关键词: 随机Petri网, Java虚拟机, Java服务, 高可用, 软件老化与再生

Abstract: Java service has become real-world critical business service, and its availability is the key to the availability of business system based on Java technology. The availability of Java services can be improved when the technology of active fault-tolerance is applied. The model of active fault-tolerance facilitates the activities of analysis and evaluation. The effect of fault tolerance between with-Rejuvenation and without-Rejuvenation was discussed through model analysis and emulation experiments. The conclusion is the availability of Java services can be improved if the active fault-tolerant technology was adopted. If a reasonable time point of using software Rejuvenation strategy is chosen, the better fault tolerance effect will be achieved.

Key words: Stochastic Petri Net (SPN), Java Virtual Machine (JVM), Java service, High Availability (HA), Software Ageing and Rejuvenation (SAR)