codings-dan commented on pull request #614: URL: https://github.com/apache/ratis/pull/614#issuecomment-1057579760
> > ... 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. Thanks for the explanation, I understand now. -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: [email protected] For queries about this service, please contact Infrastructure at: [email protected]
