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https://issues.apache.org/jira/browse/HDDS-4775?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Ethan Rose reassigned HDDS-4775:
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Assignee: (was: Ethan Rose)
> Avoid OM split brain going from 1 node OM to 3 node ratis without bootstrap
> ---------------------------------------------------------------------------
>
> Key: HDDS-4775
> URL: https://issues.apache.org/jira/browse/HDDS-4775
> Project: Apache Ozone
> Issue Type: Sub-task
> Reporter: Ethan Rose
> Priority: Major
>
> The expected flow to add more OMs to a single node OM ratis cluster is to
> adjust the configurations to add the new OMs, and then start the new OMs in
> bootstrap mode (supply the -–bootstrap flag on startup) so that they will get
> all transaction history from the original OM. However, it is possible for the
> user to mistakenly adjust the configs and not start the new OMs with the
> --bootstrap command. This will cause the two new OMs to form their own Ratis
> ring with a 2/3 majority that can service write requests, while the original
> OM is still the leader of a single node Ratis ring and also servicing write
> requests. This leads to a split brain scenario that is difficult to detect
> without inspecting the logs, because all OMs appear functional and the
> cluster is writeable.
> This Jira aims to detect such a scenario and shut down the OMs when it
> occurs, instructing the user to bootstrap the new OMs on startup instead.
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