讨论： 至多一次、至少一次与恰好一次投递
记录
Calling exactly-once 'a property of the whole pipeline' is correct, but the article underplays that some systems do provide transactional producers and consumers within their own boundary, which removes the deduplication burden for pipelines that stay inside that system. The idempotent-consumer advice remains right at the edges; inside a single system's transactions it is redundant work.
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