private static Uuid unsafeRandomUuid() {
        java.util.UUID jUuid = java.util.UUID.randomUUID();
        return new Uuid(jUuid.getMostSignificantBits(), jUuid.getLeastSignificantBits());
    }
Constructs a 128-bit type 4 UUID where the first long represents the most significant 64 bits
and the second long represents the least significant 64 bits.
clients/src/main/java/org/apache/kafka/common/Uuid.java