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From "Todd Lipcon (JIRA)" <j...@apache.org>
Subject [jira] Created: (MAPREDUCE-1304) Add counters for task time spent in GC
Date Wed, 16 Dec 2009 21:44:18 GMT
Add counters for task time spent in GC
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                 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


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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