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[Bug 1291690] [NEW] delete router interface fail if neutron and nvp out of sync

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Public bug reported:

It's similar to https://bugs.launchpad.net/neutron/+bug/1251422, but wrt routers.
If we delete a router from neutron that is already deleted in nvp, it throw 404 error. The correct behavior should be to delete it from neutron, if it's already deleted in nvp.

rainbow:~ bhuvan$ neutron router-interface-delete tempest-router 67056b2d-a924-4456-9050-ed0baa0eaf1a
404-{u'NeutronError': {u'message': u'Router d6f3c0c6-6884-467f-9a84-5a64b88f8936 has no interface on subnet 67056b2d-a924-4456-9050-ed0baa0eaf1a', u'type': u'RouterInterfaceNotFoundForS
ubnet', u'detail': u''}}

neutron server log. Note: 404 error from nvp  is logged at INFO level.
It should be a WARNING.

2014-03-12 22:42:26,149 (keystoneclient.middleware.auth_token): DEBUG auth_token _build_user_headers Received request from user: tempest-admin with project_id : csi-tenant-tempest and ro
les: csi-tenant-admin,csi-role-admin 
2014-03-12 22:42:26,151 (routes.middleware): DEBUG middleware __call__ Matched PUT /routers/d6f3c0c6-6884-467f-9a84-5a64b88f8936/remove_router_interface.json
2014-03-12 22:42:26,151 (routes.middleware): DEBUG middleware __call__ Route path: '/routers/:(id)/remove_router_interface.:(format)', defaults: {'action': u'remove_router_interface', 'c
ontroller': <wsgify at 68316752 wrapping <function resource at 0x410fb18>>}
2014-03-12 22:42:26,151 (routes.middleware): DEBUG middleware __call__ Match dict: {'action': u'remove_router_interface', 'controller': <wsgify at 68316752 wrapping <function resource at
 0x410fb18>>, 'id': u'd6f3c0c6-6884-467f-9a84-5a64b88f8936', 'format': u'json'}
2014-03-12 22:42:26,208 (neutron.api.v2.resource): INFO resource resource remove_router_interface failed (client error): Router d6f3c0c6-6884-467f-9a84-5a64b88f8936 has no interface on s
ubnet 67056b2d-a924-4456-9050-ed0baa0eaf1a
2014-03-12 22:42:26,210 (neutron.wsgi): INFO log write 17.199.81.86 - - [12/Mar/2014 22:42:26] "PUT /v2.0/routers/d6f3c0c6-6884-467f-9a84-5a64b88f8936/remove_router_interface.json HTTP/1
.1" 404 329 0.066915

** Affects: neutron
     Importance: Undecided
         Status: New


** Tags: nicira

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https://bugs.launchpad.net/bugs/1291690

Title:
  delete router interface fail if neutron and nvp out of sync

Status in OpenStack Neutron (virtual network service):
  New

Bug description:
  It's similar to https://bugs.launchpad.net/neutron/+bug/1251422, but wrt routers.
  If we delete a router from neutron that is already deleted in nvp, it throw 404 error. The correct behavior should be to delete it from neutron, if it's already deleted in nvp.

  rainbow:~ bhuvan$ neutron router-interface-delete tempest-router 67056b2d-a924-4456-9050-ed0baa0eaf1a
  404-{u'NeutronError': {u'message': u'Router d6f3c0c6-6884-467f-9a84-5a64b88f8936 has no interface on subnet 67056b2d-a924-4456-9050-ed0baa0eaf1a', u'type': u'RouterInterfaceNotFoundForS
  ubnet', u'detail': u''}}

  neutron server log. Note: 404 error from nvp  is logged at INFO level.
  It should be a WARNING.

  2014-03-12 22:42:26,149 (keystoneclient.middleware.auth_token): DEBUG auth_token _build_user_headers Received request from user: tempest-admin with project_id : csi-tenant-tempest and ro
  les: csi-tenant-admin,csi-role-admin 
  2014-03-12 22:42:26,151 (routes.middleware): DEBUG middleware __call__ Matched PUT /routers/d6f3c0c6-6884-467f-9a84-5a64b88f8936/remove_router_interface.json
  2014-03-12 22:42:26,151 (routes.middleware): DEBUG middleware __call__ Route path: '/routers/:(id)/remove_router_interface.:(format)', defaults: {'action': u'remove_router_interface', 'c
  ontroller': <wsgify at 68316752 wrapping <function resource at 0x410fb18>>}
  2014-03-12 22:42:26,151 (routes.middleware): DEBUG middleware __call__ Match dict: {'action': u'remove_router_interface', 'controller': <wsgify at 68316752 wrapping <function resource at
   0x410fb18>>, 'id': u'd6f3c0c6-6884-467f-9a84-5a64b88f8936', 'format': u'json'}
  2014-03-12 22:42:26,208 (neutron.api.v2.resource): INFO resource resource remove_router_interface failed (client error): Router d6f3c0c6-6884-467f-9a84-5a64b88f8936 has no interface on s
  ubnet 67056b2d-a924-4456-9050-ed0baa0eaf1a
  2014-03-12 22:42:26,210 (neutron.wsgi): INFO log write 17.199.81.86 - - [12/Mar/2014 22:42:26] "PUT /v2.0/routers/d6f3c0c6-6884-467f-9a84-5a64b88f8936/remove_router_interface.json HTTP/1
  .1" 404 329 0.066915

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