Exception in neutron port-list with simultaneous VM delete

[Prakash Bailkeri]

Exception in seen in nova while executing neutron port-list after VM delete.

127.0.0.1 - - [2015-03-18 09:24:35] "DELETE /virtual-machine/9516c312-eed0-4cb5-ac39-395912344798 HTTP/1.1" 200 115 0.007674
192.168.0.101 - - [2015-03-18 09:24:35] "POST /neutron/port HTTP/1.1" 200 115 0.066042
192.168.0.101 - - [2015-03-18 09:24:35] "GET /virtual-machine/9516c312-eed0-4cb5-ac39-395912344798 HTTP/1.1" 404 198 0.003772
192.168.0.101 - - [2015-03-18 09:24:35] "GET /virtual-machine/9516c312-eed0-4cb5-ac39-395912344798 HTTP/1.1" 404 198 0.002407
192.168.0.101 - - [2015-03-18 09:24:35] "GET /virtual-machine/9516c312-eed0-4cb5-ac39-395912344798 HTTP/1.1" 404 198 0.001352
127.0.0.1 - - [2015-03-18 09:24:35] "GET /logical-routers?count=False&obj_uuids=9516c312-eed0-4cb5-ac39-395912344798&detail=True HTTP/1.1" 404 171 0.001748
<class 'cfgm_common.exceptions.NoIdError'>
Python 2.7.3: /usr/bin/python
Wed Mar 18 09:24:35 2015

A problem occurred in a Python script. Here is the sequence of
function calls leading up to the error, in the order they occurred.

 /usr/lib/python2.7/dist-packages/vnc_openstack/neutron_plugin_interface.py in plugin_get_ports(self=<vnc_openstack.neutron_plugin_interface.NeutronPluginInterface object>, context={u'is_admin': True, u'operation': u'READALL', u'roles': [u'admin'], u'tenant': u'a929311426664f5899862c311a13e4a6', u'tenant_id': u'a929311426664f5899862c311a13e4a6', u'type': u'port', u'user_id': u'1cdd0ebf37e84849b23909dec43ba7b1'}, port={u'fields': [], u'filters': {u'device_id': [u'9516c312-eed0-4cb5-ac39-395912344798']}})
  433 try:
  434 cfgdb = self._get_user_cfgdb(context)
  435 ports_info = cfgdb.port_list(context, filters)
  436 return json.dumps(ports_info)
  437 except Exception as e:
ports_info undefined
cfgdb = <vnc_openstack.neutron_plugin_db.DBInterface object>
cfgdb.port_list = <bound method DBInterface.port_list of <vnc_openstack.neutron_plugin_db.DBInterface object>>
context = {u'is_admin': True, u'operation': u'READALL', u'roles': [u'admin'], u'tenant': u'a929311426664f5899862c311a13e4a6', u'tenant_id': u'a929311426664f5899862c311a13e4a6', u'type': u'port', u'user_id': u'1cdd0ebf37e84849b23909dec43ba7b1'}
filters = {u'device_id': [u'9516c312-eed0-4cb5-ac39-395912344798']}

 /usr/lib/python2.7/dist-packages/vnc_openstack/neutron_plugin_db.py in port_list(self=<vnc_openstack.neutron_plugin_db.DBInterface object>, context={u'is_admin': True, u'operation': u'READALL', u'roles': [u'admin'], u'tenant': u'a929311426664f5899862c311a13e4a6', u'tenant_id': u'a929311426664f5899862c311a13e4a6', u'type': u'port', u'user_id': u'1cdd0ebf37e84849b23909dec43ba7b1'}, filters={u'device_id': [u'9516c312-eed0-4cb5-ac39-395912344798']})
 3659 # port has a back_ref to LR, so need to read in LRs based on device id
 3660 device_ids = filters['device_id']
 3661 router_objs = self._logical_router_list(obj_uuids=device_ids)
 3662 more_ports = []
 3663 for router_obj in router_objs:
router_objs undefined
self = <vnc_openstack.neutron_plugin_db.DBInterface object>
self._logical_router_list = <bound method DBInterface._logical_router_list o..._openstack.neutron_plugin_db.DBInterface object>>
obj_uuids undefined
device_ids = [u'9516c312-eed0-4cb5-ac39-395912344798']

 /usr/lib/python2.7/dist-packages/vnc_openstack/neutron_plugin_db.py in _logical_router_list(self=<vnc_openstack.neutron_plugin_db.DBInterface object>, parent_id=None, back_ref_id=None, obj_uuids=[u'9516c312-eed0-4cb5-ac39-395912344798'], fields=None)
  543 obj_uuids=obj_uuids,
  544 detail=True,
  545 fields=fields)
  546 return rtr_obj
  547 #end _logical_router_list
fields = None

 /usr/lib/python2.7/dist-packages/vnc_api/gen/vnc_api_client_gen.py in logical_routers_list(self=<vnc_api.vnc_api.VncApi object>, parent_id=None, parent_fq_name=None, back_ref_id=None, obj_uuids=[u'9516c312-eed0-4cb5-ac39-395912344798'], fields=None, detail=True, count=False)
 6824 content = self._request_server(rest.OP_GET,
 6825 vnc_api.gen.resource_client.LogicalRouter.create_uri,
 6826 data = query_params)
 6827
 6828 if not detail:
data undefined
query_params = {'count': False, 'detail': True, 'obj_uuids': u'9516c312-eed0-4cb5-ac39-395912344798'}

 /usr/lib/python2.7/dist-packages/vnc_api/vnc_api.py in _request_server(self=<vnc_api.vnc_api.VncApi object>, op=2, url=u'/logical-routers', data={'count': False, 'detail': True, 'obj_uuids': u'9516c312-eed0-4cb5-ac39-395912344798'}, retry_on_error=True, retry_after_authn=False, retry_count=30)
  361 return self._request(op, url, data=data, retry_on_error=retry_on_error,
  362 retry_after_authn=retry_after_authn,
  363 retry_count=retry_count)
  364
  365 def _request(self, op, url, data=None, retry_on_error=True,
retry_count = 30

 /usr/lib/python2.7/dist-packages/vnc_api/vnc_api.py in _request(self=<vnc_api.vnc_api.VncApi object>, op=2, url=u'/logical-routers', data={'count': False, 'detail': True, 'obj_uuids': u'9516c312-eed0-4cb5-ac39-395912344798'}, retry_on_error=True, retry_after_authn=False, retry_count=30)
  402 elif status == 404:
  403 raise NoIdError('Error: oper %s url %s body %s response %s'
  404 % (op, url, data, content))
  405 elif status == 403:
  406 raise PermissionDenied(content)
op = 2
url = u'/logical-routers'
data = {'count': False, 'detail': True, 'obj_uuids': u'9516c312-eed0-4cb5-ac39-395912344798'}
content = u'Unknown id: 9516c312-eed0-4cb5-ac39-395912344798'
<class 'cfgm_common.exceptions.NoIdError'>: Unknown id: Error: oper 2 url /logical-routers body {'count': False, 'obj_uuids': u'9516c312-eed0-4cb5-ac39-395912344798', 'detail': True} response Unknown id: 9516c312-eed0-4cb5-ac39-395912344798
    __class__ = <class 'cfgm_common.exceptions.NoIdError'>
    __delattr__ = <method-wrapper '__delattr__' of NoIdError object>
    __dict__ = {'_unknown_id': u"Error: oper 2 url /logical-routers body {'coun...Unknown id: 9516c312-eed0-4cb5-ac39-395912344798"}
    __doc__ = None
    __format__ = <built-in method __format__ of NoIdError object>
    __getattribute__ = <method-wrapper '__getattribute__' of NoIdError object>
    __getitem__ = <method-wrapper '__getitem__' of NoIdError object>
    __getslice__ = <method-wrapper '__getslice__' of NoIdError object>
    __hash__ = <method-wrapper '__hash__' of NoIdError object>
    __init__ = <bound method NoIdError.__init__ of NoIdError()>
    __module__ = 'cfgm_common.exceptions'
    __new__ = <built-in method __new__ of type object>
    __reduce__ = <built-in method __reduce__ of NoIdError object>
    __reduce_ex__ = <built-in method __reduce_ex__ of NoIdError object>
    __repr__ = <method-wrapper '__repr__' of NoIdError object>
    __setattr__ = <method-wrapper '__setattr__' of NoIdError object>
    __setstate__ = <built-in method __setstate__ of NoIdError object>
    __sizeof__ = <built-in method __sizeof__ of NoIdError object>
    __str__ = <bound method NoIdError.__str__ of NoIdError()>
    __subclasshook__ = <built-in method __subclasshook__ of type object>
    __unicode__ = <built-in method __unicode__ of NoIdError object>
    __weakref__ = None
    _unknown_id = u"Error: oper 2 url /logical-routers body {'coun...Unknown id: 9516c312-eed0-4cb5-ac39-395912344798"
    args = ()
    message = ''

The above is a description of an error in a Python program. Here is
the original traceback:

Traceback (most recent call last):
  File "/usr/lib/python2.7/dist-packages/vnc_openstack/neutron_plugin_interface.py", line 435, in plugin_get_ports
    ports_info = cfgdb.port_list(context, filters)
  File "/usr/lib/python2.7/dist-packages/vnc_openstack/neutron_plugin_db.py", line 3661, in port_list
    router_objs = self._logical_router_list(obj_uuids=device_ids)
  File "/usr/lib/python2.7/dist-packages/vnc_openstack/neutron_plugin_db.py", line 545, in _logical_router_list
    fields=fields)
  File "/usr/lib/python2.7/dist-packages/vnc_api/gen/vnc_api_client_gen.py", line 6826, in logical_routers_list
    data = query_params)
  File "/usr/lib/python2.7/dist-packages/vnc_api/vnc_api.py", line 363, in _request_server
    retry_count=retry_count)
  File "/usr/lib/python2.7/dist-packages/vnc_api/vnc_api.py", line 404, in _request
    % (op, url, data, content))
NoIdError: Unknown id: Error: oper 2 url /logical-routers body {'count': False, 'obj_uuids': u'9516c312-eed0-4cb5-ac39-395912344798', 'detail': True} response Unknown id: 9516c312-eed0-4cb5-ac39-395912344798

Traceback (most recent call last):
  File "/usr/lib/python2.7/dist-packages/bottle.py", line 764, in _handle
    return route.call(**args)
  File "/usr/lib/python2.7/dist-packages/bottle.py", line 1625, in wrapper
    rv = callback(*a, **ka)
  File "/usr/lib/python2.7/dist-packages/bottle.py", line 1575, in wrapper
    rv = callback(*a, **ka)
  File "/usr/lib/python2.7/dist-packages/vnc_openstack/neutron_plugin_interface.py", line 473, in plugin_http_post_port
    return self.plugin_get_ports(context, port)
  File "/usr/lib/python2.7/dist-packages/vnc_openstack/neutron_plugin_interface.py", line 439, in plugin_get_ports
    raise e
NoIdError: Unknown id: Error: oper 2 url /logical-routers body {'count': False, 'obj_uuids': u'9516c312-eed0-4cb5-ac39-395912344798', 'detail': True} response Unknown id: 9516c312-eed0-4cb5-ac39-395912344798

neutron/server.log
===============

2015-03-18 09:24:35.908 ERROR [neutron.api.v2.resource] index failed
Traceback (most recent call last):
  File "/usr/lib/python2.7/dist-packages/neutron/api/v2/resource.py", line 84, in resource
    result = method(request=request, **args)
  File "/usr/lib/python2.7/dist-packages/neutron/api/v2/base.py", line 273, in index
    return self._items(request, True, parent_id)
  File "/usr/lib/python2.7/dist-packages/neutron/api/v2/base.py", line 227, in _items
    obj_list = obj_getter(request.context, **kwargs)
  File "/usr/lib/python2.7/dist-packages/neutron_plugin_contrail/plugins/opencontrail/contrail_plugin.py", line 528, in get_ports
    for p in self._list_resource('port', context, filters, fields)]
  File "/usr/lib/python2.7/dist-packages/neutron_plugin_contrail/plugins/opencontrail/contrail_plugin.py", line 324, in _list_resource
    fields=fields, obj_name=res_type)
  File "/usr/lib/python2.7/dist-packages/neutron_plugin_contrail/plugins/opencontrail/contrail_plugin.py", line 233, in _transform_response
    self._raise_contrail_error(info, obj_name)
  File "/usr/lib/python2.7/dist-packages/neutron_plugin_contrail/plugins/opencontrail/contrail_plugin.py", line 248, in _raise_contrail_error
    raise exc.NeutronException(**info)
NeutronException: An unknown exception occurred.

nova/nova-api.log
==============
2015-03-18 09:24:30.829 6525 INFO nova.osapi_compute.wsgi.server [req-ec8a107c-8058-418d-881a-c2da75c1e617 1cdd0ebf37e84849b23909dec43ba7b1 a929311426664f5899862c311a13e4a6] 192.168.0.101 "DELETE /v1.1/a929311426664f5899862c311a13e4a6/servers/9516c312-eed0-4cb5-ac39-395912344798 HTTP/1.1" status: 204 len: 179 time: 0.1509612

2015-03-18 09:24:35.911 6525 ERROR nova.api.openstack [req-afdbfca5-9c3c-4a82-b5ca-c5edc87c33a9 1cdd0ebf37e84849b23909dec43ba7b1 a929311426664f5899862c311a13e4a6] Caught error: 500-{u'NeutronError': {u'message': u'An unknown exception occurred.', u'type': u'NeutronException', u'detail': u''}}
2015-03-18 09:24:35.911 6525 TRACE nova.api.openstack Traceback (most recent call last):
2015-03-18 09:24:35.911 6525 TRACE nova.api.openstack File "/usr/lib/python2.7/dist-packages/nova/api/openstack/__init__.py", line 119, in __call__
2015-03-18 09:24:35.911 6525 TRACE nova.api.openstack return req.get_response(self.application)
2015-03-18 09:24:35.911 6525 TRACE nova.api.openstack File "/usr/local/lib/python2.7/dist-packages/webob/request.py", line 1320, in send
2015-03-18 09:24:35.911 6525 TRACE nova.api.openstack application, catch_exc_info=False)
2015-03-18 09:24:35.911 6525 TRACE nova.api.openstack File "/usr/local/lib/python2.7/dist-packages/webob/request.py", line 1284, in call_application
2015-03-18 09:24:35.911 6525 TRACE nova.api.openstack app_iter = application(self.environ, start_response)
2015-03-18 09:24:35.911 6525 TRACE nova.api.openstack File "/usr/local/lib/python2.7/dist-packages/webob/dec.py", line 144, in __call__
2015-03-18 09:24:35.911 6525 TRACE nova.api.openstack return resp(environ, start_response)
2015-03-18 09:24:35.911 6525 TRACE nova.api.openstack File "/usr/lib/python2.7/dist-packages/keystoneclient/middleware/auth_token.py", line 539, in __call__
2015-03-18 09:24:35.911 6525 TRACE nova.api.openstack return self.app(env, start_response)
2015-03-18 09:24:35.911 6525 TRACE nova.api.openstack File "/usr/local/lib/python2.7/dist-packages/webob/dec.py", line 144, in __call__
2015-03-18 09:24:35.911 6525 TRACE nova.api.openstack return resp(environ, start_response)
2015-03-18 09:24:35.911 6525 TRACE nova.api.openstack File "/usr/local/lib/python2.7/dist-packages/webob/dec.py", line 144, in __call__
2015-03-18 09:24:35.911 6525 TRACE nova.api.openstack return resp(environ, start_response)
2015-03-18 09:24:35.911 6525 TRACE nova.api.openstack File "/usr/lib/python2.7/dist-packages/routes/middleware.py", line 131, in __call__
2015-03-18 09:24:35.911 6525 TRACE nova.api.openstack response = self.app(environ, start_response)
2015-03-18 09:24:35.911 6525 TRACE nova.api.openstack File "/usr/local/lib/python2.7/dist-packages/webob/dec.py", line 144, in __call__
2015-03-18 09:24:35.911 6525 TRACE nova.api.openstack return resp(environ, start_response)
2015-03-18 09:24:35.911 6525 TRACE nova.api.openstack File "/usr/local/lib/python2.7/dist-packages/webob/dec.py", line 130, in __call__
2015-03-18 09:24:35.911 6525 TRACE nova.api.openstack resp = self.call_func(req, *args, **self.kwargs)
2015-03-18 09:24:35.911 6525 TRACE nova.api.openstack File "/usr/local/lib/python2.7/dist-packages/webob/dec.py", line 195, in call_func
2015-03-18 09:24:35.911 6525 TRACE nova.api.openstack return self.func(req, *args, **kwargs)
2015-03-18 09:24:35.911 6525 TRACE nova.api.openstack File "/usr/lib/python2.7/dist-packages/nova/api/openstack/wsgi.py", line 917, in __call__
2015-03-18 09:24:35.911 6525 TRACE nova.api.openstack content_type, body, accept)
2015-03-18 09:24:35.911 6525 TRACE nova.api.openstack File "/usr/lib/python2.7/dist-packages/nova/api/openstack/wsgi.py", line 1002, in _process_stack
2015-03-18 09:24:35.911 6525 TRACE nova.api.openstack request, action_args)
2015-03-18 09:24:35.911 6525 TRACE nova.api.openstack File "/usr/lib/python2.7/dist-packages/nova/api/openstack/wsgi.py", line 890, in post_process_extensions
2015-03-18 09:24:35.911 6525 TRACE nova.api.openstack **action_args)
2015-03-18 09:24:35.911 6525 TRACE nova.api.openstack File "/usr/lib/python2.7/dist-packages/nova/api/openstack/compute/contrib/security_groups.py", line 583, in detail
2015-03-18 09:24:35.911 6525 TRACE nova.api.openstack self._extend_servers(req, list(resp_obj.obj['servers']))
2015-03-18 09:24:35.911 6525 TRACE nova.api.openstack File "/usr/lib/python2.7/dist-packages/nova/api/openstack/compute/contrib/security_groups.py", line 527, in _extend_servers
2015-03-18 09:24:35.911 6525 TRACE nova.api.openstack servers[0]['id']))
2015-03-18 09:24:35.911 6525 TRACE nova.api.openstack File "/usr/lib/python2.7/dist-packages/nova/network/security_group/neutron_driver.py", line 321, in get_instance_security_groups
2015-03-18 09:24:35.911 6525 TRACE nova.api.openstack ports = neutron.list_ports(**params)
2015-03-18 09:24:35.911 6525 TRACE nova.api.openstack File "/usr/lib/python2.7/dist-packages/neutronclient/v2_0/client.py", line 108, in with_params
2015-03-18 09:24:35.911 6525 TRACE nova.api.openstack ret = self.function(instance, *args, **kwargs)
2015-03-18 09:24:35.911 6525 TRACE nova.api.openstack File "/usr/lib/python2.7/dist-packages/neutronclient/v2_0/client.py", line 306, in list_ports
2015-03-18 09:24:35.911 6525 TRACE nova.api.openstack **_params)
2015-03-18 09:24:35.911 6525 TRACE nova.api.openstack File "/usr/lib/python2.7/dist-packages/neutronclient/v2_0/client.py", line 1343, in list
2015-03-18 09:24:35.911 6525 TRACE nova.api.openstack for r in self._pagination(collection, path, **params):
2015-03-18 09:24:35.911 6525 TRACE nova.api.openstack File "/usr/lib/python2.7/dist-packages/neutronclient/v2_0/client.py", line 1356, in _pagination
2015-03-18 09:24:35.911 6525 TRACE nova.api.openstack res = self.get(path, params=params)
2015-03-18 09:24:35.911 6525 TRACE nova.api.openstack File "/usr/lib/python2.7/dist-packages/neutronclient/v2_0/client.py", line 1329, in get
2015-03-18 09:24:35.911 6525 TRACE nova.api.openstack headers=headers, params=params)
2015-03-18 09:24:35.911 6525 TRACE nova.api.openstack File "/usr/lib/python2.7/dist-packages/neutronclient/v2_0/client.py", line 1314, in retry_request
2015-03-18 09:24:35.911 6525 TRACE nova.api.openstack headers=headers, params=params)
2015-03-18 09:24:35.911 6525 TRACE nova.api.openstack File "/usr/lib/python2.7/dist-packages/neutronclient/v2_0/client.py", line 1257, in do_request
2015-03-18 09:24:35.911 6525 TRACE nova.api.openstack self._handle_fault_response(status_code, replybody)
2015-03-18 09:24:35.911 6525 TRACE nova.api.openstack File "/usr/lib/python2.7/dist-packages/neutronclient/v2_0/client.py", line 1227, in _handle_fault_response
2015-03-18 09:24:35.911 6525 TRACE nova.api.openstack exception_handler_v20(status_code, des_error_body)
2015-03-18 09:24:35.911 6525 TRACE nova.api.openstack File "/usr/lib/python2.7/dist-packages/neutronclient/v2_0/client.py", line 93, in exception_handler_v20
2015-03-18 09:24:35.911 6525 TRACE nova.api.openstack message=msg)
2015-03-18 09:24:35.911 6525 TRACE nova.api.openstack NeutronClientException: 500-{u'NeutronError': {u'message': u'An unknown exception occurred.', u'type': u'NeutronException', u'detail': u''}}
2015-03-18 09:24:35.911 6525 TRACE nova.api.openstack
2015-03-18 09:24:35.917 6525 INFO nova.api.openstack [req-afdbfca5-9c3c-4a82-b5ca-c5edc87c33a9 1cdd0ebf37e84849b23909dec43ba7b1 a929311426664f5899862c311a13e4a6] http://192.168.0.101:8774/v1.1/a929311426664f5899862c311a13e4a6/servers/detail?all_tenants=True returned with HTTP 500
2015-03-18 09:24:35.919 6525 INFO nova.osapi_compute.wsgi.server [req-afdbfca5-9c3c-4a82-b5ca-c5edc87c33a9 1cdd0ebf37e84849b23909dec43ba7b1 a929311426664f5899862c311a13e4a6] 192.168.0.101 "GET /v1.1/a929311426664f5899862c311a13e4a6/servers/detail?all_tenants=True HTTP/1.1" status: 500 len: 335 time: 0.0688860

[OpenContrail Admin (ci-admin-f)]

Review in progress for https://review.opencontrail.org/8479
Submitter: Prakash Bailkeri (<email address hidden>)

[OpenContrail Admin (ci-admin-f)]

Review in progress for https://review.opencontrail.org/8492
Submitter: Prakash Bailkeri (<email address hidden>)

[OpenContrail Admin (ci-admin-f)]

Reviewed: https://review.opencontrail.org/8479
Committed: http://github.org/Juniper/contrail-generateDS/commit/0a09abea3cfaf48bdc974c4d28464038f8bf2cf2
Submitter: Zuul
Branch: master

commit 0a09abea3cfaf48bdc974c4d28464038f8bf2cf2
Author: Prakash Bailkeri <email address hidden>
Date: Thu Mar 19 04:36:53 2015 -0700

Return empty list from bulk get API.

while reading the db with dbe_read_multi() if the uuid is deleted in between,
api return NoIdError for list request. NoIdError for list is improper and it should
return empty list
Also note, if the uuid to read request is invalid or non existing, API returns empty
list
Fix is to return Empty List from such read request
Closes-Bug: 1433983

Change-Id: I88956f395aa5085f1f215b85c6dd5d5ec46a6fba

[OpenContrail Admin (ci-admin-f)]

Reviewed: https://review.opencontrail.org/8492
Committed: http://github.org/Juniper/contrail-generateDS/commit/c06045bc06291aba4a42c746ada5dd5222432ece
Submitter: Zuul
Branch: R2.1

commit c06045bc06291aba4a42c746ada5dd5222432ece
Author: Prakash Bailkeri <email address hidden>
Date: Thu Mar 19 04:36:53 2015 -0700

Return empty list from bulk get API.

while reading the db with dbe_read_multi() if the uuid is deleted in between,
api return NoIdError for list request. NoIdError for list is improper and it should
return empty list
Also note, if the uuid to read request is invalid or non existing, API returns empty
list
Fix is to return Empty List from such read request
Closes-Bug: 1433983

Change-Id: I88956f395aa5085f1f215b85c6dd5d5ec46a6fba

[OpenContrail Admin (ci-admin-f)]

Review in progress for https://review.opencontrail.org/11563
Submitter: Sachin Bansal (<email address hidden>)

[OpenContrail Admin (ci-admin-f)]

Reviewed: https://review.opencontrail.org/11563
Committed: http://github.org/Juniper/contrail-generateDS/commit/0c96060264871cdc9220b10f2dccbb59bfbc8315
Submitter: Zuul
Branch: R2.0

commit 0c96060264871cdc9220b10f2dccbb59bfbc8315
Author: Prakash Bailkeri <email address hidden>
Date: Thu Mar 19 04:36:53 2015 -0700

Return empty list from bulk get API.

while reading the db with dbe_read_multi() if the uuid is deleted in between,
api return NoIdError for list request. NoIdError for list is improper and it should
return empty list
Also note, if the uuid to read request is invalid or non existing, API returns empty
list
Fix is to return Empty List from such read request
Closes-Bug: 1433983

Change-Id: I88956f395aa5085f1f215b85c6dd5d5ec46a6fba