With the sustainable development of large distributed systems, people pay attention to the reliability of the distributed system. For example, China's Tiahe-1A, transportation system and FT-MPI system based on MPI and so on. These systems are not only related to the development of society and economy, they are also closely related to every one of us. Quality assurance as the characteristics of falut tolerance gives impetus to the wide application and importance of fault tolerance. Fault tolerance of the dis...