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I'm using Apache NiFi.

What is the proper way to load data from REST API to Druid?

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There are not any apache community based connectors for Druid yet but we really should make one soon. Hopefully someone will contribute one soon.

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You have 2 options:

  1. Option 1 A simple way to solve this it to first make NiFi dump the data into a Kafka Queue Then point Druid Realtime nodes to pull data out of the Kafka Queue to index data on realtime.
  2. Option 2 is to bring the data from NiFi to Storm cluster apply some transformation (eg Stream joins ..) if needed then use Tranquility to push data to Druid.

I am not an NiFi expert, but i think you will always need something like kafka to buffer events since i don't think NiFi does offer a buffering queue (again am not 100% sure about this claim).

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NiFi connections support a concept called "back pressure", which can limit execution by a data size/count threshold and propagate that information back along a flow, effectively buffering data until it is released.

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