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What happens when a network comes to a consensus about a transaction, but that transaction fails to get applied on some nodes but not all nodes?

A more concrete example is createAccount operation. When some nodes apply the operation and add a new account but some others don't, what happens? And I don't mean it in terms of bad quorum configurations. What happens when there's, for example, a database failure or any kind of systematic failure when applying operations?

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The rules for applying transactions are deterministic, so any validator that fails a transaction that should have succeeded is ill-behaved. SCP survives ill-behaved nodes so long as there is a well-behaved quorum U in which nodes enjoy quorum intersection after removing all nodes not in U from everyone's quorum slices.

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  • As a node that failed to apply a set of transactions without purposefully being malicious, what measurements are taken to roll back the changes or reapply the transactions?
    – B.Li
    Oct 15, 2018 at 22:44
  • If your node is faulty, it needs to be replaced. But note that there's a distinction between just failing to apply transactions because you crashed, and falsely claiming that the transactions failed (and you increased sequence numbers, charged fees, etc.). The former is self-correcting by restarting stellar-core, while the latter indicates your node is faulty and needs to be replaced.
    – user3188445
    Oct 16, 2018 at 0:39

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