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https://issues.apache.org/jira/browse/MAPREDUCE-5027?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13593881#comment-13593881
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Robert Parker commented on MAPREDUCE-5027:
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Jon, I have uploaded a new patch for trunk and branch 0.23, I have eliminated
the timing issues in the test.
> 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-5027-4.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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