code: public long getNodeChangedSize(String nodePath)
     {
        long nodeDelta = 0;
  
        Iterator<ChangesItem> changes = iterator();
        while (changes.hasNext())
        {
           nodeDelta += changes.next().getNodeChangedSize(nodePath);
        }
  
        return nodeDelta;
     }
docs: Return changed size for particular node accumulated during
  some period.