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阿里rocketmq,有广泛的应用场景,订单,交易,充值,流计算,消息推送,日志流式处理,binglog分发等多个业务领域。
已正式成为apache项目,也于年前刚发布4.0.0版本,本文初试服务端和客户端
1 服务端安装
1.0 安装准备
CentOS release 6.8 (Final)
- 64bit OS, Linux/Unix/Mac is recommended;
- 64bit JDK 1.7+;
- Maven 3.2.x
- Git
1.1 编译
> git clone https://github.com/apache/incubator-rocketmq.git
> cd incubator-rocketmq
> mvn clean package install -Prelease-all assembly:assembly -U
> cd target/apache-rocketmq-all/
1.2 启动NameServer
> nohup sh bin/mqnamesrv &
> tail -f ~/logs/rocketmqlogs/namesrv.log
The Name Server boot success...
1.3 启动Broker
> nohup sh bin/mqbroker -n localhost:9876 &
> tail -f ~/logs/rocketmqlogs/broker.log
The broker[%s, 172.30.30.233:10911] boot success...
2 客户端
2.1 客户示例客户端
运行生产者producer
> export NAMESRV_ADDR=localhost:9876
> sh bin/tools.sh org.apache.rocketmq.example.quickstart.Producer
SendResult [sendStatus=SEND_OK, msgId= ...
运行消费者
> sh bin/tools.sh org.apache.rocketmq.example.quickstart.Consumer
ConsumeMessageThread_%d Receive New Messages: [MessageExt...
2.2 java客户端编写
pom.xmlsg
4.0.0-incubating
org.apache.rocketmq rocketmq-client ${rocketmq.version} org.apache.rocketmq rocketmq-all ${rocketmq.version}
生产者
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 java.util.concurrent.TimeUnit; public class Producer { public static void main(String[] args) throws MQClientException, InterruptedException { /** * 一个应用创建一个Producer,由应用来维护此对象,可以设置为全局对象或者单例
* 注意:ProducerGroupName需要由应用来保证唯一
* ProducerGroup这个概念发送普通的消息时,作用不大,但是发送分布式事务消息时,比较关键, * 因为服务器会回查这个Group下的任意一个Producer */ DefaultMQProducer producer = new DefaultMQProducer("ProducerGroupName"); producer.setNamesrvAddr("192.168.56.101:9876"); producer.setInstanceName("Producer"); producer.setVipChannelEnabled(false); /** * Producer对象在使用之前必须要调用start初始化,初始化一次即可
* 注意:切记不可以在每次发送消息时,都调用start方法 */ producer.start(); /** * 下面这段代码表明一个Producer对象可以发送多个topic,多个tag的消息。 * 注意:send方法是同步调用,只要不抛异常就标识成功。但是发送成功也可会有多种状态,
* 例如消息写入Master成功,但是Slave不成功,这种情况消息属于成功,但是对于个别应用如果对消息可靠性要求极高,
* 需要对这种情况做处理。另外,消息可能会存在发送失败的情况,失败重试由应用来处理。 */ for (int i = 0; i < 1; i++) { try { { Message msg = new Message("TopicTest1",// topic "TagA",// tag "OrderID001",// key ("Hello MetaQ").getBytes());// body SendResult sendResult = producer.send(msg); System.out.println(sendResult); } { Message msg = new Message("TopicTest2",// topic "TagB",// tag "OrderID0034",// key ("Hello MetaQ").getBytes());// body SendResult sendResult = producer.send(msg); System.out.println(sendResult); } { Message msg = new Message("TopicTest3",// topic "TagC",// tag "OrderID061",// key ("Hello MetaQ").getBytes());// body SendResult sendResult = producer.send(msg); System.out.println(sendResult); } } catch (Exception e) { e.printStackTrace(); } TimeUnit.MILLISECONDS.sleep(1000); } /** * 应用退出时,要调用shutdown来清理资源,关闭网络连接,从MetaQ服务器上注销自己 * 注意:我们建议应用在JBOSS、Tomcat等容器的退出钩子里调用shutdown方法 */ producer.shutdown(); } }
消费者
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.message.MessageExt; import java.util.List; public class PushConsumer { /** * 当前例子是PushConsumer用法,使用方式给用户感觉是消息从RocketMQ服务器推到了应用客户端。
* 但是实际PushConsumer内部是使用长轮询Pull方式从MetaQ服务器拉消息,然后再回调用户Listener方法
*/ public static void main(String[] args) throws InterruptedException, MQClientException { /** * 一个应用创建一个Consumer,由应用来维护此对象,可以设置为全局对象或者单例
* 注意:ConsumerGroupName需要由应用来保证唯一 */ DefaultMQPushConsumer consumer = new DefaultMQPushConsumer( "ConsumerGroupName"); consumer.setNamesrvAddr("192.168.56.101:9876"); consumer.setInstanceName("Consumber"); /** * 订阅指定topic下tags分别等于TagA或TagC或TagD */ consumer.subscribe("TopicTest1", "TagA || TagC || TagD"); /** * 订阅指定topic下所有消息
* 注意:一个consumer对象可以订阅多个topic */ consumer.subscribe("TopicTest2", "*"); consumer.registerMessageListener(new MessageListenerConcurrently() { /** * 默认msgs里只有一条消息,可以通过设置consumeMessageBatchMaxSize参数来批量接收消息 */ @Override public ConsumeConcurrentlyStatus consumeMessage( Listmsgs, ConsumeConcurrentlyContext context) { System.out.println(Thread.currentThread().getName() + " Receive New Messages: " + msgs.size()); MessageExt msg = msgs.get(0); if (msg.getTopic().equals("TopicTest1")) { // 执行TopicTest1的消费逻辑 if (msg.getTags() != null && msg.getTags().equals("TagA")) { // 执行TagA的消费 System.out.println(new String(msg.getBody())); } else if (msg.getTags() != null && msg.getTags().equals("TagC")) { // 执行TagC的消费 } else if (msg.getTags() != null && msg.getTags().equals("TagD")) { // 执行TagD的消费 } } else if (msg.getTopic().equals("TopicTest2")) { System.out.println(new String(msg.getBody())); } return ConsumeConcurrentlyStatus.CONSUME_SUCCESS; } }); /** * Consumer对象在使用之前必须要调用start初始化,初始化一次即可
*/ consumer.start(); System.out.println("Consumer Started."); } }
安装中问题汇总:
> nohup sh bin/mqnamesrv &
先不使用以上命令,如果出错,不会有显示
使用
sh bin/mqnamesrv
出现以下问题
#
# There is insufficient memory for the Java Runtime Environment to continue.
# Native memory allocation (mmap) failed to map 805306368 bytes for committing reserved memory.
# Possible reasons:
# The system is out of physical RAM or swap space
# In 32 bit mode, the process size limit was hit
# Possible solutions:
# Reduce memory load on the system
# Increase physical memory or swap space
# Check if swap backing store is full
# Use 64 bit Java on a 64 bit OS
# Decrease Java heap size (-Xmx/-Xms)
# Decrease number of Java threads
# Decrease Java thread stack sizes (-Xss)
# Set larger code cache with -XX:ReservedCodeCacheSize=
# This output file may be truncated or incomplete.
#
# Out of Memory Error (os_linux.cpp:2627), pid=1864, tid=0x00007f94d8319700
原因:rocketmq默认jvm配置较高,导致内存不足
解决:
runserver.sh
改成
JAVA_OPT="${JAVA_OPT} -server -Xms256m -Xmx256m -Xmn128m -XX:PermSize=128m -XX:MaxPermSize=320m"
同理,运行其他命令也建议先使用sh来运行,解决方法如下
runbroker.sh
JAVA_OPT="${JAVA_OPT} -server -Xms8g -Xmx8g -Xmn4g"
改成:
JAVA_OPT="${JAVA_OPT} -server -Xms256m -Xmx256m -Xmn128m
tools.sh
JAVA_OPT="${JAVA_OPT} -server -Xms1g -Xmx1g -Xmn256m -XX:PermSize=128m -XX:MaxPermSize=128m"
改成
JAVA_OPT="${JAVA_OPT} -server -Xms256m -Xmx256m -Xmn128m -XX:PermSize=128m -XX:MaxPermSize=128m"
调试时问题汇总:
运行java客户端的Producer.java,出现
Caused by: org.apache.rocketmq.remoting.exception.RemotingConnectException: connect to <*****:10911> failed |
经调试,
org.apache.rocketmq.client.impl.producer.DefaultMQProducerImpl
String brokerAddr = this.mQClientFactory.findBrokerAddressInPublish(mq.getBrokerName());
通过broderName获取到的ip不正确
解决:临时解决方案是断点在该代码下方,将brokerAddr设置为正确ip
reference:
https://rocketmq.incubator.apache.org/docs/quick-start/
http://www.tuicool.com/articles/mEBVneB
扩展阅读:
RocketMQ与Kafka对比(18项差异) http://blog.csdn.net/damacheng/article/details/42846549
Rocketmq源码分析(一)整体架构 https://yq.aliyun.com/articles/61141#
RocketMQ 源码分析 http://blog.csdn.net/vonzhoufz/article/details/47191883