如何删除卡夫卡“幽灵”消费者？

Question

When I use Kafka Tool: https://www.kafkatool.com/ I see additional consumer groups that I do not see with kafka-consumer-groups.sh

I'm assuming that the additional consumer groups are coming from Zookeeper while kafka-consumer-groups.sh only shows what it sees on the brokers.

Is there a way to delete these "ghost" groups? They are not used? Can I manually browse zookeeper and go delete those nodes?

Answer 1

IIRC, KafkaTool uses Zookeeper, not --bootstrap-server AdminClient protocol to list groups that kafka-consumer-groups does...

Also, kafka-console-consumer creates random groups that get hidden in the kafka-consumer-groups output.

While you could remove them from Zookeeper, all inactive consumer groups will automatically go away, as per the offsets retention policies over time, and having them there doesn't cause any performance penalties.