tencent cloud

TDMQ for Pulsar records the complete flow in which a message is sent from the producer to the TDMQ for Pulsar server and then consumed by the consumer, and then displays the flow as a message trace in the console.
A message trace records the entire process in which the message is sent from the producer to the TDMQ for Pulsar server and eventually to the consumer, including the duration of each stage (accurate down to the microsecond), execution result, producer IP, and consumer IP.

Overview

You can use the message query feature in the TDMQ for Pulsar console to view the content, parameters, and trace of a specific message by time or by the message ID displayed in the log. This enables you to:

• View the specific content and parameters of the message.
• View from which producer IP a message was sent, whether it was sent successfully, and the specific time when it arrived at the server.
• View whether the message was persistently stored.
• View which consumers consumed the message, whether it was consumed successfully, and the specific time when its consumption was acknowledged.
• View the MQ's message processing latency to analyze the performance of the distributed system.

Query Limits

• You can query messages in the last 3 days.
• You can query up to 65,536 messages at a time.

Prerequisites

You have deployed the producer and consumer services as instructed in the SDK documentation, and they produced and consumed messages in the last 7 days.

Directions

1. Log in to the TDMQ for Pulsar console and click Message Query on the left sidebar.
2. On the Message Query page, select the region and environment first and then the time range for query. If you know the message ID, you can also enter it for exact match query.
3. Click Query, and the list below will display paginated results.
   
4. Click View Details in the Operation column of the target message to view its basic information, content (message body), and parameters.
   
5. Click View Message Trace in the Operation column or select the Message Trace tab on the details page to view the trace of the message. For more information, see Message Trace Query Result Description.
   

Message Trace Query Result Description

A message trace query result consists of three parts: message production, message storage, and message consumption.

Message production

Message storage

Message consumption

Message consumption is displayed in the form of a list. TDMQ for Pulsar supports multi-subscription mode, where a message may be consumed by multiple consumers in multiple subscriptions.

The information displayed in the list is as described below: