[GitHub] [airflow] Jorricks commented on issue #18409: Setting max_active_runs = 1 - still have multiple instances of the same dag running

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Jorricks commented on issue #18409:
URL: https://github.com/apache/airflow/issues/18409#issuecomment-924615761


   Hello @denysivanov,
   
   In the example code you submitted, you create a DagRun with status Running. However, this is done directly on the database and thereby you could consider this to be a manual overwrite.
   
   The limits, max_active_runs, are enforced by the scheduler component of Airflow. This component will create DagRuns based on the schedule and put them in the queued state first.   It will only mark them as running if that will not surpass any thresholds like the max_active_runs.
   
   By completely skipping those scheduler steps, there is no way for Airflow to enforce the limit on max_active_runs. Hence, I propose you change the code you showed to set the DagRun  to Queued state instead of Running. That should fix your issue :)


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