Specification, planning, and execution of QoS-aware Grid workflows within the Amadeus environment

Authors:
Ivona Brandic;Sabri Pllana;Siegfried Benkner
Affiliations:
Institute of Scientific Computing, University of Vienna, Nordbergstraße 15, 1090 Vienna, Austria;Institute of Scientific Computing, University of Vienna, Nordbergstraße 15, 1090 Vienna, Austria;Institute of Scientific Computing, University of Vienna, Nordbergstraße 15, 1090 Vienna, Austria
Venue:
Concurrency and Computation: Practice & Experience - First International Workshop on Workflow Systems in Grid Environments (WSGE2006)
Year:
2008

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Abstract

Commonly, at a high level of abstraction Grid applications are specified based on the workflow paradigm. However, majority of Grid workflow systems either do not support Quality of Service (QoS), or provide only partial QoS support for certain phases of the workflow lifecycle. In this paper we present Amadeus, which is a holistic service-oriented environment for QoS-aware Grid workflows. Amadeus considers user requirements, in terms of QoS constraints, during workflow specification, planning, and execution. Within the Amadeus environment workflows and the associated QoS constraints are specified at a high level using an intuitive graphical notation. A distinguishing feature of our system is the support of a comprehensive set of QoS requirements, which considers in addition to performance and economical aspects also legal and security aspects. A set of QoS-aware service-oriented components is provided for workflow planning to support automatic constraint-based service negotiation and workflow optimization. For improving the efficiency of workflow planning we introduce a QoS-aware workflow reduction technique. Furthermore, we present our static and dynamic planning strategies for workflow execution in accordance with user-specified requirements. For each phase of the workflow lifecycle we experimentally evaluate the corresponding Amadeus components. Copyright © 2007 John Wiley & Sons, Ltd.