RESEARCH INITIATION AWARD: Design and Performance Characterization of a Multipurpose Decentralized Group Membership Service

9309316 Shukla这个项目的重点是组成员服务的结构，这是面向组的分布式应用程序的基本构件。该项目的目标是开发具有多种服务类别的会员服务并确定其性能特征。重点是服务类别的分类定义以支持广泛的应用，自适应状态监视以最小化错误感知的状态变化，完全分散和分层的协议需要与所提供的服务质量成正比的开销，以及尽管存在瞬时网络划分，但仍支持一系列成员资格语义。将开发技术，通过利用本地通信环境的属性和使用基于拓扑的优化来支持在一组不同的网络上无缝分布大群组。将使用形式化技术来描述和验证协议的实现。将开发一个性能度量来表征成员协议的性能。性能将通过基于应用程序、成员协议和底层网络的随机建模的模拟来研究。模拟将使用商业网络工程工具构建。这项研究的主要贡献是一个单一的、多用途的成员协议，而不是目前缺乏的特定于应用的多样性和量化的性能表征。***

9309316 Shukla This project focuses on the structure of a group membership service, a basic building block for group-oriented distributed applications. The objectives of this project are development and performance characterization of a membership service with multiple classes of service. The emphasis is on categorical definition of service classes to support a wide spectrum of applications, adaptive status monitoring to minimize wrongly perceived status changes, a completely decentralized and hierarchical protocol requiring an overhead proportional to the quality of the service rendered, and support of a spectrum of membership semantics in spite of transient network partitioning. Techniques will be developed to support seamless distribution of large groups across a set of heterogeneous networks by exploiting the attributes of local communication environments and using topology-based optimizations. Formal techniques will be used for specification and verification implementation of the protocol. A performance metric will be developed for characterization of the performance of membership protocols. Performance will be studied with simulations based on stochastic modeling of applications, membership protocols, and underlying networks. The simulations will be built using commercial network engineering tools. The main contributions expected from this research are a single multipurpose membership protocol instead of the current application- specific variety and quantitative performance characterization which is currently lacking. ***