jack commented on AIRFLOW-3243:

I don't think the max_active_runs is enforced when clearing tasks.

> UI task and dag clear feature cannot pick up dag parameters
> -----------------------------------------------------------
>                 Key: AIRFLOW-3243
>                 URL: https://issues.apache.org/jira/browse/AIRFLOW-3243
>             Project: Apache Airflow
>          Issue Type: Improvement
>            Reporter: chengningzhang
>            Priority: Major
> Hi, 
>     I meet an issue with airflow UI dags and tasks "clear" feature. When I 
> clear the tasks from the UI, the dag parameters will not be picked up by the 
> the cleared tasks.
>     For example, I have "max_active_runs=1" in my dag parameter, but when I 
> manually clear the tasks, this parameter will not be picked up. The same 
> cleared tasks with different schedule time will run in parallel. 
>    Is there way we can improve this, as we may want to backfill some data and 
> just clear the past tasks from airflow UI. 
> Thanks,
> Chengning

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