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[YAMAMOTO Takashi <yamamoto@xxxxxxxxxxxx>]

Public bug reported:

currently QosPolicyInUse check for delete_policy is in policy.delete().
it should be done before notifying the backends.

eg. test_delete_not_allowed_if_policy_in_use_by_network tempest test triggers the situation.
the following was seen on networking-midonet gate.  while the first delete_qos_policy failed
from POV of neutron api, it deleted the policy in the backend.  and the second delete_qos_policy
ends up with the following error.

http://logs.openstack.org/27/400627/12/check/gate-tempest-dsvm-
networking-midonet-v2-ubuntu-xenial/c4dad99/logs/screen-q-svc.txt.gz

2016-12-01 05:44:49.116 23924 ERROR midonetclient.api_lib [req-
91b72dde-2942-44c5-bb12-1bc479b9916c tempest-QosTestJSON-1358267085 -]
Got http error(response={'status': '404', 'content-length': '92',
'access-control-expose-headers': 'Location', 'vary': 'Accept-Encoding',
'server': 'Jetty(9.3.z-SNAPSHOT)', '-content-encoding': 'gzip', 'date':
'Thu, 01 Dec 2016 05:44:49 GMT', 'access-control-allow-origin': '*',
'access-control-allow-methods': 'GET, POST, PUT, DELETE, OPTIONS',
'content-type': 'application/vnd.org.midonet.Error-v1+json'},
content='{"message":"There is no QosPolicy with ID 2474a2ca-9629-4c51
-ae2f-18518a4aaaf0.","code":404}') for
request(uri=u'http://10.12.148.148:8181/midonet-
api/neutron/networks/114f5da9-9bae-4fd7-8095-44fad0d18da0',
method='PUT', body={'status': u'ACTIVE', 'subnets': [], 'name': u'test
network', 'admin_state_up': True, 'tenant_id':
u'a030938a0e554f4fa31dec5651446fbf', 'description': u'', 'tags': [],
'updated_at': '2016-12-01T05:44:49Z', 'mtu': 1500, 'router:external':
False, 'provider:network_type': 'midonet', 'revision_number': 4,
'port_security_enabled': True, 'shared': True, 'created_at':
'2016-12-01T05:44:48Z', 'project_id':
u'a030938a0e554f4fa31dec5651446fbf', 'id': u'114f5da9-9bae-
4fd7-8095-44fad0d18da0', 'qos_policy_id': u'2474a2ca-9629-4c51-ae2f-
18518a4aaaf0'}, query={},headers={'Content-Type':
'application/vnd.org.midonet.neutron.Network-v1+json', 'X-Auth-Token':
'gAAAAABYP7Y30jWsOPThAVKsDC8uc7JzrXDhiE5Qem4JMuz074sMgOLV7n6azX3LYdGKt0kB3
-j4r74fExTuzo1oCQgRG1pv763rSgTD5nrpOnvphnr9ew1cJpsHjofVWOitV8Y3lwTFxaKAiK2ovKa3ifH5tLOJm7v_-
uXaRaTd8vYb5n0QCf0'}). Raising exception=<HTTPNotFound at 0x7ff8dd456e60
404 Not Found>

** Affects: neutron
     Importance: Undecided
         Status: New


** Tags: qos

** Tags added: qos

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https://bugs.launchpad.net/bugs/1646370

Title:
  QosPolicyInUse after notifying the removal to backends

Status in neutron:
  New

Bug description:
  currently QosPolicyInUse check for delete_policy is in policy.delete().
  it should be done before notifying the backends.

  eg. test_delete_not_allowed_if_policy_in_use_by_network tempest test triggers the situation.
  the following was seen on networking-midonet gate.  while the first delete_qos_policy failed
  from POV of neutron api, it deleted the policy in the backend.  and the second delete_qos_policy
  ends up with the following error.

  http://logs.openstack.org/27/400627/12/check/gate-tempest-dsvm-
  networking-midonet-v2-ubuntu-xenial/c4dad99/logs/screen-q-svc.txt.gz

  2016-12-01 05:44:49.116 23924 ERROR midonetclient.api_lib [req-
  91b72dde-2942-44c5-bb12-1bc479b9916c tempest-QosTestJSON-1358267085 -]
  Got http error(response={'status': '404', 'content-length': '92',
  'access-control-expose-headers': 'Location', 'vary': 'Accept-
  Encoding', 'server': 'Jetty(9.3.z-SNAPSHOT)', '-content-encoding':
  'gzip', 'date': 'Thu, 01 Dec 2016 05:44:49 GMT', 'access-control-
  allow-origin': '*', 'access-control-allow-methods': 'GET, POST, PUT,
  DELETE, OPTIONS', 'content-type':
  'application/vnd.org.midonet.Error-v1+json'},
  content='{"message":"There is no QosPolicy with ID 2474a2ca-9629-4c51
  -ae2f-18518a4aaaf0.","code":404}') for
  request(uri=u'http://10.12.148.148:8181/midonet-
  api/neutron/networks/114f5da9-9bae-4fd7-8095-44fad0d18da0',
  method='PUT', body={'status': u'ACTIVE', 'subnets': [], 'name': u'test
  network', 'admin_state_up': True, 'tenant_id':
  u'a030938a0e554f4fa31dec5651446fbf', 'description': u'', 'tags': [],
  'updated_at': '2016-12-01T05:44:49Z', 'mtu': 1500, 'router:external':
  False, 'provider:network_type': 'midonet', 'revision_number': 4,
  'port_security_enabled': True, 'shared': True, 'created_at':
  '2016-12-01T05:44:48Z', 'project_id':
  u'a030938a0e554f4fa31dec5651446fbf', 'id': u'114f5da9-9bae-
  4fd7-8095-44fad0d18da0', 'qos_policy_id': u'2474a2ca-9629-4c51-ae2f-
  18518a4aaaf0'}, query={},headers={'Content-Type':
  'application/vnd.org.midonet.neutron.Network-v1+json', 'X-Auth-Token':
  'gAAAAABYP7Y30jWsOPThAVKsDC8uc7JzrXDhiE5Qem4JMuz074sMgOLV7n6azX3LYdGKt0kB3
  -j4r74fExTuzo1oCQgRG1pv763rSgTD5nrpOnvphnr9ew1cJpsHjofVWOitV8Y3lwTFxaKAiK2ovKa3ifH5tLOJm7v_-
  uXaRaTd8vYb5n0QCf0'}). Raising exception=<HTTPNotFound at
  0x7ff8dd456e60 404 Not Found>

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