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https://issues.apache.org/jira/browse/KAFKA-7831?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16787360#comment-16787360
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ASF GitHub Bot commented on KAFKA-7831:
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hachikuji commented on pull request #6221: KAFKA-7831; Do not modify
subscription state from background thread
URL: https://github.com/apache/kafka/pull/6221
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> Consumer SubscriptionState missing synchronization
> --------------------------------------------------
>
> Key: KAFKA-7831
> URL: https://issues.apache.org/jira/browse/KAFKA-7831
> Project: Kafka
> Issue Type: Bug
> Reporter: Jason Gustafson
> Assignee: Jason Gustafson
> Priority: Major
>
> ConsumerCoordinator installs a Metadata.Listener in order to update pattern
> subscriptions after metadata changes. The listener is invoked from
> NetworkClient.poll, which could happen in the heartbeat thread. Currently,
> however, there is no synchronization in SubscriptionState to make this safe.
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