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https://issues.apache.org/jira/browse/CRUNCH-244?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13719712#comment-13719712
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Tom White commented on CRUNCH-244:
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In Avro we create three artifacts, one with the hadoop1 classifier, one with
hadoop2, and one without a classifier (identical to the hadoop1 JAR). E.g.
http://repo1.maven.org/maven2/org/apache/avro/avro-mapred/1.7.4/
> The second time it would fail to deploy because the crunch-core-0.7 already
> existed.
The way we deploy these is to run the hadoop2 profile first which actually
creates the hadoop2 artifact, and one without a classifier (but containing
hadoop2 classes), then we run the hadoop1 profile so that the one without a
classifier is overwritten with hadoop1 classes. Deploying to the Nexus repo
twice like this worked OK. See instructions under the "Building" section on
https://cwiki.apache.org/confluence/display/AVRO/How+To+Release
> I also think that if you use the secondary artifacts to group them all into a
> single groupId/artifactId/version, the POM file would only be describing one
> set of the dependencies and not the appropriate one for the version of hadoop
> you are compiling against.
That's true. In Avro it's OK since it's only the avro-mapred JAR we need to
treat like this, but in Crunch it is the core JAR which other artifacts in the
same project depend on. In Parquet we used reflection to avoid having to have
two binary artifacts, but unfortunately this would not be acceptable in Crunch
for [performance
reasons|https://issues.apache.org/jira/browse/CRUNCH-235?focusedCommentId=13700935&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-13700935].
> Would it be better if we actually changed the version in each profile?
I think so.
> Add support for hadoop1 and hadoop2 classifiers to the POM and release
> artifacts
> --------------------------------------------------------------------------------
>
> Key: CRUNCH-244
> URL: https://issues.apache.org/jira/browse/CRUNCH-244
> Project: Crunch
> Issue Type: Bug
> Reporter: Josh Wills
> Attachments: CRUNCH-244.patch
>
>
> We would like to be able to publish jars and binary release artifacts that
> are compiled against both the hadoop1 as well as the hadoop2 APIs as part of
> doing a release in order to make the transition easier for clients to use.
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