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In distributed computing, failure semantics is used to describe and classify errors that distributed systems can experience.〔(Flaviu Christian, Understanding Fault-Tolerant Distributed Systems )〕〔, pp 14–16.〕 ==Types of errors== A list of types of errors that can occur: * An omission error is when one or more responses fails. * A crash error is when nothing happens. A crash is a special case of omission when all responses fails. * A Timing error is when one or more responses arrive outside the time interval specified. Timing errors can be ''early'' or ''late''. An omission error is a timing error when a response has infinite timing error. * An arbitrary error is any error, (i.e. a wrong value or a timing error). * When a client uses a server it can cope with different type errors from the server. * * If it can manage a crash at the server it is said to assume the server to have crash failure semantics. * * If it can manage a service omission it is said to assume the server to have omission failure semantics. * * * Failure semantics are the type of errors are expected to appear. * Should another type of error appear it will lead to a service failure because it cannot be managed. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Failure semantics」の詳細全文を読む スポンサード リンク
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