code: public Transaction startShort(int timeoutInSeconds) {
      Preconditions.checkArgument(timeoutInSeconds > 0, "timeout must be positive but is %s", timeoutInSeconds);
      txMetricsCollector.rate("start.short");
      Stopwatch timer = new Stopwatch().start();
      long expiration = getTxExpiration(timeoutInSeconds);
      Transaction tx = startTx(expiration, TransactionType.SHORT);
      txMetricsCollector.histogram("start.short.latency", (int) timer.elapsedMillis());
      return tx;
    }
docs: Start a short transaction with a given timeout.
  @param timeoutInSeconds the time out period in seconds.