Collapsar

update fastjson to 1.2.83 directly refer: https://github.com/actiontech/dble/discussions/3002 how does dble turn on fastjson safeMode? add configuration in wrapper.cnf or bootstrap.cnf > wrapper.java.additional.13=-Dfastjson.parser.safeMode=true refer:https://github.com/alibaba/fastjson/wiki/fastjson_safemode

refer zk acl：https://www.cnblogs.com/zhjh256/p/11679639.html

I think it can work, if it can't work, you can try customized route fuction, please refer：https://github.com/actiontech/dble-docs-cn/blob/master/1.config_file/1.09_dble_route_function_spec.md

Use like this？ 

加session和不加session的语义是不一样的，具体可以参考：https://dev.mysql.com/doc/refman/8.0/en/set-transaction.html 在分布式的场景下，不加session的场景对于dble来说不易处理，因此，dble对不加session的场景是禁止的。

doc : https://dev.mysql.com/doc/refman/8.0/en/enum.html If dble supports it, need higher cost. So dble doesn't support it temporarily.

need detail, eg: create table statement and jdbc code

refer: https://dev.mysql.com/doc/internals/en/com-query-response.html#fnref_internal MySQL bug: https://bugs.mysql.com/bug.php?id=87534 solution: 1. update mysql to 5.7.22 or higher 2. modify sql, replace union all

please refer：https://opensource.actionsky.com/20201204-mysql/

> 大佬，dble内部有没有类似于keepalive的功能啊，如果改系统级影响就比较大了。 we will fix this issue next version.