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https://issues.apache.org/jira/browse/HADOOP-3226?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12587510#action_12587510
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Owen O'Malley commented on HADOOP-3226:
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Either in this patch or a similar one, we should also run the combiner on the
reduce input merge spills.
> 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
> Fix For: 0.18.0
>
> Attachments: 3226-0.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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