Grids - the near future Mark Hayes NIEeS Summer School 2003.

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Presentation transcript:

Grids - the near future Mark Hayes NIEeS Summer School 2003

Web services A web service is a network-accessible application identified by a URI e.g. with an interface defined in terms of XML based messages these messages transported by internet protocols (usually HTTP) The application & its interface definition should be ‘discoverable’ by other applications independent of OS platform & programming language. W3C standards body:

Acronym soup XML - eXtensible Markup Language XSLT - eXtensible Stylesheet Language Transformations SOAP - Simple Object Access Protocol WSDL- Web Service Description Language UDDI - Universal Description, Discovery & Integration protocol BPEL - Business Process Execution Language WSIF - Web Services Invocation Framework …..

terraservice.net Web service interface to Example app: US Department of Agriculture have a database of soil properties, ‘federated’ with terraservice.net to provide geographical & topographic detail.

Grid services An extension of web services to provide for the dynamic creation (and destruction) of service instances. Why is this useful? Consider submitting a job… OGSA: Open Grid Services Architecture builds on... OGSI: Open Grid Services Infrastructure GGF standards body: OGSI specification now in GGF comments period. The community develops OGSA services.

Database Access & Integration OGSA services for federation of XML & relational databases.

Globus Toolkit v3 A re-implementation based on OGSI, though many services are wrappers around GT2 implementation. “Production” release just out: June 30th. Intended backwards compatibility with GT2.

The UK Grid in the next year GT2 based Grid will continue for at least the next year. In parallel, GT3 evaluation & experimental Grid On-going efforts to produce documentation, improve resource management & accounting, a user group…

UK eScience - future plans Digital curation centre - software development, best practices Open Middleware Institute - repository & software engineering of UK grown middleware More applications!