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Posted to issues@ratis.apache.org by GitBox <gi...@apache.org> on 2022/03/02 13:59:03 UTC

[GitHub] [ratis] szetszwo commented on pull request #614: RATIS-1540. Remove old PeerConfiguration API and change SetConfiguration

szetszwo commented on pull request #614:
URL: https://github.com/apache/ratis/pull/614#issuecomment-1056960826


   > ... so what is the difference between learner and listener?
   
   A Learner will automatically convert to a voting member when it catches up, but a Listener will never convert automatically.
   
   Then, why we do need Learners?  It is for starting many new servers at the same time.  For example, a group originally has 3 nodes and we want to change it to 11 nodes.  If we add all the new nodes as voting members, the leader suddenly cannot commit anymore transactions since it no longer can commit to the majority.  It has to wait for some of the new nodes catching up.
   


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