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Update CheckQuorum and DropIgnoredMessage in ccfraft.tla #7374

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Merged
merged 6 commits into from
Oct 22, 2025
Merged

Update CheckQuorum and DropIgnoredMessage in ccfraft.tla #7374

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566d797
Fix spec
cjen1-msft Oct 17, 2025
76e461d
Merge branch 'main' into fix-spec
achamayou Oct 20, 2025
8deed5f
Update tla/consensus/ccfraft.tla
cjen1-msft Oct 20, 2025
4c36b08
Add backref to raft.h
cjen1-msft Oct 20, 2025
ba6bcde
Merge branch 'main' into fix-spec
achamayou Oct 22, 2025
6284ba4
Merge branch 'main' into fix-spec
achamayou Oct 22, 2025
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5 changes: 5 additions & 0 deletions tla/consensus/ccfraft.tla
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Original file line number Diff line number Diff line change
Expand Up @@ -898,6 +898,9 @@ AdvanceCommitIndex(i) ==
CheckQuorum(i) ==
\* Check node is a leader (and therefore has not completed retirement)
/\ leadershipState[i] = Leader
\* There must be an active config which has a replica which is not this node
/\ \E c \in DOMAIN configurations[i]:
\E n \in configurations[i][c]: n /= i
/\ leadershipState' = [leadershipState EXCEPT ![i] = Follower]
/\ isNewFollower' = [isNewFollower EXCEPT ![i] = TRUE]
/\ UNCHANGED <<reconfigurationVars, messageVars, currentTerm, votedFor, candidateVars, leaderVars, logVars, membershipState>>
Expand Down Expand Up @@ -1177,6 +1180,8 @@ DropIgnoredMessage(i,j,m) ==
\/ /\ leadershipState[i] /= None
\* .. and it comes from a server outside of the configuration
/\ \lnot IsInServerSet(j, i)
\* We specifically don't ignore RequestVoteRequest messages from unknown nodes
/\ m.type \notin {RequestVoteRequest}
\* OR if recipient has completed retirement and this is not a request to vote or append entries request
\* This spec requires that a retired node still helps with voting and appending entries to ensure
\* the next configurations learns that its retirement has been committed.
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