Apache Kafka KRaft - Kafka 存储工具

Question

in the documentation it is mentioned that:

As described above in the QuickStart section, you must use the kafka-storage.sh tool to generate a cluster ID for your new cluster, and then run the format command on each node before starting the node.

Generate a cluster ID

./bin/kafka-storage.sh random-uuid
xtzWWN4bTjitpL3kfd9s5g

Format Storage Directories

./bin/kafka-storage.sh format -t <uuid> -c ./config/kraft/server.properties
Formatting /tmp/kraft-combined-logs

would be it a problem to generate the <uuid> with a different program and not with the kafka-storage.sh one?

Answer 1

It needs to be a type-4 UUID that doesn't match Kafka's internal UUIDs

From Kafka source-code

    /**
     * Static factory to retrieve a type 4 (pseudo randomly generated) UUID.
     */
    public static Uuid randomUuid() {
        java.util.UUID uuid = java.util.UUID.randomUUID();
        while (uuid.equals(METADATA_TOPIC_ID_INTERNAL) || uuid.equals(ZERO_ID_INTERNAL)) {
            uuid = java.util.UUID.randomUUID();
        }
        return new Uuid(uuid.getMostSignificantBits(), uuid.getLeastSignificantBits());
    }