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[Bence Romsics <bence.romsics@xxxxxxxxx>]

Public bug reported:

As discovered by lajoskatona while working on a fullstack test
(https://review.openstack.org/631793) the placement reporter plugin may
create some of the neutron resource providers in the wrong resource
provider tree. For example consider:

$ openstack --os-placement-api-version 1.17 resource provider list
+--------------------------------------+------------------------------------------+------------+--------------------------------------+--------------------------------------+
| uuid                                 | name                                     | generation | root_provider_uuid                   | parent_provider_uuid                 |
+--------------------------------------+------------------------------------------+------------+--------------------------------------+--------------------------------------+
| 89ca1421-5117-5348-acab-6d0e2054239c | devstack0:Open vSwitch agent             |          0 | 89ca1421-5117-5348-acab-6d0e2054239c | None                                 |
| 4a6f5f40-b7a1-5df4-9938-63983543f365 | devstack0:Open vSwitch agent:br-physnet0 |          2 | 89ca1421-5117-5348-acab-6d0e2054239c | 89ca1421-5117-5348-acab-6d0e2054239c |
| 193134fd-464c-5545-9d20-df7d58c0166f | devstack0:Open vSwitch agent:br-ex       |          2 | 89ca1421-5117-5348-acab-6d0e2054239c | 89ca1421-5117-5348-acab-6d0e2054239c |
| dbc498c7-8808-4f31-8abb-18560a4c3b53 | devstack0                                |          2 | dbc498c7-8808-4f31-8abb-18560a4c3b53 | None                                 |
| 4a8a819d-61f9-5822-8c5c-3e9c7cb942d6 | devstack0:NIC Switch agent               |          0 | dbc498c7-8808-4f31-8abb-18560a4c3b53 | dbc498c7-8808-4f31-8abb-18560a4c3b53 |
| 1c7e83f0-108d-5c35-ada7-7ebebbe43aad | devstack0:NIC Switch agent:ens5          |          2 | dbc498c7-8808-4f31-8abb-18560a4c3b53 | 4a8a819d-61f9-5822-8c5c-3e9c7cb942d6 |
+--------------------------------------+------------------------------------------+------------+--------------------------------------+--------------------------------------+

Please note that all RPs should have the root_provider_uuid set to the
devstack0 RP's uuid, but the open vswitch RPs have a different (wrong)
root. And 'devstack0:Open vSwitch agent' has no parent.

This situation is dependent on service startup order. The ovs RPs were
created before the compute host RP. That case should have been detected
as an error, but it was not.

I'll upload a proposed fix right away.

** Affects: neutron
     Importance: Undecided
     Assignee: Bence Romsics (bence-romsics)
         Status: New


** Tags: qos

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https://bugs.launchpad.net/bugs/1818683

Title:
  Placement reporter service plugin sometimes creates orphaned resource
  providers

Status in neutron:
  New

Bug description:
  As discovered by lajoskatona while working on a fullstack test
  (https://review.openstack.org/631793) the placement reporter plugin
  may create some of the neutron resource providers in the wrong
  resource provider tree. For example consider:

  $ openstack --os-placement-api-version 1.17 resource provider list
  +--------------------------------------+------------------------------------------+------------+--------------------------------------+--------------------------------------+
  | uuid                                 | name                                     | generation | root_provider_uuid                   | parent_provider_uuid                 |
  +--------------------------------------+------------------------------------------+------------+--------------------------------------+--------------------------------------+
  | 89ca1421-5117-5348-acab-6d0e2054239c | devstack0:Open vSwitch agent             |          0 | 89ca1421-5117-5348-acab-6d0e2054239c | None                                 |
  | 4a6f5f40-b7a1-5df4-9938-63983543f365 | devstack0:Open vSwitch agent:br-physnet0 |          2 | 89ca1421-5117-5348-acab-6d0e2054239c | 89ca1421-5117-5348-acab-6d0e2054239c |
  | 193134fd-464c-5545-9d20-df7d58c0166f | devstack0:Open vSwitch agent:br-ex       |          2 | 89ca1421-5117-5348-acab-6d0e2054239c | 89ca1421-5117-5348-acab-6d0e2054239c |
  | dbc498c7-8808-4f31-8abb-18560a4c3b53 | devstack0                                |          2 | dbc498c7-8808-4f31-8abb-18560a4c3b53 | None                                 |
  | 4a8a819d-61f9-5822-8c5c-3e9c7cb942d6 | devstack0:NIC Switch agent               |          0 | dbc498c7-8808-4f31-8abb-18560a4c3b53 | dbc498c7-8808-4f31-8abb-18560a4c3b53 |
  | 1c7e83f0-108d-5c35-ada7-7ebebbe43aad | devstack0:NIC Switch agent:ens5          |          2 | dbc498c7-8808-4f31-8abb-18560a4c3b53 | 4a8a819d-61f9-5822-8c5c-3e9c7cb942d6 |
  +--------------------------------------+------------------------------------------+------------+--------------------------------------+--------------------------------------+

  Please note that all RPs should have the root_provider_uuid set to the
  devstack0 RP's uuid, but the open vswitch RPs have a different (wrong)
  root. And 'devstack0:Open vSwitch agent' has no parent.

  This situation is dependent on service startup order. The ovs RPs were
  created before the compute host RP. That case should have been
  detected as an error, but it was not.

  I'll upload a proposed fix right away.

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