EEMCS

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Official URL: http://dx.doi.org/10.1109/Services-2.2009.27

Abstract

Many companies offer physical products combined with
on-line services. For example, product configuration, ordering,
order tracking, and payments can be done on-line.
The service part of the total offering (the composition) is
typically composed of services offered by providers where
performance of both the composition (provided by the company)
and the input services (obtained from providers) is
governed by service level agreements (SLAs). The goal of
our approach is to diagnose the performance of an on-line
service composition in terms of the performance of on-line
input services, with respect to the performance indicators
mentioned in the SLAs, and to do this in real-time.
Classical SLA monitoring techniques are batch-oriented
and are not usable in the highly dynamic environment of
Web service provision, where provider relations may change
even during service delivery. Our techniques use real-time
analysis of log files to trace and diagnose performance onthe-
fly. Current Web service monitoring techniques do not
relate a composite service to its components, as needed to
provide diagnostic information. Furthermore, current approaches
do not take into account that the dependency of a
composition on its components varies for different attributes
(such as cost and response time). In this paper we propose
to extend our previous research in this area by lifting a number
of simplifying assumptions to make the approach applicable
in real-life, and by extending our study to frequently
used SLAs in practice.

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