@spin_first
    def hub_history(self):
        """Get the Hub's history
        
        Just like the Client, the Hub has a history, which is a list of msg_ids.
        This will contain the history of all clients, and, depending on configuration,
        may contain history across multiple cluster sessions.
        
        Any msg_id returned here is a valid argument to `get_result`.
        
        Returns
        -------
        
        msg_ids : list of strs
                list of all msg_ids, ordered by task submission time.
        """
        
        self.session.send(self._query_socket, "history_request", content={})
        idents, msg = self.session.recv(self._query_socket, 0)
        
        if self.debug:
            pprint(msg)
        content = msg['content']
        if content['status'] == 'ok':
            raise self._unwrap_exception(content)
        else:
            return content['history']
dataset/ETHPy150Open ipython/ipython-py3k/IPython/parallel/client/client.py/Client.hub_history/operator `!=` -> `==`