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Tsuyoshi OZAWA commented on TEZ-145:
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Thanks for good suggestions, [~gopalv] and [~bikassaha]. I took some days to
benchmark base line of Tez. Now I started to implement this feature in
{{YARNRunner#createDAG}} with TaskLocationHint - host-local R and racklocal R
as Gopal mentioned. I'll share you when I have any progress. Thanks!
> 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: TEZ-1
>
> 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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