[jira] [Commented] (KAFKA-7831) Consumer SubscriptionState missing synchronization

["ASF GitHub Bot (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/KAFKA-7831?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16787360#comment-16787360 ] 

ASF GitHub Bot commented on KAFKA-7831:
---------------------------------------

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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