一个基于元数据的对等信息系统模型

A Metadata-based Peer-to-Peer Information System Model

现有的基于DHT的P2P系统使用唯一标识来定位资源,实现了从资源标识到资源位置的一种映射。在这类系统中,用户必须准确知道资源的标识才能访问该资源,它们本质上并不具有搜索能力;同时由于网络中资源的多样性和资源本身的复杂性,仅仅使用一个标识很难准确完整地描述一个资源,经常需要多个属性才可以。因此,文章在DHT的基础上,设计了一个基于元数据的对等信息系统MPIS,它能够根据资源的多个属性来定位所需资源,并且具有很强的搜索能力。

Current DHT-based P2P systems locate a resource by the unique identifier of the resource,and carry out a mapping from resource's identifier to resource's location.But in this kind of systems ,users must know the identifier of the resource accurately to access a resource.These systems do not possess any abilities of search.On the other hand,be-cause of the variety and complexity of resources,describing a resource exactly and integrally can not be accomplished by only a identifier,but needs several properties.Based on DHT,a metadata-based peer-to-peer information system(MP-IS)is designed in this article,which can locate a resource using several properties of the resource and processes good search abilities.