Viewing Subscription Relationships of a Topic

Last updated:2026-01-23 17:34:03

Viewing Subscription Relationships of a Topic

Last updated: 2026-01-23 17:34:03

You can view groups subscribed to a topic to understand the subscription status of all groups subscribed to the topic, including the group list, online status, and message backlog. Through the information, you can confirm whether messages are consumed normally, promptly detect topics without group subscriptions, and assess the impact scope of business changes.
Viewing Subscription Groups
1. Log in to the TDMQ for RocketMQ console.
2. In the left sidebar, choose Resource > Cluster, select a region, and click the ID of the target cluster to go to the cluster basic information page.
3. On the cluster basic information page, select the Topic tab, click the target topic name, and select the Subscription Group tab to display the information about groups subscribed to this topic.
Parameter Name
Description
Group Name
Unique identifier of a consumer group. All consumers within the group jointly consume messages from the same topic, achieving load balancing.
Status
Status of a consumer group, typically Online or Offline. The offline status indicates that there are no running consumer instances within this group.
Consumption Mode
The options include clustering consumption and broadcasting consumption.
Clustering consumption: Each message is consumed by only one consumer within the group.
Broadcasting consumption: Each message is consumed once by every consumer within the group.
Protocol Type
Communication protocols used by consumers, such as Transmission Control Protocol (TCP) and Hypertext Transfer Protocol (HTTP), determine the interaction method between the client and the broker.
Filter Type
Method for filtering messages. The options include TAG and SQL92.
TAG: Simple matching is performed based on the message tag.
SQL92: Complex filtering is performed on message properties through custom structured query language (SQL) expressions.
Filter Rule
Specific filter condition applied. For example, it may be TagA in TAG mode and a > 5 in SQL92 mode.
Heaped Messages
Total number of unconsumed messages in a consumer group, which is a critical metric for measuring consumption health. Persistent backlog increase indicates that the consumption speed is lagging behind the production speed.
Consumption Progress Update Time
Time when the consumption progress (offset) of this consumer group was last committed to the broker, reflecting the activity level of the consumer. If the consumption progress is not updated for a long time, the consumer may have entered a zombie status or stopped consumption.
Operation
If certain groups under the topic are offline (that is, no online clients), you can click Unsubscribe in the operation column to clear historical subscription data, preventing businesses from being affected by historical dirty data.

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Parameter Name	Description
Group Name	Unique identifier of a consumer group. All consumers within the group jointly consume messages from the same topic, achieving load balancing.
Status	Status of a consumer group, typically Online or Offline. The offline status indicates that there are no running consumer instances within this group.
Consumption Mode	The options include clustering consumption and broadcasting consumption. Clustering consumption: Each message is consumed by only one consumer within the group. Broadcasting consumption: Each message is consumed once by every consumer within the group.
Protocol Type	Communication protocols used by consumers, such as Transmission Control Protocol (TCP) and Hypertext Transfer Protocol (HTTP), determine the interaction method between the client and the broker.
Filter Type	Method for filtering messages. The options include TAG and SQL92. TAG: Simple matching is performed based on the message tag. SQL92: Complex filtering is performed on message properties through custom structured query language (SQL) expressions.
Filter Rule	Specific filter condition applied. For example, it may be `TagA` in TAG mode and `a > 5` in SQL92 mode.
Heaped Messages	Total number of unconsumed messages in a consumer group, which is a critical metric for measuring consumption health. Persistent backlog increase indicates that the consumption speed is lagging behind the production speed.
Consumption Progress Update Time	Time when the consumption progress (offset) of this consumer group was last committed to the broker, reflecting the activity level of the consumer. If the consumption progress is not updated for a long time, the consumer may have entered a zombie status or stopped consumption.
Operation	If certain groups under the topic are offline (that is, no online clients), you can click Unsubscribe in the operation column to clear historical subscription data, preventing businesses from being affected by historical dirty data.

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Viewing Subscription Groups