Delayed jobs are not being picked up by the workers

[maksimf]

Summary:

I have a few hundred tasks, just sitting there, not being picked up by any of the workers. I did check that:

• tasks are in the same queue that the workers are launched for (canvas_queue)
• workers are indeed spawned (via ps aux)

Steps to reproduce:

1. Perform any action which triggers a delayed job, like inviting new user

Expected behavior:

Email is sent

Actual behavior:

Email job is queued, but the task is not picked up by the worker (0/1 attempts)

[maksimf]

I have updated all the stuck jobs with locked_by = 'RANDOM STRING' and locked_at = NOW(), after that I have removed all those jobs and this, somehow, made jobs being picked up again. But I would still want to know why this might have happened

[KarimElagamy]

Hi, I'm running into this same exact issue right now, any chance you could post a more detailed explanation of how you fixed this? Would be much appreciated