Aleksandr Savonin created FLINK-39723:
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Summary: KafkaTableITCase.testExactlyOnceSink fails due to
transactional ID reuse across test runs
Key: FLINK-39723
URL: https://issues.apache.org/jira/browse/FLINK-39723
Project: Flink
Issue Type: Bug
Components: Connectors / Kafka
Reporter: Aleksandr Savonin
KafkaTableITCase.testExactlyOnceSink intermittently fails in CI with
ProducerFencedException caused by transactional producer state leaking between
test runs on the same Kafka broker instance.
Observed in: CI run
https://github.com/apache/flink-connector-kafka/actions/runs/26227821749
Ideas/potential fixes to think about:
- Use randomized/unique transactional ID prefixes per test run (similar to how
topic names already use random UUIDs)
- Or explicitly abort any open transactions with the same ID before the test
starts
- Or ensure the Kafka container is fully restarted between parameterized
variants that share transactional ID space
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