空间信息网格中的复制技术  

Replication in Spatial Information Grid

作　　者：罗滔[1] 方涛[1] 

机构地区：[1]上海交通大学图像处理与模式识别研究所,上海200030

出　　处：《计算机科学》2004年第8期77-79,共3页Computer Science

基　　金：研究得到国家863项目(No.2002 AA 134020-05)的资助。

摘　　要：分布性是空间信息网格的重要特点之一。组成网格的高性能、计算能力的不同计算机及各类数据库等各种设备和资源分布在不同的地理位置,跨越的地理范围较广。为了让用户更快更好地获得所需的空间信息,采用动态复制技术,把数据文件复制到用户最容易访问的服务器或数据库。把相同的复本放在地理位置不同的站点,能够减少数据访问的响应时间,增强分布式运算的健壮性。本文将依据 Globus 中的复制体系架构,根据空间信息网格在城市空间信息共享服务与在线分析处理中应用的具体特点,在分析各种复制策略优缺点的基础上,从城市空间信息应用服务的实际特点出发,提出我们的动态复制策略与技术。Distribution is one of the most important characteristics of spatial information grid. Various settings and resource such as computers, which are high-powered and have different computational abilities, as well as different databases, the electronic libraries and so on, constitute Grid. They distribute in different geographical locations and spread widely. To satisfy the user's need and to make them get what they need fast and reliably, we use dynamic replication technology to replicate files to some server or database that can be accessed easily by users. Identical repli- cas of data are generated and stored at various globally distributed sites. Replication can reduce data access latency and increase the performance and robustness of distributed applications. According to replication infrastructure, which is used by Globus, and the characteristics of spatial information grid, which is usecl in the city spatial information ser- vice sharing and on-line analysis, we brought forward our dynamic replication policy and technology. They are exalted from the analysis of different replication policies, and found on the practical characters of city spatial information ap- plication service.

关 键 词：分布性 空间信息网格 复制技术 动态复制策略 复制目录 

分 类 号：TP391.4[自动化与计算机技术—计算机应用技术]