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When a rescue worker is stuck on Heroku (Cedar stack Rails 3.1), spinning up workers increment the total number of workers available but not the number of workers busy.
To clean that up you should be able to unregister workers on the console.
I’d typically go into the console, get the misbehaving >worker and call “unregister_worker” on the instance. It >looks like you might also be able to simply call the >Resque::Worker#prune_dead_workers class method. >Class here: >https://github.com/defunkt/resque/blob/master/lib/resque>/worker.rb