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                ### Leader工作流程 Leader主要有三個功能: 1. 恢復數據; 2. 維持與Learner的心跳,接收Learner請求并判斷Learner的請求消息類型; 3. Learner的消息類型主要有PING消息、REQUEST消息、ACK消息、REVALIDATE消息,根據不同的消息類型,進行不同的處理。 #### Learner消息類型 * PING消息是指Learner的心跳信息; * REQUEST消息是Follower發送的提議信息,包括寫請求及同步請求; * ACK消息是Follower的對提議的回復,超過半數的Follower通過,則commit該提議; * REVALIDATE消息是用來延長SESSION有效時間; Leader的工作流程簡圖如下所示,在實際實現中,流程要比下圖復雜得多,啟動了三個線程來實現功能: ![](https://img.kancloud.cn/89/b2/89b23ffe7d67f243d365ed94dc8cb910_425x594.png)
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