Jitter Environment File Is Copied Node Selection Algorithm And Consistency Maintenance

The rapid increase in today’s world of computer and Internet technology continuesto evolve and network bandwidth occupied the network most of P2P file-sharingtraffic, to become one of the main modes of Internet file distribution. P2P file sharingis the power source of the development of P2P technology, is also one of the mainapplications in the Internet, a very big impact on the use and flow of the network. P2Pfile sharing system by file copy of the spread of file sharing storage andcommunication overhead distribution for each node in the network to provide a highlyefficient, low-cost means of communication.File replication technology is an important file management mechanisms in P2P filesharing system, increase the copy of the file to the file system to improve theavailability and reliability of the system files, and thus improve the performance ofthe system as a whole. However, the P2P resource sharing is still a lot of problems, ifthe server side to accept queries on the same file at the same time, it will causeoverload eventually led to the response delay, hot file will consume bandwidth,resulting in low file sharing query the validity. The file replication is an effectivemethod to deal with this problem, usually by reducing server in response to the delaysand reducing the method of the query paths. The major consideration is the selectionof the file replication node. P2P file system replication technology is a valuableresearch topic is to ensure high reliability and availability of key, but the file creationand file consistency maintenance problems caused due to the frequent updates of thefile still has not been an effective solution to difficulty.This paper studies the P2P file sharing system files copied node selection andconsistency maintenance algorithm. First introduced the basic theory of P2P systems,through the analysis of the existing file-sharing system, pointing out the problemswhich exist. And copy the file in the file sharing system at home and abroad studyprogress, introduced three typical file copy selection method, and copy the fileselection algorithm to analyze and summarize, a widespread problem in the algorithm:spend high hit rate is low, the delay caused by the failure of large and the node thetopology will continue to transform. On the basis of analysis of the results of previousstudies, the improved performance of node selection, increasing the number ofindicators, and the node number of hops formula to improve, and on the basis ofrelatively high performance, considering the dynamic problem, select goodperformance, stability nodes as replication nodes. Static and dynamic copy document management strategy after detailed analysis ofexisting P2P file sharing system file copy management technology, and pointed outthe problems in the existing method. According to the copy text managementtechnology present situation and the existing problems, combined with P2P filesharing system proposed a copied file node selection algorithm: Select algorithmbased on the dynamic environment under the node.Next, P2P file sharing in dynamic and frequently updated sex files consistencymaintenance problems caused study, first introduced consistency maintenance workand problems, and on several of the more popular consistency maintenance algorithmFinally, we propose the integration algorithm based dynamic environment filereplication and consistency maintenance.Finally, a summary and description of the full text of the work and the focus offuture research.