Based On The Gnutella Network Model Of The Feedback Mechanism

P2P (Peer-to-Peer) is one kind of calculate distributed calculation model through exchanging to realize sharing of resource and service directly, finished the marginalisation of the network service at the same time . After the network service marginalisation, there is a more difficult problem of discovery of resources, if the method of information finding is not perfect, the value of using the network would be given a great discount, so resources finding is a very important problem in P2P systems. At present, there is less to application feedback mechanism into network resources searching in P2P networks, thus it has not fully utilized history of succeeding each time, relatively low to search for efficiency.Gnutella is a kind of typical P2P network model, this text has proposed resources released algorithm based on improved Rumor mongering protocol - BDFB (Bidirection Feedback), and apply it to improvement of Gnutella model. In improved Gnutella, after each search success, the destination node which have the resource and the source which is finding the resource release one message of the resource respectively, form the two-way feedback of resource information. Apply BDFB to the research of resources search of in P2P network, the fully use of success history spreads the information about the resource extensively in the network, raise the popularity of resource in the network, which help search this resource after by other nodes. Though contrast of success rate and redundant messages in experiment, it proves this improvement effective improve the efficiency of resource finding in p2p networks. Meanwhile, this improvement raised the expansibility of Gnutella network too.