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1、Whatisa"Distributed"DataProcessingSystem?PhilipH.Enslow,Jr.GeorgiaInstituteofTechnologyIntroductiondataprocessingmustbesomethingnewandmustrepresentalargeresearcharea.However,whatisWordshaveonlyonepurposeinatechnicalusuallypresentedtodayasdistributeddat
2、aproces-context-thetransmissionofinformation.Whensingisjustawarmed-overversionofanoldconcepttheyfailtodothat,theyleadtoconfusionandwithanewsaleswordattached.misunderstanding."Distributeddataprocessing"Thispaperdiscussessomeoftheessentialcharac-and"dist
3、ributedprocessing"aretwophraseswhichteristicsforanewclassofsystems,stillintheresearchillustratethataxiom.Likemanyotherwordsinthestage,thatwillprovidesomeofthebenefitsgivenlexiconofthecomputerprofessional,thesehaveinthetable.Wedonotdeprecatepresentworki
4、nbecomeclichesthroughover-use,losingmuchofimprovingsystemsforincreasedperformanceortheiroriginalmeaningintheprocess.Thispaperisreliability,evenifithasbeenlabeled"distributedanattempttoreversethattrend.dataprocessing."Rather,wehopetointroduceAgreatmanyc
5、laimsofimprovedperformancesomeprecisionofterminologyandevaluationfor(thetablebelowpresentsonlyapartiallist)arebeingthisnewarea.madefor"distributeddataprocessing"systemsbyvendorsaswellasauthors.'4HardlyanyonereasonablyknowledgeableaboutthecurrentstateWh
6、atisdistributed?oftheartinmultiple-processordataprocessingsys-temswouldclaimthatmajoradvancestowardanyAtleastfourphysicalcomponentsofasystemsignificantnumberofthesegoalsarepossiblewithmightbedistributed:hardwareorprocessinglogic,presenttechnology.Toful
7、fillsuchaclaim,distributeddata,theprocessingitself,andthecontrol(suchastheoperatingsystem).SomespeakofasystemthathasanyoneofthesecomponentsdistributedasClaimsmadefor"distributed"dataprocessingsystems.beinga"distributeddataprocessingsystem."However,adef
8、initionthatisbasedsolelyontheHIGHSYSTEMPERFORMANCE,FASTRESPONSE,HIGHTHROUGHPUTphysicaldistributionofsomecomponentsoftheHIGHAVAILABILITYsystemisdoomedtofailure.AproperdefinitionHIGHRELIABILITYmustalsocovertheconceptsunderwhichtheREDUCEDN
