purge_logs was called with file xxx not listed in the index处理及分析

mysql告警日志alert.log里面每个小时都有以下报错：

141203 11:45:22 [ERROR] MYSQL_BIN_LOG::purge_logs was called with file /u01/my3431/log/mysql-bin.000001 not listed in the index.

$ll mysql-bin.*

-rw-rw---- 1 mysql dba     26073 Dec 10  2013 mysql-bin.000001

-rw-rw---- 1 mysql dba    912964 Dec 10  2013 mysql-bin.000002

-rw-rw---- 1 mysql dba      9157 Dec 10  2013 mysql-bin.000003

-rw-rw---- 1 mysql dba 524288336 Feb 21  2014 mysql-bin.000004

-rw-rw---- 1 mysql dba 524288056 Apr 15  2014 mysql-bin.000005

-rw-rw---- 1 mysql dba 524288085 Jul 21 18:17 mysql-bin.000006

-rw-rw---- 1 mysql dba 524288047 Oct 27 06:43 mysql-bin.000007

-rw-rw---- 1 mysql dba 200600175 Dec  3 13:56 mysql-bin.000008

-rw-rw---- 1 mysql dba       264 Oct 27 06:43 mysql-bin.index

$sudo cat mysql-bin.index

/u01/mybase/log/mysql-bin.000001 // 路径错误，应该是/u01/my3431/log/

/u01/mybase/log/mysql-bin.000002 // 路劲错误，应该是/u01/my3431/log/

/u01/mybase/log/mysql-bin.000003                // 路劲错误，应该是/u01/my3431/log/

/u01/my3431/log/mysql-bin.000004

/u01/my3431/log/mysql-bin.000005

/u01/my3431/log/mysql-bin.000006

/u01/my3431/log/mysql-bin.000007

/u01/my3431/log/mysql-bin.000008

应该已经看出问题了。binlog的索引文件里面，前3个文件的路径是错误的，purge的时候，和/u01/my3431/log/mysql-bin.000001这个目录对应不上，故清理失败报错。

解决方法：
修改mysql-bin.index文件中的错误路径；需要注意的是，这里需要sudo到mysql账号，如果用个人账号或者root，vim后保存，
将导致mysql账号没有权限。
# 修改后如下：
cat mysql-bin.index
/u01/my3431/log/mysql-bin.000001
/u01/my3431/log/mysql-bin.000002
/u01/my3431/log/mysql-bin.000003
/u01/my3431/log/mysql-bin.000004
/u01/my3431/log/mysql-bin.000005
/u01/my3431/log/mysql-bin.000006
/u01/my3431/log/mysql-bin.000007
/u01/my3431/log/mysql-bin.000008

# 登陆mysql，执行flush logs；

为啥要flush logs，留个思考题，哈哈。