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From "Kevin Gao (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (AIRFLOW-401) scheduler gets stuck without a trace
Date Wed, 09 Nov 2016 21:57:58 GMT

    [ https://issues.apache.org/jira/browse/AIRFLOW-401?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15652167#comment-15652167
] 

Kevin Gao commented on AIRFLOW-401:
-----------------------------------

Setting up a CeleryExecutor resolved the issue for us. Perhaps adding a note in the documentation
could be useful to help avoid unexpected growing pains.

> 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
>         Attachments: Dag_code.txt, schduler_cpu100%.png, scheduler_stuck.png, scheduler_stuck_7hours.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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