一种基于P2P的文件复制策略

文件共享系统作为P2P系统一个广泛的应用,下载速度是衡量系统性能是否优良的一个重要方面,一般都采用多线程下载的方式提高速度。当前P2P文件共享系统面临的一个普遍问题是,某个文件的资源很少甚至只有一个,此时就大大限制了下载速度。而且由于系统中节点可以自由加入和离开,当下载者如果还没有把某个资源文件下载完毕,资源的拥有者就退出了系统,而此时下载者便不可能下载到这个完整的资源文件,由此提出一种资源复制策略。当网络中某个资源很少或者只有一个的时候通过在其他节点预先复制该资源,避免了资源拥有者的离开对整个系统造成的影响,同时也可提高下载速度。

A Copy of the DOCument Based on P2P Strategy

The application of sharing files based on P2P piling up one after another currently,but downloading speed is an aspect that the customer pays attention to very much, generally adopting the program design method of multi-threading and all to raise the downloading speed as far as possible. A kind of widespread circumstance in the system is,while making use of searching function of the system,we get the number of resources provider usually seldom perhaps only 1,the download speed is limited consumedly at this time,and because the node in the P2P system can join and leave freely,if the downloader has downloaded the majority of the resources at that moment,the resources owner leaves that system,then the downloader probably has to abandon the downloaded useless resources at this time,so I put forward a kind of strategy based on virtual resource. According to the comparison to multi-threading downloading,this strategy can raise downloading speed consumedly,also avoiding the influence to the resources downloader because of resource provider leaving system at this time