Github user jrthe42 commented on the issue:
https://github.com/apache/flink/pull/6301
Hi @hequn8128, I agree with you that a connection pool is more effective
using connection resource. I didn't choose connection pool because that will
introduce new dependencies, and I'm not sure if that tradeoff is acceptable. I
will check ```MiniConnectionPoolManager ``` to see if it's a better way.---
