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by std_reply 529 days ago
TiDB has four main components:

1. SQL front end nodes 2. Distributed shared nothing storage (TiKV) 3. Meta data server (PS) 4. TiFlash column store

1 and 3 are written in Go 2 is written in Rust and uses RocksDB 4 is written in C++

2 & 3 are graduated CNCF projects maintained by PingCAP.

Disclaimer: I work for PingCAP