Aussie living in the San Francisco Bay Area.
Coding since 1998.
.NET Foundation member. C# fan
https://d.sb/
Mastodon: @[email protected]

  • 2 Posts
  • 284 Comments
Joined 1 year ago
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Cake day: June 14th, 2023

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  • I took down the home page of one of the top 5 websites for around 5 minutes.

    There were two existing functions that were written by a different team: An encode method that took a name of something (only used internally, never shown to the user) and returned a numeric identifier for it, and a decode method that did the opposite.

    Some existing code already used encode, but I had to use decode in my new code. Added the code, rolled it out to 80% of employees, and it seemed to work fine. Next day, I rolled it out to 5% public and it still seemed okay.

    Once I rolled it out to everyone, it all broke.

    Turns out that while the encode function used a static map built at build-time (and was thus just an O(1) lookup at runtime), decode connected to a database that was only ever designed for internal use. The DB only had ten replicas, which was nowhere near enough to handle hundreds of thousands of concurrent users.

    Luckily, it’s commonplace to use feature flags changes, which is how I could roll it out just to employees initially. The devops team were able to find stack traces of the error from the prod logs, find my code, find the commit that added it, find the name of the killswitch, and disable my code, before I even noticed that there was a problem. No code rollback needed.

    That was probably 7 years ago now. Thankfully I haven’t made any mistakes as large as that one again!

    Always use feature flags for major changes, especially if they’re risky!



  • I still don’t think that I’ve ever seen a 4k image or video

    Have you not watched a recent movie? Modern midrange to high-end TVs have been 4K for a while (eg my 2019 LG OLED is 4K) and it’s pretty common for movies to be released on 4K Blu-ray.

    Good 4K looks great. Not the low-bitrate streams from services like Netflix, but the 60Mbps+ streams from Blu-ray remuxes (for example, via Real Debrid or downloaded via usenet) or from Blu-ray disks themselves.

    You’ve definitely seen a 4K image. It’s equivalent to 8.3 megapixels, and good cameras have supported at least that resolution for a long time. Even the nearly 15-year-old Samsung Galaxy S2 had an 8MP camera.







  • Otherwise I feel like it’s a bit pointless to put so much work into a system that can’t be kept secure,

    You just need to recompile stuff when needed :D

    I think it’s designed mostly to be a learning experience rather than as a daily driver. It serves that role very well!


  • dan@upvote.autoLinux@lemmy.mlNiche Distro Users: Why?
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    27 days ago

    Kinda enjoying the process of piecing stuff

    At the risk of sounding crazy… You might enjoy Linux From Scratch (LFS) and Beyond Linux From Scratch (BLFS). Maybe not as a daily driver, but it’s a great way to learn how everything works, since (as the name suggests) you build everything from scratch. No package manager, just tarballs of source code. It really helps with getting an understanding of how everything works.

    BLFS even includes instructions for building Xorg and all the major desktop environments.