Providing dependability for web services (original) (raw)

Dependability in the Web Services Architecture

Lecture Notes in Computer Science, 2003

The Web services architecture is expected to play a prominent role in developing next generation distributed systems. This chapter discusses how to build dependable systems based on the Web services architecture. More specifically, it surveys base fault tolerance mechanisms, considering both backward and forward error recovery mechanisms, and shows how they are adapted to deal with the specifics of the Web in the light of ongoing work in the area. Existing solutions, targeting the development of dependable composite Web services, may be subdivided into two categories that are respectively related to the specification of Web services composition and to the design of dedicated distributed protocols.

A Fault Tolerant Web Service Architecture

2007 Latin American Web Conference (LA-WEB 2007), 2007

Web services have been pointed as a suitable technology for the development and execution of distributed applications. However, the Web service architecture still lacks facilities to support fault tolerance. The goal of this paper is to propose a fault tolerant Web service architecture. The architecture provides service mediation and monitoring. The main contribution of this paper is the use of Web service standards to include fault tolerance in the Web service architecture.

Making Web Services Dependable

2006

Web services offer great promise for integrating and automating software applications within and between enterprises over the Internet. However, ensuring that Web services are dependable, and can satisfy their clients' requests when the clients need them is a real challenge because, typically, a business activity involves multiple Web services and a Web service involves multiple components, each of which must be dependable. In this paper, we describe fault tolerance techniques, including replication, checkpointing, and message logging, in addition to reliable messaging and transaction management for which Web services specifications exist. We discuss how those techniques can be applied to the components of the Web services involved in the business activities to render them dependable.

Dependability in the Web Service Architecture

In comparison with the state of the art in the field of Web Services architectures and their composition, we propose to exploit the concept of CA Actions to enable to dependable composition of Web Services. CA Actions introduce a mechanism for structuring fault tolerant concurrent systems through the generalization of the concepts of atomic actions and transactions, and are adapted to the composition of autonomous services.

Fault tolerance in web services

Ubiquity, 2006

This paper demonstrates how to design a fault tolerant web application that relies on an affordable redundancy in data and function using Simple Object Access Protocol (SOAP). The proposed approach relies on a Single-Version fault tolerance model without using multiple versions or the N-Version fault tolerance model. The work aims to design a more dependable and reliable Web Service system at no extra cost on multiple versions.

Transparent fault tolerance for web services based architectures

Euro-Par 2002 Parallel …, 2002

Service-based architectures enable the development of new classes of Grid and distributed applications. One of the main capabilities provided by such systems is the dynamic and flexible integration of services, according to which services are allowed to be a part of more than one distributed system and simultaneously serve different applications. This increased flexibility in system composition makes it difficult to address classical distributed system issues such as fault-tolerance. While it is relatively easy to make an individual service fault-tolerant, improving fault-tolerance of services collaborating in multiple application scenarios is a challenging task. In this paper, we look at the issue of developing fault-tolerant service-based distributed systems, and propose an infrastructure to implement fault tolerance capabilities transparent to services.

A Lightweight Fault Tolerance Framework for Web Services

2007

In this paper, we present the design and implementation of a lightweight fault tolerance framework for Web services. With our framework, a Web service can be rendered fault tolerant by replicating it across several nodes. A consensusbased algorithm is used to ensure total ordering of the requests to the replicated Web service, and to ensure consistent membership view among the replicas. The framework is built by extending an open-source implementation of the WS-ReliableMessaging specification, and all reliable message exchanges in our framework conform to the specification. As such, our framework does not depend on any proprietary messaging and transport protocols, which is consistent with the Web services design principles. Our performance evaluation shows that our implementation is nearly optimal and the framework incurs only moderate runtime overhead.

Ftweb: A fault tolerant infrastructure for web services

EDOC Enterprise Computing …, 2005

The web services architecture came as answers to the search for interoperability among applications. In recent years there has been a growing interest in deploying on the Internet applications with high availability and reliability requirements. However, the technologies associated with this architecture still do not deliver adequate support to this requirement. The model proposed in this article is located in this context and provides a new layer of software that acts as a proxy between client requests and service delivery by providers. The main objective is to ensure client transparent fault tolerance by means of the active replication technique. This model supports the following faults: value, omission and stops. This paper describes the features and outcomes obtained through the implementation of this model.

An approach for Dependable Web Service Compositions

The broad acceptance of web service standard has lead enterpr ises worldwide to publish their services and make business via the W eb over the In- ternet. In this trend, mission-critical applications thatdemand high availability are a new challenge to be considered. Although many existing works propose to extend the web service structure with fault tolerant featuresthat support such ap- plications, most of them meet only the reliability and avail ability requirements of web service executions, not properly addressing the problemof dependable web service compositions. This paper overviews existing works on web service execu- tion and composition and discusses a new approach to make a co mposition more reliable: it tolerates some component failures during the c omposition process. The proposed approach is being incorporated into the SPOC frame work, a framework that deals with automatic web service composition.

WS-replication: a framework for highly available web services

2006

Due to the rapid acceptance of web services and its fast spreading, a number of mission-critical systems will be deployed as web services in next years. The availability of those systems must be guaranteed in case of failures and network disconnections. An example of web services for which availability will be a crucial issue are those belonging to coordination web service infrastructure, such as web services for transactional coordination (e.g., WS-CAF and WS-Transaction). These services should remain available despite site and connectivity failures to enable business interactions on a 24x7 basis. Some of the common techniques for attaining availability consist in the use of a clustering approach. However, in an Internet setting a domain can get partitioned from the network due to a link overload or some other connectivity problems. The unavailability of a coordination service impacts the availability of all the partners in the business process. That is, coordination services are an example of critical components that need higher provisions for availability. In this paper, we address this problem by providing an infrastructure, WS-Replication, for WAN replication of web services. The infrastructure is based on a group communication web service, WS-Multicast, that respects the web service autonomy. The transport of WS-Multicast is based on SOAP and relies exclusively on web service technology for interaction across organizations. We have replicated WS-CAF using our WS-Replication framework and evaluated its performance.