[Enhancement] Optimize error messages when Namesrv address configuration is incorrect

[juhuan]

Before Creating the Enhancement Request

• [X] I have confirmed that this should be classified as an enhancement rather than a bug/feature.

Summary

客户端Namesrv地址配置错误，或者客户端无法连接到Namesrv地址，目前报错：connect to null failed。这个报错信息不够明显，会误导使用者。

用官方ConsumerExample跑：

Exception in thread "main" java.lang.IllegalStateException: org.apache.rocketmq.remoting.exception.RemotingConnectException: connect to null failed
	at org.apache.rocketmq.client.impl.factory.MQClientInstance.updateTopicRouteInfoFromNameServer(MQClientInstance.java:843)
	at org.apache.rocketmq.client.impl.factory.MQClientInstance.updateTopicRouteInfoFromNameServer(MQClientInstance.java:574)
	at org.apache.rocketmq.client.impl.consumer.DefaultMQPushConsumerImpl.updateTopicSubscribeInfoWhenSubscriptionChanged(DefaultMQPushConsumerImpl.java:1247)
	at org.apache.rocketmq.client.impl.consumer.DefaultMQPushConsumerImpl.start(DefaultMQPushConsumerImpl.java:1009)
	at org.apache.rocketmq.client.consumer.DefaultMQPushConsumer.start(DefaultMQPushConsumer.java:730)
	at org.apache.rocketmq.test.client.mq.ConsumerExample.main(ConsumerExample.java:31)
Caused by: org.apache.rocketmq.remoting.exception.RemotingConnectException: connect to null failed
	at org.apache.rocketmq.remoting.netty.NettyRemotingClient.invokeSync(NettyRemotingClient.java:572)
	at org.apache.rocketmq.client.impl.MQClientAPIImpl.getTopicRouteInfoFromNameServer(MQClientAPIImpl.java:2050)
	at org.apache.rocketmq.client.impl.MQClientAPIImpl.getTopicRouteInfoFromNameServer(MQClientAPIImpl.java:2041)
	at org.apache.rocketmq.client.impl.factory.MQClientInstance.updateTopicRouteInfoFromNameServer(MQClientInstance.java:782)
	... 5 more

用官方ProducerExample跑：

java.lang.IllegalStateException: org.apache.rocketmq.remoting.exception.RemotingConnectException: connect to null failed
	at org.apache.rocketmq.client.impl.factory.MQClientInstance.updateTopicRouteInfoFromNameServer(MQClientInstance.java:843)
	at org.apache.rocketmq.client.impl.factory.MQClientInstance.updateTopicRouteInfoFromNameServer(MQClientInstance.java:574)
	at org.apache.rocketmq.client.impl.producer.DefaultMQProducerImpl.tryToFindTopicPublishInfo(DefaultMQProducerImpl.java:887)
	at org.apache.rocketmq.client.impl.producer.DefaultMQProducerImpl.sendDefaultImpl(DefaultMQProducerImpl.java:745)
	at org.apache.rocketmq.client.impl.producer.DefaultMQProducerImpl.send(DefaultMQProducerImpl.java:1564)
	at org.apache.rocketmq.client.impl.producer.DefaultMQProducerImpl.send(DefaultMQProducerImpl.java:1505)
	at org.apache.rocketmq.client.producer.DefaultMQProducer.sendDirect(DefaultMQProducer.java:743)
	at org.apache.rocketmq.client.producer.DefaultMQProducer.send(DefaultMQProducer.java:455)
	at org.apache.rocketmq.test.client.mq.ProducerExample.main(ProducerExample.java:18)
Caused by: org.apache.rocketmq.remoting.exception.RemotingConnectException: connect to null failed
	at org.apache.rocketmq.remoting.netty.NettyRemotingClient.invokeSync(NettyRemotingClient.java:572)
	at org.apache.rocketmq.client.impl.MQClientAPIImpl.getTopicRouteInfoFromNameServer(MQClientAPIImpl.java:2050)
	at org.apache.rocketmq.client.impl.MQClientAPIImpl.getTopicRouteInfoFromNameServer(MQClientAPIImpl.java:2041)
	at org.apache.rocketmq.client.impl.factory.MQClientInstance.updateTopicRouteInfoFromNameServer(MQClientInstance.java:782)
	... 8 more

Motivation

目前无论是控制台还是日志，都无法明确知道这是一个因为Namesrv配置问题导致的报错。“connect to null failed”会令运维费解

Describe the Solution You'd Like

org/apache/rocketmq/client/impl/factory/MQClientInstance.java:843

1. 这里把日志和exception信息统一
2. 把当前的namesrv配置打出来

log.error("updateTopicRouteInfoFromNameServer Exception, namesrvAddr: "+clientConfig.getNamesrvAddr(), e);
throw new IllegalStateException("updateTopicRouteInfoFromNameServer Exception, namesrvAddr: "+clientConfig.getNamesrvAddr(), e);

改进后的报错堆栈如下：

用官方ConsumerExample跑：

Exception in thread "main" java.lang.IllegalStateException: updateTopicRouteInfoFromNameServer Exception, namesrvAddr: 192.9.9.9:19876
	at org.apache.rocketmq.client.impl.factory.MQClientInstance.updateTopicRouteInfoFromNameServer(MQClientInstance.java:843)
	at org.apache.rocketmq.client.impl.factory.MQClientInstance.updateTopicRouteInfoFromNameServer(MQClientInstance.java:574)
	at org.apache.rocketmq.client.impl.consumer.DefaultMQPushConsumerImpl.updateTopicSubscribeInfoWhenSubscriptionChanged(DefaultMQPushConsumerImpl.java:1247)
	at org.apache.rocketmq.client.impl.consumer.DefaultMQPushConsumerImpl.start(DefaultMQPushConsumerImpl.java:1009)
	at org.apache.rocketmq.client.consumer.DefaultMQPushConsumer.start(DefaultMQPushConsumer.java:730)
	at org.apache.rocketmq.test.client.mq.ConsumerExample.main(ConsumerExample.java:31)
Caused by: org.apache.rocketmq.remoting.exception.RemotingConnectException: connect to null failed
	at org.apache.rocketmq.remoting.netty.NettyRemotingClient.invokeSync(NettyRemotingClient.java:572)
	at org.apache.rocketmq.client.impl.MQClientAPIImpl.getTopicRouteInfoFromNameServer(MQClientAPIImpl.java:2050)
	at org.apache.rocketmq.client.impl.MQClientAPIImpl.getTopicRouteInfoFromNameServer(MQClientAPIImpl.java:2041)
	at org.apache.rocketmq.client.impl.factory.MQClientInstance.updateTopicRouteInfoFromNameServer(MQClientInstance.java:782)
	... 5 more

用官方ProducerExample跑：

java.lang.IllegalStateException: updateTopicRouteInfoFromNameServer Exception, namesrvAddr: 192.9.9.9:19876
	at org.apache.rocketmq.client.impl.factory.MQClientInstance.updateTopicRouteInfoFromNameServer(MQClientInstance.java:843)
	at org.apache.rocketmq.client.impl.factory.MQClientInstance.updateTopicRouteInfoFromNameServer(MQClientInstance.java:574)
	at org.apache.rocketmq.client.impl.producer.DefaultMQProducerImpl.tryToFindTopicPublishInfo(DefaultMQProducerImpl.java:887)
	at org.apache.rocketmq.client.impl.producer.DefaultMQProducerImpl.sendDefaultImpl(DefaultMQProducerImpl.java:745)
	at org.apache.rocketmq.client.impl.producer.DefaultMQProducerImpl.send(DefaultMQProducerImpl.java:1564)
	at org.apache.rocketmq.client.impl.producer.DefaultMQProducerImpl.send(DefaultMQProducerImpl.java:1505)
	at org.apache.rocketmq.client.producer.DefaultMQProducer.sendDirect(DefaultMQProducer.java:743)
	at org.apache.rocketmq.client.producer.DefaultMQProducer.send(DefaultMQProducer.java:455)
	at org.apache.rocketmq.test.client.mq.ProducerExample.main(ProducerExample.java:18)
Caused by: org.apache.rocketmq.remoting.exception.RemotingConnectException: connect to null failed
	at org.apache.rocketmq.remoting.netty.NettyRemotingClient.invokeSync(NettyRemotingClient.java:572)
	at org.apache.rocketmq.client.impl.MQClientAPIImpl.getTopicRouteInfoFromNameServer(MQClientAPIImpl.java:2050)
	at org.apache.rocketmq.client.impl.MQClientAPIImpl.getTopicRouteInfoFromNameServer(MQClientAPIImpl.java:2041)
	at org.apache.rocketmq.client.impl.factory.MQClientInstance.updateTopicRouteInfoFromNameServer(MQClientInstance.java:782)
	... 8 more

Describe Alternatives You've Considered

N/a

Additional Context

No response