title: What happens when a new consumer is added to a running consumer group?
body: <p>Suppose a kafka topic with 3 partitions is getting consumed by a consumer group of 3 consumers. In a cloud environment if a new consumer scales up and now there are 4 consumers in that group. What happens in this situation?</p>
  
  <ul>
  <li>Does Kafka create another partition so that the new consumer can access it  </li>
  </ul>
  
  <p>OR</p>
  
  <ul>
  <li>Does the new consumer sit idle and does not consume anything ? </li>
  </ul>