lizhiboo commented on issue #3179:
URL: https://github.com/apache/rocketmq/issues/3179#issuecomment-887241232
> The version is 4.9.0.
> First of all, If set the autoCreateTopicEnable = false，when start the
broker, the broker won't register the topic "TBW102" to the nameserver（See the
constructor of TopicConfigManager, the line 70）
>
> ```
> if (this.brokerController.getBrokerConfig().isAutoCreateTopicEnable()) {
> String topic = TopicValidator.AUTO_CREATE_TOPIC_KEY_TOPIC;
> TopicConfig topicConfig = new TopicConfig(topic);
> TopicValidator.addSystemTopic(topic);
>
topicConfig.setReadQueueNums(this.brokerController.getBrokerConfig()
> .getDefaultTopicQueueNums());
>
topicConfig.setWriteQueueNums(this.brokerController.getBrokerConfig()
> .getDefaultTopicQueueNums());
> int perm = PermName.PERM_INHERIT | PermName.PERM_READ |
PermName.PERM_WRITE;
> topicConfig.setPerm(perm);
> this.topicConfigTable.put(topicConfig.getTopicName(),
topicConfig);
> }
> ```
>
> Second, when start a consumer, it will create a DefaultMQProducer in the
MQClintInstance, and will register the producer into the
producerTable(MQClientInstance.start line 244), and register the TBW102 to the
DefaultMQProducerImpl's topicPublishInfoTable（DefaultMQProducerImpl line 207）
> the entry code is:
>
> ```
> this.defaultMQProducer.getDefaultMQProducerImpl().start(false);
> ```
>
> and the register code is (DefaultMQProducerImpl.start() line 199 line 207):
>
> ```
> boolean registerOK =
mQClientFactory.registerProducer(this.defaultMQProducer.getProducerGroup(),
this);
> if (!registerOK) {
> this.serviceState = ServiceState.CREATE_JUST;
> throw new MQClientException("The producer group[" +
this.defaultMQProducer.getProducerGroup()
> + "] has been created before, specify another name
please." + FAQUrl.suggestTodo(FAQUrl.GROUP_NAME_DUPLICATE_URL),
> null);
> }
>
>
this.topicPublishInfoTable.put(this.defaultMQProducer.getCreateTopicKey(), new
TopicPublishInfo());
> ```
>
> So, when the MQClientInstance scheduled executes the method
updateTopicRouteInfoFromNameServer, it will put the 'TBW102' topic to the
topicList, see MQClientInstance.updateTopicRouteInfoFromNameServer line 347
>
> ```
> // Producer
> {
> Iterator<Entry<String, MQProducerInner>> it =
this.producerTable.entrySet().iterator();
> while (it.hasNext()) {
> Entry<String, MQProducerInner> entry = it.next();
> MQProducerInner impl = entry.getValue();
> if (impl != null) {
> Set<String> lst = impl.getPublishTopicList();
> topicList.addAll(lst);
> }
> }
> }
> ```
>
> the code above will put the topic of TBW102 to the topicList, the next
code update every topic in the topic list.
>
> I don't know whether do i describe clearly.
I got it, start DefaultMQProducerImpl will put TBW102 to topicPublishTable
indeed. Do u have any suggestion to fix this problem friendly?
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