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From "Jason Lowe (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (MAPREDUCE-4954) ShuffleHandler logs excessively when channel closed prematurely by reducer
Date Tue, 22 Jan 2013 16:24:12 GMT

     [ https://issues.apache.org/jira/browse/MAPREDUCE-4954?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Jason Lowe resolved MAPREDUCE-4954.
-----------------------------------

    Resolution: Not A Problem

Sorry for the noise, I discovered the nodemanager in question was running 0.23.4 which did
not have the fix for MAPREDUCE-4801.
                
> 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: 2.0.3-alpha, 0.23.5
>            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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