AJR
@andrewrepp.com
Database nerd. Working on Hyperdrive at Cloudflare. Formerly on the Greenplum Kernel Team.
Also LoL and MtG, because I am a cliche.
Also LoL and MtG, because I am a cliche.
Reposted by AJR
A step-by-step guide to building a key-value database from scratch: www.nan.fyi/database - love the explainer/interactive animation in this
November 14, 2025 at 4:27 PM
A step-by-step guide to building a key-value database from scratch: www.nan.fyi/database - love the explainer/interactive animation in this
Reposted by AJR
It is 1998. I am at the kitchen table writing Batman fanfic but I keep getting distracted by breaking news about a Bill Clinton sex scandal
It is 2025. I am at the kitchen table writing a canonical Bat-book but I keep getting distracted by breaking news about a Bill Clinton sex scandal
It is 2025. I am at the kitchen table writing a canonical Bat-book but I keep getting distracted by breaking news about a Bill Clinton sex scandal
November 15, 2025 at 1:34 AM
It is 1998. I am at the kitchen table writing Batman fanfic but I keep getting distracted by breaking news about a Bill Clinton sex scandal
It is 2025. I am at the kitchen table writing a canonical Bat-book but I keep getting distracted by breaking news about a Bill Clinton sex scandal
It is 2025. I am at the kitchen table writing a canonical Bat-book but I keep getting distracted by breaking news about a Bill Clinton sex scandal
Reposted by AJR
Hello, friends! After 10(!) years of #AdventOfCode, I've made some changes to preserve my sanity: there will be 12 days of puzzles each December (still starting Dec 1) and there is no longer a global leaderboard. Read more:
adventofcode.com/2025/about#f...
adventofcode.com/2025/about#f...
adventofcode.com/2025/about#f...
adventofcode.com/2025/about#f...
October 22, 2025 at 2:32 AM
Hello, friends! After 10(!) years of #AdventOfCode, I've made some changes to preserve my sanity: there will be 12 days of puzzles each December (still starting Dec 1) and there is no longer a global leaderboard. Read more:
adventofcode.com/2025/about#f...
adventofcode.com/2025/about#f...
adventofcode.com/2025/about#f...
adventofcode.com/2025/about#f...
Reposted by AJR
It's great to see things shifting back to the principles we were promoting through the mid 2000s while working on RSS, Atom, Activity Streams, and ironically OpenSocial. Those efforts ended up being short circuited by Twitter and Facebook competing to own the walled gardens. We've come full circle.
i wrote about atproto and why it matters
Open Social — overreacted
The protocol is the API.
overreacted.io
September 27, 2025 at 3:29 AM
It's great to see things shifting back to the principles we were promoting through the mid 2000s while working on RSS, Atom, Activity Streams, and ironically OpenSocial. Those efforts ended up being short circuited by Twitter and Facebook competing to own the walled gardens. We've come full circle.
Reposted by AJR
Regarding goroutine & unbuffered channel interaction, found myself repeating this multiple times. Maybe it's time to write it down for reference.
Early return + unbuffered send = goroutine leak.
rednafi.com/go/early_ret...
#golang
Early return + unbuffered send = goroutine leak.
rednafi.com/go/early_ret...
#golang
Early return and goroutine leak
At work, a common mistake I notice when reviewing candidates’ home assignments is how they
wire goroutines to channels and then return early.
The pattern usually looks like this:
start a few goroutin...
rednafi.com
September 7, 2025 at 1:49 PM
Regarding goroutine & unbuffered channel interaction, found myself repeating this multiple times. Maybe it's time to write it down for reference.
Early return + unbuffered send = goroutine leak.
rednafi.com/go/early_ret...
#golang
Early return + unbuffered send = goroutine leak.
rednafi.com/go/early_ret...
#golang
Reposted by AJR
Reposted by AJR
America is beautiful, contradictory, unfinished. I am proud of our country even as we constantly strive to make it better, to protect and deepen our democracy, to fulfill its promise for each and every person who calls it home.
Happy Independence Day. No Kings in America.
Happy Independence Day. No Kings in America.
July 4, 2025 at 4:14 PM
America is beautiful, contradictory, unfinished. I am proud of our country even as we constantly strive to make it better, to protect and deepen our democracy, to fulfill its promise for each and every person who calls it home.
Happy Independence Day. No Kings in America.
Happy Independence Day. No Kings in America.
Reposted by AJR
Proposed incident metric: how often at least one person says "but this is impossible" when considering a theory that turns out to be true.
June 29, 2025 at 11:08 PM
Proposed incident metric: how often at least one person says "but this is impossible" when considering a theory that turns out to be true.
Reposted by AJR
“no way to prevent this” says only programming language where this regularly happens
incident report is out and this one is actually painful
Google Cloud Service Health
status.cloud.google.com
June 14, 2025 at 2:48 PM
“no way to prevent this” says only programming language where this regularly happens
Reposted by AJR
Looks like the Google Cloud incident report is out: status.cloud.google.com/incidents/ow...
A June 12 policy update with unintentional blank fields triggered a crash loop in Service Control code that lacked proper error handling, causing binaries to fail globally.
A June 12 policy update with unintentional blank fields triggered a crash loop in Service Control code that lacked proper error handling, causing binaries to fail globally.
Google Cloud Service Health
status.cloud.google.com
June 14, 2025 at 1:51 AM
Looks like the Google Cloud incident report is out: status.cloud.google.com/incidents/ow...
A June 12 policy update with unintentional blank fields triggered a crash loop in Service Control code that lacked proper error handling, causing binaries to fail globally.
A June 12 policy update with unintentional blank fields triggered a crash loop in Service Control code that lacked proper error handling, causing binaries to fail globally.
Reposted by AJR
A SIGTERM is issued by the operating system; my process effortlessly dodge rolls it, then immediately executes a perfect parry against the MMU. Before it can recover, a null pointer has been loaded into EBX. The kernel groans at my shit.
June 6, 2025 at 1:36 PM
A SIGTERM is issued by the operating system; my process effortlessly dodge rolls it, then immediately executes a perfect parry against the MMU. Before it can recover, a null pointer has been loaded into EBX. The kernel groans at my shit.
Reposted by AJR
[new blog post]
Analyzing Metastable Failures in Distributed Systems
muratbuffalo.blogspot.com/2025/06/anal...
Analyzing Metastable Failures in Distributed Systems
muratbuffalo.blogspot.com/2025/06/anal...
Analyzing Metastable Failures in Distributed Systems
So it goes: your system is purring like a tiger, devouring requests, until, without warning, it slumps into existential dread. Not a crash. ...
muratbuffalo.blogspot.com
June 5, 2025 at 5:59 PM
[new blog post]
Analyzing Metastable Failures in Distributed Systems
muratbuffalo.blogspot.com/2025/06/anal...
Analyzing Metastable Failures in Distributed Systems
muratbuffalo.blogspot.com/2025/06/anal...
Reposted by AJR
happy to finally announce it!
@cloudflare.social is now backing @pkg.pr.new's data infrastructure!
thank you so much everyone for supporting the tool and making this possible.
@cloudflare.social is now backing @pkg.pr.new's data infrastructure!
thank you so much everyone for supporting the tool and making this possible.
As we move into onboarding more OSS projects to @pkg.pr.new and are releasing the next million preview packages, we are thrilled to announce that @cloudflare.social is now backing our data infrastructure!
Cloudflare is now backing pkg.pr.new’s data infrastructure!
We are thrilled to announce that Cloudflare is backing pkg.pr.new’s data infrastructure, enabling us to sustainably scale preview package releases for the open source community and onboard even more p...
blog.stackblitz.com
June 5, 2025 at 7:51 AM
happy to finally announce it!
@cloudflare.social is now backing @pkg.pr.new's data infrastructure!
thank you so much everyone for supporting the tool and making this possible.
@cloudflare.social is now backing @pkg.pr.new's data infrastructure!
thank you so much everyone for supporting the tool and making this possible.
This is the one timeline where there may be future history books with a chapter on Roganomics.
June 5, 2025 at 11:31 PM
This is the one timeline where there may be future history books with a chapter on Roganomics.
Reposted by AJR
The agenda for Systems Distributed is out now!
Join us in Amsterdam for two days of talks, film references, and systems... distributed!
systemsdistributed.com/agenda
Join us in Amsterdam for two days of talks, film references, and systems... distributed!
systemsdistributed.com/agenda
May 1, 2025 at 1:02 PM
The agenda for Systems Distributed is out now!
Join us in Amsterdam for two days of talks, film references, and systems... distributed!
systemsdistributed.com/agenda
Join us in Amsterdam for two days of talks, film references, and systems... distributed!
systemsdistributed.com/agenda
Reposted by AJR
Sounds like a pretty good start to a cozy adventure. What do you think?
#indiegamedev #gamedev #gameaudio #videogamemusic
#indiegamedev #gamedev #gameaudio #videogamemusic
May 3, 2025 at 3:13 PM
Sounds like a pretty good start to a cozy adventure. What do you think?
#indiegamedev #gamedev #gameaudio #videogamemusic
#indiegamedev #gamedev #gameaudio #videogamemusic
Really interesting thread here. Stored procedures can move mountains, and there are definitely ways to make them feel nicer to use. But you're not going to have fun pitching them to your team.
Serious question:
Why do so many developers hate stored procedures?
Why do so many developers hate stored procedures?
April 30, 2025 at 10:45 AM
Really interesting thread here. Stored procedures can move mountains, and there are definitely ways to make them feel nicer to use. But you're not going to have fun pitching them to your team.
Reposted by AJR
New article out: "Cloudflare Durable Objects are Virtual Objects"🚀
This pops up a lot and is a mindset shift from the traditional way of thinking on "creating" and "destroying" resources, so I wrote a few thoughts how to think about it.
www.lambrospetrou.com/articles/dur...
#DurableObjects
This pops up a lot and is a mindset shift from the traditional way of thinking on "creating" and "destroying" resources, so I wrote a few thoughts how to think about it.
www.lambrospetrou.com/articles/dur...
#DurableObjects
Cloudflare Durable Objects are Virtual Objects | Lambros Petrou
How to think about Cloudflare Durable Objects as Virtual Objects and the mindset shift it brings.
www.lambrospetrou.com
April 27, 2025 at 4:18 PM
New article out: "Cloudflare Durable Objects are Virtual Objects"🚀
This pops up a lot and is a mindset shift from the traditional way of thinking on "creating" and "destroying" resources, so I wrote a few thoughts how to think about it.
www.lambrospetrou.com/articles/dur...
#DurableObjects
This pops up a lot and is a mindset shift from the traditional way of thinking on "creating" and "destroying" resources, so I wrote a few thoughts how to think about it.
www.lambrospetrou.com/articles/dur...
#DurableObjects
Reposted by AJR
Wow, that's an insanely cool website: animejs.com/
Anime.js | JavaScript Animation Engine
A fast and versatile JavaScript animation library
animejs.com
April 19, 2025 at 7:15 AM
Wow, that's an insanely cool website: animejs.com/
Reposted by AJR
Ended up writing my own little summary of the leakpocalypse in Rust
For the unfamiliar, this was an event near the release of Rust 1.0 that centered the question of whether leaking memory is safe.
At the time, std::mem::forget was marked unsafe, but it turned out you could write flavors of it with safe code anyway.
At the time, std::mem::forget was marked unsafe, but it turned out you could write flavors of it with safe code anyway.
April 16, 2025 at 9:38 PM
Ended up writing my own little summary of the leakpocalypse in Rust
Reposted by AJR
New blog post on the mental model I've used when working through complex or confusing papers on transactional systems.
transactional.blog/b...
transactional.blog/b...
April 17, 2025 at 6:36 PM
New blog post on the mental model I've used when working through complex or confusing papers on transactional systems.
transactional.blog/b...
transactional.blog/b...
I'm incredibly excited to announce that we're making Hyperdrive available on the Free Plan for Cloudflare Workers! To celebrate this, we put together a deep dive on how it all actually works under the hood. Come take a look, and give Hyperdrive a try!
blog.cloudflare.com/how-hyperdri...
blog.cloudflare.com/how-hyperdri...
Pools across the sea: how Hyperdrive speeds up access to databases and why we’re making it free
Hyperdrive, Cloudflare's global connection pooler, relies on some key innovations to make your database connections work. We go deep into the details of what that looks like, in celebration of announc...
blog.cloudflare.com
April 9, 2025 at 7:48 PM
I'm incredibly excited to announce that we're making Hyperdrive available on the Free Plan for Cloudflare Workers! To celebrate this, we put together a deep dive on how it all actually works under the hood. Come take a look, and give Hyperdrive a try!
blog.cloudflare.com/how-hyperdri...
blog.cloudflare.com/how-hyperdri...
Reposted by AJR
TIL in vim, "gx" opens the URL under your cursor in your default web browser! Also works with local file paths
March 15, 2025 at 11:02 AM
TIL in vim, "gx" opens the URL under your cursor in your default web browser! Also works with local file paths