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<p>@InterfaceAudience.Public
@InterfaceStability.Evolving
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<h1 title="Package" class="title">Package&nbsp;org.apache.hadoop.metrics2.lib</h1>
<div class="docSummary">
<div class="block">A collection of library classes for implementing metrics sources</div>
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<p>See:&nbsp;<a href="#package.description">Description</a></p>
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<th class="colFirst" scope="col">Class</th>
<th class="colLast" scope="col">Description</th>
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<td class="colFirst"><a href="../../../../../org/apache/hadoop/metrics2/lib/Interns.html" title="class in org.apache.hadoop.metrics2.lib">Interns</a></td>
<td class="colLast">
<div class="block">Helpers to create interned metrics info.</div>
</td>
</tr>
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<td class="colFirst"><a href="../../../../../org/apache/hadoop/metrics2/lib/MetricsRegistry.html" title="class in org.apache.hadoop.metrics2.lib">MetricsRegistry</a></td>
<td class="colLast">
<div class="block">An optional metrics registry class for creating and maintaining a
collection of MetricsMutables, making writing metrics source easier.</div>
</td>
</tr>
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<td class="colFirst"><a href="../../../../../org/apache/hadoop/metrics2/lib/MutableCounter.html" title="class in org.apache.hadoop.metrics2.lib">MutableCounter</a></td>
<td class="colLast">
<div class="block">The mutable counter (monotonically increasing) metric interface</div>
</td>
</tr>
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<td class="colFirst"><a href="../../../../../org/apache/hadoop/metrics2/lib/MutableCounterInt.html" title="class in org.apache.hadoop.metrics2.lib">MutableCounterInt</a></td>
<td class="colLast">
<div class="block">A mutable int counter for implementing metrics sources</div>
</td>
</tr>
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<td class="colFirst"><a href="../../../../../org/apache/hadoop/metrics2/lib/MutableCounterLong.html" title="class in org.apache.hadoop.metrics2.lib">MutableCounterLong</a></td>
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<div class="block">A mutable long counter</div>
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<td class="colFirst"><a href="../../../../../org/apache/hadoop/metrics2/lib/MutableGauge.html" title="class in org.apache.hadoop.metrics2.lib">MutableGauge</a></td>
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<div class="block">The mutable gauge metric interface</div>
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<td class="colFirst"><a href="../../../../../org/apache/hadoop/metrics2/lib/MutableGaugeFloat.html" title="class in org.apache.hadoop.metrics2.lib">MutableGaugeFloat</a></td>
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<div class="block">A mutable float gauge.</div>
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<td class="colFirst"><a href="../../../../../org/apache/hadoop/metrics2/lib/MutableGaugeInt.html" title="class in org.apache.hadoop.metrics2.lib">MutableGaugeInt</a></td>
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<div class="block">A mutable int gauge</div>
</td>
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<td class="colFirst"><a href="../../../../../org/apache/hadoop/metrics2/lib/MutableGaugeLong.html" title="class in org.apache.hadoop.metrics2.lib">MutableGaugeLong</a></td>
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<div class="block">A mutable long gauge</div>
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<td class="colFirst"><a href="../../../../../org/apache/hadoop/metrics2/lib/MutableMetric.html" title="class in org.apache.hadoop.metrics2.lib">MutableMetric</a></td>
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<div class="block">The mutable metric interface</div>
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<td class="colFirst"><a href="../../../../../org/apache/hadoop/metrics2/lib/MutableQuantiles.html" title="class in org.apache.hadoop.metrics2.lib">MutableQuantiles</a></td>
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<div class="block">Watches a stream of long values, maintaining online estimates of specific
quantiles with provably low error bounds.</div>
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<td class="colFirst"><a href="../../../../../org/apache/hadoop/metrics2/lib/MutableRate.html" title="class in org.apache.hadoop.metrics2.lib">MutableRate</a></td>
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<div class="block">A convenient mutable metric for throughput measurement</div>
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<td class="colFirst"><a href="../../../../../org/apache/hadoop/metrics2/lib/MutableRates.html" title="class in org.apache.hadoop.metrics2.lib">MutableRates</a></td>
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<div class="block">Helper class to manage a group of mutable rate metrics
This class synchronizes all accesses to the metrics it
contains, so it should not be used in situations where
there is high contention on the metrics.</div>
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<td class="colFirst"><a href="../../../../../org/apache/hadoop/metrics2/lib/MutableRatesWithAggregation.html" title="class in org.apache.hadoop.metrics2.lib">MutableRatesWithAggregation</a></td>
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<div class="block">Helper class to manage a group of mutable rate metrics.</div>
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<td class="colFirst"><a href="../../../../../org/apache/hadoop/metrics2/lib/MutableRollingAverages.html" title="class in org.apache.hadoop.metrics2.lib">MutableRollingAverages</a></td>
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<div class="block">
This class maintains a group of rolling average metrics.</div>
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<td class="colFirst"><a href="../../../../../org/apache/hadoop/metrics2/lib/MutableStat.html" title="class in org.apache.hadoop.metrics2.lib">MutableStat</a></td>
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<div class="block">A mutable metric with stats.</div>
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<td class="colFirst"><a href="../../../../../org/apache/hadoop/metrics2/lib/DefaultMetricsSystem.html" title="enum in org.apache.hadoop.metrics2.lib">DefaultMetricsSystem</a></td>
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<div class="block">The default metrics system singleton.</div>
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<h2 title="Package org.apache.hadoop.metrics2.lib Description">Package org.apache.hadoop.metrics2.lib Description</h2>
<div class="block">A collection of library classes for implementing metrics sources</div>
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