merlimat commented on issue #3703: Added support for "negative acks" in Java client URL: https://github.com/apache/pulsar/pull/3703#issuecomment-467985397 > how about calling `delayedAck` instead `negativeAck`? This is not delaying the ack (which is something we already have as an internal optimization, see https://pulsar.apache.org/api/client/org/apache/pulsar/client/api/ConsumerBuilder.html#acknowledgmentGroupTime-long-java.util.concurrent.TimeUnit- ). Rather this is signaling the failure to process. After the timeout since the nack is called, the message will not be automatically acked, but rather re-delivered. Also see these links for terminology context: * https://en.wikipedia.org/wiki/Acknowledgement_(data_networks) * https://www.rabbitmq.com/nack.html
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