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https://issues.apache.org/jira/browse/AIRFLOW-3243?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16727944#comment-16727944
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jack commented on AIRFLOW-3243:
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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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