问题描述

在使用RocketMQ的可视化工具dashboard-1.0.0时，首先生产了10条数据，但是查询时却查出来了14条，有四条数据重复，重复数据MessageID和key相同，但是通过key单独查询却只能查出一条

测试代码

package com.fdw.rocketmq.producer;

import org.apache.rocketmq.client.exception.MQClientException;
import org.apache.rocketmq.client.producer.DefaultMQProducer;
import org.apache.rocketmq.common.message.Message;
import org.apache.rocketmq.remoting.exception.RemotingException;

public class OneWayProducer {

    public static void main(String[] args) throws MQClientException, RemotingException, InterruptedException {

        int messageCount = 10;
        DefaultMQProducer producer = new DefaultMQProducer("pg");
        producer.setNamesrvAddr("127.0.0.1:9876");
        // 设置发送超时时限为5s，默认3s
        producer.setSendMsgTimeout(5000);
        producer.start();
        for (int i = 0; i < messageCount; i++) {
            byte[] body = ("Hi," + i).getBytes();
            Message msg = new Message("OneWayTopic", "oneWay", body);
            msg.setKeys(i+"");
            // 单向发送
            producer.sendOneway(msg);
            System.out.println("消息发送完毕"+i);
        }
        System.out.println("消息发送完毕");
        producer.shutdown();
        System.out.println("producer shutdown");
    }
}

解决办法

修改dashboard的源码,org.apache.rocketmq.dashboard.service.impl.MessageServiceImpl的271行，修改成

Long maxOffset = consumer.searchOffset(messageQueue, query.getEnd());

重新编译jar包

重新启动dashboard，查询


修改后查询恢复正常！！！

官方回答：https://developer.aliyun.com/ask/543579