不重启修改'log_slave_updates'变量

Variable 'log_slave_updates' is a read only variable 不重启修改mysql变量

• 执行复制的时候遇到的问题

mysql> show variables like 'log_slave_updates';
+-------------------+-------+
| Variable_name     | Value |
+-------------------+-------+
| log_slave_updates | OFF   |
+-------------------+-------+
1 row in set (0.00 sec)  

mysql> set global log_slave_updates=1;
ERROR 1238 (HY000): Variable 'log_slave_updates' is a read only variable  

mysql> system gdb -p $(pidof mysqld) -ex "set opt_log_slave_updates=1" -batch
mysql> show variables like 'log_slave_updates';
+-------------------+-------+
| Variable_name | Value |
+-------------------+-------+
| log_slave_updates | ON |
+-------------------+-------+