本文整理汇总了Python中cassandra.cluster.Cluster.scheduler方法的典型用法代码示例。如果您正苦于以下问题：Python Cluster.scheduler方法的具体用法？Python Cluster.scheduler怎么用？Python Cluster.scheduler使用的例子？那么恭喜您, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类cassandra.cluster.Cluster的用法示例。
在下文中一共展示了Cluster.scheduler方法的1个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的Python代码示例。
示例1: test_heart_beat_timeout
# 需要导入模块: from cassandra.cluster import Cluster [as 别名]
# 或者: from cassandra.cluster.Cluster import scheduler [as 别名]
def test_heart_beat_timeout(self):
"""
Test to ensure the hosts are marked as down after a OTO is received.
Also to ensure this happens within the expected timeout
@since 3.10
@jira_ticket PYTHON-762
@expected_result all the hosts have been marked as down at some point
@test_category metadata
"""
number_of_dcs = 3
nodes_per_dc = 20
query_to_prime = "INSERT INTO test3rf.test (k, v) VALUES (0, 1);"
idle_heartbeat_timeout = 5
idle_heartbeat_interval = 1
start_and_prime_cluster_defaults(number_of_dcs, nodes_per_dc)
listener = TrackDownListener()
executor = ThreadTracker(max_workers=8)
# We need to disable compression since it's not supported in simulacron
cluster = Cluster(compression=False,
idle_heartbeat_interval=idle_heartbeat_interval,
idle_heartbeat_timeout=idle_heartbeat_timeout,
executor_threads=8,
execution_profiles={
EXEC_PROFILE_DEFAULT: ExecutionProfile(load_balancing_policy=RoundRobinPolicy())})
self.addCleanup(cluster.shutdown)
cluster.scheduler.shutdown()
cluster.executor = executor
cluster.scheduler = _Scheduler(executor)
session = cluster.connect(wait_for_all_pools=True)
cluster.register_listener(listener)
log = logging.getLogger()
log.setLevel('CRITICAL')
self.addCleanup(log.setLevel, "DEBUG")
prime_query(query_to_prime, then=NO_THEN)
futures = []
for _ in range(number_of_dcs * nodes_per_dc):
future = session.execute_async(query_to_prime)
futures.append(future)
for f in futures:
f._event.wait()
self.assertIsInstance(f._final_exception, OperationTimedOut)
prime_request(PrimeOptions(then=NO_THEN))
# We allow from some extra time for all the hosts to be to on_down
# The callbacks should start happening after idle_heartbeat_timeout + idle_heartbeat_interval
time.sleep((idle_heartbeat_timeout + idle_heartbeat_interval) * 2.5)
for host in cluster.metadata.all_hosts():
self.assertIn(host, listener.hosts_marked_down)
# In this case HostConnection._replace shouldn't be called
self.assertNotIn("_replace", executor.called_functions)