codelipenghui commented on issue #5755: UnAckedMessages admin information not correct URL: https://github.com/apache/pulsar/issues/5755#issuecomment-560181164 @Fomal-haut the the unackMessages represent the messages already dispatched to the consumer but the consumer have not acked, the backlog is the total remaining messages of the subscription. So the messages which not deliver to consumers will not be contains by unAckMessages. The negative number of unAckedMessages looks weird, is your client version also 2.4.1?
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