On: Moving 25TB data from one S3 bucket to another too...

[lmm]

Buck up and learn enough Java to write this basic program. It's really not a particularly complex or hard language.

[ed25519FUUU → lmm]

(Sarcasm) You should “buck up” and learn Rust or C. With a real language you won’t have to deal with the overhead of a runtime and will really be able to saturate the resources.

[lmm → ed25519FUUU]

I can and have written Rust, C, and indeed Ruby where warranted. Surely any self-respecting programmer would do the same?

[CydeWeys → lmm]

How's that significantly different from the Ruby tool they did write?

[lmm → CydeWeys]

Java libraries don't tend to break in the presence of multithreading the way Ruby ones do.