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From "Vinod Kumar Vavilapalli (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAPREDUCE-3402) AMScalability test of Sleep job with 100K 1-sec maps regressed into running very slowly
Date Wed, 16 Nov 2011 08:58:51 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-3402?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13151099#comment-13151099
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Vinod Kumar Vavilapalli commented on MAPREDUCE-3402:
----------------------------------------------------

Independent invention! I was so into debugging I didn't check the JIRA posts. Yes, I am just
using the same benchmark, and reproduced many a oddities with 100K maps, and was extolling
you on the way for the benchmark :)

Playing with heap-dumps and profilers on this benchmark now.
                
> AMScalability test of Sleep job with 100K 1-sec maps regressed into running very slowly
> ---------------------------------------------------------------------------------------
>
>                 Key: MAPREDUCE-3402
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-3402
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>          Components: applicationmaster, mrv2
>    Affects Versions: 0.23.0
>            Reporter: Vinod Kumar Vavilapalli
>            Assignee: Vinod Kumar Vavilapalli
>             Fix For: 0.23.1
>
>
> The world was rosier before October 19-25, [~karams] says.
> The 100K 1 second sleep job used to take around 800mins or 13-14 mins. It now runs till
45 mins and still manages to complete only about 45K tasks.
> One/more of the flurry of commits for 0.23.0 deserve(s) the blame.

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