论文部分内容阅读
可靠的服务质量是数据网格应用的关键因素之一.服务质量感知的副本放置问题在传统模型中加入个体服务质量约束,可满足QoS严格的数据网格应用需求.针对现有副本放置算法不支持多属性约束、可扩展性不高等缺点,提出一种基于矩阵操作加速的3阶段副本放置算法TP-GABMAC算法,并引入副本环处理副本更新和一致性维护问题.分析和实验表明,TP-GABMAC算法具有稳定性好和可扩展性强的特点,在多种网络拓扑、访问模式和负载条件下均能获得合理的副本策略.
Reliable quality of service is one of the key factors in the application of data grid.A problem of replica placement for service quality perception is to include individual quality of service constraints in the traditional model to meet the QoS requirements of data grid applications.Aiming at the existing algorithm of replica placement TP-GABMAC algorithm is proposed based on matrix operation to accelerate the three-phase copy placement algorithm, and a replica ring is introduced to deal with the issue of updating and consistency maintenance.Analysis and experiments show that the TP- GABMAC algorithm has the characteristics of good stability and scalability, and can obtain a reasonable copy strategy under a variety of network topology, access mode and load conditions.