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Necessary and sufficient checkpoint selection for temporal verification of high-confidence cloud workflow systems

Science China(Information Sciences) 2015年第5期58卷 33-48页

作者： WANG FuTian LIU Xiao YANG Yun School of Computer Science and Technology Anhui University Shanghai Key Laboratory of Trustworthy Computing East China Normal University School of Software and Electrical Engineering Swinburne University of Technology

On-time completion is an important temporal Qo S(quality of service) dimension and one of the fundamental requirements for high-confidence workflow systems. In recent years, a workflow temporal verification framework, which generally consists of temporal constraint setting, temporal checkpoint selection, temporal verification, and temporal violation handling, has been the major approach for the high temporal Qo S assurance of workflow systems. Among them, effective temporal checkpoint selection, which aims to timely detect intermediate temporal violations along workflow execution plays a critical role. Therefore, temporal checkpoint selection has been a major topic and has attracted significant efforts. In this paper, we will present an overview of workflow temporal checkpoint selection for temporal verification. Specifically, we will first introduce the throughput based and response-time based temporal consistency models for business and scientific cloud workflow systems,respectively. Then the corresponding benchmarking checkpoint selection strategies that satisfy the property of"necessity and sufficiency" are presented. We also provide experimental results to demonstrate the effectiveness of our checkpoint selection strategies, and finally points out some possible future issues in this research area.

关键词： workflow system workflow temporal verification temporal checkpoint selection business workflow scientific workflow quality of se

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