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<h2 title="Class MutableStat" class="title">Class MutableStat</h2>
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<li>org.apache.hadoop.metrics2.lib.MutableStat</li>
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<dd><a href="../../../../../org/apache/hadoop/metrics2/lib/MutableRate.html" title="class in org.apache.hadoop.metrics2.lib">MutableRate</a></dd>
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<pre>@InterfaceAudience.Public
@InterfaceStability.Evolving
public class <span class="typeNameLabel">MutableStat</span>
extends <a href="../../../../../org/apache/hadoop/metrics2/lib/MutableMetric.html" title="class in org.apache.hadoop.metrics2.lib">MutableMetric</a></pre>
<div class="block">A mutable metric with stats.
Useful for keeping throughput/latency stats.</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/hadoop/metrics2/lib/MutableStat.html#MutableStat-java.lang.String-java.lang.String-java.lang.String-java.lang.String-">MutableStat</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;name,
<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;description,
<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;sampleName,
<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;valueName)</code>
<div class="block">Construct a snapshot stat metric with extended stat off by default</div>
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<td class="colOne"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/metrics2/lib/MutableStat.html#MutableStat-java.lang.String-java.lang.String-java.lang.String-java.lang.String-boolean-">MutableStat</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;name,
<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;description,
<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;sampleName,
<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;valueName,
boolean&nbsp;extended)</code>
<div class="block">Construct a sample statistics metric</div>
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<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/metrics2/lib/MutableStat.html#add-long-">add</a></span>(long&nbsp;value)</code>
<div class="block">Add a snapshot to the metric.</div>
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<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/metrics2/lib/MutableStat.html#add-long-long-">add</a></span>(long&nbsp;numSamples,
long&nbsp;sum)</code>
<div class="block">Add a number of samples and their sum to the running stat
Note that although use of this method will preserve accurate mean values,
large values for numSamples may result in inaccurate variance values due
to the use of a single step of the Welford method for variance calculation.</div>
</td>
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<td class="colFirst"><code>long</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/metrics2/lib/MutableStat.html#getSnapshotTimeStamp--">getSnapshotTimeStamp</a></span>()</code>
<div class="block">Return the SampleStat snapshot timestamp</div>
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<tr id="i3" class="rowColor">
<td class="colFirst"><code>org.apache.hadoop.metrics2.util.SampleStat</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/metrics2/lib/MutableStat.html#lastStat--">lastStat</a></span>()</code>
<div class="block">Return a SampleStat object that supports
calls like StdDev and Mean.</div>
</td>
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<tr id="i4" class="altColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/metrics2/lib/MutableStat.html#resetMinMax--">resetMinMax</a></span>()</code>
<div class="block">Reset the all time min max of the metric</div>
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<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/metrics2/lib/MutableStat.html#setExtended-boolean-">setExtended</a></span>(boolean&nbsp;extended)</code>
<div class="block">Set whether to display the extended stats (stdev, min/max etc.) or not</div>
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<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/metrics2/lib/MutableStat.html#setUpdateTimeStamp-boolean-">setUpdateTimeStamp</a></span>(boolean&nbsp;updateTimeStamp)</code>
<div class="block">Set whether to update the snapshot time or not.</div>
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<tr id="i7" class="rowColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/metrics2/lib/MutableStat.html#snapshot-org.apache.hadoop.metrics2.MetricsRecordBuilder-boolean-">snapshot</a></span>(<a href="../../../../../org/apache/hadoop/metrics2/MetricsRecordBuilder.html" title="class in org.apache.hadoop.metrics2">MetricsRecordBuilder</a>&nbsp;builder,
boolean&nbsp;all)</code>
<div class="block">Get a snapshot of the metric</div>
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<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/metrics2/lib/MutableStat.html#toString--">toString</a></span>()</code>&nbsp;</td>
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<code><a href="../../../../../org/apache/hadoop/metrics2/lib/MutableMetric.html#changed--">changed</a>, <a href="../../../../../org/apache/hadoop/metrics2/lib/MutableMetric.html#clearChanged--">clearChanged</a>, <a href="../../../../../org/apache/hadoop/metrics2/lib/MutableMetric.html#setChanged--">setChanged</a>, <a href="../../../../../org/apache/hadoop/metrics2/lib/MutableMetric.html#snapshot-org.apache.hadoop.metrics2.MetricsRecordBuilder-">snapshot</a></code></li>
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<code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#clone--" title="class or interface in java.lang">clone</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#equals-java.lang.Object-" title="class or interface in java.lang">equals</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#finalize--" title="class or interface in java.lang">finalize</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#getClass--" title="class or interface in java.lang">getClass</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#hashCode--" title="class or interface in java.lang">hashCode</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#notify--" title="class or interface in java.lang">notify</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#notifyAll--" title="class or interface in java.lang">notifyAll</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#wait--" title="class or interface in java.lang">wait</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#wait-long-" title="class or interface in java.lang">wait</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#wait-long-int-" title="class or interface in java.lang">wait</a></code></li>
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<h4>MutableStat</h4>
<pre>public&nbsp;MutableStat(<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;name,
<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;description,
<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;sampleName,
<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;valueName,
boolean&nbsp;extended)</pre>
<div class="block">Construct a sample statistics metric</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>name</code> - of the metric</dd>
<dd><code>description</code> - of the metric</dd>
<dd><code>sampleName</code> - of the metric (e.g. "Ops")</dd>
<dd><code>valueName</code> - of the metric (e.g. "Time", "Latency")</dd>
<dd><code>extended</code> - create extended stats (stdev, min/max etc.) by default.</dd>
</dl>
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<h4>MutableStat</h4>
<pre>public&nbsp;MutableStat(<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;name,
<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;description,
<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;sampleName,
<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;valueName)</pre>
<div class="block">Construct a snapshot stat metric with extended stat off by default</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>name</code> - of the metric</dd>
<dd><code>description</code> - of the metric</dd>
<dd><code>sampleName</code> - of the metric (e.g. "Ops")</dd>
<dd><code>valueName</code> - of the metric (e.g. "Time", "Latency")</dd>
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<pre>public&nbsp;void&nbsp;setExtended(boolean&nbsp;extended)</pre>
<div class="block">Set whether to display the extended stats (stdev, min/max etc.) or not</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>extended</code> - enable/disable displaying extended stats</dd>
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<pre>public&nbsp;void&nbsp;setUpdateTimeStamp(boolean&nbsp;updateTimeStamp)</pre>
<div class="block">Set whether to update the snapshot time or not.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>updateTimeStamp</code> - enable update stats snapshot timestamp</dd>
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<h4>add</h4>
<pre>public&nbsp;void&nbsp;add(long&nbsp;numSamples,
long&nbsp;sum)</pre>
<div class="block">Add a number of samples and their sum to the running stat
Note that although use of this method will preserve accurate mean values,
large values for numSamples may result in inaccurate variance values due
to the use of a single step of the Welford method for variance calculation.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>numSamples</code> - number of samples</dd>
<dd><code>sum</code> - of the samples</dd>
</dl>
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<pre>public&nbsp;void&nbsp;add(long&nbsp;value)</pre>
<div class="block">Add a snapshot to the metric.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>value</code> - of the metric</dd>
</dl>
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<h4>snapshot</h4>
<pre>public&nbsp;void&nbsp;snapshot(<a href="../../../../../org/apache/hadoop/metrics2/MetricsRecordBuilder.html" title="class in org.apache.hadoop.metrics2">MetricsRecordBuilder</a>&nbsp;builder,
boolean&nbsp;all)</pre>
<div class="block"><span class="descfrmTypeLabel">Description copied from class:&nbsp;<code><a href="../../../../../org/apache/hadoop/metrics2/lib/MutableMetric.html#snapshot-org.apache.hadoop.metrics2.MetricsRecordBuilder-boolean-">MutableMetric</a></code></span></div>
<div class="block">Get a snapshot of the metric</div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="../../../../../org/apache/hadoop/metrics2/lib/MutableMetric.html#snapshot-org.apache.hadoop.metrics2.MetricsRecordBuilder-boolean-">snapshot</a></code>&nbsp;in class&nbsp;<code><a href="../../../../../org/apache/hadoop/metrics2/lib/MutableMetric.html" title="class in org.apache.hadoop.metrics2.lib">MutableMetric</a></code></dd>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>builder</code> - the metrics record builder</dd>
<dd><code>all</code> - if true, snapshot unchanged metrics as well</dd>
</dl>
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<h4>lastStat</h4>
<pre>public&nbsp;org.apache.hadoop.metrics2.util.SampleStat&nbsp;lastStat()</pre>
<div class="block">Return a SampleStat object that supports
calls like StdDev and Mean.</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>SampleStat</dd>
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<pre>public&nbsp;void&nbsp;resetMinMax()</pre>
<div class="block">Reset the all time min max of the metric</div>
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<h4>getSnapshotTimeStamp</h4>
<pre>public&nbsp;long&nbsp;getSnapshotTimeStamp()</pre>
<div class="block">Return the SampleStat snapshot timestamp</div>
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<h4>toString</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;toString()</pre>
<dl>
<dt><span class="overrideSpecifyLabel">Overrides:</span></dt>
<dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#toString--" title="class or interface in java.lang">toString</a></code>&nbsp;in class&nbsp;<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></dd>
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