@VisibleForTesting
  public static String deleteDeltaSubdir(long min, long max) {
    return DELETE_DELTA_PREFIX + String.format(DELTA_DIGITS, min) + "_" +
        String.format(DELTA_DIGITS, max);
  }
This is format of delete delta dir name prior to Hive 2.2.x
ql/src/java/org/apache/hadoop/hive/ql/io/AcidUtils.java