potiuk commented on pull request #17545:
URL: https://github.com/apache/airflow/pull/17545#issuecomment-897793611


   > @potiuk with AIP-39, won't the isolation change since the concrete 
timetable implementation is now defined in DAG code? I'm not seeing anything 
about decoupling the timetable from the DAG code (e.g. pickling it and 
persisting it in the database).
   
   Not really (at least as far as I understand AIP-39). The "customizable 
schedules/timetable" will not come from the DAGs, but from installed packages 
in the system available at runtime, so while this is the "code", it's not 
provided by "DAG writers" but it will be provided by "DevOps" installing 
Airlfow. This is a huge difference (the DAG code will not be loaded during 
scheduling - the "custom" timetable methods will be simply referred to in the 
dag, but you won't be able to provide a custom method to be used instead. 
@uranusjr @ashb - am I right?


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