ITR: System Support for Automatic and Consistent Replication of Internet Services

ITR：互联网服务自动一致复制的系统支持

• 批准号: 0082912
• 负责人: Amin Vahdat
• 金额: $ 36.2万
• 依托单位: Duke University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2000
• 资助国家: 美国
• 起止时间: 2000-09-01 至 2004-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0082912&HistoricalAwards=false
• 关键词: ITR; System; Support; Automatic; Consistent

This project explores two complementary techniques for addressingfundamental limitations in replicating network services. The first aspectof this proposal seeks to automatically replicate service programs andstate information to allow transparent caching or replication of dynamicservices. The goal of the research is to allow transparent caching orreplication of dynamic services, a key step toward automatically convertingunscalable service implementations into scalable ones. The second thrust ofthis work is to allow network services to dynamically trade replicaconsistency for increased system availability and performance. The TACT(Tunable Availability and Consistency Tradeoffs) toolkit allows Internetservices to flexibly and dynamically choose their ownavailability/consistency tradeoffs. We use three consistency metrics,Numerical Error, Order Error and Staleness to capture application-specificconsistency requirements of Internet services. Applications use thesemetrics in addition to application-specific parameters to assign a numericvalue to system consistency, e.g., the percentage of user requests thatmust eventually be rolled back because of underlying replicainconsistency. Finally, TACT allows consistency to be specified on aper-user, client, and replica basis, enabling differentiated quality ofservice.

该项目探索了两种互补技术来解决复制网络服务的基本限制。该提案的第一方面旨在自动复制服务程序和状态信息，以允许动态服务的透明缓存或复制。该研究的目标是允许动态服务的透明缓存或复制，这是自动将不可扩展的服务实现转换为可扩展的服务实现的关键一步。这项工作的第二个目标是允许网络服务动态地交换副本一致性以提高系统可用性和性能。 TACT（可调可用性和一致性权衡）工具包允许互联网服务灵活、动态地选择自己的可用性/一致性权衡。我们使用三个一致性指标：数字错误、顺序错误和陈旧性来捕获特定于应用程序的互联网服务一致性要求。 除了应用程序特定的参数之外，应用程序还使用这些指标来为系统一致性分配一个数值，例如，由于底层副本不一致而最终必须回滚的用户请求的百分比。 最后，TACT 允许在每个用户、客户端和副本的基础上指定一致性，从而实现差异化的服务质量。