@Override
  public synchronized E get(int index) {
    return list.get(index);
  }
Returns a reference to the unmodifiable list currently backing the SortedList. Changes to the
SortedList will not be reflected in this list. Use this method to get a reference for iterating
over using the RandomAccess pattern.
hbase-server/src/main/java/org/apache/hadoop/hbase/util/SortedList.java