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https://issues.apache.org/jira/browse/HADOOP-3226?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Robert Chansler updated HADOOP-3226:
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Release Note: Added run of the combiner on the map side merge if there are
more than min.num.spills.for.combine (3 by default), and run of the combiner on
the reduce-side spills. (was: Runs the combiner on the map side merge if
there are more than min.num.spills.for.combine (3 by default). Also runs the
combiner on the reduce-side spills. )
Hadoop Flags: [Incompatible change, Reviewed] (was: [Reviewed,
Incompatible change])
> Run combiner when merging spills from map output
> ------------------------------------------------
>
> Key: HADOOP-3226
> URL: https://issues.apache.org/jira/browse/HADOOP-3226
> Project: Hadoop Core
> Issue Type: Improvement
> Reporter: Chris Douglas
> Assignee: Chris Douglas
> Fix For: 0.18.0
>
> Attachments: 3226-0.patch, 3226-1.patch, 3226-2.patch, 3226-3.patch
>
>
> When merging spills from the map, running the combiner should further
> diminish the volume of data we send to the reduce.
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