Bolke de Bruin commented on AIRFLOW-401:

[~sudow...@gmail.com] It is expected behaviour as the LocalExecutor runs _in 
process_. Use 1.8.1+ and do not use "-n 5" and you will not encounter the issue.

> scheduler gets stuck without a trace
> ------------------------------------
>                 Key: AIRFLOW-401
>                 URL: https://issues.apache.org/jira/browse/AIRFLOW-401
>             Project: Apache Airflow
>          Issue Type: Bug
>          Components: executor, scheduler
>    Affects Versions: Airflow
>            Reporter: Nadeem Ahmed Nazeer
>            Assignee: Bolke de Bruin
>            Priority: Minor
>         Attachments: Dag_code.txt, schduler_cpu100%.png, 
> scheduler_stuck_7hours.png, scheduler_stuck.png
> The scheduler gets stuck without a trace or error. When this happens, the CPU 
> usage of scheduler service is at 100%. No jobs get submitted and everything 
> comes to a halt. Looks it goes into some kind of infinite loop. 
> The only way I could make it run again is by manually restarting the 
> scheduler service. But again, after running some tasks it gets stuck. I've 
> tried with both Celery and Local executors but same issue occurs. I am using 
> the -n 3 parameter while starting scheduler. 
> Scheduler configs,
> job_heartbeat_sec = 5
> scheduler_heartbeat_sec = 5
> executor = LocalExecutor
> parallelism = 32
> Please help. I would be happy to provide any other information needed

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