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https://issues.apache.org/jira/browse/RATIS-1298?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17278667#comment-17278667
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Tsz-wo Sze commented on RATIS-1298:
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> 1. leader still need to write log entry from on-heap to off-heap, when append
> log.
A leader sends the same log entry to multiple followers. gRPC may have a buffer
copying for each follower. (Need to verify it).
> 2. when follower receive log entry, it still need to read it from off-heap to
> on-heap, to decode the request and apply log.
It depends on the applications. For Ozone chunk data, it could directly write
the data to a file.
> 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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