关键词: 云应用,自配置,模型,运行时扩展

Abstract: Cloud-based application is one of the most important paradigms of cloud computing at application layer.These applications are usually constituted of a set of distributed components.Due to the dependencies between the components,there are correlations between the configuration parameters,which makes it difficult to configure the components correctly and to ensure the parameter consistencies at runtime,making system failed or service unavailable.To address this issue,we proposed a model-based self-configuration method for cloud-based applications,which realizes the automatic choreography for component configuration,ensures configuration consistency and improves the reliability of runtime scale.Firstly,this method proposes a model to specify application topology in a declarative way.This model describes application components in form of services,and makes the separation of components and their relations.Then this method designes a self-configuration protocol to support component configurations at runtime.Based on service re-gistration and service discovery,this protocol decouples the component dependencies and ensures the consistencies of changing the configuration values.We also implemented a prototype based on this method and evaluated the effectiveness of this method with a typical application BookStore-TPCW.

Key words: Cloud-based application, Self-configuration,Model,Runtime scale