RECOVERY UNIFICATION FOR CONCURRENT HETEROGENEOUS SYSTEMS

The purpose of this paper is to investigate the coordinated recovery o f concurrently functioning interacting components of a heterogeneous s ystem. By the heterogeneous system components we mean its parts which are developed either independently or within different programming par adigms, or which employ different fault-tolerance facilities. A genera l approach to determining the principles of ensuring the joint operati on of components is given. The paper proposes considering the well-kno wn approaches to unplanned backward recovery as a basis for developing fault-tolerance facilities in heterogeneous systems. The main balance point for creating a usable system - the point between the run-time s ystem and the facilities for application programmers - is described. T he order of engineering steps in developing a heterogeneous fault-tole rant system is suggested.