code: public List<RowRange> getTransientRanges() {
      List<RowRange> ranges = new ArrayList<>();
      Iterator<String> keys = appConfig.getKeys(PREFIX.substring(0, PREFIX.length() - 1));
      while (keys.hasNext()) {
        String key = keys.next();
        String val = appConfig.getString(key);
        String[] sa = val.split(":");
        RowRange rowRange = new RowRange(Bytes.of(DatatypeConverter.parseHexBinary(sa[0])),
            Bytes.of(DatatypeConverter.parseHexBinary(sa[1])));
        ranges.add(rowRange);
      }
      return ranges;
    }
docs: This method is expected to be called after Fluo is initialized to get the ranges that were
  registered before initialization.