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https://issues.apache.org/jira/browse/RATIS-1298?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17281016#comment-17281016
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Tsz-wo Sze commented on RATIS-1298:
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> .... runzhiwang's proposal sounds like a listener that allows data loss
> (because sync from a follower).
That's is good point. When listening form a follower, it can sync up to the
commit index of the follower.
> Can we make a separate JIRA for runzhiwang's proposal? ...
Yes, it is good to have a separated JIRA. In this JIRA, the listener/learner
may just sync with the leader. The new JIRA will change it to sync from a
non-leader.
> Support non-voting members (Listeners/Learners)
> -----------------------------------------------
>
> Key: RATIS-1298
> URL: https://issues.apache.org/jira/browse/RATIS-1298
> Project: Ratis
> Issue Type: New Feature
> Components: server
> Reporter: Rui Wang
> Assignee: Rui Wang
> Priority: Major
> Attachments: screenshot-1.png
>
>
> 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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