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<div class="subTitle">org.apache.hadoop.yarn.server.nodemanager.containermanager.scheduler</div>
<h2 title="Class ContainerScheduler" class="title">Class ContainerScheduler</h2>
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<li>org.apache.hadoop.service.AbstractService</li>
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<li>org.apache.hadoop.yarn.server.nodemanager.containermanager.scheduler.ContainerScheduler</li>
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<pre>public class <span class="typeNameLabel">ContainerScheduler</span>
extends org.apache.hadoop.service.AbstractService
implements org.apache.hadoop.yarn.event.EventHandler&lt;<a href="../../../../../../../../org/apache/hadoop/yarn/server/nodemanager/containermanager/scheduler/ContainerSchedulerEvent.html" title="class in org.apache.hadoop.yarn.server.nodemanager.containermanager.scheduler">ContainerSchedulerEvent</a>&gt;</pre>
<div class="block">The ContainerScheduler manages a collection of runnable containers. It
ensures that a container is launched only if all its launch criteria are
met. It also ensures that OPPORTUNISTIC containers are killed to make
room for GUARANTEED containers.</div>
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<h3>Nested classes/interfaces inherited from interface&nbsp;org.apache.hadoop.service.Service</h3>
<code>org.apache.hadoop.service.Service.STATE</code></li>
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<caption><span>Constructors</span><span class="tabEnd">&nbsp;</span></caption>
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<th class="colOne" scope="col">Constructor and Description</th>
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<tr class="altColor">
<td class="colOne"><code><span class="memberNameLink"><a href="../../../../../../../../org/apache/hadoop/yarn/server/nodemanager/containermanager/scheduler/ContainerScheduler.html#ContainerScheduler-org.apache.hadoop.yarn.server.nodemanager.Context-org.apache.hadoop.yarn.event.AsyncDispatcher-org.apache.hadoop.yarn.server.nodemanager.metrics.NodeManagerMetrics-">ContainerScheduler</a></span>(<a href="../../../../../../../../org/apache/hadoop/yarn/server/nodemanager/Context.html" title="interface in org.apache.hadoop.yarn.server.nodemanager">Context</a>&nbsp;context,
org.apache.hadoop.yarn.event.AsyncDispatcher&nbsp;dispatcher,
<a href="../../../../../../../../org/apache/hadoop/yarn/server/nodemanager/metrics/NodeManagerMetrics.html" title="class in org.apache.hadoop.yarn.server.nodemanager.metrics">NodeManagerMetrics</a>&nbsp;metrics)</code>
<div class="block">Instantiate a Container Scheduler.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colOne"><code><span class="memberNameLink"><a href="../../../../../../../../org/apache/hadoop/yarn/server/nodemanager/containermanager/scheduler/ContainerScheduler.html#ContainerScheduler-org.apache.hadoop.yarn.server.nodemanager.Context-org.apache.hadoop.yarn.event.AsyncDispatcher-org.apache.hadoop.yarn.server.nodemanager.metrics.NodeManagerMetrics-int-">ContainerScheduler</a></span>(<a href="../../../../../../../../org/apache/hadoop/yarn/server/nodemanager/Context.html" title="interface in org.apache.hadoop.yarn.server.nodemanager">Context</a>&nbsp;context,
org.apache.hadoop.yarn.event.AsyncDispatcher&nbsp;dispatcher,
<a href="../../../../../../../../org/apache/hadoop/yarn/server/nodemanager/metrics/NodeManagerMetrics.html" title="class in org.apache.hadoop.yarn.server.nodemanager.metrics">NodeManagerMetrics</a>&nbsp;metrics,
int&nbsp;qLength)</code>&nbsp;</td>
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<th class="colFirst" scope="col">Modifier and Type</th>
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<td class="colFirst"><code><a href="../../../../../../../../org/apache/hadoop/yarn/server/nodemanager/containermanager/monitor/ContainersMonitor.html" title="interface in org.apache.hadoop.yarn.server.nodemanager.containermanager.monitor">ContainersMonitor</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../../org/apache/hadoop/yarn/server/nodemanager/containermanager/scheduler/ContainerScheduler.html#getContainersMonitor--">getContainersMonitor</a></span>()</code>&nbsp;</td>
</tr>
<tr id="i1" class="rowColor">
<td class="colFirst"><code>org.apache.hadoop.yarn.api.records.ResourceUtilization</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../../org/apache/hadoop/yarn/server/nodemanager/containermanager/scheduler/ContainerScheduler.html#getCurrentUtilization--">getCurrentUtilization</a></span>()</code>&nbsp;</td>
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<td class="colFirst"><code>int</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../../org/apache/hadoop/yarn/server/nodemanager/containermanager/scheduler/ContainerScheduler.html#getNumQueuedContainers--">getNumQueuedContainers</a></span>()</code>
<div class="block">Return number of queued containers.</div>
</td>
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<tr id="i3" class="rowColor">
<td class="colFirst"><code>int</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../../org/apache/hadoop/yarn/server/nodemanager/containermanager/scheduler/ContainerScheduler.html#getNumQueuedGuaranteedContainers--">getNumQueuedGuaranteedContainers</a></span>()</code>&nbsp;</td>
</tr>
<tr id="i4" class="altColor">
<td class="colFirst"><code>int</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../../org/apache/hadoop/yarn/server/nodemanager/containermanager/scheduler/ContainerScheduler.html#getNumQueuedOpportunisticContainers--">getNumQueuedOpportunisticContainers</a></span>()</code>&nbsp;</td>
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<tr id="i5" class="rowColor">
<td class="colFirst"><code>int</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../../org/apache/hadoop/yarn/server/nodemanager/containermanager/scheduler/ContainerScheduler.html#getNumRunningContainers--">getNumRunningContainers</a></span>()</code>&nbsp;</td>
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<tr id="i6" class="altColor">
<td class="colFirst"><code>org.apache.hadoop.yarn.server.api.records.OpportunisticContainersStatus</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../../org/apache/hadoop/yarn/server/nodemanager/containermanager/scheduler/ContainerScheduler.html#getOpportunisticContainersStatus--">getOpportunisticContainersStatus</a></span>()</code>&nbsp;</td>
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<td class="colFirst"><code>int</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../../org/apache/hadoop/yarn/server/nodemanager/containermanager/scheduler/ContainerScheduler.html#getOpportunisticQueueCapacity--">getOpportunisticQueueCapacity</a></span>()</code>
<div class="block">Return the capacity of the queue for opportunistic containers
on this node.</div>
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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/hadoop/yarn/server/nodemanager/containermanager/scheduler/ContainerScheduler.html#handle-org.apache.hadoop.yarn.server.nodemanager.containermanager.scheduler.ContainerSchedulerEvent-">handle</a></span>(<a href="../../../../../../../../org/apache/hadoop/yarn/server/nodemanager/containermanager/scheduler/ContainerSchedulerEvent.html" title="class in org.apache.hadoop.yarn.server.nodemanager.containermanager.scheduler">ContainerSchedulerEvent</a>&nbsp;event)</code>
<div class="block">Handle ContainerSchedulerEvents.</div>
</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/hadoop/yarn/server/nodemanager/containermanager/scheduler/ContainerScheduler.html#recoverActiveContainer-org.apache.hadoop.yarn.server.nodemanager.containermanager.container.Container-org.apache.hadoop.yarn.server.nodemanager.recovery.NMStateStoreService.RecoveredContainerState-">recoverActiveContainer</a></span>(<a href="../../../../../../../../org/apache/hadoop/yarn/server/nodemanager/containermanager/container/Container.html" title="interface in org.apache.hadoop.yarn.server.nodemanager.containermanager.container">Container</a>&nbsp;container,
<a href="../../../../../../../../org/apache/hadoop/yarn/server/nodemanager/recovery/NMStateStoreService.RecoveredContainerState.html" title="class in org.apache.hadoop.yarn.server.nodemanager.recovery">NMStateStoreService.RecoveredContainerState</a>&nbsp;rcs)</code>
<div class="block">Populates auxiliary data structures used by the ContainerScheduler on
recovery.</div>
</td>
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<tr id="i10" class="altColor">
<td class="colFirst"><code>protected void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../../org/apache/hadoop/yarn/server/nodemanager/containermanager/scheduler/ContainerScheduler.html#scheduleContainer-org.apache.hadoop.yarn.server.nodemanager.containermanager.container.Container-">scheduleContainer</a></span>(<a href="../../../../../../../../org/apache/hadoop/yarn/server/nodemanager/containermanager/container/Container.html" title="interface in org.apache.hadoop.yarn.server.nodemanager.containermanager.container">Container</a>&nbsp;container)</code>&nbsp;</td>
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<tr id="i11" class="rowColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../../org/apache/hadoop/yarn/server/nodemanager/containermanager/scheduler/ContainerScheduler.html#serviceInit-org.apache.hadoop.conf.Configuration-">serviceInit</a></span>(org.apache.hadoop.conf.Configuration&nbsp;conf)</code>&nbsp;</td>
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<tr id="i12" class="altColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../../org/apache/hadoop/yarn/server/nodemanager/containermanager/scheduler/ContainerScheduler.html#setUsePauseEventForPreemption-boolean-">setUsePauseEventForPreemption</a></span>(boolean&nbsp;usePauseEventForPreemption)</code>&nbsp;</td>
</tr>
<tr id="i13" class="rowColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../../org/apache/hadoop/yarn/server/nodemanager/containermanager/scheduler/ContainerScheduler.html#updateQueuingLimit-org.apache.hadoop.yarn.server.api.records.ContainerQueuingLimit-">updateQueuingLimit</a></span>(org.apache.hadoop.yarn.server.api.records.ContainerQueuingLimit&nbsp;limit)</code>&nbsp;</td>
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<h3>Methods inherited from class&nbsp;org.apache.hadoop.service.AbstractService</h3>
<code>close, getBlockers, getConfig, getFailureCause, getFailureState, getLifecycleHistory, getName, getServiceState, getStartTime, init, isInState, noteFailure, putBlocker, registerGlobalListener, registerServiceListener, removeBlocker, serviceStart, serviceStop, setConfig, start, stop, toString, unregisterGlobalListener, unregisterServiceListener, waitForServiceToStop</code></li>
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<h4>ContainerScheduler</h4>
<pre>public&nbsp;ContainerScheduler(<a href="../../../../../../../../org/apache/hadoop/yarn/server/nodemanager/Context.html" title="interface in org.apache.hadoop.yarn.server.nodemanager">Context</a>&nbsp;context,
org.apache.hadoop.yarn.event.AsyncDispatcher&nbsp;dispatcher,
<a href="../../../../../../../../org/apache/hadoop/yarn/server/nodemanager/metrics/NodeManagerMetrics.html" title="class in org.apache.hadoop.yarn.server.nodemanager.metrics">NodeManagerMetrics</a>&nbsp;metrics)</pre>
<div class="block">Instantiate a Container Scheduler.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>context</code> - NodeManager Context.</dd>
<dd><code>dispatcher</code> - AsyncDispatcher.</dd>
<dd><code>metrics</code> - NodeManagerMetrics.</dd>
</dl>
</li>
</ul>
<a name="ContainerScheduler-org.apache.hadoop.yarn.server.nodemanager.Context-org.apache.hadoop.yarn.event.AsyncDispatcher-org.apache.hadoop.yarn.server.nodemanager.metrics.NodeManagerMetrics-int-">
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<h4>ContainerScheduler</h4>
<pre>public&nbsp;ContainerScheduler(<a href="../../../../../../../../org/apache/hadoop/yarn/server/nodemanager/Context.html" title="interface in org.apache.hadoop.yarn.server.nodemanager">Context</a>&nbsp;context,
org.apache.hadoop.yarn.event.AsyncDispatcher&nbsp;dispatcher,
<a href="../../../../../../../../org/apache/hadoop/yarn/server/nodemanager/metrics/NodeManagerMetrics.html" title="class in org.apache.hadoop.yarn.server.nodemanager.metrics">NodeManagerMetrics</a>&nbsp;metrics,
int&nbsp;qLength)</pre>
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<h4>serviceInit</h4>
<pre>public&nbsp;void&nbsp;serviceInit(org.apache.hadoop.conf.Configuration&nbsp;conf)
throws <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Exception.html?is-external=true" title="class or interface in java.lang">Exception</a></pre>
<dl>
<dt><span class="overrideSpecifyLabel">Overrides:</span></dt>
<dd><code>serviceInit</code>&nbsp;in class&nbsp;<code>org.apache.hadoop.service.AbstractService</code></dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Exception.html?is-external=true" title="class or interface in java.lang">Exception</a></code></dd>
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<h4>handle</h4>
<pre>public&nbsp;void&nbsp;handle(<a href="../../../../../../../../org/apache/hadoop/yarn/server/nodemanager/containermanager/scheduler/ContainerSchedulerEvent.html" title="class in org.apache.hadoop.yarn.server.nodemanager.containermanager.scheduler">ContainerSchedulerEvent</a>&nbsp;event)</pre>
<div class="block">Handle ContainerSchedulerEvents.</div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code>handle</code>&nbsp;in interface&nbsp;<code>org.apache.hadoop.yarn.event.EventHandler&lt;<a href="../../../../../../../../org/apache/hadoop/yarn/server/nodemanager/containermanager/scheduler/ContainerSchedulerEvent.html" title="class in org.apache.hadoop.yarn.server.nodemanager.containermanager.scheduler">ContainerSchedulerEvent</a>&gt;</code></dd>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>event</code> - ContainerSchedulerEvent.</dd>
</dl>
</li>
</ul>
<a name="recoverActiveContainer-org.apache.hadoop.yarn.server.nodemanager.containermanager.container.Container-org.apache.hadoop.yarn.server.nodemanager.recovery.NMStateStoreService.RecoveredContainerState-">
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<h4>recoverActiveContainer</h4>
<pre>public&nbsp;void&nbsp;recoverActiveContainer(<a href="../../../../../../../../org/apache/hadoop/yarn/server/nodemanager/containermanager/container/Container.html" title="interface in org.apache.hadoop.yarn.server.nodemanager.containermanager.container">Container</a>&nbsp;container,
<a href="../../../../../../../../org/apache/hadoop/yarn/server/nodemanager/recovery/NMStateStoreService.RecoveredContainerState.html" title="class in org.apache.hadoop.yarn.server.nodemanager.recovery">NMStateStoreService.RecoveredContainerState</a>&nbsp;rcs)</pre>
<div class="block">Populates auxiliary data structures used by the ContainerScheduler on
recovery.</div>
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<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>container</code> - container recovered</dd>
<dd><code>rcs</code> - Recovered Container status</dd>
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<pre>public&nbsp;int&nbsp;getNumQueuedContainers()</pre>
<div class="block">Return number of queued containers.</div>
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<dt><span class="returnLabel">Returns:</span></dt>
<dd>Number of queued containers.</dd>
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<h4>getOpportunisticQueueCapacity</h4>
<pre>public&nbsp;int&nbsp;getOpportunisticQueueCapacity()</pre>
<div class="block">Return the capacity of the queue for opportunistic containers
on this node.</div>
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<dt><span class="returnLabel">Returns:</span></dt>
<dd>queue capacity.</dd>
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<pre>public&nbsp;int&nbsp;getNumQueuedGuaranteedContainers()</pre>
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<pre>public&nbsp;int&nbsp;getNumQueuedOpportunisticContainers()</pre>
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<pre>public&nbsp;int&nbsp;getNumRunningContainers()</pre>
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<pre>public&nbsp;void&nbsp;setUsePauseEventForPreemption(boolean&nbsp;usePauseEventForPreemption)</pre>
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<pre>public&nbsp;org.apache.hadoop.yarn.server.api.records.OpportunisticContainersStatus&nbsp;getOpportunisticContainersStatus()</pre>
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<pre>protected&nbsp;void&nbsp;scheduleContainer(<a href="../../../../../../../../org/apache/hadoop/yarn/server/nodemanager/containermanager/container/Container.html" title="interface in org.apache.hadoop.yarn.server.nodemanager.containermanager.container">Container</a>&nbsp;container)</pre>
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<pre>public&nbsp;void&nbsp;updateQueuingLimit(org.apache.hadoop.yarn.server.api.records.ContainerQueuingLimit&nbsp;limit)</pre>
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<pre>public&nbsp;<a href="../../../../../../../../org/apache/hadoop/yarn/server/nodemanager/containermanager/monitor/ContainersMonitor.html" title="interface in org.apache.hadoop.yarn.server.nodemanager.containermanager.monitor">ContainersMonitor</a>&nbsp;getContainersMonitor()</pre>
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<pre>public&nbsp;org.apache.hadoop.yarn.api.records.ResourceUtilization&nbsp;getCurrentUtilization()</pre>
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