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https://issues.apache.org/jira/browse/HADOOP-8551?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13463132#comment-13463132
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Suresh Srinivas commented on HADOOP-8551:
-----------------------------------------

We should update the release notes to indicate that this is incompatible 
change. Please add in release notes what details about incompatibility and how 
to work around it. Also we need to move this change description to incompatible 
section.

Does this not cause issues at Yahoo?
                
> fs -mkdir creates parent directories without the -p option
> ----------------------------------------------------------
>
>                 Key: HADOOP-8551
>                 URL: https://issues.apache.org/jira/browse/HADOOP-8551
>             Project: Hadoop Common
>          Issue Type: Bug
>          Components: fs
>    Affects Versions: 0.23.3, 2.0.0-alpha, 3.0.0
>            Reporter: Robert Joseph Evans
>            Assignee: John George
>             Fix For: 0.23.3, 2.0.2-alpha
>
>         Attachments: HADOOP-8551.patch, HADOOP-8551.patch, HADOOP-8551.patch, 
> HADOOP-8551.patch
>
>
> hadoop fs -mkdir foo/bar will work even if bar is not present.  It should 
> only work if -p is given and foo is not present.

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