[jira] [Commented] (MAPREDUCE-4421) Remove dependency on deployed MR jars

["Hitesh Shah (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/MAPREDUCE-4421?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13782438#comment-13782438 ] 

Hitesh Shah commented on MAPREDUCE-4421:
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Sorry for the delay in the review. 

Regarding addMRFrameworkToDistributedCache() - one minor question:  the code allows for a non-qualified URI. Should we enforce provision of a fully-qualified path always?

Minor nit: I believe there should be nothing in the implementation that requires HDFS as the storage for the MR tarball? Documentation needs to change as a result unless you believe there are reasons for not mentioning other filesystems ( except maybe from a testing point of view )?

Patch looks good otherwise. Thanks for adding the detailed docs.




> 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-4421-2.patch, 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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