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
The atomic ensemble time scale at the NIST Boulder campus has failed.
December 20, 2025 at 10:54 PM
The atomic ensemble time scale at the NIST Boulder campus has failed.
Reposted by AJR
Big improvement to frameworks on Cloudflare! You can now deploy most frameworks from the CLI with zero config. No adding adapters. No editing configs. No wrangler.toml! It's all done automatically. Experimental now, with 10 frameworks supported today.
developers.cloudflare.com/changelog/20...
developers.cloudflare.com/changelog/20...
December 16, 2025 at 3:50 PM
Big improvement to frameworks on Cloudflare! You can now deploy most frameworks from the CLI with zero config. No adding adapters. No editing configs. No wrangler.toml! It's all done automatically. Experimental now, with 10 frameworks supported today.
developers.cloudflare.com/changelog/20...
developers.cloudflare.com/changelog/20...
So uh. Do you think they warned Dropbox first? Imagine getting that email.
December 12, 2025 at 9:21 PM
So uh. Do you think they warned Dropbox first? Imagine getting that email.
As a systems guy who's not afraid to take a frontend ticket now and again, I'm aware that frontend is often more complex than "boxes and buttons and stylesheet". But like... this sort of thing just astounds me. A good reminder that my corner of programming doesn't have a monopoly on cool work.
📣 New article on @frontendmasters.com about a visual problem that bugged me for years: making a card that truly feels deep.
frontendmasters.com/blog/the-dee...
Would love your thoughts.
frontendmasters.com/blog/the-dee...
Would love your thoughts.
December 6, 2025 at 9:53 PM
As a systems guy who's not afraid to take a frontend ticket now and again, I'm aware that frontend is often more complex than "boxes and buttons and stylesheet". But like... this sort of thing just astounds me. A good reminder that my corner of programming doesn't have a monopoly on cool work.
Reposted by AJR
Do you like databases?
Do you want to hear two database professors rant about them?
Do you need one of those professors to have a Turing Award for databases?
If yes, then join Mike Stonebraker and I next Wed Dec 10 @ 1:00pm EST for database hot takes: www.dbos.dev/webcast-2025...
Do you want to hear two database professors rant about them?
Do you need one of those professors to have a Turing Award for databases?
If yes, then join Mike Stonebraker and I next Wed Dec 10 @ 1:00pm EST for database hot takes: www.dbos.dev/webcast-2025...
2025 in Review with Mike Stonebraker and Andy Pavlo
Webcast Dec 10: DBMS researchers Mike Stonebraker (MIT / DBOS) and Andy Pavlo (CMU) discuss which data and CS trends are heating up or cooling down heading into 2026.
www.dbos.dev
December 5, 2025 at 11:29 PM
Do you like databases?
Do you want to hear two database professors rant about them?
Do you need one of those professors to have a Turing Award for databases?
If yes, then join Mike Stonebraker and I next Wed Dec 10 @ 1:00pm EST for database hot takes: www.dbos.dev/webcast-2025...
Do you want to hear two database professors rant about them?
Do you need one of those professors to have a Turing Award for databases?
If yes, then join Mike Stonebraker and I next Wed Dec 10 @ 1:00pm EST for database hot takes: www.dbos.dev/webcast-2025...
Reposted by AJR
If you've ever used Rust, you've felt jyn's positive influence — even if you never realized it.
I hope my token of recognition is just the start of jyn's invaluable work getting the funding it deserves.
Folks, can we get jyn some more funding? RT 🙏
github.com/sponsors/jyn...
I hope my token of recognition is just the start of jyn's invaluable work getting the funding it deserves.
Folks, can we get jyn some more funding? RT 🙏
github.com/sponsors/jyn...
Sponsor @jyn514 on GitHub Sponsors
Support jyn's open source work on Rust, and their writing about a vision for the future of computers
github.com
November 30, 2025 at 3:51 PM
If you've ever used Rust, you've felt jyn's positive influence — even if you never realized it.
I hope my token of recognition is just the start of jyn's invaluable work getting the funding it deserves.
Folks, can we get jyn some more funding? RT 🙏
github.com/sponsors/jyn...
I hope my token of recognition is just the start of jyn's invaluable work getting the funding it deserves.
Folks, can we get jyn some more funding? RT 🙏
github.com/sponsors/jyn...
Reposted by AJR
I’ve compiled a survey of all the different strategies for torn writes (case #1) on transactional.blog/blog/2025-to... . A different set of 2&3’s durability discussion is covered on transactional.blog/how-to-learn... too.
November 29, 2025 at 11:53 PM
I’ve compiled a survey of all the different strategies for torn writes (case #1) on transactional.blog/blog/2025-to... . A different set of 2&3’s durability discussion is covered on transactional.blog/how-to-learn... too.
You ever cut a release and all of a sudden The Sorcerer's Apprentice starts playing like boss music?
November 23, 2025 at 2:12 PM
You ever cut a release and all of a sudden The Sorcerer's Apprentice starts playing like boss music?
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