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https://issues.apache.org/jira/browse/KAFKA-15605?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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David Arthur resolved KAFKA-15605.
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Fix Version/s: 3.7.0
Resolution: Fixed
> Topics marked for deletion in ZK are incorrectly migrated to KRaft
> ------------------------------------------------------------------
>
> Key: KAFKA-15605
> URL: https://issues.apache.org/jira/browse/KAFKA-15605
> Project: Kafka
> Issue Type: Bug
> Components: controller, kraft
> Affects Versions: 3.6.0
> Reporter: David Arthur
> Assignee: David Arthur
> Priority: Major
> Fix For: 3.7.0, 3.6.1
>
>
> When migrating topics from ZooKeeper, the KRaft controller reads all the
> topic and partition metadata from ZK directly. This includes topics which
> have been marked for deletion by the ZK controller. After being migrated to
> KRaft, the pending topic deletions are never completed, so it is as if the
> delete topic request never happened.
> Since the client request to delete these topics has already been returned as
> successful, it would be confusing to the client that the topic still existed.
> An operator or application would need to issue another topic deletion to
> remove these topics once the controller had moved to KRaft. If they tried to
> create a new topic with the same name, they would receive a
> TOPIC_ALREADY_EXISTS error.
> The migration logic should carry over pending topic deletions and resolve
> them either as part of the migration or shortly after.
> *Note to operators:*
> To determine if a migration was affected by this, an operator can check the
> contents of {{/admin/delete_topics}} after the KRaft controller has migrated
> the metadata. If any topics are listed under this ZNode, they were not
> deleted and will still be present in KRaft. At this point the operator can
> make a determination if the topics should be re-deleted (using
> "kafka-topics.sh --delete") or left in place. In either case, the topics
> should be removed from {{/admin/delete_topics}} to prevent unexpected topic
> deletion in the event of a fallback to ZK.
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