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https://issues.apache.org/jira/browse/RATIS-1298?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17277366#comment-17277366
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Rui Wang commented on RATIS-1298:
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Thanks [~szetszwo]
I agree with your suggested steps. The use case cane from that Admin can
prepare a warmed node and then replace an existing problematic node by the
warmed node. So at least from cluster maintainers I think they want to control
the process of a listener to learner.
I will update JIRA to reflect our discussion.
> Support Learner/Non-voting member in Ratis
> ------------------------------------------
>
> Key: RATIS-1298
> URL: https://issues.apache.org/jira/browse/RATIS-1298
> Project: Ratis
> Issue Type: New Feature
> Reporter: Rui Wang
> Assignee: Rui Wang
> Priority: Major
>
> It's time to add the non-voting member, or leaner that is proposed in Raft
> thesis 4.2.1 (you can find a copy at [1]).
> The leaner is useful to maintain high availability when new servers join Raft
> ring (details at thesis 4.2.1). For Ozone SCM HA effort, we have also
> discussed the possibility to utilize leaner as the tool to replace SCM nodes
> online.
> [1]: https://github.com/ongardie/dissertation
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