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ProActive Infrastructure

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ProActive InfrastructureVision --> GoalImagineStarting Point: Transcoding ProxiesBasic ApproachStructured ArchitectureBehaviorArchitecture BenefitsWide-Area PathsOperators/ConnectorsPath Formation, Optimization, InteroperabilityTopGun Wingman/MediaboardCampus-wide Testbed (Millennium)MilestonesProActive InfrastructureEric Brewer, David Culler, Anthony Joseph, Randy KatzComputer Science DivisionU.C. Berkeleyninja.cs.berkeley.eduActive Networks Workshop, July 19987/16/98ARPA Active Nets2Vision --> Goal•The next internet revolution will come from enabling component services and pervasive access.=> Enable programatic creation and composition of scalable, highly available, customizable services that adapt automatically to the characteristics of the end devices (clients, sensors, and actuators) and their connectivity through the network.•Arbitrarily powerful services on arbitrarily small clients through integration with a powerful, proactive infastructure7/16/98ARPA Active Nets3Imagine•You walk into a room,•your Palm Pilot V discovers the devices there and builds a user interface for them;•it discovers the path out into the infrastructure to your personal information space which is searching, filtering, and transcoding on your behalf•and you have complete, secure, optimized access from a spectrum of devices available to you.7/16/98ARPA Active Nets4Starting Point: Transcoding ProxiesStationarydesktopsInformation appliancesScalableServers7/16/98ARPA Active Nets5Basic Approach•Create a framework that enables programatic generation and composition of services out of strongly typed reusable components•Key Elements–structured architecture with a careful partitioning of state»Bases, Active Routers, and Units–wide-area paths formed out of strongly-typed components»Operators and Connectors–execution environments with efficient, but powerful communication primitives»Active Messages + capsules7/16/98ARPA Active Nets6Structured Architecture•Bases–highly available–persistent state–databases, computing–agents–“home” base per user•Active Routers–soft-state–well-connected–localization•Units–sensors/actuators–PDAs/Smartphones–Laptops, PCs, NCs–heterogenous7/16/98ARPA Active Nets7Behavior•Units find ARs•Build a “wide area path” of connectors and operators to service.•Active transformation at each step•Careful management of stateUnitsActiveroutersBases7/16/98ARPA Active Nets8Architecture Benefits•Mobility–any AR + home base•State–soft-state at Ars, persistent at Bases•Scalability, Availability–Units use Smart Clients approach at AR–Bases provide service programming environment»TACC + persistence + customization•Enables extremely simple clients7/16/98ARPA Active Nets9Wide-Area Paths•Path is first-class entity•Explicit or automatic creation•Can change dynamically–change path or operators•Unit of authentication -- delegate along the path•Unit of resource allocation7/16/98ARPA Active Nets10Operators/ConnectorsOperators:–transformation–aggregation–agentsConnectors:–abstract wires–ADUs–varying semantics–uni/multicastInterfaces:–strongly typed–language independent–control channel»path changes»authentication»feedback7/16/98ARPA Active Nets11Path Formation, Optimization, Interoperability•Service discovery query finds logical path of operators•Place operators onto nodes•Connectors are polymorphic–entire path must type check - statically•Add (or transpose) operators –forward error-correction–compression/decompression•Change parameters, reroute•Wrapper operators of legacy servers•Leverage COM objects as operators7/16/98ARPA Active Nets12TopGun Wingman/Mediaboard•Eric’s slide is in PDF7/16/98ARPA Active Nets13Campus-wide Testbed (Millennium)Gigabit EthernetPDAsCell PhonesFuture DevicesWirelessInfrastructure7/16/98ARPA Active Nets14Milestones•Year 1–Architecture Definition, Operator/Connector Type System, Active Message-based Active Net–Technology: PIM proto. With COTS database, Auto connection, NOW Base, Test Units•Year 2–WAP with intermittent connectivity, execution environment for Base, AR, Unit–Technology: COM integration, shared link mgmt, multicast connectors, Type hierarchy–Working testbed, PIM prototype•Year 3–WAP transformation, operator migration, large-scale agents–FSM-based fast operators, operator fusion, migration–Full testbed, smart-space, PIM


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