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[Wenping Song <1872385@xxxxxxxxxxxxxxxxxx>]

Public bug reported:

When delete nova service by "nova service-delete <id>", this will delete the compute node's resource provider in Placement. But if there are child resource provider, Placement will throw exception(CannotDeleteParentResourceProvider) and don't delete the resource provider. When we add the host service again, Placement cannot insert new compute node resource provider, and we cannot use the compute node any more. So we should delete sub resource provider in tree when delete resource provider.
from nova-compute.log:
2020-04-10 16:10:35.087 6 ERROR nova.scheduler.client.report [req-ed9546ac-43c8-42ca-a102-427bd9fc03b1 - - - - -] [req-dc785a03-ffb6-453d-99af-09
8ebf23d23c] Failed to create resource provider record in placement API for UUID 169c0100-7123-42ca-a80a-b6770eaa4c84. Got 409: {"errors": [{"stat
us": 409, "request_id": "req-dc785a03-ffb6-453d-99af-098ebf23d23c", "detail": "There was a conflict when trying to complete your request.\n\n Con
flicting resource provider name: node11 already exists.  ", "title": "Conflict"}]}.

** Affects: nova
     Importance: Undecided
     Assignee: Wenping Song (wenping1)
         Status: New

** Changed in: nova
     Assignee: (unassigned) => Wenping Song (wenping1)

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https://bugs.launchpad.net/bugs/1872385

Title:
  delete sub resource provider  in tree

Status in OpenStack Compute (nova):
  New

Bug description:
  When delete nova service by "nova service-delete <id>", this will delete the compute node's resource provider in Placement. But if there are child resource provider, Placement will throw exception(CannotDeleteParentResourceProvider) and don't delete the resource provider. When we add the host service again, Placement cannot insert new compute node resource provider, and we cannot use the compute node any more. So we should delete sub resource provider in tree when delete resource provider.
  from nova-compute.log:
  2020-04-10 16:10:35.087 6 ERROR nova.scheduler.client.report [req-ed9546ac-43c8-42ca-a102-427bd9fc03b1 - - - - -] [req-dc785a03-ffb6-453d-99af-09
  8ebf23d23c] Failed to create resource provider record in placement API for UUID 169c0100-7123-42ca-a80a-b6770eaa4c84. Got 409: {"errors": [{"stat
  us": 409, "request_id": "req-dc785a03-ffb6-453d-99af-098ebf23d23c", "detail": "There was a conflict when trying to complete your request.\n\n Con
  flicting resource provider name: node11 already exists.  ", "title": "Conflict"}]}.

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