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# Papers

* [Druid: A Real-time Analytical Data Store](http://static.druid.io/docs/druid.pdf) - Discusses the Druid architecture in detail.

* [The RADStack: Open Source Lambda Architecture for Interactive Analytics](http://static.druid.io/docs/radstack.pdf) - Discusses how Druid supports real-time and batch workflows.

# Presentations

* [Introduction to Druid](https://www.youtube.com/watch?v=hgmxVPx4vVw) - Discusses the motivations behind Druid and the architecture of the system.

* [Druid: Interactive Queries Meet Real-Time Data](https://www.youtube.com/watch?v=Dlqj34l2upk) - Discusses how real-time ingestion in Druid works and use cases at Netflix.

* [Not Exactly! Fast Queries via Approximation Algorithms](https://www.youtube.com/watch?v=Hpd3f_MLdXo) - Discusses how approximate algorithms work in Druid.

* [Real-time Analytics with Open Source Technologies](https://www.youtube.com/watch?v=kJMYVpnW_AQ) - Discusses Lambda architectures with Druid.

* [Stories from the Trenches - The Challenges of Building an Analytics Stack](https://www.youtube.com/watch?v=Sz4w75xRrYM) - Discusses features that were added to scale Druid.

* [Building Interactive Applications at Scale](https://www.youtube.com/watch?v=bZ3LqG3iHbM) - Discusses building applications on top of Druid.