To deal with this issue, we have built a scalable QoS management architecture capable of
supporting at run-time the QoS management phases (QoS specification, monitoring, and
guarantee), QoS provisioning, and assurance in delivering Web services. The scientific benefits
of our approach are twofold. First, it allows the automation of the QoS management,
and QoS monitoring for both providers and users of Web services. Second, the scalability
of our proposed architecture allows for a better handling of the increasing demand while
maintaining pre-agreed-on QoS between service requestors and providers.
The proposed solution challenges the following questions: How scalable is the Web services
architecture? Does the Web services architecture leads to a better scalability than the
traditional existing Web architectures? How could a scalable Web services architecture
be built in such a dynamic and unpredictable environment, and how could it support QoS
provision and management? To what extent is the level of advertised QoS is maintained in
such a scalable architecture?
The proposed architecture is based on the commonly-used notion of QoS brokerage service.
The QoS Broker mediates between service requestors and service providers.
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