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Posted to mapreduce-issues@hadoop.apache.org by "Arun C Murthy (JIRA)" <ji...@apache.org> on 2009/11/04 02:35:32 UTC
[jira] Moved: (MAPREDUCE-1182) Reducers fail with OutOfMemoryError
while copying Map outputs
[ https://issues.apache.org/jira/browse/MAPREDUCE-1182?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Arun C Murthy moved HADOOP-6357 to MAPREDUCE-1182:
--------------------------------------------------
Fix Version/s: (was: 0.20.0)
0.20.2
Affects Version/s: (was: 0.20.0)
Key: MAPREDUCE-1182 (was: HADOOP-6357)
Project: Hadoop Map/Reduce (was: Hadoop Common)
> 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
> Fix For: 0.20.2
>
> 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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