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https://issues.apache.org/jira/browse/RATIS-1298?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17279393#comment-17279393
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Tsz-wo Sze commented on RATIS-1298:
-----------------------------------
Some unorganized ideas below
- A listener could listen from another listener.
- Similarly, a follower could get log entires from another follower (in order
to support a large number of followers).
- We should also consider network distance.
- For learners, we might have multiple rounds as described in Section 4.2.1 in
[1]. The learner could get log entries from followers/listeners in the first
few rounds. Then, it should get log entries from leader so that the leader
could automatically change it to a follower.
- I think we may consider the load balancing and the topology later since they
are useful only when there is a large number of listeners.
- The number of listeners could be large but the number of learners should
small, say 1 or 2, since learners are short-lived (they will become followers.)
> 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
>
> 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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