Queries over Web Services

Tsamoura, Efthymia; Gounaris, Anastasios; Manolopoulos, Yannis

doi:10.1007/978-3-642-17551-0_6

Cited by 3 publications

(2 citation statements)

References 37 publications

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“…Data flow optimization bears also similarities with query optimization over Web Services (WSs) [104], especially when the valid orderings of the calls to the WSs are subject to dependency constraints. This survey includes all the WSs related techniques that can also be applied to data flows.…”

Section: Related Workmentioning

confidence: 99%

The many faces of data-centric workflow optimization: a survey

Gounaris

Simitsis

2018

Int J Data Sci Anal

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Workflow technology is rapidly evolving and, rather than being limited to modeling the control flow in business processes, is becoming a key mechanism to perform advanced data management, such as big data analytics. This survey focuses on data-centric workflows (or workflows for data analytics or data flows), where a key aspect is data passing through and getting manipulated by a sequence of steps. The large volume and variety of data, the complexity of operations performed, and the long time such workflows take to compute give rise to the need for optimization. In general, data-centric workflow optimization is a technology in evolution. This survey focuses on techniques applicable to workflows comprising arbitrary types of data manipulation steps and semantic inter-dependencies between such steps. Further, it serves a twofold purpose. Firstly, to present the main dimensions of the relevant optimization problems and the types of optimizations that occur before flow execution. Secondly, to provide a concise overview of the existing approaches with a view to highlighting key observations and areas deserving more attention from the community.

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Section: Related Workmentioning

confidence: 99%

The many faces of data-centric workflow optimization: a survey

Gounaris

Simitsis

2018

Int J Data Sci Anal

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“…It emphasizes the need for determining methods for fast and easy collaboration with end-users in the processes of SOA design, evaluation, and adjustment. As Web services proliferate, it is expected that system composition will involve several heterogeneous participants, with multiple ownership domains [Tsamoura et al 2011]. Naturally, a participant that provides the best alternative in comparison with other candidates should be chosen.…”

Section: Motivationmentioning

confidence: 99%

Bottom-Up Fault Management in Service-Based Systems

Alhosban

Hashmi

Malik

et al. 2015

ACM Trans. Internet Technol.

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Service Oriented Architecture (SOA) enables the creation of distributed applications from independently developed and deployed services. As with any component-based system, the overall performance and quality of the system is an aggregate function of its component services. In this article, we present a novel approach for managing bottom-up faults in service-based systems. Bottom-up faults are a special case of system-wide exceptions that are defined as abnormal conditions or defects occurring in component services, which if not detected and/or managed, may lead to runtime failures. Examples of bottom-up faults include network outage, server disruption, and changes to service provisioning (e.g., new operation parameter required) that may have an impact on the way component services are consumed. We propose a soft-state signaling-based approach to propagate these faults from participants to composite services. Soft-state refers to a class of protocols where the state of a service is constantly refreshed by periodic messages, and user/service takes up the responsibility of communicating and maintaining its state. Soft-state-based protocols have a number of advantages including implicit error recovery and easier fault management, resulting in high availability for systems. Although soft-state has been widely used in various Internet protocols, this work is the first (to the best of our knowledge) to adopt soft-state for fault management in composite services. The proposed approach includes protocols for fault propagation (pure soft-state and soft-state with explicit removal) and fault reaction (rule-based). We also present experiment results to assess the performance and applicability of our approach.

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Optimal Service Ordering in Decentralized Queries Over Web Services

Tsamoura

Gounaris

Manolopoulos

2011

International Journal of Knowledge-Based Organizations

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The problem of ordering expensive predicates (or filter ordering) has recently received renewed attention due to emerging computing paradigms such as processing engines for queries over remote Web Services, and cloud and grid computing. The optimization of pipelined plans over services differs from traditional optimization significantly, since execution takes place in parallel and thus the query response time is determined by the slowest node in the plan, which is called the bottleneck node. Although polynomial algorithms have been proposed for several variants of optimization problems in this setting, the fact that communication links are typically heterogeneous in wide-area environments has been largely overlooked. The authors propose an attempt to optimize linear orderings of services when the services communicate directly with each other and the communication links are heterogeneous. The authors propose a novel optimal algorithm to solve this problem efficiently. The evaluation of the proposal shows that it can result in significant reductions of the response time.

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Queries over Web Services

Cited by 3 publications

References 37 publications

The many faces of data-centric workflow optimization: a survey

The many faces of data-centric workflow optimization: a survey

Bottom-Up Fault Management in Service-Based Systems

Optimal Service Ordering in Decentralized Queries Over Web Services

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