ephraimbuddy opened a new pull request #17786:
URL: https://github.com/apache/airflow/pull/17786


   Currently, tasks can be run even if the `dagrun` is queued. Task instances 
of queued `dagruns`
   should only be run when the `dagrun` is in a running state. This PR makes 
sure `tis` of queued `dagruns`
   are not run thereby properly checking task concurrency.
   
   Also, we check max_active_runs when parsing dag which is no longer needed 
since `dagruns`
   are created in `queued` state and the scheduler controls when to change the 
queued `dagruns`
   to running considering the max_active_runs.
   This PR removes the checking of max_active_runs in the dag too.
   
   
   
   ---
   **^ Add meaningful description above**
   
   Read the **[Pull Request 
Guidelines](https://github.com/apache/airflow/blob/main/CONTRIBUTING.rst#pull-request-guidelines)**
 for more information.
   In case of fundamental code change, Airflow Improvement Proposal 
([AIP](https://cwiki.apache.org/confluence/display/AIRFLOW/Airflow+Improvements+Proposals))
 is needed.
   In case of a new dependency, check compliance with the [ASF 3rd Party 
License Policy](https://www.apache.org/legal/resolved.html#category-x).
   In case of backwards incompatible changes please leave a note in 
[UPDATING.md](https://github.com/apache/airflow/blob/main/UPDATING.md).
   


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