1 / 18

www.gridminer.org … Intelligent Grid Solutions

Convergence of Grid and Web technologies

Alexander Wöhrer und Peter BrezanyInstitute for Software Sciencewoehrer@par.univie.ac.at

2

www.gridminer.org

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

3

www.gridminer.org

Grid World: OGSA/OGSI/GT3• GT3 implemented OGSI

• GT4 implements WSRF

We need a „stable“ infrastructure!

4

www.gridminer.org

Web Services & Grid Requirements

Web Services

Business integration

Secure and universal access

Applications on demand

Grid Protocols

Vast resourcescalability

Global Accessibility

Resourceson demand

access manageshare

5

www.gridminer.org

Convergence of Web/Grid Services

WSRF should be the common base for both „worlds“!

6

www.gridminer.org

WSRF: Why? The main criticisms about OGSI:

Too much stuff in one specification=> 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

7

www.gridminer.org

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

8

www.gridminer.org

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

9

www.gridminer.org

GT4 Components

10

www.gridminer.org

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

11

www.gridminer.org

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

12

www.gridminer.org

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

13

www.gridminer.org

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

14

www.gridminer.org

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.

15

www.gridminer.org

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

16

www.gridminer.org

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

17

www.gridminer.org

Conclusions

Direction towards „Web Services“ Grids

Things are changing constantly

Infrastructure to built on is an important decision

18

www.gridminer.org

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/