[GitHub] [pulsar] sijie commented on a change in pull request #3750: Negative acks in C++ client

[GitBox <gi...@apache.org>]

sijie commented on a change in pull request #3750: Negative acks in C++ client
URL: https://github.com/apache/pulsar/pull/3750#discussion_r262797484
 
 

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 File path: pulsar-client-cpp/include/pulsar/c/consumer.h
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 @@ -164,6 +164,21 @@ void pulsar_consumer_acknowledge_cumulative_async_id(pulsar_consumer_t *consumer
                                                      pulsar_message_id_t *messageId,
                                                      pulsar_result_callback callback, void *ctx);
 
+/**
+ * Acknowledge the failure to process a single message.
+ * <p>
+ * When a message is "negatively acked" it will be marked for redelivery after
+ * some fixed delay. The delay is configurable when constructing the consumer
+ * with {@link ConsumerConfiguration#setNegativeAckRedeliveryDelayMs}.
+ * <p>
+ * This call is not blocking.
+ *
+ * @param message
+ *            The {@code Message} to be acknowledged
+ */
+void pulsar_consumer_negative_acknowledge(pulsar_consumer_t *consumer, pulsar_message_t *message);
+void pulsar_consumer_negative_acknowledge_id(pulsar_consumer_t *consumer, pulsar_message_id_t *messageId);
 
 Review comment:
   comments?

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