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A system configuration may be modified at runtime to adapt the system tochanges in its environment or for fine-tuning. For instance, a systemadministrator may change a few entities/attributes in the configuration toimprove error recovery and system availability. However, these changes focusingon fine-tuning availability may violate some global system constraints capturedin the configuration and therefore break configuration consistency, systemproperties and operations. This is generally due to the partialness of thechanges performed by the administrator who is not aware of all theentities/attributes being in relations with the modified entities/attributes.In this paper, we propose an approach for completing such partial sets ofchanges at runtime to resolve inconsistencies arising from those partialchanges. This adjustment approach consists of the characterization of relatedentities/attributes and their modification to re-establish the configurationconsistency. We achieve this by propagating the changes in the configurationaccording to the system constraints following the possible impacts of theconfiguration entities on each other. We aim at minimizing the complementarymodifications to control the side-effects of the change propagation as wetarget the domain of highly available systems.

Resolving inconsistencies of runtime configuration changes through change propagation and adjustments