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From "Steve Loughran (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HADOOP-12855) improvement
Date Mon, 29 Feb 2016 14:42:18 GMT
Steve Loughran created HADOOP-12855:

             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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