[maven-release-plugin] prepare release kylin-2.6.4
diff --git a/assembly/pom.xml b/assembly/pom.xml
index 1113eb5..ea79a24 100644
--- a/assembly/pom.xml
+++ b/assembly/pom.xml
@@ -26,7 +26,7 @@
     <parent>
         <artifactId>kylin</artifactId>
         <groupId>org.apache.kylin</groupId>
-        <version>2.6.5-SNAPSHOT</version>
+        <version>2.6.4</version>
     </parent>
 
     <properties>
diff --git a/cache/pom.xml b/cache/pom.xml
index 2f698e4..a6d73d3 100644
--- a/cache/pom.xml
+++ b/cache/pom.xml
@@ -26,7 +26,7 @@
     <parent>
         <groupId>org.apache.kylin</groupId>
         <artifactId>kylin</artifactId>
-        <version>2.6.5-SNAPSHOT</version>
+        <version>2.6.4</version>
     </parent>
 
     <dependencies>
diff --git a/core-common/pom.xml b/core-common/pom.xml
index 8438eb6..7c96559 100644
--- a/core-common/pom.xml
+++ b/core-common/pom.xml
@@ -28,7 +28,7 @@
     <parent>
         <groupId>org.apache.kylin</groupId>
         <artifactId>kylin</artifactId>
-        <version>2.6.5-SNAPSHOT</version>
+        <version>2.6.4</version>
     </parent>
 
     <dependencies>
diff --git a/core-cube/pom.xml b/core-cube/pom.xml
index a710206..659a061 100644
--- a/core-cube/pom.xml
+++ b/core-cube/pom.xml
@@ -28,7 +28,7 @@
     <parent>
         <groupId>org.apache.kylin</groupId>
         <artifactId>kylin</artifactId>
-        <version>2.6.5-SNAPSHOT</version>
+        <version>2.6.4</version>
     </parent>
 
     <dependencies>
diff --git a/core-dictionary/pom.xml b/core-dictionary/pom.xml
index 3e60a07..5271b1b 100644
--- a/core-dictionary/pom.xml
+++ b/core-dictionary/pom.xml
@@ -28,7 +28,7 @@
     <parent>
         <groupId>org.apache.kylin</groupId>
         <artifactId>kylin</artifactId>
-        <version>2.6.5-SNAPSHOT</version>
+        <version>2.6.4</version>
     </parent>
 
     <dependencies>
diff --git a/core-job/pom.xml b/core-job/pom.xml
index edffa25..37f44e6 100644
--- a/core-job/pom.xml
+++ b/core-job/pom.xml
@@ -28,7 +28,7 @@
     <parent>
         <groupId>org.apache.kylin</groupId>
         <artifactId>kylin</artifactId>
-        <version>2.6.5-SNAPSHOT</version>
+        <version>2.6.4</version>
     </parent>
 
     <dependencies>
diff --git a/core-metadata/pom.xml b/core-metadata/pom.xml
index 80bcd5c..6c3b5bb 100644
--- a/core-metadata/pom.xml
+++ b/core-metadata/pom.xml
@@ -28,7 +28,7 @@
     <parent>
         <groupId>org.apache.kylin</groupId>
         <artifactId>kylin</artifactId>
-        <version>2.6.5-SNAPSHOT</version>
+        <version>2.6.4</version>
     </parent>
 
     <dependencies>
diff --git a/core-metrics/pom.xml b/core-metrics/pom.xml
index 53561e6..be843b3 100644
--- a/core-metrics/pom.xml
+++ b/core-metrics/pom.xml
@@ -28,7 +28,7 @@
     <parent>
         <artifactId>kylin</artifactId>
         <groupId>org.apache.kylin</groupId>
-        <version>2.6.5-SNAPSHOT</version>
+        <version>2.6.4</version>
     </parent>
 
     <dependencies>
diff --git a/core-storage/pom.xml b/core-storage/pom.xml
index 682f268..326f8c8 100644
--- a/core-storage/pom.xml
+++ b/core-storage/pom.xml
@@ -28,7 +28,7 @@
     <parent>
         <groupId>org.apache.kylin</groupId>
         <artifactId>kylin</artifactId>
-        <version>2.6.5-SNAPSHOT</version>
+        <version>2.6.4</version>
     </parent>
 
     <dependencies>
diff --git a/datasource-sdk/pom.xml b/datasource-sdk/pom.xml
index d9e7275..c3ee941 100644
--- a/datasource-sdk/pom.xml
+++ b/datasource-sdk/pom.xml
@@ -26,7 +26,7 @@
     <parent>
         <groupId>org.apache.kylin</groupId>
         <artifactId>kylin</artifactId>
-        <version>2.6.5-SNAPSHOT</version>
+        <version>2.6.4</version>
     </parent>
 
     <dependencies>
diff --git a/engine-mr/pom.xml b/engine-mr/pom.xml
index 8451dd3..1154420 100644
--- a/engine-mr/pom.xml
+++ b/engine-mr/pom.xml
@@ -28,7 +28,7 @@
     <parent>
         <groupId>org.apache.kylin</groupId>
         <artifactId>kylin</artifactId>
-        <version>2.6.5-SNAPSHOT</version>
+        <version>2.6.4</version>
     </parent>
 
     <dependencies>
diff --git a/engine-spark/pom.xml b/engine-spark/pom.xml
index c28bd11..e6157c5 100644
--- a/engine-spark/pom.xml
+++ b/engine-spark/pom.xml
@@ -28,7 +28,7 @@
     <parent>
         <groupId>org.apache.kylin</groupId>
         <artifactId>kylin</artifactId>
-        <version>2.6.5-SNAPSHOT</version>
+        <version>2.6.4</version>
     </parent>
 
     <dependencies>
diff --git a/jdbc/pom.xml b/jdbc/pom.xml
index d49e5cd..f2363f9 100644
--- a/jdbc/pom.xml
+++ b/jdbc/pom.xml
@@ -28,7 +28,7 @@
     <parent>
         <groupId>org.apache.kylin</groupId>
         <artifactId>kylin</artifactId>
-        <version>2.6.5-SNAPSHOT</version>
+        <version>2.6.4</version>
     </parent>
 
     <properties>
diff --git a/kylin-it/pom.xml b/kylin-it/pom.xml
index 1dc0e2d..9ab421c 100644
--- a/kylin-it/pom.xml
+++ b/kylin-it/pom.xml
@@ -29,7 +29,7 @@
     <parent>
         <artifactId>kylin</artifactId>
         <groupId>org.apache.kylin</groupId>
-        <version>2.6.5-SNAPSHOT</version>
+        <version>2.6.4</version>
     </parent>
 
     <properties>
diff --git a/metrics-reporter-hive/pom.xml b/metrics-reporter-hive/pom.xml
index 427cd93..5735f73 100644
--- a/metrics-reporter-hive/pom.xml
+++ b/metrics-reporter-hive/pom.xml
@@ -28,7 +28,7 @@
     <parent>
         <artifactId>kylin</artifactId>
         <groupId>org.apache.kylin</groupId>
-        <version>2.6.5-SNAPSHOT</version>
+        <version>2.6.4</version>
     </parent>
 
     <dependencies>
diff --git a/metrics-reporter-kafka/pom.xml b/metrics-reporter-kafka/pom.xml
index 8861bc1..4f4fe0c 100644
--- a/metrics-reporter-kafka/pom.xml
+++ b/metrics-reporter-kafka/pom.xml
@@ -28,7 +28,7 @@
     <parent>
         <artifactId>kylin</artifactId>
         <groupId>org.apache.kylin</groupId>
-        <version>2.6.5-SNAPSHOT</version>
+        <version>2.6.4</version>
     </parent>
 
     <dependencies>
diff --git a/pom.xml b/pom.xml
index 6e4f178..6552763 100644
--- a/pom.xml
+++ b/pom.xml
@@ -30,7 +30,7 @@
   <groupId>org.apache.kylin</groupId>
   <artifactId>kylin</artifactId>
   <packaging>pom</packaging>
-  <version>2.6.5-SNAPSHOT</version>
+  <version>2.6.4</version>
 
   <name>Apache Kylin</name>
   <url>http://kylin.apache.org</url>
@@ -207,7 +207,7 @@
     <developerConnection>scm:git:ssh://git@github.com/apache/kylin.git
     </developerConnection>
     <url>https://github.com/apache/kylin</url>
-    <tag>HEAD</tag>
+    <tag>kylin-2.6.4</tag>
   </scm>
 
   <dependencyManagement>
diff --git a/query/pom.xml b/query/pom.xml
index a7a5c73..3bf92d4 100644
--- a/query/pom.xml
+++ b/query/pom.xml
@@ -28,7 +28,7 @@
     <parent>
         <groupId>org.apache.kylin</groupId>
         <artifactId>kylin</artifactId>
-        <version>2.6.5-SNAPSHOT</version>
+        <version>2.6.4</version>
     </parent>
 
     <dependencies>
diff --git a/server-base/pom.xml b/server-base/pom.xml
index 4a02c84..37a5d21 100644
--- a/server-base/pom.xml
+++ b/server-base/pom.xml
@@ -28,7 +28,7 @@
     <parent>
         <groupId>org.apache.kylin</groupId>
         <artifactId>kylin</artifactId>
-        <version>2.6.5-SNAPSHOT</version>
+        <version>2.6.4</version>
     </parent>
 
     <dependencies>
diff --git a/server/pom.xml b/server/pom.xml
index b1aeb95..a7cc3e0 100644
--- a/server/pom.xml
+++ b/server/pom.xml
@@ -28,7 +28,7 @@
     <parent>
         <groupId>org.apache.kylin</groupId>
         <artifactId>kylin</artifactId>
-        <version>2.6.5-SNAPSHOT</version>
+        <version>2.6.4</version>
     </parent>
 
     <dependencies>
diff --git a/source-hive/pom.xml b/source-hive/pom.xml
index ae00b94..b50ab59 100644
--- a/source-hive/pom.xml
+++ b/source-hive/pom.xml
@@ -28,7 +28,7 @@
     <parent>
         <groupId>org.apache.kylin</groupId>
         <artifactId>kylin</artifactId>
-        <version>2.6.5-SNAPSHOT</version>
+        <version>2.6.4</version>
     </parent>
 
     <dependencies>
diff --git a/source-jdbc/pom.xml b/source-jdbc/pom.xml
index dfca95a..4ba9edc 100644
--- a/source-jdbc/pom.xml
+++ b/source-jdbc/pom.xml
@@ -28,7 +28,7 @@
     <parent>
         <groupId>org.apache.kylin</groupId>
         <artifactId>kylin</artifactId>
-        <version>2.6.5-SNAPSHOT</version>
+        <version>2.6.4</version>
     </parent>
 
     <dependencies>
diff --git a/source-kafka/pom.xml b/source-kafka/pom.xml
index d7f043f..68dff41 100644
--- a/source-kafka/pom.xml
+++ b/source-kafka/pom.xml
@@ -28,7 +28,7 @@
     <parent>
         <groupId>org.apache.kylin</groupId>
         <artifactId>kylin</artifactId>
-        <version>2.6.5-SNAPSHOT</version>
+        <version>2.6.4</version>
     </parent>
 
     <dependencies>
diff --git a/storage-hbase/pom.xml b/storage-hbase/pom.xml
index d8c577d..d6f2f6a 100644
--- a/storage-hbase/pom.xml
+++ b/storage-hbase/pom.xml
@@ -28,7 +28,7 @@
     <parent>
         <groupId>org.apache.kylin</groupId>
         <artifactId>kylin</artifactId>
-        <version>2.6.5-SNAPSHOT</version>
+        <version>2.6.4</version>
     </parent>
 
     <properties>
diff --git a/tomcat-ext/pom.xml b/tomcat-ext/pom.xml
index 7052034..6596215 100644
--- a/tomcat-ext/pom.xml
+++ b/tomcat-ext/pom.xml
@@ -28,7 +28,7 @@
     <parent>
         <groupId>org.apache.kylin</groupId>
         <artifactId>kylin</artifactId>
-        <version>2.6.5-SNAPSHOT</version>
+        <version>2.6.4</version>
     </parent>
 
     <dependencies>
diff --git a/tool-assembly/pom.xml b/tool-assembly/pom.xml
index 1804552..0822a07 100644
--- a/tool-assembly/pom.xml
+++ b/tool-assembly/pom.xml
@@ -28,7 +28,7 @@
     <parent>
         <artifactId>kylin</artifactId>
         <groupId>org.apache.kylin</groupId>
-        <version>2.6.5-SNAPSHOT</version>
+        <version>2.6.4</version>
     </parent>
 
     <properties>
diff --git a/tool/pom.xml b/tool/pom.xml
index 540177e..b15ad6b 100644
--- a/tool/pom.xml
+++ b/tool/pom.xml
@@ -28,7 +28,7 @@
     <parent>
         <artifactId>kylin</artifactId>
         <groupId>org.apache.kylin</groupId>
-        <version>2.6.5-SNAPSHOT</version>
+        <version>2.6.4</version>
     </parent>
 
     <properties>