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From "Harsh J (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAPREDUCE-199) Locality hints for Reduce
Date Mon, 10 Sep 2012 05:39:09 GMT

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

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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