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https://issues.apache.org/jira/browse/KAFKA-19201?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17948143#comment-17948143
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Sushant Mahajan commented on KAFKA-19201:
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https://github.com/apache/kafka/pull/19559
> Handle deletion of a topic which has initialised share-group state
> ------------------------------------------------------------------
>
> Key: KAFKA-19201
> URL: https://issues.apache.org/jira/browse/KAFKA-19201
> Project: Kafka
> Issue Type: Sub-task
> Reporter: Andrew Schofield
> Assignee: Sushant Mahajan
> Priority: Major
>
> When a user topic which has been consumed in a share group is deleted, it is
> necessary to clean up the associated records on the share-group state topic.
> This could be driven from the GC or from the SC itself. Right now, the
> records remain forever, as do the ShareGroupStatePartitionMetadata entries
> for deleted topics. The SharePartitionManager does respond to topic deletion
> by observing metadata changes.
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