centos 6.5
mysql5.7
在從庫作stop slave時報：
error:
ERROR 1794 (HY000): Slave is not configured or failed to initialize properly. You must at least set --server-id to enable either a master or a slave. Additional error messages can be found in the MySQL error log.
經分析，需要：
刪除5張表，並重新導入腳本
use mysql
drop table slave_master_info;
drop table slave_relay_log_info;
drop table slave_worker_info;
drop table innodb_index_stats;
drop table innodb_table_stats;
source /usr/coolpad/mysql/share/mysql_system_tables.sql
(2)重新啟動數據庫
注：這一步是必須的，否則無法正常配置雙主架構。