Steve Loughran commented on HADOOP-13278:

+ when you start using SSE-C & things, you need to handle decryption problems, 
otherwise SSE-C created mock dirs can't coexist with any other SSE-* encryption

> S3AFileSystem mkdirs does not need to validate parent path components
> ---------------------------------------------------------------------
>                 Key: HADOOP-13278
>                 URL: https://issues.apache.org/jira/browse/HADOOP-13278
>             Project: Hadoop Common
>          Issue Type: Bug
>          Components: fs/s3, tools
>            Reporter: Adrian Petrescu
>            Priority: Minor
> According to S3 semantics, there is no conflict if a bucket contains a key 
> named {{a/b}} and also a directory named {{a/b/c}}. "Directories" in S3 are, 
> after all, nothing but prefixes.
> However, the {{mkdirs}} call in {{S3AFileSystem}} does go out of its way to 
> traverse every parent path component for the directory it's trying to create, 
> making sure there's no file with that name. This is suboptimal for three main 
> reasons:
>  * Wasted API calls, since the client is getting metadata for each path 
> component 
>  * This can cause *major* problems with buckets whose permissions are being 
> managed by IAM, where access may not be granted to the root bucket, but only 
> to some prefix. When you call {{mkdirs}}, even on a prefix that you have 
> access to, the traversal up the path will cause you to eventually hit the 
> root bucket, which will fail with a 403 - even though the directory creation 
> call would have succeeded.
>  * Some people might actually have a file that matches some other file's 
> prefix... I can't see why they would want to do that, but it's not against 
> S3's rules.
> I've opened a pull request with a simple patch that just removes this portion 
> of the check. I have tested it with my team's instance of Spark + Luigi, and 
> can confirm it works, and resolves the aforementioned permissions issue for a 
> bucket on which we only had prefix access.
> This is my first ticket/pull request against Hadoop, so let me know if I'm 
> not following some convention properly :)

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