def test_distributed_lock(self):
row_event = DistributedLockTestEvent()
self.mech_driver._nb_ovn.idl.notify_handler.watch_event(row_event)
worker_list = [self.mech_driver._nb_ovn, ]
# Create 10 fake workers
for _ in range(10):
node_uuid = uuidutils.generate_uuid()
db_hash_ring.add_node(node_uuid)
fake_driver = mock.MagicMock(node_uuid=node_uuid)
_idl = ovsdb_monitor.OvnNbIdl.from_server(
self.ovsdb_server_mgr.get_ovsdb_connection_path(),
'OVN_Northbound', fake_driver)
worker = self.useFixture(
base.ConnectionFixture(idl=_idl, timeout=10)).connection
worker.idl.notify_handler.watch_event(row_event)
worker.start()
worker_list.append(worker)
# Refresh the hash rings just in case
[worker.idl._hash_ring.refresh() for worker in worker_list]
# Assert we have 11 active workers in the ring
self.assertEqual(
11, len(db_hash_ring.get_active_nodes(
interval=ovn_const.HASH_RING_NODES_TIMEOUT)))
# Trigger the event
self.create_port()
# Wait for the event to complete
self.assertTrue(row_event.wait())
# Assert that only one worker handled the event
self.assertEqual(1, row_event.COUNTER)
def test_get_node(self):
# Use pre-defined UUIDs to make the hashes predictable
node_1_uuid = db_hash_ring.add_node('node-1')
node_2_uuid = db_hash_ring.add_node('node-2')
hash_dict_before = {node_1_uuid: 'fake-uuid',
node_2_uuid: 'fake-uuid-0'}
self._verify_hashes(hash_dict_before)
def test_get_node(self):
# Use pre-defined UUIDs to make the hashes predictable
node_1_uuid = db_hash_ring.add_node(HASH_RING_TEST_GROUP, 'node-1')
node_2_uuid = db_hash_ring.add_node(HASH_RING_TEST_GROUP, 'node-2')
hash_dict_before = {
'fake-uuid': node_1_uuid,
'fake-uuid-0': node_2_uuid
}
self._verify_hashes(hash_dict_before)
def test_ring_rebalance(self):
# Use pre-defined UUIDs to make the hashes predictable
node_1_uuid = db_hash_ring.add_node(HASH_RING_TEST_GROUP, 'node-1')
node_2_uuid = db_hash_ring.add_node(HASH_RING_TEST_GROUP, 'node-2')
# Add another node from a different host
with mock.patch.object(db_hash_ring, 'CONF') as mock_conf:
mock_conf.host = 'another-host-52359446-c366'
another_host_node = db_hash_ring.add_node(HASH_RING_TEST_GROUP,
'another-host')
# Assert all nodes are alive in the ring
self.hash_ring_manager.refresh()
self.assertEqual(3, len(self.hash_ring_manager._hash_ring.nodes))
# Hash certain values against the nodes
hash_dict_before = {
'fake-uuid': node_1_uuid,
'fake-uuid-0': node_2_uuid,
'fake-uuid-ABCDE': another_host_node
}
self._verify_hashes(hash_dict_before)
# Mock utcnow() as the HASH_RING_NODES_TIMEOUT have expired
# already and touch the nodes from our host
fake_utcnow = timeutils.utcnow() - datetime.timedelta(
seconds=constants.HASH_RING_NODES_TIMEOUT)
with mock.patch.object(timeutils, 'utcnow') as mock_utcnow:
mock_utcnow.return_value = fake_utcnow
db_hash_ring.touch_nodes_from_host(HASH_RING_TEST_GROUP)
# Now assert that the ring was re-balanced and only the node from
# another host is marked as alive
self.hash_ring_manager.refresh()
self.assertEqual([another_host_node],
list(self.hash_ring_manager._hash_ring.nodes.keys()))
# Now only "another_host_node" is alive, all values should hash to it
hash_dict_after_rebalance = {
'fake-uuid': another_host_node,
'fake-uuid-0': another_host_node,
'fake-uuid-ABCDE': another_host_node
}
self._verify_hashes(hash_dict_after_rebalance)
# Now touch the nodes so they appear active again
db_hash_ring.touch_nodes_from_host(HASH_RING_TEST_GROUP)
self.hash_ring_manager.refresh()
# The ring should re-balance and as it was before
self._verify_hashes(hash_dict_before)
def _add_nodes_and_assert_exists(self, count=1):
nodes = []
for i in range(count):
node_uuid = db_hash_ring.add_node()
self.assertIsNotNone(self._get_node_row(node_uuid))
nodes.append(node_uuid)
return nodes
def _add_nodes_and_assert_exists(self, count=1,
group_name=HASH_RING_TEST_GROUP):
nodes = []
for i in range(count):
node_uuid = db_hash_ring.add_node(group_name)
self.assertIsNotNone(self._get_node_row(node_uuid))
nodes.append(node_uuid)
return nodes
def test__wait_startup_before_caching(self):
db_hash_ring.add_node('node-1')
db_hash_ring.add_node('node-2')
# Assert it will return True until created_at != updated_at
self.assertTrue(self.hash_ring_manager._wait_startup_before_caching)
self.assertTrue(self.hash_ring_manager._cache_startup_timeout)
# Touch the nodes (== update the updated_at column)
db_hash_ring.touch_nodes_from_host()
# Assert it's now False. Waiting is not needed anymore
self.assertFalse(self.hash_ring_manager._wait_startup_before_caching)
self.assertFalse(self.hash_ring_manager._cache_startup_timeout)
# Now assert that since the _cache_startup_timeout has been
# flipped, we no longer will read from the database
with mock.patch.object(hash_ring_manager.db_hash_ring,
'get_active_nodes') as get_nodes_mock:
self.assertFalse(
self.hash_ring_manager._wait_startup_before_caching)
self.assertFalse(get_nodes_mock.called)
def post_fork_initialize(self, resource, event, trigger, payload=None):
# NOTE(rtheis): This will initialize all workers (API, RPC,
# plugin service and OVN) with OVN IDL connections.
self._post_fork_event.clear()
self._ovn_client_inst = None
is_maintenance = (
utils.get_method_class(trigger) == worker.MaintenanceWorker)
if not is_maintenance:
self.node_uuid = db_hash_ring.add_node(self.hash_ring_group)
self._nb_ovn, self._sb_ovn = impl_idl_ovn.get_ovn_idls(
self, trigger, binding_events=not is_maintenance)
# Override agents API methods
self.patch_plugin_merge("get_agents", get_agents)
self.patch_plugin_choose("get_agent", get_agent)
self.patch_plugin_choose("update_agent", update_agent)
self.patch_plugin_choose("delete_agent", delete_agent)
# Now IDL connections can be safely used.
self._post_fork_event.set()
if is_maintenance:
# Call the synchronization task if its maintenance worker
# This sync neutron DB to OVN-NB DB only in inconsistent states
self.nb_synchronizer = ovn_db_sync.OvnNbSynchronizer(
self._plugin, self._nb_ovn, self._sb_ovn,
config.get_ovn_neutron_sync_mode(), self)
self.nb_synchronizer.sync()
# This sync neutron DB to OVN-SB DB only in inconsistent states
self.sb_synchronizer = ovn_db_sync.OvnSbSynchronizer(
self._plugin, self._sb_ovn, self)
self.sb_synchronizer.sync()
self._maintenance_thread = maintenance.MaintenanceThread()
self._maintenance_thread.add_periodics(
maintenance.DBInconsistenciesPeriodics(self._ovn_client))
self._maintenance_thread.add_periodics(
maintenance.HashRingHealthCheckPeriodics(self.hash_ring_group))
self._maintenance_thread.start()
