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10 Sep 2005 NVO Summer School 20051 Managing VO data and process flows Matthew J. Graham CACR/Caltech T HE US N ATIONAL V IRTUAL O BSERVATORY.

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Presentation on theme: "10 Sep 2005 NVO Summer School 20051 Managing VO data and process flows Matthew J. Graham CACR/Caltech T HE US N ATIONAL V IRTUAL O BSERVATORY."— Presentation transcript:

1 10 Sep 2005 NVO Summer School Managing VO data and process flows Matthew J. Graham CACR/Caltech T HE US N ATIONAL V IRTUAL O BSERVATORY

2 10 Sep 2005 NVO Summer School Overview Astronomical data VOStore/VOSpace Workflows Astrogrid workflow CEA

3 10 Sep 2005 NVO Summer School The importance of data Data is the raison dêtre of the VO LSST is the data source nonpareil –data rates of 540MB/s ~16TB in 8 hrs –final archive > 3PB of data VO Wheel Well-established ways of handling distributed data: – SRB – PVFS – OGSA-DAI

4 10 Sep 2005 NVO Summer School Data use cases Client has data: –stored locally: transfers it to service –stored locally: service retrieves it –stored elsewhere: service retrieves it Service generates data: –stores it locally: notifies client of location –transfers it to the clients local store –transfers it to a client-designated store

5 10 Sep 2005 NVO Summer School VOStore Provides a uniform interface to existing or new data storage locations (Facade pattern) Structured/unstructured data both first level Methods: get put list / listAll importInit importData (sync/async) exportInit exportData (sync/async) delete rename

6 10 Sep 2005 NVO Summer School VOSpace Orchestrates VOStores: –data collections: directories, user-defined –authorisation: user groups –processing efficiency: where is the nearest copy? move copy identifiers

7 10 Sep 2005 NVO Summer School A virtual super-peer data network?

8 10 Sep 2005 NVO Summer School How to manage the flows? Way of describing a flow: –processes/steps, inputs/outputs, serial/parallel execution, control logic, variables, inline scripting –preferably XML (verbose but rigourous) Way of controlling a flow: engine e-Science vs. e-Business: –open-ended vs. closed –verification and publication –static vs. dynamic workflows –volume and type of data –meta-transactions –customer, manager and user vs. scientist

9 10 Sep 2005 NVO Summer School Workflow patterns Sequence: Parallel splitSynchronisatio n AND XORExclusive choiceSimple Merge Multi choice MultiMulti Merge Multi + Synchronizing Merge Multi + Multi Multi + Discriminator Deferred choice Multiple Instances with/out Synch Implicit termination Interleaved Parallel Routing Milestone

10 10 Sep 2005 NVO Summer School Workflow kerfuffle Workflow languages: BPEL (BPEL4WS, WSBPEL, WSFL, XLANG), BPML, WS-CDL (WSCL, WSCI), XPDL, BPSS, PSL, AGWL, DGL, DPML, GJobDL, GSFL, GFDL, GWorkflowDL, MoML, SWFL, YAWL, SCUFL/Xscufl, WPDL, PIF, PSL, OWL-S, xWFL, XPL, INCA Workflow engines: Taverna, Kepler, Pegasus, DiscoveryNet, Triana, SPA, Geodise, ICENI, Askalon, GridNexus, BioPipe, BizTalk, BPWS4J, DAGMan, GridAnt, GJH, GRMS, GWFE, GWES, ITIEE, JIGSA, Karajan, ScyFLOW, SDSC Matrix, SHOP2, wftk, YAWL Engine, WFEE

11 10 Sep 2005 NVO Summer School Astrogrid workflow components JES (Job Execution System) –Astrogrid workflow engine –Manages control flow –Runs steps in a controlled asynchronous fashion CEC (Common Execution Controller) –Manages step execution –Manages data flow CEA (Common Execution Architecture) apps –datacenters: support complex quesries against archives –processing: consume data files and reduce them

12 10 Sep 2005 NVO Summer School Astrogrid workflow schematic PortalRegistryMySpace Command Line CEA Datacenter CEAJES Client library CEC Save/load workflowSave/load data Resolve application Application list Submit workflow

13 10 Sep 2005 NVO Summer School Astrogrid workflow language description of the workflow 21 ${dec} ftp://aServer/myResults … …

14 10 Sep 2005 NVO Summer School CEA Create a uniform interface and model for an application and its parameters Provides higher level description than WSDL: –Restrict how interfaces can be expressed –Provide specific semantics for astronomical quantitites –Extra information, such as default values, GUI labels VOResource extensions for a general application Provide asynchronous operation: –callback, polling and job identification Allow separate data and control flows

15 10 Sep 2005 NVO Summer School Minimum CEA compliance Must implement CommonExecutionConnector interface Must send a message to services implementing ResultsListener interface Should send messages to services implementing JobMonitor interface Should perform basic type checking on all parameter types during init phase


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