很久没有更新博客了，主要是公司事情比较多，最近终于闲下来了。然而5.7也GA了，有许多新的特性，其中现在可以进行在线设置复制过滤了。但是还是得停复制，不过不用重启实例了。方便了DBA们进行临时性的调整。下面就简单的测试一下。MySQL 5.7的安装有了很大的变化，我主要是安装的二进制版本。关于如何安装以及如何搭建好复制这种小事，相信聪明的你可以很快搞定。安装请参考http://dev.mysql.com/doc/refman/5.7/en/binary-installation.html
下面进行复制过滤设置测试。
mysql> show slave status\G *************************** 1. row *************************** Slave_IO_State: Waiting for master to send event Master_Host: 10.69.25.173 Master_User: repl Master_Port: 3306 Connect_Retry: 60 Master_Log_File: mysql-bin.000001 Read_Master_Log_Pos: 1902 Relay_Log_File: relaylog.000002 Relay_Log_Pos: 2068 Relay_Master_Log_File: mysql-bin.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: 1902
可以看见现在并没有复制过滤的设置，现在进行调整。设置只同步db1，db2这2个库。
使用命令很简单：CHANGE REPLICATION FILTER REPLICATE_DO_DB = (db1, db2);
mysql> CHANGE REPLICATION FILTER REPLICATE_DO_DB = (db1, db2); ERROR 3017 (HY000): This operation cannot be performed with a running slave sql thread; run STOP SLAVE SQL_THREAD first mysql>
可以看见提示要先停止SQL线程。那就先停止SQL线程。
mysql> STOP SLAVE SQL_THREAD; Query OK, 0 rows affected (0.01 sec) mysql> CHANGE REPLICATION FILTER REPLICATE_DO_DB = (db1, db2); Query OK, 0 rows affected (0.00 sec)
成功执行，我们再看看复制状态：
mysql> show slave status\G *************************** 1. row *************************** Slave_IO_State: Waiting for master to send event Master_Host: 10.69.25.173 Master_User: repl Master_Port: 3306 Connect_Retry: 60 Master_Log_File: mysql-bin.000001 Read_Master_Log_Pos: 1902 Relay_Log_File: relaylog.000002 Relay_Log_Pos: 2068 Relay_Master_Log_File: mysql-bin.000001 Slave_IO_Running: Yes Slave_SQL_Running: No Replicate_Do_DB: db1,db2 Replicate_Ignore_DB: Replicate_Do_Table: Replicate_Ignore_Table: Replicate_Wild_Do_Table: Replicate_Wild_Ignore_Table: Last_Errno: 0
可以看见已经成功设置只同步db1，db2库，设置完成开启SQL线程就完事。
那么我们要是又要全部的库都要同步该如何操作呢，也很简单。
mysql> STOP SLAVE SQL_THREAD; Query OK, 0 rows affected (0.00 sec) mysql> CHANGE REPLICATION FILTER REPLICATE_DO_DB = (); Query OK, 0 rows affected (0.00 sec) mysql> start SLAVE SQL_THREAD; Query OK, 0 rows affected (0.00 sec) mysql> show slave status\G *************************** 1. row *************************** Slave_IO_State: Waiting for master to send event Master_Host: 10.69.25.173 Master_User: repl Master_Port: 3306 Connect_Retry: 60 Master_Log_File: mysql-bin.000001 Read_Master_Log_Pos: 1902 Relay_Log_File: relaylog.000002 Relay_Log_Pos: 2068 Relay_Master_Log_File: mysql-bin.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:
可以看见又没有过滤了。又全部同步所有的库了。重点命令就是
CHANGE REPLICATION FILTER REPLICATE_DO_DB = ();
我们同样可以可以设置只同步某个库下面的某张表，或者不同步某个库下面的某张表。看命令。
mysql> STOP SLAVE SQL_THREAD; Query OK, 0 rows affected (0.00 sec) mysql> CHANGE REPLICATION FILTER -> REPLICATE_WILD_DO_TABLE = ('db1.t1%'), -> REPLICATE_WILD_IGNORE_TABLE = ('db1.t2%'); Query OK, 0 rows affected (0.00 sec) mysql> show slave status\G *************************** 1. row *************************** Slave_IO_State: Waiting for master to send event Master_Host: 10.69.25.173 Master_User: repl Master_Port: 3306 Connect_Retry: 60 Master_Log_File: mysql-bin.000001 Read_Master_Log_Pos: 1902 Relay_Log_File: relaylog.000002 Relay_Log_Pos: 2068 Relay_Master_Log_File: mysql-bin.000001 Slave_IO_Running: Yes Slave_SQL_Running: No Replicate_Do_DB: Replicate_Ignore_DB: Replicate_Do_Table: Replicate_Ignore_Table: Replicate_Wild_Do_Table: db1.t1% Replicate_Wild_Ignore_Table: db1.t2%
可以看见我已经设置同步db1下面以t1开头的表。忽略了db1下面t2开头的表。
重点的命令就是：
CHANGE REPLICATION FILTER REPLICATE_WILD_DO_TABLE = ('db1.t1%'), REPLICATE_WILD_IGNORE_TABLE = ('db1.t2%');
如果我们要设置同时同步1个库下面的某些表可以这样写：
mysql> STOP SLAVE SQL_THREAD; Query OK, 0 rows affected (0.00 sec) mysql> CHANGE REPLICATION FILTER -> REPLICATE_WILD_DO_TABLE = ('db2.t1%','db2.t2%'); Query OK, 0 rows affected (0.00 sec) mysql> show slave status\G *************************** 1. row *************************** Slave_IO_State: Waiting for master to send event Master_Host: 10.69.25.173 Master_User: repl Master_Port: 3306 Connect_Retry: 60 Master_Log_File: mysql-bin.000001 Read_Master_Log_Pos: 1902 Relay_Log_File: relaylog.000002 Relay_Log_Pos: 2068 Relay_Master_Log_File: mysql-bin.000001 Slave_IO_Running: Yes Slave_SQL_Running: No Replicate_Do_DB: Replicate_Ignore_DB: Replicate_Do_Table: Replicate_Ignore_Table: Replicate_Wild_Do_Table: db2.t1%,db2.t2%
可以看到已经成功设置。
如果我们这样写是不生效的。会以最后一个表为准：
mysql> STOP SLAVE SQL_THREAD; Query OK, 0 rows affected (0.00 sec) mysql> CHANGE REPLICATION FILTER -> REPLICATE_WILD_DO_TABLE = ('db2.t1%'), -> REPLICATE_WILD_DO_TABLE = ('db2.t2%'); Query OK, 0 rows affected (0.00 sec) mysql> show slave status\G *************************** 1. row *************************** Slave_IO_State: Waiting for master to send event Master_Host: 10.69.25.173 Master_User: repl Master_Port: 3306 Connect_Retry: 60 Master_Log_File: mysql-bin.000001 Read_Master_Log_Pos: 1902 Relay_Log_File: relaylog.000002 Relay_Log_Pos: 2068 Relay_Master_Log_File: mysql-bin.000001 Slave_IO_Running: Yes Slave_SQL_Running: No Replicate_Do_DB: Replicate_Ignore_DB: Replicate_Do_Table: Replicate_Ignore_Table: Replicate_Wild_Do_Table: db2.t2%
可以看到只有db2下面的t2开头的表生效了。
参考资料：
https://www.percona.com/blog/2015/11/04/mysql-5-7-change-replication-filter-online/
