Distributed Systems
Idempotency Keys for Distributed Systems
Idempotency keys make retried requests safe so a timed-out payment or duplicate POST applies exactly once. The design, storage, and TTL decisions that matter.
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Distributed Systems
Sharding Strategies Before You Need Them
Pick database sharding strategies before traffic forces your hand. Shard keys, hash vs range vs directory, online resharding, and the traps that bite early.