Current state: Accepted (2.4.0)
Discussion thread: link
Please keep the discussion on the mailing list rather than commenting on the wiki (wiki discussions get unwieldy fast).
We've observed that many usage of the `consumer.committed` calls are not only for a single partition, but for a batch of partitions. On the other hand, the OffsetFetchRequest protocol actually allows for multiple partitions within one request.
So it's a natural proposal to extend our existing `consumer#committed` function to take a set of topic-partitions.
We propose to add two overloaded function of `consumer#committed` that takes a set of topic-partitions, and deprecate the existing two functions that only take one topic-partition. At the moment the latter would be implemented as passing in a singleton set to the newly added functions.
As above. Internal implementations are straight-forward and would not be discussed here.
Compatibility, Deprecation, and Migration Plan
- There is no direct impact on users since we only add new overloaded functions while deprecating the old ones.
- When we eventually remove the deprecated functions users need to change their code to call the new functions with singleton set.