2259289435 commented on issue #566: Auto create topic question URL: https://github.com/apache/rocketmq/issues/566#issuecomment-582813212 clinet,broker version 4.6.0，if client，broker version not equals，get broker createtopickey first producer： SendMessageHook.sendMessageBefore（final SendMessageContext context） 1. getTopic String newTopic = NamespaceUtil.withoutNamespace(context.getMessage().getTopic()); 2.createTopicForCache createTopicCache.get(newTopic, new Callable<Boolean>() { @Override public Boolean call() throws Exception { Set<String> topicList = context.getProducer().getmQClientFactory().getMQClientAPIImpl().getTopicListFromNameServer(20000L).getTopicList(); if(!topicList.contains(newTopic)) { log.info("producerGroup : {}, newTopic : {} begin autoCreate", context.getProducer().getDefaultMQProducer().getProducerGroup(), newTopic); context.getProducer().getmQClientFactory().getMQAdminImpl().createTopic(MixAllPlus.AUTO_CREATE_TOPIC_KEY_TOPIC, newTopic, DEFAULT_AUTO_CREATE_TOPIC_QUEUE_SIZE); log.info("producerGroup : {}, newTopic : {} end autoCreate", context.getProducer().getDefaultMQProducer().getProducerGroup(), newTopic); } return true; } }); pushconsumer. 1. beforeStart(pushconsumer consumer) //custom method 2. create instance DefaultMQPushConsumerImpl impl = consumer.getDefaultMQPushConsumerImpl(); if (consumer.getMessageModel() == MessageModel.CLUSTERING) { consumer.changeInstanceNameToPID(); } RPCHook rpcHook = ReflectUtil.on(impl).field("rpcHook").get(); MQClientInstance instance = MQClientManager.getInstance().getOrCreateMQClientInstance(consumer, rpcHook); instance.start(); 3.getNewTopic Set<String> newTopics = Sets.newHashSet(); Set<String> topicList = instance.getMQClientAPIImpl().getTopicListFromNameServer(20000L).getTopicList(); for(String topic : impl.getSubscriptionInner().keySet()) { String newTopic = NamespaceUtil.withoutNamespace(topic); if(!topicList.contains(newTopic)) { newTopics.add(newTopic); } } 4.createTopic not thread safe for(String newTopic : newTopics) { log.info("consumerGroup : {}, newTopic : {} begin autoCreate", consumer.getConsumerGroup(), newTopic); instance.getMQAdminImpl().createTopic(instance.getDefaultMQProducer().getCreateTopicKey(), newTopic, DEFAULT_AUTO_CREATE_TOPIC_QUEUE_SIZE); log.info("consumerGroup : {}, newTopic : {} end autoCreate", consumer.getConsumerGroup(), newTopic); }
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