code: public FluoConfiguration setTransactionRollbackTime(long time, TimeUnit tu) {
      return setPositiveLong(TRANSACTION_ROLLBACK_TIME_PROP, tu.toMillis(time));
    }
docs: Sets the transaction rollback time, in milliseconds.
  <p>
  Sets the value of the property {@value #TRANSACTION_ROLLBACK_TIME_PROP}
  
  @param time A long representation of the duration, must be positive
  @param tu The TimeUnit to use