支持访问控制的P2P大规模遥感数据分发系统

遥感数据日益增长,大规模遥感数据分发对集中分发服务器构成了巨大压力。充分利用参与下载节点的网络资源,提出并实现了一种支持访问控制的P2P大规模遥感数据分发系统。遥感数据分发系统分为遥感数据管理平台和遥感数据客户端两部分,遥感数据管理平台包含共享分发平台网站、云存储、种子资源服务器和跟踪服务器4个组件,遥感数据各客户端和种子资源服务器构成P2P网络。设计了包括共享分片、分片选择、跟踪器通信等的P2P协议,实现的遥感数据分发系统能够上传遥感数据并自动做种,支持对用户的访问控制。根据用户权限进行下载,各下载节点共享分片,然后基于类Bittorrent协议来加速遥感数据的分发。实验结果表明,实现的大规模遥感数据分发系统的功能完善,在多节点下载时具备良好的并发性能,能够满足大规模遥感数据分发的需要。

P2P Based Massive Scalable Remote Sensing Data Distribution with Access Control

With the increasing of remote sensing data,massive scalable remote sensing data distribution may cause big pressure for the distribution center server.Fully utilizing the network resources of joining nodes,a P2P based massive scalable remote sensing data distribution system was proposed and realized.The remote sensing data distribution system consists of remote sensing data management platform and remote sensing data client,where the remote sensing data mangement is composed of the sharing distribution platform web site,the cloud storage,the seed resource server and the tracker,and these remote sensing clients and the seed resource server construct a P2P network.The P2P communication protocol including sharing pieces,piece selection,and tracker communication was designed.The realized system can support uploading data and begining seed automatically with user access control.The users download the remote sensing data based on their user ranks and share and fasten data pieces downloading based on the Bittorrent like protocol.The experiment results show that the realized massive scalable remote sensing data distribution system is fully functional,has excellent concurrent performance while multiple nodes downloading,and satisfies the requirements of massive scalable remote sensing data distribution.