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[melanie witt <1907511@xxxxxxxxxxxxxxxxxx>]

Bug doesn't exist on master branch.

** Changed in: nova
       Status: New => Invalid

** Changed in: nova
     Assignee: melanie witt (melwitt) => (unassigned)

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https://bugs.launchpad.net/bugs/1907511

Title:
  nova-multi-cell fails on stable branches with: Failed to
  compute_task_migrate_server: 'NoneType' object has no attribute
  'version'

Status in OpenStack Compute (nova):
  Invalid
Status in OpenStack Compute (nova) ussuri series:
  New
Status in OpenStack Compute (nova) victoria series:
  In Progress

Bug description:
  When we get a request to migrate a server that has minimum bandwidth
  resource requests, we check whether the service on the target host is
  new enough to support resource requests. However, we are not targeting
  the target host's cell database when we do the lookup. This works OK
  when the migration is occuring within the same cell, but if the target
  host is in another cell, we will fail to lookup the service record in
  the source cell with the following error [1]:

    Failed to compute_task_migrate_server: 'NoneType' object has no
    attribute 'version'

  This is because when Service.get_by_host_and_binary fails to find a
  matching record, it returns (and thus returns None).

  This failure has recently emerged in the nova-multi-cell gate job
  because tempest tests were recently added for minimum bandwidth
  resource requests in change:

  https://review.opendev.org/c/openstack/tempest/+/694539

  and these tests include migration tests.

  To fix this, we just need to target the cell database for the target
  host's service record when we lookup the service.

  This change is stable-only because the service version check was
  recently removed in change:

  https://review.opendev.org/c/openstack/nova/+/735570

  and only exists in stable branches.

  [1]
  https://zuul.opendev.org/t/openstack/build/2ee6a4a30c8f403b911386a6cd80fc51/log/controller/logs/screen-n
  -super-cond.txt#3778

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