MySQL bug：server-id默认被自动置为1

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昨天同事在做主从时，从库报如下错误：

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<span style="font-family: Comic Sans MS; font-size: 18px;">Got fatal error 1236 from master when reading data from binary log: 'Misconfigured master - server id was not set'</span>

<span style="font-family:Comic Sans MS;font-size:18px;">Got fatal error 1236 from master when reading data from binary log: 'Misconfigured master - server id was not set'</span>

粗粗看好像是master的server-id没有设置，但同事做如下查询：

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<span style="font-family: Comic Sans MS; font-size: 18px;">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 |
+----------------------+-------------------+</span>

<span style="font-family:Comic Sans MS;font-size:18px;">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                 |+----------------------+-------------------+</span>

此时，复制环境的server-id确实是全局唯一的。为何报错？

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 :-)

祝周末愉快，

Good Luck！

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