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From "Harsh J (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAPREDUCE-199) Locality hints for Reduce
Date Sun, 09 Sep 2012 15:51:08 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-199?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13451616#comment-13451616
] 

Harsh J commented on MAPREDUCE-199:
-----------------------------------

It may make more sense to have a separate serialized structure for multi-hosts (for partitions),
rather than leveraging the config object? Since the host list can grow and there are limits
on the config object's serialization size.
                
> 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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