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https://issues.apache.org/jira/browse/YETUS-281?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15137978#comment-15137978
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Allen Wittenauer commented on YETUS-281:
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One optimization that might want to be made is whether we union or not for when 
root isn't in the list.  For some things (e.g., findbugs) we can't, but for 
some (unit) we could. For example, a patch that touches every pom.xml under 
YARN (one of my sample patches), gets a huge speed up by union'ing.  But those 
are pretty rare occurrences, so I'm not sure if it is worth the hassle.

> hadoop: use built-in dependency order
> -------------------------------------
>
>                 Key: YETUS-281
>                 URL: https://issues.apache.org/jira/browse/YETUS-281
>             Project: Yetus
>          Issue Type: Improvement
>          Components: Test Patch
>            Reporter: Allen Wittenauer
>            Assignee: Allen Wittenauer
>            Priority: Blocker
>         Attachments: YETUS-281.00.patch, YETUS-281.02.patch
>
>
> With the commit of YETUS-280, hadoop should loosen the reins a bit and drop 
> several hundred lines of code to use the built-in dependency creator.



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