...

There's no impact on existing users as we only add new method. End users who leverages `poll(0)` are encouraged to migrate to the new method with proper timeout (and retry), as it provides expected behavior with avoiding infinite hang.

Rejected Alternatives

Add overloaded version of `poll(Duration, Duration)` to provide timeout for both updating assignment metadata and pulling records

While this method helps to achieve similar effect on `poll(0)`, this still doesn't guarantee the desired behavior - no records will be polled. As end users only interest with assignment metadata when they call `pull(0)`, it would be better to provide a method which guarantee such behavior.