本文整理汇总了Python中cassandra.policies.DowngradingConsistencyRetryPolicy类的典型用法代码示例。如果您正苦于以下问题：Python DowngradingConsistencyRetryPolicy类的具体用法？Python DowngradingConsistencyRetryPolicy怎么用？Python DowngradingConsistencyRetryPolicy使用的例子？那么, 这里精选的类代码示例或许可以为您提供帮助。
在下文中一共展示了DowngradingConsistencyRetryPolicy类的4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_write_timeout
def test_write_timeout(self):
policy = DowngradingConsistencyRetryPolicy()
# if this is the second or greater attempt, rethrow
retry, consistency = policy.on_write_timeout(
query=None, consistency="ONE", write_type=WriteType.SIMPLE,
required_responses=1, received_responses=2, retry_num=1)
self.assertEqual(retry, RetryPolicy.RETHROW)
# ignore failures on these types of writes
for write_type in (WriteType.SIMPLE, WriteType.BATCH, WriteType.COUNTER):
retry, consistency = policy.on_write_timeout(
query=None, consistency="ONE", write_type=write_type,
required_responses=1, received_responses=2, retry_num=0)
self.assertEqual(retry, RetryPolicy.IGNORE)
# downgrade consistency level on unlogged batch writes
retry, consistency = policy.on_write_timeout(
query=None, consistency="ONE", write_type=WriteType.UNLOGGED_BATCH,
required_responses=3, received_responses=1, retry_num=0)
self.assertEqual(retry, RetryPolicy.RETRY)
self.assertEqual(consistency, ConsistencyLevel.ONE)
# retry batch log writes at the same consistency level
retry, consistency = policy.on_write_timeout(
query=None, consistency="ONE", write_type=WriteType.BATCH_LOG,
required_responses=3, received_responses=1, retry_num=0)
self.assertEqual(retry, RetryPolicy.RETRY)
self.assertEqual(consistency, "ONE")示例2: test_unavailable
def test_unavailable(self):
policy = DowngradingConsistencyRetryPolicy()
# if this is the second or greater attempt, rethrow
retry, consistency = policy.on_unavailable(
query=None, consistency="ONE", required_replicas=3, alive_replicas=1, retry_num=1)
self.assertEqual(retry, RetryPolicy.RETHROW)
# downgrade consistency on unavailable exceptions
retry, consistency = policy.on_unavailable(
query=None, consistency="ONE", required_replicas=3, alive_replicas=1, retry_num=0)
self.assertEqual(retry, RetryPolicy.RETRY)
self.assertEqual(consistency, ConsistencyLevel.ONE)示例3: test_read_timeout
def test_read_timeout(self):
policy = DowngradingConsistencyRetryPolicy()
# if this is the second or greater attempt, rethrow
retry, consistency = policy.on_read_timeout(
query=None, consistency=ONE, required_responses=1, received_responses=2,
data_retrieved=True, retry_num=1)
self.assertEqual(retry, RetryPolicy.RETHROW)
self.assertEqual(consistency, None)
# if we didn't get enough responses, retry at a lower consistency
retry, consistency = policy.on_read_timeout(
query=None, consistency=ONE, required_responses=4, received_responses=3,
data_retrieved=True, retry_num=0)
self.assertEqual(retry, RetryPolicy.RETRY)
self.assertEqual(consistency, ConsistencyLevel.THREE)
# if we didn't get enough responses, retry at a lower consistency
retry, consistency = policy.on_read_timeout(
query=None, consistency=ONE, required_responses=3, received_responses=2,
data_retrieved=True, retry_num=0)
self.assertEqual(retry, RetryPolicy.RETRY)
self.assertEqual(consistency, ConsistencyLevel.TWO)
# retry consistency level goes down based on the # of recv'd responses
retry, consistency = policy.on_read_timeout(
query=None, consistency=ONE, required_responses=3, received_responses=1,
data_retrieved=True, retry_num=0)
self.assertEqual(retry, RetryPolicy.RETRY)
self.assertEqual(consistency, ConsistencyLevel.ONE)
# if we got no responses, rethrow
retry, consistency = policy.on_read_timeout(
query=None, consistency=ONE, required_responses=3, received_responses=0,
data_retrieved=True, retry_num=0)
self.assertEqual(retry, RetryPolicy.RETHROW)
self.assertEqual(consistency, None)
# if we got enough response but no data, retry
retry, consistency = policy.on_read_timeout(
query=None, consistency=ONE, required_responses=3, received_responses=3,
data_retrieved=False, retry_num=0)
self.assertEqual(retry, RetryPolicy.RETRY)
self.assertEqual(consistency, ONE)
# if we got enough responses, but also got a data response, rethrow
retry, consistency = policy.on_read_timeout(
query=None, consistency=ONE, required_responses=2, received_responses=2,
data_retrieved=True, retry_num=0)
self.assertEqual(retry, RetryPolicy.RETHROW)
self.assertEqual(consistency, None)示例4: test_write_timeout
def test_write_timeout(self):
policy = DowngradingConsistencyRetryPolicy()
# if this is the second or greater attempt, rethrow
retry, consistency = policy.on_write_timeout(
query=None, consistency=ONE, write_type=WriteType.SIMPLE,
required_responses=1, received_responses=2, retry_num=1)
self.assertEqual(retry, RetryPolicy.RETHROW)
self.assertEqual(consistency, None)
for write_type in (WriteType.SIMPLE, WriteType.BATCH, WriteType.COUNTER):
# ignore failures if at least one response (replica persisted)
retry, consistency = policy.on_write_timeout(
query=None, consistency=ONE, write_type=write_type,
required_responses=1, received_responses=2, retry_num=0)
self.assertEqual(retry, RetryPolicy.IGNORE)
# retrhow if we can't be sure we have a replica
retry, consistency = policy.on_write_timeout(
query=None, consistency=ONE, write_type=write_type,
required_responses=1, received_responses=0, retry_num=0)
self.assertEqual(retry, RetryPolicy.RETHROW)
# downgrade consistency level on unlogged batch writes
retry, consistency = policy.on_write_timeout(
query=None, consistency=ONE, write_type=WriteType.UNLOGGED_BATCH,
required_responses=3, received_responses=1, retry_num=0)
self.assertEqual(retry, RetryPolicy.RETRY)
self.assertEqual(consistency, ConsistencyLevel.ONE)
# retry batch log writes at the same consistency level
retry, consistency = policy.on_write_timeout(
query=None, consistency=ONE, write_type=WriteType.BATCH_LOG,
required_responses=3, received_responses=1, retry_num=0)
self.assertEqual(retry, RetryPolicy.RETRY)
self.assertEqual(consistency, ONE)
# timeout on an unknown write_type
retry, consistency = policy.on_write_timeout(
query=None, consistency=ONE, write_type=None,
required_responses=1, received_responses=2, retry_num=0)
self.assertEqual(retry, RetryPolicy.RETHROW)
self.assertEqual(consistency, None)