Berlin Buzzwords 2025

Yingjun Wu

Yingjun Wu is the founder of RisingWave Labs (https://www.risingwave.com/), a database company developing RisingWave, a distributed SQL database for stream processing. Before running the company, Yingjun was a software engineer at the Redshift team, Amazon Web Services, and a researcher at the Database group, IBM Almaden Research Center. Yingjun received his PhD degree from National University of Singapore, and was a visiting PhD at Carnegie Mellon University. He has been working in the field of stream processing and database systems for over a decade.


Company/Organisation

RisingWave

Twitter

https://x.com/yingjunwu

LinkedIn

https://www.linkedin.com/in/yingjun-wu/


Session

06-16
11:10
40min
The Dark Secrets of Stream Processing
Yingjun Wu

Stream processing systems promise fresh results, strong consistency, and S3-based cost savings. But pitfalls exist:

  • Backfilling takes too long due to incremental state maintenance.
  • Consistency causes system stalls during joins.
  • S3 costs spike with cache misses.

This talk explores these issues, mitigations, and hard truths.

Frannz Salon