Understanding Redisson Distributed Locks: Architecture, Reentrancy, Fairness, and WatchDog Mechanism
This article explains Redisson's role as a Java in‑memory data grid built on Redis, compares it with Jedis and Lettuce, and details how Redisson implements distributed locks—including simple lock/unlock, Lua‑based reentrant locks, automatic lock renewal (WatchDog), and a fair lock using Redis lists and sorted sets—providing complete code examples and execution flow.