delayed_job queue not being processed on Heroku

Question

I\'m running a Rails 3 app with delayed_job. The issue I\'ve come across is that though the app is correctly adding jobs to the queue, they are never being processed.

Answer 1

In the end, the problem turned out to be a bug in Rake 0.9.0. As Rails depends on Rake, running bundle install after this release of Rake broke my delayed jobs.

The fix is to add gem 'rake', '0.8.7' to your gemfile.

More details can be found below...

DHH's tweet: http://twitter.com/dhh/status/71966528744071169

Discussion in rails_admin's issue tracker: https://github.com/sferik/rails_admin/issues/428

Answer 2

Two options for you:

These two gems watch delayed_jobs queue and automatically 'hires' background workers to process the thread:

• Option 1: https://github.com/michelson/hirefire (This is what I am using because it supports mongoid)
• Option 2: This branch of delayed_job developed by a heroku engineer has a similar autoscale feature: https://github.com/pedro/delayed_job/tree/autoscaling

Good luck

Answer 3

Are you running the delayed_job daemon in the same environment in which the application is running?

Try working the jobs manually using:
rake RAILS_ENV=development jobs:work

If you are running your app in production mode then you need to start delayed_job daemon as:
RAILS_ENV=production script/delayed_job start

Answer 4

This is kinda a long shot but make sure you are using the same Ruby version on Heroku as you are on your local machine. I had a problem with delayed jobs on Heroku before because of this.