public static <V> ConcurrentMap<Long, V> newConcurrentMapLong(int initialCapacity) {
        return new ConcurrentHashMap<>(initialCapacity);
    }
Creates a {@code ConcurrentHashMap} instance, with a high enough "initial capacity"
that it should hold {@code expectedSize} elements without growth.
jraft-rheakv/rheakv-core/src/main/java/com/alipay/sofa/jraft/rhea/util/Maps.java