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Elevator Pitch – Beyond Hello World applications, zero-downtime deployments are not trivial. In this talk, I’ll demo how to achieve that on a Spring Boot application using Kubernetes and Hazelcast.
Kubernetes allows a lot. After discovering its features, it’s easy to think it can magically transform your application deployment process into a painless no-event. For Hello World applications, that is the case. Unfortunately, not many of us do deploy such applications day-to-day because we need to handle state. Though it would be much easier to have stateless apps, and despite our best efforts in this direction, state is found in (at least) two places: sessions and databases.
You need to think keeping the state while stopping and starting application nodes. In this talk, I’ll demo how to update a Spring Boot app deployed on a Kubernetes cluster with a non-trivial database schema change with the help of Hazelcast IMDG & Hazelcast Jet, while keeping the service up during the entire update process.