Research And Implementation Of Information Retrieval And Dynamic Replication Strategy In Peer-to-Peer Network

With the rapid development and wide popularization of the network technology,traditional distributed storage applications faces enormous challenges. It has become a keyto the development of the Internet how to make full use of information resources under thenetwork environment. The peer to peer (P2P) technology provides some fresh light onnetworked storage.The main purpose is to provide a super-capacity virtual storage space using effectivelythe P2P technology and the free space of nodes for the user in the network in this paper.Users can store and exchange resources in the system. It provides a reliable and inexpensiveservice to users through bringing efficient information retrieval strategy and dynamicreplication strategy into distributed storage system.On systematically analyzed the P2P network technology basis, we study the resourceretrieval and replication strategy on P2P network. It uses two layers architecture. Thenodes are divided into super nodes and ordinary nodes. The upper layer is an unstructuredP2P network composed by super nodes and the lower layer is a centralized networkcomposed by ordinary nodes. Super node manages ordinary node in a group. Then, webrought local index and semantic grouping into the unstructured P2P network andcombined with flooding mechanism. We analyzed the system and verified that thealgorithm has higher efficiency on resource searching. Therefore the algorithm is used torealize the resources searching module of the system. We use smooth algorithm of timeseries and the historical records of the file accessed to predict the hot copy files andperformance formula of the node to calculate the node performance. Then, the dynamicreplication management mechanism based on the smooth algorithm of time seriespredicting is proposed.