Abstract
An efficient roll-forward checkpointing/recovery scheme for distributed systems has been presented. This work is an improvement of our earlier work. The use of the concept of forced checkpoints helps to design a single phase non-blocking algorithm to find consistent global checkpoints. It offers the main advantages of both the synchronous and the asynchronous approaches, that is simple recovery and simple way to create checkpoints. The algorithm produces reduced number of checkpoints. Since each process independently takes its decision whether to take a forced checkpoint or not, it makes the algorithm simple, fast and efficient. The proposed work offers better performance than some noted existing works. Besides, the advantages stated above also ensure that the algorithm can work efficiently in mobile computing environment.
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