Why can't my Zookeeper server rejoin the Quorum?

Question

I have three servers in my quorum. They are running ZooKeeper 3.4.5. Two of them appear to be running fine based on the output from mntr. One of them was restarted

Answer 1

This is a bug of zookeeper: Server is unable to join quorum after connection broken to other peers Restart the leader solves this issue.