Asynchronous job queues with python-rq
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A short presentation of Redis Queue (python-rq.org) and integrating it with Python/Django. Watch the presentation here: https://www.youtube.com/watch?v=-WGMgFcnolw
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In December 2017, Roblox’s network was managed in a traditional way without automation.
To sustained its growth, the team had to deploy 2 datacenters, a global network and multiple point of presence around the world in few months, the only solution to be able to achieve that was to automate everything.
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How we got started and how we automated an existing network.
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How we got started and how we automated an existing network.
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[1]: http://www.lua.org/wshop13.html
[2]: https://github.com/ignacio/lua_workshop_2013
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***
This slide was shared at Tech in Asia Product Development Conference 2017 (PDC'17) on 9-10 August 2017.
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みなさんこんにちはこれ何文字まで入るの？40文字以下不可とか本当に意味わからないけどこれ限界文字数書いてないからマジでやばい文字数いけるんじゃないの？えこ...
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Asynchronous job queues with python-rq
- 2. Outline ● Asynchronous job queuing ● Redis ● Redis Queue (RQ) ● django-rq
- 3. AboutMe ● Computer Engineering graduate from Pulchowk Campus ● Runs a Python shop called Thoplo ● Does a lot of Python/Django ● Uses far too many exec statements ● ashishacharya.com ● Not a designer
- 4. WhyAsynchronousJobQueues? ● Some problems take too long to solve within a single process ● Web applications need to provide an immediate response ● Sending emails, processing images, making API calls, etc. can take time ● So background processes and job queues
- 5. ToolsforparallelisminPython ● Celery ● IPython.parallel ● Parallel Python ● pymq ● snakeMQ ● Redis Queue
- 6. ChallengeswithCelery ● Lots of one-off configuration ● Difficult and time-consuming to set up ● Difficult to get right - lots of moving parts that can fail ● Time consuming to monitor and maintain ● Needs right kind of storage mechanism with the right kind of message queues
- 7. MainProblemwithCelery It’s OVERKILL for MOST web projects!
- 8. IntroducingRedisQueue ● RQ (Redis Queue) is a simple Python library for queueing jobs and processing them in the background with workers. ● Has a low barrier to entry. ● Has been created as a lightweight alternative to existing queueing frameworks.
- 9. WhyRedisQueue? ● Can get it up and running in an afternoon ● No configuration file editing -- or very little ● Don’t have to configure a message broker -- just uses Redis
- 10. AboutRedis A server that lets you associate a data structure with a key ● Written in C ● Bindings in most popular languages ● Easy to access from Python ● Used extensively for caching in web applications ● I know almost nothing about it.
- 11. AboutRedis import redis connection = redis.Redis(‘localhost’) connection.set(‘key’, ‘value’) print(connection.get(‘key’))
- 12. doesRedisQueueuseRedis?Duh! A Python module for treating Redis like a queue ● Pure Python ● Provides a clean, well thought out API for humans
- 13. ASimpleExample from redis import Redis from rq import Queue import time q = Queue(connection=Redis()) job = q.enqueue(‘operator.add’, 2, 3) time.sleep(1) print(job.result)
- 15. ...This Monitoring on a web interface: rq-dashboard
- 16. ...AlsoThis:django-rq ● Django integration with RQ ● Define queues in settings.py ● Add some urls ● Done! You can start queuing jobs immediately.
- 17. Django-rq ● Enqueue jobs like so: import django_rq django_rq.enqueue(func, foo, bar=baz) ● Has a @job decorator like Celery’s @task ● Has management commands for rqworker and rqscheduler python manage.py rqworker high default low python manage.py rqscheduler
- 19. ● Procrastinate digitally...schedule a job for later. ● Send spam daily...and other periodic tasks ...AndThis:rq-scheduler
- 20. ...andfinally If you’re already using Redis for caching, you can use the same connection information and reap the benefits of optimization. “Two birds, one Redis.” -- A.A
- 22. Demo
- 23. Tips Break jobs down into atomic packages that don’t do anything else. At a point when this doesn’t work for you anymore, it’s definitely time to upgrade to a more powerful, more complex tool -- Celery. (Or just hire someone to do it for you!)
- 24. Questions?