Application-layer Fault-Tolerance Protocols
release_my2uj2n2hrf4ljzpmbh4zlk57q
by
Vincenzo De Florio
2016
Abstract
The central topic of this book is application-level fault-tolerance, that is
the methods, architectures, and tools that allow to express a fault-tolerant
system in the application software of our computers. Application-level
fault-tolerance is a sub-class of software fault-tolerance that focuses on the
problems of expressing the problems and solutions of fault-tolerance in the top
layer of the hierarchy of virtual machines that constitutes our computers. This
book shows that application-level fault-tolerance is a key ingredient to craft
truly dependable computer systems--other approaches, such as hardware
fault-tolerance, operating system fault-tolerance, or fault-tolerant
middleware, are also important ingredients to achieve resiliency, but they are
not enough. Failing to address the application layer means leaving a backdoor
open to problems such as design faults, interaction faults, or malicious
attacks, whose consequences on the quality of service could be as unfortunate
as, e.g., a physical fault affecting the system platform. In other words, in
most cases it is simply not possible to achieve complete coverage against a
given set of faults or erroneous conditions without embedding fault-tolerance
provisions also in the application layer.
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