Significant Checkpoint in Distributed System

In distributed applications, a group of multiple objects are cooperated to achieve some objectives. The objects may su er from kinds of faults. If some object o is faulty, o is rolled back to the checkpoint and objects which have received messages from o are also required to be rolled back. In this paper, on the basis of the message semantics, we de ne in uential messages whose receivers are required to be rolled back from the application point of view if the senders are rolled back. By using the in uential messages, a signi cant checkpoint is de ned to denote a consistent global state of the system while being inconsistent from the traditional de nition. We would present protocols for taking the signi cant checkpoint and for rolling back the objects.