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FREE · TOPIC 133

Flash Sale Inventory Locking

666 words·Updated 2026-07-18·

#system-design#concurrency#flash-sale#locking

Accompanying Lab

TTL Cache Reaper

An in-memory TTL cache that stores absolute expiry timestamps, enforces lazy expiration on reads, and reclaims memory with active sweeps.

Primary References & Engineering Sources

·[[wiki/arpit-information-retrieval-systems-ii]]
·https://redis.io/docs/latest/develop/clients/patterns/distributed-locks/
·https://docs.aws.amazon.com/AWSSimpleQueueService/latest/SQSDeveloperGuide/FIFO-queues-exactly-once-processing.html

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Fixed Block Chunking And Content Addressing

Geofencing Point In Polygon