III:Small:Transactional Data Stores in the Cloud

云计算以其无限的资源和无限的可扩展性、不需要前期投资的按次付费模式、资源的弹性和容错性等特点，已经成为在大型计算基础设施中托管互联网规模应用的强大范例。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，但缺乏云环境所需的可扩展性、灵活性、容错性和自我管理功能。这导致了一种被称为键值存储模型的新存储模式的出现。尽管键值存储具有所需的功能，但由于其单键访问保证，它们提供的一致性最低且功能减少，从而给应用程序开发人员带来了前所未有的负担。该项目探索了两种可在云中替代的可伸缩数据存储设计--ElasTraS：面向需要关系存储模型的企业应用程序的弹性事务性数据存储；以及G-Store：面向支持键值存储的数据模型，但需要单键以外的一致和可伸缩访问的应用程序的事务性多键价值存储。该项目为设计和实现可扩展的数据管理系统带来了许多新颖的研究解决方案，并为开发处理不断增长的互联网规模的商用解决方案提供了基础。该项目使研究生和本科生都能接受大规模分布式系统软件和解决方案的设计和开发方面的培训。项目网址为：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.