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1、fromtheProceedingsoftheNineteenthACMSymposiumonPrinciplesofDistributedComputing(PODC2000),Portland,OR,July16{19,2000AchievingScalabilityandExpressivenessinanInternet-ScaleEventNotificationServiceAntonioCarzanigaDavidS.RosenblumAlexanderL.WolfDept.ofComputerScienceDept.ofInformation&Dept.ofComp
2、uterScienceUniversityofColoradoComputerScienceUniversityofColoradoBoulder,CO80309-0430UniversityofCalifornia,IrvineBoulder,CO80309-0430USAIrvine,CA92697-3425USAcarzanig@cs.colorado.eduUSAalw@cs.colorado.edudsr@ics.uci.eduABSTRACTnumberofpotentialproducersandconsumersofnoti ca-tions,createanop
3、portunityfordevelopingnoveldistributedThispaperdescribesthedesignofSiena,anInternet-scaleevent-basedapplicationsinsuch eldsasmarketanalysis,eventnoti cationmiddlewareservicefordistributedevent-datamining,indexing,andsecurity.Ingeneral,theasyn-basedapplicationsdeployedoverwide-areanetworks.Sie
4、nachrony,heterogeneity,andinherenthighdegreeofloosecou-isresponsibleforselectingthenoti cationsthatareofin-plingthatcharacterizeapplicationsforwide-areanetworksteresttoclients(asexpressedinclientsubscriptions)andsuggesteventinteractionasanaturaldesignabstractionforthendeliveringthosenoti cati
5、onstotheclientsviaaccessagrowingclassofdistributedsystems.Yettodatetherehaspoints.ThekeydesignchallengeforSienaismaximizingbeenalackofsucientlypowerfulandscalablemiddlewareexpressivenessintheselectionmechanismwithoutsacri c-infrastructurestosupportevent-basedinteractioninawide-ingscalability
6、ofthedeliverymechanism.Thispaperfocusesareanetwork.WerefertosuchamiddlewareinfrastructureonthoseaspectsofthedesignofSienathatfundamentallyasaneventnoti cationservice[16].impactscalabilityandexpressiveness.Inparticular,wede-scribeSiena'sdatamodelfornoti cations,thecoveringre-1Thispaperdescribe
7、sthedesignofSiena,anInternet-scalelationsthatformallyde nethesemanticsofthedatamodel,eventnoti cationservicethatisrepresentativeoftheca-thedistributedarchitectureswehavestudiedforSiena'sim-pabilitiesweenvisionforscalableeventnoti cationmiddle
