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From "Siddharth Seth (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAPREDUCE-3567) Extraneous JobConf objects in AM heap
Date Thu, 22 Dec 2011 22:37:30 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-3567?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13175118#comment-13175118
] 

Siddharth Seth commented on MAPREDUCE-3567:
-------------------------------------------

+1. Committed to trunk and branch-0.23. Thanks Vinod.
                
> Extraneous JobConf objects in AM heap
> -------------------------------------
>
>                 Key: MAPREDUCE-3567
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-3567
>             Project: Hadoop Map/Reduce
>          Issue Type: Sub-task
>          Components: mr-am, mrv2, performance
>    Affects Versions: 0.23.0
>            Reporter: Vinod Kumar Vavilapalli
>            Assignee: Vinod Kumar Vavilapalli
>             Fix For: 0.23.1
>
>         Attachments: MAPREDUCE-3567-20111215.1.txt, MAPREDUCE-3567-20111222.txt
>
>
> MR AM creates new JobConf objects unnecessarily in a couple of places in JobImpl and
TaskImpl which occupy non-trivial amount of heap.
> While working with a 64 bit JVM on 100K maps jobs, with uncompressed pointers, removing
those extraneous objects helped in addressing OOM with 2GB AM heap size.

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