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https://issues.apache.org/jira/browse/KAFKA-20236?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18063547#comment-18063547
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David Jacot commented on KAFKA-20236:
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Hey. This was done intentionally as per KIP-848:
[https://cwiki.apache.org/confluence/display/KAFKA/KIP-848%3A+The+Next+Generation+of+the+Consumer+Rebalance+Protocol#KIP848:TheNextGenerationoftheConsumerRebalanceProtocol-DynamicGroupConfiguration]
> Allow kafka-configs.sh to delete all dynamic configs for a group
> ----------------------------------------------------------------
>
> Key: KAFKA-20236
> URL: https://issues.apache.org/jira/browse/KAFKA-20236
> Project: Kafka
> Issue Type: New Feature
> Reporter: Chia-Ping Tsai
> Assignee: Jhen-Yung Hsu
> Priority: Minor
> Labels: need-kip
>
> Currently, deleting a group does not automatically remove its associated
> dynamic configurations, leaving orphaned configs in the cluster. This not
> only consumes space, but may also cause unexpected behavior if a new group is
> created with the same name.
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