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https://issues.apache.org/jira/browse/MAPREDUCE-4400?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13415838#comment-13415838
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Shrinivas Joshi commented on MAPREDUCE-4400:
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Hi Luke - In our experiments your patch did achieve the same effect as what
MAPREDUCE-4381 was trying to in terms of performance. We noticed good
performance gains on Mahout KMeans clustering workload (~ 4%). It would be nice
if we can get the branch-1 version of your change reviewed and checked-in in
the mean time. Thanks.
> 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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