potiuk commented on PR #23860:
URL: https://github.com/apache/airflow/pull/23860#issuecomment-1156780878

   > I think in the context of an upgrade, surely reserializing is not going to 
be prohibitively slow, right? Compare with say, adding a column to a large TI 
table? Isn't it roughly equivalent, in time, to just parsing all your dags? And 
generally speaking this should not take a long time.
   
   That was also my impression. Maybe there are some outliers when you have 
REALLY a lot of dags. But we don't even have to reserialize, we just need to 
delete serialized dags from the DB and let DagFileProcessor do the job with 
filling the cache back.


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