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https://issues.apache.org/jira/browse/MAPREDUCE-1304?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12840256#action_12840256
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Aaron Kimball commented on MAPREDUCE-1304:
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Test failure is unrelated
> 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.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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