关于在docker中消费消息的问题。

部署环境：单机docker 部署方式：2个nameServer、2个Master、2个slave

操作步骤：

1、创建一个生产者，队列数量采用默认的4个，代码如下：

public static void main(String[] args) throws Exception { //Instantiate with a producer group name. DefaultMQProducer producer = new DefaultMQProducer("group_test"); // Specify name server addresses. producer.setNamesrvAddr("192.168.1.6:9876:192.168.1.6:9877"); //Launch the instance. producer.start(); int i = 0; while (true) { //Create a message instance, specifying topic, tag and message body. Message msg = new Message("TopicTestL" /* Topic /, "TagA" / Tag /, ("Hello RocketMQ " + i).getBytes(RemotingHelper.DEFAULT_CHARSET) / Message body */ ); //Call send message to deliver message to one of brokers. SendResult sendResult = producer.send(msg); System.out.printf("%s%n", sendResult); Thread.sleep(1000); } //Shut down once the producer instance is not longer in use. //producer.shutdown(); }

2、创建两个消费者，代码如下：

private static void consume(String instanceName) throws MQClientException { // Instantiate with specified consumer group name. DefaultMQPushConsumer consumer = new DefaultMQPushConsumer("group_test"); // Specify name server addresses. consumer.setNamesrvAddr("192.168.1.6:9876:192.168.1.6:9877"); consumer.setInstanceName(instanceName); // Subscribe one more more topics to consume. consumer.subscribe("TopicTestL", "*"); consumer.setConsumerGroup("group_test"); // Register callback to execute on arrival of messages fetched from brokers. consumer.registerMessageListener(new MessageListenerConcurrently() { @Override public ConsumeConcurrentlyStatus consumeMessage(List msgs, ConsumeConcurrentlyContext context) { for (MessageExt m: msgs) { System.out.println("consume:" + instanceName + ",QueueId:" + m.getQueueId()); } return ConsumeConcurrentlyStatus.CONSUME_SUCCESS; } }); //Launch the consumer instance. consumer.start(); System.out.printf("Consumer Started.%n"); }

两个消费者分别从不同的进程或者线程启动，看到打印的消费记录如下：

consume:consume1,QueueId:0 consume:consume1,QueueId:1 consume:consume1,QueueId:2 consume:consume1,QueueId:3 consume:consume2,QueueId:0 consume:consume2,QueueId:1 consume:consume2,QueueId:2 consume:consume2,QueueId:3

问题：为什么每个消费者会消费到每个队列，或者说为什么一个消息队列会被多个消费者消费。（注意：消息本身是没有被重复消费），我期望的是每个消费者只消费一部分队列，每个消费队列一段时间只被一个消费者消费，是否我操作有误，还是设计如此？求解答，谢谢。

原提问者GitHub用户brucevoin