intermediateMultithreading & Concurrency371 of 436
Why does a distributed application need a different locking approach than a single JVM? What is a distributed lock and when do you actually need one?
Tests whether you know in-JVM locks only coordinate threads sharing the same memory, so multiple instances need an external coordination point (Redis, ZooKeeper, DB row lock) -- and that you should reach for one only when true cross-instance mutual exclusion is required, not as a default.
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