feng-tao edited a comment on issue #3688: [AIRFLOW-2843] ExternalTaskSensor-check if external task exists URL: https://github.com/apache/airflow/pull/3688#issuecomment-455068969 @XD-DENG agree. I think we should rescan the dag and check whether the task still exists. I can't think of other way to achieve this purpose, but the only concern is whether the operation(check dag) will be heavy or not. But given it is controlled by a flag, I think it is ok.
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