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HBASE-16211 JMXCacheBuster restarting the metrics system might cause tests to hang

This commit is contained in:
Enis Soztutar 2016-07-12 13:43:52 -07:00
parent 1765988609
commit 16be7bba53
1 changed files with 31 additions and 0 deletions
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31
hbase-hadoop2-compat/src/main/java/org/apache/hadoop/metrics2/impl/JmxCacheBuster.java
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@ -19,6 +19,7 @@ package org.apache.hadoop.metrics2.impl;
import java.util.concurrent.ScheduledFuture;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicBoolean;
import java.util.concurrent.atomic.AtomicReference;
import org.apache.commons.logging.Log;
@ -27,6 +28,9 @@ import org.apache.hadoop.hbase.classification.InterfaceAudience;
import org.apache.hadoop.metrics2.MetricsExecutor;
import org.apache.hadoop.metrics2.lib.DefaultMetricsSystem;
import org.apache.hadoop.metrics2.lib.MetricsExecutorImpl;
import org.apache.hadoop.util.StringUtils;
import com.google.common.annotations.VisibleForTesting;
/**
* JMX caches the beans that have been exported; even after the values are removed from hadoop's
@ -41,6 +45,7 @@ public class JmxCacheBuster {
private static final Log LOG = LogFactory.getLog(JmxCacheBuster.class);
private static AtomicReference<ScheduledFuture> fut = new AtomicReference<>(null);
private static MetricsExecutor executor = new MetricsExecutorImpl();
private static AtomicBoolean stopped = new AtomicBoolean(false);
private JmxCacheBuster() {
// Static only cache.
@ -50,16 +55,42 @@ public class JmxCacheBuster {
* For JMX to forget about all previously exported metrics.
*/
public static void clearJmxCache() {
if (LOG.isTraceEnabled()) {
LOG.trace("clearing JMX Cache" + StringUtils.stringifyException(new Exception()));
}
//If there are more then 100 ms before the executor will run then everything should be merged.
ScheduledFuture future = fut.get();
if ((future != null && (!future.isDone() && future.getDelay(TimeUnit.MILLISECONDS) > 100))) {
// BAIL OUT
return;
}
if (stopped.get()) {
return;
}
future = executor.getExecutor().schedule(new JmxCacheBusterRunnable(), 5, TimeUnit.SECONDS);
fut.set(future);
}
/**
* 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.
*/
@VisibleForTesting
public static void stop() {
stopped.set(true);
ScheduledFuture future = fut.get();
future.cancel(false);
}
/**
* Restarts the stopped service.
* @see #stop()
*/
@VisibleForTesting
public static void restart() {
stopped.set(false);
}
final static class JmxCacheBusterRunnable implements Runnable {
@Override
public void run() {