ITR/SY Collaborative Research: A Unified Relational Approach to Grid Information Services

运行在分布式计算环境（如计算网格）中的应用程序必须适应可用的硬件和软件资源。这需要有关网格资源属性的信息，如主机、网络交换机、链接和路径、软件库和系统、用户和组织权限、软件服务、事件通道和字典等。 应用程序运行所需的信息、信息的值（信息变化的速度）和信息的新鲜度（必须以多快的速度将更新推送到应用程序）可能会有很大的不同。这些属性对资源信息服务提出了重要的要求，这些要求也随着目录服务的一般领域的日益普及而出现。网格论坛是一个全球网格计算的国际标准组织，它正在开发表示和查询这些信息的标准。这些不断发展的标准有很多优点，但也有许多形式的非常理想的查询，在这些系统中执行起来很困难或代价很高。特别是，动态信息将需要非常高的更新率不支持基于LDAP的implementation.This项目将解决这些问题，通过建议（暂命名为）网格资源信息服务（GRIS），一个统一的关系网格信息服务的方法。该研究将从关系数据库系统的完整ACID（原子性/一致性/隔离性/持久性）功能开始，并“构建”到一个实用的资源信息系统，该系统仍然提供RDBMS的大部分优点。 这样的系统将为所有类型的网格资源信息（无论多么动态）提供单一的高度灵活的查询模型和语言。 这项研究将最终在一个可扩展的实现基础上的商品数据库系统和SQL语言，包括“罐头查询”的非SQL用户。该项目将评估新的系统和技术使用记录更新和查询现有的网格信息服务，并比较结果与层次系统，如Globus MDS 2。为了便于比较，该项目将通过与用户、工具开发人员和网格论坛成员的讨论产生一组基准查询，并将量化这些查询的限制。

An application running in a distributed computing environment such as the Computational Grid must adapt to the available hardware and software resources. This requires information about the properties of Grid resources such as hosts, network switches, links and paths, software libraries and systems, user and organization rights, software services, event channels and dictionaries, and more. The information needed for an application to run, the values of the information (how fast the information changes) and the freshness of the information (how fast updates must be pushed to the application) can vary dramatically. These attributes place significant demands on the resource information service, demands that are arising with increasing prevalence in the general area of directory services as well. The Grid Forum, an international standards body for world-wide Grid computing, is developing standards for representing and querying this information. There is much that is excellent about these evolving standards, but there are many forms of highly desirable queries that will be difficult or expensive to perform in these systems. In particular, dynamic information will require very high update rates not supported by LDAP-based implementations.This project will address these concerns through a proposed (and tentatively named) Grid Resource Information Service (GRIS), a unified relational approach to grid information services. The research will start with the full ACID (Atomicity/Consistency/Isolation/Durability) functionality of a relational database system and "build down" to a practical resource information system that still provides most of the benefits of the RDBMS. Such a system will provide a single highly flexible query model and language for all types of Grid resource information, no matter how dynamic. The research will culminate in an extensible implementation based on commodity database systems and the SQL language, including "canned queries" for non-SQL users. The project will evaluate the new system and techniques using logged updates and queries from an existing Grid information service, and comparing results with a hierarchical system such as Globus MDS2. To facilitate comparisons, the project will produce a set of benchmark queries from discussions with users, tool developers, and Grid Forum members, and will quantify the limits of these queries.