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From "Christopher Tubbs (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (ACCUMULO-1402) Hadoop2 maven artifacts
Date Wed, 15 May 2013 23:01:16 GMT

    [ https://issues.apache.org/jira/browse/ACCUMULO-1402?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13658970#comment-13658970
] 

Christopher Tubbs commented on ACCUMULO-1402:
---------------------------------------------

[~bmargulies], not quite.

* The pom files that it produces are not changed between the two builds.
* The hadoop2 compatible builds activated with -Dhadoop.profile=2.0 (property activation of
a profile).
* All the artifacts produced with the default hadoop1 profile do not have classifiers and
have the normal GAV attributes.
* All the artifacts produced with the hadoop2 profile have the "-hadoop2alpha" classifier
appended to the artifact name (GAVC). The way to get non-null main artifacts is to override
the maven-jar-plugin (or equivalent primary packaging plugin) configuration to add the classifier
option in the one profile that needs it.

So, essentially, the same POM produces multiple artifacts reproducibly, but it requires building
twice. I believe I can deploy them both to the same staging repository before closing the
repo. To get this to work, I had to push all the inter-module dependencies into the hadoop1
and hadoop2 profiles (even though they aren't 'provided' dependencies), so modules could refer
to their sibling with or without a classifier, depending on which build we were doing.
                
> Hadoop2 maven artifacts
> -----------------------
>
>                 Key: ACCUMULO-1402
>                 URL: https://issues.apache.org/jira/browse/ACCUMULO-1402
>             Project: Accumulo
>          Issue Type: Bug
>            Reporter: John Vines
>            Assignee: Christopher Tubbs
>              Labels: bad
>             Fix For: 1.5.0
>
>         Attachments: ACCUMULO-1402.v1.patch
>
>
> jars need to be compiled separately for hadoop1 vs. hadoop2. Both versions are used in
the wild, and will cause a lot of work helping users who do not realize this mistake when
they add a maven dependency and expect the one from central to work for their hadoop 2 installation.
We should package a separate hadoop2alpha set of jars to release to central for people working
against hadoop2 to use.

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