Introduction

Druid is an efficient data query system that is used to aggregate and query a large amount of time-series data. Data can be ingested in real time and can be queried immediately after being ingested to the Druid. In addition, data is almost immutable. After a time-series event occurs and is ingested to Druid, an external system can query the event.

For more information about Druid, visit https://github.com/apache/druid.