title: How customer offsets are maintained in mirrored cluster in Kafka?
body: <p>Lets say I have two Kafka clusters and I am using <a href="https://cwiki.apache.org/confluence/pages/viewpage.action?pageId=27846330" rel="noreferrer">mirror maker</a> to mirror the topics from one cluster to another. I understand consumer has an embedded producer to commit offsets to <code>__consumer-offset</code> topic in Kafka cluster. I need to know what will happen if primary Kafka cluster goes down? Do we sync the <code>__consumer-offset</code> topic as well? Because secondary cluster could have different number of brokers and other settings, I think. </p>
  
  <p>Please tell how Kafka mirrored cluster takes care of consumer offset?</p>
  
  <p>Does <code>auto.offset.reset</code> setting play a role here?</p>