@Override
    protected boolean compareAndSetMax(long expect, long update) {
      if (maximumTimestamp != expect) {
        return false;
      }
      maximumTimestamp = update;
      return true;
    }
Returns Make a TimeRange from current state of <code>this</code>.
hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/TimeRangeTracker.java