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

     [ https://issues.apache.org/jira/browse/MAPREDUCE-199?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Harsh J updated MAPREDUCE-199:

    Attachment: MAPREDUCE-199.patch

Here's a first shot it. Adds support for locality hints via Job configuration (rather than
an API). Supports one host hint per partition at the moment.

For those who feel this would benefit: Would you like to have multi-host locality hinting
support for each partition, akin to maps?

Patch still needs some work, but hopefully the approach is right. Yet to test with a built
cluster to observe the locality pick-up, but the framework around these areas is pretty nice
(compared to MR1's JIP classes and such).
> 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
>         Attachments: 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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