[karmakaze]

That's a whole category of software that makes large systems work: etcd, Zookeeper, HashiCorp Vault, etc.

[latchkey]

Yes! All built with redundancy in mind.

https://etcd.io/docs/v3.3/op-guide/

https://zookeeper.apache.org/doc/r3.9.3/zookeeperStarted.htm...

https://developer.hashicorp.com/vault/tutorials/day-one-raft