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https://issues.apache.org/jira/browse/RATIS-1298?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17277645#comment-17277645
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runzhiwang commented on RATIS-1298:
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[~amaliujia] I have one question.
For example, if we have 4 scm: scm1 is leader, scm2 and scm3 are follower, scm4
is listener. scm1, scm2 and scm3 all are in rack1, scm4 is in rack2. When rack1
crash, how we can use scm4 to recover scm ?
> 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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