dongdongzld commented on issue #122: how to make the consumer idempotency URL: https://github.com/apache/rocketmq-spring/issues/122#issuecomment-522386450 大部分情况下，我们都需要对消息去重，从而实现幂等，但系统没有提供任何扩展点来做这个事情，虽然可以在 public void onMessage(MessageExt messageExt) 内实现，感觉不太优雅，有大量的重复代码
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