Tsuyoshi Ozawa
Doctoral Student at The University of Tokyo
Tokyo, Japan
Summary
🤩
Rockstar🎓
Top SchoolTsuyoshi Ozawa is a Ph.D. student and long-time systems engineer specializing in database management and storage systems at the University of Tokyo, with 14 years of experience building and hardening large-scale distributed platforms. As an Apache Hadoop committer and PMC member since 2014, he has focused on stabilizing YARN, fixing resource-management and serialization bugs, and improving test reliability in one of the most widely used big data projects. He also contributes to msgpack-java, enhancing Java serialization performance and test coverage, reflecting deep expertise in backend Java systems and binary serialization. His background spans industry work at NTT and embedded/GUI programming early in his career, giving him practical breadth from low-level systems to production distributed services. Notably, he combines academic research with active open-source stewardship, bridging experimental ideas and production-grade implementations.
14 years of coding experience
16 years of employment as a software developer
Master, Computer Sciense, Master, Computer Sciense at University of Tsukuba
English, Japanese
Github Skills (19)
unit-testing10
apache-hadoop10
testing10
java10
javas10
yarn310
yarnpkg10
yarn-berry10
yarn210
messagepack10
debug9
debugging9
fileio9
file-access9
file-processing9
Programming languages (13)
Github contributions (5)
apache/hadoop
Dec 2014 - Sep 2016
Apache Hadoop
Role in this project:
Back-end Developer
Back-end DeveloperContributions:254 commits, 2 PRs, 9 comments in 1 year 9 months
Contributions summary:Tsuyoshi primarily contributed to bug fixes within the Apache Hadoop project. Their work involved resolving intermittent failures in test cases related to YARN and correcting file descriptor leaks. They also addressed issues related to resource management and serialization, demonstrating a focus on improving the stability and efficiency of the system. Furthermore, the user corrected log messages to ensure clarity.
apachebig-datasparkhadoopjava
msgpack/msgpack-java
Feb 2013 - Feb 2016
MessagePack serializer implementation for Java / msgpack.org[Java]
Role in this project:Back-end Developer & Test Automation Engineer
Back-end Developer & Test Automation EngineerContributions:36 commits, 2 PRs, 3 pushes in 2 years 11 months
Contributions summary:Tsuyoshi contributed to the `msgpack-java` repository by adding functionality, fixing bugs, and writing tests. They added a method to a template builder, fixed upper and lower bounds in an integer acceptance class, and improved tests related to immutable values. The user demonstrated proficiency in Java, specifically focused on the message pack serialization and deserialization library.
msgpackserializationmessagepackserializerjava
Find and Hire Top DevelopersWe’ve analyzed the programming source code of over 60 million software developers on GitHub and scored them by 50,000 skills. Sign-up on Prog,AI to search for software developers.