Basically we need a long term solution for https://issues.apache.org/jira/browse/AIRFLOW-74 . Using SequentialExecutor is a workaround, however it slows down execution of subdags.
Looking for a better solution.
I also see that when running subdags, db connection pools are not shared either (since they are separate processes), which causes db disconnection issues like https://issues.apache.org/jira/browse/AIRFLOW-2340 on our db because there can be too many connections. I hope it can be fixed too when subdag operator works with pooling..