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https://issues.apache.org/jira/browse/RATIS-1298?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17277154#comment-17277154
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Tsz-wo Sze commented on RATIS-1298:
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[~amaliujia], thanks a lot for the doc. I have a better picture now.
The "learner" described in the doc (it won't automatically become a follower
unless an admin changes it) is different from the "learner" in Section 4.2.1 in
[1] (it will automatically become a follower once it has caught up the log).
Therefore, I suggest calling it a "listener" (since it won't automatically
become a follower) instead of a "learner". Then, an admin can change a listener
to a learner for promoting it to a follower. Then, the "learner" here will be
the same as the "learner" in Section 4.2.1 in [1].
For the implementation, we may have the following works:
# support listener;
# support learner;
# support promoting a listener to a learner.
What do you think?
> 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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