The Problem We Were Actually Solving
We ran Veltrix, a Hytale server network with 14 shards across three continents. Our player count spiked past 800 concurrent every Friday at 7 PM UTC, and every spike meant 70% more rediscovered chests via the treasure hunt system. The docs promised linear scalability—just add more Redis instances, partition by player ID, and call it a day.
The docs lied.
The treasure hunt system isnt a caching layer. Its a state machine with hidden dependencies. Each chest has a loot tier (0–5), a spawn epoch, and a pickup expiration window. The engine assumes tier 5 chests only spawn in biomes with loot tier 5. But our server ran custom biomes—volcanic flats, corrupted ruins, player-built arenas. The engine didnt validate these. It assumed the client sent the right tier. The client lies.
So we got corrupted cache entries. Then cache poisoning. Then deserialization explosions that locked the entire hunt system for 47 minutes while players reported missing chests. Our on-call rotation learned to ignore the PagerDuty alert and just restart the hunt process manually—twice per weekend.
