Why Is the Number of Stacked Messages Monitored as 0 when Messages Are Stacked?
Symptom
On the Consumer Offset tab page of the consumer group details page, there are stacked messages in a topic (total stack ≠ 0), whereas the Consumer Available Messages on the consumer group monitoring page is 0.
Conclusion
The total stack on the Consumer Offset tab page and the Consumer Available Messages are not synchronously updated.
The total stack is sampled immediately. The Consumer Available Messages is sampled every minute. You see the stack number at your time. When a consumer consumes all the stacked messages within 1 minute, Consumer Available Messages displays 0.
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