Description of problem:
Getting HTTP Error 500, while all Controllers are up and containers are healthy. 
It happened after creating snapshots of overcloud nodes (3 controllers, 2 computes) and undercloud, while those nodes were probably disconnected for a short while during snapshot.


Version-Release number of selected component (if applicable):
OSP14   -p 2018-12-07.2


How reproducible:
Many times.

Steps to Reproduce:
1. Install OSP14
2. On the host (not the undercloud), make sure you have enogh disk space to create snapshots. Then run:

for vm in $(virsh list --all --name); do
  virsh snapshot-create-as $vm ${vm}-clean;
done

3. When done (takes several minutes), login undercloud and run simple openstack command on the overcloud:
. overcloudrc
openstack network list 


Actual results:

[stack@undercloud-0 ~]$ openstack server list --all
+--------------------------------------+--------------+--------+------------------------+----------------+------------+
| ID                                   | Name         | Status | Networks               | Image          | Flavor     |
+--------------------------------------+--------------+--------+------------------------+----------------+------------+
| 3b28056e-5329-4997-b381-a5627f18f6e4 | controller-0 | ACTIVE | ctlplane=192.168.24.9  | overcloud-full | controller |
| a5d58994-3875-4b24-a6fb-5c43ba4ed4b2 | controller-1 | ACTIVE | ctlplane=192.168.24.15 | overcloud-full | controller |
| 17464a31-0ddd-467e-a939-f2b18a4d755f | compute-0    | ACTIVE | ctlplane=192.168.24.6  | overcloud-full | compute    |
| a7fa0a19-b120-4855-a1af-31ed52378477 | controller-2 | ACTIVE | ctlplane=192.168.24.13 | overcloud-full | controller |
| cc0fff87-6135-4a0c-a21d-d2e08d580e4f | compute-1    | ACTIVE | ctlplane=192.168.24.14 | overcloud-full | compute    |
+--------------------------------------+--------------+--------+------------------------+----------------+------------+

[stack@undercloud-0 ~]$ . overcloudrc

(overcloud) [stack@undercloud-0 ~]$ openstack server list --all
An unexpected error prevented the server from fulfilling your request. (HTTP 500) (Request-ID: req-88bcd414-2b9c-48e1-8c33-6c391783a4a2)

# Controller-1 - Containers logs:

*** controller-1: /var/log/containers/ceilometer/central.log ***
2018-12-11 09:34:35.773 27 ERROR root Traceback (most recent call last):
2018-12-11 09:34:35.773 27 ERROR root   File "/usr/lib/python2.7/site-packages/tooz/coordination.py", line 187, in _beat_forever_until_stopped
2018-12-11 09:35:30.361 27 DEBUG novaclient.v2.client [-] RESP: [200] Content-Length: 15 Content-Type: application/json Date: Tue, 11 Dec 2018 09:35:27 GMT OpenStack-API-Version: compute 2.1 Server: Apache Vary: OpenStack-API-Version,X-OpenStack-Nova-API-Version X-OpenStack-Nova-API-Version: 2.1 x-compute-request-id: req-fb64f31e-2693-42f1-9170-e4e9661e6332 x-openstack-request-id: req-fb64f31e-2693-42f1-9170-e4e9661e6332 _http_log_response /usr/lib/python2.7/site-packages/keystoneauth1/session.py:479
2018-12-11 09:34:35.773 27 ERROR root   File "/usr/lib64/python2.7/contextlib.py", line 35, in __exit__
2018-12-11 09:40:27.242 27 DEBUG novaclient.v2.client [-] GET call to compute for http://172.17.1.16:8774/v2.1/servers/detail?all_tenants=True&changes-since=2018-12-11T09%3A35%3A30.363455%2B00%3A00 used request id req-f7e557e2-d1d7-405e-bb02-ab968072a7fa request /usr/lib/python2.7/site-packages/keystoneauth1/session.py:844
2018-12-11 09:40:27.242 27 ERROR ceilometer.nova_client   File "/usr/lib/python2.7/site-packages/keystoneauth1/adapter.py", line 328, in get
2018-12-11 09:34:35.773 27 ERROR root   File "/usr/lib/python2.7/site-packages/tooz/drivers/redis.py", line 513, in heartbeat
2018-12-11 09:40:27.242 27 ERROR ceilometer.nova_client   File "/usr/lib/python2.7/site-packages/ceilometer/nova_client.py", line 157, in instance_get_all
2018-12-11 09:40:27.242 27 ERROR ceilometer.nova_client   File "/usr/lib/python2.7/site-packages/novaclient/v2/servers.py", line 858, in list
2018-12-11 09:40:27.242 27 ERROR ceilometer.nova_client   File "/usr/lib/python2.7/site-packages/novaclient/base.py", line 257, in _list
<class 'oslo_db.exception.DBConnectionError'> (HTTP 500) (Request-ID: req-f7e557e2-d1d7-405e-bb02-ab968072a7fa): ClientException: Unexpected API Error. Please report this at http://bugs.launchpad.net/nova/ and attach the Nova API log if possible.
2018-12-11 09:34:35.773 27 ERROR root   File "/usr/lib/python2.7/site-packages/six.py", line 718, in raise_from
2018-12-11 09:34:35.773 27 ERROR root   File "/usr/lib/python2.7/site-packages/tooz/utils.py", line 225, in raise_with_cause
2018-12-11 09:40:27.242 27 ERROR ceilometer.nova_client [-] Unexpected API Error. Please report this at http://bugs.launchpad.net/nova/ and attach the Nova API log if possible.
2018-12-11 09:40:27.242 27 ERROR ceilometer.nova_client   File "/usr/lib/python2.7/site-packages/novaclient/client.py", line 83, in request
2018-12-11 09:30:27.233 27 DEBUG ceilometer.polling.manager [-] Skip pollster hardware.memory.buffer, no resources found this cycle poll_and_notify /usr/lib/python2.7/site-packages/ceilometer/polling/manager.py:189
2018-12-11 09:35:07.240 27 ERROR root ToozConnectionError: Error while reading from socket: ('Connection closed by server.',)
2018-12-11 09:34:35.773 27 ERROR root [-] Unexpected exception occurred 1 time(s)... retrying.: ToozConnectionError: Timeout reading from socket
2018-12-11 09:34:35.773 27 ERROR root   File "/usr/lib/python2.7/site-packages/tooz/drivers/redis.py", line 51, in _translate_failures
2018-12-11 09:40:27.241 27 DEBUG novaclient.v2.client [-] RESP BODY: {"computeFault": {"message": "Unexpected API Error. Please report this at http://bugs.launchpad.net/nova/ and attach the Nova API log if possible.\n<class 'oslo_db.exception.DBConnectionError'>", "code": 500}} _http_log_response /usr/lib/python2.7/site-packages/keystoneauth1/session.py:511
2018-12-11 09:40:27.242 27 ERROR ceilometer.nova_client   File "/usr/lib/python2.7/site-packages/ceilometer/nova_client.py", line 39, in with_logging
2018-12-11 09:34:35.773 27 ERROR root   File "/usr/lib/python2.7/site-packages/oslo_utils/excutils.py", line 250, in wrapper
2018-12-11 09:35:27.076 27 DEBUG novaclient.v2.client [-] REQ: curl -g -i -X GET http://172.17.1.16:8774/v2.1/servers/detail?all_tenants=True&changes-since=2018-12-11T09%3A30%3A27.232000%2B00%3A00 -H "Accept: application/json" -H "User-Agent: python-novaclient" -H "X-Auth-Token: {SHA1}68bf8f730717cd4629c7fc56864cce8be86ddfe8" -H "X-OpenStack-Nova-API-Version: 2.1" _http_log_request /usr/lib/python2.7/site-packages/keystoneauth1/session.py:448


*** controller-1: /var/log/containers/aodh/aodh-evaluator.log ***
2018-12-11 09:34:35.224 27 ERROR aodh.evaluator [-] alarm evaluation cycle failed: DBConnectionError: (pymysql.err.OperationalError) (2003, "Can't connect to MySQL server on '172.17.1.16' (timed out)") [SQL: u'SELECT 1'] (Background on this error at: http://sqlalche.me/e/e3q8)
2018-12-11 09:34:24.248 27 ERROR oslo_db.sqlalchemy.engines [-] Database connection was found disconnected; reconnecting: DBConnectionError: (pymysql.err.OperationalError) (2006, "MySQL server has gone away (error(110, 'Connection timed out'))") [SQL: u'SELECT 1'] (Background on this error at: http://sqlalche.me/e/e3q8)


*** controller-1: /var/log/containers/cinder/cinder-scheduler.log ***
2018-12-11 09:38:04.366 1 ERROR oslo.messaging._drivers.impl_rabbit [-] [c9ab9f3a-2845-4cd3-8ba4-a3fd500cec63] AMQP server controller-2.internalapi.localdomain:5672 closed the connection. Check login credentials: Socket closed: IOError: Socket closed
2018-12-11 09:34:36.616 1 ERROR oslo_db.sqlalchemy.engines   File "/usr/lib/python2.7/site-packages/oslo_db/sqlalchemy/engines.py", line 73, in _connect_ping_listener
2018-12-11 09:34:36.616 1 ERROR oslo_db.sqlalchemy.engines [req-bcfd6812-394b-4b68-9d41-62e3d27b7ac3 - - - - -] Database connection was found disconnected; reconnecting: DBConnectionError: (pymysql.err.OperationalError) (2013, 'Lost connection to MySQL server during query') [SQL: u'SELECT 1'] (Background on this error at: http://sqlalche.me/e/e3q8)


*** controller-1: /var/log/containers/heat/heat-engine.log ***
2018-12-11 09:34:38.487 29 ERROR oslo_db.sqlalchemy.engines [req-bfd51c98-1bab-4f4f-9eb0-dd64e7e9e193 - - - - -] Database connection was found disconnected; reconnecting: DBConnectionError: (pymysql.err.OperationalError) (2006, "MySQL server has gone away (error(110, 'Connection timed out'))") [SQL: u'SELECT 1'] (Background on this error at: http://sqlalche.me/e/e3q8)


*** controller-1: /var/log/containers/keystone/keystone.log ***
2018-12-11 09:34:45.068 379 DEBUG keystone.middleware.auth [req-af591093-fed6-494c-b25e-54f007eb6f58 - - - - -] Authenticating user token process_request /usr/lib/python2.7/site-packages/keystonemiddleware/auth_token/__init__.py:401
2018-12-11 09:34:45.081 379 ERROR oslo_db.sqlalchemy.engines   File "/usr/lib/python2.7/site-packages/oslo_db/sqlalchemy/engines.py", line 73, in _connect_ping_listener
2018-12-11 09:34:45.081 379 ERROR oslo_db.sqlalchemy.engines [req-af591093-fed6-494c-b25e-54f007eb6f58 - - - - -] Database connection was found disconnected; reconnecting: DBConnectionError: (pymysql.err.OperationalError) (2006, "MySQL server has gone away (error(110, 'Connection timed out'))") [SQL: u'SELECT 1'] (Background on this error at: http://sqlalche.me/e/e3q8)
2018-12-11 09:34:44.720 380 DEBUG keystone.server.flask.application [req-4f598883-88ce-4cff-abea-db294f493330 - - - - -] Dispatching back to Flask native app. __call__ /usr/lib/python2.7/site-packages/keystone/server/flask/application.py:145


*** controller-1: /var/log/containers/neutron/server.log ***
2018-12-11 06:25:31.058 37 ERROR networking_odl.common.websocket_client   File "/usr/lib/python2.7/site-packages/networking_odl/common/websocket_client.py", line 124, in run_websocket_thread
2018-12-11 06:25:31.062 37 DEBUG networking_odl.common.client [req-6407a99a-227f-4838-ab1d-22969c068727 - - - - -] Sending METHOD (post) URL (http://172.17.1.16:8081/restconf/operations/sal-remote:create-data-change-event-subscription) JSON ({
2018-12-11 06:25:31.061 37 INFO networking_odl.common.websocket_client [req-6407a99a-227f-4838-ab1d-22969c068727 - - - - -] websocket transition to status ODL_WEBSOCKET_DISCONNECTED


*** controller-1: /var/log/containers/neutron/dhcp-agent.log ***
2018-12-11 09:38:04.202 144920 ERROR oslo.messaging._drivers.impl_rabbit [-] [3dcfaa50-9c12-4ef8-9bbf-682977c37092] AMQP server on controller-2.internalapi.localdomain:5672 is unreachable: [Errno 104] Connection reset by peer. Trying again in 1 seconds.: error: [Errno 104] Connection reset by peer
2018-12-11 09:36:24.910 144920 ERROR neutron.agent.dhcp.agent [req-d47e84c0-1e3f-4784-8507-fb2dd90d8f27 - - - - -] Failed reporting state!: MessagingTimeout: Timed out waiting for a reply to message ID ae8e9488964b42d2a59756561074988a


*** controller-1: /var/log/containers/nova/nova-scheduler.log ***
2018-12-11 09:34:34.696 27 ERROR oslo_db.sqlalchemy.engines   File "/usr/lib/python2.7/site-packages/oslo_db/sqlalchemy/engines.py", line 73, in _connect_ping_listener
2018-12-11 09:34:34.696 27 ERROR oslo_db.sqlalchemy.engines [-] Database connection was found disconnected; reconnecting: DBConnectionError: (pymysql.err.OperationalError) (2013, 'Lost connection to MySQL server during query') [SQL: u'SELECT 1'] (Background on this error at: http://sqlalche.me/e/e3q8)


*** controller-1: /var/log/containers/nova/nova-consoleauth.log ***
2018-12-11 09:34:57.384 1 ERROR oslo_db.sqlalchemy.engines [-] Database connection was found disconnected; reconnecting: DBConnectionError: (pymysql.err.OperationalError) (2013, 'Lost connection to MySQL server during query') [SQL: u'SELECT 1'] (Background on this error at: http://sqlalche.me/e/e3q8)


*** controller-1: /var/log/containers/nova/nova-conductor.log ***
2018-12-11 09:34:34.933 26 ERROR oslo_db.sqlalchemy.engines [req-1ec53a36-a8be-4627-ae38-aaebe6a9e308 - - - - -] Database connection was found disconnected; reconnecting: DBConnectionError: (pymysql.err.OperationalError) (2006, "MySQL server has gone away (error(110, 'Connection timed out'))") [SQL: u'SELECT 1'] (Background on this error at: http://sqlalche.me/e/e3q8)


*** controller-1: /var/log/containers/nova/nova-placement-api.log ***
2018-12-11 09:34:46.973 19 INFO nova.api.openstack.placement.requestlog [req-995787b0-be76-40bc-b464-512b65899371 90bc159f62d440afb02ad368c00c3e5c b10d0ac65ffc44a2af3764bf5fd4e61f - default default] 172.17.1.22 "GET /placement/resource_providers?in_tree=fba17869-c4ab-4347-8302-bfda2f47a5db" status: 200 len: 871 microversion: 1.14
2018-12-11 09:34:45.638 19 ERROR oslo_db.sqlalchemy.engines [req-995787b0-be76-40bc-b464-512b65899371 90bc159f62d440afb02ad368c00c3e5c b10d0ac65ffc44a2af3764bf5fd4e61f - default default] Database connection was found disconnected; reconnecting: DBConnectionError: (pymysql.err.OperationalError) (2006, "MySQL server has gone away (error(110, 'Connection timed out'))") [SQL: u'SELECT 1'] (Background on this error at: http://sqlalche.me/e/e3q8)


*** controller-1: /var/log/containers/nova/nova-api.log ***
2018-12-11 09:35:26.959 18 INFO nova.api.openstack.requestlog [req-cbede52d-9156-46ab-8b8c-0eec7814c31e 9648fca4f76f43fbbd80bfb597618988 b10d0ac65ffc44a2af3764bf5fd4e61f - default default] 172.17.1.12 "OPTIONS /" status: 200 len: 411 microversion: - time: 0.001766
2018-12-11 09:35:26.957 18 DEBUG nova.api.openstack.wsgi [req-cbede52d-9156-46ab-8b8c-0eec7814c31e 9648fca4f76f43fbbd80bfb597618988 b10d0ac65ffc44a2af3764bf5fd4e61f - default default] Calling method '<bound method Versions.index of <nova.api.openstack.compute.versions.Versions object at 0x7f32d1003490>>' _process_stack /usr/lib/python2.7/site-packages/nova/api/openstack/wsgi.py:618
2018-12-11 09:35:28.758 21 ERROR oslo_db.sqlalchemy.engines [req-fb64f31e-2693-42f1-9170-e4e9661e6332 9648fca4f76f43fbbd80bfb597618988 b10d0ac65ffc44a2af3764bf5fd4e61f - default default] Database connection was found disconnected; reconnecting: DBConnectionError: (pymysql.err.OperationalError) (2006, "MySQL server has gone away (error(110, 'Connection timed out'))") [SQL: u'SELECT 1'] (Background on this error at: http://sqlalche.me/e/e3q8)
2018-12-11 09:35:29.005 21 DEBUG oslo_concurrency.lockutils [req-fb64f31e-2693-42f1-9170-e4e9661e6332 9648fca4f76f43fbbd80bfb597618988 b10d0ac65ffc44a2af3764bf5fd4e61f - default default] Lock "00000000-0000-0000-0000-000000000000" acquired by "nova.context.get_or_set_cached_cell_and_set_connections" :: waited 0.000s inner /usr/lib/python2.7/site-packages/oslo_concurrency/lockutils.py:273
2018-12-11 09:35:29.053 21 DEBUG oslo_concurrency.lockutils [req-fb64f31e-2693-42f1-9170-e4e9661e6332 9648fca4f76f43fbbd80bfb597618988 b10d0ac65ffc44a2af3764bf5fd4e61f - default default] Lock "363d0e62-0068-4b67-86d4-fef0fb8f42d9" acquired by "nova.context.get_or_set_cached_cell_and_set_connections" :: waited 0.000s inner /usr/lib/python2.7/site-packages/oslo_concurrency/lockutils.py:273
2018-12-11 09:35:28.754 21 DEBUG nova.compute.api [req-fb64f31e-2693-42f1-9170-e4e9661e6332 9648fca4f76f43fbbd80bfb597618988 b10d0ac65ffc44a2af3764bf5fd4e61f - default default] Searching by: {u'changes-since': datetime.datetime(2018, 12, 11, 9, 30, 27, 232000, tzinfo=<FixedOffset u'+00:00' datetime.timedelta(0)>)} get_all /usr/lib/python2.7/site-packages/nova/compute/api.py:2434


*** controller-1: /var/log/containers/opendaylight/karaf/logs/karaf.log ***
2018-12-11T09:38:05,020 | INFO  | opendaylight-cluster-data-shard-dispatcher-80 | Shard                            | 224 - org.opendaylight.controller.sal-clustering-commons - 1.7.4.redhat-7 | Peer address for peer member-2-shard-default-config set to akka.tcp://opendaylight-cluster-data.1.20:2550/user/shardmanager-config/member-2-shard-default-config
2018-12-11T09:36:03,461 | DEBUG | org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.ovsdb.rev150105.OvsdbBridgeAugmentation_AsyncClusteredDataTreeChangeListenerBase-DataTreeChangeHandler-0 | InterfaceTopologyStateListener   | 255 - org.opendaylight.genius.interfacemanager-impl - 0.4.4.redhat-7 | Received Update DataChange Notification for identifier: InstanceIdentifier{targetType=interface org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.ovsdb.rev150105.OvsdbBridgeAugmentation, path=[org.opendaylight.yang.gen.v1.urn.tbd.params.xml.ns.yang.network.topology.rev131021.NetworkTopology, org.opendaylight.yang.gen.v1.urn.tbd.params.xml.ns.yang.network.topology.rev131021.network.topology.Topology[key=TopologyKey [_topologyId=Uri [_value=ovsdb:1]]], org.opendaylight.yang.gen.v1.urn.tbd.params.xml.ns.yang.network.topology.rev131021.network.topology.topology.Node[key=NodeKey [_nodeId=Uri [_value=ovsdb://uuid/a7f01fa4-4def-4a86-99b5-fe432ac8701d/bridge/br-int]]], org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.ovsdb.rev150105.OvsdbBridgeAugmentation]}, ovsdbBridgeAugmentation old: OvsdbBridgeAugmentation{getBridgeExternalIds=[BridgeExternalIds{getBridgeExternalIdKey=opendaylight-iid, getBridgeExternalIdValue=/network-topology:network-topology/network-topology:topology[network-topology:topology-id='ovsdb:1']/network-topology:node[network-topology:node-id='ovsdb://uuid/a7f01fa4-4def-4a86-99b5-fe432ac8701d/bridge/br-int'], augmentations={}}], getBridgeName=OvsdbBridgeName [_value=br-int], getBridgeOpenflowNodeRef=KeyedInstanceIdentifier{targetType=interface org.opendaylight.yang.gen.v1.urn.tbd.params.xml.ns.yang.network.topology.rev131021.network.topology.topology.Node, path=[org.opendaylight.yang.gen.v1.urn.tbd.params.xml.ns.yang.network.topology.rev131021.NetworkTopology, org.opendaylight.yang.gen.v1.urn.tbd.params.xml.ns.yang.network.topology.rev131021.network.topology.Topology[key=TopologyKey [_topologyId=Uri [_value=ovsdb:1]]], org.opendaylight.yang.gen.v1.urn.tbd.params.xml.ns.yang.network.topology.rev131021.network.topology.topology.Node[key=NodeKey [_nodeId=Uri [_value=ovsdb://uuid/a7f01fa4-4def-4a86-99b5-fe432ac8701d]]]]}, getBridgeOtherConfigs=[BridgeOtherConfigs{getBridgeOtherConfigKey=disable-in-band, getBridgeOtherConfigValue=true, augmentations={}}, BridgeOtherConfigs{getBridgeOtherConfigKey=hwaddr, getBridgeOtherConfigValue=c4:e0:0e:29:d0:cf, augmentations={}}], getBridgeUuid=Uuid [_value=a04a3748-2ebf-4974-9027-8d2e9b246c63], getControllerEntry=[ControllerEntry{getControllerUuid=Uuid [_value=d78266bc-a14d-474d-bee3-39fcbff3746a], getTarget=Uri [_value=tcp:172.17.1.20:6653], isIsConnected=true, augmentations={}}, ControllerEntry{getControllerUuid=Uuid [_value=212ed84e-a5eb-4f8b-8542-e080915def50], getTarget=Uri [_value=tcp:172.17.1.12:6653], isIsConnected=true, augmentations={}}, ControllerEntry{getControllerUuid=Uuid [_value=c9827130-669e-4047-b715-7aff22e0b176], getTarget=Uri [_value=tcp:172.17.1.22:6653], isIsConnected=true, augmentations={}}], getDatapathId=DatapathId [_value=00:00:c4:e0:0e:29:d0:cf], getDatapathType=class org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.ovsdb.rev150105.DatapathTypeSystem, getFailMode=class org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.ovsdb.rev150105.OvsdbFailModeSecure, getManagedBy=OvsdbNodeRef [_value=KeyedInstanceIdentifier{targetType=interface org.opendaylight.yang.gen.v1.urn.tbd.params.xml.ns.yang.network.topology.rev131021.network.topology.topology.Node, path=[org.opendaylight.yang.gen.v1.urn.tbd.params.xml.ns.yang.network.topology.rev131021.NetworkTopology, org.opendaylight.yang.gen.v1.urn.tbd.params.xml.ns.yang.network.topology.rev131021.network.topology.Topology[key=TopologyKey [_topologyId=Uri [_value=ovsdb:1]]], org.opendaylight.yang.gen.v1.urn.tbd.params.xml.ns.yang.network.topology.rev131021.network.topology.topology.Node[key=NodeKey [_nodeId=Uri [_value=ovsdb://uuid/a7f01fa4-4def-4a86-99b5-fe432ac8701d]]]]}], getProtocolEntry=[ProtocolEntry{getProtocol=class org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.ovsdb.rev150105.OvsdbBridgeProtocolOpenflow13, augmentations={}}], isStpEnable=false}, new: OvsdbBridgeAugmentation{getBridgeExternalIds=[BridgeExternalIds{getBridgeExternalIdKey=opendaylight-iid, getBridgeExternalIdValue=/network-topology:network-topology/network-topology:topology[network-topology:topology-id='ovsdb:1']/network-topology:node[network-topology:node-id='ovsdb://uuid/a7f01fa4-4def-4a86-99b5-fe432ac8701d/bridge/br-int'], augmentations={}}], getBridgeName=OvsdbBridgeName [_value=br-int], getBridgeOpenflowNodeRef=KeyedInstanceIdentifier{targetType=interface org.opendaylight.yang.gen.v1.urn.tbd.params.xml.ns.yang.network.topology.rev131021.network.topology.topology.Node, path=[org.opendaylight.yang.gen.v1.urn.tbd.params.xml.ns.yang.network.topology.rev131021.NetworkTopology, org.opendaylight.yang.gen.v1.urn.tbd.params.xml.ns.yang.network.topology.rev131021.network.topology.Topology[key=TopologyKey [_topologyId=Uri [_value=ovsdb:1]]], org.opendaylight.yang.gen.v1.urn.tbd.params.xml.ns.yang.network.topology.rev131021.network.topology.topology.Node[key=NodeKey [_nodeId=Uri [_value=ovsdb://uuid/a7f01fa4-4def-4a86-99b5-fe432ac8701d]]]]}, getBridgeOtherConfigs=[BridgeOtherConfigs{getBridgeOtherConfigKey=disable-in-band, getBridgeOtherConfigValue=true, augmentations={}}, BridgeOtherConfigs{getBridgeOtherConfigKey=hwaddr, getBridgeOtherConfigValue=c4:e0:0e:29:d0:cf, augmentations={}}], getBridgeUuid=Uuid [_value=a04a3748-2ebf-4974-9027-8d2e9b246c63], getControllerEntry=[ControllerEntry{getControllerUuid=Uuid [_value=d78266bc-a14d-474d-bee3-39fcbff3746a], getTarget=Uri [_value=tcp:172.17.1.20:6653], isIsConnected=true, augmentations={}}, ControllerEntry{getControllerUuid=Uuid [_value=212ed84e-a5eb-4f8b-8542-e080915def50], getTarget=Uri [_value=tcp:172.17.1.12:6653], isIsConnected=true, augmentations={}}, ControllerEntry{getControllerUuid=Uuid [_value=c9827130-669e-4047-b715-7aff22e0b176], getTarget=Uri [_value=tcp:172.17.1.22:6653], isIsConnected=false, augmentations={}}], getDatapathId=DatapathId [_value=00:00:c4:e0:0e:29:d0:cf], getDatapathType=class org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.ovsdb.rev150105.DatapathTypeSystem, getFailMode=class org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.ovsdb.rev150105.OvsdbFailModeSecure, getManagedBy=OvsdbNodeRef [_value=KeyedInstanceIdentifier{targetType=interface org.opendaylight.yang.gen.v1.urn.tbd.params.xml.ns.yang.network.topology.rev131021.network.topology.topology.Node, path=[org.opendaylight.yang.gen.v1.urn.tbd.params.xml.ns.yang.network.topology.rev131021.NetworkTopology, org.opendaylight.yang.gen.v1.urn.tbd.params.xml.ns.yang.network.topology.rev131021.network.topology.Topology[key=TopologyKey [_topologyId=Uri [_value=ovsdb:1]]], org.opendaylight.yang.gen.v1.urn.tbd.params.xml.ns.yang.network.topology.rev131021.network.topology.topology.Node[key=NodeKey [_nodeId=Uri [_value=ovsdb://uuid/a7f01fa4-4def-4a86-99b5-fe432ac8701d]]]]}], getProtocolEntry=[ProtocolEntry{getProtocol=class org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.ovsdb.rev150105.OvsdbBridgeProtocolOpenflow13, augmentations={}}], isStpEnable=false}.
2018-12-11T09:36:03,461 | DEBUG | org.opendaylight.yang.gen.v1.urn.opendaylight.netvirt.elan.rev150602.elan.dpn.interfaces.elan.dpn.interfaces.list.DpnInterfaces_AsyncClusteredDataTreeChangeListenerBase-DataTreeChangeHandler-0 | ElanDpnInterfaceClusteredListener | 344 - org.opendaylight.netvirt.elanmanager-impl - 0.6.4.redhat-7 | dpninterfaces update fired new size 1
2018-12-11T09:35:47,014 | INFO  | nioEventLoopGroup-9-14 | SystemNotificationsListenerImpl  | 378 - org.opendaylight.openflowplugin.impl - 0.6.4.redhat-7 | ConnectionEvent: Connection closed by device, Device:/172.17.1.22:60912, NodeId:null
2018-12-11T09:38:05,026 | WARN  | nioEventLoopGroup-5-2 | HwvtepConnectionManager          | 391 - org.opendaylight.ovsdb.hwvtepsouthbound-impl - 1.6.4.redhat-7 | HWVTEP disconnected event did not find connection instance for ConnectionInfo [_localIp=IpAddress [_ipv4Address=Ipv4Address [_value=172.17.1.22]], _localPort=PortNumber [_value=6640], _remoteIp=IpAddress [_ipv4Address=Ipv4Address [_value=172.17.1.10]], _remotePort=PortNumber [_value=59000], augmentation=[]]
2018-12-11T09:38:04,967 | ERROR | nioEventLoopGroup-5-2 | ExceptionHandler                 | 392 - org.opendaylight.ovsdb.library - 1.6.4.redhat-7 | Exception occurred while processing connection pipeline
2018-12-11T09:35:47,020 | WARN  | transaction-invoker-impl-0 | OvsdbNodeRemoveCommand           | 396 - org.opendaylight.ovsdb.southbound-impl - 1.6.4.redhat-7 | Failure to delete ovsdbNode
java.util.concurrent.ExecutionException: ReadFailedException{message=Error executeRead ReadData for path /(urn:TBD:params:xml:ns:yang:network-topology?revision=2013-10-21)network-topology/topology/topology[{(urn:TBD:params:xml:ns:yang:network-topology?revision=2013-10-21)topology-id=ovsdb:1}]/node/node[{(urn:TBD:params:xml:ns:yang:network-topology?revision=2013-10-21)node-id=ovsdb://uuid/8b66d92a-9fa9-41b2-8810-7f1890141cfc}], errorList=[RpcError [message=Error executeRead ReadData for path /(urn:TBD:params:xml:ns:yang:network-topology?revision=2013-10-21)network-topology/topology/topology[{(urn:TBD:params:xml:ns:yang:network-topology?revision=2013-10-21)topology-id=ovsdb:1}]/node/node[{(urn:TBD:params:xml:ns:yang:network-topology?revision=2013-10-21)node-id=ovsdb://uuid/8b66d92a-9fa9-41b2-8810-7f1890141cfc}], severity=ERROR, errorType=APPLICATION, tag=operation-failed, applicationTag=null, info=null, cause=java.lang.Exception: Error creating READ_WRITE transaction on shard default]]}


Expected results:
Openstack cli commands should work as expected, and not return error 500

Additional info:
Uploading sos repots.