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

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4 Author(s)
Vandewoude, Y. ; Katholieke Univ. Leuven, Heverlee ; Ebraert, P. ; Berbers, Y. ; D'Hondt, T.

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: tranquillity. We show that tranquillity 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.

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Software Engineering, IEEE Transactions on  (Volume:33 ,  Issue: 12 )