Steve Loughran created HADOOP-12855:
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Summary: improvement
Key: HADOOP-12855
URL: https://issues.apache.org/jira/browse/HADOOP-12855
Project: Hadoop Common
Issue Type: Bug
Components: Add option to disable JVMPauseMonitor across services
Affects Versions: 2.8.0
Environment: JVMs with miniHDFS and miniYarn clusters
Reporter: Steve Loughran
Now that the YARN and HDFS services automatically start a JVM pause monitor, if
you start up the mini HDFS and YARN clusters, with history server, you are
spinning off 5 + threads, all looking for JVM pauses, all printing things out
when it happens.
We do not need these monitors in minicluster testing; they merely add load and
noise to tests.
Rather than retrofit new options everywhere, how about having a
"jvm.pause.monitor.enabled" flag (default true), which, when set, starts off
the monitor thread.
That way, the existing code is unchanged, there is always a JVM pause monitor
for the various services —it just isn't spinning up threads.
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