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https://issues.apache.org/jira/browse/HDFS-4619?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13664129#comment-13664129
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Steve Loughran commented on HDFS-4619:
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RawLocalFS could look for the dir existing and throw the exception if it exists
-and we were happy that this is the expected behaviour. I'm not sure it is.
The FS will throw {{FileAlreadyExistsException}} if a parent directory entry
exists and is not a directory. This is the same behaviour as -on a first
glance- HDFS does.
It is not an error to create a filesystem that is already there.
# we should add a test, if there is not one already, that creating a dir under
a file throws an exception.
# {{FileSystemContractBaseTest#testMkdirsFailsForSubdirectoryOfExistingFile()}}
verifies that trying to create a subdir of a file fails, while {{testMkdirs()}}
verifies that {{mkdirs()}} is idempotent, that it does not fail if called
repeatedly.
Which makes me think that {{RawLocalFileSystem}} is behaving according to its
specification -that just doesn't match the expectations of where it is called
> No Exception is thrown if we try to create directory using FileContext
> (create) on RawLocalFileSystem. Even if the directory already exists.
> ---------------------------------------------------------------------------------------------------------------------------------------------
>
> Key: HDFS-4619
> URL: https://issues.apache.org/jira/browse/HDFS-4619
> Project: Hadoop HDFS
> Issue Type: Bug
> Reporter: Omkar Vinit Joshi
> Priority: Critical
>
> as per FileContext create should fail if the file/directory is already
> present. However if the underlying filesystem is RawLocalFileSystem then it
> doesn't throw any exception.
> FileContext.create()
> RawLocalFileSystem.mkdirs()
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