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Xiangpeng Hao

@xiangpeng.systems
1.1K followers 121 following 37 posts

Database/storage Flight/DataFusion/Arrow/Parquet PhD student@UW-Madison xiangpeng.systems

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Xiangpeng Hao @xiangpeng.systems · 08/06/2026
A system programmer’s guide to LLM inference, hope you like it! blog.xiangpeng.systems/posts/how-to...
blog.xiangpeng.systems
A system programmer’s guide to LLM inference – Xiangpeng’s blog
Let’s build a local LLM inference engine in Rust with no dependencies.
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Andrew Lamb @andrewlamb1111.bsky.social · 23/02/2026
Simply applying basic linting rules (like don't compress pages where it doesn't help) reduces parquet files sizes by 5% and decreases decode time by 20%. @xiangpeng.systems shows how in his latest blog blog.xiangpeng.systems/posts/parque...
blog.xiangpeng.systems
parquet-linter: A better Parquet is Parquet itself – Xiangpeng’s blog
Unleash the performance potential of your Parquet files
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Xiangpeng Hao @xiangpeng.systems · 02/02/2026
Stop building systems for agents, build systems for human. We need infrastructures to help us holding accountability of agent's code. blog.xiangpeng.systems/posts/stop-b...
blog.xiangpeng.systems
Stop building systems for agents – Xiangpeng’s blog
Build agent systems for human.
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Xiangpeng Hao @xiangpeng.systems · 29/01/2026
After two years since publication, Bf-Tree is finally open-sourced github.com/microsoft/bf... The GitHub repo just hit the Hacker News front page 🎉🎉🎉
github.com
GitHub - microsoft/bf-tree: Bf-Tree is a modern read-write-optimized concurrent larger-than-memory range index in Rust from MS Research.
Bf-Tree is a modern read-write-optimized concurrent larger-than-memory range index in Rust from MS Research. - microsoft/bf-tree
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Xiangpeng Hao @xiangpeng.systems · 03/12/2025
Mitchell is the creator of the github.com/mosure/bevy_... render-pipeline plugin for Bevy, and he’ll dive into real-time radiance-field rendering, GPU data layouts, kernels, profiling, and more.
github.com
GitHub - mosure/bevy_gaussian_splatting: bevy gaussian splatting render pipeline plugin
bevy gaussian splatting render pipeline plugin. Contribute to mosure/bevy_gaussian_splatting development by creating an account on GitHub.
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Xiangpeng Hao @xiangpeng.systems · 29/10/2025
Nice to see this getting shared! 🙌 Now I’m even more motivated to turn it into a full course.
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Xiangpeng Hao @xiangpeng.systems · 24/10/2025
Just like other big cities, Madison is getting its own systems talk series. Come join us!
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Xiangpeng Hao @xiangpeng.systems · 10/09/2025
LiquidCache a distributed pushdown cache for DataFusion, designed to cut down S3 requests for diskless databases. 💻 Code: github.com/XiangpengHao... 📄 Paper (VLDB 2026): github.com/XiangpengHao...
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Xiangpeng Hao @xiangpeng.systems · 16/05/2025
Join my PhD prelim talk next Monday: Data-Aware Caching for Cloud Analytics 🕐 May 19, 1PM CDT 📍 CS2310 or Zoom: uwmadison.zoom.us/j/3081128886
Data-Aware Caching for Cloud Analytics
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Andrew Lamb @andrewlamb1111.bsky.social · 04/04/2025
My manifesto on optimizing SQL and DataFrames in query engines (including an explanation of why Apache DataFusion doesn't have a complex join ordering algorithm): www.influxdata.com/blog/optimiz... www.influxdata.com/blog/optimiz...
influxdata.com
Optimizing SQL (and DataFrames) in DataFusion: Part 1
This post reviews what a Query Optimizer is, what it does, and why you need one for SQL and DataFrames. It also describes how industrial Query Optimizers are structured and standard optimization class...
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Xiangpeng Hao @xiangpeng.systems · 24/03/2025
New blog post: "Build your own S3-Select in 400 lines of Rust" Check it out 😉: blog.xiangpeng.systems/posts/build-...
blog.xiangpeng.systems
Build your own S3-Select in 400 lines of Rust – Xiangpeng’s blog
DataFusion is ALL YOU NEED
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Xiangpeng Hao @xiangpeng.systems · 13/03/2025
I submitted a PR that cuts average ClickBench latency by 15% for DataFusion! But reviewing it wasn't straightforward due to the nature of complex performance tuning dynamics, so I made a blog post to explain why it works -- check it out: blog.xiangpeng.systems/posts/parque...
blog.xiangpeng.systems
Efficient Filter Pushdown in Parquet – Xiangpeng’s blog
How to implement efficient filter pushdown in Parquet readers and why it’s challenging in practice.
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Ao Li @aoli.al · 12/03/2025
We are excited to share Fray Debugger (aoli.al/blogs/deadlo...), an IntelliJ plugin that allows you to control concurrent execution deterministically! We have translated the Deadlock Empire (deadlockempire.github.io) into Java to demonstrate how to use Fray Debugger.
aoli.al
Evil Scheduler: Mastering Concurrency Through Interactive Debugging – Ao Li
TLDR Watch the video below to see how Fray debugger works! I enjoy the concept of Deadlock Empire, an interactive game that teaches the semantics of locks and other concurrency primitives. The core id...
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Xuanwo @xuanwo.io · 10/03/2025
@xiangpeng.systems shared a great post about system researchers. I wrote a comment on it and would like to share some thoughts here and offer complementary ideas. In short: build paper with open source. xuanwo.io/links/2025/0...
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Xiangpeng Hao @xiangpeng.systems · 10/03/2025
Wrote a blog post reflecting my thoughts on DeepSeek, NSF funding and system research communities in general. Apologies for the bold claims -- hope they can invite some discussions. blog.xiangpeng.systems/posts/system...
blog.xiangpeng.systems
Where are we now, system researchers? – Xiangpeng’s blog
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Xiangpeng Hao @xiangpeng.systems · 22/02/2025
Checkout the underneath framework: github.com/cmu-pasta/fray Looking forward to a future Rust support😉
github.com
GitHub - cmu-pasta/fray: A controlled concurrency testing framework for the JVM
A controlled concurrency testing framework for the JVM - cmu-pasta/fray
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Xiangpeng Hao @xiangpeng.systems · 24/11/2024
My weekend project now comes with AI super power! Now you can explore Parquet data with natural language! parquet-viewer.haoxp.xyz
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Xiangpeng Hao @xiangpeng.systems · 21/11/2024
This is amazing -- an open source query engine build on open standard is now the fastest, and it is in Rust! datafusion.apache.org/blog/2024/11...
datafusion.apache.org
Apache DataFusion is now the fastest single node engine for querying Apache Parquet files
<!–
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Alex Miller @alexmillerdb.bsky.social · 20/11/2024
New blog post on the fun new hardware advancements which databases can leverage for great gains, and why the cloud means it doesn't matter that they exist. 🫠 transactional.blog/b...
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Alex Miller @alexmillerdb.bsky.social · 06/11/2024
My shoddy ASCII art about writing data to disk was surprisingly popular, so I finished off an old set of notes talking more comprehensively about durably writing data to disk and added a better version of the diagram. transactional.blog/h...
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Xiangpeng Hao @xiangpeng.systems · 04/11/2024
Checkout my weekend project on Parquet explorer: xiangpenghao.github.io/parquet-expl... It compiles Rust Parquet into WebAssembly, allowing you to explore the structure of Parquet files directly in your browser!
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Xiangpeng Hao @xiangpeng.systems · 28/10/2024
New blog post on caching in DataFusion! See how my research is advancing DataFusion’s capabilities and what’s next: blog.haoxp.xyz/posts/cachin...
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Xiangpeng Hao @xiangpeng.systems · 25/10/2024
DataFusion implements one of the most advanced Parquet readers🚀, checkout how: blog.haoxp.xyz/posts/parque...
How DataFusion prune Parquet files based on its metadata can query semantics
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