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From "Mariappan Asokan (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAPREDUCE-2454) Allow external sorter plugin for MR
Date Fri, 20 Jul 2012 15:37:35 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-2454?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13419262#comment-13419262
] 

Mariappan Asokan commented on MAPREDUCE-2454:
---------------------------------------------

Hi Arun,
  I came across MAPREDUCE-1392 that mentions TestReduceFetch failures.  I was able to reproduce
intermittent failures when I ran the test repeatedly on my laptop.  I may be wrong but it
appears to be related to some timing issue.  I will investigate how the test can be stabilized
so that it is rerunnable.  If I find anything or have a proposal to fix this issue, I will
add my comments in MAPREDUCE-1392.

                
> 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
>            Reporter: Mariappan Asokan
>            Priority: Minor
>              Labels: features, performance, plugin, sort
>         Attachments: HadoopSortPlugin.pdf, KeyValueIterator.java, MR-2454-trunkPatchPreview.gz,
MapOutputSorter.java, MapOutputSorterAbstract.java, ReduceInputSorter.java, mapreduce-2454.patch,
mr-2454-on-mr-279-build82.patch.gz
>
>
> 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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