Top K Leaderboard

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Hybrid Approach\n- All write requests are queued in kafka.\n- Consumers update Redis ZSET in real-time.\nWrite scores to durable DB (Spanner, Postgres, Cassandra)\n- Redis serves reads, DB serves as fallback and historical source.\n- Periodic jobs snapshot Redis -> DB or vice versa for consistency.\n\nPro: Redis instantly reflects score changes\n +No Data loss\n + Kafak, Redis CLuster, and DBs can all scale independently\n + TTL on Keys: expire after 1 day/week/month\nCons: Complex Architecture + If Redis consumer lags, leaderboard may be stale+\nIf data not present in redis, we need to query db", "fontSize": 20, "fontFamily": 5, "textAlign": "left", "verticalAlign": "top", "containerId": null, "originalText": "3. 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