We use RocksDB as the single-machine storage engine and build TiKV above RocksDB as a distributed storage engine. At first we consider use Go to build TiKV, but

We use RocksDB as the single-machine storage engine and build TiKV above RocksDB as a distributed storage engine. At first we consider use Go to build TiKV, but the cgo overhead between TiKV and Rocksdb is considerable. So we turn to Rust. The network communication overhead between TiDB and TiKV has nothing to do with cgo.