code: public synchronized void resetAll(long value, long maxScn) throws IOException {
        resetAll(value);
        
        _log.info("update hwmScn and lwmScn:" + maxScn);
        writeHwmScn(maxScn);
        writeLwmScn(maxScn);
        flush();
    }
docs: Resets all element values to the specified long value the max SCN (System Change Number)..
  
  @param value  - the element value.
  @param maxScn - the system change number for the low and high water marks.
  @throws IOException