Concordia University
2026 – present
MASc, Electrical and Computer Engineering —
Gina Cody School of Engineering and Computer Science
- Member of the DISCOS Lab (Distributed Computing and Systems).
Harunari "TKT" Takata
高田 晴成（たかた はるなり）
tkt0430@keio.jp
(+81) 080-6969-0203
Fujisawa, Kanagawa, Japan
Who I Am
I am a MASc student at Concordia University, Gina Cody School of Engineering and Computer Science, where I do research in the DISCOS Lab (Distributed Computing and Systems), focusing on distributed consensus algorithms and geo-replicated databases.
Before that, I was at Keio University, Faculty of Environment and Information Studies, where I studied Distributed Systems at the Data Platform Laboratory. I spent 2024–2025 on exchange at the University of Toronto's Faculty of Applied Science and Engineering, where I began working as a Research Assistant — work that led to a publication at ACM SIGMOD 2026.
Education
Keio University
Mar 2022 – Mar 2026
B.A., Faculty of Environment and Information Studies
- Dissertation: An re-implementation and analysis of Raft consensus algorithm
University of Toronto
Sep 2024 – Apr 2025
Exchange Program, Faculty of Applied Science and Engineering
Professional & Research Experience
Infrastructure Engineer
Jan 2026 – present
PLAID Inc. · Tokyo, Japan
- Contributing to Mila, a proprietary distributed OLAP engine optimized for high-concurrency real-time data processing.
- Optimized the storage engine by identifying and resolving bottlenecks through systematic stress testing, accelerating query execution speed by 1.6×.
Infrastructure Engineer
Jun 2025 – Dec 2025
Mirrativ Inc. · Tokyo, Japan
- Designed and developed an S3-compatible in-house object storage system.
- Built high-performance benchmarking tools for stress-testing storage backends, covering limit testing, mixed R/W workloads, and long-term durability assessments.
- Resolved port exhaustion and TIME_WAIT spikes during load testing by tuning
MaxIdleConnsPerHostin the internal reverse proxy. - Reduced disk I/O and memory consumption during multipart downloads by refactoring to stream data directly, eliminating temporary disk spooling.
- Prevented OOM errors under high concurrency by redesigning the in-memory cache with a dynamically adjustable eviction policy.
- Achieved 100% response reliability during benchmarks by fixing race conditions with proper mutual exclusion.
Research Assistant
May 2025 – present
University of Toronto · Toronto, Canada
- Implemented a full-set TPC-C benchmarking suite from scratch for evaluating distributed transaction performance.
- Identified a fatal execution error from improper CPU pinning that had prevented system initialization.
- Simulated geographically distributed networks via synthetic latency injection using Linux
tc. - Work accepted at ACM SIGMOD 2026.
Teaching Experience
Student Instructor
2022 – 2026
Keio University — Independently Designed and Taught Courses
- Fundamentals of Information Technology 1 — Taught core CS concepts (system architecture, internet protocols, cybersecurity) and mentored Python programming assignments.
- Fundamentals of Information Technology 2 — Supervised project-based game development in Python, evaluated student projects, and provided feedback on software design.
Publications
Yunhao Mao, Harunari Takata, Michail Bachras, Yuqiu Zhang, Shiquan Zhang, Gengrui Zhang
and Hans-Arno Jacobsen.
"Epoch-based Optimistic Concurrency Control in Geo-replicated Databases."
Proceedings of the ACM on Management of Data (SIGMOD), 2026.
Writing
Harunari Takata.
"ACM SIGMOD/PODS 2026 参加報告"
(A trip report on ACM SIGMOD/PODS 2026, Bengaluru, India).
DBSJ Newsletter, Vol. 19, No. 4, The Database Society of Japan, August 2026.
DBSJ Newsletter ↗
written in Japanese
Skills
Languages: Japanese (Native) · English (Proficient) · Chinese (Beginner)
Honors & Awards
Kobe Bussan Foundation Scholarship for Study Abroad
2025 · ¥1,850,000 — Competitive scholarship for students pursuing studies and research at international institutions.
Find Me Online
Things I Like
Basketball · Memes · Photography · Jamiroquai
How to Reach Me
Send me an email at tkthdev (at) gmail.com — I read everything sent there.
Photos
