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<div class="subTitle">org.apache.drill.yarn.appMaster</div>
<h2 title="Class ClusterControllerImpl" class="title">Class ClusterControllerImpl</h2>
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<li>org.apache.drill.yarn.appMaster.ClusterControllerImpl</li>
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<dt>All Implemented Interfaces:</dt>
<dd><a href="../../../../../org/apache/drill/yarn/appMaster/ClusterController.html" title="interface in org.apache.drill.yarn.appMaster">ClusterController</a>, <a href="../../../../../org/apache/drill/yarn/appMaster/RegistryHandler.html" title="interface in org.apache.drill.yarn.appMaster">RegistryHandler</a></dd>
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<pre>public class <span class="typeNameLabel">ClusterControllerImpl</span>
extends <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a>
implements <a href="../../../../../org/apache/drill/yarn/appMaster/ClusterController.html" title="interface in org.apache.drill.yarn.appMaster">ClusterController</a></pre>
<div class="block">Controls the Drill cluster by representing the current cluster state with a
desired state, taking corrective action to keep the cluster in the desired
state. The cluster as a whole has a state, as do each task (node) within the
cluster.
<p>
This class is designed to allow unit tests. In general, testing the
controller on a live cluster is tedious. This class encapsulates the
controller algorithm so it can be driven by a simulated cluster.
<p>
This object is shared between threads, thus synchronized.</div>
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<th class="colFirst" scope="col">Modifier and Type</th>
<th class="colLast" scope="col">Class and Description</th>
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<td class="colFirst"><code>static class&nbsp;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/drill/yarn/appMaster/ClusterControllerImpl.State.html" title="enum in org.apache.drill.yarn.appMaster">ClusterControllerImpl.State</a></span></code>
<div class="block">Controller lifecycle state.</div>
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<td class="colFirst"><code>protected int</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/drill/yarn/appMaster/ClusterControllerImpl.html#maxRetries">maxRetries</a></span></code>
<div class="block">Maximum number of retries for each task launch.</div>
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<th class="colOne" scope="col">Constructor and Description</th>
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<td class="colOne"><code><span class="memberNameLink"><a href="../../../../../org/apache/drill/yarn/appMaster/ClusterControllerImpl.html#ClusterControllerImpl-org.apache.drill.yarn.appMaster.AMYarnFacade-">ClusterControllerImpl</a></span>(<a href="../../../../../org/apache/drill/yarn/appMaster/AMYarnFacade.html" title="interface in org.apache.drill.yarn.appMaster">AMYarnFacade</a>&nbsp;yarn)</code>&nbsp;</td>
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<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/drill/yarn/appMaster/ClusterControllerImpl.html#cancelTask-int-">cancelTask</a></span>(int&nbsp;id)</code>
<div class="block">Cancels the given task, reducing the target task count.</div>
</td>
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<tr id="i1" class="rowColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/drill/yarn/appMaster/ClusterControllerImpl.html#completionAck-org.apache.drill.yarn.appMaster.Task-java.lang.String-">completionAck</a></span>(<a href="../../../../../org/apache/drill/yarn/appMaster/Task.html" title="class in org.apache.drill.yarn.appMaster">Task</a>&nbsp;task,
<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>&nbsp;propertyKey)</code>&nbsp;</td>
</tr>
<tr id="i2" class="altColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/drill/yarn/appMaster/ClusterControllerImpl.html#containerAllocated-org.apache.drill.yarn.appMaster.Task-">containerAllocated</a></span>(<a href="../../../../../org/apache/drill/yarn/appMaster/Task.html" title="class in org.apache.drill.yarn.appMaster">Task</a>&nbsp;task)</code>&nbsp;</td>
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<tr id="i3" class="rowColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/drill/yarn/appMaster/ClusterControllerImpl.html#containerReleased-org.apache.drill.yarn.appMaster.Task-">containerReleased</a></span>(<a href="../../../../../org/apache/drill/yarn/appMaster/Task.html" title="class in org.apache.drill.yarn.appMaster">Task</a>&nbsp;task)</code>&nbsp;</td>
</tr>
<tr id="i4" class="altColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/drill/yarn/appMaster/ClusterControllerImpl.html#containersAllocated-java.util.List-">containersAllocated</a></span>(<a href="https://docs.oracle.com/javase/8/docs/api/java/util/List.html?is-external=true" title="class or interface in java.util">List</a>&lt;org.apache.hadoop.yarn.api.records.Container&gt;&nbsp;containers)</code>
<div class="block">The RM has allocated one or more containers in response to container
requests submitted to the RM.</div>
</td>
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<tr id="i5" class="rowColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/drill/yarn/appMaster/ClusterControllerImpl.html#containersCompleted-java.util.List-">containersCompleted</a></span>(<a href="https://docs.oracle.com/javase/8/docs/api/java/util/List.html?is-external=true" title="class or interface in java.util">List</a>&lt;org.apache.hadoop.yarn.api.records.ContainerStatus&gt;&nbsp;statuses)</code>
<div class="block">The Resource Manager reports that containers have completed with the given
statuses.</div>
</td>
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<tr id="i6" class="altColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/drill/yarn/appMaster/ClusterControllerImpl.html#containerStarted-org.apache.hadoop.yarn.api.records.ContainerId-">containerStarted</a></span>(org.apache.hadoop.yarn.api.records.ContainerId&nbsp;containerId)</code>
<div class="block">The NM reports that a container has successfully started.</div>
</td>
</tr>
<tr id="i7" class="rowColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/drill/yarn/appMaster/ClusterControllerImpl.html#containerStopped-org.apache.hadoop.yarn.api.records.ContainerId-">containerStopped</a></span>(org.apache.hadoop.yarn.api.records.ContainerId&nbsp;containerId)</code>
<div class="block">The Node Manager reports that a container has stopped.</div>
</td>
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<tr id="i8" class="altColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/drill/yarn/appMaster/ClusterControllerImpl.html#enableFailureCheck-boolean-">enableFailureCheck</a></span>(boolean&nbsp;flag)</code>&nbsp;</td>
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<tr id="i9" class="rowColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/drill/yarn/appMaster/ClusterControllerImpl.html#fireLifecycleChange-org.apache.drill.yarn.appMaster.TaskLifecycleListener.Event-org.apache.drill.yarn.appMaster.EventContext-">fireLifecycleChange</a></span>(<a href="../../../../../org/apache/drill/yarn/appMaster/TaskLifecycleListener.Event.html" title="enum in org.apache.drill.yarn.appMaster">TaskLifecycleListener.Event</a>&nbsp;event,
<a href="../../../../../org/apache/drill/yarn/appMaster/EventContext.html" title="class in org.apache.drill.yarn.appMaster">EventContext</a>&nbsp;context)</code>&nbsp;</td>
</tr>
<tr id="i10" class="altColor">
<td class="colFirst"><code>int</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/drill/yarn/appMaster/ClusterControllerImpl.html#getFreeNodeCount--">getFreeNodeCount</a></span>()</code>
<div class="block">Get the approximate number of free YARN nodes (those that can
accept a task request.) Starts with the number of nodes from
the node inventory, then subtracts any in-flight requests (which
do not, by definition, have node allocated.)</div>
</td>
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<tr id="i11" class="rowColor">
<td class="colFirst"><code><a href="https://docs.oracle.com/javase/8/docs/api/java/util/List.html?is-external=true" title="class or interface in java.util">List</a>&lt;<a href="../../../../../org/apache/drill/yarn/appMaster/Task.html" title="class in org.apache.drill.yarn.appMaster">Task</a>&gt;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/drill/yarn/appMaster/ClusterControllerImpl.html#getHistory--">getHistory</a></span>()</code>&nbsp;</td>
</tr>
<tr id="i12" class="altColor">
<td class="colFirst"><code>int</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/drill/yarn/appMaster/ClusterControllerImpl.html#getMaxRetries--">getMaxRetries</a></span>()</code>&nbsp;</td>
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<tr id="i13" class="rowColor">
<td class="colFirst"><code><a href="../../../../../org/apache/drill/yarn/appMaster/NodeInventory.html" title="class in org.apache.drill.yarn.appMaster">NodeInventory</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/drill/yarn/appMaster/ClusterControllerImpl.html#getNodeInventory--">getNodeInventory</a></span>()</code>&nbsp;</td>
</tr>
<tr id="i14" class="altColor">
<td class="colFirst"><code><a href="https://docs.oracle.com/javase/8/docs/api/java/util/List.html?is-external=true" title="class or interface in java.util">List</a>&lt;<a href="../../../../../org/apache/drill/yarn/appMaster/SchedulerStateActions.html" title="interface in org.apache.drill.yarn.appMaster">SchedulerStateActions</a>&gt;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/drill/yarn/appMaster/ClusterControllerImpl.html#getPools--">getPools</a></span>()</code>&nbsp;</td>
</tr>
<tr id="i15" class="rowColor">
<td class="colFirst"><code>float</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/drill/yarn/appMaster/ClusterControllerImpl.html#getProgress--">getProgress</a></span>()</code>&nbsp;</td>
</tr>
<tr id="i16" class="altColor">
<td class="colFirst"><code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/drill/yarn/appMaster/ClusterControllerImpl.html#getProperty-java.lang.String-">getProperty</a></span>(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>&nbsp;key)</code>&nbsp;</td>
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<tr id="i17" class="rowColor">
<td class="colFirst"><code><a href="../../../../../org/apache/drill/yarn/appMaster/ClusterControllerImpl.State.html" title="enum in org.apache.drill.yarn.appMaster">ClusterControllerImpl.State</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/drill/yarn/appMaster/ClusterControllerImpl.html#getState--">getState</a></span>()</code>&nbsp;</td>
</tr>
<tr id="i18" class="altColor">
<td class="colFirst"><code>int</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/drill/yarn/appMaster/ClusterControllerImpl.html#getStopTimeoutMs--">getStopTimeoutMs</a></span>()</code>&nbsp;</td>
</tr>
<tr id="i19" class="rowColor">
<td class="colFirst"><code>int</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/drill/yarn/appMaster/ClusterControllerImpl.html#getTargetCount--">getTargetCount</a></span>()</code>
<div class="block">Return the target number of tasks that the controller seeks to maintain.</div>
</td>
</tr>
<tr id="i20" class="altColor">
<td class="colFirst"><code><a href="../../../../../org/apache/drill/yarn/appMaster/AMYarnFacade.html" title="interface in org.apache.drill.yarn.appMaster">AMYarnFacade</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/drill/yarn/appMaster/ClusterControllerImpl.html#getYarn--">getYarn</a></span>()</code>&nbsp;</td>
</tr>
<tr id="i21" class="rowColor">
<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/drill/yarn/appMaster/ClusterControllerImpl.html#isLive--">isLive</a></span>()</code>&nbsp;</td>
</tr>
<tr id="i22" class="altColor">
<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/drill/yarn/appMaster/ClusterControllerImpl.html#isTaskLive-int-">isTaskLive</a></span>(int&nbsp;id)</code>&nbsp;</td>
</tr>
<tr id="i23" class="rowColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/drill/yarn/appMaster/ClusterControllerImpl.html#registerLifecycleListener-org.apache.drill.yarn.appMaster.TaskLifecycleListener-">registerLifecycleListener</a></span>(<a href="../../../../../org/apache/drill/yarn/appMaster/TaskLifecycleListener.html" title="interface in org.apache.drill.yarn.appMaster">TaskLifecycleListener</a>&nbsp;listener)</code>&nbsp;</td>
</tr>
<tr id="i24" class="altColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/drill/yarn/appMaster/ClusterControllerImpl.html#registerScheduler-org.apache.drill.yarn.appMaster.Scheduler-">registerScheduler</a></span>(<a href="../../../../../org/apache/drill/yarn/appMaster/Scheduler.html" title="interface in org.apache.drill.yarn.appMaster">Scheduler</a>&nbsp;scheduler)</code>
<div class="block">Define a task type.</div>
</td>
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<tr id="i25" class="rowColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/drill/yarn/appMaster/ClusterControllerImpl.html#registryDown--">registryDown</a></span>()</code>&nbsp;</td>
</tr>
<tr id="i26" class="altColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/drill/yarn/appMaster/ClusterControllerImpl.html#releaseHost-java.lang.String-">releaseHost</a></span>(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>&nbsp;hostName)</code>&nbsp;</td>
</tr>
<tr id="i27" class="rowColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/drill/yarn/appMaster/ClusterControllerImpl.html#reserveHost-java.lang.String-">reserveHost</a></span>(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>&nbsp;hostName)</code>&nbsp;</td>
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<tr id="i28" class="altColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/drill/yarn/appMaster/ClusterControllerImpl.html#resizeDelta-int-">resizeDelta</a></span>(int&nbsp;delta)</code>
<div class="block">Request to resize the Drill cluster by a relative amount.</div>
</td>
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<tr id="i29" class="rowColor">
<td class="colFirst"><code>int</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/drill/yarn/appMaster/ClusterControllerImpl.html#resizeTo-int-">resizeTo</a></span>(int&nbsp;n)</code>
<div class="block">Request to resize the Drill cluster to the given size.</div>
</td>
</tr>
<tr id="i30" class="altColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/drill/yarn/appMaster/ClusterControllerImpl.html#setMaxRetries-int-">setMaxRetries</a></span>(int&nbsp;value)</code>&nbsp;</td>
</tr>
<tr id="i31" class="rowColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/drill/yarn/appMaster/ClusterControllerImpl.html#setProperty-java.lang.String-java.lang.Object-">setProperty</a></span>(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>&nbsp;key,
<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a>&nbsp;value)</code>&nbsp;</td>
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<tr id="i32" class="altColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/drill/yarn/appMaster/ClusterControllerImpl.html#shutDown--">shutDown</a></span>()</code>
<div class="block">Indicates a request to gracefully shut down the cluster.</div>
</td>
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<tr id="i33" class="rowColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/drill/yarn/appMaster/ClusterControllerImpl.html#startAck-org.apache.drill.yarn.appMaster.Task-java.lang.String-java.lang.Object-">startAck</a></span>(<a href="../../../../../org/apache/drill/yarn/appMaster/Task.html" title="class in org.apache.drill.yarn.appMaster">Task</a>&nbsp;task,
<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>&nbsp;propertyKey,
<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a>&nbsp;value)</code>&nbsp;</td>
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<tr id="i34" class="altColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/drill/yarn/appMaster/ClusterControllerImpl.html#started--">started</a></span>()</code>
<div class="block">Called when the caller has completed start-up and the controller should
become live.</div>
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<tr id="i35" class="rowColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/drill/yarn/appMaster/ClusterControllerImpl.html#stopTaskFailed-org.apache.hadoop.yarn.api.records.ContainerId-java.lang.Throwable-">stopTaskFailed</a></span>(org.apache.hadoop.yarn.api.records.ContainerId&nbsp;containerId,
<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Throwable.html?is-external=true" title="class or interface in java.lang">Throwable</a>&nbsp;t)</code>
<div class="block">The Node Manager API reports that a request sent to the NM to stop a task
has failed.</div>
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<tr id="i36" class="altColor">
<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/drill/yarn/appMaster/ClusterControllerImpl.html#succeeded--">succeeded</a></span>()</code>&nbsp;</td>
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<tr id="i37" class="rowColor">
<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/drill/yarn/appMaster/ClusterControllerImpl.html#supportsDiskResource--">supportsDiskResource</a></span>()</code>
<div class="block">Whether this distribution of YARN supports disk resources.</div>
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<tr id="i38" class="altColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/drill/yarn/appMaster/ClusterControllerImpl.html#taskEnded-org.apache.drill.yarn.appMaster.Task-">taskEnded</a></span>(<a href="../../../../../org/apache/drill/yarn/appMaster/Task.html" title="class in org.apache.drill.yarn.appMaster">Task</a>&nbsp;task)</code>&nbsp;</td>
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<tr id="i39" class="rowColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/drill/yarn/appMaster/ClusterControllerImpl.html#taskGroupCompleted-org.apache.drill.yarn.appMaster.SchedulerStateActions-">taskGroupCompleted</a></span>(<a href="../../../../../org/apache/drill/yarn/appMaster/SchedulerStateActions.html" title="interface in org.apache.drill.yarn.appMaster">SchedulerStateActions</a>&nbsp;taskGroup)</code>&nbsp;</td>
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<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/drill/yarn/appMaster/ClusterControllerImpl.html#taskRetried-org.apache.drill.yarn.appMaster.Task-">taskRetried</a></span>(<a href="../../../../../org/apache/drill/yarn/appMaster/Task.html" title="class in org.apache.drill.yarn.appMaster">Task</a>&nbsp;task)</code>&nbsp;</td>
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<tr id="i41" class="rowColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/drill/yarn/appMaster/ClusterControllerImpl.html#taskStartFailed-org.apache.hadoop.yarn.api.records.ContainerId-java.lang.Throwable-">taskStartFailed</a></span>(org.apache.hadoop.yarn.api.records.ContainerId&nbsp;containerId,
<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Throwable.html?is-external=true" title="class or interface in java.lang">Throwable</a>&nbsp;t)</code>
<div class="block">The RM API reports that an attempt to start a container has failed locally.</div>
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<tr id="i42" class="altColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/drill/yarn/appMaster/ClusterControllerImpl.html#tick-long-">tick</a></span>(long&nbsp;curTime)</code>
<div class="block">Called by the timer ("pulse") thread to trigger time-based events.</div>
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<tr id="i43" class="rowColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/drill/yarn/appMaster/ClusterControllerImpl.html#updateRMStatus--">updateRMStatus</a></span>()</code>
<div class="block">Get an update from YARN on available resources.</div>
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<tr id="i44" class="altColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/drill/yarn/appMaster/ClusterControllerImpl.html#visit-org.apache.drill.yarn.appMaster.ControllerVisitor-">visit</a></span>(<a href="../../../../../org/apache/drill/yarn/appMaster/ControllerVisitor.html" title="interface in org.apache.drill.yarn.appMaster">ControllerVisitor</a>&nbsp;visitor)</code>
<div class="block">Allow an observer to see a consistent view of the controller's
state by performing the visit in a synchronized block.</div>
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<tr id="i45" class="rowColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/drill/yarn/appMaster/ClusterControllerImpl.html#visitTasks-org.apache.drill.yarn.appMaster.TaskVisitor-">visitTasks</a></span>(<a href="../../../../../org/apache/drill/yarn/appMaster/TaskVisitor.html" title="interface in org.apache.drill.yarn.appMaster">TaskVisitor</a>&nbsp;visitor)</code>
<div class="block">Allow an observer to see a consistent view of the controller's
task state by performing the visit in a synchronized block.</div>
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<tr id="i46" class="altColor">
<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/drill/yarn/appMaster/ClusterControllerImpl.html#waitForCompletion--">waitForCompletion</a></span>()</code>
<div class="block">Called by the main thread to wait for the normal shutdown of the
controller.</div>
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<pre>protected&nbsp;int maxRetries</pre>
<div class="block">Maximum number of retries for each task launch.</div>
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<pre>public&nbsp;ClusterControllerImpl(<a href="../../../../../org/apache/drill/yarn/appMaster/AMYarnFacade.html" title="interface in org.apache.drill.yarn.appMaster">AMYarnFacade</a>&nbsp;yarn)</pre>
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<pre>public&nbsp;void&nbsp;enableFailureCheck(boolean&nbsp;flag)</pre>
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<dd><code><a href="../../../../../org/apache/drill/yarn/appMaster/ClusterController.html#enableFailureCheck-boolean-">enableFailureCheck</a></code>&nbsp;in interface&nbsp;<code><a href="../../../../../org/apache/drill/yarn/appMaster/ClusterController.html" title="interface in org.apache.drill.yarn.appMaster">ClusterController</a></code></dd>
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<pre>public&nbsp;void&nbsp;registerScheduler(<a href="../../../../../org/apache/drill/yarn/appMaster/Scheduler.html" title="interface in org.apache.drill.yarn.appMaster">Scheduler</a>&nbsp;scheduler)</pre>
<div class="block">Define a task type. Registration order is important: the controller starts
task in the order that they are registered. Must happen before the YARN
callbacks start.</div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="../../../../../org/apache/drill/yarn/appMaster/ClusterController.html#registerScheduler-org.apache.drill.yarn.appMaster.Scheduler-">registerScheduler</a></code>&nbsp;in interface&nbsp;<code><a href="../../../../../org/apache/drill/yarn/appMaster/ClusterController.html" title="interface in org.apache.drill.yarn.appMaster">ClusterController</a></code></dd>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>scheduler</code> - </dd>
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<pre>public&nbsp;void&nbsp;started()
throws <a href="../../../../../org/apache/drill/yarn/appMaster/YarnFacadeException.html" title="class in org.apache.drill.yarn.appMaster">YarnFacadeException</a>,
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<div class="block">Called when the caller has completed start-up and the controller should
become live.</div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="../../../../../org/apache/drill/yarn/appMaster/ClusterController.html#started--">started</a></code>&nbsp;in interface&nbsp;<code><a href="../../../../../org/apache/drill/yarn/appMaster/ClusterController.html" title="interface in org.apache.drill.yarn.appMaster">ClusterController</a></code></dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="../../../../../org/apache/drill/yarn/appMaster/YarnFacadeException.html" title="class in org.apache.drill.yarn.appMaster">YarnFacadeException</a></code></dd>
<dd><code><a href="../../../../../org/apache/drill/yarn/appMaster/AMException.html" title="class in org.apache.drill.yarn.appMaster">AMException</a></code></dd>
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<pre>public&nbsp;void&nbsp;tick(long&nbsp;curTime)</pre>
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<div class="block">Called by the timer ("pulse") thread to trigger time-based events.</div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="../../../../../org/apache/drill/yarn/appMaster/ClusterController.html#tick-long-">tick</a></code>&nbsp;in interface&nbsp;<code><a href="../../../../../org/apache/drill/yarn/appMaster/ClusterController.html" title="interface in org.apache.drill.yarn.appMaster">ClusterController</a></code></dd>
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<pre>public&nbsp;int&nbsp;getFreeNodeCount()</pre>
<div class="block">Get the approximate number of free YARN nodes (those that can
accept a task request.) Starts with the number of nodes from
the node inventory, then subtracts any in-flight requests (which
do not, by definition, have node allocated.)
<p>
This approximation <b>does not</b> consider whether the node
has sufficient resources to run a task; only whether the node
itself exists.</div>
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<dt><span class="returnLabel">Returns:</span></dt>
<dd>The approximate number of free YARN nodes.</dd>
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<pre>public&nbsp;void&nbsp;updateRMStatus()</pre>
<div class="block">Get an update from YARN on available resources.</div>
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<dd><code><a href="../../../../../org/apache/drill/yarn/appMaster/ClusterController.html#updateRMStatus--">updateRMStatus</a></code>&nbsp;in interface&nbsp;<code><a href="../../../../../org/apache/drill/yarn/appMaster/ClusterController.html" title="interface in org.apache.drill.yarn.appMaster">ClusterController</a></code></dd>
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<div class="block"><span class="descfrmTypeLabel">Description copied from interface:&nbsp;<code><a href="../../../../../org/apache/drill/yarn/appMaster/ClusterController.html#containersAllocated-java.util.List-">ClusterController</a></code></span></div>
<div class="block">The RM has allocated one or more containers in response to container
requests submitted to the RM.</div>
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<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="../../../../../org/apache/drill/yarn/appMaster/ClusterController.html#containersAllocated-java.util.List-">containersAllocated</a></code>&nbsp;in interface&nbsp;<code><a href="../../../../../org/apache/drill/yarn/appMaster/ClusterController.html" title="interface in org.apache.drill.yarn.appMaster">ClusterController</a></code></dd>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>containers</code> - the set of containers provided by YARN</dd>
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<pre>public&nbsp;void&nbsp;containerStarted(org.apache.hadoop.yarn.api.records.ContainerId&nbsp;containerId)</pre>
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<div class="block">The NM reports that a container has successfully started.</div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="../../../../../org/apache/drill/yarn/appMaster/ClusterController.html#containerStarted-org.apache.hadoop.yarn.api.records.ContainerId-">containerStarted</a></code>&nbsp;in interface&nbsp;<code><a href="../../../../../org/apache/drill/yarn/appMaster/ClusterController.html" title="interface in org.apache.drill.yarn.appMaster">ClusterController</a></code></dd>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>containerId</code> - the container which started</dd>
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<pre>public&nbsp;void&nbsp;taskStartFailed(org.apache.hadoop.yarn.api.records.ContainerId&nbsp;containerId,
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<div class="block"><span class="descfrmTypeLabel">Description copied from interface:&nbsp;<code><a href="../../../../../org/apache/drill/yarn/appMaster/ClusterController.html#taskStartFailed-org.apache.hadoop.yarn.api.records.ContainerId-java.lang.Throwable-">ClusterController</a></code></span></div>
<div class="block">The RM API reports that an attempt to start a container has failed locally.</div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="../../../../../org/apache/drill/yarn/appMaster/ClusterController.html#taskStartFailed-org.apache.hadoop.yarn.api.records.ContainerId-java.lang.Throwable-">taskStartFailed</a></code>&nbsp;in interface&nbsp;<code><a href="../../../../../org/apache/drill/yarn/appMaster/ClusterController.html" title="interface in org.apache.drill.yarn.appMaster">ClusterController</a></code></dd>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>containerId</code> - the container that failed to launch</dd>
<dd><code>t</code> - the error that occurred</dd>
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<pre>public&nbsp;void&nbsp;containerStopped(org.apache.hadoop.yarn.api.records.ContainerId&nbsp;containerId)</pre>
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<div class="block">The Node Manager reports that a container has stopped.</div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="../../../../../org/apache/drill/yarn/appMaster/ClusterController.html#containerStopped-org.apache.hadoop.yarn.api.records.ContainerId-">containerStopped</a></code>&nbsp;in interface&nbsp;<code><a href="../../../../../org/apache/drill/yarn/appMaster/ClusterController.html" title="interface in org.apache.drill.yarn.appMaster">ClusterController</a></code></dd>
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<div class="block">The Resource Manager reports that containers have completed with the given
statuses. Find the task for each container and mark them as completed.</div>
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<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="../../../../../org/apache/drill/yarn/appMaster/ClusterController.html#containersCompleted-java.util.List-">containersCompleted</a></code>&nbsp;in interface&nbsp;<code><a href="../../../../../org/apache/drill/yarn/appMaster/ClusterController.html" title="interface in org.apache.drill.yarn.appMaster">ClusterController</a></code></dd>
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<pre>public&nbsp;float&nbsp;getProgress()</pre>
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<div class="block">Return the target number of tasks that the controller seeks to maintain.
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