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apache / hadoop-site / 952d547359cafef280f0a0324055741b2ed55be1 / . / content / docs / r3.3.1 / hadoop-yarn / hadoop-yarn-server / hadoop-yarn-server-nodemanager / apidocs / org / apache / hadoop / yarn / server / nodemanager / containermanager / linux / resources / CGroupsResourceCalculator.html
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<div class="subTitle">org.apache.hadoop.yarn.server.nodemanager.containermanager.linux.resources</div>
<h2 title="Class CGroupsResourceCalculator" class="title">Class CGroupsResourceCalculator</h2>
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<li>org.apache.hadoop.conf.Configured</li>
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<ul class="inheritance">
<li>org.apache.hadoop.yarn.util.ResourceCalculatorProcessTree</li>
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<ul class="inheritance">
<li>org.apache.hadoop.yarn.server.nodemanager.containermanager.linux.resources.CGroupsResourceCalculator</li>
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<pre>public class <span class="typeNameLabel">CGroupsResourceCalculator</span>
extends org.apache.hadoop.yarn.util.ResourceCalculatorProcessTree</pre>
<div class="block">A cgroups file-system based Resource calculator without the process tree
features.
CGroups has its limitations. It can only be enabled, if both CPU and memory
cgroups are enabled with yarn.nodemanager.resource.cpu.enabled and
yarn.nodemanager.resource.memory.enabled respectively. This means that
memory limits are enforced by default. You can turn this off and keep
memory reporting only with yarn.nodemanager.resource.memory.enforced.
Another limitation is virtual memory measurement. CGroups does not have the
ability to measure virtual memory usage. This includes memory reserved but
not used. CGroups measures used memory as sa sum of
physical memory and swap usage. This will be returned in the virtual
memory counters.
If the real virtual memory is required please use the legacy procfs based
resource calculator or CombinedResourceCalculator.</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/CGroupsResourceCalculator.html#LOG">LOG</a></span></code>&nbsp;</td>
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<code>UNAVAILABLE</code></li>
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<td class="colOne"><code><span class="memberNameLink"><a href="../../../../../../../../../org/apache/hadoop/yarn/server/nodemanager/containermanager/linux/resources/CGroupsResourceCalculator.html#CGroupsResourceCalculator--">CGroupsResourceCalculator</a></span>()</code>
<div class="block">Create resource calculator for all Yarn containers.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colOne"><code><span class="memberNameLink"><a href="../../../../../../../../../org/apache/hadoop/yarn/server/nodemanager/containermanager/linux/resources/CGroupsResourceCalculator.html#CGroupsResourceCalculator-java.lang.String-">CGroupsResourceCalculator</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;pid)</code>
<div class="block">Create resource calculator for the container that has the specified pid.</div>
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<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../../../org/apache/hadoop/yarn/server/nodemanager/containermanager/linux/resources/CGroupsResourceCalculator.html#checkPidPgrpidForMatch--">checkPidPgrpidForMatch</a></span>()</code>&nbsp;</td>
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<td class="colFirst"><code>float</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../../../org/apache/hadoop/yarn/server/nodemanager/containermanager/linux/resources/CGroupsResourceCalculator.html#getCpuUsagePercent--">getCpuUsagePercent</a></span>()</code>&nbsp;</td>
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<td class="colFirst"><code>long</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../../../org/apache/hadoop/yarn/server/nodemanager/containermanager/linux/resources/CGroupsResourceCalculator.html#getCumulativeCpuTime--">getCumulativeCpuTime</a></span>()</code>&nbsp;</td>
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<tr id="i3" class="rowColor">
<td class="colFirst"><code><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></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../../../org/apache/hadoop/yarn/server/nodemanager/containermanager/linux/resources/CGroupsResourceCalculator.html#getProcessTreeDump--">getProcessTreeDump</a></span>()</code>&nbsp;</td>
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<tr id="i4" class="altColor">
<td class="colFirst"><code>long</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../../../org/apache/hadoop/yarn/server/nodemanager/containermanager/linux/resources/CGroupsResourceCalculator.html#getRssMemorySize-int-">getRssMemorySize</a></span>(int&nbsp;olderThanAge)</code>&nbsp;</td>
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<tr id="i5" class="rowColor">
<td class="colFirst"><code>long</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../../../org/apache/hadoop/yarn/server/nodemanager/containermanager/linux/resources/CGroupsResourceCalculator.html#getVirtualMemorySize-int-">getVirtualMemorySize</a></span>(int&nbsp;olderThanAge)</code>&nbsp;</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/hadoop/yarn/server/nodemanager/containermanager/linux/resources/CGroupsResourceCalculator.html#initialize--">initialize</a></span>()</code>&nbsp;</td>
</tr>
<tr id="i7" class="rowColor">
<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/CGroupsResourceCalculator.html#isAvailable--">isAvailable</a></span>()</code>
<div class="block">Checks if the CGroupsResourceCalculator is available on this system.</div>
</td>
</tr>
<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/linux/resources/CGroupsResourceCalculator.html#updateProcessTree--">updateProcessTree</a></span>()</code>&nbsp;</td>
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<h3>Methods inherited from class&nbsp;org.apache.hadoop.yarn.util.ResourceCalculatorProcessTree</h3>
<code>getResourceCalculatorProcessTree, getRssMemorySize, getVirtualMemorySize</code></li>
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<pre>protected static final&nbsp;org.slf4j.Logger LOG</pre>
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<h4>CGroupsResourceCalculator</h4>
<pre>public&nbsp;CGroupsResourceCalculator()
throws org.apache.hadoop.yarn.exceptions.YarnException</pre>
<div class="block">Create resource calculator for all Yarn containers.</div>
<dl>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code>org.apache.hadoop.yarn.exceptions.YarnException</code></dd>
</dl>
</li>
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<h4>CGroupsResourceCalculator</h4>
<pre>public&nbsp;CGroupsResourceCalculator(<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;pid)</pre>
<div class="block">Create resource calculator for the container that has the specified pid.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>pid</code> - A pid from the cgroup or null for all containers</dd>
</dl>
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<h4>initialize</h4>
<pre>public&nbsp;void&nbsp;initialize()
throws org.apache.hadoop.yarn.exceptions.YarnException</pre>
<dl>
<dt><span class="overrideSpecifyLabel">Overrides:</span></dt>
<dd><code>initialize</code>&nbsp;in class&nbsp;<code>org.apache.hadoop.yarn.util.ResourceCalculatorProcessTree</code></dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code>org.apache.hadoop.yarn.exceptions.YarnException</code></dd>
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<h4>getCpuUsagePercent</h4>
<pre>public&nbsp;float&nbsp;getCpuUsagePercent()</pre>
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<dd><code>getCpuUsagePercent</code>&nbsp;in class&nbsp;<code>org.apache.hadoop.yarn.util.ResourceCalculatorProcessTree</code></dd>
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<h4>getCumulativeCpuTime</h4>
<pre>public&nbsp;long&nbsp;getCumulativeCpuTime()</pre>
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<dd><code>getCumulativeCpuTime</code>&nbsp;in class&nbsp;<code>org.apache.hadoop.yarn.util.ResourceCalculatorProcessTree</code></dd>
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<h4>getRssMemorySize</h4>
<pre>public&nbsp;long&nbsp;getRssMemorySize(int&nbsp;olderThanAge)</pre>
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<dd><code>getRssMemorySize</code>&nbsp;in class&nbsp;<code>org.apache.hadoop.yarn.util.ResourceCalculatorProcessTree</code></dd>
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<h4>getVirtualMemorySize</h4>
<pre>public&nbsp;long&nbsp;getVirtualMemorySize(int&nbsp;olderThanAge)</pre>
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<dd><code>getVirtualMemorySize</code>&nbsp;in class&nbsp;<code>org.apache.hadoop.yarn.util.ResourceCalculatorProcessTree</code></dd>
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<pre>public&nbsp;void&nbsp;updateProcessTree()</pre>
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<dd><code>updateProcessTree</code>&nbsp;in class&nbsp;<code>org.apache.hadoop.yarn.util.ResourceCalculatorProcessTree</code></dd>
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<h4>getProcessTreeDump</h4>
<pre>public&nbsp;<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;getProcessTreeDump()</pre>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code>getProcessTreeDump</code>&nbsp;in class&nbsp;<code>org.apache.hadoop.yarn.util.ResourceCalculatorProcessTree</code></dd>
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<a name="checkPidPgrpidForMatch--">
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<h4>checkPidPgrpidForMatch</h4>
<pre>public&nbsp;boolean&nbsp;checkPidPgrpidForMatch()</pre>
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<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code>checkPidPgrpidForMatch</code>&nbsp;in class&nbsp;<code>org.apache.hadoop.yarn.util.ResourceCalculatorProcessTree</code></dd>
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<h4>isAvailable</h4>
<pre>public static&nbsp;boolean&nbsp;isAvailable()</pre>
<div class="block">Checks if the CGroupsResourceCalculator is available on this system.
This assumes that Linux container executor is already initialized.</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>true if CGroupsResourceCalculator is available. False otherwise.</dd>
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