Airflow tasks get stuck at “queued” status and never gets running

Question

I\'m using Airflow v1.8.1 and run all components (worker, web, flower, scheduler) on kubernetes & Docker. I use Celery Executor with Redis and my tasks are looks like:

Answer 1

We have a solution and want to share it here before 1.9 becomes official. Thanks for Bolke de Bruin updates on 1.9. in my situation before 1.9, currently we are using 1.8.1 is to have another DAG running to clear the task in queue state if it stays there for over 30 mins.