def test_statement_keyspace(self): hosts = [Host(str(i), SimpleConvictionPolicy) for i in range(4)] for host in hosts: host.set_up() cluster = Mock(spec=Cluster) cluster.metadata = Mock(spec=Metadata) replicas = hosts[2:] cluster.metadata.get_replicas.return_value = replicas child_policy = Mock() child_policy.make_query_plan.return_value = hosts child_policy.distance.return_value = HostDistance.LOCAL policy = TokenAwarePolicy(child_policy) policy.populate(cluster, hosts) # no keyspace, child policy is called keyspace = None routing_key = 'routing_key' query = Statement(routing_key=routing_key) qplan = list(policy.make_query_plan(keyspace, query)) self.assertEqual(hosts, qplan) self.assertEqual(cluster.metadata.get_replicas.call_count, 0) child_policy.make_query_plan.assert_called_once_with(keyspace, query) # working keyspace, no statement cluster.metadata.get_replicas.reset_mock() keyspace = 'working_keyspace' routing_key = 'routing_key' query = Statement(routing_key=routing_key) qplan = list(policy.make_query_plan(keyspace, query)) self.assertEqual(replicas + hosts[:2], qplan) cluster.metadata.get_replicas.assert_called_with(keyspace, routing_key) # statement keyspace, no working cluster.metadata.get_replicas.reset_mock() working_keyspace = None statement_keyspace = 'statement_keyspace' routing_key = 'routing_key' query = Statement(routing_key=routing_key, keyspace=statement_keyspace) qplan = list(policy.make_query_plan(working_keyspace, query)) self.assertEqual(replicas + hosts[:2], qplan) cluster.metadata.get_replicas.assert_called_with( statement_keyspace, routing_key) # both keyspaces set, statement keyspace used for routing cluster.metadata.get_replicas.reset_mock() working_keyspace = 'working_keyspace' statement_keyspace = 'statement_keyspace' routing_key = 'routing_key' query = Statement(routing_key=routing_key, keyspace=statement_keyspace) qplan = list(policy.make_query_plan(working_keyspace, query)) self.assertEqual(replicas + hosts[:2], qplan) cluster.metadata.get_replicas.assert_called_with( statement_keyspace, routing_key)
def test_wrap_round_robin(self): cluster = Mock(spec=Cluster) cluster.metadata = Mock(spec=Metadata) hosts = [Host(str(i), SimpleConvictionPolicy) for i in range(4)] def get_replicas(keyspace, packed_key): index = struct.unpack('>i', packed_key)[0] return list(islice(cycle(hosts), index, index + 2)) cluster.metadata.get_replicas.side_effect = get_replicas policy = TokenAwarePolicy(RoundRobinPolicy()) policy.populate(cluster, hosts) for i in range(4): query = Statement(routing_key=struct.pack('>i', i)) qplan = list(policy.make_query_plan(None, query)) replicas = get_replicas(None, struct.pack('>i', i)) other = set(h for h in hosts if h not in replicas) self.assertEquals(replicas, qplan[:2]) self.assertEquals(other, set(qplan[2:])) # Should use the secondary policy for i in range(4): qplan = list(policy.make_query_plan()) self.assertEquals(set(qplan), set(hosts))
def test_wrap_dc_aware(self): cluster = Mock(spec=Cluster) cluster.metadata = Mock(spec=Metadata) hosts = [Host(str(i), SimpleConvictionPolicy) for i in range(4)] for host in hosts: host.set_up() for h in hosts[:2]: h.set_location_info("dc1", "rack1") for h in hosts[2:]: h.set_location_info("dc2", "rack1") def get_replicas(keyspace, packed_key): index = struct.unpack('>i', packed_key)[0] # return one node from each DC if index % 2 == 0: return [hosts[0], hosts[2]] else: return [hosts[1], hosts[3]] cluster.metadata.get_replicas.side_effect = get_replicas policy = TokenAwarePolicy( DCAwareRoundRobinPolicy("dc1", used_hosts_per_remote_dc=1)) policy.populate(cluster, hosts) for i in range(4): query = Statement(routing_key=struct.pack('>i', i), keyspace='keyspace_name') qplan = list(policy.make_query_plan(None, query)) replicas = get_replicas(None, struct.pack('>i', i)) # first should be the only local replica self.assertIn(qplan[0], replicas) self.assertEqual(qplan[0].datacenter, "dc1") # then the local non-replica self.assertNotIn(qplan[1], replicas) self.assertEqual(qplan[1].datacenter, "dc1") # then one of the remotes (used_hosts_per_remote_dc is 1, so we # shouldn't see two remotes) self.assertEqual(qplan[2].datacenter, "dc2") self.assertEqual(3, len(qplan))