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From "Alejandro Abdelnur (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAPREDUCE-4421) Remove dependency on deployed MR jars
Date Wed, 15 Aug 2012 19:05:38 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-4421?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13435420#comment-13435420
] 

Alejandro Abdelnur commented on MAPREDUCE-4421:
-----------------------------------------------

This seems more a general YARN AM issue than a MR issue. 

How about tweaking YARN so a client can specify a {{yarn.am.lib.path}} property, which would
be a FileSystem accessible to all NMs (typically HDFS)? Then YARN would use that similarly
to distributed cache entries, localizing all JARs before bootstrapping the AM & tasks.
                
> 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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