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https://issues.apache.org/jira/browse/HADOOP-4915?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12657920#action_12657920
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Zheng Shao commented on HADOOP-4915:
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Our max heap size is 1GB. The direct buffer size is 64K by default. It might be
that we are allocating too many codecs for some reason.
> Out of Memory error in reduce shuffling phase when compression is turned on
> ---------------------------------------------------------------------------
>
> Key: HADOOP-4915
> URL: https://issues.apache.org/jira/browse/HADOOP-4915
> Project: Hadoop Core
> Issue Type: Bug
> Components: mapred
> Affects Versions: 0.17.2
> Reporter: Zheng Shao
>
> mapred.compress.map.output is set to true, and the job has 6860 mappers and
> 300 reducers.
> Several reducers failed because:out of memory error in the shuffling phase.
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