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From: "Tsuyoshi Ozawa (JIRA)" <jira@apache.org>
To: mapreduce-issues@hadoop.apache.org
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Subject: [jira] [Commented] (MAPREDUCE-6447) reduce shuffle throws
 "java.lang.OutOfMemoryError: Java heap space"
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    [ https://issues.apache.org/jira/browse/MAPREDUCE-6447?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14693058#comment-14693058 ] 

Tsuyoshi Ozawa commented on MAPREDUCE-6447:
-------------------------------------------

Hi guys, thank you for reporting this issue. Do you mean that should we fix the default value to avoid the exception on this jira?

> reduce shuffle throws "java.lang.OutOfMemoryError: Java heap space"
> -------------------------------------------------------------------
>
>                 Key: MAPREDUCE-6447
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-6447
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>    Affects Versions: 2.5.0, 2.6.0, 2.5.1, 2.7.1
>            Reporter: shuzhangyao
>            Assignee: shuzhangyao
>            Priority: Minor
>
> 2015-08-11 14:03:54,550 WARN [main] org.apache.hadoop.mapred.YarnChild: Exception running child : org.apache.hadoop.mapreduce.task.reduce.Shuffle$ShuffleError: error in shuffle in fetcher#10
> 	at org.apache.hadoop.mapreduce.task.reduce.Shuffle.run(Shuffle.java:134)
> 	at org.apache.hadoop.mapred.ReduceTask.run(ReduceTask.java:376)
> 	at org.apache.hadoop.mapred.YarnChild$2.run(YarnChild.java:168)
> 	at java.security.AccessController.doPrivileged(Native Method)
> 	at javax.security.auth.Subject.doAs(Subject.java:415)
> 	at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1614)
> 	at org.apache.hadoop.mapred.YarnChild.main(YarnChild.java:163)
> Caused by: java.lang.OutOfMemoryError: Java heap space
> 	at org.apache.hadoop.io.BoundedByteArrayOutputStream.<init>(BoundedByteArrayOutputStream.java:56)
> 	at org.apache.hadoop.io.BoundedByteArrayOutputStream.<init>(BoundedByteArrayOutputStream.java:46)
> 	at org.apache.hadoop.mapreduce.task.reduce.InMemoryMapOutput.<init>(InMemoryMapOutput.java:63)
> 	at org.apache.hadoop.mapreduce.task.reduce.MergeManagerImpl.unconditionalReserve(MergeManagerImpl.java:303)
> 	at org.apache.hadoop.mapreduce.task.reduce.MergeManagerImpl.reserve(MergeManagerImpl.java:293)
> 	at org.apache.hadoop.mapreduce.task.reduce.Fetcher.copyMapOutput(Fetcher.java:511)
> 	at org.apache.hadoop.mapreduce.task.reduce.Fetcher.copyFromHost(Fetcher.java:329)
> 	at org.apache.hadoop.mapreduce.task.reduce.Fetcher.run(Fetcher.java:193)



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