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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] Commented: (MAPREDUCE-1182) Reducers fail with OutOfMemoryError while copying Map outputs
Date Thu, 05 Nov 2009 13:07:32 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-1182?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12773920#action_12773920
] 

Hadoop QA commented on MAPREDUCE-1182:
--------------------------------------

+1 overall.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12424117/M1182-1.patch
  against trunk revision 833006.

    +1 @author.  The patch does not contain any @author tags.

    +1 tests included.  The patch appears to include 6 new or modified tests.

    +1 javadoc.  The javadoc tool did not generate any warning messages.

    +1 javac.  The applied patch does not increase the total number of javac compiler warnings.

    +1 findbugs.  The patch does not introduce any new Findbugs warnings.

    +1 release audit.  The applied patch does not increase the total number of release audit
warnings.

    +1 core tests.  The patch passed core unit tests.

    +1 contrib tests.  The patch passed contrib unit tests.

Test results: http://hudson.zones.apache.org/hudson/job/Mapreduce-Patch-h3.grid.sp2.yahoo.net/128/testReport/
Findbugs warnings: http://hudson.zones.apache.org/hudson/job/Mapreduce-Patch-h3.grid.sp2.yahoo.net/128/artifact/trunk/build/test/findbugs/newPatchFindbugsWarnings.html
Checkstyle results: http://hudson.zones.apache.org/hudson/job/Mapreduce-Patch-h3.grid.sp2.yahoo.net/128/artifact/trunk/build/test/checkstyle-errors.html
Console output: http://hudson.zones.apache.org/hudson/job/Mapreduce-Patch-h3.grid.sp2.yahoo.net/128/console

This message is automatically generated.

> Reducers fail with OutOfMemoryError while copying Map outputs
> -------------------------------------------------------------
>
>                 Key: MAPREDUCE-1182
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-1182
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>            Reporter: Chandra Prakash Bhagtani
>            Assignee: Chandra Prakash Bhagtani
>            Priority: Blocker
>             Fix For: 0.20.2
>
>         Attachments: HADOOP-6357.patch, M1182-0.patch, M1182-0v20.patch, M1182-1.patch,
M1182-1v20.patch
>
>
> Reducers fail while copying Map outputs with following exception
> java.lang.OutOfMemoryError: Java heap space at org.apache.hadoop.mapred.ReduceTask$ReduceCopier$MapOutputCopier.shuffleInMemory(ReduceTask.java:1539)
at org.apache.hadoop.mapred.ReduceTask$ReduceCopier$MapOutputCopier.getMapOutput(ReduceTask.java:1432)
at org.apache.hadoop.mapred.ReduceTask$ReduceCopier$MapOutputCopier.copyOutput(ReduceTask.java:1285)
at org.apache.hadoop.mapred.ReduceTask$ReduceCopier$MapOutputCopier.run(ReduceTask.java:1216)
,Error:
> Reducer's memory usage keeps on increasing and ultimately exceeds -Xmx value  
> I even tried with -Xmx6.5g to each reducer but it's still failing 
> While looking into the reducer logs, I found that reducers were doing shuffleInMemory
every time, rather than doing shuffleOnDisk

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