private boolean casFirstUnCommittedOffset(long currentValue, long newValue) {
    return INT64_OVER_BYTE_BUFFER.compareAndSet(
      headerPage.rawPageBuffer(),
      HeaderLayout.NEXT_RECORD_TO_BE_COMMITTED_OFFSET,
      currentValue, newValue
    );
  }
private boolean casFirstUnCommittedOffset(long currentValue, long newValue)