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If you compare Cassandra and ScyllaDB, the garbage collection causes serious problem with 99.9% latency.

Only because Java is yet to support value types.

In languages like Nim and D, where all C++ allocation mechanisms are available alongside a GC heap, there are plenty of ways to improve performance.

The whole point of scylladb, which the author has extensively worked on, is that we can be a lot faster without garbage collection.

"Slow is Smooth, Smooth is Fast"[1]

Especially when the lifecycle cost of the corner case debugging is folded in.

…which has its own issues, of course.