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https://issues.apache.org/jira/browse/HADOOP-4698?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12650064#action_12650064
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Steve Loughran commented on HADOOP-4698:
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What kind of memory is running out? Can you post the stack trace?
I've not been seeing this on the JRockit JVM, incidentally.
> TestMapRed fails with 64bit JDK
> -------------------------------
>
> Key: HADOOP-4698
> URL: https://issues.apache.org/jira/browse/HADOOP-4698
> Project: Hadoop Core
> Issue Type: Bug
> Components: mapred, test
> Affects Versions: 0.19.0
> Reporter: Nigel Daley
> Assignee: Nigel Daley
> Fix For: 0.19.1
>
> Attachments: HADOOP-4698.patch
>
>
> 2 test cases in TestMapRed fail when run with 64bit JDK. They both run out
> of memory. This is due to the default value of io.sort.mb being used (100mb).
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