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From Jose Angel López Otero (JIRA) <j...@apache.org>
Subject [jira] [Updated] (MAHOUT-663) Rationalize hadoop job creation with respect to setJarByClass
Date Thu, 30 May 2013 08:46:25 GMT

     [ https://issues.apache.org/jira/browse/MAHOUT-663?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Jose Angel López Otero updated MAHOUT-663:
------------------------------------------

    Attachment:     (was: MAHOUT-663.patch)
    
> Rationalize hadoop job creation with respect to setJarByClass
> -------------------------------------------------------------
>
>                 Key: MAHOUT-663
>                 URL: https://issues.apache.org/jira/browse/MAHOUT-663
>             Project: Mahout
>          Issue Type: Bug
>          Components: build
>    Affects Versions: 0.4, 0.5
>            Reporter: Benson Margulies
>            Assignee: Sean Owen
>             Fix For: 0.6
>
>         Attachments: MAHOUT-663.patch
>
>
> Mahout includes a series of driver classes that create hadoop jobs via static methods.
> Each one of these calls job.setJarByClass(itself.class).
> Unfortunately, this subverts the hadoop support for putting additional jars in the lib
directory of a job jar, since the class passed in is not a class that lives in the ordinary
section of the job jar.
> The effect of this is to force users of Mahout (and Mahout's own example job jar) to
unpack the mahout-core jar into the main section, instead of just treating it as a 'lib' dependency.
> It seems to me that all the static job creators should be refactored into a public function
that returns a job object (and does NOT call waitForCompletion), and then the existing wrapper.
Users could call the new functions, and make their own call to setJarByClass.

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