50 lines
1.8 KiB
Python
50 lines
1.8 KiB
Python
# (C) Copyright 2017 SUSE LLC
|
|
#
|
|
# 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.
|
|
|
|
from cassandra.policies import RetryPolicy
|
|
|
|
|
|
class MonascaRetryPolicy(RetryPolicy):
|
|
|
|
def __init__(self, read_attempts, write_attempts, unavailable_attempts):
|
|
|
|
super(MonascaRetryPolicy, self).__init__()
|
|
|
|
self.read_attempts = read_attempts
|
|
self.write_attempts = write_attempts
|
|
self.unavailable_attempts = unavailable_attempts
|
|
|
|
def on_read_timeout(self, query, consistency, required_responses,
|
|
received_responses, data_retrieved, retry_num):
|
|
|
|
if retry_num >= self.read_attempts:
|
|
return self.RETHROW, None
|
|
elif received_responses >= required_responses and not data_retrieved:
|
|
return self.RETRY, consistency
|
|
else:
|
|
return self.RETHROW, None
|
|
|
|
def on_write_timeout(self, query, consistency, write_type,
|
|
required_responses, received_responses, retry_num):
|
|
|
|
if retry_num >= self.write_attempts:
|
|
return self.RETHROW, None
|
|
else:
|
|
return self.RETRY, consistency
|
|
|
|
def on_unavailable(self, query, consistency, required_replicas, alive_replicas, retry_num):
|
|
|
|
return (self.RETRY_NEXT_HOST, consistency) if retry_num < self.unavailable_attempts else (self.RETHROW, None)
|