Decentralized Microservice compositions can be implemented in the environments of mobile cloud, edge or other computing paradigms. When a decentralized microservice composition wants to reach consensus among its participants at runtime, missing a coordinator makes it to adopt a feasible mechanism to coordinate service components. This work studies the issue. It begins with analyzing data dependences among composite microservices, and then summaries basic structural patterns in the compositions according to the dependences. Based on the Saga method, this paper proposes coordination mechanisms for the composite microservices, and conducts two different experiments to evaluate the mechanisms. The experimental results show that the proposed mechanisms can prompt composite microservices to reach consensus at runtime, and the corresponding implementations can work effectively.

分散式微服务组合可以在移动云，边缘或其他计算范式的环境中实现。当分散的微服务组合希望在运行时在其参与者之间达成共识时，缺少协调器将使其采用一种可行的机制来协调服务组件。这项工作研究了这个问题。首先分析复合微服务之间的数据依赖关系，然后根据依赖关系总结组合中的基本结构模式。基于Saga方法，提出了复合微服务的协调机制，并进行了两次不同的实验，以评价机制。实验结果表明，所提出的机制可以促使组合微服务在运行时达成共识，