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From "Hudson (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAPREDUCE-5493) In-memory map outputs can be leaked after shuffle completes
Date Tue, 17 Sep 2013 13:27:06 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-5493?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13769512#comment-13769512
] 

Hudson commented on MAPREDUCE-5493:
-----------------------------------

FAILURE: Integrated in Hadoop-Mapreduce-trunk #1551 (See [https://builds.apache.org/job/Hadoop-Mapreduce-trunk/1551/])
MAPREDUCE-5493. Cleanup in-memory & on-disk segments to prevent leak on shuffle completion.
Contributed by Jason Lowe. (acmurthy: http://svn.apache.org/viewcvs.cgi/?root=Apache-SVN&view=rev&rev=1523660)
* /hadoop/common/trunk/hadoop-mapreduce-project/CHANGES.txt
* /hadoop/common/trunk/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-core/src/main/java/org/apache/hadoop/mapreduce/task/reduce/MergeManagerImpl.java
* /hadoop/common/trunk/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-core/src/test/java/org/apache/hadoop/mapreduce/task/reduce/TestMerger.java

                
> In-memory map outputs can be leaked after shuffle completes
> -----------------------------------------------------------
>
>                 Key: MAPREDUCE-5493
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-5493
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>          Components: mrv2
>    Affects Versions: 2.1.0-beta, 0.23.9
>            Reporter: Jason Lowe
>            Assignee: Jason Lowe
>            Priority: Blocker
>             Fix For: 2.1.1-beta
>
>         Attachments: MAPREDUCE-5493-branch-0.23.patch, MAPREDUCE-5493.patch
>
>
> MergeManagerImpl#close adds the contents of inMemoryMergedMapOutputs and inMemoryMapOutputs
to a list of map outputs that is subsequently processed, but it does not clear those sets.
 This prevents some of the map outputs from being garbage collected and significantly reduces
the memory available for the subsequent reduce phase.

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