private byte[] getBytesFromUuid() {
        // Extract bytes for uuid which is 128 bits (or 16 bytes) long.
        ByteBuffer uuidBytes = ByteBuffer.wrap(new byte[16]);
        uuidBytes.putLong(this.mostSignificantBits);
        uuidBytes.putLong(this.leastSignificantBits);
        return uuidBytes.array();
    }
Creates a UUID based on a base64 string encoding used in the toString() method.
clients/src/main/java/org/apache/kafka/common/Uuid.java