hard20 pts · first answer countsdatabasesdistributed-locksconcurrency

Two workers both think they hold the lock

Worker A takes a Redis lock with a 10-second TTL, then pauses for 15 seconds in garbage collection. Worker B takes the lock. A wakes and writes to storage. What prevents A's stale write?

A.A longer TTL of 20 seconds for every lockB.Deleting the lock key before each writeC.Running both workers on the same serverD.A fencing token that storage checks on writes

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Two workers both think they hold the lock

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