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https://issues.apache.org/jira/browse/AIRFLOW-78?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15410528#comment-15410528
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Adrian Bridgett commented on AIRFLOW-78:
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Yes max_active_runs is set to 1 (on the DAG) and B depends on A
(B.set_upstream(A))
> airflow clear leaves dag_runs
> -----------------------------
>
> Key: AIRFLOW-78
> URL: https://issues.apache.org/jira/browse/AIRFLOW-78
> Project: Apache Airflow
> Issue Type: Wish
> Components: cli
> Affects Versions: Airflow 1.6.2
> Reporter: Adrian Bridgett
> Assignee: Norman Mu
> Priority: Minor
>
> (moved from https://github.com/apache/incubator-airflow/issues/829)
> "airflow clear -c -d -s 2016-01-03 dagid" doesn't clear the dagrun, it sets
> it to running instead (apparently since this is often used to re-run jobs).
> However this then breaks max_active_runs=1 (I have to stop the scheduler,
> then airflow clear, psql to delete the dagrun, then start the scheduler).
> This problem was probably seen on an Airflow 1.6.x install.
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