Apache ZooKeeper
A centralized coordination service for distributed systems providing configuration management, leader election, distributed locking, and service discovery
Paxos Made Simple
Paxos is the foundational consensus algorithm that enables distributed systems to agree on values despite failures — the theoretical bedrock behind Google Chubby, Apache ZooKeeper, and every modern consensus protocol.
Raft Consensus Algorithm (Ongaro/Ousterhout) Summary
Raft protocol explained for interviews: leader election + log replication. RequestVote/AppendEntries, Raft vs Paxos, etcd/Consul use. Read now.