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https://issues.apache.org/jira/browse/TEZ-145?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14340418#comment-14340418
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Tsuyoshi Ozawa commented on TEZ-145:
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Bikas, thank you for the comment. Make sense. As a first prototyping, I'll try 
to create CombinerProcessor.

> Support a combiner processor that can run non-local to map/reduce nodes
> -----------------------------------------------------------------------
>
>                 Key: TEZ-145
>                 URL: https://issues.apache.org/jira/browse/TEZ-145
>             Project: Apache Tez
>          Issue Type: Bug
>            Reporter: Hitesh Shah
>            Assignee: Tsuyoshi Ozawa
>              Labels: gsoc, gsoc2015, hadoop, java, tez
>
> For aggregate operators that can benefit by running in multi-level trees, 
> support of being able to run a combiner in a non-local mode would allow 
> performance efficiencies to be gained by running a combiner at a rack-level. 



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