一 配置完成主从

二 安装和配置插件

1 master:

命令帮助:

mysql> help install

Name: 'INSTALL PLUGIN'

Description:

Syntax:

INSTALL PLUGIN plugin_name SONAME 'shared_library_name'

1) 插件安装：

mysql> install plugin rpl_semi_sync_master SONAME 'semisync_master.so';

Query OK, 0 rows affected (0.88 sec)

mysql> show variables like '%semi%';

+------------------------------------+-------+

| Variable_name                      | Value |

+------------------------------------+-------+

| rpl_semi_sync_master_enabled       | OFF   |

| rpl_semi_sync_master_timeout       | 10000 |     单位：毫秒，默认为10秒

| rpl_semi_sync_master_trace_level   | 32    |

| rpl_semi_sync_master_wait_no_slave | ON    |

+------------------------------------+-------+

4 rows in set (0.01 sec)

2) 启动插件和设置参数

mysql> set global rpl_semi_sync_master_enabled=1;

Query OK, 0 rows affected (0.00 sec)

mysql> set global rpl_semi_sync_master_timeout=2000;

Query OK, 0 rows affected (0.00 sec)

mysql> show variables like '%semi%';

+------------------------------------+-------+

| Variable_name                      | Value |

+------------------------------------+-------+

| rpl_semi_sync_master_enabled       | ON    |

| rpl_semi_sync_master_timeout       | 2000  |

| rpl_semi_sync_master_trace_level   | 32    |

| rpl_semi_sync_master_wait_no_slave | ON    |

+------------------------------------+-------+

4 rows in set (0.00 sec)

2 slave:

1) 安装插件

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

Query OK, 0 rows affected (0.30 sec)

mysql> show variables like '%semi%';

+---------------------------------+-------+

| Variable_name                   | Value |

+---------------------------------+-------+

| rpl_semi_sync_slave_enabled     | OFF   |

| rpl_semi_sync_slave_trace_level | 32    |

+---------------------------------+-------+

2 rows in set (0.00 sec)

2) 启动插件

mysql> set global rpl_semi_sync_slave_enabled=1;

Query OK, 0 rows affected (0.00 sec)

mysql> stop slave IO_thread;

Query OK, 0 rows affected (0.82 sec)

mysql> start slave IO_thread;

Query OK, 0 rows affected (0.00 sec)

三 检查配置和验证

mysql> show global status like '%semi%';

+--------------------------------------------+-------+

| Variable_name                              | Value |

+--------------------------------------------+-------+

| Rpl_semi_sync_master_clients               | 1     |         显示半同步的slave的数量

| Rpl_semi_sync_master_net_avg_wait_time     | 0     |

| Rpl_semi_sync_master_net_wait_time         | 0     |

| Rpl_semi_sync_master_net_waits             | 0     |

| Rpl_semi_sync_master_no_times              | 0     |

| Rpl_semi_sync_master_no_tx                 | 0     |

| Rpl_semi_sync_master_status                | ON    |

| Rpl_semi_sync_master_timefunc_failures     | 0     |

| Rpl_semi_sync_master_tx_avg_wait_time      | 0     |

| Rpl_semi_sync_master_tx_wait_time          | 0     |

| Rpl_semi_sync_master_tx_waits              | 0     |

| Rpl_semi_sync_master_wait_pos_backtraverse | 0     |

| Rpl_semi_sync_master_wait_sessions         | 0     |

| Rpl_semi_sync_master_yes_tx                | 0     |

+--------------------------------------------+-------+

14 rows in set (0.01 sec)

四 卸载插件

mysql> help uninstall

Name: 'UNINSTALL PLUGIN'

Description:

Syntax:

UNINSTALL PLUGIN plugin_name

注意：

一旦某次等待超时，会自动降级为异步；