基于集群的VOD系统视频服务器的设计实现

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1、华中科技大学硕士学位论文基于集群的VOD系统视频服务器的设计实现姓名：汪洋申请学位级别：硕士专业：交通运输工程指导教师：李天匀20061001华中科技大学硕士学位论文AbstractForrecentyears，tosatisfytheincreasingaccessloadingrequirementsofInteractvideoservices，VODsystemislikelytofaceanumberofchallengesatboththenetworkandsewerside．Withthenetw

2、orkbandwidthincreasingmuchfasterthanthesewercapacity,moreandmorebottleneckswillbeobservedonthesewerside．Clusterbecomesacomparativeidealmethodforenhancingtheperformanceofvideoserverbecauseofitsloadbalancing，high-availabilityandscalability．Thispapermadeasystema

3、ticresearchoftheVODvideoserverclustersystemdesignandimplementation，andtriedtouseadistributedarchitecturetomakecommonPCSavideoserverwithloadbalancing，high—availability．scalabilityandhigh-performanceforthepurposeofbuildingalarge—scalevideoserversystem．Afteranal

4、yzingthebasicstructureofVODsystemandclustertechnology，weproposedaVODvideosewerclustermodelwhichisconsistingofWideAreaNetwork(WAN)frameworkandLocalAreaNetwork(LAN3framework．ThedistributedVODsystemunderWANframeworkincludesacenterandSeveralsub-centers，andeverysu

5、b—centerworkinaLANwhichhasavideosewerclustersysteminit．Avideosewerclusteralsoincludestwoparts：aclustermanagementnodeandseveralvideosewicenodesFirstly，thedesignforloadbalancing，high-availabilityandscalabilityofLANvideoseverclustersystemisdescribed．Loadbalancin

6、gisimplementedbytheloadbalancingschedulingcomponent，whichisontheclustermanagementnodeofvideoseverclustersystem，byusingcerminloadbalancingalgorithm．ThepaperpresentsaloadbalancingalgorithminapplyingtoVODsewerbasedonastudyofcommonloadbalancingalgorithmswhilecons

7、ideringthecharacteristicsofvideofiles，likestorage，playingmodeandstreamrate．High-availabilityschemeofclustermanagementnodeandvideoservicenodearediscussed．Toavoidsinglepointoffailure，dustermanagementnodeusesabackup．AndvideoservicenodeUSeSheartbeatmessagetoconne

8、ctwithclustermanagementnodewhich啪detectandtakeoveritsfailure．DynamicextensionCalladdvideoservicenodeswithoutchangingthecurrentmimingstatus．Inaddition，schemesforloadbalancingandscalability