Analysis of P2P file transferring system by stochastic queue models

Peer-to-peer (P2P);Queue model;File transferring;one club;stability

Zhu, Ji ; Hajek ; Bruce

关键词: Peer-to-peer (P2P);    Queue model;    File transferring;    one club;    stability;   

Others  :  https://www.ideals.illinois.edu/bitstream/handle/2142/16485/Zhu_Ji.pdf?sequence=2&isAllowed=y

美国|英语

来源: The Illinois Digital Environment for Access to Learning and Scholarship

【 摘 要 】

Distributed protocols for peer-to-peer (P2P) file sharing over the Internethave beenhighly successful in recent years.The idea is that files to be shared are broken into pieces. As newpeers enter the system, they strive to obtain a complete collection fromother peers and from a seed. In this thesis we focus on studying a P2P file transferring network by a stochastic queue model. After presenting a general stochasticmodel, we discuss three cases obtained by specializing the general model usingthree different choices of parameter values and selection strategies. In the first case, we deal with a simple model under a fixed peer selection strategy, and identify a problem that might occur when the rate of distribution of pieces is not large enough. The similar problem exists when we consider the second and the third cases where the uniform random peer selection strategy is applied. The problem is that, when the distribution of pieces from either the seed or external arrivals is not large enough, the system will work poorly. There may be symmetry breaking --- with one piece becoming very rare --- that makes the system unstable.