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1、AbstractWiththedevelopmentofcloudcomputing,Software-as-a-Service(SaaS)hasbeenwidelyapplied.Onlineanalyticalprocessingsystem(OLAP)providesamultidimensionalview,whichfacilitatesthedecision-makerstoanalyzehistoricaldataoftheenterprise,soastomakedecisionbetterandfasterbyunderstandingofthebusinessdeep
2、ly.Therefore,thestudyoftheapproachtomakeOLAPsystemtosupportservicemodelisimportant.AftertheanalysisthedemandofOLAPasaService,thethesisdesignedthearchitectureofOLAPasaServicebasedonclustertechnology,themethodofaserviceinstanceforeachtenantischosenastheImplementationofMulti-Tenancy,thecriticalresou
3、rcesneededbytheexecutionofOLAPserverisregardedastenantperformanceServiceLevelAgreement(SLA).Serviceentranceandschedulingmodulesaretwokeycomponentsofthesystem.Inthedesignoftheserviceentrance,userrequestsarebalancedbystrategybasedontheMACaddressmodificationandalgorithmofweightedleastconnection;toha
4、ndlethemultipleconnectionsatthesametime,theSelectmodelbasedonIOmultiplexingisadopted.InthedesignofSchedulingmodule,thecontractallocationmethod,whichtakestherateofactivetenantsintoconsiderationandusesaminimumloadpriorityallocationstrategy;Afteranalyzingtwodifferentreasonswhyhotspotappears,adoptthe
5、methodofchoosingatenantandredistributeittoothernodestoresolvehotspotissuesduetoresourcecontention,andadoptcontrolstrategiesbasedonloadfeedbacktoaddresshotspotissuescausedbyoveractivetenants9request.Basedonthesystemprototype,aseriesofexperimentshadbeenpreceded,theresultsshowthatthesystemreachedgoa
6、loftheon-demandservice,betteravailability,qualityofserviceandacompleteOLAPfunctionality.Keywords:SoftwareasaService,OnlineAnalyticalProcessing,Multi-Tenancy,ServiceLevelAgreement目录I摘要Abstract1绪论1727/(V1.2国内外概况1.3课题的主要研究工作2联机分析处理服务的整体设计方案2.1联机分析处理服务系统的设计目标2.2联机分析处理服务的设计分析…….2.3联机分析处理服务的整体设计方案3关键子
7、系统的设计与实现3.1联机分析处理服务入口子系统的设计与实现(18)3.2联机分析处理服务调度子系统的设计与实现(23)3.3本章小结(32)4实验与结果分析4.1实验的设计思路(33)4.2实验环境(33)4.3实验与结果分析(34)4.4本章小结(38)5总结与展望5.1全文总结(40)5.2展望(41)致谢(42)参考文献(43)1绪论1.1课题背景在软件即服务模^(SoftwareAsaService,SaaS)屮，服务部署
