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https://issues.apache.org/jira/browse/MAPREDUCE-4400?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13409740#comment-13409740
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Luke Lu commented on MAPREDUCE-4400:
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Thanks for the pointer to MAPREDUCE-3809, Tom. IMO, this patch is slightly
better as it minimizes synchronization.
> Fix performance regression for small jobs/workflows
> ---------------------------------------------------
>
> Key: MAPREDUCE-4400
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-4400
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Components: task
> Affects Versions: 0.20.203.0, 1.0.3
> Reporter: Luke Lu
> Assignee: Luke Lu
> Attachments: mapreduce-4400-branch-1.patch
>
>
> There is a significant performance regression for small jobs/workflows (vs
> 0.20.2) in the Hadoop 1.x series. Most noticeable with Hive and Pig jobs.
> PigMix has an average 40% regression against 0.20.2.
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