一种基于p2p的分布式文件共享系统的设计与实现

《一种基于p2p的分布式文件共享系统的设计与实现》由会员上传分享，免费在线阅读，更多相关内容在学术论文-天天文库。

1、ABSTRA(玎ABSTRACTWiththerapidincreaseoftheIntemetnodesincomputingpower,diskspaceandnetworkbandwidth，Internetapplicationsforfileresourcessharinghasbeendevelopingrapidly．Richerfileresources，higherreliability,moreefficientdatatransmission，betterloadbalancingandlowercosthavebecomethenewgoalstopursue

2、forfilesharingusers．P2Psystem。bysharingsomeresourcesofnodes，suchaSprocessors，diskspace，networkbandwidth，ete，allowsuserstodirectlyuseothernodes’sharedresourceswithouttheneedtoobtainformparticularservers．PeernodesinP2Pnetworkarenotonlyownersofresources，butalsoresourcesrequesters．P2Ptechnologyhasb

3、eenusedwidelyinfilesharing，distributedcomputing，collaborativework，real-timecommunication，searchengines，etc．Inthisthesis，adistributedfilesharingsystembasedonP2Pispresented，byanalyzingandsummarizingthedevelopmentoffilesharingsystem，andP2Ptechnology．SystemnodescomposeanoverlaynetworkthroughP2Ptech

4、nology,andnodestakeadvantageoftheseresources，tobuildalarge—scale，low—cost，highscalability,highreliability,high—performancedistributedfilesharingsystem．Thesystemusesthecentralizedtopology,inordertoefficientlyimplementthesystemloadbalancingandfileupload，download，query,andsystemmanagement．Atthesam

5、etime，thefullydistributedunstructuredtopologyisabackuparchitecturetouse．Iftheindexserverfails，thesystemwillautomaticallyconverttothefullydistributedunstructuredtopology．Thisgreatlyenhancedthereliabilityofthesystem．Inordertoimprovetheoperatingefficiencyoftheindexserver,thesystemusesthememory-map

6、pedfiletechnologytoimprovetheefficiencyofreadandwriteoffiles，andusethesocketI／OcompletionportmodeltoimprovethesocketsI／Oefficiency．Throughloadbalancing，thesystemCantakefulladvantageofdiskspace，computingandbandwidthresourcesofeachnodeintheP2Poverlaynetwork，therebyenhancingthesystemscalabilityand

7、diskspaceutilization．ByusingdynamiccopY,thenumberandlocationoffilesCanbechangedaccordingtosystemrequirements．ManyofthespecificimplementationstrategyinthissystemCanachievethefreedomtoconfigure．IfII——一．．一一——一．!!星鱼!!!!!!afileisdelete