potiuk commented on issue #17834:
URL: https://github.com/apache/airflow/issues/17834#issuecomment-905831938


   It's not supported because it has "callable" which cannot be serialised.
   
   But FEAR NOUGHT ! @andrewgodwin is working on implementing AIP-40 
(https://cwiki.apache.org/confluence/pages/viewpage.action?pageId=177050929) 
which is a different (and much more comprehensive) approach to this problem 
(and there - as far as I understand it - Any operator (including Python 
Operator) will be possible to be run in "async" mode.
   
   The bad thing - it is going to be available in Airflow 2.2 at the earliest.


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