How to remove a directory from a gluster volume when rmdir unexpectedly fails with "directory not empty"

Issue

There can be a situation where a directory looks empty from the mount point, but the backend brick still contains some entries in that directory. This is due to a bug (race condition) in the Gluster distribute module.

Because the mount point directory appears to be empty, a rmdir call might be expected to pass. However, since the backend brick still contains entries, the command would actually fail, and the directories would not be removed.