@SuppressFBWarnings(value = "EI_EXPOSE_REP2", justification = "intended")
  public void addDiskRange(DiskRangeList diskRange) {
    if (tail == null) {
      head = tail = diskRange;
    } else {
      tail = tail.insertAfter(diskRange);
    }
    totalLength += diskRange.getLength();
  }
Disk range information class containing disk ranges and total length.
storage-api/src/java/org/apache/hadoop/hive/common/DiskRangeInfo.java