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主从切换流程 #15

@xialuo1990

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@xialuo1990

意外切换时:增加binlog同步差异判断,如果从库差异binlog event大于阈值,将从库设置成only-flow,并打印日志;如果从库的binlog差异小于规定阈值,优先切换;走后续补偿

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