I have submitted this patch: https://github.com/apache/incubator-airflow/pull/3417
I have tested with a Redis celery broker, and with a SQLAlchemy/MySQL celery broker. It works on Redis, and with SQLAlchemy/MySQL. With this patch, I no longer get this exception: File "/usr/lib64/python2.7/site-packages/sqlalchemy/engine/strategies.py", line 160, in create engineclass.__name__)) TypeError: Invalid argument(s) 'ssl_key','ssl_cert','ssl_acti ve','visibility_timeout','ssl_cacert' sent to create_engine(), using configuration MySQLDialect_mysqldb/QueuePool/Engine. Please check that the keyword arguments are appropriate for this combination of components. -- Craig