Open Grid Services Architecture: Difference between revisions

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{{primary sources|date=September 2011}}

'''Open Grid Services Architecture''' ('''OGSA''') describes an architecture for a [[Serviceservice-oriented architecture|service-oriented]] for a [[grid computing]] environment for business and scientific use, developed within the [[Global Grid Forum]] (GGF). OGSA is based on several other [[Web service]] technologies, notably [[Web Services Description Language|WSDL]] and [[Simple Object Access Protocol|SOAP]], but it aims to be largely agnostic in relation to the transport-level handling of data.

It was developed within the [[Open Grid Forum]], which was called the Global Grid Forum (GGF) at the time.

==Description==

Briefly, OGSA is a distributed interaction and computing architecture based around services, assuring interoperability on heterogeneous systems so that different types of resources can communicate and share information. OGSA has been described as a refinement of the emerging Web Services architecture, specifically designed to support Grid requirements.<ref>[http://www.nesc.ac.uk/teams/OGSAanalysisDennisGannon.pdf An Analysis of The Open Grid Services Architecture]</ref> OGSA has been adopted as a grid architecture by a number of grid projects including the [[Globus Alliance]]. Conceptually, OGSA was first suggested in a seminal paper by [[Ian Foster]] called "The Physiology of the Grid", and later developed by [[Global Grid Forum|GGF]] working groups which resulted in a GGF information document, entitled ''The Open Grid Services Architecture, Version 1.5''.<ref>[http://www.ogf.org/documents/GFD.80.pdf The Open Grid Services Architecture, Version 1.5]</ref> The [[Global Grid Forum]] continues to track Tier 1 use case scenarios used in the definition of the OGSA core services.<ref>[http://www.ogf.org/documents/GFD.29.pdf OGSA Tier 1 Use Case Draft Document]</ref>

OGSA is a distributed interaction and computing architecture based around services, assuring interoperability on heterogeneous systems so that different types of resources can communicate and share information. OGSA is based on several other [[Web service]] technologies, such as the [[Web Services Description Language]] (WSDL) and the [[Simple Object Access Protocol]] (SOAP), but it aims to be largely independent of transport-level handling of data.

Briefly, OGSA is a distributed interaction and computing architecture based around services, assuring interoperability on heterogeneous systems so that different types of resources can communicate and share information. OGSA has been described as a refinement of the emerging Web Services architecture, specifically designed to support Grid requirements.<ref>[http://www.nesc.ac.uk/teams/OGSAanalysisDennisGannon.pdf An Analysis of The Open Grid Services Architecture]</ref> OGSA has been adopted as a grid architecture by a number of grid projects including the [[Globus Alliance]]. Conceptually, OGSA was first suggested in a seminal paper by [[Ian Foster]] called "The Physiology of the Grid", and later developed by [[Global Grid Forum|GGF]] working groups which resulted in a GGF information document, entitled ''The Open Grid Services Architecture, Version 1.5''.<ref>[http://www.ogf.org/documents/GFD.80.pdf The Open Grid Services Architecture, Version 1.5]</ref> The [[Global Grid Forum]] continues to track Tier 1 use case scenarios used in the definition of the OGSA core services.<ref>[http://www.ogf.org/documents/GFD.29.pdf OGSA Tier 1 Use Case Draft Document]</ref>

==Features==

According to the "Defining the Grid: A Roadmap for OGSA Standards v 1.0", OGSA is:<ref>[http://www.ogf.org/documents/GFD.53.pdf Defining the Grid: A Roadmap for OGSA Standards v 1.0]</ref>

* An architectural process in which the GGF's OGSA Working Group collects requirements and maintains a set of informational documents that describe the architecture;

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* Software components that adhere to the OGSA specifications and profiles, enabling deployment of grid solutions that are interoperable even though they may be based on implementations from multiple sources.

"The Open Grid Services Architecture, Version 1.5" describesdescribed an OGSA grid in terms of the following capabilities:<ref>[http://www.ogf.org/documents/GFD.80.pdf The Open Grid Services Architecture, Version 1.5]</ref>

* Infrastructure services

* Execution Management services

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* Information services

{{As of|2006|alt=As ofIn late 2006}} an updated version of the OGSA Architecture document and several associated documents have beenwere published, including the first of several planned normative documents, "Open Grid Services Architecture Glossary of Terms, Version 1.5".<ref>[http://www.ogf.org/documents/GFD.81.pdf Open Grid Services Architecture Glossary of Terms, Version 1.5]</ref> Development of conformant software is expected to follow rapidly once a critical mass of normative documents have been published.

The concept of OGSA is derived from work presented in the paper "The Physiology of the Grid" by [[Ian Foster]], [[Carl Kesselman]], Jeffrey M. Nick, and Steven Tuecke.<ref>[http://www.globus.org/alliance/publications/papers/ogsa.pdf The Physiology of the Grid]</ref>

The [[Open Grid Services Infrastructure]] (OGSI) is related to OGSA, as it was originally intended to form the basic “plumbing” layer for OGSA. It has beenwas superseded by [[Web Services Resource Framework|WSRF]] (WSRF) and [[WS-Management]].

==References==