阿里RocketMQ Quick Start
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
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 {
//订阅PushTopic下Tag为push的消息
consumer.subscribe("PushTopic", "push");
//程序第一次启动从消息队列头取数据
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]]