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https://issues.apache.org/jira/browse/HADOOP-5493?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12682126#action_12682126
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Devaraj Das commented on HADOOP-5493:
-------------------------------------
I should that at this bug would affect only those jobs that have intermediate
compression on.
> Shuffle copiers do not return Codecs back to the pool at the end of shuffling
> -----------------------------------------------------------------------------
>
> Key: HADOOP-5493
> URL: https://issues.apache.org/jira/browse/HADOOP-5493
> Project: Hadoop Core
> Issue Type: Bug
> Components: mapred
> Reporter: Devaraj Das
> Assignee: Devaraj Das
> Priority: Blocker
> Fix For: 0.20.0
>
>
> At the end of shuffle, the copiers should return back the codecs to the pool.
> This doesn't happen and can potentially lead to a lot of memory leak on the
> reduce task (depending on how many shuffle copiers there are).
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