On the other hand, now we have duckdb for all the “small big data”, and a slew of 10-100x faster than Java equivalent stuff in the data x rust ecosystem, like DataFusion, Feldera, ByteWax, RisingWave, Materialize etc
I call BS on those Rust 10-100x claims. Rust and Java are roughly equal in performance. It is just that there are a lot of old NoSQL frameworks in Java which are trash. I also checked out those companies, some of which are doing interesting stuff. None claim things are 100x faster because of Rust. You just hurt your credibility when you say such clearly false things. That's how you end up with a Hadoop cluster which is 236x slower than a batch script.
PS None of the companies you linked seem to be using a datapath architecture which is the key to the highest level of performance
The point of the article is those don’t actually work that well.
I guarantee those rust projects have spent more time playing with rust and library design than the domain problem they are trying to solve.