Viewing profile — quinthar

I had some free time this holiday season and wrote up a blog post about how we use NUMA balancing on our 384-CPU, 6TB monster servers to keep the site humming reliably (and some of…

we have been using this page locking technology for quite a while now and it works incredibly well. Having both read and write concurrency is super powerful and scales fantasticall…

It's scales so perfectly we are deploying it across 3 datacenters, each with four 384 core machines with 3 terabytes of RAM. I can't speak highly enough about sqlite and the team b…

Expensify is powered entirely using sqlite (inside bedrockdb.com) and it is freaking amazing.

At Expensify we have been astonished by how easy it was to set up -- as simple as ssh -- and its incredible performance relative to OpenVPN. It's night and day due to it's multi th…

I think a big challenge (and perhaps the root problem) is weighing the relative importance of different relative changes. Car deaths are down 97%, but suicides are up 30%. On balan…

This is a much, much better rebuttal than the other one. Thanks!

Hmm how is this a good rebuttal? I haven't read the book, but the original article is based primarily on clear assertions of fact and statistics. A "good rebuttal" world presumably…

Fyi, Expensify uses sqlite as it's primary database in a HA clustered way, see bedrockdb.com for more details.

I think salary notifications in general are a sign of the company compensating in a fundamentally unfair way. Unless you are being hired to negotiate, paying you based on your nego…

Cool! Also, you might take a look at http://bedrockdb.com for a geo-replicated, ACID, SQL database (basically a replication layer atop SQLite).

Well if the rules are: - Libraries must be usable from C or C++, ideally both - Libraries should be usable from more than one platform (ideally, all major desktops and/or all major…

In the FAQ it just says "Come on" for SQLite included in the list. Can you provide a bit more detail? This feels like a pretty great option to include here.

We're using GitHub Issues: https://github.com/Expensify/Bedrock/issues However, honestly those specific issues aren't on the list. In general we focus less on what could happen, an…

And a bit more here: http://bedrockdb.com/synchronization.html

Cool. It looks like they have 500-1000 Android installs. As context, Expensify has over 1M Android installs, and over 4M total users. So I think Bedrock is probably operating 4-5 o…

Ah, sorry for the confusion. Every transaction is given an incrementing ID by the leader, and every follower commits the transactions in ID order. Furthermore, every commit has a r…

> What do you do during index creation: Do you drop write requests on the floor? Do you store them in a persistent queue somewhere? Or do you remove a node from the cluster, create…

To be clear, we're talking about functionality that is not implemented or fully designed. Today all transactions are committed on all nodes in the same order, which is a much simpl…

Correct!

Lots of comments! I'll try to address the key points: Re: "brand new technology not yet in trunk" -- I'm not sure what you mean by that. Bedrock has been used continuously for 8 ye…

Unfortunately you can't add new nodes without reconfiguring the cluster, and currently that requires restarting each server (though so long as you don't do it all at once, server r…