计算机应用 ›› 2011, Vol. 31 ›› Issue (11): 3068-3071.DOI: 10.3724/SP.J.1087.2011.03068

• 数据库技术 • 上一篇    下一篇

PPStream点播系统主动测量方法与用户特性分析

郝正鸿,陈兴蜀,王海舟,胡鑫   

  1. 四川大学 计算机学院,成都 610064
  • 收稿日期:2011-05-09 修回日期:2011-06-30 发布日期:2011-11-16 出版日期:2011-11-01
  • 通讯作者: 郝正鸿
  • 作者简介:郝正鸿(1986-),女,黑龙江牡丹江人,硕士研究生,主要研究方向:信息安全、P2P网络;陈兴蜀(1968-),女,四川自贡人,教授,博士生导师,博士,主要研究方向:信息安全、计算机网络;王海舟(1986-),男,四川南充人,博士研究生,主要研究方向:信息安全、P2P网络;胡鑫(1988-),男,四川岳池人,硕士研究生,主要研究方向:信息安全、P2P网络。
  • 基金资助:
    国家973计划项目;国家242信息安全计划项目;国家“核高基”重大专项

Active measurement of PPStream VOD system and client behavior analysis

HAO Zheng-hong,CHEN Xing-shu,WANG Hai-zhou,HU Xin   

  1. College of Computer Science, Sichuan University, Chengdu Sichuan 610064, China
  • Received:2011-05-09 Revised:2011-06-30 Online:2011-11-16 Published:2011-11-01
  • Contact: HAO Zheng-hong

摘要: 采用被动测量技术分析了PPStream点播系统的节点发现和分发协议,研究了视频缓冲图(Buffer-Map)的结构特点和主要功能,在此基础上设计并实现了一款用于获取PPStream点播节目用户Buffer-Map信息的分布式主动测量爬虫系统,使用该爬虫对PPStream点播系统的用户观看行为进行了分类统计,首次提出了用户观看粘度的概念并做量化统计分析,发现用户观看粘度与平均观看长度成正比,与累计概率曲线斜率成反比。

关键词: 对等网, PPStream点播系统, 主动测量, 视频缓冲图, 用户行为分析

Abstract: The analysis results on PPStream-VOD System client behavior characteristics were presented in this paper. This study began from researching on peer-distributing protocol and the architecture of Buffer-Map based on passive measurement. A dedicated PPS-VOD crawler was deployed to capture clients’ Buffer-Map and study the characteristics of client watching behavior. By accurate data analysis, the client behavior was classified as Long-Smoother, Short-Smoother and Jumper. Then the proportion of three kinds of clients and their different watching behaviors were proposed. The concept watching viscosity was put forward to reveal the attraction of program to users, which is in direct proportion to average watching time, and in inverse proportion to slope of probabillty accumulation curve.

Key words: Peer-to-Peer (P2P) network, PPStream-VOD system, active measurement, Buffer-Map, client behavior analysis

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