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From "Luke Lu (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAPREDUCE-4400) Fix performance regression for small jobs/workflows
Date Thu, 19 Jul 2012 18:28:36 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-4400?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13418539#comment-13418539

Luke Lu commented on MAPREDUCE-4400:

Yes. The speed up is more pronounced with outofband heartbeat, which has similar effect of
MAPREDUCE-1906 (which is not in branch-1). MRv2 doesn't need this patch as it was addressed
by MAPREDUCE-3809. Tom, can we file a separate jira to improve the change in trunk? 

Shrinivas, you're encouraged to review and +1 on the patch :)
> 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:, 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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