title: __consumer_offsets topic growing huge
body: <p>Is there any way we can track cleanup on the consumer_offsets topic? I m trying to find where the throttle is.</p>
  <p>The problem is consumer_offsets topic right now is over 400 GB. It happens quite frequently and we had to adjust the log.cleaner.threads between 2 - 4 to kick the compaction. We have been doing this once every week to reduce the size of the consumer_offsets topic. We are using Kafka 1.1 version.</p>
  <p>I m trying to find where the throttle is, if its capacity issue or if the log cleaner thread is being blocked by something. Any tools to debug this problem?</p>
  <p>Can someone shed light on this? Thank you!</p>