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Posted to commits@helix.apache.org by jx...@apache.org on 2022/05/12 05:29:06 UTC
svn commit: r1900823 [6/22] - in /helix/site-content: ./ 0.9.9-docs/ 0.9.9-docs/css/ 0.9.9-docs/images/ 0.9.9-docs/js/ 0.9.9-docs/recipes/ 0.9.9-docs/releasenotes/ 1.0.2-docs/ 1.0.2-docs/css/ 1.0.2-docs/images/ 1.0.2-docs/js/ 1.0.2-docs/recipes/ 1.0.2-...
Added: helix/site-content/1.0.5-docs/Metrics.html
URL: http://svn.apache.org/viewvc/helix/site-content/1.0.5-docs/Metrics.html?rev=1900823&view=auto
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+ <a href="http://helix.apache.org/" id="bannerLeft"><img src="../images/helix-logo.jpg" 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>Helix Monitoring Metrics</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
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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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+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_Monitoring_Metrics">Helix Monitoring Metrics</h2>
+ </div>
+ <p>Helix monitoring metrics are exposed as the MBeans attributes. The MBeans are registered based on instance role.</p>
+ <p>The easiest way to see the available metrics is using jconsole and point it at a running Helix instance. This will allow browsing all metrics with JMX.</p>
+ <p>Note that if not mentioned in the attribute name, all attributes are gauge by default.</p>
+ <section>
+ <h3 id="Metrics_on_Both_Controller_and_Participant">Metrics on Both Controller and Participant</h3>
+ <section>
+ <h4 id="MBean_ZkClientMonitor">MBean ZkClientMonitor</h4>
+ <p>ObjectName: âHelixZkClient:type=[client-type],key=[specified-client-key],PATH=[zk-client-listening-path]â</p>
+ <table border="0" class="bodyTable table table-striped table-hover">
+ <thead>
+ <tr class="a">
+ <th>Attributes</th>
+ <th>Description</th>
+ </tr>
+ </thead>
+ <tbody>
+ <tr class="b">
+ <td align="left">ReadCounter</td>
+ <td>Zk Read counter. Which could be used to identify unusually high/low ZK traffic</td>
+ </tr>
+ <tr class="a">
+ <td align="left">WriteCounter</td>
+ <td>Same as above</td>
+ </tr>
+ <tr class="b">
+ <td align="left">ReadBytesCounter</td>
+ <td>Same as above</td>
+ </tr>
+ <tr class="a">
+ <td align="left">WriteBytesCounter</td>
+ <td>Same as above</td>
+ </tr>
+ <tr class="b">
+ <td align="left">StateChangeEventCounter</td>
+ <td>Zk connection state change counter. Which could be used to identify ZkClient unstable connection</td>
+ </tr>
+ <tr class="a">
+ <td align="left">DataChangeEventCounter</td>
+ <td>Zk node data change counter. which could be used to identify unusual high/low ZK events occurrence or slow event processing</td>
+ </tr>
+ <tr class="b">
+ <td align="left">PendingCallbackGauge</td>
+ <td>Number of the pending Zk callbacks.</td>
+ </tr>
+ <tr class="a">
+ <td align="left">TotalCallbackCounter</td>
+ <td>Number of total received Zk callbacks.</td>
+ </tr>
+ <tr class="b">
+ <td align="left">TotalCallbackHandledCounter</td>
+ <td>Number of total handled Zk callbacks.</td>
+ </tr>
+ <tr class="a">
+ <td align="left">ReadTotalLatencyCounter</td>
+ <td>Total read latency in ms.</td>
+ </tr>
+ <tr class="b">
+ <td align="left">WriteTotalLatencyCounter</td>
+ <td>Total write latency in ms.</td>
+ </tr>
+ <tr class="a">
+ <td align="left">WriteFailureCounter</td>
+ <td>Total write failures.</td>
+ </tr>
+ <tr class="b">
+ <td align="left">ReadFailureCounter</td>
+ <td>Total read failures.</td>
+ </tr>
+ <tr class="a">
+ <td align="left">ReadLatencyGauge</td>
+ <td>Histogram (with all statistic data) of read latency.</td>
+ </tr>
+ <tr class="b">
+ <td align="left">WriteLatencyGauge</td>
+ <td>Histogram (with all statistic data) of write latency.</td>
+ </tr>
+ <tr class="a">
+ <td align="left">ReadBytesGauge</td>
+ <td>Histogram (with all statistic data) of read bytes of single Zk access.</td>
+ </tr>
+ <tr class="b">
+ <td align="left">WriteBytesGauge</td>
+ <td>Histogram (with all statistic data) of write bytes of single Zk access.</td>
+ </tr>
+ </tbody>
+ </table>
+ </section>
+ <section>
+ <h4 id="MBean_HelixCallbackMonitor">MBean HelixCallbackMonitor</h4>
+ <p>ObjectName: âHelixCallback:Type=[callback-type],Key=[cluster-name].[instance-name],Change=[callback-change-type]â</p>
+ <table border="0" class="bodyTable table table-striped table-hover">
+ <thead>
+ <tr class="a">
+ <th>Attributes</th>
+ <th>Description</th>
+ </tr>
+ </thead>
+ <tbody>
+ <tr class="b">
+ <td align="left">Counter</td>
+ <td>Zk Callback counter for each Helix callback type.</td>
+ </tr>
+ <tr class="a">
+ <td align="left">UnbatchedCounter</td>
+ <td>Unbatched Zk Callback counter for each helix callback type.</td>
+ </tr>
+ <tr class="b">
+ <td align="left">LatencyCounter</td>
+ <td>Callback handler latency counter in ms.</td>
+ </tr>
+ <tr class="a">
+ <td align="left">LatencyGauge</td>
+ <td>Histogram (with all statistic data) of Callback handler latency.</td>
+ </tr>
+ </tbody>
+ </table>
+ </section>
+ <section>
+ <h4 id="MBean_MessageQueueMonitor">MBean MessageQueueMonitor</h4>
+ <p>ObjectName: âClusterStatus:cluster=[cluster-name],messageQueue=[instance-name]â</p>
+ <table border="0" class="bodyTable table table-striped table-hover">
+ <thead>
+ <tr class="a">
+ <th>Attributes</th>
+ <th>Description</th>
+ </tr>
+ </thead>
+ <tbody>
+ <tr class="b">
+ <td align="left">MessageQueueBacklog</td>
+ <td>Get the message queue size</td>
+ </tr>
+ </tbody>
+ </table>
+ </section>
+ </section>
+ <section>
+ <h3 id="Metrics_on_Controller_only">Metrics on Controller only</h3>
+ <section>
+ <h4 id="MBean_ClusterStatusMonitor">MBean ClusterStatusMonitor</h4>
+ <p>ObjectName: âClusterStatus:cluster=[cluster-name]â</p>
+ <table border="0" class="bodyTable table table-striped table-hover">
+ <thead>
+ <tr class="a">
+ <th>Attributes</th>
+ <th>Description</th>
+ </tr>
+ </thead>
+ <tbody>
+ <tr class="b">
+ <td align="left">DisabledInstancesGauge</td>
+ <td>Current number of disabled instances</td>
+ </tr>
+ <tr class="a">
+ <td align="left">DisabledPartitionsGauge</td>
+ <td>Current number of disabled partitions number</td>
+ </tr>
+ <tr class="b">
+ <td align="left">DownInstanceGauge</td>
+ <td>Current down instances number</td>
+ </tr>
+ <tr class="a">
+ <td align="left">InstanceMessageQueueBacklog</td>
+ <td>The sum of all message queue sizes for instances in this cluster</td>
+ </tr>
+ <tr class="b">
+ <td align="left">InstancesGauge</td>
+ <td>Current live instances number</td>
+ </tr>
+ <tr class="a">
+ <td align="left">MaxMessageQueueSizeGauge</td>
+ <td>The maximum message queue size across all instances including controller</td>
+ </tr>
+ <tr class="b">
+ <td align="left">RebalanceFailureGauge</td>
+ <td>None 0 if previous rebalance failed unexpectedly. The Gauge will be set every time rebalance is done.</td>
+ </tr>
+ <tr class="a">
+ <td align="left">RebalanceFailureCounter</td>
+ <td>The number of failures during rebalance pipeline.</td>
+ </tr>
+ <tr class="b">
+ <td align="left">Enabled</td>
+ <td>1 if cluster is enabled, otherwise 0</td>
+ </tr>
+ <tr class="a">
+ <td align="left">Maintenance</td>
+ <td>1 if cluster is in maintenance mode, otherwise 0</td>
+ </tr>
+ <tr class="b">
+ <td align="left">Paused</td>
+ <td>1 if cluster is paused, otherwise 0</td>
+ </tr>
+ </tbody>
+ </table>
+ </section>
+ <section>
+ <h4 id="MBean_ClusterEventMonitor">MBean ClusterEventMonitor</h4>
+ <p>ObjectName: âClusterStatus:cluster=[cluster-name],eventName=ClusterEvent,phaseName=[event-handling-phase]â</p>
+ <table border="0" class="bodyTable table table-striped table-hover">
+ <thead>
+ <tr class="a">
+ <th>Attributes</th>
+ <th>Description</th>
+ </tr>
+ </thead>
+ <tbody>
+ <tr class="b">
+ <td align="left">TotalDurationCounter</td>
+ <td>Total event process duration for each stage.</td>
+ </tr>
+ <tr class="a">
+ <td align="left">MaxSingleDurationGauge</td>
+ <td>Max event process duration for each stage within the recent hour.</td>
+ </tr>
+ <tr class="b">
+ <td align="left">EventCounter</td>
+ <td>The count of processed event in each stage.</td>
+ </tr>
+ <tr class="a">
+ <td align="left">DurationGauge</td>
+ <td>Histogram (with all statistic data) of event process duration for each stage.</td>
+ </tr>
+ </tbody>
+ </table>
+ </section>
+ <section>
+ <h4 id="MBean_InstanceMonitor">MBean InstanceMonitor</h4>
+ <p>ObjectName: âClusterStatus:cluster=[cluster-name],instanceName=[instance-name]â</p>
+ <table border="0" class="bodyTable table table-striped table-hover">
+ <thead>
+ <tr class="a">
+ <th>Attributes</th>
+ <th>Description</th>
+ </tr>
+ </thead>
+ <tbody>
+ <tr class="b">
+ <td align="left">Online</td>
+ <td>This instance is Online (1) or Offline (0)</td>
+ </tr>
+ <tr class="a">
+ <td align="left">Enabled</td>
+ <td>This instance is Enabled (1) or Disabled (0)</td>
+ </tr>
+ <tr class="b">
+ <td align="left">TotalMessageReceived</td>
+ <td>Number of messages sent to this instance by controller</td>
+ </tr>
+ <tr class="a">
+ <td align="left">DisabledPartitions</td>
+ <td>Get the total disabled partitions number for this instance</td>
+ </tr>
+ </tbody>
+ </table>
+ </section>
+ <section>
+ <h4 id="MBean_ResourceMonitor">MBean ResourceMonitor</h4>
+ <p>ObjectName: âClusterStatus:cluster=[cluster-name],resourceName=[resource-name]â</p>
+ <table border="0" class="bodyTable table table-striped table-hover">
+ <thead>
+ <tr class="a">
+ <th>Attributes</th>
+ <th>Description</th>
+ </tr>
+ </thead>
+ <tbody>
+ <tr class="b">
+ <td align="left">PartitionGauge</td>
+ <td>Get number of partitions of the resource in best possible ideal state for this resource</td>
+ </tr>
+ <tr class="a">
+ <td align="left">ErrorPartitionGauge</td>
+ <td>Get the number of current partitions in ERORR state for this resource</td>
+ </tr>
+ <tr class="b">
+ <td align="left">DifferenceWithIdealStateGauge</td>
+ <td>Get the number of how many replicas' current state are different from ideal state for this resource</td>
+ </tr>
+ <tr class="a">
+ <td align="left">MissingTopStatePartitionGauge</td>
+ <td>Get the number of partitions do not have top state for this resource</td>
+ </tr>
+ <tr class="b">
+ <td align="left">ExternalViewPartitionGauge</td>
+ <td>Get number of partitions in ExternalView for this resource</td>
+ </tr>
+ <tr class="a">
+ <td align="left">TotalMessageReceived</td>
+ <td>Get number of messages sent to this resource by controller</td>
+ </tr>
+ <tr class="b">
+ <td align="left">LoadRebalanceThrottledPartitionGauge</td>
+ <td>Get number of partitions that need load rebalance but were throttled.</td>
+ </tr>
+ <tr class="a">
+ <td align="left">RecoveryRebalanceThrottledPartitionGauge</td>
+ <td>Get number of partitions that need recovery rebalance but were throttled.</td>
+ </tr>
+ <tr class="b">
+ <td align="left">PendingLoadRebalancePartitionGauge</td>
+ <td>Get number of partitions that have pending load rebalance requests.</td>
+ </tr>
+ <tr class="a">
+ <td align="left">PendingRecoveryRebalancePartitionGauge</td>
+ <td>Get number of partitions that have pending recovery rebalance requests.</td>
+ </tr>
+ <tr class="b">
+ <td align="left">MissingReplicaPartitionGauge</td>
+ <td>Get number of partitions that have replica number smaller than expected.</td>
+ </tr>
+ <tr class="a">
+ <td align="left">MissingMinActiveReplicaPartitionGauge</td>
+ <td>Get number of partitions that have replica number smaller than the minimum requirement.</td>
+ </tr>
+ <tr class="b">
+ <td align="left">MaxSinglePartitionTopStateHandoffDurationGauge</td>
+ <td>Get the max duration recorded when the top state is missing in any single partition.</td>
+ </tr>
+ <tr class="a">
+ <td align="left">FailedTopStateHandoffCounter</td>
+ <td>Get the number of total top state transition failure.</td>
+ </tr>
+ <tr class="b">
+ <td align="left">SucceededTopStateHandoffCounter</td>
+ <td>Get the number of total top state transition done successfully.</td>
+ </tr>
+ <tr class="a">
+ <td align="left">SuccessfulTopStateHandoffDurationCounter</td>
+ <td>Get the total duration of all top state transitions.</td>
+ </tr>
+ <tr class="b">
+ <td align="left">PartitionTopStateHandoffDurationGauge</td>
+ <td>Histogram (with all statistic data) of top state transition duration.</td>
+ </tr>
+ </tbody>
+ </table>
+ </section>
+ <section>
+ <h4 id="MBean_PerInstanceResourceMonitor">MBean PerInstanceResourceMonitor</h4>
+ <p>ObjectName: âClusterStatus:cluster=[cluster-name],instanceName=[instance-name],resourceName=[resource-name]â</p>
+ <table border="0" class="bodyTable table table-striped table-hover">
+ <thead>
+ <tr class="a">
+ <th>Attributes</th>
+ <th>Description</th>
+ </tr>
+ </thead>
+ <tbody>
+ <tr class="b">
+ <td align="left">PartitionGauge</td>
+ <td>Get number of partitions of the resource in best possible ideal state for this resource on specific instance</td>
+ </tr>
+ </tbody>
+ </table>
+ </section>
+ <section>
+ <h4 id="MBean_JobMonitor">MBean JobMonitor</h4>
+ <p>ObjectName: âClusterStatus:cluster=[cluster-name],jobType=[job-type]â</p>
+ <table border="0" class="bodyTable table table-striped table-hover">
+ <thead>
+ <tr class="a">
+ <th>Attributes</th>
+ <th>Description</th>
+ </tr>
+ </thead>
+ <tbody>
+ <tr class="b">
+ <td align="left">SuccessfulJobCount</td>
+ <td>Get number of the succeeded jobs</td>
+ </tr>
+ <tr class="a">
+ <td align="left">FailedJobCount</td>
+ <td>Get number of failed jobs</td>
+ </tr>
+ <tr class="b">
+ <td align="left">AbortedJobCount</td>
+ <td>Get number of the aborted jobs</td>
+ </tr>
+ <tr class="a">
+ <td align="left">ExistingJobGauge</td>
+ <td>Get number of existing jobs registered</td>
+ </tr>
+ <tr class="b">
+ <td align="left">QueuedJobGauge</td>
+ <td>Get numbers of queued jobs, which are not running jobs</td>
+ </tr>
+ <tr class="a">
+ <td align="left">RunningJobGauge</td>
+ <td>Get numbers of running jobs</td>
+ </tr>
+ <tr class="b">
+ <td align="left">MaximumJobLatencyGauge</td>
+ <td>Get maximum latency of jobs running time. It will be cleared every hour</td>
+ </tr>
+ <tr class="a">
+ <td align="left">JobLatencyCount</td>
+ <td>Get total job latency counter.</td>
+ </tr>
+ </tbody>
+ </table>
+ </section>
+ <section>
+ <h4 id="MBean_WorkflowMonitor">MBean WorkflowMonitor</h4>
+ <p>ObjectName: âClusterStatus:cluster=[cluster-name],workflowType=[workflow-type]â</p>
+ <table border="0" class="bodyTable table table-striped table-hover">
+ <thead>
+ <tr class="a">
+ <th>Attributes</th>
+ <th>Description</th>
+ </tr>
+ </thead>
+ <tbody>
+ <tr class="b">
+ <td align="left">SuccessfulWorkflowCount</td>
+ <td>Get number of succeeded workflows</td>
+ </tr>
+ <tr class="a">
+ <td align="left">FailedWorkflowCount</td>
+ <td>Get number of failed workflows</td>
+ </tr>
+ <tr class="b">
+ <td align="left">FailedWorkflowGauge</td>
+ <td>Get number of current failed workflows</td>
+ </tr>
+ <tr class="a">
+ <td align="left">ExistingWorkflowGauge</td>
+ <td>Get number of current existing workflows</td>
+ </tr>
+ <tr class="b">
+ <td align="left">QueuedWorkflowGauge</td>
+ <td>Get number of queued but not started workflows</td>
+ </tr>
+ <tr class="a">
+ <td align="left">RunningWorkflowGauge</td>
+ <td>Get number of running workflows</td>
+ </tr>
+ <tr class="b">
+ <td align="left">WorkflowLatencyCount</td>
+ <td>Get workflow latency count</td>
+ </tr>
+ <tr class="a">
+ <td align="left">MaximumWorkflowLatencyGauge</td>
+ <td>Get maximum workflow latency gauge. It will be reset in 1 hour.</td>
+ </tr>
+ </tbody>
+ </table>
+ </section>
+ </section>
+ <section>
+ <h3 id="Metrics_on_Participant_only">Metrics on Participant only</h3>
+ <section>
+ <h4 id="MBean_StateTransitionStatMonitor">MBean StateTransitionStatMonitor</h4>
+ <p>ObjectName: âCLMParticipantReport:Cluster=[cluster-name],Resource=[resource-name],Transition=[transaction-id]â</p>
+ <table border="0" class="bodyTable table table-striped table-hover">
+ <thead>
+ <tr class="a">
+ <th>Attributes</th>
+ <th>Description</th>
+ </tr>
+ </thead>
+ <tbody>
+ <tr class="b">
+ <td align="left">TotalStateTransitionGauge</td>
+ <td>Get the number of total state transitions</td>
+ </tr>
+ <tr class="a">
+ <td align="left">TotalFailedTransitionGauge</td>
+ <td>Get the number of total failed state transitions</td>
+ </tr>
+ <tr class="b">
+ <td align="left">TotalSuccessTransitionGauge</td>
+ <td>Get the number of total succeeded state transitions</td>
+ </tr>
+ <tr class="a">
+ <td align="left">MeanTransitionLatency</td>
+ <td>Get the average state transition latency (from message read to finish)</td>
+ </tr>
+ <tr class="b">
+ <td align="left">MaxTransitionLatency</td>
+ <td>Get the maximum state transition latency</td>
+ </tr>
+ <tr class="a">
+ <td align="left">MinTransitionLatency</td>
+ <td>Get the minimum state transition latency</td>
+ </tr>
+ <tr class="b">
+ <td align="left">PercentileTransitionLatency</td>
+ <td>Get the percentile of state transitions latency</td>
+ </tr>
+ <tr class="a">
+ <td align="left">MeanTransitionExecuteLatency</td>
+ <td>Get the average execution latency of state transition (from task started to finish)</td>
+ </tr>
+ <tr class="b">
+ <td align="left">MaxTransitionExecuteLatency</td>
+ <td>Get the maximum execution latency of state transition</td>
+ </tr>
+ <tr class="a">
+ <td align="left">MinTransitionExecuteLatency</td>
+ <td>Get the minimum execution latency of state transition</td>
+ </tr>
+ <tr class="b">
+ <td align="left">PercentileTransitionExecuteLatency</td>
+ <td>Get the percentile of execution latency of state transitions</td>
+ </tr>
+ </tbody>
+ </table>
+ </section>
+ <section>
+ <h4 id="MBean_ThreadPoolExecutorMonitor">MBean ThreadPoolExecutorMonitor</h4>
+ <p>ObjectName: âHelixThreadPoolExecutor:Type=[threadpool-type]â (threadpool-type in Message.MessageType, BatchMessageExecutor, Task)</p>
+ <table border="0" class="bodyTable table table-striped table-hover">
+ <thead>
+ <tr class="a">
+ <th>Attributes</th>
+ <th>Description</th>
+ </tr>
+ </thead>
+ <tbody>
+ <tr class="b">
+ <td align="left">ThreadPoolCoreSizeGauge</td>
+ <td>Thread pool size is as configured. Aggregate total thread pool size for the whole cluster.</td>
+ </tr>
+ <tr class="a">
+ <td align="left">ThreadPoolMaxSizeGauge</td>
+ <td>Same as above</td>
+ </tr>
+ <tr class="b">
+ <td align="left">NumOfActiveThreadsGauge</td>
+ <td>Number of running threads.</td>
+ </tr>
+ <tr class="a">
+ <td align="left">QueueSizeGauge</td>
+ <td>Queue size. Could be used to identify if too many HelixTask blocked in participant.</td>
+ </tr>
+ </tbody>
+ </table>
+ </section>
+ <section>
+ <h4 id="MBean_MessageLatencyMonitor">MBean MessageLatencyMonitor</h4>
+ <p>ObjectName: âCLMParticipantReport:ParticipantName=[instance-name],MonitorType=MessageLatencyMonitorâ</p>
+ <table border="0" class="bodyTable table table-striped table-hover">
+ <thead>
+ <tr class="a">
+ <th>Attributes</th>
+ <th>Description</th>
+ </tr>
+ </thead>
+ <tbody>
+ <tr class="b">
+ <td align="left">TotalMessageCount</td>
+ <td>Total message count</td>
+ </tr>
+ <tr class="a">
+ <td align="left">TotalMessageLatency</td>
+ <td>Total message latency in ms</td>
+ </tr>
+ <tr class="b">
+ <td align="left">MessagelatencyGauge</td>
+ <td>Histogram (with all statistic data) of message processing latency.</td>
+ </tr>
+ </tbody>
+ </table>
+ </section>
+ <section>
+ <h4 id="MBean_ParticipantMessageMonitor">MBean ParticipantMessageMonitor</h4>
+ <p>ObjectName: âCLMParticipantReport:ParticipantName=[instance-name]â</p>
+ <table border="0" class="bodyTable table table-striped table-hover">
+ <thead>
+ <tr class="a">
+ <th>Attributes</th>
+ <th>Description</th>
+ </tr>
+ </thead>
+ <tbody>
+ <tr class="b">
+ <td align="left">ReceivedMessages</td>
+ <td>Number of received messages</td>
+ </tr>
+ <tr class="a">
+ <td align="left">DiscardedMessages</td>
+ <td>Number of discarded messages</td>
+ </tr>
+ <tr class="b">
+ <td align="left">CompletedMessages</td>
+ <td>Number of completed messages</td>
+ </tr>
+ <tr class="a">
+ <td align="left">FailedMessages</td>
+ <td>Number of failed messages</td>
+ </tr>
+ <tr class="b">
+ <td align="left">PendingMessages</td>
+ <td>Number of pending messages to be processed</td>
+ </tr>
+ </tbody>
+ </table>
+ </section>
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--- helix/site-content/1.0.5-docs/Quickstart.html (added)
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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>
+ </div>
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+ <li class="divider">/</li>
+ <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>Quickstart</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
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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
+
+ 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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+specific language governing permissions and limitations
+under the License.
+-->
+<section>
+ <div class="page-header">
+ <h2 id="Quickstart">Quickstart</h2>
+ </div>
+</section>
+<section>
+ <h2 id="Get_Helix">Get Helix</h2>
+ <p>First, let's get Helix. Either build it, or download it.</p>
+ <section>
+ <h3 id="Build">Build</h3>
+ <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
+mvn install package -DskipTests
+cd helix-core/target/helix-core-pkg/bin # This folder contains all the scripts used in following sections
+chmod +x *
+</code></pre>
+ </div>
+ </section>
+ <section>
+ <h3 id="Download">Download</h3>
+ <p>Download the 1.0.4 release package <a href="./download.html">here</a></p>
+ </section>
+</section>
+<section>
+ <h2 id="Overview">Overview</h2>
+ <p>In this Quickstart, we'll set up a leader-standby replicated, partitioned system. Then we'll demonstrate how to add a node, rebalance the partitions, and show how Helix manages failover.</p>
+</section>
+<section>
+ <h2 id="Let.27s_Do_It">Let's Do It</h2>
+ <p>Helix provides command line interfaces to set up the cluster and view the cluster state. The best way to understand how Helix views a cluster is to build a cluster.</p>
+ <section>
+ <h3 id="Get_to_the_Tools_Directory">Get to the Tools Directory</h3>
+ <p>If you built the code:</p>
+ <div class="source">
+ <pre><code>cd helix/helix/helix-core/target/helix-core-pkg/bin
+</code></pre>
+ </div>
+ <p>If you downloaded the release package, extract it.</p>
+ </section>
+</section>
+<section>
+ <h2 id="Short_Version">Short Version</h2>
+ <p>You can observe the components working together in this demo, which does the following:</p>
+ <ul>
+ <li>Create a cluster</li>
+ <li>Add 2 nodes (participants) to the cluster</li>
+ <li>Set up a resource with 6 partitions and 2 replicas: 1 Leader, and 1 Standby per partition</li>
+ <li>Show the cluster state after Helix balances the partitions</li>
+ <li>Add a third node</li>
+ <li>Show the cluster state. Note that the third node has taken leadership of 2 partitions.</li>
+ <li>Kill the third node (Helix takes care of failover)</li>
+ <li>Show the cluster state. Note that the two surviving nodes take over leadership of the partitions from the failed node</li>
+ </ul>
+ <section>
+ <h3 id="Run_the_Demo">Run the Demo</h3>
+ <div class="source">
+ <pre><code>cd helix/helix/helix-core/target/helix-core-pkg/bin
+./quickstart.sh
+</code></pre>
+ </div>
+ <section>
+ <h4 id="The_Initial_Setup">The Initial Setup</h4>
+ <p>2 nodes are set up and the partitions are rebalanced.</p>
+ <p>The cluster state is as follows:</p>
+ <div class="source">
+ <pre><code>CLUSTER STATE: After starting 2 nodes
+ localhost_12000 localhost_12001
+MyResource_0 L S
+MyResource_1 S L
+MyResource_2 L S
+MyResource_3 L S
+MyResource_4 S L
+MyResource_5 S L
+</code></pre>
+ </div>
+ <p>Note there is one leader and one standby per partition.</p>
+ </section>
+ <section>
+ <h4 id="Add_a_Node">Add a Node</h4>
+ <p>A third node is added and the cluster is rebalanced.</p>
+ <p>The cluster state changes to:</p>
+ <div class="source">
+ <pre><code>CLUSTER STATE: After adding a third node
+ localhost_12000 localhost_12001 localhost_12002
+MyResource_0 S L S
+MyResource_1 S S L
+MyResource_2 L S S
+MyResource_3 S S L
+MyResource_4 L S S
+MyResource_5 S L S
+</code></pre>
+ </div>
+ <p>Note there is one leader and <i>two</i> standbys per partition. This is expected because there are three nodes.</p>
+ </section>
+ <section>
+ <h4 id="Kill_a_Node">Kill a Node</h4>
+ <p>Finally, a node is killed to simulate a failure</p>
+ <p>Helix makes sure each partition has a leader. The cluster state changes to:</p>
+ <div class="source">
+ <pre><code>CLUSTER STATE: After the 3rd node stops/crashes
+ localhost_12000 localhost_12001 localhost_12002
+MyResource_0 S L -
+MyResource_1 S L -
+MyResource_2 L S -
+MyResource_3 L S -
+MyResource_4 L S -
+MyResource_5 S L -
+</code></pre>
+ </div>
+ </section>
+ </section>
+</section>
+<section>
+ <h2 id="Long_Version">Long Version</h2>
+ <p>Now you can run the same steps by hand. In this detailed version, we'll do the following:</p>
+ <ul>
+ <li>Define a cluster</li>
+ <li>Add two nodes to the cluster</li>
+ <li>Add a 6-partition resource with 1 leader and 2 standby replicas per partition</li>
+ <li>Verify that the cluster is healthy and inspect the Helix view</li>
+ <li>Expand the cluster: add a few nodes and rebalance the partitions</li>
+ <li>Failover: stop a node and verify the leadership transfer</li>
+ </ul>
+ <section>
+ <h3 id="Install_and_Start_ZooKeeper">Install and Start ZooKeeper</h3>
+ <p>Zookeeper can be started in standalone mode or replicated mode.</p>
+ <p>More information is available at</p>
+ <ul>
+ <li><a class="externalLink" href="http://zookeeper.apache.org/doc/r3.3.3/zookeeperStarted.html">http://zookeeper.apache.org/doc/r3.3.3/zookeeperStarted.html</a></li>
+ <li><a class="externalLink" href="http://zookeeper.apache.org/doc/trunk/zookeeperAdmin.html#sc_zkMulitServerSetup">http://zookeeper.apache.org/doc/trunk/zookeeperAdmin.html#sc_zkMulitServerSetup</a></li>
+ </ul>
+ <p>In this example, let's start zookeeper in local mode.</p>
+ <section>
+ <h4 id="Start_ZooKeeper_Locally_on_Port_2199">Start ZooKeeper Locally on Port 2199</h4>
+ <div class="source">
+ <pre><code>./start-standalone-zookeeper.sh 2199 &
+</code></pre>
+ </div>
+ </section>
+ </section>
+ <section>
+ <h3 id="Define_the_Cluster">Define the Cluster</h3>
+ <p>The helix-admin tool is used for cluster administration tasks. In the Quickstart, we'll use the command line interface. Helix supports a REST interface as well.</p>
+ <p>zookeeper_address is of the format host:port e.g localhost:2199 for standalone or host1:port,host2:port for multi-node.</p>
+ <p>Next, we'll set up a cluster MYCLUSTER cluster with these attributes:</p>
+ <ul>
+ <li>3 instances running on localhost at ports 12913,12914,12915</li>
+ <li>One database named myDB with 6 partitions</li>
+ <li>Each partition will have 3 replicas with 1 leader, 2 standbys</li>
+ <li>ZooKeeper running locally at localhost:2199</li>
+ </ul>
+ <section>
+ <h4 id="Create_the_Cluster_MYCLUSTER">Create the Cluster MYCLUSTER</h4>
+ <div class="source">
+ <pre><code># ./helix-admin.sh --zkSvr <zk_address> --addCluster <clustername>
+./helix-admin.sh --zkSvr localhost:2199 --addCluster MYCLUSTER
+</code></pre>
+ </div>
+ </section>
+ </section>
+ <section>
+ <h3 id="Add_Nodes_to_the_Cluster">Add Nodes to the Cluster</h3>
+ <p>In this case we'll add three nodes: localhost:12913, localhost:12914, localhost:12915</p>
+ <div class="source">
+ <pre><code># helix-admin.sh --zkSvr <zk_address> --addNode <clustername> <host:port>
+./helix-admin.sh --zkSvr localhost:2199 --addNode MYCLUSTER localhost:12913
+./helix-admin.sh --zkSvr localhost:2199 --addNode MYCLUSTER localhost:12914
+./helix-admin.sh --zkSvr localhost:2199 --addNode MYCLUSTER localhost:12915
+</code></pre>
+ </div>
+ </section>
+ <section>
+ <h3 id="Define_the_Resource_and_Partitioning">Define the Resource and Partitioning</h3>
+ <p>In this example, the resource is a database, partitioned 6 ways. Note that in a production system, it's common to over-partition for better load balancing. Helix has been used in production to manage hundreds of databases each with 10s or 100s of partitions running on 10s of physical nodes.</p>
+ <section>
+ <h4 id="Create_a_Database_with_6_Partitions_using_the_LeaderStandby_State_Model">Create a Database with 6 Partitions using the LeaderStandby State Model</h4>
+ <p>Helix ensures there will be exactly one leader for each partition.</p>
+ <div class="source">
+ <pre><code># helix-admin.sh --zkSvr <zk_address> --addResource <clustername> <resourceName> <numPartitions> <StateModelName>
+./helix-admin.sh --zkSvr localhost:2199 --addResource MYCLUSTER myDB 6 LeaderStandby
+</code></pre>
+ </div>
+ </section>
+ <section>
+ <h4 id="Let_Helix_Assign_Partitions_to_Nodes">Let Helix Assign Partitions to Nodes</h4>
+ <p>This command will distribute the partitions amongst all the nodes in the cluster. In this example, each partition has 3 replicas.</p>
+ <div class="source">
+ <pre><code># helix-admin.sh --zkSvr <zk_address> --rebalance <clustername> <resourceName> <replication factor>
+./helix-admin.sh --zkSvr localhost:2199 --rebalance MYCLUSTER myDB 3
+</code></pre>
+ </div>
+ <p>Now the cluster is defined in ZooKeeper. The nodes (localhost:12913, localhost:12914, localhost:12915) and resource (myDB, with 6 partitions using the LeaderStandby model) are all properly configured. And the <i>IdealState</i> has been calculated, assuming a replication factor of 3.</p>
+ </section>
+ </section>
+ <section>
+ <h3 id="Start_the_Helix_Controller">Start the Helix Controller</h3>
+ <p>Now that the cluster is defined in ZooKeeper, the Helix controller can manage the cluster.</p>
+ <div class="source">
+ <pre><code># Start the cluster manager, which will manage MYCLUSTER
+./run-helix-controller.sh --zkSvr localhost:2199 --cluster MYCLUSTER 2>&1 > /tmp/controller.log &
+</code></pre>
+ </div>
+ </section>
+ <section>
+ <h3 id="Start_up_the_Cluster_to_be_Managed">Start up the Cluster to be Managed</h3>
+ <p>We've started up ZooKeeper, defined the cluster, the resources, the partitioning, and started up the Helix controller. Next, we'll start up the nodes of the system to be managed. Each node is a Participant, which is an instance of the system component to be managed. Helix assigns work to Participants, keeps track of their roles and health, and takes action when a node fails.</p>
+ <div class="source">
+ <pre><code># start up each instance. These are mock implementations that are actively managed by Helix
+./start-helix-participant.sh --zkSvr localhost:2199 --cluster MYCLUSTER --host localhost --port 12913 --stateModelType LeaderStandby 2>&1 > /tmp/participant_12913.log
+./start-helix-participant.sh --zkSvr localhost:2199 --cluster MYCLUSTER --host localhost --port 12914 --stateModelType LeaderStandby 2>&1 > /tmp/participant_12914.log
+./start-helix-participant.sh --zkSvr localhost:2199 --cluster MYCLUSTER --host localhost --port 12915 --stateModelType LeaderStandby 2>&1 > /tmp/participant_12915.log
+</code></pre>
+ </div>
+ </section>
+ <section>
+ <h3 id="Inspect_the_Cluster">Inspect the Cluster</h3>
+ <p>Now, let's see the Helix view of our cluster. We'll work our way down as follows:</p>
+ <div class="source">
+ <pre><code>Clusters -> MYCLUSTER -> instances -> instance detail
+ -> resources -> resource detail
+ -> partitions
+</code></pre>
+ </div>
+ <p>A single Helix controller can manage multiple clusters, though so far, we've only defined one cluster. Let's see:</p>
+ <div class="source">
+ <pre><code># List existing clusters
+./helix-admin.sh --zkSvr localhost:2199 --listClusters
+
+Existing clusters:
+MYCLUSTER
+</code></pre>
+ </div>
+ <p>Now, let's see the Helix view of MYCLUSTER:</p>
+ <div class="source">
+ <pre><code># helix-admin.sh --zkSvr <zk_address> --listClusterInfo <clusterName>
+./helix-admin.sh --zkSvr localhost:2199 --listClusterInfo MYCLUSTER
+
+Existing resources in cluster MYCLUSTER:
+myDB
+Instances in cluster MYCLUSTER:
+localhost_12915
+localhost_12914
+localhost_12913
+</code></pre>
+ </div>
+ <p>Let's look at the details of an instance:</p>
+ <div class="source">
+ <pre><code># ./helix-admin.sh --zkSvr <zk_address> --listInstanceInfo <clusterName> <InstanceName>
+./helix-admin.sh --zkSvr localhost:2199 --listInstanceInfo MYCLUSTER localhost_12913
+
+InstanceConfig: {
+ "id" : "localhost_12913",
+ "mapFields" : {
+ },
+ "listFields" : {
+ },
+ "simpleFields" : {
+ "HELIX_ENABLED" : "true",
+ "HELIX_HOST" : "localhost",
+ "HELIX_PORT" : "12913"
+ }
+}
+</code></pre>
+ </div>
+ <section>
+ <h4 id="Query_Information_about_a_Resource">Query Information about a Resource</h4>
+ <div class="source">
+ <pre><code># helix-admin.sh --zkSvr <zk_address> --listResourceInfo <clusterName> <resourceName>
+./helix-admin.sh --zkSvr localhost:2199 --listResourceInfo MYCLUSTER myDB
+
+IdealState for myDB:
+{
+ "id" : "myDB",
+ "mapFields" : {
+ "myDB_0" : {
+ "localhost_12913" : "STANDBY",
+ "localhost_12914" : "LEADER",
+ "localhost_12915" : "STANDBY"
+ },
+ "myDB_1" : {
+ "localhost_12913" : "STANDBY",
+ "localhost_12914" : "STANDBY",
+ "localhost_12915" : "LEADER"
+ },
+ "myDB_2" : {
+ "localhost_12913" : "LEADER",
+ "localhost_12914" : "STANDBY",
+ "localhost_12915" : "STANDBY"
+ },
+ "myDB_3" : {
+ "localhost_12913" : "STANDBY",
+ "localhost_12914" : "STANDBY",
+ "localhost_12915" : "LEADER"
+ },
+ "myDB_4" : {
+ "localhost_12913" : "LEADER",
+ "localhost_12914" : "STANDBY",
+ "localhost_12915" : "STANDBY"
+ },
+ "myDB_5" : {
+ "localhost_12913" : "STANDBY",
+ "localhost_12914" : "LEADER",
+ "localhost_12915" : "STANDBY"
+ }
+ },
+ "listFields" : {
+ "myDB_0" : [ "localhost_12914", "localhost_12913", "localhost_12915" ],
+ "myDB_1" : [ "localhost_12915", "localhost_12913", "localhost_12914" ],
+ "myDB_2" : [ "localhost_12913", "localhost_12915", "localhost_12914" ],
+ "myDB_3" : [ "localhost_12915", "localhost_12913", "localhost_12914" ],
+ "myDB_4" : [ "localhost_12913", "localhost_12914", "localhost_12915" ],
+ "myDB_5" : [ "localhost_12914", "localhost_12915", "localhost_12913" ]
+ },
+ "simpleFields" : {
+ "IDEAL_STATE_MODE" : "AUTO",
+ "REBALANCE_MODE" : "SEMI_AUTO",
+ "NUM_PARTITIONS" : "6",
+ "REPLICAS" : "3",
+ "STATE_MODEL_DEF_REF" : "LeaderStandby",
+ "STATE_MODEL_FACTORY_NAME" : "DEFAULT"
+ }
+}
+
+ExternalView for myDB:
+{
+ "id" : "myDB",
+ "mapFields" : {
+ "myDB_0" : {
+ "localhost_12913" : "STANDBY",
+ "localhost_12914" : "LEADER",
+ "localhost_12915" : "STANDBY"
+ },
+ "myDB_1" : {
+ "localhost_12913" : "STANDBY",
+ "localhost_12914" : "STANDBY",
+ "localhost_12915" : "LEADER"
+ },
+ "myDB_2" : {
+ "localhost_12913" : "LEADER",
+ "localhost_12914" : "STANDBY",
+ "localhost_12915" : "STANDBY"
+ },
+ "myDB_3" : {
+ "localhost_12913" : "STANDBY",
+ "localhost_12914" : "STANDBY",
+ "localhost_12915" : "LEADER"
+ },
+ "myDB_4" : {
+ "localhost_12913" : "LEADER",
+ "localhost_12914" : "STANDBY",
+ "localhost_12915" : "STANDBY"
+ },
+ "myDB_5" : {
+ "localhost_12913" : "STANDBY",
+ "localhost_12914" : "LEADER",
+ "localhost_12915" : "STANDBY"
+ }
+ },
+ "listFields" : {
+ },
+ "simpleFields" : {
+ "BUCKET_SIZE" : "0"
+ }
+}
+</code></pre>
+ </div>
+ <p>Now, let's look at one of the partitions:</p>
+ <div class="source">
+ <pre><code># helix-admin.sh --zkSvr <zk_address> --listResourceInfo <clusterName> <partition>
+./helix-admin.sh --zkSvr localhost:2199 --listResourceInfo mycluster myDB_0
+</code></pre>
+ </div>
+ </section>
+ </section>
+ <section>
+ <h3 id="Expand_the_Cluster">Expand the Cluster</h3>
+ <p>Next, we'll show how Helix does the work that you'd otherwise have to build into your system. When you add capacity to your cluster, you want the work to be evenly distributed. In this example, we started with 3 nodes, with 6 partitions. The partitions were evenly balanced, 2 leaders and 4 standbys per node. Let's add 3 more nodes: localhost:12916, localhost:12917, localhost:12918</p>
+ <div class="source">
+ <pre><code>./helix-admin.sh --zkSvr localhost:2199 --addNode MYCLUSTER localhost:12916
+./helix-admin.sh --zkSvr localhost:2199 --addNode MYCLUSTER localhost:12917
+./helix-admin.sh --zkSvr localhost:2199 --addNode MYCLUSTER localhost:12918
+</code></pre>
+ </div>
+ <p>And start up these instances:</p>
+ <div class="source">
+ <pre><code># start up each instance. These are mock implementations that are actively managed by Helix
+./start-helix-participant.sh --zkSvr localhost:2199 --cluster MYCLUSTER --host localhost --port 12916 --stateModelType LeaderStandby 2>&1 > /tmp/participant_12916.log
+./start-helix-participant.sh --zkSvr localhost:2199 --cluster MYCLUSTER --host localhost --port 12917 --stateModelType LeaderStandby 2>&1 > /tmp/participant_12917.log
+./start-helix-participant.sh --zkSvr localhost:2199 --cluster MYCLUSTER --host localhost --port 12918 --stateModelType LeaderStandby 2>&1 > /tmp/participant_12918.log
+</code></pre>
+ </div>
+ <p>And now, let Helix do the work for you. To shift the work, simply rebalance. After the rebalance, each node will have one leader and two standbys.</p>
+ <div class="source">
+ <pre><code>./helix-admin.sh --zkSvr localhost:2199 --rebalance MYCLUSTER myDB 3
+</code></pre>
+ </div>
+ </section>
+ <section>
+ <h3 id="View_the_Cluster">View the Cluster</h3>
+ <p>OK, let's see how it looks:</p>
+ <div class="source">
+ <pre><code>./helix-admin.sh --zkSvr localhost:2199 --listResourceInfo MYCLUSTER myDB
+
+IdealState for myDB:
+{
+ "id" : "myDB",
+ "mapFields" : {
+ "myDB_0" : {
+ "localhost_12913" : "STANDBY",
+ "localhost_12914" : "STANDBY",
+ "localhost_12917" : "LEADER"
+ },
+ "myDB_1" : {
+ "localhost_12916" : "STANDBY",
+ "localhost_12917" : "STANDBY",
+ "localhost_12918" : "LEADER"
+ },
+ "myDB_2" : {
+ "localhost_12913" : "LEADER",
+ "localhost_12917" : "STANDBY",
+ "localhost_12918" : "STANDBY"
+ },
+ "myDB_3" : {
+ "localhost_12915" : "LEADER",
+ "localhost_12917" : "STANDBY",
+ "localhost_12918" : "STANDBY"
+ },
+ "myDB_4" : {
+ "localhost_12916" : "LEADER",
+ "localhost_12917" : "STANDBY",
+ "localhost_12918" : "STANDBY"
+ },
+ "myDB_5" : {
+ "localhost_12913" : "STANDBY",
+ "localhost_12914" : "LEADER",
+ "localhost_12915" : "STANDBY"
+ }
+ },
+ "listFields" : {
+ "myDB_0" : [ "localhost_12917", "localhost_12913", "localhost_12914" ],
+ "myDB_1" : [ "localhost_12918", "localhost_12917", "localhost_12916" ],
+ "myDB_2" : [ "localhost_12913", "localhost_12917", "localhost_12918" ],
+ "myDB_3" : [ "localhost_12915", "localhost_12917", "localhost_12918" ],
+ "myDB_4" : [ "localhost_12916", "localhost_12917", "localhost_12918" ],
+ "myDB_5" : [ "localhost_12914", "localhost_12915", "localhost_12913" ]
+ },
+ "simpleFields" : {
+ "IDEAL_STATE_MODE" : "AUTO",
+ "REBALANCE_MODE" : "SEMI_AUTO",
+ "NUM_PARTITIONS" : "6",
+ "REPLICAS" : "3",
+ "STATE_MODEL_DEF_REF" : "LeaderStandby",
+ "STATE_MODEL_FACTORY_NAME" : "DEFAULT"
+ }
+}
+
+ExternalView for myDB:
+{
+ "id" : "myDB",
+ "mapFields" : {
+ "myDB_0" : {
+ "localhost_12913" : "STANDBY",
+ "localhost_12914" : "STANDBY",
+ "localhost_12917" : "LEADER"
+ },
+ "myDB_1" : {
+ "localhost_12916" : "STANDBY",
+ "localhost_12917" : "STANDBY",
+ "localhost_12918" : "LEADER"
+ },
+ "myDB_2" : {
+ "localhost_12913" : "LEADER",
+ "localhost_12917" : "STANDBY",
+ "localhost_12918" : "STANDBY"
+ },
+ "myDB_3" : {
+ "localhost_12915" : "LEADER",
+ "localhost_12917" : "STANDBY",
+ "localhost_12918" : "STANDBY"
+ },
+ "myDB_4" : {
+ "localhost_12916" : "LEADER",
+ "localhost_12917" : "STANDBY",
+ "localhost_12918" : "STANDBY"
+ },
+ "myDB_5" : {
+ "localhost_12913" : "STANDBY",
+ "localhost_12914" : "LEADER",
+ "localhost_12915" : "STANDBY"
+ }
+ },
+ "listFields" : {
+ },
+ "simpleFields" : {
+ "BUCKET_SIZE" : "0"
+ }
+}
+</code></pre>
+ </div>
+ <p>Mission accomplished. The partitions are nicely balanced.</p>
+ </section>
+ <section>
+ <h3 id="How_about_Failover.3F">How about Failover?</h3>
+ <p>Building a fault tolerant system isn't trivial, but with Helix, it's easy. Helix detects a failed instance, and triggers leadership transfer automatically.</p>
+ <p>First, let's fail an instance. In this example, we'll kill localhost:12918 to simulate a failure.</p>
+ <p>We lost localhost:12918, so myDB_1 lost its LEADER. Helix can fix that, it will transfer leadership to a healthy node that is currently a STANDBY, say localhost:12197. Helix balances the load as best as it can, given there are 6 partitions on 5 nodes. Let's see:</p>
+ <div class="source">
+ <pre><code>./helix-admin.sh --zkSvr localhost:2199 --listResourceInfo MYCLUSTER myDB
+
+IdealState for myDB:
+{
+ "id" : "myDB",
+ "mapFields" : {
+ "myDB_0" : {
+ "localhost_12913" : "STANDBY",
+ "localhost_12914" : "STANDBY",
+ "localhost_12917" : "LEADER"
+ },
+ "myDB_1" : {
+ "localhost_12916" : "STANDBY",
+ "localhost_12917" : "STANDBY",
+ "localhost_12918" : "LEADER"
+ },
+ "myDB_2" : {
+ "localhost_12913" : "LEADER",
+ "localhost_12917" : "STANDBY",
+ "localhost_12918" : "STANDBY"
+ },
+ "myDB_3" : {
+ "localhost_12915" : "LEADER",
+ "localhost_12917" : "STANDBY",
+ "localhost_12918" : "STANDBY"
+ },
+ "myDB_4" : {
+ "localhost_12916" : "LEADER",
+ "localhost_12917" : "STANDBY",
+ "localhost_12918" : "STANDBY"
+ },
+ "myDB_5" : {
+ "localhost_12913" : "STANDBY",
+ "localhost_12914" : "LEADER",
+ "localhost_12915" : "STANDBY"
+ }
+ },
+ "listFields" : {
+ "myDB_0" : [ "localhost_12917", "localhost_12913", "localhost_12914" ],
+ "myDB_1" : [ "localhost_12918", "localhost_12917", "localhost_12916" ],
+ "myDB_2" : [ "localhost_12913", "localhost_12918", "localhost_12917" ],
+ "myDB_3" : [ "localhost_12915", "localhost_12918", "localhost_12917" ],
+ "myDB_4" : [ "localhost_12916", "localhost_12917", "localhost_12918" ],
+ "myDB_5" : [ "localhost_12914", "localhost_12915", "localhost_12913" ]
+ },
+ "simpleFields" : {
+ "IDEAL_STATE_MODE" : "AUTO",
+ "REBALANCE_MODE" : "SEMI_AUTO",
+ "NUM_PARTITIONS" : "6",
+ "REPLICAS" : "3",
+ "STATE_MODEL_DEF_REF" : "LeaderStandby",
+ "STATE_MODEL_FACTORY_NAME" : "DEFAULT"
+ }
+}
+
+ExternalView for myDB:
+{
+ "id" : "myDB",
+ "mapFields" : {
+ "myDB_0" : {
+ "localhost_12913" : "STANDBY",
+ "localhost_12914" : "STANDBY",
+ "localhost_12917" : "LEADER"
+ },
+ "myDB_1" : {
+ "localhost_12916" : "STANDBY",
+ "localhost_12917" : "LEADER"
+ },
+ "myDB_2" : {
+ "localhost_12913" : "LEADER",
+ "localhost_12917" : "STANDBY"
+ },
+ "myDB_3" : {
+ "localhost_12915" : "LEADER",
+ "localhost_12917" : "STANDBY"
+ },
+ "myDB_4" : {
+ "localhost_12916" : "LEADER",
+ "localhost_12917" : "STANDBY"
+ },
+ "myDB_5" : {
+ "localhost_12913" : "STANDBY",
+ "localhost_12914" : "LEADER",
+ "localhost_12915" : "STANDBY"
+ }
+ },
+ "listFields" : {
+ },
+ "simpleFields" : {
+ "BUCKET_SIZE" : "0"
+ }
+}
+</code></pre>
+ </div>
+ <p>As we've seen in this Quickstart, Helix takes care of partitioning, load balancing, elasticity, failure detection and recovery.</p>
+ </section>
+ <section>
+ <h3 id="ZooInspector">ZooInspector</h3>
+ <p>You can view all of the underlying data by going direct to zookeeper. Use ZooInspector that comes with zookeeper to browse the data. This is a java applet (make sure you have X windows)</p>
+ <p>To start zooinspector run the following command from <zk_install_directory>/contrib/ZooInspector</p>
+ <div class="source">
+ <pre><code>java -cp zookeeper-3.3.3-ZooInspector.jar:lib/jtoaster-1.0.4.jar:../../lib/log4j-1.2.15.jar:../../zookeeper-3.3.3.jar org.apache.zookeeper.inspector.ZooInspector
+</code></pre>
+ </div>
+ </section>
+ <section>
+ <h3 id="Next">Next</h3>
+ <p>Now that you understand the idea of Helix, read the <a href="./Tutorial.html">tutorial</a> to learn how to choose the right state model and constraints for your system, and how to implement it. In many cases, the built-in features meet your requirements. And best of all, Helix is a customizable framework, so you can plug in your own behavior, while retaining the automation provided by Helix.</p>
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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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+ <li class="divider">/</li>
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+ <li><a href="../1.0.4-docs/" title="Release 1.0.4">Release 1.0.4</a></li>
+ <li class="divider">/</li>
+ <li>Tutorial</li>
+ <li class="publishDate version-date pull-right">Last Published: 2022-05-11</li>
+ </ul>
+ </div>
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+
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+ <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.
+-->
+<div class="page-header">
+ <h1>Helix Tutorial</h1>
+</div>
+<p>In this tutorial, we will cover the roles of a Helix-managed cluster, and show the code you need to write to integrate with it. In many cases, there is a simple default behavior that is often appropriate, but you can also customize the behavior.</p>
+<p>Convention: we first cover the <i>basic</i> approach, which is the easiest to implement. Then, we'll describe <i>advanced</i> options, which give you more control over the system behavior, but require you to write more code.</p>
+<section>
+ <section>
+ <h3 id="Prerequisites">Prerequisites</h3>
+ <ol style="list-style-type: decimal">
+ <li>Read <a href="../Concepts.html">Concepts/Terminology</a> and <a href="../Architecture.html">Architecture</a></li>
+ <li>Read the <a href="./Quickstart.html">Quickstart guide</a> to learn how Helix models and manages a cluster</li>
+ <li>Install Helix source. See: <a href="./Quickstart.html">Quickstart</a> for the steps.</li>
+ </ol>
+ </section>
+ <section>
+ <h3 id="Tutorial_Outline">Tutorial Outline</h3>
+ <ol style="list-style-type: decimal">
+ <li><a href="./tutorial_participant.html">Participant</a></li>
+ <li><a href="./tutorial_spectator.html">Spectator</a></li>
+ <li><a href="./tutorial_controller.html">Controller</a></li>
+ <li><a href="./tutorial_rebalance.html">Rebalancing Algorithms</a></li>
+ <li><a href="./tutorial_user_def_rebalancer.html">User-Defined Rebalancing</a></li>
+ <li><a href="./tutorial_state.html">State Machines</a></li>
+ <li><a href="./tutorial_messaging.html">Messaging</a></li>
+ <li><a href="./tutorial_health.html">Customized health check</a></li>
+ <li><a href="./tutorial_throttling.html">Throttling</a></li>
+ <li><a href="./tutorial_propstore.html">Application Property Store</a></li>
+ <li><a href="./tutorial_admin.html">Admin Interface</a></li>
+ <li><a href="./tutorial_yaml.html">YAML Cluster Setup</a></li>
+ <li><a href="./tutorial_agent.html">Helix Agent (for non-JVM systems)</a></li>
+ <li><a href="./tutorial_task_framework.html">Task Framework</a>
+ <ol style="list-style-type: decimal">
+ <li><a href="./tutorial_user_content_store.html">Task with User Defined Content Store</a></li>
+ <li><a href="./tutorial_task_throttling.html">Task Throttling</a></li>
+ <li><a href="./quota_scheduling.html">Quota-based Scheduling</a></li>
+ </ol> </li>
+ <li><a href="./tutorial_rest_service.html">Helix REST Service 2.0</a></li>
+ <li><a href="./tutorial_ui.html">Helix UI Setup</a></li>
+ <li><a href="./tutorial_customized_view.html">Helix Customized View</a></li>
+ <li><a href="./tutorial_cloud_support.html">Helix Cloud Support</a></li>
+ <li><a href="./tutorial_distributed_lock.html">Helix Distributed Lock</a></li>
+ </ol>
+ </section>
+ <section>
+ <h3 id="Preliminaries">Preliminaries</h3>
+ <p>First, we need to set up the system. Let's walk through the steps in building a distributed system using Helix.</p>
+ <section>
+ <h4 id="Start_ZooKeeper">Start ZooKeeper</h4>
+ <p>This starts a zookeeper in standalone mode. For production deployment, see <a class="externalLink" href="http://zookeeper.apache.org">Apache ZooKeeper</a> for instructions.</p>
+ <div class="source">
+ <pre><code>./start-standalone-zookeeper.sh 2199 &
+</code></pre>
+ </div>
+ </section>
+ <section>
+ <h4 id="Create_a_Cluster">Create a Cluster</h4>
+ <p>Creating a cluster will define the cluster in appropriate znodes on ZooKeeper.</p>
+ <p>Using the Java API:</p>
+ <div class="source">
+ <pre><code>// Create setup tool instance
+// Note: ZK_ADDRESS is the host:port of Zookeeper
+String ZK_ADDRESS = "localhost:2199";
+admin = new ZKHelixAdmin(ZK_ADDRESS);
+
+String CLUSTER_NAME = "helix-demo";
+//Create cluster namespace in zookeeper
+admin.addCluster(CLUSTER_NAME);
+</code></pre>
+ </div>
+ <p>OR</p>
+ <p>Using the command-line interface:</p>
+ <div class="source">
+ <pre><code>./helix-admin.sh --zkSvr localhost:2199 --addCluster helix-demo
+</code></pre>
+ </div>
+ </section>
+ <section>
+ <h4 id="Configure_the_Nodes_of_the_Cluster">Configure the Nodes of the Cluster</h4>
+ <p>First we'll add new nodes to the cluster, then configure the nodes in the cluster. Each node in the cluster must be uniquely identifiable. The most commonly used convention is hostname:port.</p>
+ <div class="source">
+ <pre><code>String CLUSTER_NAME = "helix-demo";
+int NUM_NODES = 2;
+String hosts[] = new String[]{"localhost","localhost"};
+String ports[] = new String[]{"7000","7001"};
+for (int i = 0; i < NUM_NODES; i++)
+{
+ InstanceConfig instanceConfig = new InstanceConfig(hosts[i]+ "_" + ports[i]);
+ instanceConfig.setHostName(hosts[i]);
+ instanceConfig.setPort(ports[i]);
+ instanceConfig.setInstanceEnabled(true);
+
+ //Add additional system specific configuration if needed. These can be accessed during the node start up.
+ instanceConfig.getRecord().setSimpleField("key", "value");
+ admin.addInstance(CLUSTER_NAME, instanceConfig);
+}
+</code></pre>
+ </div>
+ </section>
+ <section>
+ <h4 id="Configure_the_Resource">Configure the Resource</h4>
+ <p>A <b>resource</b> represents the actual task performed by the nodes. It can be a database, index, topic, queue or any other processing entity. A resource can be divided into many sub-parts known as <b>partitions</b>.</p>
+ <section>
+ <h5 id="Define_the_State_Model_and_Constraints">Define the State Model and Constraints</h5>
+ <p>For scalability and fault tolerance, each partition can have one or more replicas. The <b>state model</b> allows one to declare the system behavior by first enumerating the various STATES, and the TRANSITIONS between them. A simple model is ONLINE-OFFLINE where ONLINE means the task is active and OFFLINE means it's not active. You can also specify how many replicas must be in each state, these are known as <b>constraints</b>. For example, in a search system, one might need more than one node serving the same index to handle the load.</p>
+ <p>The allowed states:</p>
+ <ul>
+ <li>LEADER</li>
+ <li>STANDBY</li>
+ <li>OFFLINE</li>
+ </ul>
+ <p>The allowed transitions:</p>
+ <ul>
+ <li>OFFLINE to STANDBY</li>
+ <li>STANDBY to OFFLINE</li>
+ <li>STANDBY to LEADER</li>
+ <li>LEADER to STANDBY</li>
+ </ul>
+ <p>The constraints:</p>
+ <ul>
+ <li>no more than 1 LEADER per partition</li>
+ <li>the rest of the replicas should be STANDBYs</li>
+ </ul>
+ <p>The following snippet shows how to declare the state model and constraints for the LEADER-STANDBY model.</p>
+ <div class="source">
+ <pre><code>String STATE_MODEL_NAME = "LeaderStandby";
+StateModelDefinition.Builder builder = new StateModelDefinition.Builder(STATE_MODEL_NAME);
+// Define your own states: those are opaque strings to Helix
+// Only the topology of the state machine (initial state, transitions, priorities, final DROPPED state) is meaningful to Helix
+String LEADER = "LEADER";
+String STANDBY = "STANDBY";
+String OFFLINE = "OFFLINE";
+
+// Add states and their rank to indicate priority. A lower rank corresponds to a higher priority
+builder.addState(LEADER, 1);
+builder.addState(STANDBY, 2);
+builder.addState(OFFLINE);
+// Note the special inclusion of the DROPPED state (REQUIRED)
+builder.addState(HelixDefinedState.DROPPED.name());
+
+// Set the initial state when the node starts
+builder.initialState(OFFLINE);
+
+// Add transitions between the states.
+builder.addTransition(OFFLINE, STANDBY);
+builder.addTransition(STANDBY, OFFLINE);
+builder.addTransition(STANDBY, LEADER);
+builder.addTransition(LEADER, STANDBY);
+
+// There must be a path to DROPPED from each state (REQUIRED)
+builder.addTransition(OFFLINE, HelixDefinedState.DROPPED.name());
+
+// set constraints on states
+
+// static constraint: upper bound of 1 LEADER
+builder.upperBound(LEADER, 1);
+
+// dynamic constraint: R means it should be derived based on the replication factor for the cluster
+// this allows a different replication factor for each resource without
+// having to define a new state model
+
+builder.dynamicUpperBound(STANDBY, "R");
+
+StateModelDefinition myStateModel = builder.build();
+admin.addStateModelDef(CLUSTER_NAME, STATE_MODEL_NAME, myStateModel);
+</code></pre>
+ </div>
+ </section>
+ <section>
+ <h5 id="Assigning_Partitions_to_Nodes">Assigning Partitions to Nodes</h5>
+ <p>The final goal of Helix is to ensure that the constraints on the state model are satisfied. Helix does this by assigning a <b>state</b> to a partition (such as LEADER, STANDBY), and placing it on a particular node.</p>
+ <p>There are 3 assignment modes Helix can operate in:</p>
+ <ul>
+ <li>FULL_AUTO: Helix decides the placement and state of a partition.</li>
+ <li>SEMI_AUTO: Application decides the placement but Helix decides the state of a partition.</li>
+ <li>CUSTOMIZED: Application controls the placement and state of a partition.</li>
+ </ul>
+ <p>For more information on the assignment modes, see the <a href="./tutorial_rebalance.html">Rebalancing Algorithms</a> section of this tutorial.</p>
+ <div class="source">
+ <pre><code>String RESOURCE_NAME = "MyDB";
+int NUM_PARTITIONS = 6;
+String STATE_MODEL_NAME = "LeaderStandby";
+String MODE = "SEMI_AUTO";
+int NUM_REPLICAS = 2;
+
+admin.addResource(CLUSTER_NAME, RESOURCE_NAME, NUM_PARTITIONS, STATE_MODEL_NAME, MODE);
+admin.rebalance(CLUSTER_NAME, RESOURCE_NAME, NUM_REPLICAS);
+</code></pre>
+ </div>
+ </section>
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\ No newline at end of file
Added: helix/site-content/1.0.5-docs/WorkflowExample.json
URL: http://svn.apache.org/viewvc/helix/site-content/1.0.5-docs/WorkflowExample.json?rev=1900823&view=auto
==============================================================================
--- helix/site-content/1.0.5-docs/WorkflowExample.json (added)
+++ helix/site-content/1.0.5-docs/WorkflowExample.json Thu May 12 05:29:03 2022
@@ -0,0 +1,46 @@
+{"id":"Workflow1",
+ "WorkflowConfig":{
+ "id":"Workflow1",
+ "Expiry":"43200000",
+ "FailureThreshold":"0",
+ "IsJobQueue":"true",
+ "TargetState":"START",
+ "Terminable":"false",
+ "capacity":"500"
+ },
+ "Jobs":[
+ {
+ "id" : "Job1",
+ "simpleFields": {
+ "JobID":"Job1",
+ "WorkflowID" : "Workflow1"
+ },
+ "mapFields":{
+ "Task1" : {
+ "TASK_ID" : "Task1",
+ "TASK_COMMAND" : "Backup",
+ "TASK_TARGET_PARTITION" : "p1"
+ },
+ "Task2" : {
+ "TASK_ID" : "Task2",
+ "TASK_COMMAND" : "ReIndex"
+ }
+ },
+ "listFields":{}
+ },
+ {
+ "id":"Job2",
+ "Command":"Cleanup",
+ "TargetResource":"DB2"
+ },
+ {
+ "id":"Job3",
+ "Command":"Backup",
+ "TargetResource":"DB3"
+ }
+ ],
+ "ParentJobs":{
+ "Job1":["Job2","Job3],
+ "Job2":["Job3"]
+ }
+}
\ No newline at end of file