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From "Jothi Padmanabhan (JIRA)" <j...@apache.org>
Subject [jira] Commented: (MAPREDUCE-1182) Reducers fail with OutOfMemoryError while copying Map outputs
Date Fri, 06 Nov 2009 04:50:33 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-1182?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12774211#action_12774211
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Jothi Padmanabhan commented on MAPREDUCE-1182:
----------------------------------------------

+1

> 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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