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[Sean Dague <sean@xxxxxxxxx>]

This is a bigger feature / structural change. And needs to come in
through the specs process.

** Changed in: nova
       Status: Incomplete => Opinion

** Changed in: nova
   Importance: Undecided => Wishlist

** Changed in: nova
     Assignee: liunian (839274949-c) => (unassigned)

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https://bugs.launchpad.net/bugs/1263044

Title:
  Resize/migrate cannot reschedule

Status in OpenStack Compute (nova):
  Opinion

Bug description:
  In nova/compute/manager.py: def prep_resize()

  The design intends to catch every host error exception and then
  reschedule for resize/migrate like below:

          with self._error_out_instance_on_exception(context, instance['uuid'],
                                                     reservations):
              self.conductor_api.notify_usage_exists(
                      context, instance, current_period=True)
              self._notify_about_instance_usage(
                      context, instance, "resize.prep.start")
              try:
                  self._prep_resize(context, image, instance,
                                    instance_type, reservations,
                                    request_spec, filter_properties,
                                    node)
              except Exception:                                  <<<<<intend to catch host exception, and reschedule for resize/migrate
                  # try to re-schedule the resize elsewhere:
                  exc_info = sys.exc_info()
                  self._reschedule_resize_or_reraise(context, image, instance,
                          exc_info, instance_type, reservations, request_spec,
                          filter_properties)

  However, in self._prep_resize(), it would cast request of
  'resize_instance()'. Thus,  self._prep_resize() would return before
  resize_instance() finished. And resize_instance() may throw exception
  and reschedule is in need, but the exception would not be caught by
  prep_resize() and reschedule would not work.

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