execution_delta應(yīng)該是去查找的上游的任務(wù)實例的執(zhí)行時間與當前實例執(zhí)行時間的時間差
:param execution_delta: time difference with the previous execution to
look at, the default is the same execution_date as the current task.
For yesterday, use [positive!] datetime.timedelta(days=1). Either
execution_delta or execution_date_fn can be passed to
ExternalTaskSensor, but not both.
Airflow中sensor依賴（DAG依賴鏈路梳理）DAG在執(zhí)行之前，往往存在很多依賴，需要按順序進行執(zhí)行下去。Airflow的Sensor（傳感器）可用于保持在一段時間間隔內(nèi)處于執(zhí)行中，當滿足條件時執(zhí)行成功，當超時時執(zhí)行失敗...
