Major Description
In HA case, such as there are three server: server1, server2, server3, server1 is the leader, if we want to rolling upgrade leader, we can upgrade server2, and then assign server2 with the highest priority, and server1 stop accepting client request, then server2 will try to grab the leader once catch up the log, if we want to rollback, we can assign server1 with the highest priority and server2 stop accepting client request.
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