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EMIR: An EMI Service Registry for Federated Grid Infrastructures
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This paper compares three multi-national research infrastructures, one that provides data services, one that provides compute services, and one that supports linguistics research. The aim is to jointly provide services to the user communities, and, perhaps eventually, seamlessly interoperate. To this end, we look at and compare how the infrastructures build their service federations (trust, service status, information systems), and how they manage users (identities, authentication, and authorisation).
All grid projects have to deal with topology and operational information like resource distribution, contact lists and downtime declarations. Storing, maintaining and publishing this information properly is one of the key elements to successful grid operations. The solution adopted by EGEE and WLCG projects is a central repository that hosts this information and makes it available to users and client tools. This repository, known as GOCDB, is used through EGEE and WLCG as an authoritative primary source of information for operations, monitoring, accounting and reporting. After giving a short history of GOCDB, the paper describes the current architecture of the tool and gives an overview of its well established development workflows and release procedures. It also presents different collaboration use cases with other EGEE operations tools and deals with the High Availability mechanism put in place to address failover and replication issues. It describes ongoing work on providing web services interfaces and gives examples of integration with other grid projects, such as the NGS in the UK. The paper finally presents our vision of GOCDB's future and associated plans to base its architecture on a pseudo object database model, allowing for its distribution across the 11 EGEE regions. This will be one of the most challenging works to achieve during the third phase of EGEE in order to prepare for a sustainable European Grid Infrastructure.
Developing, maintaining and accessing complex information repositories are some of the main concerns of todaypsilas information society. In huge distributed systems, guaranteeing good performances and data integrity is a real challenge when using standard relational databases. This paper presents a database concept methodology that addresses these concerns under the form of an ldquoRDBMS independentrdquo database designed in an object fashion, while allowing for standard SQL access for those applications that require it. After presenting the general concept and model and showing that it can be used and implemented on any database system, we will describe it in detail and focus on examples of current uses both for commercial and academic applications. The paper will highlight the benefits of using this model in one particular highly complex, distributed database environment in describing its application to the central authoritative information repository of the EGEE and WLCG worldwide computing Grids.
The World Wide Web has succeeded in large part because its software architecture has been designed to meet the needs of an Internet-scale distributed hypermedia application. The modern Web architecture emphasizes scalability of component interactions, generality of interfaces, independent deployment of components, and intermediary components to reduce interaction latency, enforce security, and encapsulate legacy systems. In this article we introduce the Representational State Transfer (REST) architectural style, developed as an abstract model of the Web architecture and used to guide our redesign and definition of the Hypertext Transfer Protocol and Uniform Resource Identifiers. We describe the software engineering principles guiding REST and the interaction constraints chosen to retain those principles, contrasting them to the constraints of other architectural styles. We then compare the abstract model to the currently deployed Web architecture in order to elicit mismatches between the existing protocols and the applications they are intended to support.
Web Services Service Group Specification v1.2, OASIS 06
- Tom Maguire
- David Snelling
- Tim Banks
Tom Maguire, David Snelling, Tim Banks, Web Services Service Group Specification v1.2, OASIS 06,
[wsrf-ws-service-group-1.2-spec-os]
GLUE Specification 2.0, OGF 09
- Sergio Andreozzi
- Stephen Burke
- Felix Ehm
- Laurence Field
- Gerson Galang
- Balazs Konya
- Maarten Litmaath
- Paul Millar
- J P Navarro
Sergio Andreozzi, Stephen Burke, Felix Ehm, Laurence Field, Gerson Galang, Balazs Konya,
Maarten Litmaath, Paul Millar, JP Navarro, GLUE Specification 2.0, OGF 09, [GFD-R-P.147]