Automated SLA Monitoring for Web Services

Sahai, Akhil; Machiraju, Vijay; Sayal, Mehmet; Moorsel, Aad P. A. van; Casati, Fabio

doi:10.1007/3-540-36110-3_6

Cited by 245 publications

(187 citation statements)

References 4 publications

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“…Fortunately, other proposals do allow to assign a validity period to every condition of a demand or an offer, such as the IBM WSLA Web Services Level Agreement language [6,11] and the WSOL Web Service Offerings Language [23]. The HP WSML Web Services Level Agreement Management language [19] allows to specify both a single validity period for the entire agreement and also a periodic temporal interval to every condition. Both WSLA and WSML languages allow validity periods to be composed of multiple sub-intervals in distinct, limited ways as well.…”

Section: Proposals Based On Ad-hoc Formalismsmentioning

confidence: 99%

An Approach to Temporal-Aware Procurement of Web Services

Martín–Díaz

Ruiz–Cortés

Durán

et al. 2005

Service-Oriented Computing – ICSOC 2007

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Abstract. In the context of web service procurement (WSP), temporal-awareness refers to managing service demands and offers which are subject to validity periods, i.e. their evaluation depends not only on quality of service (QoS) values but also on time. For example, the QoS of some web services can be considered critical in working hours (9:00 to 17:00 from Monday to Friday) and irrelevant at any other moment. Until now, the expressiveness of such temporal-aware specifications has been quite limited. As far as we know, most proposals have considered validity periods to be composed of a single temporal interval. Other proposals, which could allow more expressive time-dependent specifications, have not performed a detailed study about all the underlying complexities of such approach, in spite of the fact that dealing with complex expressions on temporality is not a trivial task at all. As a matter of fact, it requires a special design of the so-called procurement tasks (consistency and conformance checking, and optimal selection). In this paper, we present a constraint-based approach to temporal-aware WSP. Using constraints allows a great deal of expressiveness, so that not only demands and offers can be assigned validity periods but also their conditions can be assigned (possibly multiple) validity temporal subintervals. Apart from revising the semantics of procurement tasks, which we previously presented in the first edition of the ICSOC conferences, we also introduce the notion of the covering set of a demand, a topic which is closely related to temporality.

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Section: Proposals Based On Ad-hoc Formalismsmentioning

confidence: 99%

An Approach to Temporal-Aware Procurement of Web Services

Martín–Díaz

Ruiz–Cortés

Durán

et al. 2005

Service-Oriented Computing – ICSOC 2007

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“…Similarly, the work we have presented in [2] allows for an analysis of the impact that certain factors have on the performance of service compositions. SLA prediction as discussed in this paper has first been discussed in [8], which is based on some early work of HP Laboratories on SLA monitoring for Web services [9]. In [8], the authors introduced some concepts which are also present in our solution, such as the basic idea of using prediction models based on machine learning techniques, or the trade-off between early prediction and prediction accuracy.…”

Section: Related Workmentioning

confidence: 99%

Runtime Prediction of Service Level Agreement Violations for Composite Services

Leitner

Wetzstein

Rosenberg

et al. 2010

Lecture Notes in Computer Science

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Abstract. SLAs are contractually binding agreements between service providers and consumers, mandating concrete numerical target values which the service needs to achieve. For service providers, it is essential to prevent SLA violations as much as possible to enhance customer satisfaction and avoid penalty payments. Therefore, it is desirable for providers to predict possible violations before they happen, while it is still possible to set counteractive measures. We propose an approach for predicting SLA violations at runtime, which uses measured and estimated facts (instance data of the composition or QoS of used services) as input for a prediction model. The prediction model is based on machine learning regression techniques, and trained using historical process instances. We present the basics of our approach, and briefly validate our ideas based on an illustrative example.

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“…Although their approach has similarities to ours, their goals focus on runtime adaptability, and not on service compositions and their SLA dependencies. Sahai et al [14] aim at automated SLA monitoring by specifying SLAs and not only considering provider side guarantees but focus also on distributed monitoring, taking the client side into account as well. Barbon et al [15] enable run-time monitoring while separating business logic from monitoring functionality.…”

Section: Related Workmentioning

confidence: 99%

Empirical Validation of MoDe4SLA; Approach for Managing Service Compositions

Bodenstaff

Wombacher

Reichert

2011

Business Information Systems

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Abstract. For companies managing complex Web service compositions, challenges arise which go far beyond simple bilateral contract monitoring. For example, it is not only important to determine whether or not a component (i.e., Web service) in a composition is performing properly, but also to understand what the impact of its performance is on the overall service composition. To tackle this challenge, in previous work we developed MoDe4SLA which allows managing and monitoring dependencies between services in a composition. This paper empirically validates MoDe4SLA through an extensive and interactive experiment among 34 participants.

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Automated SLA Monitoring for Web Services

Cited by 245 publications

References 4 publications

An Approach to Temporal-Aware Procurement of Web Services

An Approach to Temporal-Aware Procurement of Web Services

Runtime Prediction of Service Level Agreement Violations for Composite Services

Empirical Validation of MoDe4SLA; Approach for Managing Service Compositions

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