高可用性P2P文件共享系統(tǒng)關(guān)鍵技術(shù)研究.pdf

1、華中科技大學碩士學位論文高可用性P2P文件共享系統(tǒng)關(guān)鍵技術(shù)研究姓名：李志永申請學位級別：碩士專業(yè)：計算機應用技術(shù)指導教師：黃曉濤20070126華中科技大學碩士學位論文IIAbstractWiththerapiddevelopmentofInterthenumberofIntersgrowexponentially.Howtomakeefficientuseofwkresourcesconcernstotheindustry.P2Pte

2、chnologycanreasonablyfullyutilizeallstsofwkresources.P2PfilesharingistheearliestapplicationthehotspotoftheP2Presearch.ToimplementahighavailableP2Pfilesharingsystemmanyfactsneedtobeconsideredincluding:establishingP2Pwkcon

3、nectionslocatingresourcesfiletransferavoidingthehotspotdataavailability.Howtoimprovetheefficiencyofresourcesaccessdataavailabilityisofparticularimptance.CurrentlythemajityofP2Pfilesharingsystemsearchresourcesusingafilena

4、mebasedmatchingstrategy.Howeverbecauseofthediversityofwkresourcesthecomplexnatureoftheresourceitselffilenameishardtoaccuratelycompletelydescribearesource.Metadatacanbethoughtofas“dataaboutdata”.Anyaspectofthefilecontenth

5、oldingusers’interestscanbeusedasmetadata.InP2Pfilesharingsystemtoaddavarietyofmetadatamarkingthefilecontentinthesearchrequestcangreatlyimprovetheaccuracyoftheresults.Inlargescaleofp2pwkindertogethighdataavailabilitytoact

6、ivelyreplicatedatatoothernodesisusedtoincreasedataredundance.Dataresourcesarecopiedasawholefilefromnodetonodetocreatereplicas.Usingafilepartitionbasedreplicationstrategythedatafileispartitionedintopieceswhichwillthenbedi

7、stributedcopiedwithinacollectionofnodeedbefeh.Itcansufficientlyusesthewkbwidthobviouslyreducethereplicationtimecostavoidcongestion.MeanwhileErasurecodetechnologycanalsobeusedtoincreasethedataredundancy.Dataobjectissegmen

8、tedthencodedintoseveralpiecesofdata.Dataredundancyexistsbetweenthesedatablocks.IteffectivelyimprovesdataavailabilitypersistenceinsystembydistributingstingthesedatablocksinP2Pwk.Itresolvesthe“seedingproblem”inP2Pfileshari