III:Small:Transactional Data Stores in the Cloud

云计算已经成为在大型计算基础设施中托管Internet规模应用程序的强大范例，因为云计算具有无限资源和无限可伸缩性、无需预先投资的按使用付费模型、资源弹性和容错性等理想特性。由于云的主要目标之一是托管数据密集型应用程序，因此大规模数据管理是一个关键组件。传统的关系数据库非常成功，但缺乏云设置中所需的可伸缩性、弹性、容错和自我管理特性。这导致了一种称为键值存储模型的新存储模型的出现。尽管键-值存储具有所需的特性，但由于它们的单键访问保证，它们提供的一致性和功能都很少，从而给应用程序开发人员带来了前所未有的负担。该项目探索了云中的两种可伸缩数据存储设计——ElasTraS：针对需要关系存储模型的企业应用程序的弹性事务数据存储；G-Store：一种事务性多键值存储，目标应用程序支持键-值存储的数据模型，但需要在单键之外进行一致和可扩展的访问。该项目为设计和实现可扩展的数据管理系统提供了许多新颖的研究解决方案，并作为开发处理日益增长的互联网规模的商品解决方案的构建块。该项目使研究生和本科生都能在大型分布式系统的软件和解决方案的设计和开发方面得到培训。该项目的URL可在：http://www.cs.ucsb.edu/~dsl/?q=cloud-transactions。

Cloud computing has emerged as a powerful paradigm for hosting Internet scale applications in large computing infrastructures due to their desirable features of unlimited resources and infinite scalability, pay-per-use model requiring no up-front investment, elasticity of resources, and fault-tolerance. Since one of the primary goals of the cloud is to host data-intensive applications, large-scale data management is a crucial component. Traditional relational databases have been extremely successful but lack scalability, elasticity, fault-tolerance, and self-management features that are required in cloud settings. This has led to the emergence of a new storage model referred to as the key-value store model. Although key-value stores have the desired features, they provide minimal consistency and reduced functionality due to their single-key access guarantees thus placing unprecedented burden on application developers. This project explores two alternative scalable data stores designs in the cloud -- ElasTraS: an elastic transactional data store targeted towards enterprise applications requiring a relational storage model; and G-Store: a transactional multi-key value store targeted for applications which favor the data model of key-value stores, but require consistent and scalable access beyond single keys. This project brings forth many novel research solutions for designing and implementing scalable data management systems, and acts as a building block for developing commodity solutions dealing with the growing scale of the Internet. The project enables both graduate and undergraduate students to be trained in the design and development of software and solutions for large-scale distributed systems. The project URL is available at: http://www.cs.ucsb.edu/~dsl/?q=cloud-transactions.