hollow/src/main/java/com/netflix/hollow/core/memory/FreeOrdinalTracker.java
public void sort() {
        Arrays.sort(freeOrdinals, 0, size);

        /// reverse the ordering
        int midpoint = size / 2;
        for(int i=0;i<midpoint;i++) {
            int temp = freeOrdinals[i];
            freeOrdinals[i] = freeOrdinals[size-i-1];
            freeOrdinals[size-i-1] = temp;
        }
    }
public void sort() {
        Arrays.sort(freeOrdinals, 0, size);

        /// reverse the ordering
        int midpoint = size / 2;
        for(int i=0;i<midpoint;i++) {
            int temp = freeOrdinals[i];
            freeOrdinals[i] = freeOrdinals[size-i-1];
            freeOrdinals[size-i-1] = temp;
        }
    }
Ensure that all future ordinals are returned in ascending order.