基于兴趣簇的CDN-P2P系统中内容搜索定位机制的设计与实现

发布时间：2018-05-21 18:05

本文选题：CDN-P2P + 超级节点　；参考：《北京邮电大学》2015年硕士论文

【摘要】：将CDN和P2P进行融合构成的混合内容分发系统能够充分结合两种技术的优势,提高系统的可扩展能力和可靠服务能力。本文针对CDN-P2P系统中底层P2P分发网络及其构造协议、CDN与P2P的融合以及CDN-P2P中的内容搜索算法三个方面进行了研究： (1)提出了一种基于兴趣簇的混合式P2P网络的拓扑构造协议,它结合了基于超级节点的混合式P2P网络的特点,同时考虑了用户节点对不同类型内容的偏好程度,该构造协议利用节点拥有的各不相同的负载能力值,将所有的普通节点在满足兴趣相似度足够高的前提下,尽可能的聚集到负载能力值较强的超级节点周围,从而使得最终得到的拓扑中超级节点尽量的少,以减少网络中节点间消息交换带来的流量。 (2)将基于兴趣簇的混合式P2P网络与CDN网络进行融合,提出了基于兴趣簇的CDN-P2P混合内容分发系统的模型。为了能充分利用基于兴趣簇的混合式P2P网络较高的可扩展性以及自组织能力,同时保留CDN网络的较高的服务质量和稳定性,通过CDN网络中的边缘服务器对P2P网络中的兴趣簇进行管理来完成二者的融合,并根据融合而成的系统的拓扑结构特点提出了CDN层、P2P层的双层内容分发策略,最终相对于传统的CDN-P2P网络,降低了CDN网络的负载和管理压力,提高了系统的鲁棒性,同时减少了内容分发的平均通信代价。 (3)基于兴趣簇的CDN-P2P系统中的内容搜索算法,在前两个研究点的基础上,设计并实现了在基于兴趣簇的CDN-P2P混合内容分发系统中的内容搜索算法,充分利用基于兴趣簇的拓扑优势,将分布式的内容搜索与中心索引式的搜索相结合,减少了搜索命中需要的跳数,降低了搜索消息转发带来的网络流量。
[Abstract]:The hybrid content distribution system composed of CDN and P2P can combine the advantages of the two technologies and improve the scalability and reliable service ability of the system. In this paper, the integration of P2P distribution network and P2P in CDN-P2P system and the content search algorithm in CDN-P2P are studied. (1) A hybrid P2P network topology construction protocol based on interest cluster is proposed. It combines the characteristics of hybrid P2P network based on super nodes and takes into account the preference of user nodes for different types of content. Using the different load capacity values of each node, the construction protocol gathers all the ordinary nodes around the super nodes with strong load capacity under the premise of satisfying the interest similarity sufficiently. In order to reduce the traffic caused by message exchange between nodes in the network, there are as few super nodes in the resulting topology as possible. The hybrid P2P network based on interest cluster is fused with CDN network, and a model of CDN-P2P hybrid content distribution system based on interest cluster is proposed. In order to make full use of the high scalability and self-organization ability of the hybrid P2P network based on interest cluster, the high quality of service and stability of the CDN network can be preserved at the same time. The interest clusters in P2P networks are managed by edge servers in CDN networks to complete the integration of the two, and according to the topology characteristics of the integrated system, the two-layer content distribution strategy of CDN layer is proposed. Finally, compared with the traditional CDN-P2P network, it reduces the load and management pressure of the CDN network, improves the robustness of the system, and reduces the average communication cost of content distribution. On the basis of the first two research points, we design and implement the content search algorithm in the CDN-P2P hybrid content distribution system based on interest cluster, and make full use of the topology advantage of interest cluster. By combining the distributed content search with the central index search, the hops needed for the search hits are reduced, and the network traffic caused by the search message forwarding is reduced.
【学位授予单位】：北京邮电大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TP393.02

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