RocketMQ初入门踩坑记
- 2019 年 10 月 7 日
- 筆記
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~
安装
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/binrocketmq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
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 &管理控制台安装
Git地址：https://github.com/apache/rocketmq-externals/tree/master/rocketmq-console
git clone [email protected]: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();代码示例（官方）
生产者
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(); } } 消费者
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<MessageExt> 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"); } } 有更多的文章，请关注查看，更有面试宝典相送
