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https://issues.apache.org/jira/browse/TEZ-145?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14357178#comment-14357178
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Tsuyoshi Ozawa commented on TEZ-145:
------------------------------------
{code}
+ if (hasFinalReduceStage) {
+ boolean hasHostLocalReduceStage =
+ conf.getBoolean(MRJobConfig.MRR_HOST_LOCAL_REDUCE,
MRJobConfig.DEFAULT_MRR_HOST_LOCAL_REDUCE);
+ if (hasHostLocalReduceStage) {
+ numIntermediateStages++;
+ }
+ boolean hasRackLocalReduceStage =
+ conf.getBoolean(MRJobConfig.MRR_RACK_LOCAL_REDUCE,
MRJobConfig.DEFAULT_MRR_RACK_LOCAL_REDUCE);
+ if (hasRackLocalReduceStage) {
+ numIntermediateStages++;
+ }
+ }
{code}
These options are not used for now.
> 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
> Attachments: WIP-TEZ-145-001.patch
>
>
> 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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