Precomputed Read View

设计搜索栏背后的自动完成／即打即现（typeahead）系统：在 50ms 以内的预算里，为一个局部前缀返回 top-K 查询建议，且要在大型搜索引擎的规模下做到。

设计 TikTok 的 For You 信息流——为每位用户排序并推送源源不断的个性化短视频流，完全不依赖他关注了谁。

设计Tinder。请覆盖Swipe ingestion as a high-volume, append-only event write path (like/pass events) decoupled from match detection, Match detection: checking whether A likes B AND B likes A, where that...