Bolke de Bruin commented on AIRFLOW-401:

[~rotten] That is expected behaviour. The LocalExecutor runs in process thus 
the scheduler cannot restart until all tasks have finished. Run without 
restarts (which is the recommended behaviour) and the scheduler will just 
happily continue.

[~grecco-gn] What version of rabbitmq (incl python libs) and celery did you use?

> 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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