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

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

christianbrugger commented on issue #26933:
URL: https://github.com/apache/airflow/issues/26933#issuecomment-1375355525

   I am not talking about a resource conflict. That indeed would be tricky to implement.
   
   The problem I encountered is much more basic. It happens within a high priority DAG with multiple tasks. After the first task is finished instead of scheduling the next one in this DAG, which has high priority and is ready to start, a low priority task from a different DAG is scheduled. I presume just because of the fact that it is already waiting and the dependent tasks has not been marked for scheduling.
   
   We need to somehow make sure hat the dependent tasks of a finishing tasks are put into the waiting queue, before scheduling any new tasks for the now free slot. So that 4 always happens before 3 or even 2.
   
   ![image](https://user-images.githubusercontent.com/235346/211280728-8be0bdaa-87bf-4c26-b9ca-d866a2a6b2a5.png)
   


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