[jira] [Commented] (MAHOUT-1636) Class dependencies for the spark module are put in a job.jar, which is very inefficient

["Pat Ferrel (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/MAHOUT-1636?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14257346#comment-14257346 ] 

Pat Ferrel commented on MAHOUT-1636:
------------------------------------

[~dlyubimov] asked: Are we talking about classpath problems in front end or backend?

> 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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