Big data and public cloud share a natural affinity, but are not a perfect match. Wikibon estimates that worldwide big data revenue in the public cloud was $1.1B in 2015 and will grow to $21.8B by 2026 - or from 5% of all big data revenue in 2015 to 24% of all big data spending by 2026. Doers should explore public cloud options for their big data workloads because public cloud offers a simple way to scale up and down workloads running mostly using open source software.