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today we are going to share a new paper about druid

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Hi all today we are going to share a new paper about druid.

http://static.druid.io/docs/druid.pdf

It's related to the previous share about scuba. They are all column-oriented database storage. Like scuba, The Druid database also has an in-memory data storage strategy.

Highlights:

  1. Database module roles. (include Real-time node, Historical Nodes, Broker Nodes, Coordinator Nodes)
  2. A complex but very useful time window design for storage "segment" in memory.
  3. read data from Kafka and can be query in multiple hundred milliseconds after event happen.