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https://issues.apache.org/jira/browse/MAPREDUCE-199?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13451952#comment-13451952
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Arun C Murthy commented on MAPREDUCE-199:
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I'm not sure I see the value in user-specifying 'hints', the way to get this to
work is to 'figure' where the map-outputs are (the AM knows it) and then try to
pick the right hosts/racks.
> 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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