kaxil commented on pull request #19637:
URL: https://github.com/apache/airflow/pull/19637#issuecomment-971879080


   >I prefer even 10 minutes of resync (which is I guess highly unrealistic to 
take that long on pretty much any upgrade) for every
   
   2.2.0 had a migration that took 30 mins for some users -- so definitely 
"realistic". With the AIPs that are coming through the number of DB migrations 
will just keep on growing that touch TIs, so let's not add additional overhead.
   
   
   @uranusjr I suggest, we add a flag like I suggested in 
https://github.com/apache/airflow/pull/19637#issuecomment-971786164 for users 
who wants to clear serialized DAGs while upgrade but "-1" for forcing it.


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