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CTP: An Optimistic Commit Protocol for Conversational Transactions

Quyang, Jinsong; Sahai, Akhil; Machiraju, Vijay


Keyword(s): Internet; conversations; management; transactions

Abstract: E-services are composite in nature. The composition can be static or dynamic. As these e-services are being deployed by different enterprises, they are cross-domain and federated in nature. To conduct a business task, an e-service undertakes a conversation that spans across multiple e-services, which is often asynchronous and asymmetric. Within a conversation, the unit of business at each e-service is called a component transaction. The component transactions within a conversation form a conversational transaction. Each component transaction is autonomous and independent while it is relative to each other only in the context of a specific conversation. A conversational transaction is committed if each component is committed, or recommitted after compensation. If one or more component transactions abort, the conversational transaction, depending on the business logic, may need to be canceled--the committed component transactions need to be canceled-- though not every transaction is cancellable after a certain point. In this paper, we argue that the traditional transaction semantics and mechanisms do not apply well in the e-service world, and propose an optimistic commit protocol to provide transaction support, i.e., all-or-nothing semantics, for conversational transactions.

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