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Fix Celery Tasks That Are Stuck, Never Run or Run Twice

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Self-Hosting & Infra intermediate 7 min read $0.01 Updated 2026-10-19

Debugging Celery: worker and broker connectivity, task discovery and names, queue routing, PENDING state meaning, prefetch multiplier and long tasks, acks_late and duplicate execution, visibility timeout, retries and time limits, beat scheduling and monitoring.

Celery tasks stay PENDING, workers are idle, or jobs execute twice. Check the broker URL, routing and queue names, task registration, prefetch and acks_late, visibility timeouts and result backend.

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#celery#python#task-queue#redis#rabbitmq

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