nova/releasenotes/notes/resize-api-cast-always-7eb1...

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The ``resize`` and ``migrate`` server action APIs used to synchronously
block until a destination host is selected by the scheduler. Those APIs
now asynchronously return a response to the user before scheduling.
The response code remains 202 and users can monitor the operation via the
``status`` and ``OS-EXT-STS:task_state`` fields on the server resource and
also by using the ``os-instance-actions`` API. The most notable
change is ``NoValidHost`` will not be returned in a 400 error response
from the API if scheduling fails but that information is available via the
instance actions API interface.