Those are the only reason I am using Redis because not other database easily let you subscribe to notification on change to a specific set of keys.
Getting a system like this right is super hard, and not being OSS, you are at the mercy of the cloud provider to fix issues.
Aerospike recently released their own Redis protocol proxy for Redis . Scylla has their own nascent Redis api driver , would love to get folks feedback on it.
Glommio  (believe it used to be called Scipio) is a thread-per-core framework for Rust modeled after Seastar.
There isn't much in the hn hive mind about it, this one  stands out.
The license to Redis never changed. See his blog post  around the time when his _employer_ announced some license changes on modular extensions to Redis. See also threads on HN .
It's like asking what's the difference between a truck and a Ferrari. They both have engines and steering wheels, right?
But totally different workloads.