Modified: helix/site-content/1.0.2-docs/tutorial_user_content_store.html URL: http://svn.apache.org/viewvc/helix/site-content/1.0.2-docs/tutorial_user_content_store.html?rev=1909461&r1=1909460&r2=1909461&view=diff ============================================================================== --- helix/site-content/1.0.2-docs/tutorial_user_content_store.html (original) +++ helix/site-content/1.0.2-docs/tutorial_user_content_store.html Thu Apr 27 23:08:36 2023 @@ -1,8 +1,13 @@ <!DOCTYPE html> + + + + + + <!-- - Generated by Apache Maven Doxia at 2022-04-15 - Rendered using Maven Reflow Skin 1.0.0 (http://andriusvelykis.github.com/reflow-maven-skin) + Generated by Apache Maven Doxia at 2022-10-19 Rendered using Reflow Maven Skin 2.0.0 (https://olamy.github.io/reflow-maven-skin) --> <html xml:lang="en" lang="en"> @@ -13,61 +18,84 @@ <meta name="description" content="" /> <meta http-equiv="content-language" content="en" /> - <link href="http://netdna.bootstrapcdn.com/twitter-bootstrap/2.2.2/css/bootstrap.min.css"; rel="stylesheet" /> - <link href="http://netdna.bootstrapcdn.com/twitter-bootstrap/2.2.2/css/bootstrap-responsive.min.css"; rel="stylesheet" /> + <link href="./css/bootstrap.min.css" rel="stylesheet" /> + <link href="./css/bootstrap-responsive.min.css" rel="stylesheet" /> <link href="./css/docs.css" rel="stylesheet" /> <link href="./css/reflow-skin.css" rel="stylesheet" /> - - + + <link href="./css/lightbox.css" rel="stylesheet" /> - + <link href="./css/site.css" rel="stylesheet" /> <link href="./css/print.css" rel="stylesheet" media="print" /> - + <!-- Le HTML5 shim, for IE6-8 support of HTML5 elements --> <!--[if lt IE 9]> - <script src="http://html5shim.googlecode.com/svn/trunk/html5.js";></script> + <script src="./js/html5.js"></script> <![endif]--> - - </head> - <body class="page-$config.fileId project-$config.projectId" data-spy="scroll" data-offset="60" data-target="#toc-scroll-target"> + + + + +<!-- Matomo --> +<script> + var _paq = window._paq = window._paq || []; + _paq.push(['disableCookies']); 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id="bannerRight"><img src="" alt='"''"' /></a> + <a href="https://www.apache.org/"; id="bannerRight"><img src="../images/feather_small.gif" alt='"''"' /></a> </div> </div> </div> + </div> <div> <ul class="breadcrumb"> - <li><a href="" title="Apache Helix">Apache Helix </a></li> + <li><a href="http://helix.apache.org/"; title="Apache Helix" class="externalLink">Apache Helix</a></li> <li class="divider">/</li> - <li><a href="" title="Release 1.0.2">Release 1.0.2 </a></li> + <li><a href="../" title="Apache Helix">Apache Helix</a></li> + <li class="divider">/</li> + <li><a href="./" title="Release 1.0.2">Release 1.0.2</a></li> <li class="divider">/</li> <li>Tutorial - User Defined Content Store for Tasks</li> - <li class="publishDate version-date pull-right">Last Published: 2022-04-15</li> + <li class="publishDate version-date pull-right">Last Published: 2022-10-19</li> </ul> </div> </header> @@ -107,94 +141,163 @@ <div class="row"> <div class="span12"> <div class="body-content"> -$bodyWithHeader +<!-- +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. +--> +<section> + <div class="page-header"> + <h2 id="Helix_Tutorial:_User_Defined_Content_Store_for_Tasks"><a href="./Tutorial.html">Helix Tutorial</a>: User Defined Content Store for Tasks</h2> + </div> + <p>The purpose of user defined content store is to provide an easy use feature for some task dedicated meta temporary store. In this chapter, we'll learn how to implement and use content store in the user defined tasks.</p> + <section> + <h3 id="Content_Store_Implementation">Content Store Implementation</h3> + <p>Extends abstract class UserContentStore.</p> + <div class="source"> + <pre><code>private static class ContentStoreTask extends UserContentStore implements Task { + @Override public TaskResult run() { + ... + } + @Override public void cancel() { + ... + } +} +</code></pre> + </div> + <p>The default methods support 3 types of scopes:</p> + <ol style="list-style-type: decimal"> + <li>WORKFLOW: Define the content store in workflow level</li> + <li>JOB: Define the content store in job level</li> + <li>TASK: Define the content store in task level</li> + </ol> + </section> + <section> + <h3 id="Content_Store_Usage">Content Store Usage</h3> + <p>Access content store in Task.run() method.</p> + <div class="source"> + <pre><code> private static class ContentStoreTask extends UserContentStore implements Task { + @Override public TaskResult run() { + // put values into the store + putUserContent("ContentTest", "Value1", Scope.JOB); + putUserContent("ContentTest", "Value2", Scope.WORKFLOW); + putUserContent("ContentTest", "Value3", Scope.TASK); + + // get the values with the same key in the different scopes + if (!getUserContent("ContentTest", Scope.JOB).equals("Value1") || + !getUserContent("ContentTest", Scope.WORKFLOW).equals("Value2") || + !getUserContent("ContentTest", Scope.TASK).equals("Value3")) { + return new TaskResult(TaskResult.Status.FAILED, null); + } + + return new TaskResult(TaskResult.Status.COMPLETED, null); + } + } +</code></pre> + </div> + </section> +</section> </div> </div> </div> </div> </div><!-- /container --> - + <!-- Footer ================================================== --> <footer class="well"> <div class="container"> <div class="row"> - <div class="span9 bottom-nav"> + <div class="span3 bottom-nav"> <ul class="nav nav-list"> <li class="nav-header">Get Helix</li> - <li class="active"> - <a href="#" title="Download">Download </a> + <li > + <a href="download.html" title="Download">Download</a> </li> - <li class="active"> - <a href="#" title="Building">Building </a> + <li > + <a href="Building.html" title="Building">Building</a> </li> - <li class="active"> - <a href="#" title="Release Notes">Release Notes </a> + <li > + <a href="releasenotes/release-1.0.2.html" title="Release Notes">Release Notes</a> </li> + </ul> + </div> + <div class="span3 bottom-nav"> + <ul class="nav nav-list"> <li class="nav-header">Hands-On</li> - <li class="active"> - <a href="#" title="Quick Start">Quick Start </a> + <li > + <a href="Quickstart.html" title="Quick Start">Quick Start</a> </li> - <li class="active"> - <a href="#" title="Tutorial">Tutorial </a> + <li > + <a href="Tutorial.html" title="Tutorial">Tutorial</a> </li> - <li class="active"> - <a href="#" title="Javadocs">Javadocs </a> + <li > + <a href="../javadocs/1.0.2" title="Javadocs">Javadocs</a> </li> + </ul> + </div> + <div class="span3 bottom-nav"> + <ul class="nav nav-list"> <li class="nav-header">Recipes</li> - <li class="active"> - <a href="#" title="Distributed lock manager">Distributed lock manager </a> + <li > + <a href="recipes/lock_manager.html" title="Distributed lock manager">Distributed lock manager</a> </li> - <li class="active"> - <a href="#" title="Rabbit MQ consumer group">Rabbit MQ consumer group </a> + <li > + <a href="recipes/rabbitmq_consumer_group.html" title="Rabbit MQ consumer group">Rabbit MQ consumer group</a> </li> - <li class="active"> - <a href="#" title="Rsync replicated file store">Rsync replicated file store </a> + <li > + <a href="recipes/rsync_replicated_file_store.html" title="Rsync replicated file store">Rsync replicated file store</a> </li> - <li class="active"> - <a href="#" title="Service discovery">Service discovery </a> + <li > + <a href="recipes/service_discovery.html" title="Service discovery">Service discovery</a> </li> - <li class="active"> - <a href="#" title="Distributed task DAG execution">Distributed task DAG execution </a> + <li > + <a href="recipes/task_dag_execution.html" title="Distributed task DAG execution">Distributed task DAG execution</a> </li> </ul> </div> </div> </div> </footer> - + <div class="container subfooter"> <div class="row"> <div class="span12"> <p class="pull-right"><a href="#">Back to top</a></p> <p class="copyright">Copyright ©2022 <a href="https://www.apache.org/";>The Apache Software Foundation</a>. 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Modified: helix/site-content/1.0.2-docs/tutorial_user_def_rebalancer.html URL: http://svn.apache.org/viewvc/helix/site-content/1.0.2-docs/tutorial_user_def_rebalancer.html?rev=1909461&r1=1909460&r2=1909461&view=diff ============================================================================== --- helix/site-content/1.0.2-docs/tutorial_user_def_rebalancer.html (original) +++ helix/site-content/1.0.2-docs/tutorial_user_def_rebalancer.html Thu Apr 27 23:08:36 2023 @@ -1,8 +1,13 @@ <!DOCTYPE html> + + + + + + <!-- - Generated by Apache Maven Doxia at 2022-04-15 - Rendered using Maven Reflow Skin 1.0.0 (http://andriusvelykis.github.com/reflow-maven-skin) + Generated by Apache Maven Doxia at 2022-10-19 Rendered using Reflow Maven Skin 2.0.0 (https://olamy.github.io/reflow-maven-skin) --> <html xml:lang="en" lang="en"> @@ -13,61 +18,84 @@ <meta name="description" content="" /> <meta http-equiv="content-language" content="en" /> - <link href="http://netdna.bootstrapcdn.com/twitter-bootstrap/2.2.2/css/bootstrap.min.css"; 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+ _paq.push(['trackPageView']); + _paq.push(['enableLinkTracking']); + + (function() { + var u="https://analytics.apache.org";; + _paq.push(['setTrackerUrl', u+'/matomo.php']); + _paq.push(['setSiteId', '15']); + var d=document, g=d.createElement('script'), s=d.getElementsByTagName('script')[0]; + g.async=true; g.src=u+'/matomo.js'; s.parentNode.insertBefore(g,s); + })(); +</script> +<!-- End Matomo Code --> + </head> + + <body class="page-tutorial_user_def_rebalancer project-102-docs" data-spy="scroll" data-offset="60" data-target="#toc-scroll-target"> + + <div class="navbar navbar-fixed-top"> <div class="navbar-inner"> <div class="container"> - <a class="btn btn-navbar" data-toggle="collapse" data-target=".nav-collapse"> + <a class="btn btn-navbar" data-toggle="collapse" data-target="#top-nav-collapse"> <span class="icon-bar"></span> <span class="icon-bar"></span> <span class="icon-bar"></span> </a> - <div class="nav-collapse"> + <a class="brand" href="..">Apache Helix</a> + <div class="nav-collapse collapse" id="top-nav-collapse"> <ul class="nav pull-right"> - <li class="active"><a href="" title="Helix 1.0.2">Helix 1.0.2 </a></li> - <li class="dropdown active"> + <li ><a href="index.html" title="Helix 1.0.2">Helix 1.0.2</a></li> + <li class="dropdown"> <a href="#" class="dropdown-toggle" data-toggle="dropdown">Get Helix <b class="caret"></b></a> <ul class="dropdown-menu"> - <li class="active"><a href="" title="Download">Download </a></li> - <li class="active"><a href="" title="Building">Building </a></li> - <li class="active"><a href="" title="Release Notes">Release Notes </a></li> + <li ><a href="download.html" title="Download">Download</a></li> + <li ><a href="Building.html" title="Building">Building</a></li> + <li ><a href="releasenotes/release-1.0.2.html" title="Release Notes">Release Notes</a></li> </ul> </li> - <li class="dropdown active"> + <li class="dropdown"> <a href="#" class="dropdown-toggle" data-toggle="dropdown">Hands-On <b class="caret"></b></a> <ul class="dropdown-menu"> - <li class="active"><a href="" title="Quick Start">Quick Start </a></li> - <li class="active"><a href="" title="Tutorial">Tutorial </a></li> - <li class="active"><a href="" title="Javadocs">Javadocs </a></li> + <li ><a href="Quickstart.html" title="Quick Start">Quick Start</a></li> + <li ><a href="Tutorial.html" title="Tutorial">Tutorial</a></li> + <li ><a href="../javadocs/1.0.2" title="Javadocs">Javadocs</a></li> </ul> </li> - <li class="dropdown active"> + <li class="dropdown"> <a href="#" class="dropdown-toggle" data-toggle="dropdown">Recipes <b class="caret"></b></a> <ul class="dropdown-menu"> - <li class="active"><a href="" title="Distributed lock manager">Distributed lock manager </a></li> - <li class="active"><a href="" title="Rabbit MQ consumer group">Rabbit MQ consumer group </a></li> - <li class="active"><a href="" title="Rsync replicated file store">Rsync replicated file store </a></li> - <li class="active"><a href="" title="Service discovery">Service discovery </a></li> - <li class="active"><a href="" title="Distributed task DAG execution">Distributed task DAG execution </a></li> + <li ><a href="recipes/lock_manager.html" title="Distributed lock manager">Distributed lock manager</a></li> + <li ><a href="recipes/rabbitmq_consumer_group.html" title="Rabbit MQ consumer group">Rabbit MQ consumer group</a></li> + <li ><a href="recipes/rsync_replicated_file_store.html" title="Rsync replicated file store">Rsync replicated file store</a></li> + <li ><a href="recipes/service_discovery.html" title="Service discovery">Service discovery</a></li> + <li ><a href="recipes/task_dag_execution.html" title="Distributed task DAG execution">Distributed task DAG execution</a></li> </ul> </li> </ul> @@ -75,30 +103,36 @@ </div> </div> </div> - + <div class="container"> - + <!-- Masthead ================================================== --> - <header class="jumbotron subhead"> + + <header> + <div class="jumbotron subhead"> <div class="row" id="banner"> <div class="span12"> <div class="pull-left"> - <a href="" id="bannerLeft"><img src="" alt='"''"' /></a> + <a href="../" id="bannerLeft"><img src="../images/helix-logo.jpg" alt='"''"' /></a> + <p class="lead">A cluster management framework for partitioned and replicated distributed resources</p> </div> <div class="pull-right"> - <a href="http://www.apache.org/"; id="bannerRight"><img src="" alt='"''"' /></a> + <a href="https://www.apache.org/"; id="bannerRight"><img src="../images/feather_small.gif" alt='"''"' /></a> </div> </div> </div> + </div> <div> <ul class="breadcrumb"> - <li><a href="" title="Apache Helix">Apache Helix </a></li> + <li><a href="http://helix.apache.org/"; title="Apache Helix" class="externalLink">Apache Helix</a></li> + <li class="divider">/</li> + <li><a href="../" title="Apache Helix">Apache Helix</a></li> <li class="divider">/</li> - <li><a href="" title="Release 1.0.2">Release 1.0.2 </a></li> + <li><a href="./" title="Release 1.0.2">Release 1.0.2</a></li> <li class="divider">/</li> <li>Tutorial - User-Defined Rebalancing</li> - <li class="publishDate version-date pull-right">Last Published: 2022-04-15</li> + <li class="publishDate version-date pull-right">Last Published: 2022-10-19</li> </ul> </div> </header> @@ -107,94 +141,262 @@ <div class="row"> <div class="span12"> <div class="body-content"> -$bodyWithHeader +<!-- +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. +--> +<section> + <div class="page-header"> + <h2 id="Helix_Tutorial:_User-Defined_Rebalancing"><a href="./Tutorial.html">Helix Tutorial</a>: User-Defined Rebalancing</h2> + </div> + <p>Even though Helix can compute both the location and the state of replicas internally using a default fully-automatic rebalancer, specific applications may require rebalancing strategies that optimize for different requirements. Thus, Helix allows applications to plug in arbitrary rebalancer algorithms that implement a provided interface. One of the main design goals of Helix is to provide maximum flexibility to any distributed application. Thus, it allows applications to fully implement the rebalancer, which is the core constraint solver in the system, if the application developer so chooses.</p> + <p>Whenever the state of the cluster changes, as is the case when participants join or leave the cluster, Helix automatically calls the rebalancer to compute a new mapping of all the replicas in the resource. When using a pluggable rebalancer, the only required step is to register it with Helix. Subsequently, no additional bootstrapping steps are necessary. Helix uses reflection to look up and load the class dynamically at runtime. As a result, it is also technically possible to change the rebalancing strategy used at any time.</p> + <p>The Rebalancer interface is as follows:</p> + <div class="source"> + <pre><code>void init(HelixManager manager); + +IdealState computeNewIdealState(String resourceName, IdealState currentIdealState, + final CurrentStateOutput currentStateOutput, final ClusterDataCache clusterData); +</code></pre> + </div> + <p>The first parameter is the resource to rebalance, the second is pre-existing ideal mappings, the third is a snapshot of the actual placements and state assignments, and the fourth is a full cache of all of the cluster data available to Helix. Internally, Helix implements the same interface for its own rebalancing routines, so a user-defined rebalancer will be cognizant of the same information about the cluster as an internal implementation. Helix strives to provide applications the ability to implement algorithms that may require a large portion of the entire state of the cluster to make the best placement and state assignment decisions possible.</p> + <p>An IdealState is a full representation of the location of each replica of each partition of a given resource. This is a simple representation of the placement that the algorithm believes is the best possible. If the placement meets all defined constraints, this is what will become the actual state of the distributed system.</p> + <section> + <h3 id="Specifying_a_Rebalancer">Specifying a Rebalancer</h3> + <p>For implementations that set up the cluster through existing code, the following HelixAdmin calls will update the Rebalancer class:</p> + <div class="source"> + <pre><code>IdealState idealState = helixAdmin.getResourceIdealState(clusterName, resourceName); +idealState.setRebalanceMode(RebalanceMode.USER_DEFINED); +idealState.setRebalancerClassName(className); +helixAdmin.setResourceIdealState(clusterName, resourceName, idealState); +</code></pre> + </div> + <p>There are two key fields to set to specify that a pluggable rebalancer should be used. First, the rebalance mode should be set to USER_DEFINED, and second the rebalancer class name should be set to a class that implements Rebalancer and is within the scope of the project. The class name is a fully-qualified class name consisting of its package and its name. Without specification of the USER_DEFINED mode, the user-defined rebalancer class will not be used even if specified. Furthermore, Helix will not attempt to rebalance the resources through its standard routines if its mode is USER_DEFINED, regardless of whether or not a rebalancer class is registered.</p> + </section> + <section> + <h3 id="Example">Example</h3> + <p>In the next release (0.7.0), we will provide a full recipe of a user-defined rebalancer in action.</p> + <p>Consider the case where partitions are locks in a lock manager and 6 locks are to be distributed evenly to a set of participants, and only one participant can hold each lock. We can define a rebalancing algorithm that simply takes the modulus of the lock number and the number of participants to evenly distribute the locks across participants. Helix allows capping the number of partitions a participant can accept, but since locks are lightweight, we do not need to define a restriction in this case. The following is a succinct implementation of this algorithm.</p> + <div class="source"> + <pre><code>@Override +IdealState computeNewIdealState(String resourceName, IdealState currentIdealState, + final CurrentStateOutput currentStateOutput, final ClusterDataCache clusterData) { + // Get the list of live participants in the cluster + List<String> liveParticipants = new ArrayList<String>(clusterData.getLiveInstances().keySet()); + + // Count the number of participants allowed to lock each lock (in this example, this is 1) + int lockHolders = Integer.parseInt(currentIdealState.getReplicas()); + + // Fairly assign the lock state to the participants using a simple mod-based sequential + // assignment. For instance, if each lock can be held by 3 participants, lock 0 would be held + // by participants (0, 1, 2), lock 1 would be held by (1, 2, 3), and so on, wrapping around the + // number of participants as necessary. + int i = 0; + for (String partition : currentIdealState.getPartitionSet()) { + List<String> preferenceList = new ArrayList<String>(); + for (int j = i; j < i + lockHolders; j++) { + int participantIndex = j % liveParticipants.size(); + String participant = liveParticipants.get(participantIndex); + // enforce that a participant can only have one instance of a given lock + if (!preferenceList.contains(participant)) { + preferenceList.add(participant); + } + } + currentIdealState.setPreferenceList(partition, preferenceList); + i++; + } + return assignment; +} +</code></pre> + </div> + <p>Here are the IdealState preference lists emitted by the user-defined rebalancer for a 3-participant system whenever there is a change to the set of participants.</p> + <ul> + <li>Participant_A joins</li> + </ul> + <div class="source"> + <pre><code>{ + "lock_0": ["Participant_A"], + "lock_1": ["Participant_A"], + "lock_2": ["Participant_A"], + "lock_3": ["Participant_A"], + "lock_4": ["Participant_A"], + "lock_5": ["Participant_A"], +} +</code></pre> + </div> + <p>A preference list is a mapping for each resource of partition to the participants serving each replica. The state model is a simple LOCKED/RELEASED model, so participant A holds all lock partitions in the LOCKED state.</p> + <ul> + <li>Participant_B joins</li> + </ul> + <div class="source"> + <pre><code>{ + "lock_0": ["Participant_A"], + "lock_1": ["Participant_B"], + "lock_2": ["Participant_A"], + "lock_3": ["Participant_B"], + "lock_4": ["Participant_A"], + "lock_5": ["Participant_B"], +} +</code></pre> + </div> + <p>Now that there are two participants, the simple mod-based function assigns every other lock to the second participant. On any system change, the rebalancer is invoked so that the application can define how to redistribute its resources.</p> + <ul> + <li>Participant_C joins (steady state)</li> + </ul> + <div class="source"> + <pre><code>{ + "lock_0": ["Participant_A"], + "lock_1": ["Participant_B"], + "lock_2": ["Participant_C"], + "lock_3": ["Participant_A"], + "lock_4": ["Participant_B"], + "lock_5": ["Participant_C"], +} +</code></pre> + </div> + <p>This is the steady state of the system. Notice that four of the six locks now have a different owner. That is because of the naïve modulus-based assignmemt approach used by the user-defined rebalancer. However, the interface is flexible enough to allow you to employ consistent hashing or any other scheme if minimal movement is a system requirement.</p> + <ul> + <li>Participant_B fails</li> + </ul> + <div class="source"> + <pre><code>{ + "lock_0": ["Participant_A"], + "lock_1": ["Participant_C"], + "lock_2": ["Participant_A"], + "lock_3": ["Participant_C"], + "lock_4": ["Participant_A"], + "lock_5": ["Participant_C"], +} +</code></pre> + </div> + <p>On any node failure, as in the case of node addition, the rebalancer is invoked automatically so that it can generate a new mapping as a response to the change. Helix ensures that the Rebalancer has the opportunity to reassign locks as required by the application.</p> + <ul> + <li>Participant_B (or the replacement for the original Participant_B) rejoins</li> + </ul> + <div class="source"> + <pre><code>{ + "lock_0": ["Participant_A"], + "lock_1": ["Participant_B"], + "lock_2": ["Participant_C"], + "lock_3": ["Participant_A"], + "lock_4": ["Participant_B"], + "lock_5": ["Participant_C"], +} +</code></pre> + </div> + <p>The rebalancer was invoked once again and the resulting IdealState preference lists reflect the steady state.</p> + </section> + <section> + <h3 id="Caveats">Caveats</h3> + <ul> + <li>The rebalancer class must be available at runtime, or else Helix will not attempt to rebalance at all</li> + <li>The Helix controller will only take into account the preference lists in the new IdealState for this release. In 0.7.0, Helix rebalancers will be able to compute the full resource assignment, including the states.</li> + <li>Helix does not currently persist the new IdealState computed by the user-defined rebalancer. However, the Helix property store is available for saving any computed state. 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id="bannerRight"><img src="" alt='"''"' /></a> + <a href="https://www.apache.org/"; id="bannerRight"><img src="../images/feather_small.gif" alt='"''"' /></a> </div> </div> </div> + </div> <div> <ul class="breadcrumb"> - <li><a href="" title="Apache Helix">Apache Helix </a></li> + <li><a href="http://helix.apache.org/"; title="Apache Helix" class="externalLink">Apache Helix</a></li> <li class="divider">/</li> - <li><a href="" title="Release 1.0.2">Release 1.0.2 </a></li> + <li><a href="../" title="Apache Helix">Apache Helix</a></li> + <li class="divider">/</li> + <li><a href="./" title="Release 1.0.2">Release 1.0.2</a></li> <li class="divider">/</li> <li>Tutorial - YAML Cluster Setup</li> - <li class="publishDate version-date pull-right">Last Published: 2022-04-15</li> + <li class="publishDate version-date pull-right">Last Published: 2022-10-19</li> </ul> </div> </header> @@ -107,94 +141,191 @@ <div class="row"> <div class="span12"> <div class="body-content"> -$bodyWithHeader +<!-- +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. +--> +<section> + <div class="page-header"> + <h2 id="Helix_Tutorial:_YAML_Cluster_Setup"><a href="./Tutorial.html">Helix Tutorial</a>: YAML Cluster Setup</h2> + </div> + <p>As an alternative to using Helix Admin to set up the cluster, its resources, constraints, and the state model, Helix supports bootstrapping a cluster configuration based on a YAML file. Below is an annotated example of such a file for a simple distributed lock manager where a lock can only be LOCKED or RELEASED, and each lock only allows a single participant to hold it in the LOCKED state.</p> + <div class="source"> + <pre><code>clusterName: lock-manager-custom-rebalancer # unique name for the cluster (required) +resources: + - name: lock-group # unique resource name (required) + rebalancer: # required + mode: USER_DEFINED # required - USER_DEFINED means we will provide our own rebalancer + class: org.apache.helix.userdefinedrebalancer.LockManagerRebalancer # required for USER_DEFINED + partitions: + count: 12 # number of partitions for the resource (default is 1) + replicas: 1 # number of replicas per partition (default is 1) + stateModel: + name: lock-unlock # model name (required) + states: [LOCKED, RELEASED, DROPPED] # the list of possible states (required if model not built-in) + transitions: # the list of possible transitions (required if model not built-in) + - name: Unlock + from: LOCKED + to: RELEASED + - name: Lock + from: RELEASED + to: LOCKED + - name: DropLock + from: LOCKED + to: DROPPED + - name: DropUnlock + from: RELEASED + to: DROPPED + - name: Undrop + from: DROPPED + to: RELEASED + initialState: RELEASED # (required if model not built-in) + constraints: + state: + counts: # maximum number of replicas of a partition that can be in each state (required if model not built-in) + - name: LOCKED + count: "1" + - name: RELEASED + count: "-1" + - name: DROPPED + count: "-1" + priorityList: [LOCKED, RELEASED, DROPPED] # states in order of priority (all priorities equal if not specified) + transition: # transitions priority to enforce order that transitions occur + priorityList: [Unlock, Lock, Undrop, DropUnlock, DropLock] # all priorities equal if not specified +participants: # list of nodes that can serve replicas (optional if dynamic joining is active, required otherwise) + - name: localhost_12001 + host: localhost + port: 12001 + - name: localhost_12002 + host: localhost + port: 12002 + - name: localhost_12003 + host: localhost + port: 12003 +</code></pre> + </div> + <p>Using a file like the one above, the cluster can be set up either with the command line:</p> + <div class="source"> + <pre><code>helix/helix-core/target/helix-core/pkg/bin/YAMLClusterSetup.sh localhost:2199 lock-manager-config.yaml +</code></pre> + </div> + <p>or with code:</p> + <div class="source"> + <pre><code>YAMLClusterSetup setup = new YAMLClusterSetup(zkAddress); +InputStream input = + Thread.currentThread().getContextClassLoader() + .getResourceAsStream("lock-manager-config.yaml"); +YAMLClusterSetup.YAMLClusterConfig config = setup.setupCluster(input); +</code></pre> + </div> + <p>Some notes:</p> + <ul> + <li> <p>A rebalancer class is only required for the USER_DEFINED mode. It is ignored otherwise.</p> </li> + <li> <p>Built-in state models, like OnlineOffline, LeaderStandby, and MasterSlave, or state models that have already been added only require a name for stateModel. 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