关键词: Web服务, 容错, 冗余策略, 成本, 服务性能

Abstract: Replication strategy-based fault tolerance approaches for Web services have been widely used to guarantee the reliability and performance of service-oriented critical systems. Current approaches pay the major attention on performance-related qualities such as response time and failure rate. However, they ignore cost-related qualities such as the cost of service invocation and compensation, i.e., lack the consideration on cost-benefit analysis. This paper proposes a strategy-planning approach for Web service fault tolerance supporting cost-benefit analysis. The approach first defines the cost prediction formulas for the 9 common replication strategies based on the cost of service invocation and compensation, and then designs a strategy selection algorithm supporting cost-benefit analysis. The experimental results demonstrate that the proposed approach can significantly improve the effectiveness of the fault tolerance strategy with acceptable overhead.

Key words: Web service, fault tolerance, replication strategy, cost, service performance