一、Mysql半同步複製

條件：GTID配置完成

1、Master端配置

<1>安裝外掛、開啟半同步

mysql> install plugin rpl_semi_sync_master soname 'semisync_master.so';  ##安裝外掛
mysql> set global rpl_semi_sync_master_enabled=1;       ##開啟半同步

示圖：檢視master半同步是否可用

示圖：master半同步狀態開啟

2、Slave端配置

<1>安裝外掛、開啟半同步

mysql> install plugin rpl_semi_sync_slave soname 'semisync_slave.so';
mysql> set global rpl_semi_sync_slave_enabled=1;
 

示圖：檢視slave半同步是否可用

示圖：slave端半同步狀態關閉

<2>停止並重新開始IO執行緒

mysql> stop slave io_thread;
mysql> start slave io_thread;

示圖：再次檢視slave半同步狀態—開啟

<3>Master端檢視半同步客戶端數量為1

測試：

將slave的io執行緒停掉，master寫入資料，會預設等待10s，如果超時還未等到slave的ack，將自動切換到非同步複製，當slave的io執行緒再次開啟，複製將自動切換到半同步方式。

<1>從庫關閉io執行緒

mysql> stop slave io_thread;
 

<2>主庫寫入資料時，出現 10000ms 的延遲，模式：半同步 --> 非同步

mysql> insert into westos.usertb values('user4','111');

示圖：

<3>從庫開啟io執行緒

mysql> start slave io_thread;

<4>主庫再次寫入資料

mysql> insert into westos.usertb values('user5','222');

示圖：

<5>slave端檢視資料—同步

二、並行複製

1、檢視Slave的sql執行緒型別

mysql> show processlist; 
+----+-------------+-----------+-------+---------+------+--------------------------------------------------------+------------------+
| Id | User        | Host      | db    | Command | Time | State                                                  | Info             |
+----+-------------+-----------+-------+---------+------+--------------------------------------------------------+------------------+
|  6 | root        | localhost | mysql | Query   |    0 | starting                                               | show processlist |
|  8 | system user |           | NULL  | Connect | 3454 | Slave has read all relay log; waiting for more updates | NULL             |
| 10 | system user |           | NULL  | Connect | 3477 | Waiting for master to send event                       | NULL             |
+----+-------------+-----------+-------+---------+------+--------------------------------------------------------+------------------+
 

2、Slave端配置

[[email protected] ~]# vim /etc/my.cnf
slave-parallel-type=LOGICAL_CLOCK
slave-parallel-workers=16	    ##執行緒數
master_info_repository=TABLE	##master_info儲存方式為：table
relay_log_info_repository=TABLE	##relay_log_info儲存方式為：table
relay_log_recovery=ON
[[email protected] ~]# /etc/init.d/mysqld restart

3、Slave原有的sql執行緒轉化為排程器

slave複製方式已更新

mysql> show processlist;
+----+-------------+-----------+------+---------+------+--------------------------------------------------------+------------------+
| Id | User        | Host      | db   | Command | Time | State                                                  | Info             |
+----+-------------+-----------+------+---------+------+--------------------------------------------------------+------------------+
|  1 | system user |           | NULL | Connect |  193 | Slave has read all relay log; waiting for more updates | NULL             |
|  2 | system user |           | NULL | Connect |  194 | Waiting for master to send event                       | NULL             |
|  3 | system user |           | NULL | Connect |  194 | Waiting for an event from Coordinator                  | NULL             |
|  4 | system user |           | NULL | Connect |  194 | Waiting for an event from Coordinator                  | NULL             |
|  6 | system user |           | NULL | Connect |  194 | Waiting for an event from Coordinator                  | NULL             |
|  7 | system user |           | NULL | Connect |  194 | Waiting for an event from Coordinator                  | NULL             |
|  8 | system user |           | NULL | Connect |  194 | Waiting for an event from Coordinator                  | NULL             |
|  9 | system user |           | NULL | Connect |  194 | Waiting for an event from Coordinator                  | NULL             |
| 10 | system user |           | NULL | Connect |  194 | Waiting for an event from Coordinator                  | NULL             |
| 11 | system user |           | NULL | Connect |  194 | Waiting for an event from Coordinator                  | NULL             |
| 12 | system user |           | NULL | Connect |  194 | Waiting for an event from Coordinator                  | NULL             |
| 13 | system user |           | NULL | Connect |  194 | Waiting for an event from Coordinator                  | NULL             |
| 14 | system user |           | NULL | Connect |  194 | Waiting for an event from Coordinator                  | NULL             |
| 16 | system user |           | NULL | Connect |  194 | Waiting for an event from Coordinator                  | NULL             |
| 17 | system user |           | NULL | Connect |  194 | Waiting for an event from Coordinator                  | NULL             |
| 18 | system user |           | NULL | Connect |  194 | Waiting for an event from Coordinator                  | NULL             |
| 19 | system user |           | NULL | Connect |  194 | Waiting for an event from Coordinator                  | NULL             |
| 20 | system user |           | NULL | Connect |  194 | Waiting for an event from Coordinator                  | NULL             |
| 22 | root        | localhost | NULL | Query   |    0 | starting                                               | show processlist |
+----+-------------+-----------+------+---------+------+--------------------------------------------------------+------------------+

4、Slave端檢視mysql資料庫的表，新增兩張表

mysql> use mysql;
mysql> show tables;