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From "Arun C Murthy (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAPREDUCE-2454) Allow external sorter plugin for MR
Date Mon, 19 Nov 2012 19:28:05 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-2454?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13500529#comment-13500529
] 

Arun C Murthy commented on MAPREDUCE-2454:
------------------------------------------

{quote}
I agree with Asokan's arguments on why the shuffle ought to be passed to the merger as in
the latest patch. 
{quote}

-1

As I've noted before we are making changes without actual necessity, while hurting future
functionality such as reduce-side sort etc. by elevating 'merge' to be a primary operation.
I don't see the need for this, I haven't seen an actual argument why it's required.

IAC, I'm frankly getting tired of arguing details on a 100k patch - please break this up so
that I can review/commit them and we can actually have focussed discussions. Thanks.


                
> 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, 2.0.2-alpha
>            Reporter: Mariappan Asokan
>            Assignee: Mariappan Asokan
>            Priority: Minor
>              Labels: features, performance, plugin, sort
>         Attachments: HadoopSortPlugin.pdf, HadoopSortPlugin.pdf, KeyValueIterator.java,
MapOutputSorterAbstract.java, MapOutputSorter.java, mapreduce-2454-modified-code.patch, mapreduce-2454-modified-test.patch,
mapreduce-2454-new-test.patch, mapreduce-2454.patch, mapreduce-2454.patch, mapreduce-2454.patch,
mapreduce-2454.patch, mapreduce-2454.patch, mapreduce-2454.patch, mapreduce-2454.patch, mapreduce-2454.patch,
mapreduce-2454.patch, mapreduce-2454.patch, mapreduce-2454.patch, mapreduce-2454.patch, mapreduce-2454.patch,
mapreduce-2454.patch, mapreduce-2454.patch, mapreduce-2454.patch, mapreduce-2454.patch, mapreduce-2454.patch,
mapreduce-2454.patch, mapreduce-2454.patch, mapreduce-2454.patch, mapreduce-2454-protection-change.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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