问题描述
报错如下：
.... .... Caused by: org.apache.kafka.common.errors.TimeoutException: Expiring 1 record(s) for art-0:120001 ms has passed since batch creation
原因分析
这种情况，肯定要先看网络问题嘛
- 首先查看本机防火墙的配置
结果都是关闭的 （建议开放特定端口）
[root@localhost bin]# systemctl status firewalld.service ● firewalld.service - firewalld - dynamic firewall daemon Loaded: loaded (/usr/lib/systemd/system/firewalld.service; disabled; vendor preset: enabled) Active: inactive (dead) Docs: man:firewalld(1) [root@localhost bin]#
不关闭防火墙，但是建议本机防火墙开放特定端口，可以使用如下命令 （使用root账户）
firewall-cmd --zone=public --add-port=2181/tcp --permanent firewall-cmd --zone=public --add-port=9092/tcp --permanent firewall-cmd --reload firewall-cmd --list-ports
比如
[root@localhost bin]# systemctl status firewalld ● firewalld.service - firewalld - dynamic firewall daemon Loaded: loaded (/usr/lib/systemd/system/firewalld.service; disabled; vendor preset: enabled) Active: active (running) since Thu 2023-10-26 10:13:10 CST; 2min 36s ago Docs: man:firewalld(1) Main PID: 40311 (firewalld) Tasks: 2 Memory: 28.1M CGroup: /system.slice/firewalld.service └─40311 /usr/bin/python2 -Es /usr/sbin/firewalld --nofork --nopid Oct 26 10:13:10 localhost.localdomain systemd[1]: Starting firewalld - dynamic firewall daemon... Oct 26 10:13:10 localhost.localdomain systemd[1]: Started firewalld - dynamic firewall daemon. Oct 26 10:13:10 localhost.localdomain firewalld[40311]: WARNING: AllowZoneDrifting is enabled. This is considered an insecure configurati...it now. Hint: Some lines were ellipsized, use -l to show in full. [root@localhost bin]# [root@localhost bin]# [root@localhost bin]# firewall-cmd --zone=public --add-port=2181/tcp --permanent success [root@localhost bin]# firewall-cmd --zone=public --add-port=9092/tcp --permanent success [root@localhost bin]# [root@localhost bin]# firewall-cmd --list-ports [root@localhost bin]# [root@localhost bin]# firewall-cmd --reload success [root@localhost bin]# firewall-cmd --list-ports 2181/tcp 9092/tcp [root@localhost bin]#
- 接着看看kafka中间件的配置， 问题就在这里
我并没有大改配置，具体的配置可参考 Kafak - 单机/集群快速安装指北(3.x版本)
如下的配置并没有修改
要解决这个问题，修改如上配置即可
Code
package com.artisan.pc; import org.apache.kafka.clients.producer.KafkaProducer; import org.apache.kafka.clients.producer.ProducerConfig; import org.apache.kafka.clients.producer.ProducerRecord; import org.apache.kafka.clients.producer.RecordMetadata; import org.apache.kafka.common.serialization.StringSerializer; import java.util.Properties; import java.util.concurrent.ExecutionException; /** * @author 小工匠 * @version 1.0 * @mark: show me the code , change the world */ public class CustomProducer { public static void main(String[] args) throws ExecutionException, InterruptedException { // 1. 创建kafka生产者的配置对象 Properties properties = new Properties(); // 2. 给kafka配置对象添加配置信息 properties.put(ProducerConfig.BOOTSTRAP_SERVERS_CONFIG, "192.168.126.170:9092"); // key,value序列化 properties.put(ProducerConfig.KEY_SERIALIZER_CLASS_CONFIG, StringSerializer.class.getName()); properties.put(ProducerConfig.VALUE_SERIALIZER_CLASS_CONFIG, StringSerializer.class.getName()); // 3. 创建kafka生产者对象 KafkaProducer<String, String> kafkaProducer = new KafkaProducer<String, String>(properties); // 4. 调用send方法,发送消息 for (int i = 0; i < 10; i++) { // 同步阻塞 RecordMetadata art = kafkaProducer.send(new ProducerRecord<>("art", "kafka-msg-" + i)).get(); System.out.println(art.topic()); System.out.println("over - " +i); } // 5. 关闭资源 kafkaProducer.close(); } }
可以看消费者的控制台程序，输出正常
