You are viewing a plain text version of this content. The canonical link for it is here.

Posted to mapreduce-dev@hadoop.apache.org by "Jason Lowe (JIRA)" <ji...@apache.org> on 2012/12/03 22:09:59 UTC

[jira] [Created] (MAPREDUCE-4842) Shuffle race can hang reducer

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.

--
This message is automatically generated by JIRA.
If you think it was sent incorrectly, please contact your JIRA administrators
For more information on JIRA, see: http://www.atlassian.com/software/jira