DefaultMQPushConsumer start invokSync call timeout

When DefaultMQPushConsumer start when inject in a springboot container，it throws a ivokeSync call timeout. If Thread.sleep ahead of the start(), the exception does not be trowed. How to solve the problem.

            consumer = new DefaultMQPushConsumer(consumerGroupName);
            consumer.setNamesrvAddr(nameServerAddr);
            consumer.setConsumeTimeout(1000000);
            consumer.setConsumeFromWhere(ConsumeFromWhere.CONSUME_FROM_FIRST_OFFSET);
            consumer.subscribe(topicName, "*");
            consumer.registerMessageListener(messageListener);
            //Thread.sleep(3000);
            consumer.start();

Caused by: java.lang.IllegalStateException: org.apache.rocketmq.remoting.exception.RemotingTimeoutException: invokeSync call timeout at org.apache.rocketmq.client.impl.factory.MQClientInstance.updateTopicRouteInfoFromNameServer(MQClientInstance.java:681) at org.apache.rocketmq.client.impl.factory.MQClientInstance.updateTopicRouteInfoFromNameServer(MQClientInstance.java:511) at org.apache.rocketmq.client.impl.consumer.DefaultMQPushConsumerImpl.updateTopicSubscribeInfoWhenSubscriptionChanged(DefaultMQPushConsumerImpl.java:868) at org.apache.rocketmq.client.impl.consumer.DefaultMQPushConsumerImpl.start(DefaultMQPushConsumerImpl.java:649) at org.apache.rocketmq.client.consumer.DefaultMQPushConsumer.start(DefaultMQPushConsumer.java:693) at XXX.MQConsumer.init(MQConsumer.java:58) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:498) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeCustomInitMethod(AbstractAutowireCapableBeanFactory.java:1922) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1864) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1792) … 16 common frames omitted Caused by: org.apache.rocketmq.remoting.exception.RemotingTimeoutException: invokeSync call timeout at org.apache.rocketmq.remoting.netty.NettyRemotingClient.invokeSync(NettyRemotingClient.java:371) at org.apache.rocketmq.client.impl.MQClientAPIImpl.getTopicRouteInfoFromNameServer(MQClientAPIImpl.java:1371) at org.apache.rocketmq.client.impl.MQClientAPIImpl.getTopicRouteInfoFromNameServer(MQClientAPIImpl.java:1361) at org.apache.rocketmq.client.impl.factory.MQClientInstance.updateTopicRouteInfoFromNameServer(MQClientInstance.java:624) … 28 common frames omitted

[RongtongJin]

From the exception stack, it seems that the consumer connection to nameserver has timed out. Is nameserver and consumer started at the same time? In addition, it is recommended to use rocketmq-spring, if you want quickly integrate RocketMQ with Spring Boot.

[heihaozi]

Add the following code before consumer.start();:

DefaultChannelId.newInstance();

The exception will not be thrown.

使用这个方法成功了，这个是什么原因，楼主知道吗

In the static code block of DefaultChannelId, it takes a lot of time to obtain the corresponding IP by using the host name, and it may have passed 5 seconds in a portable mac notebook computer.

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