> ## Documentation Index
> Fetch the complete documentation index at: https://doc.lucidworks.com/llms.txt
> Use this file to discover all available pages before exploring further.

# ZooKeeper

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[localhost link]: http://localhost:3000/docs/5/fusion/intro/fusion-stack/zookeeper

[mintlify link]: https://doc.lucidworks.com/docs/5/fusion/intro/fusion-stack/zookeeper

[old doc.lw link]: https://doc.lucidworks.com/fusion/5.9/3213

[Apache ZooKeeper](http://zookeeper.apache.org/) is a distributed configuration service, synchronization service, and naming registry.
Fusion uses a ZooKeeper [microservice](/docs/5/fusion/reference/microservices) to configure and manage all Fusion components in a single Fusion deployment.

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## ZooKeeper Terms

At a high level, ZooKeeper services consist of the following components:

* **znode.** ZooKeeper data is organized into a hierarchal name space of data nodes called znodes.\
  A znode can have data associated with it as well as child znodes.\
  The data in a znode is stored in a binary format, but it is possible to import, export, and view this information as JSON data.\
  Paths to znodes are always expressed as canonical, absolute, slash-separated paths; there are no relative reference.
* **ephemeral nodes.** An ephemeral node is a znode which exists only for the duration of an active session.\
  When the session ends the znode is deleted. An ephemeral znode cannot have children.
* **server.** A ZooKeeper service consists of one or more machines; each machine is a server which runs in its own JVM and listens on its own set of ports.\
  For testing, you can run several ZooKeeper servers at once on a single workstation by configuring the ports for each server.
* **quorum.** A quorum is a set of ZooKeeper servers. It must be an odd number. For most deployments, only 3 servers are required.
* **client.** A client is any host or process which uses a ZooKeeper service.

The Fusion UI and API handle changes to ZooKeeper’s configuration. See [the ZooKeeper Import/Export API](/api-reference/zookeeper/get-zookeeper-data).

See the official [ZooKeeper documentation](http://zookeeper.apache.org/doc/current/) for details about using and managing a ZooKeeper service.