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Survey of DHT topology construction techniques in virtual computing environments

Science china(Information Sciences) 2011年第11期54卷 2221-2235页

作者： zhang yiming 1,2,lu xicheng 1,2 & li dongsheng 1,21 national laboratory for parallel and distributed processing (PDL),changsha 410073,china 2 School of Computer,national University of Defense Technology,changsha 410073,china 1. national laboratory for parallel and distributed processing (PDL) Changsha 410073 China2. School of Computer National University of Defense Technology Changsha 410073 China

The Internet-based virtual computing environment (iVCE) is a novel network computing *** characteristics of growth,autonomy,and diversity of Internet resources present great challenges to resource sharing in *** DHT overlay (DHT for short) technique has various advantages such as high scalability,low latency,and desirable availability,and is thus an important approach to realizing efficient resource *** construction is a key technique for structured overlays that realizes basic overlay functions including dynamic maintenance and message *** this paper,we first introduce the traditional techniques of DHT topology construction,focusing mainly on dynamic maintenance and message routing of typical DHTs,DHT indexing techniques for complex queries,and DHT grouping techniques for matching domain *** then present recent advances in DHT topology construction techniques in iVCE taking advantage of the characteristics of Internet ***,we discuss the future of DHT topology construction techniques.

关键词： virtual computing environments DHT overlays topology construction distributed indexing flexible routing

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Embedded DHT overlays in virtual computing environments

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Science china(Information Sciences) 2010年第3期53卷 483-493页

作者： zhang yiming, lu xicheng & li dongsheng 1national laboratory for parallel and distributed processing (PDL), changsha 410073, china 2School of Computer, national University of Defense Technology, changsha 410073, china 1. national laboratory for parallel and distributed processing (PDL) Changsha 410073 China

With the rapid development of computing and networking technologies, people propose to build harmonious, trusted and transparent Internet-based virtual computing environments (iVCE). The overlay-based organization of dynamic Internet resources is an important approach for iVCE to realizing efficient resource sharing. DHT-based overlays are scalable, low-latency and highly available; however, the current DHT overlay (SKY) in iVCE cannot satisfy the "trust" requirements of Internet applications. To address this problem, in this paper we modify SKY and propose TrustedSKY, an embedded DHT overlay technique in iVCE which supports applications to select trusted nodes to form a "trusted subgroup" in the base overlay and realize secure and trusted DHT routing.

关键词： Internet-based virtual computing environment (iVCE) DHT overlay TrustedSKY

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SCautz:a high performance and fault-tolerant datacenter network for modular datacenters

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Science china(Information Sciences) 2012年第7期55卷 1493-1508页

作者： HUANG Feng,lu xicheng,li dongsheng & zhang yiming national Lab for parallel and distributed processing,School of Computer,national University of Defense Technology,changsha 410073,china 1. national Lab for parallel and distributed processing School of Computer National University of Defense Technology Changsha 410073 China

Modular datacenters (MDCs) use shipping containers,encapsulating thousands of servers,as large pluggable building blocks for mega *** MDC’s "service-free" model poses stricter demand on fault-tolerance of the modular datacenter network (MDCN).Based on the "scale-out" principle,in this paper we propose SCautz,a novel hybrid intra-container network for *** comprises a base Kautz topology,created by interconnecting servers,and a small number of COTS (commercial off-the-shelf) ***,each switch connects a specific number of servers forming "clusters",which,as logical nodes,form multiple higher-level logical Kautz ***’s hybrid structure has several ***,it supports multiple running modes for the MDC,while its full structure increases network capacity ***,it retains the throughput for processing one-to-x traffic in the presence of ***,it achieves much more graceful network performance degradation than computation and storage capacity *** from theoretical analysis and simulations show that SCautz is more viable for intra-container networks.

关键词： modular datacenter network container Kautz fault-tolerant

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SKY:Efficient peer-to-peer networks based on distributed Kautz graphs

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Science in china(Series F) 2009年第4期52卷 588-601页

作者： zhang yiming lu xicheng li dongsheng national laboratory for parallel and distributed processing National University of Defense Technology Changsha 410073 China

Many proposed P2P networks are based on traditional interconnection topologies. Given a static topology, the maintenance mechanism for node join/departure is critical to designing an efficient P2P network. Kautz graphs have many good properties such as constant degree, low congestion and optimal diameter. Due to the complexity in topology maintenance, however, to date there have been no effective P2P networks that are proposed based on Kautz graphs with base ~ 2. To address this problem, this paper presents the ＂distributed Kautz （D-Kautz） graphs＂, which adapt Kautz graphs to the characteristics of P2P networks. Using the D-Kautz graphs we further propose SKY, the first effective P2P network based on Kautz graphs with arbitrary base. The effectiveness of SKY is demonstrated through analysis and simulations.

关键词： peer-to-peer network Kautz graph constant degree topology maintenance D-Kautz graph

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