计算机科学 ›› 2015, Vol. 42 ›› Issue (7): 156-161.doi: 10.11896/j.issn.1002-137X.2015.07.034
冯 翔 杨 昙 李 松
FENG Xiang YANG Tan LI Song
摘要： 撒谎行为的存在会破坏CDN缓存分配的公平性。 使用博弈论对服务器在缓存分配过程中的自私撒谎行为进行了研究。经分析发现,服务器撒谎行为的本质就是当缓存不足时,额外多申请一定量缓存；而当缓存充足时,则诚实地申请所需缓存量。针对这种撒谎行为,提出了一种公平分配算法,在计算服务器的缓存申请量时,考虑其历史缓存申请量,并根据不同阶段申请量的有效性不同引入年龄因子,(重新)计算得到服务器的当前有效缓存申请量,使得撒谎的服务器与诚实的服务器相比受到更多损失,以此来促使其停止撒谎行为。同时,公平算法还保证了系统的最大吞吐量,并引入了价格机制来保证诚实的服务器得到更高的需求满足度。仿真实验结果表明,公平算法对于上述撒谎行为有很好的改善效果。
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