mysql> start slave;
ERROR 1872 (HY000): Slave failed to initialize relay log info structure from the repository

 

处理一则MySQL Slave环境出现ERROR 1201 (HY000): Could not initialize master info structure的案例。
冷备份方式复制一份新的slave，初始化参数中已经修改了相关文件路径及server_id等关联参数。
但在启动slave时发现error_log中出现下列错误信息：
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120326 11:10:23 [ERROR] /usr/local/mysql//libexec/mysqld: File '/data/mysqldata/3306/binlog/mysql-relay-bin.000002' not found (Errcode: 2)
120326 11:10:23 [ERROR] Failed to open log (file '/data/mysqldata/3306/binlog/mysql-relay-bin.000002', errno 2)
120326 11:10:23 [ERROR] Failed to open the relay log '/data/mysqldata/3306/binlog/mysql-relay-bin.000002' (relay_log_pos 126074557)
120326 11:10:23 [ERROR] Could not open log file
120326 11:10:23 [ERROR] Failed to initialize the master info structure
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由于新的slave改变了服务端口和文件路径，分析应该是由于mysql-relay-bin.index中仍然保存着旧relay日志文件的路径，而这些路径下又找不到合适的文件，因此报错。
对于这类问题解决起来是比较简单的，重置slave的参照即可，执行命令如下：
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mysql> reset slave;
Query OK, 0 rows affected (0.01 sec)
 
mysql> change master to 
    -> master_host='10.0.0.101',
    -> master_port=3306,
    -> master_user='repl',
    -> master_password='repl',
    -> master_log_file='mysql-bin.000011',
    -> master_log_pos=1;
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ERROR 29 (HY000): File '/data/mysqldata/3306/binlog/mysql-relay-bin.000001' not found (Errcode: 2)
看来应该还是mysql-relay-bin.index的问题，删除该文件及关联的relay-bin文件。再次配置master：
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mysql> change master to 
    -> master_host='10.0.0.101',
    -> master_port=3306,
    -> master_user='repl',
    -> master_password='repl',
    -> master_log_file='mysql-bin.000011',
    -> master_log_pos=1;
ERROR 1201 (HY000): Could not initialize master info structure; more error messages can be found in the MySQL error log
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出现了新的错误，按照提示查看error_log也没发现更多错误信息,error_log中只是显示一条：
120326 11:14:27 [ERROR] Error reading master configuration
在操作系统端查看master/slave的配置文件，发现是两个0字节文件：
-rw-rw---- 1 mysql mysql     0 Mar 26 11:13 master.info
-rw-rw---- 1 mysql mysql     0 Mar 26 11:13 relay-log.info

 

会不会是这个原因呢，直接删除这两个文件，然后尝试重新执行change master：
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mysql> change master to 
    -> master_host='10.0.0.101',
    -> master_port=3306,
    -> master_user='repl',
    -> master_password='repl',
    -> master_log_file='mysql-bin.000011',
    -> master_log_pos=1;
Query OK, 0 rows affected (0.00 sec)
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成功，启动slave并查看状态：
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mysql> start slave;
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: 10.0.0.101
                  Master_User: repl
                  Master_Port: 3306
                Connect_Retry: 60
              Master_Log_File: mysql-bin.000011
          Read_Master_Log_Pos: 101
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...........
故障解决。

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