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Posted to issues@nifi.apache.org by "Pierre Villard (Jira)" <ji...@apache.org> on 2026/01/14 15:30:00 UTC

[jira] [Created] (NIFI-15464) ConsumeKafka processor causes duplicate message processing during consumer group rebalance due to missing offset commit in onPartitionsRevoked

Pierre Villard created NIFI-15464:
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             Summary: ConsumeKafka processor causes duplicate message processing during consumer group rebalance due to missing offset commit in onPartitionsRevoked
                 Key: NIFI-15464
                 URL: https://issues.apache.org/jira/browse/NIFI-15464
             Project: Apache NiFi
          Issue Type: Bug
            Reporter: Pierre Villard
            Assignee: Pierre Villard


The new ConsumeKafka processor (using Kafka3ConnectionService) causes duplicate message processing when a consumer group rebalance occurs (e.g., when a consumer starts or stops). Unlike the legacy ConsumeKafka_2_6 processor which commits pending offsets during the onPartitionsRevoked callback, the new Kafka3ConsumerService only performs a rollback, causing uncommitted but already-processed messages to be reprocessed by other consumers in the group.



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