解读BitTorrent的文件不可用：测量、分析与解决方案探索
Unraveling BitTorrent's File Unavailability: Measurements, Analysis and Solution Exploration
摘要：
BitTorrent面临一个根本问题：内容的长期可用性。这种情况发生在一个月内，38%的种子在第一个月内变得不可用。在本文中，我们通过两个大规模的测量研究来探索这个问题，包括46 K的洪流和29 M的用户。这些研究大大超出了以往的任何工作，结合了每个节点，每个种子和系统范围的观察，以确定文件不可用的原因，特点和影响。该研究证实了从以前的作品，播种机的性能和可用性有显着的影响的结论。然而，我们也提出了一些重要的新发现：（i）种子的存在并不是文件可用性的唯一因素，（ii）23.5%的在无种子中运行的节点可以完成下载，（iii）BitTorrent的可用性是不连续的，在临时不可用的周期中运行。由于我们的新发现，我们认为重新审视解决方案空间是很重要的;为此，我们进行了大规模的基于轨迹的模拟，以探索两种抽象方法的潜力。
英文摘要：
BitTorrent suffers from one fundamental problem: the long-term availability of content. This occurs on a massive-scale with 38% of torrents becoming unavailable within the first month. In this paper we explore this problem by performing two large-scale measurement studies including 46K torrents and 29M users. The studies go significantly beyond any previous work by combining per-node, per-torrent and system-wide observations to ascertain the causes, characteristics and repercussions of file unavailability. The study confirms the conclusion from previous works that seeders have a significant impact on both performance and availability. However, we also present some crucial new findings: (i) the presence of seeders is not the sole factor involved in file availability, (ii) 23.5% of nodes that operate in seedless torrents can finish their downloads, and (iii) BitTorrent availability is discontinuous, operating in cycles of temporary unavailability. Due to our new findings, we consider it is important to revisit the solution space; to this end, we perform large-scale trace-based simulations to explore the potential of two abstract approaches.
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