jmaldon1 commented on pull request #17405:
URL: https://github.com/apache/airflow/pull/17405#issuecomment-985666459


   @sighingnow @MatrixManAtYrService Looking for an explanation of `clear`.
   
   When is the `clear` method called in the DAG process?
   How are we avoiding the case that we delete the data from the external 
database, but the tasks fails and has to rerun?
   If the task reruns, won't it need to query for the data again, but if we 
deleted it already, then it wont be there anymore.


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