Hi devs, I'd like to initiate discussion around KIP-505, exposing new public method to only update assignment metadata in consumer.
`poll(0)` has been misused as according to Kafka doc it doesn't guarantee that it doesn't pull any records, and new method `poll(Duration)` doesn't have same semantic, so would like to propose new public API which only does the desired behavior. KIP page: https://cwiki.apache.org/confluence/x/z5NiBw Please feel free to suggest any improvements on proposal, as I'm new to Kafka community and may not catch preferences (like TimeoutException vs boolean, etc.) on Kafka project. Thanks in advance! Jungtaek Lim (HeartSaVioR)
