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https://issues.apache.org/jira/browse/MAPREDUCE-199?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13186831#comment-13186831
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Harsh J commented on MAPREDUCE-199:
-----------------------------------
But please reopen or open a new issue if need be (/me looks at HBase).
> Locality hints for Reduce
> -------------------------
>
> Key: MAPREDUCE-199
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-199
> Project: Hadoop Map/Reduce
> Issue Type: New Feature
> Reporter: Benjamin Reed
> Assignee: Owen O'Malley
>
> 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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