【作者】 王剑；

【导师】 张建军；

【作者基本信息】 西北大学 ， 计算机应用技术， 2007， 硕士

【摘要】 数据网格是一种网格计算系统，主要用来处理数据——有约束的共享和管理大量的分布式数据。数据网格技术是研究的热点，主要集中在元数据管理和复制管理两个方面。校园网络环境中存在大量的信息孤岛，许多资源和信息不能得到有效的利用和共享。本文通过对数据网格中元数据管理和复制管理技术的分析研究，设计了校园数据网格系统来解决校园网络环境中的问题。主要从以下几个方面进行了研究：1．元数据管理的分析研究：本文分析了当前元数据管理模型的特点，并在此基础上提出了一种局部自治的、分布式的、三层结构的元数据管理模型。2．副本的创建策略分析研究：本文分析了现有的副本创建策略，并提出了适用于校园数据网格系统的缓存加最佳用户副本创建策略。在局部自治域之间采用缓存副本创建策略，在局部自治域内采用最佳用户策略。3．副本的定位与选择机制分析研究：本文分析了副本定位与选择的各种机制，选取了适用于校园数据网格系统的机制。副本的定位采用副本目录来实现，副本目录中记录逻辑文件到物理文件的映射信息，来完成副本定位。副本的选择采用简单、高效的IBL算法来实现。4．副本的一致性管理分析研究：本文分析了现有的副本一致性策略，提出了适用于本文提出的元信息管理模型的副本一致性策略。在研究数据网格关键技术的基础上，结合本文的研究成果设计了校园数据网格系统，并给出了系统初步的原型实现。更多还原

【Abstract】 A data grid is a grid computing system that deals with data—the controlled sharing and management of large amounts of distributed data. Technology of Data Grid is a research hot. Metadata and replica management are crucial aspect. There are great deals of information isolated island, many resources and information can’t get valid utilization and share in the campus network environment.To investigate on technology of metadata and replica management in Data Grid, designs Campus Data Grid to resolve the problem within environment of the campus network. This paper carries on a research from several followings:1. Metadata management: To analyze features of some related model of metadata management. On the basis of research a kind of local autonomy, distributed and three layers model of metadata management is suggested.2. Replica creation strategy: To analyze some related works on the replica creation strategy. Caching plus best client replica creation strategy for Campus Data Grid environment is suggested. Between of local autonomy adopts caching strategy. Inside of local autonomy adopts best client strategy.3. Replica location and selection mechanism: To analyze some related works on the replica location and selection mechanism. Mechanism for Campus Data Grid environment is selected. Replica catalog is used to implement replica location. Replica catalog storage mapping of logical file to physical file that implements the location. Replica selection adopts simple and efficient IBL algorithm.4. Replica consistency management: To analyze some related replica consistency management strategy. Replica consistency management strategy for metadata model of this paper is suggested.On basis of investigating on key technology of Data Grid, this paper designs Campus Data Grid system with production of research and realizes primary system model.更多还原