Cloud federation is an aggregation of services from different providers in a single pool supporting interoperability and resource migration. In federation, Services are assigned to the consumer’s service access pool as per their specific functional and associated Quality level requirements. The said assignment is based on the advertised features of services. Sometimes, the selected provider fails to provide the committed service or, it fails to fulfill the expected QoS level. As a result, the consumer is being deprived of getting the services at required quality levels, in spite of subscribing and paying. Re-federation i.e. the inclusion of new services from different providers in the resource pool is a solution. This costly and time consuming re-federation process harms the overall harmony, reputation and performance of the existing federation. In this paper, the necessary strategies to make a federation autonomic is proposed. It helps federation to work in a self-adaptive manner by delaying the re-federation process through replacement and negotiation mechanisms. This allows the federation to keep a balanced state in case of failures. The proposed methods are simulated and the claims are substantiated by the preliminary experimental outcomes.

中文翻译：

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云服务生态系统中的可替换性和协商

云联合是单个池中来自不同提供商的服务的聚合，支持互操作性和资源迁移。在联盟中，根据服务的特定功能和相关的质量级别要求，将服务分配给消费者的服务访问池。所述分配基于服务的广告特征。有时，选定的提供程序无法提供承诺的服务，或者无法满足预期的QoS级别。结果，尽管订阅和付款，消费者仍然无法获得所需质量的服务。重新联合，即在资源池中包含来自不同提供商的新服务是一种解决方案。这种昂贵且耗时的重新联合过程损害了现有联合会的整体和谐，声誉和绩效。本文提出了实现联盟自治的必要策略。它通过替换和协商机制延迟重新联盟过程，从而帮助联盟以自适应方式工作。这允许联合会在发生故障的情况下保持平衡状态。模拟了所提出的方法，并通过初步的实验结果证实了权利要求。