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https://issues.apache.org/jira/browse/MAPREDUCE-3567?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13175118#comment-13175118
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Siddharth Seth commented on MAPREDUCE-3567:
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+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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