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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAPREDUCE-5027) Shuffle does not limit number of outstanding connections
Date Mon, 04 Mar 2013 16:23:13 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-5027?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13592323#comment-13592323
] 

Hadoop QA commented on MAPREDUCE-5027:
--------------------------------------

{color:red}-1 overall{color}.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12571895/MAPREDUCE-5027-b023.patch
  against trunk revision .

    {color:red}-1 patch{color}.  The patch command could not apply the patch.

Console output: https://builds.apache.org/job/PreCommit-MAPREDUCE-Build/3381//console

This message is automatically generated.
                
> 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: 2.0.3-alpha, 0.23.5
>            Reporter: Jason Lowe
>            Assignee: Robert Parker
>         Attachments: MAPREDUCE-5027-2.patch, MAPREDUCE-5027-3.patch, MAPREDUCE-5027-b023.patch,
MAPREDUCE-5027.patch, MAPREDUCE-5027.patch
>
>
> 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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