近期大数据相关业务的MySQL上proxysql时遇到一个问题，开源BI平台metabase，通过proxysql访问mysql后无法建立连接。直接抛如下异常：
java.lang.Exception: java.sql.SQLNonTransientConnectionException: unexpected end of stream, read 0 bytes
from 7 (socket was closed by server)
at metabase.driver.util$can_connect_with_details_QMARK_.invokeStatic(util.clj:34)
at metabase.driver.util$can_connect_with_details_QMARK_.doInvoke(util.clj:18)
proxysql的版本:
ProxySQL version 1.4.11-6-g4e44db1, codename Truls
proxysql日志中有报如下异常：
2019-07-18 10:14:16 MySQL_Session.cpp:95:kill_query_thread(): [WARNING] KILL CONNECTION 0 on 10.26.1.168:3306
2019-07-18 10:14:24 MySQL_Session.cpp:2448:handler(): [ERROR] Unexpected packet from client, disconnecting the client
2019-07-18 10:14:24 MySQL_Session.cpp:2448:handler(): [ERROR] Unexpected packet from client, disconnecting the client
异常后切换到直连mysql是正常的。
在git中有类似的问题：[#1138](https://github.com/sysown/proxysql/issues/1138)。大概的问题是：
1、使用了maridb的驱动，mariadb-connector-j 2.0.0 增加了一个参数usePipelineAuth，默认是开启的。就是在发送一个请求时，没有收到回复时，就可以发送下一个请求，这时proxysql来说就是一个异常请求会断掉连接，并报如下错“[ERROR] Unexpected packet from client”。
2、切换到mysql驱动后能正常使用，mysql-connector 是没有这方面的功能的
3、使用maridb驱动需要将usePipelineAuth设置为false
知道大概方向后，向开发确认信息，确实使用maridb的驱动，不过将usePipelineAuth参数设置为false还是不行，后面将驱动换成mysql就正常了。
文章最后更新时间：
2019年07月20日 14:28:59
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