摘要：Existing unstructured peer-to-peer networks have low efficiency to locate the rare objects. Although various algorithms have been provided to address this problem, they do not distinguish whether the objects are rare or not and always incur unnecessary bandwidth consumption. In this paper, we presented a distribution aware replication method for rare objects. Unlike the traditional replication method, we not only replicate the objects but also replicate the peers’ requirement, because we believe that the rare objects are also always rarely queried. Distribution aware can control the number of the copy to avoid unnecessary overhead. Our replication methods are actually index replication named collaborative spread index replication. The distribution aware methods include the multi-hop aware and random walk sampling aware. When execute replicating, the algorithm will decide whether replicating the index or not according to the local distribution information obtained. The experimental results show that distribution aware replication can well support to find the rare objects in unstructured peer-to-peer networks with low overhead.
