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ZooKeeper

Category
Databases and data
Latest
3.9.7
Released
Oct 30, 2026
Docs outline
12 sections

Official docs outline

zookeeper.apache.org
  1. ZooKeeper Overview

    Coordination service, data model, znodes, watches and guarantees.

  2. Getting Started

    Running standalone and replicated ZooKeeper and basic commands.

  3. Programmer's Guide

    Znodes, ephemeral nodes, watches, ACLs, sessions and consistency.

  4. Recipes and Solutions

    Locks, queues, barriers and leader election.

  5. Administrator's Guide

    Deployment, configuration parameters and maintenance.

  6. Internals

    Atomic broadcast (Zab), leader election and logging.

  7. Dynamic Reconfiguration

    Changing ensemble membership at runtime.

  8. Observers

    Non-voting servers for scaling reads.

  9. Quotas

    Limiting znode counts and sizes.

  10. Authentication and Authorization

    ACLs and authentication schemes.

  11. Monitoring and JMX

    Metrics and four-letter-word commands.

  12. CLI

    zkCli commands.

Each section links to the official page. Titles and summaries by Extra Credit; the docs belong to their authors.

Versions and support

6 release lines
LineReleasedLatestSupport
3.9 Jul 19, 2023 3.9.7 Supported
3.8 Feb 25, 2022 3.8.8 Supported
3.7 Mar 17, 2021 3.7.2 Ended Jan 19, 2024
3.6 Feb 25, 2020 3.6.4 Ended Dec 30, 2022
3.5 May 3, 2019 3.5.10 Ended Jun 1, 2022
3.4 Nov 23, 2011 3.4.14 Ended Jun 1, 2020

Source: endoflife.date

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