Convergence of Grid and Web technologies

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Convergence of Grid and Web technologies

• Alexander Wöhrer und Peter Brezany
• Institute for Software Science
• woehrer_at_par.univie.ac.at

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Agenda

• Introduction
• OGSA/OGSI
• Globus Toolkit 3
• WSRF
• Why it was developed?
• What is it?
• Reference implementation Globus Toolkit 4
• Alternatives?
• WS-I
• OMII WS-I
• Conclusion

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Grid World OGSA/OGSI/GT3

• GT3 implemented OGSI
• GT4 implements WSRF
• We need a stable infrastructure!

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Web Services Grid Requirements
manage
share
access
Resources on demand
Applications on demand
Global Accessibility
Secure and universal access
Business integration
Vast resource scalability
Grid Protocols
Web Services
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Convergence of Web/Grid Services
WSRF should be the common base for both worlds!
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WSRF Why?

• The main criticisms about OGSI
• Too much stuff in one specification
• gt functionality partitioned into a family of
  composable specifications
• Does not work well with existing Web services
  tooling
• Too object oriented
• Additionally
• To have an architecture that is more clearly
  aligned with the general evolution of Web
  services
• To provide a collection of related specifications
  that can be used either individually or in
  combinations
• . and will integrate more effectively with
  other Web services standards
• To more closely align with existing language and
  platform programming models and application
  development tools

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WSRF What?

• announced at GlobusWorld 04 by
• Globus Alliance
• IBM and HP
• Now under the controll of OASIS (ebXML, UDDI
  2,...)
• refactoring of the concepts and interfaces
  developed in OGSI
• specify how to use Web services to access
  stateful components
• Set of four Specs
• WS-ResourceProperties
• WS-ResourceLifetime
• WS-ServiceGroup
• WS-BaseFaults
• WS-Notification specifications built on them

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GT4 Facts

• Web services developed with GT4 can be configured
  to be compatible with WS-I Basic Profile
• All GT4 Web service interfaces will be WS-I
  compliant
• Will support WSRF/WSN
• Releases
• Beta Mid December
• Final 31. Jan. 2005

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GT4 Components
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WS-I

• An open industry effort chartered to promote Web
  Services interoperability across platforms,
  applications and programming languages.
• A standards integrator to help Web services
  advance in a structured, coherent manner
• Approximately 130 member organizations

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WS-I Deliverables

• Profiles
• Defined set of specifications or standards at
  specific version levels
• Guidelines and conventions for using these
  specifications together in ways that ensure
  interoperability
• Sample applications
• Use cases and usage scenarios based on customer
  requirements
• Sample code and applications built in multiple
  environments
• Demonstrate profile-based interoperability
• Test tools and supporting materials
• Tools that test profile implementations for
  conformance with the profiles
• Supporting documentation and white papers

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WS-I Base Profile 1.0

• Consists of
• SOAP 1.1
• WSDL 1.1
• UDDI 2.0
• XML 1.0
• XML Schema
• HTTP 1.1
• Coming soon
• Attachments
• support for interoperable SOAP Messages with
  Attachments-based Web services
• Security Profile

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Open MiddlewareInfrastructure Institute (OMII)

• Task The source of open source grid software
  (for the UK)
• Based at the University of Southampton
• Utilise existing software and standards
• e.g. OGSA-DAI part of it
• Production focused software development
• Integrate, test document a product
• Reduce the time spent by applied researchers at
  having to be computer scientists

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OMII Web Service Grids WS-I

• Baseline from WS-I profiles
• Specifications that are very low risk
• Completed standardisation process (stable)
• Growing community adoption
• Interoperable commercial implementations
  (tooling)
• WS-I track specifications
• Specifications added to profile as they mature
• e.g. WS-RF
• This is not a static set and will evolve over
  time.

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OMII WS-I Current Status

• Core Architecture WS-I
• Discovery
• UDDI (examining the role of Semantic meta-data)
• Workflow
• BPEL
• Messaging
• WS-RM (Minimal differences from WS-R)
• Addressing
• WS-A
• Notification No clear solution

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OMII Release Schedule

• OMII 1.0 December 2004
• a collection of tested, documented and integrated
  software components that provides a standard
  platform
• OMII 1.1 January 2005
• OMII 2.0 April 2005

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Conclusions

• Direction
• towards Web Services Grids
• Things are changing constantly
• Infrastructure to built on is an important
  decision

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Resources

• WS-I
• http//www.omii.ac.uk/paper_web_service_grids.pdf
  
• WS-I
• http//www.ws-i.org/
• OASIS
• http//www.oasis-open.org/
• OMII
• http//www.omii.ac.uk/
• WSRF
• http//www.globus.org/wsrf/
• Globus Toolkit
• http//www.globus.org/toolkit/