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Today, there are several trends that are forcing application architectures to evolve. Users expect a rich, interactive and dynamic user experience on a wide variety of clients including mobile devices. Applications must be highly scalable, highly available and run on cloud environments. Organizations often want to frequently roll out updates, even multiple times a day. Consequently, it’s no longer adequate to develop simple, monolithic web applications that serve up HTML to desktop browsers.
Microservices refers to an architectural style for developing applications. Microservices allow a large application to be decomposed into independent constituent parts, with each part having its own realm of responsibility. To serve a single user or API request, a microservices-based application can call many internal microservices to compose its response.
A properly implemented microservices-based application can achieve the following goals:
- Define strong contracts between the various microservices.
- Allow for independent deployment cycles, including rollback.
- Facilitate concurrent, A/B release testing on subsystems.
- Minimize test automation and quality-assurance overhead.
- Improve clarity of logging and monitoring.
- Provide fine-grained cost accounting.
- Increase overall application scalability and reliability.
Google App Engine has a number of features that are well-suited for a microservices-based application. This page outlines best practices to use when deploying your application as a microservices-based application on Google App Engine.