下面實驗是基于http://5073392.blog.51cto.com/5063392/1536487搭建的

1） 在master上安裝插件
mysql> install plugin rpl_semi_sync_master SONAME 'semisync_master.so';
Query OK, 0 rows affected (0.18 sec)

2）在salve上安裝插件
mysql> INSTALL PLUGIN rpl_semi_sync_slave SONAME 'semisync_slave.so';

3）激活半同步復制
master：
mysql> SET GLOBAL rpl_semi_sync_master_enabled = on;

slave：
mysql> SET GLOBAL rpl_semi_sync_slave_enabled = on;

mysql> STOP SLAVE IO_THREAD; START SLAVE IO_THREAD;

4） 確認半同步正在工作
master：
mysql> SHOW STATUS LIKE 'Rpl_semi_sync_master_status';
+-----------------------------+-------+
| Variable_name?????????????? | Value |
+-----------------------------+-------+
| Rpl_semi_sync_master_status | ON??? |
+-----------------------------+-------+
1 row in set (0.00 sec)

salve：
mysql> SHOW STATUS LIKE 'Rpl_semi_sync_slave_status';
+----------------------------+-------+
| Variable_name????????????? | Value |
+----------------------------+-------+
| Rpl_semi_sync_slave_status | ON??? |
+----------------------------+-------+
1 row in set (0.04 sec)

5） 在master上確認半同步模式下至少連了一臺從機
mysql> SHOW STATUS LIKE 'Rpl_semi_sync_master_clients';
+------------------------------+-------+
| Variable_name??????????????? | Value |
+------------------------------+-------+
| Rpl_semi_sync_master_clients | 1???? |
+------------------------------+-------+
1 row in set (0.00 sec)

6）在master上確認復制是否在半同步模式下運行
mysql> SHOW STATUS LIKE 'Rpl_semi_sync_master_yes_tx';
+-----------------------------+-------+
| Variable_name?????????????? | Value |
+-----------------------------+-------+
| Rpl_semi_sync_master_yes_tx | 0???? |
+-----------------------------+-------+
1 row in set (0.00 sec)

mysql> use test;
Reading table information for completion of table and column names
You can turn off this feature to get a quicker startup with -A

Database changed
mysql> insert into test values (3);
Query OK, 1 row affected (0.01 sec)

mysql> SHOW STATUS LIKE 'Rpl_semi_sync_master_yes_tx';
+-----------------------------+-------+
| Variable_name?????????????? | Value |
+-----------------------------+-------+
| Rpl_semi_sync_master_yes_tx | 1???? |
+-----------------------------+-------+
1 row in set (0.00 sec)

mysql> insert into test values (4);
Query OK, 1 row affected (0.01 sec)

mysql> SHOW STATUS LIKE 'Rpl_semi_sync_master_yes_tx';
+-----------------------------+-------+
| Variable_name?????????????? | Value |
+-----------------------------+-------+
| Rpl_semi_sync_master_yes_tx | 2???? |
+-----------------------------+-------+
1 row in set (0.00 sec)

?

轉載于:https://blog.51cto.com/5073392/1536521

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