Hi all, We have 2 EC2 instances running airflow 1.10.0 apps. As per my understanding there should be only 1 airflow scheduler service running at a given time. However lately we have started to see that mysteriously 2 scheduler processes are running, which ends up causing a deadlock and our Airflow tasks don't run. This ends up giving us an error in the `scheduler.logs` - `Executor reports task instance <TaskInstance: <Task Name> 2019-03-25 09:00:00+00:00 [queued]> finished (success) although the task says its queued. Was the task killed externally?`
To resolve this I go and manually kill the scheduler process by using `kill -9 PID`. The scheduler failover controller takes care of spawning a new scheduler process and all tasks resume running. Has anyone faced this issue? How can I prevent 2 scheduler processes from coming up, and why do they come up since we are not manually issuing a command to bring them up in the first place? Thanks!
