By Nikos E. Mastorakis
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Rollback recovery is a process of resuming/recovering a computation from a consistent global checkpoint. The messages generated by the underlying computation are referred to as computation messages or simply messages and are denoted by mi or m. The processes are denoted by Pi. The ith CI of a process denotes all the computation performed between its ith and (i+1)th checkpoint, including the ith checkpoint but not the (i+1)th checkpoint. A process Pi directly depends upon Pj only if there exist m such that: (i) Pi has processed m sent by Pj (ii) Pi has not taken any permanent checkpoint after processing m (iii) Pj has not 30 Sunil Kumar Gupta, R.
All snapshots cannot be taken at precisely the same instant because of synchronization problems. Furthermore, the photographers should not disturb the process that is being photographed. Yet, the composite picture should be meaningful. The problem before us is to define meaningful and then to determine how the photographs should be taken . The problem of taking a checkpoint in a message passing distributed system is quite complex because any arbitrary set of checkpoints cannot be used for recovery , , .
Juang, “Low Overhead optimistic crash Recovery”, Proc. 11 Int. Conf. Distributed Computing systems, pp. 454-461, 1991. , Ohnishi, T. , “Mobile Computing Environment based on internet packet forwarding”, Winter Usenix, Jan. 1993.  Wang Y. Y. , “Checkpointing and its Applications,” Proceedings of the 25th International Symposium on Fault-Tolerant Computing (FTCS-25), pp. 22-31, June 1995. , “A Decentralized Recovery Control Protocol”, IEEE Symposium on Fault Tolerant Computing, 1981.  Bin Yao, Kuo-Feng Ssu and W.