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背景：
目前MySQL依然只支持一个Slave从一个Master复制数据，虽然也可以做到一主多备(M->S)，双主复制(M<->M)等架构，但是局限性依然很大。由于项目的要求，需要各个主库的表整合到一个地方进行统计和分析，要是每次连不同的实例操作，是一件非常耗体力的操作。所以继续一种类似多主一从的实例。
安装：
sudo apt-get install software-properties-common
sudo apt-key adv --recv-keys --keyserver hkp://keyserver.ubuntu.com:80 0xcbcb082a1bb943db
sudo add-apt-repository 'deb http://mirrors.hustunique.com/mariadb/repo/10.0/ubuntu trusty main'
sudo apt-get update
sudo apt-get install mariadb-server
环境搭建：
Master 1：200.51(MySQL)
Master 2：200.52(MySQL)
Slave ：200.73(MariaDB) 修改好server-id
确认好Master的POS：
M1:
rep@192.168.200.51 : (none) 10:26:11>show master status;
+--------------------+----------+--------------+------------------+
| File | Position | Binlog_Do_DB | Binlog_Ignore_DB |
+--------------------+----------+--------------+------------------+
| mysql-bin51.000013 | 107 | | test |
+--------------------+----------+--------------+------------------+
1 row in set (0.01 sec)
M2：
rep@192.168.200.52 : r2 10:26:23>show master status; +---------------------+----------+--------------+------------------+
| File | Position | Binlog_Do_DB | Binlog_Ignore_DB |
+---------------------+----------+--------------+------------------+
| mysql-bin_52.000106 | 107 | | test |
+---------------------+----------+--------------+------------------+
1 row in set (0.00 sec)
Slave 操作：
MariaDB [(none)]> change master 'r1' to master_host='192.168.200.51',master_user='rep',master_password='rep123456',master_log_file='mysql-bin51.000013',master_log_pos=107;
Query OK, 0 rows affected (0.23 sec)
MariaDB [(none)]> change master 'r2' to master_host='192.168.200.52',master_user='rep',master_password='rep123456',master_log_file='mysql-bin_52.000106',master_log_pos=107;
Query OK, 0 rows affected (0.25 sec)
MariaDB的change方法和MySQL有点不一样，多了一个 ['connection_name'] ，这个就是多主一从的关键。为每个主设置一个通道标识，这样就可以支持多主复制了。
如何保存复制的信息？单主复制会把复制信息保存在master.info中，在多主复制中的保存也类似，只是在最后加上通道标识名称。如：
-rw-rw---- 1 mysql mysql 113 11月 17 10:30 master-r1.info
-rw-rw---- 1 mysql mysql 114 11月 17 10:31 master-r2.info
-rw-rw---- 1 mysql mysql 248 11月 17 10:30 mysqld-relay-bin-r1.000001
-rw-rw---- 1 mysql mysql 29 11月 17 10:30 mysqld-relay-bin-r1.index
-rw-rw---- 1 mysql mysql 248 11月 17 10:31 mysqld-relay-bin-r2.000001
-rw-rw---- 1 mysql mysql 29 11月 17 10:31 mysqld-relay-bin-r2.index
-rw-rw---- 1 mysql mysql 54 11月 17 10:30 relay-log-r1.info
-rw-rw---- 1 mysql mysql 55 11月 17 10:31 relay-log-r2.info
查看同步：
#查看所有通道
MariaDB [(none)]> show all slaves status\G;
*************************** 1. row ***************************
Connection_name: r1
Slave_SQL_State:
Slave_IO_State:
Master_Host: 192.168.200.51
Master_User: rep
Master_Port: 3306
Connect_Retry: 60
Master_Log_File: mysql-bin51.000013
Read_Master_Log_Pos: 107
Relay_Log_File: mysqld-relay-bin-r1.000001
Relay_Log_Pos: 4
Relay_Master_Log_File: mysql-bin51.000013
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: 107
Relay_Log_Space: 248
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_SSL_Crl:
Master_SSL_Crlpath:
Using_Gtid: No
Gtid_IO_Pos:
Retried_transactions: 0
Max_relay_log_size: 104857600
Executed_log_entries: 0
Slave_received_heartbeats: 0
Slave_heartbeat_period: 1800.000
Gtid_Slave_Pos:
*************************** 2. row ***************************
Connection_name: r2
Slave_SQL_State:
Slave_IO_State:
Master_Host: 192.168.200.52
Master_User: rep
Master_Port: 3306
Connect_Retry: 60
Master_Log_File: mysql-bin_52.000106
Read_Master_Log_Pos: 107
Relay_Log_File: mysqld-relay-bin-r2.000001
Relay_Log_Pos: 4
Relay_Master_Log_File: mysql-bin_52.000106
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: 107
Relay_Log_Space: 248
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_SSL_Crl:
Master_SSL_Crlpath:
Using_Gtid: No
Gtid_IO_Pos:
Retried_transactions: 0
Max_relay_log_size: 104857600
Executed_log_entries: 0
Slave_received_heartbeats: 0
Slave_heartbeat_period: 1800.000
Gtid_Slave_Pos:
2 rows in set (0.00 sec)
ERROR: No query specified
#查看单个通道
MariaDB [(none)]> show slave 'r1' status\G;
*************************** 1. row ***************************
Slave_IO_State:
Master_Host: 192.168.200.51
Master_User: rep
Master_Port: 3306
Connect_Retry: 60
Master_Log_File: mysql-bin51.000013
Read_Master_Log_Pos: 107
Relay_Log_File: mysqld-relay-bin-r1.000001
Relay_Log_Pos: 4
Relay_Master_Log_File: mysql-bin51.000013
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: 107
Relay_Log_Space: 248
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_SSL_Crl:
Master_SSL_Crlpath:
Using_Gtid: No
Gtid_IO_Pos:
1 row in set (0.00 sec)
ERROR: No query specified
MariaDB [(none)]> show slave 'r2' status\G;
*************************** 1. row ***************************
Slave_IO_State:
Master_Host: 192.168.200.52
Master_User: rep
Master_Port: 3306
Connect_Retry: 60
Master_Log_File: mysql-bin_52.000106
Read_Master_Log_Pos: 107
Relay_Log_File: mysqld-relay-bin-r2.000001
Relay_Log_Pos: 4
Relay_Master_Log_File: mysql-bin_52.000106
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: 107
Relay_Log_Space: 248
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_SSL_Crl:
Master_SSL_Crlpath:
Using_Gtid: No
Gtid_IO_Pos:
1 row in set (0.00 sec)
ERROR: No query specified
开启同步：
#开启单个通道
MariaDB [(none)]> start slave 'r1';
Query OK, 0 rows affected (0.00 sec)
MariaDB [(none)]> start slave 'r2';
Query OK, 0 rows affected (0.00 sec)
#关闭多个通道
MariaDB [(none)]> start all slaves;
Query OK, 0 rows affected, 2 warnings (0.01 sec)
MariaDB [(none)]> show warnings;
+-------+------+--------------------+
| Level | Code | Message |
+-------+------+--------------------+
| Note | 1937 | SLAVE 'r2' started |
| Note | 1937 | SLAVE 'r1' started |
+-------+------+--------------------+
2 rows in set (0.00 sec)
通过 show all slaves status 命令可知是否同步成功。
关闭同步：
#关闭单个通道
MariaDB [(none)]> stop slave 'r1';
Query OK, 0 rows affected (0.14 sec)
MariaDB [(none)]> stop slave 'r2';
Query OK, 0 rows affected (0.03 sec)
#关闭所有通道
MariaDB [(none)]> stop all slaves;
Query OK, 0 rows affected, 2 warnings (0.08 sec)
MariaDB [(none)]> show warnings;
+-------+------+--------------------+
| Level | Code | Message |
+-------+------+--------------------+
| Note | 1938 | SLAVE 'r2' stopped |
| Note | 1938 | SLAVE 'r1' stopped |
+-------+------+--------------------+
2 rows in set (0.00 sec)
多源复制在原先复制的基础上多了几个变量，现在来说明下：
MariaDB [(none)]> show all slaves status\G;
*************************** 1. row ***************************
Connection_name: r1 #master的连接名，通道名，第一个参数。
Slave_SQL_State: Slave has read all relay log; waiting for the slave I/O thread to update it
Slave_IO_State: Waiting for master to send event
Master_Host: 192.168.200.51
Master_User: rep
Master_Port: 3306
Connect_Retry: 60
Master_Log_File: mysql-bin51.000013
Read_Master_Log_Pos: 107
Relay_Log_File: mysqld-relay-bin-r1.000005
Relay_Log_Pos: 396
Relay_Master_Log_File: mysql-bin51.000013
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: 107
Relay_Log_Space: 845
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_SSL_Crl:
Master_SSL_Crlpath:
Using_Gtid: No
Gtid_IO_Pos:
Retried_transactions: 0 #这个连接重试事务的次数
Max_relay_log_size: 104857600 #relay log的最大值. 如果是0的话，那么在启动的时候就会被设置成max_binlog_size 的大小
Executed_log_entries: 17 #slave已经指向了多少个日志条目
Slave_received_heartbeats: 0 #我们从master收到了多少个心跳包
Slave_heartbeat_period: 1800.000 #多久从master请求一个心跳包 (以秒计算)
Gtid_Slave_Pos:
测试复制
Master 1:
rep@192.168.200.51 : (none) 01:52:34>show databases;
+--------------------+
| Database |
+--------------------+
| information_schema |
| mha_test |
| mysql |
| performance_schema |
| xtra_test |
+--------------------+
5 rows in set (0.00 sec)
rep@192.168.200.51 : (none) 01:52:37>create database r1 default charset utf8;
Query OK, 1 row affected (0.01 sec)
rep@192.168.200.51 : (none) 01:53:36>use r1;
Database changed
rep@192.168.200.51 : r1 01:53:44>create table r1(id int not null auto_increment primary key,name varchar(30))default charset utf8;
Query OK, 0 rows affected (1.35 sec)
rep@192.168.200.51 : r1 01:54:09>insert into r1(name) values('a'),('b'),('c');
Query OK, 3 rows affected (0.01 sec)
Records: 3 Duplicates: 0 Warnings: 0
rep@192.168.200.51 : r1 01:54:56>select * from r1;
+----+------+
| id | name |
+----+------+
| 1 | a |
| 2 | b |
| 3 | c |
+----+------+
3 rows in set (0.00 sec)
Master 2:
rep@192.168.200.52 : (none) 01:52:13>create database r2 default charset utf8;
Query OK, 1 row affected (0.01 sec)
rep@192.168.200.52 : (none) 01:54:27>use r2
Database changed
rep@192.168.200.52 : r2 01:54:30>create table r2(id int not null auto_increment primary key,name varchar(30))default charset utf8;
Query OK, 0 rows affected (0.23 sec)
rep@192.168.200.52 : r2 01:54:32>insert into r2(name) values('A'),('B'),('C');
Query OK, 3 rows affected (0.28 sec)
Records: 3 Duplicates: 0 Warnings: 0
rep@192.168.200.52 : r2 01:55:18>select * from r2;
+----+------+
| id | name |
+----+------+
| 1 | A |
| 2 | B |
| 3 | C |
+----+------+
3 rows in set (0.01 sec)
Slave:
MariaDB [(none)]> show databases;
+--------------------+
| Database |
+--------------------+
| information_schema |
| mysql |
| performance_schema |
| r1 |
| r2 |
+--------------------+
5 rows in set (0.00 sec)
MariaDB [(none)]> use r1;
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
MariaDB [r1]> select * from r1;
+----+------+
| id | name |
+----+------+
| 1 | a |
| 2 | b |
| 3 | c |
+----+------+
3 rows in set (0.00 sec)
MariaDB [r1]> use r2;
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
MariaDB [r2]> select * from r2;
+----+------+
| id | name |
+----+------+
| 1 | A |
| 2 | B |
| 3 | C |
+----+------+
3 rows in set (0.00 sec)
同步成功，那如何错误跳过呢（default_master_connection）？
在Master 1上创建r2数据库，因为Slave上存在，所以会报错：
Master 1：
rep@192.168.200.51 : r1 01:55:52>create database r2 default charset utf8;
Query OK, 1 row affected (0.01 sec)
rep@192.168.200.51 : r1 01:59:51>insert into r1(name) values('d'),('e'),('f');
Query OK, 3 rows affected (0.01 sec)
Records: 3 Duplicates: 0 Warnings: 0
rep@192.168.200.51 : r1 02:04:22>select * from r1;
+----+------+
| id | name |
+----+------+
| 1 | a |
| 2 | b |
| 3 | c |
| 4 | d |
| 5 | e |
| 6 | f |
+----+------+
6 rows in set (0.00 sec)
Slave ：
MariaDB [r2]> show slave 'r1' status\G;
*************************** 1. row ***************************
Slave_IO_State: Waiting for master to send event
Master_Host: 192.168.200.51
Master_User: rep
Master_Port: 3306
Connect_Retry: 60
Master_Log_File: mysql-bin51.000013
Read_Master_Log_Pos: 767
Relay_Log_File: mysqld-relay-bin-r1.000005
Relay_Log_Pos: 956
Relay_Master_Log_File: mysql-bin51.000013
Slave_IO_Running: Yes
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: 1007
Last_Error: Error 'Can't create database 'r2'; database exists' on query. Default database: 'r2'. Query: 'create database r2 default charset utf8'
Skip_Counter: 0
Exec_Master_Log_Pos: 667
Relay_Log_Space: 1505
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: 1007
Last_SQL_Error: Error 'Can't create database 'r2'; database exists' on query. Default database: 'r2'. Query: 'create database r2 default charset utf8'
Replicate_Ignore_Server_Ids:
Master_Server_Id: 1
Master_SSL_Crl:
Master_SSL_Crlpath:
Using_Gtid: No
Gtid_IO_Pos:
1 row in set (0.00 sec)
MariaDB [r1]> select * from r1;
+----+------+
| id | name |
+----+------+
| 1 | a |
| 2 | b |
| 3 | c |
+----+------+
3 rows in set (0.00 sec)
r1的同步失败了，那r2可以继续同步吗？
Master 2:
rep@192.168.200.52 : r2 01:55:59>insert into r2(name) values('D'),('E'),('F');
Query OK, 3 rows affected (0.01 sec)
Records: 3 Duplicates: 0 Warnings: 0
rep@192.168.200.52 : r2 02:02:19>select * from r2;
+----+------+
| id | name |
+----+------+
| 1 | A |
| 2 | B |
| 3 | C |
| 4 | D |
| 5 | E |
| 6 | F |
+----+------+
6 rows in set (0.01 sec)
Slave：
MariaDB [r2]> select * from r2;
+----+------+
| id | name |
+----+------+
| 1 | A |
| 2 | B |
| 3 | C |
| 4 | D |
| 5 | E |
| 6 | F |
+----+------+
6 rows in set (0.00 sec)
上面可以得出：r1同步失败之后，不影响r2的同步。想要r1同步正常，则需要忽略即跳过该错误。如：
MariaDB [r1]> stop slave 'r1';
Query OK, 0 rows affected (0.12 sec)
MariaDB [r1]> set @@default_master_connection='r1'; #这里是重点：指定一个通道，然后用单通道的sql_slave_skip_counter。
Query OK, 0 rows affected (0.00 sec)
MariaDB [r1]> select @@default_master_connection;
+-----------------------------+
| @@default_master_connection |
+-----------------------------+
| r1 |
+-----------------------------+
1 row in set (0.00 sec)
MariaDB [r1]> SET GLOBAL sql_slave_skip_counter =1;
Query OK, 0 rows affected (0.00 sec)
MariaDB [r1]> start slave 'r1';
Query OK, 0 rows affected (0.00 sec)
MariaDB [r1]> show slave 'r1' status\G;
*************************** 1. row ***************************
Slave_IO_State: Waiting for master to send event
Master_Host: 192.168.200.51
Master_User: rep
Master_Port: 3306
Connect_Retry: 60
Master_Log_File: mysql-bin51.000013
Read_Master_Log_Pos: 993
Relay_Log_File: mysqld-relay-bin-r1.000006
Relay_Log_Pos: 396
Relay_Master_Log_File: mysql-bin51.000013
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: 993
Relay_Log_Space: 1731
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_SSL_Crl:
Master_SSL_Crlpath:
Using_Gtid: No
Gtid_IO_Pos:
1 row in set (0.00 sec)
MariaDB [r1]> select * from r1;
+----+------+
| id | name |
+----+------+
| 1 | a |
| 2 | b |
| 3 | c |
| 4 | d |
| 5 | e |
| 6 | f |
+----+------+
6 rows in set (0.00 sec)
看到跳过/忽略错误之后，r1的复制就正常了。
从上面的测试上说明，在用多主一从的复制时，需要保证各个主的Master Schema 要唯一，不能有重复。
最后再看看如何初始化：
MariaDB [r1]> show all slaves status\G;
*************************** 1. row ***************************
Connection_name: r1
Slave_SQL_State: Slave has read all relay log; waiting for the slave I/O thread to update it
Slave_IO_State: Waiting for master to send event
Master_Host: 192.168.200.51
Master_User: rep
Master_Port: 3306
Connect_Retry: 60
Master_Log_File: mysql-bin51.000013
Read_Master_Log_Pos: 1376
Relay_Log_File: mysqld-relay-bin-r1.000006
Relay_Log_Pos: 779
Relay_Master_Log_File: mysql-bin51.000013
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: 1376
Relay_Log_Space: 2114
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_SSL_Crl:
Master_SSL_Crlpath:
Using_Gtid: No
Gtid_IO_Pos:
Retried_transactions: 0
Max_relay_log_size: 104857600
Executed_log_entries: 39
Slave_received_heartbeats: 4
Slave_heartbeat_period: 1800.000
Gtid_Slave_Pos:
*************************** 2. row ***************************
Connection_name: r2
Slave_SQL_State: Slave has read all relay log; waiting for the slave I/O thread to update it
Slave_IO_State: Waiting for master to send event
Master_Host: 192.168.200.52
Master_User: rep
Master_Port: 3306
Connect_Retry: 60
Master_Log_File: mysql-bin_52.000106
Read_Master_Log_Pos: 893
Relay_Log_File: mysqld-relay-bin-r2.000005
Relay_Log_Pos: 1183
Relay_Master_Log_File: mysql-bin_52.000106
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: 893
Relay_Log_Space: 1633
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: 2
Master_SSL_Crl:
Master_SSL_Crlpath:
Using_Gtid: No
Gtid_IO_Pos:
Retried_transactions: 0
Max_relay_log_size: 104857600
Executed_log_entries: 28
Slave_received_heartbeats: 4
Slave_heartbeat_period: 1800.000
Gtid_Slave_Pos:
2 rows in set (0.00 sec)
#单个通道初始化
MariaDB [r1]> reset slave 'r1' all;
ERROR 1198 (HY000): This operation cannot be performed as you have a running slave 'r1'; run STOP SLAVE 'r1' first
MariaDB [r1]> stop slave 'r1';
Query OK, 0 rows affected (0.03 sec)
MariaDB [r1]> reset slave 'r1' all;
Query OK, 0 rows affected (0.04 sec)
MariaDB [r1]> stop slave 'r2';
Query OK, 0 rows affected (0.02 sec)
MariaDB [r1]> reset slave 'r2' all;
Query OK, 0 rows affected (0.02 sec)
MariaDB [r1]> show all slaves status\G;
Empty set (0.00 sec)
#所有通道初始化
MariaDB [r1]> stop all slaves;
Query OK, 0 rows affected, 2 warnings (0.05 sec)
MariaDB [r1]> show warnings;
+-------+------+--------------------+
| Level | Code | Message |
+-------+------+--------------------+
| Note | 1938 | SLAVE 'r2' stopped |
| Note | 1938 | SLAVE 'r1' stopped |
+-------+------+--------------------+
2 rows in set (0.00 sec)
MariaDB [r1]> reset slave all; #执行时候发现只能让r1初始化，不能初始化r2。所以初始化还是要单通道执行。
总结：
经过上面的测试，实现了多个主实例的数据同步到一个从实例，这个就可以把集中做分析的数据表同步到一起进行分析处理，大大减少了数据的中间处理时间和安全，这里还有一点特别注意的是，在同步数据库的时候可以用过滤选项（Replicate_Do_Table、Replicate_Ignore_Table、Replicate_Wild_Do_Table、Replicate_Wild_Ignore_Table），看着需要同步自己需要的表，不需要把没必要的也同步过来。
更多信息见：
https://mariadb.com/kb/en/mariadb/documentation/replication/standard-replication/multi-source-replication/
http://www.penglixun.com/tech/database/diy_multi_master_replication.html
原文链接:http://www.cnblogs.com/zhoujinyi/p/4102984.html
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