adaiboy edited a comment on issue #183: support Cumulative ack URL: https://github.com/apache/pulsar-client-go/issues/183#issuecomment-585606987 > The cumulative ack was left out on purpose and the reasoning was (in weighted order): > > * Keep things simple in API > * Keep things simple in client impl > * Cumulative ack doesn't provide much more performance/effciency > * Sequential individual acking will be equivalent i have doubts with the " doesn't provide much more peformance" than individual ack - Cumulative ack doesn't provide much more performance/effciency - Sequential individual acking will be equivalent i set up a test cluster, with a persistent topic , just one subscription with exclusive type, though some config in broker not be perfect, but i tuned the configure some days according to the source code and i make a test with the test cluster <img width="396" alt="截屏2020-02-1316 09 59" src="https://user-images.githubusercontent.com/3397286/74414209-ea798d80-4e7b-11ea-83a9-c1ccaa9432d8.png";> first, i modified the consumer-series add AckCumulative to compare cumulative ack with individual ack and make a producer send msg with best effort then, use cumulative consumer to consume entry , and cumulative ack when 10000 entries received, the consumer can catch the producer lastly, clear all. restart the producer, but start a consumer with individual ack just in the red frame， the consumer is much slower than producer - the produce speed is the green line - the consume speed is the yellow line as every ack is a "rpc" with CommandAck, the reduce the ack cnt will be usefull in theory.
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