[jira] [Created] (HDFS-8422) Recursive mkdir removes sticky bit when adding implicit u+wx to intermediate directories

["Jake Low (JIRA)" <ji...@apache.org>]

Jake Low created HDFS-8422:
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             Summary: 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


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 `Permission` 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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