rq
Que
rq | Que | |
---|---|---|
27 | 10 | |
9,559 | 2,290 | |
1.2% | 0.3% | |
8.6 | 5.6 | |
13 days ago | 25 days ago | |
Python | Ruby | |
GNU General Public License v3.0 or later | MIT License |
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rq
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Redis Re-Implemented with SQLite
That's pretty cool. Reckon it would work with existing code that calls Redis over the wire for RQ?
https://python-rq.org
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The Many Problems with Celery
https://github.com/rq/rq is to the rescue.
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Keep the Monolith, but Split the Workloads
We use RQ[0], it has Redis as a dependency. It’s pretty straightforward and we’re very happy with it. If you are using Django you may want to look at Django RQ[1] as well. RQ has built in scheduling capabilities these days, but historically it did not so we used (and still use) RQ Scheduler[2] which I think still has some advantages over the built in stuff.
[0] https://python-rq.org/
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SQL Maxis: Why We Ditched RabbitMQ and Replaced It with a Postgres Queue
Also had a similar experience using RabbitMQ with Django+Celery. Extremely complicated and workers/queues would just stop for no reason.
Moved to Python-RQ [1] + Redis and been rock solid for years now.
[1] https://python-rq.org/
- Ask HN: Redis Queue Hacks and Questions
- What libraries do you use the most alongside django?
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Recommendations other than celery to send an API processing in background, which would only take 5 mins to process and API usage would be once a month or so.
Yep, rq is simple and good: https://python-rq.org/ It also has a Django wrapper: https://github.com/rq/django-rq
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GPU instance crashes when two python processes use the same pt file
We have a GPU (G5) instance that uses Python RQ (https://python-rq.org/).
- Dynamically update periodic tasks in Celery and Django
- Celery + RabbitMQ alternatives
Que
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Choose Postgres Queue Technology
> Can you define "low throughput"?
<1000 messages per minute
Not saying SKIP LOCKED can't work with that many. But you'll probably want to do something better.
FWIW, Que uses advisory locks [1]
[1] https://github.com/que-rb/que
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Introducing tobox: a transactional outbox framework
Probably worth mentioning that aside from delayed_job there are at least two more modern alternatives backed by the DB: Que and good_job.
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Sidekiq jobs in ActiveRecord transactions
Good article. Sidekiq is a good, well respected too. However if you are starting out I would recommend not using it, and instead choosing a DB based queue system. We have great success with que, but there are others like good_job.
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SQL Maxis: Why We Ditched RabbitMQ and Replaced It with a Postgres Queue
(not sure why this comment was dead, I vouched for it)
There are a lot of ways to implement a queue in an RDBMS and a lot of those ways are naive to locking behavior. That said, with PostgreSQL specifically, there are some techniques that result in an efficient queue without locking problems. The article doesn't really talk about their implementation so we can't know what they did, but one open source example is Que[1]. Que uses a combination of advisory locking rather than row-level locks and notification channels to great effect, as you can read in the README.
[1]: https://github.com/que-rb/que
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Delayed Job vs. Sidekiq: Which Is Better?
https://github.com/que-rb/que
This one seems to be the most performant. By a lot too, from my understanding (haven't ran any benchmark myself, but the readme shows some good postgres knowledge)
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Sidekiq VS Que - a user suggested alternative
2 projects | 3 Feb 2022
Que seems like a good alternative if one doesn't want to use Reids. However, given that most apps need Redis (and have it within their infrastructure) nowadays, I still think that Sidekiq is the better option in the generic case.
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Devious SQL: Message Queuing Using Native PostgreSQL
Implementations that use advisory locks like https://github.com/que-rb/que are much more efficient (atleast when I last tested) and will easily reach 10k job/s on even very modest hardware.
There is a Go port of Que but you can also easily port it to any language you like. I have a currently non-OSS implementation in Rust that I might OSS someday when I have time to clean it up.
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Postgres is a great pub/sub and job server
It’s also possible to use advisory locks to implement a job queue in Postgres. See e.g. Que[1]. Note there are a fair number of corner cases, so studying Que is wise if trying to implement something like this, as well as some (a bit older) elaboration[2].
We implemented a similar design to Que for a specific use case in our application that has a known low volume of jobs and for a variety of reasons benefits from this design over other solutions.
[1]: https://github.com/que-rb/que
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Ruby Schedulers: Whenever vs Sidekiq Cron vs Sidekiq Scheduler
Do also take into consideration que-scheduler (disclaimer, am author). It is built on top of the robust que async job system.
What are some alternatives?
celery - Distributed Task Queue (development branch)
Sidekiq - Simple, efficient background processing for Ruby
huey - a little task queue for python
good_job - Multithreaded, Postgres-based, Active Job backend for Ruby on Rails.
RabbitMQ - Open source RabbitMQ: core server and tier 1 (built-in) plugins
Delayed::Job - Database based asynchronous priority queue system -- Extracted from Shopify
mrq - Mr. Queue - A distributed worker task queue in Python using Redis & gevent
Resque - Resque is a Redis-backed Ruby library for creating background jobs, placing them on multiple queues, and processing them later.
procrastinate - PostgreSQL-based Task Queue for Python
Karafka - Ruby and Rails efficient multithreaded Kafka processing framework
Apache Kafka - Mirror of Apache Kafka
Shoryuken - A super efficient Amazon SQS thread based message processor for Ruby