aoen edited a comment on issue #4904: [AIRFLOW-4070] AirflowException -> log.warning for duplicate task dependencies URL: https://github.com/apache/airflow/pull/4904#issuecomment-472127972 I agree that I don't see any risks to this (no need to throw breaking exceptions on no-op). I think maybe the purpose of this could have been immutability, but I don't think there's too much value in the current state, and also without good constructs for copying DAGs it leaves gaps. e.g. to make composable "subdags" (different concept from the SubdagOperator), we need some way of copying the tasks from one DAG to another which is not currently feasible. By "subdags" I mean you have some process or flow encapsulated in a DAG that you want to reuse across several DAGs, currently there is no first-party way to do this. What do you think @XD-DENG ?
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