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https://issues.apache.org/jira/browse/RATIS-1298?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17277738#comment-17277738
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runzhiwang commented on RATIS-1298:
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[~szetszwo] [~glengeng] [~amaliujia] I think learner maybe better belongs to
follower, not leader. If leader append log to learner, it will increase
leader's burden, if we have a lot of learner, it maybe worse. So we can use
follower append log to learner.
> 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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