What Are Acknowledgments? When a producer sends a record to a Kafka broker, it can wait for confirmation that the write was received and replicated before considering the send “complete.” The acks setting controls how much confirmation the producer requires. flowchart LR Producer["Producer"] Leader["Partition Leader\n(Broker 1)"] F1["Follower\n(Broker 2)"] F2["Follower\n(Broker 3)"] Producer -->|"ProduceRequest"| Leader Leader -->|"replicate"| F1 Leader -->|"replicate"| F2 Leader -->|"ProduceResponse ✓"| Producer style Producer fill:#3b82f6,color:#fff style Leader fill:#10b981,color:#fff The acknowledgment is the broker’s confirmation to the producer.