分布式流处理系统arts-sh的负载管理策略-load management strategy for arts - sh distributed stream processing system.docx
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分布式流处理系统arts-sh的负载管理策略-load management strategy for arts - sh distributed stream processing system
AbstractThedata streamsystem is always overloadedat the running timebecause thedata stream is unpredictable,brusty,high ,continuous , andthe available systemresources are limited.It leads to the system latencydeterioratedand the system can not providetheti- melyresponse.Under these conditons thegiven answers willhaveno value.Soit is nece- ssaryto reasearch on theload management policiesincludingthe dynamiclymovingload policyand theload sheddingpolifyin thedistributed data stream system.An improved policenamedbidding load movingpolicyfits our developed ARTs-SH systemwasproposedbasedonanalysingthepresentmovingloadpoliciesattherun-time ofthedistributeddatastreammanagementsystem.Itcanimplementmovingtheload acrossthenodes,reducingthelatencyofthesystem.It fitsforwidelyrange.Different querieshavedifferentimportanceinoursystem,however,previousloadsheddingpolicies ofthedatastreamsystemarealmostassumethatallqueriesareequallyimportant.So theydonotfitsforoursystem.Anewloadsheddingpolicybased-onunequalpriorityon different queryis is proposed.Somemain factorsofthequeries are consideredand selectedtodeterminetheprioritiesofthequery.Basedonthemtheprioritiesoftheinput streamsisdetermined.Thendifferentsamplecoefficientwassettedondifferentstreams,so moreimportantqueriescanmakemoreconvincingoutputs,.Theloadsheddingpolicycan provide a good QoS.Theloadmanagement policyofthedatastreammanagementsystemwasresearched. Thebiddingloadmovingpolicyandtheloadsheddingpolicybased-onunequalpriorities’ querieswereproposed.Thebenefitsofthemwereconfirmedbytheoryanalysisand experiments .Keywords: data stream;continuous query ;priority of the query ;load shedding;loadbalancing目录摘要IAbstractII1绪论1.1 研究背景(1)1.2 流处理系统的负载管理策略国内外研究现状(3)1.3 主要研究内容(5)1.4 论文的结构(5)2分布式流处理系统ARTS-SH体系结构2.1 分布式流处理系统ARTS-SH体系结构(7)2.2 功能特性(10)2.3 负载管理器模块与系统中其它模块之间的关系(10)2.4 负载管理器模块的体系结构(11)2.5 负载管理器模块的特性(12)2.6 本章小结(13)3ARTS-SH系统的动态负载平衡策略3.1 负载平衡技术(14)3.2 现有的几种典型负载平衡策略(17)3.3ARTS-SH系统中的负载迁移策略(21)3.4 本章小结(25)4ARTS-SH系统的降载策略4.1 问题的介绍(26)4
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