文档介绍：南京邮电大学
硕士学位论文
数据网格中副本管理策略研究
姓名:施晓烨
申请学位级别:硕士
专业:计算机软件与理论
指导教师:王汝传
2011-03
南京邮电大学硕士研究生学位论文中文摘要
中文摘要
信息爆炸带来了对数据存储及访问速度的空前要求,存储规模越来越大,管理也越来
越复杂,同时对存储的可扩展及可靠性也带来了更高的挑战。为了解决这些问题,数据网
格应运而生。数据网格正是一个以数据为主要资源的网格系统,它将网络上海量的、分散
的、独立的、异构的储存系统组织成一个可靠、安全的逻辑意义上的整体,进行统一的管
理,从而为用户提供透明的、高效的、高可靠的服务。
数据网格中的副本技术是必不可少的。副本技术主要包括:副本创建、副本选择、副
本定位以及副本一致性维护。其中,副本创建的优劣将直接影响到网格的系统性能,因此
必须结合环境特点在合适的节点上建立副本;在副本创建之后,则需要副本的选择和定位
机制来获取最优副本;同时由于网格的动态性,副本一致性维护也是副本管理中的重要组
成部分,因为这直接影响到副本管理的性能和正确性。
本文针对数据网格中副本的关键技术,做了以下几方面的研究:首先,改进了传统的
副本创建算法,提出了改进的最佳副本创建算法;其次,提出了适合当前环境的副本定位
及一致性维护方法以及给出了基于副本访问代价的副本选择算法;最后,实现了副本管理
系统。

关键词:数据网格,副本创建,副本选择,副本定位,副本一致性维护
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南京邮电大学硕士研究生学位论文 ABSTRACT
ABSTRACT
The information explosion has brought about an unprecedented demand in the speed of data
storing and accessing. The storage scale is growing soaring larger, and management is ing
plex as well, all of these have caused greater challenges to the storage
scalability and reliability. To solve all these difficulties, the data grid es into
being at this time. The data grid is a major resource based data-grid system anizes the
huge, decentralized, independent, heterogeneous storage system from the into a reliable,
secure integration of logical meaning, and manages them unified, aiming at providing the users
with transparent, efficient, highly reliable service.
The replica technology of data grid is essential, such as: replica creation, replica selection,
replica location, replica consistency maintenance. Firstly, among them, the quality of replica
creation will directly affect the system performance of information grid, so a good foundation
must be laid according to the characteristics of environment to create replica at the appropriate
nodes. After the replica creation, it’s necessary to use the technology of replica selection and
replica location to find the best replica. At the same time, replica consistency maintenance is also
a copy of an important pa