An epidemic model gives an efficient approach for transaction processing of replication systems in weakly connected environments. The approach has the advantages of high adaptation, support for low-bandwidth network, and committing updates in an entirely decentralized control fashion. But the previous implementing protocols, like ROWA protocol, quorum protocol, and voting protocol, have a common shortcoming that they are pessimistic in conflict reconciliation, therefore bring high transaction abort rate and reduce system performance dramatically when the workload scales up. In this paper, an optimistic voting protocol, which introducescondition vote andorder vote in the voting process of transactions, is proposed. Thecondition vote andorder vote postpone the final decision on conflicting transactions and avoid transaction aborts that are incurred by read-write and write-write conflicts. Experimental results indicate that the optimistic voting protocol decreases abort rate and improves average response time of transactions markedly when compared to other protocols.
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This research is supported by the National Natural Science Foundation of China (Grant No. 69773018).
LIN Huaizhong was born in 1970. He received the B.S. degree from Department of Mathematics, Fudan University in 1991, and the M.E. degree from Department of Computer Science and Engineering, Shanghai Jiaotong University in 1994. Now he is a Ph.D. candidate in Department of Computer Science and Engineering, Zhejiang University. His research interests include mobile computing and distributed database.
CHEN Chun was born in 1955. Now he is a professor and Ph.D. supervisor in the Department of Computer Science and Engineering. Zhejiang University. His research interests include software engineering, computer graphics, CAD/CAM, artificial Intelligence, and mobile computing.
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Lin, H., Chen, C. Optimistic voting for managing replicated data. J. Compt. Sci. & Technol. 17, 874–881 (2002). https://doi.org/10.1007/BF02960779
- weakly connected environment
- data replication
- epidemic model
- optimistic voting