昨天同事在做主从时，从库报如下错误：

Got fatal error 1236 from master when reading data from binary log: 'Misconfigured master - server id was not set'?

备库采集：
root@localhost Fri May 23 14:18:59 2014 14:18:59 [(none)]> show variables like '%server_id%';
+---------------+-------+
| Variable_name | Value |
+---------------+-------+
| server_id     | 2     | 
+---------------+-------+

主库采集：

mysql> show variables like '%server%';
+----------------------+-------------------+
| Variable_name        | Value             |
+----------------------+-------------------+
| character_set_server | latin1            |
| collation_server     | latin1_swedish_ci |
| server_id            | 1                 |
+----------------------+-------------------+

由于业务是用于存储hadoop的元数据，之前MySQL版本较低，同事用了比master版本高的slave，本以为是这个原因，但在MySQL 的bug列表上发现：

该发现否定了我们之前的判断，经过同事那边的测试，也确实是这个bug :-)