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Posted to dev@flink.apache.org by "Aleksandr Savonin (Jira)" <ji...@apache.org> on 2026/05/21 13:56:00 UTC

[jira] [Created] (FLINK-39723) KafkaTableITCase.testExactlyOnceSink fails due to transactional ID reuse across test runs

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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