当WEB服务器负载高的时候，经常会出现这种错误，
原因：
MySQL默认connect_timeout是5秒，超过了这个时间MySQL的server端就会返回“Bad handshake”。
解决办法：
1.大多数时候设置"set global connect_timeout=60"是可以解决问题的;
我们可以通过执行“SHOW STATUS LIKE 'aborted%'”，可以观察到| Variable_name | Value |
|---|---|
| Aborted_clients | 6 |
| Aborted_connects | 15010 |
觉得是否要增加connect_timeout的时间，"Aborted_connects"将会随着服务端放弃客户端初始连接而增加。如果"Aborted_connects"很大，并且不断增加，就需要增加"connect_timeout".
2.在MySQL的配置文件中[mysqld]添加"skip-name-resolve",减少域名解析的时间
3.部署服务器端的网络要好，至少大于100Mbps/s
4.如果是在调用mysql_query的时候出现的问题，那就需要把"net_read_timeout"的时间调成30秒，或者60秒，或者更大的值
5.如果还不能解决问题，那估计是你的SQL语句中含有BLOB这种大类型，我们就需要增加"max_allowed_packet"的值了
参考资料：
http://dev.mysql.com/doc/refman/5.0/en/error-lost-connection.html
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