# Message Tracing

Business operations using message tracing require enabling message tracing on both the production side and the consumption side.

## Enable on Production Side

```
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 org.apache.rocketmq.remoting.common.RemotingHelper;
import org.apache.rocketmq.acl.common.AclClientRPCHook;
import org.apache.rocketmq.acl.common.SessionCredentials;
import org.apache.rocketmq.remoting.RPCHook;

public class Producer {
    // Instance access uses public and private keys, which can be obtained from the instance token management page
    private static final String ACCESS_KEY = "xxx";
    private static final String SECRET_KEY = "xxx";

    static RPCHook getAclRPCHook() {
        return new AclClientRPCHook(new SessionCredentials(ACCESS_KEY, SECRET_KEY));
    }
    public static void main(String[] args) throws MQClientException, InterruptedException {

        // "ProducerGroupName" is the producer group, users can use the producer group created in the console or customize it, the final argument is set to ""
        DefaultMQProducer producer = new DefaultMQProducer("ProducerGroupName", getAclRPCHook(), true, "");
        // Instance access address, can obtain from instance list page
        producer.setNamesrvAddr("1.1.1.1:9876");
        producer.start();

        for(int i = 0; i < 128; i++)
            try {
                {
                    Message msg = new Message("Topic_Name",
                        "Message_Tag",
                        "Message_Key",
                        "Message Content Hello World".getBytes(RemotingHelper.DEFAULT_CHARSET));
                    SendResult sendResult = producer.send(msg);
                    System.out.printf("%s%n", sendResult);
                }

            } catch (Exception e) {
                e.printStackTrace();
            }

        producer.shutdown();
    }
}
```

## Enable on Consumption Side

```
import java.util.List;
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.consumer.rebalance.AllocateMessageQueueAveragely;
import org.apache.rocketmq.client.exception.MQClientException;
import org.apache.rocketmq.common.message.MessageExt;
import org.apache.rocketmq.acl.common.AclClientRPCHook;
import org.apache.rocketmq.acl.common.SessionCredentials;
import org.apache.rocketmq.remoting.RPCHook;

public class PushConsumer {
    // Instance access uses public and private keys, which can be obtained from the instance token management page
    private static final String ACCESS_KEY = "xxx";
    private static final String SECRET_KEY = "xxx";

    static RPCHook getAclRPCHook() {
        return new AclClientRPCHook(new SessionCredentials(ACCESS_KEY, SECRET_KEY));
    }

    public static void main(String[] args) throws InterruptedException, MQClientException {
        // "GROUP_NAME" is the consumer group, you can get it on the instance group management page, the last argument is set to ""
        DefaultMQPushConsumer consumer = new DefaultMQPushConsumer("GROUP_NAME", getAclRPCHook(),
            new AllocateMessageQueueAveragely(), true, "");
        // Instance access address, can get from the instance list page
        consumer.setNamesrvAddr("1.1.1.1:8100");
        consumer.subscribe("Topic_Name", "*");
        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;
            }
        });
        consumer.start();
        System.out.printf("Consumer Started.%n");
    }
}
```