Github user hongyuhong commented on the issue: https://github.com/apache/flink/pull/4324 Hi @fhueske, sorry for the late feedback. The refactoring looks pretty great to me, i think it's good to be merged. The only thing i worry about is that there is no enough message for the user to figure out the exact error, do we have plan to improve this? Thanks very much. Yuhong
--- If your project is set up for it, you can reply to this email and have your reply appear on GitHub as well. If your project does not have this feature enabled and wishes so, or if the feature is enabled but not working, please contact infrastructure at infrastruct...@apache.org or file a JIRA ticket with INFRA. ---