官方說明：
--log-slave-updates

Command-Line Format	--log-slave-updates
Option-File Format	log-slave-updates
System Variable Name	log_slave_updates
Variable Scope	Global
Dynamic Variable	No
?	Permitted Values
	Type	boolean
	Default	FALSE

Normally, a slave does not log to its own binary log any updates that are received from a master server. This option tells the slave to log the updates performed by its SQL thread to its own binary log. For this option to have any effect, the slave must also be started with the?--log-bin?option to enable binary logging.?--log-slave-updates?is used when you want to chain replication servers. For example, you might want to set up replication servers using this arrangement: A -> B -> C Here,?A?serves as the master for the slave?B, and?B?serves as the master for the slave?C. For this to work,?B?must be both a master?and?a slave. You must start both?A?and?B?with?--log-bin?to enable binary logging, and?B?with the?--log-slave-updates?option so that updates received from?A?are logged by?B?to its binary log.

這個參數用來配置從服務器上的更新似乎否寫二進制日志，默認是不打開的。但是，如果這個從服務器也要作為其他服務器的主服務器，搭建一個鏈式的復制，那么就需要打開這個選項，這樣它的從服務器將獲得該從庫的二進制日志以進行同步操作。
這個啟動參數需要和--logs-bin參數一起使用。如果只打開log-slave-updates而關閉--logs-bin，在數據庫啟動時會報錯。

轉載于:https://www.cnblogs.com/zhaoshuangshuang/p/3363733.html

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