rocketmq采坑： 连接异常 sendDefaultImpl call timeout

前提：

想使用rocketmq消息队列来做分布式事务处理的demo实验，安装完rocketmq后，并且启动namesrver, broker也成功了，但是使用springboot + rocketmq去连接时出现异常

环境：

centos7（172.xxx.xxx.251），rocketmq4.5.1，

springboot运行异常：

org.apache.rocketmq.remoting.exception.RemotingTooMuchRequestException: sendDefaultImpl call timeout
	at org.apache.rocketmq.client.impl.producer.DefaultMQProducerImpl.sendDefaultImpl(DefaultMQProducerImpl.java:640)
	at org.apache.rocketmq.client.impl.producer.DefaultMQProducerImpl.send(DefaultMQProducerImpl.java:1310)
	at org.apache.rocketmq.client.impl.producer.DefaultMQProducerImpl.send(DefaultMQProducerImpl.java:1256)
	at org.apache.rocketmq.client.producer.DefaultMQProducer.send(DefaultMQProducer.java:339)
	at com.hzy.rocketmq.rocketmqtransaction.client.RocketMQClient.defaultMQProducer(RocketMQClient.java:48)
	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.annotation.InitDestroyAnnotationBeanPostProcessor$LifecycleElement.invoke(InitDestroyAnnotationBeanPostProcessor.java:363)
	at org.springframework.beans.factory.annotation.InitDestroyAnnotationBeanPostProcessor$LifecycleMetadata.invokeInitMethods(InitDestroyAnnotationBeanPostProcessor.java:307)
	at org.springframework.beans.factory.annotation.InitDestroyAnnotationBeanPostProcessor.postProcessBeforeInitialization(InitDestroyAnnotationBeanPostProcessor.java:136)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyBeanPostProcessorsBeforeInitialization(AbstractAutowireCapableBeanFactory.java:414)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1770)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:593)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:515)
	at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:320)
	at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222)
	at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:318)
	at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:199)
	at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:843)
	at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:877)
	at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:549)
	at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:142)
	at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:775)
	at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:397)
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:316)
2019-05-30 11:10:57.343	at org.springframework.boot.SpringApplication.run(SpringApplication.java:1260)
  INFO	at org.springframework.boot.SpringApplication.run(SpringApplication.java:1248)
 3952 	at com.hzy.rocketmq.rocketmqtransaction.RocketmqTransactionApplication.main(RocketmqTransactionApplication.java:10)
--- [lientSelector_1] RocketmqRemoting                         : closeChannel: close the connection to remote address[] result: true

分析：

连接超时，初步猜测

可能原因一：是端口之类的东西没开放，但是查看centos上网路防火墙也未开启，排除端口未开放问题；

可能原因二：broker已经启动成功，可能注册的ip有误

①查看管理页面的集群列表：http://172.xxx.xxx.251:8080/#/cluster，发现broker的地址是10.244.0.11，这个是服务器内网地址

本地使用telnet 10.244.0.1 10911 可以发现明显的无法连接，所以需要修改broker的ip地址

处理：

#进入rocketmq  config目录，添加自定义配置
cd /opt/rocketmq/config/
#编写配置文件，并写好配置
echo "brokerIP1=172.xxx.xxx.251【服务器IP】" > broker.properties
#启动 mqnamesrv 
nohup sh bin/mqnamesrv &

#注意：mrbroker 启动时通过 -c 加载自定义配置文件
nohup sh bin/mqbroker -n 172.xxx.xxx.251:9876 -c /opt/rocketmq/config/broker.properties &

 停止RocketMQ命令
./bin/mqshutdown broker
./bin/mqshutdown namesrv

重启broker后，再次连接rocketmq，程序已经能正常连接了；果然接触新东西还是会踩不少雷

参考连接：https://www.cnblogs.com/smail-bao/p/6905460.html

安装使用可参考：https://www.cnblogs.com/ldy-blogs/p/10452422.html