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Posted to mapreduce-issues@hadoop.apache.org by "Robert Parker (JIRA)" <ji...@apache.org> on 2013/02/26 19:54:13 UTC

[jira] [Assigned] (MAPREDUCE-5027) Shuffle does not limit number of outstanding connections

     [ https://issues.apache.org/jira/browse/MAPREDUCE-5027?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Robert Parker reassigned MAPREDUCE-5027:
----------------------------------------

    Assignee: Robert Parker
    
> 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
>
> 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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