RocketMQ单机部署流程

1.下载源码包
地址 http://rocketmq.apache.org/docs/quick-start/

unzip rocketmq-all-4.4.0-source-release.zip
cd rocketmq-all-4.4.0/
mvn -Prelease-all -DskipTests clean install -U
cd distribution/target/apache-rocketmq
使用maven打包源码包
完成后在distribution/target/apache-rocketmq目录下找到生成的文件

2.修改linux Hosts
vi /etc/hosts

添加
172.19.24.103 rocketmq-nameserver1
172.19.24.103 rocketmq-master1
nameserver和master映射关系

3.建立RocketMQ目录

mkdir /usr/local/apache-rocketmq
cp apache-rocketmq.tar.gz /usr/local/apache-rocketmq
cd /usr/local/apache-rocketmq
tar -zxvf apache-rocketmq.tar.gz
ln -s apache-rocketmq rocketmq

4.创建存储路径
mkdir /usr/local/rocketmq/store
mkdir /usr/local/rocketmq/store/commitlog
mkdir /usr/local/rocketmq/store/consumequeue
mkdir /usr/local/rocketmq/store/index

5.修改RocketMQ配置文件
vi /usr/local/rocketmq/conf/2m-2s-async/broker-a.properties

内容如下

集群名称

brokerClusterName=rocketmq-cluster

brokerName=broker-a

brokerId=0

namesrvAddr=rocketmq-nameserver1:9876

defaultTopicQueueNums=4

autoCreateTopicEnable=true

autoCreateSubScriptionGroup=true

listenPosr=10911

deleteWhen=04

fileReservedTime=120

mapedFileSizeCommitLog=1073741824

mapedFileSizeConsumeQueue=300000

diskMaxUsedSpaceRatio=88

storePathRootDir=/usr/local/rocketmq/store

storePathCommitLog=/usr/local/rocketmq/store/commitLog

storePathConsumeQueue=/usr/local/rocketmq/store/consumequeue

storePathIndex=/usr/local/rocketmq/store/index

storeCheckpooint=/usr/local/rocketmq/store/checkpoint

abortFile=/usr/local/rocketmq/store/abort

maxMessageSize=65536

brokerRole=ASYNC_MASTER

flushDiskType=ASYNC_FLUSH

6.修改日志文件路径
mkdir -p /usr/local/rocketmq/logs
cd /usr/local/rocketmq/conf
sed -i 's#${user.home}#/usr/local/rocketmq#g' *.xml

7.修改启动脚本参数(主要防止配置内存过大，本地机器内存不够用，生产另说)
vi /usr/local/rocketmq/bin/runbroker.sh
修改jvm内存为最大，最小，新生代为1g
vi /usr/local/rocketmq/bin/runserver.sh
修改jvm内存为最大，最小，新生代为1g

8.启动
cd /usr/local/rocketmq/bin/
先启动 NameServer
nohup sh mqnamesrv &

再启动 broker
nohup sh mqbroker -c /usr/local/rocketmq/conf/2m-2s-async/broker-a.properties > /dev/null 2>&1 &

9.查看日志
broker 日志
tail -f /usr/local/rocketmq/logs/rocketmqlogs/broker.log
tail -f /usr/local/rocketmq/logs/rocketmqlogs/namesrv.log

RocketMQ生产者使用

    public static void main(String[] args) throws MQClientException, RemotingException, InterruptedException, MQBrokerException {
        DefaultMQProducer producer = new DefaultMQProducer("testQuickStart");
        producer.setNamesrvAddr(Const.NAME_SERVER_ADDR);
        producer.start();

        for (int i = 0; i < 5; i++) {
            Message message = new Message("test_quick_topic", "TagA", "Keys" + i, ("Hello RocketMQ"  + i).getBytes());
            SendResult res = producer.send(message);
            System.out.println("消息发送结果" + res);
        }
        producer.shutdown();
    }
}

运行代码可以发现Topic和Queue是一对多的关系，一个Topic发送多条消息会落到不同queueId的队列中去

消费端：

public class Consumer {

    public static void main(String[] args) throws MQClientException {
        DefaultMQPushConsumer consumer = new DefaultMQPushConsumer("test_quick_consumer_name");
        consumer.setNamesrvAddr(Const.NAME_SERVER_ADDR);
        consumer.setConsumeFromWhere(ConsumeFromWhere.CONSUME_FROM_LAST_OFFSET);

        consumer.subscribe("test_quick_topic", "*");

        consumer.registerMessageListener(new MessageListenerConcurrently() {
            @Override
            public ConsumeConcurrentlyStatus consumeMessage(List<MessageExt> list, ConsumeConcurrentlyContext consumeConcurrentlyContext) {
                MessageExt messageExt = list.get(0);

                try {
                    String topic = messageExt.getTopic();
                    String msgId = messageExt.getMsgId();
                    String body = new String(messageExt.getBody(), RemotingHelper.DEFAULT_CHARSET);
                    System.out.println("topic "  + topic + " msgId "  + msgId + " body "  + body);
                    int i =  1 / 0;
                } catch (Exception e) {
                    e.printStackTrace();
                    int reconsumeTimes = messageExt.getReconsumeTimes();
                    System.out.println("reconsumeTimes " + reconsumeTimes);
                    if (reconsumeTimes == 3) {
                        return ConsumeConcurrentlyStatus.CONSUME_SUCCESS;
                    }
                    return ConsumeConcurrentlyStatus.RECONSUME_LATER;
                }
                return ConsumeConcurrentlyStatus.CONSUME_SUCCESS;
            }
        });
        consumer.start();
    }
}

可以看到RocketMQ会有自动重试机制，在捕获异常时RocketMQ Broker可以进行消息重发。

至此，完成了单机RocketMQ的搭建和简单生产者消费者的demo运行。