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From "Gabriel Reid (JIRA)" <>
Subject [jira] [Commented] (CRUNCH-16) Fix dependency versions
Date Tue, 21 Aug 2012 15:02:38 GMT


Gabriel Reid commented on CRUNCH-16:

Josh, that's almost exactly what I was talking about, but I was actually thinking of having
the CAN_COMBINE_SPECIFIC_AND_REFLECT_SCHEMAS automatically initialized (in a static initializer
block) by a kind of mini-test that would actually actually attempt to combine both in a single
schema and set the static field as a result of that test. However, I'm kind of on the fence
as to whether it's worth it adding those kinds of moving parts to satisfy a use case that
probably won't come up much. 

I'm ok with it either way, but I don't mind taking a crack at implementing that idea if you
think it's worth including it.
> Fix dependency versions
> -----------------------
>                 Key: CRUNCH-16
>                 URL:
>             Project: Crunch
>          Issue Type: Task
>            Reporter: Matthias Friedrich
>            Assignee: Matthias Friedrich
>            Priority: Critical
>              Labels: maven
>         Attachments: 0001-CRUNCH-16-Fix-dependency-versions.patch, CRUNCH-16-avro-preparation.patch,
> 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

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