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https://issues.apache.org/jira/browse/HADOOP-6357?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12773010#action_12773010
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Hadoop QA commented on HADOOP-6357:
-----------------------------------
-1 overall. Here are the results of testing the latest attachment
http://issues.apache.org/jira/secure/attachment/12423911/HADOOP-6357.patch
against trunk revision 832249.
+1 @author. The patch does not contain any @author tags.
-1 tests included. The patch doesn't appear to include any new or modified
tests.
Please justify why no new tests are needed for this
patch.
Also please list what manual steps were performed to
verify this patch.
-1 patch. The patch command could not apply the patch.
Console output:
http://hudson.zones.apache.org/hudson/job/Hadoop-Patch-h4.grid.sp2.yahoo.net/124/console
This message is automatically generated.
> Reducers fail with OutOfMemoryError while copying Map outputs
> -------------------------------------------------------------
>
> Key: HADOOP-6357
> URL: https://issues.apache.org/jira/browse/HADOOP-6357
> Project: Hadoop Common
> Issue Type: Bug
> Affects Versions: 0.20.0
> Reporter: Chandra Prakash Bhagtani
> Fix For: 0.20.0
>
> Attachments: HADOOP-6357.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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