问题
I am using Airflow to schedule batch jobs. I have one DAG (A) that runs every night and another DAG (B) that runs once per month. B depends on A having completed successfully. However B takes a long time to run and so I would like to keep it in a separate DAG to allow better SLA reporting.
How can I make running DAG B dependent on a successful run of DAG A on the same day?
回答1:
You can achieve this behavior using an operator called ExternalTaskSensor. Your task (B1) in DAG(B) will be scheduled and wait for a success on task (A2) in DAG(A)
External Task Sensor documentation
回答2:
It looks like a TriggerDagRunOperator can be used as well, and you can use a python callable to add some logic. As explained here : https://www.linkedin.com/pulse/airflow-lesson-1-triggerdagrunoperator-siddharth-anand
来源：https://stackoverflow.com/questions/38022323/how-to-set-dependencies-between-dags-in-airflow