code: def create_rendezvous_handler(driver):
      class ElasticRendezvousHandler(RendezvousHandler):
          def _get_value(self, scope, key):
              if scope == GET_RANK_AND_SIZE:
                  host, local_rank = key.split(":")
                  return self._get_rank_and_size(host, int(local_rank))
  
              return super(RendezvousHandler, self)._get_value(
                  scope, key
              )
  
          def _get_rank_and_size(self, host, local_rank):
              logging.info(
                  "_get_rank_and_size: {} {}".format(host, local_rank)
              )
              driver.record_ready(host, local_rank)
              slot_info = driver.get_slot_info(host, local_rank)
              logging.info(
                  "rank and size: {} {}".format(
                      slot_info.rank, slot_info.size
                  )
              )
              return slot_info.to_response_string().encode("ascii")
  
          def _put_value(self, scope, key, value):
              if scope == PUT_WORKER_ADDRESSES:
                  host, local_rank = key.split(":")
                  addresses, secret_key = codec.loads_base64(value)
                  self._put_worker_addresses(
                      host, int(local_rank), addresses, secret_key
                  )
  
              super(RendezvousHandler, self)._put_value(
                  scope, key, value
              )
  
          def _put_worker_addresses(
              self, host, local_rank, addresses, secret_key
          ):
              driver.register_worker_server(
                  host, local_rank, addresses, secret_key
              )
  
      return ElasticRendezvousHandler
  
label_desc: Use image node_id 1 for calling a global function with example usage: create_rendezvous_handler(driver) and returns: ElasticRendezvousHandler, super, slot_info, self