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中文摘要：
对等网络应用是目前互联网上最主要的应用之一，但是它的性能受到抖动特性——节点频繁加入和退出网络的影响．文章在系统简述抖动的由来、定义及其对P2P系统性能影响的基础上，详细介绍抖动的统计特性研究，发现如节点的会话时长一般服从重尾分布等的一些动态规律；详述抖动的测量方法研究，针对被动监测，主动监测以及抽样测量等阐述各自的优缺点，并说明相应的改进方法来提高网络测量的精度；详述为减少抖动影响的应对策略研究，在邻居选择、失效恢复、副本维护、连接生命周期维护等方面说明各应对策略的功能和优缺点，并针对各个方面分别阐述自己的看法．最后对未来的研究趋势进行了总结和展望．
英文摘要：
P2P application is one of the most popular applications in the Internet, but its per- formance is badly influenced by the churn character-the nodes continuous arrival and departure. On the basis of introducing the origin of the churn, the definition of it and its influences to the P2P system performance, we minutely describe the research on the statistical properties, and dis- cover some dynamic law including nodes＇ session time generally obey the heavy-tailed distribu- tion. Then we detail the measurement methods. For passive monitoring, active monitoring, sample and so on, we present the advantages and disadvantages of each method, and explain the corresponding improving method to enhance the accuracy of the measurement. After that we elaborate the resilience strategies to the churn. Towards the neighbor selection, failure recovery, replica maintenance, link lifetime maintenance and so on, we present also the advantage and disadvantage of each strategy, and present our view to each of aspects. Finally, the summary and prospect of the future research are given.
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