public void arrowDown() {
    if (currentPosition < recordsSize - 1) {
      currentPosition += 1;
      if (pageSize > 0) {
        keepConsistent();
      }
    }
  }
Utility class for paging for the metrics.
hbase-hbtop/src/main/java/org/apache/hadoop/hbase/hbtop/screen/top/Paging.java