Hi, I think this could be achieved with help from `reconfig`[1]: * Configs all nodes with `standaloneEnabled=false`, `reconfigEnabled=true`. * Starts node-2 as sole quorum participant. * Now node-2 is the leader. You will see "No server failure will be tolerated. You need at least 3 servers”. * Starts node-1 and node-3 with all quorum. * `zkCli.sh config` shows only node-2 for now. * `zkCli.sh reconfig -add node-1,node-2` will add both node-1, node-3 to quorum. * According to `Leader.tryToCommit`[2], node-2 will be the leader due to old leadership in old quorum and voter in new quorum.
node-2 is the leader in whole progress. [1]: https://zookeeper.apache.org/doc/current/zookeeperReconfig.html [2]: https://github.com/apache/zookeeper/blob/b4f9aab099880ba8ef08eaff697debe6cdeae057/zookeeper-server/src/main/java/org/apache/zookeeper/server/quorum/Leader.java#L950 Best, Kezhu Wang On June 19, 2022 at 23:00:59, Heller, George A III CTR (USA) ( george.a.heller2....@mail.mil.invalid) wrote: We have 3 Zookeeper nodes and would like node 2 to always be the leader unless node 2 goes down. IF node 2 goes down, then either node 1 or node 3 would be the leader. Can this be done? If so, how would this be done?
