The 2.0 feature list includes the removal of Flink's Time classes in favor of the JDKs java.time.Duration class. There was already a discussion about it in [1] and FLINK-14068 [2] was created as a consequence of this discussion.
I started working on marking the APIs as deprecated in FLINK-32570 [3] where Chesnay raised a fair point that there isn't a FLIP, yet, to formalize this public API change. Therefore, I went ahead and created FLIP-335 [4] to have this change properly documented. I'm not 100% sure whether there are better ways of checking whether we're covering everything Public API-related. There are even classes which I think might be user-facing but are not labeled accordingly (e.g. flink-cep). But I don't have the proper knowledge in these parts of the code. Therefore, I would propose marking these methods as deprecated, anyway, to be on the safe side. I'm open to any suggestions on improving the Test Plan of this change. I'm looking forward to feedback on this FLIP. Best, Matthias [1] https://lists.apache.org/thread/76yywnwf3lk8qn4dby0vz7yoqx7f7pkj [2] https://issues.apache.org/jira/browse/FLINK-14068 [3] https://issues.apache.org/jira/browse/FLINK-32570 [4] https://cwiki.apache.org/confluence/display/FLINK/FLIP-335%3A+Removing+Flink%27s+Time+classes
