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https://issues.apache.org/jira/browse/KAFKA-6421?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jason Gustafson resolved KAFKA-6421.
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Resolution: Fixed
> consumer group can't show when use kafka-consumer-groups tool if the leader
> of __consumer_offsets partition for this group changed
> -----------------------------------------------------------------------------------------------------------------------------------
>
> Key: KAFKA-6421
> URL: https://issues.apache.org/jira/browse/KAFKA-6421
> Project: Kafka
> Issue Type: Bug
> Components: offset manager, tools
> Affects Versions: 0.10.2.0, 0.11.0.1, 1.0.0
> Reporter: yuemeng
> Assignee: Vahid Hashemian
> Priority: Critical
>
> follow steps will reproduce this problem:
> 1)there is a 3 brokers kafka cluster,use kafka-console-consumer.sh to
> consumer one topic and suppose group named "test-consumer-group",after a
> while, we stop consumer this topic.
> 2)suppose test-consumer-group will be write offset meta to partition 3 of
> __consumer_offsets,and the leader of partition 3 is broker 1.
> 3) and we scale the cluster to 5 nodes ,and reassign partititons,and leader
> of partition 3 is change to 0
> 4)then we use kafka-consumer-groups.sh --list can't show
> test-consumer-group,but the offset meta still in topic __consumer_offsets
> and i found that:
> protocolType will be change to empty for test-consumer-group after leader
> changed.
> at last.
> {code}
> listAllGroupsFlattened.filter(_.protocolType ==
> ConsumerProtocol.PROTOCOL_TYPE)
> {code}
> filter this test-consumer-group,so we can't use kafka-consumer-groups.sh to
> list it
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