Xuanwu Backend Tech Stack

Jun 15, 2025 · Backend Development

Understanding Zookeeper’s One‑Time Watch and Persistent Listener Techniques

This article explains why Zookeeper's watch mechanism triggers only once, outlines the performance, reliability, and design reasons behind it, describes its asynchronous eventual consistency, and provides Java code examples for basic watches, manual re‑registration, and using the Curator framework for persistent listeners.