[GitHub] [airflow] MatrixManAtYrService commented on issue #18473: CLI: `airflow dags test { dag w/ schedule_interval=None } ` error: "No run dates were found"

[GitBox <gi...@apache.org>]

MatrixManAtYrService commented on issue #18473:
URL: https://github.com/apache/airflow/issues/18473#issuecomment-925904610


   I had filed this issue in the wrong repo previously (oops).  Here's a comment about it from @uranusjr :
   
   
   > Hmm, this is some weird inherited design. So airflow dag test triggers backfill runs (in this instance one backfill run on start_date) but ignores all the scheduling limitations specifies by the DAG. It schedules backfills even for a None schedule (which logically never backfills), and ignore start_date, end_date, etc. The timetable implementation unified the scheduling logic and causes a None schedule to never backfill, and a backfill to never happen outside of the DAG and its tasks’ start_date and end_date.
   > 
   > I think we have a design decision to make. We could stick to the current logic and change airflow dag test to trigger manual runs instead, but that’s affect the behaviour of DAGs that have a schedule since now the backfilled time to run more than once (in the previous implementation, if a date was run by airflow dag test, the scheduler won’t schedule a backfill at that time again). Or we need to add some additional logic to the timetable protocol (and users’ custom timetables) to account for this “hey I know this timetable don’t schedule backfills during this time but please give me a backfilling schedule anyway” logic.


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