[Show abstract][Hide abstract] ABSTRACT: A dynamic validation process is described for an ap- plication (metadata extraction from scanned docu- ments) where a moderate failure rate is acceptable provided that instances of failures during operation could be identified. Lacking a plausible exact oracle for the application, a series of statistical models of output characteristics is employed. Flexibility and adaptability is achieved by developing a customized scripting language describing how the various tests should be combined to obtain an overall measure of confidence in a program output. The suitability of the validator was demonstrated by an experiment measuring its ability to mimic human judgments as to which of several alternate outputs for the same document would be preferred.
[Show abstract][Hide abstract] ABSTRACT: Context: Over recent years, software developers have been evaluating the benefits of both Service-Oriented Architecture and software fault tolerance techniques based on design diversity by creating fault-tolerant composite services that leverage functionally equivalent services, or variant services. Three major design issues need to be considered while building software fault-tolerant architectures based on design diversity namely, selection and execution of variants and selection of an adjudication algorithm to determine the correct or adjudicated result from the variants. Each design issue, in turn, can be realized by a set of alternative design solutions, which present different degrees of quality requirements (e.g. memory consumption and reliability). Objective: To investigate whether existing approaches for fault-tolerant composite services support the above mentioned design issues and to provide a detailed classification of the analysed approaches. Method: A systematic literature review of diversity-based approaches for fault-tolerant composite services, which compose our primary studies. Results: We found 17 primary studies providing direct evidence about the research question. Our findings reveal that the primary studies support a wide variety of design decisions. For example, (i) variant services may be chosen at different points during the software lifecycle; (ii) both parallel and sequential execution schemes have been addressed; and (iii) a variety of adjudication mechanisms were found amongst the target papers. Conclusion: We build up a broad picture of what design issues have been addressed by existing diversity-based approaches for fault-tolerant composite services. Finally, practical issues and difficulties are summarized and directions for future work are suggested.
Proceedings of the 17th International Conference on Evaluation and Assessment in Software Engineering; 04/2013
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