# Apache ZooKeeper

**Canonical:** https://apis.io/providers/apache-zookeeper/  
**Website:** https://zookeeper.apache.org/  
**APIs profiled:** 6

Apache ZooKeeper is a centralized service for maintaining configuration information, naming, providing distributed synchronization, and providing group services for distributed systems. It provides a hierarchical key-value store (znodes), watches for change notifications, ephemeral nodes for presence detection, and sequential nodes for leader election and distributed locking. ZooKeeper exposes a Java/C client API and an HTTP Admin Server API for monitoring and management. It is widely used by Kafka, Hadoop, HBase, Storm, and other distributed systems.

## Kin Score — 37.6 / 100 (thin)

Scored 2026-08-20 under rubric 0.12.0. Trend: flat (+0.0 from 37.6).

| Facet | Score |
|---|---|
| Discoverability | 64.8 |
| Contract Quality | 48.3 |
| Governance | 13.6 |
| Contract Governance | 13.6 |
| Operational Transparency | 23.7 |
| Developer Ergonomics | 42.9 |
| Commercial Clarity | 28.6 |
| Access Clarity | 28.6 |

## Agent readiness — 31.6 (agent-aware)

| Dimension | Value |
|---|---|
| Spec Presence | yes |
| Agentic Access | derived |
| Reversibility Documented | na |
| MCP Server | no |
| Auth Clarity | no |
| Idempotency | na |
| Error Semantics | no |
| OpenAPI Examples | verified |
| Rate Limit Signal | documented |
| Event Surface Described | no |
| Agent Skills | no |
| Well Known Catalog | no |
| Consent Identity | no |
| Agent Card | no |
| Dry Run Mode | na |

## Access

Freemium — onboarding: unknown, pricing: freemium, trial: no (confidence: medium).

## APIs (6)

- **Apache ZooKeeper Client API** — The ZooKeeper client API provides Java and C language bindings for distributed coordination operations. Operations include create (create znodes), delete, exists (check existenc...
- **Apache ZooKeeper Cluster API** — Cluster and ensemble information
- **Apache ZooKeeper Configuration API** — Server configuration information
- **Apache ZooKeeper Health API** — Server health checks
- **Apache ZooKeeper Monitoring API** — Server statistics and metrics
- **Apache ZooKeeper Watches API** — ZooKeeper watch information

## Agentic access (1)

- **Apache Zookeeper Agentic Access** — 21 operations

## Security (2)

- **Apache Zookeeper Domain Security** — TLSv1.3 · HSTS · DMARC
- **Apache Zookeeper Vulnerability Disclosure** — security.txt · contact published

## Plans (1)

- **Apache Zookeeper Plans Pricing**

## Use cases (5)

- **Leader Election** — Distributed leader election using ephemeral sequential znodes for coordination.
- **Distributed Configuration Management** — Centralized configuration storage with watch-based change notification to services.
- **Service Registry and Discovery** — Service registration and lookup using ephemeral znodes as presence indicators.
- **Distributed Locking** — Distributed mutex and read/write locks using ephemeral sequential znode recipes.
- **Cluster Coordination** — Kafka broker coordination, HBase region server management, and Hadoop NameNode fencing.

## Tags

Configuration Management, Distributed Coordination, Leader Election, Service Discovery, Open-Source

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Profiled by [API Evangelist](https://apievangelist.com) and published on [APIs.io](https://apis.io/providers/apache-zookeeper/). Scores are computed from the provider's own public artifacts under a published rubric.