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https://issues.apache.org/jira/browse/HADOOP-12198?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14617393#comment-14617393
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Allen Wittenauer commented on HADOOP-12198:
-------------------------------------------

Some gotchas:

* I haven't checked if checkstyle also needs changes.  I suspect it might.
* I haven't tested what happens if/when modules disappear in a patch. That's an 
extreme edge case, but it's one that we should cover.  I'm tempted to punt on 
it for now.

> patches that hit multiple modules may need to build at root
> -----------------------------------------------------------
>
>                 Key: HADOOP-12198
>                 URL: https://issues.apache.org/jira/browse/HADOOP-12198
>             Project: Hadoop Common
>          Issue Type: Sub-task
>          Components: yetus
>            Reporter: Allen Wittenauer
>            Assignee: Allen Wittenauer
>         Attachments: HADOOP-12198.HADOOP-12111.00.patch
>
>
> Patches that introduce dependencies on other modules (e.g., HADOOP-12180) 
> need to effectively 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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