MACROMEDIA FLASH MEDIA SERVER 2-SERVER-SIDE ACTIONSCRIPT LANGUAGE Guide d'installation télécharger pdf (Page 44)

TypicallyEdge/Origindeploymentsarebestusedwithone-waystreamingservices.Whenusing

customserver-sideapplicationstoenablereal-timecommunication,theEdgeserverstrictly

handlestherequestsonbehalfoftheOriginserver.Clientconnectionsthenmakeround-tripsto

theOriginservertoruntheapplication.

InFlashMediaInteractiveServer3,Edge-levelsupportforbandwidthdetectionandstream

lengthdetectionhasbeenintegrated.erstserverinthechain(EdgeorOrigin)receivinga

stream call will also handle the bandwidth check and stream length check without calling the

Originserverscriptlayer.isfeatureiscompatiblewiththeFLVPlaybackcomponentfor

Flash8orFlashCS3Professional.

Whenaclientrequestisreceived,theEdgeserverwillhandlethetasksitcan,thenwillmakea

connectiontotheOriginserverforanyadditionaldatarequired.WhentheOriginserverfullls

therequest,thedataissentbacktotheEdgeserver,thenontotheclient.Totheclient,itappears

thattheconnectionismadedirectlytotheapplicationrunningontheOriginserver.

eEdgeserverservesasa“traccop”—handling connection overhead, authentication, and

otheradministrativeduties—freeingupvaluablesystemandnetworkresourcesfortheOrigin

server.Everyconnectionandconnectionattemptconsumesresourcesoverandabovetheactual

stream data owing through the connection. As the number and frequency of connections

increase,theloadcanbeexcessive;adverselyaectingserverperformance.eEdgeserver

greatlyreducesthisloadbyaggregatingconnections.eEdgemultiplexestheconnectionsfrom

alargenumberofclientsintooneconnectiontotheOriginserver.Allcommunicationsbetween

EdgeandOriginserversaretransparenttoclients.

eEdgeserveralsostorestheprerecordedmediacontentreceivedfromtheOriginserverina

cache,whichisthenmadeavailabletootherclientsthatconnecttotheEdgeserver.Caching

staticcontentfurtherreducestheloadontheOriginserver.

Deployment strategies

AsimplewaytodistributeloadamongEdgeserversistoassignusersinageographicalregionor

otherdelineationtoaspecicEdgeserver.Forexample,oneEdgeservermayaggregateand

forwardrequestsfromclientsinLondon,whileanothermayhandlerequestsfromTokyo.

AtypicalnetworkedFlashMediaServerdeploymentcaninvolvemultipleEdgeservers,deployed

eitherindividuallyorinclusters.Edgeserverscanalsobechained,allowingevenfurther

distribution of trac.

ToenabletheEdge/Originfeature,youcancongureanyserverinyourclusterasyourOrigin

server(orservers),andtherestasyourEdgeservers.AlleditionsinanEdge/Origincongura-

tionmustbethesame(forexample,youcannotmixFlashMediaStreamingServerandFlash

MediaInteractiveServereditionsinacluster).

Deployment

Large-scaleFlashMediaServerdeploymentsaresupportedwiththeFlashMediaServer

Edge/Originconguration.ForanintroductiontoFlashMediaServerEdge/Origin,please

refer to the Using Flash Media Server Edge Serversmanual.ForinstructionsforsettingupanEdge

server,refertothe“InstallingEdgeservers”sectionintheInstalling Flash Media Server 2 manual.

Edgeserversarealsoreferredtoasproxyservers.erearefourwaystocongureaFlashMedia

ServerEdge(orproxy)server:

• Clientauto-discoveryproxy

• Serverauto-discoveryproxy(reverseproxy)

• ExplicitURI

• ImplicitURI(recommended)

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