def _set_serial_consistency_level(self, serial_consistency_level):
if (serial_consistency_level is not None and
not ConsistencyLevel.is_serial(serial_consistency_level)):
raise ValueError(
"serial_consistency_level must be either ConsistencyLevel.SERIAL "
"or ConsistencyLevel.LOCAL_SERIAL")
self._serial_consistency_level = serial_consistency_level
def _set_serial_consistency_level(self, serial_consistency_level):
if (serial_consistency_level is not None and
not ConsistencyLevel.is_serial(serial_consistency_level)):
raise ValueError(
"serial_consistency_level must be either ConsistencyLevel.SERIAL "
"or ConsistencyLevel.LOCAL_SERIAL")
self._serial_consistency_level = serial_consistency_level
def on_unavailable(self, query, consistency, required_replicas, alive_replicas, retry_num):
if retry_num != 0:
return self.RETHROW, None
elif ConsistencyLevel.is_serial(consistency):
# failed at the paxos phase of a LWT, retry on the next host
return self.RETRY_NEXT_HOST, None
else:
return self._pick_consistency(alive_replicas)
def on_read_timeout(self, query, consistency, required_responses,
received_responses, data_retrieved, retry_num):
if retry_num != 0:
return self.RETHROW, None
elif ConsistencyLevel.is_serial(consistency):
# Downgrading does not make sense for a CAS read query
return self.RETHROW, None
elif received_responses < required_responses:
return self._pick_consistency(received_responses)
elif not data_retrieved:
return self.RETRY, consistency
else:
return self.RETHROW, None