Github user StephanEwen commented on the issue:
https://github.com/apache/flink/pull/4751
@pnowojski I am wondering whether this is really necessary. This is not
quite a busy loop after all, because the `collect()` call emits to the Kafka
Producer and goes through buffering and I/O.
Unless this is really necessary for stability, I would prefer to not do
such throttling changes. The system should be stable even with threads being
aggressively intensive.---
