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https://issues.apache.org/jira/browse/HADOOP-9438?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13614490#comment-13614490
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Arpit Agarwal commented on HADOOP-9438:
---------------------------------------

+1 for the idea. One round trip is better than two.

However it would be good to ensure that implementations of 
AbstractFileSystem.mkdir behave consistently. 

I cannot find an analog to FileSystemContractBaseTest for AbstractFileSystem. 
Interestingly FileSystem.mkdirs does not fail for pre-existing directories.
                
> LocalFileContext does not throw an exception on mkdir for already existing 
> directory
> ------------------------------------------------------------------------------------
>
>                 Key: HADOOP-9438
>                 URL: https://issues.apache.org/jira/browse/HADOOP-9438
>             Project: Hadoop Common
>          Issue Type: Bug
>            Reporter: Robert Joseph Evans
>            Priority: Critical
>
> according to 
> http://hadoop.apache.org/docs/current/api/org/apache/hadoop/fs/FileContext.html#mkdir%28org.apache.hadoop.fs.Path,%20org.apache.hadoop.fs.permission.FsPermission,%20boolean%29
> should throw a FileAlreadyExistsException if the directory already exists.
> I tested this and 
> {code}
> FileContext lfc = FileContext.getLocalFSFileContext(new Configuration());
> Path p = new Path("/tmp/bobby.12345");
> FsPermission cachePerms = new FsPermission((short) 0755);
> lfc.mkdir(p, cachePerms, false);
> lfc.mkdir(p, cachePerms, false);
> {code}
> never throws an exception.

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