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https://issues.apache.org/jira/browse/MAPREDUCE-4808?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13551200#comment-13551200
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Mariappan Asokan commented on MAPREDUCE-4808:
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Hi Jerry,
Thanks for your feedback and comments. There may be several ways you can
implement a {{MergeManager}} plugin. Inheriting from current {{MergeManager}}
is one of them that you tried for your implementation.
I would suggest you take a look at the test that I created for the patch. It
contains a plugin implementation that does not do any sorting both on the map
and reduce sides. Although it is a very simple implementation, it is a good
starting point for your hash aggregation. I attached it to some of the
previous patches I posted for MAPREDUCE-2454. If you want the latest copy,
please shoot an e-mail to me. I will send it to you.
-- Asokan
> Allow reduce-side merge to be pluggable
> ---------------------------------------
>
> Key: MAPREDUCE-4808
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-4808
> Project: Hadoop Map/Reduce
> Issue Type: New Feature
> Affects Versions: 2.0.2-alpha
> Reporter: Arun C Murthy
> Assignee: Mariappan Asokan
> Fix For: 2.0.3-alpha
>
> Attachments: COMBO-mapreduce-4809-4812-4808.patch,
> mapreduce-4808.patch, mapreduce-4808.patch, mapreduce-4808.patch,
> mapreduce-4808.patch, mapreduce-4808.patch, MergeManagerPlugin.pdf
>
>
> Allow reduce-side merge to be pluggable for MAPREDUCE-2454
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