Comunicação Não Confiável em Detectores de Defeitos com Falhas por Crash
Résumé
The definition of failure detectors to be used on environments with crash failure hypothesis has some severe restrictions even in its weaker implementations. Yet, failure detectors are possible in distributed asynchronous systems, if we use technics to circumvent these restrictions, like the timeouts. During the construction of failure detectors, the need of reliable communication is an important factor: even if the definition if the failure detectors requires reliable communication, practical experiences show that we can use unreliable communication in its construction. This paper focuses on the native choices for reliable and unreliable communication, TCP and UDP, examining their impact on failure detectors' behavior.
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