Airflow：TypeError an integer is required (got type NoneType) 一次诡异问题排查

​ 当使用rabbitmq作为airflow的broker的时候，启动scheduler，即执行airflow scheduler命令的时候抛出以下异常:

Traceback (most recent call last):
  File "/anaconda/anaconda3/bin/airflow", line 27, in 
    args.func(args)
  File "/anaconda/anaconda3/lib/python3.6/site-packages/airflow/bin/cli.py", line 818, in scheduler
    ......
    ......
  File "/anaconda/anaconda3/lib/python3.6/site-packages/kombu/connection.py", line 494, in _ensured
    return fun(*args, **kwargs)
  File "/anaconda/anaconda3/lib/python3.6/site-packages/kombu/messaging.py", line 203, in _publish
    mandatory=mandatory, immediate=immediate,
  File "/anaconda/anaconda3/lib/python3.6/site-packages/librabbitmq/__init__.py", line 122, in basic_publish
    mandatory or False, immediate or False,
TypeError: an integer is required (got type NoneType)

整体环境描述:

pytho