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From "Luke Lu (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (MAPREDUCE-4400) Fix performance regression for small jobs/workflows
Date Thu, 26 Jul 2012 00:18:35 GMT

     [ https://issues.apache.org/jira/browse/MAPREDUCE-4400?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Luke Lu resolved MAPREDUCE-4400.
--------------------------------

             Tags: task, performance
       Resolution: Fixed
    Fix Version/s: 1.1.1
     Hadoop Flags: Reviewed

Thanks for the review and +1, Shrinivas and Tom! Created MAPREDUCE-4477 to track trunk improvement.
Committed the change to branch-1 and branch-1.1. It's not in 1.1.0-rc1 though.
                
> 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: performance, task
>    Affects Versions: 0.20.203.0, 1.0.3
>            Reporter: Luke Lu
>            Assignee: Luke Lu
>             Fix For: 1.1.1
>
>         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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