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Universal Dynamic Activity Package - Concepts

Universal Dynamic Activity Package - Concepts. A. Anjomshoaa, H. Mersch, A. Memon, M. Memon, Ph. Wieder JSDL Session #3 October 17, 2007 Seattle, WA, USA. Outline. Status Quo Problem Domain Universal Dynamic Activity Package Concept Model Use cases Lessons Learned.

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Universal Dynamic Activity Package - Concepts

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  1. Universal Dynamic Activity Package - Concepts A. Anjomshoaa, H. Mersch, A. Memon, M. Memon, Ph. Wieder JSDL Session #3 October 17, 2007 Seattle, WA, USA (C) 2007 The NextGRID Consortium

  2. Outline • Status Quo • Problem Domain • Universal Dynamic Activity Package • Concept • Model • Use cases • Lessons Learned (C) 2007 The NextGRID Consortium

  3. Activity - Status Quo • Focus is on “Compute Activities” • Client defines Activity using JSDL • Activity is executed on a compute resource • Related OGF specifications • OGSA-BES • JSDL • (GLUE)

  4. Problem Domain - the Activity view • Activity concept is broader than just compute • Think about business scenarios using SLAs • Modelling SLA lifecycle • Creation and Monitoring of SLAs • Evaluation • SLA = “Business Activity” • Comprises compute, but also ... • ... data, accounting info, provenance, lifecycle, etc. • This information has to be captured and related to an activity (C) 2007 The NextGRID Consortium

  5. Problem Domain - the JSDL view JSDL comprises a core Resource Request Language and exists within an environment of other languages like Scheduling Description Language, Job Policy Language, etc. --> more requirements, dependencies, etc. wrt to an Activity (C) 2007 The NextGRID Consortium

  6. UDAP - Activity Definition • Activity: • A unit of work • A job • A task • A data processing operation • A data access operation • An application execution • A Web Service invocation • A “thing” you need to do/take care of/execute! • …etc. • From the OGSA-BES specification: • “…computational entities such as UNIX or Windows processes, Web Services, or parallel programs—what we call activities…” (C) 2007 The NextGRID Consortium

  7. UDAP - Activity Definition • We take a holistic view of an activity • We, therefore, consider ALL that there is to know about an activity: • ALL of its requirements • ALL of its dependencies (on data and other activities) • ALL of its contextual information • Topical domain (financial markets, weather forecasting, etc.) • Security (who owns the activity, who is allowed to run it, etc.) • SLAs, QoS and other related policies • ALL of its monitoring information • Status, history, resource information, accounting, policy conformation etc. (C) 2007 The NextGRID Consortium

  8. UDAP - Activity Definition • An activity is a resource! • It MUST be managed as a resource • It MAY be depended on and used by other activities and resources • Since an activity is a resource, all the knowledge (information) about the activity can be captured and presented as a set of resource properties (C) 2007 The NextGRID Consortium

  9. UDAP Concept • The UDAP package can contain any information about an activity, regardless of the schema used to present that information • The values of the activity information can be updated or appended to reflect the past, present, and future state of the activity • All of the information associated with each activity is contained in a single package • The information in a UDAP package is kept up-to-date for its activity, once it is submitted to and managed within a Grid (C) 2007 The NextGRID Consortium

  10. UDAP Model - Overview • ID and Description • The Record is the core of an Activity • Result is xsd:any (C) 2007 The NextGRID Consortium

  11. UDAP Model - Record (C) 2007 The NextGRID Consortium

  12. UDAP Model & JSDL <UDAP ...> <ActivityID>ID1</ActivityID> <ActivityDescription Dialect=”JSDL">Example using JSDL</ActivityDescription> <Record> <Entry Category="original"> <TimeStamp>2006-05-04T18:13:51.0Z</TimeStamp> <State>pending</State> <Resource> <jsdl:jobDocument> ... </jsdl:jobDocument> </Resource> <Context> <sdl:schedulingPolicy> ... </jsdl:schedulingPolicy> <jpl:somePolicy> ... </jpl:somePolicy> </Context> <Dependency> <wf:someWorkflowDependencies> ... </wf:someWorkflowDependencies> </Dependency> </Entry> </Record> <Result> </Result> </UDAP> (C) 2007 The NextGRID Consortium

  13. UDAP Use Cases • Potentially unlimited number • Job submission (BES!) • Monitor and control state • Accounting • .... • Current NextGRID usage covers • Service/resource discovery • SLA agreement creation (results in Activity instance) • SLA ranking • Uses JSDL, CIM, WS-Resource, ... • Execution not yet integrated (BES?) (C) 2007 The NextGRID Consortium

  14. Lessons Learned • Different definitions of the term “Activity” (co-)exist • JSDL/BES --> compute activity • UDAP --> potentially every activity • Lifecycle of an Activity pretty much determines components needed • Is service discovery part of an Activity? • SLA lifecycle = Activity lifecycle? • “Activity is a WS-Resource” seems to work pretty well (C) 2007 The NextGRID Consortium

  15. Proposal • Follow JSDL approach: clear scope, focus on the schema • Identify components used during activity lifecycle • Make the Activity work a separate group (or design team within JSDL) (C) 2007 The NextGRID Consortium

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