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Date: Thu, 19 Jul 2012 18:28:36 +0000 (UTC)
From: "Luke Lu (JIRA)" <jira@apache.org>
To: mapreduce-issues@hadoop.apache.org
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Subject: [jira] [Commented] (MAPREDUCE-4400) Fix performance regression for
 small jobs/workflows
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    [ 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: 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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