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Why should message consumers be idempotent?

  1. A To improve throughput
  2. B Because at-least-once delivery means the same message may be processed more than once
  3. C To reduce memory usage
  4. D Because messages arrive out of order
Answer

Because at-least-once delivery means the same message may be processed more than once

Most queues guarantee at-least-once rather than exactly-once delivery, so processing a duplicate must not produce a second side effect.

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