I'm not convinced. Java I/O is far form perfect, and Kafka is probably very heavy on I/O side.

> and usually faster than e.g. Go.

That's strange, since Go to some degree was intended as replacement for Java without having Java's downsides. Why would Go be less performant?

I'd be interested if someone would write such framework in Rust though. C++ is of course a default expectation, but usage of Java somehow surprises me in this case.