开源PolarDB-X|proxy连接超时
使用PolarDB-X集中式时，使用ProxySQL代理。springboot项目，使用druid连接池。
安装版本如下：
ProxySQL version 2.4.8-2-g2cc900a, codename Truls
PolarDB-X version 2.4.1（PolarDB-X-engine-8.4.19-20241112.el7.x86_64）
项目直连polardb-x主节点正常，但是连接ProxySQL时，提示超时，报错如下：
Cause: com.mysql.cj.jdbc.exceptions.CommunicationsException: Communications link failure
The last packet successfully received from the server was 59,999 milliseconds ago. The last packet sent successfully to the server was 60,001 milliseconds ago.
; Communications link failure
The last packet successfully received from the server was 59,999 milliseconds ago. The last packet sent successfully to the server was 60,001 milliseconds ago.; nested exception is com.mysql.cj.jdbc.exceptions.CommunicationsException: Communications link failure
The last packet successfully received from the server was 59,999 milliseconds ago. The last packet sent successfully to the server was 60,001 milliseconds ago.
at org.springframework.jdbc.support.SQLExceptionSubclassTranslator.doTranslate(SQLExceptionSubclassTranslator.java:100)
at org.springframework.jdbc.support.AbstractFallbackSQLExceptionTranslator.translate(AbstractFallbackSQLExceptionTranslator.java:70)
at org.springframework.jdbc.support.AbstractFallbackSQLExceptionTranslator.translate(AbstractFallbackSQLExceptionTranslator.java:79)
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PolarDB 分布式版 (PolarDB for Xscale，简称“PolarDB-X”) 采用 Shared-nothing 与存储计算分离架构，支持水平扩展、分布式事务、混合负载等能力，100%兼容MySQL。 2021年开源，开源历程及更多信息访问：OpenPolarDB.com/about
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