云计算专业英语

.,CloudComputing,.,Definition,Cloudcomputingisthedevelopmentofdistributedcomputing,parallelprocessing,andgridcomputing,whichrepresentsanemergingbusinesscomputingmodel,.,CloudComputingSummary,CloudcomputingisakindofnetworkserviceandisatrendforfuturecomputingScalabilitymattersincloudcomputingtechnologyUsersfocusonapplicationdevelopmentServicesarenotknowngeographically,.,Thespecificcharacteristics,Datainthecloud:notafraidtolose,donothavetobackup,youcanrestoreatanypoint;,Softwareinthecloud:Youdonothavetodownloadandupdateyourself；,Ubiquitouscomputing:atanytime,anyplace,anydevice,logintoenjoycomputingservices;,Powerfulcomputing:unlimitedspace,unlimitedspeed,PC,C/S,CloudComputing,Hardware-centric,Software-centric,Service-centric,.,(1)SoftwareasaService(SaaS)SaaSserviceprovidersdeployapplicationsoftwareontheserver,usersondemandorderedfromthemanufacturerviatheInternet,serviceproviderschargebasedoncustomersneeds,andtoprovidecustomerswiththesoftwarethroughabrowser.(2)PlatformasaService(PaaS)Manufacturersprovideadevelopmentenvironment,serverplatforms,hardwareresourcesservicestocustomers,customdeveloptheirownapplicationandpassthroughitsserversandtheInternettoothercustomers(3)Infrastructureservices(IaaS)Cloudinfrastructureconsistingofmultipleservers,providemeasurementservicestocustomers.,Themainformsofservice,.,Originsofcloudcomputing,In2006,GoogleengineerChristophesuggestGoogleCEOEricSchmidttheideaofcloudcomputing“atthefirsttime,underthesupportofSchmidt,GooglerolloutGoogle101planandformallyproposedtheconceptof“cloud.Googlesconceptof“cloudcomputing”isapicturesquephrase,todescribeGooglesbusinessmodelandcomputingtechnologyarchitectureinaromanticway.therefore,cloudcomputingconsiststwolevelsofmeaning,incommerciallevel,justthecloud“;inthetechnicalleveliscomputing,combinedthecloudandcomputingtoillustratethatGoogleisdifferentwithtraditionalsoftwareandhardwarecompaniesinbusinessmodelsandcomputingarchitecture.Thisisjustaverybeautifulandveryromanticmetaphor.,.,TechnicalSupport,.,BriefIntroduction,ApacheHadoopisaframeworkforrunningapplicationsonlargeclusterbuiltofcommodityhardware.TheHadoopframeworktransparentlyprovidesapplicationsbothreliabilityanddatamotion.HadoopimplementsacomputationalparadigmnamedMap/Reduce,wheretheapplicationisdividedintomanysmallfragmentsofwork,eachofwhichmaybeexecutedorre-executedonanynodeinthecluster.Inaddition,itprovidesadistributedfilesystem(HDFS)thatstoresdataonthecomputenodes,providingveryhighaggregatebandwidthacrossthecluster.BothMapReduceandtheHadoopDistributedFileSystemaredesignedsothatnodefailuresareautomaticallyhandledbytheframework.,.,TwoImportantTechnical,HDFSHadoopDistributedFileSystem(HDFS)isdesignedtoreliablystoreverylargefilesacrossmachinesinalargecluster.ItisinspiredbytheGoogleFileSystem.MapReduceMapReduceisaprogrammingmodelforprocessinglargedatasetswithaparallel,distributedalgorithmonacluster.,.,Thechallenge,Cloudstorage,datasecurity,Efficientprocessingcoreandthedevelopmentofstoragemedia,Networkbandwidthlimitationsandcosts,Limitedbythetraditionalmodel,Relatedpoliciesandregulationsneedtobeimproved,Thelackofuniformstandards,.,Thefutureofcloudcomputing,Cloudcomputingisseenasthenextrevolutionofthetechnology