@Override
    public void clear() {
        Arrays.fill(keys, (byte) 0);
        Arrays.fill(values, null);
        size = 0;
    }
The load factor for the map. Used to calculate {@link #maxSize}.
jraft-rheakv/rheakv-core/src/main/java/com/alipay/sofa/jraft/rhea/util/ByteObjectHashMap.java