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Posted to commits@helix.apache.org by jx...@apache.org on 2022/05/12 05:34:05 UTC
svn commit: r1900824 [9/14] - in /helix/site-content: ./ 1.0.4-docs/ 1.0.4-docs/css/ 1.0.4-docs/images/ 1.0.4-docs/images/design/ 1.0.4-docs/images/design/crushed/ 1.0.4-docs/img/ 1.0.4-docs/js/ 1.0.4-docs/recipes/ 1.0.4-docs/releasenotes/
Added: helix/site-content/1.0.4-docs/tutorial_admin.html
URL: http://svn.apache.org/viewvc/helix/site-content/1.0.4-docs/tutorial_admin.html?rev=1900824&view=auto
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--- helix/site-content/1.0.4-docs/tutorial_admin.html (added)
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+
+<!DOCTYPE html>
+
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+
+
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+
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+ <title>Apache Helix – Tutorial - Admin Operations</title>
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+ <a href="http://helix.apache.org/" id="bannerLeft"><img src="../images/helix-logo.jpg" alt='"''"' /></a>
+ <p class="lead">A cluster management framework for partitioned and replicated distributed resources</p>
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+ <a href="http://www.apache.org/" id="bannerRight"><img src="../images/feather_small.gif" alt='"''"' /></a>
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+ <li><a href="../" title="Apache Helix">Apache Helix</a></li>
+ <li class="divider">/</li>
+ <li><a href="../1.0.4-docs/" title="Release 1.0.4">Release 1.0.4</a></li>
+ <li class="divider">/</li>
+ <li>Tutorial - Admin Operations</li>
+ <li class="publishDate version-date pull-right">Last Published: 2022-05-11</li>
+ </ul>
+ </div>
+ </header>
+
+ <div class="main-body">
+ <div class="row">
+ <div class="span12">
+ <div class="body-content">
+<!--
+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:_Admin_Operations"><a href="./Tutorial.html">Helix Tutorial</a>: Admin Operations</h2>
+ </div>
+ <p>Helix provides a set of admin APIs for cluster management operations. They are supported via:</p>
+ <ul>
+ <li>Java API</li>
+ <li>Command Line Interface</li>
+ <li>REST Interface via helix-admin-webapp</li>
+ </ul>
+ <section>
+ <h3 id="Java_API">Java API</h3>
+ <p>See interface <a class="externalLink" href="http://helix.apache.org/javadocs/1.0.4/reference/org/apache/helix/HelixAdmin.html"><i>org.apache.helix.HelixAdmin</i></a></p>
+ </section>
+ <section>
+ <h3 id="Command_Line_Interface">Command Line Interface</h3>
+ <p>The command line tool comes with helix-core package:</p>
+ <p>Get the command line tool:</p>
+ <div class="source">
+ <pre><code>git clone https://git-wip-us.apache.org/repos/asf/helix.git
+cd helix
+git checkout tags/helix-1.0.4
+./build
+cd helix-core/target/helix-core-pkg/bin
+chmod +x *.sh
+</code></pre>
+ </div>
+ <p>Get help:</p>
+ <div class="source">
+ <pre><code>./helix-admin.sh --help
+</code></pre>
+ </div>
+ <p>All other commands have this form:</p>
+ <div class="source">
+ <pre><code>./helix-admin.sh --zkSvr <ZookeeperServerAddress> <command> <parameters>
+</code></pre>
+ </div>
+ <section>
+ <h4 id="Supported_Commands">Supported Commands</h4>
+ <table border="0" class="bodyTable table table-striped table-hover">
+ <thead>
+ <tr class="a">
+ <th>Command Syntax</th>
+ <th>Description</th>
+ </tr>
+ </thead>
+ <tbody>
+ <tr class="b">
+ <td align="left"><i>--activateCluster <clusterName controllerCluster true/false></i></td>
+ <td>Enable/disable a cluster in distributed controller mode</td>
+ </tr>
+ <tr class="a">
+ <td align="left"><i>--addCluster <clusterName></i></td>
+ <td>Add a new cluster</td>
+ </tr>
+ <tr class="b">
+ <td align="left"><i>--addIdealState <clusterName resourceName fileName.json></i></td>
+ <td>Add an ideal state to a cluster</td>
+ </tr>
+ <tr class="a">
+ <td align="left"><i>--addInstanceTag <clusterName instanceName tag></i></td>
+ <td>Add a tag to an instance</td>
+ </tr>
+ <tr class="b">
+ <td align="left"><i>--addNode <clusterName instanceId></i></td>
+ <td>Add an instance to a cluster</td>
+ </tr>
+ <tr class="a">
+ <td align="left"><i>--addResource <clusterName resourceName partitionNumber stateModelName></i></td>
+ <td>Add a new resource to a cluster</td>
+ </tr>
+ <tr class="b">
+ <td align="left"><i>--addResourceProperty <clusterName resourceName propertyName propertyValue></i></td>
+ <td>Add a resource property</td>
+ </tr>
+ <tr class="a">
+ <td align="left"><i>--addStateModelDef <clusterName fileName.json></i></td>
+ <td>Add a State model definition to a cluster</td>
+ </tr>
+ <tr class="b">
+ <td align="left"><i>--dropCluster <clusterName></i></td>
+ <td>Delete a cluster</td>
+ </tr>
+ <tr class="a">
+ <td align="left"><i>--dropNode <clusterName instanceId></i></td>
+ <td>Remove a node from a cluster</td>
+ </tr>
+ <tr class="b">
+ <td align="left"><i>--dropResource <clusterName resourceName></i></td>
+ <td>Remove an existing resource from a cluster</td>
+ </tr>
+ <tr class="a">
+ <td align="left"><i>--enableCluster <clusterName true/false></i></td>
+ <td>Enable/disable a cluster</td>
+ </tr>
+ <tr class="b">
+ <td align="left"><i>--enableInstance <clusterName instanceId true/false></i></td>
+ <td>Enable/disable an instance</td>
+ </tr>
+ <tr class="a">
+ <td align="left"><i>--enablePartition <true/false clusterName nodeId resourceName partitionName></i></td>
+ <td>Enable/disable a partition</td>
+ </tr>
+ <tr class="b">
+ <td align="left"><i>--getConfig <configScope configScopeArgs configKeys></i></td>
+ <td>Get user configs</td>
+ </tr>
+ <tr class="a">
+ <td align="left"><i>--getConstraints <clusterName constraintType></i></td>
+ <td>Get constraints</td>
+ </tr>
+ <tr class="b">
+ <td align="left"><i>--help</i></td>
+ <td>print help information</td>
+ </tr>
+ <tr class="a">
+ <td align="left"><i>--instanceGroupTag <instanceTag></i></td>
+ <td>Specify instance group tag, used with rebalance command</td>
+ </tr>
+ <tr class="b">
+ <td align="left"><i>--listClusterInfo <clusterName></i></td>
+ <td>Show information of a cluster</td>
+ </tr>
+ <tr class="a">
+ <td align="left"><i>--listClusters</i></td>
+ <td>List all clusters</td>
+ </tr>
+ <tr class="b">
+ <td align="left"><i>--listInstanceInfo <clusterName instanceId></i></td>
+ <td>Show information of an instance</td>
+ </tr>
+ <tr class="a">
+ <td align="left"><i>--listInstances <clusterName></i></td>
+ <td>List all instances in a cluster</td>
+ </tr>
+ <tr class="b">
+ <td align="left"><i>--listPartitionInfo <clusterName resourceName partitionName></i></td>
+ <td>Show information of a partition</td>
+ </tr>
+ <tr class="a">
+ <td align="left"><i>--listResourceInfo <clusterName resourceName></i></td>
+ <td>Show information of a resource</td>
+ </tr>
+ <tr class="b">
+ <td align="left"><i>--listResources <clusterName></i></td>
+ <td>List all resources in a cluster</td>
+ </tr>
+ <tr class="a">
+ <td align="left"><i>--listStateModel <clusterName stateModelName></i></td>
+ <td>Show information of a state model</td>
+ </tr>
+ <tr class="b">
+ <td align="left"><i>--listStateModels <clusterName></i></td>
+ <td>List all state models in a cluster</td>
+ </tr>
+ <tr class="a">
+ <td align="left"><i>--maxPartitionsPerNode <maxPartitionsPerNode></i></td>
+ <td>Specify the max partitions per instance, used with addResourceGroup command</td>
+ </tr>
+ <tr class="b">
+ <td align="left"><i>--rebalance <clusterName resourceName replicas></i></td>
+ <td>Rebalance a resource</td>
+ </tr>
+ <tr class="a">
+ <td align="left"><i>--removeConfig <configScope configScopeArgs configKeys></i></td>
+ <td>Remove user configs</td>
+ </tr>
+ <tr class="b">
+ <td align="left"><i>--removeConstraint <clusterName constraintType constraintId></i></td>
+ <td>Remove a constraint</td>
+ </tr>
+ <tr class="a">
+ <td align="left"><i>--removeInstanceTag <clusterName instanceId tag></i></td>
+ <td>Remove a tag from an instance</td>
+ </tr>
+ <tr class="b">
+ <td align="left"><i>--removeResourceProperty <clusterName resourceName propertyName></i></td>
+ <td>Remove a resource property</td>
+ </tr>
+ <tr class="a">
+ <td align="left"><i>--resetInstance <clusterName instanceId></i></td>
+ <td>Reset all erroneous partitions on an instance</td>
+ </tr>
+ <tr class="b">
+ <td align="left"><i>--resetPartition <clusterName instanceId resourceName partitionName></i></td>
+ <td>Reset an erroneous partition</td>
+ </tr>
+ <tr class="a">
+ <td align="left"><i>--resetResource <clusterName resourceName></i></td>
+ <td>Reset all erroneous partitions of a resource</td>
+ </tr>
+ <tr class="b">
+ <td align="left"><i>--setConfig <configScope configScopeArgs configKeyValueMap></i></td>
+ <td>Set user configs</td>
+ </tr>
+ <tr class="a">
+ <td align="left"><i>--setConstraint <clusterName constraintType constraintId constraintKeyValueMap></i></td>
+ <td>Set a constraint</td>
+ </tr>
+ <tr class="b">
+ <td align="left"><i>--swapInstance <clusterName oldInstance newInstance></i></td>
+ <td>Swap an old instance with a new instance</td>
+ </tr>
+ <tr class="a">
+ <td align="left"><i>--zkSvr <ZookeeperServerAddress></i></td>
+ <td>Provide zookeeper address</td>
+ </tr>
+ </tbody>
+ </table>
+ </section>
+ </section>
+ <section>
+ <h3 id="REST_Interface">REST Interface</h3>
+ <p>The REST interface comes wit helix-admin-webapp package:</p>
+ <div class="source">
+ <pre><code>git clone https://git-wip-us.apache.org/repos/asf/helix.git
+cd helix
+git checkout tags/helix-1.0.4
+./build
+cd helix-admin-webapp/target/helix-admin-webapp-pkg/bin
+chmod +x *.sh
+./run-rest-admin.sh --zkSvr <zookeeperAddress> --port <port> // make sure ZooKeeper is running
+</code></pre>
+ </div>
+ <section>
+ <h4 id="URL_and_support_methods">URL and support methods</h4>
+ <ul>
+ <li> <p><i>/clusters</i></p>
+ <ul>
+ <li>List all clusters</li>
+ </ul>
+ <div class="source">
+ <pre><code>curl http://localhost:8100/clusters
+</code></pre>
+ </div>
+ <ul>
+ <li>Add a cluster</li>
+ </ul>
+ <div class="source">
+ <pre><code>curl -d 'jsonParameters={"command":"addCluster","clusterName":"MyCluster"}' -H "Content-Type: application/json" http://localhost:8100/clusters
+</code></pre>
+ </div> </li>
+ <li> <p><i>/clusters/{clusterName}</i></p>
+ <ul>
+ <li>List cluster information</li>
+ </ul>
+ <div class="source">
+ <pre><code>curl http://localhost:8100/clusters/MyCluster
+</code></pre>
+ </div>
+ <ul>
+ <li>Enable/disable a cluster in distributed controller mode</li>
+ </ul>
+ <div class="source">
+ <pre><code>curl -d 'jsonParameters={"command":"activateCluster","grandCluster":"MyControllerCluster","enabled":"true"}' -H "Content-Type: application/json" http://localhost:8100/clusters/MyCluster
+</code></pre>
+ </div>
+ <ul>
+ <li>Remove a cluster</li>
+ </ul>
+ <div class="source">
+ <pre><code>curl -X DELETE http://localhost:8100/clusters/MyCluster
+</code></pre>
+ </div> </li>
+ <li> <p><i>/clusters/{clusterName}/resourceGroups</i></p>
+ <ul>
+ <li>List all resources in a cluster</li>
+ </ul>
+ <div class="source">
+ <pre><code>curl http://localhost:8100/clusters/MyCluster/resourceGroups
+</code></pre>
+ </div>
+ <ul>
+ <li>Add a resource to cluster</li>
+ </ul>
+ <div class="source">
+ <pre><code>curl -d 'jsonParameters={"command":"addResource","resourceGroupName":"MyDB","partitions":"8","stateModelDefRef":"LeaderStandby" }' -H "Content-Type: application/json" http://localhost:8100/clusters/MyCluster/resourceGroups
+</code></pre>
+ </div> </li>
+ <li> <p><i>/clusters/{clusterName}/resourceGroups/{resourceName}</i></p>
+ <ul>
+ <li>List resource information</li>
+ </ul>
+ <div class="source">
+ <pre><code>curl http://localhost:8100/clusters/MyCluster/resourceGroups/MyDB
+</code></pre>
+ </div>
+ <ul>
+ <li>Drop a resource</li>
+ </ul>
+ <div class="source">
+ <pre><code>curl -X DELETE http://localhost:8100/clusters/MyCluster/resourceGroups/MyDB
+</code></pre>
+ </div>
+ <ul>
+ <li>Reset all erroneous partitions of a resource</li>
+ </ul>
+ <div class="source">
+ <pre><code>curl -d 'jsonParameters={"command":"resetResource"}' -H "Content-Type: application/json" http://localhost:8100/clusters/MyCluster/resourceGroups/MyDB
+</code></pre>
+ </div> </li>
+ <li> <p><i>/clusters/{clusterName}/resourceGroups/{resourceName}/idealState</i></p>
+ <ul>
+ <li>Rebalance a resource</li>
+ </ul>
+ <div class="source">
+ <pre><code>curl -d 'jsonParameters={"command":"rebalance","replicas":"3"}' -H "Content-Type: application/json" http://localhost:8100/clusters/MyCluster/resourceGroups/MyDB/idealState
+</code></pre>
+ </div>
+ <ul>
+ <li>Add an ideal state</li>
+ </ul>
+ <div class="source">
+ <pre><code>echo jsonParameters={
+"command":"addIdealState"
+ }&newIdealState={
+ "id" : "MyDB",
+ "simpleFields" : {
+ "IDEAL_STATE_MODE" : "AUTO",
+ "NUM_PARTITIONS" : "8",
+ "REBALANCE_MODE" : "SEMI_AUTO",
+ "REPLICAS" : "0",
+ "STATE_MODEL_DEF_REF" : "LeaderStandby",
+ "STATE_MODEL_FACTORY_NAME" : "DEFAULT"
+ },
+ "listFields" : {
+ },
+ "mapFields" : {
+ "MyDB_0" : {
+ "localhost_1001" : "LEADER",
+ "localhost_1002" : "STANDBY"
+ }
+ }
+}
+> newIdealState.json
+curl -d @'./newIdealState.json' -H 'Content-Type: application/json' http://localhost:8100/clusters/MyCluster/resourceGroups/MyDB/idealState
+</code></pre>
+ </div>
+ <ul>
+ <li>Add resource property</li>
+ </ul>
+ <div class="source">
+ <pre><code>curl -d 'jsonParameters={"command":"addResourceProperty","REBALANCE_TIMER_PERIOD":"500"}' -H "Content-Type: application/json" http://localhost:8100/clusters/MyCluster/resourceGroups/MyDB/idealState
+</code></pre>
+ </div> </li>
+ <li> <p><i>/clusters/{clusterName}/resourceGroups/{resourceName}/externalView</i></p>
+ <ul>
+ <li>Show resource external view</li>
+ </ul>
+ <div class="source">
+ <pre><code>curl http://localhost:8100/clusters/MyCluster/resourceGroups/MyDB/externalView
+</code></pre>
+ </div> </li>
+ <li> <p><i>/clusters/{clusterName}/instances</i></p>
+ <ul>
+ <li>List all instances</li>
+ </ul>
+ <div class="source">
+ <pre><code>curl http://localhost:8100/clusters/MyCluster/instances
+</code></pre>
+ </div>
+ <ul>
+ <li>Add an instance</li>
+ </ul>
+ <div class="source">
+ <pre><code>curl -d 'jsonParameters={"command":"addInstance","instanceNames":"localhost_1001"}' -H "Content-Type: application/json" http://localhost:8100/clusters/MyCluster/instances
+</code></pre>
+ </div>
+ <ul>
+ <li>Swap an instance</li>
+ </ul>
+ <div class="source">
+ <pre><code>curl -d 'jsonParameters={"command":"swapInstance","oldInstance":"localhost_1001", "newInstance":"localhost_1002"}' -H "Content-Type: application/json" http://localhost:8100/clusters/MyCluster/instances
+</code></pre>
+ </div> </li>
+ <li> <p><i>/clusters/{clusterName}/instances/{instanceName}</i></p>
+ <ul>
+ <li>Show instance information</li>
+ </ul>
+ <div class="source">
+ <pre><code>curl http://localhost:8100/clusters/MyCluster/instances/localhost_1001
+</code></pre>
+ </div>
+ <ul>
+ <li>Enable/disable an instance</li>
+ </ul>
+ <div class="source">
+ <pre><code>curl -d 'jsonParameters={"command":"enableInstance","enabled":"false"}' -H "Content-Type: application/json" http://localhost:8100/clusters/MyCluster/instances/localhost_1001
+</code></pre>
+ </div>
+ <ul>
+ <li>Drop an instance</li>
+ </ul>
+ <div class="source">
+ <pre><code>curl -X DELETE http://localhost:8100/clusters/MyCluster/instances/localhost_1001
+</code></pre>
+ </div>
+ <ul>
+ <li>Disable/enable partitions on an instance</li>
+ </ul>
+ <div class="source">
+ <pre><code>curl -d 'jsonParameters={"command":"enablePartition","resource": "MyDB","partition":"MyDB_0", "enabled" : "false"}' -H "Content-Type: application/json" http://localhost:8100/clusters/MyCluster/instances/localhost_1001
+</code></pre>
+ </div>
+ <ul>
+ <li>Reset an erroneous partition on an instance</li>
+ </ul>
+ <div class="source">
+ <pre><code>curl -d 'jsonParameters={"command":"resetPartition","resource": "MyDB","partition":"MyDB_0"}' -H "Content-Type: application/json" http://localhost:8100/clusters/MyCluster/instances/localhost_1001
+</code></pre>
+ </div>
+ <ul>
+ <li>Reset all erroneous partitions on an instance</li>
+ </ul>
+ <div class="source">
+ <pre><code>curl -d 'jsonParameters={"command":"resetInstance"}' -H "Content-Type: application/json" http://localhost:8100/clusters/MyCluster/instances/localhost_1001
+</code></pre>
+ </div> </li>
+ <li> <p><i>/clusters/{clusterName}/configs</i></p>
+ <ul>
+ <li>Get user cluster level config</li>
+ </ul>
+ <div class="source">
+ <pre><code>curl http://localhost:8100/clusters/MyCluster/configs/cluster
+</code></pre>
+ </div>
+ <ul>
+ <li>Set user cluster level config</li>
+ </ul>
+ <div class="source">
+ <pre><code>curl -d 'jsonParameters={"command":"setConfig","configs":"key1=value1,key2=value2"}' -H "Content-Type: application/json" http://localhost:8100/clusters/MyCluster/configs/cluster
+</code></pre>
+ </div>
+ <ul>
+ <li>Remove user cluster level config</li>
+ </ul>
+ <div class="source">
+ <pre><code>curl -d 'jsonParameters={"command":"removeConfig","configs":"key1,key2"}' -H "Content-Type: application/json" http://localhost:8100/clusters/MyCluster/configs/cluster
+</code></pre>
+ </div>
+ <ul>
+ <li>Get/set/remove user participant level config</li>
+ </ul>
+ <div class="source">
+ <pre><code>curl -d 'jsonParameters={"command":"setConfig","configs":"key1=value1,key2=value2"}' -H "Content-Type: application/json" http://localhost:8100/clusters/MyCluster/configs/participant/localhost_1001
+</code></pre>
+ </div>
+ <ul>
+ <li>Get/set/remove resource level config</li>
+ </ul>
+ <div class="source">
+ <pre><code>curl -d 'jsonParameters={"command":"setConfig","configs":"key1=value1,key2=value2"}' -H "Content-Type: application/json" http://localhost:8100/clusters/MyCluster/configs/resource/MyDB
+</code></pre>
+ </div> </li>
+ <li> <p><i>/clusters/{clusterName}/controller</i></p>
+ <ul>
+ <li>Show controller information</li>
+ </ul>
+ <div class="source">
+ <pre><code>curl http://localhost:8100/clusters/MyCluster/Controller
+</code></pre>
+ </div>
+ <ul>
+ <li>Enable/disable cluster</li>
+ </ul>
+ <div class="source">
+ <pre><code>curl -d 'jsonParameters={"command":"enableCluster","enabled":"false"}' -H "Content-Type: application/json" http://localhost:8100/clusters/MyCluster/Controller
+</code></pre>
+ </div> </li>
+ <li> <p><i>/zkPath/{path}</i></p>
+ <ul>
+ <li>Get information for zookeeper path</li>
+ </ul>
+ <div class="source">
+ <pre><code>curl http://localhost:8100/zkPath/MyCluster
+</code></pre>
+ </div> </li>
+ <li> <p><i>/clusters/{clusterName}/StateModelDefs</i></p>
+ <ul>
+ <li>Show all state model definitions</li>
+ </ul>
+ <div class="source">
+ <pre><code>curl http://localhost:8100/clusters/MyCluster/StateModelDefs
+</code></pre>
+ </div>
+ <ul>
+ <li>Add a state mdoel definition</li>
+ </ul>
+ <div class="source">
+ <pre><code>echo jsonParameters={
+ "command":"addStateModelDef"
+}&newStateModelDef={
+ "id" : "OnlineOffline",
+ "simpleFields" : {
+ "INITIAL_STATE" : "OFFLINE"
+ },
+ "listFields" : {
+ "STATE_PRIORITY_LIST" : [ "ONLINE", "OFFLINE", "DROPPED" ],
+ "STATE_TRANSITION_PRIORITYLIST" : [ "OFFLINE-ONLINE", "ONLINE-OFFLINE", "OFFLINE-DROPPED" ]
+ },
+ "mapFields" : {
+ "DROPPED.meta" : {
+ "count" : "-1"
+ },
+ "OFFLINE.meta" : {
+ "count" : "-1"
+ },
+ "OFFLINE.next" : {
+ "DROPPED" : "DROPPED",
+ "ONLINE" : "ONLINE"
+ },
+ "ONLINE.meta" : {
+ "count" : "R"
+ },
+ "ONLINE.next" : {
+ "DROPPED" : "OFFLINE",
+ "OFFLINE" : "OFFLINE"
+ }
+ }
+}
+> newStateModelDef.json
+curl -d @'./untitled.txt' -H 'Content-Type: application/json' http://localhost:8100/clusters/MyCluster/StateModelDefs
+</code></pre>
+ </div> </li>
+ <li> <p><i>/clusters/{clusterName}/StateModelDefs/{stateModelDefName}</i></p>
+ <ul>
+ <li>Show a state model definition</li>
+ </ul>
+ <div class="source">
+ <pre><code>curl http://localhost:8100/clusters/MyCluster/StateModelDefs/OnlineOffline
+</code></pre>
+ </div> </li>
+ <li> <p><i>/clusters/{clusterName}/constraints/{constraintType}</i></p>
+ <ul>
+ <li>Show all contraints</li>
+ </ul>
+ <div class="source">
+ <pre><code>curl http://localhost:8100/clusters/MyCluster/constraints/MESSAGE_CONSTRAINT
+</code></pre>
+ </div>
+ <ul>
+ <li>Set a contraint</li>
+ </ul>
+ <div class="source">
+ <pre><code>curl -d 'jsonParameters={"constraintAttributes":"RESOURCE=MyDB,CONSTRAINT_VALUE=1"}' -H "Content-Type: application/json" http://localhost:8100/clusters/MyCluster/constraints/MESSAGE_CONSTRAINT/MyConstraint
+</code></pre>
+ </div>
+ <ul>
+ <li>Remove a constraint</li>
+ </ul>
+ <div class="source">
+ <pre><code>curl -X DELETE http://localhost:8100/clusters/MyCluster/constraints/MESSAGE_CONSTRAINT/MyConstraint
+</code></pre>
+ </div> </li>
+ </ul>
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+ <li>Tutorial - Helix Agent</li>
+ <li class="publishDate version-date pull-right">Last Published: 2022-05-11</li>
+ </ul>
+ </div>
+ </header>
+
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+ <div class="span12">
+ <div class="body-content">
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+"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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+Unless required by applicable law or agreed to in writing,
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+<section>
+ <div class="page-header">
+ <h2 id="Helix_Tutorial:_Helix_Agent_.28for_non-JVM_systems.29"><a href="./Tutorial.html">Helix Tutorial</a>: Helix Agent (for non-JVM systems)</h2>
+ </div>
+ <p>Not every distributed system is written on the JVM, but many systems would benefit from the cluster management features that Helix provides. To make a non-JVM system work with Helix, you can use the Helix Agent module.</p>
+ <section>
+ <h3 id="What_is_Helix_Agent.3F">What is Helix Agent?</h3>
+ <p>Helix is built on the following assumption: if your distributed resource is modeled by a finite state machine, then Helix can tell participants when they should transition between states. In the Java API, this means implementing transition callbacks. In the Helix agent API, this means providing commands than can run for each transition.</p>
+ <p>These commands could do anything behind the scenes; Helix only requires that they exit once the state transition is complete.</p>
+ </section>
+ <section>
+ <h3 id="Configuring_Transition_Commands">Configuring Transition Commands</h3>
+ <p>Here's how to tell Helix which commands to run on state transitions:</p>
+ <section>
+ <h4 id="Java">Java</h4>
+ <p>Using the Java API, first get a configuration scope (the Helix agent supports both cluster and resource scopes, picking resource first if it is available):</p>
+ <div class="source">
+ <pre><code>// Cluster scope
+HelixConfigScope scope =
+ new HelixConfigScopeBuilder(ConfigScopeProperty.CLUSTER).forCluster(clusterName).build();
+
+// Resource scope
+HelixConfigScope scope =
+ new HelixConfigScopeBuilder(ConfigScopeProperty.RESOURCE).forCluster(clusterName).forResource(resourceName).build();
+</code></pre>
+ </div>
+ <p>Then, specify the command to run for each state transition:</p>
+ <div class="source">
+ <pre><code>// Get the configuration accessor
+ConfigAccessor configAccessor = new ConfigAccessor(_gZkClient);
+
+// Specify the script for OFFLINE --> ONLINE
+CommandConfig.Builder builder = new CommandConfig.Builder();
+CommandConfig cmdConfig =
+ builder.setTransition("OFFLINE", "ONLINE").setCommand("simpleHttpClient.py OFFLINE-ONLINE")
+ .setCommandWorkingDir(workingDir)
+ .setCommandTimeout("5000L") // optional: ms to wait before failing
+ .setPidFile(pidFile) // optional: for daemon-like systems that will write the process id to a file
+ .build();
+configAccessor.set(scope, cmdConfig.toKeyValueMap());
+
+// Specify the script for ONLINE --> OFFLINE
+builder = new CommandConfig.Builder();
+cmdConfig =
+ builder.setTransition("ONLINE", "OFFLINE").setCommand("simpleHttpClient.py ONLINE-OFFLINE")
+ .setCommandWorkingDir(workingDir)
+ .build();
+configAccessor.set(scope, cmdConfig.toKeyValueMap());
+
+// Specify NOP for OFFLINE --> DROPPED
+builder = new CommandConfig.Builder();
+cmdConfig =
+ builder.setTransition("OFFLINE", "DROPPED")
+ .setCommand(CommandAttribute.NOP.getName())
+ .build();
+configAccessor.set(scope, cmdConfig.toKeyValueMap());
+</code></pre>
+ </div>
+ <p>In this example, we have a program called simpleHttpClient.py that we call for all transitions, only changing the arguments that are passed in. However, there is no requirement that each transition invoke the same program; this API allows running arbitrary commands in arbitrary directories with arbitrary arguments.</p>
+ <p>Notice that that for the OFFLINE --> DROPPED transition, we do not run any command (specifically, we specify the NOP command). This just tells Helix that the system doesn't care about when things are dropped, and it can consider the transition already done.</p>
+ </section>
+ <section>
+ <h4 id="Command_Line">Command Line</h4>
+ <p>It is also possible to configure everything directly from the command line. Here's how that would look for cluster-wide configuration:</p>
+ <div class="source">
+ <pre><code># Specify the script for OFFLINE --> ONLINE
+/helix-admin.sh --zkSvr localhost:2181 --setConfig CLUSTER clusterName OFFLINE-ONLINE.command="simpleHttpClient.py OFFLINE-ONLINE",OFFLINE-ONLINE.command.workingDir="/path/to/script", OFFLINE-ONLINE.command.pidfile="/path/to/pidfile"
+
+# Specify the script for ONLINE --> OFFLINE
+/helix-admin.sh --zkSvr localhost:2181 --setConfig CLUSTER clusterName ONLINE-OFFLINE.command="simpleHttpClient.py ONLINE-OFFLINE",ONLINE-OFFLINE.workingDir="/path/to/script", OFFLINE-ONLINE.command.pidfile="/path/to/pidfile"
+
+# Specify NOP for OFFLINE --> DROPPED
+/helix-admin.sh --zkSvr localhost:2181 --setConfig CLUSTER clusterName ONLINE-OFFLINE.command="nop"
+</code></pre>
+ </div>
+ <p>Like in the Java configuration, it is also possible to specify a resource scope instead of a cluster scope:</p>
+ <div class="source">
+ <pre><code># Specify the script for OFFLINE --> ONLINE
+/helix-admin.sh --zkSvr localhost:2181 --setConfig RESOURCE clusterName,resourceName OFFLINE-ONLINE.command="simpleHttpClient.py OFFLINE-ONLINE",OFFLINE-ONLINE.command.workingDir="/path/to/script", OFFLINE-ONLINE.command.pidfile="/path/to/pidfile"
+</code></pre>
+ </div>
+ </section>
+ </section>
+ <section>
+ <h3 id="Starting_the_Agent">Starting the Agent</h3>
+ <p>There should be an agent running for every participant you have running. Ideally, its lifecycle should match that of the participant. Here, we have a simple long-running participant called simpleHttpServer.py. Its only purpose is to record state transitions.</p>
+ <p>Here are some ways that you can start the Helix agent:</p>
+ <section>
+ <h4 id="Java">Java</h4>
+ <div class="source">
+ <pre><code>// Start your application process
+ExternalCommand serverCmd = ExternalCommand.start(workingDir + "/simpleHttpServer.py");
+
+// Start the agent
+Thread agentThread = new Thread() {
+ @Override
+ public void run() {
+ while(!isInterrupted()) {
+ try {
+ HelixAgentMain.main(new String[] {
+ "--zkSvr", zkAddr, "--cluster", clusterName, "--instanceName", instanceName,
+ "--stateModel", "OnlineOffline"
+ });
+ } catch (InterruptedException e) {
+ LOG.info("Agent thread interrupted", e);
+ interrupt();
+ } catch (Exception e) {
+ LOG.error("Exception start helix-agent", e);
+ }
+ }
+ }
+};
+agentThread.start();
+
+// Wait for the process to terminate (either intentionally or unintentionally)
+serverCmd.waitFor();
+
+// Kill the agent
+agentThread.interrupt();
+</code></pre>
+ </div>
+ </section>
+ <section>
+ <h4 id="Command_Line">Command Line</h4>
+ <div class="source">
+ <pre><code># Build Helix and start the agent
+mvn clean install -DskipTests
+chmod +x helix-agent/target/helix-agent-pkg/bin/*
+helix-agent/target/helix-agent-pkg/bin/start-helix-agent.sh --zkSvr zkAddr1,zkAddr2 --cluster clusterName --instanceName instanceName --stateModel OnlineOffline
+
+# Here, you can define your own logic to terminate this agent when your process terminates
+...
+</code></pre>
+ </div>
+ </section>
+ </section>
+ <section>
+ <h3 id="Example">Example</h3>
+ <p><a class="externalLink" href="https://git-wip-us.apache.org/repos/asf?p=helix.git;a=blob;f=helix-agent/src/test/java/org/apache/helix/agent/TestHelixAgent.java;h=ccf64ce5544207c7e48261682ea69945b71da7f1;hb=refs/heads/master">Here</a> is a basic system that uses the Helix agent package.</p>
+ </section>
+ <section>
+ <h3 id="Notes">Notes</h3>
+ <p>As you may have noticed from the examples, the participant program and the state transition program are two different programs. The former is a <i>long-running</i> process that is directly tied to the Helix agent. The latter is a process that only exists while a state transition is underway. Despite this, these two processes should be intertwined. The transition command will need to communicate to the participant to actually complete the state transition and the participant will need to communicate whether or not this was successful. The implementation of this protocol is the responsibility of the system.</p>
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+ <li>Tutorial - Cloud Support</li>
+ <li class="publishDate version-date pull-right">Last Published: 2022-05-11</li>
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+<section>
+ <div class="page-header">
+ <h2 id="Helix_Tutorial:_Cloud_Support"><a href="./Tutorial.html">Helix Tutorial</a>: Cloud Support</h2>
+ </div>
+ <p>There are emerging cases to use Helix in a cloud environment, especially in those well-known public cloud, e.g. Azure, AWS, GCP, etc. Compared to previous on premise use cases, Helix has faced both challenges and opportunities in providing cloud related support.</p>
+ <p>As a first step, Helix implemented the support for participant auto registration in a cloud environment, which leverages the common feature of public cloud and facilitates Helix users when they need to create a cluster and register the participants to the cluster.</p>
+ <p>After a Helix cluster is created, there are two ways to add instances (or participants, we will use them interchangeably in this tutorial) to the cluster. One is manual add, where users call their own scripts to add instance config to the cluster for each participant; and the other is auto join, where users set the auto join config of the cluster to be true, and each participant populates its own hostname, port number, and other information in instance config during connection. However, in an on premise environment, the auto join only works perfectly when users use Helix in a non rack-aware environment, meaning there is no fault domain concept. For a rack-aware environment, users still need to manually input the domain information to the instance config as it is hard for each participant to get its own fault domain information. Considering most users would use Helix in a rack-aware environment, it means manual work is still required.</p>
+ <p>In a cloud environment, there is a good opportunity to achieve full automation as public cloud providers give domain information to each individual instance through a metadata endpoint. All of the above mentioned public cloud providers use a unique non-routable IP address (169.254.169.254) for this purpose. It can be accessed only from within the instance to retrieve the instance metadata information, which you can use to configure or manage the running instance.</p>
+ <p>More specifically, in AWS, Azure, and GCP, the query to the fixed IP address <a class="externalLink" href="http://169.254.169.254/">http://169.254.169.254/</a> inside each instance will return its metadata information that contains domain information. In AWS, the field is named as âplacementâ; in Azure, the field is named as âPlatformUpdateDomainâ; and in GCP, the field is named as âzoneâ. It is usually just an integer denoting which fault domain the instance belongs to. This particular feature of public cloud is leveraged by Helix in cluster creation and partition registration process.</p>
+ <section>
+ <h3 id="What_Helix_Provides_for_Cloud_Environment">What Helix Provides for Cloud Environment</h3>
+ <ul>
+ <li>Provide definition of Helix cloud configs at cluster level and participant level</li>
+ <li>Provide enhanced REST and Java APIs for cluster creation and cloud config update</li>
+ <li>Provide generic interface for fetching and parsing cloud instance information</li>
+ <li>Provide the implementation of Azure cloud instance information processor</li>
+ <li>Provide the implementation of participant auto registration logic</li>
+ </ul>
+ </section>
+ <section>
+ <h3 id="How_to_Use_Cloud_Support">How to Use Cloud Support</h3>
+ <p>First of all, you need to make sure that your environment is indeed a cloud environment. Otherwise, all the assumptions in this support will not hold. Then depending on what kind of cloud environment you are in, you will need to perform some or all of the following steps.</p>
+ <section>
+ <h4 id="Define_Cloud_config_at_Cluster_Level">Define Cloud config at Cluster Level</h4>
+ <p>Helix provides cloud configs at two different levels, one is at cluster level, and the other is at participant level. We describe them separately.</p>
+ <p>At cluster level, we have a new Znode called CloudConfig. It has a few fields that store the relatively static cloud information for the whole cluster. Similar to other existing configs, Helix provides cloud config builder, validation, get/set functions. As the following table shows, the first two fields are required, and the last three fields are optional.</p>
+ <p><code>CLOUD_ENABLED</code> must be set to true if the user would like to use Helix cloud support. <code>CLOUD_PROVIDER</code> is the type of the cloud environment. Besides the few well-known public cloud providers, the user can also define his/her cloud environment as âCUSTOMIZEDâ. <code>CLOUD_ID</code> is an optional field. It can be used to record any specific metadata information the user would like to record, e.g. the ID for the particular cluster inside a cloud environment, etc. If the user chooses to use the provider that already has default implementations in Helix, e.g., Azure, he does not need to provide the last two fields, as Helix already provides the default value for these two fields in system property, which is considered as a bundle with Azure implementation that would be discussed later. If the user uses customized providers, or chooses some other cloud environment that has not been implemented in Helix yet, the user needs to provide the last two fie
lds and/or <code>CLOUD_ID</code> depending on his/her usage.</p>
+ <table border="0" class="bodyTable table table-striped table-hover">
+ <thead>
+ <tr class="a">
+ <th>Field</th>
+ <th>Meaning</th>
+ </tr>
+ </thead>
+ <tbody>
+ <tr class="b">
+ <td align="left">CLOUD_ENABLED</td>
+ <td>determine whether the cluster is inside cloud environment and use Helix cloud support</td>
+ </tr>
+ <tr class="a">
+ <td align="left">CLOUD_PROVIDER</td>
+ <td>denote what kind of cloud environment the cluster is in, e.g. Azure, AWS, GCP, or CUSTOMIZED</td>
+ </tr>
+ <tr class="b">
+ <td align="left">CLOUD_ID</td>
+ <td>the specific id in cloud environment that belongs to this cluster</td>
+ </tr>
+ <tr class="a">
+ <td align="left">CLOUD_INFO_SOURCE</td>
+ <td>the source for retrieving the cloud information.</td>
+ </tr>
+ <tr class="b">
+ <td align="left">CLOUD_INFO_PROCESSOR_NAME</td>
+ <td>the name of the function that processes the fetching and parsing of cloud information</td>
+ </tr>
+ </tbody>
+ </table>
+ <p>Users could use either REST API or Java API to set these configs.</p>
+ <section>
+ <h5 id="REST_API_Examples">REST API Examples</h5>
+ <p>Helix enhanced current cluster creation REST API as well as Java API with extra fields that represent cloud related input. For example, in the following modified <code>createCluster</code> API, <code>addCloudConfig</code> is a Boolean value denotes whether to create with cloud config, and the <code>cloudConfigManifest</code> is the cloud config string, which will be converted to a Znode record.</p>
+ <div class="source">
+ <pre><code>@PUT
+ @Path("{clusterId}")
+ public Response createCluster(@PathParam("clusterId") String clusterId, @DefaultValue("false") @QueryParam("recreate") String recreate,
+ @DefaultValue("false") @QueryParam("addCloudConfig") String addCloudConfig, String cloudConfigManifest)
+</code></pre>
+ </div>
+ <p>Besides the enhanced cluster creation API, Helix also provides a set of cloud specific APIs in Java and REST that handles the get/add/update of cloud config.</p>
+ <ul>
+ <li>Create cluster and add meanwhile cloud config related information to ZK.</li>
+ </ul>
+ <div class="source">
+ <pre><code>$ curl -X PUT -H "Content-Type: application/json" http://localhost:1234/admin/v2/clusters/myCluster?addCloudConfig=true -d '
+{
+ "simpleFields" :
+ {
+ "CLOUD_ENABLED" : "true",
+ "CLOUD_PROVIDER": "AWS",
+ "CLOUD_ID" : "12345"
+ "CLOUD_INFO_SOURCE": {"http://169.254.169.254/"}
+ "CLOUD_INFO_PROCESSOR_NAME": "AWSCloudInformationProcesser"
+ }
+}'
+</code></pre>
+ </div>
+ <ul>
+ <li>Add cloud config to an existing cluster</li>
+ </ul>
+ <div class="source">
+ <pre><code>$ curl -X PUT -H "Content-Type: application/json" http://localhost:1234/admin/v2/clusters/myCluster/cloudconfig -d '
+{
+ "simpleFields" :
+ {
+ "CLOUD_ENABLED" : "true",
+ "CLOUD_PROVIDER": "AWS",
+ "CLOUD_ID" : "12345"
+ "CLOUD_INFO_SOURCE": {"http://169.254.169.254/"}
+ "CLOUD_INFO_PROCESSOR_NAME": "AWSCloudInformationProcesser"
+ }
+}'
+</code></pre>
+ </div>
+ <ul>
+ <li>Delete the cloud config of a cluster</li>
+ </ul>
+ <div class="source">
+ <pre><code>$ curl -X DELETE http://localhost:1234/admin/v2/clusters/myCluster/cloudconfig
+</code></pre>
+ </div>
+ <ul>
+ <li>Get the cloud config of a cluster</li>
+ </ul>
+ <div class="source">
+ <pre><code>$ curl -X GET http://localhost:1234/admin/v2/clusters/myCluster/cloudconfig
+</code></pre>
+ </div>
+ <ul>
+ <li>Update the cloud config of a cluster</li>
+ </ul>
+ <div class="source">
+ <pre><code>$ curl -X POST -H "Content-Type: application/json" http://localhost:1234/admin/v2/clusters/myCluster/cloudconfig?command=update -d '
+{
+ "simpleFields" : {
+ "CLOUD_ID" : "12345"
+ }
+}'
+</code></pre>
+ </div>
+ <ul>
+ <li>Delete some of the fields in the cloud config</li>
+ </ul>
+ <div class="source">
+ <pre><code>$ curl -X POST -H "Content-Type: application/json" http://localhost:1234/admin/v2/clusters/myCluster/cloudconfig?command=delete -d '
+{
+ "simpleFields" : {
+ "CLOUD_ID" : "12345"
+ }
+}'
+</code></pre>
+ </div>
+ </section>
+ </section>
+ <section>
+ <h4 id="Define_Cloud_Configs_at_Participant_Level">Define Cloud Configs at Participant Level</h4>
+ <p>At participant level, Helix allows users to provide detailed cloud properties, which is more related to the participantâs actions. For default value, Helix provides <a class="externalLink" href="https://github.com/apache/helix/blob/master/helix-core/src/main/resources/azure-cloud.properties">Azure cloud properties</a>, including not only the default cluster level config values for Azure, like <code>CLOUD_INFO_SOURCE</code> and <code>CLOUD_INFO_PROCESSOR_NAME</code>, but also some participant specific values, such as http timeout when querying AIMS (Azure Instance Metadata Service) in Azure, max retry times, etc.</p>
+ <div class="source">
+ <pre><code>cloud_info_source=http://169.254.169.254/metadata/instance?api-version=2019-06-04
+cloud_info_processor_name=AzureCloudInstanceInformationProcessor
+cloud_max_retry=5
+connection_timeout_ms=5000
+request_timeout_ms=5000
+</code></pre>
+ </div>
+ <p>If users would like to use their customized config for participants, they can input the specific properties through <a class="externalLink" href="https://github.com/apache/helix/blob/master/helix-core/src/main/java/org/apache/helix/HelixManagerProperty.java">Helix Manager Property</a> when composing <a class="externalLink" href="https://github.com/apache/helix/blob/master/helix-core/src/main/java/org/apache/helix/manager/zk/ZKHelixManager.java">Zk Helix Manager</a>, which is passed into participants. <a class="externalLink" href="https://github.com/apache/helix/blob/master/helix-core/src/main/java/org/apache/helix/HelixManagerProperty.java">Helix Manager Property</a> includes <a class="externalLink" href="https://github.com/apache/helix/blob/master/helix-core/src/main/java/org/apache/helix/HelixCloudProperty.java">Helix Cloud Property</a> which includes commonly used cloud properties and also any kind of user defined cloud properties.</p>
+ <div class="source">
+ <pre><code>public ZKHelixManager(String clusterName, String instanceName, InstanceType instanceType,
+ String zkAddress, HelixManagerStateListener stateListener, HelixManagerProperty helixManagerProperty)
+</code></pre>
+ </div>
+ </section>
+ <section>
+ <h4 id="Implement_Cloud_Instance_Information_.28if_necessary.29">Implement Cloud Instance Information (if necessary)</h4>
+ <p>Helix has predefined a few fields in the interface of <a class="externalLink" href="https://github.com/apache/helix/blob/master/helix-core/src/main/java/org/apache/helix/api/cloud/CloudInstanceInformation.java">CloudInstanceInformation</a> that are commonly used in participant. Users are free to define other fields in the instance metadata that they think are useful.</p>
+ <div class="source">
+ <pre><code>public interface CloudInstanceInformation {
+ /**
+ * Get the the value of a specific cloud instance field by name
+ * @return the value of the field
+ */
+ String get(String key);
+
+ /**
+ * The enum contains all the required cloud instance field in Helix
+ */
+ enum CloudInstanceField {
+ INSTANCE_NAME,
+ FAULT_DOMAIN,
+ INSTANCE_SET_NAME
+ }
+}
+</code></pre>
+ </div>
+ </section>
+ <section>
+ <h4 id="Implement_Cloud_Instance_Information_Processor_.28if_necessary.29">Implement Cloud Instance Information Processor (if necessary)</h4>
+ <p>Helix provides an interface to fetch and parse cloud instance information as follows. Helix makes the interface generic enough so that users may implement their own fetching and parsing logic with maximum freedom.</p>
+ <div class="source">
+ <pre><code>/**
+ * Generic interface to fetch and parse cloud instance information
+ */
+public interface CloudInstanceInformationProcessor<T extends Object> {
+
+ /**
+ * Get the raw cloud instance information
+ * @return raw cloud instance information
+ */
+ List<T> fetchCloudInstanceInformation();
+
+ /**
+ * Parse the raw cloud instance information in responses and compose required cloud instance information
+ * @return required cloud instance information
+ */
+ CloudInstanceInformation parseCloudInstanceInformation(List<T> responses);
+}
+</code></pre>
+ </div>
+ <p>Helix also implements an example processor for Azure in <a class="externalLink" href="https://github.com/apache/helix/blob/master/helix-core/src/main/java/org/apache/helix/cloud/azure/AzureCloudInstanceInformationProcessor.java">AzureCloudInstanceInformationProcessor</a>. The implementation includes fetching and parsing Azure cloud instance information. The fetching function retrieves instance information from Azure AIMS, and the parsing function validates the response, and selects the fields needed for participant auto registration. If users would like to use Helix in an Azure environment, they do not need to implement it by themselves.</p>
+ <p>If users need to use Helix in another cloud environment, they can implement their own information processor. The implementation would be similar to Azure implementation, and the main difference would be in how to parse the response and retrieve interested fields.</p>
+ </section>
+ <section>
+ <h4 id="Config_Properly_for_Participant_Auto_Registration_to_Work">Config Properly for Participant Auto Registration to Work</h4>
+ <p>To make the participant auto registration work, users would need to make sure their cluster config is set properly. The most important one is the <code>allowParticipantAutoJoin</code> field in cluster config.</p>
+ <div class="source">
+ <pre><code>{
+ "id": "clusterName",
+ "listFields": {},
+ "mapFields": {},
+ "simpleFields": {
+ ......
+ "allowParticipantAutoJoin": "true"
+ ......
+ }
+}
+</code></pre>
+ </div>
+ <p>This field is used in participant manager logic as a prerequisite for participants to do auto registration. The detailed logic is shown in the following flow chart. The related code is in <a class="externalLink" href="https://github.com/apache/helix/blob/master/helix-core/src/main/java/org/apache/helix/manager/zk/ParticipantManager.java">Participant Manager</a>.</p>
+ <p><img src="./images/ParticipantAutoRegistrationLogic.png" alt="Participant Auto Registration Logic"></p>
+ <p>If the participant decides that it should do auto registration based on the config, it will first query cloud config and decide what environment it is in. Based on this information, the participant will call the corresponding cloud instance information processor. Then with all the information, especially the domain information, the participant can auto register to the cluster without any manual effort.</p>
+ </section>
+ </section>
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