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…up() (#1372)

* cleanup jobs that are not really running due to zombie workers

* remove registry entries for zombie jobs

* return only the job ids on cleanup

* test zombie job cleanup

* format code

* rename variable to explain that second element in tuple is expiry, not score

* remove worker_key

* detect zombie jobs using old heartbeats

* reuse get_expired_job_ids

* set score using current_timestamp

* test idle jobs using stale heartbeats

* extract timeout into variable

* move heartbeats into StartedJobRegistry

* use registry.heartbeat in tests

* remove heartbeats when job removed from StartedJobRegistry

* remove idle and expired jobs from both wip and heartbeats set

* send heartbeat_ttl to registry.add

* typo

* revert everything 😶

* only keep job heartbeats as score (and get rid of job timeouts as scores

* calculate heartbeat_ttl in an overrideable function + override it in SimpleWorker + move storing StartedJobRegistry scores to job.heartbeat()

* set heartbeat to monitoring interval for infinite timeouts

* track elapsed_execution_time as part of worker

* reset current job working time when work on a job is done

* persisting the job working time as part of monitoring

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RQ (Redis Queue) is a simple Python library for queueing jobs and processing them in the background with workers. It is backed by Redis and it is designed to have a low barrier to entry. It should be integrated in your web stack easily.

RQ requires Redis >= 3.0.0.

Build status PyPI Coverage

Full documentation can be found here.

Support RQ

If you find RQ useful, please consider supporting this project via Tidelift.

Getting started

First, run a Redis server, of course:

$ redis-server

To put jobs on queues, you don't have to do anything special, just define your typically lengthy or blocking function:

import requests

def count_words_at_url(url):
    """Just an example function that's called async."""
    resp = requests.get(url)
    return len(resp.text.split())

You do use the excellent requests package, don't you?

Then, create an RQ queue:

from redis import Redis
from rq import Queue

queue = Queue(connection=Redis())

And enqueue the function call:

from my_module import count_words_at_url
job = queue.enqueue(count_words_at_url, '')

Scheduling jobs are also similarly easy:

# Schedule job to run at 9:15, October 10th
job = queue.enqueue_at(datetime(2019, 10, 8, 9, 15), say_hello)

# Schedule job to run in 10 seconds
job = queue.enqueue_in(timedelta(seconds=10), say_hello)

Retrying failed jobs is also supported:

from rq import Retry

# Retry up to 3 times, failed job will be requeued immediately
queue.enqueue(say_hello, retry=Retry(max=3))

# Retry up to 3 times, with configurable intervals between retries
queue.enqueue(say_hello, retry=Retry(max=3, interval=[10, 30, 60]))

For a more complete example, refer to the docs. But this is the essence.

The worker

To start executing enqueued function calls in the background, start a worker from your project's directory:

$ rq worker --with-scheduler
*** Listening for work on default
Got count_words_at_url('') from default
Job result = 818
*** Listening for work on default

That's about it.


Simply use the following command to install the latest released version:

pip install rq

If you want the cutting edge version (that may well be broken), use this:

pip install git+

Related Projects

Check out these below repos which might be useful in your rq based project.

Project history

This project has been inspired by the good parts of Celery, Resque and this snippet, and has been created as a lightweight alternative to the heaviness of Celery or other AMQP-based queueing implementations.