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

Abstract

SUMMARY 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.

A Service Oriented Architecture for achieving QoSaware Workflow Management in Virtualized Environments

“…Users are able to specify high-level constraints and properties centered on execution time and the workflow is scheduled based on performance prediction. In the Amadeus environment [15] QoS parameters concerning time and cost are supported and performance prediction is carried out in order to find the optimal resource, while also provisioning SLAs between the user and the provider of the service. The GrADS project [16] is based on the Globus Toolkit (GT) [17] and it aims at applications with large computational and communication load.…”

Service mediation and negotiation bootstrapping as first achievements towards self-adaptable grid and cloud services

“…Usually, before service usage, service consumer and service provider have to establish an electronic contract defining terms of use [6,11]. Thus, they have to negotiate the exact terms of contract (e.g., exact execution time of the service).…”

Special Issue: Fourth International Workshop on Workflow Management (ICWM2009)

“…Many research and development efforts have been made in the field of workflow management and applications in distributed computing environments such as [2][3][4][5][6][7][8][12][13][14][15][16][17][18][19][20][21]. More and more people from different areas are trying to facilitate the techniques from their respective areas to tackle tough issues in workflow management in general such as resource scheduling, computation reduction and semantic/knowledge management issues.…”