title: kafka MirrorMaker 2.0 does not replicate data
body: <p>I am trying to replicate Kafka cluster with MirrorMaker 2.0.
  I am using following mm2.properties:</p>
  
  <pre><code># mm2.properties
  clusters=source, dest
  
  source.bootstrap.servers=kafka-1:9092,kafka-2:19092,kafka-3:29092
  dest.bootstrap.servers=kafka-4:39092,kafka-5:49092,kafka-6:59092
  
  source-&gt;dest.enabled=true
  </code></pre>
  
  <p>I can see that when MirrorMaker starts, it creates its own topics. For example on source cluster it creates: <strong>mm2-configs.dest.internal</strong> with following content:</p>
  
  <pre><code>{
     "properties":{
        "connector.class":"org.apache.kafka.connect.mirror.MirrorSourceConnector",
        "source.cluster.producer.bootstrap.servers":"kafka-4:39092,kafka-5:49092,kafka-6:59092",
        "source.cluster.alias":"dest",
        "source.cluster.bootstrap.servers":"kafka-4:39092,kafka-5:49092,kafka-6:59092",
        "target.cluster.producer.bootstrap.servers":"kafka-1:9092,kafka-2:19092,kafka-3:29092",
        "enabled":"false",
        "target.cluster.admin.bootstrap.servers":"kafka-1:9092,kafka-2:19092,kafka-3:29092",
        "target.cluster.alias":"source",
        "target.cluster.consumer.bootstrap.servers":"kafka-1:9092,kafka-2:19092,kafka-3:29092",
        "name":"MirrorSourceConnector",
        "target.cluster.bootstrap.servers":"kafka-1:9092,kafka-2:19092,kafka-3:29092",
        "source.cluster.admin.bootstrap.servers":"kafka-4:39092,kafka-5:49092,kafka-6:59092",
        "source.cluster.consumer.bootstrap.servers":"kafka-4:39092,kafka-5:49092,kafka-6:59092"
     }
  }
  </code></pre>
  
  <p>and at destination cluster <strong>mm2-configs.source.internal</strong> topic with following content:</p>
  
  <pre><code>{
     "properties":{
        "connector.class":"org.apache.kafka.connect.mirror.MirrorSourceConnector",
        "source.cluster.producer.bootstrap.servers":"kafka-1:9092,kafka-2:19092,kafka-3:29092",
        "source.cluster.alias":"source",
        "source.cluster.bootstrap.servers":"kafka-1:9092,kafka-2:19092,kafka-3:29092",
        "target.cluster.producer.bootstrap.servers":"kafka-4:39092,kafka-5:49092,kafka-6:59092",
        "enabled":"true",
        "target.cluster.admin.bootstrap.servers":"kafka-4:39092,kafka-5:49092,kafka-6:59092",
        "target.cluster.alias":"dest",
        "target.cluster.consumer.bootstrap.servers":"kafka-4:39092,kafka-5:49092,kafka-6:59092",
        "name":"MirrorSourceConnector",
        "target.cluster.bootstrap.servers":"kafka-4:39092,kafka-5:49092,kafka-6:59092",
        "source.cluster.admin.bootstrap.servers":"kafka-1:9092,kafka-2:19092,kafka-3:29092",
        "source.cluster.consumer.bootstrap.servers":"kafka-1:9092,kafka-2:19092,kafka-3:29092"
     }
  }
  </code></pre>
  
  <p>But when I am trying to send messages to source cluster (kafka-1,kafka-2,kafka-3) - nothing copied to the second cluster.</p>
  
  <p>What do I miss?</p>
  
  <p>Appreciate any help
  Thx,</p>