Specifying and Executing Intertask Dependencies

TitleSpecifying and Executing Intertask Dependencies
Publication TypeConference Paper
Year of Publication1993
AuthorsAmit Sheth, P. Attie, Marek Rusinkiewicz, M. Singh
Conference NameSpecifying and Executing Intertask Dependencies
Pagination134-145
Conference LocationDublin, Ireland
Abstract

Extensions of the traditional atomic transaction model are needed to support the development of multi-system applications or workflows that access heterogeneous databases and legacy application systems. Most extended transaction models use conditions involving events or dependencies between transactions. Intertask dependencies can serve as a uniform framework for defining extended transaction models. In this paper we introduce event attributes needed to determine whether a dependency is enforceable and to properly schedule events in extended transaction models. Using these attributes and a formalization of a dependency into the temporal logic CTL, we can automatically synthesize an automaton that captures the computations that satisfy the given dependency. We show how a set of such automata can be combined into a scheduler that produces global computations satisfying all relevant dependencies. We show how dependencies required to implement relaxed transactions such as Sagas can be enforced and discuss briefly the issues of concurrency control, safety, and recoverability.

Full Text

P. Attie, M. Singh, A. Sheth, and M. Rusinkiewicz, 'Specifying and Executing Intertask Dependencies,' in Proceedings of the 19th International Conference on Very Large Data Bases, Dublin, Ireland, August 1993, pp.134-145.

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