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| <div class="subTitle">org.apache.hadoop.yarn.server.nodemanager.containermanager.linux.resources</div> |
| <h2 title="Class DefaultOOMHandler" class="title">Class DefaultOOMHandler</h2> |
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| <li>org.apache.hadoop.yarn.server.nodemanager.containermanager.linux.resources.DefaultOOMHandler</li> |
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| <pre>@InterfaceAudience.Public |
| @InterfaceStability.Evolving |
| public class <span class="typeNameLabel">DefaultOOMHandler</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="https://docs.oracle.com/javase/8/docs/api/java/lang/Runnable.html?is-external=true" title="class or interface in java.lang">Runnable</a></pre> |
| <div class="block">A very basic OOM handler implementation. |
| See the javadoc on the run() method for details.</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/DefaultOOMHandler.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/DefaultOOMHandler.html#DefaultOOMHandler-org.apache.hadoop.yarn.server.nodemanager.Context-boolean-">DefaultOOMHandler</a></span>(<a href="../../../../../../../../../org/apache/hadoop/yarn/server/nodemanager/Context.html" title="interface in org.apache.hadoop.yarn.server.nodemanager">Context</a> context, |
| boolean enforceVirtualMemory)</code> |
| <div class="block">Create an OOM handler.</div> |
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| <td class="colFirst"><code>protected <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></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../../../org/apache/hadoop/yarn/server/nodemanager/containermanager/linux/resources/DefaultOOMHandler.html#getCGroupsHandler--">getCGroupsHandler</a></span>()</code> </td> |
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| <tr id="i1" class="rowColor"> |
| <td class="colFirst"><code>protected boolean</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../../../org/apache/hadoop/yarn/server/nodemanager/containermanager/linux/resources/DefaultOOMHandler.html#killContainer--">killContainer</a></span>()</code> |
| <div class="block">Choose and kill a container in case of OOM.</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/DefaultOOMHandler.html#run--">run</a></span>()</code> |
| <div class="block">It is called when the node is under an OOM condition.</div> |
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| <h4>LOG</h4> |
| <pre>protected static final org.slf4j.Logger LOG</pre> |
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| <h4>DefaultOOMHandler</h4> |
| <pre>public DefaultOOMHandler(<a href="../../../../../../../../../org/apache/hadoop/yarn/server/nodemanager/Context.html" title="interface in org.apache.hadoop.yarn.server.nodemanager">Context</a> context, |
| boolean enforceVirtualMemory)</pre> |
| <div class="block">Create an OOM handler. |
| This has to be public to be able to construct through reflection.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>context</code> - node manager context to work with</dd> |
| <dd><code>enforceVirtualMemory</code> - true if virtual memory needs to be checked, |
| false if physical memory needs to be checked instead</dd> |
| </dl> |
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| <a name="getCGroupsHandler--"> |
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| <h4>getCGroupsHandler</h4> |
| <pre>protected <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> getCGroupsHandler()</pre> |
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| <h4>run</h4> |
| <pre>public void run()</pre> |
| <div class="block">It is called when the node is under an OOM condition. All processes in |
| all sub-cgroups are suspended. We need to act fast, so that we do not |
| affect the overall system utilization. In general we try to find a |
| newly launched container that exceeded its limits. The justification is |
| cost, since probably this is the one that has accumulated the least |
| amount of uncommitted data so far. OPPORTUNISTIC containers are always |
| killed before any GUARANTEED containers are considered. We continue the |
| process until the OOM is resolved.</div> |
| <dl> |
| <dt><span class="overrideSpecifyLabel">Specified by:</span></dt> |
| <dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Runnable.html?is-external=true#run--" title="class or interface in java.lang">run</a></code> in interface <code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Runnable.html?is-external=true" title="class or interface in java.lang">Runnable</a></code></dd> |
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| <h4>killContainer</h4> |
| <pre>protected boolean killContainer()</pre> |
| <div class="block">Choose and kill a container in case of OOM. We try to find the most |
| recently launched OPPORTUNISTIC container that exceeds its limit |
| and fall back to the most recently launched OPPORTUNISTIC container |
| If there is no such container found, we choose to kill a GUARANTEED |
| container in the same way.</div> |
| <dl> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>true if a container is killed, false otherwise</dd> |
| </dl> |
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