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From "Steve Loughran (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-12855) Add option to disable JVMPauseMonitor across services
Date Thu, 03 Mar 2016 10:31:18 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-12855?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15177629#comment-15177629

Steve Loughran commented on HADOOP-12855:

OK ... so we don't have (another) switch, but there isn't one per process, which is the situation
we have today, and which fills the test logs with too much noise.

I like this. After all, it'll pick up JVM pauses in testing too, and get coverage of the feature

> Add option to disable JVMPauseMonitor across services
> -----------------------------------------------------
>                 Key: HADOOP-12855
>                 URL: https://issues.apache.org/jira/browse/HADOOP-12855
>             Project: Hadoop Common
>          Issue Type: Improvement
>          Components: performance, test
>    Affects Versions: 2.8.0
>         Environment: JVMs with miniHDFS and miniYarn clusters
>            Reporter: Steve Loughran
>            Assignee: John Zhuge
>         Attachments: HADOOP-12855-001.patch, HADOOP-12855-002.patch
> 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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