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Go + Redis Distributed Lock
Interview notes on Go + Redis distributed locks. Covers: why a distributed lock is needed, atomic locking with SET NX EX, Lua-script unlock, expiry and watchdog renewal, master-replica failover and Redlock. Why you need a distributed lock sync.Mutex only protects goroutines inside one process: the lock state lives in memory that other processes can’t see. Once a service runs on multiple instances, the same logic executes in several processes (possibly on several machines) with no shared memory, …
