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https://issues.apache.org/jira/browse/MAPREDUCE-230?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Allen Wittenauer resolved MAPREDUCE-230.
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Resolution: Won't Fix
This ship sailed a looooooong time ago.
> Need to document the controls for sorting and grouping into the reduce
> ----------------------------------------------------------------------
>
> Key: MAPREDUCE-230
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-230
> Project: Hadoop Map/Reduce
> Issue Type: Task
> Reporter: Owen O'Malley
> Assignee: Arun C Murthy
>
> The JavaDoc for the Reducer should document how to control the sort order of
> keys and values via the JobConf methods:
> {code}
> setOutputKeyComparatorClass
> setOutputValueGroupingComparator
> {code}
> Both methods desperately need better names. (I'd vote for
> setKeySortingComparator and setKeyGroupingComparator.)
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