Towards a Model Driven Semantic Grid? An update on the Software Services Grid Workshop July 18, 2001 Erick Von Schweber Chief Technology Officer [email protected]

Towards a Model Driven SemanticGrid?

An update on theSoftware Services Grid

WorkshopJuly 18, 2001

Erick Von SchweberChief Technology [email protected]

Presented by Infomaniacs

11.19.2002

Prepared for Raytheon Corp 11.19.2002 Infomaniacs Confidential.

Introduction

Grid technologies are about sharing & collaboration

… a philosophy equally applicable to developing standards and technologies

>>> Establish a grid of concepts and standards between GGF, OMG, and W3C(and potentially others)


Outline

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Part one – the Workshop

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Part one - Workshop Facts of Interest

Held July 10th & 11th 2001 at the OMG Boston TC meeting

Co-organized by Bob Marcus, Erick Von Schweber, Paul Kogut, and Shel Sutton

2 days, 13 presentations, 60 attendees, 17 hours of talks and discussions

Most interesting discovery: reps from one group had no idea of other groups’ efforts related work


Part one – Workshop Presenters

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Sridhar Iyengar, Unisys Fellow & member of the OMG AB

David Frankel, Iona & former member of OMG AB



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Abdul Akram, Sprint & OMG eCommerce Chair

Cory Casanave, EDOC & ebXML, Data Access Technologies

Dan Chang, CWM, IBM



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Reagan Moore, Data Grids, SDSC

Ian Foster, ANL

Wolfgang Gentzsch, Sun Grid Engine, Sun Microsystems



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Hugo Haas, Web Services, W3C

Eric Prud’hommeaux, Semantic Web, W3C

Mark Burstein, DAML, BBN



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OthersPeter Herzum, Federated Business Systems, Vayda & Herzum

Dave Carlson, UML & XML, Ontogenics


Part two - Inputs

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Part two - Inputs

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Evolution of OMA (that gave rise to CORBA)

Goal is unchanged: interoperability with less effort The world has changed: Middleware, regardless of

type or source, will never become a normative element between disparate applications and systems

New Strategy: Raising the level of abstraction

>>> from interfaces to models

Part two – Inputs – Model Driven Architecture



Structural, Functional, & Behavioral models…

expressed in OMG’s UML, XMI, & MOF… across several levels of abstraction… supporting efficient code for distributed,

heterogeneous, target platforms



PIMs, PSMs, & Mappings >> consistency

Billing

Platform Specific Model

Computation IndependentBusiness Model

Platform IndependentModel

Service Provisioning

Platform Specific Model

Computation IndependentBusiness Model

Platform IndependentModel

Image courtesy of Desmond D’Souza ©2001 Kinetium



Portability between heterogeneous platforms

Image courtesy of Desmond D’Souza © 2001 Kinetium


Business Model

Platform Independent

Platform SpecificCORBA

PIM to.NET

Platform Specific.NET

PIM toCORBA



Interoperability by applying formal methodsand/or code generation

Image courtesy of Desmond D’Souza © 2001 Kinetium

Billing

Platform Specific

Business Model



Platform Specific

Business Model


Network



Most new OMG standards areformalized and expressed usingPlatform Independent Model(s),

Platform Specific Model(s)and mappings


Part two - Inputs

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Part two – Inputs - Grids

The Goal of the Grid:

Federated, wide-area computing and scientific infrastructure out of which virtual organizations can form

>>> share computational and non-computational resources and enable collaboration across discrete domains of trust interconnected by wide-area networks


Part two – Inputs - Grids

InternetTransport

Application

Link

Inte

rnet P

roto

col

Arch

itectu

re

Application

Fabric“Controlling things locally”: Access to, & control of, resources

Connectivity“Talking to things”: communication (Internet protocols) & security

Resource“Sharing single resources”: negotiating access, controlling use

Collective“Coordinating multiple resources”: ubiquitous infrastructure services, app-specific distributed services

Image courtesy of Ian Foster

Layered Grid Architecture is analogous to Internet Architecture


Part two – Inputs – GridsGrid standards (a sampling)

GSI (Grid Security Infrastructure) uniform, multi-organizational authentication & authorization with single sign-on

GRAM (Grid Resource Access & Management) remote allocation, reservation, monitoring, and control (moving to SOAP)

GridFTP – extensions for hi-perf data access/transport Grid Information Service

resource registration and information access/monitoring (basis for configuration and adaptation in heterogeneous, dynamic environments)

MDS (Meta Directory Services) custom views on dynamic resource collections assembled by a community


Part two – Inputs – Grids

Globus – Argonne National Labs & UIUC Grid toolkit Legion – Univ. of Virginia object models for Grids Information Power Grid – NASA Grid GRIDS Center – National Middleware Infrastructure Condor-G – Simple workflow management for Grids CoG kits, Punch – Portal access to Grids

Grid Examples (a sampling)


Part two – Inputs – GridsNext Steps:

Need to integrate with tools that address programming, workflow, modeling issues

Ideally, also integrate with other “systems” technologies


Part two - Inputs

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Part two – Inputs – Semantic Web Services

The goal of Web Services:

Do for services (processes) what the web did for content, and more

>>> distributed applications composed at runtime via loose coupling of components, suited for latency-tolerant scenarios


Web Services standards from the outside in

UDDI (Universal Description, Discovery, & Integration) – an index organized by service provider used to find a web service

WSDL (Web Services Description Language) – metadata used to bind to a web service instance at runtime

SOAP (Simple Object Access Protocol) – an XML envelope that can convey an invocation to a web service

Note: all of these are based on syntax




The Goal of the Semantic Web:

Publish, and subsequently discover and compose, web resources based on the meanings of descriptions rather than term strings and syntax

>>> conceptual models of web resources serve as “middleware” between viewpoints, domains, and namespaces



XML NS (Name Spaces)

RDF(s) (Resource Description Framework)

DAML (DARPA Agent Markup Language)

DAML+OIL (Object Inference Language)

DAML-L (Logical Constraint Language)

DAML-S (Service)

XML

Unambiguous reference

Description Graphs

Distributed Ontologies

Description Logic

Logical Constraints

Intelligent Services

Serialization

The Semantic Web stack



Semantic Web + Web Services:

Publishing and subsequently discovering services by what they do, not just how they are invoked, and autonomously composing these to satisfy a conceptually stated request


Part three - the Outputs

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Model Driven Grids

A scalable lifecycle environment for commercial applications• CRM• ERP• EAI• eCommerce• B2B• Telco• Wireless



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Semantic Grids

Hyper-scalable web services• Semantics address pervasive user profiles• Semantics enables coherence across viewpoints• Grid infrastructure delivers performance



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Request Driven Architecture

Consistent, request-driven runtime (re)configurable systems



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Model Driven Semantic GridsRequest-driven scalable computing


Directions – a notional target architecture

Grid Infrastructure

MDA

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Federated Resources and Scalable Execution

Consistent, Distributed Systems of Systems over the Lifecycle

Request-driven Adaptable Systems


Directions – a potential go-forward scenario

GGF should drive scalable, distributed runtime infrastructure

Action Items Manageable, secure, multi-level federations Distributed runtime performance optimization Support for commercial platforms and standards via

MDA in concert with OMG, JCP, Microsoft, and others Unification with W3C Web Services standards and

technologies



OMG should drive consistent, model driven lifecycle architecture

Action Items Platform Specific Models and mappings to Grid

infrastructure developed in concert with GGF MDA and Semantic Web “loosely coupled” via

common models in the short-term “Formal” MDA “tightly coupled” with DAML and its

descendants via common ontologies in the long-term



W3C should drive ubiquitous representations of models and ontologies

Action Items Advance the Semantic Web stack to the edge of

knowledge representation and processing research Unify web services standards and technologies with

GGF Loose and tight couplings with MDA in concert with

OMG


Part four – results as of Q4 2002

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Part four – results as of November 2002

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OMG views grids as a future MDA platformUK eScience program using UML to model Grid and Globus services



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Grid Services: Globus 3.0 will support WSDL interfaces as part of OSGA and OSGI (Open Services Grid Architecture/Infrastructure)

Semantic Grid: under investigation by UK eSciences program



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Formalizing UML 2 infrastructure; OMG Ontology Work groupOMG ORBOS (Orb and Object Services) > MARS (Middleware and Related Services) to incorporate non-Corba middleware, including WS and MoM


Thank You!

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Towards a Model Driven Semantic Grid? An update on the Software Services Grid Workshop July 18, 2001 Erick Von Schweber Chief Technology Officer [email protected]