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However, cockroachdb does all other work (including query execution) in Go too.

There's also DGraph based on Badger as a storage engine which is an all-go stack.

And badger does compare favorably to rocksdb under certain workloads.

> Note that neither CockroachDB [...] use Golang for their actual storage engine

We do, now. We're looking to move away from RocksDB to https://github.com/cockroachdb/pebble/.

Woah, that's big news. Thanks for sharing.

VictoriaMetrics [1] is written entirely in Go. By default it uses canonical zstd library for compression (the library is written in C), but it supports pure Go mode when built with `make victoria-metrics-pure`. In this mode it uses zstd implementation written in Go [2].

[1] https://github.com/VictoriaMetrics/VictoriaMetrics

[2] https://github.com/klauspost/compress/tree/master/zstd#zstd