kaxil commented on pull request #19637:
URL: https://github.com/apache/airflow/pull/19637#issuecomment-971775593


   > I am also +1 on doing it always.
   
   
   Agree when we have incompatibilities -- and we can resync during that 
version is what I feel.
   
   > 
   > I prefer even 10 minutes of resync (which is I guess highly unrealistic to 
take that long on pretty much any upgrade) for every user at upgrade time than 
handling all the issues that people will have in case of any future 
incompatibilities/migration from older versions.
   
   It compounds to 30 mins -- when you account for other DB migrations. The 
larger the number of DAGs, larger the TIs, more time for other migrations and 
more time for re-serialization.


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