一種基于用戶體驗值的副本冗余度管理系統(tǒng)的設(shè)計與實現(xiàn).pdf

1、電子科技大學(xué)碩士學(xué)位論文一種基于用戶體驗值的副本冗余度管理系統(tǒng)的設(shè)計與實現(xiàn)姓名：王全修申請學(xué)位級別：碩士專業(yè)：計算機系統(tǒng)結(jié)構(gòu)指導(dǎo)教師：任立勇20090501AbstraetABSTRACTWiththedevelopmentofpeertopeercomputingparadigm，networkbandwithand，thecapacityofInternetbasedsystems，theend—systemsignoredinth

2、epastbecomeavaluedcomputingresourceHowtoutilizetheendsyst鋤_sresourcestobuildadistributedstoragesystemwithlargescale，highscalability，reliabilityandperformanceindynamicpeertopeernetworkenvironmentisahotresearchtopicinrecen

3、tlyyearsInthisthesis，firstly，itdiscussesandsummarizesthedevelopmentandactualityofdistributedstoragesystemsBasedonsystematicallyanalyzingandsummarizingtherelevantworksonpeertopeertechnology，itdesignsaP2Pbaseddistributedst

4、oragesystem：PPDSSBaesdOnahi曲lyscalableP2Pbasedarchitecture，PPDSSorganizeslargenumbersofnodesdistributedinInteractintoaunitedoverlaynetworkDuetothecomplexityofnetworkenvironment，itisinevitablefortheproblemofsinglestoredno

5、defailureHence，themechanismofmulti—replicahasbeenintroducedintothesystemwhichisinordertoevaluatetheusabilityandreliabilityButwhilethemanagementofthereplica，twosignificantissues，theredundancyandconsistencyofthereplicashou

6、ldbehandledfirstAmongtheexistingtechniques，itisuniversallyacceptedthatthemanagementofreplicaisbasedonthefrequencyThemorefrequentusersaccessafile，themorereplicasthisfileenjoysHoweveratthesametime，thissolutioncannotactuall

7、ysolvereal—worldproblemAssumingthatthecapacityoftheseverisSOadequatetohandletheconcurrenteasilyaccessfromtheclient，thenthereisnoneedtoincreasethereplicatoimprovetheuserexperienceFromtheanalysisaboveitrevealsthatthereiSno

8、necessaryrelationshipbetweenthefrequencyofaccessandthenumberofreplicaThat’Swhythispapertriestoprovideabettermechanismofreplicamanagement，UERM，whichistotallybasedonthefeatureofP2PproxyusedbyPPDSSForinstancewhenthesystemde