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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