[GitHub] [airflow] uranusjr commented on issue #26933: Low priority tasks are scheduled before high priority tasks

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uranusjr commented on issue #26933:
URL: https://github.com/apache/airflow/issues/26933#issuecomment-1375212752

   I think this is intended, at least from my reading of the implementation. Currently the scheduler checks how many free slots in the pool, and schedule at most that number of task instances in one iteration. So if a task instance finishes very quickly, its dependencies still need to wait until those task instances that the scheduler has already decided to schedule, even if those possibly lower-priority instances have not started.
   
   The only reasonable fix, from I can tell, is for the scheduler to schedule only one task instance per iteration, but personally I am not sure this is a common enough problem to worth slowing down the entire loop.


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