code: def forward(self, request: Request):
          
          key = request.key
          num_replicas = self.replicas.num_replicas
          logger.debug('{} forwarding request {} to {} replicas'
                       .format(self, key, num_replicas))
          self.replicas.pass_message(ReqKey(key))
          self.monitor.requestUnOrdered(key)
          self.requests.mark_as_forwarded(request, num_replicas)
docs: Forward the specified client REQUEST to the other replicas on this node
  
          :param request: the REQUEST to propagate