计算机工程与应用
計算機工程與應用
계산궤공정여응용
COMPUTER ENGINEERING AND APPLICATIONS
2010年
7期
203-207
,共5页
钱碧伟%谢冬青%周再红%熊伟
錢碧偉%謝鼕青%週再紅%熊偉
전벽위%사동청%주재홍%웅위
点对点技术%视频点播%Gossip协议%分布式哈希表
點對點技術%視頻點播%Gossip協議%分佈式哈希錶
점대점기술%시빈점파%Gossip협의%분포식합희표
P2P%video on demand%Gossip protocol%Distributed Hash Table(DHT)
可扩展性和高播放连续度是视频点播系统大规模应用的关键.提出了一个分层结构的P2P点播系统,融合了Distributed Hash Table(DHT)的精确高效和Gossip协议的简单实用.该系统上层结点为下层结点提供下载服务,有效均衡负载.提出了一种数据调度策略,通过在基于Gossip协议数据可用信息交互过程中添加少量本地信息,帮助下载者选择最优下载源,提高系统播放连续度.仿真实验表明,OXVoD可以在服务器负载稳定的情况下,保证99%以上的结点正常加入系统,并获得96%以上的播放连续度.
可擴展性和高播放連續度是視頻點播繫統大規模應用的關鍵.提齣瞭一箇分層結構的P2P點播繫統,融閤瞭Distributed Hash Table(DHT)的精確高效和Gossip協議的簡單實用.該繫統上層結點為下層結點提供下載服務,有效均衡負載.提齣瞭一種數據調度策略,通過在基于Gossip協議數據可用信息交互過程中添加少量本地信息,幫助下載者選擇最優下載源,提高繫統播放連續度.倣真實驗錶明,OXVoD可以在服務器負載穩定的情況下,保證99%以上的結點正常加入繫統,併穫得96%以上的播放連續度.
가확전성화고파방련속도시시빈점파계통대규모응용적관건.제출료일개분층결구적P2P점파계통,융합료Distributed Hash Table(DHT)적정학고효화Gossip협의적간단실용.해계통상층결점위하층결점제공하재복무,유효균형부재.제출료일충수거조도책략,통과재기우Gossip협의수거가용신식교호과정중첨가소량본지신식,방조하재자선택최우하재원,제고계통파방련속도.방진실험표명,OXVoD가이재복무기부재은정적정황하,보증99%이상적결점정상가입계통,병획득96%이상적파방련속도.
Expansibility and high degree of playing continuity are key points to large-scale application of video-on-demand sys-tem.This dissertation presents a P2P video-on-demand system based on a delamination structure.h combines the accuracy and ef-ficiency of the DHT(Distributed Hash Table) with the simple practicability of the Gossip protocol.The superstratum nodes of this system offer downloading services to the substrate nodes,through which it leads to loading equilibrium.This paper also presents a data downloading strategy, it can help nodes find the optimal download resource and finally enhance the playing continuity of the system by adding a small amount of local information to the information exchange process which based on Gossip protocol.The emulation experiments show that OXVoD can ensure more than 99% of nodes joining the system normally and obtain a playing continuity more than 96% on the condition that server load is stable.