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@prologic@twtxt.net I am seeing a problem in which not-so-active users, such as myself, are ending up having a blank “Recent twts from…” under their profiles because, I assume, the cache long expired. What can be done about it? Business personalities such as myself can’t be around here that often! Could something be implemented so that, say, the last 10 or 20 twts are always visible under one’s profile? Neep-gren!

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“爆到天际线” - TiDB 2021 Hackathon 决赛不负责任点评
作者介绍：唐刘，PingCAP VP of Engineering，TiDB Hackathon 2021 特邀评委。

TiDB 2021 Hackathon 终于落下帷幕，最开始我还担心，今年 Hackathon 还有啥东西能出来，结果却大大超出我的预期，很多项目真的能用惊艳来形容，大家都在自嘲，说『内卷得太厉害』。作为评委，全程参与了预赛内核组以及决赛的答辩，还是有很多感触的，之前已经写了一篇预赛的点评（点击文末 “阅读原文” 即可查看），这次也对决赛做一次不负责任的点评。

决赛这次有 20 个项目，我大概分几个维度做一个统一介绍。

性能/功能增强

这次在 TiDB 内核上，做的不少性能提升功能真的很惊艳，因为我预赛点评的主要是内核组的东西，所以在这里简单进行一下汇总。

增量 Analytic Table

这个功能通过 Region Cache 统计信息的方式来加速全表的 analyze，在表越大的情况下，收益会越加明显。一方面加速了 analyze 的速度，另外一方面也能缓解 analyze 造成的大量 IO 和 CPU 开销，降低了系统的压力。不过这个实现有一个前提假设，就 … ⌘ Read more

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