Highly reliable upgrading of components
Cook, J.E.; Dage, J.A.
Software Engineering, 1999. Proceedings of the 1999 International Conference on
Volume , Issue , 1999 Page(s):203 - 212
Digital Object Identifier 10.1109/ICSE.1999.841010
Summary: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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