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From "Bolke de Bruin (JIRA)" <j...@apache.org>
Subject [jira] [Comment Edited] (AIRFLOW-401) scheduler gets stuck without a trace
Date Mon, 17 Jul 2017 13:17:00 GMT

    [ https://issues.apache.org/jira/browse/AIRFLOW-401?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16089806#comment-16089806
] 

Bolke de Bruin edited comment on AIRFLOW-401 at 7/17/17 1:16 PM:
-----------------------------------------------------------------

The scheduler does not restart itself just like that. That is a configuration thing. It does
iterate over tasks in a loop. Please explain what you mean by "restarting". Does it get a
new PID? Then you are running with a configuration that tells the scheduler to terminate and
you have a external way to restart it.


was (Author: bolke):
The scheduler does not restart itself just like that. That is a configuration thing. It does
iterate of tasks in a loop. Please explain what you mean by "restarting". Does it get a new
PID? Then you are running with a configuration that tells the scheduler to terminate and you
have a external way to restart it.

> 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 1.7.1.3
>            Reporter: Nadeem Ahmed Nazeer
>            Assignee: Bolke de Bruin
>            Priority: Minor
>              Labels: celery, kombu
>         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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