{"type":"excalidraw","version":2,"source":"https://AwesomeSystemDesign.dev","elements":[{"angle":0,"strokeColor":"#6577aa","backgroundColor":"#eef1fc","fillStyle":"solid","strokeWidth":1.5,"strokeStyle":"solid","roughness":0.7,"opacity":100,"version":1,"versionNonce":1,"isDeleted":false,"groupIds":["step-1"],"frameId":null,"roundness":null,"boundElements":[{"type":"text","id":"shape-1"}],"updated":0,"link":null,"locked":false,"id":"shape-0","type":"rectangle","seed":41,"x":16,"y":16,"width":288,"height":293.40000000000003,"customData":{"revealStep":1}},{"angle":0,"strokeColor":"#394557","backgroundColor":"transparent","fillStyle":"solid","strokeWidth":1.5,"strokeStyle":"solid","roughness":0.7,"opacity":100,"version":1,"versionNonce":1,"isDeleted":false,"groupIds":["step-1"],"frameId":null,"roundness":null,"boundElements":null,"updated":0,"link":null,"locked":false,"id":"shape-1","type":"text","seed":114,"x":36,"y":34,"width":248,"height":257.40000000000003,"fontSize":22,"fontFamily":1,"text":"Problem: Requests\nfor keys that DON'T\nEXIST in DB either\n→ Every request is a\ncache miss + DB\nmiss → wasted\nresources\n→ Can be weaponized\nas a DoS attack","originalText":"Problem: Requests\nfor keys that DON'T\nEXIST in DB either\n→ Every request is a\ncache miss + DB\nmiss → wasted\nresources\n→ Can be weaponized\nas a DoS 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1: Cache Null\nResults\nDB returns NULL for\nuser:999999 → cache\nSET user:999999\n\"NULL\" EX 60\nNext request → cache\nHIT → return \"not\nfound\" without hitting\nDB\n→ Short TTL in case\ndata is added later","originalText":"Solution 1: Cache Null\nResults\nDB returns NULL for\nuser:999999 → cache\nSET user:999999\n\"NULL\" EX 60\nNext request → cache\nHIT → return \"not\nfound\" without hitting\nDB\n→ Short TTL in case\ndata is added 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Bloom\nFilter","textAlign":"left","verticalAlign":"middle","containerId":"shape-4","lineHeight":1.3,"autoResize":false,"customData":{"revealStep":3}},{"angle":0,"strokeColor":"#9180ac","backgroundColor":"#f4effb","fillStyle":"solid","strokeWidth":1.5,"strokeStyle":"solid","roughness":0.7,"opacity":100,"version":1,"versionNonce":1,"isDeleted":false,"groupIds":["step-4"],"frameId":null,"roundness":null,"boundElements":[{"type":"text","id":"shape-7"}],"updated":0,"link":null,"locked":false,"id":"shape-6","type":"rectangle","seed":479,"x":16,"y":913.8000000000001,"width":288,"height":121.8,"customData":{"revealStep":4}},{"angle":0,"strokeColor":"#394557","backgroundColor":"transparent","fillStyle":"solid","strokeWidth":1.5,"strokeStyle":"solid","roughness":0.7,"opacity":100,"version":1,"versionNonce":1,"isDeleted":false,"groupIds":["step-4"],"frameId":null,"roundness":null,"boundElements":null,"updated":0,"link":null,"locked":false,"id":"shape-7","type":"text","seed":552,"x":36,"y":931.8000000000001,"width":248,"height":85.8,"fontSize":22,"fontFamily":1,"text":"Bloom Filter (all\nvalid keys\npre-loaded)","originalText":"Bloom Filter (all\nvalid 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any cache/DB\nquery:\nif NOT\nbloom_filter.might_co\nntain(key):\nreturn \"not found\"\nimmediately","originalText":"Before any cache/DB\nquery:\nif NOT\nbloom_filter.might_co\nntain(key):\nreturn \"not 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~1 GB for 1\nbillion keys at 1% FP\nSpeed: O(k) lookups,\nk = hash functions","originalText":"Space: ~1 GB for 1\nbillion keys at 1% FP\nSpeed: O(k) lookups,\nk = hash 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positive rate:\n1% → 1% of\nnon-existent keys\nstill hit DB\nFalse negative rate:\n0% → never blocks a\nvalid key","originalText":"False positive rate:\n1% → 1% of\nnon-existent keys\nstill hit DB\nFalse negative rate:\n0% → never blocks a\nvalid key","textAlign":"left","verticalAlign":"middle","containerId":"shape-12","lineHeight":1.3,"autoResize":false,"customData":{"revealStep":7}}],"appState":{"viewBackgroundColor":"#fbfbf8","gridSize":null},"files":{}}