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Distributed Systems · hard

2. Distributed Locking (Redlock) & Atomic Lua Scripts

Eliminating race conditions across microservices.

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Redis executes Lua scripts atomically (`EVAL`), ensuring no other command can interleave. Distributed locks use `SET resource_key my_random_token NX PX 30000` and unlock using Lua scripts to verify token ownership before releasing.

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Check your understanding

1. Why must distributed lock releases in Redis use a Lua script?
To atomically verify that the caller still owns the lock token before deleting the keyTo encrypt the tokenTo pay transaction feesTo reset server clock

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