Zab

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ZooKeeper Atomic Broadcast — the consensus protocol used by Apache ZooKeeper. Designed specifically for primary-backup replication with total order broadcast. Ensures all state changes are delivered in the same order to all replicas. Simpler than Paxos for the leader-based replication use case.

Key Properties

• Atomic Broadcast
• Primary-Backup Model
• Total Order Delivery

Related

• Raft (similar leader-based approach)
• Leader Election (Zab includes leader election)

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distributed-systems consensus