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From "Luke Lu (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAPREDUCE-4400) Fix performance regression for small jobs/workflows
Date Mon, 09 Jul 2012 19:09:35 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-4400?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13409740#comment-13409740
] 

Luke Lu commented on MAPREDUCE-4400:
------------------------------------

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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