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https://issues.apache.org/jira/browse/MAHOUT-622?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13012232#comment-13012232
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Dmitriy Lyubimov commented on MAHOUT-622:
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bq. I would drop most of the properties that specify versions. Defining a
symbol that is used in one place doesn't really even save much.
Ok, half of that has been there before, i am just continuing the list. Ok i
will drop them.
> Mahout dependencies are unified under dependency management in parent pom
> -------------------------------------------------------------------------
>
> Key: MAHOUT-622
> URL: https://issues.apache.org/jira/browse/MAHOUT-622
> Project: Mahout
> Issue Type: Improvement
> Affects Versions: 0.4
> Reporter: Dmitriy Lyubimov
> Assignee: Dmitriy Lyubimov
> Priority: Minor
> Labels: build, maven, pom
> Fix For: 0.5
>
> Attachments: MAHOUT-622.patch
>
>
> As far as I understand, Maven encourages "best practice" of unified view of
> dependency versions specified under <dependencyManagement> usually in a
> parent pom, instead of under <dependencies>.
> In Mahout, this practice is only partially followed. Some dependencies have
> concrete versions under <dependencies> tag in submodule poms. Proposed change
> is to raid those and move version declarations into parent pom.
> This (as far as i understand) achieves 2 things:
> * Mahout assembly would include same versions for all modules thus ensuring
> runtime module dependencies are the same as compile time;
> * Somebody who uses Mahout as a dependency, could import Mahout dependencies
> using <scope>import</scope> spec thus inheriting Mahout's versions for shared
> dependencies.
> For most part the change would be nominal although in certain cases we'd need
> to sort out through cross-module conflicts (if any). Commons-math was one,
> not sure if there are more. If there are none, the changes would be rather
> mechanistic.
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