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Posted to dev@mahout.apache.org by "Sean Owen (JIRA)" <ji...@apache.org> on 2013/09/20 12:44:52 UTC

[jira] [Commented] (MAHOUT-1338) Reduce mahout-integration transitive dependencies to avoid JAR hell, version conflicts

    [ https://issues.apache.org/jira/browse/MAHOUT-1338?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13772928#comment-13772928 ] 

Sean Owen commented on MAHOUT-1338:
-----------------------------------

Guys I'm going to proceed with this. It should entail no functional change, is just a packaging simplification, and all still compiles and runs.
                
> Reduce mahout-integration transitive dependencies to avoid JAR hell, version conflicts
> --------------------------------------------------------------------------------------
>
>                 Key: MAHOUT-1338
>                 URL: https://issues.apache.org/jira/browse/MAHOUT-1338
>             Project: Mahout
>          Issue Type: Improvement
>    Affects Versions: 0.8
>            Reporter: Sean Owen
>            Assignee: Sean Owen
>            Priority: Minor
>         Attachments: MAHOUT-1338.patch
>
>
> mahout-integration contains bits of client and connector code for a lot of projects, like Lucene, Cassandra, MongoDB, etc. As such, its transitive dependencies in Maven pull in quite a lot. 
> Most of these are unnecessary for any particular user, since probably at most one client/package is of interest. In fact, mahout-integration is not used by most users at all. 
> In the worst case, it causes actual version problems when trying to package up the transitive dependencies of something depending on Mahout.
> I suggest several changes along these lines, all of which are represented in the attached patch:
> 1. Remove direct lucene-core and cassandra-all dependencies, as they are not necessary
> 2. Mark all dependencies like hector, mongodb, etc as optional in Maven
> 3. In fact, mark mahout-examples, mahout-buildtools and mahout-integration as optional with respect to the overall project.
> 4. Bonus: update Cassandra client version to pull in slightly newer deps

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