Alternatives

Products that do what Chr2 – consensus for side effects (exactly-once is a lie) does

Most consensus libraries (Raft, Paxos) treat the state machine as a pure black box. This is fine until your state machine needs to actually do something, like charge a credit card, fire a webhook, or send an email. If a leader crashes after the side effect but before committing it, you get duplicates. This is my attempt at fixing this problem from first principles ish: build chr2 to make crash-safe side effects first-class citizens. mechanism: Replicated Outbox: Side effects are stored as "pending" in replicated state. Only the leader executes them under a fencing token. Durable Fencing: A…

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