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From "Matthias Friedrich (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CRUNCH-16) Fix dependency versions
Date Wed, 18 Jul 2012 13:00:33 GMT

    [ https://issues.apache.org/jira/browse/CRUNCH-16?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13417051#comment-13417051
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Matthias Friedrich commented on CRUNCH-16:
------------------------------------------

Re 2.: Crunch used to depend on the bundled Guava but was changed to a separate, real Guava
in https://git-wip-us.apache.org/repos/asf?p=incubator-crunch.git;a=commit;h=9367826ee5516439852006c333702bd383241335.
I think we should keep it this way, it's the best solution.

Long term I'm interested in reducing the number of dependencies Crunch requires. More dependencies
mean more problems for users because of incompatibilities with application code. Guava is
great in this regard because it replaces a lot of stuff from commons-*. In fact, we could
trivially remove the dependency on commons-lang, but that's a different matter.
                
> Fix dependency versions
> -----------------------
>
>                 Key: CRUNCH-16
>                 URL: https://issues.apache.org/jira/browse/CRUNCH-16
>             Project: Crunch
>          Issue Type: Task
>            Reporter: Matthias Friedrich
>            Priority: Critical
>              Labels: maven
>
> Right now, the compile time classpath doesn't exactly match the runtime classpath. For
example, Hadoop CDH3u4 comes with slf4j-api-1.4.3 while Crunch references slf4j-api-1.6.3.
This could result in NoSuchMethodError and other nasty problems.
> We have to make sure that version numbers match (check "mvn dependency:tree") and that
we don't ship artifacts that are already present on the runtime classpath. If our dependencies
introduce incompatible transitive dependencies, we might have to downgrade them.
> Note: Maven's dependency resolution is order-dependent, see http://maven.apache.org/guides/introduction/introduction-to-dependency-mechanism.html

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