Airflow ExternalTaskSensor gets stuck

Question

I\'m trying to use ExternalTaskSensor and it gets stuck at poking another DAG\'s task, which has already been successfully completed.

Here, a first DAG \"a\" complet

Answer 1

As of Airflow v1.10.7, tomcm's answer is not true (at least for this version). One should use execution_delta or execution_date_fn to determine the date AND schedule of the external DAG if they do not have the same schedule.