David Tucker commented on HDFS-8422:

Jake should probably be unassigned from this issue.

> Recursive mkdir removes sticky bit when adding implicit u+wx to intermediate 
> directories
> ----------------------------------------------------------------------------------------
>                 Key: HDFS-8422
>                 URL: https://issues.apache.org/jira/browse/HDFS-8422
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: namenode
>    Affects Versions: 2.7.0
>            Reporter: Jake Low
>            Assignee: Jake Low
>            Priority: Minor
>         Attachments: HDFS-8422.001.patch, HDFS-8422.002.patch
> When performing a recursive {{mkdirs}} operation, the NameNode takes the 
> provided {{FsPermission}} and applies it to the final directory that is 
> created. The NameNode also uses these permissions when creating intermediate 
> directories, except it promotes with {{u+wx}} (i.e. {{mode |= 0300}}) in 
> order to ensure that there are sufficient permissions on the new directory to 
> create further subdirectories within it.
> Currently the code that does this permission promotion uses the 
> three-argument {{FsPermission}} constructor, which sets the sticky bit to 
> {{false}}. I think this is probably not the intended behaviour, so I'm 
> opening a bug. I'll attach a patch shortly that changes the behaviour so that 
> the sticky bit is always retained.

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