[jira] [Updated] (AIRFLOW-6389) add config for 'allow_multi_scheduler_instances' default True

["t oo (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/AIRFLOW-6389?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

t oo updated AIRFLOW-6389:
--------------------------
    Priority: Minor  (was: Major)

> add config for 'allow_multi_scheduler_instances' default True
> -------------------------------------------------------------
>
>                 Key: AIRFLOW-6389
>                 URL: https://issues.apache.org/jira/browse/AIRFLOW-6389
>             Project: Apache Airflow
>          Issue Type: New Feature
>          Components: scheduler
>    Affects Versions: 1.10.6
>            Reporter: t oo
>            Priority: Minor
>
> right now common deployment pattern with blue/green build is:
> 1. on EC2 1, start scheduler
> 2. Assign 'final' DNS to EC2 1
> 3. create EC2 2
> 4. start scheduler on EC2 2
> 5.  Assign 'final' DNS to EC2 2
> 6. Teardown EC2 1
> Issue is that since the megastore db (ie mysql) is shared to both EC2s there is a period of time between point 4 and 6 above where there are multiple schedulers running. To avoid this proposing config for 'allow_multi_scheduler_instances' that when set tot False, the startup of scheduler will detect that another scheduler is running then exit (ie not startup) with WARNING message



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