(1/2) On Thu at 10:45 CET (IEEE ICDE Conference), Jim Verhijde (w/ Marios Fragkoulis, Vassilios Karakoidas) will present how internal stream-processor state can be queried efficiently, and a stream processor with queryable state can replace caching/view layers in scalable data processing architectures.

(2/2) We use an example workload from Delivery Hero and efood. We deploying Hazelcast's IMDG+Jet, matching partitioning and making Jet's internal state fully queryable with SQL and different isolation levels. Paper: asterios.katsifodimos.com/assets/publica… Code: github.com/delftdata/s-qu…

The deadline for EDBT's second research paper submission cycle is approaching fast! Submit by 1 June cs.uoi.gr/~edbticdt2023/…

EDBT/ICDT 2023 Call for Tutorials is out! cs.uoi.gr/~edbticdt2023/…

Friday I presented the CWI DA Database Architectures group for siks.nl (presentation here: cwi.nl/~boncz/siks202…) on the day both @hfmuehleisen and Asterios Katsifodimos won the prestigious VIDI grant. A great day for data systems research in The Netherlands!

Don't miss EDBT23's call for demo papers! edbticdt2023.cs.uoi.gr/?contents=call…

Don't miss EDBT's final call for research papers! Due on 30 September cs.uoi.gr/~edbticdt2023/…

We are glad to announce that Marios Fragkoulis joined the team of our awesome speakers! Marios leads an international research team with the mission to leverage & advance state-of-the-art approaches for revolutionizing online food delivery in #Greeece! ▶️voxxeddays.com/athens/

EDBT 2023: Final call for research papers is due on 30 September!

Don't forget to submit to EDBT's PhD Workshop by October 14! cs.uoi.gr/~edbticdt2023/…

Don't miss EDBT's PhD workshop deadline: extended to 28 October!

Have you had a chance to read Delivery Hero Tech's latest Tech Blog article? 🤓 The article was written by Marios Fragkoulis, our Senior Research Manager 🚀 Read it here: bit.ly/3OTaXBx 🗞️ #Likeheroes #SQuery #Research

Took >3 years with Marios Fragkoulis, Paris Carbone & Vasia Kalavri to write a survey on the evolution of streaming systems in the last 20 years (VLDB 2025 🇬🇧 J.). Looking for a single point of reference for all things streaming systems research? It’s here: link.springer.com/article/10.100…

Please retweet! Searching for a PhD student for my VIDI grant. The team is building a programming model & self-driving streaming dataflow engine for Transactional Stateful Functions. Apply here by 10th February (and drop me an email): tudelft.nl/over-tu-delft/…

On Valentine’s day, all you need is pip 😍 Whether you found your match in life or not, Valentine matches your datasets. Feb. 14th anniversary-release (v0.2.0) includes: — faster batch-matching — more string similarity functions — redesigned metrics ++ github.com/delftdata/vale…

Never regret a day in your life. Good days give happiness, bad days give experiences, worst days give lessons, and best days give memories. —Professor Richard Feynman

It took three years to finish, but our follow-up to the 2006 "What Goes Around Comes Around" is finally out! Stonebraker and I examine the last 20 years in databases and discuss why relational databases + SQL will continue to remain on top. 📄PDF: db.cs.cmu.edu/papers/2024/wh…

We've been developing a runtime for Transactional Cloud Apps. Here is why we adopted (streaming) stateful dataflow graphs. "Transactional Cloud Applications Go with the (Data)Flow" K. Psarakis, G. Christodoulou, M. Fragkoulis, A. Katsifodimos. CIDR'25: kpsarakis.com/assets/pdf/sty…

The main work of my PhD, "Styx: Transactional Stateful Functions on Streaming Dataflows," co-authored by George Christodoulou, George Siachamis , Marios Fragkoulis , and Asterios Katsifodimos , got accepted in ACM SIGMOD/PODS ! 📄 Paper: arxiv.org/abs/2312.06893 📜 Code: github.com/delftdata/styx (1/3)