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https://issues.apache.org/jira/browse/HADOOP-4683?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12655905#action_12655905
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Owen O'Malley commented on HADOOP-4683:
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I don't think this is a regression. I think we should apply this to trunk, but
not 0.19 or 0.18.
> Move the call to getMapCompletionEvents in
> ReduceTask.ReduceCopier.fetchOutputs to a separate thread
> ----------------------------------------------------------------------------------------------------
>
> Key: HADOOP-4683
> URL: https://issues.apache.org/jira/browse/HADOOP-4683
> Project: Hadoop Core
> Issue Type: Bug
> Components: mapred
> Reporter: Devaraj Das
> Assignee: Jothi Padmanabhan
> Fix For: 0.20.0
>
> Attachments: hadoop-4683.patch
>
>
> The method ReduceTask.ReduceCopier.fetchOutputs makes a call to
> getMapCompletionEvents every iteration of the loop. This should be moved out
> to a separate thread. This might slow down the shuffle scheduler in some
> cases since there is a sleep inside the getMapCompletionEvents method.
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