Highly reliable upgrading of components
Cook, J.E.
Dage, J.A.
Dept. of Comput. Sci., New Mexico State Univ., Las Cruces, NM, USA;
This paper appears in: Software Engineering, 1999. Proceedings of the 1999 International Conference on
Publication Date: 22-22 May 1999
On page(s): 203-212
Meeting Date: 05/16/1999 - 05/22/1999
Location: Los Angeles, CA, USA, USA
ISSN: 0270-5257
ISBN: 1-58113-074-0
References Cited: 42
INSPEC Accession Number: 6528356
Current Version Published: 2002-08-06
Abstract
After a system is deployed, fixes, enhancements, and modifications all occur that change the components that make up the system. Unfortunately, new versions of components can introduce new errors and break existing, depended-upon behavior. When this happens, the old component version could have provided the correct behavior, but it is no longer part of the system. We propose a framework, HERCULES, for upgrading system components that, instead of removing the old version of the component, keeps multiple versions of a component running. Doing so allows behavior to be utilized from all versions, and maintains system integrity and correctness even in the presence of newly introduced errors. This framework ensures that the move towards dynamic, configurable software systems does not lessen, but rather provides capabilities to enhance the reliability that software will achieve through the next century.
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