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Workflow in Grid Systems Workshop

Workflow in Grid Systems Workshop. Dave Berry, Research Manager UK National e-Science Centre GGF10, Mar 2004. Outline: Welcome. Welcome Aims Programme “E-Science Workflow Services” Background Structure Issues arising. Aims. Report on current work Find areas of agreement

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Workflow in Grid Systems Workshop

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  1. Workflow in Grid Systems Workshop Dave Berry, Research Manager UK National e-Science Centre GGF10, Mar 2004

  2. Outline: Welcome • Welcome • Aims • Programme • “E-Science Workflow Services” • Background • Structure • Issues arising

  3. Aims • Report on current work • Find areas of agreement • Identify open issues • Look for opportunities • Research • Development • Collaboration • Outcomes • Sample workflows • CP&E special issue • Input to RGs and WGs ?

  4. Morning Session • Talks • Architecture • Applications • Possible panel topics: • Scripting • Security • Debugging • Constraint Modelling • Discussion • Issues

  5. Afternoon session • Talks • Languages (esp. BPEL) • Tools & Enactment • Possible panel topics: • Adaptive enactment • Workflow inference • Event-driven enactment • Incorporating devices & human input • Discussion • Outcomes

  6. Outline:“E-Science Workflow Services” • Welcome • Aims • Programme • “E-Science Workflow Services” • Background • Structure • Issues arising

  7. E-Science Workflow Services • > 90 participants • Industry • UK e-Science • International e-Science • Organisers • Dave Berry (NeSC) • Savas Parastatidis (NEReSC) • Written report • In progress • UK e-Science Series December 3-5, 2003

  8. e-Science Institute e-Science Institute

  9. Speakers • Industry • WfMC, WS-Choreography • UK e-Science • MyGrid/Taverna, GeoDise, DiscoveryNet, DAME, ICENI, Planning, RealityGrid, JIGSA, OGSA-DAI, Triana, AstroGrid • International e-Science • Chimera/Pegasus, BIRN, Kepler/Ptolemy, Thetis, Narada • Research • Operational research, Workflow and VO’s

  10. Breakout Sessions • Scientific Workflow Requirements • Carole Goble • Protocols in Scientific Workflows • John Brooke • Workflow Languages and Engines • Matthew Addis

  11. User requirements • Reflect the modelling paradigm of the scientist. • Varies between experiments, disciplines • Which user would that be? • Creators, users, auditors, validators (I know if its right when I see it) • Biologists cf. bioinformaticians, and transitioning between • Different users, different environments • Appropriate levels of abstraction. • User models -> workflow models • Simple to use & intuitive creation, deployment, execution and debugging environments

  12. A Scientist Writes… “Work in my problem solving environment so that I don’t need to change the way I work.”

  13. Scientific Workflow lifecycles • Incrementally exploratory prototypes • Got the data, now get the Nature paper before the next guy • Large scale production • Got the idea, now get the data for many experiments, teams, communities • Migration from one to the other • Capture of prototype for later non-interactive replay in a parameterised fashion • Different parts of the lifecycle • May use different environments and policies • Different sorts of users will interact

  14. User interaction • Creation & Discovery • By example, plagiarism, drag and drop • Collaborative multi-user interaction in creation • Reusing workflows -> modularisation • Reusing workflows with different parameters and data • Composing workflows from different areas, disciplines and scales • “eXtreme team workflow creation” • Single User interaction with workflow execution • Choice between paths of execution in specific states • Parameter modification mid-run • Collaborative multi-user interaction during execution?

  15. Characterising Scientific Workflows • Very large amounts of data • Files, streams, database queries • GridFTP, http, ftp, sockets … • Sometimes it's the computation that needs to be moved to the data • Data model and types • Metadata • Provenance • Drivers • Scientific questions, outcomes and vanity • More creators than users in science?

  16. Enactment Stack

  17. Workflow vs. Service “Perform” document Result of query 1 Stored procedure OGSA-DAI Service Transformed result of query 2

  18. Questions? daveb@nesc.ac.uk Presentations from the workshop: http://www.nesc.ac.uk/action/esi/contribution.cfm?Title=303

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