What if you need reliability comparable to paper? In the manufacturing industry downtime is very expensive, therefore most small and midsize factories are still managed using paper-based processes. The problem space is perfectly suited for the microservices approach: well-defined and locally encapsulated responsibilities, collaboration and loose coupling between different links in the chain, rapid evolution of individual pieces for the purpose of optimising business outcomes. But how can we operate microservices such that they can deliver the resilience of paper? How can we leverage the locality of process data and benefit from high bandwidth and low latency communication in the Internet of Things?
This talk explores the radical approach of operating microservices in a peer-to-peer network on the factory shop-floor, using event sourcing as the only means of communication and observation. We discuss the consequences of going all in on availability and partition tolerance. In particular consider eventual consistency and its impact on replacing nodes, upgrading services, and evolving event schemas. And we see how event sourcing can help understand the behaviour of such an uncompromisingly distributed system and enable powerful testing—both before and after hitting an issue in production.
Commit Porto '19 - June 22, 2019
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