一种有效负载均衡的网格Web服务体系结构模型

An Effective Loading-Balancing Framework for Grid Web Service

基于Web服务资源的小世界模型,提出了一种可无缝结合网格 OGSA框架的 Web服务体系结构与动态的资源负载均衡分配模型,它以 Web服务资源注册中心(Web Services Resource Register Center,WSRRC)作为Web服务资源查找的入口,以Web服务资源 ID类形成的虚拟资源树作为资源逻辑组织与负载均衡分配结构,以小世界形成的区域代理自治系统(Area Proxy Autonomy System, APAS)来进行 Web服务资源的维护.并详细描述了该模型的实现机制、组织协议与数据结构,着重研究了逻辑资源树负载信息的传播机制及负载均衡策略,模拟试验表明该模型是合理而有效的:它可以在较小开销下获得较满意的资源组织与定位性能,能适应网格 Web服务资源的异构、复杂与动态性,具有良好的可扩展性及保持全局网络负载均衡的良好性能.

Based on the small world model of web service resources, a web service architecture, which is seamlessly integrated with OGSA (Open Grid Service Architecture), and a resource distribution model considering dynamic load balancing are proposed. It regards WSRRC (web services resource register center) as an entry for web service resource searching, take the virtual resource tree, which is based on the web resource identification types, as resource logic organization and resource distribution construction, and maintains web service resources according to the APAS (area proxy autonomy system) derived from the small world. Meanwhile, the implementing mechanism, the organizing protocol and the data structures required are also given, with the emphasis on the discussion of the information transmitting mechanism of the logic resource tree and the strategy for load balancing. The analysis of the model and the simulations carried on the prototype demonstrate that the model is sound and efficient, is able to achieve satisfactory performance on resource organizing and locating at a small cost, and is well adapted to the heterogeneous, complicated and dynamic features of the web service resources, with good scalability achieved and global load balancing gained.