Top all-time · #2063
Die wunderbare Welt von Isotopp
Personal blog · blog.koehntopp.infosystemsdata
Die wunderbare Welt von Isotopp is a personal blog at blog.koehntopp.info about systems and data. Since 2017, 38 different Hacker News readers have linked it 77 times, most often “Kristian Köhntopp explains utf8mb4 in MySQL”. It is still writing: the last post was on 2026-10-14, and you can follow it by feed.
Kris Köhntopp's blog (Fedi: @isotoppinfosec.exchange)
Most-linked posts?
- Kristian Köhntopp explains utf8mb4 in MySQL3 people · 8 mentions · first linked 2022-01-13
- 50 years in filesystems: 1974 – Die wunderbare Welt von Isotopp3 people · 3 mentions · first linked 2023-05-10
- 50 years in filesystems: towards 2004 – LFS3 people · 3 mentions · first linked 2023-05-23
- The Matrix Trashfire3 people · 3 mentions · first linked 2024-02-14
- How to Build a Cycling Environment2 people · 3 mentions · first linked 2020-02-25
- Operations Review Meeting2 people · 2 mentions · first linked 2024-07-02
- MySQL from Below2 people · 2 mentions · first linked 2021-03-01
- 50 Years in Filesystems: 19842 people · 2 mentions · first linked 2023-05-10
What Hacker News says?
> https://blog.koehntopp.info/2024/02/13/the-matrix-trashfire .... explains why Matrix is lacking market share It complains that cyberfurz.chat is a "server with profanity in the name". ...why?
Comment linking /2024/02/13/the-matrix-trashfire
on “Keep your phone number private with Signal usernames”Submitted How not to run a CA as a story · 561 points
HN discussionThe reason Signal is successful is because it at least somewhat reliably works, while Matrix is the worst of fiddleware. https://blog.koehntopp.info/2024/02/13/the-matrix-trashfire.... explains why Matrix is lacking market share, and I think Signal's decision to be aggressively closed is due to a justified fear of becoming that.
Comment linking /2024/02/13/the-matrix-trashfire.html
on “Keep your phone number private with Signal usernames”Submitted The Matrix Trashfire as a story · 308 points
HN discussionIt kind-of is "wired" to a "physical" representation, but in a different sense. https://blog.koehntopp.info/2022/01/12/utf8mb4.html#so-what-...
Comment linking /2022/01/12/utf8mb4.html
on “In MySQL, use “utf8mb4” instead of “utf8” (2016)”Submitted NVMe is not a hard disk as a story · 248 points
HN discussionAlso relevant about this: https://blog.koehntopp.info/2022/01/12/utf8mb4.html
Comment linking /2022/01/12/utf8mb4.html
on “In MySQL, use “utf8mb4” instead of “utf8” (2016)”Submitted Getting out of the cloud… as a story · 204 points
HN discussionIf you are not running a database at home, you have the database in a replication setup. That provides capacity, but also redundancy. Better redundancy than at the disk level - fewer resources are shared. https://blog.koehntopp.info/2021/03/24/a-lot-of-mysql.html Here is how we run our datatbases.
Comment linking /2021/03/24/a-lot-of-mysql.html
on “NVMe is not a hard disk”Submitted 50 Years in Filesystems: 1984 as a story · 198 points
HN discussionMy environment is not a home environment. It looks like this: https://blog.koehntopp.info/2021/03/24/a-lot-of-mysql.html
Comment linking /2021/03/24/a-lot-of-mysql.html
on “NVMe is not a hard disk”Submitted Illegal and undocumented instructions found in every major vendor CPU as a story · 130 points
HN discussionhttps://blog.koehntopp.info/2023/05/05/50-years-in-filesyste... https://blog.koehntopp.info/2023/05/06/50-years-in-filesyste... https://blog.koehntopp.info/2023/05/12/50-years-in-filesyste... https://blog.koehntopp.info/2023/05/15/50-years-in-filesyste... https://blog.koehntopp.info/2023/05/17/50-years-in-filesyste...
Comment linking /2023/05/17/50-years-in-filesystems-towards-2004-lfs.html
on “50 Years in Filesystems: 1984”Submitted Facebook at Work spamblocks some SQL queries as a story · 92 points
HN discussionhttps://blog.koehntopp.info/2023/05/15/50-years-in-filesyste... https://blog.koehntopp.info/2023/05/17/50-years-in-filesyste...
Comment linking /2023/05/17/50-years-in-filesystems-towards-2004-lfs.html
on “50 Years in Filesystems: 1984”Submitted Unicode is over and it dies over Emoji as a story · 73 points
HN discussionThere is a blog post that captures this feelings very well in my opinion: Not being federated and E2E as an advantage https://blog.koehntopp.info/2025/06/17/no-federation-no-e2e....
Comment linking /2025/06/17/no-federation-no-e2e.html
on “Upcoming coordinated security fix for all Matrix server implementations”Submitted Attack of the 50 foot Blockchain (2017) as a story · 49 points
HN discussion> Why we would we fund Matrix when XMPP and IRC already exists? A common sentiment I’ve come across, here and other corners of the internet, is dismay that more organizations have been adopting closed communication platforms such as Discord and Slack. These platforms (probably Discord more so) make it easier for online communities to be set up and offer relatively polished user experience compared to Matrix, IRC, or…
Comment linking /2024/02/13/the-matrix-trashfire.html
on “Open Source Infrastructure must be a publicly funded service”Submitted Not being federated and E2E as an advantage as a story · 22 points
HN discussionFor some long term perspective, I liked Kris' blog post "On cache problems, and what they mean for the future" ending with the following passage: "That challenges the fundamental abstraction of Unix, though, because in Unix everything is a file, which is a linear array of bytes, and is being accessed through a file handle. Now, with Optane persistent data may be no longer behind a file handle, but a special kind of…
Comment linking /index.php/1960-on-cache-problems-and-what-they-mean-for-the-future/
on “What if the Web was filesystem-accessible?”Submitted Uplift or a Process to Create Useful Usenet Newsgroups (2008) as a story · 11 points
HN discussionNot quite a "headfake" but indeed it is all about testing our response. This is called Lean Fascism: http://blog.koehntopp.info/index.php/255-lean-fascism/ - " Political positions are no longer backed by theory and no longer subject to political discourse and societal control. They are simply being implemented, sometimes even purposefully badly crafted, in order to measure societal reaction "
Comment linking /index.php/255-lean-fascism/
on “The Immigration Ban Is a Headfake, and We’re Falling for It”Submitted MySQL from Below as a story · 8 points
HN discussionThis series has been really informative regarding the history of filesystems - when each breakthrough occurred and the historical tradeoffs that were considered at each point. https://blog.koehntopp.info/2023/05/05/50-years-in-filesyste...
Comment linking /2023/05/05/50-years-in-filesystems-1974.html
on “Ask HN: What are some good resources for learning about low level disk/file IO?”Submitted Kristian Köhntopp explains utf8mb4 in MySQL as a story · 5 points
HN discussionThis appears to be the wrong URL. It takes you to the blog homepage; the actual post is https://blog.koehntopp.info/2022/06/20/mysql-breaking-replic...
Comment linking /2022/06/20/mysql-breaking-replication-with-algorithm-instant.html
on “Breaking MySQL Replication with Algorithm = Instant”Submitted Breaking MySQL Replication with Algorithm = Instant as a story · 4 points
HN discussionI don‘t know what happened, because I‘m 100% sure I posted the right URL. https://blog.koehntopp.info/2022/08/23/mysql-gipk.html Is the share Link I get from Twitters Webview.
Comment linking /2022/08/23/mysql-gipk.html
on “Some Rules for Primary Keys”Submitted Containers 101 as a story · 4 points
HN discussion
