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https://issues.apache.org/jira/browse/MAPREDUCE-1884?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12978656#action_12978656
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Konstantin Shvachko commented on MAPREDUCE-1884:
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mapreduce.job.maps has been renamed to mapreduce.job.maps. Should we close 
this? MAPREDUCE-200 seems to be a more general approach.

> Remove/deprecate mapred.map.tasks tunable
> -----------------------------------------
>
>                 Key: MAPREDUCE-1884
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-1884
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>            Reporter: Allen Wittenauer
>             Fix For: 0.22.0
>
>
> Considering it isn't used for much that I know, is there any reason to keep 
> the mapred.map.tasks tunable hanging around?  If not, let's remove it from 
> the documentation, xml files, etc.  All it does is generate user confusion 
> when it doesn't work.

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