[PeterCorless]

Yes. They started experimenting with Scylla earlier, and made the switch in 2020. Here's more on their logic — they like "opinionated systems":

https://www.scylladb.com/2019/03/20/discord-on-the-joy-of-op...

[tomnipotent]

Scylla is really impressive. The only complaint I've heard is about the shard-per-cpu approach, causing some issues when data has bad distribution.