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Date: Thu, 5 May 2011 09:34:03 +0000 (UTC)
From: "Steve Loughran (JIRA)" <jira@apache.org>
To: mapreduce-issues@hadoop.apache.org
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Subject: [jira] [Commented] (MAPREDUCE-2454) Allow external sorter plugin
 for MR
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    [ https://issues.apache.org/jira/browse/MAPREDUCE-2454?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13029249#comment-13029249 ] 

Steve Loughran commented on MAPREDUCE-2454:
-------------------------------------------

Why shouldn't a sorter API also work with the existing sorter. If this is so, then the API and plugin code etc will get tested on every build, whereas a "a proof-of-concept implementation of an external sorter both on the
Map and Reduce sides using GNU sort command as the external sorter." isn't going to get tested very often, and the GPL license prevents the ASF from redistributing that sorter -ignoring all binary library issues-. 

> 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
>            Reporter: Mariappan Asokan
>            Priority: Minor
>         Attachments: KeyValueIterator.java, MapOutputSorter.java, MapOutputSorterAbstract.java, 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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