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From "Jason Lowe (JIRA)" <j...@apache.org>
Subject [jira] [Created] (MAPREDUCE-4842) Shuffle race can hang reducer
Date Mon, 03 Dec 2012 21:09:59 GMT
Jason Lowe created MAPREDUCE-4842:
-------------------------------------

             Summary: Shuffle race can hang reducer
                 Key: MAPREDUCE-4842
                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-4842
             Project: Hadoop Map/Reduce
          Issue Type: Bug
          Components: mrv2
    Affects Versions: 0.23.5, 2.0.3-alpha
            Reporter: Jason Lowe


Saw an instance where the shuffle caused multiple reducers in a job to hang.  It looked similar
to the problem described in MAPREDUCE-3721, where the fetchers were all being told to WAIT
by the MergeManager but no merge was taking place.

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