public void rollbackBackupLog(UUID txnId) {
        TxBackupLog log = txBackupLogs.get(txnId);
        if (log == null) {
            logger.warning("No tx backup log is found, tx -> " + txnId);
        } else {
            log.state = ROLLING_BACK;
        }
    }
@Test
    public void rollbackBackupLog_whenNotExist_thenIgnored() {
        txService.rollbackBackupLog(TXN);
    }