[jira] [Resolved] (KAFKA-13155) ConcurrentModificationException in TransactionalMessageCopier

["Jason Gustafson (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/KAFKA-13155?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Jason Gustafson resolved KAFKA-13155.
-------------------------------------
    Resolution: Fixed

> ConcurrentModificationException in TransactionalMessageCopier
> -------------------------------------------------------------
>
>                 Key: KAFKA-13155
>                 URL: https://issues.apache.org/jira/browse/KAFKA-13155
>             Project: Kafka
>          Issue Type: Bug
>            Reporter: Jason Gustafson
>            Assignee: Jason Gustafson
>            Priority: Major
>
> Caught this exception in a system test run:
> {code}
> [2021-08-02 07:51:54,528] ERROR Uncaught exception in thread 'transactional-message-copier-shutdown-hook': (org.apache.kafka.common.utils.KafkaThread)
> java.util.ConcurrentModificationException: KafkaConsumer is not safe for multi-threaded access
>         at org.apache.kafka.clients.consumer.KafkaConsumer.acquire(KafkaConsumer.java:2447)
>         at org.apache.kafka.clients.consumer.KafkaConsumer.close(KafkaConsumer.java:2330)
>         at org.apache.kafka.clients.consumer.KafkaConsumer.close(KafkaConsumer.java:2308)
>         at org.apache.kafka.tools.TransactionalMessageCopier.lambda$main$1(TransactionalMessageCopier.java:331)
>         at java.lang.Thread.run(Thread.java:748)
> {code}
> The pattern for closing the consumer is not safe.



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