All 7 Distributed Locks with Redis questions
More in Distributed Locks with Redis
How do you implement a basic distributed lock in Redis using the SET command with NX and EX options? Why is it important to release a distributed lock using a script that verifies you are actually the current lock owner, rather than a simple DELETE command? What happens if the process holding a distributed lock crashes or hangs before it finishes its work and releases the lock? What are some common mistakes developers make when implementing distributed locks with Redis, and how do you avoid them? What is the Redlock algorithm, and why was it proposed for implementing distributed locks across multiple independent Redis instances? How would you design a distributed lock implementation that supports safely extending the lock's expiration time if the protected operation needs more time than originally expected?
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What is a distributed lock, and why would an application need one when using Redis?

Beginner

Answer

A distributed lock ensures that only one process or server, out of potentially many running the same application, can perform a specific action at a time, which is important when multiple application instances share access to a common resource and you need to prevent them from all trying to modify it simultaneously.
SET lock:inventory:product123 'owner1' NX EX 10
Real-world example An order processing system running on several servers uses a distributed lock to ensure only one server at a time updates a specific product's inventory count, preventing two servers from accidentally overselling the same limited stock.

Common follow-ups: What happens if the process holding the lock crashes before releasing it?;How is a distributed lock different from a lock used within a single application process?

Rate Limiting with Redis;Session Management with Redis
All 7 Distributed Locks with Redis questions