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https://issues.apache.org/jira/browse/KAFKA-14849?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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zou shengfu updated KAFKA-14849:
--------------------------------
    Description: 
# At first, we modify the group.instance.id for consumers wrongly, so different 
consumers have the same group.instance.id for a while.
2. After we rollbak the configuration about group.instance.id, consumers 
receive INCONSISTENT_GROUP_PROTOCOL error even the configuration of all 
consumers is same
3. Coordinator of this group accepts ten thousands of join group request from 
consumers
!screenshot-1.png! 
4. Consumers can get message normally after restarting the coordinator of this 
group. I have upload the log about kafka broker and the group name is 
mario_ad_stats_alo_va

I want to know why consumer receive INCONSISTENT_GROUP_PROTOCOL error even 
configuration of all consumers are same after rollbacking the modification 
about group.instance.id, and I use the static membership and cooperative 
rebalance at the same time

  was:
# At first, we modify the group.instance.id for consumers wrongly, so different 
consumers have the same group.instance.id for a while.
2. After we rollbak the configuration about group.instance.id, consumers 
receive INCONSISTENT_GROUP_PROTOCOL error even the configuration of all 
consumers is same
3. Coordinator of this group accepts ten thousands of join group request from 
consumers
!screenshot-1.png! 
4. Consumers can get message normally after restarting the coordinator of this 
group. I have upload the log about kafka broker and the group name is 
mario_ad_stats_alo_va

I want to know why consumer receive INCONSISTENT_GROUP_PROTOCOL error even 
configuration of all consumers are same after rollbacking the modification 
about group.instance.id.


> Kafka consumers receive INCONSISTENT_GROUP_PROTOCOL error even the 
> configuration of all consumers is same
> ---------------------------------------------------------------------------------------------------------
>
>                 Key: KAFKA-14849
>                 URL: https://issues.apache.org/jira/browse/KAFKA-14849
>             Project: Kafka
>          Issue Type: Bug
>          Components: consumer
>    Affects Versions: 2.5.1
>            Reporter: zou shengfu
>            Priority: Major
>         Attachments: screenshot-1.png, xaa, xab
>
>
> # At first, we modify the group.instance.id for consumers wrongly, so 
> different consumers have the same group.instance.id for a while.
> 2. After we rollbak the configuration about group.instance.id, consumers 
> receive INCONSISTENT_GROUP_PROTOCOL error even the configuration of all 
> consumers is same
> 3. Coordinator of this group accepts ten thousands of join group request from 
> consumers
> !screenshot-1.png! 
> 4. Consumers can get message normally after restarting the coordinator of 
> this group. I have upload the log about kafka broker and the group name is 
> mario_ad_stats_alo_va
> I want to know why consumer receive INCONSISTENT_GROUP_PROTOCOL error even 
> configuration of all consumers are same after rollbacking the modification 
> about group.instance.id, and I use the static membership and cooperative 
> rebalance at the same time



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