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From "Mariappan Asokan (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAPREDUCE-4808) Refactor MapOutput and MergeManager to facilitate reuse by Shuffle implementations
Date Sat, 19 Jan 2013 01:29:13 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-4808?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13557843#comment-13557843
] 

Mariappan Asokan commented on MAPREDUCE-4808:
---------------------------------------------

Chris,
   Any shuffle plugin can subclass {{Shuffle}} but should implement its own {{MergeManager.}}
 Allowing one to subclass {{MergeManagerImpl}} is not within scope of this Jira.  So, I am
okay to suppress the warning for now.

Thanks.
-- Asokan

                
> Refactor MapOutput and MergeManager to facilitate reuse by Shuffle implementations
> ----------------------------------------------------------------------------------
>
>                 Key: MAPREDUCE-4808
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-4808
>             Project: Hadoop Map/Reduce
>          Issue Type: New Feature
>            Reporter: Arun C Murthy
>            Assignee: Mariappan Asokan
>         Attachments: COMBO-mapreduce-4809-4812-4808.patch, M4808-0.patch, M4808-1.patch,
mapreduce-4808.patch, mapreduce-4808.patch, mapreduce-4808.patch, mapreduce-4808.patch, mapreduce-4808.patch,
mapreduce-4808.patch, mapreduce-4808.patch, mapreduce-4808.patch, MergeManagerPlugin.pdf,
MR-4808.patch
>
>
> Now that Shuffle is pluggable (MAPREDUCE-4049), it would be convenient for alternate
implementations to be able to reuse portions of the default implementation. 
> This would come with the strong caveat that these classes are LimitedPrivate and Unstable.

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