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https://issues.apache.org/jira/browse/MAPREDUCE-2454?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13029300#comment-13029300
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Steve Loughran commented on MAPREDUCE-2454:
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oh, and the security exceptions that get raised if the class does have a 
constructor with the right signature but it's private needs to get caught and 
turned into something else

> Allow external sorter plugin for MR
> -----------------------------------
>
>                 Key: MAPREDUCE-2454
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-2454
>             Project: Hadoop Map/Reduce
>          Issue Type: New Feature
>            Reporter: Mariappan Asokan
>            Priority: Minor
>         Attachments: KeyValueIterator.java, MapOutputSorter.java, 
> MapOutputSorterAbstract.java, ReduceInputSorter.java
>
>
> Define interfaces and some abstract classes in the Hadoop framework to 
> facilitate external sorter plugins both on the Map and Reduce sides.

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