Currently both OzoneContainer#stop() and HddsDispatcher#stop() both invoke volumeSet.shutdown() explicitly to shutdown the same volume set.
In addition, OzoneContainer#stop() will invoke HddsDispatcher#stop(). Since the volume set object is created by OzoneContainer object, it should be the responsibility of OzoneContainer to shutdown. This ticket is opened to remove the volumeSet.shutdown() from HddsDispatcher#stop().
There are benchmark tools relies on HddsDispatcher#stop() to shutdown volumeSet object, that we could fix with explict volumeSet#shutdown call.