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https://issues.apache.org/jira/browse/RATIS-1298?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17277843#comment-17277843
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runzhiwang edited comment on RATIS-1298 at 2/4/21, 1:08 AM:
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[~szetszwo] I have two thoughts, not sure which one is better:
1. Learner pull log from follower in a round robin way
cons: We need to write code about learner pull log
pros: Learner does not need to consider follower crash.
2.Follower push log to learner. When learner start, it register to one
follower, then follower use GrpcLogAppender to append log to learner, if
follower crash, learner need to register to other follower.
cons: We need to consider the logic of register , especially when follower
crash.
pros: We can use GrpcLogAppender to append log.
was (Author: yjxxtd):
[~szetszwo] I have two options, not sure which one is better:
1. Learner pull log from follower in a round robin way
cons: We need to write code about learner pull log
pros: Learner does not need to consider follower crash.
2.Follower push log to learner. When learner start, it register to one
follower, then follower use GrpcLogAppender to append log to learner, if
follower crash, learner need to register to other follower.
cons: We need to consider the logic of register , especially when follower
crash.
pros: We can use GrpcLogAppender to append log.
> 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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