ZooKeeper

The separate coordination service older Kafka clusters used to store their metadata.

Kafka 4.0 removed ZooKeeper mode: clusters now keep their metadata in KRaft, a log replicated among controller nodes. Exam questions about ZooKeeper usually test that you know it is gone and what replaced it.

Related terms

• kraft
• kafka-controller
• metadata

Certification courses

• CCDAK and CCAAK course and practice exams: Confluent Apache Kafka certifications