execution_delta应该是去查找的上游的任务实例的执行时间与当前实例执行时间的时间差
: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依赖(DAG依赖链路梳理)DAG在执行之前,往往存在很多依赖,需要按顺序进行执行下去。Airflow的Sensor(传感器)可用于保持在一段时间间隔内处于执行中,当满足条件时执行成功,当超时时执行失败...