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From "Jason Lowe (JIRA)" <j...@apache.org>
Subject [jira] [Created] (MAPREDUCE-4804) Counters for the applicationmaster
Date Fri, 16 Nov 2012 21:23:12 GMT
Jason Lowe created MAPREDUCE-4804:
-------------------------------------

             Summary: Counters for the applicationmaster
                 Key: MAPREDUCE-4804
                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-4804
             Project: Hadoop Map/Reduce
          Issue Type: Improvement
          Components: applicationmaster
    Affects Versions: 0.23.5
            Reporter: Jason Lowe


We should provide counters for the AM itself to track interesting items such as time spent
garbage collecting, cpu time spent, etc.  Currently there are no counters specifically for
the AM, so it's difficult to tell if the AM is running very low on heap space, spending a
lot of time thrashing in garbage collecting, and slowing down the job in general.

There are some details to work out on how these counters are tracked within the job.  Should
they be top-level job counters, or instead should they be treated like a separate task type
and therefore rolled into the corresponding collection of GC and CPU counters for all tasks
at the job level?

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