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RocketMQ 源码解析 —— 调试环境搭建

日期：2019-01-17点击：472收藏

摘要: 原创出处 http://www.iocoder.cn/RocketMQ/build-debugging-environment/ 「芋道源码」欢迎转载，保留摘要，谢谢！

0. 友情提示

阅读源码之前，建议胖友对 RocketMQ 的文档已经熟读。目前 RocketMQ 4 的中文文档很少，所以英文不太好的胖友，推荐看看如下资料：

《RocketMQ 用户指南》基于 RocketMQ 3 的版本。
《RocketMQ 原理简介》基于 RocketMQ 3 的版本。
《RocketMQ 最佳实践》基于 RocketMQ 3 的版本。
《阿里云 —— 消息队列 MQ》阿里云的消息队列，就是 RocketMQ 的云服务。

1. 依赖工具

JDK ：1.8+
Maven
IntelliJ IDEA

2. 源码拉取

从官方仓库 [https://github.com/apache/rocketmq) Fork 出属于自己的仓库。为什么要 Fork ？既然开始阅读、调试源码，我们可能会写一些注释，有了自己的仓库，可以进行自由的提交。😈

使用 IntelliJ IDEA 从 Fork 出来的仓库拉取代码。拉取完成后，Maven 会下载依赖包，可能会花费一些时间，耐心等待下。

在等待的过程中，我来简单说下，搭建调试环境的过程：

启动 RocketMQ Namesrv
启动 RocketMQ Broker
启动 RocketMQ Producer
启动 RocketMQ Consumer

最小化的 RocketMQ 的环境，暂时不考虑 Namesrv 集群、Broker 集群、Consumer 集群。

😈 另外，本文使用的 RocketMQ 版本是 4.4.0-SNAPSHOT 。

3. 启动 RocketMQ Namesrv

打开 org.apache.rocketmq.namesrv.NameServerInstanceTest 单元测试类，参考 #startup() 方法，我们编写 #main(String[] args) 静态方法，代码如下：

// NameServerInstanceTest.java public static void main(String[] args) throws Exception { // NamesrvConfig 配置 final NamesrvConfig namesrvConfig = new NamesrvConfig(); // NettyServerConfig 配置 final NettyServerConfig nettyServerConfig = new NettyServerConfig(); nettyServerConfig.setListenPort(9876); // 设置端口 // 创建 NamesrvController 对象，并启动 NamesrvController namesrvController = new NamesrvController(namesrvConfig, nettyServerConfig); namesrvController.initialize(); namesrvController.start(); // 睡觉，就不起来 Thread.sleep(DateUtils.MILLIS_PER_DAY); }

然后，右键运行，RocketMQ Namesrv 就启动完成。输出日志如下：

17:54:03.354 [NettyEventExecutor] INFO RocketmqRemoting - NettyEventExecutor service started 17:54:03.355 [FileWatchService] INFO RocketmqCommon - FileWatchService service started

最后，这是一个可选的步骤，命令行中输入 telnet 127.0.0.1 9876 ，看看是否能连接上 RocketMQ Namesrv 。

4. 启动 RocketMQ Broker

打开 org.apache.rocketmq.broker.BrokerControllerTest 单元测试类，参考 #testBrokerRestart() 方法，我们编写 #main(String[] args) 方法，代码如下：

// BrokerControllerTest.java public static void main(String[] args) throws Exception { // 设置版本号 System.setProperty(RemotingCommand.REMOTING_VERSION_KEY, Integer.toString(MQVersion.CURRENT_VERSION)); // NettyServerConfig 配置 final NettyServerConfig nettyServerConfig = new NettyServerConfig(); nettyServerConfig.setListenPort(10911); // BrokerConfig 配置 final BrokerConfig brokerConfig = new BrokerConfig(); brokerConfig.setBrokerName("broker-a"); brokerConfig.setNamesrvAddr("127.0.0.1:9876"); // MessageStoreConfig 配置 final MessageStoreConfig messageStoreConfig = new MessageStoreConfig(); messageStoreConfig.setDeleteWhen("04"); messageStoreConfig.setFileReservedTime(48); messageStoreConfig.setFlushDiskType(FlushDiskType.ASYNC_FLUSH); messageStoreConfig.setDuplicationEnable(false); // BrokerPathConfigHelper.setBrokerConfigPath("/Users/yunai/百度云同步盘/开发/Javascript/Story/incubator-rocketmq/conf/broker.conf"); // 创建 BrokerController 对象，并启动 BrokerController brokerController = new BrokerController(// brokerConfig, // nettyServerConfig, // new NettyClientConfig(), // messageStoreConfig); brokerController.initialize(); brokerController.start(); // 睡觉，就不起来 System.out.println("你猜"); Thread.sleep(DateUtils.MILLIS_PER_DAY); }

然后，右键运行，RocketMQ Broker 就启动完成了。输出日志如下：

你猜

不要懵逼，我们打开下 RocketMQ Namesrv 那，已经输出日志如下：

18:17:30.443 [NettyServerCodecThread_5] INFO RocketmqRemoting - NETTY SERVER PIPELINE: channelRegistered 127.0.0.1:63847 18:17:30.443 [NettyServerCodecThread_5] INFO RocketmqRemoting - NETTY SERVER PIPELINE: channelActive, the channel[127.0.0.1:63847] 18:17:30.457 [RemotingExecutorThread_4] DEBUG RocketmqNamesrv - receive request, 103 127.0.0.1:63847 RemotingCommand [code=103, language=JAVA, version=275, opaque=0, flag(B)=0, remark=null, extFields={brokerId=0, bodyCrc32=1880081823, clusterName=DefaultCluster, brokerAddr=192.168.3.26:10911, haServerAddr=192.168.3.26:10912, compressed=false, brokerName=broker-a}, serializeTypeCurrentRPC=JSON] 18:17:30.458 [RemotingExecutorThread_4] INFO RocketmqNamesrv - new topic registered, BenchmarkTest QueueData [brokerName=broker-a, readQueueNums=1024, writeQueueNums=1024, perm=6, topicSynFlag=0] 18:17:30.458 [RemotingExecutorThread_4] INFO RocketmqNamesrv - new topic registered, OFFSET_MOVED_EVENT QueueData [brokerName=broker-a, readQueueNums=1, writeQueueNums=1, perm=6, topicSynFlag=0] 18:17:30.458 [RemotingExecutorThread_4] INFO RocketmqNamesrv - new topic registered, broker-a QueueData [brokerName=broker-a, readQueueNums=1, writeQueueNums=1, perm=7, topicSynFlag=0] 18:17:30.458 [RemotingExecutorThread_4] INFO RocketmqNamesrv - new topic registered, TBW102 QueueData [brokerName=broker-a, readQueueNums=8, writeQueueNums=8, perm=7, topicSynFlag=0] 18:17:30.458 [RemotingExecutorThread_4] INFO RocketmqNamesrv - new topic registered, SELF_TEST_TOPIC QueueData [brokerName=broker-a, readQueueNums=1, writeQueueNums=1, perm=6, topicSynFlag=0] 18:17:30.458 [RemotingExecutorThread_4] INFO RocketmqNamesrv - new topic registered, DefaultCluster QueueData [brokerName=broker-a, readQueueNums=16, writeQueueNums=16, perm=7, topicSynFlag=0] 18:17:30.458 [RemotingExecutorThread_4] INFO RocketmqNamesrv - new broker registered, 192.168.3.26:10911 HAServer: 192.168.3.26:10912

妥妥的，原来 RocketMQ Broker 已经启动完成，并且注册到 RocketMQ Namesrv 上。

最后，这是一个可选的步骤，命令行中输入 telnet 127.0.0.1 10911 ，看看是否能连接上 RocketMQ Broker 。

5. 启动 RocketMQ Producer

打开 org.apache.rocketmq.example.quickstart.Producer 示例类，代码如下：

// Producer.java /** * This class demonstrates how to send messages to brokers using provided {@link DefaultMQProducer}. */ public class Producer { public static void main(String[] args) throws MQClientException, InterruptedException { /* * Instantiate with a producer group name. */ DefaultMQProducer producer = new DefaultMQProducer("please_rename_unique_group_name"); /* * Specify name server addresses. * <p/> * * Alternatively, you may specify name server addresses via exporting environmental variable: NAMESRV_ADDR * <pre> * {@code * producer.setNamesrvAddr("name-server1-ip:9876;name-server2-ip:9876"); * } * </pre> */ /* * Launch the instance. */ producer.setNamesrvAddr("127.0.0.1:9876"); // <x> 哈哈哈哈 producer.start(); for (int i = 0; i < 1000; i++) { try { /* * Create a message instance, specifying topic, tag and message body. */ Message msg = new Message("TopicTest" /* Topic */, "TagA" /* Tag */, ("Hello RocketMQ " + i).getBytes(RemotingHelper.DEFAULT_CHARSET) /* Message body */ ); /* * Call send message to deliver message to one of brokers. */ SendResult sendResult = producer.send(msg); System.out.printf("%s%n", sendResult); } catch (Exception e) { e.printStackTrace(); Thread.sleep(1000); } } /* * Shut down once the producer instance is not longer in use. */ producer.shutdown(); } }

注意，在 <x> 哈哈哈哈处，我们增加了 producer.setNamesrvAddr("127.0.0.1:9876") 代码块，指明 Producer 使用的 RocketMQ Namesrv 。
😈 可能会有胖友会问，为什么指定的不是 RocketMQ Broker 呢？请退回到「0. 友情提示」。

然后，右键运行，RocketMQ Producer 就启动完成。输出日志如下：

18:22:13.507 [main] DEBUG i.n.u.i.l.InternalLoggerFactory - Using SLF4J as the default logging framework SendResult [sendStatus=SEND_OK, msgId=C0A8031AE91718B4AAC27A6364050000, offsetMsgId=C0A8031A00002A9F0000000000000000, messageQueue=MessageQueue [topic=TopicTest, brokerName=broker-a, queueId=1], queueOffset=0] // ... 中间省略 N 条 ... SendResult [sendStatus=SEND_OK, msgId=C0A8031AE91718B4AAC27A6369F603E6, offsetMsgId=C0A8031A00002A9F000000000002BD4A, messageQueue=MessageQueue [topic=TopicTest, brokerName=broker-a, queueId=3], queueOffset=249] SendResult [sendStatus=SEND_OK, msgId=C0A8031AE91718B4AAC27A6369F703E7, offsetMsgId=C0A8031A00002A9F000000000002BDFE, messageQueue=MessageQueue [topic=TopicTest, brokerName=broker-a, queueId=0], queueOffset=249] 18:22:15.558 [NettyClientSelector_1] INFO RocketmqRemoting - closeChannel: close the connection to remote address[192.168.3.26:10911] result: true 18:22:15.559 [NettyClientSelector_1] INFO RocketmqRemoting - closeChannel: close the connection to remote address[127.0.0.1:9876] result: true 18:22:15.560 [NettyClientSelector_1] INFO RocketmqRemoting - closeChannel: close the connection to remote address[192.168.3.26:10909] result: true

没有最后。

6. 启动 RocketMQ Consumer

打开 org.apache.rocketmq.example.quickstart.Consumer 示例类，代码如下：

// Consumer.java public class Consumer { public static void main(String[] args) throws InterruptedException, MQClientException { /* * Instantiate with specified consumer group name. */ DefaultMQPushConsumer consumer = new DefaultMQPushConsumer("please_rename_unique_group_name_4"); /* * Specify name server addresses. * <p/> * * Alternatively, you may specify name server addresses via exporting environmental variable: NAMESRV_ADDR * <pre> * {@code * consumer.setNamesrvAddr("name-server1-ip:9876;name-server2-ip:9876"); * } * </pre> */ /* * Specify where to start in case the specified consumer group is a brand new one. */ consumer.setNamesrvAddr("127.0.0.1:9876"); // <x> 哈哈哈哈 consumer.setConsumeFromWhere(ConsumeFromWhere.CONSUME_FROM_FIRST_OFFSET); /* * Subscribe one more more topics to consume. */ consumer.subscribe("TopicTest", "*"); /* * Register callback to execute on arrival of messages fetched from brokers. */ consumer.registerMessageListener(new MessageListenerConcurrently() { @Override public ConsumeConcurrentlyStatus consumeMessage(List<MessageExt> msgs, ConsumeConcurrentlyContext context) { System.out.printf("%s Receive New Messages: %s %n", Thread.currentThread().getName(), msgs); return ConsumeConcurrentlyStatus.CONSUME_SUCCESS; } }); /* * Launch the consumer instance. */ consumer.start(); System.out.printf("Consumer Started.%n"); } }

注意，在 <x> 哈哈哈哈处，我们还增加了 consumer.setNamesrvAddr("127.0.0.1:9876") 代码块，指明 Consumer 使用的 RocketMQ Namesrv 。
😈 再来一道送命题，为什么指定的不是 RocketMQ Broker 呢？

然后，右键运行，RocketMQ Consumer 就启动完成。输入日志如下：

18:37:12.196 [main] DEBUG i.n.u.i.l.InternalLoggerFactory - Using SLF4J as the default logging framework Consumer Started. ConsumeMessageThread_2 Receive New Messages: [MessageExt [queueId=3, storeSize=178, queueOffset=0, sysFlag=0, bornTimestamp=1543054934061, bornHost=/192.168.3.26:64103, storeTimestamp=1543054934065, storeHost=/192.168.3.26:10911, msgId=C0A8031A00002A9F0000000000000164, commitLogOffset=356, bodyCRC=1250039395, reconsumeTimes=0, preparedTransactionOffset=0, toString()=Message{topic='TopicTest', flag=0, properties={MIN_OFFSET=0, MAX_OFFSET=250, CONSUME_START_TIME=1543055832771, UNIQ_KEY=C0A8031AE91718B4AAC27A63642D0002, WAIT=true, TAGS=TagA}, body=[72, 101, 108, 108, 111, 32, 82, 111, 99, 107, 101, 116, 77, 81, 32, 50], transactionId='null'}]] ConsumeMessageThread_16 Receive New Messages: [MessageExt [queueId=2, storeSize=179, queueOffset=4, sysFlag=0, bornTimestamp=1543054934102, bornHost=/192.168.3.26:64103, storeTimestamp=1543054934103, storeHost=/192.168.3.26:10911, msgId=C0A8031A00002A9F0000000000000BD9, commitLogOffset=3033, bodyCRC=367242165, reconsumeTimes=0, preparedTransactionOffset=0, toString()=Message{topic='TopicTest', flag=0, properties={MIN_OFFSET=0, MAX_OFFSET=250, CONSUME_START_TIME=1543055832779, UNIQ_KEY=C0A8031AE91718B4AAC27A6364560011, WAIT=true, TAGS=TagA}, body=[72, 101, 108, 108, 111, 32, 82, 111, 99, 107, 101, 116, 77, 81, 32, 49, 55], transactionId='null'}]] // ... 中间省略 N 条 ... CONSUME_START_TIME=1543055832779, UNIQ_KEY=C0A8031AE91718B4AAC27A636450000F, WAIT=true, TAGS=TagA}, body=[72, 101, 108, 108, 111, 32, 82, 111, 99, 107, 101, 116, 77, 81, 32, 49, 53], transactionId='null'}]]

没有最后。