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https://issues.apache.org/jira/browse/MAPREDUCE-199?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13451766#comment-13451766
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Harsh J commented on MAPREDUCE-199:
-----------------------------------

Thanks for the feedback Ted, I'll come up with another patch that does it in 
the same way as the InputSplit structures as soon as I get some more free 
cycles.
                
> Locality hints for Reduce
> -------------------------
>
>                 Key: MAPREDUCE-199
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-199
>             Project: Hadoop Map/Reduce
>          Issue Type: New Feature
>          Components: applicationmaster, mrv2
>            Reporter: Benjamin Reed
>            Assignee: Harsh J
>         Attachments: MAPREDUCE-199.patch, MAPREDUCE-199.patch
>
>
> It would be nice if we could add method to OutputFormat that would allow a 
> job to indicate where a reducer for a given partition should should run. This 
> is similar to the getSplits() method on InputFormat. In our application the 
> reducer is using other data in addition to the map outputs during processing 
> and data accesses could be made more efficient if the JobTracker scheduled 
> the reducers to run on specific hosts.

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