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From "Jason Lowe (JIRA)" <j...@apache.org>
Subject [jira] [Created] (MAPREDUCE-4954) ShuffleHandler logs excessively when channel closed prematurely by reducer
Date Tue, 22 Jan 2013 16:16:13 GMT
Jason Lowe created MAPREDUCE-4954:
-------------------------------------

             Summary: ShuffleHandler logs excessively when channel closed prematurely by reducer
                 Key: MAPREDUCE-4954
                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-4954
             Project: Hadoop Map/Reduce
          Issue Type: Bug
    Affects Versions: 0.23.5, 2.0.3-alpha
            Reporter: Jason Lowe


As initially reported in MAPREDUCE-4801, the shuffle protocol allows a reducer to hangup the
connection to a nodemanager after receiving the shuffle header.  This can introduce a connection
reset IOException or a ClosedChannelException on the nodemanager.  Logging these is not very
interesting, and adds a lot of data to the NM log.

MAPREDUCE-4801 missed some places where these exceptions can occur, will post sample exceptions
below for reference.

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