title: Consumer offset topics corrupted on one leader in kafka cluster
body: <p>We have a 6 node kafka cluster and one node 4 we are facing issue with consumer offset topic ex:</p>
  
  <p>[root@kafka012-broker-shared-server2 kafka_2.11-1.1.1]# bin/kafka-topics.sh --describe --zookeeper localhost:2181 --topic __consumer_offsets | grep -w "Leader: 4"</p>
  
  <pre><code>    Topic: __consumer_offsets       Partition: 0    Leader: 4       Replicas: 1,3,5 Isr: 4
  
      Topic: __consumer_offsets       Partition: 4    Leader: 4       Replicas: 5,1,3 Isr: 4
  
      Topic: __consumer_offsets       Partition: 10   Leader: 4       Replicas: 5,1,6,2,3     Isr: 4
  
      Topic: __consumer_offsets       Partition: 12   Leader: 4       Replicas: 1,3,5,2       Isr: 4
  
      Topic: __consumer_offsets       Partition: 16   Leader: 4       Replicas: 5,1,3,6       Isr: 4
  </code></pre>
  
  <p>even these partitions folder are unavailable on /var/broker/data path.  Kafka cluster is created on aws and uses EBS volumes. We have tried reassigning partitions to other nodes in cluster however it says assignment already done.</p>
  
  <p>We are noticing following error :
  Group coordinator kafka012-broker-shared-server2:9094 (id: 2147483643 rack: null) is unavailable or invalid, will attempt rediscovery – vamsi krishna 2 hours ago   Delete</p>