69 lines
1.9 KiB
Python
69 lines
1.9 KiB
Python
# 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.
|
|
|
|
r"""
|
|
Zaqar backed by Redis.
|
|
|
|
Redis?
|
|
------
|
|
|
|
Redis is sometimes called a "data structure store" because it makes common
|
|
data structures like hashes, lists, and sets available in shared, in-memory
|
|
storage. Zaqar chose redis because it has strong consistency and its Lua
|
|
scripting allows for semi-complex transactions to be built atop the primitives
|
|
it provides.
|
|
|
|
Supported Features
|
|
------------------
|
|
|
|
- FIFO
|
|
- Claims
|
|
- High Throughput[1]_
|
|
- At-least-once Delivery
|
|
|
|
.. [1] This depends on the backing Redis store performance. For more
|
|
information, see `Redis' benchmarks <http://redis.io/topics/benchmarks>`_.
|
|
|
|
Redis can be used both a storage driver and management driver.
|
|
For the management driver, you need to enable the redis storage options
|
|
in redis.conf. Redis persistent storage supports two ways: RDB and AOF.
|
|
The following is RDB way:
|
|
The configuration is as follows:
|
|
save <seconds> <changes>
|
|
E.g
|
|
save 900 1
|
|
save 300 10
|
|
save 60 10000
|
|
|
|
NOTE: save time, the above means that a changed key interval 900s
|
|
for persistent storage; 10 changed keys 300s for storage;
|
|
10000 changed keys 60s for storage.
|
|
|
|
|
|
Unsupported Features
|
|
--------------------
|
|
|
|
- Durability[2]_
|
|
|
|
.. [2] As an in-memory store, Redis doesn't support the durability guarantees
|
|
the MongoDB or SQLAlchemy backends do.
|
|
|
|
|
|
"""
|
|
|
|
from zaqar.storage.redis import driver
|
|
|
|
# Hoist classes into package namespace
|
|
ControlDriver = driver.ControlDriver
|
|
DataDriver = driver.DataDriver
|