Coordinated Atomic Actions and System Fault Tolerance
Coordinated Atomic Actions and System Fault Tolerance
Coordinated Atomic Actions and System Fault Tolerance
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3. CA <strong>Actions</strong>: A Case StudyThe program controls the FZI simulator. Overlaid on the screen are rectangularoutlines showing the scopes of these CA actions.As the simulator is operated each of these outlines is gradually shaded in each timethe corresponding CA action is executed - the colour of this shading is changedwhen the CA action is involved in exception h<strong>and</strong>ling, in response to simulatedfaults.A fault injector was implemented.All injected device or sensor failures were caught successfully <strong>and</strong> h<strong>and</strong>ledimmediately by our control program. A previously unknown bug in the FZIsimulator was detected by a CA action <strong>and</strong> recovered automatically by the actionusing the retry operation.19 February, 2004
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