Sharing Workflows

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Sharing Workflows

• Omer Rana
• Cardiff University
• o.f.rana_at_cs.cardiff.ac.uk

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Workflow ( Enactment)
From Aleksander Slominski
Description
Launch, configure And control
Orchestration Service
Workflow Engine
Workflow Instance
Workflow Instance
Workflow Instance
Resource layer 1000s of PCs -gtmassive
supercomputers and data sources
Network
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Incentives

• Semantic annotations of services
• UDDI too limited (TModel and CategoryBag)
• Seek alternative service
• Sharing of common interfaces
• Composition S1 x S2 x S3 x Sn
• x (sequence, parallel, map, etc)
• Sharing ? Alternative Decompositions
• C1 S1 x S2 x S3 (workflow re-writing)
• C1 S1 x (S4 x S5) x S3
• Eg. Look for a service tan(x)
• Look for a services sin(x) and cos(x)

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What can be shared?

• Abstract (design time) workflow
• Task graph encoding data flow or control flow
  dependencies
• Concrete (run time) workflow
• Service bindings to an abstract workflow graph
• Sharing of graph structures, rather than just
  services
• Limited case composite services

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KNOOGLE (OMII UK)

• Matchmaker shell that can support
• Match plug-ins
• Selection policy
• Registry service (GRIMOIRES)
• Matchmaker based
• Syntax or context-based
• Can identify match modes/scores
• Selection Policy
• Choice between returned services (policy)

• Available from
• OMII UK
• Command line based
• Or with Taverna 1.4.1

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Re-enacting workflow

• Run-time concrete workflow sharing
• Understand
• What happened when workflow was executed
• What services were used and the type of I/O
  (interactions) involved
• Use recorded provenance (history) information
  as a means to reconstruct workflow

The provenance of a piece of data is the process
that led to that piece of data
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Provenance architecture (EU Provenance)
Service A (actor 2)
Application
Client (actor 1)
Service B (actor 3)
User
Provenance Store
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p-assertion

• A given element of process documentation referred
  to as a p-assertion
• p-assertion is an assertion that is made by an
  actor and pertains to a process.
• Types
• Interaction p-assertion
• relates to content of received/sent message
• Actor State p-assertion
• State of an actor
• Relationship p-assertion
• Relationships between interaction
• p-assertions

From Luc Moreau (U Southampton)
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Implementation Diagram
From Luc Moreau (U Southampton)
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Portal OTM Application
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Portal OTM Application
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Portal EHCR Application
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Portal DLR Application
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Portal Management
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Provenance Analysis Tool (JESS Rule Engine)
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Thanks to

• Julian Padget and Bill Naylor, Bath University
  Knoogle team
• Subodh Vaid, Neil Chapman and Tom Goodale,
  Cardiff Knoogle team
• Arnaud Contes, Vikas Deora, and the EU Provenance
  team (http//www.gridprovenance.org/)