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https://issues.apache.org/jira/browse/AIRFLOW-3356?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16727825#comment-16727825
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jack commented on AIRFLOW-3356:
-------------------------------
I'm having the same issue also on 1.9
Some tasks are stuck on running even though they are not (tasks that takes 1-4
minutes to execute get stuck for hours)... Only clearing them solve this and
then they are re-scheduled.
> Scheduler gets stuck for certain DAGs
> -------------------------------------
>
> Key: AIRFLOW-3356
> URL: https://issues.apache.org/jira/browse/AIRFLOW-3356
> Project: Apache Airflow
> Issue Type: Bug
> Components: scheduler
> Affects Versions: 1.9.0
> Reporter: John Smodic
> Priority: Critical
>
> I observe the scheduler getting stuck for certain DAGs:
> Nov 15 19:11:48 ip-172-16-13-120 python3.6[1319]: File Path PID Runtime Last
> Runtime Last Run
> Nov 15 19:11:48 ip-172-16-13-120 python3.6[1319]:
> /home/ubuntu/airflow/dags/stuck_dag.py 14241 *19977.55s* 1.05s
> 2018-11-15T13:38:47
> Nov 15 19:11:48 ip-172-16-13-120 python3.6[1319]:
> /home/ubuntu/airflow/dags/not_stuck_dag.py 19906 0.05s 1.05s
> 2018-11-15T19:11:44
>
> The "Runtime" of the stuck DAG's scheduling process is huge and I can't tell
> what it's doing. There's no mention of that DAG in the scheduler logs
> otherwise.
>
> The mapped process looks like this:
> ubuntu 14241 0.0 0.3 371132 63232 ? S 13:38 0:00 /usr/bin/python3.6
> /usr/local/bin/airflow scheduler
>
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