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Posted to dev@flink.apache.org by "Michał Ciesielczyk (Jira)" <ji...@apache.org> on 2021/06/29 11:59:00 UTC

[jira] [Created] (FLINK-23183) Lost ACKs for redelivered messages in RMQSource

Michał Ciesielczyk created FLINK-23183:
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             Summary: Lost ACKs for redelivered messages in RMQSource 
                 Key: FLINK-23183
                 URL: https://issues.apache.org/jira/browse/FLINK-23183
             Project: Flink
          Issue Type: Sub-task
          Components: Connectors/ RabbitMQ
    Affects Versions: 1.12.4, 1.13.1
            Reporter: Michał Ciesielczyk


As described in the FLINK-20244, the redelivered messages are not acknowledged properly (only applicable when autoAck is disabled). When used with a prefetch count in the consumer it may even lead to stop the source to consume any more messages.


 The solution (proposed in FLINK-20244) should resolve the issue. All successfully consumed RMQ messages should be acknowledged, regardless of whether the message is ignored or processed further in the pipeline. The {{sessionIds.add(deliveryTag)}} ([RMQSource.java#L423|https://github.com/apache/flink/blob/master/flink-connectors/flink-connector-rabbitmq/src/main/java/org/apache/flink/streaming/connectors/rabbitmq/RMQSource.java#L423]) should be called before checking if the message has already been processed.



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