rdhabalia commented on issue #1462: Delayed acks impl URL: https://github.com/apache/incubator-pulsar/pull/1462#issuecomment-403660668 > The code should already be sending 1 single ack if the broker is < 2.0 : I see, I missed it to check. I think the issue is that I have cherry-picked [ActiveConsumerListener-change](https://github.com/apache/incubator-pulsar/pull/1156) into broker-1.22 to support function on broker-1.22 and this PR upgraded pulsar-broker version=`V12` and because of that client was sending group-ack to broker which broker couldn't understand. Thanks for pointing it out, I will fix internal broker's patch.
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