"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."
XAI open sourced the X recommendation algorithm after a complete rewrite into Rust and Python. Repository language statistics show only Rust and Python, indicating a replacement rather than a refactor. Previous Java and Scala components were removed despite expectations that Rust would displace C and C++. JVM-based languages were previously considered stable, battle-tested, and enterprise-approved. The move signals a substantial architectural shift away from JVM land toward Rust and Python for core recommendation infrastructure. Both the original and rewritten codebases are available for direct comparison to understand design and implementation changes.
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