Compared to prior systems that achieve strict serializable multi-shard transactions, ACCORD achieves optimal
performance by utilizing real time timestamps and a message reorder buffer. Unlike Tempo, ACCORD does not rely
on additional periodic broadcast mechanisms for timestamp stability, and commutative commands do not interfere.
Importantly, ACCORD addresses the poor fast-path stability of existing systems by introducing a configurable fast-path
electorate. This provides optimal failure tolerance and consistent performance under any number of tolerated failures.
ACCORD is the first leaderless protocol that is sufficiently stable for practical use in a large scale industrial database system. Finally, to the best of our knowledge, no commercial or open-source database systems offer strict serializable transactions across regions in a single wide area round-trip.
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