RocketMQ5-03RocketMQ-Dashboard和Java客户端访问示例-编程知识

接上篇02快速部署RocketMQ5.x(手动和容器部署)
已经完成 RocketMQ5.0 环境的部署，就需要对这个环境进行测试，查看集群、写入消息、读取消息等

本篇教你如何使用和查看部署的服务：

Docker部署 Dashboard
- 获取镜像并下载
- 部署服务
客户端连接
- pom文件
- 生产者代码
- 消费者代码
- 接口测试
- 问题: broker资源不足无法提供服务

Docker部署 Dashboard

以上通过可执行文件部署或者容器部署的形式，都需要有一个可以查看的集群的地方，对于官方自己配备的有 rocketmq-dashboard, 可以使用docker快速部署，便于测试

获取镜像并下载

docker search rocketmq-dashboard & docker pull apacherocketmq/rocketmq-dashboard

部署服务

docker run -d --name rmqdashboard -e "JAVA_OPTS=-Xmx256M -Xms256M -Xmn128M -Drocketmq.namesrv.addr=192.168.2.92:9876 -Dcom.rocketmq.sendMessageWithVIPChannel=false" -p 8088:8080 apacherocketmq/rocketmq-dashboard

这边将端口映射到了8088，所以访问 localhost:8088，就可以查看到集群，如果有数据正在写入与读取，就能够大概看到数据量
在这里插入图片描述

客户端连接

手动创建 topic: sh bin/mqadmin updatetopic -n 192.168.2.92:9876 -t dataTopic2 -c DefaultCluster

pom文件

 <properties><java.version>17</java.version><project.build.sourceEncoding>UTF-8</project.build.sourceEncoding><project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding><spring-boot.version>3.0.2</spring-boot.version></properties><dependencies><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-web</artifactId></dependency><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-test</artifactId><scope>test</scope></dependency><dependency><groupId>org.apache.rocketmq</groupId><artifactId>rocketmq-client-java</artifactId><version>5.0.5</version></dependency><dependency><groupId>org.projectlombok</groupId><artifactId>lombok</artifactId></dependency></dependencies><dependencyManagement><dependencies><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-dependencies</artifactId><version>${spring-boot.version}</version><type>pom</type><scope>import</scope></dependency></dependencies></dependencyManagement><build><plugins><plugin><groupId>org.apache.maven.plugins</groupId><artifactId>maven-compiler-plugin</artifactId><version>3.8.1</version><configuration><source>17</source><target>17</target><encoding>UTF-8</encoding></configuration></plugin><plugin><groupId>org.springframework.boot</groupId><artifactId>spring-boot-maven-plugin</artifactId><version>${spring-boot.version}</version><configuration><mainClass>com.learning.springbootrmq5.SpringbootRmq5Application</mainClass><skip>true</skip></configuration><executions><execution><id>repackage</id><goals><goal>repackage</goal></goals></execution></executions></plugin></plugins></build>

生产者代码

 @GetMapping("/sendSync")public String sendSync() throws ClientException, IOException {String endpoint = "192.168.2.92:8081";String topic = "dataTopic2";ClientServiceProvider provider = ClientServiceProvider.loadService();ClientConfigurationBuilder builder = ClientConfiguration.newBuilder().setEndpoints(endpoint);ClientConfiguration configuration = builder.enableSsl(true).build();Producer producer = provider.newProducerBuilder().setTopics(topic).setClientConfiguration(configuration).build();Message message = provider.newMessageBuilder().setTopic(topic).setKeys("messageKey").setTag("messageTag").setBody("messageBodySync".getBytes()).build();try {SendReceipt sendReceipt = producer.send(message);log.info("Send sync message successfully, messageId={}", sendReceipt.getMessageId());} catch (ClientException e) {log.error("Failed to send message", e);}producer.close();return "success";}@GetMapping("/sendAsync")public String sendAsync() throws ClientException, InterruptedException, IOException {String endpoint = "192.168.2.92:8081";String topic = "dataTopic2";ClientServiceProvider provider = ClientServiceProvider.loadService();ClientConfigurationBuilder builder = ClientConfiguration.newBuilder().enableSsl(true).setEndpoints(endpoint);ClientConfiguration configuration = builder.build();Producer producer = provider.newProducerBuilder().setTopics(topic).setClientConfiguration(configuration).build();Message message = provider.newMessageBuilder().setTopic(topic).setKeys("messageKey").setTag("messageTag").setBody("messageBodyASync".getBytes()).build();producer.sendAsync(message);log.info("Send async message successfully, messageId");return "success";}

消费者代码

@Slf4j
@Component
public class MessageConsumerRunner implements CommandLineRunner {@Overridepublic void run(final String... args) throws Exception {final ClientServiceProvider provider = ClientServiceProvider.loadService();String endpoints = "192.168.2.92:8081";ClientConfiguration clientConfiguration = ClientConfiguration.newBuilder().setEndpoints(endpoints).build();String tag = "*";FilterExpression filterExpression = new FilterExpression(tag, FilterExpressionType.TAG);String consumerGroup = "YourConsumerGroup";String topic = "dataTopic2";PushConsumer pushConsumer = provider.newPushConsumerBuilder().setClientConfiguration(clientConfiguration).setConsumerGroup(consumerGroup).setSubscriptionExpressions(Collections.singletonMap(topic, filterExpression)).setMessageListener(messageView -> {log.info("Consume message successfully, messageId={}", messageView.getMessageId());return ConsumeResult.SUCCESS;}).build();Thread.sleep(Long.MAX_VALUE);}
}

接口测试

请求接口 /msg/sendAsync
在这里插入图片描述

能够正常收发

问题: broker资源不足无法提供服务

可能出现的客户端报错为：

org.apache.rocketmq.client.java.exception.InternalErrorException: [request-id=e3f9dxxxx1aa872, response-code=50001] org.apache.rocketmq.proxy.common.ProxyException: service not available now. It may be caused by one of the following reasons: the broker's disk is full [CL:  0.96 CQ:  0.96 INDEX: -1.00], messages are put to the slave, message store has been shut down, etc.java.util.concurrent.RejectedExecutionException: Task org.apache.rocketmq.shaded.io.grpc.internal.DelayedStream$4@72ba34c2 rejected from java.util.concurrent.ThreadPoolExecutor@7deb0119[Terminated, pool size = 0, active threads = 0, queued tasks = 0, completed tasks = 13]at java.base/java.util.concurrent.ThreadPoolExecutor$AbortPolicy.rejectedExecution(ThreadPoolExecutor.java:2065) ~[na:na]at java.base/java.util.concurrent.ThreadPoolExecutor.reject(ThreadPoolExecutor.java:833) ~[na:na]at java.base/java.util.concurrent.ThreadPoolExecutor.execute(ThreadPoolExecutor.java:1365) ~[na:na]

以上大体就是描述资源不足无法进行接入、服务不可达等，通常就是因为环境的资源不足，可能是内存、可能是硬盘

从 .../broker/logs/rocketmqlogs/store.log 中可以看出端倪，是磁盘存储不够了

2024-01-08 13:34:24 ERROR StoreScheduledThread1 - physic disk maybe full soon 0.95, so mark disk full, storePathPhysic=/home/rocketmq/store/commitlog

可以通过清除以下数据暂时缓解 .../broker/store/commitlog，可以发现没怎么用也有好多G。不过确实需要使用的话尽早考虑扩容啊

扩大存储增加可用磁盘空间，就能够正常使用连接了

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