Alexander Reelsen's Avatar

Alexander Reelsen

@spinscale.bsky.social

Husband, dad, enjoys working distributed, likes distributed databases & search engines, the JVM, Basketball/Streetball fan, gulps coffee, lives in Emsdetten/Germany, occasionally blogs at https://spinscale.de

207 Followers  |  423 Following  |  367 Posts  |  Joined: 21.12.2024  |  1.7129

Latest posts by spinscale.bsky.social on Bluesky

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Achievement unlocked: Added a cover slide using a terminal with figlet to my no-slides #elasticon presentation showing ES|QL to look into three years of solar data.

A part of the demo has also been written down in a blog post. See spinscale.de/posts/2025-1...

07.11.2025 13:56 β€” πŸ‘ 0    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0

πŸ› οΈ If your team has issues to work through:

We do an exercise at offsites called Elephants, Tigers & Paper Tigers.
- Elephants are things that the group isn’t talking about but needs to
- Tigers are things threatening the team, risks
- Paper tigers are things that seem like risks, but aren’t

06.11.2025 13:29 β€” πŸ‘ 158    πŸ” 25    πŸ’¬ 8    πŸ“Œ 1
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Introducing Chronos-2: From univariate to universal forecasting In-context learning enables a model that can solve forecasting tasks with an arbitrary number of dimensions in a zero-shot manner.

Introducing Chronos-2: From univariate to universal forecasting

Reads like a major upgrade to the existing model.

05.11.2025 13:56 β€” πŸ‘ 0    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0
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Save the date and forge the future β€” Elastic{ON} 2025/2026 Join the Elasticsearch community at a city near you! Connect with experts, gain insights into the latest Elastic innovations, and level up your skills.

Munich friends! I'll be in Munich for ElasticON Munich on Thursday.

If you want to meet spontaneously on Wednesday noon/afternoon, let's have a coffee somewhere!

04.11.2025 13:56 β€” πŸ‘ 0    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0
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How We Saved $500,000 Per Year by Rolling Our Own β€œS3” At thousands of uploads/second, S3’s per-request fees dominated costs. We built N3, a Rust in-memory landing zone with S3 as overflow.

How We Saved $500,000 Per Year by Rolling Our Own β€œS3”

Interesting very specific video processing use-case, where adapting to the actual workflow made more sense economically than using existing AWS infrastructure.

03.11.2025 13:56 β€” πŸ‘ 0    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0
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Katakate - Docs Secure sandboxed compute for AI agents and workloads

Katakate - Secure sandboxed compute for AI agents and workloads

Self-hosted infra for lightweight VM sandboxes to safely execute untrusted code. Uses kata containers and firecracker (with jailer). Hadn't heard of kata containers before.

02.11.2025 13:56 β€” πŸ‘ 1    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0
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GitHub - ironcore-dev/FeOS: A Rust-based init system for Linux, specifically tailored for secure and efficient management of containers, VMs, and MicroVMs in clustered server and multi-tenant environments. A Rust-based init system for Linux, specifically tailored for secure and efficient management of containers, VMs, and MicroVMs in clustered server and multi-tenant environments. - ironcore-dev/FeOS

FeOS is a revolutionary init system for Linux, designed specifically for hypervisors and servers that run containers.

01.11.2025 13:56 β€” πŸ‘ 0    πŸ” 1    πŸ’¬ 0    πŸ“Œ 0
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GitHub - javelit/javelit: The simplest way to build data apps and webapps in Java. Inspired by Streamlit. The simplest way to build data apps and webapps in Java. Inspired by Streamlit. - javelit/javelit

Javelit is a Java lightning fast data app development framework, inspired by Streamlit

As a fan of streamlit and the way of prototyping small apps fast or having great demos, this sounds intriguing, and I'll test it as soon as I have a use-case.

31.10.2025 13:56 β€” πŸ‘ 1    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0

Probably a decade late, but I finally started setting up neovim with a bit more effort.

Using noise, telescope, checkmate for todos. Also added a gpg plugin, so that I encrypt files and share via dotfiles repo, while only being able to encrypt on personal systems.

Other plugin recommendations?

30.10.2025 13:56 β€” πŸ‘ 1    πŸ” 0    πŸ’¬ 1    πŸ“Œ 0
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Danube Messaging documentation Danube is a lightweight, cloud‑native messaging platform built in Rust. It delivers sub‑second dispatch with cloud economics by combining a Write‑Ahead Log (WAL) with object storage, so you get…

Danube: a lightweight, cloud‑native messaging/pub-sub platform built in Rust

Storing data in object storage, while using a WAL to keep latencies low. etcd is used for metadata storage. Uses Opendal to write to different object storages.

29.10.2025 13:56 β€” πŸ‘ 2    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0
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SierraDB: A Distributed Event Store Built in Rust | Ari Seyhun A purpose built event store database built in Rust

SierraDB: A Distributed Event Store Built in Rust

Uses the redis protocol for communication. Neat trick to not need to support any clients out of the box - or at least skip the connection handling part, while having custom commands.

28.10.2025 13:56 β€” πŸ‘ 1    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0
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Performance Improvements in JDK 25 Java is constantly evolving with ever increasing performance. JDK 25 comes with significant performance improvements compared to previous versions including scoped values, improved GCs, lots of…

Performance Improvements in JDK 25

TLDR; always upgrade, free performance and auto vectorization

27.10.2025 13:56 β€” πŸ‘ 3    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0
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The AI-collapse pre-mortem - Bert Hubert's writings An essential part of being able to say β€˜I told you so’ is in fact having told you so. Here goes. In April 2023, I wrote an article titled AI: Guaranteed to disrupt our economies. In this piece I also…

The AI-collapse pre-mortem

Interesting piece about splitting the hype from the underlying technology and the generation it is expanding in. "... a collapsing economic bubble is not a useful data point about where this technology will end up."

26.10.2025 13:56 β€” πŸ‘ 0    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0
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Sandbox SDK Run sandboxed code environments on Cloudflare's edge network

Cloudflare sandbox SDK

Couple of interesting features like code interpreter, allowing to run jupyter like snippets in a secure sandbox. Support for quickly doing git checkouts to support CI. Also allows for custom base docker images. Based on cloudflare containers

24.10.2025 12:56 β€” πŸ‘ 0    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0
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FOSDEM 2024 - Advances in Garage, the low-tech storage platform for geo-distributed clusters

They gave an interesting talk at FOSDEM last year: archive.fosdem.org/2024/schedul...

23.10.2025 13:22 β€” πŸ‘ 2    πŸ” 1    πŸ’¬ 0    πŸ“Œ 0
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The Garage team - An open-source distributed object storage service tailored for self-hosting An open-source distributed object storage service tailored for self-hosting

Garage - an open-source distributed object storage service tailored for self-hosting

S3 compatible data store, single binary, written in Rust, geo based replication, supposed to be faster than Minio. Not seen this so far, anyone running this in prod?

23.10.2025 12:56 β€” πŸ‘ 5    πŸ” 2    πŸ’¬ 3    πŸ“Œ 0
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GitHub - Canop/dysk: A linux utility to get information on filesystems, like df but better A linux utility to get information on filesystems, like df but better - Canop/dysk

dysk - A CLI utility to get information on filesystems, like df but better

Extending df: adds better formatting via table and colors to a CLI tool, looks instantly a lot more useful than df. Wish existing tools would not be considered 'finished' sometimes, but extended.

22.10.2025 12:56 β€” πŸ‘ 0    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0
CPU Cache-Friendly Data Structures in Go: 10x Speed with Same Algorithm False sharing killed our performance. Data-oriented design saved it. Learn cache lines and NUMA.

CPU Cache-Friendly Data Structures in Go: 10x Speed with Same Algorithm

Nice examples for Go how to write CPU friendly code by not thrashing cache lines.

skoredin.pro/blog/golang/...

21.10.2025 13:20 β€” πŸ‘ 0    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0

I used sea animals i.e. needlefish, orca, whaleshark… next iteration will be small sea animals I guess :-)

20.10.2025 18:52 β€” πŸ‘ 1    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0
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Why TigerBeetle is the most interesting database in the world | Amplify Partners This read goes behind the scenes of how TigerBeetle came to be, the incredibly novel software they’ve built, and all of the wacky, wonderful things that make them so special.

Why TigerBeetle is the most interesting database in the world

An article by an invested VC, but highly technical, with a lot of links to youtube talks and blog posts. Wondering if this is preparing for the series B here. Time will tell.

20.10.2025 12:56 β€” πŸ‘ 0    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0
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GitHub - kruseio/hygg: πŸ“š Simplifying the way you read. Minimalistic Vim-like TUI document reader. πŸ“š Simplifying the way you read. Minimalistic Vim-like TUI document reader. - kruseio/hygg

hygg - Minimalistic Vim-like TUI document reader

Uses pandoc for document conversion, and then puts a TUI around the output neatly formatted, allowing easy selection, with vim keybindings.

19.10.2025 12:56 β€” πŸ‘ 0    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0
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Meet Rio | Rio Terminal A modern terminal for the 21st century.

rioterm - a hardware-accelerated GPU terminal emulator focusing to run in desktops and browsers

Never heard of this one despite 5k github stars. Written in Rust just like wezterm, but also compiles to WASM (soon), and a focus on speed.

18.10.2025 12:56 β€” πŸ‘ 2    πŸ” 0    πŸ’¬ 1    πŸ“Œ 0
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Home - General Transit Feed Specification By subscribing, you agree to receive communications from MobilityData. You can unsubscribe at any time by clicking the link in the footer of our emails. For information about our privacy practices,…

TIL there is GTFS - The general transit feed specification

A specification for dynamic traffic data (delays, broken escalators, reroutes, everything around stations), in protobuf and heavily in production use - at least in Germany. You find realtime feeds, making it nice demo data.

17.10.2025 12:56 β€” πŸ‘ 0    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0
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GitHub - Basekick-Labs/arc: Time-series data warehouse built for speed. 2.01M records/sec on native deployment. DuckDB + Parquet + MinIO. AGPL-3.0 Time-series data warehouse built for speed. 2.01M records/sec on native deployment. DuckDB + Parquet + MinIO. AGPL-3.0 - Basekick-Labs/arc

arc - High-performance time-series data warehouse built on DuckDB, Parquet, and MinIO

Configurable durability, automatic file compaction, uses DuckDB for querying, minio for storage, polars or arrow for parquet writing depending on the sent data.

16.10.2025 12:56 β€” πŸ‘ 11    πŸ” 1    πŸ’¬ 0    πŸ“Œ 0
OpenZL OpenZL delivers high compression ratios while preserving high speed, a level of performance that is out of reach for generic compressors.

openzl - A novel data compression framework

By having custom codecs that allow to deal with the concrete features of your data openzl allows much higher compression ratios while still be fast on reading & writing.

15.10.2025 12:56 β€” πŸ‘ 0    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0
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Fundamental of Virtual Memory Fundamental of Virtual Memory

Fundamentals of Virtual Memory

Great post about memory features like paging, fragmentation, stack/heap allocation and more.

14.10.2025 12:56 β€” πŸ‘ 0    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0
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Vibing a Non-Trivial Ghostty Feature I recently shipped a non-trivial Ghostty feature (unobtrusive macOS automatic updates) that was largely developed with AI.

Vibing a Non-Trivial Ghostty Feature

Interesting post about using ampcode (that I didn't know yet) to code an unobtrusive update feature into ghostty. This is the kind of AI content I need, with all the drawbacks and advantages.

13.10.2025 12:56 β€” πŸ‘ 2    πŸ” 1    πŸ’¬ 0    πŸ“Œ 0
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GitHub - yokoffing/Betterfox: Firefox user.js for speed, privacy, and security. Turn off AI. Your favorite browser, but better. Firefox user.js for speed, privacy, and security. Turn off AI. Your favorite browser, but better. - yokoffing/Betterfox

Started with a post about a browser yesterday, let's keep going on sunday as well.

Betterfox is an opinionated preference list, for speed, privacy, and security and no AI. 9.2k stars on GitHub I only learned about it today.

12.10.2025 12:56 β€” πŸ‘ 2    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0
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IINA - The modern media player for macOS TheΒ modernΒ media player for macOS.

Iina - The modern media player for macOS

Based on mpv, with a plugin system allowing to write javascript, i.e. reacting on events. I remember I used a GUI no top of mpv years ago, but I don't remember the name.

11.10.2025 20:57 β€” πŸ‘ 0    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0
Glide an extensible and keyboard-focused web browser.

Browsers and new alternatives to certain use-cases seem to have be at a high at the moment. Today glide, a firefox extending browser, that focuses on developer friendliness by being endlessly extensible via typescript and working fully via keyboard commands.

11.10.2025 12:56 β€” πŸ‘ 2    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0

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