Overview of KubeBlocks ZooKeeper Addon

Apache ZooKeeper is a centralized service for:

Maintaining configuration information
Providing distributed naming and synchronization
Delivering group services for distributed applications

ZooKeeper is widely used as a coordination backbone for systems like Apache Kafka, Apache HBase, and other distributed frameworks.

The KubeBlocks ZooKeeper Addon provides a complete solution for deploying and managing ZooKeeper clusters in Kubernetes environments. Key features include:

Ensemble-based deployment with leader/follower topology
Comprehensive lifecycle management
Reliable backup and restore operations
Support for multiple ZooKeeper versions

Key Features

Lifecycle Management

KubeBlocks simplifies ZooKeeper operations with comprehensive lifecycle management:

Feature	Description
Horizontal Scaling	Scale ensemble members in/out to adjust capacity
Vertical Scaling	Adjust CPU/memory resources for ZooKeeper instances
Volume Expansion	Dynamically increase storage capacity without downtime
Restart Operations	Controlled cluster restarts with minimal disruption
Start/Stop	Temporarily suspend/resume cluster operations
Dynamic Configuration	Modify ZooKeeper parameters without full restart
Monitoring	Integrated Prometheus metrics collection via built-in exporter

Backup and Restore

KubeBlocks supports backup and restore for ZooKeeper using the ZooCreeper tool:

Backup Type	Method	Description
Full Backup	zoocreeper	Copies ZooKeeper data tree snapshots to a backup repository

Supported Versions

KubeBlocks ZooKeeper Addon supports these versions:

Major Version	Supported Minor Versions
ZooKeeper 3	3.4.14, 3.6.4, 3.7.2, 3.8.4, 3.9.2, 3.9.4

The list of supported versions can be found by running:

kubectl get cmpv zookeeper