code: def get_mapping_client(self, max_concurrency=64, auto_batch=None):
          
          if auto_batch is None:
              auto_batch = self.auto_batch
          return MappingClient(connection_pool=self.connection_pool,
                               max_concurrency=max_concurrency,
                               auto_batch=auto_batch)
docs: Returns a thread unsafe mapping client.  This client works
          similar to a redis pipeline and returns eventual result objects.
          It needs to be joined on to work properly.  Instead of using this
          directly you shold use the :meth:`map` context manager which
          automatically joins.
  
          Returns an instance of :class:`MappingClient`.