"XAI just open sourced the X recommendation algorithm, and honestly, it felt like they massacred my boy. I scrolled down expecting to see language stats like the 2023 repo. You know the usual breakdown: Java, Scala, maybe some Python sprinkled in. Instead, there were only two languages listed. Rust and Python. That's it. Which immediately tells you this wasn't a refactor. This was a full rewrite."
"And not the kind where you rename packages and call it modernization. This was a rip it out and start over rewrite. And the thing that actually made me pause wasn't Rust showing up. It was what disappeared. I thought Rust was supposed to replace C and C++. Not Java. Not Scala. Those were supposed to be safe. JVM land. Battle tested. Enterprise approved. So why did XAI replace them? Luckily, we don't have to guess. We have both codebases."
XAI open sourced the X recommendation algorithm and published a codebase listing only Rust and Python. The repository indicates a complete rewrite instead of a refactor, replacing JVM languages such as Java and Scala rather than modernizing existing code. The migration to Rust surprised observers because Rust was expected to supplant C and C++ rather than Java and JVM ecosystems. The change removed previously present Java and Scala components, signaling a full replacement of enterprise JVM elements. Both the original and new codebases are available for direct comparison.
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