How to run rails rake task more frequently than 10 minutes on heroku?

Question

There's a straight forward explanation of why cron jobs and tasked scheduled with whenever gem won't work on heroku

Is there any way to schedule a rake task to run more frequently than every 10 minutes (the minimum frequency heroku scheduler offers), for example every 1 minute?

You could use RabbitMQ and set up a dead letter exchange... – jvillian Nov 02 '20 at 23:48 — jvillian, Nov 02 '20 at 23:48
@jvillian these are both new terms to me. I'll google now! – stevec Nov 02 '20 at 23:49 — stevec, Nov 02 '20 at 23:49

score 1 · Answer 1 · answered Nov 03 '20 at 02:40

You can use a combination of Clockwork gem and Heroku Procfile.

in your lib/clock.rb, you can do something like:

every(1.minute, 'Run task') do
  Rake::Task['namespace:task'].invoke
end

then add clock: bundle exec clockwork lib/clock.rb to your Heroku Procfile

Clockwork supports a lot of time variations.

score 0 · Answer 2 · answered Nov 03 '20 at 07:30

0

I think @ollaollu's method is probably superior, but for future reference what worked for me was to use a Procfile to run an infinite loop on boot, and that effectively runs a process every 5 seconds and even works after heroku restart.

answered Nov 03 '20 at 07:30

stevec

41,291
27
223
311

How to run rails rake task more frequently than 10 minutes on heroku?

2 Answers2