zangyk commented on issue #386: 4.3事务消息回查功能 URL: https://github.com/apache/rocketmq/issues/386#issuecomment-409818581 大概知道什么原因了,producer在start()后,必须发一条消息,本地MQClientInstance类通过topic获得该topic的路由信息,知道对应哪些broker,broker上才能注册这个producer到相应的producerGroup下,才能收到回查消息。如果只是start(),而不发送一条消息,这个producer是收不到回查消息的。这种处理方式也不知道好不好,如果业务上真有start后,很长时间没有其他消息的情况,是不是就收不到之前消息的回查信息了?
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