數(shù)據(jù)網(wǎng)格副本策略研究.pdf

1、上海交通大學上海交通大學碩士學位論文數(shù)據(jù)網(wǎng)格副本策略研究數(shù)據(jù)網(wǎng)格副本策略研究專業(yè)名稱：專業(yè)名稱：控制理論與控制工程控制理論與控制工程作者姓名：作者姓名：王馳王馳指導老師：指導老師：施亮施亮IIABSTRACTDataGridhastheabilitiesofdistributedstagewhichisabletocontaindatainvariousfmats.It

2、sappearanceprovidesagoodsolutionofmagnanimousdataprocessing.Replicaistheoneofthemostimptantkeytechniqueindatagrid.Theyareabletoreducethedelayofdatatransferimprovetheefficiencyofdataaccessprocessing.Theexistenceofreplicac

3、analsodetracttheaccessrequirementsofdataoniginalnodebalancethewkloadofnodesingridconsequentiallyoptimizetheperfmanceofthewholewk.Besideswhensomenodesareinvalidreplicaarealsoabletoreducethepossibilitiesofdatalostenhanceth

4、estability.Currentresearchesonreplicaindatagridarefocusontheconcentrativelookuptablemodel(e.g.Globus，Europedatagridproject).Inthesemodelstheperfmancesofkeynodeslimittheperfmanceofwholesystem.Inthisthesiswedesignareplicas

5、ystemwithoutkeynodeswhichrefersthecurrentP2Ptechnique.Themainfunctionsofthissysteminclude:replicacreationreplacementreplicalocationreplicaupdate.Theslipwindowstechniqueisintroducedinstrategyofreplicacreationreplacementwh

6、ichisabletomakeimmediateresponsestothechangeofwkthemoduleofreplicalocationobtainsthelocationsofreplicaaccdingtodatarequired.DHTtechniquecandistracttheinfmationofreplicaintomethanonenodethereplicaupdatemoduleusestheloosea