当broker配置autoCreateTopicEnable=false，rocketmq日志出现大量MQClientException: CODE: 17

[ziyunmuxu]

分析是对象池中MQClientInstance定时线程updateTopicRouteInfoFromNameServer，会默认扫描TBW102，但是对于broker配置autoCreateTopicEnable=false，并没有生成TBW102的topic，不知道这种的日志中不停出现告警信息，有什么处理方式没有？

具体告警日志如下：
2021-04-28 10:34:33 WARN MQClientFactoryScheduledThread - updateTopicRouteInfoFromNameServer Exception
org.apache.rocketmq.client.exception.MQClientException: CODE: 17 DESC: No topic route info in name server for the topic: TBW102
See http://rocketmq.apache.org/docs/faq/ for further details.
at org.apache.rocketmq.client.impl.MQClientAPIImpl.getTopicRouteInfoFromNameServer(MQClientAPIImpl.java:1385)
at org.apache.rocketmq.client.impl.MQClientAPIImpl.getTopicRouteInfoFromNameServer(MQClientAPIImpl.java:1355)
at org.apache.rocketmq.client.impl.factory.MQClientInstance.updateTopicRouteInfoFromNameServer(MQClientInstance.java:622)
at org.apache.rocketmq.client.impl.factory.MQClientInstance.updateTopicRouteInfoFromNameServer(MQClientInstance.java:509)
at org.apache.rocketmq.client.impl.factory.MQClientInstance.updateTopicRouteInfoFromNameServer(MQClientInstance.java:358)
at org.apache.rocketmq.client.impl.factory.MQClientInstance$3.run(MQClientInstance.java:275)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:308)
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(ScheduledThreadPoolExecutor.java:180)
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:294)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at java.lang.Thread.run(Thread.java:748)

[gaoyf]

两种解决方案
1.自己创建TBW102 topic。
2.修改rocketmq client的这行代码：

this.topicPublishInfoTable.put(this.defaultMQProducer.getCreateTopicKey(), new TopicPublishInfo());

修改为如下即可：

if (defaultMQProducer.isFetchAutoCreateTopicRouteInfo()) {
    this.topicPublishInfoTable.put(this.defaultMQProducer.getCreateTopicKey(), new TopicPublishInfo());
}
在DefaultMQProducer定义一个变量
// 是否抓取自动创建topic的路由信息
private boolean fetchAutoCreateTopicRouteInfo;

另外，这个异常是由于#1985引入的，主要是这个代码：

我感觉官方merge代码时review不经过测试。。。，你这个问题应该在rocketmq社区提。