jmaldon1 commented on pull request #19505:
URL: https://github.com/apache/airflow/pull/19505#issuecomment-985752461


   Slightly off-topic but curious to know if anyone can help me out.
   
   When is the `clear` method called in the DAG process?
   How are we avoiding the case that we clear 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.
   
   Also what is the difference between `delete` and `clear`. When is `delete` 
called?


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