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    ApsaraMQ for Kafka:Why does the Client column show "n/a"?

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    ApsaraMQ for Kafka:Why does the Client column show "n/a"?

    Last Updated:Jun 20, 2026

    Symptom

    In the ApsaraMQ for Kafka console, on the Subscriptions tab of the Topic Details page or on the Consumer Status tab of the Group Details page, the Client column in the Consumer Details panel displays n/a.

    Possible causes

    • The consumer thread that subscribes to the topic partition is offline.

    • A rebalance is triggered for the group. During a rebalance, all consumer threads in the group stop consuming messages.

    • You use the assign method to manually assign a consumer to specific topic partitions. Because this assignment is explicit, Apache Kafka does not track the associated client information.

      The console displays client details only when you use the subscribe method, which enables automatic partition assignment.

      In the Consumer Details panel, the Client column displays the client ID for the consumer assigned to each partition (for example, consumer-xxx). You can also view the earliest offset, latest offset, consumer offset, and lag for each partition.