RocketMQ单机支持1万以上的持久化队列，前提是足够的内存、硬盘空间，过期数据数据删除（RocketMQ中的消息队列长度不是无限的，只是足够大的内存+数据定时删除）
RocketMQ版本：3.1.4
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一，部署NameServer：
1，安装JDK并设置JAVA_HOME环境变量（启动脚本依赖JAVA_HOME环境变量）
2，cd /alibaba-rocketmq/bin进入RocketMQ的bin目录
2，调用nohup sh mqnamesrv &启动NameServer
报错如下：
- : command not found
- : command not found
- mqnamesrv: line 35: syntax error: unexpected end of file
在bin目录下调用dos2unix *将所有文件转化为unix格式，再次调用nohup sh mqnamesrv &
报错如下：
- /home/hadoop/alibaba-rocketmq
- Invalid initial heap size: -Xms4g
- The specified size exceeds the maximum representable size.
- Could not create the Java virtual machine.
由于安装的JDK版本为32位，4g超过了JDK所支持的最大内存，不过32位JDK也无法发挥出RocketMQ的优势，换成64位JDK
这次启动成功
- [hadoop@hadoop bin]$ nohup sh mqnamesrv &
- [1] 17676
- [hadoop@hadoop bin]$ nohup: appending output to “nohup.out”
-
- [hadoop@hadoop bin]$ cat nohup.out
- The Name Server boot success.
- [hadoop@hadoop bin]$ jps
- 17682 NamesrvStartup
- 17800 Jps
NameServer监听端口：9876
- nettyServerConfig.setListenPort(9876);
如果服务器内存不够，可以修改runserver.sh脚本（mqnamesrv文件中通过runserver.sh脚本调用Name Server的主函数com.alibaba.rocketmq.namesrv.NamesrvStartup启动Name Server）中的JAVA_OPT_1参数
- JAVA_OPT_1="-server -Xms4g -Xmx4g -Xmn2g -XX:PermSize=128m -XX:MaxPermSize=320m"
二，部署Broker：消息中转角色，负责存储消息，转发消息
Broker集群有多种配置方式：
1，单Master
优点：除了配置简单没什么优点
缺点：不可靠，该机器重启或宕机，将导致整个服务不可用
2，多Master
优点：配置简单，性能最高
缺点：可能会有少量消息丢失（配置相关），单台机器重启或宕机期间，该机器下未被消费的消息在机器恢复前不可订阅，影响消息实时性
3，多Master多Slave，每个Master配一个Slave，有多对Master-Slave，集群采用异步复制方式，主备有短暂消息延迟，毫秒级
优点：性能同多Master几乎一样，实时性高，主备间切换对应用透明，不需人工干预
缺点：Master宕机或磁盘损坏时会有少量消息丢失
4，多Master多Slave，每个Master配一个Slave，有多对Master-Slave，集群采用同步双写方式，主备都写成功，向应用返回成功
优点：服务可用性与数据可用性非常高
缺点：性能比异步集群略低，当前版本主宕备不能自动切换为主
Master和Slave的配置文件参考conf目录下的配置文件
Master与Slave通过指定相同的brokerName参数来配对，Master的BrokerId必须是0，Slave的BrokerId必须是大于0的数
一个Master下面可以挂载多个Slave，同一Master下的多个Slave通过指定不同的BrokerId来区分
部署一Master一Slave，集群采用异步复制方式：
Master：
- [hadoop@hadoop bin]$ nohup sh mqbroker -n "192.168.58.163:9876" -c ../conf/2m-2s-async/broker-a.properties &
- [2] 25493
- [hadoop@hadoop bin]$ nohup: appending output to “nohup.out”
-
- [hadoop@hadoop bin]$ cat nohup.out
- load config properties file OK, ../conf/2m-2s-async/broker-a.properties
- The broker[broker-a, 192.168.58.163:10911] boot success. and name server is 192.168.58.163:9876
- [hadoop@hadoop bin]$ jps
- 25500 BrokerStartup
- 25545 Jps
- 17682 NamesrvStartup
Slave：
- [hadoop@hadoop bin]$ nohup sh mqbroker -n "192.168.58.163:9876" -c ../conf/2m-2s-async/broker-a-s.properties &
- [1] 1974
- [hadoop@hadoop bin]$ nohup: appending output to “nohup.out”
-
- [hadoop@hadoop bin]$ cat nohup.out
- load config properties file OK, ../conf/2m-2s-async/broker-a-s.properties
- The broker[broker-a, 192.168.58.164:10911] boot success. and name server is 192.168.58.163:9876
- [hadoop@hadoop bin]$ jps
- 2071 Jps
- 1981 BrokerStartup
Broker监听端口：10911
- nettyServerConfig.setListenPort(10911);
如果服务器内存不够，可以修改runbroker.sh脚本（mqbroker文件中通过runbroker.sh脚本调用Broker的主函数com.alibaba.rocketmq.broker.BrokerStartup启动Broker）的JAVA_OPT_1参数
- JAVA_OPT_1="-server -Xms4g -Xmx4g -Xmn2g -XX:PermSize=128m -XX:MaxPermSize=320m"
三，Producer
必须要设置Name Server地址
- package com.sean;
-
- import com.alibaba.rocketmq.client.producer.DefaultMQProducer;
- import com.alibaba.rocketmq.client.producer.SendResult;
- import com.alibaba.rocketmq.common.message.Message;
-
- public class Producer {
- public static void main(String[] args){
- DefaultMQProducer producer = new DefaultMQProducer("Producer");
- producer.setNamesrvAddr("192.168.58.163:9876");
- try {
- producer.start();
-
- Message msg = new Message("PushTopic",
- "push",
- "1",
- "Just for test.".getBytes());
-
- SendResult result = producer.send(msg);
- System.out.println("id:" + result.getMsgId() +
- " result:" + result.getSendStatus());
-
- msg = new Message("PushTopic",
- "push",
- "2",
- "Just for test.".getBytes());
-
- result = producer.send(msg);
- System.out.println("id:" + result.getMsgId() +
- " result:" + result.getSendStatus());
-
- msg = new Message("PullTopic",
- "pull",
- "1",
- "Just for test.".getBytes());
-
- result = producer.send(msg);
- System.out.println("id:" + result.getMsgId() +
- " result:" + result.getSendStatus());
- } catch (Exception e) {
- e.printStackTrace();
- }finally{
- producer.shutdown();
- }
- }
- }
四，Consumer
必须要设置Name Server地址
- package com.sean;
-
- import java.util.List;
-
- import com.alibaba.rocketmq.client.consumer.DefaultMQPushConsumer;
- import com.alibaba.rocketmq.client.consumer.listener.ConsumeConcurrentlyContext;
- import com.alibaba.rocketmq.client.consumer.listener.ConsumeConcurrentlyStatus;
- import com.alibaba.rocketmq.client.consumer.listener.MessageListenerConcurrently;
- import com.alibaba.rocketmq.common.consumer.ConsumeFromWhere;
- import com.alibaba.rocketmq.common.message.Message;
- import com.alibaba.rocketmq.common.message.MessageExt;
-
- public class Consumer {
- public static void main(String[] args){
- DefaultMQPushConsumer consumer =
- new DefaultMQPushConsumer("PushConsumer");
- consumer.setNamesrvAddr("192.168.58.163:9876");
- try {
-
- consumer.subscribe("PushTopic", "push");
-
- consumer.setConsumeFromWhere(
- ConsumeFromWhere.CONSUME_FROM_FIRST_OFFSET);
- consumer.registerMessageListener(
- new MessageListenerConcurrently() {
- public ConsumeConcurrentlyStatus consumeMessage(
- List<MessageExt> list,
- ConsumeConcurrentlyContext Context) {
- Message msg = list.get(0);
- System.out.println(msg.toString());
- return ConsumeConcurrentlyStatus.CONSUME_SUCCESS;
- }
- }
- );
- consumer.start();
- } catch (Exception e) {
- e.printStackTrace();
- }
- }
- }
先运行Consumer，然后运行Producer
Producer运行结果：
- id:C0A83AA300002A9F00000000000009EA result:SEND_OK
- id:C0A83AA300002A9F0000000000000A77 result:SEND_OK
- id:C0A83AA300002A9F0000000000000B04 result:SEND_OK
Consumer运行结果：
- MessageExt [queueId=1, storeSize=141, queueOffset=6, sysFlag=0, bornTimestamp=1403765668792, bornHost=/192.168.31.130:60985, storeTimestamp=1403765527374, storeHost=/192.168.58.163:10911, msgId=C0A83AA300002A9F0000000000000A77, commitLogOffset=2679, bodyCRC=753746584, reconsumeTimes=0, preparedTransactionOffset=0, toString()=Message [topic=PushTopic, flag=0, properties={TAGS=push, KEYS=2, WAIT=true, MAX_OFFSET=7, MIN_OFFSET=0}, body=14]]
- MessageExt [queueId=0, storeSize=141, queueOffset=6, sysFlag=0, bornTimestamp=1403765668698, bornHost=/192.168.31.130:60985, storeTimestamp=1403765527356, storeHost=/192.168.58.163:10911, msgId=C0A83AA300002A9F00000000000009EA, commitLogOffset=2538, bodyCRC=753746584, reconsumeTimes=0, preparedTransactionOffset=0, toString()=Message [topic=PushTopic, flag=0, properties={TAGS=push, KEYS=1, WAIT=true, MAX_OFFSET=7, MIN_OFFSET=0}, body=14]]
