Ivan Andika created RATIS-2272:
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Summary: Support Raft learner
Key: RATIS-2272
URL: https://issues.apache.org/jira/browse/RATIS-2272
Project: Ratis
Issue Type: New Feature
Components: server
Reporter: Ivan Andika
Assignee: Ivan Andika
RATIS-1298 added support for Ratis listener (non-voting member). Ratis listener
cannot be promoted to the leader even when it already catch up with the leader.
So currently to add a voting-member, Ratis only supports adding a Raft
follower. However, the issue is that Raft follower is immediately a voting
member, which will include the quorum requirement of the Raft group, although
it might take a while for the new Raft follower to catch up to the leader. This
might cause availability issues in cases like network partition, split brain,
etc.
As discussed in RATIS-1298, we can support Raft learner as a next step. This
will help to resolve availability issues.
This is a long-term effort
Resources
* Raft dissertation (Section 4.2.1)
* [https://etcd.io/docs/v3.5/learning/design-learner/]
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