在实时点播系统中对异步的服务请求的处理,是通过在Peer节点上缓存目标节目部分段的数据,让新节点加入时直接从Peer节点获取数据,可以在很大程度上减少对源服务器带宽资源的占用。基于单棵组播树,本文研究如何对Peer节点进行组织,以适应大规模实时点播系统的应用需求。 In the real-time on-demand system, asynchronous service requests are handled by caching the data of the target program segments on the peer node so that the new node can directly obtain data from the peer node when joining the new node. This can greatly reduce the bandwidth of the source server Resource usage. Based on a single multicast tree, this paper studies how Peer nodes can be organized to meet the application requirements of large-scale real-time on-demand system.