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Terminology
Terminology
We use the term “migration” here to refer to the process of changing a Kafka cluster’s metadata system from ZooKeeper to KRaft and migrating existing metadata. An “upgrade” refers to installing a newer version of Kafka. It is not recommended to upgrade the software at the same time as performing a metadata migration.
We also use the term “ZK mode” to refer to Kafka brokers which are using ZooKeeper as their metadata system. “KRaft mode” refers Kafka brokers which are using a KRaft controller quorum as their metadata system.
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