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Posted to commits@airflow.apache.org by GitBox <gi...@apache.org> on 2021/05/18 08:23:31 UTC

[GitHub] [airflow] ashb edited a comment on issue #15897: Set a state of task instances can not be applied to a specific task instance

ashb edited a comment on issue #15897:
URL: https://github.com/apache/airflow/issues/15897#issuecomment-842963938


   > @ashb, then can you ensure that's a kind of PK and there can not be more than one task instance with the same dag_id, task_id and execution_date even when they start at the same time? Thanks
   
   Correct. That is a unique constraint in the database.
   
   `execution_date` is a confusing term (that we're going to get rid of/deprecate in Airflow 2.2) -- it is not "when am I running" (i.e. `now()`, it is instead "what is the start of the period of data I should look at"
   
   See https://cwiki.apache.org/confluence/display/AIRFLOW/AIP-39+Richer+scheduler_interval for a bit more detail on our proposals. 


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