ronmex

I'm surprised many people don't understand your comment - I had the same thoughts. gRPC provides a very nice way to describe event driven microservices using their "stream" keyword. It allows the implementation to be async, blocking, or future based. You get access to a very rich ecosystem such as bazel's grpc \ proto rules, junit rules, grpc-web for streaming to the browser, out of the box support from istio / envoy, etc.

Looks like Akka Cluster for rust?

I'm surprised that the overall sentiment of the comments indicates that gcloud's offerings are inferior to aws / azure. I've worked with all of the clouds and have found Google to have the best product. Their GKE with built in Istio support is a killer feature. Spanner is best in class. Competitors do not provide a useable alternative to Firestore realtime database. Pizza Hut is the most popular pizza in the USA, doesn't mean it's the best.

Look into Bazel, so far it has been a dream.

You can use apache ignite as a caching layer over your db. (Or as a db itself). You can then register a ContinuousQuery to listen for changes. A grpc service can be stood up to stream these changes to other clients, even front end ones (via grpc-web).