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Date: Wed, 11 Jul 2012 14:12:36 +0000 (UTC)
From: "Harsh J (JIRA)" <jira@apache.org>
To: mapreduce-issues@hadoop.apache.org
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Subject: [jira] [Commented] (MAPREDUCE-4421) Remove dependency on deployed
 MR jars
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    [ https://issues.apache.org/jira/browse/MAPREDUCE-4421?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13411544#comment-13411544 ] 

Harsh J commented on MAPREDUCE-4421:
------------------------------------

Thanks Kihwal and Arun. I guess if its via a central, i.e., a dist-cache, we may lose some heterogenous cluster abilities (different OS versions forming a single cluster, with a chance that one's natives may not work on the other and needs uniquely compiled sets for each).

Not much of a worry, and I've hardly seen folks do this in the long run, but might be worth providing a solution for, in the future?
                
> Remove dependency on deployed MR jars
> -------------------------------------
>
>                 Key: MAPREDUCE-4421
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-4421
>             Project: Hadoop Map/Reduce
>          Issue Type: Improvement
>    Affects Versions: 2.0.0-alpha
>            Reporter: Arun C Murthy
>            Assignee: Arun C Murthy
>
> Currently MR AM depends on MR jars being deployed on all nodes via implicit dependency on YARN_APPLICATION_CLASSPATH. 
> We should stop adding mapreduce jars to YARN_APPLICATION_CLASSPATH and, probably, just rely on adding a shaded MR jar along with job.jar to the dist-cache.

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