Druid is a high performance, real-time analytics database that delivers sub-second queries on streaming and batch data at scale and under load.
Although Druid incorporates architecture ideas from data warehouses such as column-oriented storage, Druid also incorporates designs from search systems and timeseries databases. Druid’s architecture is designed to handle many use cases that traditional data warehouses cannot.
This is free and open source software.
Features include:
- Interactive Query Engine – uses scatter/gather for high speed queries with data preloaded into memory or local storage to avoid data movement and network latency.
- Tiering & QoS – configurable tiering with quality of service enables the ideal price-performance for mixed workloads, guarantees priority, and avoids resource contention.
- Optimized Data Format – ingested data is automatically columnarized, time-indexed, dictionary-encoded, bitmap-indexed, and type-aware compressed
- Elastic Architecture – loosely coupled components for ingestion, queries, and orchestration combined with a deep storage layer enable easy & quick scale-up & scale-out.
- True Stream Ingestion – a connector-free integration with streaming platforms enables query-on-arrival, high scalability, low latency, and guaranteed consistency.
- Non-stop Reliability – automatic data services including continuous backup, automated recovery, and multi-node replication ensure high availability and durability.
- Schema Auto-Discovery – automatically detect, define, and update column names and data types upon ingestion, providing the ease of schemaless and the performance of strongly typed schemas.
- Flexible Joins Support – supports join operations during data ingestion and at query-time execution, with the fastest query performance when tables are pre-joined during ingestion.
- SQL Support – use the familiar SQL API for end-to-end data operations across ingestion, transformation, and querying.
Website: druid.apache.org
Support: GitHub Code Repository
Developer: Apache Software Foundation
License: Apache License 2.0
Druid is written in Java. Learn Java with our recommended free books and free tutorials.
| Popular series | |
|---|---|
 | The largest compilation of the best free and open source software in the universe. Each article is supplied with a legendary ratings chart helping you to make informed decisions. |
 | Hundreds of in-depth reviews offering our unbiased and expert opinion on software. We offer helpful and impartial information. |
 | The Big List of Active Linux Distros is a large compilation of actively developed Linux distributions. |
 | Replace proprietary software with open source alternatives: Google, Microsoft, Apple, Adobe, IBM, Autodesk, Oracle, Atlassian, Corel, Cisco, Intuit, and SAS. |
 | Awesome Free Linux Games Tools showcases a series of tools that making gaming on Linux a more pleasurable experience. This is a new series. |
 | Machine Learning explores practical applications of machine learning and deep learning from a Linux perspective. We've written reviews of more than 40 self-hosted apps. All are free and open source. |
 | New to Linux? Read our Linux for Starters series. We start right at the basics and teach you everything you need to know to get started with Linux. |
 | Alternatives to popular CLI tools showcases essential tools that are modern replacements for core Linux utilities. |
 | Essential Linux system tools focuses on small, indispensable utilities, useful for system administrators as well as regular users. |
 | Linux utilities to maximise your productivity. Small, indispensable tools, useful for anyone running a Linux machine. |
 | Surveys popular streaming services from a Linux perspective: Amazon Music Unlimited, Myuzi, Spotify, Deezer, Tidal. |
 | Saving Money with Linux looks at how you can reduce your energy bills running Linux. |
 | Home computers became commonplace in the 1980s. Emulate home computers including the Commodore 64, Amiga, Atari ST, ZX81, Amstrad CPC, and ZX Spectrum. |
 | Now and Then examines how promising open source software fared over the years. It can be a bumpy ride. |
 | Linux at Home looks at a range of home activities where Linux can play its part, making the most of our time at home, keeping active and engaged. |
 | Linux Candy reveals the lighter side of Linux. Have some fun and escape from the daily drudgery. |
 | Getting Started with Docker helps you master Docker, a set of platform as a service products that delivers software in packages called containers. |
 | Best Free Android Apps. We showcase free Android apps that are definitely worth downloading. There's a strict eligibility criteria for inclusion in this series. |
 | These best free books accelerate your learning of every programming language. Learn a new language today! |
 | These free tutorials offer the perfect tonic to our free programming books series. |
 | Linux Around The World showcases usergroups that are relevant to Linux enthusiasts. Great ways to meet up with fellow enthusiasts. |
 | Stars and Stripes is an occasional series looking at the impact of Linux in the USA. |