[jdc0589]

I've seen people try and do it. It involves each service replicating copies of the data from every service it's dependent on (via CDC streams on kafka/whatever) in its own datastores and reading directly from its copy of data rather than actually calling the source-of-truth service.

There are some instances where that kind of thing is necessary, but...insane amount of clear downsides so your problem statement for doing it had better be pretty compelling.

[nullandvoid]

This is typically referred to event carried state transfer for anyone curious.

The premise being high service availability and low latency to serve requests (no need to talk to source of truth) with the tradeoffs of higher storage / processing costs and from my experience higher complexity.