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1、AbstractAbstractAsthescaleandcomplexityofadistributedsystemincrease,theissueofreliabilitybecomesincreasinglyimportantbuthardtoachieve.However,asystem’sreliabilityisespeciallyimportantforsomecriticalfields,e.g.aerospace,military,finance,andmedical,etc.Failuredetectionisoneofthefundamentalessentialco
2、mponentstoachievereliabledistributedsystems.Becauseoftherapidexpansioninscaleofsystems,adaptationandscalabilityoffailuredetectionbecomeveryimportant.Somecriticalproblemsrelatedtothesetwoattributionsarestudiedinthispaper.Theadaptivefailuredetectorwhichcanadapttomultipleapplicationrequirementsisfirst
3、lystudied;thenaimingtohierarchicaldetectionmethod,theavailabilityofLeadernodeanddetectionoffaultylinkarestudied.Theresultsofthepapercanbeappliedintodesignofhierarchicaldetection,andprovidetheoreticalsupportforthemechanismoffailuredetectionoflargescaledistributedsystems.Therearelargenumbersofdistrib
4、utedapplicationswithdifferentQoS(QualityofService)offailuredetectionindistributedsystems.Thus,inordertokeepitsefficiencyandscalability,afailuredetectorshouldnotonlyprovideQoSofaccuratefailuredetectionformultipleapplications,butalsoavoidredundantloadsofdesigningmultipledetectorsfordifferentQoS.There
5、fore,anewfailuredetectorQA-FD(adaptivefailuredetectorbasedonQoS)ispresented,whichadoptsheartbeatdetectionstrategybasedonPULLmode.QA-FDcanprovideQoSoffailuredetectionformulti-applicationsaccordingtoquantitativeQoSmetrics(ULU,TD,T,T)MRManddoesnotneedanyhypothesisaboutmessagebehaviorandclocksynchroniz
6、ation.Inaddition,itprovesthatQA-FDimplementsafailuredetectorthatbelongsto◇P
inthepartiallysynchronousmodel,andtheexperimentalresultsaregivenintheend.
Themethodofhierarchicaldetectionisanimportantmethodtogreatlyreduce
detectioncostsandeffectivelyimprovescalabilityofsystem.Ithoweversuffersfrom
thesin
7、glepointoffailureineachgroup,andtheLeadernodeofeachgroupthus
bencomesreliabilitybottleneckofsystem.AsolutionofhighavailableLeadernode
isproposed,whichadoptsdualfault-tolerancemechanismbasedonarbitration.Fir