Mysql互为主从问题--日志同步数据不同步

我搭建的是mysql 互为主从 复制

两台机器的mysql环境完全相同

第一部分测试：

B为master  A为slave的同步测试

在B上创建表lian，并插入数据
mysql> create table lian (a int,b char(10));

mysql> insert into lian (a,b)values(22,'hahah');

mysql> show tables;
+----------------+
| Tables_in_test |
+----------------+
| lian           |
+----------------+
mysql> select * from lian;
+------+-------+
| a    | b     |
+------+-------+
|   22 | hahah |
+------+-------+

查看一下master-B的binlog日志，查看以上操作是否记录了日志：
cat mysql-bin.000002                                                                                                                                                                                  
.?Nh?@
stdtestcreate table lian (a int,b char(10))??Nl>
@
stdtestinsert into lian (a,b)values(22,'hahah')

现在查看slave-A的relay日志，发现日志已经同步了
[root@XKWB5510 var]# cat XKWB5510-relay-bin.000003                                                                                                                                                     
.?Nh?@
stdtestcreate table lian (a int,b char(10))??Nl>
@
stdtestinsert into lian (a,b)values(22,'hahah')

再在slave-A上看一下数据库是不是存在lian这个表：
mysql> use test;
Database changed
mysql> show tables;
+----------------+
| Tables_in_test |
+----------------+
| aniya          |
| lian           |
+----------------+
2 rows in set (0.00 sec)

现在说明数据B A 主 从 同步成功
---------------------------------------------------------------------------
第二部分测试：

A为master  B为slave的同步测试

在A上创建表From246，并插入数据
mysql> use test;
mysql> show tables;
+----------------+
| Tables_in_test |
+----------------+
| A246         &nb