mysql5.7主从复制原理及基本配置
mysql主从复制原理:
传统的mysql复制就是主-从复制,它会有一个主,一个或多个从,在主节点提交与执行完事物之后,通过bin-log(2进制日志),将其(异步的)通过从节点上的IO线程发送到从节点上，并将bin-log日志存到从节点的readly-log(中继日志)中，通过sql线程以重新执行(在基于语句的复制中),或应用(在基于行的复制中),
当从节点连上主节点后,会向主节点发送上次同步的位置,主节点将日志文件发给从节点
mysql主从复制 (二进制方式,异步复制)
mysql的安装
wget https://dev.mysql.com/get/Downloads/MySQL-5.7/mysql-5.7.17-1.el6.x86_64.rpm-bundle.tar
[root@server1 ~]# tar xf mysql-5.7.17-1.el6.x86_64.rpm-bundle.tar
[root@server1 ~]# ls
mysql-5.7.17-1.el6.x86_64.rpm-bundle.tar mysql-community-embedded-devel-5.7.17-1.el6.x86_64.rpm
mysql-community-client-5.7.17-1.el6.x86_64.rpm mysql-community-libs-5.7.17-1.el6.x86_64.rpm
mysql-community-common-5.7.17-1.el6.x86_64.rpm mysql-community-libs-compat-5.7.17-1.el6.x86_64.rpm
mysql-community-devel-5.7.17-1.el6.x86_64.rpm mysql-community-server-5.7.17-1.el6.x86_64.rpm
mysql-community-embedded-5.7.17-1.el6.x86_64.rpm mysql-community-test-5.7.17-1.el6.x86_64.rpm
[root@server1 ~]# yum install mysql-community-client-5.7.17-1.el6.x86_64.rpm mysql-community-common-5.7.17-1.el6.x86_64.rpm mysql-community-libs-5.7.17-1.el6.x86_64.rpm mysql-community-libs-compat-5.7.17-1.el6.x86_64.rpm mysql-community-server-5.7.17-1.el6.x86_64.rpm -y进行初始化设置
[root@server1 ~]# /etc/init.d/mysqld restart
[root@server1 mnt]# cat /var/log/mysqld.log |grep password
2018-10-18T09:11:31.491475Z 1 [Note] A temporary password is generated for root@localhost: pNa+fASiH2TI
#在日志中可以看到mysql初始化密码
2018-10-18T09:11:39.126053Z 0 [Note] Execution of init_file '/var/lib/mysql/install-validate-password-plugin.lzg4k7.sql' started.
2018-10-18T09:11:39.152990Z 0 [Note] Execution of init_file '/var/lib/mysql/install-validate-password-plugin.lzg4k7.sql' ended.
修改mysql密码
方式1
[root@server1 ~]# mysql_secure_installation
方式2
ALTER USER root@localhost identified by 'Redhat123...'; #进入数据库修改密码登陆测试
server2作同样的配置！！！
异步复制的配置（pos方式）
master
配置my.cnf
binlog-do-db=test #二进制需要同步的数据库名,如果需要同步多个库,例如要再同步 test1库,再添加一行“binlog-do-db=test1”,以此类推
binlog-ignore-db=mysql #禁止同步 mysql 数据库[root@server1 ~]# vim /etc/my.cnf
server-id=1 ###2的32次方减1，唯一标识符，不能一样
##可以认为 server-id 值类似于 IP 地址:这些 ID 值能唯一识别复制服务器群集中的每个服务器实例。
log-bin=master-bin ###启动二进制日志slave
配置my.cnf
replicate-do-db=redhat #从服务器同步redhat数据库
replicate-ignore-db=redhat #从服务器不同步redhat数据库
replicate-do-table=redhat.test #备份redhat库中的test表
replicate-ignore-table=redhat.test #不备份redhat库中的test表
replicate-wild-do-table=redhat.test%
replicate-wild-ignore-table=redhat.test% server-id=2
server2不需要去发送2进制日志给别的服务器，因此不需要打开log-bin进入数据库
master
1：创建可以进行复制的slave用户repl
mysql> grant replication slave on *.* to 'repl'@'172.25.1.%' identified by 'Redhat123...';
Query OK, 0 rows affected, 0 warning (0.04 sec)
2：刷新授权
mysql> flush privileges;
Query OK, 0 rows affected (0.17 sec)
3：查看master状态
mysql> show master status;
+----------------------+----------+--------------+------------------+-------------------+
| File | Position | Binlog_Do_DB | Binlog_Ignore_DB | Executed_Gtid_Set |
+----------------------+----------+--------------+------------------+-------------------+
| master-logbin.000001 | 446 | | | |
+----------------------+----------+--------------+------------------+-------------------+
1 row in set (0.00 sec)slave
连接
mysql> change master to master_host='172.25.1.1',master_user='repl',master_password='Redhat123...',master_log_file='mysql-bin.000001',master_log_pos=446;
Query OK, 0 rows affected, 2 warnings (1.70 sec)
mysql> show slave status\G;
*************************** 1. row ***************************
Slave_IO_State:
Master_Host: 172.25.1.1
Master_User: repl
Master_Port: 3306
Connect_Retry: 60
Master_Log_File: master-logbin.000001
Read_Master_Log_Pos: 446
Relay_Log_File: server2-relay-bin.000001
Relay_Log_Pos: 4
Relay_Master_Log_File: master-logbin.000001
Slave_IO_Running: No
Slave_SQL_Running: No
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: 446
Relay_Log_Space: 154
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: NULL
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: 0
Master_UUID:
Master_Info_File: /var/lib/mysql/master.info
SQL_Delay: 0
SQL_Remaining_Delay: NULL
Slave_SQL_Running_State:
Master_Retry_Count: 86400
Master_Bind:
Last_IO_Error_Timestamp:
Last_SQL_Error_Timestamp:
Master_SSL_Crl:
Master_SSL_Crlpath:
Retrieved_Gtid_Set:
Executed_Gtid_Set:
Auto_Position: 0
Replicate_Rewrite_DB:
Channel_Name:
Master_TLS_Version:
1 row in set (0.00 sec)
ERROR:
No query specified
#可以看到当没有启动slave时，io线程和sql线程是没有启用的
mysql> start slave;
Query OK, 0 rows affected (0.17 sec)
mysql> show slave status\G;
*************************** 1. row ***************************
Slave_IO_State: Waiting for master to send event
Master_Host: 172.25.1.1
Master_User: repl
Master_Port: 3306
Connect_Retry: 60
Master_Log_File: master-logbin.000001
Read_Master_Log_Pos: 446
Relay_Log_File: server2-relay-bin.000002
Relay_Log_Pos: 324
Relay_Master_Log_File: master-logbin.000001
Slave_IO_Running: Yes #当IO线程和SQL线程都是Yes时表示主从正常
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: 446
Relay_Log_Space: 533
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: 1
Master_UUID: cd947c57-d2b5-11e8-91ae-525400d8c130
Master_Info_File: /var/lib/mysql/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:
Executed_Gtid_Set:
Auto_Position: 0
Replicate_Rewrite_DB:
Channel_Name:
Master_TLS_Version:
1 row in set (0.00 sec)
ERROR:
No query specified在异步复制中，因为从服务器是和主进行同步的，从服务器可以将写的事件同步到从服务器中，但是从服务器无法将二进制日志同步到主服务器中，因此不能在从服务器的mysql中进行写入操作，否则复制会出现问题，一般会在从服务器中添加read-only=yes来限制从服务器写入,但是read-only不对super用户生效
测试
在主节点上插入数据
在从服务器上进行查询
数据已经进行了同步
主服务器上master的状态
mysql> show master status;
+----------------------+----------+--------------+------------------+-------------------+
| File | Position | Binlog_Do_DB | Binlog_Ignore_DB | Executed_Gtid_Set |
+----------------------+----------+--------------+------------------+-------------------+
| master-logbin.000001 | 1360 | | | |
+----------------------+----------+--------------+------------------+-------------------+
1 row in set (0.00 sec)
从服务器上slave的状态
mysql> show slave status\G;
*************************** 1. row ***************************
Slave_IO_State: Waiting for master to send event
Master_Host: 172.25.1.1
Master_User: repl
Master_Port: 3306
Connect_Retry: 60
Master_Log_File: master-logbin.000001
Read_Master_Log_Pos: 1360
Relay_Log_File: server2-relay-bin.000002
Relay_Log_Pos: 1238
Relay_Master_Log_File: master-logbin.000001
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: 1360
Relay_Log_Space: 1447
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: 1
Master_UUID: cd947c57-d2b5-11e8-91ae-525400d8c130
Master_Info_File: /var/lib/mysql/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:
Executed_Gtid_Set:
Auto_Position: 0
Replicate_Rewrite_DB:
Channel_Name:
Master_TLS_Version:
1 row in set (0.00 sec)
ERROR:
No query specified
通过GTID实现主从复制
GITD是唯一标示符是由服务器的UUID(全局唯一标示对于任何一个服务器都是128位随机符)并结合事务ID号来组合成一个唯一的标示，某一个主机上某一个事务的标识码 就叫做**GTID**
自从引入GTID之后 MySQL5.6的binlog在每一个事务的首部都会写上GTID的标示，在二进制文件中，每一个事务的语句记录下来的时候在这个事件首部会把相关联的GTID给记录下来。
因此GTID使得追踪和比较复制事务变得非常简单，而且能够实现从崩溃中快速进行恢复。配置GTID
server1中对my.cnf添加的配置
[root@server1 ~]# vim /etc/my.cnf
server-id=1
log-bin=master-logbin
gtid_mode=ON
enforce-gtid-consistency=true
[root@server1 ~]# /etc/init.d/mysqld restartserver2中对my.cnf添加的配置
[root@server2 ~]# vim /etc/my.cnf
server-id=2
gtid_mode=ON
enforce-gtid-consistency=true
[root@server2 ~]# /etc/init.d/mysqld restart
配置基于GTID的异步复制（server2）
（1）关闭之前的主从复制在配置GTID主从复制
mysql> stop slave;
Query OK, 0 rows affected (0.00 sec)
mysql> change master to master_host='172.25.1.1',master_user='repl',master_password='Redhat123...',master_auto_position=1;
Query OK, 0 rows affected, 2 warnings (0.02 sec)
mysql> start slave;
Query OK, 0 rows affected (0.00 sec)
（2）查看从服务器的状态
mysql> show slave status\G;
*************************** 1. row ***************************
Slave_IO_State: Waiting for master to send event
Master_Host: 172.25.1.1
Master_User: repl
Master_Port: 3306
Connect_Retry: 60
Master_Log_File: master-logbin.000004
Read_Master_Log_Pos: 459
Relay_Log_File: server2-relay-bin.000002
Relay_Log_Pos: 426
Relay_Master_Log_File: master-logbin.000004
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: 459
Relay_Log_Space: 675
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: 1
Master_UUID: cd947c57-d2b5-11e8-91ae-525400d8c130
Master_Info_File: /var/lib/mysql/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:
Executed_Gtid_Set: cd947c57-d2b5-11e8-91ae-525400d8c130:1-2
Auto_Position: 1
Replicate_Rewrite_DB:
Channel_Name:
Master_TLS_Version:
1 row in set (0.00 sec)
ERROR:
No query specified
(3)查看server1的uuid及日志
[root@server1 mysql]# cat auto.cnf
[auto]
server-uuid=cd947c57-d2b5-11e8-91ae-525400d8c130
[root@server1 mysql]# ls
auto.cnf ib_buffer_pool master-logbin.000001 mysql private_key.pem test
ca-key.pem ibdata1 master-logbin.000002 mysqld_safe.pid public_key.pem
ca.pem ib_logfile0 master-logbin.000003 mysql.sock server-cert.pem
client-cert.pem ib_logfile1 master-logbin.000004 mysql.sock.lock server-key.pem
client-key.pem ibtmp1 master-logbin.index performance_schema sys
[root@server1 mysql]# mysqlbinlog master-logbin.000002
/*!50530 SET @@SESSION.PSEUDO_SLAVE_MODE=1*/;
/*!50003 SET @OLD_COMPLETION_TYPE=@@COMPLETION_TYPE,COMPLETION_TYPE=0*/;
DELIMITER /*!*/;
# at 4
#181018 18:45:39 server id 1 end_log_pos 123 CRC32 0x5f47a665 Start: binlog v 4, server v 5.7.17-log created 181018 18:45:39 at startup
ROLLBACK/*!*/;
BINLOG '
U2TIWw8BAAAAdwAAAHsAAAAAAAQANS43LjE3LWxvZwAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAABTZMhbEzgNAAgAEgAEBAQEEgAAXwAEGggAAAAICAgCAAAACgoKKioAEjQA
AWWmR18=
'/*!*/;
# at 123
#181018 18:45:39 server id 1 end_log_pos 154 CRC32 0xb70dbe9e Previous-GTIDs
# [empty]
# at 154
#181018 18:50:49 server id 1 end_log_pos 177 CRC32 0x96a5f640 Stop
SET @@SESSION.GTID_NEXT= 'AUTOMATIC' /* added by mysqlbinlog */ /*!*/;
DELIMITER ;
# End of log file
/*!50003 SET COMPLETION_TYPE=@OLD_COMPLETION_TYPE*/;
/*!50530 SET @@SESSION.PSEUDO_SLAVE_MODE=0*/;
mysql启动多线程
MySQL的多线程复制不是一个新的东西，在5,7之前就已经有了，在5.7上进行了增强；
多线程复制可以减轻主从复制的延迟；
从服务器中一个线程只能针对一个数据库进行复制，显得有些鸡肋；但是大部分操作有可能都是对一个库的操作；
在MySQL5.7中的多线程复制可以看做是基于table的，这样就可以提高效率；
配置my.cnf（server2）
[root@server2 ~]# vim /etc/my.cnf
slave-parallel-type=LOGICAL_CLOCK
slave-parallel-workers=16 # ###打开16个线程，原先的进程变成调度器
###下面是优化参数
master_info_repository=TABLE
relay_log_info_repository=TABLE
relay_log_recovery=ON
symbolic-links=0
[root@server2 ~]# /etc/init.d/mysqld restart查看（server2）
（1）未修改配置
mysql> use mysql;
Database changed
mysql> show tables;
+---------------------------+
| Tables_in_mysql |
+---------------------------+
| columns_priv |
| db |
| engine_cost |
| event |
| func |
| general_log |
| gtid_executed |
| help_category |
| help_keyword |
| help_relation |
| help_topic |
| innodb_index_stats |
| innodb_table_stats |
| ndb_binlog_index |
| plugin |
| proc |
| procs_priv |
| proxies_priv |
| server_cost |
| servers |
| slave_master_info |
| slave_relay_log_info |
| slave_worker_info |
| slow_log |
| tables_priv |
| time_zone |
| time_zone_leap_second |
| time_zone_name |
| time_zone_transition |
| time_zone_transition_type |
| user |
+---------------------------+
31 rows in set (0.00 sec)
mysql> select * from slave_relay_log_info\G;
*************************** 1. row ***************************
Number_of_lines: 7
Relay_log_name: ./server2-relay-bin.000005
Relay_log_pos: 4
Master_log_name: master-logbin.000004
Master_log_pos: 459
Sql_delay: 0
Number_of_workers: 0
Id: 1
Channel_name:
1 row in set (0.00 sec)
ERROR:
No query specified
mysql> show processlist;
+----+-------------+-----------+------+---------+------+--------------------------------------------------------+------------------+
| Id | User | Host | db | Command | Time | State | Info |
+----+-------------+-----------+------+---------+------+--------------------------------------------------------+------------------+
| 1 | system user | | NULL | Connect | 13 | Waiting for master to send event | NULL |
| 2 | system user | | NULL | Connect | 13 | Slave has read all relay log; waiting for more updates | NULL |
| 6 | root | localhost | NULL | Query | 0 | starting | show processlist |
+----+-------------+-----------+------+---------+------+--------------------------------------------------------+------------------+
3 rows in set (0.00 sec)
（2）修改配置
mysql> show databases;
+--------------------+
| Database |
+--------------------+
| information_schema |
| mysql |
| performance_schema |
| sys |
| test |
+--------------------+
5 rows in set (0.00 sec)
mysql> use mysql;
Database changed
mysql> select * from slave_relay_log_info\G;
*************************** 1. row ***************************
Number_of_lines: 7
Relay_log_name: ./server2-relay-bin.000007
Relay_log_pos: 4
Master_log_name: master-logbin.000004
Master_log_pos: 459
Sql_delay: 0
Number_of_workers: 16
Id: 1
Channel_name:
1 row in set (0.00 sec)
ERROR:
No query specified
mysql> show processlist;
+----+-------------+-----------+------+---------+------+--------------------------------------------------------+------------------+
| Id | User | Host | db | Command | Time | State | Info |
+----+-------------+-----------+------+---------+------+--------------------------------------------------------+------------------+
| 1 | system user | | NULL | Connect | 52 | Slave has read all relay log; waiting for more updates | NULL |
| 2 | system user | | NULL | Connect | 52 | Waiting for master to send event | NULL |
| 3 | system user | | NULL | Connect | 52 | Waiting for an event from Coordinator | NULL |
| 4 | system user | | NULL | Connect | 52 | Waiting for an event from Coordinator | NULL |
| 6 | system user | | NULL | Connect | 52 | Waiting for an event from Coordinator | NULL |
| 7 | system user | | NULL | Connect | 52 | Waiting for an event from Coordinator | NULL |
| 8 | system user | | NULL | Connect | 52 | Waiting for an event from Coordinator | NULL |
| 9 | system user | | NULL | Connect | 52 | Waiting for an event from Coordinator | NULL |
| 10 | system user | | NULL | Connect | 52 | Waiting for an event from Coordinator | NULL |
| 11 | system user | | NULL | Connect | 52 | Waiting for an event from Coordinator | NULL |
| 12 | system user | | NULL | Connect | 52 | Waiting for an event from Coordinator | NULL |
| 13 | system user | | NULL | Connect | 52 | Waiting for an event from Coordinator | NULL |
| 14 | system user | | NULL | Connect | 52 | Waiting for an event from Coordinator | NULL |
| 16 | system user | | NULL | Connect | 52 | Waiting for an event from Coordinator | NULL |
| 17 | system user | | NULL | Connect | 52 | Waiting for an event from Coordinator | NULL |
| 18 | system user | | NULL | Connect | 52 | Waiting for an event from Coordinator | NULL |
| 19 | system user | | NULL | Connect | 52 | Waiting for an event from Coordinator | NULL |
| 20 | system user | | NULL | Connect | 52 | Waiting for an event from Coordinator | NULL |
| 22 | root | localhost | NULL | Query | 0 | starting | show processlist |
+----+-------------+-----------+------+---------+------+--------------------------------------------------------+------------------+
19 rows in set (0.00 sec)
半同步复制配置
几种不同复制的概念
异步复制：其为Mysql的默认模式，Master在执行完Client所提交的事务会将结果立即返回给Client，但是并不关心Slave是否接收并处理，如果此时Master宕机，主上已经提交的事务可能并没有传到Slave上，Slave提升为Master，数据也会可能不完整。
全同步复制：当Master接受到Client所提交的事务，会等Slave执行了该事务在把结果返回给Client，因此必定有大量的性能损失。
半同步复制（版本5.7）：介于异步复制和全同步复制之间，Master在执行了Client所提交的事务后不会立即返回给 Client，而是等待至少有一个Salve的relay log接受到bin log才返回给Client，大大提高了的数据的安全性。如果Slave响应超时（默认为10s）以后，半同步复制会切换为异步复制，在Slave恢复以后，会切换到半同步复制，并且数据会进行同步
配置
我们可以通过在SQL中配置，也可以通过配置my.cnf文件实现永久生效！！！
（1）通过SQL配置（临时生效）
<1> 加载Master插件（server1）
mysql> install plugin rpl_semi_sync_master soname 'semisync_master.so';
UNINSTALL PLUGIN rpl_semi_sync_master;
#取消加载插件
mysql> set global rpl_semi_sync_master_enabled=ON;
mysql> show global variables like '%semi%';
+-------------------------------------------+------------+
| Variable_name | Value |
+-------------------------------------------+------------+
| rpl_semi_sync_master_enabled | ON |
| rpl_semi_sync_master_timeout | 10000 |
| 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 |
+-------------------------------------------+------------+
mysql> SELECT PLUGIN_NAME, PLUGIN_STATUS FROM INFORMATION_SCHEMA.PLUGINS WHERE PLUGIN_NAME LIKE '%semi%';
+----------------------+---------------+
| PLUGIN_NAME | PLUGIN_STATUS |
+----------------------+---------------+
| rpl_semi_sync_master | ACTIVE |
+----------------------+---------------+
1 row in set (0.00 sec)
<2> 从节点配置
mysql> install plugin rpl_semi_sync_slave soname 'semisync_slave.so';
UNINSTALL PLUGIN rpl_semi_sync_slave;
#取消加载插件
mysql> set global rpl_semi_sync_slave_enabled=ON;
mysql> stop slave io_thread;
mysql> start slave io_thread;
mysql> show global variables like '%semi%';
+---------------------------------+-------+
| Variable_name | Value |
+---------------------------------+-------+
| rpl_semi_sync_slave_enabled | ON |
| rpl_semi_sync_slave_trace_level | 32 |
+---------------------------------+-------+<2> 测试
###主服务器###
mysql> show global status like 'rpl_se%';
+--------------------------------------------+-------+
| Variable_name | Value |
+--------------------------------------------+-------+
| Rpl_semi_sync_master_clients | 1 | #半同步连接数,如果Value=1证明主从半同步复制链接成功
| Rpl_semi_sync_master_net_avg_wait_time | 0 |
| Rpl_semi_sync_master_net_wait_time | 0 |
| Rpl_semi_sync_master_net_waits | 1 |
| Rpl_semi_sync_master_no_times | 1 |
| Rpl_semi_sync_master_no_tx | 1 | ###失败次数
| Rpl_semi_sync_master_status | ON | ###连接状态
| Rpl_semi_sync_master_timefunc_failures | 0 |
| Rpl_semi_sync_master_tx_avg_wait_time | 349 |
| Rpl_semi_sync_master_tx_wait_time | 349 |
| Rpl_semi_sync_master_tx_waits | 1 |
| Rpl_semi_sync_master_wait_pos_backtraverse | 0 |
| Rpl_semi_sync_master_wait_sessions | 0 |
| Rpl_semi_sync_master_yes_tx | 1 | ###成功次数
+--------------------------------------------+-------+
14 rows in set (0.00 sec)
###从服务器###
mysql> show global status like 'rpl_semi%';
+----------------------------+-------+
| Variable_name | Value |
+----------------------------+-------+
| Rpl_semi_sync_slave_status | ON |
+----------------------------+-------+
###从服务器###
mysql> stop slave io_thread; #停掉slave的io线程
Query OK, 0 rows affected (0.01 sec)
###主服务器###
mysql> insert into user values (8,'xxxx'); #在主服务插入数据
Query OK, 1 row affected (10.00 sec) #延迟10s以后插入成功
###从服务器###
mysql> select * from user; 从服务器中没有添加成功
+------+--------+
| id | name |
+------+--------+
| 1 | redhat |
+------+--------+
6 rows in set (0.00 sec)
mysql> show global status like '%rpl_se%';
+--------------------------------------------+-------+
| Variable_name | Value |
+--------------------------------------------+-------+
| Rpl_semi_sync_master_clients | 0 | #连接数为0
| Rpl_semi_sync_master_net_avg_wait_time | 0 |
| Rpl_semi_sync_master_net_wait_time | 0 |
| Rpl_semi_sync_master_net_waits | 3 |
| Rpl_semi_sync_master_no_times | 3 |
| Rpl_semi_sync_master_no_tx | 3 |
| Rpl_semi_sync_master_status | OFF |
| Rpl_semi_sync_master_timefunc_failures | 0 |
| Rpl_semi_sync_master_tx_avg_wait_time | 628 |
| Rpl_semi_sync_master_tx_wait_time | 1257 |
| Rpl_semi_sync_master_tx_waits | 2 |
| Rpl_semi_sync_master_wait_pos_backtraverse | 0 |
| Rpl_semi_sync_master_wait_sessions | 0 |
| Rpl_semi_sync_master_yes_tx | 2 |
+--------------------------------------------+-------+
14 rows in set (0.00 sec)
###从服务器###
mysql> show global status like 'rpl_semi%'；
+----------------------------+-------+
| Variable_name | Value |
+----------------------------+-------+
| Rpl_semi_sync_slave_status | OFF | ##半同步已经关闭
+----------------------------+-------+
1 row in set (0.00 sec)
mysql> start slave io_thread; #打开slave的io线程
Query OK, 0 rows affected (0.00 sec)
mysql> select * from user; #查看数据添加成功
+------+--------+
| id | name |
+------+--------+
| 1 | redhat |
| 8 | xxxx |
+------+--------+
7 rows in set (0.00 sec)
###主服务器###
mysql> show global status like '%rpl_se%';
+--------------------------------------------+-------+
| Variable_name | Value |
+--------------------------------------------+-------+
| Rpl_semi_sync_master_clients | 1 | #半同步重新连接上
| Rpl_semi_sync_master_net_avg_wait_time | 0 |
| Rpl_semi_sync_master_net_wait_time | 0 |
| Rpl_semi_sync_master_net_waits | 5 |
| Rpl_semi_sync_master_no_times | 3 |
| Rpl_semi_sync_master_no_tx | 3 |
| Rpl_semi_sync_master_status | ON |
| Rpl_semi_sync_master_timefunc_failures | 0 |
| Rpl_semi_sync_master_tx_avg_wait_time | 538 |
| Rpl_semi_sync_master_tx_wait_time | 1615 |
| Rpl_semi_sync_master_tx_waits | 3 |
| Rpl_semi_sync_master_wait_pos_backtraverse | 0 |
| Rpl_semi_sync_master_wait_sessions | 0 |
| Rpl_semi_sync_master_yes_tx | 3 |
+--------------------------------------------+-------+
14 rows in set (0.00 sec)
###从服务器###
mysql> show global status like 'rpl_se%';
+----------------------------+-------+
| Variable_name | Value |
+----------------------------+-------+
| Rpl_semi_sync_slave_status | ON | #半同步已经打开
+----------------------------+-------+
1 row in set (0.00 sec)
超时时间查询（Master）
mysql> show variables like 'rpl_semi_sync_master_timeout';
+------------------------------+-------+
| Variable_name | Value |
+------------------------------+-------+
| rpl_semi_sync_master_timeout | 10000 |
+------------------------------+-------+
1 row in set (0.01 sec)