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[Matt Riedemann <mriedem.os@xxxxxxxxx>]

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

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

** Changed in: nova/ocata
   Importance: Undecided => High

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https://bugs.launchpad.net/bugs/1780727

Title:
  Handle HostMappingNotFound when deleting a service

Status in OpenStack Compute (nova):
  Fix Released
Status in OpenStack Compute (nova) ocata series:
  In Progress
Status in OpenStack Compute (nova) pike series:
  Fix Committed
Status in OpenStack Compute (nova) queens series:
  Fix Committed

Bug description:
  While deleting a service, we also try to delete the HostMapping before
  it here:
  https://github.com/openstack/nova/blob/fcf406003bcde2b60a515f694f2640e27a9d65fd/nova/api/openstack/compute/services.py#L243
  . However there could be a situation where we do not find the
  HostMapping (for instance when we run nova-manage cell_v2 delete_host
  before nova service-delete). This needs to be handled in the try catch
  block and if we do not find the host_mapping, we just need to proceed
  to deleting the service as opposed to the current behaviour where it
  gives a 500.

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