zangyk commented on issue #386: 4.3事务消息回查功能 URL: https://github.com/apache/rocketmq/issues/386#issuecomment-409824160 MQClientInstance中是通过topic从nameserver上确定对应哪些的broker的，如果不发消息，MQClientInstance中调用MQProducerInner的getPublishTopicList(),中就没有这个topic的值，获取不到对应的broker，发心跳时也就不会给这些broker发心跳。 也有一种其他处理方法是：producer在start前，设置producer.setCreateTopicKey("topic");这样即使不发消息，MQClientInstance也能知道topic对应的broker，向他们发送心跳，可以在broker注册producer信息，向它发回查消息。
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