然而對於多個節點，我們如何來實現一致性，這就是分布式一致性的問題。

Raft就是一個實現分布式一致性的協議

下面讓我們來看看它是如何工作的？

node介紹：

每一個節點有三種state

（1） follower state

（2） leader state

（3） candidate state

Leader Election

所有的節點都是從follower state開始的，如果一個follower狀態的節點沒有被某個leader所控制，它就有可能成為候選者。而當一個節點成為候選者時，它就會向其他節點收集選票，而其他節點在收到候選者發出的信號後，就會把選票發給候選者。如果某個候選者獲取了大多數選票，則會成為領導者。這個過程就是領導者選舉。

整個選舉過程是有一個時間限制的，

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