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[Matt Riedemann <mriedem.os@xxxxxxxxx>]

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

** Changed in: nova/queens
       Status: New => Confirmed

** Changed in: nova/stein
   Importance: Undecided => Medium

** Changed in: nova/train
   Importance: Undecided => Medium

** Changed in: nova/rocky
   Importance: Undecided => Medium

** Changed in: nova/queens
   Importance: Undecided => Low

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Engineering Team, which is subscribed to OpenStack Compute (nova).
https://bugs.launchpad.net/bugs/1852610

Title:
  API allows source compute service/node deletion while instances are
  pending a resize confirm/revert

Status in OpenStack Compute (nova):
  Fix Released
Status in OpenStack Compute (nova) queens series:
  Confirmed
Status in OpenStack Compute (nova) rocky series:
  In Progress
Status in OpenStack Compute (nova) stein series:
  Fix Committed
Status in OpenStack Compute (nova) train series:
  Fix Committed

Bug description:
  This is split off from bug 1829479 which is about deleting a compute
  service which had servers evacuated from it which will orphan resource
  providers in placement.

  A similar scenario is true where the API will allow deleting a source
  compute service which has migration-based allocations for the source
  node resource provider and pending instance resizes involving the
  source node. A  simple scenario is:

  1. create a server on host1
  2. resize or cold migrate it to a dest host2
  3. delete the compute service for host1

  At this point the resource provider for host1 is orphaned.

  4. try to confirm/revert the resize of the server which will fail
  because the compute node for host1 is gone and this results in the
  server going to ERROR status

  Based on the discussion in this mailing list thread:

  http://lists.openstack.org/pipermail/openstack-
  discuss/2019-November/010843.html

  We should probably have the DELETE /os-services/{service_id} API block
  trying to delete a service that has pending migrations.

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