potiuk commented on issue #21089:
URL: https://github.com/apache/airflow/issues/21089#issuecomment-1033861621


   This is as intendeed. Alll DAGs are parsed continuously. No matter if they 
changed or not - simply because re-parsing of the dag at different times can 
generate a different DAG (for example if the DAG reads an external file and 
creates DAG structure based on that the DAG might produce a different DAG if 
the external file changes. Same with importing external libraries. 
   
   Time of last modification of the DAG only matters for scheduling priority 
but each DAG will be re-parsed every `min_file_process_interval` seconds. This 
is how Airlfow works currently. 


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