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Date: Tue, 26 Feb 2013 19:02:13 +0000 (UTC)
From: "Robert Parker (JIRA)" <jira@apache.org>
To: mapreduce-issues@hadoop.apache.org
Message-ID: <JIRA.12633991.1361825239480.343889.1361905333954@arcas>
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Subject: [jira] [Updated] (MAPREDUCE-5027) Shuffle does not limit number of
 outstanding connections
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     [ https://issues.apache.org/jira/browse/MAPREDUCE-5027?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Robert Parker updated MAPREDUCE-5027:
-------------------------------------

    Attachment: MAPREDUCE-5027.patch
    
> 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.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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