Apache Druid is a distributed, high-performance columnar store. Its official website is https://druid.io.
Druid allows us to store both real-time and historical data that is time series in nature. It also provides fast data aggregation and flexible data exploration. The architecture supports storing trillions of data points on petabyte sizes.
In order to understand more about the Druid architecture, please refer to this white paper at http://static.druid.io/docs/druid.pdf.
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