Has anyone else seen issues with producer performance in 0.9.0? I updated a few of our jobs recently and ended up rolling one back to 0.8 since it was being really sluggish. I profiled it for a bit and a lot of time was being spent in BufferPool.allocate and the busy-loop in KafkaSystemProducer's flush. The flush-ms metric said that flushes were taking on the order of tens of seconds.
The slow topic was a state changelog for a stream-stream join buffer. I tried setting producer.linger.ms to 1, 5, and 1000, but that didn't change the behavior much. Gian
