Though a few previous research efforts have investigated the peer availability of P2P systems, the understanding of peer dynamic is far from adequate. Based on the running log of a file-sharing P2P system, it produced a more thorough measurement of the dynamic natures of P2P system. This paper further shows that due to the methodology limitation, crawler based measurement can not precisely capture system dynamic natures as a whole. This paper also emphasizes some simple yet important dynamic metrics, which are omitted or neglected by previous studies because of state of the art in durability analysis at that time. By a fine-grained analysis on the preliminary findings, it reveal a series of useful implications for the design of P2P systems.
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