Raft 节点启动后,会在 Follower 、 Candidate 、 Leader 3 个状态间转换,直到关闭 Shutdown
// RaftState captures the state of a Raft node: Follower, Candidate, Leader, // or Shutdown. type RaftState uint32 const ( // Follower is the initial state of a Raft node. Follower RaftState = iota // Candidate is one of the valid states of a Raft node. Candidate // Leader is one of the valid states of a Raft node. Leader // Shutdown is the terminal state of a Raft node. Shutdown