Building stateful serverless applications with Knative and Restate

Knative simplifies the development and operation of serverless applications on Kubernetes, but building stateful applications remains challenging until the introduction of Restate, an open-source Durable Execution Engine. Restate allows developers to manage stateful serverless applications by storing execution progress, enabling the restoration of applications to their previous state after crashes, and performing complex service coordination within Knative services without dealing with distributed systems issues. It supports various languages, including Golang, Java, Kotlin, Typescript, Rust, and Python, and can be deployed as a stateful deployment on Kubernetes or used as a managed service. By integrating Restate with Knative, developers can create scalable, stateful microservices, implement saga patterns, and deduplicate events while benefiting from Knative's scale-to-zero capabilities during periods of inactivity. Restate acts as a proxy between clients and services, ensuring state consistency and cross-service communication, and it supports workflows, sagas, and stateful event processing, providing a robust solution for stateful serverless application development.