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https://issues.apache.org/jira/browse/HADOOP-3226?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12593112#action_12593112
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Owen O'Malley commented on HADOOP-3226:
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I think we should get rid of the spill versus merge combiner input/output
record counters. I think it would just confuse users over the distinction
between them.
> 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
>
>
> 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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