Dynamic Real-time Reconfiguration in Distributed Systems: Timing Issues and Solutions

Authors:
Uwe Brinkschulte;Etienne Schneider;Florentin Picioroaga
Affiliations:
University of Karlsruhe, Germany;University of Karlsruhe, Germany;University of Karlsruhe, Germany
Venue:
ISORC '05 Proceedings of the Eighth IEEE International Symposium on Object-Oriented Real-Time Distributed Computing
Year:
2005

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Abstract

Dynamic software reconfiguration is a useful tool to adapt and maintain software systems. In most approaches, the system has to be stopped while the reconfiguration is in progress. This is not suitable for real-time systems, even on small-embedded systems. Timing constraints must be met even while the system is reconfiguring. Our approach is based on the real-time middleware OSA+. Our main objective is to be able to reconfigure services during run-time, with a predictable and predefined blackout time (the time the systems does not react due to the reconfiguration). Three different approaches concerning the blocking or non-blocking state of a service are presented. These approaches can be used to realize a tradeoff between the reconfiguration time and the blackout time.