docs/0.14.1-incubating/ingestion/locking-and-priority.html - druid-website - Git at Google

 <!DOCTYPE html>
 <html lang="en">
   <head>
     <meta charset="UTF-8" />
 <meta name="viewport" content="width=device-width, initial-scale=1.0">
 <meta name="description" content="Apache Druid">
 <meta name="keywords" content="druid,kafka,database,analytics,streaming,real-time,real time,apache,open source">
 <meta name="author" content="Apache Software Foundation">

 <title>Druid | Task Locking & Priority</title>

 <link rel="alternate" type="application/atom+xml" href="/feed">
 <link rel="shortcut icon" href="/img/favicon.png">

 <link rel="stylesheet" href="https://use.fontawesome.com/releases/v5.7.2/css/all.css" integrity="sha384-fnmOCqbTlWIlj8LyTjo7mOUStjsKC4pOpQbqyi7RrhN7udi9RwhKkMHpvLbHG9Sr" crossorigin="anonymous">

 <link href='//fonts.googleapis.com/css?family=Open+Sans+Condensed:300,700,300italic|Open+Sans:300italic,400italic,600italic,400,300,600,700' rel='stylesheet' type='text/css'>

 <link rel="stylesheet" href="/css/bootstrap-pure.css?v=1.1">
 <link rel="stylesheet" href="/css/base.css?v=1.1">
 <link rel="stylesheet" href="/css/header.css?v=1.1">
 <link rel="stylesheet" href="/css/footer.css?v=1.1">
 <link rel="stylesheet" href="/css/syntax.css?v=1.1">
 <link rel="stylesheet" href="/css/docs.css?v=1.1">

 <script>
   (function() {
     var cx = '000162378814775985090:molvbm0vggm';
     var gcse = document.createElement('script');
     gcse.type = 'text/javascript';
     gcse.async = true;
     gcse.src = (document.location.protocol == 'https:' ? 'https:' : 'http:') +
         '//cse.google.com/cse.js?cx=' + cx;
     var s = document.getElementsByTagName('script')[0];
     s.parentNode.insertBefore(gcse, s);
   })();
 </script>


   </head>

   <body>
     <!-- Start page_header include -->
 <script src="//ajax.googleapis.com/ajax/libs/jquery/2.2.4/jquery.min.js"></script>

 <div class="top-navigator">
   <div class="container">
     <div class="left-cont">
       <a class="logo" href="/"><span class="druid-logo"></span></a>
     </div>
     <div class="right-cont">
       <ul class="links">
         <li class=""><a href="/technology">Technology</a></li>
         <li class=""><a href="/use-cases">Use Cases</a></li>
         <li class=""><a href="/druid-powered">Powered By</a></li>
         <li class=""><a href="/docs/latest/design/">Docs</a></li>
         <li class=""><a href="/community/">Community</a></li>
         <li class="header-dropdown">
           <a>Apache</a>
           <div class="header-dropdown-menu">
             <a href="https://www.apache.org/" target="_blank">Foundation</a>
             <a href="https://www.apache.org/events/current-event" target="_blank">Events</a>
             <a href="https://www.apache.org/licenses/" target="_blank">License</a>
             <a href="https://www.apache.org/foundation/thanks.html" target="_blank">Thanks</a>
             <a href="https://www.apache.org/security/" target="_blank">Security</a>
             <a href="https://www.apache.org/foundation/sponsorship.html" target="_blank">Sponsorship</a>
           </div>
         </li>
         <li class=" button-link"><a href="/downloads.html">Download</a></li>
       </ul>
     </div>
   </div>
   <div class="action-button menu-icon">
     <span class="fa fa-bars"></span> MENU
   </div>
   <div class="action-button menu-icon-close">
     <span class="fa fa-times"></span> MENU
   </div>
 </div>

 <script type="text/javascript">
   var $menu = $('.right-cont');
   var $menuIcon = $('.menu-icon');
   var $menuIconClose = $('.menu-icon-close');

   function showMenu() {
     $menu.fadeIn(100);
     $menuIcon.fadeOut(100);
     $menuIconClose.fadeIn(100);
   }

   $menuIcon.click(showMenu);

   function hideMenu() {
     $menu.fadeOut(100);
     $menuIconClose.fadeOut(100);
     $menuIcon.fadeIn(100);
   }

   $menuIconClose.click(hideMenu);

   $(window).resize(function() {
     if ($(window).width() >= 840) {
       $menu.fadeIn(100);
       $menuIcon.fadeOut(100);
       $menuIconClose.fadeOut(100);
     }
     else {
       $menu.fadeOut(100);
       $menuIcon.fadeIn(100);
       $menuIconClose.fadeOut(100);
     }
   });
 </script>

 <!-- Stop page_header include -->


     <div class="container doc-container">


       <p> Looking for the <a href="/docs/0.23.0/">latest stable documentation</a>?</p>


       <div class="row">
         <div class="col-md-9 doc-content">
           <p>
             <a class="btn btn-default btn-xs visible-xs-inline-block visible-sm-inline-block" href="#toc">Table of Contents</a>
           </p>
           <!--
   ~ 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 id="task-locking-priority">Task Locking &amp; Priority</h1>

 <h2 id="locking">Locking</h2>

 <p>Once an Overlord process accepts a task, the task acquires locks for the data source and intervals specified in the task.</p>

 <p>There are two lock types, i.e., <em>shared lock</em> and <em>exclusive lock</em>.</p>

 <ul>
 <li>A task needs to acquire a shared lock before it reads segments of an interval. Multiple shared locks can be acquired for the same dataSource and interval. Shared locks are always preemptable, but they don&#39;t preempt each other.</li>
 <li>A task needs to acquire an exclusive lock before it writes segments for an interval. An exclusive lock is also preemptable except while the task is publishing segments.</li>
 </ul>

 <p>Each task can have different lock priorities. The locks of higher-priority tasks can preempt the locks of lower-priority tasks. The lock preemption works based on <em>optimistic locking</em>. When a lock is preempted, it is not notified to the owner task immediately. Instead, it&#39;s notified when the owner task tries to acquire the same lock again. (Note that lock acquisition is idempotent unless the lock is preempted.) In general, tasks don&#39;t compete for acquiring locks because they usually targets different dataSources or intervals.</p>

 <p>A task writing data into a dataSource must acquire exclusive locks for target intervals. Note that exclusive locks are still preemptable. That is, they also be able to be preempted by higher priority locks unless they are <em>publishing segments</em> in a critical section. Once publishing segments is finished, those locks become preemptable again.</p>

 <p>Tasks do not need to explicitly release locks, they are released upon task completion. Tasks may potentially release
 locks early if they desire. Task ids are unique by naming them using UUIDs or the timestamp in which the task was created.
 Tasks are also part of a &quot;task group&quot;, which is a set of tasks that can share interval locks.</p>

 <h2 id="priority">Priority</h2>

 <p>Apache Druid (incubating)&#39;s indexing tasks use locks for atomic data ingestion. Each lock is acquired for the combination of a dataSource and an interval. Once a task acquires a lock, it can write data for the dataSource and the interval of the acquired lock unless the lock is released or preempted. Please see <a href="#locking">the below Locking section</a></p>

 <p>Each task has a priority which is used for lock acquisition. The locks of higher-priority tasks can preempt the locks of lower-priority tasks if they try to acquire for the same dataSource and interval. If some locks of a task are preempted, the behavior of the preempted task depends on the task implementation. Usually, most tasks finish as failed if they are preempted.</p>

 <p>Tasks can have different default priorities depening on their types. Here are a list of default priorities. 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 like below.</p>
 <div class="highlight"><pre><code class="language-json" data-lang="json"><span></span><span class="nt">&quot;context&quot;</span> <span class="p">:</span> <span class="p">{</span>
   <span class="nt">&quot;priority&quot;</span> <span class="p">:</span> <span class="mi">100</span>
 <span class="p">}</span>
 </code></pre></div>
 <h2 id="task-context">Task Context</h2>

 <p>The task context is used for various task configuration parameters. 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>priority</td>
 <td>Different based on task types. See <a href="#priority">Priority</a>.</td>
 <td>Task priority</td>
 </tr>
 </tbody></table>

 <div class="note caution">
 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 `taskLockTimeout` is greater than `druid.server.http.maxIdleTime` of Overlords.
 </div>

         </div>
         <div class="col-md-3">
           <div class="searchbox">
             <gcse:searchbox-only></gcse:searchbox-only>
           </div>
           <div id="toc" class="nav toc hidden-print">
           </div>
         </div>
       </div>
     </div>

     <!-- Start page_footer include -->
 <footer class="druid-footer">
 <div class="container">
   <div class="text-center">
     <p>
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
     <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <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>&ensp;·&ensp;
     <a title="Follow Druid" href="https://twitter.com/druidio" target="_blank"><span class="fab fa-twitter"></span></a>&ensp;·&ensp;
     <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 © 2020 <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>

 <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>
 <script>
   function trackDownload(type, url) {
     ga('send', 'event', 'download', type, url);
   }
 </script>
 <script src="//code.jquery.com/jquery.min.js"></script>
 <script src="//maxcdn.bootstrapcdn.com/bootstrap/3.2.0/js/bootstrap.min.js"></script>
 <script src="/assets/js/druid.js"></script>
 <!-- stop page_footer include -->


     <script>
     $(function() {
       $(".toc").load("/docs/0.14.1-incubating/toc.html");

       // There is no way to tell when .gsc-input will be async loaded into the page so just try to set a placeholder until it works
       var tries = 0;
       var timer = setInterval(function() {
         tries++;
         if (tries > 300) clearInterval(timer);
         var searchInput = $('input.gsc-input');
         if (searchInput.length) {
           searchInput.attr('placeholder', 'Search');
           clearInterval(timer);
         }
       }, 100);
     });
     </script>
   </body>
 </html>
	<!DOCTYPE html>
	<html lang="en">
	<head>
	<meta charset="UTF-8" />
	<meta name="viewport" content="width=device-width, initial-scale=1.0">
	<meta name="description" content="Apache Druid">
	<meta name="keywords" content="druid,kafka,database,analytics,streaming,real-time,real time,apache,open source">
	<meta name="author" content="Apache Software Foundation">

	<title>Druid \| Task Locking & Priority</title>

	<link rel="alternate" type="application/atom+xml" href="/feed">
	<link rel="shortcut icon" href="/img/favicon.png">

	<link rel="stylesheet" href="https://use.fontawesome.com/releases/v5.7.2/css/all.css" integrity="sha384-fnmOCqbTlWIlj8LyTjo7mOUStjsKC4pOpQbqyi7RrhN7udi9RwhKkMHpvLbHG9Sr" crossorigin="anonymous">

	<link href='//fonts.googleapis.com/css?family=Open+Sans+Condensed:300,700,300italic\|Open+Sans:300italic,400italic,600italic,400,300,600,700' rel='stylesheet' type='text/css'>

	<link rel="stylesheet" href="/css/bootstrap-pure.css?v=1.1">
	<link rel="stylesheet" href="/css/base.css?v=1.1">
	<link rel="stylesheet" href="/css/header.css?v=1.1">
	<link rel="stylesheet" href="/css/footer.css?v=1.1">
	<link rel="stylesheet" href="/css/syntax.css?v=1.1">
	<link rel="stylesheet" href="/css/docs.css?v=1.1">

	<script>
	(function() {
	var cx = '000162378814775985090:molvbm0vggm';
	var gcse = document.createElement('script');
	gcse.type = 'text/javascript';
	gcse.async = true;
	gcse.src = (document.location.protocol == 'https:' ? 'https:' : 'http:') +
	'//cse.google.com/cse.js?cx=' + cx;
	var s = document.getElementsByTagName('script')[0];
	s.parentNode.insertBefore(gcse, s);
	})();
	</script>


	</head>

	<body>
	<!-- Start page_header include -->
	<script src="//ajax.googleapis.com/ajax/libs/jquery/2.2.4/jquery.min.js"></script>

	<div class="top-navigator">
	<div class="container">
	<div class="left-cont">
	<a class="logo" href="/"><span class="druid-logo"></span></a>
	</div>
	<div class="right-cont">
	<ul class="links">
	<li class=""><a href="/technology">Technology</a></li>
	<li class=""><a href="/use-cases">Use Cases</a></li>
	<li class=""><a href="/druid-powered">Powered By</a></li>
	<li class=""><a href="/docs/latest/design/">Docs</a></li>
	<li class=""><a href="/community/">Community</a></li>
	<li class="header-dropdown">
	<a>Apache</a>
	<div class="header-dropdown-menu">
	<a href="https://www.apache.org/" target="_blank">Foundation</a>
	<a href="https://www.apache.org/events/current-event" target="_blank">Events</a>
	<a href="https://www.apache.org/licenses/" target="_blank">License</a>
	<a href="https://www.apache.org/foundation/thanks.html" target="_blank">Thanks</a>
	<a href="https://www.apache.org/security/" target="_blank">Security</a>
	<a href="https://www.apache.org/foundation/sponsorship.html" target="_blank">Sponsorship</a>
	</div>
	</li>
	<li class=" button-link"><a href="/downloads.html">Download</a></li>
	</ul>
	</div>
	</div>
	<div class="action-button menu-icon">
	<span class="fa fa-bars"></span> MENU
	</div>
	<div class="action-button menu-icon-close">
	<span class="fa fa-times"></span> MENU
	</div>
	</div>

	<script type="text/javascript">
	var $menu = $('.right-cont');
	var $menuIcon = $('.menu-icon');
	var $menuIconClose = $('.menu-icon-close');

	function showMenu() {
	$menu.fadeIn(100);
	$menuIcon.fadeOut(100);
	$menuIconClose.fadeIn(100);
	}

	$menuIcon.click(showMenu);

	function hideMenu() {
	$menu.fadeOut(100);
	$menuIconClose.fadeOut(100);
	$menuIcon.fadeIn(100);
	}

	$menuIconClose.click(hideMenu);

	$(window).resize(function() {
	if ($(window).width() >= 840) {
	$menu.fadeIn(100);
	$menuIcon.fadeOut(100);
	$menuIconClose.fadeOut(100);
	}
	else {
	$menu.fadeOut(100);
	$menuIcon.fadeIn(100);
	$menuIconClose.fadeOut(100);
	}
	});
	</script>

	<!-- Stop page_header include -->


	<div class="container doc-container">




	<p> Looking for the <a href="/docs/0.23.0/">latest stable documentation</a>?</p>


	<div class="row">
	<div class="col-md-9 doc-content">
	<p>
	<a class="btn btn-default btn-xs visible-xs-inline-block visible-sm-inline-block" href="#toc">Table of Contents</a>
	</p>
	<!--
	~ 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 id="task-locking-priority">Task Locking & Priority</h1>

	<h2 id="locking">Locking</h2>

	<p>Once an Overlord process accepts a task, the task acquires locks for the data source and intervals specified in the task.</p>

	<p>There are two lock types, i.e., <em>shared lock</em> and <em>exclusive lock</em>.</p>

	<ul>
	<li>A task needs to acquire a shared lock before it reads segments of an interval. Multiple shared locks can be acquired for the same dataSource and interval. Shared locks are always preemptable, but they don't preempt each other.</li>
	<li>A task needs to acquire an exclusive lock before it writes segments for an interval. An exclusive lock is also preemptable except while the task is publishing segments.</li>
	</ul>

	<p>Each task can have different lock priorities. The locks of higher-priority tasks can preempt the locks of lower-priority tasks. The lock preemption works based on <em>optimistic locking</em>. When a lock is preempted, it is not notified to the owner task immediately. Instead, it's notified when the owner task tries to acquire the same lock again. (Note that lock acquisition is idempotent unless the lock is preempted.) In general, tasks don't compete for acquiring locks because they usually targets different dataSources or intervals.</p>

	<p>A task writing data into a dataSource must acquire exclusive locks for target intervals. Note that exclusive locks are still preemptable. That is, they also be able to be preempted by higher priority locks unless they are <em>publishing segments</em> in a critical section. Once publishing segments is finished, those locks become preemptable again.</p>

	<p>Tasks do not need to explicitly release locks, they are released upon task completion. Tasks may potentially release
	locks early if they desire. Task ids are unique by naming them using UUIDs or the timestamp in which the task was created.
	Tasks are also part of a "task group", which is a set of tasks that can share interval locks.</p>

	<h2 id="priority">Priority</h2>

	<p>Apache Druid (incubating)'s indexing tasks use locks for atomic data ingestion. Each lock is acquired for the combination of a dataSource and an interval. Once a task acquires a lock, it can write data for the dataSource and the interval of the acquired lock unless the lock is released or preempted. Please see <a href="#locking">the below Locking section</a></p>

	<p>Each task has a priority which is used for lock acquisition. The locks of higher-priority tasks can preempt the locks of lower-priority tasks if they try to acquire for the same dataSource and interval. If some locks of a task are preempted, the behavior of the preempted task depends on the task implementation. Usually, most tasks finish as failed if they are preempted.</p>

	<p>Tasks can have different default priorities depening on their types. Here are a list of default priorities. 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 like below.</p>
	<div class="highlight"><pre><code class="language-json" data-lang="json"><span></span><span class="nt">"context"</span> <span class="p">:</span> <span class="p">{</span>
	<span class="nt">"priority"</span> <span class="p">:</span> <span class="mi">100</span>
	<span class="p">}</span>
	</code></pre></div>
	<h2 id="task-context">Task Context</h2>

	<p>The task context is used for various task configuration parameters. 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>priority</td>
	<td>Different based on task types. See <a href="#priority">Priority</a>.</td>
	<td>Task priority</td>
	</tr>
	</tbody></table>

	<div class="note caution">
	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 `taskLockTimeout` is greater than `druid.server.http.maxIdleTime` of Overlords.
	</div>

	</div>
	<div class="col-md-3">
	<div class="searchbox">
	<gcse:searchbox-only></gcse:searchbox-only>
	</div>
	<div id="toc" class="nav toc hidden-print">
	</div>
	</div>
	</div>
	</div>

	<!-- Start page_footer include -->
	<footer class="druid-footer">
	<div class="container">
	<div class="text-center">
	<p>
	<a href="/technology">Technology</a>&ensp;·&ensp;
	<a href="/use-cases">Use Cases</a>&ensp;·&ensp;
	<a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
	<a href="/docs/latest/">Docs</a>&ensp;·&ensp;
	<a href="/community/">Community</a>&ensp;·&ensp;
	<a href="/downloads.html">Download</a>&ensp;·&ensp;
	<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>&ensp;·&ensp;
	<a title="Follow Druid" href="https://twitter.com/druidio" target="_blank"><span class="fab fa-twitter"></span></a>&ensp;·&ensp;
	<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 © 2020 <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>

	<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>
	<script>
	function trackDownload(type, url) {
	ga('send', 'event', 'download', type, url);
	}
	</script>
	<script src="//code.jquery.com/jquery.min.js"></script>
	<script src="//maxcdn.bootstrapcdn.com/bootstrap/3.2.0/js/bootstrap.min.js"></script>
	<script src="/assets/js/druid.js"></script>
	<!-- stop page_footer include -->


	<script>
	$(function() {
	$(".toc").load("/docs/0.14.1-incubating/toc.html");

	// There is no way to tell when .gsc-input will be async loaded into the page so just try to set a placeholder until it works
	var tries = 0;
	var timer = setInterval(function() {
	tries++;
	if (tries > 300) clearInterval(timer);
	var searchInput = $('input.gsc-input');
	if (searchInput.length) {
	searchInput.attr('placeholder', 'Search');
	clearInterval(timer);
	}
	}, 100);
	});
	</script>
	</body>
	</html>