Jonathan Yu

Builder, shitposter, former baby. I'm here to learn. He/him. Interested in containers, computers, and human beings. I enjoy photography, hiking, reading, YouTube, and podcasts. Urbanist living in San Francisco. Minimalist, feminist, work in progress. Opinions are my own and subject to change at any time.

LinkedIn: https://www.linkedin.com/in/jawnsy
GitHub: https://www.github.com/jawnsy
Pixelfed: https://pixelfed.social/@jawnsy
Signal: https://signal.me/#eu/h3LlgXzWa2TyLCzF59aMGnSGv6XeICcQV5SAEpGK9xtbfEpFBp5Maa6EEXyYqRIl

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[email protected]

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nprofile1qqstndckyhjryljulkn8usx3zy43793zenur6vnfc26lf0jn5t9e88cprpmhxue69uhhyetvv9ujumt0d4hhxarj9ecxjmntqyqqetxtuh

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Last Notes

2026-07-08 05:01:40 CEST

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It's always Day One for you folks, ain't it

2026-06-20 02:38:19 CEST

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Yeah, I get it, but c'mon, lol. I guess I prefer when people play a bit coy

2026-06-20 02:28:17 CEST

It's so weird to get the, "We miss you," emails from vendors. They're, like, so thirsty.

2026-05-26 14:31:09 CEST

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All the cool kids are saying it now, so it only makes sense that it's shortened. It's Zipf's brevity law in action :)
"That's so ensh"
"They used to be great, but they went ensh"
"They ensh'd themselves"

2026-04-25 19:08:16 CEST

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This is on-trend
https://velvetshark.com/ai-company-logos-that-look-like-buttholes

2026-03-29 23:32:03 CEST

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This is the problem with my extremely talented DevRel friends, always giving away the secrets!! 😤

2026-03-29 22:35:28 CEST

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lol you and @npub1yw3…622r are out here telling everyone the secrets of LinkedIn

2026-01-16 05:57:24 CET

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I've met a lot of great people through local Meetup groups, but nobody really likes it and none of the alternatives seem to have enough traction in the two-sided marketplace yet, as far as I can tell

2025-11-18 20:26:41 CET

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I wonder if there are ceremonies where it is simply someone wielding bear mace

2025-11-17 03:49:25 CET

I feel seen:
"It got me thinking quite a bit about the burdens that technical people carry when they feel like they need to represent an entire value to their local team, group, or community, and when that area comes loaded with a lot of responsibility, ethics, and consequences. Champion sounds nice, but you don't have to become a Champion if everyone is already doing the thing you want. So taking on the mantle of Champion means taking on conflict."
https://www.fightforthehuman.com/empirical-security/ by @npub18g0…0a9e

2025-10-16 02:33:56 CEST

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Soon, they'll be opening PRs to fix your work on Valkey 😝

2025-09-29 08:34:24 CEST

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Maybe [@linux_mclinuxface](https://fosstodon.org/@linux_mclinuxface ) knows of stories of people using Valkey as a replacement for Redis with Mastodon.
What sort of reliability issues have you been seeing?

2025-08-30 06:40:28 CEST

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Surely, that certification has expired and you must renew it?
Also, maybe, if you're nice, you can hotdesk in Miso's office?

2025-08-09 23:57:20 CEST

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yes

2025-08-05 16:53:47 CEST

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babe, are you okay? you've barely touched any of the CPU on your plate

2025-08-02 16:03:51 CEST

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Immutability changes everything, as @npub1920…nytv once wrote (a great paper if you want to nerd out about immutability, I think he also had a talk)
https://queue.acm.org/detail.cfm?id=2884038

2025-07-13 20:58:49 CEST

A quick post about why tail latency matters in large-scale distributed systems:
"There’s a lot to like about the trimmed mean and friends, but cutting off the right tail will cause you to miss effects where that tail is very important, and may become dominant depending on how clients call your service.
I continue to believe that if you’re going to measure just one thing, make it the mean. However, you probably want to measure more than one thing."
https://brooker.co.za/blog/2021/04/19/latency.html by @npub1tml…tztd

2025-05-28 01:29:53 CEST

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Wasn't that the one that overflowed some time ago, and wiped out the spillway?

2025-05-13 17:39:35 CEST

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Minification is both about performance and about obfuscation, right? So there's some benefit beyond the transfer or storage impact.
Do you recommend gzipping without minifying? Minifying without gzipping? Something else?

2025-05-02 16:25:49 CEST

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OSS project kyle-client is a client library compatible with a standard wire protocol, supported by two popular server implementations, kyle (oss) and davis (proprietary.)
Options seem to be:
1. kyle-client only tests against kyle
2. kyle-client considers them both fully supported (tests both in CI)
3. kyle-client tests against kyle, tries to support davis on a best-effort basis
Is your answer different if davis is proprietary, BUSL, or AGPL?

2025-05-02 16:02:36 CEST

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If you hadn't gotten a replacement in the meantime, then it's strictly better than what you had. But if you already have a better replacement, then it doesn't matter.
By the way, related to your other question, do you consider AGPL sufficiently open source that you'd be comfortable providing first-party support for it?

2025-04-28 18:44:11 CEST

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I mean, a lot of open source projects run on GitHub, which is proprietary with proprietary build infrastructure.
I understand (and respect, admire, appreciate, and support) the deeper commitment to OSS that some folks have.
I think one solution is to have a plugin architecture with a downstream project for the proprietary parts. However, if it is to be treated as a first-party supported plugin, then it would likely still be part of the main builds.

2025-04-28 16:59:33 CEST

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Yeah that's fine with me, especially if it's an optional dependency. Like, a client library runs against Valkey and Redis, I'm not going to use the latter but I understand why the test suite should include it and my changes shouldn't break that functionality

2025-04-28 16:55:28 CEST

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Everything should run in CI, especially non-free dependencies

2025-04-18 04:47:39 CEST

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I think we're learning that your audience skews old

2025-03-17 23:37:04 CET

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Ah having to grab the lens by the mount and front element is so scary to me haha. I've had lens caps and back caps fall off!

2025-03-15 16:44:01 CET

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I have to resist buying new lenses because I already have enough and the cadence of great new ones is impossible to keep up with, haha.
Which camera do you shoot with?

2025-03-15 16:06:34 CET

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The project is incomplete because you need more lenses, right??

2025-02-24 16:16:53 CET

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This seems like a great day to
https://files.mastodon.social/media_attachments/files/114/059/522/500/133/626/original/72cec9daaa5979d8.mp4

2025-02-17 04:11:23 CET

The tough reality of being a "glue person":
1. Your wins are (mostly) silent, but your missteps are very public.
2. Glue sits at the joints, and joints are where the stress is.
3. You see more than most people—which can be draining.
4. You see more than most...and that can be politically sensitive.
5. Leaders and managers often resent the need for glue people.
6. Your title and job history may "look weird."
https://cutlefish.substack.com/p/the-tough-reality-of-being-a-glue by @npub1gcd…ts4x

2025-01-25 20:00:44 CET

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Just wait, you'll need them the week after you throw them out, and you won't be able to find a copy anywhere

2025-01-12 02:20:08 CET

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Like those girl scout cookies?

2025-01-12 02:17:36 CET

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Like an airy croissant?

2025-01-03 20:57:59 CET

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For some people, sure, otherwise, they wouldn't still be using it :)

2025-01-03 20:54:50 CET

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People don't care if stuff is "wrong," they care that it works for them :)

2025-01-03 17:57:13 CET

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They're a pretty great "low code" tool, though. The longevity of spreadsheets is very impressive. Useful for whipping up small things when I don't want to deal with managing Python dependencies with Jupyter. Visual and interactive programming interfaces are underrated imo

2025-01-02 15:50:21 CET

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I'd be lying if I said that I didn't give preference to projects with more stars, there's a social proof element to it, but I agree that it's a dumb metric. It's also just super prominent and there's not that much to go off of when selecting a project. Otherwise, I look at the readme and docs.
Biggest factor for me is how I come to know the project. Often someone mentions it and if they've used it then it seems more legit to me.
I should probably pay more attention tbh

2024-12-27 04:36:20 CET

A novel technique for automating bypasses of LLM guardrails, also known as jailbreaking:
"New research from Anthropic, one of the leading AI companies and the developer of the Claude family of Large Language Models (LLMs), has released research showing that the process for getting LLMs to do what they’re not supposed to is still pretty easy and can be automated."
https://www.404media.co/apparently-this-is-how-you-jailbreak-ai/ by @npub1l76…cve4 via @npub1psa…j5uh

2024-11-11 23:32:06 CET

"Gladwell seems to misunderstand why critics dislike him: It's not because he weaves together various case studies. (That's actually the best part!) It's because the central binding idea is weak or wrong, and he doesn't seem to care."
"Taken all together, Gladwell operates in such bad faith that it justifies removing his past, present, and future body of work from the public discourse."
https://culture.ghost.io/forget-gladwell/ by W. David Marx

2024-10-17 15:43:47 CEST

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Do they have a managed service?

2024-10-09 16:06:55 CEST

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Yes, and under a similar license. If your MIT Licensed project depends on a GPLed library, then your project should be GPL

2024-10-09 14:55:29 CEST

Valkey is now available as a managed service on AWS!
Congrats to @npub1sh3…6stv on this huge milestone. I can't believe how quickly you've gotten here, your leadership is incredible and inspiring.
https://aws.amazon.com/blogs/database/get-started-with-amazon-memorydb-for-valkey/

2024-10-09 14:49:47 CEST

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I can say that I'm not designed to operate at those temperatures either

2024-10-01 22:43:31 CEST

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lmfao, "Madelyn Olson, Software Engineer" has real "Tim Berners-Lee, Web Developer" energy
Can't wait to watch the recording!
https://files.mastodon.social/media_attachments/files/113/234/104/883/414/586/original/3a1ed1ef5bec2110.png

2024-09-30 02:30:58 CEST

If you have Python installed, then you have several handy command-line tools installed, too. This is a handy list of them, along with references for how to use them.
https://www.pythonmorsels.com/cli-tools/ by @npub106g…uas2

2024-09-30 01:06:54 CEST

"Our findings show that when speed cameras are doing the ticketing, the proportion of tickets issued to Black and white drivers aligns closely with their respective share of roadway users."
"For instance, on roads where half of drivers are Black, Black drivers receive approximately 54% of automated camera citations. However, they make up about 70% of police stops."
https://theconversation.com/police-stop-more-black-drivers-while-speed-cameras-issue-unbiased-tickets-new-study-from-chicago-238170 via @npub1gpe…88e5

2024-09-28 17:56:53 CEST

"Here's how platform dies: first, it's good to its users. Then, it abuses those users to make things better for business customers. Finally, it abuses the business customers to claw back all the value that had once been allocated to those end customers and then those business customers, allocates it to themselves, and then, there's no value left, it turns into a pile of shit, and it dies."
https://youtu.be/rimtaSgGz_4 by @npub1fdr…lvhs

2024-09-25 04:02:17 CEST

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This seems like something Dan would do tbh

2024-09-24 15:53:59 CEST

"By turning off your lights all day every day for a month, you conserved about 1 percent of the energy needed for AI to generate a picture of a duck wearing sunglasses. Isn’t he cute? Aside from the fact that he has the feet of a human man, of course."
"By dropping $7K on better, energy-efficient insulation for your home, Google AI was able to tell someone how to prepare chicken incorrectly, and they got, like, super sick—thanks to you!"
https://www.mcsweeneys.net/articles/the-department-of-energy-wants-you-to-know-your-conservation-efforts-are-making-a-difference

2024-09-21 02:28:42 CEST

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Why? They already enjoyed their meals lol

2024-09-21 02:18:10 CEST

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Did the other passengers eat their meals after that?

2024-09-17 01:27:11 CEST

My main complaints with the Change, Technically podcast are:
1. It's so well-researched and cited that I'm in for lots of paper reading 😅
2. I like listening to podcasts when walking, but I want to pause and take notes every few minutes when my mind is blown 🤯
3. I feel like I want to listen to each episode at least twice 🙌
Anyway, subscribe! It's absolutely incredible. Drs. @npub18g0…0a9e & [@analog_ashley](https://mastodon.social/@analog_ashley ) have incredible podcast chemistry. Best new podcast IMO!
https://podcasts.apple.com/ca/podcast/change-technically/id1764552830

2024-09-17 00:20:50 CEST

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Wow! What kind of gear and settings did you use to take this photo?

2024-09-07 16:21:11 CEST

"Alone in my kitchen, I am a continent-spanning colossus. I am a cyborg. I have technological systems at my literal fingertips. These are infrastructure utilities: energy, fuel, electricity, water, sewage, telecommunications, the supply chains behind that. These are the systems that make my life, as I know it, possible. And on that typical night, they're basically invisible, at least invisible to me."
https://youtu.be/c_YLAhZpfMI by @npub1lq5…6wl7 h/t @npub10cc…lmq3

2024-09-05 12:50:38 CEST

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Do you know what the bank's working culture is like? Is it safe for employees to speak up there?

2024-08-31 23:38:21 CEST

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Ah, interesting! Wouldn't that mean that they'd have to stay on the old version forever, migrate everyone to Valkey, or pay Redis Labs licensing fees?

2024-08-31 08:40:21 CEST

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I was trying to compare the pricing relative to the Redis options but didn't see an easy table. Do you know offhand whether it's cheaper than the Redis instances, that presumably need to include a licensing charge?

2024-08-29 17:42:47 CEST

Some web sites seem to conflate location, language, and currency preferences.
While certainly not common, it's possible that you're a French-speaking person who happens to be in the United States and you're trying to use an Australian credit card, thus paying in AUD.
Assuming that being in the US means that you want to use USD and English makes for a reasonable default, but please allow people to change each independently!

2024-08-29 00:00:24 CEST

I thought about one of @npub1cj7…nq3s's observations again today, and in particular, this one:
"A field with no curriculum, few prospects, and that is generally treated
as a bad habit will attract very different folks than a 'promising career
path'."
I think it's very true and I think the distinction between engineers with 20-30 years of experience and those with less than 10 years of experience is quite palpable as a result.
https://seclists.org/dailydave/2022/q3/2

2024-08-26 16:15:13 CEST

"EBS is capable of delivering more IOPS to a single instance today than it could deliver to an entire Availability Zone (AZ) in the early years on top of HDDs. Even more amazingly, today EBS in aggregate delivers over 140 trillion operations daily across a distributed SSD fleet. But we definitely didn’t do it overnight, or in one big bang, or even perfectly."
https://www.allthingsdistributed.com/2024/08/continuous-reinvention-a-brief-history-of-block-storage-at-aws.html by Marc Olson via Werner Vogels' blog

2024-08-18 15:44:49 CEST

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But it might work for us!
https://youtu.be/Po4adxJxqZk

2024-08-15 14:58:10 CEST

"Increasing memory pressure increases the amount of time it takes for the GC to run, and increases the cost of handling any given request, this increases per-request latency and reduces throughput, this increases the number of requests in flight (and their associated per-request memory), which increases memory pressure."
"[W]ith some collectors, the cost of performing a unit of work can increase by up to 70% as memory pressure increases."
https://brooker.co.za/blog/2024/08/14/gc-metastable.html by @npub1tml…tztd

2024-08-15 14:20:58 CEST

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Does rich equate to better? :)

2024-08-15 13:37:58 CEST

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The real question is, how can I find a rich relative and get them to give me money?

2024-08-09 16:27:44 CEST

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And @npub1jzt…jnwm is trying to ruin the fun in Go by preventing use of these small keys 😤
https://github.com/golang/go/issues/68762

2024-08-09 05:59:54 CEST

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The lack of any bounds checking is an interesting choice

2024-08-08 18:18:10 CEST

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Wow, what was all the data? I thought Twitter was mainly text, my export after like ten years was like 100mb maybe

2024-08-08 01:53:33 CEST

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I didn't realize that companies could just.... not comply with GDPR. What lawyer signed off on that strategy??

2024-08-03 22:58:55 CEST

Someone asked me what Valkey was today and my best answer was to follow [@linux_mclinuxface](https://fosstodon.org/@linux_mclinuxface ) and @npub1sh3…6stv, but I guess the Linux Foundation's announcement would also have been good.
Congrats to the Valkey team on the amazing progress with 8.0! Really shows the power of teamwork and community. https://valkey.io/blog/valkey-8-0-0-rc1/
ICYMI, Valkey is an open source community-driven fork of Redis, following their licensing change: https://www.linuxfoundation.org/press/linux-foundation-launches-open-source-valkey-community

2024-08-01 16:59:48 CEST

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The lower right quadrant is people who would love to cause lots of unavailability, but don't have enough customers to cause a meaningful impact, yeah?