CAREER: Ensuring Sustainable Scalability for Globally-Distributed Systems

在过去的几年里，见证了越来越多的大规模网络系统。这些系统中的大多数都是按照覆盖方法构建的，每个系统都定期独立地探测其环境，以指导路径选择算法，绕过故障链路并复制内容以获得可用性。随着这些系统的普及，这种方法将导致监控的不可持续程度，并限制分布式服务的种类、数量和跨度。本项目的主题是，通过战略性地重用CDNS和P2P系统等长期运行的、无处不在的服务收集的网络视图，可以构建一大部分全球分布式系统，以确保可持续的可伸缩性。这项工作定义和探索了“3R”--一种设计和实现分布式系统的新方法，它专注于通过战略性地重用环境的视图和回收先前收集的度量来最小化聚合控制和管理开销。特别是，我们正在设计有效的技术来维护、访问和重用这些信息，以构建下一代流多播、内容分发和数据共享应用程序。该工作探索了环境测量回收/重用方面的权衡，以及它们在分布式系统设计中的应用。最终，它将促进广域应用的部署，造福整个社会。研究议程辅之以一项全面的教育和外联计划，以加强实验系统教育，并有助于招聘和留住人才。

The past few years have witnessed a growing number of large-scalenetworked systems. Most of these systems are built following anoverlay approach, with each of them regularly and independentlyprobing its environment to guide path selection algorithms, routearound faulty links and replicate content for availability. As thesesystems grow in popularity, such an approach will result in anunsustainable degree of monitoring and restrict the variety, numberand span of distributed services.The thesis of this project is that a large fraction ofglobally-distributed systems can be built to ensure sustainablescalability by strategically reusing the view of the network gatheredby long-running, ubiquitous services such as CDNs and P2Psystems. This work defines and explores "3R" - a new approach to thedesign and implementation of distributed systems that focuses onminimizing aggregated control and administrative overhead bystrategically reusing environment's views and recycling previouslygathered measurements. In particular, we are designing efficienttechniques for maintaining, accessing and reusing this information forbuilding next-generation streaming multicast, content distribution anddata sharing applications.The work explores the tradeoffs in the recycling/reuse ofenvironmental measurements, and their implication indistributed-system design. Ultimately, it will facilitate deploymentsof wide-area applications, benefiting society at large. The researchagenda is complemented by a thorough education and outreach plan forstrengthening experimental systems education and contributing tominority recruitment and retention.