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https://issues.apache.org/jira/browse/AIRFLOW-2701?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16601356#comment-16601356
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Apache Spark commented on AIRFLOW-2701:
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User 'feng-tao' has created a pull request for this issue:
https://github.com/apache/incubator-airflow/pull/3562
> Clean up dangling backfill dagrun
> ---------------------------------
>
> Key: AIRFLOW-2701
> URL: https://issues.apache.org/jira/browse/AIRFLOW-2701
> Project: Apache Airflow
> Issue Type: Bug
> Reporter: Tao Feng
> Assignee: Tao Feng
> Priority: Major
>
> When user tries to backfill and hit ctrol+9, the backfill dagrun will stay as
> running state. We should set it to failed if it has unfinished tasks.
>
> In our production, we see lots of these dangling backfill dagrun which will
> cause as one active dagrun in the next backfill. This may prevent user from
> backfilling if the max_active_run is reached.
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