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CloudComputing 2020 3 20 1 Definition Cloudcomputingisthedevelopmentofdistributedcomputing parallelprocessing andgridcomputing whichrepresentsanemergingbusinesscomputingmodel 2020 3 20 2 CloudComputingSummary CloudcomputingisakindofnetworkserviceandisatrendforfuturecomputingScalabilitymattersincloudcomputingtechnologyUsersfocusonapplicationdevelopmentServicesarenotknowngeographically 2020 3 20 3 Thespecificcharacteristics 可编辑 Datainthecloud notafraidtolose donothavetobackup youcanrestoreatanypoint Softwareinthecloud Youdonothavetodownloadandupdateyourself Ubiquitouscomputing atanytime anyplace anydevice logintoenjoycomputingservices Powerfulcomputing unlimitedspace unlimitedspeed PC C S CloudComputing Hardware centric Software centric Service centric 2020 3 20 4 可编辑 1 SoftwareasaService SaaS SaaSserviceprovidersdeployapplicationsoftwareontheserver usersondemandorderedfromthemanufacturerviatheInternet serviceproviderschargebasedoncustomer sneeds andtoprovidecustomerswiththesoftwarethroughabrowser 2 PlatformasaService PaaS Manufacturersprovideadevelopmentenvironment serverplatforms hardwareresourcesservicestocustomers customdeveloptheirownapplicationandpassthroughitsserversandtheInternettoothercustomers 3 Infrastructureservices IaaS Cloud infrastructureconsistingofmultipleservers providemeasurementservicestocustomers Themainformsofservice 2020 3 20 5 Originsofcloudcomputing In2006 GoogleengineerChristophesuggestGoogleCEOEricSchmidttheideaof cloudcomputing atthefirsttime underthesupportofSchmidt Googlerollout Google101plan andformallyproposedtheconceptof cloud Google sconceptof cloudcomputing isapicturesquephrase todescribeGoogle sbusinessmodelandcomputingtechnologyarchitectureinaromanticway therefore cloudcomputingconsiststwolevelsofmeaning incommerciallevel justthe cloud inthetechnicallevelis computing combinedthecloudandcomputingtoillustratethatGoogleisdifferentwithtraditionalsoftwareandhardwarecompaniesinbusinessmodelsandcomputingarchitecture Thisisjustaverybeautifulandveryromanticmetaphor 2020 3 20 6 TechnicalSupport 2020 3 20 7 BriefIntroduction ApacheHadoopisaframeworkforrunningapplicationsonlargeclusterbuiltofcommodityhardware TheHadoopframeworktransparentlyprovidesapplicationsbothreliabilityanddatamotion HadoopimplementsacomputationalparadigmnamedMap Reduce wheretheapplicationisdividedintomanysmallfragmentsofwork eachofwhichmaybeexecutedorre executedonanynodeinthecluster Inaddition itprovidesadistributedfilesystem HDFS thatstoresdataonthecomputenodes providingveryhighaggregatebandwidthacrossthecluster BothMapReduceandtheHadoopDistributedFileSystemaredesignedsothatnodefailuresareautomaticallyhandledbytheframework 2020 3 20 8 TwoImportantTechnical HDFSHadoopDistributedFileSystem HDFS isdesignedtoreliablystoreverylargefilesacrossmachinesinalargecluster ItisinspiredbytheGoogleFileSystem MapReduceMapReduceisaprogrammingmodelforprocessinglargedatasetswithaparallel distributedalgorithmonacluster 2020 3 20 9 Thechallenge Cloudstorage datasecurity Efficientprocessingcoreandthedevelopmentofstoragemedia Networkbandwidthlimitationsandcosts Limitedbythetraditionalmodel Relatedpoliciesandregulationsneedtobeimproved Thelackofuniformstandards 2020 3 20 10 可编辑 Thefutureofcloudcomputing Cloudcomputingisseenasthenextrevolutionofthetechnologyindus
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