When would you choose quorum queues over classic queues?

Quorum queues replicate their data across multiple nodes using the Raft consensus algorithm, trading a bit of overhead for much stronger data-safety guarantees than classic queues.

Choose quorum queues when:

• message loss on node failure is unacceptable (financial transactions, order events, audit trails),
• you need predictable, well-tested failover behavior instead of the older mirrored-queue model,
• the workload is a fairly standard queue/worker pattern rather than something needing per-message priority ordering or very high per-queue throughput at massive fan-out.

Classic queues remain reasonable when a queue is short-lived, non-critical, or extremely high-churn (created/deleted constantly), since quorum queues carry more per-queue overhead due to replication.

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