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| <div class="subTitle">org.apache.hadoop.yarn.server.nodemanager.containermanager.linux.resources</div> |
| <h2 title="Class CGroupElasticMemoryController" class="title">Class CGroupElasticMemoryController</h2> |
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| <li>org.apache.hadoop.yarn.server.nodemanager.containermanager.linux.resources.CGroupElasticMemoryController</li> |
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| <pre>public class <span class="typeNameLabel">CGroupElasticMemoryController</span> |
| extends <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Thread.html?is-external=true" title="class or interface in java.lang">Thread</a></pre> |
| <div class="block">This thread controls memory usage using cgroups. It listens to out of memory |
| events of all the containers together, and if we go over the limit picks |
| a container to kill. The algorithm that picks the container is a plugin.</div> |
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| <td class="colFirst"><code>protected static org.slf4j.Logger</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../../../org/apache/hadoop/yarn/server/nodemanager/containermanager/linux/resources/CGroupElasticMemoryController.html#LOG">LOG</a></span></code> </td> |
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| <td class="colOne"><code><span class="memberNameLink"><a href="../../../../../../../../../org/apache/hadoop/yarn/server/nodemanager/containermanager/linux/resources/CGroupElasticMemoryController.html#CGroupElasticMemoryController-org.apache.hadoop.conf.Configuration-org.apache.hadoop.yarn.server.nodemanager.Context-org.apache.hadoop.yarn.server.nodemanager.containermanager.linux.resources.CGroupsHandler-boolean-boolean-long-">CGroupElasticMemoryController</a></span>(org.apache.hadoop.conf.Configuration conf, |
| <a href="../../../../../../../../../org/apache/hadoop/yarn/server/nodemanager/Context.html" title="interface in org.apache.hadoop.yarn.server.nodemanager">Context</a> context, |
| <a href="../../../../../../../../../org/apache/hadoop/yarn/server/nodemanager/containermanager/linux/resources/CGroupsHandler.html" title="interface in org.apache.hadoop.yarn.server.nodemanager.containermanager.linux.resources">CGroupsHandler</a> cgroups, |
| boolean controlPhysicalMemory, |
| boolean controlVirtualMemory, |
| long limit)</code> |
| <div class="block">Default constructor.</div> |
| </td> |
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| <td class="colFirst"><code>static boolean</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../../../org/apache/hadoop/yarn/server/nodemanager/containermanager/linux/resources/CGroupElasticMemoryController.html#isAvailable--">isAvailable</a></span>()</code> |
| <div class="block">Checks if the CGroupElasticMemoryController is available on this system.</div> |
| </td> |
| </tr> |
| <tr id="i1" 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/linux/resources/CGroupElasticMemoryController.html#run--">run</a></span>()</code> |
| <div class="block">Main OOM listening thread.</div> |
| </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/hadoop/yarn/server/nodemanager/containermanager/linux/resources/CGroupElasticMemoryController.html#stopListening--">stopListening</a></span>()</code> |
| <div class="block">Stop listening to the cgroup.</div> |
| </td> |
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| <a name="LOG"> |
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| <h4>LOG</h4> |
| <pre>protected static final org.slf4j.Logger LOG</pre> |
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| <h3>Constructor Detail</h3> |
| <a name="CGroupElasticMemoryController-org.apache.hadoop.conf.Configuration-org.apache.hadoop.yarn.server.nodemanager.Context-org.apache.hadoop.yarn.server.nodemanager.containermanager.linux.resources.CGroupsHandler-boolean-boolean-long-"> |
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| <h4>CGroupElasticMemoryController</h4> |
| <pre>public CGroupElasticMemoryController(org.apache.hadoop.conf.Configuration conf, |
| <a href="../../../../../../../../../org/apache/hadoop/yarn/server/nodemanager/Context.html" title="interface in org.apache.hadoop.yarn.server.nodemanager">Context</a> context, |
| <a href="../../../../../../../../../org/apache/hadoop/yarn/server/nodemanager/containermanager/linux/resources/CGroupsHandler.html" title="interface in org.apache.hadoop.yarn.server.nodemanager.containermanager.linux.resources">CGroupsHandler</a> cgroups, |
| boolean controlPhysicalMemory, |
| boolean controlVirtualMemory, |
| long limit) |
| throws org.apache.hadoop.yarn.exceptions.YarnException</pre> |
| <div class="block">Default constructor.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>conf</code> - Yarn configuration to use</dd> |
| <dd><code>context</code> - Node manager context to out of memory handler</dd> |
| <dd><code>cgroups</code> - Cgroups handler configured</dd> |
| <dd><code>controlPhysicalMemory</code> - Whether to listen to physical memory OOM</dd> |
| <dd><code>controlVirtualMemory</code> - Whether to listen to virtual memory OOM</dd> |
| <dd><code>limit</code> - memory limit in bytes</dd> |
| <dt><span class="throwsLabel">Throws:</span></dt> |
| <dd><code>org.apache.hadoop.yarn.exceptions.YarnException</code> - Could not instantiate class</dd> |
| </dl> |
| </li> |
| </ul> |
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| <h4>stopListening</h4> |
| <pre>public void stopListening()</pre> |
| <div class="block">Stop listening to the cgroup.</div> |
| </li> |
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| <a name="isAvailable--"> |
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| <h4>isAvailable</h4> |
| <pre>public static boolean isAvailable()</pre> |
| <div class="block">Checks if the CGroupElasticMemoryController is available on this system. |
| This assumes that Linux container executor is already initialized. |
| We need to have CGroups enabled.</div> |
| <dl> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>True if CGroupElasticMemoryController is available. |
| False otherwise.</dd> |
| </dl> |
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| <h4>run</h4> |
| <pre>public void run()</pre> |
| <div class="block">Main OOM listening thread. It uses an external process to listen to |
| Linux events. The external process does not need to run as root, so |
| it is not related to container-executor. We do not use JNI for security |
| reasons.</div> |
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