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Tracking mentions began in Dec 2020.
Apache Pegasus – A a distributed key-value storage system
4 projects | news.ycombinator.com | 6 Oct 2022
TiKV is basically a layer on top of rocksdb https://github.com/tikv/tikv/blob/956610725039835557e7516828...
Surrealdb – FOSS document-graph database, for the realtime web in Rust
6 projects | news.ycombinator.com | 16 Sep 2022
> Many,many smart people…
If you look inside the code you can see the stated features are a result of underlying engine (TiKV  also in c and rust from pingcap). Surrealdb is standing on shoulders of giants at present, they are TiKV, FoundationDB and rocksdb. The feature set they mentioned mostly coming from TiKV at present.
Cloud database for tomorrow's applications (written in Rust)
7 projects | news.ycombinator.com | 22 Aug 2022
Hi Diggsey, great question. We are currently focussed on functionality and stability, and then will draw our attention to performance. Coming this week we have a RocksDB storage implementation. We've only just launched our initial beta version, and we know there is a lot of improvement and work to be done (some of these performance issues we know about already and are on our Github issues list).
With regards to the consistency/isolation model, SurrealDB sits on top of a number of key-value stores. By using the distributed highly-available TiKV storage backend, https://tikv.org, (and we have a FoundationDB integration in the works), the database is designed to be highly-scalable and highly-available. The same guarantees (albeit just single-node, so no high-availability or scalability) will be available with the RocksDB implementation coming this week. By sitting on top of these key-value stores, SurrealDB ensures that all transactions are ACID compliant. We don't want to go for speed (for instance by writing to /dev/null) over anything, but want SurrealDB to be a reliable and performant backend for any application. Obviously we have a way to go to catch up with PostgreSQL (launched in 1996), but we will strive to get there!
CeresDB: A high-performance, distributed, schema-less and time-series database
3 projects | news.ycombinator.com | 15 Jun 2022
If you are looking for a production ready distributed store written in Rust. Check out TiKV(https://github.com/tikv/tikv), which was also mentioned in the acknowledge section of the project's README.
There's also a full-featured distributed RDBMS called TiDB built on top of TiKV.
Fly.io – Free Postgres Databases (and free storage volumes, up to 3GB total)
6 projects | news.ycombinator.com | 20 Jan 2022
Fair enough. Indeed I didn't consider support costs. Thank you for your answer!
Actually let me ask another thing. Your FAQ mentions you're considering hosting CockroachDB as a drop-in distributed replacement for PostgreSQL , and also you currently offer a distributed, eventually consistent PostgreSQL replication solution .
Is either Tikv  (distributed key-value store) or Tidb  (distributed database with a mysql interface, built on top of Tikv) on your radar?
You already offer Redis as a key-value store, but Tikv has an amazing property: it ensures strong consistency globally (not eventual consistency). Tidb, being built on top of Tikv, also has strong consistency.
NoSQL and Key-Value storage systems based on Rust (Redis and Tarantool replacements in Rust)
10 projects | reddit.com/r/rust | 17 Dec 2021
tikv — A distributed KV database in Rust
Belajar Rust 01 - Mengenal Bahasa Pemrograman Rust
6 projects | dev.to | 28 Aug 2021
TiKV: basis data key-value transaksional yang terdistribusi.
Dive Deep into TiKV Transactions: The Life Story of a TiKV Prewrite Request
2 projects | dev.to | 23 Aug 2021
Before I introduce this phase, I'd like to talk about the batch system. It is the cornerstone of TiKV's multi-raft implementation.2 projects | dev.to | 23 Aug 2021
TiKV is a distributed key-value storage engine, which is based on the designs of Google Spanner, F1, and HBase. However, TiKV is much simpler to manage because it does not depend on a distributed file system.
8 projects | news.ycombinator.com | 11 Aug 2021
What are some alternatives?
redis-rs - Redis library for rust
rust-etcd - An etcd client library for Rust.
rust-rocksdb - rust wrapper for rocksdb
cassandra-rs - Cassandra (CQL) driver for Rust, using the DataStax C/C++ driver under the covers.
rust-postgres - Native PostgreSQL driver for the Rust programming language
diesel - A safe, extensible ORM and Query Builder for Rust
rusqlite - Ergonomic bindings to SQLite for Rust
KeyDB - A Multithreaded Fork of Redis
arrow-datafusion - Apache Arrow DataFusion SQL Query Engine
rust-sqlite3 - Rustic bindings for sqlite3