Mysql - Mysql Master error :Failed to initialize the master info structure

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今天在配置mysql replication的时候，修改完my.cnf文件，然后重启mysql service ,当执行下列命名的时候报错：

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change master to master_host='127.0.0.1',
master_user='usertest',master_password='usertest', master_log_file='mysql-bin-000002', master_log_pos=8;

ERROR 1201 (HY000): Could not initialize master info structure; more error messages can be found in the MySQL error log

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check错误日志文件 mysqld.log ,发现有如下错误：

140123 12:48:18 [ERROR] Error reading master configuration
140123 12:48:18 [ERROR] Failed to initialize the master info structure

后来检查发现在mysql数据库文件夹下面有个 空的master.info 文件（有时候还有个空的relay-log.info），问题在这里。

解决办法：
method 1 :

mysql> stop slave ;
mysql> reset salve ;
then change master
mysql> change master to master_host='127.0.0.1', master_user='usertest', master_pass  
word='usertest', master_log_file='mysql-bin-000002', master_log_pos=8;  
Query OK, 0 rows affected (0.11 sec)  

method 2 :

rm -f /var/lib/mysql/master.info
then
mysql> change master to master_host='127.0.0.1', master_user='usertest', master_pass  
word='usertest', master_log_file='mysql-bin-000002', master_log_pos=12;  
Query OK, 0 rows affected (0.11 sec)  

最后检查MySQL主从同步是否正常

mysql> start slave ;
Query OK, 0 rows affected (0.01 sec)

mysql> show slave status \G
*************************** 1. row ***************************
              Slave_IO_State: Waiting for master to send event
                 Master_Host: 127.0.0.1
                 Master_User: korea_slave
                 Master_Port: 3306
               Connect_Retry: 60
             Master_Log_File: bin-update-log.000009
         Read_Master_Log_Pos: 1551
              Relay_Log_File: mysqld-relay-bin.000002
               Relay_Log_Pos: 1702
       Relay_Master_Log_File: bin-update-log.000009
            Slave_IO_Running: Yes
           Slave_SQL_Running: Yes
             Replicate_Do_DB: tkglobal,tktest
         Replicate_Ignore_DB: local
          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: 1551
             Relay_Log_Space: 1859
             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: 1260119
1 row in set (0.00 sec)