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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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