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From "Jason Lowe (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAPREDUCE-4421) Remove dependency on deployed MR jars
Date Wed, 31 Jul 2013 14:43:49 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-4421?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13725302#comment-13725302
] 

Jason Lowe commented on MAPREDUCE-4421:
---------------------------------------

I don't know the full history behind mapreduce.application.classpath, but my impression is
that originally the property was not intended to be modified per-job but rather set as a cluster-wide
property by ops since it effectively contains the location of the MR jars on each node.  mapreduce.application.framework.path
is similar, in the sense that I'd expect the common case would be ops to setup and maintain
the MR framework versions located in HDFS and most users would simply use it as-is.
                
> 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: Jason Lowe
>         Attachments: MAPREDUCE-4421.patch, MAPREDUCE-4421.patch
>
>
> 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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