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https://issues.apache.org/jira/browse/AIRFLOW-2340?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16449053#comment-16449053
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Xiao Zhu commented on AIRFLOW-2340:
-----------------------------------
We see that with our mysql db too
> SQLalchemy pessimistic connection handling not working
> ------------------------------------------------------
>
> Key: AIRFLOW-2340
> URL: https://issues.apache.org/jira/browse/AIRFLOW-2340
> Project: Apache Airflow
> Issue Type: Bug
> Components: scheduler
> Affects Versions: 1.9.0
> Reporter: John Arnold
> Priority: Critical
> Attachments: airflow_traceback.txt, webserver.txt
>
>
> Our scheduler keeps crashing, about once a day. It seems to be triggered by
> a failure to connect to the postgresql database, but then it doesn't recover
> and crashes the scheduler over and over.
> The scheduler runs in a container in our environment, so after several
> container restarts, docker gives up and the container stays down.
> Airflow should be able to recover from a connection failure without blowing
> up the container altogether. Perhaps some exponential backoff is needed?
>
> See attached log from the scheduler.
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