Abstract
Fault-tolerance is very important in cluster computing and has been implemented in many famous cluster-computing systems using checkpoint/restart mechanisms. But existent check-pointing algorithms cannot restore the states of a file system when roll-backing the running of a program, so there are many restrictions on file accesses in existent fault-tolerance systems. SCR algorithm, an algorithm based on atomic operation and consistent schedule, which can restore the states of file systems, is presented in this paper. In the SCR algorithm, system calls on file systems are classified into idem-potent operations and non-idem-potent operations. A non-idem-potent operation modifies a file system’s states, while an idem-potent operation does not. SCR algorithm tracks changes of the file system states. It logs each non-idem-potent operation used by user programs and the information that can restore the operation in disks. When check-pointing roll-backing the program, SCR algorithm will revert the file system states to the last checkpoint time. By using SCR algorithm, users, are allowed to use any file operation in their programs.
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