基于数据日志变动的消息中间件技术研究的中期报告[Abstract]Themessagemiddlewaretechnology,whichisbasedonthechangeofdatalogs,hasbecomeanimportantresearchdirectioninrecentyears.Thistechnologyaimstosolvetheproblemofreal-timedatasynchronizationandeventnotificationindistributedsystems.Inthismid-termreport,wereviewthecurrentresearchprogressofthistechnology,includingitsclassification,characteristics,andmaintechnicalchallenges.Meanwhile,weproposesomefutureresearchdirections.[Introduction]Inrecentyears,thedevelopmentofdistributedsystemshasbroughtmanytechnicalchallenges,oneofwhichishowtoachievereal-timedatasynchronizationandeventnotification.Thetraditionalmessagemiddlewaretechnology,suchasmessagequeuesandpublish-subscribesystems,cannotmeettherequirementsofreal-timedatasynchronizationandeventnotificationindistributedsystems.Therefore,anewmessagemiddlewaretechnology,whichisbasedonthechangeofdatalogs,hasemerged.Thistechnologyusesdatalogsastheunderlyingdatastoragemechanismandcaptureschangesindatalogsasevents.Whenthedatachanges,themessagemiddlewaresendseventnotificationstoallsubscribersinreal-time,ensuringtheconsistencyandtimelinessofdatasynchronization.Thistechnologyhastheadvantagesofhighavailability,datadurability,andhighefficiency,whichmakesitwidelyusedinvariousdistributedsystems,suchasfinancialsystems,e-commercesystems,andsoon.[ResearchStatus]Theresearchonthemessagemiddlewaretechnologybasedonthechangeofdatalogsmainlyincludesthefollowingaspects.1.ClassificationThemessagemiddlewaretechnologybasedonthechangeofdatalogscanbedividedintotwocategories:log-basedmessagingandchangedatacapture(CDC).Log-basedmessagingcapturesthechangesindatalogsandgeneratescorrespondingevents,whicharethensubscribedbysubscribers.Ithastheadvantagesofhighavailabilityanddurability,butitalsohassomeshortcomings,suchashighlatencyandlowefficiency.CDCcapturesthechangesinthedatabaseandgeneratescorrespondingevents,whicharethensubscribedbysubscribers.Ithastheadvantagesoflowlatencyandhighefficiency,butitalsohassomeshortcomings,suchas