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| <pre>@InterfaceAudience.Private |
| public final class <a href="../../../../../src-html/org/apache/hadoop/metrics2/impl/JmxCacheBuster.html#line.42">JmxCacheBuster</a> |
| 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></pre> |
| <div class="block">JMX caches the beans that have been exported; even after the values are removed from hadoop's |
| metrics system the keys and old values will still remain. This class stops and restarts the |
| Hadoop metrics system, forcing JMX to clear the cache of exported metrics. |
| |
| This class need to be in the o.a.h.metrics2.impl namespace as many of the variables/calls used |
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| <td class="colFirst"><code>(package private) static class </code></td> |
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| <td class="colFirst"><code>private static <a href="../../../../../org/apache/hadoop/metrics2/MetricsExecutor.html" title="interface in org.apache.hadoop.metrics2">MetricsExecutor</a></code></td> |
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| <td class="colFirst"><code>private static <a href="https://docs.oracle.com/javase/8/docs/api/java/util/concurrent/atomic/AtomicReference.html?is-external=true" title="class or interface in java.util.concurrent.atomic">AtomicReference</a><<a href="https://docs.oracle.com/javase/8/docs/api/java/util/concurrent/ScheduledFuture.html?is-external=true" title="class or interface in java.util.concurrent">ScheduledFuture</a>></code></td> |
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| <td class="colFirst"><code>private static org.slf4j.Logger</code></td> |
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| <td class="colFirst"><code>static void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/metrics2/impl/JmxCacheBuster.html#clearJmxCache--">clearJmxCache</a></span>()</code> |
| <div class="block">For JMX to forget about all previously exported metrics.</div> |
| </td> |
| </tr> |
| <tr id="i1" class="rowColor"> |
| <td class="colFirst"><code>static void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/metrics2/impl/JmxCacheBuster.html#restart--">restart</a></span>()</code> |
| <div class="block">Restarts the stopped service.</div> |
| </td> |
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| <tr id="i2" class="altColor"> |
| <td class="colFirst"><code>static void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/metrics2/impl/JmxCacheBuster.html#stop--">stop</a></span>()</code> |
| <div class="block">Stops the clearing of JMX metrics and restarting the Hadoop metrics system.</div> |
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| <pre>private static final org.slf4j.Logger <a href="../../../../../src-html/org/apache/hadoop/metrics2/impl/JmxCacheBuster.html#line.43">LOG</a></pre> |
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| <div class="block">For JMX to forget about all previously exported metrics.</div> |
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| <div class="block">Stops the clearing of JMX metrics and restarting the Hadoop metrics system. This is needed for |
| some test environments where we manually inject sources or sinks dynamically.</div> |
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| <div class="block">Restarts the stopped service.</div> |
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