code: def execute_on_all_members(self, task):
          
          return self.execute_on_members(self._client.cluster.get_member_list(), task)
docs: Executes a task on all of the known cluster members.
  
          :param task: (Task), the task executed on the all of the members.
          :return: (Map), :class:`~hazelcast.future.Future` tuples representing pending completion of the task on each member.