Four short links: 19 September 2019

1. Boring Technology Behind a One-Person Startup — Just dead simple things that actually work.
2. YouTube’s Procella Database — a new query processing engine built on top of various primitives proprietary to Google. This paper stood out to me for a number of reasons: this is the SQL query engine that runs YouTube, and it has been for a number of years now, and it contains optimizations that run queries faster than BigQuery, by two orders of magnitude in some cases. Every day this software serves 100s of billions of queries that span 10 PB of data. In this blog post, I’ll pick apart the paper and compare its descriptions to my understanding of various Hadoop-related technologies.
3. Observations on Technology Use in Hong Kong Protests (Maciej Ceglowski) — Telegram is the preferred messenger app among protesters. It’s used for one-on-one messaging between people, among small groups of people to coordinate, and among very large groups to amplify and disseminate information. The polls feature in Telegram is also a way of affirming consensus in group decision-making.
4. Misusing Personas with the Seven Dwarfs — “Dwarf personas” focus on users’ mental states and should help us understand how they might be personally impacted by the product. They appreciate that users are complex and can’t always be represented by a single persona.

from Radar https://ift.tt/2IdJych