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https://issues.apache.org/jira/browse/HADOOP-5131?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12668073#action_12668073
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Devaraj Das commented on HADOOP-5131:
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Looks good to me.
> ReduceCopier sleeps for a hardcoded interval of 5secs
> -----------------------------------------------------
>
> Key: HADOOP-5131
> URL: https://issues.apache.org/jira/browse/HADOOP-5131
> Project: Hadoop Core
> Issue Type: Bug
> Components: mapred
> Affects Versions: 0.20.0
> Reporter: Arun C Murthy
> Assignee: Arun C Murthy
> Attachments: HADOOP-5131_0_20090127.patch
>
>
> Currently the ReduceCopier.run has a hard-coded 5s sleep which hurts jobs
> where latency is important, we really should have a mechanism where the
> thread fetching task-completion events should notify the ReduceCopier.run.
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