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https://issues.apache.org/jira/browse/MAPREDUCE-2454?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13026335#comment-13026335
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Steve Loughran commented on MAPREDUCE-2454:
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# All new features should be on SVN-trunk, and with the plan to put
MAPREDUCE-279 in there, I would strongly encourage you to get involved with the
'279 project and make sure your needs are met there.
# It won't be enough to provide an interface, with one (private) implementation
behind it. Nobody is going to support that. What would be better would be to
have at least one implementation of the plugin in the main codebase -ideally it
would be how the normal sorter would work- along with the tests to verify that
everything works.
# The interfaces may want to extend {{Closeable}}, so they can be closed at the
end of their work.
> 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: MapOutputSorter.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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