Recovery Guarantees for Internet Applications

Internet-based e-services require application developers to deal explicitly with failures of the underlying software components, for example web servers, servlets, browser sessions, and so forth. This

complicates application programming, and may expose failures to end users. This paper presents a framework for an application-independent infrastructure that provides recovery guarantees and

masks almost all system failures, thus relieving the application programmer from having to deal with these failures—by making applications “stateless.” The main concept is an interaction contract

between two components regarding message and state preservation. The framework provides comprehensive recovery encompassing data, messages, and the states of application components. We describe techniques to reduce logging cost, allow effective log truncation, and permit independent recovery for critical components. We illustrate the framework’s utility via web-based e-services scenarios. Its feasibility is demonstrated by our prototype implementation of interaction contracts based on the Apache web server and thePHPservlet engine. Finally,we discuss industrial relevance

for middleware architectures such as .Net or J2EE.

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In  ACM Transactions on Internet Technology,

Publisher  Association for Computing Machinery, Inc.
Copyright © 2007 by the Association for Computing Machinery, Inc. Permission to make digital or hard copies of part or all of this work for personal or classroom use is granted without fee provided that copies are not made or distributed for profit or commercial advantage and that copies bear this notice and the full citation on the first page. Copyrights for components of this work owned by others than ACM must be honored. Abstracting with credit is permitted. To copy otherwise, to republish, to post on servers, or to redistribute to lists, requires prior specific permission and/or a fee. Request permissions from Publications Dept, ACM Inc., fax +1 (212) 869-0481, or The definitive version of this paper can be found at ACM’s Digital Library --


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