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From "Aaron Kimball (JIRA)" <j...@apache.org>
Subject [jira] Updated: (MAPREDUCE-1304) Add counters for task time spent in GC
Date Sat, 27 Mar 2010 02:06:27 GMT

     [ https://issues.apache.org/jira/browse/MAPREDUCE-1304?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Aaron Kimball updated MAPREDUCE-1304:
-------------------------------------

    Attachment: MAPREDUCE-1304.3.patch

New patch incorporates CR comments.

I added a call to {{updateCounters()}} after the reporter thread is shut down, where the {{incrementGcCounter()}}
call used to be.

> Add counters for task time spent in GC
> --------------------------------------
>
>                 Key: MAPREDUCE-1304
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-1304
>             Project: Hadoop Map/Reduce
>          Issue Type: New Feature
>          Components: task
>            Reporter: Todd Lipcon
>            Assignee: Aaron Kimball
>         Attachments: MAPREDUCE-1304.2.patch, MAPREDUCE-1304.3.patch, MAPREDUCE-1304.patch
>
>
> It's easy to grab the number of millis spent in GC (see JvmMetrics for example). Exposing
these as task counters would be handy - occasionally I've seen user jobs where long GC pauses
cause big "unexplainable" performance problems, and a large counter would make it obvious
to the user what's going on.

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