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From "Chandra Prakash Bhagtani (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HADOOP-6357) Reducers fail with OutOfMemoryError while copying Map outputs
Date Tue, 03 Nov 2009 10:30:04 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-6357?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Chandra Prakash Bhagtani updated HADOOP-6357:
---------------------------------------------

    Attachment: HADOOP-6357.patch

this patch is against hadoop-0.20.0 release

> 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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