redislock | Simplified distributed locking implementation using Redis | Hashing library
kandi X-RAY | redislock Summary
kandi X-RAY | redislock Summary
Simplified distributed locking implementation using Redis. For more information, please see examples.
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QUESTION
I want to implement RedisLock usning StackExchange.Redis library.
By following this article:
https://www.c-sharpcorner.com/article/creating-distributed-lock-with-redis-in-net-core/
- How do I need to block a Redis stream.
- How do I need to unlock Redis stream. Do I really need to use a script to remove an object from a stream, maybe another programm want to handle current element?
Problem with runing script, but every pass of the loop the programm can't realise the lock but next pass is able to get access to locked stream:
My implementation:
Implementation of RedisLock the same as in article.
ANSWER
Answered 2022-Mar-26 at 23:49I solve my problems with RedisLock implemetation by using LockTake/LockRelease commands.
By following this article: stackoverflow question
QUESTION
- Possibility to run asyncio coroutines.
- Correct celery behavior on exceptions and task retries.
- Possibility to use aioredis lock.
So, how to run async tasks properly to achieve the goal?
What is RuntimeError: await wasn't used with future
(below), how can I fix it?
I have already tried:
1. asgirefasync_to_sync
(from asgiref https://pypi.org/project/asgiref/).
This option makes it possible to run asyncio coroutines, but retries functionality doesn't work.
2. celery-pool-asyncio(https://pypi.org/project/celery-pool-asyncio/)
Same problem as in asgiref. (This option makes it possible to run asyncio coroutines, but retries functionality doesn't work.)
3. write own async to sync decoratorI have performed try to create my own decorator like async_to_sync that runs coroutines threadsafe (asyncio.run_coroutine_threadsafe
), but I have behavior as I described above.
Also I have try asyncio.run()
or asyncio.get_event_loop().run_until_complete()
(and self.retry(...)
) inside celery task. This works well, tasks runs, retries works, but there is incorrect coroutine execution - inside async
function I cannot use aioredis.
Implementation notes:
- start celery command:
celery -A celery_test.celery_app worker -l info -n worker1 -P gevent --concurrency=10 --without-gossip --without-mingle
- celery app:
ANSWER
Answered 2022-Feb-04 at 07:59Maybe it helps. https://github.com/aio-libs/aioredis-py/issues/1273
The main point is:
replace all the calls to get_event_loop to get_running_loop which would remove that Runtime exception when a future is attached to a different loop.
QUESTION
I have created singleton redisson instance in my Java application, which I am using to communicate to redis servers. Now using this redisson instance, I am acquiring a lock which after getting some task done, I am releasing. But after calling unlock method, I still see redis have the lock and other threads are unable to acquire the lock. Below is the code snippet, I am using:
...ANSWER
Answered 2020-Sep-11 at 02:24tryLock returns true if it acquired the lock. So calling lock after is unnecessary, and I think it may be the cause of your problem. The implementation probably expects an even number of lock/unlock and in you case you have one more lock than unlock.
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