Blogs

1. https://blog.yugabyte.com/how-does-consensus-based-replication-work-in-distributed-databases/
2. https://news.ycombinator.com/item?id=19343698
3. https://severalnines.com/resources/database-management-tutorials/galera-cluster-mysql-tutorial
4. https://news.ycombinator.com/item?id=19343698
5. https://www.percona.com/live/plam16/sites/default/files/slides/Patroni%20PLAM_0.pdf

Implementation

Etcd 2.3

1. https://github.com/etcd-io/etcd/tree/release-2.3
2. https://github.com/etcd-io/etcd/blob/release-2.3/Documentation/clustering.md
3. Easy to build and modify.

Rqlite

1. https://github.com/rqlite/rqlite

Dqlite

1. https://github.com/canonical/dqlite

TIKV

1. https://github.com/tikv/tikv

Galera Cluster

1. https://github.com/codership/galera

Postgres/Raft

1. https://github.com/zalando/patroni

Toy implementation

1. https://github.com/kkdai/paxos