基于P2P的内容分发网络关键技术研究
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摘要
随着互联网技术的发展,互联网上能提供越来越多的应用服务。网页、图片、音频、视频等各种内容数据在网络上激增。人们通过互联网获取各种数据内容资源。随着数据内容与用户数量的增长,内容分发给内容提供商带来了问题。首先,用户分布在各地,而服务器采用集中方式部署。在这种情况下用户到服务器的距离较远不能保障服务质量,访问内容有较大的延迟。其次,内容的访问数量的激增使得带宽消耗过大,容易产生瓶颈,影响内容的访问体验。内容分发网络技术(CDN, Content Delivery Networks)就是在这种背景下诞生的。内容分发网络通过在网络边缘部署服务器,把内容分发到边缘服务器中。用户的请求被导向到最近的边缘服务器,从本地获取内容。
本论文主要研究如何通过P2P技术改进内容分发网络,提高内容分发网络的性能。本论文的贡献包括五个方面：第一,设计了一种双层核心的基于P2P的内容分发网络架构DLC-PCDN,改进了现有架构；第二,提出了一种基于谱系图的内容分发策略SDPC-CDS,解决了传统分发方法不支持服务区分的问题,通过基于谱系图的分发决策树优化了分发的性能；第三,提出一种全局资源发现算法Gl-Hop,设计了一种新型的消息传播算法。这种消息传播算法更适合CDN系统环境,比传统算法具有更快的消息传播速度,从而会减少错误查找率,提高内容资源发现系统的性能；第四,设计了一种局域内容路由算法LCRR用于在服务器协作组范围内路由内容请求,提高了内容请求的性能；第五,提出了一种协作式缓存更新部署策略EPP-CPS,通过内容的更新部署策略把内容对象有效地部署在缓存服务器中,解决了缓存服务器协作度较低的问题,从提高缓存服务器的协作度的角度提高了缓存的性能。
With the development of Internet technology, the Internet can provide more and more application services. The contents like web pages, images, audio, video, and other data on the network are increasing. With the growth in data content and the number of users, content providers have some problems with content distribtuion. Firstly, the user distribution in the edge of network, but the servers were centralized deployed in the network. There are some distances from the clients to the servers, so in this case the user can not guarantee the quality of service and access the contents with larger delay. Secondly, bandwidth consumption of content access is too large, and the concentrated servers became a bottleneck affecting experience of clients access to the contents. The content delivery network (CDN, Content Delivery Networks) was born in this context. Content distribution network distribute the contents to the edge servers that deployed at the network. Client requests were directed to the nearest edge server to get contents.
In this thesis we study how to improve the performance of content distribution networks through P2P technology. The contributions of this thesis includes five aspects:Firstly, a P2P-based content distribution network architecture called DLC-PCDN was designed to improve the existing structure; A content distribution strategy based on the pedigree chart SDPC-CDS was proposed to solve the problem of the traditional distribution method does not support service differentiation, and it optimize the performance of the distribution through the distribution decision tree;A global resource discovery algorithm G1-hop was proposed, which is based on1-hop. A new type of message propagation algorithm in Gl-hop was designed. This message propagation algorithm is more suitable for the CDN system environment, and it faster than the traditional algorithm, so it can reduce the lookup error rate, and improve the content resource discovery performance of the system; A local content routing algorithm LCRR was proposed to improve the contents requested performance; A collaborative cache update deployment strategy EPP-CPS was proposed. It resolve the problem of cache server collaboration, and it can improve cache performance.
本论文主要研究如何通过P2P技术改进内容分发网络,提高内容分发网络的性能。本论文的贡献包括五个方面：第一,设计了一种双层核心的基于P2P的内容分发网络架构DLC-PCDN,改进了现有架构；第二,提出了一种基于谱系图的内容分发策略SDPC-CDS,解决了传统分发方法不支持服务区分的问题,通过基于谱系图的分发决策树优化了分发的性能；第三,提出一种全局资源发现算法Gl-Hop,设计了一种新型的消息传播算法。这种消息传播算法更适合CDN系统环境,比传统算法具有更快的消息传播速度,从而会减少错误查找率,提高内容资源发现系统的性能；第四,设计了一种局域内容路由算法LCRR用于在服务器协作组范围内路由内容请求,提高了内容请求的性能；第五,提出了一种协作式缓存更新部署策略EPP-CPS,通过内容的更新部署策略把内容对象有效地部署在缓存服务器中,解决了缓存服务器协作度较低的问题,从提高缓存服务器的协作度的角度提高了缓存的性能。
With the development of Internet technology, the Internet can provide more and more application services. The contents like web pages, images, audio, video, and other data on the network are increasing. With the growth in data content and the number of users, content providers have some problems with content distribtuion. Firstly, the user distribution in the edge of network, but the servers were centralized deployed in the network. There are some distances from the clients to the servers, so in this case the user can not guarantee the quality of service and access the contents with larger delay. Secondly, bandwidth consumption of content access is too large, and the concentrated servers became a bottleneck affecting experience of clients access to the contents. The content delivery network (CDN, Content Delivery Networks) was born in this context. Content distribution network distribute the contents to the edge servers that deployed at the network. Client requests were directed to the nearest edge server to get contents.
In this thesis we study how to improve the performance of content distribution networks through P2P technology. The contributions of this thesis includes five aspects:Firstly, a P2P-based content distribution network architecture called DLC-PCDN was designed to improve the existing structure; A content distribution strategy based on the pedigree chart SDPC-CDS was proposed to solve the problem of the traditional distribution method does not support service differentiation, and it optimize the performance of the distribution through the distribution decision tree;A global resource discovery algorithm G1-hop was proposed, which is based on1-hop. A new type of message propagation algorithm in Gl-hop was designed. This message propagation algorithm is more suitable for the CDN system environment, and it faster than the traditional algorithm, so it can reduce the lookup error rate, and improve the content resource discovery performance of the system; A local content routing algorithm LCRR was proposed to improve the contents requested performance; A collaborative cache update deployment strategy EPP-CPS was proposed. It resolve the problem of cache server collaboration, and it can improve cache performance.
引文
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