SUPPORTING FAULT-TOLERANT DISTRIBUTED COMPUTATIONS UNDER REAL-TIME REQUIREMENTS

In contrast to conventional (trans)action concepts, the proposed dynamic action model includes the possibility for optimistic recovery to gain high efficiency during normal operation. To minimize time overhead we use a redundant recovery graph to record the necessary recovery information. Based on this graph we provide decentralized protocols that efficiently produce a consistent system state concurrent to normal system activity. Considering real-time applications in distributed systems, error processing time has to be minimized. To achieve this, the proposed concept is extended to the parallel dynamic action scheme where the different versions are executed in parallel. This leads to a recovery concept that combines efficient distributed processing during normal operation and prompt reaction in case of an error.