Parallel execution of the saga

[mariobittencourt]

Hi, first of all thank you for the code and article.

There is one part of it that, if I understood correctly, should not be happening. The definition of your state machine uses parallel execution. From Catie's paper, there is explicit mention that if Transaction i has been executed then i-1 has already been acknowledged.

In parallel execution, you lose this guarantee. What do you think about it?