Celery: all workers stuck, how to diagnose

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Periodically all my Celery workers get stuck on something. I cannot figure out what is causing this, as inspect doesn't work as all the workers are busy.

  celery inspect active

  Error: No nodes replied within time constraint

Is it possible to get Celery status, like active tasks, even if nodes are doing something (that seems to be causing problems)? Can I somehow spin up a temporary worker just to get inspect output?

What kind of other strategies there would be to diagnose this issue?

Celery 4.x. Redis backend.

asked 2 mins ago

Mikko Ohtamaa

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Celery: all workers stuck, how to diagnose