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                ### runid Redis 服務器的隨機標識符(用于 Sentinel 和集群),**重啟后就會改變**;當復制時發現和之前的 run\_id 不同時,將會對數據全量同步。 ![](https://img.kancloud.cn/3b/d3/3bd3fe77eb861d2d3c9b2264626de3ba_1236x870.png) ### 復制偏移量 了解下就行了; 1. 參與復制的主從節點都會維護自身復制偏移量。主節點(master)在處理完寫入命令后,會把命令的字節長度做累加記錄,統計信息在info relication中的master\_repl\_offset指標中; 2. 從節點(slave)每秒鐘上報自身的復制偏移量給主節點,因此主節點也會保存從節點的復制偏移量; 3. 從節點在接收到主節點發送的命令后,也會累加記錄自身的偏移量。統計信息在info relication中的slave\_repl\_offset指標中; ![](https://img.kancloud.cn/30/47/304775c0a849110ba2f78a148924861f_1244x552.png) ### 全量復制 ![](https://img.kancloud.cn/2c/29/2c293fd8738d24b52feece3f515d67df_2778x1678.png) ### 全量復制開銷 1. bgsave的時間; 2. RDB文件網絡傳輸時間; 3. 從節點清空數據時間; 4. 從節點加載RDB的時間; 5. 可能的AOF重寫; ### 部分復制 ![](https://img.kancloud.cn/46/64/4664e870645ba20dcf51df421ff1aebc_2326x1488.png)
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