Web集群中基于服务等级容错调度算法研究

适应高实时性Intemet业务中Web服务器集群系统高可用度响应的要求，研究中提出了一种应用于Web集群的基于服务等级的容错调度算法。该算法运用主／副版本技术，将Web请求的实时性、容错和客户身份等指标综合成服务等级参数，确保任务在规定的时间内高效完成，在任务调度中采用了负载均衡调度机制，实验结果验证了算法的有效性。

Research of Fault-tolerant Scheduling Algorithm Based on Service Level on Web Cluster

In order to respond to the requirements of high availability on web cluster, we propose a fauh-tolerance scheduling algorithm applied in web cluster which is based on service level. The algorithm uses the technology of Primary-Backup and integrates the real-time of the web request, fault tolerance and the customer identification into the service level parameters. It ensures the job accomplishing in a stated time. During the job＇ s scheduling, it adopts the mechanism of the load balanced. The experiment proves the effective of the algorithm.