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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAPREDUCE-5027) Shuffle does not limit number of outstanding connections
Date Fri, 01 Mar 2013 02:35:13 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-5027?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13590190#comment-13590190
] 

Hadoop QA commented on MAPREDUCE-5027:
--------------------------------------

{color:green}+1 overall{color}.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12571527/MAPREDUCE-5027-2.patch
  against trunk revision .

    {color:green}+1 @author{color}.  The patch does not contain any @author tags.

    {color:green}+1 tests included{color}.  The patch appears to include 1 new or modified
test files.

    {color:green}+1 tests included appear to have a timeout.{color}

    {color:green}+1 javac{color}.  The applied patch does not increase the total number of
javac compiler warnings.

    {color:green}+1 javadoc{color}.  The javadoc tool did not generate any warning messages.

    {color:green}+1 eclipse:eclipse{color}.  The patch built with eclipse:eclipse.

    {color:green}+1 findbugs{color}.  The patch does not introduce any new Findbugs (version
1.3.9) warnings.

    {color:green}+1 release audit{color}.  The applied patch does not increase the total number
of release audit warnings.

    {color:green}+1 core tests{color}.  The patch passed unit tests in hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-core
hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-shuffle.

    {color:green}+1 contrib tests{color}.  The patch passed contrib unit tests.

Test results: https://builds.apache.org/job/PreCommit-MAPREDUCE-Build/3376//testReport/
Console output: https://builds.apache.org/job/PreCommit-MAPREDUCE-Build/3376//console

This message is automatically generated.
                
> 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.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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