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https://issues.apache.org/jira/browse/MAPREDUCE-1788?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12973359#action_12973359
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Nigel Daley commented on MAPREDUCE-1788:
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Looks like the commit comment for MAPREDUCE-1778 mistakenly referenced this 
Jira instead.  Ignore the comment from Hudson above and the Subversion commit 
by Krishna.

> o.a.h.mapreduce.Job shouldn't make a copy of the JobConf
> --------------------------------------------------------
>
>                 Key: MAPREDUCE-1788
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-1788
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>          Components: client
>    Affects Versions: 0.21.0
>            Reporter: Arun C Murthy
>            Assignee: Arun C Murthy
>            Priority: Blocker
>
> Having o.a.h.mapreduce.Job make a copy of the passed in JobConf has several 
> issues: any modifications done by various pieces such as InputSplit etc. are 
> not reflected back and causes issues for frameworks built on top.

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