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https://issues.apache.org/jira/browse/MAPREDUCE-199?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Harsh J resolved MAPREDUCE-199.
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Resolution: Won't Fix
This has been debated many times and the end reason has always been that there
just isn't any merit in trying to schedule reducers with given locality (or
hints of).
Resolving this old old one but am sure there were more recent tickets closed
with the same result.
> 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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