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[Doug Hellmann <doug@xxxxxxxxxxxxxxxx>]

** Changed in: nova
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1516174

Title:
  nova-cells in api cells generate redundant instance.update
  notifications

Status in OpenStack Compute (nova):
  Fix Released

Bug description:
  Commit eaaa6593 causes instance updates in compute cells to generate
  redundant notifications by nova-cells in the api cell.  This can
  overwhelm notification consumers as instance.update notifications
  double in quantity, especially over short time periods like during
  multiple simultaneous instance creations.

  That commit used the Instance.skip_cells_sync() contextmanager with
  Instance.save() in instance_update_at_top() to prevent update cycles
  between api and compute cells, but the notification in Instance.save()
  is not guarded by _sync_cells, so notifications generated in compute
  cells are also generated in api cells.

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