Stepwise and asynchronous runtime optimization of web service compositions

Authors:
Philipp Leitner;Waldemar Hummer;Benjamin Satzger;Schahram Dustdar
Affiliations:
Distributed Systems Group, Vienna University of Technology, Vienna, Austria;Distributed Systems Group, Vienna University of Technology, Vienna, Austria;Distributed Systems Group, Vienna University of Technology, Vienna, Austria;Distributed Systems Group, Vienna University of Technology, Vienna, Austria
Venue:
WISE'11 Proceedings of the 12th international conference on Web information system engineering
Year:
2011

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Abstract

Existing research work considers runtime adaptation of service compositions as a viable tool to prevent violations of service level agreements. In previous work we have formalized the optimization problem of identifying the most suitable adaptations to prevent a predicted set of violations, and presented suitable algorithms to solve this problem. Here, we introduce the idea of stepwise optimization as a solution to the problem of how to deal with situations when the optimization result is not available in time, i.e., when decisions need to be taken before the optimization problem can be fully solved.