youurayy edited a comment on issue #6157: Failing to cumulative acknowledge messages as old as 15 seconds URL: https://github.com/apache/pulsar/issues/6157#issuecomment-581859121 @codelipenghui please try to run the above example code (for a longer time, e.g. 1 minute), and tell me why the messages are **not** getting acknowledged. If you let the example running, the number of messages that **fail to acknowledge** _increases_. When a cumulative acknowledgement request is issued (by `consumer.acknowledgeCumulativeAsync(messageId)`), **all** previous messages must be acknowledged by the broker. This however is not happening.
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