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https://issues.apache.org/jira/browse/MAPREDUCE-797?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12737155#action_12737155
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Aaron Kimball commented on MAPREDUCE-797:
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unrelated test failures
> MRUnit MapReduceDriver should support combiners
> -----------------------------------------------
>
> Key: MAPREDUCE-797
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-797
> Project: Hadoop Map/Reduce
> Issue Type: Improvement
> Reporter: Aaron Kimball
> Assignee: Aaron Kimball
> Attachments: MAPREDUCE-797.patch
>
>
> The MapReduceDriver allows you to specify a mapper and a reducer class with a
> simple sort/"shuffle" between the passes. It would be nice to also support
> another Reducer implementation being used as a combiner in the middle.
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