def __refresh(self):
        try:
            if self.url != None:
                du_dict = CoordinationAdaptor.get_du(self.url)
                data_unit_dict_list = eval(du_dict["data_unit_items"])
                self.data_unit_items = [DataUnitItem.create_data_unit_from_dict(i) for i in data_unit_dict_list]
        except:
            logger.warn("Refresh of DU %s failed"%(self.get_url()))
Update list of data units items 
dataset/ETHPy150Open saga-project/BigJob/pilot/impl/pilotdata_manager.py/DataUnit.__refresh