What is Apache Druid?
Druid is an open-source, column-oriented, distributed data store written in Java. It’s designed to quickly ingest massive quantities of event data, and provide low-latency queries on top of the data.
An analytics database designed for fast slice-and-dice analytics ( OLAP queries) on large data sets. Most often, Druid powers use cases where real-time ingestion, fast query performance, and high uptime are important.