



Princeton University
51.1K posts

@Princeton
The official account of Princeton University. In the Nation’s Service and the Service of Humanity.



















Huge congrats to Dr. Jianan Lu on defending her PhD thesis, "Domain-Aware Data Systems for Modern Analytics"! 🎓 Her thesis revisits a classic tension in systems design: the clean abstractions of strict layering vs. the performance wins of application-specific optimizations. Her answer is domain-aware co-design, demonstrated through two systems aimed squarely at today's analytics problems. Fusion rethinks query pushdown on erasure-coded object storage, exactly the setup powering modern lakehouses. Instead of fragmenting analytics files across storage nodes during coding, killing pushdown efficiency, it co-designs erasure coding and placement around formats like Parquet. This keeps computable units intact and enables fine-grained adaptive pushdown, significantly increasing query performance. Terminus targets graph-based vector search, a workhorse behind RAG and LLM retrieval. Today's indexes burn significant I/O even after the top-ranked results -- the ones that actually matter for RAG -- have already been found. Terminus models per-I/O utility with a rank-weighted function and stops once additional I/Os stop paying off, delivering substantially higher throughput with negligible impact on downstream accuracy. Fusion appeared at ASPLOS '25 and Terminus will be presented at MLSys '26. So proud of what Jianan has built. Next step: Microsoft Research, Asia. 🚀 @Princeton @PrincetonCS @MSFTResearch















