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From "Alejandro Abdelnur (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAPREDUCE-5027) Shuffle does not limit number of outstanding connections
Date Mon, 25 Feb 2013 23:10:12 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-5027?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13586431#comment-13586431
] 

Alejandro Abdelnur commented on MAPREDUCE-5027:
-----------------------------------------------

The following may be handy: https://issues.jboss.org/browse/NETTY-311
                
> 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
>
> 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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