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Currently, Kafka relies on the operator/caller of kafkaof kafka-storage format on all intended nodes in a cluster to generate consensus on the actual value of clusterID during format time. Additionally, KRaft guarantees that upon forming a given quorum X, X's members will all have the same cluster id (or no cluster id) contained in metain meta.properties. Additionally, when a KRaft node sends a request with a non-null cluster id, this request is only handled if the request's cluster ID matches ID matches the handler's cluster ID.

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