[GitHub] [airflow] potiuk edited a comment on issue #18665: Deleting and copying DAG file from/to dags directory not triggering the DAG

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potiuk edited a comment on issue #18665:
URL: https://github.com/apache/airflow/issues/18665#issuecomment-932981856


   This is not how Airflow works. The DAG that disappeared and appeared again wiht the same DAG is "the same" DAG. If you want to change the structure of DAG heavily you are supposed to create a new DAG with new DAG_Id and it will have new history.
   
   See the comment here: https://airflow.apache.org/docs/apache-airflow/stable/index.html?highlight=slowly#beyond-the-horizon
   
   > Workflows are expected to be mostly static or slowly changing. You can think of the structure of the tasks in your workflow as slightly more dynamic than a database structure would be. Airflow workflows are expected to look similar from a run to the next, this allows for clarity around unit of work and continuity.
   
   We have a DRAFT "Airlfow Improvement Proposal" to handle DAG versioning  https://cwiki.apache.org/confluence/display/AIRFLOW/AIP-36+DAG+Versioning - but it needs a lot of work and discussion on how DAG versioning should look like in various cases. 


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