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Posted to jira@kafka.apache.org by "Jason Gustafson (Jira)" <ji...@apache.org> on 2021/08/02 22:48:00 UTC

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

Jason Gustafson created KAFKA-13155:
---------------------------------------

             Summary: ConcurrentModificationException in TransactionalMessageCopier
                 Key: KAFKA-13155
                 URL: https://issues.apache.org/jira/browse/KAFKA-13155
             Project: Kafka
          Issue Type: Bug
            Reporter: Jason Gustafson


Caught this exception in a system test run:
```
[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)
```
The pattern for closing the consumer is not safe.



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