Zhao Song - Staff Engineer Database Kernel

Zhao Song

Staff Engineer Database Kernel

Stockholm, Sweden

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Summary

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Rockstar

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Top School

Zhao Song is a Staff Engineer specializing in database kernels with 11 years of experience building high-performance, production-grade systems for cloud and open-source ecosystems. He was a core developer of Alibaba Cloud’s PolarDB where his Blink-Tree optimization and redo-based multi-connection replication significantly boosted TPC-C performance and enabled global read-only clusters with sub-second replication. Previously he led architecture and core implementation of Pika/Pikiwidb and related libraries (Blackwidow, Pink), remaining the top committer on the Redis-compatible Pikiwidb project. Deep in database internals, Zhao is fluent in MySQL InnoDB/NDB, PostgreSQL, RocksDB, DuckDB, Redis and LevelDB, and routinely troubleshoots customer-facing incidents through on-call rotations. Now based in Stockholm and working at Hopsworks, he combines source-level expertise with distributed-systems theory to deliver pragmatic, scalable solutions. A detail-oriented problem solver, he often surfaces non-obvious gains by rethinking core data structures and replication mechanics rather than only tuning surface metrics.

11 years of coding experience

9 years of employment as a software developer

Master of Science - MS, Computer Science, Master of Science - MS, Computer Science at Jilin University

Github Skills (18)

c-language10

redis10

network-programming10

cprogramming-language10

data-structure9

application-framework9

app-framework9

thread9

backend9

data-structures9

network9

web-framework9

database8

database-administration8

databases8

Programming languages (2)

C++C

Github contributions (5)

OpenAtomFoundation/pikiwidb

Jul 2015 - Jan 2018

Pika is a Redis-Compatible database developed by Qihoo's infrastructure team.

Role in this project:

Back-end Developer

Contributions:14 releases, 428 commits, 41 PRs in 2 years 6 months

Contributions summary:Zhao's commits focused on implementing and modifying core database functionalities, notably within the `src/sds.cc`, `src/pika_cmdset.cc`, `src/pika_cmdget.cc`, and `src/pika_conn.cc` files. The code changes centered on adding, modifying, and improving the structure of command processing and the underlying dynamic strings library. The updates also included changes to the code structure for commands.

bigtablelmdbredisnosqlrocksdb

PikaLabs/pink

Dec 2015 - Nov 2017

A high performance network library

Role in this project:

Back-end Developer

Contributions:57 commits, 4 PRs, 52 pushes in 1 year 10 months

Contributions summary:Zhao primarily contributed to the development of the `pink` network library, focusing on implementing and improving the Redis protocol parsing capabilities. Their work included adding support for Redis multibulk operations and making the parsing more robust. Further contributions involved bug fixes related to Redis protocol parsing and memory management, and integrating various features like connection management and buffer handling. These changes enhanced the library's ability to process and handle network traffic efficiently.

network-performanceepoll-tcp-servernetworkingframeworkthread

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