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https://issues.apache.org/jira/browse/HADOOP-12198?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14636035#comment-14636035
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Chris Nauroth commented on HADOOP-12198:
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bq. Definitely the latter. UNION is really calculated as a convenience since
I'm expecting a lot of projects to need it.
Great, this makes sense to me. Thanks for confirming!
> hadoop patches that hit multiple modules need to build at the union
> -------------------------------------------------------------------
>
> Key: HADOOP-12198
> URL: https://issues.apache.org/jira/browse/HADOOP-12198
> Project: Hadoop Common
> Issue Type: Sub-task
> Components: yetus
> Affects Versions: HADOOP-12111
> Reporter: Allen Wittenauer
> Assignee: Allen Wittenauer
> Fix For: HADOOP-12111
>
> Attachments: HADOOP-12198.HADOOP-12111.00.patch,
> HADOOP-12198.HADOOP-12111.02.patch, HADOOP-12198.HADOOP-12111.03.patch,
> HADOOP-12198.HADOOP-12111.03.patch, HADOOP-12198.HADOOP-12111.04.patch,
> HADOOP-12198.HADOOP-12111.05.patch
>
>
> Patches that introduce dependencies on other modules (e.g., HADOOP-12180)
> need to effectively be built at root.
> There is a good chance this type of logic will need to be done on a
> per-project basis.
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