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[OpenStack Infra <1872385@xxxxxxxxxxxxxxxxxx>]

Reviewed:  https://review.opendev.org/719163
Committed: https://git.openstack.org/cgit/openstack/nova/commit/?id=a45daafd3111a6804eb5adafe4860db122cb09b8
Submitter: Zuul
Branch:    master

commit a45daafd3111a6804eb5adafe4860db122cb09b8
Author: songwenping <songwenping@xxxxxxxxxx>
Date:   Sat Apr 11 18:28:01 2020 +0800

    Delete resource provider in tree by top-down traversable order
    
    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.
    
    Modify unit test.
    
    Change-Id: Ide8732be6c047ad1b141b89df676783b2fa2f25a
    Closes-Bug: #1872385


** Changed in: nova
       Status: In Progress => Fix Released

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

Title:
  delete sub resource provider  in tree

Status in OpenStack Compute (nova):
  Fix Released

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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