数据网格中高效的元数据管理策略

High-effect metadata management strategy on data grid

在数据网格中,提出了采用完全分布方式、基于智能Cache和语义的元数据管理策略,在管理策略中设计一个元数据管理系统的体系结构SMICC。该体系结构引入了智能Cache和语义信息的方式来对元数据系统进行管理,减少远程访问时间和增加查询的准确度。SMICC可以利用智能Cache和语义信息处理不同的情况,可以根据本地可用的元数据进行查询的分解形成子查询,用户可以从本地Cache中获得元数据查询结果的一部分,剩下的部分可以从远程位置获得。通过语义信息和已有元数据,不仅可以使系统达到更好的扩展性和可用性,而且在保证用户访问质量的同时也提高了访问效率。

A strategy is proposed in data grid, which adopts the completely distributed structure based on intelligent cache and sefiaantic method. By the strategy, a architecture called SMICC （semantic metadata intelligent cache controller） is designed. It adopts,an intelligent cache and semantic method to control the metadata system. According to semantic information and local cache, SMICC can deal with different scenarios like splitting and merging of queries into sub-queries for available metadata sets in local, in order to reduce access time of remote queries and increase precision of query. User can fred partial results from local cache and the remaining portion of the metadata that can be fetched from remote locations. Using semantic information and the existed metadata, it can not only enhance the fault tolerance and load balancing of system effectively, but also improve the efficiency of access while ensuring the access quality.