Hi Alexander > I see your concerns regarding the complexity of migration, but we still > have one year to address them.
Not only the complexity of migration, but also we lack migration path for now. We have to deprecate SourceFunction/SinkFunction in 1.18 which feature freeze date is 2023/07/24 CEST If we want to remove SourceFunction/SinkFunction in 2.0, remove a public API requires at least two minor versions. There’re many subtasks to finish before we can mark them as deprecated[1], I think we have no time to finish these subtasks this week(hint: not this year). That’s why we suggested removing the SourceFunction/SinkFunction item from must to have. Best, Leonard [1]https://issues.apache.org/jira/browse/FLINK-28045
