我从 AWS Glue 开始，想要通过 JDBC 连接到我的本地 mysql 服务器。
我按照文档创建粘合 IAM 角色、策略、安全组并使用正确的 jdbc 连接字符串进行连接。但是当我测试连接时，我收到以下 CloudWatch 记录：
"Check that your connection definition references your JDBC database with
correct URL syntax, username, and password. Communications link failure
The last packet sent successfully to the server was 0 milliseconds ago. The
driver has not received any packets from the server.
Exiting with error code 30"
我很确定 jdbc 连接字符串是正确的。
Glue 配置中的某些内容一定丢失或错误。