查看mysql插件

mysql> show plugins;

查看是否允许加在模块
mysql> show variables like "have_dynamic_loading";

安装半同步插件

mysql> install plugin rpl_semi_sync_slave soname 'semisync_slave.so';
mysql> install plugin rpl_semi_sync_master soname 'semisync_master.so';

查看本同步模块
mysql> select plugin_name,plugin_status from information_schema.plugins where plugin_name like "%semi%";
+----------------------+---------------+
| plugin_name          | plugin_status |
+----------------------+---------------+
| rpl_semi_sync_master | ACTIVE        |
| rpl_semi_sync_slave  | ACTIVE        |
+----------------------+---------------+
2 rows in set (0.00 sec)

打开半同步复制
mysql> set global rpl_semi_sync_master_enabled = 1;
Query OK, 0 rows affected (0.00 sec)

mysql> set global rpl_semi_sync_slave_enabled = 1;
Query OK, 0 rows affected (0.00 sec)

查看半同步复制状态
mysql> show variables  like "rpl_semi_sync_%_enabled";
+------------------------------+-------+
| Variable_name                | Value |
+------------------------------+-------+
| rpl_semi_sync_master_enabled | ON    |
| rpl_semi_sync_slave_enabled  | ON    |
+------------------------------+-------+