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Show HN: DuckDB for Kafka Stream Processing

Hacker News (score: 27)
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Found: December 08, 2025
ID: 2612

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Database
Show HN: DuckDB for Kafka Stream Processing Hello Everyone! We built SQLFlow as a lightweight stream processing engine.

We leverage DuckDB as the stream processing engine, which gives SQLFlow the ability to process 10's of thousands of messages a second using ~250MiB of memory!

DuckDB also supports a rich ecosystem of sinks and connectors!

https://sql-flow.com/docs/category/tutorials/

https://github.com/turbolytics/sql-flow

We were tired of running JVM's for simple stream processing, and also of bespoke one off stream processors

I would love your feedback, criticisms and/or experiences!

Thank you

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