XD-DENG commented on issue #4673: [AIRFLOW-3851] ExternalTasksensor not check existence in later poke URL: https://github.com/apache/airflow/pull/4673#issuecomment-462010289 One case to consider: what if the external DAG that I’m listening to is removed/modified after I have done my first existence check? I think it’s making more sense to check existence in each poking.
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