merlimat opened a new pull request #1462: Delayed acks impl URL: https://github.com/apache/incubator-pulsar/pull/1462 ### Motivation This PR is based on top of #1450. I'll rebase once first one is merged. The processing of acknowledgments constitutes is broker a big chunk of CPU work. Even then, we throttle the persistence of acks to BK (default is once per sec). In addition to that, acknowledgments generates a large number of very small IP packets and these are most expensive to process by OS/NIC (compared to fewer bigger packets). This change introduces client side batching for acknowledgments. By default client, will group the acks and send out a single protobuf command every 100ms. Consumer can configure the delay, or set it to 0 to fall back to original behavior.
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