potiuk commented on PR #28999:
URL: https://github.com/apache/airflow/pull/28999#issuecomment-1386164139

   There  are already several people in the 
https://github.com/eventlet/eventlet/issues/781 thanking me (or rather our 
canary builds) for saving them hours of debugging - even though they did not 
have eventlet or dnspython as dependency.
   
   So what I am trying to do here is to save a number of airflow users who will 
install constraints with eventlet failing to import hours of debugging.
   
   This error is very, very specifc and nasty. The problem is that eventlet is 
trying to patch dnspython when importing, and fails. It's not cassandra 
related, it's eventlet + dnspython combination that creates the problem - 
cassandra is only one of many ways how the problem can be triggered.


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