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