Tranquility: A Low Disruptive Alternative to Quiescence for Ensuring Safe Dynamic Updates

  • Authors:
  • Yves Vandewoude;Peter Ebraert;Yolande Berbers;Theo D'Hondt

  • Affiliations:
  • -;-;-;-

  • Venue:
  • IEEE Transactions on Software Engineering
  • Year:
  • 2007

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Abstract

This paper revisits a problem that was identified by Kramer and Magee: placing a system in a consistent state before and after runtime changes. We show that their notion of quiescence as a necessary and sufficient condition for safe runtime changes is too strict and results in a significant disruption in the application being updated. In this paper, we introduce a weaker condition: tranquility. We show that tranquility is easier to obtain and less disruptive for the running application but still a sufficient condition to ensure application consistency. We present an implementation of our approach on a component middleware platform and experimentally verify the validity and practical applicability of our approach using data retrieved from a case study.