{{Short description|Used to classify errors in distributed systems}} In [[distributed computing]], '''failure semantics''' is used to describe and classify [[error]]s that distributed systems can experience.<ref>[http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.30.591 Flaviu Christian, Understanding Fault-Tolerant Distributed Systems]</ref><ref>{{cite book|author=Arno Puder|author2=Kay Romer|author3=Frank Pilhofer|title=Distributed Systems Architecture| publisher=Morgan Kaufmann| year=2005| isbn=1558606483 }}, pp 14–16.</ref>
==Types of errors== A list of types of errors that can occur: * An omission error is when one or more responses fails. * A [[computer crash|crash error]] is when nothing happens. A crash is a special case of omission when all responses fail. * A [[Timing failure|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 (computing)|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 that are expected to appear. * Should another type of error appear it will lead to a service failure because it cannot be managed.
==References== {{reflist}}
[[Category:Failure]] [[Category:Distributed computing problems]]