Probably the key (‘_kombu.binding.celery_task‘) has been removed from the Redis database.

一、应用场景

celery 进行多任务多队列操作时，出现的此错误

kombu.exceptions.OperationalError: 
Cannot route message for exchange 'celery_task': Table empty or key no longer exists.
Probably the key ('_kombu.binding.celery_task') has been removed from the Redis database.

二、解决办法

https://github.com/uktrade/data-hub-api/pull/2143

本人的原因

任务队列broker和执行结果backend 均为redis， 然而路由却用了rabbitmq的交换机，所以报错

BROKER_URL = 'redis://:123456@localhost:6379/3'
CELERY_RESULT_BACKEND = 'redis://:123456@localhost:6379/4'

celery路由配错了

CELERY_ROUTES= {
    - 正确
    'celery_practice.semi_auto_task': {'queue': 'celery_task', 'routing_key': 'semi_auto_task', 'priority': 7},
    - 错误
    'celery_practice.semi_auto_task': {'exchange': 'celery_task', 'routing_key': 'semi_auto_task', 'priority': 7},

    }