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test_control_connection.py
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589 lines (491 loc) · 26.7 KB
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# Copyright DataStax, Inc.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
import unittest
import six
from concurrent.futures import ThreadPoolExecutor
from mock import Mock, ANY, call
from cassandra import OperationTimedOut, SchemaTargetType, SchemaChangeType
from cassandra.protocol import ResultMessage, RESULT_KIND_ROWS
from cassandra.cluster import ControlConnection, _Scheduler, ProfileManager, EXEC_PROFILE_DEFAULT, ExecutionProfile
from cassandra.pool import Host
from cassandra.connection import EndPoint, DefaultEndPoint, DefaultEndPointFactory
from cassandra.policies import (SimpleConvictionPolicy, RoundRobinPolicy,
ConstantReconnectionPolicy, IdentityTranslator)
PEER_IP = "foobar"
class MockMetadata(object):
def __init__(self):
self.hosts = {
DefaultEndPoint("192.168.1.0"): Host(DefaultEndPoint("192.168.1.0"), SimpleConvictionPolicy),
DefaultEndPoint("192.168.1.1"): Host(DefaultEndPoint("192.168.1.1"), SimpleConvictionPolicy),
DefaultEndPoint("192.168.1.2"): Host(DefaultEndPoint("192.168.1.2"), SimpleConvictionPolicy)
}
for host in self.hosts.values():
host.set_up()
host.release_version = "3.11"
self.cluster_name = None
self.partitioner = None
self.token_map = {}
def get_host(self, endpoint_or_address, port=None):
if not isinstance(endpoint_or_address, EndPoint):
for host in six.itervalues(self.hosts):
if (host.address == endpoint_or_address and
(port is None or host.broadcast_rpc_port is None or host.broadcast_rpc_port == port)):
return host
else:
return self.hosts.get(endpoint_or_address)
def all_hosts(self):
return self.hosts.values()
def rebuild_token_map(self, partitioner, token_map):
self.partitioner = partitioner
self.token_map = token_map
class MockCluster(object):
max_schema_agreement_wait = 5
profile_manager = ProfileManager()
reconnection_policy = ConstantReconnectionPolicy(2)
address_translator = IdentityTranslator()
down_host = None
contact_points = []
is_shutdown = False
def __init__(self):
self.metadata = MockMetadata()
self.added_hosts = []
self.removed_hosts = []
self.scheduler = Mock(spec=_Scheduler)
self.executor = Mock(spec=ThreadPoolExecutor)
self.profile_manager.profiles[EXEC_PROFILE_DEFAULT] = ExecutionProfile(RoundRobinPolicy())
self.endpoint_factory = DefaultEndPointFactory().configure(self)
def add_host(self, endpoint, datacenter, rack, signal=False, refresh_nodes=True):
host = Host(endpoint, SimpleConvictionPolicy, datacenter, rack)
self.added_hosts.append(host)
return host, True
def remove_host(self, host):
self.removed_hosts.append(host)
def on_up(self, host):
pass
def on_down(self, host, is_host_addition):
self.down_host = host
def _node_meta_results(local_results, peer_results):
"""
creates a pair of ResultMessages from (col_names, parsed_rows)
"""
local_response = ResultMessage(kind=RESULT_KIND_ROWS)
local_response.column_names = local_results[0]
local_response.parsed_rows = local_results[1]
peer_response = ResultMessage(kind=RESULT_KIND_ROWS)
peer_response.column_names = peer_results[0]
peer_response.parsed_rows = peer_results[1]
return peer_response, local_response
class MockConnection(object):
is_defunct = False
def __init__(self):
self.endpoint = DefaultEndPoint("192.168.1.0")
self.local_results = [
["schema_version", "cluster_name", "data_center", "rack", "partitioner", "release_version", "tokens"],
[["a", "foocluster", "dc1", "rack1", "Murmur3Partitioner", "2.2.0", ["0", "100", "200"]]]
]
self.peer_results = [
["rpc_address", "peer", "schema_version", "data_center", "rack", "tokens", "host_id"],
[["192.168.1.1", "10.0.0.1", "a", "dc1", "rack1", ["1", "101", "201"], "uuid1"],
["192.168.1.2", "10.0.0.2", "a", "dc1", "rack1", ["2", "102", "202"], "uuid2"]]
]
self.peer_results_v2 = [
["native_address", "native_port", "peer", "peer_port", "schema_version", "data_center", "rack", "tokens", "host_id"],
[["192.168.1.1", 9042, "10.0.0.1", 7042, "a", "dc1", "rack1", ["1", "101", "201"], "uuid1"],
["192.168.1.2", 9042, "10.0.0.2", 7040, "a", "dc1", "rack1", ["2", "102", "202"], "uuid2"]]
]
self.wait_for_responses = Mock(return_value=_node_meta_results(self.local_results, self.peer_results))
class FakeTime(object):
def __init__(self):
self.clock = 0
def time(self):
return self.clock
def sleep(self, amount):
self.clock += amount
class ControlConnectionTest(unittest.TestCase):
_matching_schema_preloaded_results = _node_meta_results(
local_results=(["schema_version", "cluster_name", "data_center", "rack", "partitioner", "release_version", "tokens", "host_id"],
[["a", "foocluster", "dc1", "rack1", "Murmur3Partitioner", "2.2.0", ["0", "100", "200"], "uuid1"]]),
peer_results=(["rpc_address", "peer", "schema_version", "data_center", "rack", "tokens", "host_id"],
[["192.168.1.1", "10.0.0.1", "a", "dc1", "rack1", ["1", "101", "201"], "uuid2"],
["192.168.1.2", "10.0.0.2", "a", "dc1", "rack1", ["2", "102", "202"], "uuid3"]]))
_nonmatching_schema_preloaded_results = _node_meta_results(
local_results=(["schema_version", "cluster_name", "data_center", "rack", "partitioner", "release_version", "tokens", "host_id"],
[["a", "foocluster", "dc1", "rack1", "Murmur3Partitioner", "2.2.0", ["0", "100", "200"], "uuid1"]]),
peer_results=(["rpc_address", "peer", "schema_version", "data_center", "rack", "tokens", "host_id"],
[["192.168.1.1", "10.0.0.1", "a", "dc1", "rack1", ["1", "101", "201"], "uuid2"],
["192.168.1.2", "10.0.0.2", "b", "dc1", "rack1", ["2", "102", "202"], "uuid3"]]))
def setUp(self):
self.cluster = MockCluster()
self.connection = MockConnection()
self.time = FakeTime()
self.control_connection = ControlConnection(self.cluster, 1, 0, 0, 0)
self.control_connection._connection = self.connection
self.control_connection._time = self.time
def test_wait_for_schema_agreement(self):
"""
Basic test with all schema versions agreeing
"""
self.assertTrue(self.control_connection.wait_for_schema_agreement())
# the control connection should not have slept at all
self.assertEqual(self.time.clock, 0)
def test_wait_for_schema_agreement_uses_preloaded_results_if_given(self):
"""
wait_for_schema_agreement uses preloaded results if given for shared table queries
"""
preloaded_results = self._matching_schema_preloaded_results
self.assertTrue(self.control_connection.wait_for_schema_agreement(preloaded_results=preloaded_results))
# the control connection should not have slept at all
self.assertEqual(self.time.clock, 0)
# the connection should not have made any queries if given preloaded results
self.assertEqual(self.connection.wait_for_responses.call_count, 0)
def test_wait_for_schema_agreement_falls_back_to_querying_if_schemas_dont_match_preloaded_result(self):
"""
wait_for_schema_agreement requery if schema does not match using preloaded results
"""
preloaded_results = self._nonmatching_schema_preloaded_results
self.assertTrue(self.control_connection.wait_for_schema_agreement(preloaded_results=preloaded_results))
# the control connection should not have slept at all
self.assertEqual(self.time.clock, 0)
self.assertEqual(self.connection.wait_for_responses.call_count, 1)
def test_wait_for_schema_agreement_fails(self):
"""
Make sure the control connection sleeps and retries
"""
# change the schema version on one node
self.connection.peer_results[1][1][2] = 'b'
self.assertFalse(self.control_connection.wait_for_schema_agreement())
# the control connection should have slept until it hit the limit
self.assertGreaterEqual(self.time.clock, self.cluster.max_schema_agreement_wait)
def test_wait_for_schema_agreement_skipping(self):
"""
If rpc_address or schema_version isn't set, the host should be skipped
"""
# an entry with no schema_version
self.connection.peer_results[1].append(
["192.168.1.3", "10.0.0.3", None, "dc1", "rack1", ["3", "103", "203"]]
)
# an entry with a different schema_version and no rpc_address
self.connection.peer_results[1].append(
[None, None, "b", "dc1", "rack1", ["4", "104", "204"]]
)
# change the schema version on one of the existing entries
self.connection.peer_results[1][1][3] = 'c'
self.cluster.metadata.get_host(DefaultEndPoint('192.168.1.1')).is_up = False
self.assertTrue(self.control_connection.wait_for_schema_agreement())
self.assertEqual(self.time.clock, 0)
def test_wait_for_schema_agreement_rpc_lookup(self):
"""
If the rpc_address is 0.0.0.0, the "peer" column should be used instead.
"""
self.connection.peer_results[1].append(
["0.0.0.0", PEER_IP, "b", "dc1", "rack1", ["3", "103", "203"]]
)
host = Host(DefaultEndPoint("0.0.0.0"), SimpleConvictionPolicy)
self.cluster.metadata.hosts[DefaultEndPoint("foobar")] = host
host.is_up = False
# even though the new host has a different schema version, it's
# marked as down, so the control connection shouldn't care
self.assertTrue(self.control_connection.wait_for_schema_agreement())
self.assertEqual(self.time.clock, 0)
# but once we mark it up, the control connection will care
host.is_up = True
self.assertFalse(self.control_connection.wait_for_schema_agreement())
self.assertGreaterEqual(self.time.clock, self.cluster.max_schema_agreement_wait)
def test_refresh_nodes_and_tokens(self):
self.control_connection.refresh_node_list_and_token_map()
meta = self.cluster.metadata
self.assertEqual(meta.partitioner, 'Murmur3Partitioner')
self.assertEqual(meta.cluster_name, 'foocluster')
# check token map
self.assertEqual(sorted(meta.all_hosts()), sorted(meta.token_map.keys()))
for token_list in meta.token_map.values():
self.assertEqual(3, len(token_list))
# check datacenter/rack
for host in meta.all_hosts():
self.assertEqual(host.datacenter, "dc1")
self.assertEqual(host.rack, "rack1")
self.assertEqual(self.connection.wait_for_responses.call_count, 1)
def test_refresh_nodes_and_tokens_with_invalid_peers(self):
def refresh_and_validate_added_hosts():
self.connection.wait_for_responses = Mock(return_value=_node_meta_results(
self.connection.local_results, self.connection.peer_results))
self.control_connection.refresh_node_list_and_token_map()
self.assertEqual(1, len(self.cluster.added_hosts)) # only one valid peer found
# peersV1
del self.connection.peer_results[:]
self.connection.peer_results.extend([
["rpc_address", "peer", "schema_version", "data_center", "rack", "tokens", "host_id"],
[["192.168.1.3", "10.0.0.1", "a", "dc1", "rack1", ["1", "101", "201"], 'uuid5'],
# all others are invalid
[None, None, "a", "dc1", "rack1", ["1", "101", "201"], 'uuid1'],
["192.168.1.7", "10.0.0.1", "a", None, "rack1", ["1", "101", "201"], 'uuid2'],
["192.168.1.6", "10.0.0.1", "a", "dc1", None, ["1", "101", "201"], 'uuid3'],
["192.168.1.5", "10.0.0.1", "a", "dc1", "rack1", None, 'uuid4'],
["192.168.1.4", "10.0.0.1", "a", "dc1", "rack1", ["1", "101", "201"], None]]])
refresh_and_validate_added_hosts()
# peersV2
del self.cluster.added_hosts[:]
del self.connection.peer_results[:]
self.connection.peer_results.extend([
["native_address", "native_port", "peer", "peer_port", "schema_version", "data_center", "rack", "tokens", "host_id"],
[["192.168.1.4", 9042, "10.0.0.1", 7042, "a", "dc1", "rack1", ["1", "101", "201"], "uuid1"],
# all others are invalid
[None, 9042, None, 7040, "a", "dc1", "rack1", ["2", "102", "202"], "uuid2"],
["192.168.1.5", 9042, "10.0.0.2", 7040, "a", None, "rack1", ["2", "102", "202"], "uuid2"],
["192.168.1.5", 9042, "10.0.0.2", 7040, "a", "dc1", None, ["2", "102", "202"], "uuid2"],
["192.168.1.5", 9042, "10.0.0.2", 7040, "a", "dc1", "rack1", None, "uuid2"],
["192.168.1.5", 9042, "10.0.0.2", 7040, "a", "dc1", "rack1", ["2", "102", "202"], None]]])
refresh_and_validate_added_hosts()
def test_refresh_nodes_and_tokens_uses_preloaded_results_if_given(self):
"""
refresh_nodes_and_tokens uses preloaded results if given for shared table queries
"""
preloaded_results = self._matching_schema_preloaded_results
self.control_connection._refresh_node_list_and_token_map(self.connection, preloaded_results=preloaded_results)
meta = self.cluster.metadata
self.assertEqual(meta.partitioner, 'Murmur3Partitioner')
self.assertEqual(meta.cluster_name, 'foocluster')
# check token map
self.assertEqual(sorted(meta.all_hosts()), sorted(meta.token_map.keys()))
for token_list in meta.token_map.values():
self.assertEqual(3, len(token_list))
# check datacenter/rack
for host in meta.all_hosts():
self.assertEqual(host.datacenter, "dc1")
self.assertEqual(host.rack, "rack1")
# the connection should not have made any queries if given preloaded results
self.assertEqual(self.connection.wait_for_responses.call_count, 0)
def test_refresh_nodes_and_tokens_no_partitioner(self):
"""
Test handling of an unknown partitioner.
"""
# set the partitioner column to None
self.connection.local_results[1][0][4] = None
self.control_connection.refresh_node_list_and_token_map()
meta = self.cluster.metadata
self.assertEqual(meta.partitioner, None)
self.assertEqual(meta.token_map, {})
def test_refresh_nodes_and_tokens_add_host(self):
self.connection.peer_results[1].append(
["192.168.1.3", "10.0.0.3", "a", "dc1", "rack1", ["3", "103", "203"], "uuid3"]
)
self.cluster.scheduler.schedule = lambda delay, f, *args, **kwargs: f(*args, **kwargs)
self.control_connection.refresh_node_list_and_token_map()
self.assertEqual(1, len(self.cluster.added_hosts))
self.assertEqual(self.cluster.added_hosts[0].address, "192.168.1.3")
self.assertEqual(self.cluster.added_hosts[0].datacenter, "dc1")
self.assertEqual(self.cluster.added_hosts[0].rack, "rack1")
self.assertEqual(self.cluster.added_hosts[0].host_id, "uuid3")
def test_refresh_nodes_and_tokens_remove_host(self):
del self.connection.peer_results[1][1]
self.control_connection.refresh_node_list_and_token_map()
self.assertEqual(1, len(self.cluster.removed_hosts))
self.assertEqual(self.cluster.removed_hosts[0].address, "192.168.1.2")
def test_refresh_nodes_and_tokens_timeout(self):
def bad_wait_for_responses(*args, **kwargs):
self.assertEqual(kwargs['timeout'], self.control_connection._timeout)
raise OperationTimedOut()
self.connection.wait_for_responses = bad_wait_for_responses
self.control_connection.refresh_node_list_and_token_map()
self.cluster.executor.submit.assert_called_with(self.control_connection._reconnect)
def test_refresh_schema_timeout(self):
def bad_wait_for_responses(*args, **kwargs):
self.time.sleep(kwargs['timeout'])
raise OperationTimedOut()
self.connection.wait_for_responses = Mock(side_effect=bad_wait_for_responses)
self.control_connection.refresh_schema()
self.assertEqual(self.connection.wait_for_responses.call_count, self.cluster.max_schema_agreement_wait / self.control_connection._timeout)
self.assertEqual(self.connection.wait_for_responses.call_args[1]['timeout'], self.control_connection._timeout)
def test_handle_topology_change(self):
event = {
'change_type': 'NEW_NODE',
'address': ('1.2.3.4', 9000)
}
self.cluster.scheduler.reset_mock()
self.control_connection._handle_topology_change(event)
self.cluster.scheduler.schedule_unique.assert_called_once_with(ANY, self.control_connection._refresh_nodes_if_not_up, None)
event = {
'change_type': 'REMOVED_NODE',
'address': ('1.2.3.4', 9000)
}
self.cluster.scheduler.reset_mock()
self.control_connection._handle_topology_change(event)
self.cluster.scheduler.schedule_unique.assert_called_once_with(ANY, self.cluster.remove_host, None)
event = {
'change_type': 'MOVED_NODE',
'address': ('1.2.3.4', 9000)
}
self.cluster.scheduler.reset_mock()
self.control_connection._handle_topology_change(event)
self.cluster.scheduler.schedule_unique.assert_called_once_with(ANY, self.control_connection._refresh_nodes_if_not_up, None)
def test_handle_status_change(self):
event = {
'change_type': 'UP',
'address': ('1.2.3.4', 9000)
}
self.cluster.scheduler.reset_mock()
self.control_connection._handle_status_change(event)
self.cluster.scheduler.schedule_unique.assert_called_once_with(ANY, self.control_connection.refresh_node_list_and_token_map)
# do the same with a known Host
event = {
'change_type': 'UP',
'address': ('192.168.1.0', 9042)
}
self.cluster.scheduler.reset_mock()
self.control_connection._handle_status_change(event)
host = self.cluster.metadata.hosts[DefaultEndPoint('192.168.1.0')]
self.cluster.scheduler.schedule_unique.assert_called_once_with(ANY, self.cluster.on_up, host)
self.cluster.scheduler.schedule.reset_mock()
event = {
'change_type': 'DOWN',
'address': ('1.2.3.4', 9000)
}
self.control_connection._handle_status_change(event)
self.assertFalse(self.cluster.scheduler.schedule.called)
# do the same with a known Host
event = {
'change_type': 'DOWN',
'address': ('192.168.1.0', 9000)
}
self.control_connection._handle_status_change(event)
host = self.cluster.metadata.hosts[DefaultEndPoint('192.168.1.0')]
self.assertIs(host, self.cluster.down_host)
def test_handle_schema_change(self):
change_types = [getattr(SchemaChangeType, attr) for attr in vars(SchemaChangeType) if attr[0] != '_']
for change_type in change_types:
event = {
'target_type': SchemaTargetType.TABLE,
'change_type': change_type,
'keyspace': 'ks1',
'table': 'table1'
}
self.cluster.scheduler.reset_mock()
self.control_connection._handle_schema_change(event)
self.cluster.scheduler.schedule_unique.assert_called_once_with(ANY, self.control_connection.refresh_schema, **event)
self.cluster.scheduler.reset_mock()
event['target_type'] = SchemaTargetType.KEYSPACE
del event['table']
self.control_connection._handle_schema_change(event)
self.cluster.scheduler.schedule_unique.assert_called_once_with(ANY, self.control_connection.refresh_schema, **event)
def test_refresh_disabled(self):
cluster = MockCluster()
schema_event = {
'target_type': SchemaTargetType.TABLE,
'change_type': SchemaChangeType.CREATED,
'keyspace': 'ks1',
'table': 'table1'
}
status_event = {
'change_type': 'UP',
'address': ('1.2.3.4', 9000)
}
topo_event = {
'change_type': 'MOVED_NODE',
'address': ('1.2.3.4', 9000)
}
cc_no_schema_refresh = ControlConnection(cluster, 1, -1, 0, 0)
cluster.scheduler.reset_mock()
# no call on schema refresh
cc_no_schema_refresh._handle_schema_change(schema_event)
self.assertFalse(cluster.scheduler.schedule.called)
self.assertFalse(cluster.scheduler.schedule_unique.called)
# topo and status changes as normal
cc_no_schema_refresh._handle_status_change(status_event)
cc_no_schema_refresh._handle_topology_change(topo_event)
cluster.scheduler.schedule_unique.assert_has_calls([call(ANY, cc_no_schema_refresh.refresh_node_list_and_token_map),
call(ANY, cc_no_schema_refresh._refresh_nodes_if_not_up, None)])
cc_no_topo_refresh = ControlConnection(cluster, 1, 0, -1, 0)
cluster.scheduler.reset_mock()
# no call on topo refresh
cc_no_topo_refresh._handle_topology_change(topo_event)
self.assertFalse(cluster.scheduler.schedule.called)
self.assertFalse(cluster.scheduler.schedule_unique.called)
# schema and status change refresh as normal
cc_no_topo_refresh._handle_status_change(status_event)
cc_no_topo_refresh._handle_schema_change(schema_event)
cluster.scheduler.schedule_unique.assert_has_calls([call(ANY, cc_no_topo_refresh.refresh_node_list_and_token_map),
call(0.0, cc_no_topo_refresh.refresh_schema,
**schema_event)])
def test_refresh_nodes_and_tokens_add_host_detects_port(self):
del self.connection.peer_results[:]
self.connection.peer_results.extend(self.connection.peer_results_v2)
self.connection.peer_results[1].append(
["192.168.1.3", 555, "10.0.0.3", 666, "a", "dc1", "rack1", ["3", "103", "203"], "uuid3"]
)
self.connection.wait_for_responses = Mock(return_value=_node_meta_results(
self.connection.local_results, self.connection.peer_results))
self.cluster.scheduler.schedule = lambda delay, f, *args, **kwargs: f(*args, **kwargs)
self.control_connection.refresh_node_list_and_token_map()
self.assertEqual(1, len(self.cluster.added_hosts))
self.assertEqual(self.cluster.added_hosts[0].endpoint.address, "192.168.1.3")
self.assertEqual(self.cluster.added_hosts[0].endpoint.port, 555)
self.assertEqual(self.cluster.added_hosts[0].broadcast_rpc_address, "192.168.1.3")
self.assertEqual(self.cluster.added_hosts[0].broadcast_rpc_port, 555)
self.assertEqual(self.cluster.added_hosts[0].broadcast_address, "10.0.0.3")
self.assertEquals(self.cluster.added_hosts[0].broadcast_port, 666)
self.assertEqual(self.cluster.added_hosts[0].datacenter, "dc1")
self.assertEqual(self.cluster.added_hosts[0].rack, "rack1")
def test_refresh_nodes_and_tokens_add_host_detects_invalid_port(self):
del self.connection.peer_results[:]
self.connection.peer_results.extend(self.connection.peer_results_v2)
self.connection.peer_results[1].append(
["192.168.1.3", -1, "10.0.0.3", 0, "a", "dc1", "rack1", ["3", "103", "203"], "uuid3"]
)
self.connection.wait_for_responses = Mock(return_value=_node_meta_results(
self.connection.local_results, self.connection.peer_results))
self.cluster.scheduler.schedule = lambda delay, f, *args, **kwargs: f(*args, **kwargs)
self.control_connection.refresh_node_list_and_token_map()
self.assertEqual(1, len(self.cluster.added_hosts))
self.assertEqual(self.cluster.added_hosts[0].endpoint.address, "192.168.1.3")
self.assertEqual(self.cluster.added_hosts[0].endpoint.port, 9042) # fallback default
self.assertEqual(self.cluster.added_hosts[0].broadcast_rpc_address, "192.168.1.3")
self.assertEqual(self.cluster.added_hosts[0].broadcast_rpc_port, None)
self.assertEqual(self.cluster.added_hosts[0].broadcast_address, "10.0.0.3")
self.assertEquals(self.cluster.added_hosts[0].broadcast_port, None)
self.assertEqual(self.cluster.added_hosts[0].datacenter, "dc1")
self.assertEqual(self.cluster.added_hosts[0].rack, "rack1")
class EventTimingTest(unittest.TestCase):
"""
A simple test to validate that event scheduling happens in order
Added for PYTHON-358
"""
def setUp(self):
self.cluster = MockCluster()
self.connection = MockConnection()
self.time = FakeTime()
# Use 2 for the schema_event_refresh_window which is what we would normally default to.
self.control_connection = ControlConnection(self.cluster, 1, 2, 0, 0)
self.control_connection._connection = self.connection
self.control_connection._time = self.time
def test_event_delay_timing(self):
"""
Submits a wide array of events make sure that each is scheduled to occur in the order they were received
"""
prior_delay = 0
for _ in range(100):
for change_type in ('CREATED', 'DROPPED', 'UPDATED'):
event = {
'change_type': change_type,
'keyspace': '1',
'table': 'table1'
}
# This is to increment the fake time, we don't actually sleep here.
self.time.sleep(.001)
self.cluster.scheduler.reset_mock()
self.control_connection._handle_schema_change(event)
self.cluster.scheduler.mock_calls
# Grabs the delay parameter from the scheduler invocation
current_delay = self.cluster.scheduler.mock_calls[0][1][0]
self.assertLess(prior_delay, current_delay)
prior_delay = current_delay