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[Matt Riedemann <mriedem.os@xxxxxxxxx>]

** Also affects: nova/pike
   Importance: Undecided
       Status: New

** Also affects: nova/newton
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/1702454

Title:
  Transforming the RequestSpec object into legacy dicts doesn't support
  the requested_destination field

Status in OpenStack Compute (nova):
  In Progress
Status in OpenStack Compute (nova) newton series:
  New
Status in OpenStack Compute (nova) ocata series:
  New
Status in OpenStack Compute (nova) pike series:
  New

Bug description:
  We added a new field in the RequestSpec object called
  'requested_destination' and we began using it for evacuations by
  https://review.openstack.org/#/c/315572/ (Newton)

  That object was tranformed into legacy dictionaries (called
  "filter_properties" and "request_spec") before being rehydrated for
  the rebuild_instance() method in the conductor service. That said,
  when transforming, we were forgetting about the
  'requested_destination' field in the object so that when we were
  calling the scheduler, we were never using that field.

  That bug was fixed implicitly by
  https://review.openstack.org/#/c/469037/ which is now merged in
  master, but the issue is still there in stable branches, and if you
  need to use the legacy methods, you'll not have it.

  As a consequence, the feature to pass a destination for evacuation is
  not working in Newton and Ocata. Fortunately, given we didn't
  transformed the object into dicts before calling the scheduler for
  live-migrations, it does work for that action.

  A proper resolution would be to make sure that we pass the
  requested_destination field into 'filter_properties' so that when
  transforming again into an object, we set again the field.

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