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<div class="subTitle">org.apache.hadoop.metrics2</div>
<h2 title="Class MetricsSystem" class="title">Class MetricsSystem</h2>
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<li>org.apache.hadoop.metrics2.MetricsSystem</li>
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<pre>@InterfaceAudience.Public
@InterfaceStability.Evolving
public abstract class <span class="typeNameLabel">MetricsSystem</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="../../../../org/apache/hadoop/metrics2/MetricsSystemMXBean.html" title="interface in org.apache.hadoop.metrics2">MetricsSystemMXBean</a></pre>
<div class="block">The metrics system interface.
The following components are used for metrics.
<ul>
<li><a href="../../../../org/apache/hadoop/metrics2/MetricsSource.html" title="interface in org.apache.hadoop.metrics2"><code>MetricsSource</code></a> generate and update metrics information.</li>
<li><a href="../../../../org/apache/hadoop/metrics2/MetricsSink.html" title="interface in org.apache.hadoop.metrics2"><code>MetricsSink</code></a> consume the metrics information</li>
</ul>
<a href="../../../../org/apache/hadoop/metrics2/MetricsSource.html" title="interface in org.apache.hadoop.metrics2"><code>MetricsSource</code></a> and <a href="../../../../org/apache/hadoop/metrics2/MetricsSink.html" title="interface in org.apache.hadoop.metrics2"><code>MetricsSink</code></a> register with the metrics
system. Implementations of <a href="../../../../org/apache/hadoop/metrics2/MetricsSystem.html" title="class in org.apache.hadoop.metrics2"><code>MetricsSystem</code></a> polls the
<a href="../../../../org/apache/hadoop/metrics2/MetricsSource.html" title="interface in org.apache.hadoop.metrics2"><code>MetricsSource</code></a>s periodically and pass the <a href="../../../../org/apache/hadoop/metrics2/MetricsRecord.html" title="interface in org.apache.hadoop.metrics2"><code>MetricsRecord</code></a>s to
<a href="../../../../org/apache/hadoop/metrics2/MetricsSink.html" title="interface in org.apache.hadoop.metrics2"><code>MetricsSink</code></a>.</div>
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<td class="colOne"><code><span class="memberNameLink"><a href="../../../../org/apache/hadoop/metrics2/MetricsSystem.html#MetricsSystem--">MetricsSystem</a></span>()</code>&nbsp;</td>
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<td class="colFirst"><code>abstract void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/hadoop/metrics2/MetricsSystem.html#publishMetricsNow--">publishMetricsNow</a></span>()</code>
<div class="block">Requests an immediate publish of all metrics from sources to sinks.</div>
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<td class="colFirst"><code>abstract void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/hadoop/metrics2/MetricsSystem.html#register-org.apache.hadoop.metrics2.MetricsSystem.Callback-">register</a></span>(org.apache.hadoop.metrics2.MetricsSystem.Callback&nbsp;callback)</code>
<div class="block">Register a callback interface for JMX events</div>
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<td class="colFirst"><code>abstract &lt;T&gt;&nbsp;T</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/hadoop/metrics2/MetricsSystem.html#register-java.lang.String-java.lang.String-T-">register</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;desc,
T&nbsp;source)</code>
<div class="block">Register a metrics source</div>
</td>
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<tr id="i3" class="rowColor">
<td class="colFirst"><code>abstract &lt;T extends <a href="../../../../org/apache/hadoop/metrics2/MetricsSink.html" title="interface in org.apache.hadoop.metrics2">MetricsSink</a>&gt;<br>T</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/hadoop/metrics2/MetricsSystem.html#register-java.lang.String-java.lang.String-T-">register</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;desc,
T&nbsp;sink)</code>
<div class="block">Register a metrics sink</div>
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<tr id="i4" class="altColor">
<td class="colFirst"><code>&lt;T&gt;&nbsp;T</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/hadoop/metrics2/MetricsSystem.html#register-T-">register</a></span>(T&nbsp;source)</code>
<div class="block">Register a metrics source (deriving name and description from the object)</div>
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<td class="colFirst"><code>abstract boolean</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/hadoop/metrics2/MetricsSystem.html#shutdown--">shutdown</a></span>()</code>
<div class="block">Shutdown the metrics system completely (usually during server shutdown.)
The MetricsSystemMXBean will be unregistered.</div>
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<tr id="i6" class="altColor">
<td class="colFirst"><code>abstract void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/hadoop/metrics2/MetricsSystem.html#unregisterSource-java.lang.String-">unregisterSource</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)</code>
<div class="block">Unregister a metrics source</div>
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<code><a href="../../../../org/apache/hadoop/metrics2/MetricsSystemMXBean.html#currentConfig--">currentConfig</a>, <a href="../../../../org/apache/hadoop/metrics2/MetricsSystemMXBean.html#start--">start</a>, <a href="../../../../org/apache/hadoop/metrics2/MetricsSystemMXBean.html#startMetricsMBeans--">startMetricsMBeans</a>, <a href="../../../../org/apache/hadoop/metrics2/MetricsSystemMXBean.html#stop--">stop</a>, <a href="../../../../org/apache/hadoop/metrics2/MetricsSystemMXBean.html#stopMetricsMBeans--">stopMetricsMBeans</a></code></li>
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<h4>MetricsSystem</h4>
<pre>public&nbsp;MetricsSystem()</pre>
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<h4>register</h4>
<pre>public abstract&nbsp;&lt;T&gt;&nbsp;T&nbsp;register(<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;desc,
T&nbsp;source)</pre>
<div class="block">Register a metrics source</div>
<dl>
<dt><span class="paramLabel">Type Parameters:</span></dt>
<dd><code>T</code> - the actual type of the source object</dd>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>source</code> - object to register</dd>
<dd><code>name</code> - of the source. Must be unique or null (then extracted from
the annotations of the source object.)</dd>
<dd><code>desc</code> - the description of the source (or null. See above.)</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>the source object</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="../../../../org/apache/hadoop/metrics2/MetricsException.html" title="class in org.apache.hadoop.metrics2">MetricsException</a></code></dd>
</dl>
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<h4>unregisterSource</h4>
<pre>public abstract&nbsp;void&nbsp;unregisterSource(<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)</pre>
<div class="block">Unregister a metrics source</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>name</code> - of the source. This is the name you use to call register()</dd>
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<h4>register</h4>
<pre>public&nbsp;&lt;T&gt;&nbsp;T&nbsp;register(T&nbsp;source)</pre>
<div class="block">Register a metrics source (deriving name and description from the object)</div>
<dl>
<dt><span class="paramLabel">Type Parameters:</span></dt>
<dd><code>T</code> - the actual type of the source object</dd>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>source</code> - object to register</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>the source object</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="../../../../org/apache/hadoop/metrics2/MetricsException.html" title="class in org.apache.hadoop.metrics2">MetricsException</a></code></dd>
</dl>
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<pre>public abstract&nbsp;&lt;T extends <a href="../../../../org/apache/hadoop/metrics2/MetricsSink.html" title="interface in org.apache.hadoop.metrics2">MetricsSink</a>&gt;&nbsp;T&nbsp;register(<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;desc,
T&nbsp;sink)</pre>
<div class="block">Register a metrics sink</div>
<dl>
<dt><span class="paramLabel">Type Parameters:</span></dt>
<dd><code>T</code> - the type of the sink</dd>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>sink</code> - to register</dd>
<dd><code>name</code> - of the sink. Must be unique.</dd>
<dd><code>desc</code> - the description of the sink</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>the sink</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="../../../../org/apache/hadoop/metrics2/MetricsException.html" title="class in org.apache.hadoop.metrics2">MetricsException</a></code></dd>
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<h4>register</h4>
<pre>public abstract&nbsp;void&nbsp;register(org.apache.hadoop.metrics2.MetricsSystem.Callback&nbsp;callback)</pre>
<div class="block">Register a callback interface for JMX events</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>callback</code> - the callback object implementing the MBean interface.</dd>
</dl>
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<h4>publishMetricsNow</h4>
<pre>public abstract&nbsp;void&nbsp;publishMetricsNow()</pre>
<div class="block">Requests an immediate publish of all metrics from sources to sinks.
This is a "soft" request: the expectation is that a best effort will be
done to synchronously snapshot the metrics from all the sources and put
them in all the sinks (including flushing the sinks) before returning to
the caller. If this can't be accomplished in reasonable time it's OK to
return to the caller before everything is done.</div>
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<h4>shutdown</h4>
<pre>public abstract&nbsp;boolean&nbsp;shutdown()</pre>
<div class="block">Shutdown the metrics system completely (usually during server shutdown.)
The MetricsSystemMXBean will be unregistered.</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>true if shutdown completed</dd>
</dl>
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