@Override
    public boolean setTimestamp(final long timestamp) {
      final int fieldOffsetInPage = recordOffsetInPage + TIMESTAMP_OFFSET;
      if (pageBuffer.getLong(fieldOffsetInPage) != timestamp) {
        pageBuffer.putLong(fieldOffsetInPage, timestamp);
        return true;
      }
      return false;
    }
@Override
    public boolean setTimestamp(final long timestamp)