# Engineering Den: implementing a new query manager (demo)

DevFeed: [Engineering Den: implementing a new query manager (demo)](<https://devfeed.tech/articles/engineering-den-implementing-a-new-query-manager-demo-12697.md>)

Original publisher: [Read original article](<https://www.redpanda.com/blog/engineering-den-query-manager-implementation-demo>)

Author: Grzegorz Dudek

Published: 2026-01-27T00:00:00Z

Content type: article

Language: en

Sources: [Redpanda](<https://devfeed.tech/sources/redpanda.md>)

Topics: [Demo](<https://devfeed.tech/topics/demo.md>), [Query (disambiguation)](<https://devfeed.tech/topics/query.md>), [SQL](<https://devfeed.tech/topics/sql.md>), [Streaming](<https://devfeed.tech/topics/streaming.md>), [Testing](<https://devfeed.tech/topics/testing.md>), [debug](<https://devfeed.tech/topics/debug.md>)

Tags: [debug](<https://devfeed.tech/tags/debug.md>), [demo](<https://devfeed.tech/tags/demo.md>), [engineering](<https://devfeed.tech/tags/engineering.md>), [sql](<https://devfeed.tech/tags/sql.md>), [streaming](<https://devfeed.tech/tags/streaming.md>)

## AI overview

This Engineering Den article presents a demo of Redpanda's refactored query manager. It explains how a deterministic state machine improves query lifecycle management, scheduling, cancellation, restart behavior, cluster stability, logging, and debuggability at scale.

## Source excerpt

Clear state, predictable behavior, fewer surprises. That's what happened after we refactored our scheduler. Here's what we did and a demo comparing the old with the new.