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From "Jason Lowe (JIRA)" <j...@apache.org>
Subject [jira] [Created] (MAPREDUCE-5027) Shuffle does not limit number of outstanding connections
Date Mon, 25 Feb 2013 20:48:12 GMT
Jason Lowe created MAPREDUCE-5027:
-------------------------------------

             Summary: Shuffle does not limit number of outstanding connections
                 Key: MAPREDUCE-5027
                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-5027
             Project: Hadoop Map/Reduce
          Issue Type: Bug
    Affects Versions: 0.23.5, 2.0.3-alpha
            Reporter: Jason Lowe


The ShuffleHandler does not have any configurable limits to the number of outstanding connections
allowed.  Therefore a node with many map outputs and many reducers in the cluster trying to
fetch those outputs can exhaust a nodemanager out of file descriptors.

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