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Fault-tolerant distributed systems offer high reliability because even iffaults in their components occur, they do not exhibit erroneous behavior.Depending on the fault model adopted, hardware and software errors that do notresult in a process crashing are usually not tolerated. To tolerate theserather common failures the usual solution is to adopt a stronger fault model,such as the arbitrary or Byzantine fault model. Algorithms created for thisfault model, however, are considerably more complex and require more systemresources than the ones developed for less strict fault models. One approach toreach a middle ground is the non-malicious arbitrary fault model. This modelassumes it is possible to detect and filter faults with a given probability, ifthese faults are not created with malicious intent, allowing the isolation andmapping of these faults to benign faults. In this paper we describe how weincremented an implementation of active replication in the non-malicious faultmodel with a basic type of distributed validation, where a deviation from theexpected algorithm behavior will make a process crash. We experimentallyevaluate this implementation using a fault injection framework showing that itis feasible to extend the concept of non-malicious failures beyond hardwarefailures.

Decentralized Validation for Non-malicious Arbitrary Fault Tolerance in Paxos