Re: [tlaplus] Re: How does TLC expand search?

[Hillel Wayne <hwayne@xxxxxxxxx>]

Hi Shiyao

related code:

VoteFor(a, b, v) ==
    /\ maxBal[a] =< b
    /\ \A vt \in votes[a] : vt[1] /= b
    /\ \A c \in Acceptor \ {a} :
         \A vt \in votes[c] : (vt[1] = b) => (vt[2] = v)
    /\ \E Q \in Quorum : ShowsSafeAt(Q, b, v)
    /\ votes'  = [votes EXCEPT ![a] = votes[a] \cup {<<b, v>>}]
    /\ maxBal' = [maxBal EXCEPT ![a] = b]

If VoteFor specifies maxBal', and IncreaseMaxBal specifies maxBal', then they can only be true that the same time if there is some value for maxBal' that satisfies both actions.

Given TLC isn't giving you an error, I'm guessing you also have UNCHANGED votes in IncreaseMaxBal? Then they definitely both can't be true at the same time, as VoteFor would specify that votes changes and IncreaseMaxBal does not.

H

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