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Date: Tue, 1 Nov 2011 03:48:32 +0000 (UTC)
From: "Hadoop QA (Commented) (JIRA)" <jira@apache.org>
To: mapreduce-issues@hadoop.apache.org
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Subject: [jira] [Commented] (MAPREDUCE-3246) Make Task extensible to support
 modifications of Task or even alternate programming paradigms
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    [ https://issues.apache.org/jira/browse/MAPREDUCE-3246?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13140893#comment-13140893 ] 

Hadoop QA commented on MAPREDUCE-3246:
--------------------------------------

-1 overall.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12501729/MAPREDUCE-3246-extensible-task.v2.patch
  against trunk revision .

    +1 @author.  The patch does not contain any @author tags.

    +1 tests included.  The patch appears to include 2 new or modified tests.

    +1 javadoc.  The javadoc tool did not generate any warning messages.

    -1 javac.  The patch appears to cause tar ant target to fail.

    -1 findbugs.  The patch appears to cause Findbugs (version 1.3.9) to fail.

    +1 release audit.  The applied patch does not increase the total number of release audit warnings.

    -1 core tests.  The patch failed the unit tests build

    +1 contrib tests.  The patch passed contrib unit tests.

Test results: https://builds.apache.org/job/PreCommit-MAPREDUCE-Build/1231//testReport/
Console output: https://builds.apache.org/job/PreCommit-MAPREDUCE-Build/1231//console

This message is automatically generated.
                
> Make Task extensible to support modifications of Task or even alternate programming paradigms
> ---------------------------------------------------------------------------------------------
>
>                 Key: MAPREDUCE-3246
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-3246
>             Project: Hadoop Map/Reduce
>          Issue Type: Improvement
>          Components: task
>    Affects Versions: 0.23.0
>            Reporter: Binglin Chang
>            Assignee: Binglin Chang
>         Attachments: MAPREDUCE-3246-extensible-task.patch, MAPREDUCE-3246-extensible-task.v2.patch
>
>
> One of MRv2's goal is to support alternate programming paradigms, but building a application using YARN from the bottom is not trivial. In fact most component of MapReduce can be reused, mostly the scheduler/master side, and we can make changes/extensions only on the task/slave side, such as native tasks, hash-aggregation style combiner/reducer interfaces.
> The first thing to do I think is to make task/slave side extensible, more specific, the Task in JvmTask should serialized with class name, not simply a boolean isMap, and make task class name configurable in JobConf, there maybe other minor changes. By doing so, developers can at least extends their own MapTask/ReduceTask.
> I just post my initial thoughts here for opinions. If this change is OK, I can submit a patch, this is just a trivial work.

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