004 rocketmq集群

1、集群模式

在RocketMQ中，集群的部署模式是比较多的，有以下几种：

java 复制代码

public class ConsumerDemo {
    public static void main(String[] args) throws Exception {
        DefaultMQPushConsumer consumer = new DefaultMQPushConsumer("test-group");
        consumer.setNamesrvAddr("172.16.55.185:9876");
        // 订阅topic，接收此Topic下的所有消息
        consumer.subscribe("my-test-topic", "*");
        consumer.registerMessageListener(new MessageListenerConcurrently() {
            @Override
            public ConsumeConcurrentlyStatus consumeMessage(List<MessageExt> msgs,
                                                            ConsumeConcurrentlyContext context) {
                for (MessageExt msg : msgs) {
                    try {
                        System.out.println(new String(msg.getBody(), "UTF-8"));
                    } catch (UnsupportedEncodingException e) {
                        e.printStackTrace();
                    }
                }
                System.out.println("收到消息->" + msgs);
                if (msgs.get(0).getReconsumeTimes() >= 3) {
                    // 重试3次后，不再进行重试
                    return ConsumeConcurrentlyStatus.CONSUME_SUCCESS;
                }
                return ConsumeConcurrentlyStatus.RECONSUME_LATER;
            }
        });
        consumer.start();
    }
}

单个Master 这种方式风险较大，一旦Broker重启或者宕机时，会导致整个服务不可用，不建议线上环境使用。多

Master模式一个集群无Slave，全是Master，例如2个Master或者3个Master 单台机器宕机期间，这台机器上未被消

费的消息在机器恢复之前不可订阅，消息实时性会受到影响。多Master多Slave模式，异步复制每个Master配置一

个Slave，有多对Master-Slave，HA采用异步复制方式，主备有短暂消息延迟，毫秒级。优点：即使磁盘损坏，消

息丢失的非常少，且消息实时性不会受影响，因为Master宕机后，消费者仍然可以从Slave消费，此过程对应用透

明，不需要人工干预。性能同多Master模式几乎一样。缺点：Master宕机，磁盘损坏情况，会丢失少量消息。多

Master多Slave模式，同步双写每个Master配置一个Slave，有多对Master-Slave，HA采用同步双写方式，主备都写

成功，向应用返回成功。优点：数据与服务都无单点，Master宕机情况下，消息无延迟，服务可用性与数据可用性

都非常高。缺点：性能比异步复制模式略低，大约低10%左右。

2、搭建2m2s集群

下面通过docker搭建2master+2slave的集群。

#创建2个master

#nameserver1

bash 复制代码

docker create -p 9876:9876 --name rmqserver01 \
-e "JAVA_OPT_EXT=-server -Xms128m -Xmx128m -Xmn128m" \
-e "JAVA_OPTS=-Duser.home=/opt" \
foxiswho/rocketmq:server-4.5.1

#nameserver2

bash 复制代码

docker create -p 9877:9876 --name rmqserver02 \
-e "JAVA_OPT_EXT=-server -Xms128m -Xmx128m -Xmn128m" \
-e "JAVA_OPTS=-Duser.home=/opt" \
foxiswho/rocketmq:server-4.5.1

#创建第1个master broker

#master broker01

bash 复制代码

docker create --net host --name rmqbroker01 \
-e "JAVA_OPTS=-Duser.home=/opt" \
-e "JAVA_OPT_EXT=-server -Xms128m -Xmx128m -Xmn128m" \
foxiswho/rocketmq:broker-4.5.1

#配置

bash 复制代码

namesrvAddr=172.16.55.185:9876;172.16.55.185:9877
brokerClusterName=testCluster
brokerName=broker01
brokerId=0
deleteWhen=04
fileReservedTime=48
brokerRole=SYNC_MASTER
flushDiskType=ASYNC_FLUSH
brokerIP1=172.16.55.185
brokerIp2=172.16.55.185
listenPort=10911

#创建第2个master broker

#master broker02

bash 复制代码

docker create --net host --name rmqbroker02 \
-e "JAVA_OPTS=-Duser.home=/opt" \
-e "JAVA_OPT_EXT=-server -Xms128m -Xmx128m -Xmn128m" \
foxiswho/rocketmq:broker-4.5.1

#master broker02

bash 复制代码

namesrvAddr=172.16.55.185:9876;172.16.55.185:9877
brokerClusterName=testCluster
brokerName=broker02
brokerId=0
deleteWhen=04
fileReservedTime=48
brokerRole=SYNC_MASTER
flushDiskType=ASYNC_FLUSH
brokerIP1=172.16.55.185
brokerIp2=172.16.55.185
listenPort=10811

#创建第1个slave broker

#slave broker01

bash 复制代码

docker create --net host --name rmqbroker03 \
-e "JAVA_OPTS=-Duser.home=/opt" \
-e "JAVA_OPT_EXT=-server -Xms128m -Xmx128m -Xmn128m" \
foxiswho/rocketmq:broker-4.5.1

#slave broker01

bash 复制代码

namesrvAddr=172.16.55.185:9876;172.16.55.185:9877
brokerClusterName=testCluster
brokerName=broker01
brokerId=1
deleteWhen=04
fileReservedTime=48
brokerRole=SLAVE
flushDiskType=ASYNC_FLUSH
brokerIP1=172.16.55.185
brokerIp2=172.16.55.185
listenPort=10711

#创建第2个slave broker

#slave broker01

bash 复制代码

docker create --net host --name rmqbroker04 \
-e "JAVA_OPTS=-Duser.home=/opt" \
-e "JAVA_OPT_EXT=-server -Xms128m -Xmx128m -Xmn128m" \
foxiswho/rocketmq:broker-4.5.1

#slave broker02

bash 复制代码

namesrvAddr=172.16.55.185:9876;172.16.55.185:9877
brokerClusterName=testCluster
brokerName=broker02
brokerId=1
deleteWhen=04
fileReservedTime=48
brokerRole=SLAVE
flushDiskType=ASYNC_FLUSH
brokerIP1=172.16.55.185
brokerIp2=172.16.55.185
listenPort=10611

#启动容器

bash 复制代码

docker start rmqserver01 rmqserver02
docker start rmqbroker01 rmqbroker02 rmqbroker03 rmqbroker04