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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. -- This message was sent by Atlassian Jira (v8.3.4#803005)