[fangjin]

Druid does pre-aggregation (roll-up) of data at ingestion time and is also used at scale (30+ trillion events, ingesting over 1M+ events/s) by numerous large technology companies: http://druid.io/druid-powered.html

[dsp1234]

Note that the commenter mentioned mid-2014. That page first appeared on (or about) July 29th, 2014[1], and at that time only contained 4 names:

Metamarkets

Netflix

LiquidM

N3twork

So while today Druid may be in use by "numerous large technology companies", at the time the commenter was researching it wasn't showcasing as many large companies.

[1] https://web.archive.org/web/20140729014707/http://druid.io/d...

[luckydata]

Hey Fan, I know you feel very strongly about Druid but at the time it wasn't the way to go, I can see how they might have opted to steer clear.