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 while(true) {  
  List<MessageAndMetadata> messages = consumer.poll(timeout);
  process(messages);
  if(rewind_required) {
     List<PartitionOffset> partitionOffsets = new …ArrayList<PartitionOffset>();
     partitionOffsets.add(new PartitionOffset(topic, partition, offset));
     rewind_offsets(partitionOffsets);     
  }  
}