onethin opened a new issue #1112: 4.3.0客户端连接4.4.0服务端报错No route info of this topic URL: https://github.com/apache/rocketmq/issues/1112 **BUG REPORT** 1. 4.4.0服务端，4.3.0客户端，首次使用新topic发送消息报错： Exception in thread "main" org.apache.rocketmq.client.exception.MQClientException: No route info of this topic, test-topic2 See http://rocketmq.apache.org/docs/faq/ for further details. at org.apache.rocketmq.client.impl.producer.DefaultMQProducerImpl.sendDefaultImpl(DefaultMQProducerImpl.java:610) at org.apache.rocketmq.client.impl.producer.DefaultMQProducerImpl.send(DefaultMQProducerImpl.java:1223) at org.apache.rocketmq.client.impl.producer.DefaultMQProducerImpl.send(DefaultMQProducerImpl.java:1173) at org.apache.rocketmq.client.producer.DefaultMQProducer.send(DefaultMQProducer.java:214) at com.test.Application.main(Application.java:29) 2. 服务端环境为RHEL 7.6 X64，oracle jdk version 1.8.0_191 x64 3. 如果使用4.4.0客户端能正常发送消息，而且4.4.0客户端成功发送消息后再用4.3.0客户端发送相同topic的消息可以发送成功。即在4.3.0客户端连接4.4.0服务端的情况下首次发送不能创建新的topic
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