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https://issues.apache.org/jira/browse/MAPREDUCE-2454?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13444485#comment-13444485
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Mariappan Asokan commented on MAPREDUCE-2454:
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Hi Arun,
Sure, I will expand the pdf documentation I posted long ago and upload an
updated version shortly.
I also created a test which implements what I call as a NullSortPlugin. I will
copy this test as part of the patch. This implementation is very simple and it
basically demonstrates how sorting can be avoided to solve limit-N query
problem described in HIVE-2004 and MAPREDUCE-1928.
> 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
> Affects Versions: 2.0.0-alpha, 3.0.0, 2.2.0-alpha
> Reporter: Mariappan Asokan
> Assignee: Mariappan Asokan
> Priority: Minor
> Labels: features, performance, plugin, sort
> Attachments: HadoopSortPlugin.pdf, KeyValueIterator.java,
> MapOutputSorterAbstract.java, MapOutputSorter.java, mapreduce-2454.patch,
> mapreduce-2454.patch, mapreduce-2454.patch, mapreduce-2454.patch,
> mr-2454-on-mr-279-build82.patch.gz, MR-2454-trunkPatchPreview.gz,
> 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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