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2009
IEEE

Robust Lifetime Measurement in Large-Scale P2P Systems with Non-Stationary Arrivals

9 years 9 months ago
Robust Lifetime Measurement in Large-Scale P2P Systems with Non-Stationary Arrivals
—Characterizing user churn has become an important topic in studying P2P networks, both in theoretical analysis and system design. Recent work [26] has shown that direct sampling of user lifetimes may lead to certain bias (arising from missed peers and round-off inconsistencies) and proposed a technique that estimates lifetimes based on sampled residuals. In this paper, however, we show that under non-stationary arrivals, which are often present in real systems, residual-based sampling does not correctly reconstruct user lifetimes and suffers a varying degree of bias, which in some cases makes estimation completely impossible. We overcome this problem using two contributions: a novel non-stationary ON/OFF churn model and an unbiased randomized residual sampling technique for measuring user lifetimes. The former allows correlation between ON/OFF periods of the same user and exhibits different join rates during the day. The latter spreads sampling points uniformly during the day and us...
Xiaoming Wang, Zhongmei Yao, Yueping Zhang, Dmitri
Added 21 May 2010
Updated 21 May 2010
Type Conference
Year 2009
Where P2P
Authors Xiaoming Wang, Zhongmei Yao, Yueping Zhang, Dmitri Loguinov
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