Verteilter Algorithmus , Verteiltes System , Fehlertoleranz
Abstract:
This work investigates the amount of information about failures required to simulate a synchronous distributed system by an asynchronous distributed system prone to crash-recovery failures. A failure detection sequencer SigmaCR for the crash-recovery failure model is defined, which outputs information about crashes and recoveries and about the state of the crashed or recovered processes. Using the simulation technique of a synchronizer, it is shown that in general it is impossible to implement a synchronizer in an asynchronous distributed system with an arbitrary number of concurrent crash-recovery faults. It is shown that a synchronizer is implementable given SigmaCR and an asynchronous distributed system with at least one correct process. Furthermore, it is proven that SigmaCR can be emulated in a synchronous distributed system and hence can be regarded as the weakest failure detection device suitable to implement a synchronizer in the crash-recovery failure model.
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