MMM高可用故障切换示意图Multi-Master Managerdb6db1db7R2R1W1db6db1db7R2R1W1Db7挂db6db1db7R2R1W1Db7恢复后db6db1db7R2R1W1Db6挂db6db1db7R2R1W1Db6恢复后4 host3 host =4 master 4 host =4 slave3 lvdb6db1db7R2R1W1db5R3Writer:db6,db7Reader:db6,db7,db1,db5db6db1db7R2R1W1db5R3Db5挂db6db1db7R2R1W1db5R3Db5恢复后db6db1db7R2R1W1db5R3Db7挂db6db1db7R2R1W1db5R3Db7恢复后db6db1db7R2R1W1db5R3db1挂db6db1db7R2R1W1db5R3Db1恢复后db6db1db7R2R1W1db5R3Db6挂db1db7R2R1W1db5R3db6Db6恢复后4 node2M2S3L当设置.prefer db6db1db7R2R1W1db5R3db6正常状态db6db1db7R2R1W1db5R3启动MMM后，会自动调整成这样的状态db6db1db7R2R1W1db5R3假如这是当前状态db6db1db7R2R1W1db5R3在某些情况下，db5的master可能会由db1变为db62M2S2Ldb6db1db7R2R1W1db5R3db6db1db7R2R1W1db5R3Db5挂db6db1db7R2R1W1db5R3Db5恢复后db6db1db7R2R1W1db5R3Db7挂db6db1db7R2R1W1db5R3Db7恢复后db6db1db7R2R1W1db5R3Db6挂db6db1db7R2R1W1db5R3Db6恢复之后Db1在db6挂了之后，把master切到db7，当db6恢复之后，所有的slave都在db7下面保持不变，除非设置db6为prefer writer上面这些所有的故障切换，有了MMM之后就可以自动实现了。That All！by: Jcr Cui