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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