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From "Hudson (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAPREDUCE-5027) Shuffle does not limit number of outstanding connections
Date Wed, 06 Mar 2013 00:20:13 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-5027?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13594141#comment-13594141
] 

Hudson commented on MAPREDUCE-5027:
-----------------------------------

Integrated in Hadoop-trunk-Commit #3421 (See [https://builds.apache.org/job/Hadoop-trunk-Commit/3421/])
    MAPREDUCE-5027. Shuffle does not limit number of outstanding connections (Robert Parker
via jeagles) (Revision 1453098)

     Result = SUCCESS
jeagles : http://svn.apache.org/viewcvs.cgi/?root=Apache-SVN&view=rev&rev=1453098
Files : 
* /hadoop/common/trunk/hadoop-mapreduce-project/CHANGES.txt
* /hadoop/common/trunk/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-core/src/main/resources/mapred-default.xml
* /hadoop/common/trunk/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-shuffle/src/main/java/org/apache/hadoop/mapred/ShuffleHandler.java
* /hadoop/common/trunk/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-shuffle/src/test/java/org/apache/hadoop/mapred/TestShuffleHandler.java

                
> 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
>             Fix For: 3.0.0, 0.23.7, 2.0.4-beta
>
>         Attachments: MAPREDUCE-5027-2.patch, MAPREDUCE-5027-3.patch, MAPREDUCE-5027-4.patch,
MAPREDUCE-5027-b023-2.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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