[rockostrich]

We had a similar DAG that was the result of migration a single daily Luigi pipeline to Airflow. I started identifying isolated branches and breaking them off with external task sensors back to the main DAG. This worked but it's a pain in the ass. My coworker ended up exporting the graph to graphviz and started identifying clusters of related tasks that way.

[mywittyname]

I've not had the best luck with ExternalTaskSensors. There have been some odd errors like execution failing at 22:00:00 every day (despite the external task running fine).