While you can find reference materials and some older PDF versions on GitHub, the official and most up-to-date content is hosted on ByteByteGo, which serves as the digital version of Alex Xu's books. Key Topics in Volume 2
donnemartin/system-design-primer – it cross-references Xu’s frameworks.git clone command to pull down a summary repo, then convert it to PDF yourself using pandoc. This gives you a fresh PDF timestamped today (your own "upd").GitHub Updates
Chapter 3: Consistent Hashing
, Alex Xu's official materials are primarily available through his ByteByteGo platform. GitHub versions are often community-maintained roadmaps or notes rather than the full copyrighted book. system design interview alex xu volume 2 pdf github upd