title: Kafka Failover and Replica
body: <p>Let's assume I have a Kafka Cluster of 3 brokers and 3 zookeeper. </p>
  
  <p>I have a single topic <code>accountsTopic</code> which is setup as <code>replication factor of 3</code> and <code>ISR of 2</code>. </p>
  
  <p>If the <code>Leader</code> dies, kafka will elect the <code>ISR</code> as leader, but the 3rd one, (which say for arguments sake was not ISR), is it going to serve as a ISR of current leader in this 2 node fail-over setup?</p>