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Comment by koolba | Hacker News Reader

This looks pretty cool. Any idea of which database they're doing this on?

I don't see it listed out in the article anywhere. I would guess it's a FOSS database (i.e. either Postgres or MySQL) but also wouldn't be surprised if at their scale they've created something entirely in house.

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Actually, I am wondering if it has something to do with Hadoop and/or Apache Spark. The reason for that is that they mention Hive, Spark and Impala which are all SQL engines that live on top of Hadoop. Since the Hadoop ecosystem is mostly all open source, it would make sense that one could go fiddle with these open source optimizers to make this happen.

MySQL is dominant in China Internet companies.

That's pretty interesting. Do you have a source for that?

NOTE: most of these website are in Chinese

Taobao http://mysql.taobao.org/index.php?title=首页 360buy http://www.infoq.com/cn/articles/exploration-of-distributed-...

Tencent http://tencentdba.com

DiDi http://os.51cto.com/art/201604/508514.htm

"Tencent is using PostgreSQL for data mart in their big data system" - https://pgconf.ru/en/2016/89691

I would say mysql is dominant in general.

> Postgres is getting its momentum in China, especially in 2015, one of the biggest insurance company is adopting Postgres, and Alibaba is providing Postgres service in their public cloud, also there are a lot of significant progress about the adoption. This talk will give an overview about the Postgres adoption in 2015 in China

https://pgconf.ru/en/2016/89691

> Alibaba has provided a relational database service (RDS) for postgres in our public cloud platform (aliyun.com, the currently biggest public cloud in China). We are also enabling internal applications to use postgres in our other internet business and we can share our experience

https://pgconf.ru/en/2016/89715

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