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From "Dmitriy Lyubimov (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAHOUT-1636) Class dependencies for the spark module are put in a job.jar, which is very inefficient
Date Wed, 24 Dec 2014 01:04:53 GMT

    [ https://issues.apache.org/jira/browse/MAHOUT-1636?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14257756#comment-14257756
] 

Dmitriy Lyubimov commented on MAHOUT-1636:
------------------------------------------

Btw there should be far more judiciousness in adding 3rd party dependencies to project. Scopt
carries MIT license. You really should ping Grant or whoever current PMC chair for approval
of that. I am not sure if MIT is compable subset of Apache2 to allow redistributions. 

> Class dependencies for the spark module are put in a job.jar, which is very inefficient
> ---------------------------------------------------------------------------------------
>
>                 Key: MAHOUT-1636
>                 URL: https://issues.apache.org/jira/browse/MAHOUT-1636
>             Project: Mahout
>          Issue Type: Bug
>          Components: spark
>    Affects Versions: 1.0-snapshot
>            Reporter: Pat Ferrel
>             Fix For: 1.0-snapshot
>
>
> using a maven plugin and an assembly job.xml a job.jar is created with all dependencies
including transitive ones. This job.jar is in mahout/spark/target and is included in the classpath
when a Spark job is run. This allows dependency classes to be found at runtime but the job.jar
include a great deal of things not needed that are duplicates of classes found in the main
mrlegacy job.jar.  If the job.jar is removed, drivers will not find needed classes. A better
way needs to be implemented for including class dependencies.
> I'm not sure what that better way is so am leaving the assembly alone for now. Whoever
picks up this Jira will have to remove it after deciding on a better method.



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