gmethvin commented on issue #5891: Dead letters incorrect processed for messages batch URL: https://github.com/apache/pulsar/issues/5891#issuecomment-570005738 I also noticed this after reporting essentially the same issue as #5969. I’d argue it’s a bug because the consumer APIs are defined on messages, not batches. At the very least it’s a bug because the documentation does not mention batches at all and suggests only the negatively acknowledged message will be redelivered. Even if the current behavior were correctly documented, though, it makes negative acknowledgements much less useful, as it puts an extra burden on the consumer of tracking duplicates.
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