[jira] [Commented] (MAPREDUCE-4482) Backport MR sort plugin(MAPREDUCE-2454) to Hadoop 1.2

["Mariappan Asokan (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/MAPREDUCE-4482?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13449060#comment-13449060 ] 

Mariappan Asokan commented on MAPREDUCE-4482:
---------------------------------------------

At this point, it appears to be a difficult task to back-port MAPREDUCE-318 as there were more changes incorporated on top of MAPREDUCE-318.  So I am opting to refactor {{ReduceCopier}} in {{ReduceTask.java}}.  The shuffle and merge are coupled in this class right now.  I will break it into two classes namely {{ReduceCopier}} which just does the shuffle(will implement {{ShuffleRunner}} discussed in MAPREDUCE-2454) and {{ReduceMerger}} which does the merge.  {{ReduceMerger}} will implement {{ShuffleCallback}} interface.  The {{ShuffleCallback}} interface for 1.x will be slightly different from the one submitted for MAPREDUCE-2454 in order to accommodate subtle differences between 1.x and 2.x in their shuffle code.

I welcome suggestions from other developers.

Thanks.

-- Asokan

                
> Backport MR sort plugin(MAPREDUCE-2454) to Hadoop 1.2
> -----------------------------------------------------
>
>                 Key: MAPREDUCE-4482
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-4482
>             Project: Hadoop Map/Reduce
>          Issue Type: New Feature
>          Components: mrv1
>    Affects Versions: 1.2.0
>            Reporter: Mariappan Asokan
>


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