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https://issues.apache.org/jira/browse/RATIS-1298?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17278665#comment-17278665
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Tsz-wo Sze commented on RATIS-1298:
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[~yjxxtd], that are good points.
For transferring snapshots, Streaming probably will help. Let's focus on log
entires.
For a new server to catch up, we may send the log files instead of sending
entires. Then, Streaming could help. Also, some log entries could be large in
size (such as chunk data in Ozone). Streaming could also help in that case.
When the log entries are small, you are right that Streaming may not help much.
> 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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