Arun Suresh created YARN-3470:

             Summary: Make PermissionStatusFormat public
                 Key: YARN-3470
             Project: Hadoop YARN
          Issue Type: Bug
            Reporter: Arun Suresh
            Priority: Minor

implementations of {{INodeAttributeProvider}} are required to provide an 
implementation of {{getPermissionLong()}} method. Unfortunately, the long 
permission format is an encoding of the user, group and mode with each field 
converted to int using {{SerialNumberManager}} which is package protected.

Thus it would be nice to make the {{PermissionStatusFormat}} enum public (and 
also make the {{toLong()}} static method public) so that user specified 
implementations of {{INodeAttributeProvider}} may use it.

This would also make it more consistent with {{AclStatusFormat}} which I guess 
has been made public for the same reason.

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