Hi guys,

I have two tasks in a DAG, t1 and t2. It used to be t2.set_upstream(t1) and
now I want to refactor the logic by setting t1.set_upstream(t2). However,
when I try to run this DAG, it either will try to run two tasks
simultaneously or it will try to run t2 first and towards the end, it will
also run t1 before t2 finishes. I am very confused about this behavior. Am
I missing something here? I am using Airflow 1.8.1.


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