@Override
      public boolean accept(File dir, String name) {
        return name.endsWith(Index_File_Name_Suffix);
      }
@param offsetUpto - the entries upto this offset are put into rangeMap, rest are put into offRangeMap
@return the last offset in the rangeMap.
@throws Exception
ambry-tools/src/main/java/com/github/ambry/store/HardDeleteVerifier.java