RocketMQ初入门踩坑记

本文主要是讲在Centos中安装RocketMQ并做简单的示例。如果你按照本文安装100%是可以成功的，如果按照阿里官方的说明，那只能呵呵了~

官方地址为：https://rocketmq.apache.org/docs/quick-start/
本人安装如下：

//下载最新的rocketmq
wget http://apache-mirror.8birdsvideo.com/rocketmq/4.4.0/rocketmq-all-4.4.0-bin-release.zip

//解压
unzip rocketmq-all-4.4.0-bin-release.zip

//切换到mq目录
cd rocketmq-all-4.4.0-bin-release

//name server 启动
nohup ./bin/mqnamesrv -n 111.231.XX.XX:9876 &

//-c conf/broker.conf autoCreateTopicEnable=true 参数需要带上，不然topic需要手动创建
nohup sh bin/mqbroker -n 111.231.XX.XX:9876 -c conf/broker.conf autoCreateTopicEnable=true &

配置,切换到mq的bin目录下

cd rocketmq-all-4.4.0-bin-release/bin

rocketmq默认最低内存为4g,机器内存不够用的话，找到runserver.sh和runbroker.sh编辑如下：

JAVA_OPT="${JAVA_OPT} -server -Xms256m -Xmx256m -Xmn125m -XX:metaspaceSize=128m -XX:MaxmetaspaceSize=320m"

运行官方demo，发现如下错误：

21:20:22.249 [NettyClientSelector_1] INFO  RocketmqRemoting - closeChannel: close the connection to remote address[] result: true
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 org.apache.rocketmq.example.simple.Producer.main(Producer.java:40)

运行以下命令查看broker配置并写入远程ip地址：

//查看broker配置
sh ./bin/mqbroker -m

//关闭broker
sh bin/mqshutdown broker

//将本机远程ip写入配置文件中
echo 'brokerIP1=111.231.XX.XX' > conf/broker.properties 

//重新启动broker
nohup sh bin/mqbroker -n 111.231.XX.XX:9876 -c conf/broker.conf autoCreateTopicEnable=true &

Git地址：https://github.com/apache/rocketmq-externals/tree/master/rocketmq-console

git clone git@github.com:apache/rocketmq-externals.git
cd  rocketmq-external/rocketmq-console/
mvn clean package -Dmaven.test.skip=true

打完包后，运行以下命令

java -jar rocketmq-console-ng-1.0.1.jar --server.port=12181 --rocketmq.config.namesrvAddr=111.231.XX.XX:9876

打开 http://localhost:12181访问控制台，像如下

在Procuder这个页面查询时会出现如下异常：

java.lang.RuntimeException: org.apache.rocketmq.client.exception.MQBrokerException: CODE: 1  DESC: the producer group[] not exist
For more information, please visit the url, http://rocketmq.apache.org/docs/faq/
 at com.google.common.base.Throwables.propagate(Throwables.java:160)
 at org.apache.rocketmq.console.service.impl.ProducerServiceImpl.getProducerConnection(ProducerServiceImpl.java:38)
 at org.apache.rocketmq.console.controller.ProducerController.producerConnection(ProducerController.java:39)

请把代码中producer.shutdown()这句注掉，生产环境中请加上。

 //producer.shutdown();

package org.apache.rocketmq.example.simple;

import org.apache.rocketmq.client.exception.MQClientException;
import org.apache.rocketmq.client.producer.DefaultMQProducer;
import org.apache.rocketmq.client.producer.SendResult;
import org.apache.rocketmq.common.message.Message;
import org.apache.rocketmq.remoting.common.RemotingHelper;

public class Producer {
    public static void main(String[] args) throws MQClientException, InterruptedException {

 DefaultMQProducer producer = new DefaultMQProducer("ProducerGroupName");

 producer.setNamesrvAddr("111.231.XX.XX:9876");
 producer.start();

 for (int i = 0; i < 10; i++)
     try {
  {
      Message msg = new Message("TopicTest",
   "TagA",
   "OrderID188",
   "Hello world".getBytes(RemotingHelper.DEFAULT_CHARSET));
      SendResult sendResult = producer.send(msg);
      System.out.printf("%s%n", sendResult);
  }

     } catch (Exception e) {
  e.printStackTrace();
     }

 //producer.shutdown();
    }
}

package org.apache.rocketmq.example.simple;

import java.util.List;
import org.apache.rocketmq.client.consumer.DefaultMQPushConsumer;
import org.apache.rocketmq.client.consumer.listener.ConsumeConcurrentlyContext;
import org.apache.rocketmq.client.consumer.listener.ConsumeConcurrentlyStatus;
import org.apache.rocketmq.client.consumer.listener.MessageListenerConcurrently;
import org.apache.rocketmq.client.exception.MQClientException;
import org.apache.rocketmq.common.consumer.ConsumeFromWhere;
import org.apache.rocketmq.common.message.MessageExt;

public class PushConsumer {

    public static void main(String[] args) throws InterruptedException, MQClientException {
 DefaultMQPushConsumer consumer = new DefaultMQPushConsumer("CID_JODIE_1");
 consumer.subscribe("TopicTest", "*");
 consumer.setConsumeFromWhere(ConsumeFromWhere.CONSUME_FROM_FIRST_OFFSET);
 //wrong time format 2017_0422_221800
 //consumer.setConsumeTimestamp("20181109221800");
 consumer.setNamesrvAddr("111.231.XX.XX:9876");
 consumer.registerMessageListener(new MessageListenerConcurrently() {

     @Override
     public ConsumeConcurrentlyStatus consumeMessage(List msgs, ConsumeConcurrentlyContext context) {
  System.out.printf("%s Receive New Messages: %s %n", Thread.currentThread().getName(), msgs);
  return ConsumeConcurrentlyStatus.CONSUME_SUCCESS;
     }
 });
 consumer.start();
 System.out.printf("Consumer Started.%n");
    }
}

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