ProActive Infrastructure
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ProActive Infrastructure Eric Brewer, David Culler, Anthony Joseph, Randy Katz Computer Science Division U.C. Berkeley ninja.cs.berkeley.edu Active Networks Workshop, July 1998
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ProActive Infrastructure. Eric Brewer, David Culler, Anthony Joseph , Randy Katz Computer Science Division U.C. Berkeley ninja.cs.berkeley.edu Active Networks Workshop, July 1998. Your PDA connects to the local infrastructure and asks it to build a custom GUI. - PowerPoint PPT Presentation
Transcript of ProActive Infrastructure
ProActive Infrastructure
Eric Brewer, David Culler,
Anthony Joseph, Randy Katz
Computer Science Division
U.C. Berkeley
ninja.cs.berkeley.edu
Active Networks Workshop, July 1998
7/16/98 ARPA Active Nets 2
Imagine
• You walk into a room
You have complete, secure, optimized access to local devices and your private resources
• Your PDA connects to the local infrastructure and asks it to build a custom GUI
• Next, your PDA then asks the infrastructure for a path out to your personal information space, where agents are processing your e-mail, v-mail, faxes, and pages
7/16/98 ARPA Active Nets 3
Vision Goal
• The next internet revolution will come from enabling component services and pervasive access
Dynamic, programmatic creation / composition of scalable, highly available, & customizable services
– Automatic adaptation to end device characteristics and network connectivity
• Arbitrarily powerful services on arbitrarily small clients using a proactive infrastructure
7/16/98 ARPA Active Nets 4
Starting Point: Transcoding Proxies
Scalable Servers
Laptops, Desktops
Info. AppliancesNetwork Computers
Spoon feed web pages to PDAs
Transformation, Aggregation, Caching, and Customization (TACC) Scalability and availability Limited customizability and locality and no persistence
Legacy Servers
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ProActive Approach
• Create a framework that enables programmatic 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 + capsules
» TACC + persistence + customization
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• Bases– highly available– persistent state (safe)– databases, agents– “home” base per user– service programming environment
Structured Architecture
• Active Routers– not packet routers – soft-state– well-connected– localization (any to any)
• Units– sensors / actuators– PDAs / smartphones / PCs– heterogeneous– Minimal functionality: “Smart Clients”
Wide-Area Path
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Operators/Connectors
Operators:– transformation– aggregation– agents
– PI provides secure execution environment
Connectors:– abstract wires
– ADUs
– varying semantics
– uni/multicast
Interfaces:– strongly typed
– language independent
– control channel» path changes» authentication» feedback
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Wide-Area Paths
• Creation (explicit or automatic):– Query Service Discovery Service to find logical path of operators
– Place operators onto nodes:
» Path is unit of resource allocation and authentication
– Connectors are polymorphic: entire path must type check - statically
• Optimization:– Add (or transpose) operators
» forward error-correction
» compression/decompression
– Change operators, connectors, locations, or parameters
• Interoperability:– Wrapper operators for legacy servers
– Leverage COM objects as operators
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Service request
service threads
OperatorsCaches
PersistentStorage
Managed RMI++
Physicalprocessor
iSpace Execution Environment
• iSpace provides parallel application framework on Bases– RMI++ hides complexity of scalability and availability
– Dynamic customization and composition
• rSpace is limited execution environment for AR
operatorupload
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Pilot PDA: TopGun Wingman / Mediaboard
AR
mic camera
Base
AR
PDA
LegacyServer
PCUn-Zip
Image Converter
AggregatorMulticast connector
MediaBoard
PDA Proxy
• Wingman: Pilot Web browser• Mediaboard: Pilot Mbone tool
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Campus-wide Testbed (Millennium)
Gigabit Ethernet
PDAs Cell PhonesFuture Devices
WirelessInfrastructure
DesktopPCs
Servers
Clusters
Massive Cluster
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Milestones
• Year 1– Architecture definition, Operator/Connector type system,
Active Message-based Active Net
– Technology: PIM prototype with COTS database, Automatic connection, NOW as Base
• Year 2– Wide-Area Paths 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– Wide-Area Path transformation, operator migration, large-scale agents
– FSM-based fast operators, operator fusion
– Full testbed, smart-space, PIM release
ProActive Infrastructure
Eric Brewer, David Culler,
Anthony Joseph, Randy Katz
Computer Science Division
U.C. Berkeley
ninja.cs.berkeley.edu
Active Networks Workshop, July 1998
