Coordination Services: ZooKeeper, etcd, & Consul
Compare distributed coordination backbones: Hierarchical key-value trees, watch triggers, leases, and consensus engine comparisons.
01.1. What are Distributed Coordination Services?
Building distributed primitivesβsuch as atomic compare-and-swap, distributed locks, leader election, dynamic configuration updates, and service discoveryβfrom scratch is notoriously error-prone.
Distributed Coordination Services (such as Apache ZooKeeper, etcd, and HashiCorp Consul) provide a hardened, highly available, strongly consistent small-data storage backbone running proven consensus algorithms (Raft, ZAB).
Core Primitives Provided:
- Atomic Compare-and-Swap (CAS): Update a key only if its current revision matches the expected version.
- Leases / Ephemeral Nodes: Keys that automatically delete if the client fails to refresh its heartbeat session (used for failure detection and leader election).
- Watches / Event Streams: Subscribing to key prefixes to receive real-time notifications when values mutate, eliminating inefficient polling.
- Linearizable Reads & Writes: Guaranteed strong consistency across all cluster nodes.
Coordination Services Comparison βοΈ
Coordination Services Comparison βοΈ
Key architectural characteristics of ZooKeeper, etcd, and Consul.
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