Message Acknowledgment

Tencent Cloud Developer

Dec 24, 2021 · Cloud Native

Deep Dive into Apache Pulsar Message Acknowledgment Mechanism

Apache Pulsar ensures reliable delivery by letting consumers acknowledge messages individually, cumulatively, or within batches, while also supporting negative acknowledgments and sophisticated tracking mechanisms that batch ack requests, use BitSet for batch indexes, and employ time‑wheel‑based redelivery for unacknowledged messages.

Apache PulsarConsumer TrackerDistributed Messaging

0 likes · 10 min read

Deep Dive into Apache Pulsar Message Acknowledgment Mechanism

High Availability Architecture

Dec 24, 2021 · Backend Development

Understanding Broker‑Side Message Acknowledgment and Cursor Management in Apache Pulsar

This article explains how Apache Pulsar brokers track consumer acknowledgment using cursors, describes persistent and non‑persistent subscription differences, details cursor metadata stored in ZooKeeper and BookKeeper, and outlines optimizations for handling message gaps, including RangeSet improvements and a new LRU‑based storage design.

Apache PulsarBookKeeperBroker

0 likes · 12 min read

Understanding Broker‑Side Message Acknowledgment and Cursor Management in Apache Pulsar