Title

Enabling automatic adaptation in systems with under-specified elements

Date of Original Version

11-2002

Type

Conference Proceeding

Rights Management

Can archive pre-print and post-print or publisher's version/PDF

Abstract or Description

Software that people use for everyday purposes is usually not mission critical—some failures can be tolerated. However, this software should be dependable enough for its intended use, even when users change expectations. Software systems that could adapt to accommodate both failures and changing user expectations could significantly improve the dependability of such everyday software. Many adaptation techniques require specifications of proper behavior (for detecting improper behavior) and problem severity, alternatives and their selection (for mitigation and for repair). However, the specifications of everyday software are usually incomplete and imprecise. This makes it difficult to determine the dependability of the software and even more difficult to adapt. We address the problem of detecting anomalies—deviations from expected behavior—when specifications of expected behavior are missing. Setting up anomaly detection depends on human participation, yielding predicates that can serve as proxies for missing specifications. We propose a template mechanism to lower the demands on human attention when setting up detection. We show how this mechanism may be used in our framework for enhancing dynamic data feeds with automatic adaptation. We discuss how the same mechanism may be used in repair. Our emphasis is on detecting semantic anomalies: cases in which the data feed is responsive and delivers well-formed results, but these results are unreasonable.

Comments

Permission to make digital or hard copies of all or part 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. To copy otherwise, or republish, to post on servers or to redistribute to lists, requires prior specific permission and/or a fee. WOSS ’02, Nov 18-19, 2002, Charleston, SC, USA. Copyright 2002 ACM 1-58113-609-9/02/0011 ...$5.00

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