
@@ -1,4 +1,4 @@
-<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Cardinality/HyperUnique aggregators · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/querying/hll-old.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.19.0" /><meta property="og:title" content="Cardinality/HyperUnique aggregators · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Cardinality/HyperUnique aggregators · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/querying/hll-old.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.20.0" /><meta property="og:title" content="Cardinality/HyperUnique aggregators · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
               window.dataLayer = window.dataLayer || [];
               function gtag(){dataLayer.push(arguments); }
               gtag('js', new Date());
@@ -180,6 +180,6 @@
                 apiKey: '2de99082a9f38e49dfaa059bbe4c901d',
                 indexName: 'apache_druid',
                 inputSelector: '#search_input_react',
-                algoliaOptions: {"facetFilters":["language:en","version:0.19.0"]}
+                algoliaOptions: {"facetFilters":["language:en","version:0.20.0"]}
               });
             </script></body></html>
\ No newline at end of file
diff --git a/docs/latest/querying/joins.html b/docs/latest/querying/joins.html
index f7a8fe4..4b1fa42 100644
--- a/docs/latest/querying/joins.html
+++ b/docs/latest/querying/joins.html
@@ -1,4 +1,4 @@
-<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Joins · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/querying/joins.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.19.0" /><meta property="og:title" content="Joins · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Joins · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/querying/joins.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.20.0" /><meta property="og:title" content="Joins · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
               window.dataLayer = window.dataLayer || [];
               function gtag(){dataLayer.push(arguments); }
               gtag('js', new Date());
@@ -111,6 +111,6 @@
                 apiKey: '2de99082a9f38e49dfaa059bbe4c901d',
                 indexName: 'apache_druid',
                 inputSelector: '#search_input_react',
-                algoliaOptions: {"facetFilters":["language:en","version:0.19.0"]}
+                algoliaOptions: {"facetFilters":["language:en","version:0.20.0"]}
               });
             </script></body></html>
\ No newline at end of file
diff --git a/docs/latest/querying/limitspec.html b/docs/latest/querying/limitspec.html
index 605059a..d6b2651 100644
--- a/docs/latest/querying/limitspec.html
+++ b/docs/latest/querying/limitspec.html
@@ -1,4 +1,4 @@
-<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Sorting and limiting (groupBy) · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/querying/limitspec.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.19.0" /><meta property="og:title" content="Sorting and limiting (groupBy) · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Sorting and limiting (groupBy) · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/querying/limitspec.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.20.0" /><meta property="og:title" content="Sorting and limiting (groupBy) · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
               window.dataLayer = window.dataLayer || [];
               function gtag(){dataLayer.push(arguments); }
               gtag('js', new Date());
@@ -87,10 +87,20 @@
 <p>The default limit spec takes a limit and the list of columns to do an orderBy operation over. The grammar is:</p>
 <pre><code class="hljs css language-json">{
     <span class="hljs-attr">"type"</span>    : <span class="hljs-string">"default"</span>,
-    <span class="hljs-attr">"limit"</span>   : &lt;integer_value&gt;,
-    <span class="hljs-attr">"columns"</span> : [list of OrderByColumnSpec],
+    <span class="hljs-attr">"limit"</span>   : &lt;optional integer&gt;,
+    <span class="hljs-attr">"offset"</span>  : &lt;optional integer&gt;,
+    <span class="hljs-attr">"columns"</span> : [&lt;optional list of OrderByColumnSpec&gt;],
 }
 </code></pre>
+<p>The &quot;limit&quot; parameter is the maximum number of rows to return.</p>
+<p>The &quot;offset&quot; parameter tells Druid to skip this many rows when returning results. If both &quot;limit&quot; and &quot;offset&quot; are
+provided, then &quot;offset&quot; will be applied first, followed by &quot;limit&quot;. For example, a spec with limit 100 and offset 10
+will return 100 rows starting from row number 10. Internally, the query is executed by extending the limit by the offset
+and then discarding a number of rows equal to the offset. This means that raising the offset will increase resource
+usage by an amount similar to increasing the limit.</p>
+<p>Together, &quot;limit&quot; and &quot;offset&quot; can be used to implement pagination. However, note that if the underlying datasource is
+modified in between page fetches in ways that affect overall query results, then the different pages will not
+necessarily align with each other.</p>
 <h4><a class="anchor" aria-hidden="true" id="orderbycolumnspec"></a><a href="#orderbycolumnspec" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>OrderByColumnSpec</h4>
 <p>OrderByColumnSpecs indicate how to do order by operations. Each order-by condition can be a <code>jsonString</code> or a map of the following form:</p>
 <pre><code class="hljs css language-json">{
@@ -118,6 +128,6 @@
                 apiKey: '2de99082a9f38e49dfaa059bbe4c901d',
                 indexName: 'apache_druid',
                 inputSelector: '#search_input_react',
-                algoliaOptions: {"facetFilters":["language:en","version:0.19.0"]}
+                algoliaOptions: {"facetFilters":["language:en","version:0.20.0"]}
               });
             </script></body></html>
\ No newline at end of file
diff --git a/docs/latest/querying/lookups.html b/docs/latest/querying/lookups.html
index 9dcc80d..15eb3a9 100644
--- a/docs/latest/querying/lookups.html
+++ b/docs/latest/querying/lookups.html
@@ -1,4 +1,4 @@
-<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Lookups · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/querying/lookups.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.19.0" /><meta property="og:title" content="Lookups · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Lookups · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/querying/lookups.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.20.0" /><meta property="og:title" content="Lookups · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
               window.dataLayer = window.dataLayer || [];
               function gtag(){dataLayer.push(arguments); }
               gtag('js', new Date());
@@ -333,7 +333,7 @@
 <h3><a class="anchor" aria-hidden="true" id="list-load-status-of-single-lookup"></a><a href="#list-load-status-of-single-lookup" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>List load status of single lookup</h3>
 <p><code>GET /druid/coordinator/v1/lookups/status/{tier}/{lookup}</code> with optional query parameter <code>detailed</code>.</p>
 <h3><a class="anchor" aria-hidden="true" id="list-lookup-state-of-all-processes"></a><a href="#list-lookup-state-of-all-processes" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>List lookup state of all processes</h3>
-<p><code>GET /druid/coordinator/v1/lookups/nodeStatus</code> with optional query parameter <code>discover</code> to discover tiers or configured lookup tiers are listed.</p>
+<p><code>GET /druid/coordinator/v1/lookups/nodeStatus</code> with optional query parameter <code>discover</code> to discover tiers advertised by other Druid nodes, or by default, returning all configured lookup tiers. The default response will also include the lookups which are loaded, being loaded, or being dropped on each node, for each tier, including the complete lookup spec. Add the optional query parameter <code>detailed=false</code> to only include the 'version' of the lookup instead of the complete spec.</p>
 <h3><a class="anchor" aria-hidden="true" id="list-lookup-state-of-processes-in-a-tier"></a><a href="#list-lookup-state-of-processes-in-a-tier" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>List lookup state of processes in a tier</h3>
 <p><code>GET /druid/coordinator/v1/lookups/nodeStatus/{tier}</code></p>
 <h3><a class="anchor" aria-hidden="true" id="list-lookup-state-of-single-process"></a><a href="#list-lookup-state-of-single-process" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>List lookup state of single process</h3>
@@ -470,6 +470,6 @@
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                 indexName: 'apache_druid',
                 inputSelector: '#search_input_react',
-                algoliaOptions: {"facetFilters":["language:en","version:0.19.0"]}
+                algoliaOptions: {"facetFilters":["language:en","version:0.20.0"]}
               });
             </script></body></html>
\ No newline at end of file
diff --git a/docs/latest/querying/multi-value-dimensions.html b/docs/latest/querying/multi-value-dimensions.html
index 5d099dd..5cf2051 100644
--- a/docs/latest/querying/multi-value-dimensions.html
+++ b/docs/latest/querying/multi-value-dimensions.html
@@ -1,4 +1,4 @@
-<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Multi-value dimensions · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/querying/multi-value-dimensions.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.19.0" /><meta property="og:title" content="Multi-value dimensions · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Multi-value dimensions · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/querying/multi-value-dimensions.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.20.0" /><meta property="og:title" content="Multi-value dimensions · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
               window.dataLayer = window.dataLayer || [];
               function gtag(){dataLayer.push(arguments); }
               gtag('js', new Date());
@@ -376,6 +376,6 @@
                 apiKey: '2de99082a9f38e49dfaa059bbe4c901d',
                 indexName: 'apache_druid',
                 inputSelector: '#search_input_react',
-                algoliaOptions: {"facetFilters":["language:en","version:0.19.0"]}
+                algoliaOptions: {"facetFilters":["language:en","version:0.20.0"]}
               });
             </script></body></html>
\ No newline at end of file
diff --git a/docs/latest/querying/multitenancy.html b/docs/latest/querying/multitenancy.html
index e83d1be..059f132 100644
--- a/docs/latest/querying/multitenancy.html
+++ b/docs/latest/querying/multitenancy.html
@@ -1,4 +1,4 @@
-<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Multitenancy considerations · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/querying/multitenancy.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.19.0" /><meta property="og:title" content="Multitenancy considerations · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Multitenancy considerations · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/querying/multitenancy.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.20.0" /><meta property="og:title" content="Multitenancy considerations · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
               window.dataLayer = window.dataLayer || [];
               function gtag(){dataLayer.push(arguments); }
               gtag('js', new Date());
@@ -148,6 +148,6 @@
                 apiKey: '2de99082a9f38e49dfaa059bbe4c901d',
                 indexName: 'apache_druid',
                 inputSelector: '#search_input_react',
-                algoliaOptions: {"facetFilters":["language:en","version:0.19.0"]}
+                algoliaOptions: {"facetFilters":["language:en","version:0.20.0"]}
               });
             </script></body></html>
\ No newline at end of file
diff --git a/docs/latest/querying/post-aggregations.html b/docs/latest/querying/post-aggregations.html
index a5fe176..f18b9cc 100644
--- a/docs/latest/querying/post-aggregations.html
+++ b/docs/latest/querying/post-aggregations.html
@@ -1,4 +1,4 @@
-<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Post-aggregations · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/querying/post-aggregations.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.19.0" /><meta property="og:title" content="Post-aggregations · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Post-aggregations · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/querying/post-aggregations.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.20.0" /><meta property="og:title" content="Post-aggregations · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
               window.dataLayer = window.dataLayer || [];
               function gtag(){dataLayer.push(arguments); }
               gtag('js', new Date());
@@ -247,6 +247,6 @@
                 apiKey: '2de99082a9f38e49dfaa059bbe4c901d',
                 indexName: 'apache_druid',
                 inputSelector: '#search_input_react',
-                algoliaOptions: {"facetFilters":["language:en","version:0.19.0"]}
+                algoliaOptions: {"facetFilters":["language:en","version:0.20.0"]}
               });
             </script></body></html>
\ No newline at end of file
diff --git a/docs/latest/querying/query-context.html b/docs/latest/querying/query-context.html
index c484788..5caed7a 100644
--- a/docs/latest/querying/query-context.html
+++ b/docs/latest/querying/query-context.html
@@ -1,4 +1,4 @@
-<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Query context · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/querying/query-context.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.19.0" /><meta property="og:title" content="Query context · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Query context · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/querying/query-context.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.20.0" /><meta property="og:title" content="Query context · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
               window.dataLayer = window.dataLayer || [];
               function gtag(){dataLayer.push(arguments); }
               gtag('js', new Date());
@@ -85,6 +85,8 @@
 HTTP POST API, or as properties to the JDBC connection.</li>
 <li>For <a href="/docs/latest/querying/querying.html">native queries</a>, context parameters are provided as a JSON object named <code>context</code>.</li>
 </ul>
+<p>Note that setting query context will override both the default value and the runtime properties value in the format of
+<code>druid.query.default.context.{property_key}</code> (if set).</p>
 <p>These parameters apply to all query types.</p>
 <table>
 <thead>
@@ -110,6 +112,7 @@
 <tr><td>parallelMergeInitialYieldRows</td><td><code>druid.processing.merge.task.initialYieldNumRows</code></td><td>Number of rows to yield per ForkJoinPool merge task for parallel result merging on the Broker, before forking off a new task to continue merging sequences. See <a href="../configuration/index.html#broker">Broker configuration</a> for more details.</td></tr>
 <tr><td>parallelMergeSmallBatchRows</td><td><code>druid.processing.merge.task.smallBatchNumRows</code></td><td>Size of result batches to operate on in ForkJoinPool merge tasks for parallel result merging on the Broker. See <a href="../configuration/index.html#broker">Broker configuration</a> for more details.</td></tr>
 <tr><td>useFilterCNF</td><td><code>false</code></td><td>If true, Druid will attempt to convert the query filter to Conjunctive Normal Form (CNF). During query processing, columns can be pre-filtered by intersecting the bitmap indexes of all values that match the eligible filters, often greatly reducing the raw number of rows which need to be scanned. But this effect only happens for the top level filter, or individual clauses of a top level 'and' filter. As such, filters in CNF potentially have a higher chance to utilize a large amount of bitmap indexes on string columns during pre-filtering. However, this setting should be used with great caution, as it can sometimes have a negative effect on performance, and in some cases, the act of computing CNF of a filter can be expensive. We recommend hand tuning your filters to produce an optimal form if possible, or at least verifying through experimentation that using this parameter actually improves your query performance with no ill-effects.</td></tr>
+<tr><td>secondaryPartitionPruning</td><td><code>true</code></td><td>Enable secondary partition pruning on the Broker. The Broker will always prune unnecessary segments from the input scan based on a filter on time intervals, but if the data is further partitioned with hash or range partitioning, this option will enable additional pruning based on a filter on secondary partition dimensions.</td></tr>
 </tbody>
 </table>
 <h2><a class="anchor" aria-hidden="true" id="query-type-specific-parameters"></a><a href="#query-type-specific-parameters" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Query-type-specific parameters</h2>
@@ -143,9 +146,10 @@
 <li>All query-level filters must either be able to run on bitmap indexes or must offer vectorized row-matchers. These
 include &quot;selector&quot;, &quot;bound&quot;, &quot;in&quot;, &quot;like&quot;, &quot;regex&quot;, &quot;search&quot;, &quot;and&quot;, &quot;or&quot;, and &quot;not&quot;.</li>
 <li>All filters in filtered aggregators must offer vectorized row-matchers.</li>
-<li>All aggregators must offer vectorized implementations. These include &quot;count&quot;, &quot;doubleSum&quot;, &quot;floatSum&quot;, &quot;longSum&quot;,
-&quot;hyperUnique&quot;, and &quot;filtered&quot;.</li>
-<li>No virtual columns.</li>
+<li>All aggregators must offer vectorized implementations. These include &quot;count&quot;, &quot;doubleSum&quot;, &quot;floatSum&quot;, &quot;longSum&quot;, &quot;longMin&quot;,
+&quot;longMax&quot;, &quot;doubleMin&quot;, &quot;doubleMax&quot;, &quot;floatMin&quot;, &quot;floatMax&quot;, &quot;longAny&quot;, &quot;doubleAny&quot;, &quot;floatAny&quot;, &quot;stringAny&quot;,
+&quot;hyperUnique&quot;, &quot;filtered&quot;, &quot;approxHistogram&quot;, &quot;approxHistogramFold&quot;, and &quot;fixedBucketsHistogram&quot; (with numerical input).</li>
+<li>All virtual columns must offer vectorized implementations. Currently for expression virtual columns, support for vectorization is decided on a per expression basis, depending on the type of input and the functions used by the expression. See the currently supported list in the <a href="/docs/latest/misc/math-expr.html#vectorization-support">expression documentation</a>.</li>
 <li>For GroupBy: All dimension specs must be &quot;default&quot; (no extraction functions or filtered dimension specs).</li>
 <li>For GroupBy: No multi-value dimensions.</li>
 <li>For Timeseries: No &quot;descending&quot; order.</li>
@@ -159,8 +163,9 @@
 <tr><th>property</th><th>default</th><th>description</th></tr>
 </thead>
 <tbody>
-<tr><td>vectorize</td><td><code>true</code></td><td>Enables or disables vectorized query execution. Possible values are <code>false</code> (disabled), <code>true</code> (enabled if possible, disabled otherwise, on a per-segment basis), and <code>force</code> (enabled, and groupBy or timeseries queries that cannot be vectorized will fail). The <code>&quot;force&quot;</code> setting is meant to aid in testing, and is not generally useful in production (since real-time segments can never be processed with vectorized execution, any queries on real-time data will fail). This will override <code>druid.query.vectorize</code> if it's set.</td></tr>
-<tr><td>vectorSize</td><td><code>512</code></td><td>Sets the row batching size for a particular query. This will override <code>druid.query.vectorSize</code> if it's set.</td></tr>
+<tr><td>vectorize</td><td><code>true</code></td><td>Enables or disables vectorized query execution. Possible values are <code>false</code> (disabled), <code>true</code> (enabled if possible, disabled otherwise, on a per-segment basis), and <code>force</code> (enabled, and groupBy or timeseries queries that cannot be vectorized will fail). The <code>&quot;force&quot;</code> setting is meant to aid in testing, and is not generally useful in production (since real-time segments can never be processed with vectorized execution, any queries on real-time data will fail). This will override <code>druid.query.default.context.vectorize</code> if it's set.</td></tr>
+<tr><td>vectorSize</td><td><code>512</code></td><td>Sets the row batching size for a particular query. This will override <code>druid.query.default.context.vectorSize</code> if it's set.</td></tr>
+<tr><td>vectorizeVirtualColumns</td><td><code>false</code></td><td>Enables or disables vectorized query processing of queries with virtual columns, layered on top of <code>vectorize</code> (<code>vectorize</code> must also be set to true for a query to utilize vectorization). Possible values are <code>false</code> (disabled), <code>true</code> (enabled if possible, disabled otherwise, on a per-segment basis), and <code>force</code> (enabled, and groupBy or timeseries queries with virtual columns that cannot be vectorized will fail). The <code>&quot;force&quot;</code> setting is meant to aid in testing, and is not generally useful in production. This will override <code>druid.query.default.context.vectorizeVirtualColumns</code> if it's set.</td></tr>
 </tbody>
 </table>
 </span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/latest/querying/caching.html"><span class="arrow-prev">← </span><span>Query caching</span></a><a class="docs-next button" href="/docs/latest/querying/timeseriesquery.html"><span>Timeseries</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#general-parameters">General parameters</a></li><li><a href="#query-type-specific-parameters">Query-type-specific parameters</a><ul class="toc-headings"><li><a href="#topn">TopN</a></li><li><a href="#timeseries">Timeseries</a></li><li><a href="#groupby">GroupBy</a></li></ul></li><li><a href="#vectorization-parameters">Vectorization parameters</a></li></ul></nav></div><footer class="nav-footer druid-footer" id="footer"><div class="container"><div class="text-center"><p><a href="/technology">Technology</a> · <a href="/use-cases">Use Cases</a> · <a href="/druid-powered">Powered by Druid</a> · <a href="/docs/latest/latest">Docs</a> · <a href="/community/">Community</a> · <a href="/downloads.html">Download</a> · <a href="/faq">FAQ</a></p></div><div class="text-center"><a title="Join the user group" href="https://groups.google.com/forum/#!forum/druid-user" target="_blank"><span class="fa fa-comments"></span></a> · <a title="Follow Druid" href="https://twitter.com/druidio" target="_blank"><span class="fab fa-twitter"></span></a> · <a title="Download via Apache" href="https://www.apache.org/dyn/closer.cgi?path=/incubator/druid/{{ site.druid_versions[0].versions[0].version }}/apache-druid-{{ site.druid_versions[0].versions[0].version }}-bin.tar.gz" target="_blank"><span class="fas fa-feather"></span></a> · <a title="GitHub" href="https://github.com/apache/druid" target="_blank"><span class="fab fa-github"></span></a></div><div class="text-center license">Copyright © 2019 <a href="https://www.apache.org/" target="_blank">Apache Software Foundation</a>.<br/>Except where otherwise noted, licensed under <a rel="license" href="http://creativecommons.org/licenses/by-sa/4.0/">CC BY-SA 4.0</a>.<br/>Apache Druid, Druid, and the Druid logo are either registered trademarks or trademarks of The Apache Software Foundation in the United States and other countries.</div></div></footer></div><script type="text/javascript" src="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.js"></script><script>
@@ -180,6 +185,6 @@
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                 indexName: 'apache_druid',
                 inputSelector: '#search_input_react',
-                algoliaOptions: {"facetFilters":["language:en","version:0.19.0"]}
+                algoliaOptions: {"facetFilters":["language:en","version:0.20.0"]}
               });
             </script></body></html>
\ No newline at end of file
diff --git a/docs/latest/querying/query-execution.html b/docs/latest/querying/query-execution.html
index fc499d0..40a12fe 100644
--- a/docs/latest/querying/query-execution.html
+++ b/docs/latest/querying/query-execution.html
@@ -1,4 +1,4 @@
-<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Query execution · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/querying/query-execution.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.19.0" /><meta property="og:title" content="Query execution · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Query execution · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/querying/query-execution.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.20.0" /><meta property="og:title" content="Query execution · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
               window.dataLayer = window.dataLayer || [];
               function gtag(){dataLayer.push(arguments); }
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@@ -166,6 +166,6 @@
                 apiKey: '2de99082a9f38e49dfaa059bbe4c901d',
                 indexName: 'apache_druid',
                 inputSelector: '#search_input_react',
-                algoliaOptions: {"facetFilters":["language:en","version:0.19.0"]}
+                algoliaOptions: {"facetFilters":["language:en","version:0.20.0"]}
               });
             </script></body></html>
\ No newline at end of file
diff --git a/docs/latest/querying/querying.html b/docs/latest/querying/querying.html
index 1747824..98aa887 100644
--- a/docs/latest/querying/querying.html
+++ b/docs/latest/querying/querying.html
@@ -1,4 +1,4 @@
-<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Native queries · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/querying/querying.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.19.0" /><meta property="og:title" content="Native queries · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Native queries · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/querying/querying.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.20.0" /><meta property="og:title" content="Native queries · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
               window.dataLayer = window.dataLayer || [];
               function gtag(){dataLayer.push(arguments); }
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@@ -194,6 +194,6 @@
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                 indexName: 'apache_druid',
                 inputSelector: '#search_input_react',
-                algoliaOptions: {"facetFilters":["language:en","version:0.19.0"]}
+                algoliaOptions: {"facetFilters":["language:en","version:0.20.0"]}
               });
             </script></body></html>
\ No newline at end of file
diff --git a/docs/latest/querying/scan-query.html b/docs/latest/querying/scan-query.html
index d2e9c47..01c08ab 100644
--- a/docs/latest/querying/scan-query.html
+++ b/docs/latest/querying/scan-query.html
@@ -1,4 +1,4 @@
-<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Scan queries · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/querying/scan-query.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.19.0" /><meta property="og:title" content="Scan queries · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Scan queries · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/querying/scan-query.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.20.0" /><meta property="og:title" content="Scan queries · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
               window.dataLayer = window.dataLayer || [];
               function gtag(){dataLayer.push(arguments); }
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@@ -114,6 +114,7 @@
 <tr><td>columns</td><td>A String array of dimensions and metrics to scan. If left empty, all dimensions and metrics are returned.</td><td>no</td></tr>
 <tr><td>batchSize</td><td>The maximum number of rows buffered before being returned to the client. Default is <code>20480</code></td><td>no</td></tr>
 <tr><td>limit</td><td>How many rows to return. If not specified, all rows will be returned.</td><td>no</td></tr>
+<tr><td>offset</td><td>Skip this many rows when returning results. Skipped rows will still need to be generated internally and then discarded, meaning that raising offsets to high values can cause queries to use additional resources.<br /><br />Together, &quot;limit&quot; and &quot;offset&quot; can be used to implement pagination. However, note that if the underlying datasource is modified in between page fetches in ways that affect overall query results, then the different pages will not necessarily align with each other.</td><td>no</td></tr>
 <tr><td>order</td><td>The ordering of returned rows based on timestamp.  &quot;ascending&quot;, &quot;descending&quot;, and &quot;none&quot; (default) are supported.  Currently, &quot;ascending&quot; and &quot;descending&quot; are only supported for queries where the <code>__time</code> column is included in the <code>columns</code> field and the requirements outlined in the <a href="#time-ordering">time ordering</a> section are met.</td><td>none</td></tr>
 <tr><td>legacy</td><td>Return results consistent with the legacy &quot;scan-query&quot; contrib extension. Defaults to the value set by <code>druid.query.scan.legacy</code>, which in turn defaults to false. See <a href="#legacy-mode">Legacy mode</a> for details.</td><td>no</td></tr>
 <tr><td>context</td><td>An additional JSON Object which can be used to specify certain flags (see the <code>query context properties</code> section below).</td><td>no</td></tr>
@@ -285,6 +286,6 @@
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+                algoliaOptions: {"facetFilters":["language:en","version:0.20.0"]}
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             </script></body></html>
\ No newline at end of file
diff --git a/docs/latest/querying/searchquery.html b/docs/latest/querying/searchquery.html
index 44fc7bd..9037747 100644
--- a/docs/latest/querying/searchquery.html
+++ b/docs/latest/querying/searchquery.html
@@ -1,4 +1,4 @@
-<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Search queries · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/querying/searchquery.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.19.0" /><meta property="og:title" content="Search queries · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Search queries · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/querying/searchquery.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.20.0" /><meta property="og:title" content="Search queries · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
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@@ -243,6 +243,6 @@
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+                algoliaOptions: {"facetFilters":["language:en","version:0.20.0"]}
               });
             </script></body></html>
\ No newline at end of file
diff --git a/docs/latest/querying/segmentmetadataquery.html b/docs/latest/querying/segmentmetadataquery.html
index 352465f..9e32056 100644
--- a/docs/latest/querying/segmentmetadataquery.html
+++ b/docs/latest/querying/segmentmetadataquery.html
@@ -1,4 +1,4 @@
-<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>SegmentMetadata queries · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/querying/segmentmetadataquery.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.19.0" /><meta property="og:title" content="SegmentMetadata queries · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>SegmentMetadata queries · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/querying/segmentmetadataquery.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.20.0" /><meta property="og:title" content="SegmentMetadata queries · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
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               function gtag(){dataLayer.push(arguments); }
               gtag('js', new Date());
@@ -85,15 +85,19 @@
 </blockquote>
 <p>Segment metadata queries return per-segment information about:</p>
 <ul>
-<li>Cardinality of all columns in the segment</li>
-<li>Min/max values of string type columns in the segment</li>
-<li>Estimated byte size for the segment columns if they were stored in a flat format</li>
 <li>Number of rows stored inside the segment</li>
 <li>Interval the segment covers</li>
-<li>Column type of all the columns in the segment</li>
-<li>Estimated total segment byte size in if it was stored in a flat format</li>
-<li>Is the segment rolled up</li>
+<li>Estimated total segment byte size in if it was stored in a 'flat format' (e.g. a csv file)</li>
 <li>Segment id</li>
+<li>Is the segment rolled up</li>
+<li>Detailed per column information such as:
+<ul>
+<li>type</li>
+<li>cardinality</li>
+<li>min/max values</li>
+<li>presence of null values</li>
+<li>estimated 'flat format' byte size</li>
+</ul></li>
 </ul>
 <pre><code class="hljs css language-json">{
   <span class="hljs-attr">"queryType"</span>:<span class="hljs-string">"segmentMetadata"</span>,
@@ -122,10 +126,10 @@
   <span class="hljs-attr">"id"</span> : <span class="hljs-string">"some_id"</span>,
   <span class="hljs-attr">"intervals"</span> : [ <span class="hljs-string">"2013-05-13T00:00:00.000Z/2013-05-14T00:00:00.000Z"</span> ],
   <span class="hljs-attr">"columns"</span> : {
-    <span class="hljs-attr">"__time"</span> : { <span class="hljs-attr">"type"</span> : <span class="hljs-string">"LONG"</span>, <span class="hljs-attr">"hasMultipleValues"</span> : <span class="hljs-literal">false</span>, <span class="hljs-attr">"size"</span> : <span class="hljs-number">407240380</span>, <span class="hljs-attr">"cardinality"</span> : <span class="hljs-literal">null</span>, <span class="hljs-attr">"errorMessage"</span> : <span class="hljs-literal">null</span> },
-    <span class="hljs-attr">"dim1"</span> : { <span class="hljs-attr">"type"</span> : <span class="hljs-string">"STRING"</span>, <span class="hljs-attr">"hasMultipleValues"</span> : <span class="hljs-literal">false</span>, <span class="hljs-attr">"size"</span> : <span class="hljs-number">100000</span>, <span class="hljs-attr">"cardinality"</span> : <span class="hljs-number">1944</span>, <span class="hljs-attr">"errorMessage"</span> : <span class="hljs-literal">null</span> },
-    <span class="hljs-attr">"dim2"</span> : { <span class="hljs-attr">"type"</span> : <span class="hljs-string">"STRING"</span>, <span class="hljs-attr">"hasMultipleValues"</span> : <span class="hljs-literal">true</span>, <span class="hljs-attr">"size"</span> : <span class="hljs-number">100000</span>, <span class="hljs-attr">"cardinality"</span> : <span class="hljs-number">1504</span>, <span class="hljs-attr">"errorMessage"</span> : <span class="hljs-literal">null</span> },
-    <span class="hljs-attr">"metric1"</span> : { <span class="hljs-attr">"type"</span> : <span class="hljs-string">"FLOAT"</span>, <span class="hljs-attr">"hasMultipleValues"</span> : <span class="hljs-literal">false</span>, <span class="hljs-attr">"size"</span> : <span class="hljs-number">100000</span>, <span class="hljs-attr">"cardinality"</span> : <span class="hljs-literal">null</span>, <span class="hljs-attr">"errorMessage"</span> : <span class="hljs-literal">null</span> }
+    <span class="hljs-attr">"__time"</span> : { <span class="hljs-attr">"type"</span> : <span class="hljs-string">"LONG"</span>, <span class="hljs-attr">"hasMultipleValues"</span> : <span class="hljs-literal">false</span>, <span class="hljs-attr">"hasNulls"</span>: <span class="hljs-literal">false</span>, <span class="hljs-attr">"size"</span> : <span class="hljs-number">407240380</span>, <span class="hljs-attr">"cardinality"</span> : <span class="hljs-literal">null</span>, <span class="hljs-attr">"errorMessage"</span> : <span class="hljs-literal">null</span> },
+    <span class="hljs-attr">"dim1"</span> : { <span class="hljs-attr">"type"</span> : <span class="hljs-string">"STRING"</span>, <span class="hljs-attr">"hasMultipleValues"</span> : <span class="hljs-literal">false</span>, <span class="hljs-attr">"hasNulls"</span>: <span class="hljs-literal">false</span>, <span class="hljs-attr">"size"</span> : <span class="hljs-number">100000</span>, <span class="hljs-attr">"cardinality"</span> : <span class="hljs-number">1944</span>, <span class="hljs-attr">"errorMessage"</span> : <span class="hljs-literal">null</span> },
+    <span class="hljs-attr">"dim2"</span> : { <span class="hljs-attr">"type"</span> : <span class="hljs-string">"STRING"</span>, <span class="hljs-attr">"hasMultipleValues"</span> : <span class="hljs-literal">true</span>, <span class="hljs-attr">"hasNulls"</span>: <span class="hljs-literal">true</span>, <span class="hljs-attr">"size"</span> : <span class="hljs-number">100000</span>, <span class="hljs-attr">"cardinality"</span> : <span class="hljs-number">1504</span>, <span class="hljs-attr">"errorMessage"</span> : <span class="hljs-literal">null</span> },
+    <span class="hljs-attr">"metric1"</span> : { <span class="hljs-attr">"type"</span> : <span class="hljs-string">"FLOAT"</span>, <span class="hljs-attr">"hasMultipleValues"</span> : <span class="hljs-literal">false</span>, <span class="hljs-attr">"hasNulls"</span>: <span class="hljs-literal">false</span>, <span class="hljs-attr">"size"</span> : <span class="hljs-number">100000</span>, <span class="hljs-attr">"cardinality"</span> : <span class="hljs-literal">null</span>, <span class="hljs-attr">"errorMessage"</span> : <span class="hljs-literal">null</span> }
   },
   <span class="hljs-attr">"aggregators"</span> : {
     <span class="hljs-attr">"metric1"</span> : { <span class="hljs-attr">"type"</span> : <span class="hljs-string">"longSum"</span>, <span class="hljs-attr">"name"</span> : <span class="hljs-string">"metric1"</span>, <span class="hljs-attr">"fieldName"</span> : <span class="hljs-string">"metric1"</span> }
@@ -137,12 +141,12 @@
   <span class="hljs-attr">"numRows"</span> : <span class="hljs-number">5000000</span>
 } ]
 </code></pre>
-<p>Dimension columns will have type <code>STRING</code>.
-Metric columns will have type <code>FLOAT</code> or <code>LONG</code> or name of the underlying complex type such as <code>hyperUnique</code> in case of COMPLEX metric.
+<p>Dimension columns will have type <code>STRING</code>, <code>FLOAT</code>, <code>DOUBLE</code>, or <code>LONG</code>.
+Metric columns will have type <code>FLOAT</code>, <code>DOUBLE</code>, or <code>LONG</code>, or the name of the underlying complex type such as <code>hyperUnique</code> in case of COMPLEX metric.
 Timestamp column will have type <code>LONG</code>.</p>
 <p>If the <code>errorMessage</code> field is non-null, you should not trust the other fields in the response. Their contents are
 undefined.</p>
-<p>Only columns which are dimensions (i.e., have type <code>STRING</code>) will have any cardinality. Rest of the columns (timestamp and metric columns) will show cardinality as <code>null</code>.</p>
+<p>Only columns which are dictionary encoded (i.e., have type <code>STRING</code>) will have any cardinality. Rest of the columns (timestamp and metric columns) will show cardinality as <code>null</code>.</p>
 <h2><a class="anchor" aria-hidden="true" id="intervals"></a><a href="#intervals" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>intervals</h2>
 <p>If an interval is not specified, the query will use a default interval that spans a configurable period before the end time of the most recent segment.</p>
 <p>The length of this default time period is set in the Broker configuration via:
@@ -230,6 +234,6 @@
                 apiKey: '2de99082a9f38e49dfaa059bbe4c901d',
                 indexName: 'apache_druid',
                 inputSelector: '#search_input_react',
-                algoliaOptions: {"facetFilters":["language:en","version:0.19.0"]}
+                algoliaOptions: {"facetFilters":["language:en","version:0.20.0"]}
               });
             </script></body></html>
\ No newline at end of file
diff --git a/docs/latest/querying/select-query.html b/docs/latest/querying/select-query.html
index 698919e..dc73bec 100644
--- a/docs/latest/querying/select-query.html
+++ b/docs/latest/querying/select-query.html
@@ -1,4 +1,4 @@
-<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Select queries · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/querying/select-query.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.19.0" /><meta property="og:title" content="Select queries · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Select queries · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/querying/select-query.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.20.0" /><meta property="og:title" content="Select queries · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
               window.dataLayer = window.dataLayer || [];
               function gtag(){dataLayer.push(arguments); }
               gtag('js', new Date());
@@ -78,7 +78,6 @@
   ~ under the License.
   -->
 <p>Older versions of Apache Druid included a Select query type. Since Druid 0.17.0, it has been removed and replaced by the <a href="/docs/latest/querying/scan-query.html">Scan query</a>, which offers improved memory usage and performance. This solves issues that users had with Select queries causing Druid to run out of memory or slow down.</p>
-<p>The Scan query has a different syntax, but supports many of the features of the Select query, including time ordering and limiting. Scan does not include the Select query's pagination feature; however, in many cases pagination is unnecessary with Scan due to its ability to return a virtually unlimited number of results in one call.</p>
 </span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/latest/querying/hll-old.html"><span class="arrow-prev">← </span><span class="function-name-prevnext">Cardinality/HyperUnique aggregators</span></a><a class="docs-next button" href="/docs/latest/ingestion/standalone-realtime.html"><span>Realtime Process</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"></nav></div><footer class="nav-footer druid-footer" id="footer"><div class="container"><div class="text-center"><p><a href="/technology">Technology</a> · <a href="/use-cases">Use Cases</a> · <a href="/druid-powered">Powered by Druid</a> · <a href="/docs/latest/latest">Docs</a> · <a href="/community/">Community</a> · <a href="/downloads.html">Download</a> · <a href="/faq">FAQ</a></p></div><div class="text-center"><a title="Join the user group" href="https://groups.google.com/forum/#!forum/druid-user" target="_blank"><span class="fa fa-comments"></span></a> · <a title="Follow Druid" href="https://twitter.com/druidio" target="_blank"><span class="fab fa-twitter"></span></a> · <a title="Download via Apache" href="https://www.apache.org/dyn/closer.cgi?path=/incubator/druid/{{ site.druid_versions[0].versions[0].version }}/apache-druid-{{ site.druid_versions[0].versions[0].version }}-bin.tar.gz" target="_blank"><span class="fas fa-feather"></span></a> · <a title="GitHub" href="https://github.com/apache/druid" target="_blank"><span class="fab fa-github"></span></a></div><div class="text-center license">Copyright © 2019 <a href="https://www.apache.org/" target="_blank">Apache Software Foundation</a>.<br/>Except where otherwise noted, licensed under <a rel="license" href="http://creativecommons.org/licenses/by-sa/4.0/">CC BY-SA 4.0</a>.<br/>Apache Druid, Druid, and the Druid logo are either registered trademarks or trademarks of The Apache Software Foundation in the United States and other countries.</div></div></footer></div><script type="text/javascript" src="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.js"></script><script>
                 document.addEventListener('keyup', function(e) {
                   if (e.target !== document.body) {
@@ -96,6 +95,6 @@
                 apiKey: '2de99082a9f38e49dfaa059bbe4c901d',
                 indexName: 'apache_druid',
                 inputSelector: '#search_input_react',
-                algoliaOptions: {"facetFilters":["language:en","version:0.19.0"]}
+                algoliaOptions: {"facetFilters":["language:en","version:0.20.0"]}
               });
             </script></body></html>
\ No newline at end of file
diff --git a/docs/latest/querying/sorting-orders.html b/docs/latest/querying/sorting-orders.html
index d69438a..85ccd6b 100644
--- a/docs/latest/querying/sorting-orders.html
+++ b/docs/latest/querying/sorting-orders.html
@@ -1,4 +1,4 @@
-<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>String comparators · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/querying/sorting-orders.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.19.0" /><meta property="og:title" content="String comparators · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>String comparators · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/querying/sorting-orders.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.20.0" /><meta property="og:title" content="String comparators · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
               window.dataLayer = window.dataLayer || [];
               function gtag(){dataLayer.push(arguments); }
               gtag('js', new Date());
@@ -120,6 +120,6 @@
                 apiKey: '2de99082a9f38e49dfaa059bbe4c901d',
                 indexName: 'apache_druid',
                 inputSelector: '#search_input_react',
-                algoliaOptions: {"facetFilters":["language:en","version:0.19.0"]}
+                algoliaOptions: {"facetFilters":["language:en","version:0.20.0"]}
               });
             </script></body></html>
\ No newline at end of file
diff --git a/docs/latest/querying/sql.html b/docs/latest/querying/sql.html
index c90a293..4aeeef0 100644
--- a/docs/latest/querying/sql.html
+++ b/docs/latest/querying/sql.html
@@ -1,4 +1,4 @@
-<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>SQL · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/querying/sql.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.19.0" /><meta property="og:title" content="SQL · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>SQL · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/querying/sql.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.20.0" /><meta property="og:title" content="SQL · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
               window.dataLayer = window.dataLayer || [];
               function gtag(){dataLayer.push(arguments); }
               gtag('js', new Date());
@@ -103,6 +103,7 @@
 [ <span class="hljs-keyword">HAVING</span> expr ]
 [ <span class="hljs-keyword">ORDER</span> <span class="hljs-keyword">BY</span> expr [ <span class="hljs-keyword">ASC</span> | <span class="hljs-keyword">DESC</span> ], expr [ <span class="hljs-keyword">ASC</span> | <span class="hljs-keyword">DESC</span> ], ... ]
 [ <span class="hljs-keyword">LIMIT</span> <span class="hljs-keyword">limit</span> ]
+[ <span class="hljs-keyword">OFFSET</span> <span class="hljs-keyword">offset</span> ]
 [ <span class="hljs-keyword">UNION</span> <span class="hljs-keyword">ALL</span> &lt;another <span class="hljs-keyword">query</span>&gt; ]
 </code></pre>
 <h3><a class="anchor" aria-hidden="true" id="from"></a><a href="#from" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>FROM</h3>
@@ -153,17 +154,59 @@
 ordinal position (like <code>ORDER BY 2</code> to order by the second selected column). For non-aggregation queries, ORDER BY
 can only order by the <code>__time</code> column. For aggregation queries, ORDER BY can order by any column.</p>
 <h3><a class="anchor" aria-hidden="true" id="limit"></a><a href="#limit" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>LIMIT</h3>
-<p>The LIMIT clause can be used to limit the number of rows returned. It can be used with any query type. It is pushed down
-to Data processes for queries that run with the native TopN query type, but not the native GroupBy query type. Future
-versions of Druid will support pushing down limits using the native GroupBy query type as well. If you notice that
-adding a limit doesn't change performance very much, then it's likely that Druid didn't push down the limit for your
-query.</p>
+<p>The LIMIT clause limits the number of rows returned. In some situations Druid will push down this limit to data servers,
+which boosts performance. Limits are always pushed down for queries that run with the native Scan or TopN query types.
+With the native GroupBy query type, it is pushed down when ordering on a column that you are grouping by. If you notice
+that adding a limit doesn't change performance very much, then it's possible that Druid wasn't able to push down the
+limit for your query.</p>
+<h3><a class="anchor" aria-hidden="true" id="offset"></a><a href="#offset" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>OFFSET</h3>
+<p>The OFFSET clause skips a certain number of rows when returning results.</p>
+<p>If both LIMIT and OFFSET are provided, then OFFSET will be applied first, followed by LIMIT. For example, using
+LIMIT 100 OFFSET 10 will return 100 rows, starting from row number 10.</p>
+<p>Together, LIMIT and OFFSET can be used to implement pagination. However, note that if the underlying datasource is
+modified between page fetches, then the different pages will not necessarily align with each other.</p>
+<p>There are two important factors that can affect the performance of queries that use OFFSET:</p>
+<ul>
+<li>Skipped rows still need to be generated internally and then discarded, meaning that raising offsets to high values
+can cause queries to use additional resources.</li>
+<li>OFFSET is only supported by the Scan and GroupBy <a href="#query-types">native query types</a>. Therefore, a query with OFFSET
+will use one of those two types, even if it might otherwise have run as a Timeseries or TopN. Switching query engines
+in this way can affect performance.</li>
+</ul>
 <h3><a class="anchor" aria-hidden="true" id="union-all"></a><a href="#union-all" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>UNION ALL</h3>
-<p>The &quot;UNION ALL&quot; operator can be used to fuse multiple queries together. Their results will be concatenated, and each
-query will run separately, back to back (not in parallel). Druid does not currently support &quot;UNION&quot; without &quot;ALL&quot;.
-UNION ALL must appear at the very outer layer of a SQL query (it cannot appear in a subquery or in the FROM clause).</p>
-<p>Note that despite the similar name, UNION ALL is not the same thing as as <a href="/docs/latest/querying/datasource.html#union">union datasource</a>.
-UNION ALL allows unioning the results of queries, whereas union datasources allow unioning tables.</p>
+<p>The &quot;UNION ALL&quot; operator fuses multiple queries together. Druid SQL supports the UNION ALL operator in two situations:
+top-level and table-level. Queries that use UNION ALL in any other way will not be able to execute.</p>
+<h4><a class="anchor" aria-hidden="true" id="top-level"></a><a href="#top-level" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Top-level</h4>
+<p>UNION ALL can be used at the very top outer layer of a SQL query (not in a subquery, and not in the FROM clause). In
+this case, the underlying queries will be run separately, back to back, and their results will all be returned in
+one result set.</p>
+<p>For example:</p>
+<pre><code class="hljs"><span class="hljs-keyword">SELECT</span> COUNT<span class="hljs-comment">(*) FROM tbl WHERE my_column = 'value1'
+UNION ALL
+SELECT COUNT(*)</span> <span class="hljs-keyword">FROM</span> tbl <span class="hljs-keyword">WHERE</span> my_column = <span class="hljs-string">'value2'</span>
+</code></pre>
+<p>When UNION ALL occurs at the top level of a query like this, the results from the unioned queries are concatenated
+together and appear one after the other.</p>
+<h4><a class="anchor" aria-hidden="true" id="table-level"></a><a href="#table-level" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Table-level</h4>
+<p>UNION ALL can be used to query multiple tables at the same time. In this case, it must appear in the FROM clause,
+and the subqueries that are inputs to the UNION ALL operator must be simple table SELECTs (no expressions, column
+aliasing, etc). The query will run natively using a <a href="/docs/latest/querying/datasource.html#union">union datasource</a>.</p>
+<p>The same columns must be selected from each table in the same order, and those columns must either have the same types,
+or types that can be implicitly cast to each other (such as different numeric types). For this reason, it is generally
+more robust to write your queries to select specific columns. If you use <code>SELECT *</code>, you will need to modify your
+queries if a new column is added to one of the tables but not to the others.</p>
+<p>For example:</p>
+<pre><code class="hljs">SELECT col1, COUNT(*)
+<span class="hljs-keyword">FROM</span> (
+  SELECT col1, col2, col3 <span class="hljs-keyword">FROM</span> tbl1
+  UNION ALL
+  SELECT col1, col2, col3 <span class="hljs-keyword">FROM</span> tbl2
+)<span class="hljs-built_in">
+GROUP </span>BY col1
+</code></pre>
+<p>When UNION ALL occurs at the table level, the rows from the unioned tables are not guaranteed to be processed in
+any particular order. They may be processed in an interleaved fashion. If you need a particular result ordering,
+use <a href="#order-by">ORDER BY</a>.</p>
 <h3><a class="anchor" aria-hidden="true" id="explain-plan"></a><a href="#explain-plan" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>EXPLAIN PLAN</h3>
 <p>Add &quot;EXPLAIN PLAN FOR&quot; to the beginning of any query to get information about how it will be translated. In this case,
 the query will not actually be executed. Refer to the <a href="#query-translation">Query translation</a> documentation for help
@@ -227,6 +270,14 @@
 <p>Grouping by a multi-value expression will observe the native Druid multi-value aggregation behavior, which is similar to
 the <code>UNNEST</code> functionality available in some other SQL dialects. Refer to the documentation on
 <a href="multi-value-dimensions.html">multi-value string dimensions</a> for additional details.</p>
+<blockquote>
+<p>Because multi-value dimensions are treated by the SQL planner as <code>VARCHAR</code>, there are some inconsistencies between how
+they are handled in Druid SQL and in native queries. For example, expressions involving multi-value dimensions may be
+incorrectly optimized by the Druid SQL planner: <code>multi_val_dim = 'a' AND multi_val_dim = 'b'</code> will be optimized to
+<code>false</code>, even though it is possible for a single row to have both &quot;a&quot; and &quot;b&quot; as values for <code>multi_val_dim</code>. The
+SQL behavior of multi-value dimensions will change in a future release to more closely align with their behavior
+in native queries.</p>
+</blockquote>
 <h3><a class="anchor" aria-hidden="true" id="null-values"></a><a href="#null-values" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>NULL values</h3>
 <p>The <code>druid.generic.useDefaultValueForNull</code> <a href="../configuration/index.html#sql-compatible-null-handling">runtime property</a>
 controls Druid's NULL handling mode.</p>
@@ -245,6 +296,13 @@
 <code>AGG(expr) FILTER(WHERE whereExpr)</code>. Filtered aggregators will only aggregate rows that match their filter. It's
 possible for two aggregators in the same SQL query to have different filters.</p>
 <p>Only the COUNT aggregation can accept DISTINCT.</p>
+<blockquote>
+<p>The order of aggregation operations across segments is not deterministic. This means that non-commutative aggregation
+functions can produce inconsistent results across the same query.</p>
+<p>Functions that operate on an input type of &quot;float&quot; or &quot;double&quot; may also see these differences in aggregation
+results across multiple query runs because of this. If precisely the same value is desired across multiple query runs,
+consider using the <code>ROUND</code> function to smooth out the inconsistencies between queries.</p>
+</blockquote>
 <table>
 <thead>
 <tr><th>Function</th><th>Notes</th></tr>
@@ -342,6 +400,8 @@
 <tr><td><code>POSITION(needle IN haystack [FROM fromIndex])</code></td><td>Returns the index of needle within haystack, with indexes starting from 1. The search will begin at fromIndex, or 1 if fromIndex is not specified. If the needle is not found, returns 0.</td></tr>
 <tr><td><code>REGEXP_EXTRACT(expr, pattern, [index])</code></td><td>Apply regular expression <code>pattern</code> to <code>expr</code> and extract a capture group, or <code>NULL</code> if there is no match. If index is unspecified or zero, returns the first substring that matched the pattern. The pattern may match anywhere inside <code>expr</code>; if you want to match the entire string instead, use the <code>^</code> and <code>$</code> markers at the start and end of your pattern. Note: when <code>druid.generic.useDefaultValueForNull = true</code>, it is not possible to differentiate an empty-string match from a non-match (both will return <code>NULL</code>).</td></tr>
 <tr><td><code>REGEXP_LIKE(expr, pattern)</code></td><td>Returns whether <code>expr</code> matches regular expression <code>pattern</code>. The pattern may match anywhere inside <code>expr</code>; if you want to match the entire string instead, use the <code>^</code> and <code>$</code> markers at the start and end of your pattern. Similar to <a href="#comparison-operators"><code>LIKE</code></a>, but uses regexps instead of LIKE patterns. Especially useful in WHERE clauses.</td></tr>
+<tr><td><code>CONTAINS_STRING(&lt;expr&gt;, str)</code></td><td>Returns true if the <code>str</code> is a substring of <code>expr</code>.</td></tr>
+<tr><td><code>ICONTAINS_STRING(&lt;expr&gt;, str)</code></td><td>Returns true if the <code>str</code> is a substring of <code>expr</code>. The match is case-insensitive.</td></tr>
 <tr><td><code>REPLACE(expr, pattern, replacement)</code></td><td>Replaces pattern with replacement in expr, and returns the result.</td></tr>
 <tr><td><code>STRPOS(haystack, needle)</code></td><td>Returns the index of needle within haystack, with indexes starting from 1. If the needle is not found, returns 0.</td></tr>
 <tr><td><code>SUBSTRING(expr, index, [length])</code></td><td>Returns a substring of expr starting at index, with a max length, both measured in UTF-16 code units.</td></tr>
@@ -706,22 +766,25 @@
 <h3><a class="anchor" aria-hidden="true" id="unsupported-features"></a><a href="#unsupported-features" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Unsupported features</h3>
 <p>Druid does not support all SQL features. In particular, the following features are not supported.</p>
 <ul>
-<li>JOIN between native datasources (table, lookup, subquery) and system tables.</li>
+<li>JOIN between native datasources (table, lookup, subquery) and <a href="#metadata-tables">system tables</a>.</li>
 <li>JOIN conditions that are not an equality between expressions from the left- and right-hand sides.</li>
 <li>JOIN conditions containing a constant value inside the condition.</li>
 <li>JOIN conditions on a column which contains a multi-value dimension.</li>
 <li>OVER clauses, and analytic functions such as <code>LAG</code> and <code>LEAD</code>.</li>
-<li>OFFSET clauses.</li>
+<li>ORDER BY for a non-aggregating query, except for <code>ORDER BY __time</code> or <code>ORDER BY __time DESC</code>, which are supported.
+This restriction only applies to non-aggregating queries; you can ORDER BY any column in an aggregating query.</li>
 <li>DDL and DML.</li>
-<li>Using Druid-specific functions like <code>TIME_PARSE</code> and <code>APPROX_QUANTILE_DS</code> on <a href="#metadata-tables">metadata tables</a>.</li>
+<li>Using Druid-specific functions like <code>TIME_PARSE</code> and <code>APPROX_QUANTILE_DS</code> on <a href="#metadata-tables">system tables</a>.</li>
 </ul>
 <p>Additionally, some Druid native query features are not supported by the SQL language. Some unsupported Druid features
 include:</p>
 <ul>
-<li><a href="datasource.html#union">Union datasources</a></li>
-<li><a href="datasource.html#inline">Inline datasources</a></li>
+<li><a href="datasource.html#inline">Inline datasources</a>.</li>
 <li><a href="../development/geo.html">Spatial filters</a>.</li>
 <li><a href="querying.html#query-cancellation">Query cancellation</a>.</li>
+<li><a href="#multi-value-strings">Multi-value dimensions</a> are only partially implemented in Druid SQL. There are known
+inconsistencies between their behavior in SQL queries and in native queries due to how they are currently treated by
+the SQL planner.</li>
 </ul>
 <h2><a class="anchor" aria-hidden="true" id="client-apis"></a><a href="#client-apis" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Client APIs</h2>
 <p><a name="json-over-http"></a></p>
@@ -808,9 +871,7 @@
 through a JSON parsing error or through a missing trailing newline, you should assume the response was not fully
 delivered due to an error.</p>
 <h3><a class="anchor" aria-hidden="true" id="jdbc"></a><a href="#jdbc" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>JDBC</h3>
-<p>You can make Druid SQL queries using the <a href="https://calcite.apache.org/avatica/downloads/">Avatica JDBC driver</a>. Once
-you've downloaded the Avatica client jar, add it to your classpath and use the connect string
-<code>jdbc:avatica:remote:url=http://BROKER:8082/druid/v2/sql/avatica/</code>.</p>
+<p>You can make Druid SQL queries using the <a href="https://calcite.apache.org/avatica/downloads/">Avatica JDBC driver</a>. We recommend using Avatica JDBC driver version 1.17.0 or later. Note that as of the time of this writing, Avatica 1.17.0, the latest version, does not support passing connection string parameters from the URL to Druid, so you must pass them using a <code>Properties</code> object. Once you've downloaded the Avatica client jar, add it to your classpath and use the connect string <code>jdbc:avatica:remote:url=http://BROKER:8082/druid/v2/sql/avatica/</code>.</p>
 <p>Example code:</p>
 <pre><code class="hljs css language-java"><span class="hljs-comment">// Connect to /druid/v2/sql/avatica/ on your Broker.</span>
 String url = <span class="hljs-string">"jdbc:avatica:remote:url=http://localhost:8082/druid/v2/sql/avatica/"</span>;
@@ -825,7 +886,7 @@
       <span class="hljs-keyword">final</span> ResultSet resultSet = statement.executeQuery(query)
   ) {
     <span class="hljs-keyword">while</span> (resultSet.next()) {
-      <span class="hljs-comment">// Do something</span>
+      <span class="hljs-comment">// process result set</span>
     }
   }
 }
@@ -850,6 +911,17 @@
 <p>Druid SQL supports setting connection parameters on the client. The parameters in the table below affect SQL planning.
 All other context parameters you provide will be attached to Druid queries and can affect how they run. See
 <a href="query-context.html">Query context</a> for details on the possible options.</p>
+<pre><code class="hljs css language-java">String url = <span class="hljs-string">"jdbc:avatica:remote:url=http://localhost:8082/druid/v2/sql/avatica/"</span>;
+
+<span class="hljs-comment">// Set any query context parameters you need here.</span>
+Properties connectionProperties = <span class="hljs-keyword">new</span> Properties();
+connectionProperties.setProperty(<span class="hljs-string">"sqlTimeZone"</span>, <span class="hljs-string">"America/Los_Angeles"</span>);
+connectionProperties.setProperty(<span class="hljs-string">"useCache"</span>, <span class="hljs-string">"false"</span>);
+
+<span class="hljs-keyword">try</span> (Connection connection = DriverManager.getConnection(url, connectionProperties)) {
+  <span class="hljs-comment">// create and execute statements, process result sets, etc</span>
+}
+</code></pre>
 <p>Note that to specify an unique identifier for SQL query, use <code>sqlQueryId</code> instead of <code>queryId</code>. Setting <code>queryId</code> for a SQL
 request has no effect, all native queries underlying SQL will use auto-generated queryId.</p>
 <p>Connection context can be specified as JDBC connection properties or as a &quot;context&quot; object in the JSON API.</p>
@@ -967,6 +1039,7 @@
 <tr><td>shardSpec</td><td>STRING</td><td>The toString of specific <code>ShardSpec</code></td></tr>
 <tr><td>dimensions</td><td>STRING</td><td>The dimensions of the segment</td></tr>
 <tr><td>metrics</td><td>STRING</td><td>The metrics of the segment</td></tr>
+<tr><td>last_compaction_state</td><td>STRING</td><td>The configurations of the compaction task which created this segment. May be null if segment was not created by compaction task.</td></tr>
 </tbody>
 </table>
 <p>For example to retrieve all segments for datasource &quot;wikipedia&quot;, use the query:</p>
@@ -983,6 +1056,12 @@
 <span class="hljs-keyword">GROUP</span> <span class="hljs-keyword">BY</span> <span class="hljs-number">1</span>
 <span class="hljs-keyword">ORDER</span> <span class="hljs-keyword">BY</span> <span class="hljs-number">2</span> <span class="hljs-keyword">DESC</span>
 </code></pre>
+<p>If you want to retrieve segment that was compacted (ANY compaction):</p>
+<pre><code class="hljs css language-sql"><span class="hljs-keyword">SELECT</span> * <span class="hljs-keyword">FROM</span> sys.segments <span class="hljs-keyword">WHERE</span> last_compaction_state <span class="hljs-keyword">is</span> <span class="hljs-keyword">not</span> <span class="hljs-literal">null</span>
+</code></pre>
+<p>or if you want to retrieve segment that was compacted only by a particular compaction spec (such as that of the auto compaction):</p>
+<pre><code class="hljs css language-sql"><span class="hljs-keyword">SELECT</span> * <span class="hljs-keyword">FROM</span> sys.segments <span class="hljs-keyword">WHERE</span> last_compaction_state == <span class="hljs-string">'SELECT * FROM sys.segments where last_compaction_state = '</span>CompactionState{partitionsSpec=DynamicPartitionsSpec{maxRowsPerSegment=<span class="hljs-number">5000000</span>, maxTotalRows=<span class="hljs-number">9223372036854775807</span>}, indexSpec={<span class="hljs-keyword">bitmap</span>={<span class="hljs-keyword">type</span>=roaring, compressRunOnSerialization=<span class="hljs-literal">true</span>}, dimensionCompression=lz4, metricCompression=lz4, longEncoding=longs, segmentLoader=<span class="hljs-literal">null</span>}}<span class="hljs-string">'
+</span></code></pre>
 <p><em>Caveat:</em> Note that a segment can be served by more than one stream ingestion tasks or Historical processes, in that case it would have multiple replicas. These replicas are weakly consistent with each other when served by multiple ingestion tasks, until a segment is eventually served by a Historical, at that point the segment is immutable. Broker prefers to query a segment from Historical over an ingestion task. But if a segment has multiple realtime replicas, for e.g.. Kafka index tasks, and one task is slower than other, then the sys.segments query results can vary for the duration of the tasks because only one of the ingestion tasks is queried by the Broker and it is not guaranteed that the same task gets picked every time. The <code>num_rows</code> column of segments table can have inconsistent values during this period. There is an open <a href="https://github.com/apache/druid/issues/5915">issue</a> about this inconsistency with stream ingestion tasks.</p>
 <h4><a class="anchor" aria-hidden="true" id="servers-table"></a><a href="#servers-table" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>SERVERS table</h4>
 <p>Servers table lists all discovered servers in the cluster.</p>
@@ -1078,7 +1157,7 @@
 <h2><a class="anchor" aria-hidden="true" id="security"></a><a href="#security" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Security</h2>
 <p>Please see <a href="../development/extensions-core/druid-basic-security.html#sql-permissions">Defining SQL permissions</a> in the
 basic security documentation for information on what permissions are needed for making SQL queries.</p>
-</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/latest/ingestion/faq.html"><span class="arrow-prev">← </span><span>Troubleshooting FAQ</span></a><a class="docs-next button" href="/docs/latest/querying/querying.html"><span>Native queries</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#query-syntax">Query syntax</a><ul class="toc-headings"><li><a href="#from">FROM</a></li><li><a href="#where">WHERE</a></li><li><a href="#group-by">GROUP BY</a></li><li><a href="#having">HAVING</a></li><li><a href="#order-by">ORDER BY</a></li><li><a href="#limit">LIMIT</a></li><li><a href="#union-all">UNION ALL</a></li><li><a href="#explain-plan">EXPLAIN PLAN</a></li><li><a href="#identifiers-and-literals">Identifiers and literals</a></li><li><a href="#dynamic-parameters">Dynamic parameters</a></li></ul></li><li><a href="#data-types">Data types</a><ul class="toc-headings"><li><a href="#standard-types">Standard types</a></li><li><a href="#multi-value-strings">Multi-value strings</a></li><li><a href="#null-values">NULL values</a></li></ul></li><li><a href="#aggregation-functions">Aggregation functions</a></li><li><a href="#scalar-functions">Scalar functions</a><ul class="toc-headings"><li><a href="#numeric-functions">Numeric functions</a></li><li><a href="#string-functions">String functions</a></li><li><a href="#time-functions">Time functions</a></li><li><a href="#reduction-functions">Reduction functions</a></li><li><a href="#ip-address-functions">IP address functions</a></li><li><a href="#comparison-operators">Comparison operators</a></li><li><a href="#sketch-functions">Sketch functions</a></li><li><a href="#other-scalar-functions">Other scalar functions</a></li></ul></li><li><a href="#multi-value-string-functions">Multi-value string functions</a></li><li><a href="#query-translation">Query translation</a><ul class="toc-headings"><li><a href="#best-practices">Best practices</a></li><li><a href="#interpreting-explain-plan-output">Interpreting EXPLAIN PLAN output</a></li><li><a href="#query-types">Query types</a></li><li><a href="#time-filters">Time filters</a></li><li><a href="#joins">Joins</a></li><li><a href="#subqueries">Subqueries</a></li><li><a href="#approximations">Approximations</a></li><li><a href="#unsupported-features">Unsupported features</a></li></ul></li><li><a href="#client-apis">Client APIs</a><ul class="toc-headings"><li><a href="#http-post">HTTP POST</a></li><li><a href="#jdbc">JDBC</a></li><li><a href="#dynamic-parameters-1">Dynamic Parameters</a></li><li><a href="#connection-context">Connection context</a></li></ul></li><li><a href="#metadata-tables">Metadata tables</a><ul class="toc-headings"><li><a href="#information-schema">INFORMATION SCHEMA</a></li><li><a href="#system-schema">SYSTEM SCHEMA</a></li></ul></li><li><a href="#server-configuration">Server configuration</a></li><li><a href="#security">Security</a></li></ul></nav></div><footer class="nav-footer druid-footer" id="footer"><div class="container"><div class="text-center"><p><a href="/technology">Technology</a> · <a href="/use-cases">Use Cases</a> · <a href="/druid-powered">Powered by Druid</a> · <a href="/docs/latest/latest">Docs</a> · <a href="/community/">Community</a> · <a href="/downloads.html">Download</a> · <a href="/faq">FAQ</a></p></div><div class="text-center"><a title="Join the user group" href="https://groups.google.com/forum/#!forum/druid-user" target="_blank"><span class="fa fa-comments"></span></a> · <a title="Follow Druid" href="https://twitter.com/druidio" target="_blank"><span class="fab fa-twitter"></span></a> · <a title="Download via Apache" href="https://www.apache.org/dyn/closer.cgi?path=/incubator/druid/{{ site.druid_versions[0].versions[0].version }}/apache-druid-{{ site.druid_versions[0].versions[0].version }}-bin.tar.gz" target="_blank"><span class="fas fa-feather"></span></a> · <a title="GitHub" href="https://github.com/apache/druid" target="_blank"><span class="fab fa-github"></span></a></div><div class="text-center license">Copyright © 2019 <a href="https://www.apache.org/" target="_blank">Apache Software Foundation</a>.<br/>Except where otherwise noted, licensed under <a rel="license" href="http://creativecommons.org/licenses/by-sa/4.0/">CC BY-SA 4.0</a>.<br/>Apache Druid, Druid, and the Druid logo are either registered trademarks or trademarks of The Apache Software Foundation in the United States and other countries.</div></div></footer></div><script type="text/javascript" src="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.js"></script><script>
+</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/latest/ingestion/faq.html"><span class="arrow-prev">← </span><span>Troubleshooting FAQ</span></a><a class="docs-next button" href="/docs/latest/querying/querying.html"><span>Native queries</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#query-syntax">Query syntax</a><ul class="toc-headings"><li><a href="#from">FROM</a></li><li><a href="#where">WHERE</a></li><li><a href="#group-by">GROUP BY</a></li><li><a href="#having">HAVING</a></li><li><a href="#order-by">ORDER BY</a></li><li><a href="#limit">LIMIT</a></li><li><a href="#offset">OFFSET</a></li><li><a href="#union-all">UNION ALL</a></li><li><a href="#explain-plan">EXPLAIN PLAN</a></li><li><a href="#identifiers-and-literals">Identifiers and literals</a></li><li><a href="#dynamic-parameters">Dynamic parameters</a></li></ul></li><li><a href="#data-types">Data types</a><ul class="toc-headings"><li><a href="#standard-types">Standard types</a></li><li><a href="#multi-value-strings">Multi-value strings</a></li><li><a href="#null-values">NULL values</a></li></ul></li><li><a href="#aggregation-functions">Aggregation functions</a></li><li><a href="#scalar-functions">Scalar functions</a><ul class="toc-headings"><li><a href="#numeric-functions">Numeric functions</a></li><li><a href="#string-functions">String functions</a></li><li><a href="#time-functions">Time functions</a></li><li><a href="#reduction-functions">Reduction functions</a></li><li><a href="#ip-address-functions">IP address functions</a></li><li><a href="#comparison-operators">Comparison operators</a></li><li><a href="#sketch-functions">Sketch functions</a></li><li><a href="#other-scalar-functions">Other scalar functions</a></li></ul></li><li><a href="#multi-value-string-functions">Multi-value string functions</a></li><li><a href="#query-translation">Query translation</a><ul class="toc-headings"><li><a href="#best-practices">Best practices</a></li><li><a href="#interpreting-explain-plan-output">Interpreting EXPLAIN PLAN output</a></li><li><a href="#query-types">Query types</a></li><li><a href="#time-filters">Time filters</a></li><li><a href="#joins">Joins</a></li><li><a href="#subqueries">Subqueries</a></li><li><a href="#approximations">Approximations</a></li><li><a href="#unsupported-features">Unsupported features</a></li></ul></li><li><a href="#client-apis">Client APIs</a><ul class="toc-headings"><li><a href="#http-post">HTTP POST</a></li><li><a href="#jdbc">JDBC</a></li><li><a href="#dynamic-parameters-1">Dynamic Parameters</a></li><li><a href="#connection-context">Connection context</a></li></ul></li><li><a href="#metadata-tables">Metadata tables</a><ul class="toc-headings"><li><a href="#information-schema">INFORMATION SCHEMA</a></li><li><a href="#system-schema">SYSTEM SCHEMA</a></li></ul></li><li><a href="#server-configuration">Server configuration</a></li><li><a href="#security">Security</a></li></ul></nav></div><footer class="nav-footer druid-footer" id="footer"><div class="container"><div class="text-center"><p><a href="/technology">Technology</a> · <a href="/use-cases">Use Cases</a> · <a href="/druid-powered">Powered by Druid</a> · <a href="/docs/latest/latest">Docs</a> · <a href="/community/">Community</a> · <a href="/downloads.html">Download</a> · <a href="/faq">FAQ</a></p></div><div class="text-center"><a title="Join the user group" href="https://groups.google.com/forum/#!forum/druid-user" target="_blank"><span class="fa fa-comments"></span></a> · <a title="Follow Druid" href="https://twitter.com/druidio" target="_blank"><span class="fab fa-twitter"></span></a> · <a title="Download via Apache" href="https://www.apache.org/dyn/closer.cgi?path=/incubator/druid/{{ site.druid_versions[0].versions[0].version }}/apache-druid-{{ site.druid_versions[0].versions[0].version }}-bin.tar.gz" target="_blank"><span class="fas fa-feather"></span></a> · <a title="GitHub" href="https://github.com/apache/druid" target="_blank"><span class="fab fa-github"></span></a></div><div class="text-center license">Copyright © 2019 <a href="https://www.apache.org/" target="_blank">Apache Software Foundation</a>.<br/>Except where otherwise noted, licensed under <a rel="license" href="http://creativecommons.org/licenses/by-sa/4.0/">CC BY-SA 4.0</a>.<br/>Apache Druid, Druid, and the Druid logo are either registered trademarks or trademarks of The Apache Software Foundation in the United States and other countries.</div></div></footer></div><script type="text/javascript" src="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.js"></script><script>
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diff --git a/docs/latest/querying/timeboundaryquery.html b/docs/latest/querying/timeboundaryquery.html
index b8a0859..3116e08 100644
--- a/docs/latest/querying/timeboundaryquery.html
+++ b/docs/latest/querying/timeboundaryquery.html
@@ -1,4 +1,4 @@
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+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>TimeBoundary queries · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/querying/timeboundaryquery.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.20.0" /><meta property="og:title" content="TimeBoundary queries · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
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diff --git a/docs/latest/querying/timeseriesquery.html b/docs/latest/querying/timeseriesquery.html
index 68151aa..459db5b 100644
--- a/docs/latest/querying/timeseriesquery.html
+++ b/docs/latest/querying/timeseriesquery.html
@@ -1,4 +1,4 @@
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+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Timeseries queries · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/querying/timeseriesquery.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.20.0" /><meta property="og:title" content="Timeseries queries · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
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+++ b/docs/latest/querying/topnmetricspec.html
@@ -1,4 +1,4 @@
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+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Sorting (topN) · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/querying/topnmetricspec.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.20.0" /><meta property="og:title" content="Sorting (topN) · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
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diff --git a/docs/latest/querying/topnquery.html b/docs/latest/querying/topnquery.html
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+++ b/docs/latest/querying/topnquery.html
@@ -1,4 +1,4 @@
-<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>TopN queries · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/querying/topnquery.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.19.0" /><meta property="og:title" content="TopN queries · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>TopN queries · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/querying/topnquery.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.20.0" /><meta property="og:title" content="TopN queries · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
               window.dataLayer = window.dataLayer || [];
               function gtag(){dataLayer.push(arguments); }
               gtag('js', new Date());
@@ -310,6 +310,6 @@
                 apiKey: '2de99082a9f38e49dfaa059bbe4c901d',
                 indexName: 'apache_druid',
                 inputSelector: '#search_input_react',
-                algoliaOptions: {"facetFilters":["language:en","version:0.19.0"]}
+                algoliaOptions: {"facetFilters":["language:en","version:0.20.0"]}
               });
             </script></body></html>
\ No newline at end of file
diff --git a/docs/latest/querying/virtual-columns.html b/docs/latest/querying/virtual-columns.html
index cb7efdf..eb41d13 100644
--- a/docs/latest/querying/virtual-columns.html
+++ b/docs/latest/querying/virtual-columns.html
@@ -1,4 +1,4 @@
-<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Virtual columns · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/querying/virtual-columns.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.19.0" /><meta property="og:title" content="Virtual columns · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Virtual columns · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/querying/virtual-columns.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.20.0" /><meta property="og:title" content="Virtual columns · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
               window.dataLayer = window.dataLayer || [];
               function gtag(){dataLayer.push(arguments); }
               gtag('js', new Date());
@@ -147,6 +147,6 @@
                 apiKey: '2de99082a9f38e49dfaa059bbe4c901d',
                 indexName: 'apache_druid',
                 inputSelector: '#search_input_react',
-                algoliaOptions: {"facetFilters":["language:en","version:0.19.0"]}
+                algoliaOptions: {"facetFilters":["language:en","version:0.20.0"]}
               });
             </script></body></html>
\ No newline at end of file
diff --git a/docs/latest/tutorials/cluster.html b/docs/latest/tutorials/cluster.html
index b075ac5..856c166 100644
--- a/docs/latest/tutorials/cluster.html
+++ b/docs/latest/tutorials/cluster.html
@@ -1,4 +1,4 @@
-<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Clustered deployment · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/tutorials/cluster.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.19.0" /><meta property="og:title" content="Clustered deployment · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Clustered deployment · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/tutorials/cluster.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.20.0" /><meta property="og:title" content="Clustered deployment · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
               window.dataLayer = window.dataLayer || [];
               function gtag(){dataLayer.push(arguments); }
               gtag('js', new Date());
@@ -158,11 +158,11 @@
 <p>First, download and unpack the release archive. It's best to do this on a single machine at first,
 since you will be editing the configurations and then copying the modified distribution out to all
 of your servers.</p>
-<p><a href="https://www.apache.org/dyn/closer.cgi?path=/druid/0.19.0/apache-druid-0.19.0-bin.tar.gz">Download</a>
-the 0.19.0 release.</p>
+<p><a href="https://www.apache.org/dyn/closer.cgi?path=/druid/0.20.0/apache-druid-0.20.0-bin.tar.gz">Download</a>
+the 0.20.0 release.</p>
 <p>Extract Druid by running the following commands in your terminal:</p>
-<pre><code class="hljs css language-bash">tar -xzf apache-druid-0.19.0-bin.tar.gz
-<span class="hljs-built_in">cd</span> apache-druid-0.19.0
+<pre><code class="hljs css language-bash">tar -xzf apache-druid-0.20.0-bin.tar.gz
+<span class="hljs-built_in">cd</span> apache-druid-0.20.0
 </code></pre>
 <p>In the package, you should find:</p>
 <ul>
@@ -360,7 +360,7 @@
 <h2><a class="anchor" aria-hidden="true" id="start-master-server"></a><a href="#start-master-server" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Start Master Server</h2>
 <p>Copy the Druid distribution and your edited configurations to your Master server.</p>
 <p>If you have been editing the configurations on your local machine, you can use <em>rsync</em> to copy them:</p>
-<pre><code class="hljs css language-bash">rsync -az apache-druid-0.19.0/ MASTER_SERVER:apache-druid-0.19.0/
+<pre><code class="hljs css language-bash">rsync -az apache-druid-0.20.0/ MASTER_SERVER:apache-druid-0.20.0/
 </code></pre>
 <h3><a class="anchor" aria-hidden="true" id="no-zookeeper-on-master"></a><a href="#no-zookeeper-on-master" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>No Zookeeper on Master</h3>
 <p>From the distribution root, run the following command to start the Master server:</p>
@@ -410,6 +410,6 @@
                 apiKey: '2de99082a9f38e49dfaa059bbe4c901d',
                 indexName: 'apache_druid',
                 inputSelector: '#search_input_react',
-                algoliaOptions: {"facetFilters":["language:en","version:0.19.0"]}
+                algoliaOptions: {"facetFilters":["language:en","version:0.20.0"]}
               });
             </script></body></html>
\ No newline at end of file
diff --git a/docs/latest/tutorials/docker.html b/docs/latest/tutorials/docker.html
index dee7fe9..9421b2e 100644
--- a/docs/latest/tutorials/docker.html
+++ b/docs/latest/tutorials/docker.html
@@ -1,4 +1,4 @@
-<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Docker · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/tutorials/docker.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.19.0" /><meta property="og:title" content="Docker · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Docker · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/tutorials/docker.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.20.0" /><meta property="og:title" content="Docker · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
               window.dataLayer = window.dataLayer || [];
               function gtag(){dataLayer.push(arguments); }
               gtag('js', new Date());
@@ -134,6 +134,6 @@
                 apiKey: '2de99082a9f38e49dfaa059bbe4c901d',
                 indexName: 'apache_druid',
                 inputSelector: '#search_input_react',
-                algoliaOptions: {"facetFilters":["language:en","version:0.19.0"]}
+                algoliaOptions: {"facetFilters":["language:en","version:0.20.0"]}
               });
             </script></body></html>
\ No newline at end of file
diff --git a/docs/latest/tutorials/index.html b/docs/latest/tutorials/index.html
index 3412535..345409d 100644
--- a/docs/latest/tutorials/index.html
+++ b/docs/latest/tutorials/index.html
@@ -1,4 +1,4 @@
-<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Quickstart · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/tutorials/index.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.19.0" /><meta property="og:title" content="Quickstart · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Quickstart · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/tutorials/index.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.20.0" /><meta property="og:title" content="Quickstart · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
               window.dataLayer = window.dataLayer || [];
               function gtag(){dataLayer.push(arguments); }
               gtag('js', new Date());
@@ -112,29 +112,29 @@
 <p>After confirming the <a href="#requirements">requirements</a>, follow these steps:</p>
 <ol>
 <li><p>Download
-the <a href="https://www.apache.org/dyn/closer.cgi?path=/druid/0.19.0/apache-druid-0.19.0-bin.tar.gz">0.19.0 release</a>.</p></li>
+the <a href="https://www.apache.org/dyn/closer.cgi?path=/druid/0.20.0/apache-druid-0.20.0-bin.tar.gz">0.20.0 release</a>.</p></li>
 <li><p>In your terminal, extract Druid and change directories to the distribution directory:</p>
-<pre><code class="hljs css language-bash">tar -xzf apache-druid-0.19.0-bin.tar.gz
-<span class="hljs-built_in">cd</span> apache-druid-0.19.0
+<pre><code class="hljs css language-bash">tar -xzf apache-druid-0.20.0-bin.tar.gz
+<span class="hljs-built_in">cd</span> apache-druid-0.20.0
 </code></pre></li>
 </ol>
 <p>In the directory, you'll find <code>LICENSE</code> and <code>NOTICE</code> files and subdirectories for executable files, configuration files, sample data and more.</p>
 <h2><a class="anchor" aria-hidden="true" id="step-2-start-up-druid-services"></a><a href="#step-2-start-up-druid-services" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Step 2: Start up Druid services</h2>
 <p>Start up Druid services using the <code>micro-quickstart</code> single-machine configuration.</p>
-<p>From the apache-druid-0.19.0 package root, run the following command:</p>
+<p>From the apache-druid-0.20.0 package root, run the following command:</p>
 <pre><code class="hljs css language-bash">./bin/start-micro-quickstart
 </code></pre>
 <p>This brings up instances of ZooKeeper and the Druid services:</p>
 <pre><code class="hljs css language-bash">$ ./bin/start-micro-quickstart
-[Fri May  3 11:40:50 2019] Running <span class="hljs-built_in">command</span>[zk], logging to[/apache-druid-0.19.0/var/sv/zk.log]: bin/run-zk conf
-[Fri May  3 11:40:50 2019] Running <span class="hljs-built_in">command</span>[coordinator-overlord], logging to[/apache-druid-0.19.0/var/sv/coordinator-overlord.log]: bin/run-druid coordinator-overlord conf/druid/single-server/micro-quickstart
-[Fri May  3 11:40:50 2019] Running <span class="hljs-built_in">command</span>[broker], logging to[/apache-druid-0.19.0/var/sv/broker.log]: bin/run-druid broker conf/druid/single-server/micro-quickstart
-[Fri May  3 11:40:50 2019] Running <span class="hljs-built_in">command</span>[router], logging to[/apache-druid-0.19.0/var/sv/router.log]: bin/run-druid router conf/druid/single-server/micro-quickstart
-[Fri May  3 11:40:50 2019] Running <span class="hljs-built_in">command</span>[historical], logging to[/apache-druid-0.19.0/var/sv/historical.log]: bin/run-druid historical conf/druid/single-server/micro-quickstart
-[Fri May  3 11:40:50 2019] Running <span class="hljs-built_in">command</span>[middleManager], logging to[/apache-druid-0.19.0/var/sv/middleManager.log]: bin/run-druid middleManager conf/druid/single-server/micro-quickstart
+[Fri May  3 11:40:50 2019] Running <span class="hljs-built_in">command</span>[zk], logging to[/apache-druid-0.20.0/var/sv/zk.log]: bin/run-zk conf
+[Fri May  3 11:40:50 2019] Running <span class="hljs-built_in">command</span>[coordinator-overlord], logging to[/apache-druid-0.20.0/var/sv/coordinator-overlord.log]: bin/run-druid coordinator-overlord conf/druid/single-server/micro-quickstart
+[Fri May  3 11:40:50 2019] Running <span class="hljs-built_in">command</span>[broker], logging to[/apache-druid-0.20.0/var/sv/broker.log]: bin/run-druid broker conf/druid/single-server/micro-quickstart
+[Fri May  3 11:40:50 2019] Running <span class="hljs-built_in">command</span>[router], logging to[/apache-druid-0.20.0/var/sv/router.log]: bin/run-druid router conf/druid/single-server/micro-quickstart
+[Fri May  3 11:40:50 2019] Running <span class="hljs-built_in">command</span>[historical], logging to[/apache-druid-0.20.0/var/sv/historical.log]: bin/run-druid historical conf/druid/single-server/micro-quickstart
+[Fri May  3 11:40:50 2019] Running <span class="hljs-built_in">command</span>[middleManager], logging to[/apache-druid-0.20.0/var/sv/middleManager.log]: bin/run-druid middleManager conf/druid/single-server/micro-quickstart
 </code></pre>
 <p>All persistent state, such as the cluster metadata store and segments for the services, are kept in the <code>var</code> directory under
-the Druid root directory, apache-druid-0.19.0. Each service writes to a log file under <code>var/sv</code>, as noted in the startup script output above.</p>
+the Druid root directory, apache-druid-0.20.0. Each service writes to a log file under <code>var/sv</code>, as noted in the startup script output above.</p>
 <p>At any time, you can revert Druid to its original, post-installation state by deleting the entire <code>var</code> directory. You may
 want to do this, for example, between Druid tutorials or after experimentation, to start with a fresh instance.</p>
 <p>To stop Druid at any time, use CTRL-C in the terminal. This exits the <code>bin/start-micro-quickstart</code> script and
@@ -263,6 +263,6 @@
                 apiKey: '2de99082a9f38e49dfaa059bbe4c901d',
                 indexName: 'apache_druid',
                 inputSelector: '#search_input_react',
-                algoliaOptions: {"facetFilters":["language:en","version:0.19.0"]}
+                algoliaOptions: {"facetFilters":["language:en","version:0.20.0"]}
               });
             </script></body></html>
\ No newline at end of file
diff --git a/docs/latest/tutorials/tutorial-batch-hadoop.html b/docs/latest/tutorials/tutorial-batch-hadoop.html
index d3c0f27..16672e6 100644
--- a/docs/latest/tutorials/tutorial-batch-hadoop.html
+++ b/docs/latest/tutorials/tutorial-batch-hadoop.html
@@ -1,4 +1,4 @@
-<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Tutorial: Load batch data using Apache Hadoop · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/tutorials/tutorial-batch-hadoop.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.19.0" /><meta property="og:title" content="Tutorial: Load batch data using Apache Hadoop · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Tutorial: Load batch data using Apache Hadoop · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/tutorials/tutorial-batch-hadoop.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.20.0" /><meta property="og:title" content="Tutorial: Load batch data using Apache Hadoop · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
               window.dataLayer = window.dataLayer || [];
               function gtag(){dataLayer.push(arguments); }
               gtag('js', new Date());
@@ -87,7 +87,7 @@
 <h2><a class="anchor" aria-hidden="true" id="build-the-hadoop-docker-image"></a><a href="#build-the-hadoop-docker-image" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Build the Hadoop docker image</h2>
 <p>For this tutorial, we've provided a Dockerfile for a Hadoop 2.8.5 cluster, which we'll use to run the batch indexing task.</p>
 <p>This Dockerfile and related files are located at <code>quickstart/tutorial/hadoop/docker</code>.</p>
-<p>From the apache-druid-0.19.0 package root, run the following commands to build a Docker image named &quot;druid-hadoop-demo&quot; with version tag &quot;2.8.5&quot;:</p>
+<p>From the apache-druid-0.20.0 package root, run the following commands to build a Docker image named &quot;druid-hadoop-demo&quot; with version tag &quot;2.8.5&quot;:</p>
 <pre><code class="hljs css language-bash"><span class="hljs-built_in">cd</span> quickstart/tutorial/hadoop/docker
 docker build -t druid-hadoop-demo:2.8.5 .
 </code></pre>
@@ -128,7 +128,7 @@
 <pre><code class="hljs"><span class="hljs-symbol">docker</span> exec -<span class="hljs-keyword">it </span>druid-hadoop-demo <span class="hljs-keyword">bash
 </span></code></pre>
 <h3><a class="anchor" aria-hidden="true" id="copy-input-data-to-the-hadoop-container"></a><a href="#copy-input-data-to-the-hadoop-container" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Copy input data to the Hadoop container</h3>
-<p>From the apache-druid-0.19.0 package root on the host, copy the <code>quickstart/tutorial/wikiticker-2015-09-12-sampled.json.gz</code> sample data to the shared folder:</p>
+<p>From the apache-druid-0.20.0 package root on the host, copy the <code>quickstart/tutorial/wikiticker-2015-09-12-sampled.json.gz</code> sample data to the shared folder:</p>
 <pre><code class="hljs css language-bash">cp quickstart/tutorial/wikiticker-2015-09-12-sampled.json.gz /tmp/shared/wikiticker-2015-09-12-sampled.json.gz
 </code></pre>
 <h3><a class="anchor" aria-hidden="true" id="setup-hdfs-directories"></a><a href="#setup-hdfs-directories" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Setup HDFS directories</h3>
@@ -191,7 +191,7 @@
 <p>We've included a sample of Wikipedia edits from September 12, 2015 to get you started.</p>
 <p>To load this data into Druid, you can submit an <em>ingestion task</em> pointing to the file. We've included
 a task that loads the <code>wikiticker-2015-09-12-sampled.json.gz</code> file included in the archive.</p>
-<p>Let's submit the <code>wikipedia-index-hadoop-.json</code> task:</p>
+<p>Let's submit the <code>wikipedia-index-hadoop.json</code> task:</p>
 <pre><code class="hljs css language-bash">bin/post-index-task --file quickstart/tutorial/wikipedia-index-hadoop.json --url http://localhost:8081
 </code></pre>
 <h2><a class="anchor" aria-hidden="true" id="querying-your-data"></a><a href="#querying-your-data" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Querying your data</h2>
@@ -250,6 +250,6 @@
                 apiKey: '2de99082a9f38e49dfaa059bbe4c901d',
                 indexName: 'apache_druid',
                 inputSelector: '#search_input_react',
-                algoliaOptions: {"facetFilters":["language:en","version:0.19.0"]}
+                algoliaOptions: {"facetFilters":["language:en","version:0.20.0"]}
               });
             </script></body></html>
\ No newline at end of file
diff --git a/docs/latest/tutorials/tutorial-batch.html b/docs/latest/tutorials/tutorial-batch.html
index fb566fd..d0a3705 100644
--- a/docs/latest/tutorials/tutorial-batch.html
+++ b/docs/latest/tutorials/tutorial-batch.html
@@ -1,4 +1,4 @@
-<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Tutorial: Loading a file · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/tutorials/tutorial-batch.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.19.0" /><meta property="og:title" content="Tutorial: Loading a file · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Tutorial: Loading a file · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/tutorials/tutorial-batch.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.20.0" /><meta property="og:title" content="Tutorial: Loading a file · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
               window.dataLayer = window.dataLayer || [];
               function gtag(){dataLayer.push(arguments); }
               gtag('js', new Date());
@@ -174,7 +174,7 @@
 <p>Once the spec is submitted, you can follow the same instructions as above to wait for the data to load and then query it.</p>
 <h2><a class="anchor" aria-hidden="true" id="loading-data-without-the-script"></a><a href="#loading-data-without-the-script" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Loading data without the script</h2>
 <p>Let's briefly discuss how we would've submitted the ingestion task without using the script. You do not need to run these commands.</p>
-<p>To submit the task, POST it to Druid in a new terminal window from the apache-druid-0.19.0 directory:</p>
+<p>To submit the task, POST it to Druid in a new terminal window from the apache-druid-0.20.0 directory:</p>
 <pre><code class="hljs css language-bash">curl -X <span class="hljs-string">'POST'</span> -H <span class="hljs-string">'Content-Type:application/json'</span> -d @quickstart/tutorial/wikipedia-index.json http://localhost:8081/druid/indexer/v1/task
 </code></pre>
 <p>Which will print the ID of the task if the submission was successful:</p>
@@ -204,6 +204,6 @@
                 apiKey: '2de99082a9f38e49dfaa059bbe4c901d',
                 indexName: 'apache_druid',
                 inputSelector: '#search_input_react',
-                algoliaOptions: {"facetFilters":["language:en","version:0.19.0"]}
+                algoliaOptions: {"facetFilters":["language:en","version:0.20.0"]}
               });
             </script></body></html>
\ No newline at end of file
diff --git a/docs/latest/tutorials/tutorial-compaction.html b/docs/latest/tutorials/tutorial-compaction.html
index d13ef57..1503855 100644
--- a/docs/latest/tutorials/tutorial-compaction.html
+++ b/docs/latest/tutorials/tutorial-compaction.html
@@ -1,4 +1,4 @@
-<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Tutorial: Compacting segments · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/tutorials/tutorial-compaction.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.19.0" /><meta property="og:title" content="Tutorial: Compacting segments · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Tutorial: Compacting segments · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/tutorials/tutorial-compaction.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.20.0" /><meta property="og:title" content="Tutorial: Compacting segments · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
               window.dataLayer = window.dataLayer || [];
               function gtag(){dataLayer.push(arguments); }
               gtag('js', new Date());
@@ -187,6 +187,6 @@
                 apiKey: '2de99082a9f38e49dfaa059bbe4c901d',
                 indexName: 'apache_druid',
                 inputSelector: '#search_input_react',
-                algoliaOptions: {"facetFilters":["language:en","version:0.19.0"]}
+                algoliaOptions: {"facetFilters":["language:en","version:0.20.0"]}
               });
             </script></body></html>
\ No newline at end of file
diff --git a/docs/latest/tutorials/tutorial-delete-data.html b/docs/latest/tutorials/tutorial-delete-data.html
index 0001808..edb6886 100644
--- a/docs/latest/tutorials/tutorial-delete-data.html
+++ b/docs/latest/tutorials/tutorial-delete-data.html
@@ -1,4 +1,4 @@
-<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Tutorial: Deleting data · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/tutorials/tutorial-delete-data.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.19.0" /><meta property="og:title" content="Tutorial: Deleting data · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Tutorial: Deleting data · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/tutorials/tutorial-delete-data.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.20.0" /><meta property="og:title" content="Tutorial: Deleting data · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
               window.dataLayer = window.dataLayer || [];
               function gtag(){dataLayer.push(arguments); }
               gtag('js', new Date());
@@ -206,6 +206,6 @@
                 apiKey: '2de99082a9f38e49dfaa059bbe4c901d',
                 indexName: 'apache_druid',
                 inputSelector: '#search_input_react',
-                algoliaOptions: {"facetFilters":["language:en","version:0.19.0"]}
+                algoliaOptions: {"facetFilters":["language:en","version:0.20.0"]}
               });
             </script></body></html>
\ No newline at end of file
diff --git a/docs/latest/tutorials/tutorial-ingestion-spec.html b/docs/latest/tutorials/tutorial-ingestion-spec.html
index 9c8cbcd..fcbc162 100644
--- a/docs/latest/tutorials/tutorial-ingestion-spec.html
+++ b/docs/latest/tutorials/tutorial-ingestion-spec.html
@@ -1,4 +1,4 @@
-<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Tutorial: Writing an ingestion spec · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/tutorials/tutorial-ingestion-spec.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.19.0" /><meta property="og:title" content="Tutorial: Writing an ingestion spec · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Tutorial: Writing an ingestion spec · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/tutorials/tutorial-ingestion-spec.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.20.0" /><meta property="og:title" content="Tutorial: Writing an ingestion spec · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
               window.dataLayer = window.dataLayer || [];
               function gtag(){dataLayer.push(arguments); }
               gtag('js', new Date());
@@ -520,7 +520,7 @@
 }
 </code></pre>
 <h2><a class="anchor" aria-hidden="true" id="submit-the-task-and-query-the-data"></a><a href="#submit-the-task-and-query-the-data" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Submit the task and query the data</h2>
-<p>From the apache-druid-0.19.0 package root, run the following command:</p>
+<p>From the apache-druid-0.20.0 package root, run the following command:</p>
 <pre><code class="hljs css language-bash">bin/post-index-task --file quickstart/ingestion-tutorial-index.json --url http://localhost:8081
 </code></pre>
 <p>After the script completes, we will query the data.</p>
@@ -560,6 +560,6 @@
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                 indexName: 'apache_druid',
                 inputSelector: '#search_input_react',
-                algoliaOptions: {"facetFilters":["language:en","version:0.19.0"]}
+                algoliaOptions: {"facetFilters":["language:en","version:0.20.0"]}
               });
             </script></body></html>
\ No newline at end of file
diff --git a/docs/latest/tutorials/tutorial-kafka.html b/docs/latest/tutorials/tutorial-kafka.html
index e5b0667..c88064a 100644
--- a/docs/latest/tutorials/tutorial-kafka.html
+++ b/docs/latest/tutorials/tutorial-kafka.html
@@ -1,4 +1,4 @@
-<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Tutorial: Load streaming data from Apache Kafka · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/tutorials/tutorial-kafka.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.19.0" /><meta property="og:title" content="Tutorial: Load streaming data from Apache Kafka · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Tutorial: Load streaming data from Apache Kafka · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/tutorials/tutorial-kafka.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.20.0" /><meta property="og:title" content="Tutorial: Load streaming data from Apache Kafka · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
               window.dataLayer = window.dataLayer || [];
               function gtag(){dataLayer.push(arguments); }
               gtag('js', new Date());
@@ -84,17 +84,17 @@
 running on your local machine. You don't need to have loaded any data yet.</p>
 <h2><a class="anchor" aria-hidden="true" id="download-and-start-kafka"></a><a href="#download-and-start-kafka" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Download and start Kafka</h2>
 <p><a href="http://kafka.apache.org/">Apache Kafka</a> is a high throughput message bus that works well with
-Druid.  For this tutorial, we will use Kafka 2.1.0. To download Kafka, issue the following
+Druid.  For this tutorial, we will use Kafka 2.6.0. To download Kafka, issue the following
 commands in your terminal:</p>
-<pre><code class="hljs css language-bash">curl -O https://archive.apache.org/dist/kafka/2.1.0/kafka_2.12-2.1.0.tgz
-tar -xzf kafka_2.12-2.1.0.tgz
-<span class="hljs-built_in">cd</span> kafka_2.12-2.1.0
+<pre><code class="hljs css language-bash">curl -O https://archive.apache.org/dist/kafka/2.6.0/kafka_2.13-2.6.0.tgz
+tar -xzf kafka_2.13-2.6.0.tgz
+<span class="hljs-built_in">cd</span> kafka_2.13-2.6.0
 </code></pre>
 <p>Start a Kafka broker by running the following command in a new terminal:</p>
 <pre><code class="hljs css language-bash">./bin/kafka-server-start.sh config/server.properties
 </code></pre>
 <p>Run this command to create a Kafka topic called <em>wikipedia</em>, to which we'll send data:</p>
-<pre><code class="hljs css language-bash">./bin/kafka-topics.sh --create --zookeeper localhost:2181 --replication-factor 1 --partitions 1 --topic wikipedia
+<pre><code class="hljs css language-bash">./bin/kafka-topics.sh --create --topic wikipedia --bootstrap-server localhost:9092
 </code></pre>
 <h2><a class="anchor" aria-hidden="true" id="load-data-into-kafka"></a><a href="#load-data-into-kafka" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Load data into Kafka</h2>
 <p>Let's launch a producer for our topic and send some data!</p>
@@ -138,7 +138,7 @@
 <p>Click <code>Next: Tune</code> to go to the tuning step.</p>
 <p><img src="../assets/tutorial-kafka-data-loader-07.png" alt="Data loader tune" title="Data loader tune"></p>
 <p>In the <code>Tune</code> step is it <em>very important</em> to set <code>Use earliest offset</code> to <code>True</code> since we want to consume the data from the start of the stream.
-There are no other changes that need to be made hear, so click <code>Next: Publish</code> to go to the <code>Publish</code> step.</p>
+There are no other changes that need to be made here, so click <code>Next: Publish</code> to go to the <code>Publish</code> step.</p>
 <p><img src="../assets/tutorial-kafka-data-loader-08.png" alt="Data loader publish" title="Data loader publish"></p>
 <p>Let's name this datasource <code>wikipedia-kafka</code>.</p>
 <p>Finally, click <code>Next</code> to review your spec.</p>
@@ -258,6 +258,6 @@
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                 indexName: 'apache_druid',
                 inputSelector: '#search_input_react',
-                algoliaOptions: {"facetFilters":["language:en","version:0.19.0"]}
+                algoliaOptions: {"facetFilters":["language:en","version:0.20.0"]}
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             </script></body></html>
\ No newline at end of file
diff --git a/docs/latest/tutorials/tutorial-kerberos-hadoop.html b/docs/latest/tutorials/tutorial-kerberos-hadoop.html
index f72a824..32d7e82 100644
--- a/docs/latest/tutorials/tutorial-kerberos-hadoop.html
+++ b/docs/latest/tutorials/tutorial-kerberos-hadoop.html
@@ -1,4 +1,4 @@
-<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Configuring Apache Druid to use Kerberized Apache Hadoop as deep storage · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/tutorials/tutorial-kerberos-hadoop.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.19.0" /><meta property="og:title" content="Configuring Apache Druid to use Kerberized Apache Hadoop as deep storage · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Configuring Apache Druid to use Kerberized Apache Hadoop as deep storage · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/tutorials/tutorial-kerberos-hadoop.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.20.0" /><meta property="og:title" content="Configuring Apache Druid to use Kerberized Apache Hadoop as deep storage · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
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               gtag('js', new Date());
@@ -165,6 +165,6 @@
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                 indexName: 'apache_druid',
                 inputSelector: '#search_input_react',
-                algoliaOptions: {"facetFilters":["language:en","version:0.19.0"]}
+                algoliaOptions: {"facetFilters":["language:en","version:0.20.0"]}
               });
             </script></body></html>
\ No newline at end of file
diff --git a/docs/latest/tutorials/tutorial-query.html b/docs/latest/tutorials/tutorial-query.html
index 63255cf..d5b460b 100644
--- a/docs/latest/tutorials/tutorial-query.html
+++ b/docs/latest/tutorials/tutorial-query.html
@@ -1,4 +1,4 @@
-<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Tutorial: Querying data · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/tutorials/tutorial-query.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.19.0" /><meta property="og:title" content="Tutorial: Querying data · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Tutorial: Querying data · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/tutorials/tutorial-query.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.20.0" /><meta property="og:title" content="Tutorial: Querying data · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
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@@ -281,6 +281,6 @@
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-                algoliaOptions: {"facetFilters":["language:en","version:0.19.0"]}
+                algoliaOptions: {"facetFilters":["language:en","version:0.20.0"]}
               });
             </script></body></html>
\ No newline at end of file
diff --git a/docs/latest/tutorials/tutorial-retention.html b/docs/latest/tutorials/tutorial-retention.html
index 3a7c68d..4df1771 100644
--- a/docs/latest/tutorials/tutorial-retention.html
+++ b/docs/latest/tutorials/tutorial-retention.html
@@ -1,4 +1,4 @@
-<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Tutorial: Configuring data retention · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/tutorials/tutorial-retention.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.19.0" /><meta property="og:title" content="Tutorial: Configuring data retention · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Tutorial: Configuring data retention · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/tutorials/tutorial-retention.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.20.0" /><meta property="og:title" content="Tutorial: Configuring data retention · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
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@@ -144,6 +144,6 @@
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                 indexName: 'apache_druid',
                 inputSelector: '#search_input_react',
-                algoliaOptions: {"facetFilters":["language:en","version:0.19.0"]}
+                algoliaOptions: {"facetFilters":["language:en","version:0.20.0"]}
               });
             </script></body></html>
\ No newline at end of file
diff --git a/docs/latest/tutorials/tutorial-rollup.html b/docs/latest/tutorials/tutorial-rollup.html
index 7bc2edf..bf5c693 100644
--- a/docs/latest/tutorials/tutorial-rollup.html
+++ b/docs/latest/tutorials/tutorial-rollup.html
@@ -1,4 +1,4 @@
-<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Tutorial: Roll-up · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/tutorials/tutorial-rollup.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.19.0" /><meta property="og:title" content="Tutorial: Roll-up · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Tutorial: Roll-up · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/tutorials/tutorial-rollup.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.20.0" /><meta property="og:title" content="Tutorial: Roll-up · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
               window.dataLayer = window.dataLayer || [];
               function gtag(){dataLayer.push(arguments); }
               gtag('js', new Date());
@@ -148,7 +148,7 @@
 <p>Note that we have <code>srcIP</code> and <code>dstIP</code> defined as dimensions, a longSum metric is defined for the <code>packets</code> and <code>bytes</code> columns, and the <code>queryGranularity</code> has been defined as <code>minute</code>.</p>
 <p>We will see how these definitions are used after we load this data.</p>
 <h2><a class="anchor" aria-hidden="true" id="load-the-example-data"></a><a href="#load-the-example-data" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Load the example data</h2>
-<p>From the apache-druid-0.19.0 package root, run the following command:</p>
+<p>From the apache-druid-0.20.0 package root, run the following command:</p>
 <pre><code class="hljs css language-bash">bin/post-index-task --file quickstart/tutorial/rollup-index.json --url http://localhost:8081
 </code></pre>
 <p>After the script completes, we will query the data.</p>
@@ -222,6 +222,6 @@
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+                algoliaOptions: {"facetFilters":["language:en","version:0.20.0"]}
               });
             </script></body></html>
\ No newline at end of file
diff --git a/docs/latest/tutorials/tutorial-transform-spec.html b/docs/latest/tutorials/tutorial-transform-spec.html
index a7225ef..97a9579 100644
--- a/docs/latest/tutorials/tutorial-transform-spec.html
+++ b/docs/latest/tutorials/tutorial-transform-spec.html
@@ -1,4 +1,4 @@
-<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Tutorial: Transforming input data · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/tutorials/tutorial-transform-spec.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.19.0" /><meta property="og:title" content="Tutorial: Transforming input data · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Tutorial: Transforming input data · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/tutorials/tutorial-transform-spec.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.20.0" /><meta property="og:title" content="Tutorial: Transforming input data · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
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@@ -205,6 +205,6 @@
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-                algoliaOptions: {"facetFilters":["language:en","version:0.19.0"]}
+                algoliaOptions: {"facetFilters":["language:en","version:0.20.0"]}
               });
             </script></body></html>
\ No newline at end of file
diff --git a/docs/latest/tutorials/tutorial-update-data.html b/docs/latest/tutorials/tutorial-update-data.html
index d096837..6510165 100644
--- a/docs/latest/tutorials/tutorial-update-data.html
+++ b/docs/latest/tutorials/tutorial-update-data.html
@@ -1,4 +1,4 @@
-<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Tutorial: Updating existing data · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/tutorials/tutorial-update-data.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.19.0" /><meta property="og:title" content="Tutorial: Updating existing data · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Tutorial: Updating existing data · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/tutorials/tutorial-update-data.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.20.0" /><meta property="og:title" content="Tutorial: Updating existing data · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
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               function gtag(){dataLayer.push(arguments); }
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@@ -193,6 +193,6 @@
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                 indexName: 'apache_druid',
                 inputSelector: '#search_input_react',
-                algoliaOptions: {"facetFilters":["language:en","version:0.19.0"]}
+                algoliaOptions: {"facetFilters":["language:en","version:0.20.0"]}
               });
             </script></body></html>
\ No newline at end of file
diff --git a/downloads.html b/downloads.html
index bbb4b4b..2192760 100644
--- a/downloads.html
+++ b/downloads.html
@@ -127,17 +127,17 @@
     <div class="col-md-10 col-md-offset-1">
       <h2 id="latest-release">Latest release</h2>
 
-<p>The latest Apache Druid stable release is 0.18.1.</p>
+<p>The latest Apache Druid stable release is 0.19.0.</p>
 
 <p>
-<a class="large-button download" href="https://www.apache.org/dyn/closer.cgi?path=/druid/0.18.1/apache-druid-0.18.1-bin.tar.gz" download onclick="trackDownload('button', 'https://www.apache.org/dyn/closer.cgi?path=/druid/0.18.1/apache-druid-0.18.1-bin.tar.gz');"><span class="fa fa-download"></span> Download 0.18.1 release</a><br>
+<a class="large-button download" href="https://www.apache.org/dyn/closer.cgi?path=/druid/0.19.0/apache-druid-0.19.0-bin.tar.gz" download onclick="trackDownload('button', 'https://www.apache.org/dyn/closer.cgi?path=/druid/0.19.0/apache-druid-0.19.0-bin.tar.gz');"><span class="fa fa-download"></span> Download 0.19.0 release</a><br>
 </p>
 
 <ul>
-<li>Release date: May 13 2020</li>
-<li>Binary download: <a href="https://www.apache.org/dyn/closer.cgi?path=/druid/0.18.1/apache-druid-0.18.1-bin.tar.gz">apache-druid-0.18.1-bin.tar.gz</a> (<a href="https://www.apache.org/dist/druid/0.18.1/apache-druid-0.18.1-bin.tar.gz.sha512">sha512</a>, <a href="https://www.apache.org/dist/druid/0.18.1/apache-druid-0.18.1-bin.tar.gz.asc">pgp</a>)</li>
-<li>Source download: <a href="https://www.apache.org/dyn/closer.cgi?path=/druid/0.18.1/apache-druid-0.18.1-src.tar.gz">apache-druid-0.18.1-src.tar.gz</a> (<a href="https://www.apache.org/dist/druid/0.18.1/apache-druid-0.18.1-src.tar.gz.sha512">sha512</a>, <a href="https://www.apache.org/dist/druid/0.18.1/apache-druid-0.18.1-src.tar.gz.asc">pgp</a>)</li>
-<li>Release notes: <a href="https://github.com/apache/druid/releases/tag/druid-0.18.1">0.18.1</a></li>
+<li>Release date: Jul 21 2020</li>
+<li>Binary download: <a href="https://www.apache.org/dyn/closer.cgi?path=/druid/0.19.0/apache-druid-0.19.0-bin.tar.gz">apache-druid-0.19.0-bin.tar.gz</a> (<a href="https://www.apache.org/dist/druid/0.19.0/apache-druid-0.19.0-bin.tar.gz.sha512">sha512</a>, <a href="https://www.apache.org/dist/druid/0.19.0/apache-druid-0.19.0-bin.tar.gz.asc">pgp</a>)</li>
+<li>Source download: <a href="https://www.apache.org/dyn/closer.cgi?path=/druid/0.19.0/apache-druid-0.19.0-src.tar.gz">apache-druid-0.19.0-src.tar.gz</a> (<a href="https://www.apache.org/dist/druid/0.19.0/apache-druid-0.19.0-src.tar.gz.sha512">sha512</a>, <a href="https://www.apache.org/dist/druid/0.19.0/apache-druid-0.19.0-src.tar.gz.asc">pgp</a>)</li>
+<li>Release notes: <a href="https://github.com/apache/druid/releases/tag/druid-0.19.0">0.19.0</a></li>
 </ul>
 
 <p>You should verify your download by following these <a href="https://www.apache.org/info/verification.html">procedures</a> and using these <a href="https://www.apache.org/dist/druid/KEYS">KEYS</a>.</p>
@@ -165,15 +165,15 @@
 
 <h2 id="older-releases">Older releases</h2>
 
-<p>The previous major release branch of Apache Druid was 0.17.</p>
+<p>The previous major release branch of Apache Druid was 0.18.</p>
 
-<h5 id="0-17-1">0.17.1</h5>
+<h5 id="0-18-1">0.18.1</h5>
 
 <ul>
-<li>Release date: Apr  1 2020</li>
-<li>Binary download: <a href="https://www.apache.org/dyn/closer.cgi?path=/druid/0.17.1/apache-druid-0.17.1-bin.tar.gz">apache-druid-0.17.1-bin.tar.gz</a> (<a href="https://www.apache.org/dist/druid/0.17.1/apache-druid-0.17.1-bin.tar.gz.sha512">sha512</a>, <a href="https://www.apache.org/dist/druid/0.17.1/apache-druid-0.17.1-bin.tar.gz.asc">pgp</a>)</li>
-<li>Source download: <a href="https://www.apache.org/dyn/closer.cgi?path=/druid/0.17.1/apache-druid-0.17.1-src.tar.gz">apache-druid-0.17.1-src.tar.gz</a> (<a href="https://www.apache.org/dist/druid/0.17.1/apache-druid-0.17.1-src.tar.gz.sha512">sha512</a>, <a href="https://www.apache.org/dist/druid/0.17.1/apache-druid-0.17.1-src.tar.gz.asc">pgp</a>)</li>
-<li>Release notes: <a href="https://github.com/apache/druid/releases/tag/druid-0.17.1">0.17.1</a></li>
+<li>Release date: May 13 2020</li>
+<li>Binary download: <a href="https://www.apache.org/dyn/closer.cgi?path=/druid/0.18.1/apache-druid-0.18.1-bin.tar.gz">apache-druid-0.18.1-bin.tar.gz</a> (<a href="https://www.apache.org/dist/druid/0.18.1/apache-druid-0.18.1-bin.tar.gz.sha512">sha512</a>, <a href="https://www.apache.org/dist/druid/0.18.1/apache-druid-0.18.1-bin.tar.gz.asc">pgp</a>)</li>
+<li>Source download: <a href="https://www.apache.org/dyn/closer.cgi?path=/druid/0.18.1/apache-druid-0.18.1-src.tar.gz">apache-druid-0.18.1-src.tar.gz</a> (<a href="https://www.apache.org/dist/druid/0.18.1/apache-druid-0.18.1-src.tar.gz.sha512">sha512</a>, <a href="https://www.apache.org/dist/druid/0.18.1/apache-druid-0.18.1-src.tar.gz.asc">pgp</a>)</li>
+<li>Release notes: <a href="https://github.com/apache/druid/releases/tag/druid-0.18.1">0.18.1</a></li>
 </ul>
 
 <p>All other releases of Apache Druid are available at the <a href="https://archive.apache.org/dist/druid/">Apache Druid release archives</a>.</p>
@@ -193,7 +193,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/druid-powered.html b/druid-powered.html
index 9f2f200..5bfba5c 100644
--- a/druid-powered.html
+++ b/druid-powered.html
@@ -159,6 +159,14 @@
 
 <p>Druid is used to power dynamic analytics and charting in Archive-It Reports. Reports help Archive-It partners understand what content they captured, why some content did not get captured, and assists with quality assurance and crawl scoping to ensure they are building the highest quality collections.</p>
 
+<h2 id="athena-health">Athena Health</h2>
+
+<p>At <a href="https://www.athenahealth.com/">Athena Health</a>, we are creating a new performance management application for our clients, and one of its key components is Apache Druid. </p>
+
+<ul>
+<li><a href="https://imply.io/virtual-druid-summit/automating-ci-cd-for-druid-clusters-at-athena-health">Automating CI/CD for Druid Clusters at Athena Health</a></li>
+</ul>
+
 <h2 id="atomx">Atomx</h2>
 
 <p>Atomx is a new media exchange that connects networks, DSPs, SSPs, and other parties. Atomx uses Druid for it&#39;s advanced realtime reporting system. Using the Google Cloud modifications Atomx contributed to Druid, it can easily scale Druid with the fast growing platform.</p>
@@ -167,6 +175,10 @@
 
 <p><a href="https://www.bannerflow.com">Bannerflow</a> is the leading display ad production platform. We use Druid to power our customer facing analytics system and for internal reporting, monitoring and ad-hoc data exploration.</p>
 
+<h2 id="bigo">BIGO</h2>
+
+<p>BIGO selects Druid as an OLAP engine to analyze app(Like, Bigolive, IMO, etc.) data in bigdata team. Typical analysis in Druid includes apm, A/B testing, push, funnel model, etc. Besides, Superset is used as dashboard for deep integration with Druid.</p>
+
 <h2 id="billy-mobile">Billy Mobile</h2>
 
 <p>Billy Mobile is a mobile advertising platform, excelling in the performance-based optimisation segment. We use Druid to power our real-time analytics dashboards, in which our publishers, advertisers and staff can get insights on how their campaigns, offers and traffic are performing, with sub-second query time and minute granularity . We are using a lambda-architecture aproach, ingesting the traffic in real time with Tranquility and Storm, and a batch layer via a tight integration with Hive and Hadoop, our Master Data Set. This way we can provide crucial fast access to data, while making sure to have the right numbers.</p>
@@ -181,6 +193,13 @@
 
 <p>Branch uses Druid as their trusted analytics engine to power all of their data analysis needs. This ranges from the user-facing Branch Dashboard analytics that our partners rely on to gain insight into the performance of their links; to the data-driven business decisions that we need to make internally to build a sustainable business.</p>
 
+<h2 id="british-telecom-bt">British Telecom (BT)</h2>
+
+<ul>
+<li><a href="https://imply.io/videos/british-telecoms-apache-druid-architecture">British Telecom&#39;s Apache Druid Architecture</a></li>
+<li><a href="https://imply.io/videos/why-british-telecom-chose-druid-over-cassandra">Why British Telecom Chose Druid Over Cassandra</a></li>
+</ul>
+
 <h2 id="central-bank-of-the-republic-of-turkey">Central Bank of the Republic of Turkey</h2>
 
 <p>The Central Bank of the Republic of Turkey addresses the challenge of analyzing and interpreting real-time tick data related to money market instruments using Apache Druid and Superset.</p>
@@ -211,6 +230,10 @@
 
 <p>Condé Nast uses Druid to track billions of events across our two dozen brands, both in real time and historically. Druid helps power dashboards, site performance trackers, and many other internal applications.</p>
 
+<h2 id="confluent">Confluent</h2>
+
+<p>Druid has helped push operational visibility to the next level. Operating multi-tenant services requires fine-grained visibility down to the individual tenant, user, or application behavior, where most traditional monitoring stacks fail to scale or become cost-prohibitive. Leveraging Druid as part of our stack means we don&#39;t shy away from high-cardinality data. As a result, our teams can not only quickly troubleshoot issues but also glean detailed understanding to help improve the product.  </p>
+
 <h2 id="contiamo">Contiamo</h2>
 
 <p><a href="https://www.contiamo.com">Contiamo</a> uses cutting edge technology to enable agile development and deployment of data-driven frontends and automations. Druid powers various dashboards and frontends that deal with large amounts of event based data.</p>
@@ -224,6 +247,14 @@
 <li><a href="http://labs.criteo.com/2016/02/real-time-metrics-on-tracker-calls/">Real Time Metrics on Tracker Calls</a></li>
 </ul>
 
+<h2 id="dbs-bank">DBS Bank</h2>
+
+<p><a href="https://www.dbs.com">DBS</a> is using Apache Druid to handle the AML investigation for the compliance team. The AML (anti-money laundering) workflow generates alerts which are tracked within Druid. The transactional data is ingested from RDBMS to S3 and ingested back to Druid at regular intervals. Investigators can now slice and dice over millions of data with low latency.</p>
+
+<ul>
+<li><a href="https://imply.io/virtual-druid-summit/apache-druid-anti-money-laundering-dbs-bank">Apache Druid for Anti-Money Laundering (AML) at DBS Bank</a></li>
+</ul>
+
 <h2 id="datumo">Datumo</h2>
 
 <p><a href="https://datumo.io/">Datumo</a> is a 100% remote Big Data software house from Poland. 
@@ -237,7 +268,9 @@
 
 <p>Our talk from FlinkForward conference in Berlin 2019:</p>
 
-<p><a href="https://medium.com/deep-bi/real-time-stream-analytics-and-user-scoring-using-apache-druid-flink-cassandra-at-deep-bi-38e5dc40958d?source=friends_link&sk=d9c85da0cb060280bfeb8f3c1c166e84">Real-time Stream Analytics and User Scoring Using Apache Druid, Flink &amp; Cassandra at Deep.BI</a></p>
+<ul>
+<li><a href="https://medium.com/deep-bi/real-time-stream-analytics-and-user-scoring-using-apache-druid-flink-cassandra-at-deep-bi-38e5dc40958d?source=friends_link&sk=d9c85da0cb060280bfeb8f3c1c166e84">Real-time Stream Analytics and User Scoring Using Apache Druid, Flink &amp; Cassandra at Deep.BI</a></li>
+</ul>
 
 <h2 id="delta-projects">Delta Projects</h2>
 
@@ -254,6 +287,7 @@
 
 <ul>
 <li><a href="https://medium.com/@D11Engg/data-highway-dream11s-inhouse-analytics-platform-the-burden-and-benefits-90b8777d282">Data Highway — Dream11’s Inhouse Analytics Platform — The Burden and Benefits</a></li>
+<li><a href="https://imply.io/post/real-time-analytics-for-fantasy-sports">Real-Time data and analytics for fantasy sports</a></li>
 </ul>
 
 <h2 id="dripstat">DripStat</h2>
@@ -315,6 +349,14 @@
 
 <p><a href="https://www.icsoc.net">ICSOC Co., Ltd.</a> is the leading call center service provider in China. In our big data department, as traditional ways cannot meet our requirements, eventually we found that Druid, designed in lambda, fully satisfies our requires. It simplified developing statistics or real-time products and highly speeded up OLAP queries.</p>
 
+<h2 id="ibotta">Ibotta</h2>
+
+<p><a href="https://home.ibotta.com/">Ibotta</a> is a free cash back rewards and payments app. The company has partnered with more than 1,500 brands and retailers to pay consumers cash for their purchases. Ibotta has paid out over $600 million in cash rewards to more than 35 million users since its founding in 2012.</p>
+
+<ul>
+<li><a href="https://imply.io/post/combating-fraud-at-ibotta-with-imply">Combatting fraud at Ibotta with Imply</a></li>
+</ul>
+
 <h2 id="imply">Imply</h2>
 
 <p>Imply uses Druid to power public demos and to power our internal monitoring and metrics.</p>
@@ -337,6 +379,14 @@
 
 <p>Inmobi is a mobile advertising and discovery platform. We use Druid majorly for internal realtime reporting and analysis. We also use Caravel backed by Druid, which allows users to build interactive dashboards. Apart from that, we use Druid as a Datastore for faster ingestion of large amount of data and to query this data at sub second latencies.</p>
 
+<h2 id="innowatts">Innowatts</h2>
+
+<p>Innowatts uses Druid to quickly work with massive data sets, and differentiates its platform with the intended direction to read meters and forecast usage on the fly.</p>
+
+<ul>
+<li><a href="https://imply.io/post/innowatts-innovates-power-utilities-analytics">Innowatts provides AI-driven analytics for the power industry</a></li>
+</ul>
+
 <h2 id="interactive-intelligence">Interactive Intelligence</h2>
 
 <p>At ININ we&#39;re using Druid within a Lambda architecture to drive cloud based call center analytics. Many of our realtime dashboards, downloadable reports, and public APIs utilize Druid on the backend.</p>
@@ -356,6 +406,15 @@
 <li><a href="https://www.linkedin.com/pulse/realtime-analytics-powered-druid-kiran-patchigolla">Realtime Analytics Powered by Druid</a></li>
 </ul>
 
+<h2 id="kering">Kering</h2>
+
+<p>Thanks to Druid, Kering empowers its sales teams (more than 20,000 people worldwide) to quickly understand their sales performance, compare them to their objectives and identify new sales opportunities within their customer portfolio.<br>
+Kering was already providing data on demand via a search engine (Apache Solr), and the implementation of Apache Druid has enabled us to enrich the offer by :
+- Adding access to real-time updated KPIs (based on streaming ingestion)
+- Providing a sub-second response time
+- Offering linear scalability that allows the service to be deployed to tens of thousands of end users
+- Allowing massive data updates in a very short period of time (using parquet and mapReduce files) without any impact on the quality of service</p>
+
 <h2 id="kt-nexr">KT NexR</h2>
 
 <p>KT NexR is the leading provider of the data analytics platform. We use Druid as a real-time analysis tool to help our customers to analyze multidimensional data in interactive ways.</p>
@@ -391,6 +450,10 @@
 <li><a href="https://medium.com/makemytrip-engineering/data-insights-engine-makemytrip-900bd353d99c">Data Insights Engine @ MakeMyTrip</a></li>
 </ul>
 
+<h2 id="makesens">MAKESENS</h2>
+
+<p><a href="http://www.battery-doctor.cn/">MAKESENS</a> use Druid to store and analyze battery data.</p>
+
 <h2 id="marchex">Marchex</h2>
 
 <p>Marchex uses Druid to provide data for Marchex Call Analytics&#39; new customer facing Speech Analytics dashboards.
@@ -563,6 +626,10 @@
 <li><a href="https://plumbr.eu/blog/programming/storing-and-querying-trillions-of-events">Storing and accessing trillions of events</a></li>
 </ul>
 
+<h2 id="pollfish">Pollfish</h2>
+
+<p>The <a href="https://www.pollfish.com/">Pollfish</a> real-time analytics platform enables researchers to analyze survey data from over half-a-billion consumers across the world, informing advertising, branding, market research, content, and product strategies. Druid is used alongside Apache Kafka, Spark, Flink, Akka Streams, Finatra / Finagle microservices, Cassandra, PostgreSQL, Hive, and Scruid – an open source Scala library for Apache Druid.</p>
+
 <h2 id="pubnative">PubNative</h2>
 
 <p>PubNative uses Druid for its real-time reports and analysis of millions of daily ad views, clicks, conversions and other events.</p>
@@ -579,6 +646,14 @@
 <li><a href="https://raygun.com/blog/2016/12/druid-groupby-v2-engine/">Using the Druid GroupBy V2 engine for real-time analytics</a></li>
 </ul>
 
+<h2 id="razorpay">Razorpay</h2>
+
+<p>We have successfully deployed Druid at <a href="https://razorpay.com/">Razorpay</a> for our use cases and see continued growth in its footprint. We were able to achieve p90, p95 values of less than 5s and 10s respectively and our dashboard performances have improved by at least 10x when compared to Presto.</p>
+
+<ul>
+<li><a href="https://medium.com/@birendra.sahu_77409/how-razorpay-uses-druid-for-seamless-analytics-and-product-insights-364c01b87f1e">How Razorpay uses Druid for seamless analytics and product insights?</a></li>
+</ul>
+
 <h2 id="redborder">Redborder</h2>
 
 <p>redBorder is an open source, scale out, cybersecurity analytics platform based on Druid. We hope its full-blown web interface, dashboard and report systems, and ready-to-use real-time pipeline foster other Druid users to create a strong community around it. To see more, please visit redborder.org</p>
@@ -587,6 +662,10 @@
 
 <p>Retargetly is a Data Management Platform that enables publishers and advertisers to manage their first party user data, mix it with second and third party data from others providers and activate it into advertising campaigns (direct, programmatic, etc.). Druid enables us to show real time audience insights. It also provides a lot of flexibility on ad-hoc queries with low latency. We provide default graphs and metrics to our clients but they also have the possibility to make their own interactive queries on real-time.</p>
 
+<h2 id="sage-archer">Sage + Archer</h2>
+
+<p>We are using Druid as our single source of truth for both realtime statistics and data analysis. Our clients can see and filter detailed metrics in our <a href="https://www.sage-archer.com">self-service DSP</a>. The DSP is used for mobile and digital-out-of-home advertising campaigns. Druid is powering both the front-end and the optimization algorithms within the system.</p>
+
 <h2 id="sift-science">Sift Science</h2>
 
 <p>Sift Science provides an online trust platform that online businesses use to prevent fraud and abuse. We use Druid as a tool to gain real-time insights about our data and machine learning models.</p>
@@ -656,6 +735,15 @@
 
 <p>Sugo is a company that focus on realtime multi-dimension analytics and mining on big data. We build our platform based on Druid, and developed our own extensions to make it more powerful.</p>
 
+<h2 id="superawesome">SuperAwesome</h2>
+
+<p><a href="https://www.superawesome.com">SuperAwesome</a>’s mission is to make the internet safer for kids. At the core of SuperAwesome’s analytics is Apache Druid, which helps us relay key insights and data points back to our stakeholders and customers, as well as use this data to power our products themselves. This all happens in a kid-safe way and enables us to deliver the best level of service to billions of children and teens every month.</p>
+
+<ul>
+<li><a href="https://medium.com/superawesome-engineering/how-we-use-apache-druids-real-time-analytics-to-power-kidtech-at-superawesome-8da6a0fb28b1">How we use Apache Druid’s real-time analytics to power kidtech at SuperAwesome</a></li>
+<li><a href="https://imply.io/videos/virtual-apache-druid-meetup-featuring-superswesome">Virtual Apache Druid Meetup featuring SuperAwesome</a></li>
+</ul>
+
 <h2 id="sweet-couch">Sweet Couch</h2>
 
 <p><a href="https://www.sweetcouch.com">Sweet Couch</a> is a place to discover unique products which are buyable online. Druid powers <a href="https://www.sweetcouch.com/harvest/womens">Sweet Couch harvest</a> which is an open analytics platform for tracking performance of online shops based out in India. All end user events are tracked and analysed using Druid for business insights.</p>
@@ -664,6 +752,14 @@
 
 <p><a href="http://www.talkingdata.com/">TalkingData</a> is China’s largest independent Big Data service platform. TalkingData uses Druid with Atomcube, an extension for enhancement, to power analyze online application and advertising data.</p>
 
+<h2 id="target">Target</h2>
+
+<p>Apache Druid’s speed and flexibility allow us to provide interactive analytics to front-line, edge-of-business consumers to address hundreds of unique use-cases across several business units.</p>
+
+<ul>
+<li><a href="https://imply.io/virtual-druid-summit/enterprise-scale-analytics-platform-powered-by-druid-at-target">Enterprise Scale Analytics Platform Powered by Druid at Target</a> </li>
+</ul>
+
 <h2 id="tencent">Tencent</h2>
 
 <p>Tencent SCRM product use Druid for customer behavior analysis.</p>
@@ -697,12 +793,28 @@
 
 <p>TripleLift uses Druid to provide insights into performance aspects of its native programmatic exchange for sales/business development opportunities, and to provide reporting used by advertisers and publishers.</p>
 
+<h2 id="twitch">Twitch</h2>
+
+<p>In order to continue empowering decision making as Twitch scaled, we turned to using Druid and Imply to provide self service analytics to both our technical and non technical staff allowing them to drill into high level metrics in lieu of reading generated reports.</p>
+
+<ul>
+<li><a href="https://imply.io/virtual-druid-summit/self-service-analytics-at-twitch">Self Service Analytics at Twitch</a></li>
+</ul>
+
 <h2 id="twitter">Twitter</h2>
 
 <ul>
 <li><a href="https://blog.twitter.com/engineering/en_us/topics/infrastructure/2019/interactive-analytics-at-mopub.html">Interactive Analytics at MoPub: Querying Terabytes of Data in Seconds</a></li>
 </ul>
 
+<h2 id="unity">Unity</h2>
+
+<p>Unity&#39;s monetization business generates billions of in-game events in a multi-sided marketplace, which creates complexity, slowness, and overhead for reporting. To work around these issues, Unity deploys a Kafka, Spark, and Druid-based ingestion and aggregation pipeline.</p>
+
+<ul>
+<li><a href="https://medium.com/@linda0511ny/getting-started-with-druid-imply-17d194762574">Getting Started with Druid (Imply)</a></li>
+</ul>
+
 <h2 id="videoamp">VideoAmp</h2>
 
 <p>At VideoAmp, Druid is a key component of our Big Data stack. It powers our real-time video advertising analytics at low granularity and huge scale. Druid has helped us minimized the time between event, insight and action.</p>
@@ -786,6 +898,10 @@
 
 <p><a href="https://www.zhihu.com/">Zhihu</a> is a Chinese question-and-answer website. In Zhihu, Druid is used to power clients&#39; interactive queries, data reports, A/B testing and performance monitoring. Almost 1T per day data is ingested into druid cluster, and we are strongly depending on thetaSketch aggregator for computing cardinality and retention, looking forward to more improvement on DataSketch.</p>
 
+<h2 id="zilingo">Zilingo</h2>
+
+<p>Zilingo&#39;s data collection infrastructure, processing pipeline and analytics stack is based on Druid. Data is collected from various IOT devices/sensors, mobile and tablet devices and 3p data and is streamed in near realtime. This allows our customers to get a view of the supply chain with thousands of data points via dashboards, reports and the ability to slice and dice data.</p>
+
 <h2 id="zscaler">Zscaler</h2>
 
 <ul>
@@ -796,10 +912,6 @@
 
 <p><a href="http://www.zuoyebang.com/">Zuoyebang</a> is the most used K12 education platform, 7 out of every 10 K12 users are using Zuoyebang. At Zuoyebang Data Platform Group, we use the Druid in the advertising scene,  mainly related to advertising display, click, billing, and other functions. The performance and timeliness of druid can meet our OLAP queries very well.</p>
 
-<h2 id="bigo">BIGO</h2>
-
-<p>BIGO selects Druid as an OLAP engine to analyze app(Like, Bigolive, IMO, etc.) data in bigdata team. Typical analysis in Druid includes apm, A/B testing, push, funnel model, etc. Besides, Superset is used as dashboard for deep integration with Druid.</p>
-
 <p><a href="https://github.com/apache/druid-website-src/blob/master/druid-powered.md">Add Your Company</a></p>
 
     </div>
@@ -815,7 +927,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/druid.html b/druid.html
index 09127fd..05ef120 100644
--- a/druid.html
+++ b/druid.html
@@ -225,7 +225,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/faq.html b/faq.html
index d0cacfd..0698ef5 100644
--- a/faq.html
+++ b/faq.html
@@ -118,7 +118,7 @@
     <div class="druid-header">
   <div class="container">
     <h1>Frequently Asked Questions</h1>
-    <h4>Don't see your question here? <a href='/community'>Ask us</a></h4>
+    <h4>Don't see your question here? <a href='/community/'>Ask us</a></h4>
   </div>
 </div>
 
@@ -139,7 +139,7 @@
 <ul>
 <li>Much lower latency for OLAP-style queries</li>
 <li>Much lower latency for data ingest (both streaming and batch)</li>
-<li>Out-of-the-box integration with Apache Kakfa, AWS Kinesis, HDFS, AWS S3, and more</li>
+<li>Out-of-the-box integration with Apache Kafka, AWS Kinesis, HDFS, AWS S3, and more</li>
 <li>Time-based partitioning, which enables performant time-based queries</li>
 <li>Fast search and filter, for fast slice and dice</li>
 <li>Minimal schema design and native support for semi-structured and nested data</li>
@@ -245,7 +245,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/index.html b/index.html
index e8d9ba0..9e35cc2 100644
--- a/index.html
+++ b/index.html
@@ -155,7 +155,7 @@
           <span class="fa fa-lightbulb fa"></span>
           <h5>Up to 100x faster than traditional solutions</h5>
           <p>
-            Druid has been <a href='https://imply.io/post/performance-benchmark-druid-presto-hive'>benchmarked</a> to greatly outpeform legacy solutions for data ingestion and data querying. Druid's novel architecture combines the best of <a href='https://en.wikipedia.org/wiki/Data_warehouse'>data warehouses</a>, <a href='https://en.wikipedia.org/wiki/Time_series_database'>timeseries databases</a>, and <a href='https://en.wikipedia.org/wiki/Search_engine_(computing)'>search systems</a>.
+            Druid has been <a href='https://imply.io/post/performance-benchmark-druid-presto-hive'>benchmarked</a> to greatly outperform legacy solutions for data ingestion and data querying. Druid's novel architecture combines the best of <a href='https://en.wikipedia.org/wiki/Data_warehouse'>data warehouses</a>, <a href='https://en.wikipedia.org/wiki/Time_series_database'>timeseries databases</a>, and <a href='https://en.wikipedia.org/wiki/Search_engine_(computing)'>search systems</a>.
           </p>
         </div>
         <div class="feature">
@@ -203,7 +203,7 @@
           <span class="fa fa-question-circle fa"></span>
           <h5>Get Help</h5>
           <p>
-            Get help from a <a href='/community'>wide network of community members</a> about using Druid.
+            Get help from a <a href='/community/'>wide network of community members</a> about using Druid.
           </p>
         </div>
       </div>
@@ -221,16 +221,16 @@
   <div class="event">
     <div class="mini-cal">
       <div class="date-month">
-        Jul
+        Oct
       </div>
       <div class="date-day">
-        16
+         7
       </div>
     </div>
     <p>
-      <a href="https://www.meetup.com/druidio/events/271670002/">
-        <span class ="title">Benchmarking Apache Druid</span><br>
-        <span class="text-muted">Bay Area Apache Druid Meetup by Imply</span>
+      <a href="https://go.imply.io/Virtual-Druid-Summit-III-Registration.html">
+        <span class ="title">Virtual Druid Summit III</span><br>
+        <span class="text-muted">A free half-day online event.</span>
       </a>
     </p>
   </div>
@@ -238,16 +238,50 @@
   <div class="event">
     <div class="mini-cal">
       <div class="date-month">
-        Jul
+        Oct
+      </div>
+      <div class="date-day">
+        19
+      </div>
+    </div>
+    <p>
+      <a href="https://www.meetup.com/druidio/events/273666882">
+        <span class ="title">October Office Hours: All About Apache Druid</span><br>
+        <span class="text-muted">Bay Area Druid Meetup</span>
+      </a>
+    </p>
+  </div>
+  
+  <div class="event">
+    <div class="mini-cal">
+      <div class="date-month">
+        Oct
+      </div>
+      <div class="date-day">
+        20
+      </div>
+    </div>
+    <p>
+      <a href="https://www.eventbrite.com/e/all-things-open-2020-tickets-112261031768">
+        <span class ="title">Apache Druid: Why Speed in Analytics Matters</span><br>
+        <span class="text-muted">All Things Open</span>
+      </a>
+    </p>
+  </div>
+  
+  <div class="event">
+    <div class="mini-cal">
+      <div class="date-month">
+        Oct
       </div>
       <div class="date-day">
         23
       </div>
     </div>
     <p>
-      <a href="https://www.meetup.com/druidio/events/271672988/">
-        <span class ="title">Virtual Apache Druid AGA (Ask Gian Anything) / July Office Hours</span><br>
-        <span class="text-muted">Bay Area Apache Druid Meetup by Imply</span>
+      <a href="https://www.dataconla.com/registration/">
+        <span class ="title">Apache Druid 1010</span><br>
+        <span class="text-muted">Data Con LA</span>
       </a>
     </p>
   </div>
@@ -255,33 +289,16 @@
   <div class="event">
     <div class="mini-cal">
       <div class="date-month">
-        Jul
+        Oct
       </div>
       <div class="date-day">
-        30
+        28
       </div>
     </div>
     <p>
-      <a href="https://www.meetup.com/Apache-Druid-London/events/271166791/">
-        <span class ="title">Virtual Apache Druid Meetup featuring SuperAwesome</span><br>
-        <span class="text-muted">London Apache Druid Meetup by Imply</span>
-      </a>
-    </p>
-  </div>
-  
-  <div class="event">
-    <div class="mini-cal">
-      <div class="date-month">
-        Nov
-      </div>
-      <div class="date-day">
-         2
-      </div>
-    </div>
-    <p>
-      <a href="https://druidsummit.org/">
-        <span class ="title">Druid Summit</span><br>
-        <span class="text-muted">San Francisco Airport Marriott Waterfront, 1800 Old Bayshore Highway, Burlingame, CA</span>
+      <a href="https://www.meetup.com/Apache-Druid-London/events/273589627/">
+        <span class ="title">SuperAwesome Returns for a SuperAwesome Apache Druid Meetup!</span><br>
+        <span class="text-muted">London Apache Druid Meetup</span>
       </a>
     </p>
   </div>
@@ -357,9 +374,9 @@
   
   
   <p>
-    <a href="https://github.com/apache/druid/releases/tag/druid-0.18.1">
-      <span class="title">Apache Druid 0.18.1 Released</span><br>
-      <span class="text-muted">May 13 2020</span>
+    <a href="https://github.com/apache/druid/releases/tag/druid-0.19.0">
+      <span class="title">Apache Druid 0.19.0 Released</span><br>
+      <span class="text-muted">Jul 21 2020</span>
     </a>
   </p>
   
@@ -371,9 +388,9 @@
   
   
   <p>
-    <a href="https://github.com/apache/druid/releases/tag/druid-0.17.1">
-      <span class="title">Apache Druid 0.17.1 Released</span><br>
-      <span class="text-muted">Apr  1 2020</span>
+    <a href="https://github.com/apache/druid/releases/tag/druid-0.18.1">
+      <span class="title">Apache Druid 0.18.1 Released</span><br>
+      <span class="text-muted">May 13 2020</span>
     </a>
   </p>
   
@@ -398,7 +415,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/libraries.html b/libraries.html
index fa110bd..331600e 100644
--- a/libraries.html
+++ b/libraries.html
@@ -201,6 +201,12 @@
 <li><a href="https://github.com/MindscapeHQ/druid4net">raygun/druid4net</a> - A .NET client for Druid written in C#. Supports the .NET full framework and .NET Core.</li>
 </ul>
 
+<h4 id="rust">Rust</h4>
+
+<ul>
+<li><a href="https://github.com/bugzmanov/druid-io-rs">bugzmanov/druid-io-rs</a> - Fully asynchronous, future-enabled Apache Druid client library for rust programming language.</li>
+</ul>
+
 <h2 id="other-druid-distributions">Other Druid Distributions</h2>
 
 <ul>
@@ -255,7 +261,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/licensing.html b/licensing.html
index 925de81..70fc400 100644
--- a/licensing.html
+++ b/licensing.html
@@ -172,7 +172,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/technology.html b/technology.html
index 73c41db..19c3de0 100644
--- a/technology.html
+++ b/technology.html
@@ -301,7 +301,7 @@
   </div>
 </div>
 
-<p>For more information, please visit <a href="/docs/latest/operations/recommendations.html">our docs page</a>.</p>
+<p>For more information, please visit <a href="/docs/latest/operations/basic-cluster-tuning.html">our docs page</a>.</p>
 
     </div>
   </div>
@@ -316,7 +316,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/thanks.html b/thanks.html
index 6c6cdcf..c925593 100644
--- a/thanks.html
+++ b/thanks.html
@@ -147,7 +147,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
diff --git a/use-cases.html b/use-cases.html
index 4a0214e..287a849 100644
--- a/use-cases.html
+++ b/use-cases.html
@@ -266,7 +266,7 @@
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
-    <a href="/docs/latest">Docs</a>&ensp;·&ensp;
+    <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>