When debugging message delivery or verifying consumer configurations, you need to confirm which groups subscribe to a topic and which topics a group consumes. The ApsaraMQ for RocketMQ console provides real-time subscription lookups in both directions.
Prerequisites
Before you begin, make sure that:
The target group is in the Online state
How subscriptions work
A consumer group contains multiple consumer instances that jointly process messages. For most distributed applications, multiple consumer instances are attached to a group. Each subscription is a topic-tag pair -- the topic that the group subscribes to and a filtering tag that controls which messages are delivered from that topic.
All consumer instances in the same group must use identical subscriptions. Mismatched subscriptions cause unpredictable consumption behavior and can lead to message loss. For details, see Subscription consistency.
Find groups that subscribe to a topic
Use this procedure to identify all online consumer groups that consume messages from a specific topic.
Log on to the ApsaraMQ for RocketMQ console. In the left-side navigation pane, click Instances.
In the top navigation bar, select a region, such as China (Hangzhou). On the Instances page, click the name of the instance that you want to manage.
In the left-side navigation pane, click Topics. Click the target topic name.
On the Basic Information tab, find the Details of Online Groups section. This section lists each online group that subscribes to the topic.
(Optional) Click a group ID to open the group details page for further inspection.
Find topics that a group subscribes to
Use this procedure to list all topics that a specific consumer group subscribes to, along with the filtering tags applied to each subscription.
Log on to the ApsaraMQ for RocketMQ console. In the left-side navigation pane, click Instances.
In the top navigation bar, select a region, such as China (Hangzhou). On the Instances page, click the name of the instance that you want to manage.
In the left-side navigation pane, click Groups. Click the target group name.
On the Basic Information tab, find the Subscriptions section. This section lists each topic the group subscribes to and the corresponding filtering tags.
(Optional) Click a topic name to open the topic details page for further inspection.