Application-Layer Fault-Tolerance Protocols

Florio, Vincenzo De

doi:10.4018/978-1-60566-182-7

Cited by 7 publications

(7 citation statements)

References 60 publications

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“…The type of behaviour exercised by a system constituteswe deem-a second important characteristic of that system with reference to its ability to improve dynamically its systemenvironment fit. This "second coordinate" of a system's fidelity to systemic, operational, and environmental assumptions is meant to bring to the foreground how dependant an open system actually is on its system model-namely, on its prescribed assumptions and working conditions [12], [31].…”

Section: Fragility As a Measure Of Assumptions Dependencementioning

confidence: 99%

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Antifragility = Elasticity + Resilience + Machine Learning Models and Algorithms for Open System Fidelity

Florio

2014

Procedia Computer Science

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We introduce a model of the fidelity of open systems-fidelity being interpreted here as the compliance between corresponding figures of interest in two separate but communicating domains. A special case of fidelity is given by real-timeliness and synchrony, in which the figure of interest is the physical and the system's notion of time. Our model covers two orthogonal aspects of fidelity, the first one focusing on a system's steady state and the second one capturing that system's dynamic and behavioural characteristics. We discuss how the two aspects correspond respectively to elasticity and resilience and we highlight each aspect's qualities and limitations. Finally we sketch the elements of a new model coupling both of the first model's aspects and complementing them with machine learning. Finally, a conjecture is put forward that the new model may represent a first step towards compositional criteria for antifragile systems.

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Section: Fragility As a Measure Of Assumptions Dependencementioning

confidence: 99%

“…This model considers the system and its intended deployment environments as known and stable entities (cf. synchronous system model [12]) and identifies a snapshot of the system in its intended (viz., "normal") operational conditions.…”

Section: Introductionmentioning

confidence: 99%

Antifragility = Elasticity + Resilience + Machine Learning Models and Algorithms for Open System Fidelity

Florio

2014

Procedia Computer Science

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“…Each processing node in the system runs an instance of a so-called "I'm Alive Task" (IAT) plus an instance of either a "DIR Manager" (DIR-M), or a "DIR Agent" (DIR-A), or a "DIR Backup Agent" (DIR-B) is eligible for election as a DIR-M. A DIR-M is a special case of DIR-B. Unique within the system, the DIR-M is the one component responsible for running error recovery strategies-see [15] for a description of the latter. Let us use DIR-x to address any non-IAT component (i.e.…”

Section: A Development Experience: the Dir Netmentioning

confidence: 99%

“…What we call "DIR net" [15] is the distributed application at the core of the software fault tolerance strategy realized through several European projects [15,16]. In this section we describe the DIR net and report on how we designed and developed it by means of the TOM system.…”

Section: A Development Experience: the Dir Netmentioning

confidence: 99%

“…It is connected to DIR-M and to the other DIR-B's and is eligible for election as a DIR-M. A DIR-M is a special case of DIR-B. Unique within the system, the DIR-M is the one component responsible for running error recovery strategies-see [15] for a description of the latter. Let us use DIR-x to address any non-IAT component (i.e.…”

Section: A Development Experience: the Dir Netmentioning

confidence: 99%

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Design tool to express failure detection protocols

Florio¹,

Blondia²

2010

IET Softw.

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Failure detection protocols-a fundamental building block for crafting fault-tolerant distributed systems-are in many cases described by their authors making use of informal pseudo-codes of their conception. Often these pseudo-codes use syntactical constructs that are not available in COTS programming languages such as C or C++. This translates into informal descriptions that call for ad hoc interpretations and implementations. Being informal, these descriptions cannot be tested by their authors, which may translate into insufficiently detailed or even faulty specifications. This paper tackles this problem introducing a formal syntax for those constructs and a C library that implements them-a tool-set to express and reason about failure detection protocols. The resulting specifications are longer but non ambiguous, and eligible for becoming a standard form.

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Systems, Resilience, and Organization: Analogies and Points of Contact with Hierarchy Theory

Florio

2017

Procedia Computer Science

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Aim of this paper is to provide preliminary elements for discussion about the implications of the Hierarchy Theory of Evolution on the design and evolution of artificial systems and socio-technical organizations. In order to achieve this goal, a number of analogies are drawn between the System of Leibniz; the socio-technical architecture known as Fractal Social Organization; resilience and related disciplines; and Hierarchy Theory. In so doing I intend to provide elements for reflection and, hopefully, enrich the discussion on the above topics with considerations pertaining to related fields and disciplines, including computer science, management science, cybernetics, social systems, and general systems theory.

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Application-Layer Fault-Tolerance Protocols

Cited by 7 publications

References 60 publications

Antifragility = Elasticity + Resilience + Machine Learning Models and Algorithms for Open System Fidelity

Antifragility = Elasticity + Resilience + Machine Learning Models and Algorithms for Open System Fidelity

Design tool to express failure detection protocols

Systems, Resilience, and Organization: Analogies and Points of Contact with Hierarchy Theory

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