title: Handle Rebalancing of consumer group on addition of consumer
body: <p>I want to know how can we handle consumer group re-balancing in case of a new consumer being added to the group. As it automatically rebalances the partition assignment , the existing consumer running when try to process the batch and commit the offset fails. </p>
  
  <p>Handing rebalancing or knowing when the rebalancing is occurring i can ignore the data processing and commit offset job and ask the consumer to poll the message again from committed offset.</p>