Filip Krikava

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The software engineering community has proposed numerous approaches for making software self-adaptive. These approaches take inspiration from machine learning and control theory, constructing software that monitors and modifies its own behavior to meet goals. Control theory, in particular, has received considerable attention as it represents a general(More)
There is a trade-off between the number of concurrently running MapReduce jobs and their corresponding map and reduce tasks within a node in a Hadoop cluster. Leaving this trade-off statically configured to a single value can significantly reduce job response times leaving only sub optimal resource usage. To overcome this problem, we propose a feedback(More)
Engineering self-adaptive systems is a particularly challenging problem. On the one hand, it is hard to develop the right control model that drives the adaptation; on the other hand, the implementation and integration of this control model into the target system is a difficult and an error-prone activity. Models@runtime is a promising approach to managing(More)
A common approach for engineering self-adaptive software systems is to use Feedback Control Loops (FCLs). Advances have led to more explicit and safer design of some control architectures, however, there is a need for more integrated and systematic approaches that support end-to-end integration of FCLs into software systems. In this paper, we propose a(More)
In Model-Driven Engineering, a number of external <i>Domain-Specific Languages</i> (DSL) for model manipulation have been proposed. However, they require users to learn new languages that, together with their execution performance, usability and tool support limitations, can significantly contribute to accidental complexities. In this paper, we present an(More)
The Object Constraint Language (OCL) is widely used to enrich modeling languages with structural constraints, side effect free query operations implementation and contracts. OCL was designed to be small and compact language with appealing short "to-the-point" expressions. When trying to apply it to larger EMF models some shortcomings appear in the language(More)
Control theory provides solid foundations for developing reliable and scalable feedback control for software systems. Although, feedback controllers have been acknowledged to efficiently solve common classes of problems, their adoption by state-of-the-art approaches for designing self-adaptation in legacy software systems remains limited and at best(More)