code: def load_all(self, keys=None, replace_existing_values=True):
          
          if keys:
              key_data_list = list(map(self._to_data, keys))
              return self._load_all_internal(key_data_list, replace_existing_values)
          else:
              return self._encode_invoke(map_load_all_codec, replace_existing_values=replace_existing_values)
docs: Loads all keys from the store at server side or loads the given keys if provided.
  
          :param keys: (Collection), keys of the entry values to load (optional).
          :param replace_existing_values: (bool), whether the existing values will be replaced or not with those loaded
          from the server side MapLoader (optional).