1.安装相关的插件
show plugins; 查看模块 help --uninstall; 查看卸载模块
master: mysql> install plugin rpl_semi_sync_master soname 'semisync_master.so'; --安装 semisync_master.so插件 Query OK, 0 rows affected (0.03 sec) slave: root@localhost [zw3306]>install plugin rpl_semi_sync_slave soname 'semisync_slave.so'; --安装 semisync_slave.so插件 Query OK, 0 rows affected (0.00 sec) root@localhost [zw3306]>install plugin rpl_semi_sync_master soname 'semisync_master.so'; Query OK, 0 rows affected (0.00 sec)
2.修改的参数:
set global rpl_semi_sync_master_enabled=1; set global rpl_semi_sync_master_timeout=1000; set global rpl_semi_sync_slave_enabled=1;
也可以直接写到配置文件 [mysqld]
master: [mysqld] rpl_semi_sync_master_enabled = 1 rpl_semi_sync_master_timeout = 1000 # 1 second slave: [mysqld] rpl_semi_sync_slave_enabled = 1
修改了参数需要重启:
查看修改的参数
master: mysql> show global variables like '%rpl_semi%';
+-------------------------------------------+------------+ | Variable_name | Value | +-------------------------------------------+------------+ | rpl_semi_sync_master_enabled | ON | | rpl_semi_sync_master_timeout | 1000 | | rpl_semi_sync_master_trace_level | 32 | | rpl_semi_sync_master_wait_for_slave_count | 1 | | rpl_semi_sync_master_wait_no_slave | ON | | rpl_semi_sync_master_wait_point | AFTER_SYNC | +-------------------------------------------+------------+ 6 rows in set (0.00 sec)
slave: root@localhost [(none)]>show global variables like '%rpl_semi%';
+-------------------------------------------+------------+ | Variable_name | Value | +-------------------------------------------+------------+ | rpl_semi_sync_master_enabled | ON | | rpl_semi_sync_master_timeout | 1000 | | rpl_semi_sync_master_trace_level | 32 | | rpl_semi_sync_master_wait_for_slave_count | 1 | | rpl_semi_sync_master_wait_no_slave | ON | | rpl_semi_sync_master_wait_point | AFTER_SYNC | | rpl_semi_sync_slave_enabled | ON | | rpl_semi_sync_slave_trace_level | 32 | +-------------------------------------------+------------+ 8 rows in set (0.00 sec)
如果:如果原来是已经建好的复制结构很简单:
stop slave io_thread; start slave io_thread;
3.做同步
change master to master_host='192.168.26.233', master_port=3306, master_user='repl',master_password='repl', master_auto_position=1; root@localhost [(none)]>start slave; Query OK, 0 rows affected (0.01 sec) root@localhost [(none)]>show slave status\G; *************************** 1. row *************************** Slave_IO_State: Waiting for master to send event Master_Host: 192.168.26.233 Master_User: repl Master_Port: 3306 Connect_Retry: 60 Master_Log_File: mysql-bin.000002 Read_Master_Log_Pos: 194 Relay_Log_File: relay-bin.000004 Relay_Log_Pos: 407 Relay_Master_Log_File: mysql-bin.000002 Slave_IO_Running: Yes Slave_SQL_Running: Yes Replicate_Do_DB: Replicate_Ignore_DB: Replicate_Do_Table: Replicate_Ignore_Table: Replicate_Wild_Do_Table: Replicate_Wild_Ignore_Table: Last_Errno: 0 Last_Error: Skip_Counter: 0 Exec_Master_Log_Pos: 194 Relay_Log_Space: 861 Until_Condition: None Until_Log_File: Until_Log_Pos: 0 Master_SSL_Allowed: No Master_SSL_CA_File: Master_SSL_CA_Path: Master_SSL_Cert: Master_SSL_Cipher: Master_SSL_Key: Seconds_Behind_Master: 0 Master_SSL_Verify_Server_Cert: No Last_IO_Errno: 0 Last_IO_Error: Last_SQL_Errno: 0 Last_SQL_Error: Replicate_Ignore_Server_Ids: Master_Server_Id: 3306100 Master_UUID: 7e354a2c-6f5f-11e6-997d-005056a36f08 Master_Info_File: mysql.slave_master_info SQL_Delay: 0 SQL_Remaining_Delay: NULL Slave_SQL_Running_State: Slave has read all relay log; waiting for more updates Master_Retry_Count: 86400 Master_Bind: Last_IO_Error_Timestamp: Last_SQL_Error_Timestamp: Master_SSL_Crl: Master_SSL_Crlpath: Retrieved_Gtid_Set: 7e354a2c-6f5f-11e6-997d-005056a36f08:1-9 Executed_Gtid_Set: 7e354a2c-6f5f-11e6-997d-005056a36f08:1-9, ba0d5587-74d6-11e6-ab5c-005056a3f46e:1-2 Auto_Position: 1 Replicate_Rewrite_DB: Channel_Name: Master_TLS_Version: 1 row in set (0.00 sec) ERROR: No query specified
5.查看slave是否有数据
root@localhost [zw3306]>show tables;
+------------------+ | Tables_in_zw3306 | +------------------+ | t1 | +------------------+ 1 row in set (0.00 sec)
root@localhost [zw3306]>select * from t1;
+------+ | id | +------+ | 1 | | 2 | | 3 | | 4 | +------+ 4 rows in set (0.00 sec)
6. 怎么确认是同步还是半同步?
show global variables like '%semi%'; show global status like '%semi%';
master: root@localhost [zw3306]>show global status like '%semi%';
+--------------------------------------------+-------+ | Variable_name | Value | +--------------------------------------------+-------+ | Rpl_semi_sync_master_clients | 1 | 有多少个Semi-sync的备库 | Rpl_semi_sync_master_net_avg_wait_time | 0 | 事务提交后,等待备库响应的平均时间 | Rpl_semi_sync_master_net_wait_time | 0 | 等待网络响应的总次数 | Rpl_semi_sync_master_net_waits | 7 | 总的网络等待时间 | Rpl_semi_sync_master_no_times | 0 | 一共有几次从Semi-sync跌回普通状态 | Rpl_semi_sync_master_no_tx | 0 | 库未及时响应的事务数,如果这个值很大就有问题 | Rpl_semi_sync_master_status | ON | 主库上Semi-sync是否正常开启 | Rpl_semi_sync_master_timefunc_failures | 0 | 时间函数未正常工作的次数 | Rpl_semi_sync_master_tx_avg_wait_time | 410 | 开启Semi-sync,事务返回需要等待的平均时间 | Rpl_semi_sync_master_tx_wait_time | 2876 | 事务等待备库响应的总时间 | Rpl_semi_sync_master_tx_waits | 7 | 事务等待备库响应的总次数 | Rpl_semi_sync_master_wait_pos_backtraverse | 0 | 改变当前等待最小二进制日志的次数 | Rpl_semi_sync_master_wait_sessions | 0 | 当前有几个线程在等备库响应 | Rpl_semi_sync_master_yes_tx | 7 | Semi-sync模式下,成功的事务数 +--------------------------------------------+-------+ 15 rows in set (0.00 sec)
root@localhost [zw3306]>show global variables like '%semi%';
+-------------------------------------------+------------+ | Variable_name | Value | +-------------------------------------------+------------+ | rpl_semi_sync_master_enabled | ON | | rpl_semi_sync_master_timeout | 1000 | | rpl_semi_sync_master_trace_level | 32 | | rpl_semi_sync_master_wait_for_slave_count | 1 | | rpl_semi_sync_master_wait_no_slave | ON | | rpl_semi_sync_master_wait_point | AFTER_SYNC | | rpl_semi_sync_slave_enabled | ON | | rpl_semi_sync_slave_trace_level | 32 | +-------------------------------------------+------------+ 8 rows in set (0.00 sec)
Rpl_semi_sync_master_no_tx 如果这个值很大就有问题
也有其他的原因;
mysql> show global status like '%semi%';
+--------------------------------------------+-------+ | Variable_name | Value | +--------------------------------------------+-------+ | Rpl_semi_sync_master_clients | 1 | | Rpl_semi_sync_master_net_avg_wait_time | 0 | | Rpl_semi_sync_master_net_wait_time | 0 | | Rpl_semi_sync_master_net_waits | 17 | | Rpl_semi_sync_master_no_times | 1 | | Rpl_semi_sync_master_no_tx | 10 | 不是用半同步复制的 | Rpl_semi_sync_master_status | OFF | | Rpl_semi_sync_master_timefunc_failures | 0 | | Rpl_semi_sync_master_tx_avg_wait_time | 410 | | Rpl_semi_sync_master_tx_wait_time | 2876 | | Rpl_semi_sync_master_tx_waits | 7 | | Rpl_semi_sync_master_wait_pos_backtraverse | 0 | | Rpl_semi_sync_master_wait_sessions | 0 | | Rpl_semi_sync_master_yes_tx | 7 | +--------------------------------------------+-------+ 14 rows in set (0.01 sec)
操作10个事物,可以发现都是 Rpl_semi_sync_master_no_tx master接收到N个slave的应答后,才commit事物,等待1s用户可以设置应道slave的数量。 rpl_semi_sync_master_wait_for_slave_count=1 默认是1 set global rpl_semi_sync_master_wait_for_slave_count=2;
意思是多少个半同步的slave;
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