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https://issues.apache.org/jira/browse/KAFKA-14443?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17644530#comment-17644530
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Chris Egerton commented on KAFKA-14443:
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Merged and backported the fix to the 3.4 release branch.
> Mirror Maker Connectors leak admin clients used for topic creation
> ------------------------------------------------------------------
>
> Key: KAFKA-14443
> URL: https://issues.apache.org/jira/browse/KAFKA-14443
> Project: Kafka
> Issue Type: Bug
> Components: mirrormaker
> Reporter: Greg Harris
> Assignee: Greg Harris
> Priority: Blocker
> Fix For: 3.4.0
>
>
> the MirrorMaker connectors are each responsible for creating internal topics.
> For example, the Checkpoint connector creates a forwarding admin and passes
> it to a method to create the topic, but never closes the ForwardingAdmin or
> delegate objects:
> [https://github.com/apache/kafka/blob/13c9c78a1f4ad92023e8354069c6817b44c89ce6/connect/mirror/src/main/java/org/apache/kafka/connect/mirror/MirrorCheckpointConnector.java#L161-L164]
> Instead, this object should be intentionally closed when it is no longer
> needed, to prevent consuming resources in a running MM2 application.
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