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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