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https://issues.apache.org/jira/browse/FLINK-23183?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17392843#comment-17392843
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Arvid Heise commented on FLINK-23183:
-------------------------------------
Merged into master as 900af3e43eb34f8899a4509a8f6c8e43d72f1cc8, into 1.13 as
0ecb730e569de59b2e60a96405d8b138634b29b2, and into 1.12 as
7e17c1d19da0e2330c508928cd3f1fc1e9494d03. Thank you very much!
> Lost ACKs for redelivered messages in RMQSource
> ------------------------------------------------
>
> Key: FLINK-23183
> URL: https://issues.apache.org/jira/browse/FLINK-23183
> Project: Flink
> Issue Type: Bug
> Components: Connectors/ RabbitMQ
> Affects Versions: 1.13.1, 1.12.4
> Reporter: Michał Ciesielczyk
> Assignee: Michał Ciesielczyk
> Priority: Major
> Labels: pull-request-available
>
> 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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