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https://issues.apache.org/jira/browse/HADOOP-849?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12461956
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Andrzej Bialecki commented on HADOOP-849:
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I have experienced this problem when trying to debug a mapred application - it
was very difficult to figure out what was wrong, because this error was
obscuring the real reason (which was a bug in my Mapper class).
Also, speaking with my Nutch hat on, if there are plans for substantial API
changes in trunk/ it would be good to have a bugfix release, which is still API
compatible, and which Nutch could use - there have been tons of fixes since
0.9.2 ...
> randomwriter fails with 'java.lang.OutOfMemoryError: Java heap space' in the
> 'reduce' task
> ------------------------------------------------------------------------------------------
>
> Key: HADOOP-849
> URL: https://issues.apache.org/jira/browse/HADOOP-849
> Project: Hadoop
> Issue Type: Bug
> Reporter: Arun C Murthy
> Assigned To: Devaraj Das
> Fix For: 0.9.2
>
> Attachments: 849.patch
>
>
> Reproducible, tried to increase the child jvm's heapsize via
> <property>
> <name>mapred.child.java.opts</name>
> <value>-Xmx512m</value>
> </property>
> without any difference, still fails.
> Need to investigate further.
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